1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos.h>
28 #include <linux/aio.h>
29 #include <linux/dma-mapping.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <asm/io.h>
38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39 #include <dma-coherence.h>
40 #endif
41
42 /*
43 * Compatibility
44 */
45
46 struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60 };
61
62 #ifdef CONFIG_SND_SUPPORT_OLD_API
63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70 #endif
71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73 /*
74 *
75 */
76
77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82 static inline mm_segment_t snd_enter_user(void)
83 {
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87 }
88
89 static inline void snd_leave_user(mm_segment_t fs)
90 {
91 set_fs(fs);
92 }
93
94
95
96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97 {
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121 }
122
123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125 {
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139 }
140
141 #undef RULES_DEBUG
142
143 #ifdef RULES_DEBUG
144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145 static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161 };
162 #endif
163
164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192 #ifdef RULES_DEBUG
193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197 #ifdef RULES_DEBUG
198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199 #endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212 #ifdef RULES_DEBUG
213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 printk("empty");
216 else
217 printk("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 printk(" -> ");
221 #endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223 #ifdef RULES_DEBUG
224 if (i->empty)
225 printk("empty\n");
226 else
227 printk("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230 #endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257 #ifdef RULES_DEBUG
258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 printk("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 printk("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 printk("empty");
268 else
269 printk("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274 #endif
275 changed = r->func(params, r);
276 #ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 printk(" -> ");
279 if (hw_is_mask(r->var))
280 printk("%x", *m->bits);
281 else {
282 if (i->empty)
283 printk("empty");
284 else
285 printk("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 printk("\n");
291 #endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333 }
334
335 EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339 {
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355 }
356
357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
358 {
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370 }
371
372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
373 {
374 snd_pcm_stream_lock_irq(substream);
375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
376 substream->runtime->status->state = state;
377 snd_pcm_stream_unlock_irq(substream);
378 }
379
380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *params)
382 {
383 struct snd_pcm_runtime *runtime;
384 int err, usecs;
385 unsigned int bits;
386 snd_pcm_uframes_t frames;
387
388 if (PCM_RUNTIME_CHECK(substream))
389 return -ENXIO;
390 runtime = substream->runtime;
391 snd_pcm_stream_lock_irq(substream);
392 switch (runtime->status->state) {
393 case SNDRV_PCM_STATE_OPEN:
394 case SNDRV_PCM_STATE_SETUP:
395 case SNDRV_PCM_STATE_PREPARED:
396 break;
397 default:
398 snd_pcm_stream_unlock_irq(substream);
399 return -EBADFD;
400 }
401 snd_pcm_stream_unlock_irq(substream);
402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
403 if (!substream->oss.oss)
404 #endif
405 if (atomic_read(&substream->mmap_count))
406 return -EBADFD;
407
408 params->rmask = ~0U;
409 err = snd_pcm_hw_refine(substream, params);
410 if (err < 0)
411 goto _error;
412
413 err = snd_pcm_hw_params_choose(substream, params);
414 if (err < 0)
415 goto _error;
416
417 if (substream->ops->hw_params != NULL) {
418 err = substream->ops->hw_params(substream, params);
419 if (err < 0)
420 goto _error;
421 }
422
423 runtime->access = params_access(params);
424 runtime->format = params_format(params);
425 runtime->subformat = params_subformat(params);
426 runtime->channels = params_channels(params);
427 runtime->rate = params_rate(params);
428 runtime->period_size = params_period_size(params);
429 runtime->periods = params_periods(params);
430 runtime->buffer_size = params_buffer_size(params);
431 runtime->info = params->info;
432 runtime->rate_num = params->rate_num;
433 runtime->rate_den = params->rate_den;
434 runtime->no_period_wakeup =
435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
437
438 bits = snd_pcm_format_physical_width(runtime->format);
439 runtime->sample_bits = bits;
440 bits *= runtime->channels;
441 runtime->frame_bits = bits;
442 frames = 1;
443 while (bits % 8 != 0) {
444 bits *= 2;
445 frames *= 2;
446 }
447 runtime->byte_align = bits / 8;
448 runtime->min_align = frames;
449
450 /* Default sw params */
451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
452 runtime->period_step = 1;
453 runtime->control->avail_min = runtime->period_size;
454 runtime->start_threshold = 1;
455 runtime->stop_threshold = runtime->buffer_size;
456 runtime->silence_threshold = 0;
457 runtime->silence_size = 0;
458 runtime->boundary = runtime->buffer_size;
459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
460 runtime->boundary *= 2;
461
462 snd_pcm_timer_resolution_change(substream);
463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
464
465 if (pm_qos_request_active(&substream->latency_pm_qos_req))
466 pm_qos_remove_request(&substream->latency_pm_qos_req);
467 if ((usecs = period_to_usecs(runtime)) >= 0)
468 pm_qos_add_request(&substream->latency_pm_qos_req,
469 PM_QOS_CPU_DMA_LATENCY, usecs);
470 return 0;
471 _error:
472 /* hardware might be unusable from this time,
473 so we force application to retry to set
474 the correct hardware parameter settings */
475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
476 if (substream->ops->hw_free != NULL)
477 substream->ops->hw_free(substream);
478 return err;
479 }
480
481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params __user * _params)
483 {
484 struct snd_pcm_hw_params *params;
485 int err;
486
487 params = memdup_user(_params, sizeof(*params));
488 if (IS_ERR(params))
489 return PTR_ERR(params);
490
491 err = snd_pcm_hw_params(substream, params);
492 if (copy_to_user(_params, params, sizeof(*params))) {
493 if (!err)
494 err = -EFAULT;
495 }
496
497 kfree(params);
498 return err;
499 }
500
501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
502 {
503 struct snd_pcm_runtime *runtime;
504 int result = 0;
505
506 if (PCM_RUNTIME_CHECK(substream))
507 return -ENXIO;
508 runtime = substream->runtime;
509 snd_pcm_stream_lock_irq(substream);
510 switch (runtime->status->state) {
511 case SNDRV_PCM_STATE_SETUP:
512 case SNDRV_PCM_STATE_PREPARED:
513 break;
514 default:
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519 if (atomic_read(&substream->mmap_count))
520 return -EBADFD;
521 if (substream->ops->hw_free)
522 result = substream->ops->hw_free(substream);
523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
524 pm_qos_remove_request(&substream->latency_pm_qos_req);
525 return result;
526 }
527
528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
529 struct snd_pcm_sw_params *params)
530 {
531 struct snd_pcm_runtime *runtime;
532 int err;
533
534 if (PCM_RUNTIME_CHECK(substream))
535 return -ENXIO;
536 runtime = substream->runtime;
537 snd_pcm_stream_lock_irq(substream);
538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
539 snd_pcm_stream_unlock_irq(substream);
540 return -EBADFD;
541 }
542 snd_pcm_stream_unlock_irq(substream);
543
544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
545 return -EINVAL;
546 if (params->avail_min == 0)
547 return -EINVAL;
548 if (params->silence_size >= runtime->boundary) {
549 if (params->silence_threshold != 0)
550 return -EINVAL;
551 } else {
552 if (params->silence_size > params->silence_threshold)
553 return -EINVAL;
554 if (params->silence_threshold > runtime->buffer_size)
555 return -EINVAL;
556 }
557 err = 0;
558 snd_pcm_stream_lock_irq(substream);
559 runtime->tstamp_mode = params->tstamp_mode;
560 runtime->period_step = params->period_step;
561 runtime->control->avail_min = params->avail_min;
562 runtime->start_threshold = params->start_threshold;
563 runtime->stop_threshold = params->stop_threshold;
564 runtime->silence_threshold = params->silence_threshold;
565 runtime->silence_size = params->silence_size;
566 params->boundary = runtime->boundary;
567 if (snd_pcm_running(substream)) {
568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
569 runtime->silence_size > 0)
570 snd_pcm_playback_silence(substream, ULONG_MAX);
571 err = snd_pcm_update_state(substream, runtime);
572 }
573 snd_pcm_stream_unlock_irq(substream);
574 return err;
575 }
576
577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_sw_params __user * _params)
579 {
580 struct snd_pcm_sw_params params;
581 int err;
582 if (copy_from_user(¶ms, _params, sizeof(params)))
583 return -EFAULT;
584 err = snd_pcm_sw_params(substream, ¶ms);
585 if (copy_to_user(_params, ¶ms, sizeof(params)))
586 return -EFAULT;
587 return err;
588 }
589
590 int snd_pcm_status(struct snd_pcm_substream *substream,
591 struct snd_pcm_status *status)
592 {
593 struct snd_pcm_runtime *runtime = substream->runtime;
594
595 snd_pcm_stream_lock_irq(substream);
596 status->state = runtime->status->state;
597 status->suspended_state = runtime->status->suspended_state;
598 if (status->state == SNDRV_PCM_STATE_OPEN)
599 goto _end;
600 status->trigger_tstamp = runtime->trigger_tstamp;
601 if (snd_pcm_running(substream)) {
602 snd_pcm_update_hw_ptr(substream);
603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
604 status->tstamp = runtime->status->tstamp;
605 status->audio_tstamp =
606 runtime->status->audio_tstamp;
607 goto _tstamp_end;
608 }
609 }
610 snd_pcm_gettime(runtime, &status->tstamp);
611 _tstamp_end:
612 status->appl_ptr = runtime->control->appl_ptr;
613 status->hw_ptr = runtime->status->hw_ptr;
614 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
615 status->avail = snd_pcm_playback_avail(runtime);
616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
617 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
618 status->delay = runtime->buffer_size - status->avail;
619 status->delay += runtime->delay;
620 } else
621 status->delay = 0;
622 } else {
623 status->avail = snd_pcm_capture_avail(runtime);
624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
625 status->delay = status->avail + runtime->delay;
626 else
627 status->delay = 0;
628 }
629 status->avail_max = runtime->avail_max;
630 status->overrange = runtime->overrange;
631 runtime->avail_max = 0;
632 runtime->overrange = 0;
633 _end:
634 snd_pcm_stream_unlock_irq(substream);
635 return 0;
636 }
637
638 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
639 struct snd_pcm_status __user * _status)
640 {
641 struct snd_pcm_status status;
642 int res;
643
644 memset(&status, 0, sizeof(status));
645 res = snd_pcm_status(substream, &status);
646 if (res < 0)
647 return res;
648 if (copy_to_user(_status, &status, sizeof(status)))
649 return -EFAULT;
650 return 0;
651 }
652
653 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
654 struct snd_pcm_channel_info * info)
655 {
656 struct snd_pcm_runtime *runtime;
657 unsigned int channel;
658
659 channel = info->channel;
660 runtime = substream->runtime;
661 snd_pcm_stream_lock_irq(substream);
662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
663 snd_pcm_stream_unlock_irq(substream);
664 return -EBADFD;
665 }
666 snd_pcm_stream_unlock_irq(substream);
667 if (channel >= runtime->channels)
668 return -EINVAL;
669 memset(info, 0, sizeof(*info));
670 info->channel = channel;
671 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
672 }
673
674 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
675 struct snd_pcm_channel_info __user * _info)
676 {
677 struct snd_pcm_channel_info info;
678 int res;
679
680 if (copy_from_user(&info, _info, sizeof(info)))
681 return -EFAULT;
682 res = snd_pcm_channel_info(substream, &info);
683 if (res < 0)
684 return res;
685 if (copy_to_user(_info, &info, sizeof(info)))
686 return -EFAULT;
687 return 0;
688 }
689
690 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
691 {
692 struct snd_pcm_runtime *runtime = substream->runtime;
693 if (runtime->trigger_master == NULL)
694 return;
695 if (runtime->trigger_master == substream) {
696 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
697 } else {
698 snd_pcm_trigger_tstamp(runtime->trigger_master);
699 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
700 }
701 runtime->trigger_master = NULL;
702 }
703
704 struct action_ops {
705 int (*pre_action)(struct snd_pcm_substream *substream, int state);
706 int (*do_action)(struct snd_pcm_substream *substream, int state);
707 void (*undo_action)(struct snd_pcm_substream *substream, int state);
708 void (*post_action)(struct snd_pcm_substream *substream, int state);
709 };
710
711 /*
712 * this functions is core for handling of linked stream
713 * Note: the stream state might be changed also on failure
714 * Note2: call with calling stream lock + link lock
715 */
716 static int snd_pcm_action_group(struct action_ops *ops,
717 struct snd_pcm_substream *substream,
718 int state, int do_lock)
719 {
720 struct snd_pcm_substream *s = NULL;
721 struct snd_pcm_substream *s1;
722 int res = 0;
723
724 snd_pcm_group_for_each_entry(s, substream) {
725 if (do_lock && s != substream)
726 spin_lock_nested(&s->self_group.lock,
727 SINGLE_DEPTH_NESTING);
728 res = ops->pre_action(s, state);
729 if (res < 0)
730 goto _unlock;
731 }
732 snd_pcm_group_for_each_entry(s, substream) {
733 res = ops->do_action(s, state);
734 if (res < 0) {
735 if (ops->undo_action) {
736 snd_pcm_group_for_each_entry(s1, substream) {
737 if (s1 == s) /* failed stream */
738 break;
739 ops->undo_action(s1, state);
740 }
741 }
742 s = NULL; /* unlock all */
743 goto _unlock;
744 }
745 }
746 snd_pcm_group_for_each_entry(s, substream) {
747 ops->post_action(s, state);
748 }
749 _unlock:
750 if (do_lock) {
751 /* unlock streams */
752 snd_pcm_group_for_each_entry(s1, substream) {
753 if (s1 != substream)
754 spin_unlock(&s1->self_group.lock);
755 if (s1 == s) /* end */
756 break;
757 }
758 }
759 return res;
760 }
761
762 /*
763 * Note: call with stream lock
764 */
765 static int snd_pcm_action_single(struct action_ops *ops,
766 struct snd_pcm_substream *substream,
767 int state)
768 {
769 int res;
770
771 res = ops->pre_action(substream, state);
772 if (res < 0)
773 return res;
774 res = ops->do_action(substream, state);
775 if (res == 0)
776 ops->post_action(substream, state);
777 else if (ops->undo_action)
778 ops->undo_action(substream, state);
779 return res;
780 }
781
782 /*
783 * Note: call with stream lock
784 */
785 static int snd_pcm_action(struct action_ops *ops,
786 struct snd_pcm_substream *substream,
787 int state)
788 {
789 int res;
790
791 if (snd_pcm_stream_linked(substream)) {
792 if (!spin_trylock(&substream->group->lock)) {
793 spin_unlock(&substream->self_group.lock);
794 spin_lock(&substream->group->lock);
795 spin_lock(&substream->self_group.lock);
796 }
797 res = snd_pcm_action_group(ops, substream, state, 1);
798 spin_unlock(&substream->group->lock);
799 } else {
800 res = snd_pcm_action_single(ops, substream, state);
801 }
802 return res;
803 }
804
805 /*
806 * Note: don't use any locks before
807 */
808 static int snd_pcm_action_lock_irq(struct action_ops *ops,
809 struct snd_pcm_substream *substream,
810 int state)
811 {
812 int res;
813
814 read_lock_irq(&snd_pcm_link_rwlock);
815 if (snd_pcm_stream_linked(substream)) {
816 spin_lock(&substream->group->lock);
817 spin_lock(&substream->self_group.lock);
818 res = snd_pcm_action_group(ops, substream, state, 1);
819 spin_unlock(&substream->self_group.lock);
820 spin_unlock(&substream->group->lock);
821 } else {
822 spin_lock(&substream->self_group.lock);
823 res = snd_pcm_action_single(ops, substream, state);
824 spin_unlock(&substream->self_group.lock);
825 }
826 read_unlock_irq(&snd_pcm_link_rwlock);
827 return res;
828 }
829
830 /*
831 */
832 static int snd_pcm_action_nonatomic(struct action_ops *ops,
833 struct snd_pcm_substream *substream,
834 int state)
835 {
836 int res;
837
838 down_read(&snd_pcm_link_rwsem);
839 if (snd_pcm_stream_linked(substream))
840 res = snd_pcm_action_group(ops, substream, state, 0);
841 else
842 res = snd_pcm_action_single(ops, substream, state);
843 up_read(&snd_pcm_link_rwsem);
844 return res;
845 }
846
847 /*
848 * start callbacks
849 */
850 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
851 {
852 struct snd_pcm_runtime *runtime = substream->runtime;
853 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
854 return -EBADFD;
855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
856 !snd_pcm_playback_data(substream))
857 return -EPIPE;
858 runtime->trigger_master = substream;
859 return 0;
860 }
861
862 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
863 {
864 if (substream->runtime->trigger_master != substream)
865 return 0;
866 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
867 }
868
869 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
870 {
871 if (substream->runtime->trigger_master == substream)
872 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
873 }
874
875 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
876 {
877 struct snd_pcm_runtime *runtime = substream->runtime;
878 snd_pcm_trigger_tstamp(substream);
879 runtime->hw_ptr_jiffies = jiffies;
880 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
881 runtime->rate;
882 runtime->status->state = state;
883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
884 runtime->silence_size > 0)
885 snd_pcm_playback_silence(substream, ULONG_MAX);
886 if (substream->timer)
887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
888 &runtime->trigger_tstamp);
889 }
890
891 static struct action_ops snd_pcm_action_start = {
892 .pre_action = snd_pcm_pre_start,
893 .do_action = snd_pcm_do_start,
894 .undo_action = snd_pcm_undo_start,
895 .post_action = snd_pcm_post_start
896 };
897
898 /**
899 * snd_pcm_start - start all linked streams
900 * @substream: the PCM substream instance
901 *
902 * Return: Zero if successful, or a negative error code.
903 */
904 int snd_pcm_start(struct snd_pcm_substream *substream)
905 {
906 return snd_pcm_action(&snd_pcm_action_start, substream,
907 SNDRV_PCM_STATE_RUNNING);
908 }
909
910 /*
911 * stop callbacks
912 */
913 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
914 {
915 struct snd_pcm_runtime *runtime = substream->runtime;
916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
917 return -EBADFD;
918 runtime->trigger_master = substream;
919 return 0;
920 }
921
922 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
923 {
924 if (substream->runtime->trigger_master == substream &&
925 snd_pcm_running(substream))
926 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
927 return 0; /* unconditonally stop all substreams */
928 }
929
930 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
931 {
932 struct snd_pcm_runtime *runtime = substream->runtime;
933 if (runtime->status->state != state) {
934 snd_pcm_trigger_tstamp(substream);
935 if (substream->timer)
936 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
937 &runtime->trigger_tstamp);
938 runtime->status->state = state;
939 }
940 wake_up(&runtime->sleep);
941 wake_up(&runtime->tsleep);
942 }
943
944 static struct action_ops snd_pcm_action_stop = {
945 .pre_action = snd_pcm_pre_stop,
946 .do_action = snd_pcm_do_stop,
947 .post_action = snd_pcm_post_stop
948 };
949
950 /**
951 * snd_pcm_stop - try to stop all running streams in the substream group
952 * @substream: the PCM substream instance
953 * @state: PCM state after stopping the stream
954 *
955 * The state of each stream is then changed to the given state unconditionally.
956 *
957 * Return: Zero if succesful, or a negative error code.
958 */
959 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
960 {
961 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
962 }
963
964 EXPORT_SYMBOL(snd_pcm_stop);
965
966 /**
967 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
968 * @substream: the PCM substream
969 *
970 * After stopping, the state is changed to SETUP.
971 * Unlike snd_pcm_stop(), this affects only the given stream.
972 *
973 * Return: Zero if succesful, or a negative error code.
974 */
975 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
976 {
977 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
978 SNDRV_PCM_STATE_SETUP);
979 }
980
981 /*
982 * pause callbacks
983 */
984 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
985 {
986 struct snd_pcm_runtime *runtime = substream->runtime;
987 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
988 return -ENOSYS;
989 if (push) {
990 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
991 return -EBADFD;
992 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
993 return -EBADFD;
994 runtime->trigger_master = substream;
995 return 0;
996 }
997
998 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
999 {
1000 if (substream->runtime->trigger_master != substream)
1001 return 0;
1002 /* some drivers might use hw_ptr to recover from the pause -
1003 update the hw_ptr now */
1004 if (push)
1005 snd_pcm_update_hw_ptr(substream);
1006 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1007 * a delta between the current jiffies, this gives a large enough
1008 * delta, effectively to skip the check once.
1009 */
1010 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1011 return substream->ops->trigger(substream,
1012 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1013 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1014 }
1015
1016 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1017 {
1018 if (substream->runtime->trigger_master == substream)
1019 substream->ops->trigger(substream,
1020 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1021 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1022 }
1023
1024 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1025 {
1026 struct snd_pcm_runtime *runtime = substream->runtime;
1027 snd_pcm_trigger_tstamp(substream);
1028 if (push) {
1029 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1030 if (substream->timer)
1031 snd_timer_notify(substream->timer,
1032 SNDRV_TIMER_EVENT_MPAUSE,
1033 &runtime->trigger_tstamp);
1034 wake_up(&runtime->sleep);
1035 wake_up(&runtime->tsleep);
1036 } else {
1037 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1038 if (substream->timer)
1039 snd_timer_notify(substream->timer,
1040 SNDRV_TIMER_EVENT_MCONTINUE,
1041 &runtime->trigger_tstamp);
1042 }
1043 }
1044
1045 static struct action_ops snd_pcm_action_pause = {
1046 .pre_action = snd_pcm_pre_pause,
1047 .do_action = snd_pcm_do_pause,
1048 .undo_action = snd_pcm_undo_pause,
1049 .post_action = snd_pcm_post_pause
1050 };
1051
1052 /*
1053 * Push/release the pause for all linked streams.
1054 */
1055 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1056 {
1057 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1058 }
1059
1060 #ifdef CONFIG_PM
1061 /* suspend */
1062
1063 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1064 {
1065 struct snd_pcm_runtime *runtime = substream->runtime;
1066 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1067 return -EBUSY;
1068 runtime->trigger_master = substream;
1069 return 0;
1070 }
1071
1072 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1073 {
1074 struct snd_pcm_runtime *runtime = substream->runtime;
1075 if (runtime->trigger_master != substream)
1076 return 0;
1077 if (! snd_pcm_running(substream))
1078 return 0;
1079 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1080 return 0; /* suspend unconditionally */
1081 }
1082
1083 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1084 {
1085 struct snd_pcm_runtime *runtime = substream->runtime;
1086 snd_pcm_trigger_tstamp(substream);
1087 if (substream->timer)
1088 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1089 &runtime->trigger_tstamp);
1090 runtime->status->suspended_state = runtime->status->state;
1091 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1092 wake_up(&runtime->sleep);
1093 wake_up(&runtime->tsleep);
1094 }
1095
1096 static struct action_ops snd_pcm_action_suspend = {
1097 .pre_action = snd_pcm_pre_suspend,
1098 .do_action = snd_pcm_do_suspend,
1099 .post_action = snd_pcm_post_suspend
1100 };
1101
1102 /**
1103 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1104 * @substream: the PCM substream
1105 *
1106 * After this call, all streams are changed to SUSPENDED state.
1107 *
1108 * Return: Zero if successful (or @substream is %NULL), or a negative error
1109 * code.
1110 */
1111 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1112 {
1113 int err;
1114 unsigned long flags;
1115
1116 if (! substream)
1117 return 0;
1118
1119 snd_pcm_stream_lock_irqsave(substream, flags);
1120 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1121 snd_pcm_stream_unlock_irqrestore(substream, flags);
1122 return err;
1123 }
1124
1125 EXPORT_SYMBOL(snd_pcm_suspend);
1126
1127 /**
1128 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1129 * @pcm: the PCM instance
1130 *
1131 * After this call, all streams are changed to SUSPENDED state.
1132 *
1133 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1134 */
1135 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1136 {
1137 struct snd_pcm_substream *substream;
1138 int stream, err = 0;
1139
1140 if (! pcm)
1141 return 0;
1142
1143 for (stream = 0; stream < 2; stream++) {
1144 for (substream = pcm->streams[stream].substream;
1145 substream; substream = substream->next) {
1146 /* FIXME: the open/close code should lock this as well */
1147 if (substream->runtime == NULL)
1148 continue;
1149 err = snd_pcm_suspend(substream);
1150 if (err < 0 && err != -EBUSY)
1151 return err;
1152 }
1153 }
1154 return 0;
1155 }
1156
1157 EXPORT_SYMBOL(snd_pcm_suspend_all);
1158
1159 /* resume */
1160
1161 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1162 {
1163 struct snd_pcm_runtime *runtime = substream->runtime;
1164 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1165 return -ENOSYS;
1166 runtime->trigger_master = substream;
1167 return 0;
1168 }
1169
1170 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1171 {
1172 struct snd_pcm_runtime *runtime = substream->runtime;
1173 if (runtime->trigger_master != substream)
1174 return 0;
1175 /* DMA not running previously? */
1176 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1177 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1178 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1179 return 0;
1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1181 }
1182
1183 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1184 {
1185 if (substream->runtime->trigger_master == substream &&
1186 snd_pcm_running(substream))
1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1188 }
1189
1190 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1191 {
1192 struct snd_pcm_runtime *runtime = substream->runtime;
1193 snd_pcm_trigger_tstamp(substream);
1194 if (substream->timer)
1195 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1196 &runtime->trigger_tstamp);
1197 runtime->status->state = runtime->status->suspended_state;
1198 }
1199
1200 static struct action_ops snd_pcm_action_resume = {
1201 .pre_action = snd_pcm_pre_resume,
1202 .do_action = snd_pcm_do_resume,
1203 .undo_action = snd_pcm_undo_resume,
1204 .post_action = snd_pcm_post_resume
1205 };
1206
1207 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1208 {
1209 struct snd_card *card = substream->pcm->card;
1210 int res;
1211
1212 snd_power_lock(card);
1213 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1214 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1215 snd_power_unlock(card);
1216 return res;
1217 }
1218
1219 #else
1220
1221 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1222 {
1223 return -ENOSYS;
1224 }
1225
1226 #endif /* CONFIG_PM */
1227
1228 /*
1229 * xrun ioctl
1230 *
1231 * Change the RUNNING stream(s) to XRUN state.
1232 */
1233 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1234 {
1235 struct snd_card *card = substream->pcm->card;
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 int result;
1238
1239 snd_power_lock(card);
1240 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1241 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1242 if (result < 0)
1243 goto _unlock;
1244 }
1245
1246 snd_pcm_stream_lock_irq(substream);
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_XRUN:
1249 result = 0; /* already there */
1250 break;
1251 case SNDRV_PCM_STATE_RUNNING:
1252 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1253 break;
1254 default:
1255 result = -EBADFD;
1256 }
1257 snd_pcm_stream_unlock_irq(substream);
1258 _unlock:
1259 snd_power_unlock(card);
1260 return result;
1261 }
1262
1263 /*
1264 * reset ioctl
1265 */
1266 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1267 {
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 switch (runtime->status->state) {
1270 case SNDRV_PCM_STATE_RUNNING:
1271 case SNDRV_PCM_STATE_PREPARED:
1272 case SNDRV_PCM_STATE_PAUSED:
1273 case SNDRV_PCM_STATE_SUSPENDED:
1274 return 0;
1275 default:
1276 return -EBADFD;
1277 }
1278 }
1279
1280 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1281 {
1282 struct snd_pcm_runtime *runtime = substream->runtime;
1283 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1284 if (err < 0)
1285 return err;
1286 runtime->hw_ptr_base = 0;
1287 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1288 runtime->status->hw_ptr % runtime->period_size;
1289 runtime->silence_start = runtime->status->hw_ptr;
1290 runtime->silence_filled = 0;
1291 return 0;
1292 }
1293
1294 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1295 {
1296 struct snd_pcm_runtime *runtime = substream->runtime;
1297 runtime->control->appl_ptr = runtime->status->hw_ptr;
1298 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1299 runtime->silence_size > 0)
1300 snd_pcm_playback_silence(substream, ULONG_MAX);
1301 }
1302
1303 static struct action_ops snd_pcm_action_reset = {
1304 .pre_action = snd_pcm_pre_reset,
1305 .do_action = snd_pcm_do_reset,
1306 .post_action = snd_pcm_post_reset
1307 };
1308
1309 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1310 {
1311 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1312 }
1313
1314 /*
1315 * prepare ioctl
1316 */
1317 /* we use the second argument for updating f_flags */
1318 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1319 int f_flags)
1320 {
1321 struct snd_pcm_runtime *runtime = substream->runtime;
1322 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1323 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1324 return -EBADFD;
1325 if (snd_pcm_running(substream))
1326 return -EBUSY;
1327 substream->f_flags = f_flags;
1328 return 0;
1329 }
1330
1331 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1332 {
1333 int err;
1334 err = substream->ops->prepare(substream);
1335 if (err < 0)
1336 return err;
1337 return snd_pcm_do_reset(substream, 0);
1338 }
1339
1340 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1341 {
1342 struct snd_pcm_runtime *runtime = substream->runtime;
1343 runtime->control->appl_ptr = runtime->status->hw_ptr;
1344 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1345 }
1346
1347 static struct action_ops snd_pcm_action_prepare = {
1348 .pre_action = snd_pcm_pre_prepare,
1349 .do_action = snd_pcm_do_prepare,
1350 .post_action = snd_pcm_post_prepare
1351 };
1352
1353 /**
1354 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1355 * @substream: the PCM substream instance
1356 * @file: file to refer f_flags
1357 *
1358 * Return: Zero if successful, or a negative error code.
1359 */
1360 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1361 struct file *file)
1362 {
1363 int res;
1364 struct snd_card *card = substream->pcm->card;
1365 int f_flags;
1366
1367 if (file)
1368 f_flags = file->f_flags;
1369 else
1370 f_flags = substream->f_flags;
1371
1372 snd_power_lock(card);
1373 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1374 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1375 substream, f_flags);
1376 snd_power_unlock(card);
1377 return res;
1378 }
1379
1380 /*
1381 * drain ioctl
1382 */
1383
1384 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1385 {
1386 struct snd_pcm_runtime *runtime = substream->runtime;
1387 switch (runtime->status->state) {
1388 case SNDRV_PCM_STATE_OPEN:
1389 case SNDRV_PCM_STATE_DISCONNECTED:
1390 case SNDRV_PCM_STATE_SUSPENDED:
1391 return -EBADFD;
1392 }
1393 runtime->trigger_master = substream;
1394 return 0;
1395 }
1396
1397 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1398 {
1399 struct snd_pcm_runtime *runtime = substream->runtime;
1400 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1401 switch (runtime->status->state) {
1402 case SNDRV_PCM_STATE_PREPARED:
1403 /* start playback stream if possible */
1404 if (! snd_pcm_playback_empty(substream)) {
1405 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1406 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1407 } else {
1408 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1409 }
1410 break;
1411 case SNDRV_PCM_STATE_RUNNING:
1412 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1413 break;
1414 case SNDRV_PCM_STATE_XRUN:
1415 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1416 break;
1417 default:
1418 break;
1419 }
1420 } else {
1421 /* stop running stream */
1422 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1423 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1424 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1425 snd_pcm_do_stop(substream, new_state);
1426 snd_pcm_post_stop(substream, new_state);
1427 }
1428 }
1429 return 0;
1430 }
1431
1432 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1433 {
1434 }
1435
1436 static struct action_ops snd_pcm_action_drain_init = {
1437 .pre_action = snd_pcm_pre_drain_init,
1438 .do_action = snd_pcm_do_drain_init,
1439 .post_action = snd_pcm_post_drain_init
1440 };
1441
1442 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1443
1444 /*
1445 * Drain the stream(s).
1446 * When the substream is linked, sync until the draining of all playback streams
1447 * is finished.
1448 * After this call, all streams are supposed to be either SETUP or DRAINING
1449 * (capture only) state.
1450 */
1451 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1452 struct file *file)
1453 {
1454 struct snd_card *card;
1455 struct snd_pcm_runtime *runtime;
1456 struct snd_pcm_substream *s;
1457 wait_queue_t wait;
1458 int result = 0;
1459 int nonblock = 0;
1460
1461 card = substream->pcm->card;
1462 runtime = substream->runtime;
1463
1464 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1465 return -EBADFD;
1466
1467 snd_power_lock(card);
1468 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1469 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1470 if (result < 0) {
1471 snd_power_unlock(card);
1472 return result;
1473 }
1474 }
1475
1476 if (file) {
1477 if (file->f_flags & O_NONBLOCK)
1478 nonblock = 1;
1479 } else if (substream->f_flags & O_NONBLOCK)
1480 nonblock = 1;
1481
1482 down_read(&snd_pcm_link_rwsem);
1483 snd_pcm_stream_lock_irq(substream);
1484 /* resume pause */
1485 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1486 snd_pcm_pause(substream, 0);
1487
1488 /* pre-start/stop - all running streams are changed to DRAINING state */
1489 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1490 if (result < 0)
1491 goto unlock;
1492 /* in non-blocking, we don't wait in ioctl but let caller poll */
1493 if (nonblock) {
1494 result = -EAGAIN;
1495 goto unlock;
1496 }
1497
1498 for (;;) {
1499 long tout;
1500 struct snd_pcm_runtime *to_check;
1501 if (signal_pending(current)) {
1502 result = -ERESTARTSYS;
1503 break;
1504 }
1505 /* find a substream to drain */
1506 to_check = NULL;
1507 snd_pcm_group_for_each_entry(s, substream) {
1508 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1509 continue;
1510 runtime = s->runtime;
1511 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1512 to_check = runtime;
1513 break;
1514 }
1515 }
1516 if (!to_check)
1517 break; /* all drained */
1518 init_waitqueue_entry(&wait, current);
1519 add_wait_queue(&to_check->sleep, &wait);
1520 snd_pcm_stream_unlock_irq(substream);
1521 up_read(&snd_pcm_link_rwsem);
1522 snd_power_unlock(card);
1523 if (runtime->no_period_wakeup)
1524 tout = MAX_SCHEDULE_TIMEOUT;
1525 else {
1526 tout = 10;
1527 if (runtime->rate) {
1528 long t = runtime->period_size * 2 / runtime->rate;
1529 tout = max(t, tout);
1530 }
1531 tout = msecs_to_jiffies(tout * 1000);
1532 }
1533 tout = schedule_timeout_interruptible(tout);
1534 snd_power_lock(card);
1535 down_read(&snd_pcm_link_rwsem);
1536 snd_pcm_stream_lock_irq(substream);
1537 remove_wait_queue(&to_check->sleep, &wait);
1538 if (card->shutdown) {
1539 result = -ENODEV;
1540 break;
1541 }
1542 if (tout == 0) {
1543 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1544 result = -ESTRPIPE;
1545 else {
1546 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1547 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1548 result = -EIO;
1549 }
1550 break;
1551 }
1552 }
1553
1554 unlock:
1555 snd_pcm_stream_unlock_irq(substream);
1556 up_read(&snd_pcm_link_rwsem);
1557 snd_power_unlock(card);
1558
1559 return result;
1560 }
1561
1562 /*
1563 * drop ioctl
1564 *
1565 * Immediately put all linked substreams into SETUP state.
1566 */
1567 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1568 {
1569 struct snd_pcm_runtime *runtime;
1570 int result = 0;
1571
1572 if (PCM_RUNTIME_CHECK(substream))
1573 return -ENXIO;
1574 runtime = substream->runtime;
1575
1576 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1577 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1578 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1579 return -EBADFD;
1580
1581 snd_pcm_stream_lock_irq(substream);
1582 /* resume pause */
1583 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1584 snd_pcm_pause(substream, 0);
1585
1586 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1587 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1588 snd_pcm_stream_unlock_irq(substream);
1589
1590 return result;
1591 }
1592
1593
1594 /* WARNING: Don't forget to fput back the file */
1595 static struct file *snd_pcm_file_fd(int fd, int *fput_needed)
1596 {
1597 struct file *file;
1598 struct inode *inode;
1599 unsigned int minor;
1600
1601 file = fget_light(fd, fput_needed);
1602 if (!file)
1603 return NULL;
1604 inode = file_inode(file);
1605 if (!S_ISCHR(inode->i_mode) ||
1606 imajor(inode) != snd_major) {
1607 fput_light(file, *fput_needed);
1608 return NULL;
1609 }
1610 minor = iminor(inode);
1611 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1612 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1613 fput_light(file, *fput_needed);
1614 return NULL;
1615 }
1616 return file;
1617 }
1618
1619 /*
1620 * PCM link handling
1621 */
1622 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1623 {
1624 int res = 0;
1625 struct file *file;
1626 struct snd_pcm_file *pcm_file;
1627 struct snd_pcm_substream *substream1;
1628 struct snd_pcm_group *group;
1629 int fput_needed;
1630
1631 file = snd_pcm_file_fd(fd, &fput_needed);
1632 if (!file)
1633 return -EBADFD;
1634 pcm_file = file->private_data;
1635 substream1 = pcm_file->substream;
1636 group = kmalloc(sizeof(*group), GFP_KERNEL);
1637 if (!group) {
1638 res = -ENOMEM;
1639 goto _nolock;
1640 }
1641 down_write(&snd_pcm_link_rwsem);
1642 write_lock_irq(&snd_pcm_link_rwlock);
1643 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1644 substream->runtime->status->state != substream1->runtime->status->state) {
1645 res = -EBADFD;
1646 goto _end;
1647 }
1648 if (snd_pcm_stream_linked(substream1)) {
1649 res = -EALREADY;
1650 goto _end;
1651 }
1652 if (!snd_pcm_stream_linked(substream)) {
1653 substream->group = group;
1654 group = NULL;
1655 spin_lock_init(&substream->group->lock);
1656 INIT_LIST_HEAD(&substream->group->substreams);
1657 list_add_tail(&substream->link_list, &substream->group->substreams);
1658 substream->group->count = 1;
1659 }
1660 list_add_tail(&substream1->link_list, &substream->group->substreams);
1661 substream->group->count++;
1662 substream1->group = substream->group;
1663 _end:
1664 write_unlock_irq(&snd_pcm_link_rwlock);
1665 up_write(&snd_pcm_link_rwsem);
1666 _nolock:
1667 snd_card_unref(substream1->pcm->card);
1668 fput_light(file, fput_needed);
1669 kfree(group);
1670 return res;
1671 }
1672
1673 static void relink_to_local(struct snd_pcm_substream *substream)
1674 {
1675 substream->group = &substream->self_group;
1676 INIT_LIST_HEAD(&substream->self_group.substreams);
1677 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1678 }
1679
1680 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1681 {
1682 struct snd_pcm_substream *s;
1683 int res = 0;
1684
1685 down_write(&snd_pcm_link_rwsem);
1686 write_lock_irq(&snd_pcm_link_rwlock);
1687 if (!snd_pcm_stream_linked(substream)) {
1688 res = -EALREADY;
1689 goto _end;
1690 }
1691 list_del(&substream->link_list);
1692 substream->group->count--;
1693 if (substream->group->count == 1) { /* detach the last stream, too */
1694 snd_pcm_group_for_each_entry(s, substream) {
1695 relink_to_local(s);
1696 break;
1697 }
1698 kfree(substream->group);
1699 }
1700 relink_to_local(substream);
1701 _end:
1702 write_unlock_irq(&snd_pcm_link_rwlock);
1703 up_write(&snd_pcm_link_rwsem);
1704 return res;
1705 }
1706
1707 /*
1708 * hw configurator
1709 */
1710 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1711 struct snd_pcm_hw_rule *rule)
1712 {
1713 struct snd_interval t;
1714 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1715 hw_param_interval_c(params, rule->deps[1]), &t);
1716 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1717 }
1718
1719 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1720 struct snd_pcm_hw_rule *rule)
1721 {
1722 struct snd_interval t;
1723 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1724 hw_param_interval_c(params, rule->deps[1]), &t);
1725 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1726 }
1727
1728 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1729 struct snd_pcm_hw_rule *rule)
1730 {
1731 struct snd_interval t;
1732 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1733 hw_param_interval_c(params, rule->deps[1]),
1734 (unsigned long) rule->private, &t);
1735 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1736 }
1737
1738 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1739 struct snd_pcm_hw_rule *rule)
1740 {
1741 struct snd_interval t;
1742 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1743 (unsigned long) rule->private,
1744 hw_param_interval_c(params, rule->deps[1]), &t);
1745 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1746 }
1747
1748 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1749 struct snd_pcm_hw_rule *rule)
1750 {
1751 unsigned int k;
1752 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1753 struct snd_mask m;
1754 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1755 snd_mask_any(&m);
1756 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1757 int bits;
1758 if (! snd_mask_test(mask, k))
1759 continue;
1760 bits = snd_pcm_format_physical_width(k);
1761 if (bits <= 0)
1762 continue; /* ignore invalid formats */
1763 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1764 snd_mask_reset(&m, k);
1765 }
1766 return snd_mask_refine(mask, &m);
1767 }
1768
1769 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1770 struct snd_pcm_hw_rule *rule)
1771 {
1772 struct snd_interval t;
1773 unsigned int k;
1774 t.min = UINT_MAX;
1775 t.max = 0;
1776 t.openmin = 0;
1777 t.openmax = 0;
1778 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1779 int bits;
1780 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1781 continue;
1782 bits = snd_pcm_format_physical_width(k);
1783 if (bits <= 0)
1784 continue; /* ignore invalid formats */
1785 if (t.min > (unsigned)bits)
1786 t.min = bits;
1787 if (t.max < (unsigned)bits)
1788 t.max = bits;
1789 }
1790 t.integer = 1;
1791 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1792 }
1793
1794 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1795 #error "Change this table"
1796 #endif
1797
1798 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1799 48000, 64000, 88200, 96000, 176400, 192000 };
1800
1801 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1802 .count = ARRAY_SIZE(rates),
1803 .list = rates,
1804 };
1805
1806 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1807 struct snd_pcm_hw_rule *rule)
1808 {
1809 struct snd_pcm_hardware *hw = rule->private;
1810 return snd_interval_list(hw_param_interval(params, rule->var),
1811 snd_pcm_known_rates.count,
1812 snd_pcm_known_rates.list, hw->rates);
1813 }
1814
1815 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1816 struct snd_pcm_hw_rule *rule)
1817 {
1818 struct snd_interval t;
1819 struct snd_pcm_substream *substream = rule->private;
1820 t.min = 0;
1821 t.max = substream->buffer_bytes_max;
1822 t.openmin = 0;
1823 t.openmax = 0;
1824 t.integer = 1;
1825 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1826 }
1827
1828 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1829 {
1830 struct snd_pcm_runtime *runtime = substream->runtime;
1831 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1832 int k, err;
1833
1834 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1835 snd_mask_any(constrs_mask(constrs, k));
1836 }
1837
1838 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1839 snd_interval_any(constrs_interval(constrs, k));
1840 }
1841
1842 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1843 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1844 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1845 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1846 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1847
1848 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1849 snd_pcm_hw_rule_format, NULL,
1850 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1851 if (err < 0)
1852 return err;
1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1854 snd_pcm_hw_rule_sample_bits, NULL,
1855 SNDRV_PCM_HW_PARAM_FORMAT,
1856 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1857 if (err < 0)
1858 return err;
1859 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1860 snd_pcm_hw_rule_div, NULL,
1861 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1862 if (err < 0)
1863 return err;
1864 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1865 snd_pcm_hw_rule_mul, NULL,
1866 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1867 if (err < 0)
1868 return err;
1869 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1870 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1871 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1872 if (err < 0)
1873 return err;
1874 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1875 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1876 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1877 if (err < 0)
1878 return err;
1879 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1880 snd_pcm_hw_rule_div, NULL,
1881 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1882 if (err < 0)
1883 return err;
1884 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1885 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1886 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1887 if (err < 0)
1888 return err;
1889 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1890 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1891 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1892 if (err < 0)
1893 return err;
1894 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1895 snd_pcm_hw_rule_div, NULL,
1896 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1897 if (err < 0)
1898 return err;
1899 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1900 snd_pcm_hw_rule_div, NULL,
1901 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1902 if (err < 0)
1903 return err;
1904 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1905 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1906 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1907 if (err < 0)
1908 return err;
1909 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1910 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1911 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1912 if (err < 0)
1913 return err;
1914 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1915 snd_pcm_hw_rule_mul, NULL,
1916 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1917 if (err < 0)
1918 return err;
1919 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1920 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1921 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1922 if (err < 0)
1923 return err;
1924 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1925 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1926 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1927 if (err < 0)
1928 return err;
1929 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1930 snd_pcm_hw_rule_muldivk, (void*) 8,
1931 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1932 if (err < 0)
1933 return err;
1934 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1935 snd_pcm_hw_rule_muldivk, (void*) 8,
1936 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1937 if (err < 0)
1938 return err;
1939 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1940 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1941 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1942 if (err < 0)
1943 return err;
1944 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1945 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1946 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1947 if (err < 0)
1948 return err;
1949 return 0;
1950 }
1951
1952 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1953 {
1954 struct snd_pcm_runtime *runtime = substream->runtime;
1955 struct snd_pcm_hardware *hw = &runtime->hw;
1956 int err;
1957 unsigned int mask = 0;
1958
1959 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1960 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1961 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1962 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1963 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1964 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1965 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1966 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1967 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1968 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1969 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1970 }
1971 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1972 if (err < 0)
1973 return err;
1974
1975 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1976 if (err < 0)
1977 return err;
1978
1979 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1980 if (err < 0)
1981 return err;
1982
1983 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1984 hw->channels_min, hw->channels_max);
1985 if (err < 0)
1986 return err;
1987
1988 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1989 hw->rate_min, hw->rate_max);
1990 if (err < 0)
1991 return err;
1992
1993 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1994 hw->period_bytes_min, hw->period_bytes_max);
1995 if (err < 0)
1996 return err;
1997
1998 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1999 hw->periods_min, hw->periods_max);
2000 if (err < 0)
2001 return err;
2002
2003 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2004 hw->period_bytes_min, hw->buffer_bytes_max);
2005 if (err < 0)
2006 return err;
2007
2008 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2009 snd_pcm_hw_rule_buffer_bytes_max, substream,
2010 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2011 if (err < 0)
2012 return err;
2013
2014 /* FIXME: remove */
2015 if (runtime->dma_bytes) {
2016 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2017 if (err < 0)
2018 return err;
2019 }
2020
2021 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2022 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2023 snd_pcm_hw_rule_rate, hw,
2024 SNDRV_PCM_HW_PARAM_RATE, -1);
2025 if (err < 0)
2026 return err;
2027 }
2028
2029 /* FIXME: this belong to lowlevel */
2030 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2031
2032 return 0;
2033 }
2034
2035 static void pcm_release_private(struct snd_pcm_substream *substream)
2036 {
2037 snd_pcm_unlink(substream);
2038 }
2039
2040 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2041 {
2042 substream->ref_count--;
2043 if (substream->ref_count > 0)
2044 return;
2045
2046 snd_pcm_drop(substream);
2047 if (substream->hw_opened) {
2048 if (substream->ops->hw_free != NULL)
2049 substream->ops->hw_free(substream);
2050 substream->ops->close(substream);
2051 substream->hw_opened = 0;
2052 }
2053 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2054 pm_qos_remove_request(&substream->latency_pm_qos_req);
2055 if (substream->pcm_release) {
2056 substream->pcm_release(substream);
2057 substream->pcm_release = NULL;
2058 }
2059 snd_pcm_detach_substream(substream);
2060 }
2061
2062 EXPORT_SYMBOL(snd_pcm_release_substream);
2063
2064 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2065 struct file *file,
2066 struct snd_pcm_substream **rsubstream)
2067 {
2068 struct snd_pcm_substream *substream;
2069 int err;
2070
2071 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2072 if (err < 0)
2073 return err;
2074 if (substream->ref_count > 1) {
2075 *rsubstream = substream;
2076 return 0;
2077 }
2078
2079 err = snd_pcm_hw_constraints_init(substream);
2080 if (err < 0) {
2081 snd_printd("snd_pcm_hw_constraints_init failed\n");
2082 goto error;
2083 }
2084
2085 if ((err = substream->ops->open(substream)) < 0)
2086 goto error;
2087
2088 substream->hw_opened = 1;
2089
2090 err = snd_pcm_hw_constraints_complete(substream);
2091 if (err < 0) {
2092 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2093 goto error;
2094 }
2095
2096 *rsubstream = substream;
2097 return 0;
2098
2099 error:
2100 snd_pcm_release_substream(substream);
2101 return err;
2102 }
2103
2104 EXPORT_SYMBOL(snd_pcm_open_substream);
2105
2106 static int snd_pcm_open_file(struct file *file,
2107 struct snd_pcm *pcm,
2108 int stream)
2109 {
2110 struct snd_pcm_file *pcm_file;
2111 struct snd_pcm_substream *substream;
2112 int err;
2113
2114 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2115 if (err < 0)
2116 return err;
2117
2118 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2119 if (pcm_file == NULL) {
2120 snd_pcm_release_substream(substream);
2121 return -ENOMEM;
2122 }
2123 pcm_file->substream = substream;
2124 if (substream->ref_count == 1) {
2125 substream->file = pcm_file;
2126 substream->pcm_release = pcm_release_private;
2127 }
2128 file->private_data = pcm_file;
2129
2130 return 0;
2131 }
2132
2133 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2134 {
2135 struct snd_pcm *pcm;
2136 int err = nonseekable_open(inode, file);
2137 if (err < 0)
2138 return err;
2139 pcm = snd_lookup_minor_data(iminor(inode),
2140 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2141 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2142 if (pcm)
2143 snd_card_unref(pcm->card);
2144 return err;
2145 }
2146
2147 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2148 {
2149 struct snd_pcm *pcm;
2150 int err = nonseekable_open(inode, file);
2151 if (err < 0)
2152 return err;
2153 pcm = snd_lookup_minor_data(iminor(inode),
2154 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2155 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2156 if (pcm)
2157 snd_card_unref(pcm->card);
2158 return err;
2159 }
2160
2161 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2162 {
2163 int err;
2164 wait_queue_t wait;
2165
2166 if (pcm == NULL) {
2167 err = -ENODEV;
2168 goto __error1;
2169 }
2170 err = snd_card_file_add(pcm->card, file);
2171 if (err < 0)
2172 goto __error1;
2173 if (!try_module_get(pcm->card->module)) {
2174 err = -EFAULT;
2175 goto __error2;
2176 }
2177 init_waitqueue_entry(&wait, current);
2178 add_wait_queue(&pcm->open_wait, &wait);
2179 mutex_lock(&pcm->open_mutex);
2180 while (1) {
2181 err = snd_pcm_open_file(file, pcm, stream);
2182 if (err >= 0)
2183 break;
2184 if (err == -EAGAIN) {
2185 if (file->f_flags & O_NONBLOCK) {
2186 err = -EBUSY;
2187 break;
2188 }
2189 } else
2190 break;
2191 set_current_state(TASK_INTERRUPTIBLE);
2192 mutex_unlock(&pcm->open_mutex);
2193 schedule();
2194 mutex_lock(&pcm->open_mutex);
2195 if (pcm->card->shutdown) {
2196 err = -ENODEV;
2197 break;
2198 }
2199 if (signal_pending(current)) {
2200 err = -ERESTARTSYS;
2201 break;
2202 }
2203 }
2204 remove_wait_queue(&pcm->open_wait, &wait);
2205 mutex_unlock(&pcm->open_mutex);
2206 if (err < 0)
2207 goto __error;
2208 return err;
2209
2210 __error:
2211 module_put(pcm->card->module);
2212 __error2:
2213 snd_card_file_remove(pcm->card, file);
2214 __error1:
2215 return err;
2216 }
2217
2218 static int snd_pcm_release(struct inode *inode, struct file *file)
2219 {
2220 struct snd_pcm *pcm;
2221 struct snd_pcm_substream *substream;
2222 struct snd_pcm_file *pcm_file;
2223
2224 pcm_file = file->private_data;
2225 substream = pcm_file->substream;
2226 if (snd_BUG_ON(!substream))
2227 return -ENXIO;
2228 pcm = substream->pcm;
2229 mutex_lock(&pcm->open_mutex);
2230 snd_pcm_release_substream(substream);
2231 kfree(pcm_file);
2232 mutex_unlock(&pcm->open_mutex);
2233 wake_up(&pcm->open_wait);
2234 module_put(pcm->card->module);
2235 snd_card_file_remove(pcm->card, file);
2236 return 0;
2237 }
2238
2239 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2240 snd_pcm_uframes_t frames)
2241 {
2242 struct snd_pcm_runtime *runtime = substream->runtime;
2243 snd_pcm_sframes_t appl_ptr;
2244 snd_pcm_sframes_t ret;
2245 snd_pcm_sframes_t hw_avail;
2246
2247 if (frames == 0)
2248 return 0;
2249
2250 snd_pcm_stream_lock_irq(substream);
2251 switch (runtime->status->state) {
2252 case SNDRV_PCM_STATE_PREPARED:
2253 break;
2254 case SNDRV_PCM_STATE_DRAINING:
2255 case SNDRV_PCM_STATE_RUNNING:
2256 if (snd_pcm_update_hw_ptr(substream) >= 0)
2257 break;
2258 /* Fall through */
2259 case SNDRV_PCM_STATE_XRUN:
2260 ret = -EPIPE;
2261 goto __end;
2262 case SNDRV_PCM_STATE_SUSPENDED:
2263 ret = -ESTRPIPE;
2264 goto __end;
2265 default:
2266 ret = -EBADFD;
2267 goto __end;
2268 }
2269
2270 hw_avail = snd_pcm_playback_hw_avail(runtime);
2271 if (hw_avail <= 0) {
2272 ret = 0;
2273 goto __end;
2274 }
2275 if (frames > (snd_pcm_uframes_t)hw_avail)
2276 frames = hw_avail;
2277 appl_ptr = runtime->control->appl_ptr - frames;
2278 if (appl_ptr < 0)
2279 appl_ptr += runtime->boundary;
2280 runtime->control->appl_ptr = appl_ptr;
2281 ret = frames;
2282 __end:
2283 snd_pcm_stream_unlock_irq(substream);
2284 return ret;
2285 }
2286
2287 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2288 snd_pcm_uframes_t frames)
2289 {
2290 struct snd_pcm_runtime *runtime = substream->runtime;
2291 snd_pcm_sframes_t appl_ptr;
2292 snd_pcm_sframes_t ret;
2293 snd_pcm_sframes_t hw_avail;
2294
2295 if (frames == 0)
2296 return 0;
2297
2298 snd_pcm_stream_lock_irq(substream);
2299 switch (runtime->status->state) {
2300 case SNDRV_PCM_STATE_PREPARED:
2301 case SNDRV_PCM_STATE_DRAINING:
2302 break;
2303 case SNDRV_PCM_STATE_RUNNING:
2304 if (snd_pcm_update_hw_ptr(substream) >= 0)
2305 break;
2306 /* Fall through */
2307 case SNDRV_PCM_STATE_XRUN:
2308 ret = -EPIPE;
2309 goto __end;
2310 case SNDRV_PCM_STATE_SUSPENDED:
2311 ret = -ESTRPIPE;
2312 goto __end;
2313 default:
2314 ret = -EBADFD;
2315 goto __end;
2316 }
2317
2318 hw_avail = snd_pcm_capture_hw_avail(runtime);
2319 if (hw_avail <= 0) {
2320 ret = 0;
2321 goto __end;
2322 }
2323 if (frames > (snd_pcm_uframes_t)hw_avail)
2324 frames = hw_avail;
2325 appl_ptr = runtime->control->appl_ptr - frames;
2326 if (appl_ptr < 0)
2327 appl_ptr += runtime->boundary;
2328 runtime->control->appl_ptr = appl_ptr;
2329 ret = frames;
2330 __end:
2331 snd_pcm_stream_unlock_irq(substream);
2332 return ret;
2333 }
2334
2335 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2336 snd_pcm_uframes_t frames)
2337 {
2338 struct snd_pcm_runtime *runtime = substream->runtime;
2339 snd_pcm_sframes_t appl_ptr;
2340 snd_pcm_sframes_t ret;
2341 snd_pcm_sframes_t avail;
2342
2343 if (frames == 0)
2344 return 0;
2345
2346 snd_pcm_stream_lock_irq(substream);
2347 switch (runtime->status->state) {
2348 case SNDRV_PCM_STATE_PREPARED:
2349 case SNDRV_PCM_STATE_PAUSED:
2350 break;
2351 case SNDRV_PCM_STATE_DRAINING:
2352 case SNDRV_PCM_STATE_RUNNING:
2353 if (snd_pcm_update_hw_ptr(substream) >= 0)
2354 break;
2355 /* Fall through */
2356 case SNDRV_PCM_STATE_XRUN:
2357 ret = -EPIPE;
2358 goto __end;
2359 case SNDRV_PCM_STATE_SUSPENDED:
2360 ret = -ESTRPIPE;
2361 goto __end;
2362 default:
2363 ret = -EBADFD;
2364 goto __end;
2365 }
2366
2367 avail = snd_pcm_playback_avail(runtime);
2368 if (avail <= 0) {
2369 ret = 0;
2370 goto __end;
2371 }
2372 if (frames > (snd_pcm_uframes_t)avail)
2373 frames = avail;
2374 appl_ptr = runtime->control->appl_ptr + frames;
2375 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2376 appl_ptr -= runtime->boundary;
2377 runtime->control->appl_ptr = appl_ptr;
2378 ret = frames;
2379 __end:
2380 snd_pcm_stream_unlock_irq(substream);
2381 return ret;
2382 }
2383
2384 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2385 snd_pcm_uframes_t frames)
2386 {
2387 struct snd_pcm_runtime *runtime = substream->runtime;
2388 snd_pcm_sframes_t appl_ptr;
2389 snd_pcm_sframes_t ret;
2390 snd_pcm_sframes_t avail;
2391
2392 if (frames == 0)
2393 return 0;
2394
2395 snd_pcm_stream_lock_irq(substream);
2396 switch (runtime->status->state) {
2397 case SNDRV_PCM_STATE_PREPARED:
2398 case SNDRV_PCM_STATE_DRAINING:
2399 case SNDRV_PCM_STATE_PAUSED:
2400 break;
2401 case SNDRV_PCM_STATE_RUNNING:
2402 if (snd_pcm_update_hw_ptr(substream) >= 0)
2403 break;
2404 /* Fall through */
2405 case SNDRV_PCM_STATE_XRUN:
2406 ret = -EPIPE;
2407 goto __end;
2408 case SNDRV_PCM_STATE_SUSPENDED:
2409 ret = -ESTRPIPE;
2410 goto __end;
2411 default:
2412 ret = -EBADFD;
2413 goto __end;
2414 }
2415
2416 avail = snd_pcm_capture_avail(runtime);
2417 if (avail <= 0) {
2418 ret = 0;
2419 goto __end;
2420 }
2421 if (frames > (snd_pcm_uframes_t)avail)
2422 frames = avail;
2423 appl_ptr = runtime->control->appl_ptr + frames;
2424 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2425 appl_ptr -= runtime->boundary;
2426 runtime->control->appl_ptr = appl_ptr;
2427 ret = frames;
2428 __end:
2429 snd_pcm_stream_unlock_irq(substream);
2430 return ret;
2431 }
2432
2433 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2434 {
2435 struct snd_pcm_runtime *runtime = substream->runtime;
2436 int err;
2437
2438 snd_pcm_stream_lock_irq(substream);
2439 switch (runtime->status->state) {
2440 case SNDRV_PCM_STATE_DRAINING:
2441 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2442 goto __badfd;
2443 case SNDRV_PCM_STATE_RUNNING:
2444 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2445 break;
2446 /* Fall through */
2447 case SNDRV_PCM_STATE_PREPARED:
2448 case SNDRV_PCM_STATE_SUSPENDED:
2449 err = 0;
2450 break;
2451 case SNDRV_PCM_STATE_XRUN:
2452 err = -EPIPE;
2453 break;
2454 default:
2455 __badfd:
2456 err = -EBADFD;
2457 break;
2458 }
2459 snd_pcm_stream_unlock_irq(substream);
2460 return err;
2461 }
2462
2463 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2464 snd_pcm_sframes_t __user *res)
2465 {
2466 struct snd_pcm_runtime *runtime = substream->runtime;
2467 int err;
2468 snd_pcm_sframes_t n = 0;
2469
2470 snd_pcm_stream_lock_irq(substream);
2471 switch (runtime->status->state) {
2472 case SNDRV_PCM_STATE_DRAINING:
2473 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2474 goto __badfd;
2475 case SNDRV_PCM_STATE_RUNNING:
2476 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2477 break;
2478 /* Fall through */
2479 case SNDRV_PCM_STATE_PREPARED:
2480 case SNDRV_PCM_STATE_SUSPENDED:
2481 err = 0;
2482 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2483 n = snd_pcm_playback_hw_avail(runtime);
2484 else
2485 n = snd_pcm_capture_avail(runtime);
2486 n += runtime->delay;
2487 break;
2488 case SNDRV_PCM_STATE_XRUN:
2489 err = -EPIPE;
2490 break;
2491 default:
2492 __badfd:
2493 err = -EBADFD;
2494 break;
2495 }
2496 snd_pcm_stream_unlock_irq(substream);
2497 if (!err)
2498 if (put_user(n, res))
2499 err = -EFAULT;
2500 return err;
2501 }
2502
2503 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2504 struct snd_pcm_sync_ptr __user *_sync_ptr)
2505 {
2506 struct snd_pcm_runtime *runtime = substream->runtime;
2507 struct snd_pcm_sync_ptr sync_ptr;
2508 volatile struct snd_pcm_mmap_status *status;
2509 volatile struct snd_pcm_mmap_control *control;
2510 int err;
2511
2512 memset(&sync_ptr, 0, sizeof(sync_ptr));
2513 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2514 return -EFAULT;
2515 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2516 return -EFAULT;
2517 status = runtime->status;
2518 control = runtime->control;
2519 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2520 err = snd_pcm_hwsync(substream);
2521 if (err < 0)
2522 return err;
2523 }
2524 snd_pcm_stream_lock_irq(substream);
2525 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2526 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2527 else
2528 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2529 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2530 control->avail_min = sync_ptr.c.control.avail_min;
2531 else
2532 sync_ptr.c.control.avail_min = control->avail_min;
2533 sync_ptr.s.status.state = status->state;
2534 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2535 sync_ptr.s.status.tstamp = status->tstamp;
2536 sync_ptr.s.status.suspended_state = status->suspended_state;
2537 snd_pcm_stream_unlock_irq(substream);
2538 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2539 return -EFAULT;
2540 return 0;
2541 }
2542
2543 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2544 {
2545 struct snd_pcm_runtime *runtime = substream->runtime;
2546 int arg;
2547
2548 if (get_user(arg, _arg))
2549 return -EFAULT;
2550 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2551 return -EINVAL;
2552 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2553 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2554 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2555 return 0;
2556 }
2557
2558 static int snd_pcm_common_ioctl1(struct file *file,
2559 struct snd_pcm_substream *substream,
2560 unsigned int cmd, void __user *arg)
2561 {
2562 switch (cmd) {
2563 case SNDRV_PCM_IOCTL_PVERSION:
2564 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2565 case SNDRV_PCM_IOCTL_INFO:
2566 return snd_pcm_info_user(substream, arg);
2567 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2568 return 0;
2569 case SNDRV_PCM_IOCTL_TTSTAMP:
2570 return snd_pcm_tstamp(substream, arg);
2571 case SNDRV_PCM_IOCTL_HW_REFINE:
2572 return snd_pcm_hw_refine_user(substream, arg);
2573 case SNDRV_PCM_IOCTL_HW_PARAMS:
2574 return snd_pcm_hw_params_user(substream, arg);
2575 case SNDRV_PCM_IOCTL_HW_FREE:
2576 return snd_pcm_hw_free(substream);
2577 case SNDRV_PCM_IOCTL_SW_PARAMS:
2578 return snd_pcm_sw_params_user(substream, arg);
2579 case SNDRV_PCM_IOCTL_STATUS:
2580 return snd_pcm_status_user(substream, arg);
2581 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2582 return snd_pcm_channel_info_user(substream, arg);
2583 case SNDRV_PCM_IOCTL_PREPARE:
2584 return snd_pcm_prepare(substream, file);
2585 case SNDRV_PCM_IOCTL_RESET:
2586 return snd_pcm_reset(substream);
2587 case SNDRV_PCM_IOCTL_START:
2588 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2589 case SNDRV_PCM_IOCTL_LINK:
2590 return snd_pcm_link(substream, (int)(unsigned long) arg);
2591 case SNDRV_PCM_IOCTL_UNLINK:
2592 return snd_pcm_unlink(substream);
2593 case SNDRV_PCM_IOCTL_RESUME:
2594 return snd_pcm_resume(substream);
2595 case SNDRV_PCM_IOCTL_XRUN:
2596 return snd_pcm_xrun(substream);
2597 case SNDRV_PCM_IOCTL_HWSYNC:
2598 return snd_pcm_hwsync(substream);
2599 case SNDRV_PCM_IOCTL_DELAY:
2600 return snd_pcm_delay(substream, arg);
2601 case SNDRV_PCM_IOCTL_SYNC_PTR:
2602 return snd_pcm_sync_ptr(substream, arg);
2603 #ifdef CONFIG_SND_SUPPORT_OLD_API
2604 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2605 return snd_pcm_hw_refine_old_user(substream, arg);
2606 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2607 return snd_pcm_hw_params_old_user(substream, arg);
2608 #endif
2609 case SNDRV_PCM_IOCTL_DRAIN:
2610 return snd_pcm_drain(substream, file);
2611 case SNDRV_PCM_IOCTL_DROP:
2612 return snd_pcm_drop(substream);
2613 case SNDRV_PCM_IOCTL_PAUSE:
2614 {
2615 int res;
2616 snd_pcm_stream_lock_irq(substream);
2617 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2618 snd_pcm_stream_unlock_irq(substream);
2619 return res;
2620 }
2621 }
2622 snd_printd("unknown ioctl = 0x%x\n", cmd);
2623 return -ENOTTY;
2624 }
2625
2626 static int snd_pcm_playback_ioctl1(struct file *file,
2627 struct snd_pcm_substream *substream,
2628 unsigned int cmd, void __user *arg)
2629 {
2630 if (snd_BUG_ON(!substream))
2631 return -ENXIO;
2632 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2633 return -EINVAL;
2634 switch (cmd) {
2635 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2636 {
2637 struct snd_xferi xferi;
2638 struct snd_xferi __user *_xferi = arg;
2639 struct snd_pcm_runtime *runtime = substream->runtime;
2640 snd_pcm_sframes_t result;
2641 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2642 return -EBADFD;
2643 if (put_user(0, &_xferi->result))
2644 return -EFAULT;
2645 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2646 return -EFAULT;
2647 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2648 __put_user(result, &_xferi->result);
2649 return result < 0 ? result : 0;
2650 }
2651 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2652 {
2653 struct snd_xfern xfern;
2654 struct snd_xfern __user *_xfern = arg;
2655 struct snd_pcm_runtime *runtime = substream->runtime;
2656 void __user **bufs;
2657 snd_pcm_sframes_t result;
2658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2659 return -EBADFD;
2660 if (runtime->channels > 128)
2661 return -EINVAL;
2662 if (put_user(0, &_xfern->result))
2663 return -EFAULT;
2664 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2665 return -EFAULT;
2666
2667 bufs = memdup_user(xfern.bufs,
2668 sizeof(void *) * runtime->channels);
2669 if (IS_ERR(bufs))
2670 return PTR_ERR(bufs);
2671 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2672 kfree(bufs);
2673 __put_user(result, &_xfern->result);
2674 return result < 0 ? result : 0;
2675 }
2676 case SNDRV_PCM_IOCTL_REWIND:
2677 {
2678 snd_pcm_uframes_t frames;
2679 snd_pcm_uframes_t __user *_frames = arg;
2680 snd_pcm_sframes_t result;
2681 if (get_user(frames, _frames))
2682 return -EFAULT;
2683 if (put_user(0, _frames))
2684 return -EFAULT;
2685 result = snd_pcm_playback_rewind(substream, frames);
2686 __put_user(result, _frames);
2687 return result < 0 ? result : 0;
2688 }
2689 case SNDRV_PCM_IOCTL_FORWARD:
2690 {
2691 snd_pcm_uframes_t frames;
2692 snd_pcm_uframes_t __user *_frames = arg;
2693 snd_pcm_sframes_t result;
2694 if (get_user(frames, _frames))
2695 return -EFAULT;
2696 if (put_user(0, _frames))
2697 return -EFAULT;
2698 result = snd_pcm_playback_forward(substream, frames);
2699 __put_user(result, _frames);
2700 return result < 0 ? result : 0;
2701 }
2702 }
2703 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2704 }
2705
2706 static int snd_pcm_capture_ioctl1(struct file *file,
2707 struct snd_pcm_substream *substream,
2708 unsigned int cmd, void __user *arg)
2709 {
2710 if (snd_BUG_ON(!substream))
2711 return -ENXIO;
2712 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2713 return -EINVAL;
2714 switch (cmd) {
2715 case SNDRV_PCM_IOCTL_READI_FRAMES:
2716 {
2717 struct snd_xferi xferi;
2718 struct snd_xferi __user *_xferi = arg;
2719 struct snd_pcm_runtime *runtime = substream->runtime;
2720 snd_pcm_sframes_t result;
2721 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2722 return -EBADFD;
2723 if (put_user(0, &_xferi->result))
2724 return -EFAULT;
2725 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2726 return -EFAULT;
2727 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2728 __put_user(result, &_xferi->result);
2729 return result < 0 ? result : 0;
2730 }
2731 case SNDRV_PCM_IOCTL_READN_FRAMES:
2732 {
2733 struct snd_xfern xfern;
2734 struct snd_xfern __user *_xfern = arg;
2735 struct snd_pcm_runtime *runtime = substream->runtime;
2736 void *bufs;
2737 snd_pcm_sframes_t result;
2738 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2739 return -EBADFD;
2740 if (runtime->channels > 128)
2741 return -EINVAL;
2742 if (put_user(0, &_xfern->result))
2743 return -EFAULT;
2744 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2745 return -EFAULT;
2746
2747 bufs = memdup_user(xfern.bufs,
2748 sizeof(void *) * runtime->channels);
2749 if (IS_ERR(bufs))
2750 return PTR_ERR(bufs);
2751 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2752 kfree(bufs);
2753 __put_user(result, &_xfern->result);
2754 return result < 0 ? result : 0;
2755 }
2756 case SNDRV_PCM_IOCTL_REWIND:
2757 {
2758 snd_pcm_uframes_t frames;
2759 snd_pcm_uframes_t __user *_frames = arg;
2760 snd_pcm_sframes_t result;
2761 if (get_user(frames, _frames))
2762 return -EFAULT;
2763 if (put_user(0, _frames))
2764 return -EFAULT;
2765 result = snd_pcm_capture_rewind(substream, frames);
2766 __put_user(result, _frames);
2767 return result < 0 ? result : 0;
2768 }
2769 case SNDRV_PCM_IOCTL_FORWARD:
2770 {
2771 snd_pcm_uframes_t frames;
2772 snd_pcm_uframes_t __user *_frames = arg;
2773 snd_pcm_sframes_t result;
2774 if (get_user(frames, _frames))
2775 return -EFAULT;
2776 if (put_user(0, _frames))
2777 return -EFAULT;
2778 result = snd_pcm_capture_forward(substream, frames);
2779 __put_user(result, _frames);
2780 return result < 0 ? result : 0;
2781 }
2782 }
2783 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2784 }
2785
2786 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2787 unsigned long arg)
2788 {
2789 struct snd_pcm_file *pcm_file;
2790
2791 pcm_file = file->private_data;
2792
2793 if (((cmd >> 8) & 0xff) != 'A')
2794 return -ENOTTY;
2795
2796 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2797 (void __user *)arg);
2798 }
2799
2800 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2801 unsigned long arg)
2802 {
2803 struct snd_pcm_file *pcm_file;
2804
2805 pcm_file = file->private_data;
2806
2807 if (((cmd >> 8) & 0xff) != 'A')
2808 return -ENOTTY;
2809
2810 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2811 (void __user *)arg);
2812 }
2813
2814 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2815 unsigned int cmd, void *arg)
2816 {
2817 mm_segment_t fs;
2818 int result;
2819
2820 fs = snd_enter_user();
2821 switch (substream->stream) {
2822 case SNDRV_PCM_STREAM_PLAYBACK:
2823 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2824 (void __user *)arg);
2825 break;
2826 case SNDRV_PCM_STREAM_CAPTURE:
2827 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2828 (void __user *)arg);
2829 break;
2830 default:
2831 result = -EINVAL;
2832 break;
2833 }
2834 snd_leave_user(fs);
2835 return result;
2836 }
2837
2838 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2839
2840 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2841 loff_t * offset)
2842 {
2843 struct snd_pcm_file *pcm_file;
2844 struct snd_pcm_substream *substream;
2845 struct snd_pcm_runtime *runtime;
2846 snd_pcm_sframes_t result;
2847
2848 pcm_file = file->private_data;
2849 substream = pcm_file->substream;
2850 if (PCM_RUNTIME_CHECK(substream))
2851 return -ENXIO;
2852 runtime = substream->runtime;
2853 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2854 return -EBADFD;
2855 if (!frame_aligned(runtime, count))
2856 return -EINVAL;
2857 count = bytes_to_frames(runtime, count);
2858 result = snd_pcm_lib_read(substream, buf, count);
2859 if (result > 0)
2860 result = frames_to_bytes(runtime, result);
2861 return result;
2862 }
2863
2864 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2865 size_t count, loff_t * offset)
2866 {
2867 struct snd_pcm_file *pcm_file;
2868 struct snd_pcm_substream *substream;
2869 struct snd_pcm_runtime *runtime;
2870 snd_pcm_sframes_t result;
2871
2872 pcm_file = file->private_data;
2873 substream = pcm_file->substream;
2874 if (PCM_RUNTIME_CHECK(substream))
2875 return -ENXIO;
2876 runtime = substream->runtime;
2877 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2878 return -EBADFD;
2879 if (!frame_aligned(runtime, count))
2880 return -EINVAL;
2881 count = bytes_to_frames(runtime, count);
2882 result = snd_pcm_lib_write(substream, buf, count);
2883 if (result > 0)
2884 result = frames_to_bytes(runtime, result);
2885 return result;
2886 }
2887
2888 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2889 unsigned long nr_segs, loff_t pos)
2890
2891 {
2892 struct snd_pcm_file *pcm_file;
2893 struct snd_pcm_substream *substream;
2894 struct snd_pcm_runtime *runtime;
2895 snd_pcm_sframes_t result;
2896 unsigned long i;
2897 void __user **bufs;
2898 snd_pcm_uframes_t frames;
2899
2900 pcm_file = iocb->ki_filp->private_data;
2901 substream = pcm_file->substream;
2902 if (PCM_RUNTIME_CHECK(substream))
2903 return -ENXIO;
2904 runtime = substream->runtime;
2905 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2906 return -EBADFD;
2907 if (nr_segs > 1024 || nr_segs != runtime->channels)
2908 return -EINVAL;
2909 if (!frame_aligned(runtime, iov->iov_len))
2910 return -EINVAL;
2911 frames = bytes_to_samples(runtime, iov->iov_len);
2912 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2913 if (bufs == NULL)
2914 return -ENOMEM;
2915 for (i = 0; i < nr_segs; ++i)
2916 bufs[i] = iov[i].iov_base;
2917 result = snd_pcm_lib_readv(substream, bufs, frames);
2918 if (result > 0)
2919 result = frames_to_bytes(runtime, result);
2920 kfree(bufs);
2921 return result;
2922 }
2923
2924 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2925 unsigned long nr_segs, loff_t pos)
2926 {
2927 struct snd_pcm_file *pcm_file;
2928 struct snd_pcm_substream *substream;
2929 struct snd_pcm_runtime *runtime;
2930 snd_pcm_sframes_t result;
2931 unsigned long i;
2932 void __user **bufs;
2933 snd_pcm_uframes_t frames;
2934
2935 pcm_file = iocb->ki_filp->private_data;
2936 substream = pcm_file->substream;
2937 if (PCM_RUNTIME_CHECK(substream))
2938 return -ENXIO;
2939 runtime = substream->runtime;
2940 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2941 return -EBADFD;
2942 if (nr_segs > 128 || nr_segs != runtime->channels ||
2943 !frame_aligned(runtime, iov->iov_len))
2944 return -EINVAL;
2945 frames = bytes_to_samples(runtime, iov->iov_len);
2946 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2947 if (bufs == NULL)
2948 return -ENOMEM;
2949 for (i = 0; i < nr_segs; ++i)
2950 bufs[i] = iov[i].iov_base;
2951 result = snd_pcm_lib_writev(substream, bufs, frames);
2952 if (result > 0)
2953 result = frames_to_bytes(runtime, result);
2954 kfree(bufs);
2955 return result;
2956 }
2957
2958 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2959 {
2960 struct snd_pcm_file *pcm_file;
2961 struct snd_pcm_substream *substream;
2962 struct snd_pcm_runtime *runtime;
2963 unsigned int mask;
2964 snd_pcm_uframes_t avail;
2965
2966 pcm_file = file->private_data;
2967
2968 substream = pcm_file->substream;
2969 if (PCM_RUNTIME_CHECK(substream))
2970 return -ENXIO;
2971 runtime = substream->runtime;
2972
2973 poll_wait(file, &runtime->sleep, wait);
2974
2975 snd_pcm_stream_lock_irq(substream);
2976 avail = snd_pcm_playback_avail(runtime);
2977 switch (runtime->status->state) {
2978 case SNDRV_PCM_STATE_RUNNING:
2979 case SNDRV_PCM_STATE_PREPARED:
2980 case SNDRV_PCM_STATE_PAUSED:
2981 if (avail >= runtime->control->avail_min) {
2982 mask = POLLOUT | POLLWRNORM;
2983 break;
2984 }
2985 /* Fall through */
2986 case SNDRV_PCM_STATE_DRAINING:
2987 mask = 0;
2988 break;
2989 default:
2990 mask = POLLOUT | POLLWRNORM | POLLERR;
2991 break;
2992 }
2993 snd_pcm_stream_unlock_irq(substream);
2994 return mask;
2995 }
2996
2997 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2998 {
2999 struct snd_pcm_file *pcm_file;
3000 struct snd_pcm_substream *substream;
3001 struct snd_pcm_runtime *runtime;
3002 unsigned int mask;
3003 snd_pcm_uframes_t avail;
3004
3005 pcm_file = file->private_data;
3006
3007 substream = pcm_file->substream;
3008 if (PCM_RUNTIME_CHECK(substream))
3009 return -ENXIO;
3010 runtime = substream->runtime;
3011
3012 poll_wait(file, &runtime->sleep, wait);
3013
3014 snd_pcm_stream_lock_irq(substream);
3015 avail = snd_pcm_capture_avail(runtime);
3016 switch (runtime->status->state) {
3017 case SNDRV_PCM_STATE_RUNNING:
3018 case SNDRV_PCM_STATE_PREPARED:
3019 case SNDRV_PCM_STATE_PAUSED:
3020 if (avail >= runtime->control->avail_min) {
3021 mask = POLLIN | POLLRDNORM;
3022 break;
3023 }
3024 mask = 0;
3025 break;
3026 case SNDRV_PCM_STATE_DRAINING:
3027 if (avail > 0) {
3028 mask = POLLIN | POLLRDNORM;
3029 break;
3030 }
3031 /* Fall through */
3032 default:
3033 mask = POLLIN | POLLRDNORM | POLLERR;
3034 break;
3035 }
3036 snd_pcm_stream_unlock_irq(substream);
3037 return mask;
3038 }
3039
3040 /*
3041 * mmap support
3042 */
3043
3044 /*
3045 * Only on coherent architectures, we can mmap the status and the control records
3046 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3047 */
3048 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3049 /*
3050 * mmap status record
3051 */
3052 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3053 struct vm_fault *vmf)
3054 {
3055 struct snd_pcm_substream *substream = area->vm_private_data;
3056 struct snd_pcm_runtime *runtime;
3057
3058 if (substream == NULL)
3059 return VM_FAULT_SIGBUS;
3060 runtime = substream->runtime;
3061 vmf->page = virt_to_page(runtime->status);
3062 get_page(vmf->page);
3063 return 0;
3064 }
3065
3066 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3067 {
3068 .fault = snd_pcm_mmap_status_fault,
3069 };
3070
3071 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3072 struct vm_area_struct *area)
3073 {
3074 long size;
3075 if (!(area->vm_flags & VM_READ))
3076 return -EINVAL;
3077 size = area->vm_end - area->vm_start;
3078 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3079 return -EINVAL;
3080 area->vm_ops = &snd_pcm_vm_ops_status;
3081 area->vm_private_data = substream;
3082 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3083 return 0;
3084 }
3085
3086 /*
3087 * mmap control record
3088 */
3089 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3090 struct vm_fault *vmf)
3091 {
3092 struct snd_pcm_substream *substream = area->vm_private_data;
3093 struct snd_pcm_runtime *runtime;
3094
3095 if (substream == NULL)
3096 return VM_FAULT_SIGBUS;
3097 runtime = substream->runtime;
3098 vmf->page = virt_to_page(runtime->control);
3099 get_page(vmf->page);
3100 return 0;
3101 }
3102
3103 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3104 {
3105 .fault = snd_pcm_mmap_control_fault,
3106 };
3107
3108 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3109 struct vm_area_struct *area)
3110 {
3111 long size;
3112 if (!(area->vm_flags & VM_READ))
3113 return -EINVAL;
3114 size = area->vm_end - area->vm_start;
3115 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3116 return -EINVAL;
3117 area->vm_ops = &snd_pcm_vm_ops_control;
3118 area->vm_private_data = substream;
3119 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3120 return 0;
3121 }
3122 #else /* ! coherent mmap */
3123 /*
3124 * don't support mmap for status and control records.
3125 */
3126 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3127 struct vm_area_struct *area)
3128 {
3129 return -ENXIO;
3130 }
3131 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3132 struct vm_area_struct *area)
3133 {
3134 return -ENXIO;
3135 }
3136 #endif /* coherent mmap */
3137
3138 static inline struct page *
3139 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3140 {
3141 void *vaddr = substream->runtime->dma_area + ofs;
3142 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3143 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3144 return virt_to_page(CAC_ADDR(vaddr));
3145 #endif
3146 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3147 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3148 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3149 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3150 /* assume dma_handle set via pfn_to_phys() in
3151 * mm/dma-noncoherent.c
3152 */
3153 return pfn_to_page(addr >> PAGE_SHIFT);
3154 }
3155 #endif
3156 return virt_to_page(vaddr);
3157 }
3158
3159 /*
3160 * fault callback for mmapping a RAM page
3161 */
3162 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3163 struct vm_fault *vmf)
3164 {
3165 struct snd_pcm_substream *substream = area->vm_private_data;
3166 struct snd_pcm_runtime *runtime;
3167 unsigned long offset;
3168 struct page * page;
3169 size_t dma_bytes;
3170
3171 if (substream == NULL)
3172 return VM_FAULT_SIGBUS;
3173 runtime = substream->runtime;
3174 offset = vmf->pgoff << PAGE_SHIFT;
3175 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3176 if (offset > dma_bytes - PAGE_SIZE)
3177 return VM_FAULT_SIGBUS;
3178 if (substream->ops->page)
3179 page = substream->ops->page(substream, offset);
3180 else
3181 page = snd_pcm_default_page_ops(substream, offset);
3182 if (!page)
3183 return VM_FAULT_SIGBUS;
3184 get_page(page);
3185 vmf->page = page;
3186 return 0;
3187 }
3188
3189 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3190 .open = snd_pcm_mmap_data_open,
3191 .close = snd_pcm_mmap_data_close,
3192 };
3193
3194 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3195 .open = snd_pcm_mmap_data_open,
3196 .close = snd_pcm_mmap_data_close,
3197 .fault = snd_pcm_mmap_data_fault,
3198 };
3199
3200 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3201 /* This should be defined / handled globally! */
3202 #if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
3203 #define ARCH_HAS_DMA_MMAP_COHERENT
3204 #endif
3205 #endif
3206
3207 /*
3208 * mmap the DMA buffer on RAM
3209 */
3210 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3211 struct vm_area_struct *area)
3212 {
3213 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3214 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3215 if (!substream->ops->page &&
3216 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3217 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3218 area,
3219 substream->runtime->dma_area,
3220 substream->runtime->dma_addr,
3221 area->vm_end - area->vm_start);
3222 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3223 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3224 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3225 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3226 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3227 /* mmap with fault handler */
3228 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3229 return 0;
3230 }
3231 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3232
3233 /*
3234 * mmap the DMA buffer on I/O memory area
3235 */
3236 #if SNDRV_PCM_INFO_MMAP_IOMEM
3237 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3238 struct vm_area_struct *area)
3239 {
3240 struct snd_pcm_runtime *runtime = substream->runtime;;
3241
3242 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3243 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3244 }
3245
3246 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3247 #endif /* SNDRV_PCM_INFO_MMAP */
3248
3249 /*
3250 * mmap DMA buffer
3251 */
3252 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3253 struct vm_area_struct *area)
3254 {
3255 struct snd_pcm_runtime *runtime;
3256 long size;
3257 unsigned long offset;
3258 size_t dma_bytes;
3259 int err;
3260
3261 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3262 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3263 return -EINVAL;
3264 } else {
3265 if (!(area->vm_flags & VM_READ))
3266 return -EINVAL;
3267 }
3268 runtime = substream->runtime;
3269 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3270 return -EBADFD;
3271 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3272 return -ENXIO;
3273 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3274 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3275 return -EINVAL;
3276 size = area->vm_end - area->vm_start;
3277 offset = area->vm_pgoff << PAGE_SHIFT;
3278 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3279 if ((size_t)size > dma_bytes)
3280 return -EINVAL;
3281 if (offset > dma_bytes - size)
3282 return -EINVAL;
3283
3284 area->vm_ops = &snd_pcm_vm_ops_data;
3285 area->vm_private_data = substream;
3286 if (substream->ops->mmap)
3287 err = substream->ops->mmap(substream, area);
3288 else
3289 err = snd_pcm_lib_default_mmap(substream, area);
3290 if (!err)
3291 atomic_inc(&substream->mmap_count);
3292 return err;
3293 }
3294
3295 EXPORT_SYMBOL(snd_pcm_mmap_data);
3296
3297 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3298 {
3299 struct snd_pcm_file * pcm_file;
3300 struct snd_pcm_substream *substream;
3301 unsigned long offset;
3302
3303 pcm_file = file->private_data;
3304 substream = pcm_file->substream;
3305 if (PCM_RUNTIME_CHECK(substream))
3306 return -ENXIO;
3307
3308 offset = area->vm_pgoff << PAGE_SHIFT;
3309 switch (offset) {
3310 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3311 if (pcm_file->no_compat_mmap)
3312 return -ENXIO;
3313 return snd_pcm_mmap_status(substream, file, area);
3314 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3315 if (pcm_file->no_compat_mmap)
3316 return -ENXIO;
3317 return snd_pcm_mmap_control(substream, file, area);
3318 default:
3319 return snd_pcm_mmap_data(substream, file, area);
3320 }
3321 return 0;
3322 }
3323
3324 static int snd_pcm_fasync(int fd, struct file * file, int on)
3325 {
3326 struct snd_pcm_file * pcm_file;
3327 struct snd_pcm_substream *substream;
3328 struct snd_pcm_runtime *runtime;
3329
3330 pcm_file = file->private_data;
3331 substream = pcm_file->substream;
3332 if (PCM_RUNTIME_CHECK(substream))
3333 return -ENXIO;
3334 runtime = substream->runtime;
3335 return fasync_helper(fd, file, on, &runtime->fasync);
3336 }
3337
3338 /*
3339 * ioctl32 compat
3340 */
3341 #ifdef CONFIG_COMPAT
3342 #include "pcm_compat.c"
3343 #else
3344 #define snd_pcm_ioctl_compat NULL
3345 #endif
3346
3347 /*
3348 * To be removed helpers to keep binary compatibility
3349 */
3350
3351 #ifdef CONFIG_SND_SUPPORT_OLD_API
3352 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3353 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3354
3355 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3356 struct snd_pcm_hw_params_old *oparams)
3357 {
3358 unsigned int i;
3359
3360 memset(params, 0, sizeof(*params));
3361 params->flags = oparams->flags;
3362 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3363 params->masks[i].bits[0] = oparams->masks[i];
3364 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3365 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3366 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3367 params->info = oparams->info;
3368 params->msbits = oparams->msbits;
3369 params->rate_num = oparams->rate_num;
3370 params->rate_den = oparams->rate_den;
3371 params->fifo_size = oparams->fifo_size;
3372 }
3373
3374 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3375 struct snd_pcm_hw_params *params)
3376 {
3377 unsigned int i;
3378
3379 memset(oparams, 0, sizeof(*oparams));
3380 oparams->flags = params->flags;
3381 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3382 oparams->masks[i] = params->masks[i].bits[0];
3383 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3384 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3385 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3386 oparams->info = params->info;
3387 oparams->msbits = params->msbits;
3388 oparams->rate_num = params->rate_num;
3389 oparams->rate_den = params->rate_den;
3390 oparams->fifo_size = params->fifo_size;
3391 }
3392
3393 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3394 struct snd_pcm_hw_params_old __user * _oparams)
3395 {
3396 struct snd_pcm_hw_params *params;
3397 struct snd_pcm_hw_params_old *oparams = NULL;
3398 int err;
3399
3400 params = kmalloc(sizeof(*params), GFP_KERNEL);
3401 if (!params)
3402 return -ENOMEM;
3403
3404 oparams = memdup_user(_oparams, sizeof(*oparams));
3405 if (IS_ERR(oparams)) {
3406 err = PTR_ERR(oparams);
3407 goto out;
3408 }
3409 snd_pcm_hw_convert_from_old_params(params, oparams);
3410 err = snd_pcm_hw_refine(substream, params);
3411 snd_pcm_hw_convert_to_old_params(oparams, params);
3412 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3413 if (!err)
3414 err = -EFAULT;
3415 }
3416
3417 kfree(oparams);
3418 out:
3419 kfree(params);
3420 return err;
3421 }
3422
3423 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3424 struct snd_pcm_hw_params_old __user * _oparams)
3425 {
3426 struct snd_pcm_hw_params *params;
3427 struct snd_pcm_hw_params_old *oparams = NULL;
3428 int err;
3429
3430 params = kmalloc(sizeof(*params), GFP_KERNEL);
3431 if (!params)
3432 return -ENOMEM;
3433
3434 oparams = memdup_user(_oparams, sizeof(*oparams));
3435 if (IS_ERR(oparams)) {
3436 err = PTR_ERR(oparams);
3437 goto out;
3438 }
3439 snd_pcm_hw_convert_from_old_params(params, oparams);
3440 err = snd_pcm_hw_params(substream, params);
3441 snd_pcm_hw_convert_to_old_params(oparams, params);
3442 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3443 if (!err)
3444 err = -EFAULT;
3445 }
3446
3447 kfree(oparams);
3448 out:
3449 kfree(params);
3450 return err;
3451 }
3452 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3453
3454 #ifndef CONFIG_MMU
3455 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3456 unsigned long addr,
3457 unsigned long len,
3458 unsigned long pgoff,
3459 unsigned long flags)
3460 {
3461 struct snd_pcm_file *pcm_file = file->private_data;
3462 struct snd_pcm_substream *substream = pcm_file->substream;
3463 struct snd_pcm_runtime *runtime = substream->runtime;
3464 unsigned long offset = pgoff << PAGE_SHIFT;
3465
3466 switch (offset) {
3467 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3468 return (unsigned long)runtime->status;
3469 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3470 return (unsigned long)runtime->control;
3471 default:
3472 return (unsigned long)runtime->dma_area + offset;
3473 }
3474 }
3475 #else
3476 # define snd_pcm_get_unmapped_area NULL
3477 #endif
3478
3479 /*
3480 * Register section
3481 */
3482
3483 const struct file_operations snd_pcm_f_ops[2] = {
3484 {
3485 .owner = THIS_MODULE,
3486 .write = snd_pcm_write,
3487 .aio_write = snd_pcm_aio_write,
3488 .open = snd_pcm_playback_open,
3489 .release = snd_pcm_release,
3490 .llseek = no_llseek,
3491 .poll = snd_pcm_playback_poll,
3492 .unlocked_ioctl = snd_pcm_playback_ioctl,
3493 .compat_ioctl = snd_pcm_ioctl_compat,
3494 .mmap = snd_pcm_mmap,
3495 .fasync = snd_pcm_fasync,
3496 .get_unmapped_area = snd_pcm_get_unmapped_area,
3497 },
3498 {
3499 .owner = THIS_MODULE,
3500 .read = snd_pcm_read,
3501 .aio_read = snd_pcm_aio_read,
3502 .open = snd_pcm_capture_open,
3503 .release = snd_pcm_release,
3504 .llseek = no_llseek,
3505 .poll = snd_pcm_capture_poll,
3506 .unlocked_ioctl = snd_pcm_capture_ioctl,
3507 .compat_ioctl = snd_pcm_ioctl_compat,
3508 .mmap = snd_pcm_mmap,
3509 .fasync = snd_pcm_fasync,
3510 .get_unmapped_area = snd_pcm_get_unmapped_area,
3511 }
3512 };
3513
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