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 #include <linux/delay.h>
39
40 /*
41 * Compatibility
42 */
43
44 struct snd_pcm_hw_params_old {
45 unsigned int flags;
46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
47 SNDRV_PCM_HW_PARAM_ACCESS + 1];
48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
50 unsigned int rmask;
51 unsigned int cmask;
52 unsigned int info;
53 unsigned int msbits;
54 unsigned int rate_num;
55 unsigned int rate_den;
56 snd_pcm_uframes_t fifo_size;
57 unsigned char reserved[64];
58 };
59
60 #ifdef CONFIG_SND_SUPPORT_OLD_API
61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
63
64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 #endif
69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
70
71 /*
72 *
73 */
74
75 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
77
78 /* Writer in rwsem may block readers even during its waiting in queue,
79 * and this may lead to a deadlock when the code path takes read sem
80 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
81 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to
82 * sleep until all the readers are completed without blocking by writer.
83 */
down_write_nonfifo(struct rw_semaphore * lock)84 static inline void down_write_nonfifo(struct rw_semaphore *lock)
85 {
86 while (!down_write_trylock(lock))
87 msleep(1);
88 }
89
90 /**
91 * snd_pcm_stream_lock - Lock the PCM stream
92 * @substream: PCM substream
93 *
94 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
95 * flag of the given substream. This also takes the global link rw lock
96 * (or rw sem), too, for avoiding the race with linked streams.
97 */
snd_pcm_stream_lock(struct snd_pcm_substream * substream)98 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
99 {
100 if (substream->pcm->nonatomic) {
101 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
102 mutex_lock(&substream->self_group.mutex);
103 } else {
104 read_lock(&snd_pcm_link_rwlock);
105 spin_lock(&substream->self_group.lock);
106 }
107 }
108 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
109
110 /**
111 * snd_pcm_stream_lock - Unlock the PCM stream
112 * @substream: PCM substream
113 *
114 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
115 */
snd_pcm_stream_unlock(struct snd_pcm_substream * substream)116 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
117 {
118 if (substream->pcm->nonatomic) {
119 mutex_unlock(&substream->self_group.mutex);
120 up_read(&snd_pcm_link_rwsem);
121 } else {
122 spin_unlock(&substream->self_group.lock);
123 read_unlock(&snd_pcm_link_rwlock);
124 }
125 }
126 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
127
128 /**
129 * snd_pcm_stream_lock_irq - Lock the PCM stream
130 * @substream: PCM substream
131 *
132 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
133 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
134 * as snd_pcm_stream_lock().
135 */
snd_pcm_stream_lock_irq(struct snd_pcm_substream * substream)136 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
137 {
138 if (!substream->pcm->nonatomic)
139 local_irq_disable();
140 snd_pcm_stream_lock(substream);
141 }
142 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
143
144 /**
145 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
146 * @substream: PCM substream
147 *
148 * This is a counter-part of snd_pcm_stream_lock_irq().
149 */
snd_pcm_stream_unlock_irq(struct snd_pcm_substream * substream)150 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
151 {
152 snd_pcm_stream_unlock(substream);
153 if (!substream->pcm->nonatomic)
154 local_irq_enable();
155 }
156 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
157
_snd_pcm_stream_lock_irqsave(struct snd_pcm_substream * substream)158 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
159 {
160 unsigned long flags = 0;
161 if (!substream->pcm->nonatomic)
162 local_irq_save(flags);
163 snd_pcm_stream_lock(substream);
164 return flags;
165 }
166 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
167
168 /**
169 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
170 * @substream: PCM substream
171 * @flags: irq flags
172 *
173 * This is a counter-part of snd_pcm_stream_lock_irqsave().
174 */
snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream * substream,unsigned long flags)175 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
176 unsigned long flags)
177 {
178 snd_pcm_stream_unlock(substream);
179 if (!substream->pcm->nonatomic)
180 local_irq_restore(flags);
181 }
182 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
183
snd_enter_user(void)184 static inline mm_segment_t snd_enter_user(void)
185 {
186 mm_segment_t fs = get_fs();
187 set_fs(get_ds());
188 return fs;
189 }
190
snd_leave_user(mm_segment_t fs)191 static inline void snd_leave_user(mm_segment_t fs)
192 {
193 set_fs(fs);
194 }
195
196
197
snd_pcm_info(struct snd_pcm_substream * substream,struct snd_pcm_info * info)198 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
199 {
200 struct snd_pcm_runtime *runtime;
201 struct snd_pcm *pcm = substream->pcm;
202 struct snd_pcm_str *pstr = substream->pstr;
203
204 memset(info, 0, sizeof(*info));
205 info->card = pcm->card->number;
206 info->device = pcm->device;
207 info->stream = substream->stream;
208 info->subdevice = substream->number;
209 strlcpy(info->id, pcm->id, sizeof(info->id));
210 strlcpy(info->name, pcm->name, sizeof(info->name));
211 info->dev_class = pcm->dev_class;
212 info->dev_subclass = pcm->dev_subclass;
213 info->subdevices_count = pstr->substream_count;
214 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
215 strlcpy(info->subname, substream->name, sizeof(info->subname));
216 runtime = substream->runtime;
217
218 return 0;
219 }
220
snd_pcm_info_user(struct snd_pcm_substream * substream,struct snd_pcm_info __user * _info)221 int snd_pcm_info_user(struct snd_pcm_substream *substream,
222 struct snd_pcm_info __user * _info)
223 {
224 struct snd_pcm_info *info;
225 int err;
226
227 info = kmalloc(sizeof(*info), GFP_KERNEL);
228 if (! info)
229 return -ENOMEM;
230 err = snd_pcm_info(substream, info);
231 if (err >= 0) {
232 if (copy_to_user(_info, info, sizeof(*info)))
233 err = -EFAULT;
234 }
235 kfree(info);
236 return err;
237 }
238
hw_support_mmap(struct snd_pcm_substream * substream)239 static bool hw_support_mmap(struct snd_pcm_substream *substream)
240 {
241 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
242 return false;
243 /* check architectures that return -EINVAL from dma_mmap_coherent() */
244 /* FIXME: this should be some global flag */
245 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
246 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
247 if (!substream->ops->mmap &&
248 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
249 return false;
250 #endif
251 return true;
252 }
253
254 #undef RULES_DEBUG
255
256 #ifdef RULES_DEBUG
257 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
258 static const char * const snd_pcm_hw_param_names[] = {
259 HW_PARAM(ACCESS),
260 HW_PARAM(FORMAT),
261 HW_PARAM(SUBFORMAT),
262 HW_PARAM(SAMPLE_BITS),
263 HW_PARAM(FRAME_BITS),
264 HW_PARAM(CHANNELS),
265 HW_PARAM(RATE),
266 HW_PARAM(PERIOD_TIME),
267 HW_PARAM(PERIOD_SIZE),
268 HW_PARAM(PERIOD_BYTES),
269 HW_PARAM(PERIODS),
270 HW_PARAM(BUFFER_TIME),
271 HW_PARAM(BUFFER_SIZE),
272 HW_PARAM(BUFFER_BYTES),
273 HW_PARAM(TICK_TIME),
274 };
275 #endif
276
snd_pcm_hw_refine(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)277 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
278 struct snd_pcm_hw_params *params)
279 {
280 unsigned int k;
281 struct snd_pcm_hardware *hw;
282 struct snd_interval *i = NULL;
283 struct snd_mask *m = NULL;
284 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
285 unsigned int rstamps[constrs->rules_num];
286 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
287 unsigned int stamp = 2;
288 int changed, again;
289
290 params->info = 0;
291 params->fifo_size = 0;
292 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
293 params->msbits = 0;
294 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
295 params->rate_num = 0;
296 params->rate_den = 0;
297 }
298
299 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
300 m = hw_param_mask(params, k);
301 if (snd_mask_empty(m))
302 return -EINVAL;
303 if (!(params->rmask & (1 << k)))
304 continue;
305 #ifdef RULES_DEBUG
306 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
307 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
308 #endif
309 changed = snd_mask_refine(m, constrs_mask(constrs, k));
310 #ifdef RULES_DEBUG
311 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
312 #endif
313 if (changed)
314 params->cmask |= 1 << k;
315 if (changed < 0)
316 return changed;
317 }
318
319 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
320 i = hw_param_interval(params, k);
321 if (snd_interval_empty(i))
322 return -EINVAL;
323 if (!(params->rmask & (1 << k)))
324 continue;
325 #ifdef RULES_DEBUG
326 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
327 if (i->empty)
328 pr_cont("empty");
329 else
330 pr_cont("%c%u %u%c",
331 i->openmin ? '(' : '[', i->min,
332 i->max, i->openmax ? ')' : ']');
333 pr_cont(" -> ");
334 #endif
335 changed = snd_interval_refine(i, constrs_interval(constrs, k));
336 #ifdef RULES_DEBUG
337 if (i->empty)
338 pr_cont("empty\n");
339 else
340 pr_cont("%c%u %u%c\n",
341 i->openmin ? '(' : '[', i->min,
342 i->max, i->openmax ? ')' : ']');
343 #endif
344 if (changed)
345 params->cmask |= 1 << k;
346 if (changed < 0)
347 return changed;
348 }
349
350 for (k = 0; k < constrs->rules_num; k++)
351 rstamps[k] = 0;
352 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
353 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
354 do {
355 again = 0;
356 for (k = 0; k < constrs->rules_num; k++) {
357 struct snd_pcm_hw_rule *r = &constrs->rules[k];
358 unsigned int d;
359 int doit = 0;
360 if (r->cond && !(r->cond & params->flags))
361 continue;
362 for (d = 0; r->deps[d] >= 0; d++) {
363 if (vstamps[r->deps[d]] > rstamps[k]) {
364 doit = 1;
365 break;
366 }
367 }
368 if (!doit)
369 continue;
370 #ifdef RULES_DEBUG
371 pr_debug("Rule %d [%p]: ", k, r->func);
372 if (r->var >= 0) {
373 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
374 if (hw_is_mask(r->var)) {
375 m = hw_param_mask(params, r->var);
376 pr_cont("%x", *m->bits);
377 } else {
378 i = hw_param_interval(params, r->var);
379 if (i->empty)
380 pr_cont("empty");
381 else
382 pr_cont("%c%u %u%c",
383 i->openmin ? '(' : '[', i->min,
384 i->max, i->openmax ? ')' : ']');
385 }
386 }
387 #endif
388 changed = r->func(params, r);
389 #ifdef RULES_DEBUG
390 if (r->var >= 0) {
391 pr_cont(" -> ");
392 if (hw_is_mask(r->var))
393 pr_cont("%x", *m->bits);
394 else {
395 if (i->empty)
396 pr_cont("empty");
397 else
398 pr_cont("%c%u %u%c",
399 i->openmin ? '(' : '[', i->min,
400 i->max, i->openmax ? ')' : ']');
401 }
402 }
403 pr_cont("\n");
404 #endif
405 rstamps[k] = stamp;
406 if (changed && r->var >= 0) {
407 params->cmask |= (1 << r->var);
408 vstamps[r->var] = stamp;
409 again = 1;
410 }
411 if (changed < 0)
412 return changed;
413 stamp++;
414 }
415 } while (again);
416 if (!params->msbits) {
417 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
418 if (snd_interval_single(i))
419 params->msbits = snd_interval_value(i);
420 }
421
422 if (!params->rate_den) {
423 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
424 if (snd_interval_single(i)) {
425 params->rate_num = snd_interval_value(i);
426 params->rate_den = 1;
427 }
428 }
429
430 hw = &substream->runtime->hw;
431 if (!params->info) {
432 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
433 SNDRV_PCM_INFO_DRAIN_TRIGGER);
434 if (!hw_support_mmap(substream))
435 params->info &= ~(SNDRV_PCM_INFO_MMAP |
436 SNDRV_PCM_INFO_MMAP_VALID);
437 }
438 if (!params->fifo_size) {
439 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
440 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
441 if (snd_mask_min(m) == snd_mask_max(m) &&
442 snd_interval_min(i) == snd_interval_max(i)) {
443 changed = substream->ops->ioctl(substream,
444 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
445 if (changed < 0)
446 return changed;
447 }
448 }
449 params->rmask = 0;
450 return 0;
451 }
452
453 EXPORT_SYMBOL(snd_pcm_hw_refine);
454
snd_pcm_hw_refine_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)455 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
456 struct snd_pcm_hw_params __user * _params)
457 {
458 struct snd_pcm_hw_params *params;
459 int err;
460
461 params = memdup_user(_params, sizeof(*params));
462 if (IS_ERR(params))
463 return PTR_ERR(params);
464
465 err = snd_pcm_hw_refine(substream, params);
466 if (copy_to_user(_params, params, sizeof(*params))) {
467 if (!err)
468 err = -EFAULT;
469 }
470
471 kfree(params);
472 return err;
473 }
474
period_to_usecs(struct snd_pcm_runtime * runtime)475 static int period_to_usecs(struct snd_pcm_runtime *runtime)
476 {
477 int usecs;
478
479 if (! runtime->rate)
480 return -1; /* invalid */
481
482 /* take 75% of period time as the deadline */
483 usecs = (750000 / runtime->rate) * runtime->period_size;
484 usecs += ((750000 % runtime->rate) * runtime->period_size) /
485 runtime->rate;
486
487 return usecs;
488 }
489
snd_pcm_set_state(struct snd_pcm_substream * substream,int state)490 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
491 {
492 snd_pcm_stream_lock_irq(substream);
493 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
494 substream->runtime->status->state = state;
495 snd_pcm_stream_unlock_irq(substream);
496 }
497
snd_pcm_timer_notify(struct snd_pcm_substream * substream,int event)498 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
499 int event)
500 {
501 #ifdef CONFIG_SND_PCM_TIMER
502 if (substream->timer)
503 snd_timer_notify(substream->timer, event,
504 &substream->runtime->trigger_tstamp);
505 #endif
506 }
507
snd_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)508 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
509 struct snd_pcm_hw_params *params)
510 {
511 struct snd_pcm_runtime *runtime;
512 int err, usecs;
513 unsigned int bits;
514 snd_pcm_uframes_t frames;
515
516 if (PCM_RUNTIME_CHECK(substream))
517 return -ENXIO;
518 runtime = substream->runtime;
519 snd_pcm_stream_lock_irq(substream);
520 switch (runtime->status->state) {
521 case SNDRV_PCM_STATE_OPEN:
522 case SNDRV_PCM_STATE_SETUP:
523 case SNDRV_PCM_STATE_PREPARED:
524 break;
525 default:
526 snd_pcm_stream_unlock_irq(substream);
527 return -EBADFD;
528 }
529 snd_pcm_stream_unlock_irq(substream);
530 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
531 if (!substream->oss.oss)
532 #endif
533 if (atomic_read(&substream->mmap_count))
534 return -EBADFD;
535
536 params->rmask = ~0U;
537 err = snd_pcm_hw_refine(substream, params);
538 if (err < 0)
539 goto _error;
540
541 err = snd_pcm_hw_params_choose(substream, params);
542 if (err < 0)
543 goto _error;
544
545 if (substream->ops->hw_params != NULL) {
546 err = substream->ops->hw_params(substream, params);
547 if (err < 0)
548 goto _error;
549 }
550
551 runtime->access = params_access(params);
552 runtime->format = params_format(params);
553 runtime->subformat = params_subformat(params);
554 runtime->channels = params_channels(params);
555 runtime->rate = params_rate(params);
556 runtime->period_size = params_period_size(params);
557 runtime->periods = params_periods(params);
558 runtime->buffer_size = params_buffer_size(params);
559 runtime->info = params->info;
560 runtime->rate_num = params->rate_num;
561 runtime->rate_den = params->rate_den;
562 runtime->no_period_wakeup =
563 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
564 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
565
566 bits = snd_pcm_format_physical_width(runtime->format);
567 runtime->sample_bits = bits;
568 bits *= runtime->channels;
569 runtime->frame_bits = bits;
570 frames = 1;
571 while (bits % 8 != 0) {
572 bits *= 2;
573 frames *= 2;
574 }
575 runtime->byte_align = bits / 8;
576 runtime->min_align = frames;
577
578 /* Default sw params */
579 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
580 runtime->period_step = 1;
581 runtime->control->avail_min = runtime->period_size;
582 runtime->start_threshold = 1;
583 runtime->stop_threshold = runtime->buffer_size;
584 runtime->silence_threshold = 0;
585 runtime->silence_size = 0;
586 runtime->boundary = runtime->buffer_size;
587 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
588 runtime->boundary *= 2;
589
590 /* clear the buffer for avoiding possible kernel info leaks */
591 if (runtime->dma_area && !substream->ops->copy)
592 memset(runtime->dma_area, 0, runtime->dma_bytes);
593
594 snd_pcm_timer_resolution_change(substream);
595 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
596
597 if (pm_qos_request_active(&substream->latency_pm_qos_req))
598 pm_qos_remove_request(&substream->latency_pm_qos_req);
599 if ((usecs = period_to_usecs(runtime)) >= 0)
600 pm_qos_add_request(&substream->latency_pm_qos_req,
601 PM_QOS_CPU_DMA_LATENCY, usecs);
602 return 0;
603 _error:
604 /* hardware might be unusable from this time,
605 so we force application to retry to set
606 the correct hardware parameter settings */
607 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
608 if (substream->ops->hw_free != NULL)
609 substream->ops->hw_free(substream);
610 return err;
611 }
612
snd_pcm_hw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)613 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
614 struct snd_pcm_hw_params __user * _params)
615 {
616 struct snd_pcm_hw_params *params;
617 int err;
618
619 params = memdup_user(_params, sizeof(*params));
620 if (IS_ERR(params))
621 return PTR_ERR(params);
622
623 err = snd_pcm_hw_params(substream, params);
624 if (copy_to_user(_params, params, sizeof(*params))) {
625 if (!err)
626 err = -EFAULT;
627 }
628
629 kfree(params);
630 return err;
631 }
632
snd_pcm_hw_free(struct snd_pcm_substream * substream)633 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
634 {
635 struct snd_pcm_runtime *runtime;
636 int result = 0;
637
638 if (PCM_RUNTIME_CHECK(substream))
639 return -ENXIO;
640 runtime = substream->runtime;
641 snd_pcm_stream_lock_irq(substream);
642 switch (runtime->status->state) {
643 case SNDRV_PCM_STATE_SETUP:
644 case SNDRV_PCM_STATE_PREPARED:
645 break;
646 default:
647 snd_pcm_stream_unlock_irq(substream);
648 return -EBADFD;
649 }
650 snd_pcm_stream_unlock_irq(substream);
651 if (atomic_read(&substream->mmap_count))
652 return -EBADFD;
653 if (substream->ops->hw_free)
654 result = substream->ops->hw_free(substream);
655 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
656 pm_qos_remove_request(&substream->latency_pm_qos_req);
657 return result;
658 }
659
snd_pcm_sw_params(struct snd_pcm_substream * substream,struct snd_pcm_sw_params * params)660 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
661 struct snd_pcm_sw_params *params)
662 {
663 struct snd_pcm_runtime *runtime;
664 int err;
665
666 if (PCM_RUNTIME_CHECK(substream))
667 return -ENXIO;
668 runtime = substream->runtime;
669 snd_pcm_stream_lock_irq(substream);
670 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
671 snd_pcm_stream_unlock_irq(substream);
672 return -EBADFD;
673 }
674 snd_pcm_stream_unlock_irq(substream);
675
676 if (params->tstamp_mode < 0 ||
677 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
678 return -EINVAL;
679 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
680 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
681 return -EINVAL;
682 if (params->avail_min == 0)
683 return -EINVAL;
684 if (params->silence_size >= runtime->boundary) {
685 if (params->silence_threshold != 0)
686 return -EINVAL;
687 } else {
688 if (params->silence_size > params->silence_threshold)
689 return -EINVAL;
690 if (params->silence_threshold > runtime->buffer_size)
691 return -EINVAL;
692 }
693 err = 0;
694 snd_pcm_stream_lock_irq(substream);
695 runtime->tstamp_mode = params->tstamp_mode;
696 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
697 runtime->tstamp_type = params->tstamp_type;
698 runtime->period_step = params->period_step;
699 runtime->control->avail_min = params->avail_min;
700 runtime->start_threshold = params->start_threshold;
701 runtime->stop_threshold = params->stop_threshold;
702 runtime->silence_threshold = params->silence_threshold;
703 runtime->silence_size = params->silence_size;
704 params->boundary = runtime->boundary;
705 if (snd_pcm_running(substream)) {
706 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
707 runtime->silence_size > 0)
708 snd_pcm_playback_silence(substream, ULONG_MAX);
709 err = snd_pcm_update_state(substream, runtime);
710 }
711 snd_pcm_stream_unlock_irq(substream);
712 return err;
713 }
714
snd_pcm_sw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_sw_params __user * _params)715 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
716 struct snd_pcm_sw_params __user * _params)
717 {
718 struct snd_pcm_sw_params params;
719 int err;
720 if (copy_from_user(¶ms, _params, sizeof(params)))
721 return -EFAULT;
722 err = snd_pcm_sw_params(substream, ¶ms);
723 if (copy_to_user(_params, ¶ms, sizeof(params)))
724 return -EFAULT;
725 return err;
726 }
727
snd_pcm_status(struct snd_pcm_substream * substream,struct snd_pcm_status * status)728 int snd_pcm_status(struct snd_pcm_substream *substream,
729 struct snd_pcm_status *status)
730 {
731 struct snd_pcm_runtime *runtime = substream->runtime;
732
733 snd_pcm_stream_lock_irq(substream);
734
735 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
736 &runtime->audio_tstamp_config);
737
738 /* backwards compatible behavior */
739 if (runtime->audio_tstamp_config.type_requested ==
740 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
741 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
742 runtime->audio_tstamp_config.type_requested =
743 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
744 else
745 runtime->audio_tstamp_config.type_requested =
746 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
747 runtime->audio_tstamp_report.valid = 0;
748 } else
749 runtime->audio_tstamp_report.valid = 1;
750
751 status->state = runtime->status->state;
752 status->suspended_state = runtime->status->suspended_state;
753 if (status->state == SNDRV_PCM_STATE_OPEN)
754 goto _end;
755 status->trigger_tstamp = runtime->trigger_tstamp;
756 if (snd_pcm_running(substream)) {
757 snd_pcm_update_hw_ptr(substream);
758 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
759 status->tstamp = runtime->status->tstamp;
760 status->driver_tstamp = runtime->driver_tstamp;
761 status->audio_tstamp =
762 runtime->status->audio_tstamp;
763 if (runtime->audio_tstamp_report.valid == 1)
764 /* backwards compatibility, no report provided in COMPAT mode */
765 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
766 &status->audio_tstamp_accuracy,
767 &runtime->audio_tstamp_report);
768
769 goto _tstamp_end;
770 }
771 } else {
772 /* get tstamp only in fallback mode and only if enabled */
773 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
774 snd_pcm_gettime(runtime, &status->tstamp);
775 }
776 _tstamp_end:
777 status->appl_ptr = runtime->control->appl_ptr;
778 status->hw_ptr = runtime->status->hw_ptr;
779 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
780 status->avail = snd_pcm_playback_avail(runtime);
781 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
782 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
783 status->delay = runtime->buffer_size - status->avail;
784 status->delay += runtime->delay;
785 } else
786 status->delay = 0;
787 } else {
788 status->avail = snd_pcm_capture_avail(runtime);
789 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
790 status->delay = status->avail + runtime->delay;
791 else
792 status->delay = 0;
793 }
794 status->avail_max = runtime->avail_max;
795 status->overrange = runtime->overrange;
796 runtime->avail_max = 0;
797 runtime->overrange = 0;
798 _end:
799 snd_pcm_stream_unlock_irq(substream);
800 return 0;
801 }
802
snd_pcm_status_user(struct snd_pcm_substream * substream,struct snd_pcm_status __user * _status,bool ext)803 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
804 struct snd_pcm_status __user * _status,
805 bool ext)
806 {
807 struct snd_pcm_status status;
808 int res;
809
810 memset(&status, 0, sizeof(status));
811 /*
812 * with extension, parameters are read/write,
813 * get audio_tstamp_data from user,
814 * ignore rest of status structure
815 */
816 if (ext && get_user(status.audio_tstamp_data,
817 (u32 __user *)(&_status->audio_tstamp_data)))
818 return -EFAULT;
819 res = snd_pcm_status(substream, &status);
820 if (res < 0)
821 return res;
822 if (copy_to_user(_status, &status, sizeof(status)))
823 return -EFAULT;
824 return 0;
825 }
826
snd_pcm_channel_info(struct snd_pcm_substream * substream,struct snd_pcm_channel_info * info)827 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
828 struct snd_pcm_channel_info * info)
829 {
830 struct snd_pcm_runtime *runtime;
831 unsigned int channel;
832
833 channel = info->channel;
834 runtime = substream->runtime;
835 snd_pcm_stream_lock_irq(substream);
836 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
837 snd_pcm_stream_unlock_irq(substream);
838 return -EBADFD;
839 }
840 snd_pcm_stream_unlock_irq(substream);
841 if (channel >= runtime->channels)
842 return -EINVAL;
843 memset(info, 0, sizeof(*info));
844 info->channel = channel;
845 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
846 }
847
snd_pcm_channel_info_user(struct snd_pcm_substream * substream,struct snd_pcm_channel_info __user * _info)848 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
849 struct snd_pcm_channel_info __user * _info)
850 {
851 struct snd_pcm_channel_info info;
852 int res;
853
854 if (copy_from_user(&info, _info, sizeof(info)))
855 return -EFAULT;
856 res = snd_pcm_channel_info(substream, &info);
857 if (res < 0)
858 return res;
859 if (copy_to_user(_info, &info, sizeof(info)))
860 return -EFAULT;
861 return 0;
862 }
863
snd_pcm_trigger_tstamp(struct snd_pcm_substream * substream)864 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
865 {
866 struct snd_pcm_runtime *runtime = substream->runtime;
867 if (runtime->trigger_master == NULL)
868 return;
869 if (runtime->trigger_master == substream) {
870 if (!runtime->trigger_tstamp_latched)
871 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
872 } else {
873 snd_pcm_trigger_tstamp(runtime->trigger_master);
874 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
875 }
876 runtime->trigger_master = NULL;
877 }
878
879 struct action_ops {
880 int (*pre_action)(struct snd_pcm_substream *substream, int state);
881 int (*do_action)(struct snd_pcm_substream *substream, int state);
882 void (*undo_action)(struct snd_pcm_substream *substream, int state);
883 void (*post_action)(struct snd_pcm_substream *substream, int state);
884 };
885
886 /*
887 * this functions is core for handling of linked stream
888 * Note: the stream state might be changed also on failure
889 * Note2: call with calling stream lock + link lock
890 */
snd_pcm_action_group(struct action_ops * ops,struct snd_pcm_substream * substream,int state,int do_lock)891 static int snd_pcm_action_group(struct action_ops *ops,
892 struct snd_pcm_substream *substream,
893 int state, int do_lock)
894 {
895 struct snd_pcm_substream *s = NULL;
896 struct snd_pcm_substream *s1;
897 int res = 0, depth = 1;
898
899 snd_pcm_group_for_each_entry(s, substream) {
900 if (do_lock && s != substream) {
901 if (s->pcm->nonatomic)
902 mutex_lock_nested(&s->self_group.mutex, depth);
903 else
904 spin_lock_nested(&s->self_group.lock, depth);
905 depth++;
906 }
907 res = ops->pre_action(s, state);
908 if (res < 0)
909 goto _unlock;
910 }
911 snd_pcm_group_for_each_entry(s, substream) {
912 res = ops->do_action(s, state);
913 if (res < 0) {
914 if (ops->undo_action) {
915 snd_pcm_group_for_each_entry(s1, substream) {
916 if (s1 == s) /* failed stream */
917 break;
918 ops->undo_action(s1, state);
919 }
920 }
921 s = NULL; /* unlock all */
922 goto _unlock;
923 }
924 }
925 snd_pcm_group_for_each_entry(s, substream) {
926 ops->post_action(s, state);
927 }
928 _unlock:
929 if (do_lock) {
930 /* unlock streams */
931 snd_pcm_group_for_each_entry(s1, substream) {
932 if (s1 != substream) {
933 if (s1->pcm->nonatomic)
934 mutex_unlock(&s1->self_group.mutex);
935 else
936 spin_unlock(&s1->self_group.lock);
937 }
938 if (s1 == s) /* end */
939 break;
940 }
941 }
942 return res;
943 }
944
945 /*
946 * Note: call with stream lock
947 */
snd_pcm_action_single(struct action_ops * ops,struct snd_pcm_substream * substream,int state)948 static int snd_pcm_action_single(struct action_ops *ops,
949 struct snd_pcm_substream *substream,
950 int state)
951 {
952 int res;
953
954 res = ops->pre_action(substream, state);
955 if (res < 0)
956 return res;
957 res = ops->do_action(substream, state);
958 if (res == 0)
959 ops->post_action(substream, state);
960 else if (ops->undo_action)
961 ops->undo_action(substream, state);
962 return res;
963 }
964
965 /*
966 * Note: call with stream lock
967 */
snd_pcm_action(struct action_ops * ops,struct snd_pcm_substream * substream,int state)968 static int snd_pcm_action(struct action_ops *ops,
969 struct snd_pcm_substream *substream,
970 int state)
971 {
972 int res;
973
974 if (!snd_pcm_stream_linked(substream))
975 return snd_pcm_action_single(ops, substream, state);
976
977 if (substream->pcm->nonatomic) {
978 if (!mutex_trylock(&substream->group->mutex)) {
979 mutex_unlock(&substream->self_group.mutex);
980 mutex_lock(&substream->group->mutex);
981 mutex_lock(&substream->self_group.mutex);
982 }
983 res = snd_pcm_action_group(ops, substream, state, 1);
984 mutex_unlock(&substream->group->mutex);
985 } else {
986 if (!spin_trylock(&substream->group->lock)) {
987 spin_unlock(&substream->self_group.lock);
988 spin_lock(&substream->group->lock);
989 spin_lock(&substream->self_group.lock);
990 }
991 res = snd_pcm_action_group(ops, substream, state, 1);
992 spin_unlock(&substream->group->lock);
993 }
994 return res;
995 }
996
997 /*
998 * Note: don't use any locks before
999 */
snd_pcm_action_lock_irq(struct action_ops * ops,struct snd_pcm_substream * substream,int state)1000 static int snd_pcm_action_lock_irq(struct action_ops *ops,
1001 struct snd_pcm_substream *substream,
1002 int state)
1003 {
1004 int res;
1005
1006 snd_pcm_stream_lock_irq(substream);
1007 res = snd_pcm_action(ops, substream, state);
1008 snd_pcm_stream_unlock_irq(substream);
1009 return res;
1010 }
1011
1012 /*
1013 */
snd_pcm_action_nonatomic(struct action_ops * ops,struct snd_pcm_substream * substream,int state)1014 static int snd_pcm_action_nonatomic(struct action_ops *ops,
1015 struct snd_pcm_substream *substream,
1016 int state)
1017 {
1018 int res;
1019
1020 down_read(&snd_pcm_link_rwsem);
1021 if (snd_pcm_stream_linked(substream))
1022 res = snd_pcm_action_group(ops, substream, state, 0);
1023 else
1024 res = snd_pcm_action_single(ops, substream, state);
1025 up_read(&snd_pcm_link_rwsem);
1026 return res;
1027 }
1028
1029 /*
1030 * start callbacks
1031 */
snd_pcm_pre_start(struct snd_pcm_substream * substream,int state)1032 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1033 {
1034 struct snd_pcm_runtime *runtime = substream->runtime;
1035 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1036 return -EBADFD;
1037 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1038 !snd_pcm_playback_data(substream))
1039 return -EPIPE;
1040 runtime->trigger_tstamp_latched = false;
1041 runtime->trigger_master = substream;
1042 return 0;
1043 }
1044
snd_pcm_do_start(struct snd_pcm_substream * substream,int state)1045 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1046 {
1047 if (substream->runtime->trigger_master != substream)
1048 return 0;
1049 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1050 }
1051
snd_pcm_undo_start(struct snd_pcm_substream * substream,int state)1052 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1053 {
1054 if (substream->runtime->trigger_master == substream)
1055 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1056 }
1057
snd_pcm_post_start(struct snd_pcm_substream * substream,int state)1058 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1059 {
1060 struct snd_pcm_runtime *runtime = substream->runtime;
1061 snd_pcm_trigger_tstamp(substream);
1062 runtime->hw_ptr_jiffies = jiffies;
1063 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1064 runtime->rate;
1065 runtime->status->state = state;
1066 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1067 runtime->silence_size > 0)
1068 snd_pcm_playback_silence(substream, ULONG_MAX);
1069 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1070 }
1071
1072 static struct action_ops snd_pcm_action_start = {
1073 .pre_action = snd_pcm_pre_start,
1074 .do_action = snd_pcm_do_start,
1075 .undo_action = snd_pcm_undo_start,
1076 .post_action = snd_pcm_post_start
1077 };
1078
1079 /**
1080 * snd_pcm_start - start all linked streams
1081 * @substream: the PCM substream instance
1082 *
1083 * Return: Zero if successful, or a negative error code.
1084 */
snd_pcm_start(struct snd_pcm_substream * substream)1085 int snd_pcm_start(struct snd_pcm_substream *substream)
1086 {
1087 return snd_pcm_action(&snd_pcm_action_start, substream,
1088 SNDRV_PCM_STATE_RUNNING);
1089 }
1090
1091 /*
1092 * stop callbacks
1093 */
snd_pcm_pre_stop(struct snd_pcm_substream * substream,int state)1094 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1095 {
1096 struct snd_pcm_runtime *runtime = substream->runtime;
1097 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1098 return -EBADFD;
1099 runtime->trigger_master = substream;
1100 return 0;
1101 }
1102
snd_pcm_do_stop(struct snd_pcm_substream * substream,int state)1103 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1104 {
1105 if (substream->runtime->trigger_master == substream &&
1106 snd_pcm_running(substream))
1107 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1108 return 0; /* unconditonally stop all substreams */
1109 }
1110
snd_pcm_post_stop(struct snd_pcm_substream * substream,int state)1111 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1112 {
1113 struct snd_pcm_runtime *runtime = substream->runtime;
1114 if (runtime->status->state != state) {
1115 snd_pcm_trigger_tstamp(substream);
1116 runtime->status->state = state;
1117 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1118 }
1119 wake_up(&runtime->sleep);
1120 wake_up(&runtime->tsleep);
1121 }
1122
1123 static struct action_ops snd_pcm_action_stop = {
1124 .pre_action = snd_pcm_pre_stop,
1125 .do_action = snd_pcm_do_stop,
1126 .post_action = snd_pcm_post_stop
1127 };
1128
1129 /**
1130 * snd_pcm_stop - try to stop all running streams in the substream group
1131 * @substream: the PCM substream instance
1132 * @state: PCM state after stopping the stream
1133 *
1134 * The state of each stream is then changed to the given state unconditionally.
1135 *
1136 * Return: Zero if successful, or a negative error code.
1137 */
snd_pcm_stop(struct snd_pcm_substream * substream,snd_pcm_state_t state)1138 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1139 {
1140 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1141 }
1142
1143 EXPORT_SYMBOL(snd_pcm_stop);
1144
1145 /**
1146 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1147 * @substream: the PCM substream
1148 *
1149 * After stopping, the state is changed to SETUP.
1150 * Unlike snd_pcm_stop(), this affects only the given stream.
1151 *
1152 * Return: Zero if succesful, or a negative error code.
1153 */
snd_pcm_drain_done(struct snd_pcm_substream * substream)1154 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1155 {
1156 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1157 SNDRV_PCM_STATE_SETUP);
1158 }
1159
1160 /**
1161 * snd_pcm_stop_xrun - stop the running streams as XRUN
1162 * @substream: the PCM substream instance
1163 *
1164 * This stops the given running substream (and all linked substreams) as XRUN.
1165 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1166 *
1167 * Return: Zero if successful, or a negative error code.
1168 */
snd_pcm_stop_xrun(struct snd_pcm_substream * substream)1169 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1170 {
1171 unsigned long flags;
1172 int ret = 0;
1173
1174 snd_pcm_stream_lock_irqsave(substream, flags);
1175 if (snd_pcm_running(substream))
1176 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1177 snd_pcm_stream_unlock_irqrestore(substream, flags);
1178 return ret;
1179 }
1180 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1181
1182 /*
1183 * pause callbacks
1184 */
snd_pcm_pre_pause(struct snd_pcm_substream * substream,int push)1185 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1186 {
1187 struct snd_pcm_runtime *runtime = substream->runtime;
1188 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1189 return -ENOSYS;
1190 if (push) {
1191 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1192 return -EBADFD;
1193 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1194 return -EBADFD;
1195 runtime->trigger_master = substream;
1196 return 0;
1197 }
1198
snd_pcm_do_pause(struct snd_pcm_substream * substream,int push)1199 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1200 {
1201 if (substream->runtime->trigger_master != substream)
1202 return 0;
1203 /* some drivers might use hw_ptr to recover from the pause -
1204 update the hw_ptr now */
1205 if (push)
1206 snd_pcm_update_hw_ptr(substream);
1207 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1208 * a delta between the current jiffies, this gives a large enough
1209 * delta, effectively to skip the check once.
1210 */
1211 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1212 return substream->ops->trigger(substream,
1213 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1214 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1215 }
1216
snd_pcm_undo_pause(struct snd_pcm_substream * substream,int push)1217 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1218 {
1219 if (substream->runtime->trigger_master == substream)
1220 substream->ops->trigger(substream,
1221 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1222 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1223 }
1224
snd_pcm_post_pause(struct snd_pcm_substream * substream,int push)1225 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1226 {
1227 struct snd_pcm_runtime *runtime = substream->runtime;
1228 snd_pcm_trigger_tstamp(substream);
1229 if (push) {
1230 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1231 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1232 wake_up(&runtime->sleep);
1233 wake_up(&runtime->tsleep);
1234 } else {
1235 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1236 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1237 }
1238 }
1239
1240 static struct action_ops snd_pcm_action_pause = {
1241 .pre_action = snd_pcm_pre_pause,
1242 .do_action = snd_pcm_do_pause,
1243 .undo_action = snd_pcm_undo_pause,
1244 .post_action = snd_pcm_post_pause
1245 };
1246
1247 /*
1248 * Push/release the pause for all linked streams.
1249 */
snd_pcm_pause(struct snd_pcm_substream * substream,int push)1250 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1251 {
1252 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1253 }
1254
1255 #ifdef CONFIG_PM
1256 /* suspend */
1257
snd_pcm_pre_suspend(struct snd_pcm_substream * substream,int state)1258 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1259 {
1260 struct snd_pcm_runtime *runtime = substream->runtime;
1261 switch (runtime->status->state) {
1262 case SNDRV_PCM_STATE_SUSPENDED:
1263 return -EBUSY;
1264 /* unresumable PCM state; return -EBUSY for skipping suspend */
1265 case SNDRV_PCM_STATE_OPEN:
1266 case SNDRV_PCM_STATE_SETUP:
1267 case SNDRV_PCM_STATE_DISCONNECTED:
1268 return -EBUSY;
1269 }
1270 runtime->trigger_master = substream;
1271 return 0;
1272 }
1273
snd_pcm_do_suspend(struct snd_pcm_substream * substream,int state)1274 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1275 {
1276 struct snd_pcm_runtime *runtime = substream->runtime;
1277 if (runtime->trigger_master != substream)
1278 return 0;
1279 if (! snd_pcm_running(substream))
1280 return 0;
1281 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1282 return 0; /* suspend unconditionally */
1283 }
1284
snd_pcm_post_suspend(struct snd_pcm_substream * substream,int state)1285 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1286 {
1287 struct snd_pcm_runtime *runtime = substream->runtime;
1288 snd_pcm_trigger_tstamp(substream);
1289 runtime->status->suspended_state = runtime->status->state;
1290 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1291 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1292 wake_up(&runtime->sleep);
1293 wake_up(&runtime->tsleep);
1294 }
1295
1296 static struct action_ops snd_pcm_action_suspend = {
1297 .pre_action = snd_pcm_pre_suspend,
1298 .do_action = snd_pcm_do_suspend,
1299 .post_action = snd_pcm_post_suspend
1300 };
1301
1302 /**
1303 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1304 * @substream: the PCM substream
1305 *
1306 * After this call, all streams are changed to SUSPENDED state.
1307 *
1308 * Return: Zero if successful (or @substream is %NULL), or a negative error
1309 * code.
1310 */
snd_pcm_suspend(struct snd_pcm_substream * substream)1311 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1312 {
1313 int err;
1314 unsigned long flags;
1315
1316 if (! substream)
1317 return 0;
1318
1319 snd_pcm_stream_lock_irqsave(substream, flags);
1320 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1321 snd_pcm_stream_unlock_irqrestore(substream, flags);
1322 return err;
1323 }
1324
1325 EXPORT_SYMBOL(snd_pcm_suspend);
1326
1327 /**
1328 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1329 * @pcm: the PCM instance
1330 *
1331 * After this call, all streams are changed to SUSPENDED state.
1332 *
1333 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1334 */
snd_pcm_suspend_all(struct snd_pcm * pcm)1335 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1336 {
1337 struct snd_pcm_substream *substream;
1338 int stream, err = 0;
1339
1340 if (! pcm)
1341 return 0;
1342
1343 for (stream = 0; stream < 2; stream++) {
1344 for (substream = pcm->streams[stream].substream;
1345 substream; substream = substream->next) {
1346 /* FIXME: the open/close code should lock this as well */
1347 if (substream->runtime == NULL)
1348 continue;
1349
1350 /*
1351 * Skip BE dai link PCM's that are internal and may
1352 * not have their substream ops set.
1353 */
1354 if (!substream->ops)
1355 continue;
1356
1357 err = snd_pcm_suspend(substream);
1358 if (err < 0 && err != -EBUSY)
1359 return err;
1360 }
1361 }
1362 return 0;
1363 }
1364
1365 EXPORT_SYMBOL(snd_pcm_suspend_all);
1366
1367 /* resume */
1368
snd_pcm_pre_resume(struct snd_pcm_substream * substream,int state)1369 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1370 {
1371 struct snd_pcm_runtime *runtime = substream->runtime;
1372 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1373 return -ENOSYS;
1374 runtime->trigger_master = substream;
1375 return 0;
1376 }
1377
snd_pcm_do_resume(struct snd_pcm_substream * substream,int state)1378 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1379 {
1380 struct snd_pcm_runtime *runtime = substream->runtime;
1381 if (runtime->trigger_master != substream)
1382 return 0;
1383 /* DMA not running previously? */
1384 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1385 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1386 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1387 return 0;
1388 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1389 }
1390
snd_pcm_undo_resume(struct snd_pcm_substream * substream,int state)1391 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1392 {
1393 if (substream->runtime->trigger_master == substream &&
1394 snd_pcm_running(substream))
1395 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1396 }
1397
snd_pcm_post_resume(struct snd_pcm_substream * substream,int state)1398 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1399 {
1400 struct snd_pcm_runtime *runtime = substream->runtime;
1401 snd_pcm_trigger_tstamp(substream);
1402 runtime->status->state = runtime->status->suspended_state;
1403 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1404 }
1405
1406 static struct action_ops snd_pcm_action_resume = {
1407 .pre_action = snd_pcm_pre_resume,
1408 .do_action = snd_pcm_do_resume,
1409 .undo_action = snd_pcm_undo_resume,
1410 .post_action = snd_pcm_post_resume
1411 };
1412
snd_pcm_resume(struct snd_pcm_substream * substream)1413 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1414 {
1415 struct snd_card *card = substream->pcm->card;
1416 int res;
1417
1418 snd_power_lock(card);
1419 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1420 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1421 snd_power_unlock(card);
1422 return res;
1423 }
1424
1425 #else
1426
snd_pcm_resume(struct snd_pcm_substream * substream)1427 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1428 {
1429 return -ENOSYS;
1430 }
1431
1432 #endif /* CONFIG_PM */
1433
1434 /*
1435 * xrun ioctl
1436 *
1437 * Change the RUNNING stream(s) to XRUN state.
1438 */
snd_pcm_xrun(struct snd_pcm_substream * substream)1439 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1440 {
1441 struct snd_card *card = substream->pcm->card;
1442 struct snd_pcm_runtime *runtime = substream->runtime;
1443 int result;
1444
1445 snd_power_lock(card);
1446 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1447 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1448 if (result < 0)
1449 goto _unlock;
1450 }
1451
1452 snd_pcm_stream_lock_irq(substream);
1453 switch (runtime->status->state) {
1454 case SNDRV_PCM_STATE_XRUN:
1455 result = 0; /* already there */
1456 break;
1457 case SNDRV_PCM_STATE_RUNNING:
1458 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1459 break;
1460 default:
1461 result = -EBADFD;
1462 }
1463 snd_pcm_stream_unlock_irq(substream);
1464 _unlock:
1465 snd_power_unlock(card);
1466 return result;
1467 }
1468
1469 /*
1470 * reset ioctl
1471 */
snd_pcm_pre_reset(struct snd_pcm_substream * substream,int state)1472 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1473 {
1474 struct snd_pcm_runtime *runtime = substream->runtime;
1475 switch (runtime->status->state) {
1476 case SNDRV_PCM_STATE_RUNNING:
1477 case SNDRV_PCM_STATE_PREPARED:
1478 case SNDRV_PCM_STATE_PAUSED:
1479 case SNDRV_PCM_STATE_SUSPENDED:
1480 return 0;
1481 default:
1482 return -EBADFD;
1483 }
1484 }
1485
snd_pcm_do_reset(struct snd_pcm_substream * substream,int state)1486 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1487 {
1488 struct snd_pcm_runtime *runtime = substream->runtime;
1489 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1490 if (err < 0)
1491 return err;
1492 runtime->hw_ptr_base = 0;
1493 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1494 runtime->status->hw_ptr % runtime->period_size;
1495 runtime->silence_start = runtime->status->hw_ptr;
1496 runtime->silence_filled = 0;
1497 return 0;
1498 }
1499
snd_pcm_post_reset(struct snd_pcm_substream * substream,int state)1500 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1501 {
1502 struct snd_pcm_runtime *runtime = substream->runtime;
1503 runtime->control->appl_ptr = runtime->status->hw_ptr;
1504 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1505 runtime->silence_size > 0)
1506 snd_pcm_playback_silence(substream, ULONG_MAX);
1507 }
1508
1509 static struct action_ops snd_pcm_action_reset = {
1510 .pre_action = snd_pcm_pre_reset,
1511 .do_action = snd_pcm_do_reset,
1512 .post_action = snd_pcm_post_reset
1513 };
1514
snd_pcm_reset(struct snd_pcm_substream * substream)1515 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1516 {
1517 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1518 }
1519
1520 /*
1521 * prepare ioctl
1522 */
1523 /* we use the second argument for updating f_flags */
snd_pcm_pre_prepare(struct snd_pcm_substream * substream,int f_flags)1524 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1525 int f_flags)
1526 {
1527 struct snd_pcm_runtime *runtime = substream->runtime;
1528 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1529 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1530 return -EBADFD;
1531 if (snd_pcm_running(substream))
1532 return -EBUSY;
1533 substream->f_flags = f_flags;
1534 return 0;
1535 }
1536
snd_pcm_do_prepare(struct snd_pcm_substream * substream,int state)1537 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1538 {
1539 int err;
1540 err = substream->ops->prepare(substream);
1541 if (err < 0)
1542 return err;
1543 return snd_pcm_do_reset(substream, 0);
1544 }
1545
snd_pcm_post_prepare(struct snd_pcm_substream * substream,int state)1546 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1547 {
1548 struct snd_pcm_runtime *runtime = substream->runtime;
1549 runtime->control->appl_ptr = runtime->status->hw_ptr;
1550 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1551 }
1552
1553 static struct action_ops snd_pcm_action_prepare = {
1554 .pre_action = snd_pcm_pre_prepare,
1555 .do_action = snd_pcm_do_prepare,
1556 .post_action = snd_pcm_post_prepare
1557 };
1558
1559 /**
1560 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1561 * @substream: the PCM substream instance
1562 * @file: file to refer f_flags
1563 *
1564 * Return: Zero if successful, or a negative error code.
1565 */
snd_pcm_prepare(struct snd_pcm_substream * substream,struct file * file)1566 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1567 struct file *file)
1568 {
1569 int res;
1570 struct snd_card *card = substream->pcm->card;
1571 int f_flags;
1572
1573 if (file)
1574 f_flags = file->f_flags;
1575 else
1576 f_flags = substream->f_flags;
1577
1578 snd_power_lock(card);
1579 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1580 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1581 substream, f_flags);
1582 snd_power_unlock(card);
1583 return res;
1584 }
1585
1586 /*
1587 * drain ioctl
1588 */
1589
snd_pcm_pre_drain_init(struct snd_pcm_substream * substream,int state)1590 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1591 {
1592 struct snd_pcm_runtime *runtime = substream->runtime;
1593 switch (runtime->status->state) {
1594 case SNDRV_PCM_STATE_OPEN:
1595 case SNDRV_PCM_STATE_DISCONNECTED:
1596 case SNDRV_PCM_STATE_SUSPENDED:
1597 return -EBADFD;
1598 }
1599 runtime->trigger_master = substream;
1600 return 0;
1601 }
1602
snd_pcm_do_drain_init(struct snd_pcm_substream * substream,int state)1603 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1604 {
1605 struct snd_pcm_runtime *runtime = substream->runtime;
1606 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1607 switch (runtime->status->state) {
1608 case SNDRV_PCM_STATE_PREPARED:
1609 /* start playback stream if possible */
1610 if (! snd_pcm_playback_empty(substream)) {
1611 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1612 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1613 } else {
1614 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1615 }
1616 break;
1617 case SNDRV_PCM_STATE_RUNNING:
1618 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1619 break;
1620 case SNDRV_PCM_STATE_XRUN:
1621 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1622 break;
1623 default:
1624 break;
1625 }
1626 } else {
1627 /* stop running stream */
1628 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1629 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1630 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1631 snd_pcm_do_stop(substream, new_state);
1632 snd_pcm_post_stop(substream, new_state);
1633 }
1634 }
1635
1636 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1637 runtime->trigger_master == substream &&
1638 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1639 return substream->ops->trigger(substream,
1640 SNDRV_PCM_TRIGGER_DRAIN);
1641
1642 return 0;
1643 }
1644
snd_pcm_post_drain_init(struct snd_pcm_substream * substream,int state)1645 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1646 {
1647 }
1648
1649 static struct action_ops snd_pcm_action_drain_init = {
1650 .pre_action = snd_pcm_pre_drain_init,
1651 .do_action = snd_pcm_do_drain_init,
1652 .post_action = snd_pcm_post_drain_init
1653 };
1654
1655 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1656
1657 /*
1658 * Drain the stream(s).
1659 * When the substream is linked, sync until the draining of all playback streams
1660 * is finished.
1661 * After this call, all streams are supposed to be either SETUP or DRAINING
1662 * (capture only) state.
1663 */
snd_pcm_drain(struct snd_pcm_substream * substream,struct file * file)1664 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1665 struct file *file)
1666 {
1667 struct snd_card *card;
1668 struct snd_pcm_runtime *runtime;
1669 struct snd_pcm_substream *s;
1670 wait_queue_t wait;
1671 int result = 0;
1672 int nonblock = 0;
1673
1674 card = substream->pcm->card;
1675 runtime = substream->runtime;
1676
1677 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1678 return -EBADFD;
1679
1680 snd_power_lock(card);
1681 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1682 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1683 if (result < 0) {
1684 snd_power_unlock(card);
1685 return result;
1686 }
1687 }
1688
1689 if (file) {
1690 if (file->f_flags & O_NONBLOCK)
1691 nonblock = 1;
1692 } else if (substream->f_flags & O_NONBLOCK)
1693 nonblock = 1;
1694
1695 down_read(&snd_pcm_link_rwsem);
1696 snd_pcm_stream_lock_irq(substream);
1697 /* resume pause */
1698 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1699 snd_pcm_pause(substream, 0);
1700
1701 /* pre-start/stop - all running streams are changed to DRAINING state */
1702 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1703 if (result < 0)
1704 goto unlock;
1705 /* in non-blocking, we don't wait in ioctl but let caller poll */
1706 if (nonblock) {
1707 result = -EAGAIN;
1708 goto unlock;
1709 }
1710
1711 for (;;) {
1712 long tout;
1713 struct snd_pcm_runtime *to_check;
1714 if (signal_pending(current)) {
1715 result = -ERESTARTSYS;
1716 break;
1717 }
1718 /* find a substream to drain */
1719 to_check = NULL;
1720 snd_pcm_group_for_each_entry(s, substream) {
1721 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1722 continue;
1723 runtime = s->runtime;
1724 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1725 to_check = runtime;
1726 break;
1727 }
1728 }
1729 if (!to_check)
1730 break; /* all drained */
1731 init_waitqueue_entry(&wait, current);
1732 add_wait_queue(&to_check->sleep, &wait);
1733 snd_pcm_stream_unlock_irq(substream);
1734 up_read(&snd_pcm_link_rwsem);
1735 snd_power_unlock(card);
1736 if (runtime->no_period_wakeup)
1737 tout = MAX_SCHEDULE_TIMEOUT;
1738 else {
1739 tout = 10;
1740 if (runtime->rate) {
1741 long t = runtime->period_size * 2 / runtime->rate;
1742 tout = max(t, tout);
1743 }
1744 tout = msecs_to_jiffies(tout * 1000);
1745 }
1746 tout = schedule_timeout_interruptible(tout);
1747 snd_power_lock(card);
1748 down_read(&snd_pcm_link_rwsem);
1749 snd_pcm_stream_lock_irq(substream);
1750 remove_wait_queue(&to_check->sleep, &wait);
1751 if (card->shutdown) {
1752 result = -ENODEV;
1753 break;
1754 }
1755 if (tout == 0) {
1756 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1757 result = -ESTRPIPE;
1758 else {
1759 dev_dbg(substream->pcm->card->dev,
1760 "playback drain error (DMA or IRQ trouble?)\n");
1761 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1762 result = -EIO;
1763 }
1764 break;
1765 }
1766 }
1767
1768 unlock:
1769 snd_pcm_stream_unlock_irq(substream);
1770 up_read(&snd_pcm_link_rwsem);
1771 snd_power_unlock(card);
1772
1773 return result;
1774 }
1775
1776 /*
1777 * drop ioctl
1778 *
1779 * Immediately put all linked substreams into SETUP state.
1780 */
snd_pcm_drop(struct snd_pcm_substream * substream)1781 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1782 {
1783 struct snd_pcm_runtime *runtime;
1784 int result = 0;
1785
1786 if (PCM_RUNTIME_CHECK(substream))
1787 return -ENXIO;
1788 runtime = substream->runtime;
1789
1790 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1791 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1792 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1793 return -EBADFD;
1794
1795 snd_pcm_stream_lock_irq(substream);
1796 /* resume pause */
1797 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1798 snd_pcm_pause(substream, 0);
1799
1800 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1801 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1802 snd_pcm_stream_unlock_irq(substream);
1803
1804 return result;
1805 }
1806
1807
is_pcm_file(struct file * file)1808 static bool is_pcm_file(struct file *file)
1809 {
1810 struct inode *inode = file_inode(file);
1811 unsigned int minor;
1812
1813 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1814 return false;
1815 minor = iminor(inode);
1816 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1817 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1818 }
1819
1820 /*
1821 * PCM link handling
1822 */
snd_pcm_link(struct snd_pcm_substream * substream,int fd)1823 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1824 {
1825 int res = 0;
1826 struct snd_pcm_file *pcm_file;
1827 struct snd_pcm_substream *substream1;
1828 struct snd_pcm_group *group;
1829 struct fd f = fdget(fd);
1830
1831 if (!f.file)
1832 return -EBADFD;
1833 if (!is_pcm_file(f.file)) {
1834 res = -EBADFD;
1835 goto _badf;
1836 }
1837 pcm_file = f.file->private_data;
1838 substream1 = pcm_file->substream;
1839 if (substream == substream1) {
1840 res = -EINVAL;
1841 goto _badf;
1842 }
1843
1844 group = kmalloc(sizeof(*group), GFP_KERNEL);
1845 if (!group) {
1846 res = -ENOMEM;
1847 goto _nolock;
1848 }
1849 down_write_nonfifo(&snd_pcm_link_rwsem);
1850 write_lock_irq(&snd_pcm_link_rwlock);
1851 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1852 substream->runtime->status->state != substream1->runtime->status->state ||
1853 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1854 res = -EBADFD;
1855 goto _end;
1856 }
1857 if (snd_pcm_stream_linked(substream1)) {
1858 res = -EALREADY;
1859 goto _end;
1860 }
1861 if (!snd_pcm_stream_linked(substream)) {
1862 substream->group = group;
1863 group = NULL;
1864 spin_lock_init(&substream->group->lock);
1865 mutex_init(&substream->group->mutex);
1866 INIT_LIST_HEAD(&substream->group->substreams);
1867 list_add_tail(&substream->link_list, &substream->group->substreams);
1868 substream->group->count = 1;
1869 }
1870 list_add_tail(&substream1->link_list, &substream->group->substreams);
1871 substream->group->count++;
1872 substream1->group = substream->group;
1873 _end:
1874 write_unlock_irq(&snd_pcm_link_rwlock);
1875 up_write(&snd_pcm_link_rwsem);
1876 _nolock:
1877 snd_card_unref(substream1->pcm->card);
1878 kfree(group);
1879 _badf:
1880 fdput(f);
1881 return res;
1882 }
1883
relink_to_local(struct snd_pcm_substream * substream)1884 static void relink_to_local(struct snd_pcm_substream *substream)
1885 {
1886 substream->group = &substream->self_group;
1887 INIT_LIST_HEAD(&substream->self_group.substreams);
1888 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1889 }
1890
snd_pcm_unlink(struct snd_pcm_substream * substream)1891 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1892 {
1893 struct snd_pcm_substream *s;
1894 int res = 0;
1895
1896 down_write_nonfifo(&snd_pcm_link_rwsem);
1897 write_lock_irq(&snd_pcm_link_rwlock);
1898 if (!snd_pcm_stream_linked(substream)) {
1899 res = -EALREADY;
1900 goto _end;
1901 }
1902 list_del(&substream->link_list);
1903 substream->group->count--;
1904 if (substream->group->count == 1) { /* detach the last stream, too */
1905 snd_pcm_group_for_each_entry(s, substream) {
1906 relink_to_local(s);
1907 break;
1908 }
1909 kfree(substream->group);
1910 }
1911 relink_to_local(substream);
1912 _end:
1913 write_unlock_irq(&snd_pcm_link_rwlock);
1914 up_write(&snd_pcm_link_rwsem);
1915 return res;
1916 }
1917
1918 /*
1919 * hw configurator
1920 */
snd_pcm_hw_rule_mul(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1921 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1922 struct snd_pcm_hw_rule *rule)
1923 {
1924 struct snd_interval t;
1925 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1926 hw_param_interval_c(params, rule->deps[1]), &t);
1927 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1928 }
1929
snd_pcm_hw_rule_div(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1930 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1931 struct snd_pcm_hw_rule *rule)
1932 {
1933 struct snd_interval t;
1934 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1935 hw_param_interval_c(params, rule->deps[1]), &t);
1936 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1937 }
1938
snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1939 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1940 struct snd_pcm_hw_rule *rule)
1941 {
1942 struct snd_interval t;
1943 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1944 hw_param_interval_c(params, rule->deps[1]),
1945 (unsigned long) rule->private, &t);
1946 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1947 }
1948
snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1949 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1950 struct snd_pcm_hw_rule *rule)
1951 {
1952 struct snd_interval t;
1953 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1954 (unsigned long) rule->private,
1955 hw_param_interval_c(params, rule->deps[1]), &t);
1956 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1957 }
1958
snd_pcm_hw_rule_format(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1959 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1960 struct snd_pcm_hw_rule *rule)
1961 {
1962 unsigned int k;
1963 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1964 struct snd_mask m;
1965 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1966 snd_mask_any(&m);
1967 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1968 int bits;
1969 if (! snd_mask_test(mask, k))
1970 continue;
1971 bits = snd_pcm_format_physical_width(k);
1972 if (bits <= 0)
1973 continue; /* ignore invalid formats */
1974 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1975 snd_mask_reset(&m, k);
1976 }
1977 return snd_mask_refine(mask, &m);
1978 }
1979
snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1980 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1981 struct snd_pcm_hw_rule *rule)
1982 {
1983 struct snd_interval t;
1984 unsigned int k;
1985 t.min = UINT_MAX;
1986 t.max = 0;
1987 t.openmin = 0;
1988 t.openmax = 0;
1989 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1990 int bits;
1991 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1992 continue;
1993 bits = snd_pcm_format_physical_width(k);
1994 if (bits <= 0)
1995 continue; /* ignore invalid formats */
1996 if (t.min > (unsigned)bits)
1997 t.min = bits;
1998 if (t.max < (unsigned)bits)
1999 t.max = bits;
2000 }
2001 t.integer = 1;
2002 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2003 }
2004
2005 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2006 #error "Change this table"
2007 #endif
2008
2009 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2010 48000, 64000, 88200, 96000, 176400, 192000 };
2011
2012 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2013 .count = ARRAY_SIZE(rates),
2014 .list = rates,
2015 };
2016
snd_pcm_hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2017 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2018 struct snd_pcm_hw_rule *rule)
2019 {
2020 struct snd_pcm_hardware *hw = rule->private;
2021 return snd_interval_list(hw_param_interval(params, rule->var),
2022 snd_pcm_known_rates.count,
2023 snd_pcm_known_rates.list, hw->rates);
2024 }
2025
snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2026 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2027 struct snd_pcm_hw_rule *rule)
2028 {
2029 struct snd_interval t;
2030 struct snd_pcm_substream *substream = rule->private;
2031 t.min = 0;
2032 t.max = substream->buffer_bytes_max;
2033 t.openmin = 0;
2034 t.openmax = 0;
2035 t.integer = 1;
2036 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2037 }
2038
snd_pcm_hw_constraints_init(struct snd_pcm_substream * substream)2039 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2040 {
2041 struct snd_pcm_runtime *runtime = substream->runtime;
2042 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2043 int k, err;
2044
2045 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2046 snd_mask_any(constrs_mask(constrs, k));
2047 }
2048
2049 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2050 snd_interval_any(constrs_interval(constrs, k));
2051 }
2052
2053 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2054 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2055 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2056 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2057 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2058
2059 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2060 snd_pcm_hw_rule_format, NULL,
2061 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2062 if (err < 0)
2063 return err;
2064 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2065 snd_pcm_hw_rule_sample_bits, NULL,
2066 SNDRV_PCM_HW_PARAM_FORMAT,
2067 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2068 if (err < 0)
2069 return err;
2070 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2071 snd_pcm_hw_rule_div, NULL,
2072 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2073 if (err < 0)
2074 return err;
2075 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2076 snd_pcm_hw_rule_mul, NULL,
2077 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2078 if (err < 0)
2079 return err;
2080 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2081 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2082 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2083 if (err < 0)
2084 return err;
2085 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2086 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2087 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2088 if (err < 0)
2089 return err;
2090 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2091 snd_pcm_hw_rule_div, NULL,
2092 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2093 if (err < 0)
2094 return err;
2095 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2096 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2097 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2098 if (err < 0)
2099 return err;
2100 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2101 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2102 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2103 if (err < 0)
2104 return err;
2105 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2106 snd_pcm_hw_rule_div, NULL,
2107 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2108 if (err < 0)
2109 return err;
2110 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2111 snd_pcm_hw_rule_div, NULL,
2112 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2113 if (err < 0)
2114 return err;
2115 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2116 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2117 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2118 if (err < 0)
2119 return err;
2120 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2121 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2122 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2123 if (err < 0)
2124 return err;
2125 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2126 snd_pcm_hw_rule_mul, NULL,
2127 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2128 if (err < 0)
2129 return err;
2130 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2131 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2132 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2133 if (err < 0)
2134 return err;
2135 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2136 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2137 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2138 if (err < 0)
2139 return err;
2140 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2141 snd_pcm_hw_rule_muldivk, (void*) 8,
2142 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2143 if (err < 0)
2144 return err;
2145 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2146 snd_pcm_hw_rule_muldivk, (void*) 8,
2147 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2148 if (err < 0)
2149 return err;
2150 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2151 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2152 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2153 if (err < 0)
2154 return err;
2155 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2156 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2157 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2158 if (err < 0)
2159 return err;
2160 return 0;
2161 }
2162
snd_pcm_hw_constraints_complete(struct snd_pcm_substream * substream)2163 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2164 {
2165 struct snd_pcm_runtime *runtime = substream->runtime;
2166 struct snd_pcm_hardware *hw = &runtime->hw;
2167 int err;
2168 unsigned int mask = 0;
2169
2170 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2171 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2172 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2173 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2174 if (hw_support_mmap(substream)) {
2175 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2176 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2177 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2178 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2179 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2180 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2181 }
2182 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2183 if (err < 0)
2184 return err;
2185
2186 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2187 if (err < 0)
2188 return err;
2189
2190 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2191 if (err < 0)
2192 return err;
2193
2194 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2195 hw->channels_min, hw->channels_max);
2196 if (err < 0)
2197 return err;
2198
2199 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2200 hw->rate_min, hw->rate_max);
2201 if (err < 0)
2202 return err;
2203
2204 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2205 hw->period_bytes_min, hw->period_bytes_max);
2206 if (err < 0)
2207 return err;
2208
2209 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2210 hw->periods_min, hw->periods_max);
2211 if (err < 0)
2212 return err;
2213
2214 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2215 hw->period_bytes_min, hw->buffer_bytes_max);
2216 if (err < 0)
2217 return err;
2218
2219 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2220 snd_pcm_hw_rule_buffer_bytes_max, substream,
2221 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2222 if (err < 0)
2223 return err;
2224
2225 /* FIXME: remove */
2226 if (runtime->dma_bytes) {
2227 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2228 if (err < 0)
2229 return err;
2230 }
2231
2232 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2233 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2234 snd_pcm_hw_rule_rate, hw,
2235 SNDRV_PCM_HW_PARAM_RATE, -1);
2236 if (err < 0)
2237 return err;
2238 }
2239
2240 /* FIXME: this belong to lowlevel */
2241 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2242
2243 return 0;
2244 }
2245
pcm_release_private(struct snd_pcm_substream * substream)2246 static void pcm_release_private(struct snd_pcm_substream *substream)
2247 {
2248 if (snd_pcm_stream_linked(substream))
2249 snd_pcm_unlink(substream);
2250 }
2251
snd_pcm_release_substream(struct snd_pcm_substream * substream)2252 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2253 {
2254 substream->ref_count--;
2255 if (substream->ref_count > 0)
2256 return;
2257
2258 snd_pcm_drop(substream);
2259 if (substream->hw_opened) {
2260 if (substream->ops->hw_free &&
2261 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2262 substream->ops->hw_free(substream);
2263 substream->ops->close(substream);
2264 substream->hw_opened = 0;
2265 }
2266 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2267 pm_qos_remove_request(&substream->latency_pm_qos_req);
2268 if (substream->pcm_release) {
2269 substream->pcm_release(substream);
2270 substream->pcm_release = NULL;
2271 }
2272 snd_pcm_detach_substream(substream);
2273 }
2274
2275 EXPORT_SYMBOL(snd_pcm_release_substream);
2276
snd_pcm_open_substream(struct snd_pcm * pcm,int stream,struct file * file,struct snd_pcm_substream ** rsubstream)2277 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2278 struct file *file,
2279 struct snd_pcm_substream **rsubstream)
2280 {
2281 struct snd_pcm_substream *substream;
2282 int err;
2283
2284 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2285 if (err < 0)
2286 return err;
2287 if (substream->ref_count > 1) {
2288 *rsubstream = substream;
2289 return 0;
2290 }
2291
2292 err = snd_pcm_hw_constraints_init(substream);
2293 if (err < 0) {
2294 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2295 goto error;
2296 }
2297
2298 if ((err = substream->ops->open(substream)) < 0)
2299 goto error;
2300
2301 substream->hw_opened = 1;
2302
2303 err = snd_pcm_hw_constraints_complete(substream);
2304 if (err < 0) {
2305 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2306 goto error;
2307 }
2308
2309 *rsubstream = substream;
2310 return 0;
2311
2312 error:
2313 snd_pcm_release_substream(substream);
2314 return err;
2315 }
2316
2317 EXPORT_SYMBOL(snd_pcm_open_substream);
2318
snd_pcm_open_file(struct file * file,struct snd_pcm * pcm,int stream)2319 static int snd_pcm_open_file(struct file *file,
2320 struct snd_pcm *pcm,
2321 int stream)
2322 {
2323 struct snd_pcm_file *pcm_file;
2324 struct snd_pcm_substream *substream;
2325 int err;
2326
2327 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2328 if (err < 0)
2329 return err;
2330
2331 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2332 if (pcm_file == NULL) {
2333 snd_pcm_release_substream(substream);
2334 return -ENOMEM;
2335 }
2336 pcm_file->substream = substream;
2337 if (substream->ref_count == 1) {
2338 substream->file = pcm_file;
2339 substream->pcm_release = pcm_release_private;
2340 }
2341 file->private_data = pcm_file;
2342
2343 return 0;
2344 }
2345
snd_pcm_playback_open(struct inode * inode,struct file * file)2346 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2347 {
2348 struct snd_pcm *pcm;
2349 int err = nonseekable_open(inode, file);
2350 if (err < 0)
2351 return err;
2352 pcm = snd_lookup_minor_data(iminor(inode),
2353 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2354 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2355 if (pcm)
2356 snd_card_unref(pcm->card);
2357 return err;
2358 }
2359
snd_pcm_capture_open(struct inode * inode,struct file * file)2360 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2361 {
2362 struct snd_pcm *pcm;
2363 int err = nonseekable_open(inode, file);
2364 if (err < 0)
2365 return err;
2366 pcm = snd_lookup_minor_data(iminor(inode),
2367 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2368 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2369 if (pcm)
2370 snd_card_unref(pcm->card);
2371 return err;
2372 }
2373
snd_pcm_open(struct file * file,struct snd_pcm * pcm,int stream)2374 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2375 {
2376 int err;
2377 wait_queue_t wait;
2378
2379 if (pcm == NULL) {
2380 err = -ENODEV;
2381 goto __error1;
2382 }
2383 err = snd_card_file_add(pcm->card, file);
2384 if (err < 0)
2385 goto __error1;
2386 if (!try_module_get(pcm->card->module)) {
2387 err = -EFAULT;
2388 goto __error2;
2389 }
2390 init_waitqueue_entry(&wait, current);
2391 add_wait_queue(&pcm->open_wait, &wait);
2392 mutex_lock(&pcm->open_mutex);
2393 while (1) {
2394 err = snd_pcm_open_file(file, pcm, stream);
2395 if (err >= 0)
2396 break;
2397 if (err == -EAGAIN) {
2398 if (file->f_flags & O_NONBLOCK) {
2399 err = -EBUSY;
2400 break;
2401 }
2402 } else
2403 break;
2404 set_current_state(TASK_INTERRUPTIBLE);
2405 mutex_unlock(&pcm->open_mutex);
2406 schedule();
2407 mutex_lock(&pcm->open_mutex);
2408 if (pcm->card->shutdown) {
2409 err = -ENODEV;
2410 break;
2411 }
2412 if (signal_pending(current)) {
2413 err = -ERESTARTSYS;
2414 break;
2415 }
2416 }
2417 remove_wait_queue(&pcm->open_wait, &wait);
2418 mutex_unlock(&pcm->open_mutex);
2419 if (err < 0)
2420 goto __error;
2421 return err;
2422
2423 __error:
2424 module_put(pcm->card->module);
2425 __error2:
2426 snd_card_file_remove(pcm->card, file);
2427 __error1:
2428 return err;
2429 }
2430
snd_pcm_release(struct inode * inode,struct file * file)2431 static int snd_pcm_release(struct inode *inode, struct file *file)
2432 {
2433 struct snd_pcm *pcm;
2434 struct snd_pcm_substream *substream;
2435 struct snd_pcm_file *pcm_file;
2436
2437 pcm_file = file->private_data;
2438 substream = pcm_file->substream;
2439 if (snd_BUG_ON(!substream))
2440 return -ENXIO;
2441 pcm = substream->pcm;
2442 mutex_lock(&pcm->open_mutex);
2443 snd_pcm_release_substream(substream);
2444 kfree(pcm_file);
2445 mutex_unlock(&pcm->open_mutex);
2446 wake_up(&pcm->open_wait);
2447 module_put(pcm->card->module);
2448 snd_card_file_remove(pcm->card, file);
2449 return 0;
2450 }
2451
snd_pcm_playback_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2452 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2453 snd_pcm_uframes_t frames)
2454 {
2455 struct snd_pcm_runtime *runtime = substream->runtime;
2456 snd_pcm_sframes_t appl_ptr;
2457 snd_pcm_sframes_t ret;
2458 snd_pcm_sframes_t hw_avail;
2459
2460 if (frames == 0)
2461 return 0;
2462
2463 snd_pcm_stream_lock_irq(substream);
2464 switch (runtime->status->state) {
2465 case SNDRV_PCM_STATE_PREPARED:
2466 break;
2467 case SNDRV_PCM_STATE_DRAINING:
2468 case SNDRV_PCM_STATE_RUNNING:
2469 if (snd_pcm_update_hw_ptr(substream) >= 0)
2470 break;
2471 /* Fall through */
2472 case SNDRV_PCM_STATE_XRUN:
2473 ret = -EPIPE;
2474 goto __end;
2475 case SNDRV_PCM_STATE_SUSPENDED:
2476 ret = -ESTRPIPE;
2477 goto __end;
2478 default:
2479 ret = -EBADFD;
2480 goto __end;
2481 }
2482
2483 hw_avail = snd_pcm_playback_hw_avail(runtime);
2484 if (hw_avail <= 0) {
2485 ret = 0;
2486 goto __end;
2487 }
2488 if (frames > (snd_pcm_uframes_t)hw_avail)
2489 frames = hw_avail;
2490 appl_ptr = runtime->control->appl_ptr - frames;
2491 if (appl_ptr < 0)
2492 appl_ptr += runtime->boundary;
2493 runtime->control->appl_ptr = appl_ptr;
2494 ret = frames;
2495 __end:
2496 snd_pcm_stream_unlock_irq(substream);
2497 return ret;
2498 }
2499
snd_pcm_capture_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2500 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2501 snd_pcm_uframes_t frames)
2502 {
2503 struct snd_pcm_runtime *runtime = substream->runtime;
2504 snd_pcm_sframes_t appl_ptr;
2505 snd_pcm_sframes_t ret;
2506 snd_pcm_sframes_t hw_avail;
2507
2508 if (frames == 0)
2509 return 0;
2510
2511 snd_pcm_stream_lock_irq(substream);
2512 switch (runtime->status->state) {
2513 case SNDRV_PCM_STATE_PREPARED:
2514 case SNDRV_PCM_STATE_DRAINING:
2515 break;
2516 case SNDRV_PCM_STATE_RUNNING:
2517 if (snd_pcm_update_hw_ptr(substream) >= 0)
2518 break;
2519 /* Fall through */
2520 case SNDRV_PCM_STATE_XRUN:
2521 ret = -EPIPE;
2522 goto __end;
2523 case SNDRV_PCM_STATE_SUSPENDED:
2524 ret = -ESTRPIPE;
2525 goto __end;
2526 default:
2527 ret = -EBADFD;
2528 goto __end;
2529 }
2530
2531 hw_avail = snd_pcm_capture_hw_avail(runtime);
2532 if (hw_avail <= 0) {
2533 ret = 0;
2534 goto __end;
2535 }
2536 if (frames > (snd_pcm_uframes_t)hw_avail)
2537 frames = hw_avail;
2538 appl_ptr = runtime->control->appl_ptr - frames;
2539 if (appl_ptr < 0)
2540 appl_ptr += runtime->boundary;
2541 runtime->control->appl_ptr = appl_ptr;
2542 ret = frames;
2543 __end:
2544 snd_pcm_stream_unlock_irq(substream);
2545 return ret;
2546 }
2547
snd_pcm_playback_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2548 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2549 snd_pcm_uframes_t frames)
2550 {
2551 struct snd_pcm_runtime *runtime = substream->runtime;
2552 snd_pcm_sframes_t appl_ptr;
2553 snd_pcm_sframes_t ret;
2554 snd_pcm_sframes_t avail;
2555
2556 if (frames == 0)
2557 return 0;
2558
2559 snd_pcm_stream_lock_irq(substream);
2560 switch (runtime->status->state) {
2561 case SNDRV_PCM_STATE_PREPARED:
2562 case SNDRV_PCM_STATE_PAUSED:
2563 break;
2564 case SNDRV_PCM_STATE_DRAINING:
2565 case SNDRV_PCM_STATE_RUNNING:
2566 if (snd_pcm_update_hw_ptr(substream) >= 0)
2567 break;
2568 /* Fall through */
2569 case SNDRV_PCM_STATE_XRUN:
2570 ret = -EPIPE;
2571 goto __end;
2572 case SNDRV_PCM_STATE_SUSPENDED:
2573 ret = -ESTRPIPE;
2574 goto __end;
2575 default:
2576 ret = -EBADFD;
2577 goto __end;
2578 }
2579
2580 avail = snd_pcm_playback_avail(runtime);
2581 if (avail <= 0) {
2582 ret = 0;
2583 goto __end;
2584 }
2585 if (frames > (snd_pcm_uframes_t)avail)
2586 frames = avail;
2587 appl_ptr = runtime->control->appl_ptr + frames;
2588 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2589 appl_ptr -= runtime->boundary;
2590 runtime->control->appl_ptr = appl_ptr;
2591 ret = frames;
2592 __end:
2593 snd_pcm_stream_unlock_irq(substream);
2594 return ret;
2595 }
2596
snd_pcm_capture_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2597 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2598 snd_pcm_uframes_t frames)
2599 {
2600 struct snd_pcm_runtime *runtime = substream->runtime;
2601 snd_pcm_sframes_t appl_ptr;
2602 snd_pcm_sframes_t ret;
2603 snd_pcm_sframes_t avail;
2604
2605 if (frames == 0)
2606 return 0;
2607
2608 snd_pcm_stream_lock_irq(substream);
2609 switch (runtime->status->state) {
2610 case SNDRV_PCM_STATE_PREPARED:
2611 case SNDRV_PCM_STATE_DRAINING:
2612 case SNDRV_PCM_STATE_PAUSED:
2613 break;
2614 case SNDRV_PCM_STATE_RUNNING:
2615 if (snd_pcm_update_hw_ptr(substream) >= 0)
2616 break;
2617 /* Fall through */
2618 case SNDRV_PCM_STATE_XRUN:
2619 ret = -EPIPE;
2620 goto __end;
2621 case SNDRV_PCM_STATE_SUSPENDED:
2622 ret = -ESTRPIPE;
2623 goto __end;
2624 default:
2625 ret = -EBADFD;
2626 goto __end;
2627 }
2628
2629 avail = snd_pcm_capture_avail(runtime);
2630 if (avail <= 0) {
2631 ret = 0;
2632 goto __end;
2633 }
2634 if (frames > (snd_pcm_uframes_t)avail)
2635 frames = avail;
2636 appl_ptr = runtime->control->appl_ptr + frames;
2637 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2638 appl_ptr -= runtime->boundary;
2639 runtime->control->appl_ptr = appl_ptr;
2640 ret = frames;
2641 __end:
2642 snd_pcm_stream_unlock_irq(substream);
2643 return ret;
2644 }
2645
snd_pcm_hwsync(struct snd_pcm_substream * substream)2646 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2647 {
2648 struct snd_pcm_runtime *runtime = substream->runtime;
2649 int err;
2650
2651 snd_pcm_stream_lock_irq(substream);
2652 switch (runtime->status->state) {
2653 case SNDRV_PCM_STATE_DRAINING:
2654 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2655 goto __badfd;
2656 /* Fall through */
2657 case SNDRV_PCM_STATE_RUNNING:
2658 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2659 break;
2660 /* Fall through */
2661 case SNDRV_PCM_STATE_PREPARED:
2662 case SNDRV_PCM_STATE_SUSPENDED:
2663 err = 0;
2664 break;
2665 case SNDRV_PCM_STATE_XRUN:
2666 err = -EPIPE;
2667 break;
2668 default:
2669 __badfd:
2670 err = -EBADFD;
2671 break;
2672 }
2673 snd_pcm_stream_unlock_irq(substream);
2674 return err;
2675 }
2676
snd_pcm_delay(struct snd_pcm_substream * substream,snd_pcm_sframes_t __user * res)2677 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2678 snd_pcm_sframes_t __user *res)
2679 {
2680 struct snd_pcm_runtime *runtime = substream->runtime;
2681 int err;
2682 snd_pcm_sframes_t n = 0;
2683
2684 snd_pcm_stream_lock_irq(substream);
2685 switch (runtime->status->state) {
2686 case SNDRV_PCM_STATE_DRAINING:
2687 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2688 goto __badfd;
2689 /* Fall through */
2690 case SNDRV_PCM_STATE_RUNNING:
2691 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2692 break;
2693 /* Fall through */
2694 case SNDRV_PCM_STATE_PREPARED:
2695 case SNDRV_PCM_STATE_SUSPENDED:
2696 err = 0;
2697 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2698 n = snd_pcm_playback_hw_avail(runtime);
2699 else
2700 n = snd_pcm_capture_avail(runtime);
2701 n += runtime->delay;
2702 break;
2703 case SNDRV_PCM_STATE_XRUN:
2704 err = -EPIPE;
2705 break;
2706 default:
2707 __badfd:
2708 err = -EBADFD;
2709 break;
2710 }
2711 snd_pcm_stream_unlock_irq(substream);
2712 if (!err)
2713 if (put_user(n, res))
2714 err = -EFAULT;
2715 return err;
2716 }
2717
snd_pcm_sync_ptr(struct snd_pcm_substream * substream,struct snd_pcm_sync_ptr __user * _sync_ptr)2718 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2719 struct snd_pcm_sync_ptr __user *_sync_ptr)
2720 {
2721 struct snd_pcm_runtime *runtime = substream->runtime;
2722 struct snd_pcm_sync_ptr sync_ptr;
2723 volatile struct snd_pcm_mmap_status *status;
2724 volatile struct snd_pcm_mmap_control *control;
2725 int err;
2726
2727 memset(&sync_ptr, 0, sizeof(sync_ptr));
2728 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2729 return -EFAULT;
2730 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2731 return -EFAULT;
2732 status = runtime->status;
2733 control = runtime->control;
2734 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2735 err = snd_pcm_hwsync(substream);
2736 if (err < 0)
2737 return err;
2738 }
2739 snd_pcm_stream_lock_irq(substream);
2740 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2741 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2742 else
2743 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2744 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2745 control->avail_min = sync_ptr.c.control.avail_min;
2746 else
2747 sync_ptr.c.control.avail_min = control->avail_min;
2748 sync_ptr.s.status.state = status->state;
2749 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2750 sync_ptr.s.status.tstamp = status->tstamp;
2751 sync_ptr.s.status.suspended_state = status->suspended_state;
2752 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2753 snd_pcm_stream_unlock_irq(substream);
2754 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2755 return -EFAULT;
2756 return 0;
2757 }
2758
snd_pcm_tstamp(struct snd_pcm_substream * substream,int __user * _arg)2759 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2760 {
2761 struct snd_pcm_runtime *runtime = substream->runtime;
2762 int arg;
2763
2764 if (get_user(arg, _arg))
2765 return -EFAULT;
2766 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2767 return -EINVAL;
2768 runtime->tstamp_type = arg;
2769 return 0;
2770 }
2771
snd_pcm_common_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2772 static int snd_pcm_common_ioctl1(struct file *file,
2773 struct snd_pcm_substream *substream,
2774 unsigned int cmd, void __user *arg)
2775 {
2776 switch (cmd) {
2777 case SNDRV_PCM_IOCTL_PVERSION:
2778 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2779 case SNDRV_PCM_IOCTL_INFO:
2780 return snd_pcm_info_user(substream, arg);
2781 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2782 return 0;
2783 case SNDRV_PCM_IOCTL_TTSTAMP:
2784 return snd_pcm_tstamp(substream, arg);
2785 case SNDRV_PCM_IOCTL_HW_REFINE:
2786 return snd_pcm_hw_refine_user(substream, arg);
2787 case SNDRV_PCM_IOCTL_HW_PARAMS:
2788 return snd_pcm_hw_params_user(substream, arg);
2789 case SNDRV_PCM_IOCTL_HW_FREE:
2790 return snd_pcm_hw_free(substream);
2791 case SNDRV_PCM_IOCTL_SW_PARAMS:
2792 return snd_pcm_sw_params_user(substream, arg);
2793 case SNDRV_PCM_IOCTL_STATUS:
2794 return snd_pcm_status_user(substream, arg, false);
2795 case SNDRV_PCM_IOCTL_STATUS_EXT:
2796 return snd_pcm_status_user(substream, arg, true);
2797 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2798 return snd_pcm_channel_info_user(substream, arg);
2799 case SNDRV_PCM_IOCTL_PREPARE:
2800 return snd_pcm_prepare(substream, file);
2801 case SNDRV_PCM_IOCTL_RESET:
2802 return snd_pcm_reset(substream);
2803 case SNDRV_PCM_IOCTL_START:
2804 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2805 case SNDRV_PCM_IOCTL_LINK:
2806 return snd_pcm_link(substream, (int)(unsigned long) arg);
2807 case SNDRV_PCM_IOCTL_UNLINK:
2808 return snd_pcm_unlink(substream);
2809 case SNDRV_PCM_IOCTL_RESUME:
2810 return snd_pcm_resume(substream);
2811 case SNDRV_PCM_IOCTL_XRUN:
2812 return snd_pcm_xrun(substream);
2813 case SNDRV_PCM_IOCTL_HWSYNC:
2814 return snd_pcm_hwsync(substream);
2815 case SNDRV_PCM_IOCTL_DELAY:
2816 return snd_pcm_delay(substream, arg);
2817 case SNDRV_PCM_IOCTL_SYNC_PTR:
2818 return snd_pcm_sync_ptr(substream, arg);
2819 #ifdef CONFIG_SND_SUPPORT_OLD_API
2820 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2821 return snd_pcm_hw_refine_old_user(substream, arg);
2822 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2823 return snd_pcm_hw_params_old_user(substream, arg);
2824 #endif
2825 case SNDRV_PCM_IOCTL_DRAIN:
2826 return snd_pcm_drain(substream, file);
2827 case SNDRV_PCM_IOCTL_DROP:
2828 return snd_pcm_drop(substream);
2829 case SNDRV_PCM_IOCTL_PAUSE:
2830 {
2831 int res;
2832 snd_pcm_stream_lock_irq(substream);
2833 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2834 snd_pcm_stream_unlock_irq(substream);
2835 return res;
2836 }
2837 }
2838 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2839 return -ENOTTY;
2840 }
2841
snd_pcm_playback_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2842 static int snd_pcm_playback_ioctl1(struct file *file,
2843 struct snd_pcm_substream *substream,
2844 unsigned int cmd, void __user *arg)
2845 {
2846 if (snd_BUG_ON(!substream))
2847 return -ENXIO;
2848 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2849 return -EINVAL;
2850 switch (cmd) {
2851 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2852 {
2853 struct snd_xferi xferi;
2854 struct snd_xferi __user *_xferi = arg;
2855 struct snd_pcm_runtime *runtime = substream->runtime;
2856 snd_pcm_sframes_t result;
2857 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2858 return -EBADFD;
2859 if (put_user(0, &_xferi->result))
2860 return -EFAULT;
2861 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2862 return -EFAULT;
2863 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2864 __put_user(result, &_xferi->result);
2865 return result < 0 ? result : 0;
2866 }
2867 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2868 {
2869 struct snd_xfern xfern;
2870 struct snd_xfern __user *_xfern = arg;
2871 struct snd_pcm_runtime *runtime = substream->runtime;
2872 void __user **bufs;
2873 snd_pcm_sframes_t result;
2874 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2875 return -EBADFD;
2876 if (runtime->channels > 128)
2877 return -EINVAL;
2878 if (put_user(0, &_xfern->result))
2879 return -EFAULT;
2880 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2881 return -EFAULT;
2882
2883 bufs = memdup_user(xfern.bufs,
2884 sizeof(void *) * runtime->channels);
2885 if (IS_ERR(bufs))
2886 return PTR_ERR(bufs);
2887 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2888 kfree(bufs);
2889 __put_user(result, &_xfern->result);
2890 return result < 0 ? result : 0;
2891 }
2892 case SNDRV_PCM_IOCTL_REWIND:
2893 {
2894 snd_pcm_uframes_t frames;
2895 snd_pcm_uframes_t __user *_frames = arg;
2896 snd_pcm_sframes_t result;
2897 if (get_user(frames, _frames))
2898 return -EFAULT;
2899 if (put_user(0, _frames))
2900 return -EFAULT;
2901 result = snd_pcm_playback_rewind(substream, frames);
2902 __put_user(result, _frames);
2903 return result < 0 ? result : 0;
2904 }
2905 case SNDRV_PCM_IOCTL_FORWARD:
2906 {
2907 snd_pcm_uframes_t frames;
2908 snd_pcm_uframes_t __user *_frames = arg;
2909 snd_pcm_sframes_t result;
2910 if (get_user(frames, _frames))
2911 return -EFAULT;
2912 if (put_user(0, _frames))
2913 return -EFAULT;
2914 result = snd_pcm_playback_forward(substream, frames);
2915 __put_user(result, _frames);
2916 return result < 0 ? result : 0;
2917 }
2918 }
2919 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2920 }
2921
snd_pcm_capture_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2922 static int snd_pcm_capture_ioctl1(struct file *file,
2923 struct snd_pcm_substream *substream,
2924 unsigned int cmd, void __user *arg)
2925 {
2926 if (snd_BUG_ON(!substream))
2927 return -ENXIO;
2928 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2929 return -EINVAL;
2930 switch (cmd) {
2931 case SNDRV_PCM_IOCTL_READI_FRAMES:
2932 {
2933 struct snd_xferi xferi;
2934 struct snd_xferi __user *_xferi = arg;
2935 struct snd_pcm_runtime *runtime = substream->runtime;
2936 snd_pcm_sframes_t result;
2937 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2938 return -EBADFD;
2939 if (put_user(0, &_xferi->result))
2940 return -EFAULT;
2941 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2942 return -EFAULT;
2943 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2944 __put_user(result, &_xferi->result);
2945 return result < 0 ? result : 0;
2946 }
2947 case SNDRV_PCM_IOCTL_READN_FRAMES:
2948 {
2949 struct snd_xfern xfern;
2950 struct snd_xfern __user *_xfern = arg;
2951 struct snd_pcm_runtime *runtime = substream->runtime;
2952 void *bufs;
2953 snd_pcm_sframes_t result;
2954 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2955 return -EBADFD;
2956 if (runtime->channels > 128)
2957 return -EINVAL;
2958 if (put_user(0, &_xfern->result))
2959 return -EFAULT;
2960 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2961 return -EFAULT;
2962
2963 bufs = memdup_user(xfern.bufs,
2964 sizeof(void *) * runtime->channels);
2965 if (IS_ERR(bufs))
2966 return PTR_ERR(bufs);
2967 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2968 kfree(bufs);
2969 __put_user(result, &_xfern->result);
2970 return result < 0 ? result : 0;
2971 }
2972 case SNDRV_PCM_IOCTL_REWIND:
2973 {
2974 snd_pcm_uframes_t frames;
2975 snd_pcm_uframes_t __user *_frames = arg;
2976 snd_pcm_sframes_t result;
2977 if (get_user(frames, _frames))
2978 return -EFAULT;
2979 if (put_user(0, _frames))
2980 return -EFAULT;
2981 result = snd_pcm_capture_rewind(substream, frames);
2982 __put_user(result, _frames);
2983 return result < 0 ? result : 0;
2984 }
2985 case SNDRV_PCM_IOCTL_FORWARD:
2986 {
2987 snd_pcm_uframes_t frames;
2988 snd_pcm_uframes_t __user *_frames = arg;
2989 snd_pcm_sframes_t result;
2990 if (get_user(frames, _frames))
2991 return -EFAULT;
2992 if (put_user(0, _frames))
2993 return -EFAULT;
2994 result = snd_pcm_capture_forward(substream, frames);
2995 __put_user(result, _frames);
2996 return result < 0 ? result : 0;
2997 }
2998 }
2999 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
3000 }
3001
snd_pcm_playback_ioctl(struct file * file,unsigned int cmd,unsigned long arg)3002 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
3003 unsigned long arg)
3004 {
3005 struct snd_pcm_file *pcm_file;
3006
3007 pcm_file = file->private_data;
3008
3009 if (((cmd >> 8) & 0xff) != 'A')
3010 return -ENOTTY;
3011
3012 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
3013 (void __user *)arg);
3014 }
3015
snd_pcm_capture_ioctl(struct file * file,unsigned int cmd,unsigned long arg)3016 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
3017 unsigned long arg)
3018 {
3019 struct snd_pcm_file *pcm_file;
3020
3021 pcm_file = file->private_data;
3022
3023 if (((cmd >> 8) & 0xff) != 'A')
3024 return -ENOTTY;
3025
3026 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
3027 (void __user *)arg);
3028 }
3029
snd_pcm_kernel_ioctl(struct snd_pcm_substream * substream,unsigned int cmd,void * arg)3030 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3031 unsigned int cmd, void *arg)
3032 {
3033 mm_segment_t fs;
3034 int result;
3035
3036 fs = snd_enter_user();
3037 switch (substream->stream) {
3038 case SNDRV_PCM_STREAM_PLAYBACK:
3039 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
3040 (void __user *)arg);
3041 break;
3042 case SNDRV_PCM_STREAM_CAPTURE:
3043 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
3044 (void __user *)arg);
3045 break;
3046 default:
3047 result = -EINVAL;
3048 break;
3049 }
3050 snd_leave_user(fs);
3051 return result;
3052 }
3053
3054 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3055
snd_pcm_read(struct file * file,char __user * buf,size_t count,loff_t * offset)3056 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3057 loff_t * offset)
3058 {
3059 struct snd_pcm_file *pcm_file;
3060 struct snd_pcm_substream *substream;
3061 struct snd_pcm_runtime *runtime;
3062 snd_pcm_sframes_t result;
3063
3064 pcm_file = file->private_data;
3065 substream = pcm_file->substream;
3066 if (PCM_RUNTIME_CHECK(substream))
3067 return -ENXIO;
3068 runtime = substream->runtime;
3069 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3070 return -EBADFD;
3071 if (!frame_aligned(runtime, count))
3072 return -EINVAL;
3073 count = bytes_to_frames(runtime, count);
3074 result = snd_pcm_lib_read(substream, buf, count);
3075 if (result > 0)
3076 result = frames_to_bytes(runtime, result);
3077 return result;
3078 }
3079
snd_pcm_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)3080 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3081 size_t count, loff_t * offset)
3082 {
3083 struct snd_pcm_file *pcm_file;
3084 struct snd_pcm_substream *substream;
3085 struct snd_pcm_runtime *runtime;
3086 snd_pcm_sframes_t result;
3087
3088 pcm_file = file->private_data;
3089 substream = pcm_file->substream;
3090 if (PCM_RUNTIME_CHECK(substream))
3091 return -ENXIO;
3092 runtime = substream->runtime;
3093 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3094 return -EBADFD;
3095 if (!frame_aligned(runtime, count))
3096 return -EINVAL;
3097 count = bytes_to_frames(runtime, count);
3098 result = snd_pcm_lib_write(substream, buf, count);
3099 if (result > 0)
3100 result = frames_to_bytes(runtime, result);
3101 return result;
3102 }
3103
snd_pcm_readv(struct kiocb * iocb,struct iov_iter * to)3104 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3105 {
3106 struct snd_pcm_file *pcm_file;
3107 struct snd_pcm_substream *substream;
3108 struct snd_pcm_runtime *runtime;
3109 snd_pcm_sframes_t result;
3110 unsigned long i;
3111 void __user **bufs;
3112 snd_pcm_uframes_t frames;
3113
3114 pcm_file = iocb->ki_filp->private_data;
3115 substream = pcm_file->substream;
3116 if (PCM_RUNTIME_CHECK(substream))
3117 return -ENXIO;
3118 runtime = substream->runtime;
3119 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3120 return -EBADFD;
3121 if (!iter_is_iovec(to))
3122 return -EINVAL;
3123 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3124 return -EINVAL;
3125 if (!frame_aligned(runtime, to->iov->iov_len))
3126 return -EINVAL;
3127 frames = bytes_to_samples(runtime, to->iov->iov_len);
3128 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3129 if (bufs == NULL)
3130 return -ENOMEM;
3131 for (i = 0; i < to->nr_segs; ++i)
3132 bufs[i] = to->iov[i].iov_base;
3133 result = snd_pcm_lib_readv(substream, bufs, frames);
3134 if (result > 0)
3135 result = frames_to_bytes(runtime, result);
3136 kfree(bufs);
3137 return result;
3138 }
3139
snd_pcm_writev(struct kiocb * iocb,struct iov_iter * from)3140 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3141 {
3142 struct snd_pcm_file *pcm_file;
3143 struct snd_pcm_substream *substream;
3144 struct snd_pcm_runtime *runtime;
3145 snd_pcm_sframes_t result;
3146 unsigned long i;
3147 void __user **bufs;
3148 snd_pcm_uframes_t frames;
3149
3150 pcm_file = iocb->ki_filp->private_data;
3151 substream = pcm_file->substream;
3152 if (PCM_RUNTIME_CHECK(substream))
3153 return -ENXIO;
3154 runtime = substream->runtime;
3155 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3156 return -EBADFD;
3157 if (!iter_is_iovec(from))
3158 return -EINVAL;
3159 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3160 !frame_aligned(runtime, from->iov->iov_len))
3161 return -EINVAL;
3162 frames = bytes_to_samples(runtime, from->iov->iov_len);
3163 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3164 if (bufs == NULL)
3165 return -ENOMEM;
3166 for (i = 0; i < from->nr_segs; ++i)
3167 bufs[i] = from->iov[i].iov_base;
3168 result = snd_pcm_lib_writev(substream, bufs, frames);
3169 if (result > 0)
3170 result = frames_to_bytes(runtime, result);
3171 kfree(bufs);
3172 return result;
3173 }
3174
snd_pcm_playback_poll(struct file * file,poll_table * wait)3175 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3176 {
3177 struct snd_pcm_file *pcm_file;
3178 struct snd_pcm_substream *substream;
3179 struct snd_pcm_runtime *runtime;
3180 unsigned int mask;
3181 snd_pcm_uframes_t avail;
3182
3183 pcm_file = file->private_data;
3184
3185 substream = pcm_file->substream;
3186 if (PCM_RUNTIME_CHECK(substream))
3187 return -ENXIO;
3188 runtime = substream->runtime;
3189
3190 poll_wait(file, &runtime->sleep, wait);
3191
3192 snd_pcm_stream_lock_irq(substream);
3193 avail = snd_pcm_playback_avail(runtime);
3194 switch (runtime->status->state) {
3195 case SNDRV_PCM_STATE_RUNNING:
3196 case SNDRV_PCM_STATE_PREPARED:
3197 case SNDRV_PCM_STATE_PAUSED:
3198 if (avail >= runtime->control->avail_min) {
3199 mask = POLLOUT | POLLWRNORM;
3200 break;
3201 }
3202 /* Fall through */
3203 case SNDRV_PCM_STATE_DRAINING:
3204 mask = 0;
3205 break;
3206 default:
3207 mask = POLLOUT | POLLWRNORM | POLLERR;
3208 break;
3209 }
3210 snd_pcm_stream_unlock_irq(substream);
3211 return mask;
3212 }
3213
snd_pcm_capture_poll(struct file * file,poll_table * wait)3214 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3215 {
3216 struct snd_pcm_file *pcm_file;
3217 struct snd_pcm_substream *substream;
3218 struct snd_pcm_runtime *runtime;
3219 unsigned int mask;
3220 snd_pcm_uframes_t avail;
3221
3222 pcm_file = file->private_data;
3223
3224 substream = pcm_file->substream;
3225 if (PCM_RUNTIME_CHECK(substream))
3226 return -ENXIO;
3227 runtime = substream->runtime;
3228
3229 poll_wait(file, &runtime->sleep, wait);
3230
3231 snd_pcm_stream_lock_irq(substream);
3232 avail = snd_pcm_capture_avail(runtime);
3233 switch (runtime->status->state) {
3234 case SNDRV_PCM_STATE_RUNNING:
3235 case SNDRV_PCM_STATE_PREPARED:
3236 case SNDRV_PCM_STATE_PAUSED:
3237 if (avail >= runtime->control->avail_min) {
3238 mask = POLLIN | POLLRDNORM;
3239 break;
3240 }
3241 mask = 0;
3242 break;
3243 case SNDRV_PCM_STATE_DRAINING:
3244 if (avail > 0) {
3245 mask = POLLIN | POLLRDNORM;
3246 break;
3247 }
3248 /* Fall through */
3249 default:
3250 mask = POLLIN | POLLRDNORM | POLLERR;
3251 break;
3252 }
3253 snd_pcm_stream_unlock_irq(substream);
3254 return mask;
3255 }
3256
3257 /*
3258 * mmap support
3259 */
3260
3261 /*
3262 * Only on coherent architectures, we can mmap the status and the control records
3263 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3264 */
3265 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3266 /*
3267 * mmap status record
3268 */
snd_pcm_mmap_status_fault(struct vm_area_struct * area,struct vm_fault * vmf)3269 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3270 struct vm_fault *vmf)
3271 {
3272 struct snd_pcm_substream *substream = area->vm_private_data;
3273 struct snd_pcm_runtime *runtime;
3274
3275 if (substream == NULL)
3276 return VM_FAULT_SIGBUS;
3277 runtime = substream->runtime;
3278 vmf->page = virt_to_page(runtime->status);
3279 get_page(vmf->page);
3280 return 0;
3281 }
3282
3283 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3284 {
3285 .fault = snd_pcm_mmap_status_fault,
3286 };
3287
snd_pcm_mmap_status(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3288 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3289 struct vm_area_struct *area)
3290 {
3291 long size;
3292 if (!(area->vm_flags & VM_READ))
3293 return -EINVAL;
3294 size = area->vm_end - area->vm_start;
3295 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3296 return -EINVAL;
3297 area->vm_ops = &snd_pcm_vm_ops_status;
3298 area->vm_private_data = substream;
3299 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3300 return 0;
3301 }
3302
3303 /*
3304 * mmap control record
3305 */
snd_pcm_mmap_control_fault(struct vm_area_struct * area,struct vm_fault * vmf)3306 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3307 struct vm_fault *vmf)
3308 {
3309 struct snd_pcm_substream *substream = area->vm_private_data;
3310 struct snd_pcm_runtime *runtime;
3311
3312 if (substream == NULL)
3313 return VM_FAULT_SIGBUS;
3314 runtime = substream->runtime;
3315 vmf->page = virt_to_page(runtime->control);
3316 get_page(vmf->page);
3317 return 0;
3318 }
3319
3320 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3321 {
3322 .fault = snd_pcm_mmap_control_fault,
3323 };
3324
snd_pcm_mmap_control(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3325 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3326 struct vm_area_struct *area)
3327 {
3328 long size;
3329 if (!(area->vm_flags & VM_READ))
3330 return -EINVAL;
3331 size = area->vm_end - area->vm_start;
3332 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3333 return -EINVAL;
3334 area->vm_ops = &snd_pcm_vm_ops_control;
3335 area->vm_private_data = substream;
3336 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3337 return 0;
3338 }
3339 #else /* ! coherent mmap */
3340 /*
3341 * don't support mmap for status and control records.
3342 */
snd_pcm_mmap_status(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3343 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3344 struct vm_area_struct *area)
3345 {
3346 return -ENXIO;
3347 }
snd_pcm_mmap_control(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3348 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3349 struct vm_area_struct *area)
3350 {
3351 return -ENXIO;
3352 }
3353 #endif /* coherent mmap */
3354
3355 static inline struct page *
snd_pcm_default_page_ops(struct snd_pcm_substream * substream,unsigned long ofs)3356 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3357 {
3358 void *vaddr = substream->runtime->dma_area + ofs;
3359 return virt_to_page(vaddr);
3360 }
3361
3362 /*
3363 * fault callback for mmapping a RAM page
3364 */
snd_pcm_mmap_data_fault(struct vm_area_struct * area,struct vm_fault * vmf)3365 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3366 struct vm_fault *vmf)
3367 {
3368 struct snd_pcm_substream *substream = area->vm_private_data;
3369 struct snd_pcm_runtime *runtime;
3370 unsigned long offset;
3371 struct page * page;
3372 size_t dma_bytes;
3373
3374 if (substream == NULL)
3375 return VM_FAULT_SIGBUS;
3376 runtime = substream->runtime;
3377 offset = vmf->pgoff << PAGE_SHIFT;
3378 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3379 if (offset > dma_bytes - PAGE_SIZE)
3380 return VM_FAULT_SIGBUS;
3381 if (substream->ops->page)
3382 page = substream->ops->page(substream, offset);
3383 else
3384 page = snd_pcm_default_page_ops(substream, offset);
3385 if (!page)
3386 return VM_FAULT_SIGBUS;
3387 get_page(page);
3388 vmf->page = page;
3389 return 0;
3390 }
3391
3392 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3393 .open = snd_pcm_mmap_data_open,
3394 .close = snd_pcm_mmap_data_close,
3395 };
3396
3397 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3398 .open = snd_pcm_mmap_data_open,
3399 .close = snd_pcm_mmap_data_close,
3400 .fault = snd_pcm_mmap_data_fault,
3401 };
3402
3403 /*
3404 * mmap the DMA buffer on RAM
3405 */
3406
3407 /**
3408 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3409 * @substream: PCM substream
3410 * @area: VMA
3411 *
3412 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3413 * this function is invoked implicitly.
3414 */
snd_pcm_lib_default_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * area)3415 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3416 struct vm_area_struct *area)
3417 {
3418 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3419 #ifdef CONFIG_GENERIC_ALLOCATOR
3420 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3421 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3422 return remap_pfn_range(area, area->vm_start,
3423 substream->dma_buffer.addr >> PAGE_SHIFT,
3424 area->vm_end - area->vm_start, area->vm_page_prot);
3425 }
3426 #endif /* CONFIG_GENERIC_ALLOCATOR */
3427 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3428 if (!substream->ops->page &&
3429 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3430 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3431 area,
3432 substream->runtime->dma_area,
3433 substream->runtime->dma_addr,
3434 substream->runtime->dma_bytes);
3435 #endif /* CONFIG_X86 */
3436 /* mmap with fault handler */
3437 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3438 return 0;
3439 }
3440 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3441
3442 /*
3443 * mmap the DMA buffer on I/O memory area
3444 */
3445 #if SNDRV_PCM_INFO_MMAP_IOMEM
3446 /**
3447 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3448 * @substream: PCM substream
3449 * @area: VMA
3450 *
3451 * When your hardware uses the iomapped pages as the hardware buffer and
3452 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3453 * is supposed to work only on limited architectures.
3454 */
snd_pcm_lib_mmap_iomem(struct snd_pcm_substream * substream,struct vm_area_struct * area)3455 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3456 struct vm_area_struct *area)
3457 {
3458 struct snd_pcm_runtime *runtime = substream->runtime;;
3459
3460 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3461 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3462 }
3463
3464 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3465 #endif /* SNDRV_PCM_INFO_MMAP */
3466
3467 /*
3468 * mmap DMA buffer
3469 */
snd_pcm_mmap_data(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3470 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3471 struct vm_area_struct *area)
3472 {
3473 struct snd_pcm_runtime *runtime;
3474 long size;
3475 unsigned long offset;
3476 size_t dma_bytes;
3477 int err;
3478
3479 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3480 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3481 return -EINVAL;
3482 } else {
3483 if (!(area->vm_flags & VM_READ))
3484 return -EINVAL;
3485 }
3486 runtime = substream->runtime;
3487 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3488 return -EBADFD;
3489 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3490 return -ENXIO;
3491 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3492 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3493 return -EINVAL;
3494 size = area->vm_end - area->vm_start;
3495 offset = area->vm_pgoff << PAGE_SHIFT;
3496 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3497 if ((size_t)size > dma_bytes)
3498 return -EINVAL;
3499 if (offset > dma_bytes - size)
3500 return -EINVAL;
3501
3502 area->vm_ops = &snd_pcm_vm_ops_data;
3503 area->vm_private_data = substream;
3504 if (substream->ops->mmap)
3505 err = substream->ops->mmap(substream, area);
3506 else
3507 err = snd_pcm_lib_default_mmap(substream, area);
3508 if (!err)
3509 atomic_inc(&substream->mmap_count);
3510 return err;
3511 }
3512
3513 EXPORT_SYMBOL(snd_pcm_mmap_data);
3514
snd_pcm_mmap(struct file * file,struct vm_area_struct * area)3515 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3516 {
3517 struct snd_pcm_file * pcm_file;
3518 struct snd_pcm_substream *substream;
3519 unsigned long offset;
3520
3521 pcm_file = file->private_data;
3522 substream = pcm_file->substream;
3523 if (PCM_RUNTIME_CHECK(substream))
3524 return -ENXIO;
3525
3526 offset = area->vm_pgoff << PAGE_SHIFT;
3527 switch (offset) {
3528 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3529 if (pcm_file->no_compat_mmap)
3530 return -ENXIO;
3531 return snd_pcm_mmap_status(substream, file, area);
3532 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3533 if (pcm_file->no_compat_mmap)
3534 return -ENXIO;
3535 return snd_pcm_mmap_control(substream, file, area);
3536 default:
3537 return snd_pcm_mmap_data(substream, file, area);
3538 }
3539 return 0;
3540 }
3541
snd_pcm_fasync(int fd,struct file * file,int on)3542 static int snd_pcm_fasync(int fd, struct file * file, int on)
3543 {
3544 struct snd_pcm_file * pcm_file;
3545 struct snd_pcm_substream *substream;
3546 struct snd_pcm_runtime *runtime;
3547
3548 pcm_file = file->private_data;
3549 substream = pcm_file->substream;
3550 if (PCM_RUNTIME_CHECK(substream))
3551 return -ENXIO;
3552 runtime = substream->runtime;
3553 return fasync_helper(fd, file, on, &runtime->fasync);
3554 }
3555
3556 /*
3557 * ioctl32 compat
3558 */
3559 #ifdef CONFIG_COMPAT
3560 #include "pcm_compat.c"
3561 #else
3562 #define snd_pcm_ioctl_compat NULL
3563 #endif
3564
3565 /*
3566 * To be removed helpers to keep binary compatibility
3567 */
3568
3569 #ifdef CONFIG_SND_SUPPORT_OLD_API
3570 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3571 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3572
snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params * params,struct snd_pcm_hw_params_old * oparams)3573 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3574 struct snd_pcm_hw_params_old *oparams)
3575 {
3576 unsigned int i;
3577
3578 memset(params, 0, sizeof(*params));
3579 params->flags = oparams->flags;
3580 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3581 params->masks[i].bits[0] = oparams->masks[i];
3582 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3583 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3584 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3585 params->info = oparams->info;
3586 params->msbits = oparams->msbits;
3587 params->rate_num = oparams->rate_num;
3588 params->rate_den = oparams->rate_den;
3589 params->fifo_size = oparams->fifo_size;
3590 }
3591
snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old * oparams,struct snd_pcm_hw_params * params)3592 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3593 struct snd_pcm_hw_params *params)
3594 {
3595 unsigned int i;
3596
3597 memset(oparams, 0, sizeof(*oparams));
3598 oparams->flags = params->flags;
3599 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3600 oparams->masks[i] = params->masks[i].bits[0];
3601 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3602 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3603 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3604 oparams->info = params->info;
3605 oparams->msbits = params->msbits;
3606 oparams->rate_num = params->rate_num;
3607 oparams->rate_den = params->rate_den;
3608 oparams->fifo_size = params->fifo_size;
3609 }
3610
snd_pcm_hw_refine_old_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params_old __user * _oparams)3611 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3612 struct snd_pcm_hw_params_old __user * _oparams)
3613 {
3614 struct snd_pcm_hw_params *params;
3615 struct snd_pcm_hw_params_old *oparams = NULL;
3616 int err;
3617
3618 params = kmalloc(sizeof(*params), GFP_KERNEL);
3619 if (!params)
3620 return -ENOMEM;
3621
3622 oparams = memdup_user(_oparams, sizeof(*oparams));
3623 if (IS_ERR(oparams)) {
3624 err = PTR_ERR(oparams);
3625 goto out;
3626 }
3627 snd_pcm_hw_convert_from_old_params(params, oparams);
3628 err = snd_pcm_hw_refine(substream, params);
3629 snd_pcm_hw_convert_to_old_params(oparams, params);
3630 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3631 if (!err)
3632 err = -EFAULT;
3633 }
3634
3635 kfree(oparams);
3636 out:
3637 kfree(params);
3638 return err;
3639 }
3640
snd_pcm_hw_params_old_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params_old __user * _oparams)3641 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3642 struct snd_pcm_hw_params_old __user * _oparams)
3643 {
3644 struct snd_pcm_hw_params *params;
3645 struct snd_pcm_hw_params_old *oparams = NULL;
3646 int err;
3647
3648 params = kmalloc(sizeof(*params), GFP_KERNEL);
3649 if (!params)
3650 return -ENOMEM;
3651
3652 oparams = memdup_user(_oparams, sizeof(*oparams));
3653 if (IS_ERR(oparams)) {
3654 err = PTR_ERR(oparams);
3655 goto out;
3656 }
3657 snd_pcm_hw_convert_from_old_params(params, oparams);
3658 err = snd_pcm_hw_params(substream, params);
3659 snd_pcm_hw_convert_to_old_params(oparams, params);
3660 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3661 if (!err)
3662 err = -EFAULT;
3663 }
3664
3665 kfree(oparams);
3666 out:
3667 kfree(params);
3668 return err;
3669 }
3670 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3671
3672 #ifndef CONFIG_MMU
snd_pcm_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)3673 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3674 unsigned long addr,
3675 unsigned long len,
3676 unsigned long pgoff,
3677 unsigned long flags)
3678 {
3679 struct snd_pcm_file *pcm_file = file->private_data;
3680 struct snd_pcm_substream *substream = pcm_file->substream;
3681 struct snd_pcm_runtime *runtime = substream->runtime;
3682 unsigned long offset = pgoff << PAGE_SHIFT;
3683
3684 switch (offset) {
3685 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3686 return (unsigned long)runtime->status;
3687 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3688 return (unsigned long)runtime->control;
3689 default:
3690 return (unsigned long)runtime->dma_area + offset;
3691 }
3692 }
3693 #else
3694 # define snd_pcm_get_unmapped_area NULL
3695 #endif
3696
3697 /*
3698 * Register section
3699 */
3700
3701 const struct file_operations snd_pcm_f_ops[2] = {
3702 {
3703 .owner = THIS_MODULE,
3704 .write = snd_pcm_write,
3705 .write_iter = snd_pcm_writev,
3706 .open = snd_pcm_playback_open,
3707 .release = snd_pcm_release,
3708 .llseek = no_llseek,
3709 .poll = snd_pcm_playback_poll,
3710 .unlocked_ioctl = snd_pcm_playback_ioctl,
3711 .compat_ioctl = snd_pcm_ioctl_compat,
3712 .mmap = snd_pcm_mmap,
3713 .fasync = snd_pcm_fasync,
3714 .get_unmapped_area = snd_pcm_get_unmapped_area,
3715 },
3716 {
3717 .owner = THIS_MODULE,
3718 .read = snd_pcm_read,
3719 .read_iter = snd_pcm_readv,
3720 .open = snd_pcm_capture_open,
3721 .release = snd_pcm_release,
3722 .llseek = no_llseek,
3723 .poll = snd_pcm_capture_poll,
3724 .unlocked_ioctl = snd_pcm_capture_ioctl,
3725 .compat_ioctl = snd_pcm_ioctl_compat,
3726 .mmap = snd_pcm_mmap,
3727 .fasync = snd_pcm_fasync,
3728 .get_unmapped_area = snd_pcm_get_unmapped_area,
3729 }
3730 };
3731