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/io.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 <linux/uio.h>
38
39 /*
40 * Compatibility
41 */
42
43 struct snd_pcm_hw_params_old {
44 unsigned int flags;
45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
46 SNDRV_PCM_HW_PARAM_ACCESS + 1];
47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
49 unsigned int rmask;
50 unsigned int cmask;
51 unsigned int info;
52 unsigned int msbits;
53 unsigned int rate_num;
54 unsigned int rate_den;
55 snd_pcm_uframes_t fifo_size;
56 unsigned char reserved[64];
57 };
58
59 #ifdef CONFIG_SND_SUPPORT_OLD_API
60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
62
63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params_old __user * _oparams);
65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67 #endif
68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
69
70 /*
71 *
72 */
73
74 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77 /* Writer in rwsem may block readers even during its waiting in queue,
78 * and this may lead to a deadlock when the code path takes read sem
79 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
80 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to
81 * spin until it gets the lock.
82 */
down_write_nonblock(struct rw_semaphore * lock)83 static inline void down_write_nonblock(struct rw_semaphore *lock)
84 {
85 while (!down_write_trylock(lock))
86 cond_resched();
87 }
88
89 /**
90 * snd_pcm_stream_lock - Lock the PCM stream
91 * @substream: PCM substream
92 *
93 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
94 * flag of the given substream. This also takes the global link rw lock
95 * (or rw sem), too, for avoiding the race with linked streams.
96 */
snd_pcm_stream_lock(struct snd_pcm_substream * substream)97 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
98 {
99 if (substream->pcm->nonatomic) {
100 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
101 mutex_lock(&substream->self_group.mutex);
102 } else {
103 read_lock(&snd_pcm_link_rwlock);
104 spin_lock(&substream->self_group.lock);
105 }
106 }
107 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
108
109 /**
110 * snd_pcm_stream_lock - Unlock the PCM stream
111 * @substream: PCM substream
112 *
113 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
114 */
snd_pcm_stream_unlock(struct snd_pcm_substream * substream)115 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
116 {
117 if (substream->pcm->nonatomic) {
118 mutex_unlock(&substream->self_group.mutex);
119 up_read(&snd_pcm_link_rwsem);
120 } else {
121 spin_unlock(&substream->self_group.lock);
122 read_unlock(&snd_pcm_link_rwlock);
123 }
124 }
125 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
126
127 /**
128 * snd_pcm_stream_lock_irq - Lock the PCM stream
129 * @substream: PCM substream
130 *
131 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
132 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
133 * as snd_pcm_stream_lock().
134 */
snd_pcm_stream_lock_irq(struct snd_pcm_substream * substream)135 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
136 {
137 if (!substream->pcm->nonatomic)
138 local_irq_disable();
139 snd_pcm_stream_lock(substream);
140 }
141 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
142
143 /**
144 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
145 * @substream: PCM substream
146 *
147 * This is a counter-part of snd_pcm_stream_lock_irq().
148 */
snd_pcm_stream_unlock_irq(struct snd_pcm_substream * substream)149 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
150 {
151 snd_pcm_stream_unlock(substream);
152 if (!substream->pcm->nonatomic)
153 local_irq_enable();
154 }
155 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
156
_snd_pcm_stream_lock_irqsave(struct snd_pcm_substream * substream)157 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
158 {
159 unsigned long flags = 0;
160 if (!substream->pcm->nonatomic)
161 local_irq_save(flags);
162 snd_pcm_stream_lock(substream);
163 return flags;
164 }
165 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
166
167 /**
168 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
169 * @substream: PCM substream
170 * @flags: irq flags
171 *
172 * This is a counter-part of snd_pcm_stream_lock_irqsave().
173 */
snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream * substream,unsigned long flags)174 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
175 unsigned long flags)
176 {
177 snd_pcm_stream_unlock(substream);
178 if (!substream->pcm->nonatomic)
179 local_irq_restore(flags);
180 }
181 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
182
snd_enter_user(void)183 static inline mm_segment_t snd_enter_user(void)
184 {
185 mm_segment_t fs = get_fs();
186 set_fs(get_ds());
187 return fs;
188 }
189
snd_leave_user(mm_segment_t fs)190 static inline void snd_leave_user(mm_segment_t fs)
191 {
192 set_fs(fs);
193 }
194
195
196
snd_pcm_info(struct snd_pcm_substream * substream,struct snd_pcm_info * info)197 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
198 {
199 struct snd_pcm_runtime *runtime;
200 struct snd_pcm *pcm = substream->pcm;
201 struct snd_pcm_str *pstr = substream->pstr;
202
203 memset(info, 0, sizeof(*info));
204 info->card = pcm->card->number;
205 info->device = pcm->device;
206 info->stream = substream->stream;
207 info->subdevice = substream->number;
208 strlcpy(info->id, pcm->id, sizeof(info->id));
209 strlcpy(info->name, pcm->name, sizeof(info->name));
210 info->dev_class = pcm->dev_class;
211 info->dev_subclass = pcm->dev_subclass;
212 info->subdevices_count = pstr->substream_count;
213 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
214 strlcpy(info->subname, substream->name, sizeof(info->subname));
215 runtime = substream->runtime;
216 /* AB: FIXME!!! This is definitely nonsense */
217 if (runtime) {
218 info->sync = runtime->sync;
219 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
220 }
221 return 0;
222 }
223
snd_pcm_info_user(struct snd_pcm_substream * substream,struct snd_pcm_info __user * _info)224 int snd_pcm_info_user(struct snd_pcm_substream *substream,
225 struct snd_pcm_info __user * _info)
226 {
227 struct snd_pcm_info *info;
228 int err;
229
230 info = kmalloc(sizeof(*info), GFP_KERNEL);
231 if (! info)
232 return -ENOMEM;
233 err = snd_pcm_info(substream, info);
234 if (err >= 0) {
235 if (copy_to_user(_info, info, sizeof(*info)))
236 err = -EFAULT;
237 }
238 kfree(info);
239 return err;
240 }
241
hw_support_mmap(struct snd_pcm_substream * substream)242 static bool hw_support_mmap(struct snd_pcm_substream *substream)
243 {
244 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
245 return false;
246 /* check architectures that return -EINVAL from dma_mmap_coherent() */
247 /* FIXME: this should be some global flag */
248 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
249 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
250 if (!substream->ops->mmap &&
251 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
252 return false;
253 #endif
254 return true;
255 }
256
257 #undef RULES_DEBUG
258
259 #ifdef RULES_DEBUG
260 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
261 static const char * const snd_pcm_hw_param_names[] = {
262 HW_PARAM(ACCESS),
263 HW_PARAM(FORMAT),
264 HW_PARAM(SUBFORMAT),
265 HW_PARAM(SAMPLE_BITS),
266 HW_PARAM(FRAME_BITS),
267 HW_PARAM(CHANNELS),
268 HW_PARAM(RATE),
269 HW_PARAM(PERIOD_TIME),
270 HW_PARAM(PERIOD_SIZE),
271 HW_PARAM(PERIOD_BYTES),
272 HW_PARAM(PERIODS),
273 HW_PARAM(BUFFER_TIME),
274 HW_PARAM(BUFFER_SIZE),
275 HW_PARAM(BUFFER_BYTES),
276 HW_PARAM(TICK_TIME),
277 };
278 #endif
279
snd_pcm_hw_refine(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)280 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
281 struct snd_pcm_hw_params *params)
282 {
283 unsigned int k;
284 struct snd_pcm_hardware *hw;
285 struct snd_interval *i = NULL;
286 struct snd_mask *m = NULL;
287 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
288 unsigned int rstamps[constrs->rules_num];
289 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
290 unsigned int stamp = 2;
291 int changed, again;
292
293 params->info = 0;
294 params->fifo_size = 0;
295 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
296 params->msbits = 0;
297 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
298 params->rate_num = 0;
299 params->rate_den = 0;
300 }
301
302 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
303 m = hw_param_mask(params, k);
304 if (snd_mask_empty(m))
305 return -EINVAL;
306 if (!(params->rmask & (1 << k)))
307 continue;
308 #ifdef RULES_DEBUG
309 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
310 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
311 #endif
312 changed = snd_mask_refine(m, constrs_mask(constrs, k));
313 #ifdef RULES_DEBUG
314 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
315 #endif
316 if (changed)
317 params->cmask |= 1 << k;
318 if (changed < 0)
319 return changed;
320 }
321
322 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
323 i = hw_param_interval(params, k);
324 if (snd_interval_empty(i))
325 return -EINVAL;
326 if (!(params->rmask & (1 << k)))
327 continue;
328 #ifdef RULES_DEBUG
329 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
330 if (i->empty)
331 pr_cont("empty");
332 else
333 pr_cont("%c%u %u%c",
334 i->openmin ? '(' : '[', i->min,
335 i->max, i->openmax ? ')' : ']');
336 pr_cont(" -> ");
337 #endif
338 changed = snd_interval_refine(i, constrs_interval(constrs, k));
339 #ifdef RULES_DEBUG
340 if (i->empty)
341 pr_cont("empty\n");
342 else
343 pr_cont("%c%u %u%c\n",
344 i->openmin ? '(' : '[', i->min,
345 i->max, i->openmax ? ')' : ']');
346 #endif
347 if (changed)
348 params->cmask |= 1 << k;
349 if (changed < 0)
350 return changed;
351 }
352
353 for (k = 0; k < constrs->rules_num; k++)
354 rstamps[k] = 0;
355 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
356 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
357 do {
358 again = 0;
359 for (k = 0; k < constrs->rules_num; k++) {
360 struct snd_pcm_hw_rule *r = &constrs->rules[k];
361 unsigned int d;
362 int doit = 0;
363 if (r->cond && !(r->cond & params->flags))
364 continue;
365 for (d = 0; r->deps[d] >= 0; d++) {
366 if (vstamps[r->deps[d]] > rstamps[k]) {
367 doit = 1;
368 break;
369 }
370 }
371 if (!doit)
372 continue;
373 #ifdef RULES_DEBUG
374 pr_debug("Rule %d [%p]: ", k, r->func);
375 if (r->var >= 0) {
376 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
377 if (hw_is_mask(r->var)) {
378 m = hw_param_mask(params, r->var);
379 pr_cont("%x", *m->bits);
380 } else {
381 i = hw_param_interval(params, r->var);
382 if (i->empty)
383 pr_cont("empty");
384 else
385 pr_cont("%c%u %u%c",
386 i->openmin ? '(' : '[', i->min,
387 i->max, i->openmax ? ')' : ']');
388 }
389 }
390 #endif
391 changed = r->func(params, r);
392 #ifdef RULES_DEBUG
393 if (r->var >= 0) {
394 pr_cont(" -> ");
395 if (hw_is_mask(r->var))
396 pr_cont("%x", *m->bits);
397 else {
398 if (i->empty)
399 pr_cont("empty");
400 else
401 pr_cont("%c%u %u%c",
402 i->openmin ? '(' : '[', i->min,
403 i->max, i->openmax ? ')' : ']');
404 }
405 }
406 pr_cont("\n");
407 #endif
408 rstamps[k] = stamp;
409 if (changed && r->var >= 0) {
410 params->cmask |= (1 << r->var);
411 vstamps[r->var] = stamp;
412 again = 1;
413 }
414 if (changed < 0)
415 return changed;
416 stamp++;
417 }
418 } while (again);
419 if (!params->msbits) {
420 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
421 if (snd_interval_single(i))
422 params->msbits = snd_interval_value(i);
423 }
424
425 if (!params->rate_den) {
426 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
427 if (snd_interval_single(i)) {
428 params->rate_num = snd_interval_value(i);
429 params->rate_den = 1;
430 }
431 }
432
433 hw = &substream->runtime->hw;
434 if (!params->info) {
435 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
436 SNDRV_PCM_INFO_DRAIN_TRIGGER);
437 if (!hw_support_mmap(substream))
438 params->info &= ~(SNDRV_PCM_INFO_MMAP |
439 SNDRV_PCM_INFO_MMAP_VALID);
440 }
441 if (!params->fifo_size) {
442 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
443 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
444 if (snd_mask_min(m) == snd_mask_max(m) &&
445 snd_interval_min(i) == snd_interval_max(i)) {
446 changed = substream->ops->ioctl(substream,
447 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
448 if (changed < 0)
449 return changed;
450 }
451 }
452 params->rmask = 0;
453 return 0;
454 }
455
456 EXPORT_SYMBOL(snd_pcm_hw_refine);
457
snd_pcm_hw_refine_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)458 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
459 struct snd_pcm_hw_params __user * _params)
460 {
461 struct snd_pcm_hw_params *params;
462 int err;
463
464 params = memdup_user(_params, sizeof(*params));
465 if (IS_ERR(params))
466 return PTR_ERR(params);
467
468 err = snd_pcm_hw_refine(substream, params);
469 if (copy_to_user(_params, params, sizeof(*params))) {
470 if (!err)
471 err = -EFAULT;
472 }
473
474 kfree(params);
475 return err;
476 }
477
period_to_usecs(struct snd_pcm_runtime * runtime)478 static int period_to_usecs(struct snd_pcm_runtime *runtime)
479 {
480 int usecs;
481
482 if (! runtime->rate)
483 return -1; /* invalid */
484
485 /* take 75% of period time as the deadline */
486 usecs = (750000 / runtime->rate) * runtime->period_size;
487 usecs += ((750000 % runtime->rate) * runtime->period_size) /
488 runtime->rate;
489
490 return usecs;
491 }
492
snd_pcm_set_state(struct snd_pcm_substream * substream,int state)493 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
494 {
495 snd_pcm_stream_lock_irq(substream);
496 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
497 substream->runtime->status->state = state;
498 snd_pcm_stream_unlock_irq(substream);
499 }
500
snd_pcm_timer_notify(struct snd_pcm_substream * substream,int event)501 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
502 int event)
503 {
504 #ifdef CONFIG_SND_PCM_TIMER
505 if (substream->timer)
506 snd_timer_notify(substream->timer, event,
507 &substream->runtime->trigger_tstamp);
508 #endif
509 }
510
snd_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)511 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
512 struct snd_pcm_hw_params *params)
513 {
514 struct snd_pcm_runtime *runtime;
515 int err, usecs;
516 unsigned int bits;
517 snd_pcm_uframes_t frames;
518
519 if (PCM_RUNTIME_CHECK(substream))
520 return -ENXIO;
521 runtime = substream->runtime;
522 snd_pcm_stream_lock_irq(substream);
523 switch (runtime->status->state) {
524 case SNDRV_PCM_STATE_OPEN:
525 case SNDRV_PCM_STATE_SETUP:
526 case SNDRV_PCM_STATE_PREPARED:
527 break;
528 default:
529 snd_pcm_stream_unlock_irq(substream);
530 return -EBADFD;
531 }
532 snd_pcm_stream_unlock_irq(substream);
533 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
534 if (!substream->oss.oss)
535 #endif
536 if (atomic_read(&substream->mmap_count))
537 return -EBADFD;
538
539 params->rmask = ~0U;
540 err = snd_pcm_hw_refine(substream, params);
541 if (err < 0)
542 goto _error;
543
544 err = snd_pcm_hw_params_choose(substream, params);
545 if (err < 0)
546 goto _error;
547
548 if (substream->ops->hw_params != NULL) {
549 err = substream->ops->hw_params(substream, params);
550 if (err < 0)
551 goto _error;
552 }
553
554 runtime->access = params_access(params);
555 runtime->format = params_format(params);
556 runtime->subformat = params_subformat(params);
557 runtime->channels = params_channels(params);
558 runtime->rate = params_rate(params);
559 runtime->period_size = params_period_size(params);
560 runtime->periods = params_periods(params);
561 runtime->buffer_size = params_buffer_size(params);
562 runtime->info = params->info;
563 runtime->rate_num = params->rate_num;
564 runtime->rate_den = params->rate_den;
565 runtime->no_period_wakeup =
566 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
567 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
568
569 bits = snd_pcm_format_physical_width(runtime->format);
570 runtime->sample_bits = bits;
571 bits *= runtime->channels;
572 runtime->frame_bits = bits;
573 frames = 1;
574 while (bits % 8 != 0) {
575 bits *= 2;
576 frames *= 2;
577 }
578 runtime->byte_align = bits / 8;
579 runtime->min_align = frames;
580
581 /* Default sw params */
582 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
583 runtime->period_step = 1;
584 runtime->control->avail_min = runtime->period_size;
585 runtime->start_threshold = 1;
586 runtime->stop_threshold = runtime->buffer_size;
587 runtime->silence_threshold = 0;
588 runtime->silence_size = 0;
589 runtime->boundary = runtime->buffer_size;
590 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
591 runtime->boundary *= 2;
592
593 snd_pcm_timer_resolution_change(substream);
594 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
595
596 if (pm_qos_request_active(&substream->latency_pm_qos_req))
597 pm_qos_remove_request(&substream->latency_pm_qos_req);
598 if ((usecs = period_to_usecs(runtime)) >= 0)
599 pm_qos_add_request(&substream->latency_pm_qos_req,
600 PM_QOS_CPU_DMA_LATENCY, usecs);
601 return 0;
602 _error:
603 /* hardware might be unusable from this time,
604 so we force application to retry to set
605 the correct hardware parameter settings */
606 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
607 if (substream->ops->hw_free != NULL)
608 substream->ops->hw_free(substream);
609 return err;
610 }
611
snd_pcm_hw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)612 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
613 struct snd_pcm_hw_params __user * _params)
614 {
615 struct snd_pcm_hw_params *params;
616 int err;
617
618 params = memdup_user(_params, sizeof(*params));
619 if (IS_ERR(params))
620 return PTR_ERR(params);
621
622 err = snd_pcm_hw_params(substream, params);
623 if (copy_to_user(_params, params, sizeof(*params))) {
624 if (!err)
625 err = -EFAULT;
626 }
627
628 kfree(params);
629 return err;
630 }
631
snd_pcm_hw_free(struct snd_pcm_substream * substream)632 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
633 {
634 struct snd_pcm_runtime *runtime;
635 int result = 0;
636
637 if (PCM_RUNTIME_CHECK(substream))
638 return -ENXIO;
639 runtime = substream->runtime;
640 snd_pcm_stream_lock_irq(substream);
641 switch (runtime->status->state) {
642 case SNDRV_PCM_STATE_SETUP:
643 case SNDRV_PCM_STATE_PREPARED:
644 break;
645 default:
646 snd_pcm_stream_unlock_irq(substream);
647 return -EBADFD;
648 }
649 snd_pcm_stream_unlock_irq(substream);
650 if (atomic_read(&substream->mmap_count))
651 return -EBADFD;
652 if (substream->ops->hw_free)
653 result = substream->ops->hw_free(substream);
654 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
655 pm_qos_remove_request(&substream->latency_pm_qos_req);
656 return result;
657 }
658
snd_pcm_sw_params(struct snd_pcm_substream * substream,struct snd_pcm_sw_params * params)659 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
660 struct snd_pcm_sw_params *params)
661 {
662 struct snd_pcm_runtime *runtime;
663 int err;
664
665 if (PCM_RUNTIME_CHECK(substream))
666 return -ENXIO;
667 runtime = substream->runtime;
668 snd_pcm_stream_lock_irq(substream);
669 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
670 snd_pcm_stream_unlock_irq(substream);
671 return -EBADFD;
672 }
673 snd_pcm_stream_unlock_irq(substream);
674
675 if (params->tstamp_mode < 0 ||
676 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
677 return -EINVAL;
678 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
679 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
680 return -EINVAL;
681 if (params->avail_min == 0)
682 return -EINVAL;
683 if (params->silence_size >= runtime->boundary) {
684 if (params->silence_threshold != 0)
685 return -EINVAL;
686 } else {
687 if (params->silence_size > params->silence_threshold)
688 return -EINVAL;
689 if (params->silence_threshold > runtime->buffer_size)
690 return -EINVAL;
691 }
692 err = 0;
693 snd_pcm_stream_lock_irq(substream);
694 runtime->tstamp_mode = params->tstamp_mode;
695 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
696 runtime->tstamp_type = params->tstamp_type;
697 runtime->period_step = params->period_step;
698 runtime->control->avail_min = params->avail_min;
699 runtime->start_threshold = params->start_threshold;
700 runtime->stop_threshold = params->stop_threshold;
701 runtime->silence_threshold = params->silence_threshold;
702 runtime->silence_size = params->silence_size;
703 params->boundary = runtime->boundary;
704 if (snd_pcm_running(substream)) {
705 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
706 runtime->silence_size > 0)
707 snd_pcm_playback_silence(substream, ULONG_MAX);
708 err = snd_pcm_update_state(substream, runtime);
709 }
710 snd_pcm_stream_unlock_irq(substream);
711 return err;
712 }
713
snd_pcm_sw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_sw_params __user * _params)714 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
715 struct snd_pcm_sw_params __user * _params)
716 {
717 struct snd_pcm_sw_params params;
718 int err;
719 if (copy_from_user(¶ms, _params, sizeof(params)))
720 return -EFAULT;
721 err = snd_pcm_sw_params(substream, ¶ms);
722 if (copy_to_user(_params, ¶ms, sizeof(params)))
723 return -EFAULT;
724 return err;
725 }
726
snd_pcm_status(struct snd_pcm_substream * substream,struct snd_pcm_status * status)727 int snd_pcm_status(struct snd_pcm_substream *substream,
728 struct snd_pcm_status *status)
729 {
730 struct snd_pcm_runtime *runtime = substream->runtime;
731
732 snd_pcm_stream_lock_irq(substream);
733
734 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
735 &runtime->audio_tstamp_config);
736
737 /* backwards compatible behavior */
738 if (runtime->audio_tstamp_config.type_requested ==
739 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
740 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
741 runtime->audio_tstamp_config.type_requested =
742 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
743 else
744 runtime->audio_tstamp_config.type_requested =
745 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
746 runtime->audio_tstamp_report.valid = 0;
747 } else
748 runtime->audio_tstamp_report.valid = 1;
749
750 status->state = runtime->status->state;
751 status->suspended_state = runtime->status->suspended_state;
752 if (status->state == SNDRV_PCM_STATE_OPEN)
753 goto _end;
754 status->trigger_tstamp = runtime->trigger_tstamp;
755 if (snd_pcm_running(substream)) {
756 snd_pcm_update_hw_ptr(substream);
757 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
758 status->tstamp = runtime->status->tstamp;
759 status->driver_tstamp = runtime->driver_tstamp;
760 status->audio_tstamp =
761 runtime->status->audio_tstamp;
762 if (runtime->audio_tstamp_report.valid == 1)
763 /* backwards compatibility, no report provided in COMPAT mode */
764 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
765 &status->audio_tstamp_accuracy,
766 &runtime->audio_tstamp_report);
767
768 goto _tstamp_end;
769 }
770 } else {
771 /* get tstamp only in fallback mode and only if enabled */
772 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
773 snd_pcm_gettime(runtime, &status->tstamp);
774 }
775 _tstamp_end:
776 status->appl_ptr = runtime->control->appl_ptr;
777 status->hw_ptr = runtime->status->hw_ptr;
778 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
779 status->avail = snd_pcm_playback_avail(runtime);
780 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
781 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
782 status->delay = runtime->buffer_size - status->avail;
783 status->delay += runtime->delay;
784 } else
785 status->delay = 0;
786 } else {
787 status->avail = snd_pcm_capture_avail(runtime);
788 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
789 status->delay = status->avail + runtime->delay;
790 else
791 status->delay = 0;
792 }
793 status->avail_max = runtime->avail_max;
794 status->overrange = runtime->overrange;
795 runtime->avail_max = 0;
796 runtime->overrange = 0;
797 _end:
798 snd_pcm_stream_unlock_irq(substream);
799 return 0;
800 }
801
snd_pcm_status_user(struct snd_pcm_substream * substream,struct snd_pcm_status __user * _status,bool ext)802 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
803 struct snd_pcm_status __user * _status,
804 bool ext)
805 {
806 struct snd_pcm_status status;
807 int res;
808
809 memset(&status, 0, sizeof(status));
810 /*
811 * with extension, parameters are read/write,
812 * get audio_tstamp_data from user,
813 * ignore rest of status structure
814 */
815 if (ext && get_user(status.audio_tstamp_data,
816 (u32 __user *)(&_status->audio_tstamp_data)))
817 return -EFAULT;
818 res = snd_pcm_status(substream, &status);
819 if (res < 0)
820 return res;
821 if (copy_to_user(_status, &status, sizeof(status)))
822 return -EFAULT;
823 return 0;
824 }
825
snd_pcm_channel_info(struct snd_pcm_substream * substream,struct snd_pcm_channel_info * info)826 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
827 struct snd_pcm_channel_info * info)
828 {
829 struct snd_pcm_runtime *runtime;
830 unsigned int channel;
831
832 channel = info->channel;
833 runtime = substream->runtime;
834 snd_pcm_stream_lock_irq(substream);
835 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
836 snd_pcm_stream_unlock_irq(substream);
837 return -EBADFD;
838 }
839 snd_pcm_stream_unlock_irq(substream);
840 if (channel >= runtime->channels)
841 return -EINVAL;
842 memset(info, 0, sizeof(*info));
843 info->channel = channel;
844 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
845 }
846
snd_pcm_channel_info_user(struct snd_pcm_substream * substream,struct snd_pcm_channel_info __user * _info)847 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
848 struct snd_pcm_channel_info __user * _info)
849 {
850 struct snd_pcm_channel_info info;
851 int res;
852
853 if (copy_from_user(&info, _info, sizeof(info)))
854 return -EFAULT;
855 res = snd_pcm_channel_info(substream, &info);
856 if (res < 0)
857 return res;
858 if (copy_to_user(_info, &info, sizeof(info)))
859 return -EFAULT;
860 return 0;
861 }
862
snd_pcm_trigger_tstamp(struct snd_pcm_substream * substream)863 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
864 {
865 struct snd_pcm_runtime *runtime = substream->runtime;
866 if (runtime->trigger_master == NULL)
867 return;
868 if (runtime->trigger_master == substream) {
869 if (!runtime->trigger_tstamp_latched)
870 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
871 } else {
872 snd_pcm_trigger_tstamp(runtime->trigger_master);
873 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
874 }
875 runtime->trigger_master = NULL;
876 }
877
878 struct action_ops {
879 int (*pre_action)(struct snd_pcm_substream *substream, int state);
880 int (*do_action)(struct snd_pcm_substream *substream, int state);
881 void (*undo_action)(struct snd_pcm_substream *substream, int state);
882 void (*post_action)(struct snd_pcm_substream *substream, int state);
883 };
884
885 /*
886 * this functions is core for handling of linked stream
887 * Note: the stream state might be changed also on failure
888 * Note2: call with calling stream lock + link lock
889 */
snd_pcm_action_group(const struct action_ops * ops,struct snd_pcm_substream * substream,int state,int do_lock)890 static int snd_pcm_action_group(const struct action_ops *ops,
891 struct snd_pcm_substream *substream,
892 int state, int do_lock)
893 {
894 struct snd_pcm_substream *s = NULL;
895 struct snd_pcm_substream *s1;
896 int res = 0, depth = 1;
897
898 snd_pcm_group_for_each_entry(s, substream) {
899 if (do_lock && s != substream) {
900 if (s->pcm->nonatomic)
901 mutex_lock_nested(&s->self_group.mutex, depth);
902 else
903 spin_lock_nested(&s->self_group.lock, depth);
904 depth++;
905 }
906 res = ops->pre_action(s, state);
907 if (res < 0)
908 goto _unlock;
909 }
910 snd_pcm_group_for_each_entry(s, substream) {
911 res = ops->do_action(s, state);
912 if (res < 0) {
913 if (ops->undo_action) {
914 snd_pcm_group_for_each_entry(s1, substream) {
915 if (s1 == s) /* failed stream */
916 break;
917 ops->undo_action(s1, state);
918 }
919 }
920 s = NULL; /* unlock all */
921 goto _unlock;
922 }
923 }
924 snd_pcm_group_for_each_entry(s, substream) {
925 ops->post_action(s, state);
926 }
927 _unlock:
928 if (do_lock) {
929 /* unlock streams */
930 snd_pcm_group_for_each_entry(s1, substream) {
931 if (s1 != substream) {
932 if (s1->pcm->nonatomic)
933 mutex_unlock(&s1->self_group.mutex);
934 else
935 spin_unlock(&s1->self_group.lock);
936 }
937 if (s1 == s) /* end */
938 break;
939 }
940 }
941 return res;
942 }
943
944 /*
945 * Note: call with stream lock
946 */
snd_pcm_action_single(const struct action_ops * ops,struct snd_pcm_substream * substream,int state)947 static int snd_pcm_action_single(const struct action_ops *ops,
948 struct snd_pcm_substream *substream,
949 int state)
950 {
951 int res;
952
953 res = ops->pre_action(substream, state);
954 if (res < 0)
955 return res;
956 res = ops->do_action(substream, state);
957 if (res == 0)
958 ops->post_action(substream, state);
959 else if (ops->undo_action)
960 ops->undo_action(substream, state);
961 return res;
962 }
963
964 /*
965 * Note: call with stream lock
966 */
snd_pcm_action(const struct action_ops * ops,struct snd_pcm_substream * substream,int state)967 static int snd_pcm_action(const struct action_ops *ops,
968 struct snd_pcm_substream *substream,
969 int state)
970 {
971 int res;
972
973 if (!snd_pcm_stream_linked(substream))
974 return snd_pcm_action_single(ops, substream, state);
975
976 if (substream->pcm->nonatomic) {
977 if (!mutex_trylock(&substream->group->mutex)) {
978 mutex_unlock(&substream->self_group.mutex);
979 mutex_lock(&substream->group->mutex);
980 mutex_lock(&substream->self_group.mutex);
981 }
982 res = snd_pcm_action_group(ops, substream, state, 1);
983 mutex_unlock(&substream->group->mutex);
984 } else {
985 if (!spin_trylock(&substream->group->lock)) {
986 spin_unlock(&substream->self_group.lock);
987 spin_lock(&substream->group->lock);
988 spin_lock(&substream->self_group.lock);
989 }
990 res = snd_pcm_action_group(ops, substream, state, 1);
991 spin_unlock(&substream->group->lock);
992 }
993 return res;
994 }
995
996 /*
997 * Note: don't use any locks before
998 */
snd_pcm_action_lock_irq(const struct action_ops * ops,struct snd_pcm_substream * substream,int state)999 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1000 struct snd_pcm_substream *substream,
1001 int state)
1002 {
1003 int res;
1004
1005 snd_pcm_stream_lock_irq(substream);
1006 res = snd_pcm_action(ops, substream, state);
1007 snd_pcm_stream_unlock_irq(substream);
1008 return res;
1009 }
1010
1011 /*
1012 */
snd_pcm_action_nonatomic(const struct action_ops * ops,struct snd_pcm_substream * substream,int state)1013 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1014 struct snd_pcm_substream *substream,
1015 int state)
1016 {
1017 int res;
1018
1019 down_read(&snd_pcm_link_rwsem);
1020 if (snd_pcm_stream_linked(substream))
1021 res = snd_pcm_action_group(ops, substream, state, 0);
1022 else
1023 res = snd_pcm_action_single(ops, substream, state);
1024 up_read(&snd_pcm_link_rwsem);
1025 return res;
1026 }
1027
1028 /*
1029 * start callbacks
1030 */
snd_pcm_pre_start(struct snd_pcm_substream * substream,int state)1031 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1032 {
1033 struct snd_pcm_runtime *runtime = substream->runtime;
1034 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1035 return -EBADFD;
1036 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1037 !snd_pcm_playback_data(substream))
1038 return -EPIPE;
1039 runtime->trigger_tstamp_latched = false;
1040 runtime->trigger_master = substream;
1041 return 0;
1042 }
1043
snd_pcm_do_start(struct snd_pcm_substream * substream,int state)1044 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1045 {
1046 if (substream->runtime->trigger_master != substream)
1047 return 0;
1048 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1049 }
1050
snd_pcm_undo_start(struct snd_pcm_substream * substream,int state)1051 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1052 {
1053 if (substream->runtime->trigger_master == substream)
1054 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1055 }
1056
snd_pcm_post_start(struct snd_pcm_substream * substream,int state)1057 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1058 {
1059 struct snd_pcm_runtime *runtime = substream->runtime;
1060 snd_pcm_trigger_tstamp(substream);
1061 runtime->hw_ptr_jiffies = jiffies;
1062 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1063 runtime->rate;
1064 runtime->status->state = state;
1065 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1066 runtime->silence_size > 0)
1067 snd_pcm_playback_silence(substream, ULONG_MAX);
1068 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1069 }
1070
1071 static const struct action_ops snd_pcm_action_start = {
1072 .pre_action = snd_pcm_pre_start,
1073 .do_action = snd_pcm_do_start,
1074 .undo_action = snd_pcm_undo_start,
1075 .post_action = snd_pcm_post_start
1076 };
1077
1078 /**
1079 * snd_pcm_start - start all linked streams
1080 * @substream: the PCM substream instance
1081 *
1082 * Return: Zero if successful, or a negative error code.
1083 */
snd_pcm_start(struct snd_pcm_substream * substream)1084 int snd_pcm_start(struct snd_pcm_substream *substream)
1085 {
1086 return snd_pcm_action(&snd_pcm_action_start, substream,
1087 SNDRV_PCM_STATE_RUNNING);
1088 }
1089
1090 /*
1091 * stop callbacks
1092 */
snd_pcm_pre_stop(struct snd_pcm_substream * substream,int state)1093 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1094 {
1095 struct snd_pcm_runtime *runtime = substream->runtime;
1096 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1097 return -EBADFD;
1098 runtime->trigger_master = substream;
1099 return 0;
1100 }
1101
snd_pcm_do_stop(struct snd_pcm_substream * substream,int state)1102 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1103 {
1104 if (substream->runtime->trigger_master == substream &&
1105 snd_pcm_running(substream))
1106 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1107 return 0; /* unconditonally stop all substreams */
1108 }
1109
snd_pcm_post_stop(struct snd_pcm_substream * substream,int state)1110 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1111 {
1112 struct snd_pcm_runtime *runtime = substream->runtime;
1113 if (runtime->status->state != state) {
1114 snd_pcm_trigger_tstamp(substream);
1115 runtime->status->state = state;
1116 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1117 }
1118 wake_up(&runtime->sleep);
1119 wake_up(&runtime->tsleep);
1120 }
1121
1122 static const struct action_ops snd_pcm_action_stop = {
1123 .pre_action = snd_pcm_pre_stop,
1124 .do_action = snd_pcm_do_stop,
1125 .post_action = snd_pcm_post_stop
1126 };
1127
1128 /**
1129 * snd_pcm_stop - try to stop all running streams in the substream group
1130 * @substream: the PCM substream instance
1131 * @state: PCM state after stopping the stream
1132 *
1133 * The state of each stream is then changed to the given state unconditionally.
1134 *
1135 * Return: Zero if successful, or a negative error code.
1136 */
snd_pcm_stop(struct snd_pcm_substream * substream,snd_pcm_state_t state)1137 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1138 {
1139 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1140 }
1141
1142 EXPORT_SYMBOL(snd_pcm_stop);
1143
1144 /**
1145 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1146 * @substream: the PCM substream
1147 *
1148 * After stopping, the state is changed to SETUP.
1149 * Unlike snd_pcm_stop(), this affects only the given stream.
1150 *
1151 * Return: Zero if succesful, or a negative error code.
1152 */
snd_pcm_drain_done(struct snd_pcm_substream * substream)1153 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1154 {
1155 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1156 SNDRV_PCM_STATE_SETUP);
1157 }
1158
1159 /**
1160 * snd_pcm_stop_xrun - stop the running streams as XRUN
1161 * @substream: the PCM substream instance
1162 *
1163 * This stops the given running substream (and all linked substreams) as XRUN.
1164 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1165 *
1166 * Return: Zero if successful, or a negative error code.
1167 */
snd_pcm_stop_xrun(struct snd_pcm_substream * substream)1168 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1169 {
1170 unsigned long flags;
1171 int ret = 0;
1172
1173 snd_pcm_stream_lock_irqsave(substream, flags);
1174 if (snd_pcm_running(substream))
1175 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1176 snd_pcm_stream_unlock_irqrestore(substream, flags);
1177 return ret;
1178 }
1179 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1180
1181 /*
1182 * pause callbacks
1183 */
snd_pcm_pre_pause(struct snd_pcm_substream * substream,int push)1184 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1185 {
1186 struct snd_pcm_runtime *runtime = substream->runtime;
1187 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1188 return -ENOSYS;
1189 if (push) {
1190 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1191 return -EBADFD;
1192 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1193 return -EBADFD;
1194 runtime->trigger_master = substream;
1195 return 0;
1196 }
1197
snd_pcm_do_pause(struct snd_pcm_substream * substream,int push)1198 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1199 {
1200 if (substream->runtime->trigger_master != substream)
1201 return 0;
1202 /* some drivers might use hw_ptr to recover from the pause -
1203 update the hw_ptr now */
1204 if (push)
1205 snd_pcm_update_hw_ptr(substream);
1206 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1207 * a delta between the current jiffies, this gives a large enough
1208 * delta, effectively to skip the check once.
1209 */
1210 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1211 return substream->ops->trigger(substream,
1212 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1213 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1214 }
1215
snd_pcm_undo_pause(struct snd_pcm_substream * substream,int push)1216 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1217 {
1218 if (substream->runtime->trigger_master == substream)
1219 substream->ops->trigger(substream,
1220 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1221 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1222 }
1223
snd_pcm_post_pause(struct snd_pcm_substream * substream,int push)1224 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1225 {
1226 struct snd_pcm_runtime *runtime = substream->runtime;
1227 snd_pcm_trigger_tstamp(substream);
1228 if (push) {
1229 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1230 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1231 wake_up(&runtime->sleep);
1232 wake_up(&runtime->tsleep);
1233 } else {
1234 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1235 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1236 }
1237 }
1238
1239 static const struct action_ops snd_pcm_action_pause = {
1240 .pre_action = snd_pcm_pre_pause,
1241 .do_action = snd_pcm_do_pause,
1242 .undo_action = snd_pcm_undo_pause,
1243 .post_action = snd_pcm_post_pause
1244 };
1245
1246 /*
1247 * Push/release the pause for all linked streams.
1248 */
snd_pcm_pause(struct snd_pcm_substream * substream,int push)1249 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1250 {
1251 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1252 }
1253
1254 #ifdef CONFIG_PM
1255 /* suspend */
1256
snd_pcm_pre_suspend(struct snd_pcm_substream * substream,int state)1257 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1258 {
1259 struct snd_pcm_runtime *runtime = substream->runtime;
1260 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1261 return -EBUSY;
1262 runtime->trigger_master = substream;
1263 return 0;
1264 }
1265
snd_pcm_do_suspend(struct snd_pcm_substream * substream,int state)1266 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1267 {
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 if (runtime->trigger_master != substream)
1270 return 0;
1271 if (! snd_pcm_running(substream))
1272 return 0;
1273 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1274 return 0; /* suspend unconditionally */
1275 }
1276
snd_pcm_post_suspend(struct snd_pcm_substream * substream,int state)1277 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1278 {
1279 struct snd_pcm_runtime *runtime = substream->runtime;
1280 snd_pcm_trigger_tstamp(substream);
1281 runtime->status->suspended_state = runtime->status->state;
1282 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1283 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1284 wake_up(&runtime->sleep);
1285 wake_up(&runtime->tsleep);
1286 }
1287
1288 static const struct action_ops snd_pcm_action_suspend = {
1289 .pre_action = snd_pcm_pre_suspend,
1290 .do_action = snd_pcm_do_suspend,
1291 .post_action = snd_pcm_post_suspend
1292 };
1293
1294 /**
1295 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1296 * @substream: the PCM substream
1297 *
1298 * After this call, all streams are changed to SUSPENDED state.
1299 *
1300 * Return: Zero if successful (or @substream is %NULL), or a negative error
1301 * code.
1302 */
snd_pcm_suspend(struct snd_pcm_substream * substream)1303 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1304 {
1305 int err;
1306 unsigned long flags;
1307
1308 if (! substream)
1309 return 0;
1310
1311 snd_pcm_stream_lock_irqsave(substream, flags);
1312 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1313 snd_pcm_stream_unlock_irqrestore(substream, flags);
1314 return err;
1315 }
1316
1317 EXPORT_SYMBOL(snd_pcm_suspend);
1318
1319 /**
1320 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1321 * @pcm: the PCM instance
1322 *
1323 * After this call, all streams are changed to SUSPENDED state.
1324 *
1325 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1326 */
snd_pcm_suspend_all(struct snd_pcm * pcm)1327 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1328 {
1329 struct snd_pcm_substream *substream;
1330 int stream, err = 0;
1331
1332 if (! pcm)
1333 return 0;
1334
1335 for (stream = 0; stream < 2; stream++) {
1336 for (substream = pcm->streams[stream].substream;
1337 substream; substream = substream->next) {
1338 /* FIXME: the open/close code should lock this as well */
1339 if (substream->runtime == NULL)
1340 continue;
1341 err = snd_pcm_suspend(substream);
1342 if (err < 0 && err != -EBUSY)
1343 return err;
1344 }
1345 }
1346 return 0;
1347 }
1348
1349 EXPORT_SYMBOL(snd_pcm_suspend_all);
1350
1351 /* resume */
1352
snd_pcm_pre_resume(struct snd_pcm_substream * substream,int state)1353 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1354 {
1355 struct snd_pcm_runtime *runtime = substream->runtime;
1356 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1357 return -ENOSYS;
1358 runtime->trigger_master = substream;
1359 return 0;
1360 }
1361
snd_pcm_do_resume(struct snd_pcm_substream * substream,int state)1362 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1363 {
1364 struct snd_pcm_runtime *runtime = substream->runtime;
1365 if (runtime->trigger_master != substream)
1366 return 0;
1367 /* DMA not running previously? */
1368 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1369 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1370 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1371 return 0;
1372 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1373 }
1374
snd_pcm_undo_resume(struct snd_pcm_substream * substream,int state)1375 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1376 {
1377 if (substream->runtime->trigger_master == substream &&
1378 snd_pcm_running(substream))
1379 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1380 }
1381
snd_pcm_post_resume(struct snd_pcm_substream * substream,int state)1382 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1383 {
1384 struct snd_pcm_runtime *runtime = substream->runtime;
1385 snd_pcm_trigger_tstamp(substream);
1386 runtime->status->state = runtime->status->suspended_state;
1387 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1388 }
1389
1390 static const struct action_ops snd_pcm_action_resume = {
1391 .pre_action = snd_pcm_pre_resume,
1392 .do_action = snd_pcm_do_resume,
1393 .undo_action = snd_pcm_undo_resume,
1394 .post_action = snd_pcm_post_resume
1395 };
1396
snd_pcm_resume(struct snd_pcm_substream * substream)1397 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1398 {
1399 struct snd_card *card = substream->pcm->card;
1400 int res;
1401
1402 snd_power_lock(card);
1403 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1404 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1405 snd_power_unlock(card);
1406 return res;
1407 }
1408
1409 #else
1410
snd_pcm_resume(struct snd_pcm_substream * substream)1411 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1412 {
1413 return -ENOSYS;
1414 }
1415
1416 #endif /* CONFIG_PM */
1417
1418 /*
1419 * xrun ioctl
1420 *
1421 * Change the RUNNING stream(s) to XRUN state.
1422 */
snd_pcm_xrun(struct snd_pcm_substream * substream)1423 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1424 {
1425 struct snd_card *card = substream->pcm->card;
1426 struct snd_pcm_runtime *runtime = substream->runtime;
1427 int result;
1428
1429 snd_power_lock(card);
1430 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1431 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1432 if (result < 0)
1433 goto _unlock;
1434 }
1435
1436 snd_pcm_stream_lock_irq(substream);
1437 switch (runtime->status->state) {
1438 case SNDRV_PCM_STATE_XRUN:
1439 result = 0; /* already there */
1440 break;
1441 case SNDRV_PCM_STATE_RUNNING:
1442 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1443 break;
1444 default:
1445 result = -EBADFD;
1446 }
1447 snd_pcm_stream_unlock_irq(substream);
1448 _unlock:
1449 snd_power_unlock(card);
1450 return result;
1451 }
1452
1453 /*
1454 * reset ioctl
1455 */
snd_pcm_pre_reset(struct snd_pcm_substream * substream,int state)1456 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1457 {
1458 struct snd_pcm_runtime *runtime = substream->runtime;
1459 switch (runtime->status->state) {
1460 case SNDRV_PCM_STATE_RUNNING:
1461 case SNDRV_PCM_STATE_PREPARED:
1462 case SNDRV_PCM_STATE_PAUSED:
1463 case SNDRV_PCM_STATE_SUSPENDED:
1464 return 0;
1465 default:
1466 return -EBADFD;
1467 }
1468 }
1469
snd_pcm_do_reset(struct snd_pcm_substream * substream,int state)1470 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1471 {
1472 struct snd_pcm_runtime *runtime = substream->runtime;
1473 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1474 if (err < 0)
1475 return err;
1476 runtime->hw_ptr_base = 0;
1477 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1478 runtime->status->hw_ptr % runtime->period_size;
1479 runtime->silence_start = runtime->status->hw_ptr;
1480 runtime->silence_filled = 0;
1481 return 0;
1482 }
1483
snd_pcm_post_reset(struct snd_pcm_substream * substream,int state)1484 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1485 {
1486 struct snd_pcm_runtime *runtime = substream->runtime;
1487 runtime->control->appl_ptr = runtime->status->hw_ptr;
1488 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1489 runtime->silence_size > 0)
1490 snd_pcm_playback_silence(substream, ULONG_MAX);
1491 }
1492
1493 static const struct action_ops snd_pcm_action_reset = {
1494 .pre_action = snd_pcm_pre_reset,
1495 .do_action = snd_pcm_do_reset,
1496 .post_action = snd_pcm_post_reset
1497 };
1498
snd_pcm_reset(struct snd_pcm_substream * substream)1499 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1500 {
1501 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1502 }
1503
1504 /*
1505 * prepare ioctl
1506 */
1507 /* we use the second argument for updating f_flags */
snd_pcm_pre_prepare(struct snd_pcm_substream * substream,int f_flags)1508 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1509 int f_flags)
1510 {
1511 struct snd_pcm_runtime *runtime = substream->runtime;
1512 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1513 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1514 return -EBADFD;
1515 if (snd_pcm_running(substream))
1516 return -EBUSY;
1517 substream->f_flags = f_flags;
1518 return 0;
1519 }
1520
snd_pcm_do_prepare(struct snd_pcm_substream * substream,int state)1521 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1522 {
1523 int err;
1524 err = substream->ops->prepare(substream);
1525 if (err < 0)
1526 return err;
1527 return snd_pcm_do_reset(substream, 0);
1528 }
1529
snd_pcm_post_prepare(struct snd_pcm_substream * substream,int state)1530 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1531 {
1532 struct snd_pcm_runtime *runtime = substream->runtime;
1533 runtime->control->appl_ptr = runtime->status->hw_ptr;
1534 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1535 }
1536
1537 static const struct action_ops snd_pcm_action_prepare = {
1538 .pre_action = snd_pcm_pre_prepare,
1539 .do_action = snd_pcm_do_prepare,
1540 .post_action = snd_pcm_post_prepare
1541 };
1542
1543 /**
1544 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1545 * @substream: the PCM substream instance
1546 * @file: file to refer f_flags
1547 *
1548 * Return: Zero if successful, or a negative error code.
1549 */
snd_pcm_prepare(struct snd_pcm_substream * substream,struct file * file)1550 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1551 struct file *file)
1552 {
1553 int res;
1554 struct snd_card *card = substream->pcm->card;
1555 int f_flags;
1556
1557 if (file)
1558 f_flags = file->f_flags;
1559 else
1560 f_flags = substream->f_flags;
1561
1562 snd_power_lock(card);
1563 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1564 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1565 substream, f_flags);
1566 snd_power_unlock(card);
1567 return res;
1568 }
1569
1570 /*
1571 * drain ioctl
1572 */
1573
snd_pcm_pre_drain_init(struct snd_pcm_substream * substream,int state)1574 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1575 {
1576 struct snd_pcm_runtime *runtime = substream->runtime;
1577 switch (runtime->status->state) {
1578 case SNDRV_PCM_STATE_OPEN:
1579 case SNDRV_PCM_STATE_DISCONNECTED:
1580 case SNDRV_PCM_STATE_SUSPENDED:
1581 return -EBADFD;
1582 }
1583 runtime->trigger_master = substream;
1584 return 0;
1585 }
1586
snd_pcm_do_drain_init(struct snd_pcm_substream * substream,int state)1587 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1588 {
1589 struct snd_pcm_runtime *runtime = substream->runtime;
1590 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1591 switch (runtime->status->state) {
1592 case SNDRV_PCM_STATE_PREPARED:
1593 /* start playback stream if possible */
1594 if (! snd_pcm_playback_empty(substream)) {
1595 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1596 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1597 } else {
1598 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1599 }
1600 break;
1601 case SNDRV_PCM_STATE_RUNNING:
1602 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1603 break;
1604 case SNDRV_PCM_STATE_XRUN:
1605 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1606 break;
1607 default:
1608 break;
1609 }
1610 } else {
1611 /* stop running stream */
1612 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1613 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1614 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1615 snd_pcm_do_stop(substream, new_state);
1616 snd_pcm_post_stop(substream, new_state);
1617 }
1618 }
1619
1620 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1621 runtime->trigger_master == substream &&
1622 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1623 return substream->ops->trigger(substream,
1624 SNDRV_PCM_TRIGGER_DRAIN);
1625
1626 return 0;
1627 }
1628
snd_pcm_post_drain_init(struct snd_pcm_substream * substream,int state)1629 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1630 {
1631 }
1632
1633 static const struct action_ops snd_pcm_action_drain_init = {
1634 .pre_action = snd_pcm_pre_drain_init,
1635 .do_action = snd_pcm_do_drain_init,
1636 .post_action = snd_pcm_post_drain_init
1637 };
1638
1639 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1640
1641 /*
1642 * Drain the stream(s).
1643 * When the substream is linked, sync until the draining of all playback streams
1644 * is finished.
1645 * After this call, all streams are supposed to be either SETUP or DRAINING
1646 * (capture only) state.
1647 */
snd_pcm_drain(struct snd_pcm_substream * substream,struct file * file)1648 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1649 struct file *file)
1650 {
1651 struct snd_card *card;
1652 struct snd_pcm_runtime *runtime;
1653 struct snd_pcm_substream *s;
1654 wait_queue_t wait;
1655 int result = 0;
1656 int nonblock = 0;
1657
1658 card = substream->pcm->card;
1659 runtime = substream->runtime;
1660
1661 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1662 return -EBADFD;
1663
1664 snd_power_lock(card);
1665 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1666 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1667 if (result < 0) {
1668 snd_power_unlock(card);
1669 return result;
1670 }
1671 }
1672
1673 if (file) {
1674 if (file->f_flags & O_NONBLOCK)
1675 nonblock = 1;
1676 } else if (substream->f_flags & O_NONBLOCK)
1677 nonblock = 1;
1678
1679 down_read(&snd_pcm_link_rwsem);
1680 snd_pcm_stream_lock_irq(substream);
1681 /* resume pause */
1682 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1683 snd_pcm_pause(substream, 0);
1684
1685 /* pre-start/stop - all running streams are changed to DRAINING state */
1686 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1687 if (result < 0)
1688 goto unlock;
1689 /* in non-blocking, we don't wait in ioctl but let caller poll */
1690 if (nonblock) {
1691 result = -EAGAIN;
1692 goto unlock;
1693 }
1694
1695 for (;;) {
1696 long tout;
1697 struct snd_pcm_runtime *to_check;
1698 if (signal_pending(current)) {
1699 result = -ERESTARTSYS;
1700 break;
1701 }
1702 /* find a substream to drain */
1703 to_check = NULL;
1704 snd_pcm_group_for_each_entry(s, substream) {
1705 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1706 continue;
1707 runtime = s->runtime;
1708 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1709 to_check = runtime;
1710 break;
1711 }
1712 }
1713 if (!to_check)
1714 break; /* all drained */
1715 init_waitqueue_entry(&wait, current);
1716 add_wait_queue(&to_check->sleep, &wait);
1717 snd_pcm_stream_unlock_irq(substream);
1718 up_read(&snd_pcm_link_rwsem);
1719 snd_power_unlock(card);
1720 if (runtime->no_period_wakeup)
1721 tout = MAX_SCHEDULE_TIMEOUT;
1722 else {
1723 tout = 10;
1724 if (runtime->rate) {
1725 long t = runtime->period_size * 2 / runtime->rate;
1726 tout = max(t, tout);
1727 }
1728 tout = msecs_to_jiffies(tout * 1000);
1729 }
1730 tout = schedule_timeout_interruptible(tout);
1731 snd_power_lock(card);
1732 down_read(&snd_pcm_link_rwsem);
1733 snd_pcm_stream_lock_irq(substream);
1734 remove_wait_queue(&to_check->sleep, &wait);
1735 if (card->shutdown) {
1736 result = -ENODEV;
1737 break;
1738 }
1739 if (tout == 0) {
1740 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1741 result = -ESTRPIPE;
1742 else {
1743 dev_dbg(substream->pcm->card->dev,
1744 "playback drain error (DMA or IRQ trouble?)\n");
1745 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1746 result = -EIO;
1747 }
1748 break;
1749 }
1750 }
1751
1752 unlock:
1753 snd_pcm_stream_unlock_irq(substream);
1754 up_read(&snd_pcm_link_rwsem);
1755 snd_power_unlock(card);
1756
1757 return result;
1758 }
1759
1760 /*
1761 * drop ioctl
1762 *
1763 * Immediately put all linked substreams into SETUP state.
1764 */
snd_pcm_drop(struct snd_pcm_substream * substream)1765 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1766 {
1767 struct snd_pcm_runtime *runtime;
1768 int result = 0;
1769
1770 if (PCM_RUNTIME_CHECK(substream))
1771 return -ENXIO;
1772 runtime = substream->runtime;
1773
1774 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1775 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1776 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1777 return -EBADFD;
1778
1779 snd_pcm_stream_lock_irq(substream);
1780 /* resume pause */
1781 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1782 snd_pcm_pause(substream, 0);
1783
1784 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1785 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1786 snd_pcm_stream_unlock_irq(substream);
1787
1788 return result;
1789 }
1790
1791
is_pcm_file(struct file * file)1792 static bool is_pcm_file(struct file *file)
1793 {
1794 struct inode *inode = file_inode(file);
1795 unsigned int minor;
1796
1797 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1798 return false;
1799 minor = iminor(inode);
1800 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1801 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1802 }
1803
1804 /*
1805 * PCM link handling
1806 */
snd_pcm_link(struct snd_pcm_substream * substream,int fd)1807 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1808 {
1809 int res = 0;
1810 struct snd_pcm_file *pcm_file;
1811 struct snd_pcm_substream *substream1;
1812 struct snd_pcm_group *group;
1813 struct fd f = fdget(fd);
1814
1815 if (!f.file)
1816 return -EBADFD;
1817 if (!is_pcm_file(f.file)) {
1818 res = -EBADFD;
1819 goto _badf;
1820 }
1821 pcm_file = f.file->private_data;
1822 substream1 = pcm_file->substream;
1823 group = kmalloc(sizeof(*group), GFP_KERNEL);
1824 if (!group) {
1825 res = -ENOMEM;
1826 goto _nolock;
1827 }
1828 down_write_nonblock(&snd_pcm_link_rwsem);
1829 write_lock_irq(&snd_pcm_link_rwlock);
1830 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1831 substream->runtime->status->state != substream1->runtime->status->state ||
1832 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1833 res = -EBADFD;
1834 goto _end;
1835 }
1836 if (snd_pcm_stream_linked(substream1)) {
1837 res = -EALREADY;
1838 goto _end;
1839 }
1840 if (!snd_pcm_stream_linked(substream)) {
1841 substream->group = group;
1842 group = NULL;
1843 spin_lock_init(&substream->group->lock);
1844 mutex_init(&substream->group->mutex);
1845 INIT_LIST_HEAD(&substream->group->substreams);
1846 list_add_tail(&substream->link_list, &substream->group->substreams);
1847 substream->group->count = 1;
1848 }
1849 list_add_tail(&substream1->link_list, &substream->group->substreams);
1850 substream->group->count++;
1851 substream1->group = substream->group;
1852 _end:
1853 write_unlock_irq(&snd_pcm_link_rwlock);
1854 up_write(&snd_pcm_link_rwsem);
1855 _nolock:
1856 snd_card_unref(substream1->pcm->card);
1857 kfree(group);
1858 _badf:
1859 fdput(f);
1860 return res;
1861 }
1862
relink_to_local(struct snd_pcm_substream * substream)1863 static void relink_to_local(struct snd_pcm_substream *substream)
1864 {
1865 substream->group = &substream->self_group;
1866 INIT_LIST_HEAD(&substream->self_group.substreams);
1867 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1868 }
1869
snd_pcm_unlink(struct snd_pcm_substream * substream)1870 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1871 {
1872 struct snd_pcm_substream *s;
1873 int res = 0;
1874
1875 down_write_nonblock(&snd_pcm_link_rwsem);
1876 write_lock_irq(&snd_pcm_link_rwlock);
1877 if (!snd_pcm_stream_linked(substream)) {
1878 res = -EALREADY;
1879 goto _end;
1880 }
1881 list_del(&substream->link_list);
1882 substream->group->count--;
1883 if (substream->group->count == 1) { /* detach the last stream, too */
1884 snd_pcm_group_for_each_entry(s, substream) {
1885 relink_to_local(s);
1886 break;
1887 }
1888 kfree(substream->group);
1889 }
1890 relink_to_local(substream);
1891 _end:
1892 write_unlock_irq(&snd_pcm_link_rwlock);
1893 up_write(&snd_pcm_link_rwsem);
1894 return res;
1895 }
1896
1897 /*
1898 * hw configurator
1899 */
snd_pcm_hw_rule_mul(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1900 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1901 struct snd_pcm_hw_rule *rule)
1902 {
1903 struct snd_interval t;
1904 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1905 hw_param_interval_c(params, rule->deps[1]), &t);
1906 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1907 }
1908
snd_pcm_hw_rule_div(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1909 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1910 struct snd_pcm_hw_rule *rule)
1911 {
1912 struct snd_interval t;
1913 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1914 hw_param_interval_c(params, rule->deps[1]), &t);
1915 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1916 }
1917
snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1918 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1919 struct snd_pcm_hw_rule *rule)
1920 {
1921 struct snd_interval t;
1922 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1923 hw_param_interval_c(params, rule->deps[1]),
1924 (unsigned long) rule->private, &t);
1925 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1926 }
1927
snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1928 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1929 struct snd_pcm_hw_rule *rule)
1930 {
1931 struct snd_interval t;
1932 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1933 (unsigned long) rule->private,
1934 hw_param_interval_c(params, rule->deps[1]), &t);
1935 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1936 }
1937
snd_pcm_hw_rule_format(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1938 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1939 struct snd_pcm_hw_rule *rule)
1940 {
1941 unsigned int k;
1942 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1943 struct snd_mask m;
1944 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1945 snd_mask_any(&m);
1946 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1947 int bits;
1948 if (! snd_mask_test(mask, k))
1949 continue;
1950 bits = snd_pcm_format_physical_width(k);
1951 if (bits <= 0)
1952 continue; /* ignore invalid formats */
1953 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1954 snd_mask_reset(&m, k);
1955 }
1956 return snd_mask_refine(mask, &m);
1957 }
1958
snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1959 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1960 struct snd_pcm_hw_rule *rule)
1961 {
1962 struct snd_interval t;
1963 unsigned int k;
1964 t.min = UINT_MAX;
1965 t.max = 0;
1966 t.openmin = 0;
1967 t.openmax = 0;
1968 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1969 int bits;
1970 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1971 continue;
1972 bits = snd_pcm_format_physical_width(k);
1973 if (bits <= 0)
1974 continue; /* ignore invalid formats */
1975 if (t.min > (unsigned)bits)
1976 t.min = bits;
1977 if (t.max < (unsigned)bits)
1978 t.max = bits;
1979 }
1980 t.integer = 1;
1981 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1982 }
1983
1984 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1985 #error "Change this table"
1986 #endif
1987
1988 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1989 48000, 64000, 88200, 96000, 176400, 192000 };
1990
1991 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1992 .count = ARRAY_SIZE(rates),
1993 .list = rates,
1994 };
1995
snd_pcm_hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1996 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1997 struct snd_pcm_hw_rule *rule)
1998 {
1999 struct snd_pcm_hardware *hw = rule->private;
2000 return snd_interval_list(hw_param_interval(params, rule->var),
2001 snd_pcm_known_rates.count,
2002 snd_pcm_known_rates.list, hw->rates);
2003 }
2004
snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2005 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2006 struct snd_pcm_hw_rule *rule)
2007 {
2008 struct snd_interval t;
2009 struct snd_pcm_substream *substream = rule->private;
2010 t.min = 0;
2011 t.max = substream->buffer_bytes_max;
2012 t.openmin = 0;
2013 t.openmax = 0;
2014 t.integer = 1;
2015 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2016 }
2017
snd_pcm_hw_constraints_init(struct snd_pcm_substream * substream)2018 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2019 {
2020 struct snd_pcm_runtime *runtime = substream->runtime;
2021 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2022 int k, err;
2023
2024 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2025 snd_mask_any(constrs_mask(constrs, k));
2026 }
2027
2028 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2029 snd_interval_any(constrs_interval(constrs, k));
2030 }
2031
2032 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2033 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2034 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2035 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2036 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2037
2038 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2039 snd_pcm_hw_rule_format, NULL,
2040 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2041 if (err < 0)
2042 return err;
2043 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2044 snd_pcm_hw_rule_sample_bits, NULL,
2045 SNDRV_PCM_HW_PARAM_FORMAT,
2046 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2047 if (err < 0)
2048 return err;
2049 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2050 snd_pcm_hw_rule_div, NULL,
2051 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2052 if (err < 0)
2053 return err;
2054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2055 snd_pcm_hw_rule_mul, NULL,
2056 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2057 if (err < 0)
2058 return err;
2059 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2060 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2061 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2062 if (err < 0)
2063 return err;
2064 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2065 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2066 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2067 if (err < 0)
2068 return err;
2069 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2070 snd_pcm_hw_rule_div, NULL,
2071 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2072 if (err < 0)
2073 return err;
2074 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2075 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2076 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2077 if (err < 0)
2078 return err;
2079 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2080 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2081 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2082 if (err < 0)
2083 return err;
2084 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2085 snd_pcm_hw_rule_div, NULL,
2086 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2087 if (err < 0)
2088 return err;
2089 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2090 snd_pcm_hw_rule_div, NULL,
2091 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2092 if (err < 0)
2093 return err;
2094 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2095 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2096 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2097 if (err < 0)
2098 return err;
2099 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2100 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2101 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2102 if (err < 0)
2103 return err;
2104 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2105 snd_pcm_hw_rule_mul, NULL,
2106 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2107 if (err < 0)
2108 return err;
2109 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2110 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2111 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2112 if (err < 0)
2113 return err;
2114 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2115 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2116 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2117 if (err < 0)
2118 return err;
2119 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2120 snd_pcm_hw_rule_muldivk, (void*) 8,
2121 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2122 if (err < 0)
2123 return err;
2124 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2125 snd_pcm_hw_rule_muldivk, (void*) 8,
2126 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2127 if (err < 0)
2128 return err;
2129 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2130 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2131 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2132 if (err < 0)
2133 return err;
2134 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2135 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2136 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2137 if (err < 0)
2138 return err;
2139 return 0;
2140 }
2141
snd_pcm_hw_constraints_complete(struct snd_pcm_substream * substream)2142 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2143 {
2144 struct snd_pcm_runtime *runtime = substream->runtime;
2145 struct snd_pcm_hardware *hw = &runtime->hw;
2146 int err;
2147 unsigned int mask = 0;
2148
2149 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2150 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2151 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2152 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2153 if (hw_support_mmap(substream)) {
2154 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2155 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2156 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2157 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2158 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2159 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2160 }
2161 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2162 if (err < 0)
2163 return err;
2164
2165 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2166 if (err < 0)
2167 return err;
2168
2169 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2170 if (err < 0)
2171 return err;
2172
2173 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2174 hw->channels_min, hw->channels_max);
2175 if (err < 0)
2176 return err;
2177
2178 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2179 hw->rate_min, hw->rate_max);
2180 if (err < 0)
2181 return err;
2182
2183 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2184 hw->period_bytes_min, hw->period_bytes_max);
2185 if (err < 0)
2186 return err;
2187
2188 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2189 hw->periods_min, hw->periods_max);
2190 if (err < 0)
2191 return err;
2192
2193 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2194 hw->period_bytes_min, hw->buffer_bytes_max);
2195 if (err < 0)
2196 return err;
2197
2198 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2199 snd_pcm_hw_rule_buffer_bytes_max, substream,
2200 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2201 if (err < 0)
2202 return err;
2203
2204 /* FIXME: remove */
2205 if (runtime->dma_bytes) {
2206 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2207 if (err < 0)
2208 return err;
2209 }
2210
2211 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2212 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2213 snd_pcm_hw_rule_rate, hw,
2214 SNDRV_PCM_HW_PARAM_RATE, -1);
2215 if (err < 0)
2216 return err;
2217 }
2218
2219 /* FIXME: this belong to lowlevel */
2220 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2221
2222 return 0;
2223 }
2224
pcm_release_private(struct snd_pcm_substream * substream)2225 static void pcm_release_private(struct snd_pcm_substream *substream)
2226 {
2227 snd_pcm_unlink(substream);
2228 }
2229
snd_pcm_release_substream(struct snd_pcm_substream * substream)2230 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2231 {
2232 substream->ref_count--;
2233 if (substream->ref_count > 0)
2234 return;
2235
2236 snd_pcm_drop(substream);
2237 if (substream->hw_opened) {
2238 if (substream->ops->hw_free &&
2239 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2240 substream->ops->hw_free(substream);
2241 substream->ops->close(substream);
2242 substream->hw_opened = 0;
2243 }
2244 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2245 pm_qos_remove_request(&substream->latency_pm_qos_req);
2246 if (substream->pcm_release) {
2247 substream->pcm_release(substream);
2248 substream->pcm_release = NULL;
2249 }
2250 snd_pcm_detach_substream(substream);
2251 }
2252
2253 EXPORT_SYMBOL(snd_pcm_release_substream);
2254
snd_pcm_open_substream(struct snd_pcm * pcm,int stream,struct file * file,struct snd_pcm_substream ** rsubstream)2255 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2256 struct file *file,
2257 struct snd_pcm_substream **rsubstream)
2258 {
2259 struct snd_pcm_substream *substream;
2260 int err;
2261
2262 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2263 if (err < 0)
2264 return err;
2265 if (substream->ref_count > 1) {
2266 *rsubstream = substream;
2267 return 0;
2268 }
2269
2270 err = snd_pcm_hw_constraints_init(substream);
2271 if (err < 0) {
2272 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2273 goto error;
2274 }
2275
2276 if ((err = substream->ops->open(substream)) < 0)
2277 goto error;
2278
2279 substream->hw_opened = 1;
2280
2281 err = snd_pcm_hw_constraints_complete(substream);
2282 if (err < 0) {
2283 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2284 goto error;
2285 }
2286
2287 *rsubstream = substream;
2288 return 0;
2289
2290 error:
2291 snd_pcm_release_substream(substream);
2292 return err;
2293 }
2294
2295 EXPORT_SYMBOL(snd_pcm_open_substream);
2296
snd_pcm_open_file(struct file * file,struct snd_pcm * pcm,int stream)2297 static int snd_pcm_open_file(struct file *file,
2298 struct snd_pcm *pcm,
2299 int stream)
2300 {
2301 struct snd_pcm_file *pcm_file;
2302 struct snd_pcm_substream *substream;
2303 int err;
2304
2305 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2306 if (err < 0)
2307 return err;
2308
2309 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2310 if (pcm_file == NULL) {
2311 snd_pcm_release_substream(substream);
2312 return -ENOMEM;
2313 }
2314 pcm_file->substream = substream;
2315 if (substream->ref_count == 1) {
2316 substream->file = pcm_file;
2317 substream->pcm_release = pcm_release_private;
2318 }
2319 file->private_data = pcm_file;
2320
2321 return 0;
2322 }
2323
snd_pcm_playback_open(struct inode * inode,struct file * file)2324 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2325 {
2326 struct snd_pcm *pcm;
2327 int err = nonseekable_open(inode, file);
2328 if (err < 0)
2329 return err;
2330 pcm = snd_lookup_minor_data(iminor(inode),
2331 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2332 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2333 if (pcm)
2334 snd_card_unref(pcm->card);
2335 return err;
2336 }
2337
snd_pcm_capture_open(struct inode * inode,struct file * file)2338 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2339 {
2340 struct snd_pcm *pcm;
2341 int err = nonseekable_open(inode, file);
2342 if (err < 0)
2343 return err;
2344 pcm = snd_lookup_minor_data(iminor(inode),
2345 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2346 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2347 if (pcm)
2348 snd_card_unref(pcm->card);
2349 return err;
2350 }
2351
snd_pcm_open(struct file * file,struct snd_pcm * pcm,int stream)2352 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2353 {
2354 int err;
2355 wait_queue_t wait;
2356
2357 if (pcm == NULL) {
2358 err = -ENODEV;
2359 goto __error1;
2360 }
2361 err = snd_card_file_add(pcm->card, file);
2362 if (err < 0)
2363 goto __error1;
2364 if (!try_module_get(pcm->card->module)) {
2365 err = -EFAULT;
2366 goto __error2;
2367 }
2368 init_waitqueue_entry(&wait, current);
2369 add_wait_queue(&pcm->open_wait, &wait);
2370 mutex_lock(&pcm->open_mutex);
2371 while (1) {
2372 err = snd_pcm_open_file(file, pcm, stream);
2373 if (err >= 0)
2374 break;
2375 if (err == -EAGAIN) {
2376 if (file->f_flags & O_NONBLOCK) {
2377 err = -EBUSY;
2378 break;
2379 }
2380 } else
2381 break;
2382 set_current_state(TASK_INTERRUPTIBLE);
2383 mutex_unlock(&pcm->open_mutex);
2384 schedule();
2385 mutex_lock(&pcm->open_mutex);
2386 if (pcm->card->shutdown) {
2387 err = -ENODEV;
2388 break;
2389 }
2390 if (signal_pending(current)) {
2391 err = -ERESTARTSYS;
2392 break;
2393 }
2394 }
2395 remove_wait_queue(&pcm->open_wait, &wait);
2396 mutex_unlock(&pcm->open_mutex);
2397 if (err < 0)
2398 goto __error;
2399 return err;
2400
2401 __error:
2402 module_put(pcm->card->module);
2403 __error2:
2404 snd_card_file_remove(pcm->card, file);
2405 __error1:
2406 return err;
2407 }
2408
snd_pcm_release(struct inode * inode,struct file * file)2409 static int snd_pcm_release(struct inode *inode, struct file *file)
2410 {
2411 struct snd_pcm *pcm;
2412 struct snd_pcm_substream *substream;
2413 struct snd_pcm_file *pcm_file;
2414
2415 pcm_file = file->private_data;
2416 substream = pcm_file->substream;
2417 if (snd_BUG_ON(!substream))
2418 return -ENXIO;
2419 pcm = substream->pcm;
2420 mutex_lock(&pcm->open_mutex);
2421 snd_pcm_release_substream(substream);
2422 kfree(pcm_file);
2423 mutex_unlock(&pcm->open_mutex);
2424 wake_up(&pcm->open_wait);
2425 module_put(pcm->card->module);
2426 snd_card_file_remove(pcm->card, file);
2427 return 0;
2428 }
2429
snd_pcm_playback_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2430 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2431 snd_pcm_uframes_t frames)
2432 {
2433 struct snd_pcm_runtime *runtime = substream->runtime;
2434 snd_pcm_sframes_t appl_ptr;
2435 snd_pcm_sframes_t ret;
2436 snd_pcm_sframes_t hw_avail;
2437
2438 if (frames == 0)
2439 return 0;
2440
2441 snd_pcm_stream_lock_irq(substream);
2442 switch (runtime->status->state) {
2443 case SNDRV_PCM_STATE_PREPARED:
2444 break;
2445 case SNDRV_PCM_STATE_DRAINING:
2446 case SNDRV_PCM_STATE_RUNNING:
2447 if (snd_pcm_update_hw_ptr(substream) >= 0)
2448 break;
2449 /* Fall through */
2450 case SNDRV_PCM_STATE_XRUN:
2451 ret = -EPIPE;
2452 goto __end;
2453 case SNDRV_PCM_STATE_SUSPENDED:
2454 ret = -ESTRPIPE;
2455 goto __end;
2456 default:
2457 ret = -EBADFD;
2458 goto __end;
2459 }
2460
2461 hw_avail = snd_pcm_playback_hw_avail(runtime);
2462 if (hw_avail <= 0) {
2463 ret = 0;
2464 goto __end;
2465 }
2466 if (frames > (snd_pcm_uframes_t)hw_avail)
2467 frames = hw_avail;
2468 appl_ptr = runtime->control->appl_ptr - frames;
2469 if (appl_ptr < 0)
2470 appl_ptr += runtime->boundary;
2471 runtime->control->appl_ptr = appl_ptr;
2472 ret = frames;
2473 __end:
2474 snd_pcm_stream_unlock_irq(substream);
2475 return ret;
2476 }
2477
snd_pcm_capture_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2478 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2479 snd_pcm_uframes_t frames)
2480 {
2481 struct snd_pcm_runtime *runtime = substream->runtime;
2482 snd_pcm_sframes_t appl_ptr;
2483 snd_pcm_sframes_t ret;
2484 snd_pcm_sframes_t hw_avail;
2485
2486 if (frames == 0)
2487 return 0;
2488
2489 snd_pcm_stream_lock_irq(substream);
2490 switch (runtime->status->state) {
2491 case SNDRV_PCM_STATE_PREPARED:
2492 case SNDRV_PCM_STATE_DRAINING:
2493 break;
2494 case SNDRV_PCM_STATE_RUNNING:
2495 if (snd_pcm_update_hw_ptr(substream) >= 0)
2496 break;
2497 /* Fall through */
2498 case SNDRV_PCM_STATE_XRUN:
2499 ret = -EPIPE;
2500 goto __end;
2501 case SNDRV_PCM_STATE_SUSPENDED:
2502 ret = -ESTRPIPE;
2503 goto __end;
2504 default:
2505 ret = -EBADFD;
2506 goto __end;
2507 }
2508
2509 hw_avail = snd_pcm_capture_hw_avail(runtime);
2510 if (hw_avail <= 0) {
2511 ret = 0;
2512 goto __end;
2513 }
2514 if (frames > (snd_pcm_uframes_t)hw_avail)
2515 frames = hw_avail;
2516 appl_ptr = runtime->control->appl_ptr - frames;
2517 if (appl_ptr < 0)
2518 appl_ptr += runtime->boundary;
2519 runtime->control->appl_ptr = appl_ptr;
2520 ret = frames;
2521 __end:
2522 snd_pcm_stream_unlock_irq(substream);
2523 return ret;
2524 }
2525
snd_pcm_playback_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2526 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2527 snd_pcm_uframes_t frames)
2528 {
2529 struct snd_pcm_runtime *runtime = substream->runtime;
2530 snd_pcm_sframes_t appl_ptr;
2531 snd_pcm_sframes_t ret;
2532 snd_pcm_sframes_t avail;
2533
2534 if (frames == 0)
2535 return 0;
2536
2537 snd_pcm_stream_lock_irq(substream);
2538 switch (runtime->status->state) {
2539 case SNDRV_PCM_STATE_PREPARED:
2540 case SNDRV_PCM_STATE_PAUSED:
2541 break;
2542 case SNDRV_PCM_STATE_DRAINING:
2543 case SNDRV_PCM_STATE_RUNNING:
2544 if (snd_pcm_update_hw_ptr(substream) >= 0)
2545 break;
2546 /* Fall through */
2547 case SNDRV_PCM_STATE_XRUN:
2548 ret = -EPIPE;
2549 goto __end;
2550 case SNDRV_PCM_STATE_SUSPENDED:
2551 ret = -ESTRPIPE;
2552 goto __end;
2553 default:
2554 ret = -EBADFD;
2555 goto __end;
2556 }
2557
2558 avail = snd_pcm_playback_avail(runtime);
2559 if (avail <= 0) {
2560 ret = 0;
2561 goto __end;
2562 }
2563 if (frames > (snd_pcm_uframes_t)avail)
2564 frames = avail;
2565 appl_ptr = runtime->control->appl_ptr + frames;
2566 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2567 appl_ptr -= runtime->boundary;
2568 runtime->control->appl_ptr = appl_ptr;
2569 ret = frames;
2570 __end:
2571 snd_pcm_stream_unlock_irq(substream);
2572 return ret;
2573 }
2574
snd_pcm_capture_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2575 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2576 snd_pcm_uframes_t frames)
2577 {
2578 struct snd_pcm_runtime *runtime = substream->runtime;
2579 snd_pcm_sframes_t appl_ptr;
2580 snd_pcm_sframes_t ret;
2581 snd_pcm_sframes_t avail;
2582
2583 if (frames == 0)
2584 return 0;
2585
2586 snd_pcm_stream_lock_irq(substream);
2587 switch (runtime->status->state) {
2588 case SNDRV_PCM_STATE_PREPARED:
2589 case SNDRV_PCM_STATE_DRAINING:
2590 case SNDRV_PCM_STATE_PAUSED:
2591 break;
2592 case SNDRV_PCM_STATE_RUNNING:
2593 if (snd_pcm_update_hw_ptr(substream) >= 0)
2594 break;
2595 /* Fall through */
2596 case SNDRV_PCM_STATE_XRUN:
2597 ret = -EPIPE;
2598 goto __end;
2599 case SNDRV_PCM_STATE_SUSPENDED:
2600 ret = -ESTRPIPE;
2601 goto __end;
2602 default:
2603 ret = -EBADFD;
2604 goto __end;
2605 }
2606
2607 avail = snd_pcm_capture_avail(runtime);
2608 if (avail <= 0) {
2609 ret = 0;
2610 goto __end;
2611 }
2612 if (frames > (snd_pcm_uframes_t)avail)
2613 frames = avail;
2614 appl_ptr = runtime->control->appl_ptr + frames;
2615 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2616 appl_ptr -= runtime->boundary;
2617 runtime->control->appl_ptr = appl_ptr;
2618 ret = frames;
2619 __end:
2620 snd_pcm_stream_unlock_irq(substream);
2621 return ret;
2622 }
2623
snd_pcm_hwsync(struct snd_pcm_substream * substream)2624 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2625 {
2626 struct snd_pcm_runtime *runtime = substream->runtime;
2627 int err;
2628
2629 snd_pcm_stream_lock_irq(substream);
2630 switch (runtime->status->state) {
2631 case SNDRV_PCM_STATE_DRAINING:
2632 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2633 goto __badfd;
2634 /* Fall through */
2635 case SNDRV_PCM_STATE_RUNNING:
2636 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2637 break;
2638 /* Fall through */
2639 case SNDRV_PCM_STATE_PREPARED:
2640 err = 0;
2641 break;
2642 case SNDRV_PCM_STATE_SUSPENDED:
2643 err = -ESTRPIPE;
2644 break;
2645 case SNDRV_PCM_STATE_XRUN:
2646 err = -EPIPE;
2647 break;
2648 default:
2649 __badfd:
2650 err = -EBADFD;
2651 break;
2652 }
2653 snd_pcm_stream_unlock_irq(substream);
2654 return err;
2655 }
2656
snd_pcm_delay(struct snd_pcm_substream * substream,snd_pcm_sframes_t __user * res)2657 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2658 snd_pcm_sframes_t __user *res)
2659 {
2660 struct snd_pcm_runtime *runtime = substream->runtime;
2661 int err;
2662 snd_pcm_sframes_t n = 0;
2663
2664 snd_pcm_stream_lock_irq(substream);
2665 switch (runtime->status->state) {
2666 case SNDRV_PCM_STATE_DRAINING:
2667 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2668 goto __badfd;
2669 /* Fall through */
2670 case SNDRV_PCM_STATE_RUNNING:
2671 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2672 break;
2673 /* Fall through */
2674 case SNDRV_PCM_STATE_PREPARED:
2675 case SNDRV_PCM_STATE_SUSPENDED:
2676 err = 0;
2677 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2678 n = snd_pcm_playback_hw_avail(runtime);
2679 else
2680 n = snd_pcm_capture_avail(runtime);
2681 n += runtime->delay;
2682 break;
2683 case SNDRV_PCM_STATE_XRUN:
2684 err = -EPIPE;
2685 break;
2686 default:
2687 __badfd:
2688 err = -EBADFD;
2689 break;
2690 }
2691 snd_pcm_stream_unlock_irq(substream);
2692 if (!err)
2693 if (put_user(n, res))
2694 err = -EFAULT;
2695 return err;
2696 }
2697
snd_pcm_sync_ptr(struct snd_pcm_substream * substream,struct snd_pcm_sync_ptr __user * _sync_ptr)2698 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2699 struct snd_pcm_sync_ptr __user *_sync_ptr)
2700 {
2701 struct snd_pcm_runtime *runtime = substream->runtime;
2702 struct snd_pcm_sync_ptr sync_ptr;
2703 volatile struct snd_pcm_mmap_status *status;
2704 volatile struct snd_pcm_mmap_control *control;
2705 int err;
2706
2707 memset(&sync_ptr, 0, sizeof(sync_ptr));
2708 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2709 return -EFAULT;
2710 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2711 return -EFAULT;
2712 status = runtime->status;
2713 control = runtime->control;
2714 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2715 err = snd_pcm_hwsync(substream);
2716 if (err < 0)
2717 return err;
2718 }
2719 snd_pcm_stream_lock_irq(substream);
2720 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2721 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2722 else
2723 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2724 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2725 control->avail_min = sync_ptr.c.control.avail_min;
2726 else
2727 sync_ptr.c.control.avail_min = control->avail_min;
2728 sync_ptr.s.status.state = status->state;
2729 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2730 sync_ptr.s.status.tstamp = status->tstamp;
2731 sync_ptr.s.status.suspended_state = status->suspended_state;
2732 snd_pcm_stream_unlock_irq(substream);
2733 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2734 return -EFAULT;
2735 return 0;
2736 }
2737
snd_pcm_tstamp(struct snd_pcm_substream * substream,int __user * _arg)2738 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2739 {
2740 struct snd_pcm_runtime *runtime = substream->runtime;
2741 int arg;
2742
2743 if (get_user(arg, _arg))
2744 return -EFAULT;
2745 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2746 return -EINVAL;
2747 runtime->tstamp_type = arg;
2748 return 0;
2749 }
2750
snd_pcm_common_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2751 static int snd_pcm_common_ioctl1(struct file *file,
2752 struct snd_pcm_substream *substream,
2753 unsigned int cmd, void __user *arg)
2754 {
2755 switch (cmd) {
2756 case SNDRV_PCM_IOCTL_PVERSION:
2757 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2758 case SNDRV_PCM_IOCTL_INFO:
2759 return snd_pcm_info_user(substream, arg);
2760 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2761 return 0;
2762 case SNDRV_PCM_IOCTL_TTSTAMP:
2763 return snd_pcm_tstamp(substream, arg);
2764 case SNDRV_PCM_IOCTL_HW_REFINE:
2765 return snd_pcm_hw_refine_user(substream, arg);
2766 case SNDRV_PCM_IOCTL_HW_PARAMS:
2767 return snd_pcm_hw_params_user(substream, arg);
2768 case SNDRV_PCM_IOCTL_HW_FREE:
2769 return snd_pcm_hw_free(substream);
2770 case SNDRV_PCM_IOCTL_SW_PARAMS:
2771 return snd_pcm_sw_params_user(substream, arg);
2772 case SNDRV_PCM_IOCTL_STATUS:
2773 return snd_pcm_status_user(substream, arg, false);
2774 case SNDRV_PCM_IOCTL_STATUS_EXT:
2775 return snd_pcm_status_user(substream, arg, true);
2776 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2777 return snd_pcm_channel_info_user(substream, arg);
2778 case SNDRV_PCM_IOCTL_PREPARE:
2779 return snd_pcm_prepare(substream, file);
2780 case SNDRV_PCM_IOCTL_RESET:
2781 return snd_pcm_reset(substream);
2782 case SNDRV_PCM_IOCTL_START:
2783 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2784 case SNDRV_PCM_IOCTL_LINK:
2785 return snd_pcm_link(substream, (int)(unsigned long) arg);
2786 case SNDRV_PCM_IOCTL_UNLINK:
2787 return snd_pcm_unlink(substream);
2788 case SNDRV_PCM_IOCTL_RESUME:
2789 return snd_pcm_resume(substream);
2790 case SNDRV_PCM_IOCTL_XRUN:
2791 return snd_pcm_xrun(substream);
2792 case SNDRV_PCM_IOCTL_HWSYNC:
2793 return snd_pcm_hwsync(substream);
2794 case SNDRV_PCM_IOCTL_DELAY:
2795 return snd_pcm_delay(substream, arg);
2796 case SNDRV_PCM_IOCTL_SYNC_PTR:
2797 return snd_pcm_sync_ptr(substream, arg);
2798 #ifdef CONFIG_SND_SUPPORT_OLD_API
2799 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2800 return snd_pcm_hw_refine_old_user(substream, arg);
2801 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2802 return snd_pcm_hw_params_old_user(substream, arg);
2803 #endif
2804 case SNDRV_PCM_IOCTL_DRAIN:
2805 return snd_pcm_drain(substream, file);
2806 case SNDRV_PCM_IOCTL_DROP:
2807 return snd_pcm_drop(substream);
2808 case SNDRV_PCM_IOCTL_PAUSE:
2809 {
2810 int res;
2811 snd_pcm_stream_lock_irq(substream);
2812 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2813 snd_pcm_stream_unlock_irq(substream);
2814 return res;
2815 }
2816 }
2817 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2818 return -ENOTTY;
2819 }
2820
snd_pcm_playback_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2821 static int snd_pcm_playback_ioctl1(struct file *file,
2822 struct snd_pcm_substream *substream,
2823 unsigned int cmd, void __user *arg)
2824 {
2825 if (snd_BUG_ON(!substream))
2826 return -ENXIO;
2827 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2828 return -EINVAL;
2829 switch (cmd) {
2830 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2831 {
2832 struct snd_xferi xferi;
2833 struct snd_xferi __user *_xferi = arg;
2834 struct snd_pcm_runtime *runtime = substream->runtime;
2835 snd_pcm_sframes_t result;
2836 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2837 return -EBADFD;
2838 if (put_user(0, &_xferi->result))
2839 return -EFAULT;
2840 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2841 return -EFAULT;
2842 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2843 __put_user(result, &_xferi->result);
2844 return result < 0 ? result : 0;
2845 }
2846 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2847 {
2848 struct snd_xfern xfern;
2849 struct snd_xfern __user *_xfern = arg;
2850 struct snd_pcm_runtime *runtime = substream->runtime;
2851 void __user **bufs;
2852 snd_pcm_sframes_t result;
2853 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2854 return -EBADFD;
2855 if (runtime->channels > 128)
2856 return -EINVAL;
2857 if (put_user(0, &_xfern->result))
2858 return -EFAULT;
2859 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2860 return -EFAULT;
2861
2862 bufs = memdup_user(xfern.bufs,
2863 sizeof(void *) * runtime->channels);
2864 if (IS_ERR(bufs))
2865 return PTR_ERR(bufs);
2866 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2867 kfree(bufs);
2868 __put_user(result, &_xfern->result);
2869 return result < 0 ? result : 0;
2870 }
2871 case SNDRV_PCM_IOCTL_REWIND:
2872 {
2873 snd_pcm_uframes_t frames;
2874 snd_pcm_uframes_t __user *_frames = arg;
2875 snd_pcm_sframes_t result;
2876 if (get_user(frames, _frames))
2877 return -EFAULT;
2878 if (put_user(0, _frames))
2879 return -EFAULT;
2880 result = snd_pcm_playback_rewind(substream, frames);
2881 __put_user(result, _frames);
2882 return result < 0 ? result : 0;
2883 }
2884 case SNDRV_PCM_IOCTL_FORWARD:
2885 {
2886 snd_pcm_uframes_t frames;
2887 snd_pcm_uframes_t __user *_frames = arg;
2888 snd_pcm_sframes_t result;
2889 if (get_user(frames, _frames))
2890 return -EFAULT;
2891 if (put_user(0, _frames))
2892 return -EFAULT;
2893 result = snd_pcm_playback_forward(substream, frames);
2894 __put_user(result, _frames);
2895 return result < 0 ? result : 0;
2896 }
2897 }
2898 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2899 }
2900
snd_pcm_capture_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2901 static int snd_pcm_capture_ioctl1(struct file *file,
2902 struct snd_pcm_substream *substream,
2903 unsigned int cmd, void __user *arg)
2904 {
2905 if (snd_BUG_ON(!substream))
2906 return -ENXIO;
2907 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2908 return -EINVAL;
2909 switch (cmd) {
2910 case SNDRV_PCM_IOCTL_READI_FRAMES:
2911 {
2912 struct snd_xferi xferi;
2913 struct snd_xferi __user *_xferi = arg;
2914 struct snd_pcm_runtime *runtime = substream->runtime;
2915 snd_pcm_sframes_t result;
2916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2917 return -EBADFD;
2918 if (put_user(0, &_xferi->result))
2919 return -EFAULT;
2920 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2921 return -EFAULT;
2922 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2923 __put_user(result, &_xferi->result);
2924 return result < 0 ? result : 0;
2925 }
2926 case SNDRV_PCM_IOCTL_READN_FRAMES:
2927 {
2928 struct snd_xfern xfern;
2929 struct snd_xfern __user *_xfern = arg;
2930 struct snd_pcm_runtime *runtime = substream->runtime;
2931 void *bufs;
2932 snd_pcm_sframes_t result;
2933 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2934 return -EBADFD;
2935 if (runtime->channels > 128)
2936 return -EINVAL;
2937 if (put_user(0, &_xfern->result))
2938 return -EFAULT;
2939 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2940 return -EFAULT;
2941
2942 bufs = memdup_user(xfern.bufs,
2943 sizeof(void *) * runtime->channels);
2944 if (IS_ERR(bufs))
2945 return PTR_ERR(bufs);
2946 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2947 kfree(bufs);
2948 __put_user(result, &_xfern->result);
2949 return result < 0 ? result : 0;
2950 }
2951 case SNDRV_PCM_IOCTL_REWIND:
2952 {
2953 snd_pcm_uframes_t frames;
2954 snd_pcm_uframes_t __user *_frames = arg;
2955 snd_pcm_sframes_t result;
2956 if (get_user(frames, _frames))
2957 return -EFAULT;
2958 if (put_user(0, _frames))
2959 return -EFAULT;
2960 result = snd_pcm_capture_rewind(substream, frames);
2961 __put_user(result, _frames);
2962 return result < 0 ? result : 0;
2963 }
2964 case SNDRV_PCM_IOCTL_FORWARD:
2965 {
2966 snd_pcm_uframes_t frames;
2967 snd_pcm_uframes_t __user *_frames = arg;
2968 snd_pcm_sframes_t result;
2969 if (get_user(frames, _frames))
2970 return -EFAULT;
2971 if (put_user(0, _frames))
2972 return -EFAULT;
2973 result = snd_pcm_capture_forward(substream, frames);
2974 __put_user(result, _frames);
2975 return result < 0 ? result : 0;
2976 }
2977 }
2978 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2979 }
2980
snd_pcm_playback_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2981 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2982 unsigned long arg)
2983 {
2984 struct snd_pcm_file *pcm_file;
2985
2986 pcm_file = file->private_data;
2987
2988 if (((cmd >> 8) & 0xff) != 'A')
2989 return -ENOTTY;
2990
2991 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2992 (void __user *)arg);
2993 }
2994
snd_pcm_capture_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2995 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2996 unsigned long arg)
2997 {
2998 struct snd_pcm_file *pcm_file;
2999
3000 pcm_file = file->private_data;
3001
3002 if (((cmd >> 8) & 0xff) != 'A')
3003 return -ENOTTY;
3004
3005 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
3006 (void __user *)arg);
3007 }
3008
snd_pcm_kernel_ioctl(struct snd_pcm_substream * substream,unsigned int cmd,void * arg)3009 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3010 unsigned int cmd, void *arg)
3011 {
3012 mm_segment_t fs;
3013 int result;
3014
3015 fs = snd_enter_user();
3016 switch (substream->stream) {
3017 case SNDRV_PCM_STREAM_PLAYBACK:
3018 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
3019 (void __user *)arg);
3020 break;
3021 case SNDRV_PCM_STREAM_CAPTURE:
3022 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
3023 (void __user *)arg);
3024 break;
3025 default:
3026 result = -EINVAL;
3027 break;
3028 }
3029 snd_leave_user(fs);
3030 return result;
3031 }
3032
3033 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3034
snd_pcm_read(struct file * file,char __user * buf,size_t count,loff_t * offset)3035 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3036 loff_t * offset)
3037 {
3038 struct snd_pcm_file *pcm_file;
3039 struct snd_pcm_substream *substream;
3040 struct snd_pcm_runtime *runtime;
3041 snd_pcm_sframes_t result;
3042
3043 pcm_file = file->private_data;
3044 substream = pcm_file->substream;
3045 if (PCM_RUNTIME_CHECK(substream))
3046 return -ENXIO;
3047 runtime = substream->runtime;
3048 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3049 return -EBADFD;
3050 if (!frame_aligned(runtime, count))
3051 return -EINVAL;
3052 count = bytes_to_frames(runtime, count);
3053 result = snd_pcm_lib_read(substream, buf, count);
3054 if (result > 0)
3055 result = frames_to_bytes(runtime, result);
3056 return result;
3057 }
3058
snd_pcm_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)3059 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3060 size_t count, loff_t * offset)
3061 {
3062 struct snd_pcm_file *pcm_file;
3063 struct snd_pcm_substream *substream;
3064 struct snd_pcm_runtime *runtime;
3065 snd_pcm_sframes_t result;
3066
3067 pcm_file = file->private_data;
3068 substream = pcm_file->substream;
3069 if (PCM_RUNTIME_CHECK(substream))
3070 return -ENXIO;
3071 runtime = substream->runtime;
3072 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3073 return -EBADFD;
3074 if (!frame_aligned(runtime, count))
3075 return -EINVAL;
3076 count = bytes_to_frames(runtime, count);
3077 result = snd_pcm_lib_write(substream, buf, count);
3078 if (result > 0)
3079 result = frames_to_bytes(runtime, result);
3080 return result;
3081 }
3082
snd_pcm_readv(struct kiocb * iocb,struct iov_iter * to)3083 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3084 {
3085 struct snd_pcm_file *pcm_file;
3086 struct snd_pcm_substream *substream;
3087 struct snd_pcm_runtime *runtime;
3088 snd_pcm_sframes_t result;
3089 unsigned long i;
3090 void __user **bufs;
3091 snd_pcm_uframes_t frames;
3092
3093 pcm_file = iocb->ki_filp->private_data;
3094 substream = pcm_file->substream;
3095 if (PCM_RUNTIME_CHECK(substream))
3096 return -ENXIO;
3097 runtime = substream->runtime;
3098 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3099 return -EBADFD;
3100 if (!iter_is_iovec(to))
3101 return -EINVAL;
3102 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3103 return -EINVAL;
3104 if (!frame_aligned(runtime, to->iov->iov_len))
3105 return -EINVAL;
3106 frames = bytes_to_samples(runtime, to->iov->iov_len);
3107 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3108 if (bufs == NULL)
3109 return -ENOMEM;
3110 for (i = 0; i < to->nr_segs; ++i)
3111 bufs[i] = to->iov[i].iov_base;
3112 result = snd_pcm_lib_readv(substream, bufs, frames);
3113 if (result > 0)
3114 result = frames_to_bytes(runtime, result);
3115 kfree(bufs);
3116 return result;
3117 }
3118
snd_pcm_writev(struct kiocb * iocb,struct iov_iter * from)3119 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3120 {
3121 struct snd_pcm_file *pcm_file;
3122 struct snd_pcm_substream *substream;
3123 struct snd_pcm_runtime *runtime;
3124 snd_pcm_sframes_t result;
3125 unsigned long i;
3126 void __user **bufs;
3127 snd_pcm_uframes_t frames;
3128
3129 pcm_file = iocb->ki_filp->private_data;
3130 substream = pcm_file->substream;
3131 if (PCM_RUNTIME_CHECK(substream))
3132 return -ENXIO;
3133 runtime = substream->runtime;
3134 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3135 return -EBADFD;
3136 if (!iter_is_iovec(from))
3137 return -EINVAL;
3138 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3139 !frame_aligned(runtime, from->iov->iov_len))
3140 return -EINVAL;
3141 frames = bytes_to_samples(runtime, from->iov->iov_len);
3142 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3143 if (bufs == NULL)
3144 return -ENOMEM;
3145 for (i = 0; i < from->nr_segs; ++i)
3146 bufs[i] = from->iov[i].iov_base;
3147 result = snd_pcm_lib_writev(substream, bufs, frames);
3148 if (result > 0)
3149 result = frames_to_bytes(runtime, result);
3150 kfree(bufs);
3151 return result;
3152 }
3153
snd_pcm_playback_poll(struct file * file,poll_table * wait)3154 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3155 {
3156 struct snd_pcm_file *pcm_file;
3157 struct snd_pcm_substream *substream;
3158 struct snd_pcm_runtime *runtime;
3159 unsigned int mask;
3160 snd_pcm_uframes_t avail;
3161
3162 pcm_file = file->private_data;
3163
3164 substream = pcm_file->substream;
3165 if (PCM_RUNTIME_CHECK(substream))
3166 return POLLOUT | POLLWRNORM | POLLERR;
3167 runtime = substream->runtime;
3168
3169 poll_wait(file, &runtime->sleep, wait);
3170
3171 snd_pcm_stream_lock_irq(substream);
3172 avail = snd_pcm_playback_avail(runtime);
3173 switch (runtime->status->state) {
3174 case SNDRV_PCM_STATE_RUNNING:
3175 case SNDRV_PCM_STATE_PREPARED:
3176 case SNDRV_PCM_STATE_PAUSED:
3177 if (avail >= runtime->control->avail_min) {
3178 mask = POLLOUT | POLLWRNORM;
3179 break;
3180 }
3181 /* Fall through */
3182 case SNDRV_PCM_STATE_DRAINING:
3183 mask = 0;
3184 break;
3185 default:
3186 mask = POLLOUT | POLLWRNORM | POLLERR;
3187 break;
3188 }
3189 snd_pcm_stream_unlock_irq(substream);
3190 return mask;
3191 }
3192
snd_pcm_capture_poll(struct file * file,poll_table * wait)3193 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3194 {
3195 struct snd_pcm_file *pcm_file;
3196 struct snd_pcm_substream *substream;
3197 struct snd_pcm_runtime *runtime;
3198 unsigned int mask;
3199 snd_pcm_uframes_t avail;
3200
3201 pcm_file = file->private_data;
3202
3203 substream = pcm_file->substream;
3204 if (PCM_RUNTIME_CHECK(substream))
3205 return POLLIN | POLLRDNORM | POLLERR;
3206 runtime = substream->runtime;
3207
3208 poll_wait(file, &runtime->sleep, wait);
3209
3210 snd_pcm_stream_lock_irq(substream);
3211 avail = snd_pcm_capture_avail(runtime);
3212 switch (runtime->status->state) {
3213 case SNDRV_PCM_STATE_RUNNING:
3214 case SNDRV_PCM_STATE_PREPARED:
3215 case SNDRV_PCM_STATE_PAUSED:
3216 if (avail >= runtime->control->avail_min) {
3217 mask = POLLIN | POLLRDNORM;
3218 break;
3219 }
3220 mask = 0;
3221 break;
3222 case SNDRV_PCM_STATE_DRAINING:
3223 if (avail > 0) {
3224 mask = POLLIN | POLLRDNORM;
3225 break;
3226 }
3227 /* Fall through */
3228 default:
3229 mask = POLLIN | POLLRDNORM | POLLERR;
3230 break;
3231 }
3232 snd_pcm_stream_unlock_irq(substream);
3233 return mask;
3234 }
3235
3236 /*
3237 * mmap support
3238 */
3239
3240 /*
3241 * Only on coherent architectures, we can mmap the status and the control records
3242 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3243 */
3244 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3245 /*
3246 * mmap status record
3247 */
snd_pcm_mmap_status_fault(struct vm_area_struct * area,struct vm_fault * vmf)3248 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3249 struct vm_fault *vmf)
3250 {
3251 struct snd_pcm_substream *substream = area->vm_private_data;
3252 struct snd_pcm_runtime *runtime;
3253
3254 if (substream == NULL)
3255 return VM_FAULT_SIGBUS;
3256 runtime = substream->runtime;
3257 vmf->page = virt_to_page(runtime->status);
3258 get_page(vmf->page);
3259 return 0;
3260 }
3261
3262 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3263 {
3264 .fault = snd_pcm_mmap_status_fault,
3265 };
3266
snd_pcm_mmap_status(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3267 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3268 struct vm_area_struct *area)
3269 {
3270 long size;
3271 if (!(area->vm_flags & VM_READ))
3272 return -EINVAL;
3273 size = area->vm_end - area->vm_start;
3274 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3275 return -EINVAL;
3276 area->vm_ops = &snd_pcm_vm_ops_status;
3277 area->vm_private_data = substream;
3278 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3279 return 0;
3280 }
3281
3282 /*
3283 * mmap control record
3284 */
snd_pcm_mmap_control_fault(struct vm_area_struct * area,struct vm_fault * vmf)3285 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3286 struct vm_fault *vmf)
3287 {
3288 struct snd_pcm_substream *substream = area->vm_private_data;
3289 struct snd_pcm_runtime *runtime;
3290
3291 if (substream == NULL)
3292 return VM_FAULT_SIGBUS;
3293 runtime = substream->runtime;
3294 vmf->page = virt_to_page(runtime->control);
3295 get_page(vmf->page);
3296 return 0;
3297 }
3298
3299 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3300 {
3301 .fault = snd_pcm_mmap_control_fault,
3302 };
3303
snd_pcm_mmap_control(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3304 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3305 struct vm_area_struct *area)
3306 {
3307 long size;
3308 if (!(area->vm_flags & VM_READ))
3309 return -EINVAL;
3310 size = area->vm_end - area->vm_start;
3311 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3312 return -EINVAL;
3313 area->vm_ops = &snd_pcm_vm_ops_control;
3314 area->vm_private_data = substream;
3315 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3316 return 0;
3317 }
3318 #else /* ! coherent mmap */
3319 /*
3320 * don't support mmap for status and control records.
3321 */
snd_pcm_mmap_status(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3322 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3323 struct vm_area_struct *area)
3324 {
3325 return -ENXIO;
3326 }
snd_pcm_mmap_control(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3327 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3328 struct vm_area_struct *area)
3329 {
3330 return -ENXIO;
3331 }
3332 #endif /* coherent mmap */
3333
3334 static inline struct page *
snd_pcm_default_page_ops(struct snd_pcm_substream * substream,unsigned long ofs)3335 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3336 {
3337 void *vaddr = substream->runtime->dma_area + ofs;
3338 return virt_to_page(vaddr);
3339 }
3340
3341 /*
3342 * fault callback for mmapping a RAM page
3343 */
snd_pcm_mmap_data_fault(struct vm_area_struct * area,struct vm_fault * vmf)3344 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3345 struct vm_fault *vmf)
3346 {
3347 struct snd_pcm_substream *substream = area->vm_private_data;
3348 struct snd_pcm_runtime *runtime;
3349 unsigned long offset;
3350 struct page * page;
3351 size_t dma_bytes;
3352
3353 if (substream == NULL)
3354 return VM_FAULT_SIGBUS;
3355 runtime = substream->runtime;
3356 offset = vmf->pgoff << PAGE_SHIFT;
3357 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3358 if (offset > dma_bytes - PAGE_SIZE)
3359 return VM_FAULT_SIGBUS;
3360 if (substream->ops->page)
3361 page = substream->ops->page(substream, offset);
3362 else
3363 page = snd_pcm_default_page_ops(substream, offset);
3364 if (!page)
3365 return VM_FAULT_SIGBUS;
3366 get_page(page);
3367 vmf->page = page;
3368 return 0;
3369 }
3370
3371 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3372 .open = snd_pcm_mmap_data_open,
3373 .close = snd_pcm_mmap_data_close,
3374 };
3375
3376 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3377 .open = snd_pcm_mmap_data_open,
3378 .close = snd_pcm_mmap_data_close,
3379 .fault = snd_pcm_mmap_data_fault,
3380 };
3381
3382 /*
3383 * mmap the DMA buffer on RAM
3384 */
3385
3386 /**
3387 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3388 * @substream: PCM substream
3389 * @area: VMA
3390 *
3391 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3392 * this function is invoked implicitly.
3393 */
snd_pcm_lib_default_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * area)3394 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3395 struct vm_area_struct *area)
3396 {
3397 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3398 #ifdef CONFIG_GENERIC_ALLOCATOR
3399 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3400 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3401 return remap_pfn_range(area, area->vm_start,
3402 substream->dma_buffer.addr >> PAGE_SHIFT,
3403 area->vm_end - area->vm_start, area->vm_page_prot);
3404 }
3405 #endif /* CONFIG_GENERIC_ALLOCATOR */
3406 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3407 if (!substream->ops->page &&
3408 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3409 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3410 area,
3411 substream->runtime->dma_area,
3412 substream->runtime->dma_addr,
3413 substream->runtime->dma_bytes);
3414 #endif /* CONFIG_X86 */
3415 /* mmap with fault handler */
3416 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3417 return 0;
3418 }
3419 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3420
3421 /*
3422 * mmap the DMA buffer on I/O memory area
3423 */
3424 #if SNDRV_PCM_INFO_MMAP_IOMEM
3425 /**
3426 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3427 * @substream: PCM substream
3428 * @area: VMA
3429 *
3430 * When your hardware uses the iomapped pages as the hardware buffer and
3431 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3432 * is supposed to work only on limited architectures.
3433 */
snd_pcm_lib_mmap_iomem(struct snd_pcm_substream * substream,struct vm_area_struct * area)3434 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3435 struct vm_area_struct *area)
3436 {
3437 struct snd_pcm_runtime *runtime = substream->runtime;;
3438
3439 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3440 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3441 }
3442
3443 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3444 #endif /* SNDRV_PCM_INFO_MMAP */
3445
3446 /*
3447 * mmap DMA buffer
3448 */
snd_pcm_mmap_data(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3449 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3450 struct vm_area_struct *area)
3451 {
3452 struct snd_pcm_runtime *runtime;
3453 long size;
3454 unsigned long offset;
3455 size_t dma_bytes;
3456 int err;
3457
3458 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3459 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3460 return -EINVAL;
3461 } else {
3462 if (!(area->vm_flags & VM_READ))
3463 return -EINVAL;
3464 }
3465 runtime = substream->runtime;
3466 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3467 return -EBADFD;
3468 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3469 return -ENXIO;
3470 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3471 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3472 return -EINVAL;
3473 size = area->vm_end - area->vm_start;
3474 offset = area->vm_pgoff << PAGE_SHIFT;
3475 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3476 if ((size_t)size > dma_bytes)
3477 return -EINVAL;
3478 if (offset > dma_bytes - size)
3479 return -EINVAL;
3480
3481 area->vm_ops = &snd_pcm_vm_ops_data;
3482 area->vm_private_data = substream;
3483 if (substream->ops->mmap)
3484 err = substream->ops->mmap(substream, area);
3485 else
3486 err = snd_pcm_lib_default_mmap(substream, area);
3487 if (!err)
3488 atomic_inc(&substream->mmap_count);
3489 return err;
3490 }
3491
3492 EXPORT_SYMBOL(snd_pcm_mmap_data);
3493
snd_pcm_mmap(struct file * file,struct vm_area_struct * area)3494 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3495 {
3496 struct snd_pcm_file * pcm_file;
3497 struct snd_pcm_substream *substream;
3498 unsigned long offset;
3499
3500 pcm_file = file->private_data;
3501 substream = pcm_file->substream;
3502 if (PCM_RUNTIME_CHECK(substream))
3503 return -ENXIO;
3504
3505 offset = area->vm_pgoff << PAGE_SHIFT;
3506 switch (offset) {
3507 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3508 if (pcm_file->no_compat_mmap)
3509 return -ENXIO;
3510 return snd_pcm_mmap_status(substream, file, area);
3511 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3512 if (pcm_file->no_compat_mmap)
3513 return -ENXIO;
3514 return snd_pcm_mmap_control(substream, file, area);
3515 default:
3516 return snd_pcm_mmap_data(substream, file, area);
3517 }
3518 return 0;
3519 }
3520
snd_pcm_fasync(int fd,struct file * file,int on)3521 static int snd_pcm_fasync(int fd, struct file * file, int on)
3522 {
3523 struct snd_pcm_file * pcm_file;
3524 struct snd_pcm_substream *substream;
3525 struct snd_pcm_runtime *runtime;
3526
3527 pcm_file = file->private_data;
3528 substream = pcm_file->substream;
3529 if (PCM_RUNTIME_CHECK(substream))
3530 return -ENXIO;
3531 runtime = substream->runtime;
3532 return fasync_helper(fd, file, on, &runtime->fasync);
3533 }
3534
3535 /*
3536 * ioctl32 compat
3537 */
3538 #ifdef CONFIG_COMPAT
3539 #include "pcm_compat.c"
3540 #else
3541 #define snd_pcm_ioctl_compat NULL
3542 #endif
3543
3544 /*
3545 * To be removed helpers to keep binary compatibility
3546 */
3547
3548 #ifdef CONFIG_SND_SUPPORT_OLD_API
3549 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3550 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3551
snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params * params,struct snd_pcm_hw_params_old * oparams)3552 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3553 struct snd_pcm_hw_params_old *oparams)
3554 {
3555 unsigned int i;
3556
3557 memset(params, 0, sizeof(*params));
3558 params->flags = oparams->flags;
3559 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3560 params->masks[i].bits[0] = oparams->masks[i];
3561 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3562 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3563 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3564 params->info = oparams->info;
3565 params->msbits = oparams->msbits;
3566 params->rate_num = oparams->rate_num;
3567 params->rate_den = oparams->rate_den;
3568 params->fifo_size = oparams->fifo_size;
3569 }
3570
snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old * oparams,struct snd_pcm_hw_params * params)3571 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3572 struct snd_pcm_hw_params *params)
3573 {
3574 unsigned int i;
3575
3576 memset(oparams, 0, sizeof(*oparams));
3577 oparams->flags = params->flags;
3578 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3579 oparams->masks[i] = params->masks[i].bits[0];
3580 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3581 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3582 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3583 oparams->info = params->info;
3584 oparams->msbits = params->msbits;
3585 oparams->rate_num = params->rate_num;
3586 oparams->rate_den = params->rate_den;
3587 oparams->fifo_size = params->fifo_size;
3588 }
3589
snd_pcm_hw_refine_old_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params_old __user * _oparams)3590 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3591 struct snd_pcm_hw_params_old __user * _oparams)
3592 {
3593 struct snd_pcm_hw_params *params;
3594 struct snd_pcm_hw_params_old *oparams = NULL;
3595 int err;
3596
3597 params = kmalloc(sizeof(*params), GFP_KERNEL);
3598 if (!params)
3599 return -ENOMEM;
3600
3601 oparams = memdup_user(_oparams, sizeof(*oparams));
3602 if (IS_ERR(oparams)) {
3603 err = PTR_ERR(oparams);
3604 goto out;
3605 }
3606 snd_pcm_hw_convert_from_old_params(params, oparams);
3607 err = snd_pcm_hw_refine(substream, params);
3608 snd_pcm_hw_convert_to_old_params(oparams, params);
3609 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3610 if (!err)
3611 err = -EFAULT;
3612 }
3613
3614 kfree(oparams);
3615 out:
3616 kfree(params);
3617 return err;
3618 }
3619
snd_pcm_hw_params_old_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params_old __user * _oparams)3620 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3621 struct snd_pcm_hw_params_old __user * _oparams)
3622 {
3623 struct snd_pcm_hw_params *params;
3624 struct snd_pcm_hw_params_old *oparams = NULL;
3625 int err;
3626
3627 params = kmalloc(sizeof(*params), GFP_KERNEL);
3628 if (!params)
3629 return -ENOMEM;
3630
3631 oparams = memdup_user(_oparams, sizeof(*oparams));
3632 if (IS_ERR(oparams)) {
3633 err = PTR_ERR(oparams);
3634 goto out;
3635 }
3636 snd_pcm_hw_convert_from_old_params(params, oparams);
3637 err = snd_pcm_hw_params(substream, params);
3638 snd_pcm_hw_convert_to_old_params(oparams, params);
3639 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3640 if (!err)
3641 err = -EFAULT;
3642 }
3643
3644 kfree(oparams);
3645 out:
3646 kfree(params);
3647 return err;
3648 }
3649 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3650
3651 #ifndef CONFIG_MMU
snd_pcm_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)3652 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3653 unsigned long addr,
3654 unsigned long len,
3655 unsigned long pgoff,
3656 unsigned long flags)
3657 {
3658 struct snd_pcm_file *pcm_file = file->private_data;
3659 struct snd_pcm_substream *substream = pcm_file->substream;
3660 struct snd_pcm_runtime *runtime = substream->runtime;
3661 unsigned long offset = pgoff << PAGE_SHIFT;
3662
3663 switch (offset) {
3664 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3665 return (unsigned long)runtime->status;
3666 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3667 return (unsigned long)runtime->control;
3668 default:
3669 return (unsigned long)runtime->dma_area + offset;
3670 }
3671 }
3672 #else
3673 # define snd_pcm_get_unmapped_area NULL
3674 #endif
3675
3676 /*
3677 * Register section
3678 */
3679
3680 const struct file_operations snd_pcm_f_ops[2] = {
3681 {
3682 .owner = THIS_MODULE,
3683 .write = snd_pcm_write,
3684 .write_iter = snd_pcm_writev,
3685 .open = snd_pcm_playback_open,
3686 .release = snd_pcm_release,
3687 .llseek = no_llseek,
3688 .poll = snd_pcm_playback_poll,
3689 .unlocked_ioctl = snd_pcm_playback_ioctl,
3690 .compat_ioctl = snd_pcm_ioctl_compat,
3691 .mmap = snd_pcm_mmap,
3692 .fasync = snd_pcm_fasync,
3693 .get_unmapped_area = snd_pcm_get_unmapped_area,
3694 },
3695 {
3696 .owner = THIS_MODULE,
3697 .read = snd_pcm_read,
3698 .read_iter = snd_pcm_readv,
3699 .open = snd_pcm_capture_open,
3700 .release = snd_pcm_release,
3701 .llseek = no_llseek,
3702 .poll = snd_pcm_capture_poll,
3703 .unlocked_ioctl = snd_pcm_capture_ioctl,
3704 .compat_ioctl = snd_pcm_ioctl_compat,
3705 .mmap = snd_pcm_mmap,
3706 .fasync = snd_pcm_fasync,
3707 .get_unmapped_area = snd_pcm_get_unmapped_area,
3708 }
3709 };
3710