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_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)501 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
502 struct snd_pcm_hw_params *params)
503 {
504 struct snd_pcm_runtime *runtime;
505 int err, usecs;
506 unsigned int bits;
507 snd_pcm_uframes_t frames;
508
509 if (PCM_RUNTIME_CHECK(substream))
510 return -ENXIO;
511 runtime = substream->runtime;
512 snd_pcm_stream_lock_irq(substream);
513 switch (runtime->status->state) {
514 case SNDRV_PCM_STATE_OPEN:
515 case SNDRV_PCM_STATE_SETUP:
516 case SNDRV_PCM_STATE_PREPARED:
517 break;
518 default:
519 snd_pcm_stream_unlock_irq(substream);
520 return -EBADFD;
521 }
522 snd_pcm_stream_unlock_irq(substream);
523 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
524 if (!substream->oss.oss)
525 #endif
526 if (atomic_read(&substream->mmap_count))
527 return -EBADFD;
528
529 params->rmask = ~0U;
530 err = snd_pcm_hw_refine(substream, params);
531 if (err < 0)
532 goto _error;
533
534 err = snd_pcm_hw_params_choose(substream, params);
535 if (err < 0)
536 goto _error;
537
538 if (substream->ops->hw_params != NULL) {
539 err = substream->ops->hw_params(substream, params);
540 if (err < 0)
541 goto _error;
542 }
543
544 runtime->access = params_access(params);
545 runtime->format = params_format(params);
546 runtime->subformat = params_subformat(params);
547 runtime->channels = params_channels(params);
548 runtime->rate = params_rate(params);
549 runtime->period_size = params_period_size(params);
550 runtime->periods = params_periods(params);
551 runtime->buffer_size = params_buffer_size(params);
552 runtime->info = params->info;
553 runtime->rate_num = params->rate_num;
554 runtime->rate_den = params->rate_den;
555 runtime->no_period_wakeup =
556 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
557 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
558
559 bits = snd_pcm_format_physical_width(runtime->format);
560 runtime->sample_bits = bits;
561 bits *= runtime->channels;
562 runtime->frame_bits = bits;
563 frames = 1;
564 while (bits % 8 != 0) {
565 bits *= 2;
566 frames *= 2;
567 }
568 runtime->byte_align = bits / 8;
569 runtime->min_align = frames;
570
571 /* Default sw params */
572 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
573 runtime->period_step = 1;
574 runtime->control->avail_min = runtime->period_size;
575 runtime->start_threshold = 1;
576 runtime->stop_threshold = runtime->buffer_size;
577 runtime->silence_threshold = 0;
578 runtime->silence_size = 0;
579 runtime->boundary = runtime->buffer_size;
580 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
581 runtime->boundary *= 2;
582
583 snd_pcm_timer_resolution_change(substream);
584 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
585
586 if (pm_qos_request_active(&substream->latency_pm_qos_req))
587 pm_qos_remove_request(&substream->latency_pm_qos_req);
588 if ((usecs = period_to_usecs(runtime)) >= 0)
589 pm_qos_add_request(&substream->latency_pm_qos_req,
590 PM_QOS_CPU_DMA_LATENCY, usecs);
591 return 0;
592 _error:
593 /* hardware might be unusable from this time,
594 so we force application to retry to set
595 the correct hardware parameter settings */
596 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
597 if (substream->ops->hw_free != NULL)
598 substream->ops->hw_free(substream);
599 return err;
600 }
601
snd_pcm_hw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)602 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
603 struct snd_pcm_hw_params __user * _params)
604 {
605 struct snd_pcm_hw_params *params;
606 int err;
607
608 params = memdup_user(_params, sizeof(*params));
609 if (IS_ERR(params))
610 return PTR_ERR(params);
611
612 err = snd_pcm_hw_params(substream, params);
613 if (copy_to_user(_params, params, sizeof(*params))) {
614 if (!err)
615 err = -EFAULT;
616 }
617
618 kfree(params);
619 return err;
620 }
621
snd_pcm_hw_free(struct snd_pcm_substream * substream)622 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
623 {
624 struct snd_pcm_runtime *runtime;
625 int result = 0;
626
627 if (PCM_RUNTIME_CHECK(substream))
628 return -ENXIO;
629 runtime = substream->runtime;
630 snd_pcm_stream_lock_irq(substream);
631 switch (runtime->status->state) {
632 case SNDRV_PCM_STATE_SETUP:
633 case SNDRV_PCM_STATE_PREPARED:
634 break;
635 default:
636 snd_pcm_stream_unlock_irq(substream);
637 return -EBADFD;
638 }
639 snd_pcm_stream_unlock_irq(substream);
640 if (atomic_read(&substream->mmap_count))
641 return -EBADFD;
642 if (substream->ops->hw_free)
643 result = substream->ops->hw_free(substream);
644 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
645 pm_qos_remove_request(&substream->latency_pm_qos_req);
646 return result;
647 }
648
snd_pcm_sw_params(struct snd_pcm_substream * substream,struct snd_pcm_sw_params * params)649 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
650 struct snd_pcm_sw_params *params)
651 {
652 struct snd_pcm_runtime *runtime;
653 int err;
654
655 if (PCM_RUNTIME_CHECK(substream))
656 return -ENXIO;
657 runtime = substream->runtime;
658 snd_pcm_stream_lock_irq(substream);
659 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
660 snd_pcm_stream_unlock_irq(substream);
661 return -EBADFD;
662 }
663 snd_pcm_stream_unlock_irq(substream);
664
665 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
666 return -EINVAL;
667 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
668 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
669 return -EINVAL;
670 if (params->avail_min == 0)
671 return -EINVAL;
672 if (params->silence_size >= runtime->boundary) {
673 if (params->silence_threshold != 0)
674 return -EINVAL;
675 } else {
676 if (params->silence_size > params->silence_threshold)
677 return -EINVAL;
678 if (params->silence_threshold > runtime->buffer_size)
679 return -EINVAL;
680 }
681 err = 0;
682 snd_pcm_stream_lock_irq(substream);
683 runtime->tstamp_mode = params->tstamp_mode;
684 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
685 runtime->tstamp_type = params->tstamp_type;
686 runtime->period_step = params->period_step;
687 runtime->control->avail_min = params->avail_min;
688 runtime->start_threshold = params->start_threshold;
689 runtime->stop_threshold = params->stop_threshold;
690 runtime->silence_threshold = params->silence_threshold;
691 runtime->silence_size = params->silence_size;
692 params->boundary = runtime->boundary;
693 if (snd_pcm_running(substream)) {
694 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
695 runtime->silence_size > 0)
696 snd_pcm_playback_silence(substream, ULONG_MAX);
697 err = snd_pcm_update_state(substream, runtime);
698 }
699 snd_pcm_stream_unlock_irq(substream);
700 return err;
701 }
702
snd_pcm_sw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_sw_params __user * _params)703 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
704 struct snd_pcm_sw_params __user * _params)
705 {
706 struct snd_pcm_sw_params params;
707 int err;
708 if (copy_from_user(¶ms, _params, sizeof(params)))
709 return -EFAULT;
710 err = snd_pcm_sw_params(substream, ¶ms);
711 if (copy_to_user(_params, ¶ms, sizeof(params)))
712 return -EFAULT;
713 return err;
714 }
715
snd_pcm_status(struct snd_pcm_substream * substream,struct snd_pcm_status * status)716 int snd_pcm_status(struct snd_pcm_substream *substream,
717 struct snd_pcm_status *status)
718 {
719 struct snd_pcm_runtime *runtime = substream->runtime;
720
721 snd_pcm_stream_lock_irq(substream);
722
723 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
724 &runtime->audio_tstamp_config);
725
726 /* backwards compatible behavior */
727 if (runtime->audio_tstamp_config.type_requested ==
728 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
729 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
730 runtime->audio_tstamp_config.type_requested =
731 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
732 else
733 runtime->audio_tstamp_config.type_requested =
734 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
735 runtime->audio_tstamp_report.valid = 0;
736 } else
737 runtime->audio_tstamp_report.valid = 1;
738
739 status->state = runtime->status->state;
740 status->suspended_state = runtime->status->suspended_state;
741 if (status->state == SNDRV_PCM_STATE_OPEN)
742 goto _end;
743 status->trigger_tstamp = runtime->trigger_tstamp;
744 if (snd_pcm_running(substream)) {
745 snd_pcm_update_hw_ptr(substream);
746 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
747 status->tstamp = runtime->status->tstamp;
748 status->driver_tstamp = runtime->driver_tstamp;
749 status->audio_tstamp =
750 runtime->status->audio_tstamp;
751 if (runtime->audio_tstamp_report.valid == 1)
752 /* backwards compatibility, no report provided in COMPAT mode */
753 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
754 &status->audio_tstamp_accuracy,
755 &runtime->audio_tstamp_report);
756
757 goto _tstamp_end;
758 }
759 } else {
760 /* get tstamp only in fallback mode and only if enabled */
761 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
762 snd_pcm_gettime(runtime, &status->tstamp);
763 }
764 _tstamp_end:
765 status->appl_ptr = runtime->control->appl_ptr;
766 status->hw_ptr = runtime->status->hw_ptr;
767 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
768 status->avail = snd_pcm_playback_avail(runtime);
769 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
770 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
771 status->delay = runtime->buffer_size - status->avail;
772 status->delay += runtime->delay;
773 } else
774 status->delay = 0;
775 } else {
776 status->avail = snd_pcm_capture_avail(runtime);
777 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
778 status->delay = status->avail + runtime->delay;
779 else
780 status->delay = 0;
781 }
782 status->avail_max = runtime->avail_max;
783 status->overrange = runtime->overrange;
784 runtime->avail_max = 0;
785 runtime->overrange = 0;
786 _end:
787 snd_pcm_stream_unlock_irq(substream);
788 return 0;
789 }
790
snd_pcm_status_user(struct snd_pcm_substream * substream,struct snd_pcm_status __user * _status,bool ext)791 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
792 struct snd_pcm_status __user * _status,
793 bool ext)
794 {
795 struct snd_pcm_status status;
796 int res;
797
798 memset(&status, 0, sizeof(status));
799 /*
800 * with extension, parameters are read/write,
801 * get audio_tstamp_data from user,
802 * ignore rest of status structure
803 */
804 if (ext && get_user(status.audio_tstamp_data,
805 (u32 __user *)(&_status->audio_tstamp_data)))
806 return -EFAULT;
807 res = snd_pcm_status(substream, &status);
808 if (res < 0)
809 return res;
810 if (copy_to_user(_status, &status, sizeof(status)))
811 return -EFAULT;
812 return 0;
813 }
814
snd_pcm_channel_info(struct snd_pcm_substream * substream,struct snd_pcm_channel_info * info)815 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
816 struct snd_pcm_channel_info * info)
817 {
818 struct snd_pcm_runtime *runtime;
819 unsigned int channel;
820
821 channel = info->channel;
822 runtime = substream->runtime;
823 snd_pcm_stream_lock_irq(substream);
824 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
825 snd_pcm_stream_unlock_irq(substream);
826 return -EBADFD;
827 }
828 snd_pcm_stream_unlock_irq(substream);
829 if (channel >= runtime->channels)
830 return -EINVAL;
831 memset(info, 0, sizeof(*info));
832 info->channel = channel;
833 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
834 }
835
snd_pcm_channel_info_user(struct snd_pcm_substream * substream,struct snd_pcm_channel_info __user * _info)836 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
837 struct snd_pcm_channel_info __user * _info)
838 {
839 struct snd_pcm_channel_info info;
840 int res;
841
842 if (copy_from_user(&info, _info, sizeof(info)))
843 return -EFAULT;
844 res = snd_pcm_channel_info(substream, &info);
845 if (res < 0)
846 return res;
847 if (copy_to_user(_info, &info, sizeof(info)))
848 return -EFAULT;
849 return 0;
850 }
851
snd_pcm_trigger_tstamp(struct snd_pcm_substream * substream)852 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
853 {
854 struct snd_pcm_runtime *runtime = substream->runtime;
855 if (runtime->trigger_master == NULL)
856 return;
857 if (runtime->trigger_master == substream) {
858 if (!runtime->trigger_tstamp_latched)
859 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
860 } else {
861 snd_pcm_trigger_tstamp(runtime->trigger_master);
862 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
863 }
864 runtime->trigger_master = NULL;
865 }
866
867 struct action_ops {
868 int (*pre_action)(struct snd_pcm_substream *substream, int state);
869 int (*do_action)(struct snd_pcm_substream *substream, int state);
870 void (*undo_action)(struct snd_pcm_substream *substream, int state);
871 void (*post_action)(struct snd_pcm_substream *substream, int state);
872 };
873
874 /*
875 * this functions is core for handling of linked stream
876 * Note: the stream state might be changed also on failure
877 * Note2: call with calling stream lock + link lock
878 */
snd_pcm_action_group(struct action_ops * ops,struct snd_pcm_substream * substream,int state,int do_lock)879 static int snd_pcm_action_group(struct action_ops *ops,
880 struct snd_pcm_substream *substream,
881 int state, int do_lock)
882 {
883 struct snd_pcm_substream *s = NULL;
884 struct snd_pcm_substream *s1;
885 int res = 0, depth = 1;
886
887 snd_pcm_group_for_each_entry(s, substream) {
888 if (do_lock && s != substream) {
889 if (s->pcm->nonatomic)
890 mutex_lock_nested(&s->self_group.mutex, depth);
891 else
892 spin_lock_nested(&s->self_group.lock, depth);
893 depth++;
894 }
895 res = ops->pre_action(s, state);
896 if (res < 0)
897 goto _unlock;
898 }
899 snd_pcm_group_for_each_entry(s, substream) {
900 res = ops->do_action(s, state);
901 if (res < 0) {
902 if (ops->undo_action) {
903 snd_pcm_group_for_each_entry(s1, substream) {
904 if (s1 == s) /* failed stream */
905 break;
906 ops->undo_action(s1, state);
907 }
908 }
909 s = NULL; /* unlock all */
910 goto _unlock;
911 }
912 }
913 snd_pcm_group_for_each_entry(s, substream) {
914 ops->post_action(s, state);
915 }
916 _unlock:
917 if (do_lock) {
918 /* unlock streams */
919 snd_pcm_group_for_each_entry(s1, substream) {
920 if (s1 != substream) {
921 if (s1->pcm->nonatomic)
922 mutex_unlock(&s1->self_group.mutex);
923 else
924 spin_unlock(&s1->self_group.lock);
925 }
926 if (s1 == s) /* end */
927 break;
928 }
929 }
930 return res;
931 }
932
933 /*
934 * Note: call with stream lock
935 */
snd_pcm_action_single(struct action_ops * ops,struct snd_pcm_substream * substream,int state)936 static int snd_pcm_action_single(struct action_ops *ops,
937 struct snd_pcm_substream *substream,
938 int state)
939 {
940 int res;
941
942 res = ops->pre_action(substream, state);
943 if (res < 0)
944 return res;
945 res = ops->do_action(substream, state);
946 if (res == 0)
947 ops->post_action(substream, state);
948 else if (ops->undo_action)
949 ops->undo_action(substream, state);
950 return res;
951 }
952
953 /*
954 * Note: call with stream lock
955 */
snd_pcm_action(struct action_ops * ops,struct snd_pcm_substream * substream,int state)956 static int snd_pcm_action(struct action_ops *ops,
957 struct snd_pcm_substream *substream,
958 int state)
959 {
960 int res;
961
962 if (!snd_pcm_stream_linked(substream))
963 return snd_pcm_action_single(ops, substream, state);
964
965 if (substream->pcm->nonatomic) {
966 if (!mutex_trylock(&substream->group->mutex)) {
967 mutex_unlock(&substream->self_group.mutex);
968 mutex_lock(&substream->group->mutex);
969 mutex_lock(&substream->self_group.mutex);
970 }
971 res = snd_pcm_action_group(ops, substream, state, 1);
972 mutex_unlock(&substream->group->mutex);
973 } else {
974 if (!spin_trylock(&substream->group->lock)) {
975 spin_unlock(&substream->self_group.lock);
976 spin_lock(&substream->group->lock);
977 spin_lock(&substream->self_group.lock);
978 }
979 res = snd_pcm_action_group(ops, substream, state, 1);
980 spin_unlock(&substream->group->lock);
981 }
982 return res;
983 }
984
985 /*
986 * Note: don't use any locks before
987 */
snd_pcm_action_lock_irq(struct action_ops * ops,struct snd_pcm_substream * substream,int state)988 static int snd_pcm_action_lock_irq(struct action_ops *ops,
989 struct snd_pcm_substream *substream,
990 int state)
991 {
992 int res;
993
994 snd_pcm_stream_lock_irq(substream);
995 res = snd_pcm_action(ops, substream, state);
996 snd_pcm_stream_unlock_irq(substream);
997 return res;
998 }
999
1000 /*
1001 */
snd_pcm_action_nonatomic(struct action_ops * ops,struct snd_pcm_substream * substream,int state)1002 static int snd_pcm_action_nonatomic(struct action_ops *ops,
1003 struct snd_pcm_substream *substream,
1004 int state)
1005 {
1006 int res;
1007
1008 down_read(&snd_pcm_link_rwsem);
1009 if (snd_pcm_stream_linked(substream))
1010 res = snd_pcm_action_group(ops, substream, state, 0);
1011 else
1012 res = snd_pcm_action_single(ops, substream, state);
1013 up_read(&snd_pcm_link_rwsem);
1014 return res;
1015 }
1016
1017 /*
1018 * start callbacks
1019 */
snd_pcm_pre_start(struct snd_pcm_substream * substream,int state)1020 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1021 {
1022 struct snd_pcm_runtime *runtime = substream->runtime;
1023 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1024 return -EBADFD;
1025 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1026 !snd_pcm_playback_data(substream))
1027 return -EPIPE;
1028 runtime->trigger_tstamp_latched = false;
1029 runtime->trigger_master = substream;
1030 return 0;
1031 }
1032
snd_pcm_do_start(struct snd_pcm_substream * substream,int state)1033 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1034 {
1035 if (substream->runtime->trigger_master != substream)
1036 return 0;
1037 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1038 }
1039
snd_pcm_undo_start(struct snd_pcm_substream * substream,int state)1040 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1041 {
1042 if (substream->runtime->trigger_master == substream)
1043 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1044 }
1045
snd_pcm_post_start(struct snd_pcm_substream * substream,int state)1046 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1047 {
1048 struct snd_pcm_runtime *runtime = substream->runtime;
1049 snd_pcm_trigger_tstamp(substream);
1050 runtime->hw_ptr_jiffies = jiffies;
1051 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1052 runtime->rate;
1053 runtime->status->state = state;
1054 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1055 runtime->silence_size > 0)
1056 snd_pcm_playback_silence(substream, ULONG_MAX);
1057 if (substream->timer)
1058 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
1059 &runtime->trigger_tstamp);
1060 }
1061
1062 static struct action_ops snd_pcm_action_start = {
1063 .pre_action = snd_pcm_pre_start,
1064 .do_action = snd_pcm_do_start,
1065 .undo_action = snd_pcm_undo_start,
1066 .post_action = snd_pcm_post_start
1067 };
1068
1069 /**
1070 * snd_pcm_start - start all linked streams
1071 * @substream: the PCM substream instance
1072 *
1073 * Return: Zero if successful, or a negative error code.
1074 */
snd_pcm_start(struct snd_pcm_substream * substream)1075 int snd_pcm_start(struct snd_pcm_substream *substream)
1076 {
1077 return snd_pcm_action(&snd_pcm_action_start, substream,
1078 SNDRV_PCM_STATE_RUNNING);
1079 }
1080
1081 /*
1082 * stop callbacks
1083 */
snd_pcm_pre_stop(struct snd_pcm_substream * substream,int state)1084 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1085 {
1086 struct snd_pcm_runtime *runtime = substream->runtime;
1087 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1088 return -EBADFD;
1089 runtime->trigger_master = substream;
1090 return 0;
1091 }
1092
snd_pcm_do_stop(struct snd_pcm_substream * substream,int state)1093 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1094 {
1095 if (substream->runtime->trigger_master == substream &&
1096 snd_pcm_running(substream))
1097 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1098 return 0; /* unconditonally stop all substreams */
1099 }
1100
snd_pcm_post_stop(struct snd_pcm_substream * substream,int state)1101 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1102 {
1103 struct snd_pcm_runtime *runtime = substream->runtime;
1104 if (runtime->status->state != state) {
1105 snd_pcm_trigger_tstamp(substream);
1106 runtime->status->state = state;
1107 if (substream->timer)
1108 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
1109 &runtime->trigger_tstamp);
1110 }
1111 wake_up(&runtime->sleep);
1112 wake_up(&runtime->tsleep);
1113 }
1114
1115 static struct action_ops snd_pcm_action_stop = {
1116 .pre_action = snd_pcm_pre_stop,
1117 .do_action = snd_pcm_do_stop,
1118 .post_action = snd_pcm_post_stop
1119 };
1120
1121 /**
1122 * snd_pcm_stop - try to stop all running streams in the substream group
1123 * @substream: the PCM substream instance
1124 * @state: PCM state after stopping the stream
1125 *
1126 * The state of each stream is then changed to the given state unconditionally.
1127 *
1128 * Return: Zero if successful, or a negative error code.
1129 */
snd_pcm_stop(struct snd_pcm_substream * substream,snd_pcm_state_t state)1130 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1131 {
1132 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1133 }
1134
1135 EXPORT_SYMBOL(snd_pcm_stop);
1136
1137 /**
1138 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1139 * @substream: the PCM substream
1140 *
1141 * After stopping, the state is changed to SETUP.
1142 * Unlike snd_pcm_stop(), this affects only the given stream.
1143 *
1144 * Return: Zero if succesful, or a negative error code.
1145 */
snd_pcm_drain_done(struct snd_pcm_substream * substream)1146 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1147 {
1148 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1149 SNDRV_PCM_STATE_SETUP);
1150 }
1151
1152 /**
1153 * snd_pcm_stop_xrun - stop the running streams as XRUN
1154 * @substream: the PCM substream instance
1155 *
1156 * This stops the given running substream (and all linked substreams) as XRUN.
1157 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1158 *
1159 * Return: Zero if successful, or a negative error code.
1160 */
snd_pcm_stop_xrun(struct snd_pcm_substream * substream)1161 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1162 {
1163 unsigned long flags;
1164 int ret = 0;
1165
1166 snd_pcm_stream_lock_irqsave(substream, flags);
1167 if (snd_pcm_running(substream))
1168 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1169 snd_pcm_stream_unlock_irqrestore(substream, flags);
1170 return ret;
1171 }
1172 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1173
1174 /*
1175 * pause callbacks
1176 */
snd_pcm_pre_pause(struct snd_pcm_substream * substream,int push)1177 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1178 {
1179 struct snd_pcm_runtime *runtime = substream->runtime;
1180 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1181 return -ENOSYS;
1182 if (push) {
1183 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1184 return -EBADFD;
1185 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1186 return -EBADFD;
1187 runtime->trigger_master = substream;
1188 return 0;
1189 }
1190
snd_pcm_do_pause(struct snd_pcm_substream * substream,int push)1191 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1192 {
1193 if (substream->runtime->trigger_master != substream)
1194 return 0;
1195 /* some drivers might use hw_ptr to recover from the pause -
1196 update the hw_ptr now */
1197 if (push)
1198 snd_pcm_update_hw_ptr(substream);
1199 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1200 * a delta between the current jiffies, this gives a large enough
1201 * delta, effectively to skip the check once.
1202 */
1203 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1204 return substream->ops->trigger(substream,
1205 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1206 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1207 }
1208
snd_pcm_undo_pause(struct snd_pcm_substream * substream,int push)1209 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1210 {
1211 if (substream->runtime->trigger_master == substream)
1212 substream->ops->trigger(substream,
1213 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1214 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1215 }
1216
snd_pcm_post_pause(struct snd_pcm_substream * substream,int push)1217 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1218 {
1219 struct snd_pcm_runtime *runtime = substream->runtime;
1220 snd_pcm_trigger_tstamp(substream);
1221 if (push) {
1222 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1223 if (substream->timer)
1224 snd_timer_notify(substream->timer,
1225 SNDRV_TIMER_EVENT_MPAUSE,
1226 &runtime->trigger_tstamp);
1227 wake_up(&runtime->sleep);
1228 wake_up(&runtime->tsleep);
1229 } else {
1230 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1231 if (substream->timer)
1232 snd_timer_notify(substream->timer,
1233 SNDRV_TIMER_EVENT_MCONTINUE,
1234 &runtime->trigger_tstamp);
1235 }
1236 }
1237
1238 static struct action_ops snd_pcm_action_pause = {
1239 .pre_action = snd_pcm_pre_pause,
1240 .do_action = snd_pcm_do_pause,
1241 .undo_action = snd_pcm_undo_pause,
1242 .post_action = snd_pcm_post_pause
1243 };
1244
1245 /*
1246 * Push/release the pause for all linked streams.
1247 */
snd_pcm_pause(struct snd_pcm_substream * substream,int push)1248 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1249 {
1250 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1251 }
1252
1253 #ifdef CONFIG_PM
1254 /* suspend */
1255
snd_pcm_pre_suspend(struct snd_pcm_substream * substream,int state)1256 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1257 {
1258 struct snd_pcm_runtime *runtime = substream->runtime;
1259 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1260 return -EBUSY;
1261 runtime->trigger_master = substream;
1262 return 0;
1263 }
1264
snd_pcm_do_suspend(struct snd_pcm_substream * substream,int state)1265 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1266 {
1267 struct snd_pcm_runtime *runtime = substream->runtime;
1268 if (runtime->trigger_master != substream)
1269 return 0;
1270 if (! snd_pcm_running(substream))
1271 return 0;
1272 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1273 return 0; /* suspend unconditionally */
1274 }
1275
snd_pcm_post_suspend(struct snd_pcm_substream * substream,int state)1276 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1277 {
1278 struct snd_pcm_runtime *runtime = substream->runtime;
1279 snd_pcm_trigger_tstamp(substream);
1280 runtime->status->suspended_state = runtime->status->state;
1281 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1282 if (substream->timer)
1283 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1284 &runtime->trigger_tstamp);
1285 wake_up(&runtime->sleep);
1286 wake_up(&runtime->tsleep);
1287 }
1288
1289 static struct action_ops snd_pcm_action_suspend = {
1290 .pre_action = snd_pcm_pre_suspend,
1291 .do_action = snd_pcm_do_suspend,
1292 .post_action = snd_pcm_post_suspend
1293 };
1294
1295 /**
1296 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1297 * @substream: the PCM substream
1298 *
1299 * After this call, all streams are changed to SUSPENDED state.
1300 *
1301 * Return: Zero if successful (or @substream is %NULL), or a negative error
1302 * code.
1303 */
snd_pcm_suspend(struct snd_pcm_substream * substream)1304 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1305 {
1306 int err;
1307 unsigned long flags;
1308
1309 if (! substream)
1310 return 0;
1311
1312 snd_pcm_stream_lock_irqsave(substream, flags);
1313 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1314 snd_pcm_stream_unlock_irqrestore(substream, flags);
1315 return err;
1316 }
1317
1318 EXPORT_SYMBOL(snd_pcm_suspend);
1319
1320 /**
1321 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1322 * @pcm: the PCM instance
1323 *
1324 * After this call, all streams are changed to SUSPENDED state.
1325 *
1326 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1327 */
snd_pcm_suspend_all(struct snd_pcm * pcm)1328 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1329 {
1330 struct snd_pcm_substream *substream;
1331 int stream, err = 0;
1332
1333 if (! pcm)
1334 return 0;
1335
1336 for (stream = 0; stream < 2; stream++) {
1337 for (substream = pcm->streams[stream].substream;
1338 substream; substream = substream->next) {
1339 /* FIXME: the open/close code should lock this as well */
1340 if (substream->runtime == NULL)
1341 continue;
1342 err = snd_pcm_suspend(substream);
1343 if (err < 0 && err != -EBUSY)
1344 return err;
1345 }
1346 }
1347 return 0;
1348 }
1349
1350 EXPORT_SYMBOL(snd_pcm_suspend_all);
1351
1352 /* resume */
1353
snd_pcm_pre_resume(struct snd_pcm_substream * substream,int state)1354 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1355 {
1356 struct snd_pcm_runtime *runtime = substream->runtime;
1357 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1358 return -ENOSYS;
1359 runtime->trigger_master = substream;
1360 return 0;
1361 }
1362
snd_pcm_do_resume(struct snd_pcm_substream * substream,int state)1363 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1364 {
1365 struct snd_pcm_runtime *runtime = substream->runtime;
1366 if (runtime->trigger_master != substream)
1367 return 0;
1368 /* DMA not running previously? */
1369 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1370 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1371 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1372 return 0;
1373 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1374 }
1375
snd_pcm_undo_resume(struct snd_pcm_substream * substream,int state)1376 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1377 {
1378 if (substream->runtime->trigger_master == substream &&
1379 snd_pcm_running(substream))
1380 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1381 }
1382
snd_pcm_post_resume(struct snd_pcm_substream * substream,int state)1383 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1384 {
1385 struct snd_pcm_runtime *runtime = substream->runtime;
1386 snd_pcm_trigger_tstamp(substream);
1387 runtime->status->state = runtime->status->suspended_state;
1388 if (substream->timer)
1389 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1390 &runtime->trigger_tstamp);
1391 }
1392
1393 static struct action_ops snd_pcm_action_resume = {
1394 .pre_action = snd_pcm_pre_resume,
1395 .do_action = snd_pcm_do_resume,
1396 .undo_action = snd_pcm_undo_resume,
1397 .post_action = snd_pcm_post_resume
1398 };
1399
snd_pcm_resume(struct snd_pcm_substream * substream)1400 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1401 {
1402 struct snd_card *card = substream->pcm->card;
1403 int res;
1404
1405 snd_power_lock(card);
1406 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1407 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1408 snd_power_unlock(card);
1409 return res;
1410 }
1411
1412 #else
1413
snd_pcm_resume(struct snd_pcm_substream * substream)1414 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1415 {
1416 return -ENOSYS;
1417 }
1418
1419 #endif /* CONFIG_PM */
1420
1421 /*
1422 * xrun ioctl
1423 *
1424 * Change the RUNNING stream(s) to XRUN state.
1425 */
snd_pcm_xrun(struct snd_pcm_substream * substream)1426 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1427 {
1428 struct snd_card *card = substream->pcm->card;
1429 struct snd_pcm_runtime *runtime = substream->runtime;
1430 int result;
1431
1432 snd_power_lock(card);
1433 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1434 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1435 if (result < 0)
1436 goto _unlock;
1437 }
1438
1439 snd_pcm_stream_lock_irq(substream);
1440 switch (runtime->status->state) {
1441 case SNDRV_PCM_STATE_XRUN:
1442 result = 0; /* already there */
1443 break;
1444 case SNDRV_PCM_STATE_RUNNING:
1445 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1446 break;
1447 default:
1448 result = -EBADFD;
1449 }
1450 snd_pcm_stream_unlock_irq(substream);
1451 _unlock:
1452 snd_power_unlock(card);
1453 return result;
1454 }
1455
1456 /*
1457 * reset ioctl
1458 */
snd_pcm_pre_reset(struct snd_pcm_substream * substream,int state)1459 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1460 {
1461 struct snd_pcm_runtime *runtime = substream->runtime;
1462 switch (runtime->status->state) {
1463 case SNDRV_PCM_STATE_RUNNING:
1464 case SNDRV_PCM_STATE_PREPARED:
1465 case SNDRV_PCM_STATE_PAUSED:
1466 case SNDRV_PCM_STATE_SUSPENDED:
1467 return 0;
1468 default:
1469 return -EBADFD;
1470 }
1471 }
1472
snd_pcm_do_reset(struct snd_pcm_substream * substream,int state)1473 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1474 {
1475 struct snd_pcm_runtime *runtime = substream->runtime;
1476 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1477 if (err < 0)
1478 return err;
1479 runtime->hw_ptr_base = 0;
1480 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1481 runtime->status->hw_ptr % runtime->period_size;
1482 runtime->silence_start = runtime->status->hw_ptr;
1483 runtime->silence_filled = 0;
1484 return 0;
1485 }
1486
snd_pcm_post_reset(struct snd_pcm_substream * substream,int state)1487 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1488 {
1489 struct snd_pcm_runtime *runtime = substream->runtime;
1490 runtime->control->appl_ptr = runtime->status->hw_ptr;
1491 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1492 runtime->silence_size > 0)
1493 snd_pcm_playback_silence(substream, ULONG_MAX);
1494 }
1495
1496 static struct action_ops snd_pcm_action_reset = {
1497 .pre_action = snd_pcm_pre_reset,
1498 .do_action = snd_pcm_do_reset,
1499 .post_action = snd_pcm_post_reset
1500 };
1501
snd_pcm_reset(struct snd_pcm_substream * substream)1502 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1503 {
1504 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1505 }
1506
1507 /*
1508 * prepare ioctl
1509 */
1510 /* we use the second argument for updating f_flags */
snd_pcm_pre_prepare(struct snd_pcm_substream * substream,int f_flags)1511 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1512 int f_flags)
1513 {
1514 struct snd_pcm_runtime *runtime = substream->runtime;
1515 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1516 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1517 return -EBADFD;
1518 if (snd_pcm_running(substream))
1519 return -EBUSY;
1520 substream->f_flags = f_flags;
1521 return 0;
1522 }
1523
snd_pcm_do_prepare(struct snd_pcm_substream * substream,int state)1524 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1525 {
1526 int err;
1527 err = substream->ops->prepare(substream);
1528 if (err < 0)
1529 return err;
1530 return snd_pcm_do_reset(substream, 0);
1531 }
1532
snd_pcm_post_prepare(struct snd_pcm_substream * substream,int state)1533 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1534 {
1535 struct snd_pcm_runtime *runtime = substream->runtime;
1536 runtime->control->appl_ptr = runtime->status->hw_ptr;
1537 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1538 }
1539
1540 static struct action_ops snd_pcm_action_prepare = {
1541 .pre_action = snd_pcm_pre_prepare,
1542 .do_action = snd_pcm_do_prepare,
1543 .post_action = snd_pcm_post_prepare
1544 };
1545
1546 /**
1547 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1548 * @substream: the PCM substream instance
1549 * @file: file to refer f_flags
1550 *
1551 * Return: Zero if successful, or a negative error code.
1552 */
snd_pcm_prepare(struct snd_pcm_substream * substream,struct file * file)1553 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1554 struct file *file)
1555 {
1556 int res;
1557 struct snd_card *card = substream->pcm->card;
1558 int f_flags;
1559
1560 if (file)
1561 f_flags = file->f_flags;
1562 else
1563 f_flags = substream->f_flags;
1564
1565 snd_power_lock(card);
1566 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1567 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1568 substream, f_flags);
1569 snd_power_unlock(card);
1570 return res;
1571 }
1572
1573 /*
1574 * drain ioctl
1575 */
1576
snd_pcm_pre_drain_init(struct snd_pcm_substream * substream,int state)1577 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1578 {
1579 struct snd_pcm_runtime *runtime = substream->runtime;
1580 switch (runtime->status->state) {
1581 case SNDRV_PCM_STATE_OPEN:
1582 case SNDRV_PCM_STATE_DISCONNECTED:
1583 case SNDRV_PCM_STATE_SUSPENDED:
1584 return -EBADFD;
1585 }
1586 runtime->trigger_master = substream;
1587 return 0;
1588 }
1589
snd_pcm_do_drain_init(struct snd_pcm_substream * substream,int state)1590 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1591 {
1592 struct snd_pcm_runtime *runtime = substream->runtime;
1593 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1594 switch (runtime->status->state) {
1595 case SNDRV_PCM_STATE_PREPARED:
1596 /* start playback stream if possible */
1597 if (! snd_pcm_playback_empty(substream)) {
1598 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1599 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1600 } else {
1601 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1602 }
1603 break;
1604 case SNDRV_PCM_STATE_RUNNING:
1605 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1606 break;
1607 case SNDRV_PCM_STATE_XRUN:
1608 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1609 break;
1610 default:
1611 break;
1612 }
1613 } else {
1614 /* stop running stream */
1615 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1616 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1617 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1618 snd_pcm_do_stop(substream, new_state);
1619 snd_pcm_post_stop(substream, new_state);
1620 }
1621 }
1622
1623 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1624 runtime->trigger_master == substream &&
1625 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1626 return substream->ops->trigger(substream,
1627 SNDRV_PCM_TRIGGER_DRAIN);
1628
1629 return 0;
1630 }
1631
snd_pcm_post_drain_init(struct snd_pcm_substream * substream,int state)1632 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1633 {
1634 }
1635
1636 static struct action_ops snd_pcm_action_drain_init = {
1637 .pre_action = snd_pcm_pre_drain_init,
1638 .do_action = snd_pcm_do_drain_init,
1639 .post_action = snd_pcm_post_drain_init
1640 };
1641
1642 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1643
1644 /*
1645 * Drain the stream(s).
1646 * When the substream is linked, sync until the draining of all playback streams
1647 * is finished.
1648 * After this call, all streams are supposed to be either SETUP or DRAINING
1649 * (capture only) state.
1650 */
snd_pcm_drain(struct snd_pcm_substream * substream,struct file * file)1651 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1652 struct file *file)
1653 {
1654 struct snd_card *card;
1655 struct snd_pcm_runtime *runtime;
1656 struct snd_pcm_substream *s;
1657 wait_queue_t wait;
1658 int result = 0;
1659 int nonblock = 0;
1660
1661 card = substream->pcm->card;
1662 runtime = substream->runtime;
1663
1664 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1665 return -EBADFD;
1666
1667 snd_power_lock(card);
1668 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1669 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1670 if (result < 0) {
1671 snd_power_unlock(card);
1672 return result;
1673 }
1674 }
1675
1676 if (file) {
1677 if (file->f_flags & O_NONBLOCK)
1678 nonblock = 1;
1679 } else if (substream->f_flags & O_NONBLOCK)
1680 nonblock = 1;
1681
1682 down_read(&snd_pcm_link_rwsem);
1683 snd_pcm_stream_lock_irq(substream);
1684 /* resume pause */
1685 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1686 snd_pcm_pause(substream, 0);
1687
1688 /* pre-start/stop - all running streams are changed to DRAINING state */
1689 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1690 if (result < 0)
1691 goto unlock;
1692 /* in non-blocking, we don't wait in ioctl but let caller poll */
1693 if (nonblock) {
1694 result = -EAGAIN;
1695 goto unlock;
1696 }
1697
1698 for (;;) {
1699 long tout;
1700 struct snd_pcm_runtime *to_check;
1701 if (signal_pending(current)) {
1702 result = -ERESTARTSYS;
1703 break;
1704 }
1705 /* find a substream to drain */
1706 to_check = NULL;
1707 snd_pcm_group_for_each_entry(s, substream) {
1708 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1709 continue;
1710 runtime = s->runtime;
1711 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1712 to_check = runtime;
1713 break;
1714 }
1715 }
1716 if (!to_check)
1717 break; /* all drained */
1718 init_waitqueue_entry(&wait, current);
1719 add_wait_queue(&to_check->sleep, &wait);
1720 snd_pcm_stream_unlock_irq(substream);
1721 up_read(&snd_pcm_link_rwsem);
1722 snd_power_unlock(card);
1723 if (runtime->no_period_wakeup)
1724 tout = MAX_SCHEDULE_TIMEOUT;
1725 else {
1726 tout = 10;
1727 if (runtime->rate) {
1728 long t = runtime->period_size * 2 / runtime->rate;
1729 tout = max(t, tout);
1730 }
1731 tout = msecs_to_jiffies(tout * 1000);
1732 }
1733 tout = schedule_timeout_interruptible(tout);
1734 snd_power_lock(card);
1735 down_read(&snd_pcm_link_rwsem);
1736 snd_pcm_stream_lock_irq(substream);
1737 remove_wait_queue(&to_check->sleep, &wait);
1738 if (card->shutdown) {
1739 result = -ENODEV;
1740 break;
1741 }
1742 if (tout == 0) {
1743 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1744 result = -ESTRPIPE;
1745 else {
1746 dev_dbg(substream->pcm->card->dev,
1747 "playback drain error (DMA or IRQ trouble?)\n");
1748 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1749 result = -EIO;
1750 }
1751 break;
1752 }
1753 }
1754
1755 unlock:
1756 snd_pcm_stream_unlock_irq(substream);
1757 up_read(&snd_pcm_link_rwsem);
1758 snd_power_unlock(card);
1759
1760 return result;
1761 }
1762
1763 /*
1764 * drop ioctl
1765 *
1766 * Immediately put all linked substreams into SETUP state.
1767 */
snd_pcm_drop(struct snd_pcm_substream * substream)1768 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1769 {
1770 struct snd_pcm_runtime *runtime;
1771 int result = 0;
1772
1773 if (PCM_RUNTIME_CHECK(substream))
1774 return -ENXIO;
1775 runtime = substream->runtime;
1776
1777 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1778 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1779 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1780 return -EBADFD;
1781
1782 snd_pcm_stream_lock_irq(substream);
1783 /* resume pause */
1784 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1785 snd_pcm_pause(substream, 0);
1786
1787 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1788 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1789 snd_pcm_stream_unlock_irq(substream);
1790
1791 return result;
1792 }
1793
1794
is_pcm_file(struct file * file)1795 static bool is_pcm_file(struct file *file)
1796 {
1797 struct inode *inode = file_inode(file);
1798 unsigned int minor;
1799
1800 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1801 return false;
1802 minor = iminor(inode);
1803 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1804 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1805 }
1806
1807 /*
1808 * PCM link handling
1809 */
snd_pcm_link(struct snd_pcm_substream * substream,int fd)1810 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1811 {
1812 int res = 0;
1813 struct snd_pcm_file *pcm_file;
1814 struct snd_pcm_substream *substream1;
1815 struct snd_pcm_group *group;
1816 struct fd f = fdget(fd);
1817
1818 if (!f.file)
1819 return -EBADFD;
1820 if (!is_pcm_file(f.file)) {
1821 res = -EBADFD;
1822 goto _badf;
1823 }
1824 pcm_file = f.file->private_data;
1825 substream1 = pcm_file->substream;
1826 group = kmalloc(sizeof(*group), GFP_KERNEL);
1827 if (!group) {
1828 res = -ENOMEM;
1829 goto _nolock;
1830 }
1831 down_write_nonblock(&snd_pcm_link_rwsem);
1832 write_lock_irq(&snd_pcm_link_rwlock);
1833 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1834 substream->runtime->status->state != substream1->runtime->status->state ||
1835 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1836 res = -EBADFD;
1837 goto _end;
1838 }
1839 if (snd_pcm_stream_linked(substream1)) {
1840 res = -EALREADY;
1841 goto _end;
1842 }
1843 if (!snd_pcm_stream_linked(substream)) {
1844 substream->group = group;
1845 group = NULL;
1846 spin_lock_init(&substream->group->lock);
1847 mutex_init(&substream->group->mutex);
1848 INIT_LIST_HEAD(&substream->group->substreams);
1849 list_add_tail(&substream->link_list, &substream->group->substreams);
1850 substream->group->count = 1;
1851 }
1852 list_add_tail(&substream1->link_list, &substream->group->substreams);
1853 substream->group->count++;
1854 substream1->group = substream->group;
1855 _end:
1856 write_unlock_irq(&snd_pcm_link_rwlock);
1857 up_write(&snd_pcm_link_rwsem);
1858 _nolock:
1859 snd_card_unref(substream1->pcm->card);
1860 kfree(group);
1861 _badf:
1862 fdput(f);
1863 return res;
1864 }
1865
relink_to_local(struct snd_pcm_substream * substream)1866 static void relink_to_local(struct snd_pcm_substream *substream)
1867 {
1868 substream->group = &substream->self_group;
1869 INIT_LIST_HEAD(&substream->self_group.substreams);
1870 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1871 }
1872
snd_pcm_unlink(struct snd_pcm_substream * substream)1873 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1874 {
1875 struct snd_pcm_substream *s;
1876 int res = 0;
1877
1878 down_write_nonblock(&snd_pcm_link_rwsem);
1879 write_lock_irq(&snd_pcm_link_rwlock);
1880 if (!snd_pcm_stream_linked(substream)) {
1881 res = -EALREADY;
1882 goto _end;
1883 }
1884 list_del(&substream->link_list);
1885 substream->group->count--;
1886 if (substream->group->count == 1) { /* detach the last stream, too */
1887 snd_pcm_group_for_each_entry(s, substream) {
1888 relink_to_local(s);
1889 break;
1890 }
1891 kfree(substream->group);
1892 }
1893 relink_to_local(substream);
1894 _end:
1895 write_unlock_irq(&snd_pcm_link_rwlock);
1896 up_write(&snd_pcm_link_rwsem);
1897 return res;
1898 }
1899
1900 /*
1901 * hw configurator
1902 */
snd_pcm_hw_rule_mul(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1903 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1904 struct snd_pcm_hw_rule *rule)
1905 {
1906 struct snd_interval t;
1907 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1908 hw_param_interval_c(params, rule->deps[1]), &t);
1909 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1910 }
1911
snd_pcm_hw_rule_div(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1912 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1913 struct snd_pcm_hw_rule *rule)
1914 {
1915 struct snd_interval t;
1916 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1917 hw_param_interval_c(params, rule->deps[1]), &t);
1918 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1919 }
1920
snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1921 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1922 struct snd_pcm_hw_rule *rule)
1923 {
1924 struct snd_interval t;
1925 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1926 hw_param_interval_c(params, rule->deps[1]),
1927 (unsigned long) rule->private, &t);
1928 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1929 }
1930
snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1931 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1932 struct snd_pcm_hw_rule *rule)
1933 {
1934 struct snd_interval t;
1935 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1936 (unsigned long) rule->private,
1937 hw_param_interval_c(params, rule->deps[1]), &t);
1938 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1939 }
1940
snd_pcm_hw_rule_format(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1941 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1942 struct snd_pcm_hw_rule *rule)
1943 {
1944 unsigned int k;
1945 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1946 struct snd_mask m;
1947 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1948 snd_mask_any(&m);
1949 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1950 int bits;
1951 if (! snd_mask_test(mask, k))
1952 continue;
1953 bits = snd_pcm_format_physical_width(k);
1954 if (bits <= 0)
1955 continue; /* ignore invalid formats */
1956 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1957 snd_mask_reset(&m, k);
1958 }
1959 return snd_mask_refine(mask, &m);
1960 }
1961
snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1962 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1963 struct snd_pcm_hw_rule *rule)
1964 {
1965 struct snd_interval t;
1966 unsigned int k;
1967 t.min = UINT_MAX;
1968 t.max = 0;
1969 t.openmin = 0;
1970 t.openmax = 0;
1971 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1972 int bits;
1973 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1974 continue;
1975 bits = snd_pcm_format_physical_width(k);
1976 if (bits <= 0)
1977 continue; /* ignore invalid formats */
1978 if (t.min > (unsigned)bits)
1979 t.min = bits;
1980 if (t.max < (unsigned)bits)
1981 t.max = bits;
1982 }
1983 t.integer = 1;
1984 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1985 }
1986
1987 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1988 #error "Change this table"
1989 #endif
1990
1991 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1992 48000, 64000, 88200, 96000, 176400, 192000 };
1993
1994 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1995 .count = ARRAY_SIZE(rates),
1996 .list = rates,
1997 };
1998
snd_pcm_hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1999 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2000 struct snd_pcm_hw_rule *rule)
2001 {
2002 struct snd_pcm_hardware *hw = rule->private;
2003 return snd_interval_list(hw_param_interval(params, rule->var),
2004 snd_pcm_known_rates.count,
2005 snd_pcm_known_rates.list, hw->rates);
2006 }
2007
snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2008 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2009 struct snd_pcm_hw_rule *rule)
2010 {
2011 struct snd_interval t;
2012 struct snd_pcm_substream *substream = rule->private;
2013 t.min = 0;
2014 t.max = substream->buffer_bytes_max;
2015 t.openmin = 0;
2016 t.openmax = 0;
2017 t.integer = 1;
2018 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2019 }
2020
snd_pcm_hw_constraints_init(struct snd_pcm_substream * substream)2021 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2022 {
2023 struct snd_pcm_runtime *runtime = substream->runtime;
2024 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2025 int k, err;
2026
2027 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2028 snd_mask_any(constrs_mask(constrs, k));
2029 }
2030
2031 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2032 snd_interval_any(constrs_interval(constrs, k));
2033 }
2034
2035 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2036 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2037 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2038 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2039 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2040
2041 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2042 snd_pcm_hw_rule_format, NULL,
2043 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2044 if (err < 0)
2045 return err;
2046 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2047 snd_pcm_hw_rule_sample_bits, NULL,
2048 SNDRV_PCM_HW_PARAM_FORMAT,
2049 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2050 if (err < 0)
2051 return err;
2052 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2053 snd_pcm_hw_rule_div, NULL,
2054 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2055 if (err < 0)
2056 return err;
2057 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2058 snd_pcm_hw_rule_mul, NULL,
2059 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2060 if (err < 0)
2061 return err;
2062 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2063 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2064 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2065 if (err < 0)
2066 return err;
2067 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2068 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2069 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2070 if (err < 0)
2071 return err;
2072 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2073 snd_pcm_hw_rule_div, NULL,
2074 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2075 if (err < 0)
2076 return err;
2077 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2078 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2079 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2080 if (err < 0)
2081 return err;
2082 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2083 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2084 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2085 if (err < 0)
2086 return err;
2087 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2088 snd_pcm_hw_rule_div, NULL,
2089 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2090 if (err < 0)
2091 return err;
2092 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2093 snd_pcm_hw_rule_div, NULL,
2094 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2095 if (err < 0)
2096 return err;
2097 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2098 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2099 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2100 if (err < 0)
2101 return err;
2102 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2103 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2104 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2105 if (err < 0)
2106 return err;
2107 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2108 snd_pcm_hw_rule_mul, NULL,
2109 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2110 if (err < 0)
2111 return err;
2112 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2113 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2114 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2115 if (err < 0)
2116 return err;
2117 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2118 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2119 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2120 if (err < 0)
2121 return err;
2122 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2123 snd_pcm_hw_rule_muldivk, (void*) 8,
2124 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2125 if (err < 0)
2126 return err;
2127 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2128 snd_pcm_hw_rule_muldivk, (void*) 8,
2129 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2130 if (err < 0)
2131 return err;
2132 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2133 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2134 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2135 if (err < 0)
2136 return err;
2137 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2138 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2139 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2140 if (err < 0)
2141 return err;
2142 return 0;
2143 }
2144
snd_pcm_hw_constraints_complete(struct snd_pcm_substream * substream)2145 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2146 {
2147 struct snd_pcm_runtime *runtime = substream->runtime;
2148 struct snd_pcm_hardware *hw = &runtime->hw;
2149 int err;
2150 unsigned int mask = 0;
2151
2152 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2153 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2154 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2155 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2156 if (hw_support_mmap(substream)) {
2157 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2158 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2159 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2160 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2161 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2162 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2163 }
2164 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2165 if (err < 0)
2166 return err;
2167
2168 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2169 if (err < 0)
2170 return err;
2171
2172 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2173 if (err < 0)
2174 return err;
2175
2176 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2177 hw->channels_min, hw->channels_max);
2178 if (err < 0)
2179 return err;
2180
2181 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2182 hw->rate_min, hw->rate_max);
2183 if (err < 0)
2184 return err;
2185
2186 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2187 hw->period_bytes_min, hw->period_bytes_max);
2188 if (err < 0)
2189 return err;
2190
2191 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2192 hw->periods_min, hw->periods_max);
2193 if (err < 0)
2194 return err;
2195
2196 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2197 hw->period_bytes_min, hw->buffer_bytes_max);
2198 if (err < 0)
2199 return err;
2200
2201 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2202 snd_pcm_hw_rule_buffer_bytes_max, substream,
2203 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2204 if (err < 0)
2205 return err;
2206
2207 /* FIXME: remove */
2208 if (runtime->dma_bytes) {
2209 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2210 if (err < 0)
2211 return err;
2212 }
2213
2214 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2215 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2216 snd_pcm_hw_rule_rate, hw,
2217 SNDRV_PCM_HW_PARAM_RATE, -1);
2218 if (err < 0)
2219 return err;
2220 }
2221
2222 /* FIXME: this belong to lowlevel */
2223 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2224
2225 return 0;
2226 }
2227
pcm_release_private(struct snd_pcm_substream * substream)2228 static void pcm_release_private(struct snd_pcm_substream *substream)
2229 {
2230 snd_pcm_unlink(substream);
2231 }
2232
snd_pcm_release_substream(struct snd_pcm_substream * substream)2233 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2234 {
2235 substream->ref_count--;
2236 if (substream->ref_count > 0)
2237 return;
2238
2239 snd_pcm_drop(substream);
2240 if (substream->hw_opened) {
2241 if (substream->ops->hw_free != NULL)
2242 substream->ops->hw_free(substream);
2243 substream->ops->close(substream);
2244 substream->hw_opened = 0;
2245 }
2246 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2247 pm_qos_remove_request(&substream->latency_pm_qos_req);
2248 if (substream->pcm_release) {
2249 substream->pcm_release(substream);
2250 substream->pcm_release = NULL;
2251 }
2252 snd_pcm_detach_substream(substream);
2253 }
2254
2255 EXPORT_SYMBOL(snd_pcm_release_substream);
2256
snd_pcm_open_substream(struct snd_pcm * pcm,int stream,struct file * file,struct snd_pcm_substream ** rsubstream)2257 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2258 struct file *file,
2259 struct snd_pcm_substream **rsubstream)
2260 {
2261 struct snd_pcm_substream *substream;
2262 int err;
2263
2264 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2265 if (err < 0)
2266 return err;
2267 if (substream->ref_count > 1) {
2268 *rsubstream = substream;
2269 return 0;
2270 }
2271
2272 err = snd_pcm_hw_constraints_init(substream);
2273 if (err < 0) {
2274 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2275 goto error;
2276 }
2277
2278 if ((err = substream->ops->open(substream)) < 0)
2279 goto error;
2280
2281 substream->hw_opened = 1;
2282
2283 err = snd_pcm_hw_constraints_complete(substream);
2284 if (err < 0) {
2285 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2286 goto error;
2287 }
2288
2289 *rsubstream = substream;
2290 return 0;
2291
2292 error:
2293 snd_pcm_release_substream(substream);
2294 return err;
2295 }
2296
2297 EXPORT_SYMBOL(snd_pcm_open_substream);
2298
snd_pcm_open_file(struct file * file,struct snd_pcm * pcm,int stream)2299 static int snd_pcm_open_file(struct file *file,
2300 struct snd_pcm *pcm,
2301 int stream)
2302 {
2303 struct snd_pcm_file *pcm_file;
2304 struct snd_pcm_substream *substream;
2305 int err;
2306
2307 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2308 if (err < 0)
2309 return err;
2310
2311 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2312 if (pcm_file == NULL) {
2313 snd_pcm_release_substream(substream);
2314 return -ENOMEM;
2315 }
2316 pcm_file->substream = substream;
2317 if (substream->ref_count == 1) {
2318 substream->file = pcm_file;
2319 substream->pcm_release = pcm_release_private;
2320 }
2321 file->private_data = pcm_file;
2322
2323 return 0;
2324 }
2325
snd_pcm_playback_open(struct inode * inode,struct file * file)2326 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2327 {
2328 struct snd_pcm *pcm;
2329 int err = nonseekable_open(inode, file);
2330 if (err < 0)
2331 return err;
2332 pcm = snd_lookup_minor_data(iminor(inode),
2333 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2334 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2335 if (pcm)
2336 snd_card_unref(pcm->card);
2337 return err;
2338 }
2339
snd_pcm_capture_open(struct inode * inode,struct file * file)2340 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2341 {
2342 struct snd_pcm *pcm;
2343 int err = nonseekable_open(inode, file);
2344 if (err < 0)
2345 return err;
2346 pcm = snd_lookup_minor_data(iminor(inode),
2347 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2348 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2349 if (pcm)
2350 snd_card_unref(pcm->card);
2351 return err;
2352 }
2353
snd_pcm_open(struct file * file,struct snd_pcm * pcm,int stream)2354 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2355 {
2356 int err;
2357 wait_queue_t wait;
2358
2359 if (pcm == NULL) {
2360 err = -ENODEV;
2361 goto __error1;
2362 }
2363 err = snd_card_file_add(pcm->card, file);
2364 if (err < 0)
2365 goto __error1;
2366 if (!try_module_get(pcm->card->module)) {
2367 err = -EFAULT;
2368 goto __error2;
2369 }
2370 init_waitqueue_entry(&wait, current);
2371 add_wait_queue(&pcm->open_wait, &wait);
2372 mutex_lock(&pcm->open_mutex);
2373 while (1) {
2374 err = snd_pcm_open_file(file, pcm, stream);
2375 if (err >= 0)
2376 break;
2377 if (err == -EAGAIN) {
2378 if (file->f_flags & O_NONBLOCK) {
2379 err = -EBUSY;
2380 break;
2381 }
2382 } else
2383 break;
2384 set_current_state(TASK_INTERRUPTIBLE);
2385 mutex_unlock(&pcm->open_mutex);
2386 schedule();
2387 mutex_lock(&pcm->open_mutex);
2388 if (pcm->card->shutdown) {
2389 err = -ENODEV;
2390 break;
2391 }
2392 if (signal_pending(current)) {
2393 err = -ERESTARTSYS;
2394 break;
2395 }
2396 }
2397 remove_wait_queue(&pcm->open_wait, &wait);
2398 mutex_unlock(&pcm->open_mutex);
2399 if (err < 0)
2400 goto __error;
2401 return err;
2402
2403 __error:
2404 module_put(pcm->card->module);
2405 __error2:
2406 snd_card_file_remove(pcm->card, file);
2407 __error1:
2408 return err;
2409 }
2410
snd_pcm_release(struct inode * inode,struct file * file)2411 static int snd_pcm_release(struct inode *inode, struct file *file)
2412 {
2413 struct snd_pcm *pcm;
2414 struct snd_pcm_substream *substream;
2415 struct snd_pcm_file *pcm_file;
2416
2417 pcm_file = file->private_data;
2418 substream = pcm_file->substream;
2419 if (snd_BUG_ON(!substream))
2420 return -ENXIO;
2421 pcm = substream->pcm;
2422 mutex_lock(&pcm->open_mutex);
2423 snd_pcm_release_substream(substream);
2424 kfree(pcm_file);
2425 mutex_unlock(&pcm->open_mutex);
2426 wake_up(&pcm->open_wait);
2427 module_put(pcm->card->module);
2428 snd_card_file_remove(pcm->card, file);
2429 return 0;
2430 }
2431
snd_pcm_playback_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2432 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2433 snd_pcm_uframes_t frames)
2434 {
2435 struct snd_pcm_runtime *runtime = substream->runtime;
2436 snd_pcm_sframes_t appl_ptr;
2437 snd_pcm_sframes_t ret;
2438 snd_pcm_sframes_t hw_avail;
2439
2440 if (frames == 0)
2441 return 0;
2442
2443 snd_pcm_stream_lock_irq(substream);
2444 switch (runtime->status->state) {
2445 case SNDRV_PCM_STATE_PREPARED:
2446 break;
2447 case SNDRV_PCM_STATE_DRAINING:
2448 case SNDRV_PCM_STATE_RUNNING:
2449 if (snd_pcm_update_hw_ptr(substream) >= 0)
2450 break;
2451 /* Fall through */
2452 case SNDRV_PCM_STATE_XRUN:
2453 ret = -EPIPE;
2454 goto __end;
2455 case SNDRV_PCM_STATE_SUSPENDED:
2456 ret = -ESTRPIPE;
2457 goto __end;
2458 default:
2459 ret = -EBADFD;
2460 goto __end;
2461 }
2462
2463 hw_avail = snd_pcm_playback_hw_avail(runtime);
2464 if (hw_avail <= 0) {
2465 ret = 0;
2466 goto __end;
2467 }
2468 if (frames > (snd_pcm_uframes_t)hw_avail)
2469 frames = hw_avail;
2470 appl_ptr = runtime->control->appl_ptr - frames;
2471 if (appl_ptr < 0)
2472 appl_ptr += runtime->boundary;
2473 runtime->control->appl_ptr = appl_ptr;
2474 ret = frames;
2475 __end:
2476 snd_pcm_stream_unlock_irq(substream);
2477 return ret;
2478 }
2479
snd_pcm_capture_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2480 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2481 snd_pcm_uframes_t frames)
2482 {
2483 struct snd_pcm_runtime *runtime = substream->runtime;
2484 snd_pcm_sframes_t appl_ptr;
2485 snd_pcm_sframes_t ret;
2486 snd_pcm_sframes_t hw_avail;
2487
2488 if (frames == 0)
2489 return 0;
2490
2491 snd_pcm_stream_lock_irq(substream);
2492 switch (runtime->status->state) {
2493 case SNDRV_PCM_STATE_PREPARED:
2494 case SNDRV_PCM_STATE_DRAINING:
2495 break;
2496 case SNDRV_PCM_STATE_RUNNING:
2497 if (snd_pcm_update_hw_ptr(substream) >= 0)
2498 break;
2499 /* Fall through */
2500 case SNDRV_PCM_STATE_XRUN:
2501 ret = -EPIPE;
2502 goto __end;
2503 case SNDRV_PCM_STATE_SUSPENDED:
2504 ret = -ESTRPIPE;
2505 goto __end;
2506 default:
2507 ret = -EBADFD;
2508 goto __end;
2509 }
2510
2511 hw_avail = snd_pcm_capture_hw_avail(runtime);
2512 if (hw_avail <= 0) {
2513 ret = 0;
2514 goto __end;
2515 }
2516 if (frames > (snd_pcm_uframes_t)hw_avail)
2517 frames = hw_avail;
2518 appl_ptr = runtime->control->appl_ptr - frames;
2519 if (appl_ptr < 0)
2520 appl_ptr += runtime->boundary;
2521 runtime->control->appl_ptr = appl_ptr;
2522 ret = frames;
2523 __end:
2524 snd_pcm_stream_unlock_irq(substream);
2525 return ret;
2526 }
2527
snd_pcm_playback_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2528 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2529 snd_pcm_uframes_t frames)
2530 {
2531 struct snd_pcm_runtime *runtime = substream->runtime;
2532 snd_pcm_sframes_t appl_ptr;
2533 snd_pcm_sframes_t ret;
2534 snd_pcm_sframes_t avail;
2535
2536 if (frames == 0)
2537 return 0;
2538
2539 snd_pcm_stream_lock_irq(substream);
2540 switch (runtime->status->state) {
2541 case SNDRV_PCM_STATE_PREPARED:
2542 case SNDRV_PCM_STATE_PAUSED:
2543 break;
2544 case SNDRV_PCM_STATE_DRAINING:
2545 case SNDRV_PCM_STATE_RUNNING:
2546 if (snd_pcm_update_hw_ptr(substream) >= 0)
2547 break;
2548 /* Fall through */
2549 case SNDRV_PCM_STATE_XRUN:
2550 ret = -EPIPE;
2551 goto __end;
2552 case SNDRV_PCM_STATE_SUSPENDED:
2553 ret = -ESTRPIPE;
2554 goto __end;
2555 default:
2556 ret = -EBADFD;
2557 goto __end;
2558 }
2559
2560 avail = snd_pcm_playback_avail(runtime);
2561 if (avail <= 0) {
2562 ret = 0;
2563 goto __end;
2564 }
2565 if (frames > (snd_pcm_uframes_t)avail)
2566 frames = avail;
2567 appl_ptr = runtime->control->appl_ptr + frames;
2568 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2569 appl_ptr -= runtime->boundary;
2570 runtime->control->appl_ptr = appl_ptr;
2571 ret = frames;
2572 __end:
2573 snd_pcm_stream_unlock_irq(substream);
2574 return ret;
2575 }
2576
snd_pcm_capture_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2577 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2578 snd_pcm_uframes_t frames)
2579 {
2580 struct snd_pcm_runtime *runtime = substream->runtime;
2581 snd_pcm_sframes_t appl_ptr;
2582 snd_pcm_sframes_t ret;
2583 snd_pcm_sframes_t avail;
2584
2585 if (frames == 0)
2586 return 0;
2587
2588 snd_pcm_stream_lock_irq(substream);
2589 switch (runtime->status->state) {
2590 case SNDRV_PCM_STATE_PREPARED:
2591 case SNDRV_PCM_STATE_DRAINING:
2592 case SNDRV_PCM_STATE_PAUSED:
2593 break;
2594 case SNDRV_PCM_STATE_RUNNING:
2595 if (snd_pcm_update_hw_ptr(substream) >= 0)
2596 break;
2597 /* Fall through */
2598 case SNDRV_PCM_STATE_XRUN:
2599 ret = -EPIPE;
2600 goto __end;
2601 case SNDRV_PCM_STATE_SUSPENDED:
2602 ret = -ESTRPIPE;
2603 goto __end;
2604 default:
2605 ret = -EBADFD;
2606 goto __end;
2607 }
2608
2609 avail = snd_pcm_capture_avail(runtime);
2610 if (avail <= 0) {
2611 ret = 0;
2612 goto __end;
2613 }
2614 if (frames > (snd_pcm_uframes_t)avail)
2615 frames = avail;
2616 appl_ptr = runtime->control->appl_ptr + frames;
2617 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2618 appl_ptr -= runtime->boundary;
2619 runtime->control->appl_ptr = appl_ptr;
2620 ret = frames;
2621 __end:
2622 snd_pcm_stream_unlock_irq(substream);
2623 return ret;
2624 }
2625
snd_pcm_hwsync(struct snd_pcm_substream * substream)2626 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2627 {
2628 struct snd_pcm_runtime *runtime = substream->runtime;
2629 int err;
2630
2631 snd_pcm_stream_lock_irq(substream);
2632 switch (runtime->status->state) {
2633 case SNDRV_PCM_STATE_DRAINING:
2634 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2635 goto __badfd;
2636 /* Fall through */
2637 case SNDRV_PCM_STATE_RUNNING:
2638 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2639 break;
2640 /* Fall through */
2641 case SNDRV_PCM_STATE_PREPARED:
2642 case SNDRV_PCM_STATE_SUSPENDED:
2643 err = 0;
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 -ENXIO;
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 -ENXIO;
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 area->vm_end - area->vm_start);
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