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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/slab.h>
 39 #include <sound/core.h>
 40 #include <sound/pcm.h>
 41 #include <sound/pcm_params.h>
 42 #include <sound/soc.h>
 43 #include <sound/initval.h>
 44 
 45 #include <trace/events/asoc.h>
 46 
 47 #define DAPM_UPDATE_STAT(widget, val) widget->dapm->card->dapm_stats.val++;
 48 
 49 /* dapm power sequences - make this per codec in the future */
 50 static int dapm_up_seq[] = {
 51         [snd_soc_dapm_pre] = 0,
 52         [snd_soc_dapm_supply] = 1,
 53         [snd_soc_dapm_regulator_supply] = 1,
 54         [snd_soc_dapm_micbias] = 2,
 55         [snd_soc_dapm_dai] = 3,
 56         [snd_soc_dapm_aif_in] = 3,
 57         [snd_soc_dapm_aif_out] = 3,
 58         [snd_soc_dapm_mic] = 4,
 59         [snd_soc_dapm_mux] = 5,
 60         [snd_soc_dapm_virt_mux] = 5,
 61         [snd_soc_dapm_value_mux] = 5,
 62         [snd_soc_dapm_dac] = 6,
 63         [snd_soc_dapm_mixer] = 7,
 64         [snd_soc_dapm_mixer_named_ctl] = 7,
 65         [snd_soc_dapm_pga] = 8,
 66         [snd_soc_dapm_adc] = 9,
 67         [snd_soc_dapm_out_drv] = 10,
 68         [snd_soc_dapm_hp] = 10,
 69         [snd_soc_dapm_spk] = 10,
 70         [snd_soc_dapm_line] = 10,
 71         [snd_soc_dapm_post] = 11,
 72 };
 73 
 74 static int dapm_down_seq[] = {
 75         [snd_soc_dapm_pre] = 0,
 76         [snd_soc_dapm_adc] = 1,
 77         [snd_soc_dapm_hp] = 2,
 78         [snd_soc_dapm_spk] = 2,
 79         [snd_soc_dapm_line] = 2,
 80         [snd_soc_dapm_out_drv] = 2,
 81         [snd_soc_dapm_pga] = 4,
 82         [snd_soc_dapm_mixer_named_ctl] = 5,
 83         [snd_soc_dapm_mixer] = 5,
 84         [snd_soc_dapm_dac] = 6,
 85         [snd_soc_dapm_mic] = 7,
 86         [snd_soc_dapm_micbias] = 8,
 87         [snd_soc_dapm_mux] = 9,
 88         [snd_soc_dapm_virt_mux] = 9,
 89         [snd_soc_dapm_value_mux] = 9,
 90         [snd_soc_dapm_aif_in] = 10,
 91         [snd_soc_dapm_aif_out] = 10,
 92         [snd_soc_dapm_dai] = 10,
 93         [snd_soc_dapm_regulator_supply] = 11,
 94         [snd_soc_dapm_supply] = 11,
 95         [snd_soc_dapm_post] = 12,
 96 };
 97 
 98 static void pop_wait(u32 pop_time)
 99 {
100         if (pop_time)
101                 schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
102 }
103 
104 static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
105 {
106         va_list args;
107         char *buf;
108 
109         if (!pop_time)
110                 return;
111 
112         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
113         if (buf == NULL)
114                 return;
115 
116         va_start(args, fmt);
117         vsnprintf(buf, PAGE_SIZE, fmt, args);
118         dev_info(dev, "%s", buf);
119         va_end(args);
120 
121         kfree(buf);
122 }
123 
124 static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
125 {
126         return !list_empty(&w->dirty);
127 }
128 
129 void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
130 {
131         if (!dapm_dirty_widget(w)) {
132                 dev_vdbg(w->dapm->dev, "Marking %s dirty due to %s\n",
133                          w->name, reason);
134                 list_add_tail(&w->dirty, &w->dapm->card->dapm_dirty);
135         }
136 }
137 EXPORT_SYMBOL_GPL(dapm_mark_dirty);
138 
139 /* create a new dapm widget */
140 static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
141         const struct snd_soc_dapm_widget *_widget)
142 {
143         return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
144 }
145 
146 /* get snd_card from DAPM context */
147 static inline struct snd_card *dapm_get_snd_card(
148         struct snd_soc_dapm_context *dapm)
149 {
150         if (dapm->codec)
151                 return dapm->codec->card->snd_card;
152         else if (dapm->platform)
153                 return dapm->platform->card->snd_card;
154         else
155                 BUG();
156 
157         /* unreachable */
158         return NULL;
159 }
160 
161 /* get soc_card from DAPM context */
162 static inline struct snd_soc_card *dapm_get_soc_card(
163                 struct snd_soc_dapm_context *dapm)
164 {
165         if (dapm->codec)
166                 return dapm->codec->card;
167         else if (dapm->platform)
168                 return dapm->platform->card;
169         else
170                 BUG();
171 
172         /* unreachable */
173         return NULL;
174 }
175 
176 static void dapm_reset(struct snd_soc_card *card)
177 {
178         struct snd_soc_dapm_widget *w;
179 
180         memset(&card->dapm_stats, 0, sizeof(card->dapm_stats));
181 
182         list_for_each_entry(w, &card->widgets, list) {
183                 w->power_checked = false;
184                 w->inputs = -1;
185                 w->outputs = -1;
186         }
187 }
188 
189 static int soc_widget_read(struct snd_soc_dapm_widget *w, int reg)
190 {
191         if (w->codec)
192                 return snd_soc_read(w->codec, reg);
193         else if (w->platform)
194                 return snd_soc_platform_read(w->platform, reg);
195 
196         dev_err(w->dapm->dev, "no valid widget read method\n");
197         return -1;
198 }
199 
200 static int soc_widget_write(struct snd_soc_dapm_widget *w, int reg, int val)
201 {
202         if (w->codec)
203                 return snd_soc_write(w->codec, reg, val);
204         else if (w->platform)
205                 return snd_soc_platform_write(w->platform, reg, val);
206 
207         dev_err(w->dapm->dev, "no valid widget write method\n");
208         return -1;
209 }
210 
211 static int soc_widget_update_bits(struct snd_soc_dapm_widget *w,
212         unsigned short reg, unsigned int mask, unsigned int value)
213 {
214         bool change;
215         unsigned int old, new;
216         int ret;
217 
218         if (w->codec && w->codec->using_regmap) {
219                 ret = regmap_update_bits_check(w->codec->control_data,
220                                                reg, mask, value, &change);
221                 if (ret != 0)
222                         return ret;
223         } else {
224                 ret = soc_widget_read(w, reg);
225                 if (ret < 0)
226                         return ret;
227 
228                 old = ret;
229                 new = (old & ~mask) | (value & mask);
230                 change = old != new;
231                 if (change) {
232                         ret = soc_widget_write(w, reg, new);
233                         if (ret < 0)
234                                 return ret;
235                 }
236         }
237 
238         return change;
239 }
240 
241 /**
242  * snd_soc_dapm_set_bias_level - set the bias level for the system
243  * @dapm: DAPM context
244  * @level: level to configure
245  *
246  * Configure the bias (power) levels for the SoC audio device.
247  *
248  * Returns 0 for success else error.
249  */
250 static int snd_soc_dapm_set_bias_level(struct snd_soc_dapm_context *dapm,
251                                        enum snd_soc_bias_level level)
252 {
253         struct snd_soc_card *card = dapm->card;
254         int ret = 0;
255 
256         trace_snd_soc_bias_level_start(card, level);
257 
258         if (card && card->set_bias_level)
259                 ret = card->set_bias_level(card, dapm, level);
260         if (ret != 0)
261                 goto out;
262 
263         if (dapm->codec) {
264                 if (dapm->codec->driver->set_bias_level)
265                         ret = dapm->codec->driver->set_bias_level(dapm->codec,
266                                                                   level);
267                 else
268                         dapm->bias_level = level;
269         }
270         if (ret != 0)
271                 goto out;
272 
273         if (card && card->set_bias_level_post)
274                 ret = card->set_bias_level_post(card, dapm, level);
275 out:
276         trace_snd_soc_bias_level_done(card, level);
277 
278         return ret;
279 }
280 
281 /* set up initial codec paths */
282 static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
283         struct snd_soc_dapm_path *p, int i)
284 {
285         switch (w->id) {
286         case snd_soc_dapm_switch:
287         case snd_soc_dapm_mixer:
288         case snd_soc_dapm_mixer_named_ctl: {
289                 int val;
290                 struct soc_mixer_control *mc = (struct soc_mixer_control *)
291                         w->kcontrol_news[i].private_value;
292                 unsigned int reg = mc->reg;
293                 unsigned int shift = mc->shift;
294                 int max = mc->max;
295                 unsigned int mask = (1 << fls(max)) - 1;
296                 unsigned int invert = mc->invert;
297 
298                 val = soc_widget_read(w, reg);
299                 val = (val >> shift) & mask;
300 
301                 if ((invert && !val) || (!invert && val))
302                         p->connect = 1;
303                 else
304                         p->connect = 0;
305         }
306         break;
307         case snd_soc_dapm_mux: {
308                 struct soc_enum *e = (struct soc_enum *)
309                         w->kcontrol_news[i].private_value;
310                 int val, item, bitmask;
311 
312                 for (bitmask = 1; bitmask < e->max; bitmask <<= 1)
313                         ;
314                 val = soc_widget_read(w, e->reg);
315                 item = (val >> e->shift_l) & (bitmask - 1);
316 
317                 p->connect = 0;
318                 for (i = 0; i < e->max; i++) {
319                         if (!(strcmp(p->name, e->texts[i])) && item == i)
320                                 p->connect = 1;
321                 }
322         }
323         break;
324         case snd_soc_dapm_virt_mux: {
325                 struct soc_enum *e = (struct soc_enum *)
326                         w->kcontrol_news[i].private_value;
327 
328                 p->connect = 0;
329                 /* since a virtual mux has no backing registers to
330                  * decide which path to connect, it will try to match
331                  * with the first enumeration.  This is to ensure
332                  * that the default mux choice (the first) will be
333                  * correctly powered up during initialization.
334                  */
335                 if (!strcmp(p->name, e->texts[0]))
336                         p->connect = 1;
337         }
338         break;
339         case snd_soc_dapm_value_mux: {
340                 struct soc_enum *e = (struct soc_enum *)
341                         w->kcontrol_news[i].private_value;
342                 int val, item;
343 
344                 val = soc_widget_read(w, e->reg);
345                 val = (val >> e->shift_l) & e->mask;
346                 for (item = 0; item < e->max; item++) {
347                         if (val == e->values[item])
348                                 break;
349                 }
350 
351                 p->connect = 0;
352                 for (i = 0; i < e->max; i++) {
353                         if (!(strcmp(p->name, e->texts[i])) && item == i)
354                                 p->connect = 1;
355                 }
356         }
357         break;
358         /* does not affect routing - always connected */
359         case snd_soc_dapm_pga:
360         case snd_soc_dapm_out_drv:
361         case snd_soc_dapm_output:
362         case snd_soc_dapm_adc:
363         case snd_soc_dapm_input:
364         case snd_soc_dapm_siggen:
365         case snd_soc_dapm_dac:
366         case snd_soc_dapm_micbias:
367         case snd_soc_dapm_vmid:
368         case snd_soc_dapm_supply:
369         case snd_soc_dapm_regulator_supply:
370         case snd_soc_dapm_aif_in:
371         case snd_soc_dapm_aif_out:
372         case snd_soc_dapm_dai:
373         case snd_soc_dapm_hp:
374         case snd_soc_dapm_mic:
375         case snd_soc_dapm_spk:
376         case snd_soc_dapm_line:
377                 p->connect = 1;
378         break;
379         /* does affect routing - dynamically connected */
380         case snd_soc_dapm_pre:
381         case snd_soc_dapm_post:
382                 p->connect = 0;
383         break;
384         }
385 }
386 
387 /* connect mux widget to its interconnecting audio paths */
388 static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
389         struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
390         struct snd_soc_dapm_path *path, const char *control_name,
391         const struct snd_kcontrol_new *kcontrol)
392 {
393         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
394         int i;
395 
396         for (i = 0; i < e->max; i++) {
397                 if (!(strcmp(control_name, e->texts[i]))) {
398                         list_add(&path->list, &dapm->card->paths);
399                         list_add(&path->list_sink, &dest->sources);
400                         list_add(&path->list_source, &src->sinks);
401                         path->name = (char*)e->texts[i];
402                         dapm_set_path_status(dest, path, 0);
403                         return 0;
404                 }
405         }
406 
407         return -ENODEV;
408 }
409 
410 /* connect mixer widget to its interconnecting audio paths */
411 static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
412         struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
413         struct snd_soc_dapm_path *path, const char *control_name)
414 {
415         int i;
416 
417         /* search for mixer kcontrol */
418         for (i = 0; i < dest->num_kcontrols; i++) {
419                 if (!strcmp(control_name, dest->kcontrol_news[i].name)) {
420                         list_add(&path->list, &dapm->card->paths);
421                         list_add(&path->list_sink, &dest->sources);
422                         list_add(&path->list_source, &src->sinks);
423                         path->name = dest->kcontrol_news[i].name;
424                         dapm_set_path_status(dest, path, i);
425                         return 0;
426                 }
427         }
428         return -ENODEV;
429 }
430 
431 static int dapm_is_shared_kcontrol(struct snd_soc_dapm_context *dapm,
432         struct snd_soc_dapm_widget *kcontrolw,
433         const struct snd_kcontrol_new *kcontrol_new,
434         struct snd_kcontrol **kcontrol)
435 {
436         struct snd_soc_dapm_widget *w;
437         int i;
438 
439         *kcontrol = NULL;
440 
441         list_for_each_entry(w, &dapm->card->widgets, list) {
442                 if (w == kcontrolw || w->dapm != kcontrolw->dapm)
443                         continue;
444                 for (i = 0; i < w->num_kcontrols; i++) {
445                         if (&w->kcontrol_news[i] == kcontrol_new) {
446                                 if (w->kcontrols)
447                                         *kcontrol = w->kcontrols[i];
448                                 return 1;
449                         }
450                 }
451         }
452 
453         return 0;
454 }
455 
456 /* create new dapm mixer control */
457 static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
458 {
459         struct snd_soc_dapm_context *dapm = w->dapm;
460         int i, ret = 0;
461         size_t name_len, prefix_len;
462         struct snd_soc_dapm_path *path;
463         struct snd_card *card = dapm->card->snd_card;
464         const char *prefix;
465         struct snd_soc_dapm_widget_list *wlist;
466         size_t wlistsize;
467 
468         if (dapm->codec)
469                 prefix = dapm->codec->name_prefix;
470         else
471                 prefix = NULL;
472 
473         if (prefix)
474                 prefix_len = strlen(prefix) + 1;
475         else
476                 prefix_len = 0;
477 
478         /* add kcontrol */
479         for (i = 0; i < w->num_kcontrols; i++) {
480 
481                 /* match name */
482                 list_for_each_entry(path, &w->sources, list_sink) {
483 
484                         /* mixer/mux paths name must match control name */
485                         if (path->name != (char *)w->kcontrol_news[i].name)
486                                 continue;
487 
488                         if (w->kcontrols[i]) {
489                                 path->kcontrol = w->kcontrols[i];
490                                 continue;
491                         }
492 
493                         wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
494                                     sizeof(struct snd_soc_dapm_widget *),
495                         wlist = kzalloc(wlistsize, GFP_KERNEL);
496                         if (wlist == NULL) {
497                                 dev_err(dapm->dev,
498                                         "asoc: can't allocate widget list for %s\n",
499                                         w->name);
500                                 return -ENOMEM;
501                         }
502                         wlist->num_widgets = 1;
503                         wlist->widgets[0] = w;
504 
505                         /* add dapm control with long name.
506                          * for dapm_mixer this is the concatenation of the
507                          * mixer and kcontrol name.
508                          * for dapm_mixer_named_ctl this is simply the
509                          * kcontrol name.
510                          */
511                         name_len = strlen(w->kcontrol_news[i].name) + 1;
512                         if (w->id != snd_soc_dapm_mixer_named_ctl)
513                                 name_len += 1 + strlen(w->name);
514 
515                         path->long_name = kmalloc(name_len, GFP_KERNEL);
516 
517                         if (path->long_name == NULL) {
518                                 kfree(wlist);
519                                 return -ENOMEM;
520                         }
521 
522                         switch (w->id) {
523                         default:
524                                 /* The control will get a prefix from
525                                  * the control creation process but
526                                  * we're also using the same prefix
527                                  * for widgets so cut the prefix off
528                                  * the front of the widget name.
529                                  */
530                                 snprintf((char *)path->long_name, name_len,
531                                          "%s %s", w->name + prefix_len,
532                                          w->kcontrol_news[i].name);
533                                 break;
534                         case snd_soc_dapm_mixer_named_ctl:
535                                 snprintf((char *)path->long_name, name_len,
536                                          "%s", w->kcontrol_news[i].name);
537                                 break;
538                         }
539 
540                         ((char *)path->long_name)[name_len - 1] = '\0';
541 
542                         path->kcontrol = snd_soc_cnew(&w->kcontrol_news[i],
543                                                       wlist, path->long_name,
544                                                       prefix);
545                         ret = snd_ctl_add(card, path->kcontrol);
546                         if (ret < 0) {
547                                 dev_err(dapm->dev,
548                                         "asoc: failed to add dapm kcontrol %s: %d\n",
549                                         path->long_name, ret);
550                                 kfree(wlist);
551                                 kfree(path->long_name);
552                                 path->long_name = NULL;
553                                 return ret;
554                         }
555                         w->kcontrols[i] = path->kcontrol;
556                 }
557         }
558         return ret;
559 }
560 
561 /* create new dapm mux control */
562 static int dapm_new_mux(struct snd_soc_dapm_widget *w)
563 {
564         struct snd_soc_dapm_context *dapm = w->dapm;
565         struct snd_soc_dapm_path *path = NULL;
566         struct snd_kcontrol *kcontrol;
567         struct snd_card *card = dapm->card->snd_card;
568         const char *prefix;
569         size_t prefix_len;
570         int ret;
571         struct snd_soc_dapm_widget_list *wlist;
572         int shared, wlistentries;
573         size_t wlistsize;
574         const char *name;
575 
576         if (w->num_kcontrols != 1) {
577                 dev_err(dapm->dev,
578                         "asoc: mux %s has incorrect number of controls\n",
579                         w->name);
580                 return -EINVAL;
581         }
582 
583         shared = dapm_is_shared_kcontrol(dapm, w, &w->kcontrol_news[0],
584                                          &kcontrol);
585         if (kcontrol) {
586                 wlist = kcontrol->private_data;
587                 wlistentries = wlist->num_widgets + 1;
588         } else {
589                 wlist = NULL;
590                 wlistentries = 1;
591         }
592         wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
593                 wlistentries * sizeof(struct snd_soc_dapm_widget *),
594         wlist = krealloc(wlist, wlistsize, GFP_KERNEL);
595         if (wlist == NULL) {
596                 dev_err(dapm->dev,
597                         "asoc: can't allocate widget list for %s\n", w->name);
598                 return -ENOMEM;
599         }
600         wlist->num_widgets = wlistentries;
601         wlist->widgets[wlistentries - 1] = w;
602 
603         if (!kcontrol) {
604                 if (dapm->codec)
605                         prefix = dapm->codec->name_prefix;
606                 else
607                         prefix = NULL;
608 
609                 if (shared) {
610                         name = w->kcontrol_news[0].name;
611                         prefix_len = 0;
612                 } else {
613                         name = w->name;
614                         if (prefix)
615                                 prefix_len = strlen(prefix) + 1;
616                         else
617                                 prefix_len = 0;
618                 }
619 
620                 /*
621                  * The control will get a prefix from the control creation
622                  * process but we're also using the same prefix for widgets so
623                  * cut the prefix off the front of the widget name.
624                  */
625                 kcontrol = snd_soc_cnew(&w->kcontrol_news[0], wlist,
626                                         name + prefix_len, prefix);
627                 ret = snd_ctl_add(card, kcontrol);
628                 if (ret < 0) {
629                         dev_err(dapm->dev, "failed to add kcontrol %s: %d\n",
630                                 w->name, ret);
631                         kfree(wlist);
632                         return ret;
633                 }
634         }
635 
636         kcontrol->private_data = wlist;
637 
638         w->kcontrols[0] = kcontrol;
639 
640         list_for_each_entry(path, &w->sources, list_sink)
641                 path->kcontrol = kcontrol;
642 
643         return 0;
644 }
645 
646 /* create new dapm volume control */
647 static int dapm_new_pga(struct snd_soc_dapm_widget *w)
648 {
649         if (w->num_kcontrols)
650                 dev_err(w->dapm->dev,
651                         "asoc: PGA controls not supported: '%s'\n", w->name);
652 
653         return 0;
654 }
655 
656 /* reset 'walked' bit for each dapm path */
657 static inline void dapm_clear_walk(struct snd_soc_dapm_context *dapm)
658 {
659         struct snd_soc_dapm_path *p;
660 
661         list_for_each_entry(p, &dapm->card->paths, list)
662                 p->walked = 0;
663 }
664 
665 /* We implement power down on suspend by checking the power state of
666  * the ALSA card - when we are suspending the ALSA state for the card
667  * is set to D3.
668  */
669 static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
670 {
671         int level = snd_power_get_state(widget->dapm->card->snd_card);
672 
673         switch (level) {
674         case SNDRV_CTL_POWER_D3hot:
675         case SNDRV_CTL_POWER_D3cold:
676                 if (widget->ignore_suspend)
677                         dev_dbg(widget->dapm->dev, "%s ignoring suspend\n",
678                                 widget->name);
679                 return widget->ignore_suspend;
680         default:
681                 return 1;
682         }
683 }
684 
685 /*
686  * Recursively check for a completed path to an active or physically connected
687  * output widget. Returns number of complete paths.
688  */
689 static int is_connected_output_ep(struct snd_soc_dapm_widget *widget)
690 {
691         struct snd_soc_dapm_path *path;
692         int con = 0;
693 
694         if (widget->outputs >= 0)
695                 return widget->outputs;
696 
697         DAPM_UPDATE_STAT(widget, path_checks);
698 
699         switch (widget->id) {
700         case snd_soc_dapm_supply:
701         case snd_soc_dapm_regulator_supply:
702                 return 0;
703         default:
704                 break;
705         }
706 
707         switch (widget->id) {
708         case snd_soc_dapm_adc:
709         case snd_soc_dapm_aif_out:
710         case snd_soc_dapm_dai:
711                 if (widget->active) {
712                         widget->outputs = snd_soc_dapm_suspend_check(widget);
713                         return widget->outputs;
714                 }
715         default:
716                 break;
717         }
718 
719         if (widget->connected) {
720                 /* connected pin ? */
721                 if (widget->id == snd_soc_dapm_output && !widget->ext) {
722                         widget->outputs = snd_soc_dapm_suspend_check(widget);
723                         return widget->outputs;
724                 }
725 
726                 /* connected jack or spk ? */
727                 if (widget->id == snd_soc_dapm_hp ||
728                     widget->id == snd_soc_dapm_spk ||
729                     (widget->id == snd_soc_dapm_line &&
730                      !list_empty(&widget->sources))) {
731                         widget->outputs = snd_soc_dapm_suspend_check(widget);
732                         return widget->outputs;
733                 }
734         }
735 
736         list_for_each_entry(path, &widget->sinks, list_source) {
737                 DAPM_UPDATE_STAT(widget, neighbour_checks);
738 
739                 if (path->weak)
740                         continue;
741 
742                 if (path->walked)
743                         continue;
744 
745                 if (path->sink && path->connect) {
746                         path->walked = 1;
747                         con += is_connected_output_ep(path->sink);
748                 }
749         }
750 
751         widget->outputs = con;
752 
753         return con;
754 }
755 
756 /*
757  * Recursively check for a completed path to an active or physically connected
758  * input widget. Returns number of complete paths.
759  */
760 static int is_connected_input_ep(struct snd_soc_dapm_widget *widget)
761 {
762         struct snd_soc_dapm_path *path;
763         int con = 0;
764 
765         if (widget->inputs >= 0)
766                 return widget->inputs;
767 
768         DAPM_UPDATE_STAT(widget, path_checks);
769 
770         switch (widget->id) {
771         case snd_soc_dapm_supply:
772         case snd_soc_dapm_regulator_supply:
773                 return 0;
774         default:
775                 break;
776         }
777 
778         /* active stream ? */
779         switch (widget->id) {
780         case snd_soc_dapm_dac:
781         case snd_soc_dapm_aif_in:
782         case snd_soc_dapm_dai:
783                 if (widget->active) {
784                         widget->inputs = snd_soc_dapm_suspend_check(widget);
785                         return widget->inputs;
786                 }
787         default:
788                 break;
789         }
790 
791         if (widget->connected) {
792                 /* connected pin ? */
793                 if (widget->id == snd_soc_dapm_input && !widget->ext) {
794                         widget->inputs = snd_soc_dapm_suspend_check(widget);
795                         return widget->inputs;
796                 }
797 
798                 /* connected VMID/Bias for lower pops */
799                 if (widget->id == snd_soc_dapm_vmid) {
800                         widget->inputs = snd_soc_dapm_suspend_check(widget);
801                         return widget->inputs;
802                 }
803 
804                 /* connected jack ? */
805                 if (widget->id == snd_soc_dapm_mic ||
806                     (widget->id == snd_soc_dapm_line &&
807                      !list_empty(&widget->sinks))) {
808                         widget->inputs = snd_soc_dapm_suspend_check(widget);
809                         return widget->inputs;
810                 }
811 
812                 /* signal generator */
813                 if (widget->id == snd_soc_dapm_siggen) {
814                         widget->inputs = snd_soc_dapm_suspend_check(widget);
815                         return widget->inputs;
816                 }
817         }
818 
819         list_for_each_entry(path, &widget->sources, list_sink) {
820                 DAPM_UPDATE_STAT(widget, neighbour_checks);
821 
822                 if (path->weak)
823                         continue;
824 
825                 if (path->walked)
826                         continue;
827 
828                 if (path->source && path->connect) {
829                         path->walked = 1;
830                         con += is_connected_input_ep(path->source);
831                 }
832         }
833 
834         widget->inputs = con;
835 
836         return con;
837 }
838 
839 /*
840  * Handler for generic register modifier widget.
841  */
842 int dapm_reg_event(struct snd_soc_dapm_widget *w,
843                    struct snd_kcontrol *kcontrol, int event)
844 {
845         unsigned int val;
846 
847         if (SND_SOC_DAPM_EVENT_ON(event))
848                 val = w->on_val;
849         else
850                 val = w->off_val;
851 
852         soc_widget_update_bits(w, -(w->reg + 1),
853                             w->mask << w->shift, val << w->shift);
854 
855         return 0;
856 }
857 EXPORT_SYMBOL_GPL(dapm_reg_event);
858 
859 /*
860  * Handler for regulator supply widget.
861  */
862 int dapm_regulator_event(struct snd_soc_dapm_widget *w,
863                    struct snd_kcontrol *kcontrol, int event)
864 {
865         if (SND_SOC_DAPM_EVENT_ON(event))
866                 return regulator_enable(w->priv);
867         else
868                 return regulator_disable_deferred(w->priv, w->shift);
869 }
870 EXPORT_SYMBOL_GPL(dapm_regulator_event);
871 
872 static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
873 {
874         if (w->power_checked)
875                 return w->new_power;
876 
877         if (w->force)
878                 w->new_power = 1;
879         else
880                 w->new_power = w->power_check(w);
881 
882         w->power_checked = true;
883 
884         return w->new_power;
885 }
886 
887 /* Generic check to see if a widget should be powered.
888  */
889 static int dapm_generic_check_power(struct snd_soc_dapm_widget *w)
890 {
891         int in, out;
892 
893         DAPM_UPDATE_STAT(w, power_checks);
894 
895         in = is_connected_input_ep(w);
896         dapm_clear_walk(w->dapm);
897         out = is_connected_output_ep(w);
898         dapm_clear_walk(w->dapm);
899         return out != 0 && in != 0;
900 }
901 
902 static int dapm_dai_check_power(struct snd_soc_dapm_widget *w)
903 {
904         DAPM_UPDATE_STAT(w, power_checks);
905 
906         return w->active;
907 }
908 
909 /* Check to see if an ADC has power */
910 static int dapm_adc_check_power(struct snd_soc_dapm_widget *w)
911 {
912         int in;
913 
914         DAPM_UPDATE_STAT(w, power_checks);
915 
916         if (w->active) {
917                 in = is_connected_input_ep(w);
918                 dapm_clear_walk(w->dapm);
919                 return in != 0;
920         } else {
921                 return dapm_generic_check_power(w);
922         }
923 }
924 
925 /* Check to see if a DAC has power */
926 static int dapm_dac_check_power(struct snd_soc_dapm_widget *w)
927 {
928         int out;
929 
930         DAPM_UPDATE_STAT(w, power_checks);
931 
932         if (w->active) {
933                 out = is_connected_output_ep(w);
934                 dapm_clear_walk(w->dapm);
935                 return out != 0;
936         } else {
937                 return dapm_generic_check_power(w);
938         }
939 }
940 
941 /* Check to see if a power supply is needed */
942 static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
943 {
944         struct snd_soc_dapm_path *path;
945 
946         DAPM_UPDATE_STAT(w, power_checks);
947 
948         /* Check if one of our outputs is connected */
949         list_for_each_entry(path, &w->sinks, list_source) {
950                 DAPM_UPDATE_STAT(w, neighbour_checks);
951 
952                 if (path->weak)
953                         continue;
954 
955                 if (path->connected &&
956                     !path->connected(path->source, path->sink))
957                         continue;
958 
959                 if (!path->sink)
960                         continue;
961 
962                 if (dapm_widget_power_check(path->sink))
963                         return 1;
964         }
965 
966         dapm_clear_walk(w->dapm);
967 
968         return 0;
969 }
970 
971 static int dapm_always_on_check_power(struct snd_soc_dapm_widget *w)
972 {
973         return 1;
974 }
975 
976 static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
977                             struct snd_soc_dapm_widget *b,
978                             bool power_up)
979 {
980         int *sort;
981 
982         if (power_up)
983                 sort = dapm_up_seq;
984         else
985                 sort = dapm_down_seq;
986 
987         if (sort[a->id] != sort[b->id])
988                 return sort[a->id] - sort[b->id];
989         if (a->subseq != b->subseq) {
990                 if (power_up)
991                         return a->subseq - b->subseq;
992                 else
993                         return b->subseq - a->subseq;
994         }
995         if (a->reg != b->reg)
996                 return a->reg - b->reg;
997         if (a->dapm != b->dapm)
998                 return (unsigned long)a->dapm - (unsigned long)b->dapm;
999 
1000         return 0;
1001 }
1002 
1003 /* Insert a widget in order into a DAPM power sequence. */
1004 static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget,
1005                             struct list_head *list,
1006                             bool power_up)
1007 {
1008         struct snd_soc_dapm_widget *w;
1009 
1010         list_for_each_entry(w, list, power_list)
1011                 if (dapm_seq_compare(new_widget, w, power_up) < 0) {
1012                         list_add_tail(&new_widget->power_list, &w->power_list);
1013                         return;
1014                 }
1015 
1016         list_add_tail(&new_widget->power_list, list);
1017 }
1018 
1019 static void dapm_seq_check_event(struct snd_soc_dapm_context *dapm,
1020                                  struct snd_soc_dapm_widget *w, int event)
1021 {
1022         struct snd_soc_card *card = dapm->card;
1023         const char *ev_name;
1024         int power, ret;
1025 
1026         switch (event) {
1027         case SND_SOC_DAPM_PRE_PMU:
1028                 ev_name = "PRE_PMU";
1029                 power = 1;
1030                 break;
1031         case SND_SOC_DAPM_POST_PMU:
1032                 ev_name = "POST_PMU";
1033                 power = 1;
1034                 break;
1035         case SND_SOC_DAPM_PRE_PMD:
1036                 ev_name = "PRE_PMD";
1037                 power = 0;
1038                 break;
1039         case SND_SOC_DAPM_POST_PMD:
1040                 ev_name = "POST_PMD";
1041                 power = 0;
1042                 break;
1043         default:
1044                 BUG();
1045                 return;
1046         }
1047 
1048         if (w->power != power)
1049                 return;
1050 
1051         if (w->event && (w->event_flags & event)) {
1052                 pop_dbg(dapm->dev, card->pop_time, "pop test : %s %s\n",
1053                         w->name, ev_name);
1054                 trace_snd_soc_dapm_widget_event_start(w, event);
1055                 ret = w->event(w, NULL, event);
1056                 trace_snd_soc_dapm_widget_event_done(w, event);
1057                 if (ret < 0)
1058                         pr_err("%s: %s event failed: %d\n",
1059                                ev_name, w->name, ret);
1060         }
1061 }
1062 
1063 /* Apply the coalesced changes from a DAPM sequence */
1064 static void dapm_seq_run_coalesced(struct snd_soc_dapm_context *dapm,
1065                                    struct list_head *pending)
1066 {
1067         struct snd_soc_card *card = dapm->card;
1068         struct snd_soc_dapm_widget *w;
1069         int reg, power;
1070         unsigned int value = 0;
1071         unsigned int mask = 0;
1072         unsigned int cur_mask;
1073 
1074         reg = list_first_entry(pending, struct snd_soc_dapm_widget,
1075                                power_list)->reg;
1076 
1077         list_for_each_entry(w, pending, power_list) {
1078                 cur_mask = 1 << w->shift;
1079                 BUG_ON(reg != w->reg);
1080 
1081                 if (w->invert)
1082                         power = !w->power;
1083                 else
1084                         power = w->power;
1085 
1086                 mask |= cur_mask;
1087                 if (power)
1088                         value |= cur_mask;
1089 
1090                 pop_dbg(dapm->dev, card->pop_time,
1091                         "pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n",
1092                         w->name, reg, value, mask);
1093 
1094                 /* Check for events */
1095                 dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMU);
1096                 dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMD);
1097         }
1098 
1099         if (reg >= 0) {
1100                 /* Any widget will do, they should all be updating the
1101                  * same register.
1102                  */
1103                 w = list_first_entry(pending, struct snd_soc_dapm_widget,
1104                                      power_list);
1105 
1106                 pop_dbg(dapm->dev, card->pop_time,
1107                         "pop test : Applying 0x%x/0x%x to %x in %dms\n",
1108                         value, mask, reg, card->pop_time);
1109                 pop_wait(card->pop_time);
1110                 soc_widget_update_bits(w, reg, mask, value);
1111         }
1112 
1113         list_for_each_entry(w, pending, power_list) {
1114                 dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMU);
1115                 dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMD);
1116         }
1117 }
1118 
1119 /* Apply a DAPM power sequence.
1120  *
1121  * We walk over a pre-sorted list of widgets to apply power to.  In
1122  * order to minimise the number of writes to the device required
1123  * multiple widgets will be updated in a single write where possible.
1124  * Currently anything that requires more than a single write is not
1125  * handled.
1126  */
1127 static void dapm_seq_run(struct snd_soc_dapm_context *dapm,
1128                          struct list_head *list, int event, bool power_up)
1129 {
1130         struct snd_soc_dapm_widget *w, *n;
1131         LIST_HEAD(pending);
1132         int cur_sort = -1;
1133         int cur_subseq = -1;
1134         int cur_reg = SND_SOC_NOPM;
1135         struct snd_soc_dapm_context *cur_dapm = NULL;
1136         int ret, i;
1137         int *sort;
1138 
1139         if (power_up)
1140                 sort = dapm_up_seq;
1141         else
1142                 sort = dapm_down_seq;
1143 
1144         list_for_each_entry_safe(w, n, list, power_list) {
1145                 ret = 0;
1146 
1147                 /* Do we need to apply any queued changes? */
1148                 if (sort[w->id] != cur_sort || w->reg != cur_reg ||
1149                     w->dapm != cur_dapm || w->subseq != cur_subseq) {
1150                         if (!list_empty(&pending))
1151                                 dapm_seq_run_coalesced(cur_dapm, &pending);
1152 
1153                         if (cur_dapm && cur_dapm->seq_notifier) {
1154                                 for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1155                                         if (sort[i] == cur_sort)
1156                                                 cur_dapm->seq_notifier(cur_dapm,
1157                                                                        i,
1158                                                                        cur_subseq);
1159                         }
1160 
1161                         INIT_LIST_HEAD(&pending);
1162                         cur_sort = -1;
1163                         cur_subseq = INT_MIN;
1164                         cur_reg = SND_SOC_NOPM;
1165                         cur_dapm = NULL;
1166                 }
1167 
1168                 switch (w->id) {
1169                 case snd_soc_dapm_pre:
1170                         if (!w->event)
1171                                 list_for_each_entry_safe_continue(w, n, list,
1172                                                                   power_list);
1173 
1174                         if (event == SND_SOC_DAPM_STREAM_START)
1175                                 ret = w->event(w,
1176                                                NULL, SND_SOC_DAPM_PRE_PMU);
1177                         else if (event == SND_SOC_DAPM_STREAM_STOP)
1178                                 ret = w->event(w,
1179                                                NULL, SND_SOC_DAPM_PRE_PMD);
1180                         break;
1181 
1182                 case snd_soc_dapm_post:
1183                         if (!w->event)
1184                                 list_for_each_entry_safe_continue(w, n, list,
1185                                                                   power_list);
1186 
1187                         if (event == SND_SOC_DAPM_STREAM_START)
1188                                 ret = w->event(w,
1189                                                NULL, SND_SOC_DAPM_POST_PMU);
1190                         else if (event == SND_SOC_DAPM_STREAM_STOP)
1191                                 ret = w->event(w,
1192                                                NULL, SND_SOC_DAPM_POST_PMD);
1193                         break;
1194 
1195                 default:
1196                         /* Queue it up for application */
1197                         cur_sort = sort[w->id];
1198                         cur_subseq = w->subseq;
1199                         cur_reg = w->reg;
1200                         cur_dapm = w->dapm;
1201                         list_move(&w->power_list, &pending);
1202                         break;
1203                 }
1204 
1205                 if (ret < 0)
1206                         dev_err(w->dapm->dev,
1207                                 "Failed to apply widget power: %d\n", ret);
1208         }
1209 
1210         if (!list_empty(&pending))
1211                 dapm_seq_run_coalesced(cur_dapm, &pending);
1212 
1213         if (cur_dapm && cur_dapm->seq_notifier) {
1214                 for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1215                         if (sort[i] == cur_sort)
1216                                 cur_dapm->seq_notifier(cur_dapm,
1217                                                        i, cur_subseq);
1218         }
1219 }
1220 
1221 static void dapm_widget_update(struct snd_soc_dapm_context *dapm)
1222 {
1223         struct snd_soc_dapm_update *update = dapm->update;
1224         struct snd_soc_dapm_widget *w;
1225         int ret;
1226 
1227         if (!update)
1228                 return;
1229 
1230         w = update->widget;
1231 
1232         if (w->event &&
1233             (w->event_flags & SND_SOC_DAPM_PRE_REG)) {
1234                 ret = w->event(w, update->kcontrol, SND_SOC_DAPM_PRE_REG);
1235                 if (ret != 0)
1236                         pr_err("%s DAPM pre-event failed: %d\n",
1237                                w->name, ret);
1238         }
1239 
1240         ret = snd_soc_update_bits(w->codec, update->reg, update->mask,
1241                                   update->val);
1242         if (ret < 0)
1243                 pr_err("%s DAPM update failed: %d\n", w->name, ret);
1244 
1245         if (w->event &&
1246             (w->event_flags & SND_SOC_DAPM_POST_REG)) {
1247                 ret = w->event(w, update->kcontrol, SND_SOC_DAPM_POST_REG);
1248                 if (ret != 0)
1249                         pr_err("%s DAPM post-event failed: %d\n",
1250                                w->name, ret);
1251         }
1252 }
1253 
1254 /* Async callback run prior to DAPM sequences - brings to _PREPARE if
1255  * they're changing state.
1256  */
1257 static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
1258 {
1259         struct snd_soc_dapm_context *d = data;
1260         int ret;
1261 
1262         /* If we're off and we're not supposed to be go into STANDBY */
1263         if (d->bias_level == SND_SOC_BIAS_OFF &&
1264             d->target_bias_level != SND_SOC_BIAS_OFF) {
1265                 if (d->dev)
1266                         pm_runtime_get_sync(d->dev);
1267 
1268                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1269                 if (ret != 0)
1270                         dev_err(d->dev,
1271                                 "Failed to turn on bias: %d\n", ret);
1272         }
1273 
1274         /* Prepare for a STADDBY->ON or ON->STANDBY transition */
1275         if (d->bias_level != d->target_bias_level) {
1276                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE);
1277                 if (ret != 0)
1278                         dev_err(d->dev,
1279                                 "Failed to prepare bias: %d\n", ret);
1280         }
1281 }
1282 
1283 /* Async callback run prior to DAPM sequences - brings to their final
1284  * state.
1285  */
1286 static void dapm_post_sequence_async(void *data, async_cookie_t cookie)
1287 {
1288         struct snd_soc_dapm_context *d = data;
1289         int ret;
1290 
1291         /* If we just powered the last thing off drop to standby bias */
1292         if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1293             (d->target_bias_level == SND_SOC_BIAS_STANDBY ||
1294              d->target_bias_level == SND_SOC_BIAS_OFF)) {
1295                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1296                 if (ret != 0)
1297                         dev_err(d->dev, "Failed to apply standby bias: %d\n",
1298                                 ret);
1299         }
1300 
1301         /* If we're in standby and can support bias off then do that */
1302         if (d->bias_level == SND_SOC_BIAS_STANDBY &&
1303             d->target_bias_level == SND_SOC_BIAS_OFF) {
1304                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_OFF);
1305                 if (ret != 0)
1306                         dev_err(d->dev, "Failed to turn off bias: %d\n", ret);
1307 
1308                 if (d->dev)
1309                         pm_runtime_put(d->dev);
1310         }
1311 
1312         /* If we just powered up then move to active bias */
1313         if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1314             d->target_bias_level == SND_SOC_BIAS_ON) {
1315                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_ON);
1316                 if (ret != 0)
1317                         dev_err(d->dev, "Failed to apply active bias: %d\n",
1318                                 ret);
1319         }
1320 }
1321 
1322 static void dapm_widget_set_peer_power(struct snd_soc_dapm_widget *peer,
1323                                        bool power, bool connect)
1324 {
1325         /* If a connection is being made or broken then that update
1326          * will have marked the peer dirty, otherwise the widgets are
1327          * not connected and this update has no impact. */
1328         if (!connect)
1329                 return;
1330 
1331         /* If the peer is already in the state we're moving to then we
1332          * won't have an impact on it. */
1333         if (power != peer->power)
1334                 dapm_mark_dirty(peer, "peer state change");
1335 }
1336 
1337 static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
1338                                   struct list_head *up_list,
1339                                   struct list_head *down_list)
1340 {
1341         struct snd_soc_dapm_path *path;
1342 
1343         if (w->power == power)
1344                 return;
1345 
1346         trace_snd_soc_dapm_widget_power(w, power);
1347 
1348         /* If we changed our power state perhaps our neigbours changed
1349          * also.
1350          */
1351         list_for_each_entry(path, &w->sources, list_sink) {
1352                 if (path->source) {
1353                         dapm_widget_set_peer_power(path->source, power,
1354                                                    path->connect);
1355                 }
1356         }
1357         switch (w->id) {
1358         case snd_soc_dapm_supply:
1359         case snd_soc_dapm_regulator_supply:
1360                 /* Supplies can't affect their outputs, only their inputs */
1361                 break;
1362         default:
1363                 list_for_each_entry(path, &w->sinks, list_source) {
1364                         if (path->sink) {
1365                                 dapm_widget_set_peer_power(path->sink, power,
1366                                                            path->connect);
1367                         }
1368                 }
1369                 break;
1370         }
1371 
1372         if (power)
1373                 dapm_seq_insert(w, up_list, true);
1374         else
1375                 dapm_seq_insert(w, down_list, false);
1376 
1377         w->power = power;
1378 }
1379 
1380 static void dapm_power_one_widget(struct snd_soc_dapm_widget *w,
1381                                   struct list_head *up_list,
1382                                   struct list_head *down_list)
1383 {
1384         int power;
1385 
1386         switch (w->id) {
1387         case snd_soc_dapm_pre:
1388                 dapm_seq_insert(w, down_list, false);
1389                 break;
1390         case snd_soc_dapm_post:
1391                 dapm_seq_insert(w, up_list, true);
1392                 break;
1393 
1394         default:
1395                 power = dapm_widget_power_check(w);
1396 
1397                 dapm_widget_set_power(w, power, up_list, down_list);
1398                 break;
1399         }
1400 }
1401 
1402 /*
1403  * Scan each dapm widget for complete audio path.
1404  * A complete path is a route that has valid endpoints i.e.:-
1405  *
1406  *  o DAC to output pin.
1407  *  o Input Pin to ADC.
1408  *  o Input pin to Output pin (bypass, sidetone)
1409  *  o DAC to ADC (loopback).
1410  */
1411 static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
1412 {
1413         struct snd_soc_card *card = dapm->card;
1414         struct snd_soc_dapm_widget *w;
1415         struct snd_soc_dapm_context *d;
1416         LIST_HEAD(up_list);
1417         LIST_HEAD(down_list);
1418         LIST_HEAD(async_domain);
1419         enum snd_soc_bias_level bias;
1420 
1421         trace_snd_soc_dapm_start(card);
1422 
1423         list_for_each_entry(d, &card->dapm_list, list) {
1424                 if (d->n_widgets || d->codec == NULL) {
1425                         if (d->idle_bias_off)
1426                                 d->target_bias_level = SND_SOC_BIAS_OFF;
1427                         else
1428                                 d->target_bias_level = SND_SOC_BIAS_STANDBY;
1429                 }
1430         }
1431 
1432         dapm_reset(card);
1433 
1434         /* Check which widgets we need to power and store them in
1435          * lists indicating if they should be powered up or down.  We
1436          * only check widgets that have been flagged as dirty but note
1437          * that new widgets may be added to the dirty list while we
1438          * iterate.
1439          */
1440         list_for_each_entry(w, &card->dapm_dirty, dirty) {
1441                 dapm_power_one_widget(w, &up_list, &down_list);
1442         }
1443 
1444         list_for_each_entry(w, &card->widgets, list) {
1445                 switch (w->id) {
1446                 case snd_soc_dapm_pre:
1447                 case snd_soc_dapm_post:
1448                         /* These widgets always need to be powered */
1449                         break;
1450                 default:
1451                         list_del_init(&w->dirty);
1452                         break;
1453                 }
1454 
1455                 if (w->power) {
1456                         d = w->dapm;
1457 
1458                         /* Supplies and micbiases only bring the
1459                          * context up to STANDBY as unless something
1460                          * else is active and passing audio they
1461                          * generally don't require full power.  Signal
1462                          * generators are virtual pins and have no
1463                          * power impact themselves.
1464                          */
1465                         switch (w->id) {
1466                         case snd_soc_dapm_siggen:
1467                                 break;
1468                         case snd_soc_dapm_supply:
1469                         case snd_soc_dapm_regulator_supply:
1470                         case snd_soc_dapm_micbias:
1471                                 if (d->target_bias_level < SND_SOC_BIAS_STANDBY)
1472                                         d->target_bias_level = SND_SOC_BIAS_STANDBY;
1473                                 break;
1474                         default:
1475                                 d->target_bias_level = SND_SOC_BIAS_ON;
1476                                 break;
1477                         }
1478                 }
1479 
1480         }
1481 
1482         /* If there are no DAPM widgets then try to figure out power from the
1483          * event type.
1484          */
1485         if (!dapm->n_widgets) {
1486                 switch (event) {
1487                 case SND_SOC_DAPM_STREAM_START:
1488                 case SND_SOC_DAPM_STREAM_RESUME:
1489                         dapm->target_bias_level = SND_SOC_BIAS_ON;
1490                         break;
1491                 case SND_SOC_DAPM_STREAM_STOP:
1492                         if (dapm->codec && dapm->codec->active)
1493                                 dapm->target_bias_level = SND_SOC_BIAS_ON;
1494                         else
1495                                 dapm->target_bias_level = SND_SOC_BIAS_STANDBY;
1496                         break;
1497                 case SND_SOC_DAPM_STREAM_SUSPEND:
1498                         dapm->target_bias_level = SND_SOC_BIAS_STANDBY;
1499                         break;
1500                 case SND_SOC_DAPM_STREAM_NOP:
1501                         dapm->target_bias_level = dapm->bias_level;
1502                         break;
1503                 default:
1504                         break;
1505                 }
1506         }
1507 
1508         /* Force all contexts in the card to the same bias state if
1509          * they're not ground referenced.
1510          */
1511         bias = SND_SOC_BIAS_OFF;
1512         list_for_each_entry(d, &card->dapm_list, list)
1513                 if (d->target_bias_level > bias)
1514                         bias = d->target_bias_level;
1515         list_for_each_entry(d, &card->dapm_list, list)
1516                 if (!d->idle_bias_off)
1517                         d->target_bias_level = bias;
1518 
1519         trace_snd_soc_dapm_walk_done(card);
1520 
1521         /* Run all the bias changes in parallel */
1522         list_for_each_entry(d, &dapm->card->dapm_list, list)
1523                 async_schedule_domain(dapm_pre_sequence_async, d,
1524                                         &async_domain);
1525         async_synchronize_full_domain(&async_domain);
1526 
1527         /* Power down widgets first; try to avoid amplifying pops. */
1528         dapm_seq_run(dapm, &down_list, event, false);
1529 
1530         dapm_widget_update(dapm);
1531 
1532         /* Now power up. */
1533         dapm_seq_run(dapm, &up_list, event, true);
1534 
1535         /* Run all the bias changes in parallel */
1536         list_for_each_entry(d, &dapm->card->dapm_list, list)
1537                 async_schedule_domain(dapm_post_sequence_async, d,
1538                                         &async_domain);
1539         async_synchronize_full_domain(&async_domain);
1540 
1541         /* do we need to notify any clients that DAPM event is complete */
1542         list_for_each_entry(d, &card->dapm_list, list) {
1543                 if (d->stream_event)
1544                         d->stream_event(d, event);
1545         }
1546 
1547         pop_dbg(dapm->dev, card->pop_time,
1548                 "DAPM sequencing finished, waiting %dms\n", card->pop_time);
1549         pop_wait(card->pop_time);
1550 
1551         trace_snd_soc_dapm_done(card);
1552 
1553         return 0;
1554 }
1555 
1556 #ifdef CONFIG_DEBUG_FS
1557 static ssize_t dapm_widget_power_read_file(struct file *file,
1558                                            char __user *user_buf,
1559                                            size_t count, loff_t *ppos)
1560 {
1561         struct snd_soc_dapm_widget *w = file->private_data;
1562         char *buf;
1563         int in, out;
1564         ssize_t ret;
1565         struct snd_soc_dapm_path *p = NULL;
1566 
1567         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1568         if (!buf)
1569                 return -ENOMEM;
1570 
1571         in = is_connected_input_ep(w);
1572         dapm_clear_walk(w->dapm);
1573         out = is_connected_output_ep(w);
1574         dapm_clear_walk(w->dapm);
1575 
1576         ret = snprintf(buf, PAGE_SIZE, "%s: %s%s  in %d out %d",
1577                        w->name, w->power ? "On" : "Off",
1578                        w->force ? " (forced)" : "", in, out);
1579 
1580         if (w->reg >= 0)
1581                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1582                                 " - R%d(0x%x) bit %d",
1583                                 w->reg, w->reg, w->shift);
1584 
1585         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
1586 
1587         if (w->sname)
1588                 ret += snprintf(buf + ret, PAGE_SIZE - ret, " stream %s %s\n",
1589                                 w->sname,
1590                                 w->active ? "active" : "inactive");
1591 
1592         list_for_each_entry(p, &w->sources, list_sink) {
1593                 if (p->connected && !p->connected(w, p->source))
1594                         continue;
1595 
1596                 if (p->connect)
1597                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
1598                                         " in  \"%s\" \"%s\"\n",
1599                                         p->name ? p->name : "static",
1600                                         p->source->name);
1601         }
1602         list_for_each_entry(p, &w->sinks, list_source) {
1603                 if (p->connected && !p->connected(w, p->sink))
1604                         continue;
1605 
1606                 if (p->connect)
1607                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
1608                                         " out \"%s\" \"%s\"\n",
1609                                         p->name ? p->name : "static",
1610                                         p->sink->name);
1611         }
1612 
1613         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1614 
1615         kfree(buf);
1616         return ret;
1617 }
1618 
1619 static const struct file_operations dapm_widget_power_fops = {
1620         .open = simple_open,
1621         .read = dapm_widget_power_read_file,
1622         .llseek = default_llseek,
1623 };
1624 
1625 static ssize_t dapm_bias_read_file(struct file *file, char __user *user_buf,
1626                                    size_t count, loff_t *ppos)
1627 {
1628         struct snd_soc_dapm_context *dapm = file->private_data;
1629         char *level;
1630 
1631         switch (dapm->bias_level) {
1632         case SND_SOC_BIAS_ON:
1633                 level = "On\n";
1634                 break;
1635         case SND_SOC_BIAS_PREPARE:
1636                 level = "Prepare\n";
1637                 break;
1638         case SND_SOC_BIAS_STANDBY:
1639                 level = "Standby\n";
1640                 break;
1641         case SND_SOC_BIAS_OFF:
1642                 level = "Off\n";
1643                 break;
1644         default:
1645                 BUG();
1646                 level = "Unknown\n";
1647                 break;
1648         }
1649 
1650         return simple_read_from_buffer(user_buf, count, ppos, level,
1651                                        strlen(level));
1652 }
1653 
1654 static const struct file_operations dapm_bias_fops = {
1655         .open = simple_open,
1656         .read = dapm_bias_read_file,
1657         .llseek = default_llseek,
1658 };
1659 
1660 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
1661         struct dentry *parent)
1662 {
1663         struct dentry *d;
1664 
1665         dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);
1666 
1667         if (!dapm->debugfs_dapm) {
1668                 dev_warn(dapm->dev,
1669                        "Failed to create DAPM debugfs directory\n");
1670                 return;
1671         }
1672 
1673         d = debugfs_create_file("bias_level", 0444,
1674                                 dapm->debugfs_dapm, dapm,
1675                                 &dapm_bias_fops);
1676         if (!d)
1677                 dev_warn(dapm->dev,
1678                          "ASoC: Failed to create bias level debugfs file\n");
1679 }
1680 
1681 static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
1682 {
1683         struct snd_soc_dapm_context *dapm = w->dapm;
1684         struct dentry *d;
1685 
1686         if (!dapm->debugfs_dapm || !w->name)
1687                 return;
1688 
1689         d = debugfs_create_file(w->name, 0444,
1690                                 dapm->debugfs_dapm, w,
1691                                 &dapm_widget_power_fops);
1692         if (!d)
1693                 dev_warn(w->dapm->dev,
1694                         "ASoC: Failed to create %s debugfs file\n",
1695                         w->name);
1696 }
1697 
1698 static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
1699 {
1700         debugfs_remove_recursive(dapm->debugfs_dapm);
1701 }
1702 
1703 #else
1704 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
1705         struct dentry *parent)
1706 {
1707 }
1708 
1709 static inline void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
1710 {
1711 }
1712 
1713 static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
1714 {
1715 }
1716 
1717 #endif
1718 
1719 /* test and update the power status of a mux widget */
1720 int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
1721                                  struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
1722 {
1723         struct snd_soc_dapm_path *path;
1724         int found = 0;
1725 
1726         if (widget->id != snd_soc_dapm_mux &&
1727             widget->id != snd_soc_dapm_virt_mux &&
1728             widget->id != snd_soc_dapm_value_mux)
1729                 return -ENODEV;
1730 
1731         /* find dapm widget path assoc with kcontrol */
1732         list_for_each_entry(path, &widget->dapm->card->paths, list) {
1733                 if (path->kcontrol != kcontrol)
1734                         continue;
1735 
1736                 if (!path->name || !e->texts[mux])
1737                         continue;
1738 
1739                 found = 1;
1740                 /* we now need to match the string in the enum to the path */
1741                 if (!(strcmp(path->name, e->texts[mux]))) {
1742                         path->connect = 1; /* new connection */
1743                         dapm_mark_dirty(path->source, "mux connection");
1744                 } else {
1745                         if (path->connect)
1746                                 dapm_mark_dirty(path->source,
1747                                                 "mux disconnection");
1748                         path->connect = 0; /* old connection must be powered down */
1749                 }
1750         }
1751 
1752         if (found) {
1753                 dapm_mark_dirty(widget, "mux change");
1754                 dapm_power_widgets(widget->dapm, SND_SOC_DAPM_STREAM_NOP);
1755         }
1756 
1757         return 0;
1758 }
1759 EXPORT_SYMBOL_GPL(snd_soc_dapm_mux_update_power);
1760 
1761 /* test and update the power status of a mixer or switch widget */
1762 int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
1763                                    struct snd_kcontrol *kcontrol, int connect)
1764 {
1765         struct snd_soc_dapm_path *path;
1766         int found = 0;
1767 
1768         if (widget->id != snd_soc_dapm_mixer &&
1769             widget->id != snd_soc_dapm_mixer_named_ctl &&
1770             widget->id != snd_soc_dapm_switch)
1771                 return -ENODEV;
1772 
1773         /* find dapm widget path assoc with kcontrol */
1774         list_for_each_entry(path, &widget->dapm->card->paths, list) {
1775                 if (path->kcontrol != kcontrol)
1776                         continue;
1777 
1778                 /* found, now check type */
1779                 found = 1;
1780                 path->connect = connect;
1781                 dapm_mark_dirty(path->source, "mixer connection");
1782         }
1783 
1784         if (found) {
1785                 dapm_mark_dirty(widget, "mixer update");
1786                 dapm_power_widgets(widget->dapm, SND_SOC_DAPM_STREAM_NOP);
1787         }
1788 
1789         return 0;
1790 }
1791 EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
1792 
1793 /* show dapm widget status in sys fs */
1794 static ssize_t dapm_widget_show(struct device *dev,
1795         struct device_attribute *attr, char *buf)
1796 {
1797         struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
1798         struct snd_soc_codec *codec =rtd->codec;
1799         struct snd_soc_dapm_widget *w;
1800         int count = 0;
1801         char *state = "not set";
1802 
1803         list_for_each_entry(w, &codec->card->widgets, list) {
1804                 if (w->dapm != &codec->dapm)
1805                         continue;
1806 
1807                 /* only display widgets that burnm power */
1808                 switch (w->id) {
1809                 case snd_soc_dapm_hp:
1810                 case snd_soc_dapm_mic:
1811                 case snd_soc_dapm_spk:
1812                 case snd_soc_dapm_line:
1813                 case snd_soc_dapm_micbias:
1814                 case snd_soc_dapm_dac:
1815                 case snd_soc_dapm_adc:
1816                 case snd_soc_dapm_pga:
1817                 case snd_soc_dapm_out_drv:
1818                 case snd_soc_dapm_mixer:
1819                 case snd_soc_dapm_mixer_named_ctl:
1820                 case snd_soc_dapm_supply:
1821                 case snd_soc_dapm_regulator_supply:
1822                         if (w->name)
1823                                 count += sprintf(buf + count, "%s: %s\n",
1824                                         w->name, w->power ? "On":"Off");
1825                 break;
1826                 default:
1827                 break;
1828                 }
1829         }
1830 
1831         switch (codec->dapm.bias_level) {
1832         case SND_SOC_BIAS_ON:
1833                 state = "On";
1834                 break;
1835         case SND_SOC_BIAS_PREPARE:
1836                 state = "Prepare";
1837                 break;
1838         case SND_SOC_BIAS_STANDBY:
1839                 state = "Standby";
1840                 break;
1841         case SND_SOC_BIAS_OFF:
1842                 state = "Off";
1843                 break;
1844         }
1845         count += sprintf(buf + count, "PM State: %s\n", state);
1846 
1847         return count;
1848 }
1849 
1850 static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);
1851 
1852 int snd_soc_dapm_sys_add(struct device *dev)
1853 {
1854         return device_create_file(dev, &dev_attr_dapm_widget);
1855 }
1856 
1857 static void snd_soc_dapm_sys_remove(struct device *dev)
1858 {
1859         device_remove_file(dev, &dev_attr_dapm_widget);
1860 }
1861 
1862 /* free all dapm widgets and resources */
1863 static void dapm_free_widgets(struct snd_soc_dapm_context *dapm)
1864 {
1865         struct snd_soc_dapm_widget *w, *next_w;
1866         struct snd_soc_dapm_path *p, *next_p;
1867 
1868         list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
1869                 if (w->dapm != dapm)
1870                         continue;
1871                 list_del(&w->list);
1872                 /*
1873                  * remove source and sink paths associated to this widget.
1874                  * While removing the path, remove reference to it from both
1875                  * source and sink widgets so that path is removed only once.
1876                  */
1877                 list_for_each_entry_safe(p, next_p, &w->sources, list_sink) {
1878                         list_del(&p->list_sink);
1879                         list_del(&p->list_source);
1880                         list_del(&p->list);
1881                         kfree(p->long_name);
1882                         kfree(p);
1883                 }
1884                 list_for_each_entry_safe(p, next_p, &w->sinks, list_source) {
1885                         list_del(&p->list_sink);
1886                         list_del(&p->list_source);
1887                         list_del(&p->list);
1888                         kfree(p->long_name);
1889                         kfree(p);
1890                 }
1891                 kfree(w->kcontrols);
1892                 kfree(w->name);
1893                 kfree(w);
1894         }
1895 }
1896 
1897 static struct snd_soc_dapm_widget *dapm_find_widget(
1898                         struct snd_soc_dapm_context *dapm, const char *pin,
1899                         bool search_other_contexts)
1900 {
1901         struct snd_soc_dapm_widget *w;
1902         struct snd_soc_dapm_widget *fallback = NULL;
1903 
1904         list_for_each_entry(w, &dapm->card->widgets, list) {
1905                 if (!strcmp(w->name, pin)) {
1906                         if (w->dapm == dapm)
1907                                 return w;
1908                         else
1909                                 fallback = w;
1910                 }
1911         }
1912 
1913         if (search_other_contexts)
1914                 return fallback;
1915 
1916         return NULL;
1917 }
1918 
1919 static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
1920                                 const char *pin, int status)
1921 {
1922         struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
1923 
1924         if (!w) {
1925                 dev_err(dapm->dev, "dapm: unknown pin %s\n", pin);
1926                 return -EINVAL;
1927         }
1928 
1929         if (w->connected != status)
1930                 dapm_mark_dirty(w, "pin configuration");
1931 
1932         w->connected = status;
1933         if (status == 0)
1934                 w->force = 0;
1935 
1936         return 0;
1937 }
1938 
1939 /**
1940  * snd_soc_dapm_sync - scan and power dapm paths
1941  * @dapm: DAPM context
1942  *
1943  * Walks all dapm audio paths and powers widgets according to their
1944  * stream or path usage.
1945  *
1946  * Returns 0 for success.
1947  */
1948 int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
1949 {
1950         /*
1951          * Suppress early reports (eg, jacks syncing their state) to avoid
1952          * silly DAPM runs during card startup.
1953          */
1954         if (!dapm->card || !dapm->card->instantiated)
1955                 return 0;
1956 
1957         return dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
1958 }
1959 EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
1960 
1961 static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
1962                                   const struct snd_soc_dapm_route *route)
1963 {
1964         struct snd_soc_dapm_path *path;
1965         struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
1966         struct snd_soc_dapm_widget *wtsource = NULL, *wtsink = NULL;
1967         const char *sink;
1968         const char *control = route->control;
1969         const char *source;
1970         char prefixed_sink[80];
1971         char prefixed_source[80];
1972         int ret = 0;
1973 
1974         if (dapm->codec && dapm->codec->name_prefix) {
1975                 snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
1976                          dapm->codec->name_prefix, route->sink);
1977                 sink = prefixed_sink;
1978                 snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
1979                          dapm->codec->name_prefix, route->source);
1980                 source = prefixed_source;
1981         } else {
1982                 sink = route->sink;
1983                 source = route->source;
1984         }
1985 
1986         /*
1987          * find src and dest widgets over all widgets but favor a widget from
1988          * current DAPM context
1989          */
1990         list_for_each_entry(w, &dapm->card->widgets, list) {
1991                 if (!wsink && !(strcmp(w->name, sink))) {
1992                         wtsink = w;
1993                         if (w->dapm == dapm)
1994                                 wsink = w;
1995                         continue;
1996                 }
1997                 if (!wsource && !(strcmp(w->name, source))) {
1998                         wtsource = w;
1999                         if (w->dapm == dapm)
2000                                 wsource = w;
2001                 }
2002         }
2003         /* use widget from another DAPM context if not found from this */
2004         if (!wsink)
2005                 wsink = wtsink;
2006         if (!wsource)
2007                 wsource = wtsource;
2008 
2009         if (wsource == NULL || wsink == NULL)
2010                 return -ENODEV;
2011 
2012         path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
2013         if (!path)
2014                 return -ENOMEM;
2015 
2016         path->source = wsource;
2017         path->sink = wsink;
2018         path->connected = route->connected;
2019         INIT_LIST_HEAD(&path->list);
2020         INIT_LIST_HEAD(&path->list_source);
2021         INIT_LIST_HEAD(&path->list_sink);
2022 
2023         /* check for external widgets */
2024         if (wsink->id == snd_soc_dapm_input) {
2025                 if (wsource->id == snd_soc_dapm_micbias ||
2026                         wsource->id == snd_soc_dapm_mic ||
2027                         wsource->id == snd_soc_dapm_line ||
2028                         wsource->id == snd_soc_dapm_output)
2029                         wsink->ext = 1;
2030         }
2031         if (wsource->id == snd_soc_dapm_output) {
2032                 if (wsink->id == snd_soc_dapm_spk ||
2033                         wsink->id == snd_soc_dapm_hp ||
2034                         wsink->id == snd_soc_dapm_line ||
2035                         wsink->id == snd_soc_dapm_input)
2036                         wsource->ext = 1;
2037         }
2038 
2039         /* connect static paths */
2040         if (control == NULL) {
2041                 list_add(&path->list, &dapm->card->paths);
2042                 list_add(&path->list_sink, &wsink->sources);
2043                 list_add(&path->list_source, &wsource->sinks);
2044                 path->connect = 1;
2045                 return 0;
2046         }
2047 
2048         /* connect dynamic paths */
2049         switch (wsink->id) {
2050         case snd_soc_dapm_adc:
2051         case snd_soc_dapm_dac:
2052         case snd_soc_dapm_pga:
2053         case snd_soc_dapm_out_drv:
2054         case snd_soc_dapm_input:
2055         case snd_soc_dapm_output:
2056         case snd_soc_dapm_siggen:
2057         case snd_soc_dapm_micbias:
2058         case snd_soc_dapm_vmid:
2059         case snd_soc_dapm_pre:
2060         case snd_soc_dapm_post:
2061         case snd_soc_dapm_supply:
2062         case snd_soc_dapm_regulator_supply:
2063         case snd_soc_dapm_aif_in:
2064         case snd_soc_dapm_aif_out:
2065         case snd_soc_dapm_dai:
2066                 list_add(&path->list, &dapm->card->paths);
2067                 list_add(&path->list_sink, &wsink->sources);
2068                 list_add(&path->list_source, &wsource->sinks);
2069                 path->connect = 1;
2070                 return 0;
2071         case snd_soc_dapm_mux:
2072         case snd_soc_dapm_virt_mux:
2073         case snd_soc_dapm_value_mux:
2074                 ret = dapm_connect_mux(dapm, wsource, wsink, path, control,
2075                         &wsink->kcontrol_news[0]);
2076                 if (ret != 0)
2077                         goto err;
2078                 break;
2079         case snd_soc_dapm_switch:
2080         case snd_soc_dapm_mixer:
2081         case snd_soc_dapm_mixer_named_ctl:
2082                 ret = dapm_connect_mixer(dapm, wsource, wsink, path, control);
2083                 if (ret != 0)
2084                         goto err;
2085                 break;
2086         case snd_soc_dapm_hp:
2087         case snd_soc_dapm_mic:
2088         case snd_soc_dapm_line:
2089         case snd_soc_dapm_spk:
2090                 list_add(&path->list, &dapm->card->paths);
2091                 list_add(&path->list_sink, &wsink->sources);
2092                 list_add(&path->list_source, &wsource->sinks);
2093                 path->connect = 0;
2094                 return 0;
2095         }
2096         return 0;
2097 
2098 err:
2099         dev_warn(dapm->dev, "asoc: no dapm match for %s --> %s --> %s\n",
2100                  source, control, sink);
2101         kfree(path);
2102         return ret;
2103 }
2104 
2105 /**
2106  * snd_soc_dapm_add_routes - Add routes between DAPM widgets
2107  * @dapm: DAPM context
2108  * @route: audio routes
2109  * @num: number of routes
2110  *
2111  * Connects 2 dapm widgets together via a named audio path. The sink is
2112  * the widget receiving the audio signal, whilst the source is the sender
2113  * of the audio signal.
2114  *
2115  * Returns 0 for success else error. On error all resources can be freed
2116  * with a call to snd_soc_card_free().
2117  */
2118 int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
2119                             const struct snd_soc_dapm_route *route, int num)
2120 {
2121         int i, ret;
2122 
2123         for (i = 0; i < num; i++) {
2124                 ret = snd_soc_dapm_add_route(dapm, route);
2125                 if (ret < 0) {
2126                         dev_err(dapm->dev, "Failed to add route %s->%s\n",
2127                                 route->source, route->sink);
2128                         return ret;
2129                 }
2130                 route++;
2131         }
2132 
2133         return 0;
2134 }
2135 EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);
2136 
2137 static int snd_soc_dapm_weak_route(struct snd_soc_dapm_context *dapm,
2138                                    const struct snd_soc_dapm_route *route)
2139 {
2140         struct snd_soc_dapm_widget *source = dapm_find_widget(dapm,
2141                                                               route->source,
2142                                                               true);
2143         struct snd_soc_dapm_widget *sink = dapm_find_widget(dapm,
2144                                                             route->sink,
2145                                                             true);
2146         struct snd_soc_dapm_path *path;
2147         int count = 0;
2148 
2149         if (!source) {
2150                 dev_err(dapm->dev, "Unable to find source %s for weak route\n",
2151                         route->source);
2152                 return -ENODEV;
2153         }
2154 
2155         if (!sink) {
2156                 dev_err(dapm->dev, "Unable to find sink %s for weak route\n",
2157                         route->sink);
2158                 return -ENODEV;
2159         }
2160 
2161         if (route->control || route->connected)
2162                 dev_warn(dapm->dev, "Ignoring control for weak route %s->%s\n",
2163                          route->source, route->sink);
2164 
2165         list_for_each_entry(path, &source->sinks, list_source) {
2166                 if (path->sink == sink) {
2167                         path->weak = 1;
2168                         count++;
2169                 }
2170         }
2171 
2172         if (count == 0)
2173                 dev_err(dapm->dev, "No path found for weak route %s->%s\n",
2174                         route->source, route->sink);
2175         if (count > 1)
2176                 dev_warn(dapm->dev, "%d paths found for weak route %s->%s\n",
2177                          count, route->source, route->sink);
2178 
2179         return 0;
2180 }
2181 
2182 /**
2183  * snd_soc_dapm_weak_routes - Mark routes between DAPM widgets as weak
2184  * @dapm: DAPM context
2185  * @route: audio routes
2186  * @num: number of routes
2187  *
2188  * Mark existing routes matching those specified in the passed array
2189  * as being weak, meaning that they are ignored for the purpose of
2190  * power decisions.  The main intended use case is for sidetone paths
2191  * which couple audio between other independent paths if they are both
2192  * active in order to make the combination work better at the user
2193  * level but which aren't intended to be "used".
2194  *
2195  * Note that CODEC drivers should not use this as sidetone type paths
2196  * can frequently also be used as bypass paths.
2197  */
2198 int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
2199                              const struct snd_soc_dapm_route *route, int num)
2200 {
2201         int i, err;
2202         int ret = 0;
2203 
2204         for (i = 0; i < num; i++) {
2205                 err = snd_soc_dapm_weak_route(dapm, route);
2206                 if (err)
2207                         ret = err;
2208                 route++;
2209         }
2210 
2211         return ret;
2212 }
2213 EXPORT_SYMBOL_GPL(snd_soc_dapm_weak_routes);
2214 
2215 /**
2216  * snd_soc_dapm_new_widgets - add new dapm widgets
2217  * @dapm: DAPM context
2218  *
2219  * Checks the codec for any new dapm widgets and creates them if found.
2220  *
2221  * Returns 0 for success.
2222  */
2223 int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
2224 {
2225         struct snd_soc_dapm_widget *w;
2226         unsigned int val;
2227 
2228         list_for_each_entry(w, &dapm->card->widgets, list)
2229         {
2230                 if (w->new)
2231                         continue;
2232 
2233                 if (w->num_kcontrols) {
2234                         w->kcontrols = kzalloc(w->num_kcontrols *
2235                                                 sizeof(struct snd_kcontrol *),
2236                                                 GFP_KERNEL);
2237                         if (!w->kcontrols)
2238                                 return -ENOMEM;
2239                 }
2240 
2241                 switch(w->id) {
2242                 case snd_soc_dapm_switch:
2243                 case snd_soc_dapm_mixer:
2244                 case snd_soc_dapm_mixer_named_ctl:
2245                         dapm_new_mixer(w);
2246                         break;
2247                 case snd_soc_dapm_mux:
2248                 case snd_soc_dapm_virt_mux:
2249                 case snd_soc_dapm_value_mux:
2250                         dapm_new_mux(w);
2251                         break;
2252                 case snd_soc_dapm_pga:
2253                 case snd_soc_dapm_out_drv:
2254                         dapm_new_pga(w);
2255                         break;
2256                 default:
2257                         break;
2258                 }
2259 
2260                 /* Read the initial power state from the device */
2261                 if (w->reg >= 0) {
2262                         val = soc_widget_read(w, w->reg);
2263                         val &= 1 << w->shift;
2264                         if (w->invert)
2265                                 val = !val;
2266 
2267                         if (val)
2268                                 w->power = 1;
2269                 }
2270 
2271                 w->new = 1;
2272 
2273                 dapm_mark_dirty(w, "new widget");
2274                 dapm_debugfs_add_widget(w);
2275         }
2276 
2277         dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
2278         return 0;
2279 }
2280 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);
2281 
2282 /**
2283  * snd_soc_dapm_get_volsw - dapm mixer get callback
2284  * @kcontrol: mixer control
2285  * @ucontrol: control element information
2286  *
2287  * Callback to get the value of a dapm mixer control.
2288  *
2289  * Returns 0 for success.
2290  */
2291 int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
2292         struct snd_ctl_elem_value *ucontrol)
2293 {
2294         struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2295         struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2296         struct soc_mixer_control *mc =
2297                 (struct soc_mixer_control *)kcontrol->private_value;
2298         unsigned int reg = mc->reg;
2299         unsigned int shift = mc->shift;
2300         unsigned int rshift = mc->rshift;
2301         int max = mc->max;
2302         unsigned int invert = mc->invert;
2303         unsigned int mask = (1 << fls(max)) - 1;
2304 
2305         ucontrol->value.integer.value[0] =
2306                 (snd_soc_read(widget->codec, reg) >> shift) & mask;
2307         if (shift != rshift)
2308                 ucontrol->value.integer.value[1] =
2309                         (snd_soc_read(widget->codec, reg) >> rshift) & mask;
2310         if (invert) {
2311                 ucontrol->value.integer.value[0] =
2312                         max - ucontrol->value.integer.value[0];
2313                 if (shift != rshift)
2314                         ucontrol->value.integer.value[1] =
2315                                 max - ucontrol->value.integer.value[1];
2316         }
2317 
2318         return 0;
2319 }
2320 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_volsw);
2321 
2322 /**
2323  * snd_soc_dapm_put_volsw - dapm mixer set callback
2324  * @kcontrol: mixer control
2325  * @ucontrol: control element information
2326  *
2327  * Callback to set the value of a dapm mixer control.
2328  *
2329  * Returns 0 for success.
2330  */
2331 int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
2332         struct snd_ctl_elem_value *ucontrol)
2333 {
2334         struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2335         struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2336         struct snd_soc_codec *codec = widget->codec;
2337         struct soc_mixer_control *mc =
2338                 (struct soc_mixer_control *)kcontrol->private_value;
2339         unsigned int reg = mc->reg;
2340         unsigned int shift = mc->shift;
2341         int max = mc->max;
2342         unsigned int mask = (1 << fls(max)) - 1;
2343         unsigned int invert = mc->invert;
2344         unsigned int val;
2345         int connect, change;
2346         struct snd_soc_dapm_update update;
2347         int wi;
2348 
2349         val = (ucontrol->value.integer.value[0] & mask);
2350 
2351         if (invert)
2352                 val = max - val;
2353         mask = mask << shift;
2354         val = val << shift;
2355 
2356         if (val)
2357                 /* new connection */
2358                 connect = invert ? 0 : 1;
2359         else
2360                 /* old connection must be powered down */
2361                 connect = invert ? 1 : 0;
2362 
2363         mutex_lock(&codec->mutex);
2364 
2365         change = snd_soc_test_bits(widget->codec, reg, mask, val);
2366         if (change) {
2367                 for (wi = 0; wi < wlist->num_widgets; wi++) {
2368                         widget = wlist->widgets[wi];
2369 
2370                         widget->value = val;
2371 
2372                         update.kcontrol = kcontrol;
2373                         update.widget = widget;
2374                         update.reg = reg;
2375                         update.mask = mask;
2376                         update.val = val;
2377                         widget->dapm->update = &update;
2378 
2379                         snd_soc_dapm_mixer_update_power(widget, kcontrol, connect);
2380 
2381                         widget->dapm->update = NULL;
2382                 }
2383         }
2384 
2385         mutex_unlock(&codec->mutex);
2386         return 0;
2387 }
2388 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);
2389 
2390 /**
2391  * snd_soc_dapm_get_enum_double - dapm enumerated double mixer get callback
2392  * @kcontrol: mixer control
2393  * @ucontrol: control element information
2394  *
2395  * Callback to get the value of a dapm enumerated double mixer control.
2396  *
2397  * Returns 0 for success.
2398  */
2399 int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
2400         struct snd_ctl_elem_value *ucontrol)
2401 {
2402         struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2403         struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2404         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2405         unsigned int val, bitmask;
2406 
2407         for (bitmask = 1; bitmask < e->max; bitmask <<= 1)
2408                 ;
2409         val = snd_soc_read(widget->codec, e->reg);
2410         ucontrol->value.enumerated.item[0] = (val >> e->shift_l) & (bitmask - 1);
2411         if (e->shift_l != e->shift_r)
2412                 ucontrol->value.enumerated.item[1] =
2413                         (val >> e->shift_r) & (bitmask - 1);
2414 
2415         return 0;
2416 }
2417 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);
2418 
2419 /**
2420  * snd_soc_dapm_put_enum_double - dapm enumerated double mixer set callback
2421  * @kcontrol: mixer control
2422  * @ucontrol: control element information
2423  *
2424  * Callback to set the value of a dapm enumerated double mixer control.
2425  *
2426  * Returns 0 for success.
2427  */
2428 int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
2429         struct snd_ctl_elem_value *ucontrol)
2430 {
2431         struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2432         struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2433         struct snd_soc_codec *codec = widget->codec;
2434         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2435         unsigned int val, mux, change;
2436         unsigned int mask, bitmask;
2437         struct snd_soc_dapm_update update;
2438         int wi;
2439 
2440         for (bitmask = 1; bitmask < e->max; bitmask <<= 1)
2441                 ;
2442         if (ucontrol->value.enumerated.item[0] > e->max - 1)
2443                 return -EINVAL;
2444         mux = ucontrol->value.enumerated.item[0];
2445         val = mux << e->shift_l;
2446         mask = (bitmask - 1) << e->shift_l;
2447         if (e->shift_l != e->shift_r) {
2448                 if (ucontrol->value.enumerated.item[1] > e->max - 1)
2449                         return -EINVAL;
2450                 val |= ucontrol->value.enumerated.item[1] << e->shift_r;
2451                 mask |= (bitmask - 1) << e->shift_r;
2452         }
2453 
2454         mutex_lock(&codec->mutex);
2455 
2456         change = snd_soc_test_bits(widget->codec, e->reg, mask, val);
2457         if (change) {
2458                 for (wi = 0; wi < wlist->num_widgets; wi++) {
2459                         widget = wlist->widgets[wi];
2460 
2461                         widget->value = val;
2462 
2463                         update.kcontrol = kcontrol;
2464                         update.widget = widget;
2465                         update.reg = e->reg;
2466                         update.mask = mask;
2467                         update.val = val;
2468                         widget->dapm->update = &update;
2469 
2470                         snd_soc_dapm_mux_update_power(widget, kcontrol, mux, e);
2471 
2472                         widget->dapm->update = NULL;
2473                 }
2474         }
2475 
2476         mutex_unlock(&codec->mutex);
2477         return change;
2478 }
2479 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
2480 
2481 /**
2482  * snd_soc_dapm_get_enum_virt - Get virtual DAPM mux
2483  * @kcontrol: mixer control
2484  * @ucontrol: control element information
2485  *
2486  * Returns 0 for success.
2487  */
2488 int snd_soc_dapm_get_enum_virt(struct snd_kcontrol *kcontrol,
2489                                struct snd_ctl_elem_value *ucontrol)
2490 {
2491         struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2492         struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2493 
2494         ucontrol->value.enumerated.item[0] = widget->value;
2495 
2496         return 0;
2497 }
2498 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_virt);
2499 
2500 /**
2501  * snd_soc_dapm_put_enum_virt - Set virtual DAPM mux
2502  * @kcontrol: mixer control
2503  * @ucontrol: control element information
2504  *
2505  * Returns 0 for success.
2506  */
2507 int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
2508                                struct snd_ctl_elem_value *ucontrol)
2509 {
2510         struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2511         struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2512         struct snd_soc_codec *codec = widget->codec;
2513         struct soc_enum *e =
2514                 (struct soc_enum *)kcontrol->private_value;
2515         int change;
2516         int ret = 0;
2517         int wi;
2518 
2519         if (ucontrol->value.enumerated.item[0] >= e->max)
2520                 return -EINVAL;
2521 
2522         mutex_lock(&codec->mutex);
2523 
2524         change = widget->value != ucontrol->value.enumerated.item[0];
2525         if (change) {
2526                 for (wi = 0; wi < wlist->num_widgets; wi++) {
2527                         widget = wlist->widgets[wi];
2528 
2529                         widget->value = ucontrol->value.enumerated.item[0];
2530 
2531                         snd_soc_dapm_mux_update_power(widget, kcontrol, widget->value, e);
2532                 }
2533         }
2534 
2535         mutex_unlock(&codec->mutex);
2536         return ret;
2537 }
2538 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_virt);
2539 
2540 /**
2541  * snd_soc_dapm_get_value_enum_double - dapm semi enumerated double mixer get
2542  *                                      callback
2543  * @kcontrol: mixer control
2544  * @ucontrol: control element information
2545  *
2546  * Callback to get the value of a dapm semi enumerated double mixer control.
2547  *
2548  * Semi enumerated mixer: the enumerated items are referred as values. Can be
2549  * used for handling bitfield coded enumeration for example.
2550  *
2551  * Returns 0 for success.
2552  */
2553 int snd_soc_dapm_get_value_enum_double(struct snd_kcontrol *kcontrol,
2554         struct snd_ctl_elem_value *ucontrol)
2555 {
2556         struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2557         struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2558         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2559         unsigned int reg_val, val, mux;
2560 
2561         reg_val = snd_soc_read(widget->codec, e->reg);
2562         val = (reg_val >> e->shift_l) & e->mask;
2563         for (mux = 0; mux < e->max; mux++) {
2564                 if (val == e->values[mux])
2565                         break;
2566         }
2567         ucontrol->value.enumerated.item[0] = mux;
2568         if (e->shift_l != e->shift_r) {
2569                 val = (reg_val >> e->shift_r) & e->mask;
2570                 for (mux = 0; mux < e->max; mux++) {
2571                         if (val == e->values[mux])
2572                                 break;
2573                 }
2574                 ucontrol->value.enumerated.item[1] = mux;
2575         }
2576 
2577         return 0;
2578 }
2579 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_value_enum_double);
2580 
2581 /**
2582  * snd_soc_dapm_put_value_enum_double - dapm semi enumerated double mixer set
2583  *                                      callback
2584  * @kcontrol: mixer control
2585  * @ucontrol: control element information
2586  *
2587  * Callback to set the value of a dapm semi enumerated double mixer control.
2588  *
2589  * Semi enumerated mixer: the enumerated items are referred as values. Can be
2590  * used for handling bitfield coded enumeration for example.
2591  *
2592  * Returns 0 for success.
2593  */
2594 int snd_soc_dapm_put_value_enum_double(struct snd_kcontrol *kcontrol,
2595         struct snd_ctl_elem_value *ucontrol)
2596 {
2597         struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2598         struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2599         struct snd_soc_codec *codec = widget->codec;
2600         struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2601         unsigned int val, mux, change;
2602         unsigned int mask;
2603         struct snd_soc_dapm_update update;
2604         int wi;
2605 
2606         if (ucontrol->value.enumerated.item[0] > e->max - 1)
2607                 return -EINVAL;
2608         mux = ucontrol->value.enumerated.item[0];
2609         val = e->values[ucontrol->value.enumerated.item[0]] << e->shift_l;
2610         mask = e->mask << e->shift_l;
2611         if (e->shift_l != e->shift_r) {
2612                 if (ucontrol->value.enumerated.item[1] > e->max - 1)
2613                         return -EINVAL;
2614                 val |= e->values[ucontrol->value.enumerated.item[1]] << e->shift_r;
2615                 mask |= e->mask << e->shift_r;
2616         }
2617 
2618         mutex_lock(&codec->mutex);
2619 
2620         change = snd_soc_test_bits(widget->codec, e->reg, mask, val);
2621         if (change) {
2622                 for (wi = 0; wi < wlist->num_widgets; wi++) {
2623                         widget = wlist->widgets[wi];
2624 
2625                         widget->value = val;
2626 
2627                         update.kcontrol = kcontrol;
2628                         update.widget = widget;
2629                         update.reg = e->reg;
2630                         update.mask = mask;
2631                         update.val = val;
2632                         widget->dapm->update = &update;
2633 
2634                         snd_soc_dapm_mux_update_power(widget, kcontrol, mux, e);
2635 
2636                         widget->dapm->update = NULL;
2637                 }
2638         }
2639 
2640         mutex_unlock(&codec->mutex);
2641         return change;
2642 }
2643 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_value_enum_double);
2644 
2645 /**
2646  * snd_soc_dapm_info_pin_switch - Info for a pin switch
2647  *
2648  * @kcontrol: mixer control
2649  * @uinfo: control element information
2650  *
2651  * Callback to provide information about a pin switch control.
2652  */
2653 int snd_soc_dapm_info_pin_switch(struct snd_kcontrol *kcontrol,
2654                                  struct snd_ctl_elem_info *uinfo)
2655 {
2656         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
2657         uinfo->count = 1;
2658         uinfo->value.integer.min = 0;
2659         uinfo->value.integer.max = 1;
2660 
2661         return 0;
2662 }
2663 EXPORT_SYMBOL_GPL(snd_soc_dapm_info_pin_switch);
2664 
2665 /**
2666  * snd_soc_dapm_get_pin_switch - Get information for a pin switch
2667  *
2668  * @kcontrol: mixer control
2669  * @ucontrol: Value
2670  */
2671 int snd_soc_dapm_get_pin_switch(struct snd_kcontrol *kcontrol,
2672                                 struct snd_ctl_elem_value *ucontrol)
2673 {
2674         struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
2675         const char *pin = (const char *)kcontrol->private_value;
2676 
2677         mutex_lock(&card->mutex);
2678 
2679         ucontrol->value.integer.value[0] =
2680                 snd_soc_dapm_get_pin_status(&card->dapm, pin);
2681 
2682         mutex_unlock(&card->mutex);
2683 
2684         return 0;
2685 }
2686 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_switch);
2687 
2688 /**
2689  * snd_soc_dapm_put_pin_switch - Set information for a pin switch
2690  *
2691  * @kcontrol: mixer control
2692  * @ucontrol: Value
2693  */
2694 int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
2695                                 struct snd_ctl_elem_value *ucontrol)
2696 {
2697         struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
2698         const char *pin = (const char *)kcontrol->private_value;
2699 
2700         mutex_lock(&card->mutex);
2701 
2702         if (ucontrol->value.integer.value[0])
2703                 snd_soc_dapm_enable_pin(&card->dapm, pin);
2704         else
2705                 snd_soc_dapm_disable_pin(&card->dapm, pin);
2706 
2707         snd_soc_dapm_sync(&card->dapm);
2708 
2709         mutex_unlock(&card->mutex);
2710 
2711         return 0;
2712 }
2713 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
2714 
2715 static struct snd_soc_dapm_widget *
2716 snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
2717                          const struct snd_soc_dapm_widget *widget)
2718 {
2719         struct snd_soc_dapm_widget *w;
2720         size_t name_len;
2721         int ret;
2722 
2723         if ((w = dapm_cnew_widget(widget)) == NULL)
2724                 return NULL;
2725 
2726         switch (w->id) {
2727         case snd_soc_dapm_regulator_supply:
2728                 w->priv = devm_regulator_get(dapm->dev, w->name);
2729                 if (IS_ERR(w->priv)) {
2730                         ret = PTR_ERR(w->priv);
2731                         dev_err(dapm->dev, "Failed to request %s: %d\n",
2732                                 w->name, ret);
2733                         return NULL;
2734                 }
2735                 break;
2736         default:
2737                 break;
2738         }
2739 
2740         name_len = strlen(widget->name) + 1;
2741         if (dapm->codec && dapm->codec->name_prefix)
2742                 name_len += 1 + strlen(dapm->codec->name_prefix);
2743         w->name = kmalloc(name_len, GFP_KERNEL);
2744         if (w->name == NULL) {
2745                 kfree(w);
2746                 return NULL;
2747         }
2748         if (dapm->codec && dapm->codec->name_prefix)
2749                 snprintf((char *)w->name, name_len, "%s %s",
2750                         dapm->codec->name_prefix, widget->name);
2751         else
2752                 snprintf((char *)w->name, name_len, "%s", widget->name);
2753 
2754         switch (w->id) {
2755         case snd_soc_dapm_switch:
2756         case snd_soc_dapm_mixer:
2757         case snd_soc_dapm_mixer_named_ctl:
2758                 w->power_check = dapm_generic_check_power;
2759                 break;
2760         case snd_soc_dapm_mux:
2761         case snd_soc_dapm_virt_mux:
2762         case snd_soc_dapm_value_mux:
2763                 w->power_check = dapm_generic_check_power;
2764                 break;
2765         case snd_soc_dapm_adc:
2766         case snd_soc_dapm_aif_out:
2767                 w->power_check = dapm_adc_check_power;
2768                 break;
2769         case snd_soc_dapm_dac:
2770         case snd_soc_dapm_aif_in:
2771                 w->power_check = dapm_dac_check_power;
2772                 break;
2773         case snd_soc_dapm_pga:
2774         case snd_soc_dapm_out_drv:
2775         case snd_soc_dapm_input:
2776         case snd_soc_dapm_output:
2777         case snd_soc_dapm_micbias:
2778         case snd_soc_dapm_spk:
2779         case snd_soc_dapm_hp:
2780         case snd_soc_dapm_mic:
2781         case snd_soc_dapm_line:
2782                 w->power_check = dapm_generic_check_power;
2783                 break;
2784         case snd_soc_dapm_supply:
2785         case snd_soc_dapm_regulator_supply:
2786                 w->power_check = dapm_supply_check_power;
2787                 break;
2788         case snd_soc_dapm_dai:
2789                 w->power_check = dapm_dai_check_power;
2790                 break;
2791         default:
2792                 w->power_check = dapm_always_on_check_power;
2793                 break;
2794         }
2795 
2796         dapm->n_widgets++;
2797         w->dapm = dapm;
2798         w->codec = dapm->codec;
2799         w->platform = dapm->platform;
2800         INIT_LIST_HEAD(&w->sources);
2801         INIT_LIST_HEAD(&w->sinks);
2802         INIT_LIST_HEAD(&w->list);
2803         INIT_LIST_HEAD(&w->dirty);
2804         list_add(&w->list, &dapm->card->widgets);
2805 
2806         /* machine layer set ups unconnected pins and insertions */
2807         w->connected = 1;
2808         return w;
2809 }
2810 
2811 /**
2812  * snd_soc_dapm_new_controls - create new dapm controls
2813  * @dapm: DAPM context
2814  * @widget: widget array
2815  * @num: number of widgets
2816  *
2817  * Creates new DAPM controls based upon the templates.
2818  *
2819  * Returns 0 for success else error.
2820  */
2821 int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
2822         const struct snd_soc_dapm_widget *widget,
2823         int num)
2824 {
2825         struct snd_soc_dapm_widget *w;
2826         int i;
2827 
2828         for (i = 0; i < num; i++) {
2829                 w = snd_soc_dapm_new_control(dapm, widget);
2830                 if (!w) {
2831                         dev_err(dapm->dev,
2832                                 "ASoC: Failed to create DAPM control %s\n",
2833                                 widget->name);
2834                         return -ENOMEM;
2835                 }
2836                 widget++;
2837         }
2838         return 0;
2839 }
2840 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);
2841 
2842 int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm,
2843                                  struct snd_soc_dai *dai)
2844 {
2845         struct snd_soc_dapm_widget template;
2846         struct snd_soc_dapm_widget *w;
2847 
2848         WARN_ON(dapm->dev != dai->dev);
2849 
2850         memset(&template, 0, sizeof(template));
2851         template.reg = SND_SOC_NOPM;
2852 
2853         if (dai->driver->playback.stream_name) {
2854                 template.id = snd_soc_dapm_dai;
2855                 template.name = dai->driver->playback.stream_name;
2856                 template.sname = dai->driver->playback.stream_name;
2857 
2858                 dev_dbg(dai->dev, "adding %s widget\n",
2859                         template.name);
2860 
2861                 w = snd_soc_dapm_new_control(dapm, &template);
2862                 if (!w) {
2863                         dev_err(dapm->dev, "Failed to create %s widget\n",
2864                                 dai->driver->playback.stream_name);
2865                 }
2866 
2867                 w->priv = dai;
2868                 dai->playback_widget = w;
2869         }
2870 
2871         if (dai->driver->capture.stream_name) {
2872                 template.id = snd_soc_dapm_dai;
2873                 template.name = dai->driver->capture.stream_name;
2874                 template.sname = dai->driver->capture.stream_name;
2875 
2876                 dev_dbg(dai->dev, "adding %s widget\n",
2877                         template.name);
2878 
2879                 w = snd_soc_dapm_new_control(dapm, &template);
2880                 if (!w) {
2881                         dev_err(dapm->dev, "Failed to create %s widget\n",
2882                                 dai->driver->capture.stream_name);
2883                 }
2884 
2885                 w->priv = dai;
2886                 dai->capture_widget = w;
2887         }
2888 
2889         return 0;
2890 }
2891 
2892 int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card)
2893 {
2894         struct snd_soc_dapm_widget *dai_w, *w;
2895         struct snd_soc_dai *dai;
2896         struct snd_soc_dapm_route r;
2897 
2898         memset(&r, 0, sizeof(r));
2899 
2900         /* For each DAI widget... */
2901         list_for_each_entry(dai_w, &card->widgets, list) {
2902                 if (dai_w->id != snd_soc_dapm_dai)
2903                         continue;
2904 
2905                 dai = dai_w->priv;
2906 
2907                 /* ...find all widgets with the same stream and link them */
2908                 list_for_each_entry(w, &card->widgets, list) {
2909                         if (w->dapm != dai_w->dapm)
2910                                 continue;
2911 
2912                         if (w->id == snd_soc_dapm_dai)
2913                                 continue;
2914 
2915                         if (!w->sname)
2916                                 continue;
2917 
2918                         if (dai->driver->playback.stream_name &&
2919                             strstr(w->sname,
2920                                    dai->driver->playback.stream_name)) {
2921                                 r.source = dai->playback_widget->name;
2922                                 r.sink = w->name;
2923                                 dev_dbg(dai->dev, "%s -> %s\n",
2924                                          r.source, r.sink);
2925 
2926                                 snd_soc_dapm_add_route(w->dapm, &r);
2927                         }
2928 
2929                         if (dai->driver->capture.stream_name &&
2930                             strstr(w->sname,
2931                                    dai->driver->capture.stream_name)) {
2932                                 r.source = w->name;
2933                                 r.sink = dai->capture_widget->name;
2934                                 dev_dbg(dai->dev, "%s -> %s\n",
2935                                         r.source, r.sink);
2936 
2937                                 snd_soc_dapm_add_route(w->dapm, &r);
2938                         }
2939                 }
2940         }
2941 
2942         return 0;
2943 }
2944 
2945 static void soc_dapm_stream_event(struct snd_soc_dapm_context *dapm,
2946                                   int stream, struct snd_soc_dai *dai,
2947                                   int event)
2948 {
2949         struct snd_soc_dapm_widget *w;
2950 
2951         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2952                 w = dai->playback_widget;
2953         else
2954                 w = dai->capture_widget;
2955 
2956         if (!w)
2957                 return;
2958 
2959         dapm_mark_dirty(w, "stream event");
2960 
2961         switch (event) {
2962         case SND_SOC_DAPM_STREAM_START:
2963                 w->active = 1;
2964                 break;
2965         case SND_SOC_DAPM_STREAM_STOP:
2966                 w->active = 0;
2967                 break;
2968         case SND_SOC_DAPM_STREAM_SUSPEND:
2969         case SND_SOC_DAPM_STREAM_RESUME:
2970         case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
2971         case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
2972                 break;
2973         }
2974 
2975         dapm_power_widgets(dapm, event);
2976 }
2977 
2978 /**
2979  * snd_soc_dapm_stream_event - send a stream event to the dapm core
2980  * @rtd: PCM runtime data
2981  * @stream: stream name
2982  * @event: stream event
2983  *
2984  * Sends a stream event to the dapm core. The core then makes any
2985  * necessary widget power changes.
2986  *
2987  * Returns 0 for success else error.
2988  */
2989 int snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
2990                               struct snd_soc_dai *dai, int event)
2991 {
2992         struct snd_soc_codec *codec = rtd->codec;
2993 
2994         mutex_lock(&codec->mutex);
2995         soc_dapm_stream_event(&codec->dapm, stream, dai, event);
2996         mutex_unlock(&codec->mutex);
2997         return 0;
2998 }
2999 
3000 /**
3001  * snd_soc_dapm_enable_pin - enable pin.
3002  * @dapm: DAPM context
3003  * @pin: pin name
3004  *
3005  * Enables input/output pin and its parents or children widgets iff there is
3006  * a valid audio route and active audio stream.
3007  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3008  * do any widget power switching.
3009  */
3010 int snd_soc_dapm_enable_pin(struct snd_soc_dapm_context *dapm, const char *pin)
3011 {
3012         return snd_soc_dapm_set_pin(dapm, pin, 1);
3013 }
3014 EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);
3015 
3016 /**
3017  * snd_soc_dapm_force_enable_pin - force a pin to be enabled
3018  * @dapm: DAPM context
3019  * @pin: pin name
3020  *
3021  * Enables input/output pin regardless of any other state.  This is
3022  * intended for use with microphone bias supplies used in microphone
3023  * jack detection.
3024  *
3025  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3026  * do any widget power switching.
3027  */
3028 int snd_soc_dapm_force_enable_pin(struct snd_soc_dapm_context *dapm,
3029                                   const char *pin)
3030 {
3031         struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
3032 
3033         if (!w) {
3034                 dev_err(dapm->dev, "dapm: unknown pin %s\n", pin);
3035                 return -EINVAL;
3036         }
3037 
3038         dev_dbg(w->dapm->dev, "dapm: force enable pin %s\n", pin);
3039         w->connected = 1;
3040         w->force = 1;
3041         dapm_mark_dirty(w, "force enable");
3042 
3043         return 0;
3044 }
3045 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin);
3046 
3047 /**
3048  * snd_soc_dapm_disable_pin - disable pin.
3049  * @dapm: DAPM context
3050  * @pin: pin name
3051  *
3052  * Disables input/output pin and its parents or children widgets.
3053  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3054  * do any widget power switching.
3055  */
3056 int snd_soc_dapm_disable_pin(struct snd_soc_dapm_context *dapm,
3057                              const char *pin)
3058 {
3059         return snd_soc_dapm_set_pin(dapm, pin, 0);
3060 }
3061 EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin);
3062 
3063 /**
3064  * snd_soc_dapm_nc_pin - permanently disable pin.
3065  * @dapm: DAPM context
3066  * @pin: pin name
3067  *
3068  * Marks the specified pin as being not connected, disabling it along
3069  * any parent or child widgets.  At present this is identical to
3070  * snd_soc_dapm_disable_pin() but in future it will be extended to do
3071  * additional things such as disabling controls which only affect
3072  * paths through the pin.
3073  *
3074  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3075  * do any widget power switching.
3076  */
3077 int snd_soc_dapm_nc_pin(struct snd_soc_dapm_context *dapm, const char *pin)
3078 {
3079         return snd_soc_dapm_set_pin(dapm, pin, 0);
3080 }
3081 EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin);
3082 
3083 /**
3084  * snd_soc_dapm_get_pin_status - get audio pin status
3085  * @dapm: DAPM context
3086  * @pin: audio signal pin endpoint (or start point)
3087  *
3088  * Get audio pin status - connected or disconnected.
3089  *
3090  * Returns 1 for connected otherwise 0.
3091  */
3092 int snd_soc_dapm_get_pin_status(struct snd_soc_dapm_context *dapm,
3093                                 const char *pin)
3094 {
3095         struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
3096 
3097         if (w)
3098                 return w->connected;
3099 
3100         return 0;
3101 }
3102 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_status);
3103 
3104 /**
3105  * snd_soc_dapm_ignore_suspend - ignore suspend status for DAPM endpoint
3106  * @dapm: DAPM context
3107  * @pin: audio signal pin endpoint (or start point)
3108  *
3109  * Mark the given endpoint or pin as ignoring suspend.  When the
3110  * system is disabled a path between two endpoints flagged as ignoring
3111  * suspend will not be disabled.  The path must already be enabled via
3112  * normal means at suspend time, it will not be turned on if it was not
3113  * already enabled.
3114  */
3115 int snd_soc_dapm_ignore_suspend(struct snd_soc_dapm_context *dapm,
3116                                 const char *pin)
3117 {
3118         struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, false);
3119 
3120         if (!w) {
3121                 dev_err(dapm->dev, "dapm: unknown pin %s\n", pin);
3122                 return -EINVAL;
3123         }
3124 
3125         w->ignore_suspend = 1;
3126 
3127         return 0;
3128 }
3129 EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);
3130 
3131 static bool snd_soc_dapm_widget_in_card_paths(struct snd_soc_card *card,
3132                                               struct snd_soc_dapm_widget *w)
3133 {
3134         struct snd_soc_dapm_path *p;
3135 
3136         list_for_each_entry(p, &card->paths, list) {
3137                 if ((p->source == w) || (p->sink == w)) {
3138                         dev_dbg(card->dev,
3139                             "... Path %s(id:%d dapm:%p) - %s(id:%d dapm:%p)\n",
3140                             p->source->name, p->source->id, p->source->dapm,
3141                             p->sink->name, p->sink->id, p->sink->dapm);
3142 
3143                         /* Connected to something other than the codec */
3144                         if (p->source->dapm != p->sink->dapm)
3145                                 return true;
3146                         /*
3147                          * Loopback connection from codec external pin to
3148                          * codec external pin
3149                          */
3150                         if (p->sink->id == snd_soc_dapm_input) {
3151                                 switch (p->source->id) {
3152                                 case snd_soc_dapm_output:
3153                                 case snd_soc_dapm_micbias:
3154                                         return true;
3155                                 default:
3156                                         break;
3157                                 }
3158                         }
3159                 }
3160         }
3161 
3162         return false;
3163 }
3164 
3165 /**
3166  * snd_soc_dapm_auto_nc_codec_pins - call snd_soc_dapm_nc_pin for unused pins
3167  * @codec: The codec whose pins should be processed
3168  *
3169  * Automatically call snd_soc_dapm_nc_pin() for any external pins in the codec
3170  * which are unused. Pins are used if they are connected externally to the
3171  * codec, whether that be to some other device, or a loop-back connection to
3172  * the codec itself.
3173  */
3174 void snd_soc_dapm_auto_nc_codec_pins(struct snd_soc_codec *codec)
3175 {
3176         struct snd_soc_card *card = codec->card;
3177         struct snd_soc_dapm_context *dapm = &codec->dapm;
3178         struct snd_soc_dapm_widget *w;
3179 
3180         dev_dbg(codec->dev, "Auto NC: DAPMs: card:%p codec:%p\n",
3181                 &card->dapm, &codec->dapm);
3182 
3183         list_for_each_entry(w, &card->widgets, list) {
3184                 if (w->dapm != dapm)
3185                         continue;
3186                 switch (w->id) {
3187                 case snd_soc_dapm_input:
3188                 case snd_soc_dapm_output:
3189                 case snd_soc_dapm_micbias:
3190                         dev_dbg(codec->dev, "Auto NC: Checking widget %s\n",
3191                                 w->name);
3192                         if (!snd_soc_dapm_widget_in_card_paths(card, w)) {
3193                                 dev_dbg(codec->dev,
3194                                         "... Not in map; disabling\n");
3195                                 snd_soc_dapm_nc_pin(dapm, w->name);
3196                         }
3197                         break;
3198                 default:
3199                         break;
3200                 }
3201         }
3202 }
3203 
3204 /**
3205  * snd_soc_dapm_free - free dapm resources
3206  * @dapm: DAPM context
3207  *
3208  * Free all dapm widgets and resources.
3209  */
3210 void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
3211 {
3212         snd_soc_dapm_sys_remove(dapm->dev);
3213         dapm_debugfs_cleanup(dapm);
3214         dapm_free_widgets(dapm);
3215         list_del(&dapm->list);
3216 }
3217 EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
3218 
3219 static void soc_dapm_shutdown_codec(struct snd_soc_dapm_context *dapm)
3220 {
3221         struct snd_soc_dapm_widget *w;
3222         LIST_HEAD(down_list);
3223         int powerdown = 0;
3224 
3225         list_for_each_entry(w, &dapm->card->widgets, list) {
3226                 if (w->dapm != dapm)
3227                         continue;
3228                 if (w->power) {
3229                         dapm_seq_insert(w, &down_list, false);
3230                         w->power = 0;
3231                         powerdown = 1;
3232                 }
3233         }
3234 
3235         /* If there were no widgets to power down we're already in
3236          * standby.
3237          */
3238         if (powerdown) {
3239                 if (dapm->bias_level == SND_SOC_BIAS_ON)
3240                         snd_soc_dapm_set_bias_level(dapm,
3241                                                     SND_SOC_BIAS_PREPARE);
3242                 dapm_seq_run(dapm, &down_list, 0, false);
3243                 if (dapm->bias_level == SND_SOC_BIAS_PREPARE)
3244                         snd_soc_dapm_set_bias_level(dapm,
3245                                                     SND_SOC_BIAS_STANDBY);
3246         }
3247 }
3248 
3249 /*
3250  * snd_soc_dapm_shutdown - callback for system shutdown
3251  */
3252 void snd_soc_dapm_shutdown(struct snd_soc_card *card)
3253 {
3254         struct snd_soc_codec *codec;
3255 
3256         list_for_each_entry(codec, &card->codec_dev_list, card_list) {
3257                 soc_dapm_shutdown_codec(&codec->dapm);
3258                 if (codec->dapm.bias_level == SND_SOC_BIAS_STANDBY)
3259                         snd_soc_dapm_set_bias_level(&codec->dapm,
3260                                                     SND_SOC_BIAS_OFF);
3261         }
3262 }
3263 
3264 /* Module information */
3265 MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
3266 MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
3267 MODULE_LICENSE("GPL");
3268 

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