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Linux/sound/soc/soc-dapm.c

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  1 /*
  2  * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
  3  *
  4  * Copyright 2005 Wolfson Microelectronics PLC.
  5  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
  6  *
  7  *  This program is free software; you can redistribute  it and/or modify it
  8  *  under  the terms of  the GNU General  Public License as published by the
  9  *  Free Software Foundation;  either version 2 of the  License, or (at your
 10  *  option) any later version.
 11  *
 12  *  Features:
 13  *    o Changes power status of internal codec blocks depending on the
 14  *      dynamic configuration of codec internal audio paths and active
 15  *      DACs/ADCs.
 16  *    o Platform power domain - can support external components i.e. amps and
 17  *      mic/headphone insertion events.
 18  *    o Automatic Mic Bias support
 19  *    o Jack insertion power event initiation - e.g. hp insertion will enable
 20  *      sinks, dacs, etc
 21  *    o Delayed power down of audio subsystem to reduce pops between a quick
 22  *      device reopen.
 23  *
 24  */
 25 
 26 #include <linux/module.h>
 27 #include <linux/moduleparam.h>
 28 #include <linux/init.h>
 29 #include <linux/async.h>
 30 #include <linux/delay.h>
 31 #include <linux/pm.h>
 32 #include <linux/bitops.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/jiffies.h>
 35 #include <linux/debugfs.h>
 36 #include <linux/pm_runtime.h>
 37 #include <linux/regulator/consumer.h>
 38 #include <linux/pinctrl/consumer.h>
 39 #include <linux/clk.h>
 40 #include <linux/slab.h>
 41 #include <sound/core.h>
 42 #include <sound/pcm.h>
 43 #include <sound/pcm_params.h>
 44 #include <sound/soc.h>
 45 #include <sound/initval.h>
 46 
 47 #include <trace/events/asoc.h>
 48 
 49 #define DAPM_UPDATE_STAT(widget, val) widget->dapm->card->dapm_stats.val++;
 50 
 51 #define SND_SOC_DAPM_DIR_REVERSE(x) ((x == SND_SOC_DAPM_DIR_IN) ? \
 52         SND_SOC_DAPM_DIR_OUT : SND_SOC_DAPM_DIR_IN)
 53 
 54 #define snd_soc_dapm_for_each_direction(dir) \
 55         for ((dir) = SND_SOC_DAPM_DIR_IN; (dir) <= SND_SOC_DAPM_DIR_OUT; \
 56                 (dir)++)
 57 
 58 static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
 59         struct snd_soc_dapm_widget *wsource, struct snd_soc_dapm_widget *wsink,
 60         const char *control,
 61         int (*connected)(struct snd_soc_dapm_widget *source,
 62                          struct snd_soc_dapm_widget *sink));
 63 
 64 struct snd_soc_dapm_widget *
 65 snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
 66                          const struct snd_soc_dapm_widget *widget);
 67 
 68 struct snd_soc_dapm_widget *
 69 snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 70                          const struct snd_soc_dapm_widget *widget);
 71 
 72 /* dapm power sequences - make this per codec in the future */
 73 static int dapm_up_seq[] = {
 74         [snd_soc_dapm_pre] = 0,
 75         [snd_soc_dapm_regulator_supply] = 1,
 76         [snd_soc_dapm_pinctrl] = 1,
 77         [snd_soc_dapm_clock_supply] = 1,
 78         [snd_soc_dapm_supply] = 2,
 79         [snd_soc_dapm_micbias] = 3,
 80         [snd_soc_dapm_dai_link] = 2,
 81         [snd_soc_dapm_dai_in] = 4,
 82         [snd_soc_dapm_dai_out] = 4,
 83         [snd_soc_dapm_aif_in] = 4,
 84         [snd_soc_dapm_aif_out] = 4,
 85         [snd_soc_dapm_mic] = 5,
 86         [snd_soc_dapm_mux] = 6,
 87         [snd_soc_dapm_demux] = 6,
 88         [snd_soc_dapm_dac] = 7,
 89         [snd_soc_dapm_switch] = 8,
 90         [snd_soc_dapm_mixer] = 8,
 91         [snd_soc_dapm_mixer_named_ctl] = 8,
 92         [snd_soc_dapm_pga] = 9,
 93         [snd_soc_dapm_adc] = 10,
 94         [snd_soc_dapm_out_drv] = 11,
 95         [snd_soc_dapm_hp] = 11,
 96         [snd_soc_dapm_spk] = 11,
 97         [snd_soc_dapm_line] = 11,
 98         [snd_soc_dapm_kcontrol] = 12,
 99         [snd_soc_dapm_post] = 13,
100 };
101 
102 static int dapm_down_seq[] = {
103         [snd_soc_dapm_pre] = 0,
104         [snd_soc_dapm_kcontrol] = 1,
105         [snd_soc_dapm_adc] = 2,
106         [snd_soc_dapm_hp] = 3,
107         [snd_soc_dapm_spk] = 3,
108         [snd_soc_dapm_line] = 3,
109         [snd_soc_dapm_out_drv] = 3,
110         [snd_soc_dapm_pga] = 4,
111         [snd_soc_dapm_switch] = 5,
112         [snd_soc_dapm_mixer_named_ctl] = 5,
113         [snd_soc_dapm_mixer] = 5,
114         [snd_soc_dapm_dac] = 6,
115         [snd_soc_dapm_mic] = 7,
116         [snd_soc_dapm_micbias] = 8,
117         [snd_soc_dapm_mux] = 9,
118         [snd_soc_dapm_demux] = 9,
119         [snd_soc_dapm_aif_in] = 10,
120         [snd_soc_dapm_aif_out] = 10,
121         [snd_soc_dapm_dai_in] = 10,
122         [snd_soc_dapm_dai_out] = 10,
123         [snd_soc_dapm_dai_link] = 11,
124         [snd_soc_dapm_supply] = 12,
125         [snd_soc_dapm_clock_supply] = 13,
126         [snd_soc_dapm_pinctrl] = 13,
127         [snd_soc_dapm_regulator_supply] = 13,
128         [snd_soc_dapm_post] = 14,
129 };
130 
131 static void dapm_assert_locked(struct snd_soc_dapm_context *dapm)
132 {
133         if (dapm->card && dapm->card->instantiated)
134                 lockdep_assert_held(&dapm->card->dapm_mutex);
135 }
136 
137 static void pop_wait(u32 pop_time)
138 {
139         if (pop_time)
140                 schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
141 }
142 
143 static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
144 {
145         va_list args;
146         char *buf;
147 
148         if (!pop_time)
149                 return;
150 
151         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
152         if (buf == NULL)
153                 return;
154 
155         va_start(args, fmt);
156         vsnprintf(buf, PAGE_SIZE, fmt, args);
157         dev_info(dev, "%s", buf);
158         va_end(args);
159 
160         kfree(buf);
161 }
162 
163 static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
164 {
165         return !list_empty(&w->dirty);
166 }
167 
168 static void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
169 {
170         dapm_assert_locked(w->dapm);
171 
172         if (!dapm_dirty_widget(w)) {
173                 dev_vdbg(w->dapm->dev, "Marking %s dirty due to %s\n",
174                          w->name, reason);
175                 list_add_tail(&w->dirty, &w->dapm->card->dapm_dirty);
176         }
177 }
178 
179 /*
180  * Common implementation for dapm_widget_invalidate_input_paths() and
181  * dapm_widget_invalidate_output_paths(). The function is inlined since the
182  * combined size of the two specialized functions is only marginally larger then
183  * the size of the generic function and at the same time the fast path of the
184  * specialized functions is significantly smaller than the generic function.
185  */
186 static __always_inline void dapm_widget_invalidate_paths(
187         struct snd_soc_dapm_widget *w, enum snd_soc_dapm_direction dir)
188 {
189         enum snd_soc_dapm_direction rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
190         struct snd_soc_dapm_widget *node;
191         struct snd_soc_dapm_path *p;
192         LIST_HEAD(list);
193 
194         dapm_assert_locked(w->dapm);
195 
196         if (w->endpoints[dir] == -1)
197                 return;
198 
199         list_add_tail(&w->work_list, &list);
200         w->endpoints[dir] = -1;
201 
202         list_for_each_entry(w, &list, work_list) {
203                 snd_soc_dapm_widget_for_each_path(w, dir, p) {
204                         if (p->is_supply || p->weak || !p->connect)
205                                 continue;
206                         node = p->node[rdir];
207                         if (node->endpoints[dir] != -1) {
208                                 node->endpoints[dir] = -1;
209                                 list_add_tail(&node->work_list, &list);
210                         }
211                 }
212         }
213 }
214 
215 /*
216  * dapm_widget_invalidate_input_paths() - Invalidate the cached number of
217  *  input paths
218  * @w: The widget for which to invalidate the cached number of input paths
219  *
220  * Resets the cached number of inputs for the specified widget and all widgets
221  * that can be reached via outcoming paths from the widget.
222  *
223  * This function must be called if the number of output paths for a widget might
224  * have changed. E.g. if the source state of a widget changes or a path is added
225  * or activated with the widget as the sink.
226  */
227 static void dapm_widget_invalidate_input_paths(struct snd_soc_dapm_widget *w)
228 {
229         dapm_widget_invalidate_paths(w, SND_SOC_DAPM_DIR_IN);
230 }
231 
232 /*
233  * dapm_widget_invalidate_output_paths() - Invalidate the cached number of
234  *  output paths
235  * @w: The widget for which to invalidate the cached number of output paths
236  *
237  * Resets the cached number of outputs for the specified widget and all widgets
238  * that can be reached via incoming paths from the widget.
239  *
240  * This function must be called if the number of output paths for a widget might
241  * have changed. E.g. if the sink state of a widget changes or a path is added
242  * or activated with the widget as the source.
243  */
244 static void dapm_widget_invalidate_output_paths(struct snd_soc_dapm_widget *w)
245 {
246         dapm_widget_invalidate_paths(w, SND_SOC_DAPM_DIR_OUT);
247 }
248 
249 /*
250  * dapm_path_invalidate() - Invalidates the cached number of inputs and outputs
251  *  for the widgets connected to a path
252  * @p: The path to invalidate
253  *
254  * Resets the cached number of inputs for the sink of the path and the cached
255  * number of outputs for the source of the path.
256  *
257  * This function must be called when a path is added, removed or the connected
258  * state changes.
259  */
260 static void dapm_path_invalidate(struct snd_soc_dapm_path *p)
261 {
262         /*
263          * Weak paths or supply paths do not influence the number of input or
264          * output paths of their neighbors.
265          */
266         if (p->weak || p->is_supply)
267                 return;
268 
269         /*
270          * The number of connected endpoints is the sum of the number of
271          * connected endpoints of all neighbors. If a node with 0 connected
272          * endpoints is either connected or disconnected that sum won't change,
273          * so there is no need to re-check the path.
274          */
275         if (p->source->endpoints[SND_SOC_DAPM_DIR_IN] != 0)
276                 dapm_widget_invalidate_input_paths(p->sink);
277         if (p->sink->endpoints[SND_SOC_DAPM_DIR_OUT] != 0)
278                 dapm_widget_invalidate_output_paths(p->source);
279 }
280 
281 void dapm_mark_endpoints_dirty(struct snd_soc_card *card)
282 {
283         struct snd_soc_dapm_widget *w;
284 
285         mutex_lock(&card->dapm_mutex);
286 
287         list_for_each_entry(w, &card->widgets, list) {
288                 if (w->is_ep) {
289                         dapm_mark_dirty(w, "Rechecking endpoints");
290                         if (w->is_ep & SND_SOC_DAPM_EP_SINK)
291                                 dapm_widget_invalidate_output_paths(w);
292                         if (w->is_ep & SND_SOC_DAPM_EP_SOURCE)
293                                 dapm_widget_invalidate_input_paths(w);
294                 }
295         }
296 
297         mutex_unlock(&card->dapm_mutex);
298 }
299 EXPORT_SYMBOL_GPL(dapm_mark_endpoints_dirty);
300 
301 /* create a new dapm widget */
302 static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
303         const struct snd_soc_dapm_widget *_widget)
304 {
305         return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
306 }
307 
308 struct dapm_kcontrol_data {
309         unsigned int value;
310         struct snd_soc_dapm_widget *widget;
311         struct list_head paths;
312         struct snd_soc_dapm_widget_list *wlist;
313 };
314 
315 static int dapm_kcontrol_data_alloc(struct snd_soc_dapm_widget *widget,
316         struct snd_kcontrol *kcontrol, const char *ctrl_name)
317 {
318         struct dapm_kcontrol_data *data;
319         struct soc_mixer_control *mc;
320         struct soc_enum *e;
321         const char *name;
322         int ret;
323 
324         data = kzalloc(sizeof(*data), GFP_KERNEL);
325         if (!data)
326                 return -ENOMEM;
327 
328         INIT_LIST_HEAD(&data->paths);
329 
330         switch (widget->id) {
331         case snd_soc_dapm_switch:
332         case snd_soc_dapm_mixer:
333         case snd_soc_dapm_mixer_named_ctl:
334                 mc = (struct soc_mixer_control *)kcontrol->private_value;
335 
336                 if (mc->autodisable && snd_soc_volsw_is_stereo(mc))
337                         dev_warn(widget->dapm->dev,
338                                  "ASoC: Unsupported stereo autodisable control '%s'\n",
339                                  ctrl_name);
340 
341                 if (mc->autodisable) {
342                         struct snd_soc_dapm_widget template;
343 
344                         name = kasprintf(GFP_KERNEL, "%s %s", ctrl_name,
345                                          "Autodisable");
346                         if (!name) {
347                                 ret = -ENOMEM;
348                                 goto err_data;
349                         }
350 
351                         memset(&template, 0, sizeof(template));
352                         template.reg = mc->reg;
353                         template.mask = (1 << fls(mc->max)) - 1;
354                         template.shift = mc->shift;
355                         if (mc->invert)
356                                 template.off_val = mc->max;
357                         else
358                                 template.off_val = 0;
359                         template.on_val = template.off_val;
360                         template.id = snd_soc_dapm_kcontrol;
361                         template.name = name;
362 
363                         data->value = template.on_val;
364 
365                         data->widget =
366                                 snd_soc_dapm_new_control_unlocked(widget->dapm,
367                                 &template);
368                         kfree(name);
369                         if (IS_ERR(data->widget)) {
370                                 ret = PTR_ERR(data->widget);
371                                 goto err_data;
372                         }
373                         if (!data->widget) {
374                                 ret = -ENOMEM;
375                                 goto err_data;
376                         }
377                 }
378                 break;
379         case snd_soc_dapm_demux:
380         case snd_soc_dapm_mux:
381                 e = (struct soc_enum *)kcontrol->private_value;
382 
383                 if (e->autodisable) {
384                         struct snd_soc_dapm_widget template;
385 
386                         name = kasprintf(GFP_KERNEL, "%s %s", ctrl_name,
387                                          "Autodisable");
388                         if (!name) {
389                                 ret = -ENOMEM;
390                                 goto err_data;
391                         }
392 
393                         memset(&template, 0, sizeof(template));
394                         template.reg = e->reg;
395                         template.mask = e->mask << e->shift_l;
396                         template.shift = e->shift_l;
397                         template.off_val = snd_soc_enum_item_to_val(e, 0);
398                         template.on_val = template.off_val;
399                         template.id = snd_soc_dapm_kcontrol;
400                         template.name = name;
401 
402                         data->value = template.on_val;
403 
404                         data->widget = snd_soc_dapm_new_control_unlocked(
405                                                 widget->dapm, &template);
406                         kfree(name);
407                         if (IS_ERR(data->widget)) {
408                                 ret = PTR_ERR(data->widget);
409                                 goto err_data;
410                         }
411                         if (!data->widget) {
412                                 ret = -ENOMEM;
413                                 goto err_data;
414                         }
415 
416                         snd_soc_dapm_add_path(widget->dapm, data->widget,
417                                               widget, NULL, NULL);
418                 }
419                 break;
420         default:
421                 break;
422         }
423 
424         kcontrol->private_data = data;
425 
426         return 0;
427 
428 err_data:
429         kfree(data);
430         return ret;
431 }
432 
433 static void dapm_kcontrol_free(struct snd_kcontrol *kctl)
434 {
435         struct dapm_kcontrol_data *data = snd_kcontrol_chip(kctl);
436 
437         list_del(&data->paths);
438         kfree(data->wlist);
439         kfree(data);
440 }
441 
442 static struct snd_soc_dapm_widget_list *dapm_kcontrol_get_wlist(
443         const struct snd_kcontrol *kcontrol)
444 {
445         struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
446 
447         return data->wlist;
448 }
449 
450 static int dapm_kcontrol_add_widget(struct snd_kcontrol *kcontrol,
451         struct snd_soc_dapm_widget *widget)
452 {
453         struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
454         struct snd_soc_dapm_widget_list *new_wlist;
455         unsigned int n;
456 
457         if (data->wlist)
458                 n = data->wlist->num_widgets + 1;
459         else
460                 n = 1;
461 
462         new_wlist = krealloc(data->wlist,
463                         sizeof(*new_wlist) + sizeof(widget) * n, GFP_KERNEL);
464         if (!new_wlist)
465                 return -ENOMEM;
466 
467         new_wlist->widgets[n - 1] = widget;
468         new_wlist->num_widgets = n;
469 
470         data->wlist = new_wlist;
471 
472         return 0;
473 }
474 
475 static void dapm_kcontrol_add_path(const struct snd_kcontrol *kcontrol,
476         struct snd_soc_dapm_path *path)
477 {
478         struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
479 
480         list_add_tail(&path->list_kcontrol, &data->paths);
481 }
482 
483 static bool dapm_kcontrol_is_powered(const struct snd_kcontrol *kcontrol)
484 {
485         struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
486 
487         if (!data->widget)
488                 return true;
489 
490         return data->widget->power;
491 }
492 
493 static struct list_head *dapm_kcontrol_get_path_list(
494         const struct snd_kcontrol *kcontrol)
495 {
496         struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
497 
498         return &data->paths;
499 }
500 
501 #define dapm_kcontrol_for_each_path(path, kcontrol) \
502         list_for_each_entry(path, dapm_kcontrol_get_path_list(kcontrol), \
503                 list_kcontrol)
504 
505 unsigned int dapm_kcontrol_get_value(const struct snd_kcontrol *kcontrol)
506 {
507         struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
508 
509         return data->value;
510 }
511 EXPORT_SYMBOL_GPL(dapm_kcontrol_get_value);
512 
513 static bool dapm_kcontrol_set_value(const struct snd_kcontrol *kcontrol,
514         unsigned int value)
515 {
516         struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
517 
518         if (data->value == value)
519                 return false;
520 
521         if (data->widget)
522                 data->widget->on_val = value;
523 
524         data->value = value;
525 
526         return true;
527 }
528 
529 /**
530  * snd_soc_dapm_kcontrol_widget() - Returns the widget associated to a
531  *   kcontrol
532  * @kcontrol: The kcontrol
533  */
534 struct snd_soc_dapm_widget *snd_soc_dapm_kcontrol_widget(
535                                 struct snd_kcontrol *kcontrol)
536 {
537         return dapm_kcontrol_get_wlist(kcontrol)->widgets[0];
538 }
539 EXPORT_SYMBOL_GPL(snd_soc_dapm_kcontrol_widget);
540 
541 /**
542  * snd_soc_dapm_kcontrol_dapm() - Returns the dapm context associated to a
543  *  kcontrol
544  * @kcontrol: The kcontrol
545  *
546  * Note: This function must only be used on kcontrols that are known to have
547  * been registered for a CODEC. Otherwise the behaviour is undefined.
548  */
549 struct snd_soc_dapm_context *snd_soc_dapm_kcontrol_dapm(
550         struct snd_kcontrol *kcontrol)
551 {
552         return dapm_kcontrol_get_wlist(kcontrol)->widgets[0]->dapm;
553 }
554 EXPORT_SYMBOL_GPL(snd_soc_dapm_kcontrol_dapm);
555 
556 static void dapm_reset(struct snd_soc_card *card)
557 {
558         struct snd_soc_dapm_widget *w;
559 
560         lockdep_assert_held(&card->dapm_mutex);
561 
562         memset(&card->dapm_stats, 0, sizeof(card->dapm_stats));
563 
564         list_for_each_entry(w, &card->widgets, list) {
565                 w->new_power = w->power;
566                 w->power_checked = false;
567         }
568 }
569 
570 static const char *soc_dapm_prefix(struct snd_soc_dapm_context *dapm)
571 {
572         if (!dapm->component)
573                 return NULL;
574         return dapm->component->name_prefix;
575 }
576 
577 static int soc_dapm_read(struct snd_soc_dapm_context *dapm, int reg,
578         unsigned int *value)
579 {
580         if (!dapm->component)
581                 return -EIO;
582         return snd_soc_component_read(dapm->component, reg, value);
583 }
584 
585 static int soc_dapm_update_bits(struct snd_soc_dapm_context *dapm,
586         int reg, unsigned int mask, unsigned int value)
587 {
588         if (!dapm->component)
589                 return -EIO;
590         return snd_soc_component_update_bits(dapm->component, reg,
591                                              mask, value);
592 }
593 
594 static int soc_dapm_test_bits(struct snd_soc_dapm_context *dapm,
595         int reg, unsigned int mask, unsigned int value)
596 {
597         if (!dapm->component)
598                 return -EIO;
599         return snd_soc_component_test_bits(dapm->component, reg, mask, value);
600 }
601 
602 static void soc_dapm_async_complete(struct snd_soc_dapm_context *dapm)
603 {
604         if (dapm->component)
605                 snd_soc_component_async_complete(dapm->component);
606 }
607 
608 static struct snd_soc_dapm_widget *
609 dapm_wcache_lookup(struct snd_soc_dapm_wcache *wcache, const char *name)
610 {
611         struct snd_soc_dapm_widget *w = wcache->widget;
612         struct list_head *wlist;
613         const int depth = 2;
614         int i = 0;
615 
616         if (w) {
617                 wlist = &w->dapm->card->widgets;
618 
619                 list_for_each_entry_from(w, wlist, list) {
620                         if (!strcmp(name, w->name))
621                                 return w;
622 
623                         if (++i == depth)
624                                 break;
625                 }
626         }
627 
628         return NULL;
629 }
630 
631 static inline void dapm_wcache_update(struct snd_soc_dapm_wcache *wcache,
632                                       struct snd_soc_dapm_widget *w)
633 {
634         wcache->widget = w;
635 }
636 
637 /**
638  * snd_soc_dapm_force_bias_level() - Sets the DAPM bias level
639  * @dapm: The DAPM context for which to set the level
640  * @level: The level to set
641  *
642  * Forces the DAPM bias level to a specific state. It will call the bias level
643  * callback of DAPM context with the specified level. This will even happen if
644  * the context is already at the same level. Furthermore it will not go through
645  * the normal bias level sequencing, meaning any intermediate states between the
646  * current and the target state will not be entered.
647  *
648  * Note that the change in bias level is only temporary and the next time
649  * snd_soc_dapm_sync() is called the state will be set to the level as
650  * determined by the DAPM core. The function is mainly intended to be used to
651  * used during probe or resume from suspend to power up the device so
652  * initialization can be done, before the DAPM core takes over.
653  */
654 int snd_soc_dapm_force_bias_level(struct snd_soc_dapm_context *dapm,
655         enum snd_soc_bias_level level)
656 {
657         int ret = 0;
658 
659         if (dapm->set_bias_level)
660                 ret = dapm->set_bias_level(dapm, level);
661 
662         if (ret == 0)
663                 dapm->bias_level = level;
664 
665         return ret;
666 }
667 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_bias_level);
668 
669 /**
670  * snd_soc_dapm_set_bias_level - set the bias level for the system
671  * @dapm: DAPM context
672  * @level: level to configure
673  *
674  * Configure the bias (power) levels for the SoC audio device.
675  *
676  * Returns 0 for success else error.
677  */
678 static int snd_soc_dapm_set_bias_level(struct snd_soc_dapm_context *dapm,
679                                        enum snd_soc_bias_level level)
680 {
681         struct snd_soc_card *card = dapm->card;
682         int ret = 0;
683 
684         trace_snd_soc_bias_level_start(card, level);
685 
686         if (card && card->set_bias_level)
687                 ret = card->set_bias_level(card, dapm, level);
688         if (ret != 0)
689                 goto out;
690 
691         if (!card || dapm != &card->dapm)
692                 ret = snd_soc_dapm_force_bias_level(dapm, level);
693 
694         if (ret != 0)
695                 goto out;
696 
697         if (card && card->set_bias_level_post)
698                 ret = card->set_bias_level_post(card, dapm, level);
699 out:
700         trace_snd_soc_bias_level_done(card, level);
701 
702         return ret;
703 }
704 
705 /* connect mux widget to its interconnecting audio paths */
706 static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
707         struct snd_soc_dapm_path *path, const char *control_name,
708         struct snd_soc_dapm_widget *w)
709 {
710         const struct snd_kcontrol_new *kcontrol = &w->kcontrol_news[0];
711         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
712         unsigned int val, item;
713         int i;
714 
715         if (e->reg != SND_SOC_NOPM) {
716                 soc_dapm_read(dapm, e->reg, &val);
717                 val = (val >> e->shift_l) & e->mask;
718                 item = snd_soc_enum_val_to_item(e, val);
719         } else {
720                 /* since a virtual mux has no backing registers to
721                  * decide which path to connect, it will try to match
722                  * with the first enumeration.  This is to ensure
723                  * that the default mux choice (the first) will be
724                  * correctly powered up during initialization.
725                  */
726                 item = 0;
727         }
728 
729         i = match_string(e->texts, e->items, control_name);
730         if (i < 0)
731                 return -ENODEV;
732 
733         path->name = e->texts[i];
734         path->connect = (i == item);
735         return 0;
736 
737 }
738 
739 /* set up initial codec paths */
740 static void dapm_set_mixer_path_status(struct snd_soc_dapm_path *p, int i,
741                                        int nth_path)
742 {
743         struct soc_mixer_control *mc = (struct soc_mixer_control *)
744                 p->sink->kcontrol_news[i].private_value;
745         unsigned int reg = mc->reg;
746         unsigned int shift = mc->shift;
747         unsigned int max = mc->max;
748         unsigned int mask = (1 << fls(max)) - 1;
749         unsigned int invert = mc->invert;
750         unsigned int val;
751 
752         if (reg != SND_SOC_NOPM) {
753                 soc_dapm_read(p->sink->dapm, reg, &val);
754                 /*
755                  * The nth_path argument allows this function to know
756                  * which path of a kcontrol it is setting the initial
757                  * status for. Ideally this would support any number
758                  * of paths and channels. But since kcontrols only come
759                  * in mono and stereo variants, we are limited to 2
760                  * channels.
761                  *
762                  * The following code assumes for stereo controls the
763                  * first path is the left channel, and all remaining
764                  * paths are the right channel.
765                  */
766                 if (snd_soc_volsw_is_stereo(mc) && nth_path > 0) {
767                         if (reg != mc->rreg)
768                                 soc_dapm_read(p->sink->dapm, mc->rreg, &val);
769                         val = (val >> mc->rshift) & mask;
770                 } else {
771                         val = (val >> shift) & mask;
772                 }
773                 if (invert)
774                         val = max - val;
775                 p->connect = !!val;
776         } else {
777                 p->connect = 0;
778         }
779 }
780 
781 /* connect mixer widget to its interconnecting audio paths */
782 static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
783         struct snd_soc_dapm_path *path, const char *control_name)
784 {
785         int i, nth_path = 0;
786 
787         /* search for mixer kcontrol */
788         for (i = 0; i < path->sink->num_kcontrols; i++) {
789                 if (!strcmp(control_name, path->sink->kcontrol_news[i].name)) {
790                         path->name = path->sink->kcontrol_news[i].name;
791                         dapm_set_mixer_path_status(path, i, nth_path++);
792                         return 0;
793                 }
794         }
795         return -ENODEV;
796 }
797 
798 static int dapm_is_shared_kcontrol(struct snd_soc_dapm_context *dapm,
799         struct snd_soc_dapm_widget *kcontrolw,
800         const struct snd_kcontrol_new *kcontrol_new,
801         struct snd_kcontrol **kcontrol)
802 {
803         struct snd_soc_dapm_widget *w;
804         int i;
805 
806         *kcontrol = NULL;
807 
808         list_for_each_entry(w, &dapm->card->widgets, list) {
809                 if (w == kcontrolw || w->dapm != kcontrolw->dapm)
810                         continue;
811                 for (i = 0; i < w->num_kcontrols; i++) {
812                         if (&w->kcontrol_news[i] == kcontrol_new) {
813                                 if (w->kcontrols)
814                                         *kcontrol = w->kcontrols[i];
815                                 return 1;
816                         }
817                 }
818         }
819 
820         return 0;
821 }
822 
823 /*
824  * Determine if a kcontrol is shared. If it is, look it up. If it isn't,
825  * create it. Either way, add the widget into the control's widget list
826  */
827 static int dapm_create_or_share_kcontrol(struct snd_soc_dapm_widget *w,
828         int kci)
829 {
830         struct snd_soc_dapm_context *dapm = w->dapm;
831         struct snd_card *card = dapm->card->snd_card;
832         const char *prefix;
833         size_t prefix_len;
834         int shared;
835         struct snd_kcontrol *kcontrol;
836         bool wname_in_long_name, kcname_in_long_name;
837         char *long_name = NULL;
838         const char *name;
839         int ret = 0;
840 
841         prefix = soc_dapm_prefix(dapm);
842         if (prefix)
843                 prefix_len = strlen(prefix) + 1;
844         else
845                 prefix_len = 0;
846 
847         shared = dapm_is_shared_kcontrol(dapm, w, &w->kcontrol_news[kci],
848                                          &kcontrol);
849 
850         if (!kcontrol) {
851                 if (shared) {
852                         wname_in_long_name = false;
853                         kcname_in_long_name = true;
854                 } else {
855                         switch (w->id) {
856                         case snd_soc_dapm_switch:
857                         case snd_soc_dapm_mixer:
858                         case snd_soc_dapm_pga:
859                         case snd_soc_dapm_out_drv:
860                                 wname_in_long_name = true;
861                                 kcname_in_long_name = true;
862                                 break;
863                         case snd_soc_dapm_mixer_named_ctl:
864                                 wname_in_long_name = false;
865                                 kcname_in_long_name = true;
866                                 break;
867                         case snd_soc_dapm_demux:
868                         case snd_soc_dapm_mux:
869                                 wname_in_long_name = true;
870                                 kcname_in_long_name = false;
871                                 break;
872                         default:
873                                 return -EINVAL;
874                         }
875                 }
876 
877                 if (wname_in_long_name && kcname_in_long_name) {
878                         /*
879                          * The control will get a prefix from the control
880                          * creation process but we're also using the same
881                          * prefix for widgets so cut the prefix off the
882                          * front of the widget name.
883                          */
884                         long_name = kasprintf(GFP_KERNEL, "%s %s",
885                                  w->name + prefix_len,
886                                  w->kcontrol_news[kci].name);
887                         if (long_name == NULL)
888                                 return -ENOMEM;
889 
890                         name = long_name;
891                 } else if (wname_in_long_name) {
892                         long_name = NULL;
893                         name = w->name + prefix_len;
894                 } else {
895                         long_name = NULL;
896                         name = w->kcontrol_news[kci].name;
897                 }
898 
899                 kcontrol = snd_soc_cnew(&w->kcontrol_news[kci], NULL, name,
900                                         prefix);
901                 if (!kcontrol) {
902                         ret = -ENOMEM;
903                         goto exit_free;
904                 }
905 
906                 kcontrol->private_free = dapm_kcontrol_free;
907 
908                 ret = dapm_kcontrol_data_alloc(w, kcontrol, name);
909                 if (ret) {
910                         snd_ctl_free_one(kcontrol);
911                         goto exit_free;
912                 }
913 
914                 ret = snd_ctl_add(card, kcontrol);
915                 if (ret < 0) {
916                         dev_err(dapm->dev,
917                                 "ASoC: failed to add widget %s dapm kcontrol %s: %d\n",
918                                 w->name, name, ret);
919                         goto exit_free;
920                 }
921         }
922 
923         ret = dapm_kcontrol_add_widget(kcontrol, w);
924         if (ret == 0)
925                 w->kcontrols[kci] = kcontrol;
926 
927 exit_free:
928         kfree(long_name);
929 
930         return ret;
931 }
932 
933 /* create new dapm mixer control */
934 static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
935 {
936         int i, ret;
937         struct snd_soc_dapm_path *path;
938         struct dapm_kcontrol_data *data;
939 
940         /* add kcontrol */
941         for (i = 0; i < w->num_kcontrols; i++) {
942                 /* match name */
943                 snd_soc_dapm_widget_for_each_source_path(w, path) {
944                         /* mixer/mux paths name must match control name */
945                         if (path->name != (char *)w->kcontrol_news[i].name)
946                                 continue;
947 
948                         if (!w->kcontrols[i]) {
949                                 ret = dapm_create_or_share_kcontrol(w, i);
950                                 if (ret < 0)
951                                         return ret;
952                         }
953 
954                         dapm_kcontrol_add_path(w->kcontrols[i], path);
955 
956                         data = snd_kcontrol_chip(w->kcontrols[i]);
957                         if (data->widget)
958                                 snd_soc_dapm_add_path(data->widget->dapm,
959                                                       data->widget,
960                                                       path->source,
961                                                       NULL, NULL);
962                 }
963         }
964 
965         return 0;
966 }
967 
968 /* create new dapm mux control */
969 static int dapm_new_mux(struct snd_soc_dapm_widget *w)
970 {
971         struct snd_soc_dapm_context *dapm = w->dapm;
972         enum snd_soc_dapm_direction dir;
973         struct snd_soc_dapm_path *path;
974         const char *type;
975         int ret;
976 
977         switch (w->id) {
978         case snd_soc_dapm_mux:
979                 dir = SND_SOC_DAPM_DIR_OUT;
980                 type = "mux";
981                 break;
982         case snd_soc_dapm_demux:
983                 dir = SND_SOC_DAPM_DIR_IN;
984                 type = "demux";
985                 break;
986         default:
987                 return -EINVAL;
988         }
989 
990         if (w->num_kcontrols != 1) {
991                 dev_err(dapm->dev,
992                         "ASoC: %s %s has incorrect number of controls\n", type,
993                         w->name);
994                 return -EINVAL;
995         }
996 
997         if (list_empty(&w->edges[dir])) {
998                 dev_err(dapm->dev, "ASoC: %s %s has no paths\n", type, w->name);
999                 return -EINVAL;
1000         }
1001 
1002         ret = dapm_create_or_share_kcontrol(w, 0);
1003         if (ret < 0)
1004                 return ret;
1005 
1006         snd_soc_dapm_widget_for_each_path(w, dir, path) {
1007                 if (path->name)
1008                         dapm_kcontrol_add_path(w->kcontrols[0], path);
1009         }
1010 
1011         return 0;
1012 }
1013 
1014 /* create new dapm volume control */
1015 static int dapm_new_pga(struct snd_soc_dapm_widget *w)
1016 {
1017         int i, ret;
1018 
1019         for (i = 0; i < w->num_kcontrols; i++) {
1020                 ret = dapm_create_or_share_kcontrol(w, i);
1021                 if (ret < 0)
1022                         return ret;
1023         }
1024 
1025         return 0;
1026 }
1027 
1028 /* create new dapm dai link control */
1029 static int dapm_new_dai_link(struct snd_soc_dapm_widget *w)
1030 {
1031         int i, ret;
1032         struct snd_kcontrol *kcontrol;
1033         struct snd_soc_dapm_context *dapm = w->dapm;
1034         struct snd_card *card = dapm->card->snd_card;
1035 
1036         /* create control for links with > 1 config */
1037         if (w->num_params <= 1)
1038                 return 0;
1039 
1040         /* add kcontrol */
1041         for (i = 0; i < w->num_kcontrols; i++) {
1042                 kcontrol = snd_soc_cnew(&w->kcontrol_news[i], w,
1043                                         w->name, NULL);
1044                 ret = snd_ctl_add(card, kcontrol);
1045                 if (ret < 0) {
1046                         dev_err(dapm->dev,
1047                                 "ASoC: failed to add widget %s dapm kcontrol %s: %d\n",
1048                                 w->name, w->kcontrol_news[i].name, ret);
1049                         return ret;
1050                 }
1051                 kcontrol->private_data = w;
1052                 w->kcontrols[i] = kcontrol;
1053         }
1054 
1055         return 0;
1056 }
1057 
1058 /* We implement power down on suspend by checking the power state of
1059  * the ALSA card - when we are suspending the ALSA state for the card
1060  * is set to D3.
1061  */
1062 static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
1063 {
1064         int level = snd_power_get_state(widget->dapm->card->snd_card);
1065 
1066         switch (level) {
1067         case SNDRV_CTL_POWER_D3hot:
1068         case SNDRV_CTL_POWER_D3cold:
1069                 if (widget->ignore_suspend)
1070                         dev_dbg(widget->dapm->dev, "ASoC: %s ignoring suspend\n",
1071                                 widget->name);
1072                 return widget->ignore_suspend;
1073         default:
1074                 return 1;
1075         }
1076 }
1077 
1078 static int dapm_widget_list_create(struct snd_soc_dapm_widget_list **list,
1079         struct list_head *widgets)
1080 {
1081         struct snd_soc_dapm_widget *w;
1082         struct list_head *it;
1083         unsigned int size = 0;
1084         unsigned int i = 0;
1085 
1086         list_for_each(it, widgets)
1087                 size++;
1088 
1089         *list = kzalloc(struct_size(*list, widgets, size), GFP_KERNEL);
1090         if (*list == NULL)
1091                 return -ENOMEM;
1092 
1093         list_for_each_entry(w, widgets, work_list)
1094                 (*list)->widgets[i++] = w;
1095 
1096         (*list)->num_widgets = i;
1097 
1098         return 0;
1099 }
1100 
1101 /*
1102  * Common implementation for is_connected_output_ep() and
1103  * is_connected_input_ep(). The function is inlined since the combined size of
1104  * the two specialized functions is only marginally larger then the size of the
1105  * generic function and at the same time the fast path of the specialized
1106  * functions is significantly smaller than the generic function.
1107  */
1108 static __always_inline int is_connected_ep(struct snd_soc_dapm_widget *widget,
1109         struct list_head *list, enum snd_soc_dapm_direction dir,
1110         int (*fn)(struct snd_soc_dapm_widget *, struct list_head *,
1111                   bool (*custom_stop_condition)(struct snd_soc_dapm_widget *,
1112                                                 enum snd_soc_dapm_direction)),
1113         bool (*custom_stop_condition)(struct snd_soc_dapm_widget *,
1114                                       enum snd_soc_dapm_direction))
1115 {
1116         enum snd_soc_dapm_direction rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
1117         struct snd_soc_dapm_path *path;
1118         int con = 0;
1119 
1120         if (widget->endpoints[dir] >= 0)
1121                 return widget->endpoints[dir];
1122 
1123         DAPM_UPDATE_STAT(widget, path_checks);
1124 
1125         /* do we need to add this widget to the list ? */
1126         if (list)
1127                 list_add_tail(&widget->work_list, list);
1128 
1129         if (custom_stop_condition && custom_stop_condition(widget, dir)) {
1130                 widget->endpoints[dir] = 1;
1131                 return widget->endpoints[dir];
1132         }
1133 
1134         if ((widget->is_ep & SND_SOC_DAPM_DIR_TO_EP(dir)) && widget->connected) {
1135                 widget->endpoints[dir] = snd_soc_dapm_suspend_check(widget);
1136                 return widget->endpoints[dir];
1137         }
1138 
1139         snd_soc_dapm_widget_for_each_path(widget, rdir, path) {
1140                 DAPM_UPDATE_STAT(widget, neighbour_checks);
1141 
1142                 if (path->weak || path->is_supply)
1143                         continue;
1144 
1145                 if (path->walking)
1146                         return 1;
1147 
1148                 trace_snd_soc_dapm_path(widget, dir, path);
1149 
1150                 if (path->connect) {
1151                         path->walking = 1;
1152                         con += fn(path->node[dir], list, custom_stop_condition);
1153                         path->walking = 0;
1154                 }
1155         }
1156 
1157         widget->endpoints[dir] = con;
1158 
1159         return con;
1160 }
1161 
1162 /*
1163  * Recursively check for a completed path to an active or physically connected
1164  * output widget. Returns number of complete paths.
1165  *
1166  * Optionally, can be supplied with a function acting as a stopping condition.
1167  * This function takes the dapm widget currently being examined and the walk
1168  * direction as an arguments, it should return true if the walk should be
1169  * stopped and false otherwise.
1170  */
1171 static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
1172         struct list_head *list,
1173         bool (*custom_stop_condition)(struct snd_soc_dapm_widget *i,
1174                                       enum snd_soc_dapm_direction))
1175 {
1176         return is_connected_ep(widget, list, SND_SOC_DAPM_DIR_OUT,
1177                         is_connected_output_ep, custom_stop_condition);
1178 }
1179 
1180 /*
1181  * Recursively check for a completed path to an active or physically connected
1182  * input widget. Returns number of complete paths.
1183  *
1184  * Optionally, can be supplied with a function acting as a stopping condition.
1185  * This function takes the dapm widget currently being examined and the walk
1186  * direction as an arguments, it should return true if the walk should be
1187  * stopped and false otherwise.
1188  */
1189 static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
1190         struct list_head *list,
1191         bool (*custom_stop_condition)(struct snd_soc_dapm_widget *i,
1192                                       enum snd_soc_dapm_direction))
1193 {
1194         return is_connected_ep(widget, list, SND_SOC_DAPM_DIR_IN,
1195                         is_connected_input_ep, custom_stop_condition);
1196 }
1197 
1198 /**
1199  * snd_soc_dapm_get_connected_widgets - query audio path and it's widgets.
1200  * @dai: the soc DAI.
1201  * @stream: stream direction.
1202  * @list: list of active widgets for this stream.
1203  * @custom_stop_condition: (optional) a function meant to stop the widget graph
1204  *                         walk based on custom logic.
1205  *
1206  * Queries DAPM graph as to whether a valid audio stream path exists for
1207  * the initial stream specified by name. This takes into account
1208  * current mixer and mux kcontrol settings. Creates list of valid widgets.
1209  *
1210  * Optionally, can be supplied with a function acting as a stopping condition.
1211  * This function takes the dapm widget currently being examined and the walk
1212  * direction as an arguments, it should return true if the walk should be
1213  * stopped and false otherwise.
1214  *
1215  * Returns the number of valid paths or negative error.
1216  */
1217 int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
1218         struct snd_soc_dapm_widget_list **list,
1219         bool (*custom_stop_condition)(struct snd_soc_dapm_widget *,
1220                                       enum snd_soc_dapm_direction))
1221 {
1222         struct snd_soc_card *card = dai->component->card;
1223         struct snd_soc_dapm_widget *w;
1224         LIST_HEAD(widgets);
1225         int paths;
1226         int ret;
1227 
1228         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
1229 
1230         /*
1231          * For is_connected_{output,input}_ep fully discover the graph we need
1232          * to reset the cached number of inputs and outputs.
1233          */
1234         list_for_each_entry(w, &card->widgets, list) {
1235                 w->endpoints[SND_SOC_DAPM_DIR_IN] = -1;
1236                 w->endpoints[SND_SOC_DAPM_DIR_OUT] = -1;
1237         }
1238 
1239         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1240                 paths = is_connected_output_ep(dai->playback_widget, &widgets,
1241                                 custom_stop_condition);
1242         else
1243                 paths = is_connected_input_ep(dai->capture_widget, &widgets,
1244                                 custom_stop_condition);
1245 
1246         /* Drop starting point */
1247         list_del(widgets.next);
1248 
1249         ret = dapm_widget_list_create(list, &widgets);
1250         if (ret)
1251                 paths = ret;
1252 
1253         trace_snd_soc_dapm_connected(paths, stream);
1254         mutex_unlock(&card->dapm_mutex);
1255 
1256         return paths;
1257 }
1258 
1259 /*
1260  * Handler for regulator supply widget.
1261  */
1262 int dapm_regulator_event(struct snd_soc_dapm_widget *w,
1263                    struct snd_kcontrol *kcontrol, int event)
1264 {
1265         int ret;
1266 
1267         soc_dapm_async_complete(w->dapm);
1268 
1269         if (SND_SOC_DAPM_EVENT_ON(event)) {
1270                 if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
1271                         ret = regulator_allow_bypass(w->regulator, false);
1272                         if (ret != 0)
1273                                 dev_warn(w->dapm->dev,
1274                                          "ASoC: Failed to unbypass %s: %d\n",
1275                                          w->name, ret);
1276                 }
1277 
1278                 return regulator_enable(w->regulator);
1279         } else {
1280                 if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
1281                         ret = regulator_allow_bypass(w->regulator, true);
1282                         if (ret != 0)
1283                                 dev_warn(w->dapm->dev,
1284                                          "ASoC: Failed to bypass %s: %d\n",
1285                                          w->name, ret);
1286                 }
1287 
1288                 return regulator_disable_deferred(w->regulator, w->shift);
1289         }
1290 }
1291 EXPORT_SYMBOL_GPL(dapm_regulator_event);
1292 
1293 /*
1294  * Handler for pinctrl widget.
1295  */
1296 int dapm_pinctrl_event(struct snd_soc_dapm_widget *w,
1297                        struct snd_kcontrol *kcontrol, int event)
1298 {
1299         struct snd_soc_dapm_pinctrl_priv *priv = w->priv;
1300         struct pinctrl *p = w->pinctrl;
1301         struct pinctrl_state *s;
1302 
1303         if (!p || !priv)
1304                 return -EIO;
1305 
1306         if (SND_SOC_DAPM_EVENT_ON(event))
1307                 s = pinctrl_lookup_state(p, priv->active_state);
1308         else
1309                 s = pinctrl_lookup_state(p, priv->sleep_state);
1310 
1311         if (IS_ERR(s))
1312                 return PTR_ERR(s);
1313 
1314         return pinctrl_select_state(p, s);
1315 }
1316 EXPORT_SYMBOL_GPL(dapm_pinctrl_event);
1317 
1318 /*
1319  * Handler for clock supply widget.
1320  */
1321 int dapm_clock_event(struct snd_soc_dapm_widget *w,
1322                    struct snd_kcontrol *kcontrol, int event)
1323 {
1324         if (!w->clk)
1325                 return -EIO;
1326 
1327         soc_dapm_async_complete(w->dapm);
1328 
1329 #ifdef CONFIG_HAVE_CLK
1330         if (SND_SOC_DAPM_EVENT_ON(event)) {
1331                 return clk_prepare_enable(w->clk);
1332         } else {
1333                 clk_disable_unprepare(w->clk);
1334                 return 0;
1335         }
1336 #endif
1337         return 0;
1338 }
1339 EXPORT_SYMBOL_GPL(dapm_clock_event);
1340 
1341 static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
1342 {
1343         if (w->power_checked)
1344                 return w->new_power;
1345 
1346         if (w->force)
1347                 w->new_power = 1;
1348         else
1349                 w->new_power = w->power_check(w);
1350 
1351         w->power_checked = true;
1352 
1353         return w->new_power;
1354 }
1355 
1356 /* Generic check to see if a widget should be powered. */
1357 static int dapm_generic_check_power(struct snd_soc_dapm_widget *w)
1358 {
1359         int in, out;
1360 
1361         DAPM_UPDATE_STAT(w, power_checks);
1362 
1363         in = is_connected_input_ep(w, NULL, NULL);
1364         out = is_connected_output_ep(w, NULL, NULL);
1365         return out != 0 && in != 0;
1366 }
1367 
1368 /* Check to see if a power supply is needed */
1369 static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
1370 {
1371         struct snd_soc_dapm_path *path;
1372 
1373         DAPM_UPDATE_STAT(w, power_checks);
1374 
1375         /* Check if one of our outputs is connected */
1376         snd_soc_dapm_widget_for_each_sink_path(w, path) {
1377                 DAPM_UPDATE_STAT(w, neighbour_checks);
1378 
1379                 if (path->weak)
1380                         continue;
1381 
1382                 if (path->connected &&
1383                     !path->connected(path->source, path->sink))
1384                         continue;
1385 
1386                 if (dapm_widget_power_check(path->sink))
1387                         return 1;
1388         }
1389 
1390         return 0;
1391 }
1392 
1393 static int dapm_always_on_check_power(struct snd_soc_dapm_widget *w)
1394 {
1395         return w->connected;
1396 }
1397 
1398 static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
1399                             struct snd_soc_dapm_widget *b,
1400                             bool power_up)
1401 {
1402         int *sort;
1403 
1404         if (power_up)
1405                 sort = dapm_up_seq;
1406         else
1407                 sort = dapm_down_seq;
1408 
1409         if (sort[a->id] != sort[b->id])
1410                 return sort[a->id] - sort[b->id];
1411         if (a->subseq != b->subseq) {
1412                 if (power_up)
1413                         return a->subseq - b->subseq;
1414                 else
1415                         return b->subseq - a->subseq;
1416         }
1417         if (a->reg != b->reg)
1418                 return a->reg - b->reg;
1419         if (a->dapm != b->dapm)
1420                 return (unsigned long)a->dapm - (unsigned long)b->dapm;
1421 
1422         return 0;
1423 }
1424 
1425 /* Insert a widget in order into a DAPM power sequence. */
1426 static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget,
1427                             struct list_head *list,
1428                             bool power_up)
1429 {
1430         struct snd_soc_dapm_widget *w;
1431 
1432         list_for_each_entry(w, list, power_list)
1433                 if (dapm_seq_compare(new_widget, w, power_up) < 0) {
1434                         list_add_tail(&new_widget->power_list, &w->power_list);
1435                         return;
1436                 }
1437 
1438         list_add_tail(&new_widget->power_list, list);
1439 }
1440 
1441 static void dapm_seq_check_event(struct snd_soc_card *card,
1442                                  struct snd_soc_dapm_widget *w, int event)
1443 {
1444         const char *ev_name;
1445         int power, ret;
1446 
1447         switch (event) {
1448         case SND_SOC_DAPM_PRE_PMU:
1449                 ev_name = "PRE_PMU";
1450                 power = 1;
1451                 break;
1452         case SND_SOC_DAPM_POST_PMU:
1453                 ev_name = "POST_PMU";
1454                 power = 1;
1455                 break;
1456         case SND_SOC_DAPM_PRE_PMD:
1457                 ev_name = "PRE_PMD";
1458                 power = 0;
1459                 break;
1460         case SND_SOC_DAPM_POST_PMD:
1461                 ev_name = "POST_PMD";
1462                 power = 0;
1463                 break;
1464         case SND_SOC_DAPM_WILL_PMU:
1465                 ev_name = "WILL_PMU";
1466                 power = 1;
1467                 break;
1468         case SND_SOC_DAPM_WILL_PMD:
1469                 ev_name = "WILL_PMD";
1470                 power = 0;
1471                 break;
1472         default:
1473                 WARN(1, "Unknown event %d\n", event);
1474                 return;
1475         }
1476 
1477         if (w->new_power != power)
1478                 return;
1479 
1480         if (w->event && (w->event_flags & event)) {
1481                 pop_dbg(w->dapm->dev, card->pop_time, "pop test : %s %s\n",
1482                         w->name, ev_name);
1483                 soc_dapm_async_complete(w->dapm);
1484                 trace_snd_soc_dapm_widget_event_start(w, event);
1485                 ret = w->event(w, NULL, event);
1486                 trace_snd_soc_dapm_widget_event_done(w, event);
1487                 if (ret < 0)
1488                         dev_err(w->dapm->dev, "ASoC: %s: %s event failed: %d\n",
1489                                ev_name, w->name, ret);
1490         }
1491 }
1492 
1493 /* Apply the coalesced changes from a DAPM sequence */
1494 static void dapm_seq_run_coalesced(struct snd_soc_card *card,
1495                                    struct list_head *pending)
1496 {
1497         struct snd_soc_dapm_context *dapm;
1498         struct snd_soc_dapm_widget *w;
1499         int reg;
1500         unsigned int value = 0;
1501         unsigned int mask = 0;
1502 
1503         w = list_first_entry(pending, struct snd_soc_dapm_widget, power_list);
1504         reg = w->reg;
1505         dapm = w->dapm;
1506 
1507         list_for_each_entry(w, pending, power_list) {
1508                 WARN_ON(reg != w->reg || dapm != w->dapm);
1509                 w->power = w->new_power;
1510 
1511                 mask |= w->mask << w->shift;
1512                 if (w->power)
1513                         value |= w->on_val << w->shift;
1514                 else
1515                         value |= w->off_val << w->shift;
1516 
1517                 pop_dbg(dapm->dev, card->pop_time,
1518                         "pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n",
1519                         w->name, reg, value, mask);
1520 
1521                 /* Check for events */
1522                 dapm_seq_check_event(card, w, SND_SOC_DAPM_PRE_PMU);
1523                 dapm_seq_check_event(card, w, SND_SOC_DAPM_PRE_PMD);
1524         }
1525 
1526         if (reg >= 0) {
1527                 /* Any widget will do, they should all be updating the
1528                  * same register.
1529                  */
1530 
1531                 pop_dbg(dapm->dev, card->pop_time,
1532                         "pop test : Applying 0x%x/0x%x to %x in %dms\n",
1533                         value, mask, reg, card->pop_time);
1534                 pop_wait(card->pop_time);
1535                 soc_dapm_update_bits(dapm, reg, mask, value);
1536         }
1537 
1538         list_for_each_entry(w, pending, power_list) {
1539                 dapm_seq_check_event(card, w, SND_SOC_DAPM_POST_PMU);
1540                 dapm_seq_check_event(card, w, SND_SOC_DAPM_POST_PMD);
1541         }
1542 }
1543 
1544 /* Apply a DAPM power sequence.
1545  *
1546  * We walk over a pre-sorted list of widgets to apply power to.  In
1547  * order to minimise the number of writes to the device required
1548  * multiple widgets will be updated in a single write where possible.
1549  * Currently anything that requires more than a single write is not
1550  * handled.
1551  */
1552 static void dapm_seq_run(struct snd_soc_card *card,
1553         struct list_head *list, int event, bool power_up)
1554 {
1555         struct snd_soc_dapm_widget *w, *n;
1556         struct snd_soc_dapm_context *d;
1557         LIST_HEAD(pending);
1558         int cur_sort = -1;
1559         int cur_subseq = -1;
1560         int cur_reg = SND_SOC_NOPM;
1561         struct snd_soc_dapm_context *cur_dapm = NULL;
1562         int ret, i;
1563         int *sort;
1564 
1565         if (power_up)
1566                 sort = dapm_up_seq;
1567         else
1568                 sort = dapm_down_seq;
1569 
1570         list_for_each_entry_safe(w, n, list, power_list) {
1571                 ret = 0;
1572 
1573                 /* Do we need to apply any queued changes? */
1574                 if (sort[w->id] != cur_sort || w->reg != cur_reg ||
1575                     w->dapm != cur_dapm || w->subseq != cur_subseq) {
1576                         if (!list_empty(&pending))
1577                                 dapm_seq_run_coalesced(card, &pending);
1578 
1579                         if (cur_dapm && cur_dapm->seq_notifier) {
1580                                 for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1581                                         if (sort[i] == cur_sort)
1582                                                 cur_dapm->seq_notifier(cur_dapm,
1583                                                                        i,
1584                                                                        cur_subseq);
1585                         }
1586 
1587                         if (cur_dapm && w->dapm != cur_dapm)
1588                                 soc_dapm_async_complete(cur_dapm);
1589 
1590                         INIT_LIST_HEAD(&pending);
1591                         cur_sort = -1;
1592                         cur_subseq = INT_MIN;
1593                         cur_reg = SND_SOC_NOPM;
1594                         cur_dapm = NULL;
1595                 }
1596 
1597                 switch (w->id) {
1598                 case snd_soc_dapm_pre:
1599                         if (!w->event)
1600                                 list_for_each_entry_safe_continue(w, n, list,
1601                                                                   power_list);
1602 
1603                         if (event == SND_SOC_DAPM_STREAM_START)
1604                                 ret = w->event(w,
1605                                                NULL, SND_SOC_DAPM_PRE_PMU);
1606                         else if (event == SND_SOC_DAPM_STREAM_STOP)
1607                                 ret = w->event(w,
1608                                                NULL, SND_SOC_DAPM_PRE_PMD);
1609                         break;
1610 
1611                 case snd_soc_dapm_post:
1612                         if (!w->event)
1613                                 list_for_each_entry_safe_continue(w, n, list,
1614                                                                   power_list);
1615 
1616                         if (event == SND_SOC_DAPM_STREAM_START)
1617                                 ret = w->event(w,
1618                                                NULL, SND_SOC_DAPM_POST_PMU);
1619                         else if (event == SND_SOC_DAPM_STREAM_STOP)
1620                                 ret = w->event(w,
1621                                                NULL, SND_SOC_DAPM_POST_PMD);
1622                         break;
1623 
1624                 default:
1625                         /* Queue it up for application */
1626                         cur_sort = sort[w->id];
1627                         cur_subseq = w->subseq;
1628                         cur_reg = w->reg;
1629                         cur_dapm = w->dapm;
1630                         list_move(&w->power_list, &pending);
1631                         break;
1632                 }
1633 
1634                 if (ret < 0)
1635                         dev_err(w->dapm->dev,
1636                                 "ASoC: Failed to apply widget power: %d\n", ret);
1637         }
1638 
1639         if (!list_empty(&pending))
1640                 dapm_seq_run_coalesced(card, &pending);
1641 
1642         if (cur_dapm && cur_dapm->seq_notifier) {
1643                 for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1644                         if (sort[i] == cur_sort)
1645                                 cur_dapm->seq_notifier(cur_dapm,
1646                                                        i, cur_subseq);
1647         }
1648 
1649         list_for_each_entry(d, &card->dapm_list, list) {
1650                 soc_dapm_async_complete(d);
1651         }
1652 }
1653 
1654 static void dapm_widget_update(struct snd_soc_card *card)
1655 {
1656         struct snd_soc_dapm_update *update = card->update;
1657         struct snd_soc_dapm_widget_list *wlist;
1658         struct snd_soc_dapm_widget *w = NULL;
1659         unsigned int wi;
1660         int ret;
1661 
1662         if (!update || !dapm_kcontrol_is_powered(update->kcontrol))
1663                 return;
1664 
1665         wlist = dapm_kcontrol_get_wlist(update->kcontrol);
1666 
1667         for (wi = 0; wi < wlist->num_widgets; wi++) {
1668                 w = wlist->widgets[wi];
1669 
1670                 if (w->event && (w->event_flags & SND_SOC_DAPM_PRE_REG)) {
1671                         ret = w->event(w, update->kcontrol, SND_SOC_DAPM_PRE_REG);
1672                         if (ret != 0)
1673                                 dev_err(w->dapm->dev, "ASoC: %s DAPM pre-event failed: %d\n",
1674                                            w->name, ret);
1675                 }
1676         }
1677 
1678         if (!w)
1679                 return;
1680 
1681         ret = soc_dapm_update_bits(w->dapm, update->reg, update->mask,
1682                 update->val);
1683         if (ret < 0)
1684                 dev_err(w->dapm->dev, "ASoC: %s DAPM update failed: %d\n",
1685                         w->name, ret);
1686 
1687         if (update->has_second_set) {
1688                 ret = soc_dapm_update_bits(w->dapm, update->reg2,
1689                                            update->mask2, update->val2);
1690                 if (ret < 0)
1691                         dev_err(w->dapm->dev,
1692                                 "ASoC: %s DAPM update failed: %d\n",
1693                                 w->name, ret);
1694         }
1695 
1696         for (wi = 0; wi < wlist->num_widgets; wi++) {
1697                 w = wlist->widgets[wi];
1698 
1699                 if (w->event && (w->event_flags & SND_SOC_DAPM_POST_REG)) {
1700                         ret = w->event(w, update->kcontrol, SND_SOC_DAPM_POST_REG);
1701                         if (ret != 0)
1702                                 dev_err(w->dapm->dev, "ASoC: %s DAPM post-event failed: %d\n",
1703                                            w->name, ret);
1704                 }
1705         }
1706 }
1707 
1708 /* Async callback run prior to DAPM sequences - brings to _PREPARE if
1709  * they're changing state.
1710  */
1711 static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
1712 {
1713         struct snd_soc_dapm_context *d = data;
1714         int ret;
1715 
1716         /* If we're off and we're not supposed to go into STANDBY */
1717         if (d->bias_level == SND_SOC_BIAS_OFF &&
1718             d->target_bias_level != SND_SOC_BIAS_OFF) {
1719                 if (d->dev)
1720                         pm_runtime_get_sync(d->dev);
1721 
1722                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1723                 if (ret != 0)
1724                         dev_err(d->dev,
1725                                 "ASoC: Failed to turn on bias: %d\n", ret);
1726         }
1727 
1728         /* Prepare for a transition to ON or away from ON */
1729         if ((d->target_bias_level == SND_SOC_BIAS_ON &&
1730              d->bias_level != SND_SOC_BIAS_ON) ||
1731             (d->target_bias_level != SND_SOC_BIAS_ON &&
1732              d->bias_level == SND_SOC_BIAS_ON)) {
1733                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE);
1734                 if (ret != 0)
1735                         dev_err(d->dev,
1736                                 "ASoC: Failed to prepare bias: %d\n", ret);
1737         }
1738 }
1739 
1740 /* Async callback run prior to DAPM sequences - brings to their final
1741  * state.
1742  */
1743 static void dapm_post_sequence_async(void *data, async_cookie_t cookie)
1744 {
1745         struct snd_soc_dapm_context *d = data;
1746         int ret;
1747 
1748         /* If we just powered the last thing off drop to standby bias */
1749         if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1750             (d->target_bias_level == SND_SOC_BIAS_STANDBY ||
1751              d->target_bias_level == SND_SOC_BIAS_OFF)) {
1752                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1753                 if (ret != 0)
1754                         dev_err(d->dev, "ASoC: Failed to apply standby bias: %d\n",
1755                                 ret);
1756         }
1757 
1758         /* If we're in standby and can support bias off then do that */
1759         if (d->bias_level == SND_SOC_BIAS_STANDBY &&
1760             d->target_bias_level == SND_SOC_BIAS_OFF) {
1761                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_OFF);
1762                 if (ret != 0)
1763                         dev_err(d->dev, "ASoC: Failed to turn off bias: %d\n",
1764                                 ret);
1765 
1766                 if (d->dev)
1767                         pm_runtime_put(d->dev);
1768         }
1769 
1770         /* If we just powered up then move to active bias */
1771         if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1772             d->target_bias_level == SND_SOC_BIAS_ON) {
1773                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_ON);
1774                 if (ret != 0)
1775                         dev_err(d->dev, "ASoC: Failed to apply active bias: %d\n",
1776                                 ret);
1777         }
1778 }
1779 
1780 static void dapm_widget_set_peer_power(struct snd_soc_dapm_widget *peer,
1781                                        bool power, bool connect)
1782 {
1783         /* If a connection is being made or broken then that update
1784          * will have marked the peer dirty, otherwise the widgets are
1785          * not connected and this update has no impact. */
1786         if (!connect)
1787                 return;
1788 
1789         /* If the peer is already in the state we're moving to then we
1790          * won't have an impact on it. */
1791         if (power != peer->power)
1792                 dapm_mark_dirty(peer, "peer state change");
1793 }
1794 
1795 static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
1796                                   struct list_head *up_list,
1797                                   struct list_head *down_list)
1798 {
1799         struct snd_soc_dapm_path *path;
1800 
1801         if (w->power == power)
1802                 return;
1803 
1804         trace_snd_soc_dapm_widget_power(w, power);
1805 
1806         /* If we changed our power state perhaps our neigbours changed
1807          * also.
1808          */
1809         snd_soc_dapm_widget_for_each_source_path(w, path)
1810                 dapm_widget_set_peer_power(path->source, power, path->connect);
1811 
1812         /* Supplies can't affect their outputs, only their inputs */
1813         if (!w->is_supply) {
1814                 snd_soc_dapm_widget_for_each_sink_path(w, path)
1815                         dapm_widget_set_peer_power(path->sink, power,
1816                                                    path->connect);
1817         }
1818 
1819         if (power)
1820                 dapm_seq_insert(w, up_list, true);
1821         else
1822                 dapm_seq_insert(w, down_list, false);
1823 }
1824 
1825 static void dapm_power_one_widget(struct snd_soc_dapm_widget *w,
1826                                   struct list_head *up_list,
1827                                   struct list_head *down_list)
1828 {
1829         int power;
1830 
1831         switch (w->id) {
1832         case snd_soc_dapm_pre:
1833                 dapm_seq_insert(w, down_list, false);
1834                 break;
1835         case snd_soc_dapm_post:
1836                 dapm_seq_insert(w, up_list, true);
1837                 break;
1838 
1839         default:
1840                 power = dapm_widget_power_check(w);
1841 
1842                 dapm_widget_set_power(w, power, up_list, down_list);
1843                 break;
1844         }
1845 }
1846 
1847 static bool dapm_idle_bias_off(struct snd_soc_dapm_context *dapm)
1848 {
1849         if (dapm->idle_bias_off)
1850                 return true;
1851 
1852         switch (snd_power_get_state(dapm->card->snd_card)) {
1853         case SNDRV_CTL_POWER_D3hot:
1854         case SNDRV_CTL_POWER_D3cold:
1855                 return dapm->suspend_bias_off;
1856         default:
1857                 break;
1858         }
1859 
1860         return false;
1861 }
1862 
1863 /*
1864  * Scan each dapm widget for complete audio path.
1865  * A complete path is a route that has valid endpoints i.e.:-
1866  *
1867  *  o DAC to output pin.
1868  *  o Input pin to ADC.
1869  *  o Input pin to Output pin (bypass, sidetone)
1870  *  o DAC to ADC (loopback).
1871  */
1872 static int dapm_power_widgets(struct snd_soc_card *card, int event)
1873 {
1874         struct snd_soc_dapm_widget *w;
1875         struct snd_soc_dapm_context *d;
1876         LIST_HEAD(up_list);
1877         LIST_HEAD(down_list);
1878         ASYNC_DOMAIN_EXCLUSIVE(async_domain);
1879         enum snd_soc_bias_level bias;
1880 
1881         lockdep_assert_held(&card->dapm_mutex);
1882 
1883         trace_snd_soc_dapm_start(card);
1884 
1885         list_for_each_entry(d, &card->dapm_list, list) {
1886                 if (dapm_idle_bias_off(d))
1887                         d->target_bias_level = SND_SOC_BIAS_OFF;
1888                 else
1889                         d->target_bias_level = SND_SOC_BIAS_STANDBY;
1890         }
1891 
1892         dapm_reset(card);
1893 
1894         /* Check which widgets we need to power and store them in
1895          * lists indicating if they should be powered up or down.  We
1896          * only check widgets that have been flagged as dirty but note
1897          * that new widgets may be added to the dirty list while we
1898          * iterate.
1899          */
1900         list_for_each_entry(w, &card->dapm_dirty, dirty) {
1901                 dapm_power_one_widget(w, &up_list, &down_list);
1902         }
1903 
1904         list_for_each_entry(w, &card->widgets, list) {
1905                 switch (w->id) {
1906                 case snd_soc_dapm_pre:
1907                 case snd_soc_dapm_post:
1908                         /* These widgets always need to be powered */
1909                         break;
1910                 default:
1911                         list_del_init(&w->dirty);
1912                         break;
1913                 }
1914 
1915                 if (w->new_power) {
1916                         d = w->dapm;
1917 
1918                         /* Supplies and micbiases only bring the
1919                          * context up to STANDBY as unless something
1920                          * else is active and passing audio they
1921                          * generally don't require full power.  Signal
1922                          * generators are virtual pins and have no
1923                          * power impact themselves.
1924                          */
1925                         switch (w->id) {
1926                         case snd_soc_dapm_siggen:
1927                         case snd_soc_dapm_vmid:
1928                                 break;
1929                         case snd_soc_dapm_supply:
1930                         case snd_soc_dapm_regulator_supply:
1931                         case snd_soc_dapm_pinctrl:
1932                         case snd_soc_dapm_clock_supply:
1933                         case snd_soc_dapm_micbias:
1934                                 if (d->target_bias_level < SND_SOC_BIAS_STANDBY)
1935                                         d->target_bias_level = SND_SOC_BIAS_STANDBY;
1936                                 break;
1937                         default:
1938                                 d->target_bias_level = SND_SOC_BIAS_ON;
1939                                 break;
1940                         }
1941                 }
1942 
1943         }
1944 
1945         /* Force all contexts in the card to the same bias state if
1946          * they're not ground referenced.
1947          */
1948         bias = SND_SOC_BIAS_OFF;
1949         list_for_each_entry(d, &card->dapm_list, list)
1950                 if (d->target_bias_level > bias)
1951                         bias = d->target_bias_level;
1952         list_for_each_entry(d, &card->dapm_list, list)
1953                 if (!dapm_idle_bias_off(d))
1954                         d->target_bias_level = bias;
1955 
1956         trace_snd_soc_dapm_walk_done(card);
1957 
1958         /* Run card bias changes at first */
1959         dapm_pre_sequence_async(&card->dapm, 0);
1960         /* Run other bias changes in parallel */
1961         list_for_each_entry(d, &card->dapm_list, list) {
1962                 if (d != &card->dapm)
1963                         async_schedule_domain(dapm_pre_sequence_async, d,
1964                                                 &async_domain);
1965         }
1966         async_synchronize_full_domain(&async_domain);
1967 
1968         list_for_each_entry(w, &down_list, power_list) {
1969                 dapm_seq_check_event(card, w, SND_SOC_DAPM_WILL_PMD);
1970         }
1971 
1972         list_for_each_entry(w, &up_list, power_list) {
1973                 dapm_seq_check_event(card, w, SND_SOC_DAPM_WILL_PMU);
1974         }
1975 
1976         /* Power down widgets first; try to avoid amplifying pops. */
1977         dapm_seq_run(card, &down_list, event, false);
1978 
1979         dapm_widget_update(card);
1980 
1981         /* Now power up. */
1982         dapm_seq_run(card, &up_list, event, true);
1983 
1984         /* Run all the bias changes in parallel */
1985         list_for_each_entry(d, &card->dapm_list, list) {
1986                 if (d != &card->dapm)
1987                         async_schedule_domain(dapm_post_sequence_async, d,
1988                                                 &async_domain);
1989         }
1990         async_synchronize_full_domain(&async_domain);
1991         /* Run card bias changes at last */
1992         dapm_post_sequence_async(&card->dapm, 0);
1993 
1994         /* do we need to notify any clients that DAPM event is complete */
1995         list_for_each_entry(d, &card->dapm_list, list) {
1996                 if (d->stream_event)
1997                         d->stream_event(d, event);
1998         }
1999 
2000         pop_dbg(card->dev, card->pop_time,
2001                 "DAPM sequencing finished, waiting %dms\n", card->pop_time);
2002         pop_wait(card->pop_time);
2003 
2004         trace_snd_soc_dapm_done(card);
2005 
2006         return 0;
2007 }
2008 
2009 #ifdef CONFIG_DEBUG_FS
2010 static ssize_t dapm_widget_power_read_file(struct file *file,
2011                                            char __user *user_buf,
2012                                            size_t count, loff_t *ppos)
2013 {
2014         struct snd_soc_dapm_widget *w = file->private_data;
2015         struct snd_soc_card *card = w->dapm->card;
2016         enum snd_soc_dapm_direction dir, rdir;
2017         char *buf;
2018         int in, out;
2019         ssize_t ret;
2020         struct snd_soc_dapm_path *p = NULL;
2021 
2022         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
2023         if (!buf)
2024                 return -ENOMEM;
2025 
2026         mutex_lock(&card->dapm_mutex);
2027 
2028         /* Supply widgets are not handled by is_connected_{input,output}_ep() */
2029         if (w->is_supply) {
2030                 in = 0;
2031                 out = 0;
2032         } else {
2033                 in = is_connected_input_ep(w, NULL, NULL);
2034                 out = is_connected_output_ep(w, NULL, NULL);
2035         }
2036 
2037         ret = snprintf(buf, PAGE_SIZE, "%s: %s%s  in %d out %d",
2038                        w->name, w->power ? "On" : "Off",
2039                        w->force ? " (forced)" : "", in, out);
2040 
2041         if (w->reg >= 0)
2042                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
2043                                 " - R%d(0x%x) mask 0x%x",
2044                                 w->reg, w->reg, w->mask << w->shift);
2045 
2046         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
2047 
2048         if (w->sname)
2049                 ret += snprintf(buf + ret, PAGE_SIZE - ret, " stream %s %s\n",
2050                                 w->sname,
2051                                 w->active ? "active" : "inactive");
2052 
2053         snd_soc_dapm_for_each_direction(dir) {
2054                 rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
2055                 snd_soc_dapm_widget_for_each_path(w, dir, p) {
2056                         if (p->connected && !p->connected(p->source, p->sink))
2057                                 continue;
2058 
2059                         if (!p->connect)
2060                                 continue;
2061 
2062                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
2063                                         " %s  \"%s\" \"%s\"\n",
2064                                         (rdir == SND_SOC_DAPM_DIR_IN) ? "in" : "out",
2065                                         p->name ? p->name : "static",
2066                                         p->node[rdir]->name);
2067                 }
2068         }
2069 
2070         mutex_unlock(&card->dapm_mutex);
2071 
2072         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
2073 
2074         kfree(buf);
2075         return ret;
2076 }
2077 
2078 static const struct file_operations dapm_widget_power_fops = {
2079         .open = simple_open,
2080         .read = dapm_widget_power_read_file,
2081         .llseek = default_llseek,
2082 };
2083 
2084 static ssize_t dapm_bias_read_file(struct file *file, char __user *user_buf,
2085                                    size_t count, loff_t *ppos)
2086 {
2087         struct snd_soc_dapm_context *dapm = file->private_data;
2088         char *level;
2089 
2090         switch (dapm->bias_level) {
2091         case SND_SOC_BIAS_ON:
2092                 level = "On\n";
2093                 break;
2094         case SND_SOC_BIAS_PREPARE:
2095                 level = "Prepare\n";
2096                 break;
2097         case SND_SOC_BIAS_STANDBY:
2098                 level = "Standby\n";
2099                 break;
2100         case SND_SOC_BIAS_OFF:
2101                 level = "Off\n";
2102                 break;
2103         default:
2104                 WARN(1, "Unknown bias_level %d\n", dapm->bias_level);
2105                 level = "Unknown\n";
2106                 break;
2107         }
2108 
2109         return simple_read_from_buffer(user_buf, count, ppos, level,
2110                                        strlen(level));
2111 }
2112 
2113 static const struct file_operations dapm_bias_fops = {
2114         .open = simple_open,
2115         .read = dapm_bias_read_file,
2116         .llseek = default_llseek,
2117 };
2118 
2119 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
2120         struct dentry *parent)
2121 {
2122         struct dentry *d;
2123 
2124         if (!parent)
2125                 return;
2126 
2127         dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);
2128 
2129         if (!dapm->debugfs_dapm) {
2130                 dev_warn(dapm->dev,
2131                        "ASoC: Failed to create DAPM debugfs directory\n");
2132                 return;
2133         }
2134 
2135         d = debugfs_create_file("bias_level", 0444,
2136                                 dapm->debugfs_dapm, dapm,
2137                                 &dapm_bias_fops);
2138         if (!d)
2139                 dev_warn(dapm->dev,
2140                          "ASoC: Failed to create bias level debugfs file\n");
2141 }
2142 
2143 static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
2144 {
2145         struct snd_soc_dapm_context *dapm = w->dapm;
2146         struct dentry *d;
2147 
2148         if (!dapm->debugfs_dapm || !w->name)
2149                 return;
2150 
2151         d = debugfs_create_file(w->name, 0444,
2152                                 dapm->debugfs_dapm, w,
2153                                 &dapm_widget_power_fops);
2154         if (!d)
2155                 dev_warn(w->dapm->dev,
2156                         "ASoC: Failed to create %s debugfs file\n",
2157                         w->name);
2158 }
2159 
2160 static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
2161 {
2162         debugfs_remove_recursive(dapm->debugfs_dapm);
2163 }
2164 
2165 #else
2166 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
2167         struct dentry *parent)
2168 {
2169 }
2170 
2171 static inline void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
2172 {
2173 }
2174 
2175 static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
2176 {
2177 }
2178 
2179 #endif
2180 
2181 /*
2182  * soc_dapm_connect_path() - Connects or disconnects a path
2183  * @path: The path to update
2184  * @connect: The new connect state of the path. True if the path is connected,
2185  *  false if it is disconnected.
2186  * @reason: The reason why the path changed (for debugging only)
2187  */
2188 static void soc_dapm_connect_path(struct snd_soc_dapm_path *path,
2189         bool connect, const char *reason)
2190 {
2191         if (path->connect == connect)
2192                 return;
2193 
2194         path->connect = connect;
2195         dapm_mark_dirty(path->source, reason);
2196         dapm_mark_dirty(path->sink, reason);
2197         dapm_path_invalidate(path);
2198 }
2199 
2200 /* test and update the power status of a mux widget */
2201 static int soc_dapm_mux_update_power(struct snd_soc_card *card,
2202                                  struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
2203 {
2204         struct snd_soc_dapm_path *path;
2205         int found = 0;
2206         bool connect;
2207 
2208         lockdep_assert_held(&card->dapm_mutex);
2209 
2210         /* find dapm widget path assoc with kcontrol */
2211         dapm_kcontrol_for_each_path(path, kcontrol) {
2212                 found = 1;
2213                 /* we now need to match the string in the enum to the path */
2214                 if (!(strcmp(path->name, e->texts[mux])))
2215                         connect = true;
2216                 else
2217                         connect = false;
2218 
2219                 soc_dapm_connect_path(path, connect, "mux update");
2220         }
2221 
2222         if (found)
2223                 dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
2224 
2225         return found;
2226 }
2227 
2228 int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_context *dapm,
2229         struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e,
2230         struct snd_soc_dapm_update *update)
2231 {
2232         struct snd_soc_card *card = dapm->card;
2233         int ret;
2234 
2235         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2236         card->update = update;
2237         ret = soc_dapm_mux_update_power(card, kcontrol, mux, e);
2238         card->update = NULL;
2239         mutex_unlock(&card->dapm_mutex);
2240         if (ret > 0)
2241                 soc_dpcm_runtime_update(card);
2242         return ret;
2243 }
2244 EXPORT_SYMBOL_GPL(snd_soc_dapm_mux_update_power);
2245 
2246 /* test and update the power status of a mixer or switch widget */
2247 static int soc_dapm_mixer_update_power(struct snd_soc_card *card,
2248                                        struct snd_kcontrol *kcontrol,
2249                                        int connect, int rconnect)
2250 {
2251         struct snd_soc_dapm_path *path;
2252         int found = 0;
2253 
2254         lockdep_assert_held(&card->dapm_mutex);
2255 
2256         /* find dapm widget path assoc with kcontrol */
2257         dapm_kcontrol_for_each_path(path, kcontrol) {
2258                 /*
2259                  * Ideally this function should support any number of
2260                  * paths and channels. But since kcontrols only come
2261                  * in mono and stereo variants, we are limited to 2
2262                  * channels.
2263                  *
2264                  * The following code assumes for stereo controls the
2265                  * first path (when 'found == 0') is the left channel,
2266                  * and all remaining paths (when 'found == 1') are the
2267                  * right channel.
2268                  *
2269                  * A stereo control is signified by a valid 'rconnect'
2270                  * value, either 0 for unconnected, or >= 0 for connected.
2271                  * This is chosen instead of using snd_soc_volsw_is_stereo,
2272                  * so that the behavior of snd_soc_dapm_mixer_update_power
2273                  * doesn't change even when the kcontrol passed in is
2274                  * stereo.
2275                  *
2276                  * It passes 'connect' as the path connect status for
2277                  * the left channel, and 'rconnect' for the right
2278                  * channel.
2279                  */
2280                 if (found && rconnect >= 0)
2281                         soc_dapm_connect_path(path, rconnect, "mixer update");
2282                 else
2283                         soc_dapm_connect_path(path, connect, "mixer update");
2284                 found = 1;
2285         }
2286 
2287         if (found)
2288                 dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
2289 
2290         return found;
2291 }
2292 
2293 int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_context *dapm,
2294         struct snd_kcontrol *kcontrol, int connect,
2295         struct snd_soc_dapm_update *update)
2296 {
2297         struct snd_soc_card *card = dapm->card;
2298         int ret;
2299 
2300         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2301         card->update = update;
2302         ret = soc_dapm_mixer_update_power(card, kcontrol, connect, -1);
2303         card->update = NULL;
2304         mutex_unlock(&card->dapm_mutex);
2305         if (ret > 0)
2306                 soc_dpcm_runtime_update(card);
2307         return ret;
2308 }
2309 EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
2310 
2311 static ssize_t dapm_widget_show_component(struct snd_soc_component *cmpnt,
2312         char *buf)
2313 {
2314         struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(cmpnt);
2315         struct snd_soc_dapm_widget *w;
2316         int count = 0;
2317         char *state = "not set";
2318 
2319         /* card won't be set for the dummy component, as a spot fix
2320          * we're checking for that case specifically here but in future
2321          * we will ensure that the dummy component looks like others.
2322          */
2323         if (!cmpnt->card)
2324                 return 0;
2325 
2326         list_for_each_entry(w, &cmpnt->card->widgets, list) {
2327                 if (w->dapm != dapm)
2328                         continue;
2329 
2330                 /* only display widgets that burn power */
2331                 switch (w->id) {
2332                 case snd_soc_dapm_hp:
2333                 case snd_soc_dapm_mic:
2334                 case snd_soc_dapm_spk:
2335                 case snd_soc_dapm_line:
2336                 case snd_soc_dapm_micbias:
2337                 case snd_soc_dapm_dac:
2338                 case snd_soc_dapm_adc:
2339                 case snd_soc_dapm_pga:
2340                 case snd_soc_dapm_out_drv:
2341                 case snd_soc_dapm_mixer:
2342                 case snd_soc_dapm_mixer_named_ctl:
2343                 case snd_soc_dapm_supply:
2344                 case snd_soc_dapm_regulator_supply:
2345                 case snd_soc_dapm_pinctrl:
2346                 case snd_soc_dapm_clock_supply:
2347                         if (w->name)
2348                                 count += sprintf(buf + count, "%s: %s\n",
2349                                         w->name, w->power ? "On":"Off");
2350                 break;
2351                 default:
2352                 break;
2353                 }
2354         }
2355 
2356         switch (snd_soc_dapm_get_bias_level(dapm)) {
2357         case SND_SOC_BIAS_ON:
2358                 state = "On";
2359                 break;
2360         case SND_SOC_BIAS_PREPARE:
2361                 state = "Prepare";
2362                 break;
2363         case SND_SOC_BIAS_STANDBY:
2364                 state = "Standby";
2365                 break;
2366         case SND_SOC_BIAS_OFF:
2367                 state = "Off";
2368                 break;
2369         }
2370         count += sprintf(buf + count, "PM State: %s\n", state);
2371 
2372         return count;
2373 }
2374 
2375 /* show dapm widget status in sys fs */
2376 static ssize_t dapm_widget_show(struct device *dev,
2377         struct device_attribute *attr, char *buf)
2378 {
2379         struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
2380         int i, count = 0;
2381 
2382         mutex_lock(&rtd->card->dapm_mutex);
2383 
2384         for (i = 0; i < rtd->num_codecs; i++) {
2385                 struct snd_soc_component *cmpnt = rtd->codec_dais[i]->component;
2386 
2387                 count += dapm_widget_show_component(cmpnt, buf + count);
2388         }
2389 
2390         mutex_unlock(&rtd->card->dapm_mutex);
2391 
2392         return count;
2393 }
2394 
2395 static DEVICE_ATTR_RO(dapm_widget);
2396 
2397 struct attribute *soc_dapm_dev_attrs[] = {
2398         &dev_attr_dapm_widget.attr,
2399         NULL
2400 };
2401 
2402 static void dapm_free_path(struct snd_soc_dapm_path *path)
2403 {
2404         list_del(&path->list_node[SND_SOC_DAPM_DIR_IN]);
2405         list_del(&path->list_node[SND_SOC_DAPM_DIR_OUT]);
2406         list_del(&path->list_kcontrol);
2407         list_del(&path->list);
2408         kfree(path);
2409 }
2410 
2411 void snd_soc_dapm_free_widget(struct snd_soc_dapm_widget *w)
2412 {
2413         struct snd_soc_dapm_path *p, *next_p;
2414         enum snd_soc_dapm_direction dir;
2415 
2416         list_del(&w->list);
2417         /*
2418          * remove source and sink paths associated to this widget.
2419          * While removing the path, remove reference to it from both
2420          * source and sink widgets so that path is removed only once.
2421          */
2422         snd_soc_dapm_for_each_direction(dir) {
2423                 snd_soc_dapm_widget_for_each_path_safe(w, dir, p, next_p)
2424                         dapm_free_path(p);
2425         }
2426 
2427         kfree(w->kcontrols);
2428         kfree_const(w->name);
2429         kfree(w);
2430 }
2431 
2432 void snd_soc_dapm_reset_cache(struct snd_soc_dapm_context *dapm)
2433 {
2434         dapm->path_sink_cache.widget = NULL;
2435         dapm->path_source_cache.widget = NULL;
2436 }
2437 
2438 /* free all dapm widgets and resources */
2439 static void dapm_free_widgets(struct snd_soc_dapm_context *dapm)
2440 {
2441         struct snd_soc_dapm_widget *w, *next_w;
2442 
2443         list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
2444                 if (w->dapm != dapm)
2445                         continue;
2446                 snd_soc_dapm_free_widget(w);
2447         }
2448         snd_soc_dapm_reset_cache(dapm);
2449 }
2450 
2451 static struct snd_soc_dapm_widget *dapm_find_widget(
2452                         struct snd_soc_dapm_context *dapm, const char *pin,
2453                         bool search_other_contexts)
2454 {
2455         struct snd_soc_dapm_widget *w;
2456         struct snd_soc_dapm_widget *fallback = NULL;
2457 
2458         list_for_each_entry(w, &dapm->card->widgets, list) {
2459                 if (!strcmp(w->name, pin)) {
2460                         if (w->dapm == dapm)
2461                                 return w;
2462                         else
2463                                 fallback = w;
2464                 }
2465         }
2466 
2467         if (search_other_contexts)
2468                 return fallback;
2469 
2470         return NULL;
2471 }
2472 
2473 static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
2474                                 const char *pin, int status)
2475 {
2476         struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
2477 
2478         dapm_assert_locked(dapm);
2479 
2480         if (!w) {
2481                 dev_err(dapm->dev, "ASoC: DAPM unknown pin %s\n", pin);
2482                 return -EINVAL;
2483         }
2484 
2485         if (w->connected != status) {
2486                 dapm_mark_dirty(w, "pin configuration");
2487                 dapm_widget_invalidate_input_paths(w);
2488                 dapm_widget_invalidate_output_paths(w);
2489         }
2490 
2491         w->connected = status;
2492         if (status == 0)
2493                 w->force = 0;
2494 
2495         return 0;
2496 }
2497 
2498 /**
2499  * snd_soc_dapm_sync_unlocked - scan and power dapm paths
2500  * @dapm: DAPM context
2501  *
2502  * Walks all dapm audio paths and powers widgets according to their
2503  * stream or path usage.
2504  *
2505  * Requires external locking.
2506  *
2507  * Returns 0 for success.
2508  */
2509 int snd_soc_dapm_sync_unlocked(struct snd_soc_dapm_context *dapm)
2510 {
2511         /*
2512          * Suppress early reports (eg, jacks syncing their state) to avoid
2513          * silly DAPM runs during card startup.
2514          */
2515         if (!dapm->card || !dapm->card->instantiated)
2516                 return 0;
2517 
2518         return dapm_power_widgets(dapm->card, SND_SOC_DAPM_STREAM_NOP);
2519 }
2520 EXPORT_SYMBOL_GPL(snd_soc_dapm_sync_unlocked);
2521 
2522 /**
2523  * snd_soc_dapm_sync - scan and power dapm paths
2524  * @dapm: DAPM context
2525  *
2526  * Walks all dapm audio paths and powers widgets according to their
2527  * stream or path usage.
2528  *
2529  * Returns 0 for success.
2530  */
2531 int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
2532 {
2533         int ret;
2534 
2535         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2536         ret = snd_soc_dapm_sync_unlocked(dapm);
2537         mutex_unlock(&dapm->card->dapm_mutex);
2538         return ret;
2539 }
2540 EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
2541 
2542 /*
2543  * dapm_update_widget_flags() - Re-compute widget sink and source flags
2544  * @w: The widget for which to update the flags
2545  *
2546  * Some widgets have a dynamic category which depends on which neighbors they
2547  * are connected to. This function update the category for these widgets.
2548  *
2549  * This function must be called whenever a path is added or removed to a widget.
2550  */
2551 static void dapm_update_widget_flags(struct snd_soc_dapm_widget *w)
2552 {
2553         enum snd_soc_dapm_direction dir;
2554         struct snd_soc_dapm_path *p;
2555         unsigned int ep;
2556 
2557         switch (w->id) {
2558         case snd_soc_dapm_input:
2559                 /* On a fully routed card an input is never a source */
2560                 if (w->dapm->card->fully_routed)
2561                         return;
2562                 ep = SND_SOC_DAPM_EP_SOURCE;
2563                 snd_soc_dapm_widget_for_each_source_path(w, p) {
2564                         if (p->source->id == snd_soc_dapm_micbias ||
2565                                 p->source->id == snd_soc_dapm_mic ||
2566                                 p->source->id == snd_soc_dapm_line ||
2567                                 p->source->id == snd_soc_dapm_output) {
2568                                         ep = 0;
2569                                         break;
2570                         }
2571                 }
2572                 break;
2573         case snd_soc_dapm_output:
2574                 /* On a fully routed card a output is never a sink */
2575                 if (w->dapm->card->fully_routed)
2576                         return;
2577                 ep = SND_SOC_DAPM_EP_SINK;
2578                 snd_soc_dapm_widget_for_each_sink_path(w, p) {
2579                         if (p->sink->id == snd_soc_dapm_spk ||
2580                                 p->sink->id == snd_soc_dapm_hp ||
2581                                 p->sink->id == snd_soc_dapm_line ||
2582                                 p->sink->id == snd_soc_dapm_input) {
2583                                         ep = 0;
2584                                         break;
2585                         }
2586                 }
2587                 break;
2588         case snd_soc_dapm_line:
2589                 ep = 0;
2590                 snd_soc_dapm_for_each_direction(dir) {
2591                         if (!list_empty(&w->edges[dir]))
2592                                 ep |= SND_SOC_DAPM_DIR_TO_EP(dir);
2593                 }
2594                 break;
2595         default:
2596                 return;
2597         }
2598 
2599         w->is_ep = ep;
2600 }
2601 
2602 static int snd_soc_dapm_check_dynamic_path(struct snd_soc_dapm_context *dapm,
2603         struct snd_soc_dapm_widget *source, struct snd_soc_dapm_widget *sink,
2604         const char *control)
2605 {
2606         bool dynamic_source = false;
2607         bool dynamic_sink = false;
2608 
2609         if (!control)
2610                 return 0;
2611 
2612         switch (source->id) {
2613         case snd_soc_dapm_demux:
2614                 dynamic_source = true;
2615                 break;
2616         default:
2617                 break;
2618         }
2619 
2620         switch (sink->id) {
2621         case snd_soc_dapm_mux:
2622         case snd_soc_dapm_switch:
2623         case snd_soc_dapm_mixer:
2624         case snd_soc_dapm_mixer_named_ctl:
2625                 dynamic_sink = true;
2626                 break;
2627         default:
2628                 break;
2629         }
2630 
2631         if (dynamic_source && dynamic_sink) {
2632                 dev_err(dapm->dev,
2633                         "Direct connection between demux and mixer/mux not supported for path %s -> [%s] -> %s\n",
2634                         source->name, control, sink->name);
2635                 return -EINVAL;
2636         } else if (!dynamic_source && !dynamic_sink) {
2637                 dev_err(dapm->dev,
2638                         "Control not supported for path %s -> [%s] -> %s\n",
2639                         source->name, control, sink->name);
2640                 return -EINVAL;
2641         }
2642 
2643         return 0;
2644 }
2645 
2646 static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
2647         struct snd_soc_dapm_widget *wsource, struct snd_soc_dapm_widget *wsink,
2648         const char *control,
2649         int (*connected)(struct snd_soc_dapm_widget *source,
2650                          struct snd_soc_dapm_widget *sink))
2651 {
2652         struct snd_soc_dapm_widget *widgets[2];
2653         enum snd_soc_dapm_direction dir;
2654         struct snd_soc_dapm_path *path;
2655         int ret;
2656 
2657         if (wsink->is_supply && !wsource->is_supply) {
2658                 dev_err(dapm->dev,
2659                         "Connecting non-supply widget to supply widget is not supported (%s -> %s)\n",
2660                         wsource->name, wsink->name);
2661                 return -EINVAL;
2662         }
2663 
2664         if (connected && !wsource->is_supply) {
2665                 dev_err(dapm->dev,
2666                         "connected() callback only supported for supply widgets (%s -> %s)\n",
2667                         wsource->name, wsink->name);
2668                 return -EINVAL;
2669         }
2670 
2671         if (wsource->is_supply && control) {
2672                 dev_err(dapm->dev,
2673                         "Conditional paths are not supported for supply widgets (%s -> [%s] -> %s)\n",
2674                         wsource->name, control, wsink->name);
2675                 return -EINVAL;
2676         }
2677 
2678         ret = snd_soc_dapm_check_dynamic_path(dapm, wsource, wsink, control);
2679         if (ret)
2680                 return ret;
2681 
2682         path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
2683         if (!path)
2684                 return -ENOMEM;
2685 
2686         path->node[SND_SOC_DAPM_DIR_IN] = wsource;
2687         path->node[SND_SOC_DAPM_DIR_OUT] = wsink;
2688         widgets[SND_SOC_DAPM_DIR_IN] = wsource;
2689         widgets[SND_SOC_DAPM_DIR_OUT] = wsink;
2690 
2691         path->connected = connected;
2692         INIT_LIST_HEAD(&path->list);
2693         INIT_LIST_HEAD(&path->list_kcontrol);
2694 
2695         if (wsource->is_supply || wsink->is_supply)
2696                 path->is_supply = 1;
2697 
2698         /* connect static paths */
2699         if (control == NULL) {
2700                 path->connect = 1;
2701         } else {
2702                 switch (wsource->id) {
2703                 case snd_soc_dapm_demux:
2704                         ret = dapm_connect_mux(dapm, path, control, wsource);
2705                         if (ret)
2706                                 goto err;
2707                         break;
2708                 default:
2709                         break;
2710                 }
2711 
2712                 switch (wsink->id) {
2713                 case snd_soc_dapm_mux:
2714                         ret = dapm_connect_mux(dapm, path, control, wsink);
2715                         if (ret != 0)
2716                                 goto err;
2717                         break;
2718                 case snd_soc_dapm_switch:
2719                 case snd_soc_dapm_mixer:
2720                 case snd_soc_dapm_mixer_named_ctl:
2721                         ret = dapm_connect_mixer(dapm, path, control);
2722                         if (ret != 0)
2723                                 goto err;
2724                         break;
2725                 default:
2726                         break;
2727                 }
2728         }
2729 
2730         list_add(&path->list, &dapm->card->paths);
2731         snd_soc_dapm_for_each_direction(dir)
2732                 list_add(&path->list_node[dir], &widgets[dir]->edges[dir]);
2733 
2734         snd_soc_dapm_for_each_direction(dir) {
2735                 dapm_update_widget_flags(widgets[dir]);
2736                 dapm_mark_dirty(widgets[dir], "Route added");
2737         }
2738 
2739         if (dapm->card->instantiated && path->connect)
2740                 dapm_path_invalidate(path);
2741 
2742         return 0;
2743 err:
2744         kfree(path);
2745         return ret;
2746 }
2747 
2748 static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
2749                                   const struct snd_soc_dapm_route *route)
2750 {
2751         struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
2752         struct snd_soc_dapm_widget *wtsource = NULL, *wtsink = NULL;
2753         const char *sink;
2754         const char *source;
2755         char prefixed_sink[80];
2756         char prefixed_source[80];
2757         const char *prefix;
2758         int ret;
2759 
2760         prefix = soc_dapm_prefix(dapm);
2761         if (prefix) {
2762                 snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
2763                          prefix, route->sink);
2764                 sink = prefixed_sink;
2765                 snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
2766                          prefix, route->source);
2767                 source = prefixed_source;
2768         } else {
2769                 sink = route->sink;
2770                 source = route->source;
2771         }
2772 
2773         wsource = dapm_wcache_lookup(&dapm->path_source_cache, source);
2774         wsink = dapm_wcache_lookup(&dapm->path_sink_cache, sink);
2775 
2776         if (wsink && wsource)
2777                 goto skip_search;
2778 
2779         /*
2780          * find src and dest widgets over all widgets but favor a widget from
2781          * current DAPM context
2782          */
2783         list_for_each_entry(w, &dapm->card->widgets, list) {
2784                 if (!wsink && !(strcmp(w->name, sink))) {
2785                         wtsink = w;
2786                         if (w->dapm == dapm) {
2787                                 wsink = w;
2788                                 if (wsource)
2789                                         break;
2790                         }
2791                         continue;
2792                 }
2793                 if (!wsource && !(strcmp(w->name, source))) {
2794                         wtsource = w;
2795                         if (w->dapm == dapm) {
2796                                 wsource = w;
2797                                 if (wsink)
2798                                         break;
2799                         }
2800                 }
2801         }
2802         /* use widget from another DAPM context if not found from this */
2803         if (!wsink)
2804                 wsink = wtsink;
2805         if (!wsource)
2806                 wsource = wtsource;
2807 
2808         if (wsource == NULL) {
2809                 dev_err(dapm->dev, "ASoC: no source widget found for %s\n",
2810                         route->source);
2811                 return -ENODEV;
2812         }
2813         if (wsink == NULL) {
2814                 dev_err(dapm->dev, "ASoC: no sink widget found for %s\n",
2815                         route->sink);
2816                 return -ENODEV;
2817         }
2818 
2819 skip_search:
2820         dapm_wcache_update(&dapm->path_sink_cache, wsink);
2821         dapm_wcache_update(&dapm->path_source_cache, wsource);
2822 
2823         ret = snd_soc_dapm_add_path(dapm, wsource, wsink, route->control,
2824                 route->connected);
2825         if (ret)
2826                 goto err;
2827 
2828         return 0;
2829 err:
2830         dev_warn(dapm->dev, "ASoC: no dapm match for %s --> %s --> %s\n",
2831                  source, route->control, sink);
2832         return ret;
2833 }
2834 
2835 static int snd_soc_dapm_del_route(struct snd_soc_dapm_context *dapm,
2836                                   const struct snd_soc_dapm_route *route)
2837 {
2838         struct snd_soc_dapm_widget *wsource, *wsink;
2839         struct snd_soc_dapm_path *path, *p;
2840         const char *sink;
2841         const char *source;
2842         char prefixed_sink[80];
2843         char prefixed_source[80];
2844         const char *prefix;
2845 
2846         if (route->control) {
2847                 dev_err(dapm->dev,
2848                         "ASoC: Removal of routes with controls not supported\n");
2849                 return -EINVAL;
2850         }
2851 
2852         prefix = soc_dapm_prefix(dapm);
2853         if (prefix) {
2854                 snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
2855                          prefix, route->sink);
2856                 sink = prefixed_sink;
2857                 snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
2858                          prefix, route->source);
2859                 source = prefixed_source;
2860         } else {
2861                 sink = route->sink;
2862                 source = route->source;
2863         }
2864 
2865         path = NULL;
2866         list_for_each_entry(p, &dapm->card->paths, list) {
2867                 if (strcmp(p->source->name, source) != 0)
2868                         continue;
2869                 if (strcmp(p->sink->name, sink) != 0)
2870                         continue;
2871                 path = p;
2872                 break;
2873         }
2874 
2875         if (path) {
2876                 wsource = path->source;
2877                 wsink = path->sink;
2878 
2879                 dapm_mark_dirty(wsource, "Route removed");
2880                 dapm_mark_dirty(wsink, "Route removed");
2881                 if (path->connect)
2882                         dapm_path_invalidate(path);
2883 
2884                 dapm_free_path(path);
2885 
2886                 /* Update any path related flags */
2887                 dapm_update_widget_flags(wsource);
2888                 dapm_update_widget_flags(wsink);
2889         } else {
2890                 dev_warn(dapm->dev, "ASoC: Route %s->%s does not exist\n",
2891                          source, sink);
2892         }
2893 
2894         return 0;
2895 }
2896 
2897 /**
2898  * snd_soc_dapm_add_routes - Add routes between DAPM widgets
2899  * @dapm: DAPM context
2900  * @route: audio routes
2901  * @num: number of routes
2902  *
2903  * Connects 2 dapm widgets together via a named audio path. The sink is
2904  * the widget receiving the audio signal, whilst the source is the sender
2905  * of the audio signal.
2906  *
2907  * Returns 0 for success else error. On error all resources can be freed
2908  * with a call to snd_soc_card_free().
2909  */
2910 int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
2911                             const struct snd_soc_dapm_route *route, int num)
2912 {
2913         int i, r, ret = 0;
2914 
2915         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2916         for (i = 0; i < num; i++) {
2917                 r = snd_soc_dapm_add_route(dapm, route);
2918                 if (r < 0) {
2919                         dev_err(dapm->dev, "ASoC: Failed to add route %s -> %s -> %s\n",
2920                                 route->source,
2921                                 route->control ? route->control : "direct",
2922                                 route->sink);
2923                         ret = r;
2924                 }
2925                 route++;
2926         }
2927         mutex_unlock(&dapm->card->dapm_mutex);
2928 
2929         return ret;
2930 }
2931 EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);
2932 
2933 /**
2934  * snd_soc_dapm_del_routes - Remove routes between DAPM widgets
2935  * @dapm: DAPM context
2936  * @route: audio routes
2937  * @num: number of routes
2938  *
2939  * Removes routes from the DAPM context.
2940  */
2941 int snd_soc_dapm_del_routes(struct snd_soc_dapm_context *dapm,
2942                             const struct snd_soc_dapm_route *route, int num)
2943 {
2944         int i;
2945 
2946         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2947         for (i = 0; i < num; i++) {
2948                 snd_soc_dapm_del_route(dapm, route);
2949                 route++;
2950         }
2951         mutex_unlock(&dapm->card->dapm_mutex);
2952 
2953         return 0;
2954 }
2955 EXPORT_SYMBOL_GPL(snd_soc_dapm_del_routes);
2956 
2957 static int snd_soc_dapm_weak_route(struct snd_soc_dapm_context *dapm,
2958                                    const struct snd_soc_dapm_route *route)
2959 {
2960         struct snd_soc_dapm_widget *source = dapm_find_widget(dapm,
2961                                                               route->source,
2962                                                               true);
2963         struct snd_soc_dapm_widget *sink = dapm_find_widget(dapm,
2964                                                             route->sink,
2965                                                             true);
2966         struct snd_soc_dapm_path *path;
2967         int count = 0;
2968 
2969         if (!source) {
2970                 dev_err(dapm->dev, "ASoC: Unable to find source %s for weak route\n",
2971                         route->source);
2972                 return -ENODEV;
2973         }
2974 
2975         if (!sink) {
2976                 dev_err(dapm->dev, "ASoC: Unable to find sink %s for weak route\n",
2977                         route->sink);
2978                 return -ENODEV;
2979         }
2980 
2981         if (route->control || route->connected)
2982                 dev_warn(dapm->dev, "ASoC: Ignoring control for weak route %s->%s\n",
2983                          route->source, route->sink);
2984 
2985         snd_soc_dapm_widget_for_each_sink_path(source, path) {
2986                 if (path->sink == sink) {
2987                         path->weak = 1;
2988                         count++;
2989                 }
2990         }
2991 
2992         if (count == 0)
2993                 dev_err(dapm->dev, "ASoC: No path found for weak route %s->%s\n",
2994                         route->source, route->sink);
2995         if (count > 1)
2996                 dev_warn(dapm->dev, "ASoC: %d paths found for weak route %s->%s\n",
2997                          count, route->source, route->sink);
2998 
2999         return 0;
3000 }
3001 
3002 /**
3003  * snd_soc_dapm_weak_routes - Mark routes between DAPM widgets as weak
3004  * @dapm: DAPM context
3005  * @route: audio routes
3006  * @num: number of routes
3007  *
3008  * Mark existing routes matching those specified in the passed array
3009  * as being weak, meaning that they are ignored for the purpose of
3010  * power decisions.  The main intended use case is for sidetone paths
3011  * which couple audio between other independent paths if they are both
3012  * active in order to make the combination work better at the user
3013  * level but which aren't intended to be "used".
3014  *
3015  * Note that CODEC drivers should not use this as sidetone type paths
3016  * can frequently also be used as bypass paths.
3017  */
3018 int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
3019                              const struct snd_soc_dapm_route *route, int num)
3020 {
3021         int i, err;
3022         int ret = 0;
3023 
3024         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
3025         for (i = 0; i < num; i++) {
3026                 err = snd_soc_dapm_weak_route(dapm, route);
3027                 if (err)
3028                         ret = err;
3029                 route++;
3030         }
3031         mutex_unlock(&dapm->card->dapm_mutex);
3032 
3033         return ret;
3034 }
3035 EXPORT_SYMBOL_GPL(snd_soc_dapm_weak_routes);
3036 
3037 /**
3038  * snd_soc_dapm_new_widgets - add new dapm widgets
3039  * @card: card to be checked for new dapm widgets
3040  *
3041  * Checks the codec for any new dapm widgets and creates them if found.
3042  *
3043  * Returns 0 for success.
3044  */
3045 int snd_soc_dapm_new_widgets(struct snd_soc_card *card)
3046 {
3047         struct snd_soc_dapm_widget *w;
3048         unsigned int val;
3049 
3050         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
3051 
3052         list_for_each_entry(w, &card->widgets, list)
3053         {
3054                 if (w->new)
3055                         continue;
3056 
3057                 if (w->num_kcontrols) {
3058                         w->kcontrols = kcalloc(w->num_kcontrols,
3059                                                 sizeof(struct snd_kcontrol *),
3060                                                 GFP_KERNEL);
3061                         if (!w->kcontrols) {
3062                                 mutex_unlock(&card->dapm_mutex);
3063                                 return -ENOMEM;
3064                         }
3065                 }
3066 
3067                 switch(w->id) {
3068                 case snd_soc_dapm_switch:
3069                 case snd_soc_dapm_mixer:
3070                 case snd_soc_dapm_mixer_named_ctl:
3071                         dapm_new_mixer(w);
3072                         break;
3073                 case snd_soc_dapm_mux:
3074                 case snd_soc_dapm_demux:
3075                         dapm_new_mux(w);
3076                         break;
3077                 case snd_soc_dapm_pga:
3078                 case snd_soc_dapm_out_drv:
3079                         dapm_new_pga(w);
3080                         break;
3081                 case snd_soc_dapm_dai_link:
3082                         dapm_new_dai_link(w);
3083                         break;
3084                 default:
3085                         break;
3086                 }
3087 
3088                 /* Read the initial power state from the device */
3089                 if (w->reg >= 0) {
3090                         soc_dapm_read(w->dapm, w->reg, &val);
3091                         val = val >> w->shift;
3092                         val &= w->mask;
3093                         if (val == w->on_val)
3094                                 w->power = 1;
3095                 }
3096 
3097                 w->new = 1;
3098 
3099                 dapm_mark_dirty(w, "new widget");
3100                 dapm_debugfs_add_widget(w);
3101         }
3102 
3103         dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
3104         mutex_unlock(&card->dapm_mutex);
3105         return 0;
3106 }
3107 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);
3108 
3109 /**
3110  * snd_soc_dapm_get_volsw - dapm mixer get callback
3111  * @kcontrol: mixer control
3112  * @ucontrol: control element information
3113  *
3114  * Callback to get the value of a dapm mixer control.
3115  *
3116  * Returns 0 for success.
3117  */
3118 int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
3119         struct snd_ctl_elem_value *ucontrol)
3120 {
3121         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
3122         struct snd_soc_card *card = dapm->card;
3123         struct soc_mixer_control *mc =
3124                 (struct soc_mixer_control *)kcontrol->private_value;
3125         int reg = mc->reg;
3126         unsigned int shift = mc->shift;
3127         int max = mc->max;
3128         unsigned int width = fls(max);
3129         unsigned int mask = (1 << fls(max)) - 1;
3130         unsigned int invert = mc->invert;
3131         unsigned int reg_val, val, rval = 0;
3132         int ret = 0;
3133 
3134         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3135         if (dapm_kcontrol_is_powered(kcontrol) && reg != SND_SOC_NOPM) {
3136                 ret = soc_dapm_read(dapm, reg, &reg_val);
3137                 val = (reg_val >> shift) & mask;
3138 
3139                 if (ret == 0 && reg != mc->rreg)
3140                         ret = soc_dapm_read(dapm, mc->rreg, &reg_val);
3141 
3142                 if (snd_soc_volsw_is_stereo(mc))
3143                         rval = (reg_val >> mc->rshift) & mask;
3144         } else {
3145                 reg_val = dapm_kcontrol_get_value(kcontrol);
3146                 val = reg_val & mask;
3147 
3148                 if (snd_soc_volsw_is_stereo(mc))
3149                         rval = (reg_val >> width) & mask;
3150         }
3151         mutex_unlock(&card->dapm_mutex);
3152 
3153         if (ret)
3154                 return ret;
3155 
3156         if (invert)
3157                 ucontrol->value.integer.value[0] = max - val;
3158         else
3159                 ucontrol->value.integer.value[0] = val;
3160 
3161         if (snd_soc_volsw_is_stereo(mc)) {
3162                 if (invert)
3163                         ucontrol->value.integer.value[1] = max - rval;
3164                 else
3165                         ucontrol->value.integer.value[1] = rval;
3166         }
3167 
3168         return ret;
3169 }
3170 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_volsw);
3171 
3172 /**
3173  * snd_soc_dapm_put_volsw - dapm mixer set callback
3174  * @kcontrol: mixer control
3175  * @ucontrol: control element information
3176  *
3177  * Callback to set the value of a dapm mixer control.
3178  *
3179  * Returns 0 for success.
3180  */
3181 int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
3182         struct snd_ctl_elem_value *ucontrol)
3183 {
3184         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
3185         struct snd_soc_card *card = dapm->card;
3186         struct soc_mixer_control *mc =
3187                 (struct soc_mixer_control *)kcontrol->private_value;
3188         int reg = mc->reg;
3189         unsigned int shift = mc->shift;
3190         int max = mc->max;
3191         unsigned int width = fls(max);
3192         unsigned int mask = (1 << width) - 1;
3193         unsigned int invert = mc->invert;
3194         unsigned int val, rval = 0;
3195         int connect, rconnect = -1, change, reg_change = 0;
3196         struct snd_soc_dapm_update update = {};
3197         int ret = 0;
3198 
3199         val = (ucontrol->value.integer.value[0] & mask);
3200         connect = !!val;
3201 
3202         if (invert)
3203                 val = max - val;
3204 
3205         if (snd_soc_volsw_is_stereo(mc)) {
3206                 rval = (ucontrol->value.integer.value[1] & mask);
3207                 rconnect = !!rval;
3208                 if (invert)
3209                         rval = max - rval;
3210         }
3211 
3212         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3213 
3214         /* This assumes field width < (bits in unsigned int / 2) */
3215         if (width > sizeof(unsigned int) * 8 / 2)
3216                 dev_warn(dapm->dev,
3217                          "ASoC: control %s field width limit exceeded\n",
3218                          kcontrol->id.name);
3219         change = dapm_kcontrol_set_value(kcontrol, val | (rval << width));
3220 
3221         if (reg != SND_SOC_NOPM) {
3222                 val = val << shift;
3223                 rval = rval << mc->rshift;
3224 
3225                 reg_change = soc_dapm_test_bits(dapm, reg, mask << shift, val);
3226 
3227                 if (snd_soc_volsw_is_stereo(mc))
3228                         reg_change |= soc_dapm_test_bits(dapm, mc->rreg,
3229                                                          mask << mc->rshift,
3230                                                          rval);
3231         }
3232 
3233         if (change || reg_change) {
3234                 if (reg_change) {
3235                         if (snd_soc_volsw_is_stereo(mc)) {
3236                                 update.has_second_set = true;
3237                                 update.reg2 = mc->rreg;
3238                                 update.mask2 = mask << mc->rshift;
3239                                 update.val2 = rval;
3240                         }
3241                         update.kcontrol = kcontrol;
3242                         update.reg = reg;
3243                         update.mask = mask << shift;
3244                         update.val = val;
3245                         card->update = &update;
3246                 }
3247                 change |= reg_change;
3248 
3249                 ret = soc_dapm_mixer_update_power(card, kcontrol, connect,
3250                                                   rconnect);
3251 
3252                 card->update = NULL;
3253         }
3254 
3255         mutex_unlock(&card->dapm_mutex);
3256 
3257         if (ret > 0)
3258                 soc_dpcm_runtime_update(card);
3259 
3260         return change;
3261 }
3262 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);
3263 
3264 /**
3265  * snd_soc_dapm_get_enum_double - dapm enumerated double mixer get callback
3266  * @kcontrol: mixer control
3267  * @ucontrol: control element information
3268  *
3269  * Callback to get the value of a dapm enumerated double mixer control.
3270  *
3271  * Returns 0 for success.
3272  */
3273 int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
3274         struct snd_ctl_elem_value *ucontrol)
3275 {
3276         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
3277         struct snd_soc_card *card = dapm->card;
3278         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
3279         unsigned int reg_val, val;
3280 
3281         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3282         if (e->reg != SND_SOC_NOPM && dapm_kcontrol_is_powered(kcontrol)) {
3283                 int ret = soc_dapm_read(dapm, e->reg, &reg_val);
3284                 if (ret) {
3285                         mutex_unlock(&card->dapm_mutex);
3286                         return ret;
3287                 }
3288         } else {
3289                 reg_val = dapm_kcontrol_get_value(kcontrol);
3290         }
3291         mutex_unlock(&card->dapm_mutex);
3292 
3293         val = (reg_val >> e->shift_l) & e->mask;
3294         ucontrol->value.enumerated.item[0] = snd_soc_enum_val_to_item(e, val);
3295         if (e->shift_l != e->shift_r) {
3296                 val = (reg_val >> e->shift_r) & e->mask;
3297                 val = snd_soc_enum_val_to_item(e, val);
3298                 ucontrol->value.enumerated.item[1] = val;
3299         }
3300 
3301         return 0;
3302 }
3303 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);
3304 
3305 /**
3306  * snd_soc_dapm_put_enum_double - dapm enumerated double mixer set callback
3307  * @kcontrol: mixer control
3308  * @ucontrol: control element information
3309  *
3310  * Callback to set the value of a dapm enumerated double mixer control.
3311  *
3312  * Returns 0 for success.
3313  */
3314 int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
3315         struct snd_ctl_elem_value *ucontrol)
3316 {
3317         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
3318         struct snd_soc_card *card = dapm->card;
3319         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
3320         unsigned int *item = ucontrol->value.enumerated.item;
3321         unsigned int val, change, reg_change = 0;
3322         unsigned int mask;
3323         struct snd_soc_dapm_update update = {};
3324         int ret = 0;
3325 
3326         if (item[0] >= e->items)
3327                 return -EINVAL;
3328 
3329         val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l;
3330         mask = e->mask << e->shift_l;
3331         if (e->shift_l != e->shift_r) {
3332                 if (item[1] > e->items)
3333                         return -EINVAL;
3334                 val |= snd_soc_enum_item_to_val(e, item[1]) << e->shift_r;
3335                 mask |= e->mask << e->shift_r;
3336         }
3337 
3338         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3339 
3340         change = dapm_kcontrol_set_value(kcontrol, val);
3341 
3342         if (e->reg != SND_SOC_NOPM)
3343                 reg_change = soc_dapm_test_bits(dapm, e->reg, mask, val);
3344 
3345         if (change || reg_change) {
3346                 if (reg_change) {
3347                         update.kcontrol = kcontrol;
3348                         update.reg = e->reg;
3349                         update.mask = mask;
3350                         update.val = val;
3351                         card->update = &update;
3352                 }
3353                 change |= reg_change;
3354 
3355                 ret = soc_dapm_mux_update_power(card, kcontrol, item[0], e);
3356 
3357                 card->update = NULL;
3358         }
3359 
3360         mutex_unlock(&card->dapm_mutex);
3361 
3362         if (ret > 0)
3363                 soc_dpcm_runtime_update(card);
3364 
3365         return change;
3366 }
3367 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
3368 
3369 /**
3370  * snd_soc_dapm_info_pin_switch - Info for a pin switch
3371  *
3372  * @kcontrol: mixer control
3373  * @uinfo: control element information
3374  *
3375  * Callback to provide information about a pin switch control.
3376  */
3377 int snd_soc_dapm_info_pin_switch(struct snd_kcontrol *kcontrol,
3378                                  struct snd_ctl_elem_info *uinfo)
3379 {
3380         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
3381         uinfo->count = 1;
3382         uinfo->value.integer.min = 0;
3383         uinfo->value.integer.max = 1;
3384 
3385         return 0;
3386 }
3387 EXPORT_SYMBOL_GPL(snd_soc_dapm_info_pin_switch);
3388 
3389 /**
3390  * snd_soc_dapm_get_pin_switch - Get information for a pin switch
3391  *
3392  * @kcontrol: mixer control
3393  * @ucontrol: Value
3394  */
3395 int snd_soc_dapm_get_pin_switch(struct snd_kcontrol *kcontrol,
3396                                 struct snd_ctl_elem_value *ucontrol)
3397 {
3398         struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
3399         const char *pin = (const char *)kcontrol->private_value;
3400 
3401         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3402 
3403         ucontrol->value.integer.value[0] =
3404                 snd_soc_dapm_get_pin_status(&card->dapm, pin);
3405 
3406         mutex_unlock(&card->dapm_mutex);
3407 
3408         return 0;
3409 }
3410 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_switch);
3411 
3412 /**
3413  * snd_soc_dapm_put_pin_switch - Set information for a pin switch
3414  *
3415  * @kcontrol: mixer control
3416  * @ucontrol: Value
3417  */
3418 int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
3419                                 struct snd_ctl_elem_value *ucontrol)
3420 {
3421         struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
3422         const char *pin = (const char *)kcontrol->private_value;
3423 
3424         if (ucontrol->value.integer.value[0])
3425                 snd_soc_dapm_enable_pin(&card->dapm, pin);
3426         else
3427                 snd_soc_dapm_disable_pin(&card->dapm, pin);
3428 
3429         snd_soc_dapm_sync(&card->dapm);
3430         return 0;
3431 }
3432 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
3433 
3434 struct snd_soc_dapm_widget *
3435 snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
3436         const struct snd_soc_dapm_widget *widget)
3437 {
3438         struct snd_soc_dapm_widget *w;
3439 
3440         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3441         w = snd_soc_dapm_new_control_unlocked(dapm, widget);
3442         /* Do not nag about probe deferrals */
3443         if (IS_ERR(w)) {
3444                 int ret = PTR_ERR(w);
3445 
3446                 if (ret != -EPROBE_DEFER)
3447                         dev_err(dapm->dev,
3448                                 "ASoC: Failed to create DAPM control %s (%d)\n",
3449                                 widget->name, ret);
3450                 goto out_unlock;
3451         }
3452         if (!w)
3453                 dev_err(dapm->dev,
3454                         "ASoC: Failed to create DAPM control %s\n",
3455                         widget->name);
3456 
3457 out_unlock:
3458         mutex_unlock(&dapm->card->dapm_mutex);
3459         return w;
3460 }
3461 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_control);
3462 
3463 struct snd_soc_dapm_widget *
3464 snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
3465                          const struct snd_soc_dapm_widget *widget)
3466 {
3467         enum snd_soc_dapm_direction dir;
3468         struct snd_soc_dapm_widget *w;
3469         const char *prefix;
3470         int ret;
3471 
3472         if ((w = dapm_cnew_widget(widget)) == NULL)
3473                 return NULL;
3474 
3475         switch (w->id) {
3476         case snd_soc_dapm_regulator_supply:
3477                 w->regulator = devm_regulator_get(dapm->dev, w->name);
3478                 if (IS_ERR(w->regulator)) {
3479                         ret = PTR_ERR(w->regulator);
3480                         if (ret == -EPROBE_DEFER)
3481                                 return ERR_PTR(ret);
3482                         dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
3483                                 w->name, ret);
3484                         return NULL;
3485                 }
3486 
3487                 if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
3488                         ret = regulator_allow_bypass(w->regulator, true);
3489                         if (ret != 0)
3490                                 dev_warn(w->dapm->dev,
3491                                          "ASoC: Failed to bypass %s: %d\n",
3492                                          w->name, ret);
3493                 }
3494                 break;
3495         case snd_soc_dapm_pinctrl:
3496                 w->pinctrl = devm_pinctrl_get(dapm->dev);
3497                 if (IS_ERR_OR_NULL(w->pinctrl)) {
3498                         ret = PTR_ERR(w->pinctrl);
3499                         if (ret == -EPROBE_DEFER)
3500                                 return ERR_PTR(ret);
3501                         dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
3502                                 w->name, ret);
3503                         return NULL;
3504                 }
3505                 break;
3506         case snd_soc_dapm_clock_supply:
3507 #ifdef CONFIG_CLKDEV_LOOKUP
3508                 w->clk = devm_clk_get(dapm->dev, w->name);
3509                 if (IS_ERR(w->clk)) {
3510                         ret = PTR_ERR(w->clk);
3511                         if (ret == -EPROBE_DEFER)
3512                                 return ERR_PTR(ret);
3513                         dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
3514                                 w->name, ret);
3515                         return NULL;
3516                 }
3517 #else
3518                 return NULL;
3519 #endif
3520                 break;
3521         default:
3522                 break;
3523         }
3524 
3525         prefix = soc_dapm_prefix(dapm);
3526         if (prefix)
3527                 w->name = kasprintf(GFP_KERNEL, "%s %s", prefix, widget->name);
3528         else
3529                 w->name = kstrdup_const(widget->name, GFP_KERNEL);
3530         if (w->name == NULL) {
3531                 kfree(w);
3532                 return NULL;
3533         }
3534 
3535         switch (w->id) {
3536         case snd_soc_dapm_mic:
3537                 w->is_ep = SND_SOC_DAPM_EP_SOURCE;
3538                 w->power_check = dapm_generic_check_power;
3539                 break;
3540         case snd_soc_dapm_input:
3541                 if (!dapm->card->fully_routed)
3542                         w->is_ep = SND_SOC_DAPM_EP_SOURCE;
3543                 w->power_check = dapm_generic_check_power;
3544                 break;
3545         case snd_soc_dapm_spk:
3546         case snd_soc_dapm_hp:
3547                 w->is_ep = SND_SOC_DAPM_EP_SINK;
3548                 w->power_check = dapm_generic_check_power;
3549                 break;
3550         case snd_soc_dapm_output:
3551                 if (!dapm->card->fully_routed)
3552                         w->is_ep = SND_SOC_DAPM_EP_SINK;
3553                 w->power_check = dapm_generic_check_power;
3554                 break;
3555         case snd_soc_dapm_vmid:
3556         case snd_soc_dapm_siggen:
3557                 w->is_ep = SND_SOC_DAPM_EP_SOURCE;
3558                 w->power_check = dapm_always_on_check_power;
3559                 break;
3560         case snd_soc_dapm_sink:
3561                 w->is_ep = SND_SOC_DAPM_EP_SINK;
3562                 w->power_check = dapm_always_on_check_power;
3563                 break;
3564 
3565         case snd_soc_dapm_mux:
3566         case snd_soc_dapm_demux:
3567         case snd_soc_dapm_switch:
3568         case snd_soc_dapm_mixer:
3569         case snd_soc_dapm_mixer_named_ctl:
3570         case snd_soc_dapm_adc:
3571         case snd_soc_dapm_aif_out:
3572         case snd_soc_dapm_dac:
3573         case snd_soc_dapm_aif_in:
3574         case snd_soc_dapm_pga:
3575         case snd_soc_dapm_out_drv:
3576         case snd_soc_dapm_micbias:
3577         case snd_soc_dapm_line:
3578         case snd_soc_dapm_dai_link:
3579         case snd_soc_dapm_dai_out:
3580         case snd_soc_dapm_dai_in:
3581                 w->power_check = dapm_generic_check_power;
3582                 break;
3583         case snd_soc_dapm_supply:
3584         case snd_soc_dapm_regulator_supply:
3585         case snd_soc_dapm_pinctrl:
3586         case snd_soc_dapm_clock_supply:
3587         case snd_soc_dapm_kcontrol:
3588                 w->is_supply = 1;
3589                 w->power_check = dapm_supply_check_power;
3590                 break;
3591         default:
3592                 w->power_check = dapm_always_on_check_power;
3593                 break;
3594         }
3595 
3596         w->dapm = dapm;
3597         INIT_LIST_HEAD(&w->list);
3598         INIT_LIST_HEAD(&w->dirty);
3599         list_add_tail(&w->list, &dapm->card->widgets);
3600 
3601         snd_soc_dapm_for_each_direction(dir) {
3602                 INIT_LIST_HEAD(&w->edges[dir]);
3603                 w->endpoints[dir] = -1;
3604         }
3605 
3606         /* machine layer sets up unconnected pins and insertions */
3607         w->connected = 1;
3608         return w;
3609 }
3610 
3611 /**
3612  * snd_soc_dapm_new_controls - create new dapm controls
3613  * @dapm: DAPM context
3614  * @widget: widget array
3615  * @num: number of widgets
3616  *
3617  * Creates new DAPM controls based upon the templates.
3618  *
3619  * Returns 0 for success else error.
3620  */
3621 int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
3622         const struct snd_soc_dapm_widget *widget,
3623         int num)
3624 {
3625         struct snd_soc_dapm_widget *w;
3626         int i;
3627         int ret = 0;
3628 
3629         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
3630         for (i = 0; i < num; i++) {
3631                 w = snd_soc_dapm_new_control_unlocked(dapm, widget);
3632                 if (IS_ERR(w)) {
3633                         ret = PTR_ERR(w);
3634                         /* Do not nag about probe deferrals */
3635                         if (ret == -EPROBE_DEFER)
3636                                 break;
3637                         dev_err(dapm->dev,
3638                                 "ASoC: Failed to create DAPM control %s (%d)\n",
3639                                 widget->name, ret);
3640                         break;
3641                 }
3642                 if (!w) {
3643                         dev_err(dapm->dev,
3644                                 "ASoC: Failed to create DAPM control %s\n",
3645                                 widget->name);
3646                         ret = -ENOMEM;
3647                         break;
3648                 }
3649                 widget++;
3650         }
3651         mutex_unlock(&dapm->card->dapm_mutex);
3652         return ret;
3653 }
3654 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);
3655 
3656 static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
3657                                   struct snd_kcontrol *kcontrol, int event)
3658 {
3659         struct snd_soc_dapm_path *source_p, *sink_p;
3660         struct snd_soc_dai *source, *sink;
3661         struct snd_soc_pcm_runtime *rtd = w->priv;
3662         const struct snd_soc_pcm_stream *config = w->params + w->params_select;
3663         struct snd_pcm_substream substream;
3664         struct snd_pcm_hw_params *params = NULL;
3665         struct snd_pcm_runtime *runtime = NULL;
3666         u64 fmt;
3667         int ret;
3668 
3669         if (WARN_ON(!config) ||
3670             WARN_ON(list_empty(&w->edges[SND_SOC_DAPM_DIR_OUT]) ||
3671                     list_empty(&w->edges[SND_SOC_DAPM_DIR_IN])))
3672                 return -EINVAL;
3673 
3674         /* We only support a single source and sink, pick the first */
3675         source_p = list_first_entry(&w->edges[SND_SOC_DAPM_DIR_OUT],
3676                                     struct snd_soc_dapm_path,
3677                                     list_node[SND_SOC_DAPM_DIR_OUT]);
3678         sink_p = list_first_entry(&w->edges[SND_SOC_DAPM_DIR_IN],
3679                                     struct snd_soc_dapm_path,
3680                                     list_node[SND_SOC_DAPM_DIR_IN]);
3681 
3682         source = source_p->source->priv;
3683         sink = sink_p->sink->priv;
3684 
3685         /* Be a little careful as we don't want to overflow the mask array */
3686         if (config->formats) {
3687                 fmt = ffs(config->formats) - 1;
3688         } else {
3689                 dev_warn(w->dapm->dev, "ASoC: Invalid format %llx specified\n",
3690                          config->formats);
3691                 fmt = 0;
3692         }
3693 
3694         /* Currently very limited parameter selection */
3695         params = kzalloc(sizeof(*params), GFP_KERNEL);
3696         if (!params) {
3697                 ret = -ENOMEM;
3698                 goto out;
3699         }
3700         snd_mask_set(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
3701 
3702         hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->min =
3703                 config->rate_min;
3704         hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->max =
3705                 config->rate_max;
3706 
3707         hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->min
3708                 = config->channels_min;
3709         hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->max
3710                 = config->channels_max;
3711 
3712         memset(&substream, 0, sizeof(substream));
3713 
3714         /* Allocate a dummy snd_pcm_runtime for startup() and other ops() */
3715         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
3716         if (!runtime) {
3717                 ret = -ENOMEM;
3718                 goto out;
3719         }
3720         substream.runtime = runtime;
3721         substream.private_data = rtd;
3722 
3723         switch (event) {
3724         case SND_SOC_DAPM_PRE_PMU:
3725                 substream.stream = SNDRV_PCM_STREAM_CAPTURE;
3726                 if (source->driver->ops->startup) {
3727                         ret = source->driver->ops->startup(&substream, source);
3728                         if (ret < 0) {
3729                                 dev_err(source->dev,
3730                                         "ASoC: startup() failed: %d\n", ret);
3731                                 goto out;
3732                         }
3733                         source->active++;
3734                 }
3735                 ret = soc_dai_hw_params(&substream, params, source);
3736                 if (ret < 0)
3737                         goto out;
3738 
3739                 substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
3740                 if (sink->driver->ops->startup) {
3741                         ret = sink->driver->ops->startup(&substream, sink);
3742                         if (ret < 0) {
3743                                 dev_err(sink->dev,
3744                                         "ASoC: startup() failed: %d\n", ret);
3745                                 goto out;
3746                         }
3747                         sink->active++;
3748                 }
3749                 ret = soc_dai_hw_params(&substream, params, sink);
3750                 if (ret < 0)
3751                         goto out;
3752                 break;
3753 
3754         case SND_SOC_DAPM_POST_PMU:
3755                 ret = snd_soc_dai_digital_mute(sink, 0,
3756                                                SNDRV_PCM_STREAM_PLAYBACK);
3757                 if (ret != 0 && ret != -ENOTSUPP)
3758                         dev_warn(sink->dev, "ASoC: Failed to unmute: %d\n", ret);
3759                 ret = 0;
3760                 break;
3761 
3762         case SND_SOC_DAPM_PRE_PMD:
3763                 ret = snd_soc_dai_digital_mute(sink, 1,
3764                                                SNDRV_PCM_STREAM_PLAYBACK);
3765                 if (ret != 0 && ret != -ENOTSUPP)
3766                         dev_warn(sink->dev, "ASoC: Failed to mute: %d\n", ret);
3767                 ret = 0;
3768 
3769                 source->active--;
3770                 if (source->driver->ops->shutdown) {
3771                         substream.stream = SNDRV_PCM_STREAM_CAPTURE;
3772                         source->driver->ops->shutdown(&substream, source);
3773                 }
3774 
3775                 sink->active--;
3776                 if (sink->driver->ops->shutdown) {
3777                         substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
3778                         sink->driver->ops->shutdown(&substream, sink);
3779                 }
3780                 break;
3781 
3782         default:
3783                 WARN(1, "Unknown event %d\n", event);
3784                 ret = -EINVAL;
3785         }
3786 
3787 out:
3788         kfree(runtime);
3789         kfree(params);
3790         return ret;
3791 }
3792 
3793 static int snd_soc_dapm_dai_link_get(struct snd_kcontrol *kcontrol,
3794                           struct snd_ctl_elem_value *ucontrol)
3795 {
3796         struct snd_soc_dapm_widget *w = snd_kcontrol_chip(kcontrol);
3797 
3798         ucontrol->value.enumerated.item[0] = w->params_select;
3799 
3800         return 0;
3801 }
3802 
3803 static int snd_soc_dapm_dai_link_put(struct snd_kcontrol *kcontrol,
3804                           struct snd_ctl_elem_value *ucontrol)
3805 {
3806         struct snd_soc_dapm_widget *w = snd_kcontrol_chip(kcontrol);
3807 
3808         /* Can't change the config when widget is already powered */
3809         if (w->power)
3810                 return -EBUSY;
3811 
3812         if (ucontrol->value.enumerated.item[0] == w->params_select)
3813                 return 0;
3814 
3815         if (ucontrol->value.enumerated.item[0] >= w->num_params)
3816                 return -EINVAL;
3817 
3818         w->params_select = ucontrol->value.enumerated.item[0];
3819 
3820         return 0;
3821 }
3822 
3823 static void
3824 snd_soc_dapm_free_kcontrol(struct snd_soc_card *card,
3825                         unsigned long *private_value,
3826                         int num_params,
3827                         const char **w_param_text)
3828 {
3829         int count;
3830 
3831         devm_kfree(card->dev, (void *)*private_value);
3832         for (count = 0 ; count < num_params; count++)
3833                 devm_kfree(card->dev, (void *)w_param_text[count]);
3834         devm_kfree(card->dev, w_param_text);
3835 }
3836 
3837 static struct snd_kcontrol_new *
3838 snd_soc_dapm_alloc_kcontrol(struct snd_soc_card *card,
3839                         char *link_name,
3840                         const struct snd_soc_pcm_stream *params,
3841                         int num_params, const char **w_param_text,
3842                         unsigned long *private_value)
3843 {
3844         struct soc_enum w_param_enum[] = {
3845                 SOC_ENUM_SINGLE(0, 0, 0, NULL),
3846         };
3847         struct snd_kcontrol_new kcontrol_dai_link[] = {
3848                 SOC_ENUM_EXT(NULL, w_param_enum[0],
3849                              snd_soc_dapm_dai_link_get,
3850                              snd_soc_dapm_dai_link_put),
3851         };
3852         struct snd_kcontrol_new *kcontrol_news;
3853         const struct snd_soc_pcm_stream *config = params;
3854         int count;
3855 
3856         for (count = 0 ; count < num_params; count++) {
3857                 if (!config->stream_name) {
3858                         dev_warn(card->dapm.dev,
3859                                 "ASoC: anonymous config %d for dai link %s\n",
3860                                 count, link_name);
3861                         w_param_text[count] =
3862                                 devm_kasprintf(card->dev, GFP_KERNEL,
3863                                                "Anonymous Configuration %d",
3864                                                count);
3865                 } else {
3866                         w_param_text[count] = devm_kmemdup(card->dev,
3867                                                 config->stream_name,
3868                                                 strlen(config->stream_name) + 1,
3869                                                 GFP_KERNEL);
3870                 }
3871                 if (!w_param_text[count])
3872                         goto outfree_w_param;
3873                 config++;
3874         }
3875 
3876         w_param_enum[0].items = num_params;
3877         w_param_enum[0].texts = w_param_text;
3878 
3879         *private_value =
3880                 (unsigned long) devm_kmemdup(card->dev,
3881                         (void *)(kcontrol_dai_link[0].private_value),
3882                         sizeof(struct soc_enum), GFP_KERNEL);
3883         if (!*private_value) {
3884                 dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
3885                         link_name);
3886                 goto outfree_w_param;
3887         }
3888         kcontrol_dai_link[0].private_value = *private_value;
3889         /* duplicate kcontrol_dai_link on heap so that memory persists */
3890         kcontrol_news = devm_kmemdup(card->dev, &kcontrol_dai_link[0],
3891                                         sizeof(struct snd_kcontrol_new),
3892                                         GFP_KERNEL);
3893         if (!kcontrol_news) {
3894                 dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
3895                         link_name);
3896                 goto outfree_w_param;
3897         }
3898         return kcontrol_news;
3899 
3900 outfree_w_param:
3901         snd_soc_dapm_free_kcontrol(card, private_value, num_params, w_param_text);
3902         return NULL;
3903 }
3904 
3905 int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
3906                          struct snd_soc_pcm_runtime *rtd,
3907                          const struct snd_soc_pcm_stream *params,
3908                          unsigned int num_params,
3909                          struct snd_soc_dapm_widget *source,
3910                          struct snd_soc_dapm_widget *sink)
3911 {
3912         struct snd_soc_dapm_widget template;
3913         struct snd_soc_dapm_widget *w;
3914         const char **w_param_text;
3915         unsigned long private_value;
3916         char *link_name;
3917         int ret;
3918 
3919         link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s",
3920                                    source->name, sink->name);
3921         if (!link_name)
3922                 return -ENOMEM;
3923 
3924         memset(&template, 0, sizeof(template));
3925         template.reg = SND_SOC_NOPM;
3926         template.id = snd_soc_dapm_dai_link;
3927         template.name = link_name;
3928         template.event = snd_soc_dai_link_event;
3929         template.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
3930                 SND_SOC_DAPM_PRE_PMD;
3931         template.kcontrol_news = NULL;
3932 
3933         /* allocate memory for control, only in case of multiple configs */
3934         if (num_params > 1) {
3935                 w_param_text = devm_kcalloc(card->dev, num_params,
3936                                         sizeof(char *), GFP_KERNEL);
3937                 if (!w_param_text) {
3938                         ret = -ENOMEM;
3939                         goto param_fail;
3940                 }
3941 
3942                 template.num_kcontrols = 1;
3943                 template.kcontrol_news =
3944                                         snd_soc_dapm_alloc_kcontrol(card,
3945                                                 link_name, params, num_params,
3946                                                 w_param_text, &private_value);
3947                 if (!template.kcontrol_news) {
3948                         ret = -ENOMEM;
3949                         goto param_fail;
3950                 }
3951         } else {
3952                 w_param_text = NULL;
3953         }
3954         dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
3955 
3956         w = snd_soc_dapm_new_control_unlocked(&card->dapm, &template);
3957         if (IS_ERR(w)) {
3958                 ret = PTR_ERR(w);
3959                 /* Do not nag about probe deferrals */
3960                 if (ret != -EPROBE_DEFER)
3961                         dev_err(card->dev,
3962                                 "ASoC: Failed to create %s widget (%d)\n",
3963                                 link_name, ret);
3964                 goto outfree_kcontrol_news;
3965         }
3966         if (!w) {
3967                 dev_err(card->dev, "ASoC: Failed to create %s widget\n",
3968                         link_name);
3969                 ret = -ENOMEM;
3970                 goto outfree_kcontrol_news;
3971         }
3972 
3973         w->params = params;
3974         w->num_params = num_params;
3975         w->priv = rtd;
3976 
3977         ret = snd_soc_dapm_add_path(&card->dapm, source, w, NULL, NULL);
3978         if (ret)
3979                 goto outfree_w;
3980         return snd_soc_dapm_add_path(&card->dapm, w, sink, NULL, NULL);
3981 
3982 outfree_w:
3983         devm_kfree(card->dev, w);
3984 outfree_kcontrol_news:
3985         devm_kfree(card->dev, (void *)template.kcontrol_news);
3986         snd_soc_dapm_free_kcontrol(card, &private_value, num_params, w_param_text);
3987 param_fail:
3988         devm_kfree(card->dev, link_name);
3989         return ret;
3990 }
3991 
3992 int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm,
3993                                  struct snd_soc_dai *dai)
3994 {
3995         struct snd_soc_dapm_widget template;
3996         struct snd_soc_dapm_widget *w;
3997 
3998         WARN_ON(dapm->dev != dai->dev);
3999 
4000         memset(&template, 0, sizeof(template));
4001         template.reg = SND_SOC_NOPM;
4002 
4003         if (dai->driver->playback.stream_name) {
4004                 template.id = snd_soc_dapm_dai_in;
4005                 template.name = dai->driver->playback.stream_name;
4006                 template.sname = dai->driver->playback.stream_name;
4007 
4008                 dev_dbg(dai->dev, "ASoC: adding %s widget\n",
4009                         template.name);
4010 
4011                 w = snd_soc_dapm_new_control_unlocked(dapm, &template);
4012                 if (IS_ERR(w)) {
4013                         int ret = PTR_ERR(w);
4014 
4015                         /* Do not nag about probe deferrals */
4016                         if (ret != -EPROBE_DEFER)
4017                                 dev_err(dapm->dev,
4018                                 "ASoC: Failed to create %s widget (%d)\n",
4019                                 dai->driver->playback.stream_name, ret);
4020                         return ret;
4021                 }
4022                 if (!w) {
4023                         dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
4024                                 dai->driver->playback.stream_name);
4025                         return -ENOMEM;
4026                 }
4027 
4028                 w->priv = dai;
4029                 dai->playback_widget = w;
4030         }
4031 
4032         if (dai->driver->capture.stream_name) {
4033                 template.id = snd_soc_dapm_dai_out;
4034                 template.name = dai->driver->capture.stream_name;
4035                 template.sname = dai->driver->capture.stream_name;
4036 
4037                 dev_dbg(dai->dev, "ASoC: adding %s widget\n",
4038                         template.name);
4039 
4040                 w = snd_soc_dapm_new_control_unlocked(dapm, &template);
4041                 if (IS_ERR(w)) {
4042                         int ret = PTR_ERR(w);
4043 
4044                         /* Do not nag about probe deferrals */
4045                         if (ret != -EPROBE_DEFER)
4046                                 dev_err(dapm->dev,
4047                                 "ASoC: Failed to create %s widget (%d)\n",
4048                                 dai->driver->playback.stream_name, ret);
4049                         return ret;
4050                 }
4051                 if (!w) {
4052                         dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
4053                                 dai->driver->capture.stream_name);
4054                         return -ENOMEM;
4055                 }
4056 
4057                 w->priv = dai;
4058                 dai->capture_widget = w;
4059         }
4060 
4061         return 0;
4062 }
4063 
4064 int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card)
4065 {
4066         struct snd_soc_dapm_widget *dai_w, *w;
4067         struct snd_soc_dapm_widget *src, *sink;
4068         struct snd_soc_dai *dai;
4069 
4070         /* For each DAI widget... */
4071         list_for_each_entry(dai_w, &card->widgets, list) {
4072                 switch (dai_w->id) {
4073                 case snd_soc_dapm_dai_in:
4074                 case snd_soc_dapm_dai_out:
4075                         break;
4076                 default:
4077                         continue;
4078                 }
4079 
4080                 /* let users know there is no DAI to link */
4081                 if (!dai_w->priv) {
4082                         dev_dbg(card->dev, "dai widget %s has no DAI\n",
4083                                 dai_w->name);
4084                         continue;
4085                 }
4086 
4087                 dai = dai_w->priv;
4088 
4089                 /* ...find all widgets with the same stream and link them */
4090                 list_for_each_entry(w, &card->widgets, list) {
4091                         if (w->dapm != dai_w->dapm)
4092                                 continue;
4093 
4094                         switch (w->id) {
4095                         case snd_soc_dapm_dai_in:
4096                         case snd_soc_dapm_dai_out:
4097                                 continue;
4098                         default:
4099                                 break;
4100                         }
4101 
4102                         if (!w->sname || !strstr(w->sname, dai_w->sname))
4103                                 continue;
4104 
4105                         if (dai_w->id == snd_soc_dapm_dai_in) {
4106                                 src = dai_w;
4107                                 sink = w;
4108                         } else {
4109                                 src = w;
4110                                 sink = dai_w;
4111                         }
4112                         dev_dbg(dai->dev, "%s -> %s\n", src->name, sink->name);
4113                         snd_soc_dapm_add_path(w->dapm, src, sink, NULL, NULL);
4114                 }
4115         }
4116 
4117         return 0;
4118 }
4119 
4120 static void dapm_connect_dai_link_widgets(struct snd_soc_card *card,
4121                                           struct snd_soc_pcm_runtime *rtd)
4122 {
4123         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
4124         struct snd_soc_dapm_widget *sink, *source;
4125         int i;
4126 
4127         for (i = 0; i < rtd->num_codecs; i++) {
4128                 struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
4129 
4130                 /* connect BE DAI playback if widgets are valid */
4131                 if (codec_dai->playback_widget && cpu_dai->playback_widget) {
4132                         source = cpu_dai->playback_widget;
4133                         sink = codec_dai->playback_widget;
4134                         dev_dbg(rtd->dev, "connected DAI link %s:%s -> %s:%s\n",
4135                                 cpu_dai->component->name, source->name,
4136                                 codec_dai->component->name, sink->name);
4137 
4138                         snd_soc_dapm_add_path(&card->dapm, source, sink,
4139                                 NULL, NULL);
4140                 }
4141 
4142                 /* connect BE DAI capture if widgets are valid */
4143                 if (codec_dai->capture_widget && cpu_dai->capture_widget) {
4144                         source = codec_dai->capture_widget;
4145                         sink = cpu_dai->capture_widget;
4146                         dev_dbg(rtd->dev, "connected DAI link %s:%s -> %s:%s\n",
4147                                 codec_dai->component->name, source->name,
4148                                 cpu_dai->component->name, sink->name);
4149 
4150                         snd_soc_dapm_add_path(&card->dapm, source, sink,
4151                                 NULL, NULL);
4152                 }
4153         }
4154 }
4155 
4156 static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
4157         int event)
4158 {
4159         struct snd_soc_dapm_widget *w;
4160         unsigned int ep;
4161 
4162         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
4163                 w = dai->playback_widget;
4164         else
4165                 w = dai->capture_widget;
4166 
4167         if (w) {
4168                 dapm_mark_dirty(w, "stream event");
4169 
4170                 if (w->id == snd_soc_dapm_dai_in) {
4171                         ep = SND_SOC_DAPM_EP_SOURCE;
4172                         dapm_widget_invalidate_input_paths(w);
4173                 } else {
4174                         ep = SND_SOC_DAPM_EP_SINK;
4175                         dapm_widget_invalidate_output_paths(w);
4176                 }
4177 
4178                 switch (event) {
4179                 case SND_SOC_DAPM_STREAM_START:
4180                         w->active = 1;
4181                         w->is_ep = ep;
4182                         break;
4183                 case SND_SOC_DAPM_STREAM_STOP:
4184                         w->active = 0;
4185                         w->is_ep = 0;
4186                         break;
4187                 case SND_SOC_DAPM_STREAM_SUSPEND:
4188                 case SND_SOC_DAPM_STREAM_RESUME:
4189                 case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
4190                 case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
4191                         break;
4192                 }
4193         }
4194 }
4195 
4196 void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card)
4197 {
4198         struct snd_soc_pcm_runtime *rtd;
4199 
4200         /* for each BE DAI link... */
4201         list_for_each_entry(rtd, &card->rtd_list, list)  {
4202                 /*
4203                  * dynamic FE links have no fixed DAI mapping.
4204                  * CODEC<->CODEC links have no direct connection.
4205                  */
4206                 if (rtd->dai_link->dynamic || rtd->dai_link->params)
4207                         continue;
4208 
4209                 dapm_connect_dai_link_widgets(card, rtd);
4210         }
4211 }
4212 
4213 static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
4214         int event)
4215 {
4216         int i;
4217 
4218         soc_dapm_dai_stream_event(rtd->cpu_dai, stream, event);
4219         for (i = 0; i < rtd->num_codecs; i++)
4220                 soc_dapm_dai_stream_event(rtd->codec_dais[i], stream, event);
4221 
4222         dapm_power_widgets(rtd->card, event);
4223 }
4224 
4225 /**
4226  * snd_soc_dapm_stream_event - send a stream event to the dapm core
4227  * @rtd: PCM runtime data
4228  * @stream: stream name
4229  * @event: stream event
4230  *
4231  * Sends a stream event to the dapm core. The core then makes any
4232  * necessary widget power changes.
4233  *
4234  * Returns 0 for success else error.
4235  */
4236 void snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
4237                               int event)
4238 {
4239         struct snd_soc_card *card = rtd->card;
4240 
4241         mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
4242         soc_dapm_stream_event(rtd, stream, event);
4243         mutex_unlock(&card->dapm_mutex);
4244 }
4245 
4246 /**
4247  * snd_soc_dapm_enable_pin_unlocked - enable pin.
4248  * @dapm: DAPM context
4249  * @pin: pin name
4250  *
4251  * Enables input/output pin and its parents or children widgets iff there is
4252  * a valid audio route and active audio stream.
4253  *
4254  * Requires external locking.
4255  *
4256  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4257  * do any widget power switching.
4258  */
4259 int snd_soc_dapm_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
4260                                    const char *pin)
4261 {
4262         return snd_soc_dapm_set_pin(dapm, pin, 1);
4263 }
4264 EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin_unlocked);
4265 
4266 /**
4267  * snd_soc_dapm_enable_pin - enable pin.
4268  * @dapm: DAPM context
4269  * @pin: pin name
4270  *
4271  * Enables input/output pin and its parents or children widgets iff there is
4272  * a valid audio route and active audio stream.
4273  *
4274  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4275  * do any widget power switching.
4276  */
4277 int snd_soc_dapm_enable_pin(struct snd_soc_dapm_context *dapm, const char *pin)
4278 {
4279         int ret;
4280 
4281         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
4282 
4283         ret = snd_soc_dapm_set_pin(dapm, pin, 1);
4284 
4285         mutex_unlock(&dapm->card->dapm_mutex);
4286 
4287         return ret;
4288 }
4289 EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);
4290 
4291 /**
4292  * snd_soc_dapm_force_enable_pin_unlocked - force a pin to be enabled
4293  * @dapm: DAPM context
4294  * @pin: pin name
4295  *
4296  * Enables input/output pin regardless of any other state.  This is
4297  * intended for use with microphone bias supplies used in microphone
4298  * jack detection.
4299  *
4300  * Requires external locking.
4301  *
4302  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4303  * do any widget power switching.
4304  */
4305 int snd_soc_dapm_force_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
4306                                          const char *pin)
4307 {
4308         struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
4309 
4310         if (!w) {
4311                 dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
4312                 return -EINVAL;
4313         }
4314 
4315         dev_dbg(w->dapm->dev, "ASoC: force enable pin %s\n", pin);
4316         if (!w->connected) {
4317                 /*
4318                  * w->force does not affect the number of input or output paths,
4319                  * so we only have to recheck if w->connected is changed
4320                  */
4321                 dapm_widget_invalidate_input_paths(w);
4322                 dapm_widget_invalidate_output_paths(w);
4323                 w->connected = 1;
4324         }
4325         w->force = 1;
4326         dapm_mark_dirty(w, "force enable");
4327 
4328         return 0;
4329 }
4330 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin_unlocked);
4331 
4332 /**
4333  * snd_soc_dapm_force_enable_pin - force a pin to be enabled
4334  * @dapm: DAPM context
4335  * @pin: pin name
4336  *
4337  * Enables input/output pin regardless of any other state.  This is
4338  * intended for use with microphone bias supplies used in microphone
4339  * jack detection.
4340  *
4341  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4342  * do any widget power switching.
4343  */
4344 int snd_soc_dapm_force_enable_pin(struct snd_soc_dapm_context *dapm,
4345                                   const char *pin)
4346 {
4347         int ret;
4348 
4349         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
4350 
4351         ret = snd_soc_dapm_force_enable_pin_unlocked(dapm, pin);
4352 
4353         mutex_unlock(&dapm->card->dapm_mutex);
4354 
4355         return ret;
4356 }
4357 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin);
4358 
4359 /**
4360  * snd_soc_dapm_disable_pin_unlocked - disable pin.
4361  * @dapm: DAPM context
4362  * @pin: pin name
4363  *
4364  * Disables input/output pin and its parents or children widgets.
4365  *
4366  * Requires external locking.
4367  *
4368  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4369  * do any widget power switching.
4370  */
4371 int snd_soc_dapm_disable_pin_unlocked(struct snd_soc_dapm_context *dapm,
4372                                     const char *pin)
4373 {
4374         return snd_soc_dapm_set_pin(dapm, pin, 0);
4375 }
4376 EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin_unlocked);
4377 
4378 /**
4379  * snd_soc_dapm_disable_pin - disable pin.
4380  * @dapm: DAPM context
4381  * @pin: pin name
4382  *
4383  * Disables input/output pin and its parents or children widgets.
4384  *
4385  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4386  * do any widget power switching.
4387  */
4388 int snd_soc_dapm_disable_pin(struct snd_soc_dapm_context *dapm,
4389                              const char *pin)
4390 {
4391         int ret;
4392 
4393         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
4394 
4395         ret = snd_soc_dapm_set_pin(dapm, pin, 0);
4396 
4397         mutex_unlock(&dapm->card->dapm_mutex);
4398 
4399         return ret;
4400 }
4401 EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin);
4402 
4403 /**
4404  * snd_soc_dapm_nc_pin_unlocked - permanently disable pin.
4405  * @dapm: DAPM context
4406  * @pin: pin name
4407  *
4408  * Marks the specified pin as being not connected, disabling it along
4409  * any parent or child widgets.  At present this is identical to
4410  * snd_soc_dapm_disable_pin() but in future it will be extended to do
4411  * additional things such as disabling controls which only affect
4412  * paths through the pin.
4413  *
4414  * Requires external locking.
4415  *
4416  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4417  * do any widget power switching.
4418  */
4419 int snd_soc_dapm_nc_pin_unlocked(struct snd_soc_dapm_context *dapm,
4420                                const char *pin)
4421 {
4422         return snd_soc_dapm_set_pin(dapm, pin, 0);
4423 }
4424 EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin_unlocked);
4425 
4426 /**
4427  * snd_soc_dapm_nc_pin - permanently disable pin.
4428  * @dapm: DAPM context
4429  * @pin: pin name
4430  *
4431  * Marks the specified pin as being not connected, disabling it along
4432  * any parent or child widgets.  At present this is identical to
4433  * snd_soc_dapm_disable_pin() but in future it will be extended to do
4434  * additional things such as disabling controls which only affect
4435  * paths through the pin.
4436  *
4437  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4438  * do any widget power switching.
4439  */
4440 int snd_soc_dapm_nc_pin(struct snd_soc_dapm_context *dapm, const char *pin)
4441 {
4442         int ret;
4443 
4444         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
4445 
4446         ret = snd_soc_dapm_set_pin(dapm, pin, 0);
4447 
4448         mutex_unlock(&dapm->card->dapm_mutex);
4449 
4450         return ret;
4451 }
4452 EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin);
4453 
4454 /**
4455  * snd_soc_dapm_get_pin_status - get audio pin status
4456  * @dapm: DAPM context
4457  * @pin: audio signal pin endpoint (or start point)
4458  *
4459  * Get audio pin status - connected or disconnected.
4460  *
4461  * Returns 1 for connected otherwise 0.
4462  */
4463 int snd_soc_dapm_get_pin_status(struct snd_soc_dapm_context *dapm,
4464                                 const char *pin)
4465 {
4466         struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
4467 
4468         if (w)
4469                 return w->connected;
4470 
4471         return 0;
4472 }
4473 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_status);
4474 
4475 /**
4476  * snd_soc_dapm_ignore_suspend - ignore suspend status for DAPM endpoint
4477  * @dapm: DAPM context
4478  * @pin: audio signal pin endpoint (or start point)
4479  *
4480  * Mark the given endpoint or pin as ignoring suspend.  When the
4481  * system is disabled a path between two endpoints flagged as ignoring
4482  * suspend will not be disabled.  The path must already be enabled via
4483  * normal means at suspend time, it will not be turned on if it was not
4484  * already enabled.
4485  */
4486 int snd_soc_dapm_ignore_suspend(struct snd_soc_dapm_context *dapm,
4487                                 const char *pin)
4488 {
4489         struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, false);
4490 
4491         if (!w) {
4492                 dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
4493                 return -EINVAL;
4494         }
4495 
4496         w->ignore_suspend = 1;
4497 
4498         return 0;
4499 }
4500 EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);
4501 
4502 /**
4503  * snd_soc_dapm_free - free dapm resources
4504  * @dapm: DAPM context
4505  *
4506  * Free all dapm widgets and resources.
4507  */
4508 void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
4509 {
4510         dapm_debugfs_cleanup(dapm);
4511         dapm_free_widgets(dapm);
4512         list_del(&dapm->list);
4513 }
4514 EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
4515 
4516 static void soc_dapm_shutdown_dapm(struct snd_soc_dapm_context *dapm)
4517 {
4518         struct snd_soc_card *card = dapm->card;
4519         struct snd_soc_dapm_widget *w;
4520         LIST_HEAD(down_list);
4521         int powerdown = 0;
4522 
4523         mutex_lock(&card->dapm_mutex);
4524 
4525         list_for_each_entry(w, &dapm->card->widgets, list) {
4526                 if (w->dapm != dapm)
4527                         continue;
4528                 if (w->power) {
4529                         dapm_seq_insert(w, &down_list, false);
4530                         w->power = 0;
4531                         powerdown = 1;
4532                 }
4533         }
4534 
4535         /* If there were no widgets to power down we're already in
4536          * standby.
4537          */
4538         if (powerdown) {
4539                 if (dapm->bias_level == SND_SOC_BIAS_ON)
4540                         snd_soc_dapm_set_bias_level(dapm,
4541                                                     SND_SOC_BIAS_PREPARE);
4542                 dapm_seq_run(card, &down_list, 0, false);
4543                 if (dapm->bias_level == SND_SOC_BIAS_PREPARE)
4544                         snd_soc_dapm_set_bias_level(dapm,
4545                                                     SND_SOC_BIAS_STANDBY);
4546         }
4547 
4548         mutex_unlock(&card->dapm_mutex);
4549 }
4550 
4551 /*
4552  * snd_soc_dapm_shutdown - callback for system shutdown
4553  */
4554 void snd_soc_dapm_shutdown(struct snd_soc_card *card)
4555 {
4556         struct snd_soc_dapm_context *dapm;
4557 
4558         list_for_each_entry(dapm, &card->dapm_list, list) {
4559                 if (dapm != &card->dapm) {
4560                         soc_dapm_shutdown_dapm(dapm);
4561                         if (dapm->bias_level == SND_SOC_BIAS_STANDBY)
4562                                 snd_soc_dapm_set_bias_level(dapm,
4563                                                             SND_SOC_BIAS_OFF);
4564                 }
4565         }
4566 
4567         soc_dapm_shutdown_dapm(&card->dapm);
4568         if (card->dapm.bias_level == SND_SOC_BIAS_STANDBY)
4569                 snd_soc_dapm_set_bias_level(&card->dapm,
4570                                             SND_SOC_BIAS_OFF);
4571 }
4572 
4573 /* Module information */
4574 MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
4575 MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
4576 MODULE_LICENSE("GPL");
4577 

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