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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/mm.h>
8#include <linux/module.h>
9#include <linux/file.h>
10#include <linux/slab.h>
11#include <linux/sched/signal.h>
12#include <linux/time.h>
13#include <linux/pm_qos.h>
14#include <linux/io.h>
15#include <linux/dma-mapping.h>
16#include <sound/core.h>
17#include <sound/control.h>
18#include <sound/info.h>
19#include <sound/pcm.h>
20#include <sound/pcm_params.h>
21#include <sound/timer.h>
22#include <sound/minors.h>
23#include <linux/uio.h>
24#include <linux/delay.h>
25
26#include "pcm_local.h"
27
28#ifdef CONFIG_SND_DEBUG
29#define CREATE_TRACE_POINTS
30#include "pcm_param_trace.h"
31#else
32#define trace_hw_mask_param_enabled() 0
33#define trace_hw_interval_param_enabled() 0
34#define trace_hw_mask_param(substream, type, index, prev, curr)
35#define trace_hw_interval_param(substream, type, index, prev, curr)
36#endif
37
38/*
39 * Compatibility
40 */
41
42struct snd_pcm_hw_params_old {
43 unsigned int flags;
44 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
45 SNDRV_PCM_HW_PARAM_ACCESS + 1];
46 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
47 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
48 unsigned int rmask;
49 unsigned int cmask;
50 unsigned int info;
51 unsigned int msbits;
52 unsigned int rate_num;
53 unsigned int rate_den;
54 snd_pcm_uframes_t fifo_size;
55 unsigned char reserved[64];
56};
57
58#ifdef CONFIG_SND_SUPPORT_OLD_API
59#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
60#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
61
62static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
63 struct snd_pcm_hw_params_old __user * _oparams);
64static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66#endif
67static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
68
69/*
70 *
71 */
72
73static DECLARE_RWSEM(snd_pcm_link_rwsem);
74
75void snd_pcm_group_init(struct snd_pcm_group *group)
76{
77 spin_lock_init(&group->lock);
78 mutex_init(&group->mutex);
79 INIT_LIST_HEAD(&group->substreams);
80 refcount_set(&group->refs, 1);
81}
82
83/* define group lock helpers */
84#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
85static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
86{ \
87 if (nonatomic) \
88 mutex_ ## mutex_action(&group->mutex); \
89 else \
90 spin_ ## action(&group->lock); \
91}
92
93DEFINE_PCM_GROUP_LOCK(lock, lock);
94DEFINE_PCM_GROUP_LOCK(unlock, unlock);
95DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
96DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
97
98/**
99 * snd_pcm_stream_lock - Lock the PCM stream
100 * @substream: PCM substream
101 *
102 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
103 * flag of the given substream. This also takes the global link rw lock
104 * (or rw sem), too, for avoiding the race with linked streams.
105 */
106void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
107{
108 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
109}
110EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
111
112/**
113 * snd_pcm_stream_lock - Unlock the PCM stream
114 * @substream: PCM substream
115 *
116 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
117 */
118void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
119{
120 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
121}
122EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
123
124/**
125 * snd_pcm_stream_lock_irq - Lock the PCM stream
126 * @substream: PCM substream
127 *
128 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
129 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
130 * as snd_pcm_stream_lock().
131 */
132void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
133{
134 snd_pcm_group_lock_irq(&substream->self_group,
135 substream->pcm->nonatomic);
136}
137EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
138
139/**
140 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
141 * @substream: PCM substream
142 *
143 * This is a counter-part of snd_pcm_stream_lock_irq().
144 */
145void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
146{
147 snd_pcm_group_unlock_irq(&substream->self_group,
148 substream->pcm->nonatomic);
149}
150EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
151
152unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
153{
154 unsigned long flags = 0;
155 if (substream->pcm->nonatomic)
156 mutex_lock(&substream->self_group.mutex);
157 else
158 spin_lock_irqsave(&substream->self_group.lock, flags);
159 return flags;
160}
161EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
162
163/**
164 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
165 * @substream: PCM substream
166 * @flags: irq flags
167 *
168 * This is a counter-part of snd_pcm_stream_lock_irqsave().
169 */
170void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
171 unsigned long flags)
172{
173 if (substream->pcm->nonatomic)
174 mutex_unlock(&substream->self_group.mutex);
175 else
176 spin_unlock_irqrestore(&substream->self_group.lock, flags);
177}
178EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
179
180int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
181{
182 struct snd_pcm *pcm = substream->pcm;
183 struct snd_pcm_str *pstr = substream->pstr;
184
185 memset(info, 0, sizeof(*info));
186 info->card = pcm->card->number;
187 info->device = pcm->device;
188 info->stream = substream->stream;
189 info->subdevice = substream->number;
190 strlcpy(info->id, pcm->id, sizeof(info->id));
191 strlcpy(info->name, pcm->name, sizeof(info->name));
192 info->dev_class = pcm->dev_class;
193 info->dev_subclass = pcm->dev_subclass;
194 info->subdevices_count = pstr->substream_count;
195 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
196 strlcpy(info->subname, substream->name, sizeof(info->subname));
197
198 return 0;
199}
200
201int snd_pcm_info_user(struct snd_pcm_substream *substream,
202 struct snd_pcm_info __user * _info)
203{
204 struct snd_pcm_info *info;
205 int err;
206
207 info = kmalloc(sizeof(*info), GFP_KERNEL);
208 if (! info)
209 return -ENOMEM;
210 err = snd_pcm_info(substream, info);
211 if (err >= 0) {
212 if (copy_to_user(_info, info, sizeof(*info)))
213 err = -EFAULT;
214 }
215 kfree(info);
216 return err;
217}
218
219static bool hw_support_mmap(struct snd_pcm_substream *substream)
220{
221 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
222 return false;
223
224 if (substream->ops->mmap ||
225 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV)
226 return true;
227
228 return dma_can_mmap(substream->dma_buffer.dev.dev);
229}
230
231static int constrain_mask_params(struct snd_pcm_substream *substream,
232 struct snd_pcm_hw_params *params)
233{
234 struct snd_pcm_hw_constraints *constrs =
235 &substream->runtime->hw_constraints;
236 struct snd_mask *m;
237 unsigned int k;
238 struct snd_mask old_mask;
239 int changed;
240
241 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
242 m = hw_param_mask(params, k);
243 if (snd_mask_empty(m))
244 return -EINVAL;
245
246 /* This parameter is not requested to change by a caller. */
247 if (!(params->rmask & (1 << k)))
248 continue;
249
250 if (trace_hw_mask_param_enabled())
251 old_mask = *m;
252
253 changed = snd_mask_refine(m, constrs_mask(constrs, k));
254 if (changed < 0)
255 return changed;
256 if (changed == 0)
257 continue;
258
259 /* Set corresponding flag so that the caller gets it. */
260 trace_hw_mask_param(substream, k, 0, &old_mask, m);
261 params->cmask |= 1 << k;
262 }
263
264 return 0;
265}
266
267static int constrain_interval_params(struct snd_pcm_substream *substream,
268 struct snd_pcm_hw_params *params)
269{
270 struct snd_pcm_hw_constraints *constrs =
271 &substream->runtime->hw_constraints;
272 struct snd_interval *i;
273 unsigned int k;
274 struct snd_interval old_interval;
275 int changed;
276
277 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
278 i = hw_param_interval(params, k);
279 if (snd_interval_empty(i))
280 return -EINVAL;
281
282 /* This parameter is not requested to change by a caller. */
283 if (!(params->rmask & (1 << k)))
284 continue;
285
286 if (trace_hw_interval_param_enabled())
287 old_interval = *i;
288
289 changed = snd_interval_refine(i, constrs_interval(constrs, k));
290 if (changed < 0)
291 return changed;
292 if (changed == 0)
293 continue;
294
295 /* Set corresponding flag so that the caller gets it. */
296 trace_hw_interval_param(substream, k, 0, &old_interval, i);
297 params->cmask |= 1 << k;
298 }
299
300 return 0;
301}
302
303static int constrain_params_by_rules(struct snd_pcm_substream *substream,
304 struct snd_pcm_hw_params *params)
305{
306 struct snd_pcm_hw_constraints *constrs =
307 &substream->runtime->hw_constraints;
308 unsigned int k;
309 unsigned int *rstamps;
310 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
311 unsigned int stamp;
312 struct snd_pcm_hw_rule *r;
313 unsigned int d;
314 struct snd_mask old_mask;
315 struct snd_interval old_interval;
316 bool again;
317 int changed, err = 0;
318
319 /*
320 * Each application of rule has own sequence number.
321 *
322 * Each member of 'rstamps' array represents the sequence number of
323 * recent application of corresponding rule.
324 */
325 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
326 if (!rstamps)
327 return -ENOMEM;
328
329 /*
330 * Each member of 'vstamps' array represents the sequence number of
331 * recent application of rule in which corresponding parameters were
332 * changed.
333 *
334 * In initial state, elements corresponding to parameters requested by
335 * a caller is 1. For unrequested parameters, corresponding members
336 * have 0 so that the parameters are never changed anymore.
337 */
338 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
339 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
340
341 /* Due to the above design, actual sequence number starts at 2. */
342 stamp = 2;
343retry:
344 /* Apply all rules in order. */
345 again = false;
346 for (k = 0; k < constrs->rules_num; k++) {
347 r = &constrs->rules[k];
348
349 /*
350 * Check condition bits of this rule. When the rule has
351 * some condition bits, parameter without the bits is
352 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
353 * is an example of the condition bits.
354 */
355 if (r->cond && !(r->cond & params->flags))
356 continue;
357
358 /*
359 * The 'deps' array includes maximum three dependencies
360 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
361 * member of this array is a sentinel and should be
362 * negative value.
363 *
364 * This rule should be processed in this time when dependent
365 * parameters were changed at former applications of the other
366 * rules.
367 */
368 for (d = 0; r->deps[d] >= 0; d++) {
369 if (vstamps[r->deps[d]] > rstamps[k])
370 break;
371 }
372 if (r->deps[d] < 0)
373 continue;
374
375 if (trace_hw_mask_param_enabled()) {
376 if (hw_is_mask(r->var))
377 old_mask = *hw_param_mask(params, r->var);
378 }
379 if (trace_hw_interval_param_enabled()) {
380 if (hw_is_interval(r->var))
381 old_interval = *hw_param_interval(params, r->var);
382 }
383
384 changed = r->func(params, r);
385 if (changed < 0) {
386 err = changed;
387 goto out;
388 }
389
390 /*
391 * When the parameter is changed, notify it to the caller
392 * by corresponding returned bit, then preparing for next
393 * iteration.
394 */
395 if (changed && r->var >= 0) {
396 if (hw_is_mask(r->var)) {
397 trace_hw_mask_param(substream, r->var,
398 k + 1, &old_mask,
399 hw_param_mask(params, r->var));
400 }
401 if (hw_is_interval(r->var)) {
402 trace_hw_interval_param(substream, r->var,
403 k + 1, &old_interval,
404 hw_param_interval(params, r->var));
405 }
406
407 params->cmask |= (1 << r->var);
408 vstamps[r->var] = stamp;
409 again = true;
410 }
411
412 rstamps[k] = stamp++;
413 }
414
415 /* Iterate to evaluate all rules till no parameters are changed. */
416 if (again)
417 goto retry;
418
419 out:
420 kfree(rstamps);
421 return err;
422}
423
424static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
425 struct snd_pcm_hw_params *params)
426{
427 const struct snd_interval *i;
428 const struct snd_mask *m;
429 int err;
430
431 if (!params->msbits) {
432 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
433 if (snd_interval_single(i))
434 params->msbits = snd_interval_value(i);
435 }
436
437 if (!params->rate_den) {
438 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
439 if (snd_interval_single(i)) {
440 params->rate_num = snd_interval_value(i);
441 params->rate_den = 1;
442 }
443 }
444
445 if (!params->fifo_size) {
446 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
447 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
448 if (snd_mask_single(m) && snd_interval_single(i)) {
449 err = substream->ops->ioctl(substream,
450 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
451 if (err < 0)
452 return err;
453 }
454 }
455
456 if (!params->info) {
457 params->info = substream->runtime->hw.info;
458 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
459 SNDRV_PCM_INFO_DRAIN_TRIGGER);
460 if (!hw_support_mmap(substream))
461 params->info &= ~(SNDRV_PCM_INFO_MMAP |
462 SNDRV_PCM_INFO_MMAP_VALID);
463 }
464
465 return 0;
466}
467
468int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
469 struct snd_pcm_hw_params *params)
470{
471 int err;
472
473 params->info = 0;
474 params->fifo_size = 0;
475 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
476 params->msbits = 0;
477 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
478 params->rate_num = 0;
479 params->rate_den = 0;
480 }
481
482 err = constrain_mask_params(substream, params);
483 if (err < 0)
484 return err;
485
486 err = constrain_interval_params(substream, params);
487 if (err < 0)
488 return err;
489
490 err = constrain_params_by_rules(substream, params);
491 if (err < 0)
492 return err;
493
494 params->rmask = 0;
495
496 return 0;
497}
498EXPORT_SYMBOL(snd_pcm_hw_refine);
499
500static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
501 struct snd_pcm_hw_params __user * _params)
502{
503 struct snd_pcm_hw_params *params;
504 int err;
505
506 params = memdup_user(_params, sizeof(*params));
507 if (IS_ERR(params))
508 return PTR_ERR(params);
509
510 err = snd_pcm_hw_refine(substream, params);
511 if (err < 0)
512 goto end;
513
514 err = fixup_unreferenced_params(substream, params);
515 if (err < 0)
516 goto end;
517
518 if (copy_to_user(_params, params, sizeof(*params)))
519 err = -EFAULT;
520end:
521 kfree(params);
522 return err;
523}
524
525static int period_to_usecs(struct snd_pcm_runtime *runtime)
526{
527 int usecs;
528
529 if (! runtime->rate)
530 return -1; /* invalid */
531
532 /* take 75% of period time as the deadline */
533 usecs = (750000 / runtime->rate) * runtime->period_size;
534 usecs += ((750000 % runtime->rate) * runtime->period_size) /
535 runtime->rate;
536
537 return usecs;
538}
539
540static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
541{
542 snd_pcm_stream_lock_irq(substream);
543 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
544 substream->runtime->status->state = state;
545 snd_pcm_stream_unlock_irq(substream);
546}
547
548static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
549 int event)
550{
551#ifdef CONFIG_SND_PCM_TIMER
552 if (substream->timer)
553 snd_timer_notify(substream->timer, event,
554 &substream->runtime->trigger_tstamp);
555#endif
556}
557
558/**
559 * snd_pcm_hw_param_choose - choose a configuration defined by @params
560 * @pcm: PCM instance
561 * @params: the hw_params instance
562 *
563 * Choose one configuration from configuration space defined by @params.
564 * The configuration chosen is that obtained fixing in this order:
565 * first access, first format, first subformat, min channels,
566 * min rate, min period time, max buffer size, min tick time
567 *
568 * Return: Zero if successful, or a negative error code on failure.
569 */
570static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
571 struct snd_pcm_hw_params *params)
572{
573 static const int vars[] = {
574 SNDRV_PCM_HW_PARAM_ACCESS,
575 SNDRV_PCM_HW_PARAM_FORMAT,
576 SNDRV_PCM_HW_PARAM_SUBFORMAT,
577 SNDRV_PCM_HW_PARAM_CHANNELS,
578 SNDRV_PCM_HW_PARAM_RATE,
579 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
580 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
581 SNDRV_PCM_HW_PARAM_TICK_TIME,
582 -1
583 };
584 const int *v;
585 struct snd_mask old_mask;
586 struct snd_interval old_interval;
587 int changed;
588
589 for (v = vars; *v != -1; v++) {
590 /* Keep old parameter to trace. */
591 if (trace_hw_mask_param_enabled()) {
592 if (hw_is_mask(*v))
593 old_mask = *hw_param_mask(params, *v);
594 }
595 if (trace_hw_interval_param_enabled()) {
596 if (hw_is_interval(*v))
597 old_interval = *hw_param_interval(params, *v);
598 }
599 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
600 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
601 else
602 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
603 if (changed < 0)
604 return changed;
605 if (changed == 0)
606 continue;
607
608 /* Trace the changed parameter. */
609 if (hw_is_mask(*v)) {
610 trace_hw_mask_param(pcm, *v, 0, &old_mask,
611 hw_param_mask(params, *v));
612 }
613 if (hw_is_interval(*v)) {
614 trace_hw_interval_param(pcm, *v, 0, &old_interval,
615 hw_param_interval(params, *v));
616 }
617 }
618
619 return 0;
620}
621
622static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
623 struct snd_pcm_hw_params *params)
624{
625 struct snd_pcm_runtime *runtime;
626 int err, usecs;
627 unsigned int bits;
628 snd_pcm_uframes_t frames;
629
630 if (PCM_RUNTIME_CHECK(substream))
631 return -ENXIO;
632 runtime = substream->runtime;
633 snd_pcm_stream_lock_irq(substream);
634 switch (runtime->status->state) {
635 case SNDRV_PCM_STATE_OPEN:
636 case SNDRV_PCM_STATE_SETUP:
637 case SNDRV_PCM_STATE_PREPARED:
638 break;
639 default:
640 snd_pcm_stream_unlock_irq(substream);
641 return -EBADFD;
642 }
643 snd_pcm_stream_unlock_irq(substream);
644#if IS_ENABLED(CONFIG_SND_PCM_OSS)
645 if (!substream->oss.oss)
646#endif
647 if (atomic_read(&substream->mmap_count))
648 return -EBADFD;
649
650 params->rmask = ~0U;
651 err = snd_pcm_hw_refine(substream, params);
652 if (err < 0)
653 goto _error;
654
655 err = snd_pcm_hw_params_choose(substream, params);
656 if (err < 0)
657 goto _error;
658
659 err = fixup_unreferenced_params(substream, params);
660 if (err < 0)
661 goto _error;
662
663 if (substream->ops->hw_params != NULL) {
664 err = substream->ops->hw_params(substream, params);
665 if (err < 0)
666 goto _error;
667 }
668
669 runtime->access = params_access(params);
670 runtime->format = params_format(params);
671 runtime->subformat = params_subformat(params);
672 runtime->channels = params_channels(params);
673 runtime->rate = params_rate(params);
674 runtime->period_size = params_period_size(params);
675 runtime->periods = params_periods(params);
676 runtime->buffer_size = params_buffer_size(params);
677 runtime->info = params->info;
678 runtime->rate_num = params->rate_num;
679 runtime->rate_den = params->rate_den;
680 runtime->no_period_wakeup =
681 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
682 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
683
684 bits = snd_pcm_format_physical_width(runtime->format);
685 runtime->sample_bits = bits;
686 bits *= runtime->channels;
687 runtime->frame_bits = bits;
688 frames = 1;
689 while (bits % 8 != 0) {
690 bits *= 2;
691 frames *= 2;
692 }
693 runtime->byte_align = bits / 8;
694 runtime->min_align = frames;
695
696 /* Default sw params */
697 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
698 runtime->period_step = 1;
699 runtime->control->avail_min = runtime->period_size;
700 runtime->start_threshold = 1;
701 runtime->stop_threshold = runtime->buffer_size;
702 runtime->silence_threshold = 0;
703 runtime->silence_size = 0;
704 runtime->boundary = runtime->buffer_size;
705 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
706 runtime->boundary *= 2;
707
708 snd_pcm_timer_resolution_change(substream);
709 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
710
711 if (pm_qos_request_active(&substream->latency_pm_qos_req))
712 pm_qos_remove_request(&substream->latency_pm_qos_req);
713 if ((usecs = period_to_usecs(runtime)) >= 0)
714 pm_qos_add_request(&substream->latency_pm_qos_req,
715 PM_QOS_CPU_DMA_LATENCY, usecs);
716 return 0;
717 _error:
718 /* hardware might be unusable from this time,
719 so we force application to retry to set
720 the correct hardware parameter settings */
721 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
722 if (substream->ops->hw_free != NULL)
723 substream->ops->hw_free(substream);
724 return err;
725}
726
727static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
728 struct snd_pcm_hw_params __user * _params)
729{
730 struct snd_pcm_hw_params *params;
731 int err;
732
733 params = memdup_user(_params, sizeof(*params));
734 if (IS_ERR(params))
735 return PTR_ERR(params);
736
737 err = snd_pcm_hw_params(substream, params);
738 if (err < 0)
739 goto end;
740
741 if (copy_to_user(_params, params, sizeof(*params)))
742 err = -EFAULT;
743end:
744 kfree(params);
745 return err;
746}
747
748static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
749{
750 struct snd_pcm_runtime *runtime;
751 int result = 0;
752
753 if (PCM_RUNTIME_CHECK(substream))
754 return -ENXIO;
755 runtime = substream->runtime;
756 snd_pcm_stream_lock_irq(substream);
757 switch (runtime->status->state) {
758 case SNDRV_PCM_STATE_SETUP:
759 case SNDRV_PCM_STATE_PREPARED:
760 break;
761 default:
762 snd_pcm_stream_unlock_irq(substream);
763 return -EBADFD;
764 }
765 snd_pcm_stream_unlock_irq(substream);
766 if (atomic_read(&substream->mmap_count))
767 return -EBADFD;
768 if (substream->ops->hw_free)
769 result = substream->ops->hw_free(substream);
770 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
771 pm_qos_remove_request(&substream->latency_pm_qos_req);
772 return result;
773}
774
775static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
776 struct snd_pcm_sw_params *params)
777{
778 struct snd_pcm_runtime *runtime;
779 int err;
780
781 if (PCM_RUNTIME_CHECK(substream))
782 return -ENXIO;
783 runtime = substream->runtime;
784 snd_pcm_stream_lock_irq(substream);
785 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
786 snd_pcm_stream_unlock_irq(substream);
787 return -EBADFD;
788 }
789 snd_pcm_stream_unlock_irq(substream);
790
791 if (params->tstamp_mode < 0 ||
792 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
793 return -EINVAL;
794 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
795 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
796 return -EINVAL;
797 if (params->avail_min == 0)
798 return -EINVAL;
799 if (params->silence_size >= runtime->boundary) {
800 if (params->silence_threshold != 0)
801 return -EINVAL;
802 } else {
803 if (params->silence_size > params->silence_threshold)
804 return -EINVAL;
805 if (params->silence_threshold > runtime->buffer_size)
806 return -EINVAL;
807 }
808 err = 0;
809 snd_pcm_stream_lock_irq(substream);
810 runtime->tstamp_mode = params->tstamp_mode;
811 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
812 runtime->tstamp_type = params->tstamp_type;
813 runtime->period_step = params->period_step;
814 runtime->control->avail_min = params->avail_min;
815 runtime->start_threshold = params->start_threshold;
816 runtime->stop_threshold = params->stop_threshold;
817 runtime->silence_threshold = params->silence_threshold;
818 runtime->silence_size = params->silence_size;
819 params->boundary = runtime->boundary;
820 if (snd_pcm_running(substream)) {
821 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
822 runtime->silence_size > 0)
823 snd_pcm_playback_silence(substream, ULONG_MAX);
824 err = snd_pcm_update_state(substream, runtime);
825 }
826 snd_pcm_stream_unlock_irq(substream);
827 return err;
828}
829
830static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
831 struct snd_pcm_sw_params __user * _params)
832{
833 struct snd_pcm_sw_params params;
834 int err;
835 if (copy_from_user(¶ms, _params, sizeof(params)))
836 return -EFAULT;
837 err = snd_pcm_sw_params(substream, ¶ms);
838 if (copy_to_user(_params, ¶ms, sizeof(params)))
839 return -EFAULT;
840 return err;
841}
842
843static inline snd_pcm_uframes_t
844snd_pcm_calc_delay(struct snd_pcm_substream *substream)
845{
846 snd_pcm_uframes_t delay;
847
848 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
849 delay = snd_pcm_playback_hw_avail(substream->runtime);
850 else
851 delay = snd_pcm_capture_avail(substream->runtime);
852 return delay + substream->runtime->delay;
853}
854
855int snd_pcm_status(struct snd_pcm_substream *substream,
856 struct snd_pcm_status *status)
857{
858 struct snd_pcm_runtime *runtime = substream->runtime;
859
860 snd_pcm_stream_lock_irq(substream);
861
862 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
863 &runtime->audio_tstamp_config);
864
865 /* backwards compatible behavior */
866 if (runtime->audio_tstamp_config.type_requested ==
867 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
868 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
869 runtime->audio_tstamp_config.type_requested =
870 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
871 else
872 runtime->audio_tstamp_config.type_requested =
873 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
874 runtime->audio_tstamp_report.valid = 0;
875 } else
876 runtime->audio_tstamp_report.valid = 1;
877
878 status->state = runtime->status->state;
879 status->suspended_state = runtime->status->suspended_state;
880 if (status->state == SNDRV_PCM_STATE_OPEN)
881 goto _end;
882 status->trigger_tstamp = runtime->trigger_tstamp;
883 if (snd_pcm_running(substream)) {
884 snd_pcm_update_hw_ptr(substream);
885 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
886 status->tstamp = runtime->status->tstamp;
887 status->driver_tstamp = runtime->driver_tstamp;
888 status->audio_tstamp =
889 runtime->status->audio_tstamp;
890 if (runtime->audio_tstamp_report.valid == 1)
891 /* backwards compatibility, no report provided in COMPAT mode */
892 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
893 &status->audio_tstamp_accuracy,
894 &runtime->audio_tstamp_report);
895
896 goto _tstamp_end;
897 }
898 } else {
899 /* get tstamp only in fallback mode and only if enabled */
900 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
901 snd_pcm_gettime(runtime, &status->tstamp);
902 }
903 _tstamp_end:
904 status->appl_ptr = runtime->control->appl_ptr;
905 status->hw_ptr = runtime->status->hw_ptr;
906 status->avail = snd_pcm_avail(substream);
907 status->delay = snd_pcm_running(substream) ?
908 snd_pcm_calc_delay(substream) : 0;
909 status->avail_max = runtime->avail_max;
910 status->overrange = runtime->overrange;
911 runtime->avail_max = 0;
912 runtime->overrange = 0;
913 _end:
914 snd_pcm_stream_unlock_irq(substream);
915 return 0;
916}
917
918static int snd_pcm_status_user(struct snd_pcm_substream *substream,
919 struct snd_pcm_status __user * _status,
920 bool ext)
921{
922 struct snd_pcm_status status;
923 int res;
924
925 memset(&status, 0, sizeof(status));
926 /*
927 * with extension, parameters are read/write,
928 * get audio_tstamp_data from user,
929 * ignore rest of status structure
930 */
931 if (ext && get_user(status.audio_tstamp_data,
932 (u32 __user *)(&_status->audio_tstamp_data)))
933 return -EFAULT;
934 res = snd_pcm_status(substream, &status);
935 if (res < 0)
936 return res;
937 if (copy_to_user(_status, &status, sizeof(status)))
938 return -EFAULT;
939 return 0;
940}
941
942static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
943 struct snd_pcm_channel_info * info)
944{
945 struct snd_pcm_runtime *runtime;
946 unsigned int channel;
947
948 channel = info->channel;
949 runtime = substream->runtime;
950 snd_pcm_stream_lock_irq(substream);
951 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
952 snd_pcm_stream_unlock_irq(substream);
953 return -EBADFD;
954 }
955 snd_pcm_stream_unlock_irq(substream);
956 if (channel >= runtime->channels)
957 return -EINVAL;
958 memset(info, 0, sizeof(*info));
959 info->channel = channel;
960 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
961}
962
963static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
964 struct snd_pcm_channel_info __user * _info)
965{
966 struct snd_pcm_channel_info info;
967 int res;
968
969 if (copy_from_user(&info, _info, sizeof(info)))
970 return -EFAULT;
971 res = snd_pcm_channel_info(substream, &info);
972 if (res < 0)
973 return res;
974 if (copy_to_user(_info, &info, sizeof(info)))
975 return -EFAULT;
976 return 0;
977}
978
979static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
980{
981 struct snd_pcm_runtime *runtime = substream->runtime;
982 if (runtime->trigger_master == NULL)
983 return;
984 if (runtime->trigger_master == substream) {
985 if (!runtime->trigger_tstamp_latched)
986 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
987 } else {
988 snd_pcm_trigger_tstamp(runtime->trigger_master);
989 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
990 }
991 runtime->trigger_master = NULL;
992}
993
994struct action_ops {
995 int (*pre_action)(struct snd_pcm_substream *substream, int state);
996 int (*do_action)(struct snd_pcm_substream *substream, int state);
997 void (*undo_action)(struct snd_pcm_substream *substream, int state);
998 void (*post_action)(struct snd_pcm_substream *substream, int state);
999};
1000
1001/*
1002 * this functions is core for handling of linked stream
1003 * Note: the stream state might be changed also on failure
1004 * Note2: call with calling stream lock + link lock
1005 */
1006static int snd_pcm_action_group(const struct action_ops *ops,
1007 struct snd_pcm_substream *substream,
1008 int state, int do_lock)
1009{
1010 struct snd_pcm_substream *s = NULL;
1011 struct snd_pcm_substream *s1;
1012 int res = 0, depth = 1;
1013
1014 snd_pcm_group_for_each_entry(s, substream) {
1015 if (do_lock && s != substream) {
1016 if (s->pcm->nonatomic)
1017 mutex_lock_nested(&s->self_group.mutex, depth);
1018 else
1019 spin_lock_nested(&s->self_group.lock, depth);
1020 depth++;
1021 }
1022 res = ops->pre_action(s, state);
1023 if (res < 0)
1024 goto _unlock;
1025 }
1026 snd_pcm_group_for_each_entry(s, substream) {
1027 res = ops->do_action(s, state);
1028 if (res < 0) {
1029 if (ops->undo_action) {
1030 snd_pcm_group_for_each_entry(s1, substream) {
1031 if (s1 == s) /* failed stream */
1032 break;
1033 ops->undo_action(s1, state);
1034 }
1035 }
1036 s = NULL; /* unlock all */
1037 goto _unlock;
1038 }
1039 }
1040 snd_pcm_group_for_each_entry(s, substream) {
1041 ops->post_action(s, state);
1042 }
1043 _unlock:
1044 if (do_lock) {
1045 /* unlock streams */
1046 snd_pcm_group_for_each_entry(s1, substream) {
1047 if (s1 != substream) {
1048 if (s1->pcm->nonatomic)
1049 mutex_unlock(&s1->self_group.mutex);
1050 else
1051 spin_unlock(&s1->self_group.lock);
1052 }
1053 if (s1 == s) /* end */
1054 break;
1055 }
1056 }
1057 return res;
1058}
1059
1060/*
1061 * Note: call with stream lock
1062 */
1063static int snd_pcm_action_single(const struct action_ops *ops,
1064 struct snd_pcm_substream *substream,
1065 int state)
1066{
1067 int res;
1068
1069 res = ops->pre_action(substream, state);
1070 if (res < 0)
1071 return res;
1072 res = ops->do_action(substream, state);
1073 if (res == 0)
1074 ops->post_action(substream, state);
1075 else if (ops->undo_action)
1076 ops->undo_action(substream, state);
1077 return res;
1078}
1079
1080static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1081 struct snd_pcm_group *new_group)
1082{
1083 substream->group = new_group;
1084 list_move(&substream->link_list, &new_group->substreams);
1085}
1086
1087/*
1088 * Unref and unlock the group, but keep the stream lock;
1089 * when the group becomes empty and no longer referred, destroy itself
1090 */
1091static void snd_pcm_group_unref(struct snd_pcm_group *group,
1092 struct snd_pcm_substream *substream)
1093{
1094 bool do_free;
1095
1096 if (!group)
1097 return;
1098 do_free = refcount_dec_and_test(&group->refs);
1099 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1100 if (do_free)
1101 kfree(group);
1102}
1103
1104/*
1105 * Lock the group inside a stream lock and reference it;
1106 * return the locked group object, or NULL if not linked
1107 */
1108static struct snd_pcm_group *
1109snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1110{
1111 bool nonatomic = substream->pcm->nonatomic;
1112 struct snd_pcm_group *group;
1113 bool trylock;
1114
1115 for (;;) {
1116 if (!snd_pcm_stream_linked(substream))
1117 return NULL;
1118 group = substream->group;
1119 /* block freeing the group object */
1120 refcount_inc(&group->refs);
1121
1122 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1123 spin_trylock(&group->lock);
1124 if (trylock)
1125 break; /* OK */
1126
1127 /* re-lock for avoiding ABBA deadlock */
1128 snd_pcm_stream_unlock(substream);
1129 snd_pcm_group_lock(group, nonatomic);
1130 snd_pcm_stream_lock(substream);
1131
1132 /* check the group again; the above opens a small race window */
1133 if (substream->group == group)
1134 break; /* OK */
1135 /* group changed, try again */
1136 snd_pcm_group_unref(group, substream);
1137 }
1138 return group;
1139}
1140
1141/*
1142 * Note: call with stream lock
1143 */
1144static int snd_pcm_action(const struct action_ops *ops,
1145 struct snd_pcm_substream *substream,
1146 int state)
1147{
1148 struct snd_pcm_group *group;
1149 int res;
1150
1151 group = snd_pcm_stream_group_ref(substream);
1152 if (group)
1153 res = snd_pcm_action_group(ops, substream, state, 1);
1154 else
1155 res = snd_pcm_action_single(ops, substream, state);
1156 snd_pcm_group_unref(group, substream);
1157 return res;
1158}
1159
1160/*
1161 * Note: don't use any locks before
1162 */
1163static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1164 struct snd_pcm_substream *substream,
1165 int state)
1166{
1167 int res;
1168
1169 snd_pcm_stream_lock_irq(substream);
1170 res = snd_pcm_action(ops, substream, state);
1171 snd_pcm_stream_unlock_irq(substream);
1172 return res;
1173}
1174
1175/*
1176 */
1177static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1178 struct snd_pcm_substream *substream,
1179 int state)
1180{
1181 int res;
1182
1183 /* Guarantee the group members won't change during non-atomic action */
1184 down_read(&snd_pcm_link_rwsem);
1185 if (snd_pcm_stream_linked(substream))
1186 res = snd_pcm_action_group(ops, substream, state, 0);
1187 else
1188 res = snd_pcm_action_single(ops, substream, state);
1189 up_read(&snd_pcm_link_rwsem);
1190 return res;
1191}
1192
1193/*
1194 * start callbacks
1195 */
1196static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1197{
1198 struct snd_pcm_runtime *runtime = substream->runtime;
1199 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1200 return -EBADFD;
1201 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1202 !snd_pcm_playback_data(substream))
1203 return -EPIPE;
1204 runtime->trigger_tstamp_latched = false;
1205 runtime->trigger_master = substream;
1206 return 0;
1207}
1208
1209static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1210{
1211 if (substream->runtime->trigger_master != substream)
1212 return 0;
1213 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1214}
1215
1216static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1217{
1218 if (substream->runtime->trigger_master == substream)
1219 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1220}
1221
1222static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1223{
1224 struct snd_pcm_runtime *runtime = substream->runtime;
1225 snd_pcm_trigger_tstamp(substream);
1226 runtime->hw_ptr_jiffies = jiffies;
1227 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1228 runtime->rate;
1229 runtime->status->state = state;
1230 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1231 runtime->silence_size > 0)
1232 snd_pcm_playback_silence(substream, ULONG_MAX);
1233 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1234}
1235
1236static const struct action_ops snd_pcm_action_start = {
1237 .pre_action = snd_pcm_pre_start,
1238 .do_action = snd_pcm_do_start,
1239 .undo_action = snd_pcm_undo_start,
1240 .post_action = snd_pcm_post_start
1241};
1242
1243/**
1244 * snd_pcm_start - start all linked streams
1245 * @substream: the PCM substream instance
1246 *
1247 * Return: Zero if successful, or a negative error code.
1248 * The stream lock must be acquired before calling this function.
1249 */
1250int snd_pcm_start(struct snd_pcm_substream *substream)
1251{
1252 return snd_pcm_action(&snd_pcm_action_start, substream,
1253 SNDRV_PCM_STATE_RUNNING);
1254}
1255
1256/* take the stream lock and start the streams */
1257static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1258{
1259 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1260 SNDRV_PCM_STATE_RUNNING);
1261}
1262
1263/*
1264 * stop callbacks
1265 */
1266static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1267{
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1270 return -EBADFD;
1271 runtime->trigger_master = substream;
1272 return 0;
1273}
1274
1275static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1276{
1277 if (substream->runtime->trigger_master == substream &&
1278 snd_pcm_running(substream))
1279 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1280 return 0; /* unconditonally stop all substreams */
1281}
1282
1283static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1284{
1285 struct snd_pcm_runtime *runtime = substream->runtime;
1286 if (runtime->status->state != state) {
1287 snd_pcm_trigger_tstamp(substream);
1288 runtime->status->state = state;
1289 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1290 }
1291 wake_up(&runtime->sleep);
1292 wake_up(&runtime->tsleep);
1293}
1294
1295static const struct action_ops snd_pcm_action_stop = {
1296 .pre_action = snd_pcm_pre_stop,
1297 .do_action = snd_pcm_do_stop,
1298 .post_action = snd_pcm_post_stop
1299};
1300
1301/**
1302 * snd_pcm_stop - try to stop all running streams in the substream group
1303 * @substream: the PCM substream instance
1304 * @state: PCM state after stopping the stream
1305 *
1306 * The state of each stream is then changed to the given state unconditionally.
1307 *
1308 * Return: Zero if successful, or a negative error code.
1309 */
1310int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1311{
1312 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1313}
1314EXPORT_SYMBOL(snd_pcm_stop);
1315
1316/**
1317 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1318 * @substream: the PCM substream
1319 *
1320 * After stopping, the state is changed to SETUP.
1321 * Unlike snd_pcm_stop(), this affects only the given stream.
1322 *
1323 * Return: Zero if succesful, or a negative error code.
1324 */
1325int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1326{
1327 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1328 SNDRV_PCM_STATE_SETUP);
1329}
1330
1331/**
1332 * snd_pcm_stop_xrun - stop the running streams as XRUN
1333 * @substream: the PCM substream instance
1334 *
1335 * This stops the given running substream (and all linked substreams) as XRUN.
1336 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1337 *
1338 * Return: Zero if successful, or a negative error code.
1339 */
1340int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1341{
1342 unsigned long flags;
1343
1344 snd_pcm_stream_lock_irqsave(substream, flags);
1345 if (substream->runtime && snd_pcm_running(substream))
1346 __snd_pcm_xrun(substream);
1347 snd_pcm_stream_unlock_irqrestore(substream, flags);
1348 return 0;
1349}
1350EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1351
1352/*
1353 * pause callbacks
1354 */
1355static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1356{
1357 struct snd_pcm_runtime *runtime = substream->runtime;
1358 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1359 return -ENOSYS;
1360 if (push) {
1361 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1362 return -EBADFD;
1363 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1364 return -EBADFD;
1365 runtime->trigger_master = substream;
1366 return 0;
1367}
1368
1369static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1370{
1371 if (substream->runtime->trigger_master != substream)
1372 return 0;
1373 /* some drivers might use hw_ptr to recover from the pause -
1374 update the hw_ptr now */
1375 if (push)
1376 snd_pcm_update_hw_ptr(substream);
1377 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1378 * a delta between the current jiffies, this gives a large enough
1379 * delta, effectively to skip the check once.
1380 */
1381 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1382 return substream->ops->trigger(substream,
1383 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1384 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1385}
1386
1387static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1388{
1389 if (substream->runtime->trigger_master == substream)
1390 substream->ops->trigger(substream,
1391 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1392 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1393}
1394
1395static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1396{
1397 struct snd_pcm_runtime *runtime = substream->runtime;
1398 snd_pcm_trigger_tstamp(substream);
1399 if (push) {
1400 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1401 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1402 wake_up(&runtime->sleep);
1403 wake_up(&runtime->tsleep);
1404 } else {
1405 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1406 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1407 }
1408}
1409
1410static const struct action_ops snd_pcm_action_pause = {
1411 .pre_action = snd_pcm_pre_pause,
1412 .do_action = snd_pcm_do_pause,
1413 .undo_action = snd_pcm_undo_pause,
1414 .post_action = snd_pcm_post_pause
1415};
1416
1417/*
1418 * Push/release the pause for all linked streams.
1419 */
1420static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1421{
1422 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1423}
1424
1425#ifdef CONFIG_PM
1426/* suspend */
1427
1428static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1429{
1430 struct snd_pcm_runtime *runtime = substream->runtime;
1431 switch (runtime->status->state) {
1432 case SNDRV_PCM_STATE_SUSPENDED:
1433 return -EBUSY;
1434 /* unresumable PCM state; return -EBUSY for skipping suspend */
1435 case SNDRV_PCM_STATE_OPEN:
1436 case SNDRV_PCM_STATE_SETUP:
1437 case SNDRV_PCM_STATE_DISCONNECTED:
1438 return -EBUSY;
1439 }
1440 runtime->trigger_master = substream;
1441 return 0;
1442}
1443
1444static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1445{
1446 struct snd_pcm_runtime *runtime = substream->runtime;
1447 if (runtime->trigger_master != substream)
1448 return 0;
1449 if (! snd_pcm_running(substream))
1450 return 0;
1451 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1452 return 0; /* suspend unconditionally */
1453}
1454
1455static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1456{
1457 struct snd_pcm_runtime *runtime = substream->runtime;
1458 snd_pcm_trigger_tstamp(substream);
1459 runtime->status->suspended_state = runtime->status->state;
1460 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1461 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1462 wake_up(&runtime->sleep);
1463 wake_up(&runtime->tsleep);
1464}
1465
1466static const struct action_ops snd_pcm_action_suspend = {
1467 .pre_action = snd_pcm_pre_suspend,
1468 .do_action = snd_pcm_do_suspend,
1469 .post_action = snd_pcm_post_suspend
1470};
1471
1472/*
1473 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1474 * @substream: the PCM substream
1475 *
1476 * After this call, all streams are changed to SUSPENDED state.
1477 *
1478 * Return: Zero if successful, or a negative error code.
1479 */
1480static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1481{
1482 int err;
1483 unsigned long flags;
1484
1485 snd_pcm_stream_lock_irqsave(substream, flags);
1486 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1487 snd_pcm_stream_unlock_irqrestore(substream, flags);
1488 return err;
1489}
1490
1491/**
1492 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1493 * @pcm: the PCM instance
1494 *
1495 * After this call, all streams are changed to SUSPENDED state.
1496 *
1497 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1498 */
1499int snd_pcm_suspend_all(struct snd_pcm *pcm)
1500{
1501 struct snd_pcm_substream *substream;
1502 int stream, err = 0;
1503
1504 if (! pcm)
1505 return 0;
1506
1507 for (stream = 0; stream < 2; stream++) {
1508 for (substream = pcm->streams[stream].substream;
1509 substream; substream = substream->next) {
1510 /* FIXME: the open/close code should lock this as well */
1511 if (substream->runtime == NULL)
1512 continue;
1513
1514 /*
1515 * Skip BE dai link PCM's that are internal and may
1516 * not have their substream ops set.
1517 */
1518 if (!substream->ops)
1519 continue;
1520
1521 err = snd_pcm_suspend(substream);
1522 if (err < 0 && err != -EBUSY)
1523 return err;
1524 }
1525 }
1526 return 0;
1527}
1528EXPORT_SYMBOL(snd_pcm_suspend_all);
1529
1530/* resume */
1531
1532static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1533{
1534 struct snd_pcm_runtime *runtime = substream->runtime;
1535 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1536 return -ENOSYS;
1537 runtime->trigger_master = substream;
1538 return 0;
1539}
1540
1541static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1542{
1543 struct snd_pcm_runtime *runtime = substream->runtime;
1544 if (runtime->trigger_master != substream)
1545 return 0;
1546 /* DMA not running previously? */
1547 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1548 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1549 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1550 return 0;
1551 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1552}
1553
1554static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1555{
1556 if (substream->runtime->trigger_master == substream &&
1557 snd_pcm_running(substream))
1558 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1559}
1560
1561static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1562{
1563 struct snd_pcm_runtime *runtime = substream->runtime;
1564 snd_pcm_trigger_tstamp(substream);
1565 runtime->status->state = runtime->status->suspended_state;
1566 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1567}
1568
1569static const struct action_ops snd_pcm_action_resume = {
1570 .pre_action = snd_pcm_pre_resume,
1571 .do_action = snd_pcm_do_resume,
1572 .undo_action = snd_pcm_undo_resume,
1573 .post_action = snd_pcm_post_resume
1574};
1575
1576static int snd_pcm_resume(struct snd_pcm_substream *substream)
1577{
1578 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1579}
1580
1581#else
1582
1583static int snd_pcm_resume(struct snd_pcm_substream *substream)
1584{
1585 return -ENOSYS;
1586}
1587
1588#endif /* CONFIG_PM */
1589
1590/*
1591 * xrun ioctl
1592 *
1593 * Change the RUNNING stream(s) to XRUN state.
1594 */
1595static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1596{
1597 struct snd_pcm_runtime *runtime = substream->runtime;
1598 int result;
1599
1600 snd_pcm_stream_lock_irq(substream);
1601 switch (runtime->status->state) {
1602 case SNDRV_PCM_STATE_XRUN:
1603 result = 0; /* already there */
1604 break;
1605 case SNDRV_PCM_STATE_RUNNING:
1606 __snd_pcm_xrun(substream);
1607 result = 0;
1608 break;
1609 default:
1610 result = -EBADFD;
1611 }
1612 snd_pcm_stream_unlock_irq(substream);
1613 return result;
1614}
1615
1616/*
1617 * reset ioctl
1618 */
1619static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1620{
1621 struct snd_pcm_runtime *runtime = substream->runtime;
1622 switch (runtime->status->state) {
1623 case SNDRV_PCM_STATE_RUNNING:
1624 case SNDRV_PCM_STATE_PREPARED:
1625 case SNDRV_PCM_STATE_PAUSED:
1626 case SNDRV_PCM_STATE_SUSPENDED:
1627 return 0;
1628 default:
1629 return -EBADFD;
1630 }
1631}
1632
1633static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1634{
1635 struct snd_pcm_runtime *runtime = substream->runtime;
1636 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1637 if (err < 0)
1638 return err;
1639 runtime->hw_ptr_base = 0;
1640 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1641 runtime->status->hw_ptr % runtime->period_size;
1642 runtime->silence_start = runtime->status->hw_ptr;
1643 runtime->silence_filled = 0;
1644 return 0;
1645}
1646
1647static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1648{
1649 struct snd_pcm_runtime *runtime = substream->runtime;
1650 runtime->control->appl_ptr = runtime->status->hw_ptr;
1651 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1652 runtime->silence_size > 0)
1653 snd_pcm_playback_silence(substream, ULONG_MAX);
1654}
1655
1656static const struct action_ops snd_pcm_action_reset = {
1657 .pre_action = snd_pcm_pre_reset,
1658 .do_action = snd_pcm_do_reset,
1659 .post_action = snd_pcm_post_reset
1660};
1661
1662static int snd_pcm_reset(struct snd_pcm_substream *substream)
1663{
1664 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1665}
1666
1667/*
1668 * prepare ioctl
1669 */
1670/* we use the second argument for updating f_flags */
1671static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1672 int f_flags)
1673{
1674 struct snd_pcm_runtime *runtime = substream->runtime;
1675 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1676 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1677 return -EBADFD;
1678 if (snd_pcm_running(substream))
1679 return -EBUSY;
1680 substream->f_flags = f_flags;
1681 return 0;
1682}
1683
1684static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1685{
1686 int err;
1687 err = substream->ops->prepare(substream);
1688 if (err < 0)
1689 return err;
1690 return snd_pcm_do_reset(substream, 0);
1691}
1692
1693static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1694{
1695 struct snd_pcm_runtime *runtime = substream->runtime;
1696 runtime->control->appl_ptr = runtime->status->hw_ptr;
1697 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1698}
1699
1700static const struct action_ops snd_pcm_action_prepare = {
1701 .pre_action = snd_pcm_pre_prepare,
1702 .do_action = snd_pcm_do_prepare,
1703 .post_action = snd_pcm_post_prepare
1704};
1705
1706/**
1707 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1708 * @substream: the PCM substream instance
1709 * @file: file to refer f_flags
1710 *
1711 * Return: Zero if successful, or a negative error code.
1712 */
1713static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1714 struct file *file)
1715{
1716 int f_flags;
1717
1718 if (file)
1719 f_flags = file->f_flags;
1720 else
1721 f_flags = substream->f_flags;
1722
1723 snd_pcm_stream_lock_irq(substream);
1724 switch (substream->runtime->status->state) {
1725 case SNDRV_PCM_STATE_PAUSED:
1726 snd_pcm_pause(substream, 0);
1727 /* fallthru */
1728 case SNDRV_PCM_STATE_SUSPENDED:
1729 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1730 break;
1731 }
1732 snd_pcm_stream_unlock_irq(substream);
1733
1734 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1735 substream, f_flags);
1736}
1737
1738/*
1739 * drain ioctl
1740 */
1741
1742static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1743{
1744 struct snd_pcm_runtime *runtime = substream->runtime;
1745 switch (runtime->status->state) {
1746 case SNDRV_PCM_STATE_OPEN:
1747 case SNDRV_PCM_STATE_DISCONNECTED:
1748 case SNDRV_PCM_STATE_SUSPENDED:
1749 return -EBADFD;
1750 }
1751 runtime->trigger_master = substream;
1752 return 0;
1753}
1754
1755static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1756{
1757 struct snd_pcm_runtime *runtime = substream->runtime;
1758 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1759 switch (runtime->status->state) {
1760 case SNDRV_PCM_STATE_PREPARED:
1761 /* start playback stream if possible */
1762 if (! snd_pcm_playback_empty(substream)) {
1763 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1764 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1765 } else {
1766 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1767 }
1768 break;
1769 case SNDRV_PCM_STATE_RUNNING:
1770 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1771 break;
1772 case SNDRV_PCM_STATE_XRUN:
1773 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1774 break;
1775 default:
1776 break;
1777 }
1778 } else {
1779 /* stop running stream */
1780 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1781 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1782 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1783 snd_pcm_do_stop(substream, new_state);
1784 snd_pcm_post_stop(substream, new_state);
1785 }
1786 }
1787
1788 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1789 runtime->trigger_master == substream &&
1790 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1791 return substream->ops->trigger(substream,
1792 SNDRV_PCM_TRIGGER_DRAIN);
1793
1794 return 0;
1795}
1796
1797static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1798{
1799}
1800
1801static const struct action_ops snd_pcm_action_drain_init = {
1802 .pre_action = snd_pcm_pre_drain_init,
1803 .do_action = snd_pcm_do_drain_init,
1804 .post_action = snd_pcm_post_drain_init
1805};
1806
1807/*
1808 * Drain the stream(s).
1809 * When the substream is linked, sync until the draining of all playback streams
1810 * is finished.
1811 * After this call, all streams are supposed to be either SETUP or DRAINING
1812 * (capture only) state.
1813 */
1814static int snd_pcm_drain(struct snd_pcm_substream *substream,
1815 struct file *file)
1816{
1817 struct snd_card *card;
1818 struct snd_pcm_runtime *runtime;
1819 struct snd_pcm_substream *s;
1820 struct snd_pcm_group *group;
1821 wait_queue_entry_t wait;
1822 int result = 0;
1823 int nonblock = 0;
1824
1825 card = substream->pcm->card;
1826 runtime = substream->runtime;
1827
1828 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1829 return -EBADFD;
1830
1831 if (file) {
1832 if (file->f_flags & O_NONBLOCK)
1833 nonblock = 1;
1834 } else if (substream->f_flags & O_NONBLOCK)
1835 nonblock = 1;
1836
1837 snd_pcm_stream_lock_irq(substream);
1838 /* resume pause */
1839 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1840 snd_pcm_pause(substream, 0);
1841
1842 /* pre-start/stop - all running streams are changed to DRAINING state */
1843 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1844 if (result < 0)
1845 goto unlock;
1846 /* in non-blocking, we don't wait in ioctl but let caller poll */
1847 if (nonblock) {
1848 result = -EAGAIN;
1849 goto unlock;
1850 }
1851
1852 for (;;) {
1853 long tout;
1854 struct snd_pcm_runtime *to_check;
1855 if (signal_pending(current)) {
1856 result = -ERESTARTSYS;
1857 break;
1858 }
1859 /* find a substream to drain */
1860 to_check = NULL;
1861 group = snd_pcm_stream_group_ref(substream);
1862 snd_pcm_group_for_each_entry(s, substream) {
1863 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1864 continue;
1865 runtime = s->runtime;
1866 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1867 to_check = runtime;
1868 break;
1869 }
1870 }
1871 snd_pcm_group_unref(group, substream);
1872 if (!to_check)
1873 break; /* all drained */
1874 init_waitqueue_entry(&wait, current);
1875 set_current_state(TASK_INTERRUPTIBLE);
1876 add_wait_queue(&to_check->sleep, &wait);
1877 snd_pcm_stream_unlock_irq(substream);
1878 if (runtime->no_period_wakeup)
1879 tout = MAX_SCHEDULE_TIMEOUT;
1880 else {
1881 tout = 10;
1882 if (runtime->rate) {
1883 long t = runtime->period_size * 2 / runtime->rate;
1884 tout = max(t, tout);
1885 }
1886 tout = msecs_to_jiffies(tout * 1000);
1887 }
1888 tout = schedule_timeout(tout);
1889
1890 snd_pcm_stream_lock_irq(substream);
1891 group = snd_pcm_stream_group_ref(substream);
1892 snd_pcm_group_for_each_entry(s, substream) {
1893 if (s->runtime == to_check) {
1894 remove_wait_queue(&to_check->sleep, &wait);
1895 break;
1896 }
1897 }
1898 snd_pcm_group_unref(group, substream);
1899
1900 if (card->shutdown) {
1901 result = -ENODEV;
1902 break;
1903 }
1904 if (tout == 0) {
1905 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1906 result = -ESTRPIPE;
1907 else {
1908 dev_dbg(substream->pcm->card->dev,
1909 "playback drain error (DMA or IRQ trouble?)\n");
1910 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1911 result = -EIO;
1912 }
1913 break;
1914 }
1915 }
1916
1917 unlock:
1918 snd_pcm_stream_unlock_irq(substream);
1919
1920 return result;
1921}
1922
1923/*
1924 * drop ioctl
1925 *
1926 * Immediately put all linked substreams into SETUP state.
1927 */
1928static int snd_pcm_drop(struct snd_pcm_substream *substream)
1929{
1930 struct snd_pcm_runtime *runtime;
1931 int result = 0;
1932
1933 if (PCM_RUNTIME_CHECK(substream))
1934 return -ENXIO;
1935 runtime = substream->runtime;
1936
1937 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1938 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1939 return -EBADFD;
1940
1941 snd_pcm_stream_lock_irq(substream);
1942 /* resume pause */
1943 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1944 snd_pcm_pause(substream, 0);
1945
1946 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1947 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1948 snd_pcm_stream_unlock_irq(substream);
1949
1950 return result;
1951}
1952
1953
1954static bool is_pcm_file(struct file *file)
1955{
1956 struct inode *inode = file_inode(file);
1957 struct snd_pcm *pcm;
1958 unsigned int minor;
1959
1960 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1961 return false;
1962 minor = iminor(inode);
1963 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
1964 if (!pcm)
1965 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1966 if (!pcm)
1967 return false;
1968 snd_card_unref(pcm->card);
1969 return true;
1970}
1971
1972/*
1973 * PCM link handling
1974 */
1975static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1976{
1977 int res = 0;
1978 struct snd_pcm_file *pcm_file;
1979 struct snd_pcm_substream *substream1;
1980 struct snd_pcm_group *group, *target_group;
1981 bool nonatomic = substream->pcm->nonatomic;
1982 struct fd f = fdget(fd);
1983
1984 if (!f.file)
1985 return -EBADFD;
1986 if (!is_pcm_file(f.file)) {
1987 res = -EBADFD;
1988 goto _badf;
1989 }
1990 pcm_file = f.file->private_data;
1991 substream1 = pcm_file->substream;
1992 group = kzalloc(sizeof(*group), GFP_KERNEL);
1993 if (!group) {
1994 res = -ENOMEM;
1995 goto _nolock;
1996 }
1997 snd_pcm_group_init(group);
1998
1999 down_write(&snd_pcm_link_rwsem);
2000 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2001 substream->runtime->status->state != substream1->runtime->status->state ||
2002 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2003 res = -EBADFD;
2004 goto _end;
2005 }
2006 if (snd_pcm_stream_linked(substream1)) {
2007 res = -EALREADY;
2008 goto _end;
2009 }
2010
2011 snd_pcm_stream_lock_irq(substream);
2012 if (!snd_pcm_stream_linked(substream)) {
2013 snd_pcm_group_assign(substream, group);
2014 group = NULL; /* assigned, don't free this one below */
2015 }
2016 target_group = substream->group;
2017 snd_pcm_stream_unlock_irq(substream);
2018
2019 snd_pcm_group_lock_irq(target_group, nonatomic);
2020 snd_pcm_stream_lock(substream1);
2021 snd_pcm_group_assign(substream1, target_group);
2022 refcount_inc(&target_group->refs);
2023 snd_pcm_stream_unlock(substream1);
2024 snd_pcm_group_unlock_irq(target_group, nonatomic);
2025 _end:
2026 up_write(&snd_pcm_link_rwsem);
2027 _nolock:
2028 kfree(group);
2029 _badf:
2030 fdput(f);
2031 return res;
2032}
2033
2034static void relink_to_local(struct snd_pcm_substream *substream)
2035{
2036 snd_pcm_stream_lock(substream);
2037 snd_pcm_group_assign(substream, &substream->self_group);
2038 snd_pcm_stream_unlock(substream);
2039}
2040
2041static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2042{
2043 struct snd_pcm_group *group;
2044 bool nonatomic = substream->pcm->nonatomic;
2045 bool do_free = false;
2046 int res = 0;
2047
2048 down_write(&snd_pcm_link_rwsem);
2049
2050 if (!snd_pcm_stream_linked(substream)) {
2051 res = -EALREADY;
2052 goto _end;
2053 }
2054
2055 group = substream->group;
2056 snd_pcm_group_lock_irq(group, nonatomic);
2057
2058 relink_to_local(substream);
2059 refcount_dec(&group->refs);
2060
2061 /* detach the last stream, too */
2062 if (list_is_singular(&group->substreams)) {
2063 relink_to_local(list_first_entry(&group->substreams,
2064 struct snd_pcm_substream,
2065 link_list));
2066 do_free = refcount_dec_and_test(&group->refs);
2067 }
2068
2069 snd_pcm_group_unlock_irq(group, nonatomic);
2070 if (do_free)
2071 kfree(group);
2072
2073 _end:
2074 up_write(&snd_pcm_link_rwsem);
2075 return res;
2076}
2077
2078/*
2079 * hw configurator
2080 */
2081static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2082 struct snd_pcm_hw_rule *rule)
2083{
2084 struct snd_interval t;
2085 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2086 hw_param_interval_c(params, rule->deps[1]), &t);
2087 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2088}
2089
2090static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2091 struct snd_pcm_hw_rule *rule)
2092{
2093 struct snd_interval t;
2094 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2095 hw_param_interval_c(params, rule->deps[1]), &t);
2096 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2097}
2098
2099static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2100 struct snd_pcm_hw_rule *rule)
2101{
2102 struct snd_interval t;
2103 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2104 hw_param_interval_c(params, rule->deps[1]),
2105 (unsigned long) rule->private, &t);
2106 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2107}
2108
2109static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2110 struct snd_pcm_hw_rule *rule)
2111{
2112 struct snd_interval t;
2113 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2114 (unsigned long) rule->private,
2115 hw_param_interval_c(params, rule->deps[1]), &t);
2116 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2117}
2118
2119static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2120 struct snd_pcm_hw_rule *rule)
2121{
2122 unsigned int k;
2123 const struct snd_interval *i =
2124 hw_param_interval_c(params, rule->deps[0]);
2125 struct snd_mask m;
2126 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2127 snd_mask_any(&m);
2128 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2129 int bits;
2130 if (! snd_mask_test(mask, k))
2131 continue;
2132 bits = snd_pcm_format_physical_width(k);
2133 if (bits <= 0)
2134 continue; /* ignore invalid formats */
2135 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2136 snd_mask_reset(&m, k);
2137 }
2138 return snd_mask_refine(mask, &m);
2139}
2140
2141static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2142 struct snd_pcm_hw_rule *rule)
2143{
2144 struct snd_interval t;
2145 unsigned int k;
2146 t.min = UINT_MAX;
2147 t.max = 0;
2148 t.openmin = 0;
2149 t.openmax = 0;
2150 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2151 int bits;
2152 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2153 continue;
2154 bits = snd_pcm_format_physical_width(k);
2155 if (bits <= 0)
2156 continue; /* ignore invalid formats */
2157 if (t.min > (unsigned)bits)
2158 t.min = bits;
2159 if (t.max < (unsigned)bits)
2160 t.max = bits;
2161 }
2162 t.integer = 1;
2163 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2164}
2165
2166#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2167#error "Change this table"
2168#endif
2169
2170static const unsigned int rates[] = {
2171 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2172 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2173};
2174
2175const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2176 .count = ARRAY_SIZE(rates),
2177 .list = rates,
2178};
2179
2180static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2181 struct snd_pcm_hw_rule *rule)
2182{
2183 struct snd_pcm_hardware *hw = rule->private;
2184 return snd_interval_list(hw_param_interval(params, rule->var),
2185 snd_pcm_known_rates.count,
2186 snd_pcm_known_rates.list, hw->rates);
2187}
2188
2189static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2190 struct snd_pcm_hw_rule *rule)
2191{
2192 struct snd_interval t;
2193 struct snd_pcm_substream *substream = rule->private;
2194 t.min = 0;
2195 t.max = substream->buffer_bytes_max;
2196 t.openmin = 0;
2197 t.openmax = 0;
2198 t.integer = 1;
2199 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2200}
2201
2202int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2203{
2204 struct snd_pcm_runtime *runtime = substream->runtime;
2205 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2206 int k, err;
2207
2208 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2209 snd_mask_any(constrs_mask(constrs, k));
2210 }
2211
2212 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2213 snd_interval_any(constrs_interval(constrs, k));
2214 }
2215
2216 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2217 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2218 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2219 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2220 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2221
2222 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2223 snd_pcm_hw_rule_format, NULL,
2224 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2225 if (err < 0)
2226 return err;
2227 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2228 snd_pcm_hw_rule_sample_bits, NULL,
2229 SNDRV_PCM_HW_PARAM_FORMAT,
2230 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2231 if (err < 0)
2232 return err;
2233 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2234 snd_pcm_hw_rule_div, NULL,
2235 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2236 if (err < 0)
2237 return err;
2238 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2239 snd_pcm_hw_rule_mul, NULL,
2240 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2241 if (err < 0)
2242 return err;
2243 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2244 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2245 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2246 if (err < 0)
2247 return err;
2248 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2249 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2250 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2251 if (err < 0)
2252 return err;
2253 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2254 snd_pcm_hw_rule_div, NULL,
2255 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2256 if (err < 0)
2257 return err;
2258 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2259 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2260 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2261 if (err < 0)
2262 return err;
2263 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2264 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2265 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2266 if (err < 0)
2267 return err;
2268 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2269 snd_pcm_hw_rule_div, NULL,
2270 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2271 if (err < 0)
2272 return err;
2273 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2274 snd_pcm_hw_rule_div, NULL,
2275 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2276 if (err < 0)
2277 return err;
2278 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2279 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2280 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2281 if (err < 0)
2282 return err;
2283 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2284 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2285 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2286 if (err < 0)
2287 return err;
2288 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2289 snd_pcm_hw_rule_mul, NULL,
2290 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2291 if (err < 0)
2292 return err;
2293 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2294 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2295 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2296 if (err < 0)
2297 return err;
2298 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2299 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2300 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2301 if (err < 0)
2302 return err;
2303 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2304 snd_pcm_hw_rule_muldivk, (void*) 8,
2305 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2306 if (err < 0)
2307 return err;
2308 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2309 snd_pcm_hw_rule_muldivk, (void*) 8,
2310 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2311 if (err < 0)
2312 return err;
2313 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2314 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2315 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2316 if (err < 0)
2317 return err;
2318 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2319 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2320 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2321 if (err < 0)
2322 return err;
2323 return 0;
2324}
2325
2326int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2327{
2328 struct snd_pcm_runtime *runtime = substream->runtime;
2329 struct snd_pcm_hardware *hw = &runtime->hw;
2330 int err;
2331 unsigned int mask = 0;
2332
2333 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2334 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2335 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2336 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2337 if (hw_support_mmap(substream)) {
2338 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2339 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2340 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2341 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2342 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2343 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2344 }
2345 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2346 if (err < 0)
2347 return err;
2348
2349 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2350 if (err < 0)
2351 return err;
2352
2353 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2354 if (err < 0)
2355 return err;
2356
2357 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2358 hw->channels_min, hw->channels_max);
2359 if (err < 0)
2360 return err;
2361
2362 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2363 hw->rate_min, hw->rate_max);
2364 if (err < 0)
2365 return err;
2366
2367 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2368 hw->period_bytes_min, hw->period_bytes_max);
2369 if (err < 0)
2370 return err;
2371
2372 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2373 hw->periods_min, hw->periods_max);
2374 if (err < 0)
2375 return err;
2376
2377 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2378 hw->period_bytes_min, hw->buffer_bytes_max);
2379 if (err < 0)
2380 return err;
2381
2382 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2383 snd_pcm_hw_rule_buffer_bytes_max, substream,
2384 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2385 if (err < 0)
2386 return err;
2387
2388 /* FIXME: remove */
2389 if (runtime->dma_bytes) {
2390 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2391 if (err < 0)
2392 return err;
2393 }
2394
2395 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2396 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2397 snd_pcm_hw_rule_rate, hw,
2398 SNDRV_PCM_HW_PARAM_RATE, -1);
2399 if (err < 0)
2400 return err;
2401 }
2402
2403 /* FIXME: this belong to lowlevel */
2404 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2405
2406 return 0;
2407}
2408
2409static void pcm_release_private(struct snd_pcm_substream *substream)
2410{
2411 if (snd_pcm_stream_linked(substream))
2412 snd_pcm_unlink(substream);
2413}
2414
2415void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2416{
2417 substream->ref_count--;
2418 if (substream->ref_count > 0)
2419 return;
2420
2421 snd_pcm_drop(substream);
2422 if (substream->hw_opened) {
2423 if (substream->ops->hw_free &&
2424 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2425 substream->ops->hw_free(substream);
2426 substream->ops->close(substream);
2427 substream->hw_opened = 0;
2428 }
2429 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2430 pm_qos_remove_request(&substream->latency_pm_qos_req);
2431 if (substream->pcm_release) {
2432 substream->pcm_release(substream);
2433 substream->pcm_release = NULL;
2434 }
2435 snd_pcm_detach_substream(substream);
2436}
2437EXPORT_SYMBOL(snd_pcm_release_substream);
2438
2439int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2440 struct file *file,
2441 struct snd_pcm_substream **rsubstream)
2442{
2443 struct snd_pcm_substream *substream;
2444 int err;
2445
2446 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2447 if (err < 0)
2448 return err;
2449 if (substream->ref_count > 1) {
2450 *rsubstream = substream;
2451 return 0;
2452 }
2453
2454 err = snd_pcm_hw_constraints_init(substream);
2455 if (err < 0) {
2456 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2457 goto error;
2458 }
2459
2460 if ((err = substream->ops->open(substream)) < 0)
2461 goto error;
2462
2463 substream->hw_opened = 1;
2464
2465 err = snd_pcm_hw_constraints_complete(substream);
2466 if (err < 0) {
2467 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2468 goto error;
2469 }
2470
2471 *rsubstream = substream;
2472 return 0;
2473
2474 error:
2475 snd_pcm_release_substream(substream);
2476 return err;
2477}
2478EXPORT_SYMBOL(snd_pcm_open_substream);
2479
2480static int snd_pcm_open_file(struct file *file,
2481 struct snd_pcm *pcm,
2482 int stream)
2483{
2484 struct snd_pcm_file *pcm_file;
2485 struct snd_pcm_substream *substream;
2486 int err;
2487
2488 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2489 if (err < 0)
2490 return err;
2491
2492 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2493 if (pcm_file == NULL) {
2494 snd_pcm_release_substream(substream);
2495 return -ENOMEM;
2496 }
2497 pcm_file->substream = substream;
2498 if (substream->ref_count == 1)
2499 substream->pcm_release = pcm_release_private;
2500 file->private_data = pcm_file;
2501
2502 return 0;
2503}
2504
2505static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2506{
2507 struct snd_pcm *pcm;
2508 int err = nonseekable_open(inode, file);
2509 if (err < 0)
2510 return err;
2511 pcm = snd_lookup_minor_data(iminor(inode),
2512 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2513 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2514 if (pcm)
2515 snd_card_unref(pcm->card);
2516 return err;
2517}
2518
2519static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2520{
2521 struct snd_pcm *pcm;
2522 int err = nonseekable_open(inode, file);
2523 if (err < 0)
2524 return err;
2525 pcm = snd_lookup_minor_data(iminor(inode),
2526 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2527 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2528 if (pcm)
2529 snd_card_unref(pcm->card);
2530 return err;
2531}
2532
2533static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2534{
2535 int err;
2536 wait_queue_entry_t wait;
2537
2538 if (pcm == NULL) {
2539 err = -ENODEV;
2540 goto __error1;
2541 }
2542 err = snd_card_file_add(pcm->card, file);
2543 if (err < 0)
2544 goto __error1;
2545 if (!try_module_get(pcm->card->module)) {
2546 err = -EFAULT;
2547 goto __error2;
2548 }
2549 init_waitqueue_entry(&wait, current);
2550 add_wait_queue(&pcm->open_wait, &wait);
2551 mutex_lock(&pcm->open_mutex);
2552 while (1) {
2553 err = snd_pcm_open_file(file, pcm, stream);
2554 if (err >= 0)
2555 break;
2556 if (err == -EAGAIN) {
2557 if (file->f_flags & O_NONBLOCK) {
2558 err = -EBUSY;
2559 break;
2560 }
2561 } else
2562 break;
2563 set_current_state(TASK_INTERRUPTIBLE);
2564 mutex_unlock(&pcm->open_mutex);
2565 schedule();
2566 mutex_lock(&pcm->open_mutex);
2567 if (pcm->card->shutdown) {
2568 err = -ENODEV;
2569 break;
2570 }
2571 if (signal_pending(current)) {
2572 err = -ERESTARTSYS;
2573 break;
2574 }
2575 }
2576 remove_wait_queue(&pcm->open_wait, &wait);
2577 mutex_unlock(&pcm->open_mutex);
2578 if (err < 0)
2579 goto __error;
2580 return err;
2581
2582 __error:
2583 module_put(pcm->card->module);
2584 __error2:
2585 snd_card_file_remove(pcm->card, file);
2586 __error1:
2587 return err;
2588}
2589
2590static int snd_pcm_release(struct inode *inode, struct file *file)
2591{
2592 struct snd_pcm *pcm;
2593 struct snd_pcm_substream *substream;
2594 struct snd_pcm_file *pcm_file;
2595
2596 pcm_file = file->private_data;
2597 substream = pcm_file->substream;
2598 if (snd_BUG_ON(!substream))
2599 return -ENXIO;
2600 pcm = substream->pcm;
2601 mutex_lock(&pcm->open_mutex);
2602 snd_pcm_release_substream(substream);
2603 kfree(pcm_file);
2604 mutex_unlock(&pcm->open_mutex);
2605 wake_up(&pcm->open_wait);
2606 module_put(pcm->card->module);
2607 snd_card_file_remove(pcm->card, file);
2608 return 0;
2609}
2610
2611/* check and update PCM state; return 0 or a negative error
2612 * call this inside PCM lock
2613 */
2614static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2615{
2616 switch (substream->runtime->status->state) {
2617 case SNDRV_PCM_STATE_DRAINING:
2618 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2619 return -EBADFD;
2620 /* Fall through */
2621 case SNDRV_PCM_STATE_RUNNING:
2622 return snd_pcm_update_hw_ptr(substream);
2623 case SNDRV_PCM_STATE_PREPARED:
2624 case SNDRV_PCM_STATE_PAUSED:
2625 return 0;
2626 case SNDRV_PCM_STATE_SUSPENDED:
2627 return -ESTRPIPE;
2628 case SNDRV_PCM_STATE_XRUN:
2629 return -EPIPE;
2630 default:
2631 return -EBADFD;
2632 }
2633}
2634
2635/* increase the appl_ptr; returns the processed frames or a negative error */
2636static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2637 snd_pcm_uframes_t frames,
2638 snd_pcm_sframes_t avail)
2639{
2640 struct snd_pcm_runtime *runtime = substream->runtime;
2641 snd_pcm_sframes_t appl_ptr;
2642 int ret;
2643
2644 if (avail <= 0)
2645 return 0;
2646 if (frames > (snd_pcm_uframes_t)avail)
2647 frames = avail;
2648 appl_ptr = runtime->control->appl_ptr + frames;
2649 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2650 appl_ptr -= runtime->boundary;
2651 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2652 return ret < 0 ? ret : frames;
2653}
2654
2655/* decrease the appl_ptr; returns the processed frames or zero for error */
2656static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2657 snd_pcm_uframes_t frames,
2658 snd_pcm_sframes_t avail)
2659{
2660 struct snd_pcm_runtime *runtime = substream->runtime;
2661 snd_pcm_sframes_t appl_ptr;
2662 int ret;
2663
2664 if (avail <= 0)
2665 return 0;
2666 if (frames > (snd_pcm_uframes_t)avail)
2667 frames = avail;
2668 appl_ptr = runtime->control->appl_ptr - frames;
2669 if (appl_ptr < 0)
2670 appl_ptr += runtime->boundary;
2671 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2672 /* NOTE: we return zero for errors because PulseAudio gets depressed
2673 * upon receiving an error from rewind ioctl and stops processing
2674 * any longer. Returning zero means that no rewind is done, so
2675 * it's not absolutely wrong to answer like that.
2676 */
2677 return ret < 0 ? 0 : frames;
2678}
2679
2680static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2681 snd_pcm_uframes_t frames)
2682{
2683 snd_pcm_sframes_t ret;
2684
2685 if (frames == 0)
2686 return 0;
2687
2688 snd_pcm_stream_lock_irq(substream);
2689 ret = do_pcm_hwsync(substream);
2690 if (!ret)
2691 ret = rewind_appl_ptr(substream, frames,
2692 snd_pcm_hw_avail(substream));
2693 snd_pcm_stream_unlock_irq(substream);
2694 return ret;
2695}
2696
2697static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2698 snd_pcm_uframes_t frames)
2699{
2700 snd_pcm_sframes_t ret;
2701
2702 if (frames == 0)
2703 return 0;
2704
2705 snd_pcm_stream_lock_irq(substream);
2706 ret = do_pcm_hwsync(substream);
2707 if (!ret)
2708 ret = forward_appl_ptr(substream, frames,
2709 snd_pcm_avail(substream));
2710 snd_pcm_stream_unlock_irq(substream);
2711 return ret;
2712}
2713
2714static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2715{
2716 int err;
2717
2718 snd_pcm_stream_lock_irq(substream);
2719 err = do_pcm_hwsync(substream);
2720 snd_pcm_stream_unlock_irq(substream);
2721 return err;
2722}
2723
2724static int snd_pcm_delay(struct snd_pcm_substream *substream,
2725 snd_pcm_sframes_t *delay)
2726{
2727 int err;
2728 snd_pcm_sframes_t n = 0;
2729
2730 snd_pcm_stream_lock_irq(substream);
2731 err = do_pcm_hwsync(substream);
2732 if (!err)
2733 n = snd_pcm_calc_delay(substream);
2734 snd_pcm_stream_unlock_irq(substream);
2735 if (!err)
2736 *delay = n;
2737 return err;
2738}
2739
2740static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2741 struct snd_pcm_sync_ptr __user *_sync_ptr)
2742{
2743 struct snd_pcm_runtime *runtime = substream->runtime;
2744 struct snd_pcm_sync_ptr sync_ptr;
2745 volatile struct snd_pcm_mmap_status *status;
2746 volatile struct snd_pcm_mmap_control *control;
2747 int err;
2748
2749 memset(&sync_ptr, 0, sizeof(sync_ptr));
2750 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2751 return -EFAULT;
2752 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2753 return -EFAULT;
2754 status = runtime->status;
2755 control = runtime->control;
2756 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2757 err = snd_pcm_hwsync(substream);
2758 if (err < 0)
2759 return err;
2760 }
2761 snd_pcm_stream_lock_irq(substream);
2762 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2763 err = pcm_lib_apply_appl_ptr(substream,
2764 sync_ptr.c.control.appl_ptr);
2765 if (err < 0) {
2766 snd_pcm_stream_unlock_irq(substream);
2767 return err;
2768 }
2769 } else {
2770 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2771 }
2772 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2773 control->avail_min = sync_ptr.c.control.avail_min;
2774 else
2775 sync_ptr.c.control.avail_min = control->avail_min;
2776 sync_ptr.s.status.state = status->state;
2777 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2778 sync_ptr.s.status.tstamp = status->tstamp;
2779 sync_ptr.s.status.suspended_state = status->suspended_state;
2780 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2781 snd_pcm_stream_unlock_irq(substream);
2782 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2783 return -EFAULT;
2784 return 0;
2785}
2786
2787static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2788{
2789 struct snd_pcm_runtime *runtime = substream->runtime;
2790 int arg;
2791
2792 if (get_user(arg, _arg))
2793 return -EFAULT;
2794 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2795 return -EINVAL;
2796 runtime->tstamp_type = arg;
2797 return 0;
2798}
2799
2800static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2801 struct snd_xferi __user *_xferi)
2802{
2803 struct snd_xferi xferi;
2804 struct snd_pcm_runtime *runtime = substream->runtime;
2805 snd_pcm_sframes_t result;
2806
2807 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2808 return -EBADFD;
2809 if (put_user(0, &_xferi->result))
2810 return -EFAULT;
2811 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2812 return -EFAULT;
2813 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2814 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2815 else
2816 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2817 __put_user(result, &_xferi->result);
2818 return result < 0 ? result : 0;
2819}
2820
2821static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2822 struct snd_xfern __user *_xfern)
2823{
2824 struct snd_xfern xfern;
2825 struct snd_pcm_runtime *runtime = substream->runtime;
2826 void *bufs;
2827 snd_pcm_sframes_t result;
2828
2829 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2830 return -EBADFD;
2831 if (runtime->channels > 128)
2832 return -EINVAL;
2833 if (put_user(0, &_xfern->result))
2834 return -EFAULT;
2835 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2836 return -EFAULT;
2837
2838 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2839 if (IS_ERR(bufs))
2840 return PTR_ERR(bufs);
2841 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2842 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2843 else
2844 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2845 kfree(bufs);
2846 __put_user(result, &_xfern->result);
2847 return result < 0 ? result : 0;
2848}
2849
2850static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2851 snd_pcm_uframes_t __user *_frames)
2852{
2853 snd_pcm_uframes_t frames;
2854 snd_pcm_sframes_t result;
2855
2856 if (get_user(frames, _frames))
2857 return -EFAULT;
2858 if (put_user(0, _frames))
2859 return -EFAULT;
2860 result = snd_pcm_rewind(substream, frames);
2861 __put_user(result, _frames);
2862 return result < 0 ? result : 0;
2863}
2864
2865static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2866 snd_pcm_uframes_t __user *_frames)
2867{
2868 snd_pcm_uframes_t frames;
2869 snd_pcm_sframes_t result;
2870
2871 if (get_user(frames, _frames))
2872 return -EFAULT;
2873 if (put_user(0, _frames))
2874 return -EFAULT;
2875 result = snd_pcm_forward(substream, frames);
2876 __put_user(result, _frames);
2877 return result < 0 ? result : 0;
2878}
2879
2880static int snd_pcm_common_ioctl(struct file *file,
2881 struct snd_pcm_substream *substream,
2882 unsigned int cmd, void __user *arg)
2883{
2884 struct snd_pcm_file *pcm_file = file->private_data;
2885 int res;
2886
2887 if (PCM_RUNTIME_CHECK(substream))
2888 return -ENXIO;
2889
2890 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2891 if (res < 0)
2892 return res;
2893
2894 switch (cmd) {
2895 case SNDRV_PCM_IOCTL_PVERSION:
2896 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2897 case SNDRV_PCM_IOCTL_INFO:
2898 return snd_pcm_info_user(substream, arg);
2899 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2900 return 0;
2901 case SNDRV_PCM_IOCTL_TTSTAMP:
2902 return snd_pcm_tstamp(substream, arg);
2903 case SNDRV_PCM_IOCTL_USER_PVERSION:
2904 if (get_user(pcm_file->user_pversion,
2905 (unsigned int __user *)arg))
2906 return -EFAULT;
2907 return 0;
2908 case SNDRV_PCM_IOCTL_HW_REFINE:
2909 return snd_pcm_hw_refine_user(substream, arg);
2910 case SNDRV_PCM_IOCTL_HW_PARAMS:
2911 return snd_pcm_hw_params_user(substream, arg);
2912 case SNDRV_PCM_IOCTL_HW_FREE:
2913 return snd_pcm_hw_free(substream);
2914 case SNDRV_PCM_IOCTL_SW_PARAMS:
2915 return snd_pcm_sw_params_user(substream, arg);
2916 case SNDRV_PCM_IOCTL_STATUS:
2917 return snd_pcm_status_user(substream, arg, false);
2918 case SNDRV_PCM_IOCTL_STATUS_EXT:
2919 return snd_pcm_status_user(substream, arg, true);
2920 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2921 return snd_pcm_channel_info_user(substream, arg);
2922 case SNDRV_PCM_IOCTL_PREPARE:
2923 return snd_pcm_prepare(substream, file);
2924 case SNDRV_PCM_IOCTL_RESET:
2925 return snd_pcm_reset(substream);
2926 case SNDRV_PCM_IOCTL_START:
2927 return snd_pcm_start_lock_irq(substream);
2928 case SNDRV_PCM_IOCTL_LINK:
2929 return snd_pcm_link(substream, (int)(unsigned long) arg);
2930 case SNDRV_PCM_IOCTL_UNLINK:
2931 return snd_pcm_unlink(substream);
2932 case SNDRV_PCM_IOCTL_RESUME:
2933 return snd_pcm_resume(substream);
2934 case SNDRV_PCM_IOCTL_XRUN:
2935 return snd_pcm_xrun(substream);
2936 case SNDRV_PCM_IOCTL_HWSYNC:
2937 return snd_pcm_hwsync(substream);
2938 case SNDRV_PCM_IOCTL_DELAY:
2939 {
2940 snd_pcm_sframes_t delay;
2941 snd_pcm_sframes_t __user *res = arg;
2942 int err;
2943
2944 err = snd_pcm_delay(substream, &delay);
2945 if (err)
2946 return err;
2947 if (put_user(delay, res))
2948 return -EFAULT;
2949 return 0;
2950 }
2951 case SNDRV_PCM_IOCTL_SYNC_PTR:
2952 return snd_pcm_sync_ptr(substream, arg);
2953#ifdef CONFIG_SND_SUPPORT_OLD_API
2954 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2955 return snd_pcm_hw_refine_old_user(substream, arg);
2956 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2957 return snd_pcm_hw_params_old_user(substream, arg);
2958#endif
2959 case SNDRV_PCM_IOCTL_DRAIN:
2960 return snd_pcm_drain(substream, file);
2961 case SNDRV_PCM_IOCTL_DROP:
2962 return snd_pcm_drop(substream);
2963 case SNDRV_PCM_IOCTL_PAUSE:
2964 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2965 substream,
2966 (int)(unsigned long)arg);
2967 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2968 case SNDRV_PCM_IOCTL_READI_FRAMES:
2969 return snd_pcm_xferi_frames_ioctl(substream, arg);
2970 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2971 case SNDRV_PCM_IOCTL_READN_FRAMES:
2972 return snd_pcm_xfern_frames_ioctl(substream, arg);
2973 case SNDRV_PCM_IOCTL_REWIND:
2974 return snd_pcm_rewind_ioctl(substream, arg);
2975 case SNDRV_PCM_IOCTL_FORWARD:
2976 return snd_pcm_forward_ioctl(substream, arg);
2977 }
2978 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2979 return -ENOTTY;
2980}
2981
2982static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2983 unsigned long arg)
2984{
2985 struct snd_pcm_file *pcm_file;
2986
2987 pcm_file = file->private_data;
2988
2989 if (((cmd >> 8) & 0xff) != 'A')
2990 return -ENOTTY;
2991
2992 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2993 (void __user *)arg);
2994}
2995
2996/**
2997 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2998 * @substream: PCM substream
2999 * @cmd: IOCTL cmd
3000 * @arg: IOCTL argument
3001 *
3002 * The function is provided primarily for OSS layer and USB gadget drivers,
3003 * and it allows only the limited set of ioctls (hw_params, sw_params,
3004 * prepare, start, drain, drop, forward).
3005 */
3006int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3007 unsigned int cmd, void *arg)
3008{
3009 snd_pcm_uframes_t *frames = arg;
3010 snd_pcm_sframes_t result;
3011
3012 switch (cmd) {
3013 case SNDRV_PCM_IOCTL_FORWARD:
3014 {
3015 /* provided only for OSS; capture-only and no value returned */
3016 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3017 return -EINVAL;
3018 result = snd_pcm_forward(substream, *frames);
3019 return result < 0 ? result : 0;
3020 }
3021 case SNDRV_PCM_IOCTL_HW_PARAMS:
3022 return snd_pcm_hw_params(substream, arg);
3023 case SNDRV_PCM_IOCTL_SW_PARAMS:
3024 return snd_pcm_sw_params(substream, arg);
3025 case SNDRV_PCM_IOCTL_PREPARE:
3026 return snd_pcm_prepare(substream, NULL);
3027 case SNDRV_PCM_IOCTL_START:
3028 return snd_pcm_start_lock_irq(substream);
3029 case SNDRV_PCM_IOCTL_DRAIN:
3030 return snd_pcm_drain(substream, NULL);
3031 case SNDRV_PCM_IOCTL_DROP:
3032 return snd_pcm_drop(substream);
3033 case SNDRV_PCM_IOCTL_DELAY:
3034 return snd_pcm_delay(substream, frames);
3035 default:
3036 return -EINVAL;
3037 }
3038}
3039EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3040
3041static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3042 loff_t * offset)
3043{
3044 struct snd_pcm_file *pcm_file;
3045 struct snd_pcm_substream *substream;
3046 struct snd_pcm_runtime *runtime;
3047 snd_pcm_sframes_t result;
3048
3049 pcm_file = file->private_data;
3050 substream = pcm_file->substream;
3051 if (PCM_RUNTIME_CHECK(substream))
3052 return -ENXIO;
3053 runtime = substream->runtime;
3054 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3055 return -EBADFD;
3056 if (!frame_aligned(runtime, count))
3057 return -EINVAL;
3058 count = bytes_to_frames(runtime, count);
3059 result = snd_pcm_lib_read(substream, buf, count);
3060 if (result > 0)
3061 result = frames_to_bytes(runtime, result);
3062 return result;
3063}
3064
3065static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3066 size_t count, loff_t * offset)
3067{
3068 struct snd_pcm_file *pcm_file;
3069 struct snd_pcm_substream *substream;
3070 struct snd_pcm_runtime *runtime;
3071 snd_pcm_sframes_t result;
3072
3073 pcm_file = file->private_data;
3074 substream = pcm_file->substream;
3075 if (PCM_RUNTIME_CHECK(substream))
3076 return -ENXIO;
3077 runtime = substream->runtime;
3078 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3079 return -EBADFD;
3080 if (!frame_aligned(runtime, count))
3081 return -EINVAL;
3082 count = bytes_to_frames(runtime, count);
3083 result = snd_pcm_lib_write(substream, buf, count);
3084 if (result > 0)
3085 result = frames_to_bytes(runtime, result);
3086 return result;
3087}
3088
3089static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3090{
3091 struct snd_pcm_file *pcm_file;
3092 struct snd_pcm_substream *substream;
3093 struct snd_pcm_runtime *runtime;
3094 snd_pcm_sframes_t result;
3095 unsigned long i;
3096 void __user **bufs;
3097 snd_pcm_uframes_t frames;
3098
3099 pcm_file = iocb->ki_filp->private_data;
3100 substream = pcm_file->substream;
3101 if (PCM_RUNTIME_CHECK(substream))
3102 return -ENXIO;
3103 runtime = substream->runtime;
3104 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3105 return -EBADFD;
3106 if (!iter_is_iovec(to))
3107 return -EINVAL;
3108 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3109 return -EINVAL;
3110 if (!frame_aligned(runtime, to->iov->iov_len))
3111 return -EINVAL;
3112 frames = bytes_to_samples(runtime, to->iov->iov_len);
3113 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3114 if (bufs == NULL)
3115 return -ENOMEM;
3116 for (i = 0; i < to->nr_segs; ++i)
3117 bufs[i] = to->iov[i].iov_base;
3118 result = snd_pcm_lib_readv(substream, bufs, frames);
3119 if (result > 0)
3120 result = frames_to_bytes(runtime, result);
3121 kfree(bufs);
3122 return result;
3123}
3124
3125static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3126{
3127 struct snd_pcm_file *pcm_file;
3128 struct snd_pcm_substream *substream;
3129 struct snd_pcm_runtime *runtime;
3130 snd_pcm_sframes_t result;
3131 unsigned long i;
3132 void __user **bufs;
3133 snd_pcm_uframes_t frames;
3134
3135 pcm_file = iocb->ki_filp->private_data;
3136 substream = pcm_file->substream;
3137 if (PCM_RUNTIME_CHECK(substream))
3138 return -ENXIO;
3139 runtime = substream->runtime;
3140 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3141 return -EBADFD;
3142 if (!iter_is_iovec(from))
3143 return -EINVAL;
3144 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3145 !frame_aligned(runtime, from->iov->iov_len))
3146 return -EINVAL;
3147 frames = bytes_to_samples(runtime, from->iov->iov_len);
3148 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3149 if (bufs == NULL)
3150 return -ENOMEM;
3151 for (i = 0; i < from->nr_segs; ++i)
3152 bufs[i] = from->iov[i].iov_base;
3153 result = snd_pcm_lib_writev(substream, bufs, frames);
3154 if (result > 0)
3155 result = frames_to_bytes(runtime, result);
3156 kfree(bufs);
3157 return result;
3158}
3159
3160static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3161{
3162 struct snd_pcm_file *pcm_file;
3163 struct snd_pcm_substream *substream;
3164 struct snd_pcm_runtime *runtime;
3165 __poll_t mask, ok;
3166 snd_pcm_uframes_t avail;
3167
3168 pcm_file = file->private_data;
3169
3170 substream = pcm_file->substream;
3171 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3172 ok = EPOLLOUT | EPOLLWRNORM;
3173 else
3174 ok = EPOLLIN | EPOLLRDNORM;
3175 if (PCM_RUNTIME_CHECK(substream))
3176 return ok | EPOLLERR;
3177
3178 runtime = substream->runtime;
3179 poll_wait(file, &runtime->sleep, wait);
3180
3181 mask = 0;
3182 snd_pcm_stream_lock_irq(substream);
3183 avail = snd_pcm_avail(substream);
3184 switch (runtime->status->state) {
3185 case SNDRV_PCM_STATE_RUNNING:
3186 case SNDRV_PCM_STATE_PREPARED:
3187 case SNDRV_PCM_STATE_PAUSED:
3188 if (avail >= runtime->control->avail_min)
3189 mask = ok;
3190 break;
3191 case SNDRV_PCM_STATE_DRAINING:
3192 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3193 mask = ok;
3194 if (!avail)
3195 mask |= EPOLLERR;
3196 }
3197 break;
3198 default:
3199 mask = ok | EPOLLERR;
3200 break;
3201 }
3202 snd_pcm_stream_unlock_irq(substream);
3203 return mask;
3204}
3205
3206/*
3207 * mmap support
3208 */
3209
3210/*
3211 * Only on coherent architectures, we can mmap the status and the control records
3212 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3213 */
3214#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3215/*
3216 * mmap status record
3217 */
3218static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3219{
3220 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3221 struct snd_pcm_runtime *runtime;
3222
3223 if (substream == NULL)
3224 return VM_FAULT_SIGBUS;
3225 runtime = substream->runtime;
3226 vmf->page = virt_to_page(runtime->status);
3227 get_page(vmf->page);
3228 return 0;
3229}
3230
3231static const struct vm_operations_struct snd_pcm_vm_ops_status =
3232{
3233 .fault = snd_pcm_mmap_status_fault,
3234};
3235
3236static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3237 struct vm_area_struct *area)
3238{
3239 long size;
3240 if (!(area->vm_flags & VM_READ))
3241 return -EINVAL;
3242 size = area->vm_end - area->vm_start;
3243 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3244 return -EINVAL;
3245 area->vm_ops = &snd_pcm_vm_ops_status;
3246 area->vm_private_data = substream;
3247 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3248 return 0;
3249}
3250
3251/*
3252 * mmap control record
3253 */
3254static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3255{
3256 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3257 struct snd_pcm_runtime *runtime;
3258
3259 if (substream == NULL)
3260 return VM_FAULT_SIGBUS;
3261 runtime = substream->runtime;
3262 vmf->page = virt_to_page(runtime->control);
3263 get_page(vmf->page);
3264 return 0;
3265}
3266
3267static const struct vm_operations_struct snd_pcm_vm_ops_control =
3268{
3269 .fault = snd_pcm_mmap_control_fault,
3270};
3271
3272static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3273 struct vm_area_struct *area)
3274{
3275 long size;
3276 if (!(area->vm_flags & VM_READ))
3277 return -EINVAL;
3278 size = area->vm_end - area->vm_start;
3279 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3280 return -EINVAL;
3281 area->vm_ops = &snd_pcm_vm_ops_control;
3282 area->vm_private_data = substream;
3283 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3284 return 0;
3285}
3286
3287static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3288{
3289 if (pcm_file->no_compat_mmap)
3290 return false;
3291 /* See pcm_control_mmap_allowed() below.
3292 * Since older alsa-lib requires both status and control mmaps to be
3293 * coupled, we have to disable the status mmap for old alsa-lib, too.
3294 */
3295 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3296 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3297 return false;
3298 return true;
3299}
3300
3301static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3302{
3303 if (pcm_file->no_compat_mmap)
3304 return false;
3305 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3306 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3307 * thus it effectively assures the manual update of appl_ptr.
3308 */
3309 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3310 return false;
3311 return true;
3312}
3313
3314#else /* ! coherent mmap */
3315/*
3316 * don't support mmap for status and control records.
3317 */
3318#define pcm_status_mmap_allowed(pcm_file) false
3319#define pcm_control_mmap_allowed(pcm_file) false
3320
3321static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3322 struct vm_area_struct *area)
3323{
3324 return -ENXIO;
3325}
3326static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3327 struct vm_area_struct *area)
3328{
3329 return -ENXIO;
3330}
3331#endif /* coherent mmap */
3332
3333static inline struct page *
3334snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3335{
3336 void *vaddr = substream->runtime->dma_area + ofs;
3337 return virt_to_page(vaddr);
3338}
3339
3340/*
3341 * fault callback for mmapping a RAM page
3342 */
3343static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3344{
3345 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3346 struct snd_pcm_runtime *runtime;
3347 unsigned long offset;
3348 struct page * page;
3349 size_t dma_bytes;
3350
3351 if (substream == NULL)
3352 return VM_FAULT_SIGBUS;
3353 runtime = substream->runtime;
3354 offset = vmf->pgoff << PAGE_SHIFT;
3355 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3356 if (offset > dma_bytes - PAGE_SIZE)
3357 return VM_FAULT_SIGBUS;
3358 if (substream->ops->page)
3359 page = substream->ops->page(substream, offset);
3360 else
3361 page = snd_pcm_default_page_ops(substream, offset);
3362 if (!page)
3363 return VM_FAULT_SIGBUS;
3364 get_page(page);
3365 vmf->page = page;
3366 return 0;
3367}
3368
3369static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3370 .open = snd_pcm_mmap_data_open,
3371 .close = snd_pcm_mmap_data_close,
3372};
3373
3374static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3375 .open = snd_pcm_mmap_data_open,
3376 .close = snd_pcm_mmap_data_close,
3377 .fault = snd_pcm_mmap_data_fault,
3378};
3379
3380/*
3381 * mmap the DMA buffer on RAM
3382 */
3383
3384/**
3385 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3386 * @substream: PCM substream
3387 * @area: VMA
3388 *
3389 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3390 * this function is invoked implicitly.
3391 */
3392int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3393 struct vm_area_struct *area)
3394{
3395 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3396#ifdef CONFIG_GENERIC_ALLOCATOR
3397 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3398 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3399 return remap_pfn_range(area, area->vm_start,
3400 substream->dma_buffer.addr >> PAGE_SHIFT,
3401 area->vm_end - area->vm_start, area->vm_page_prot);
3402 }
3403#endif /* CONFIG_GENERIC_ALLOCATOR */
3404#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3405 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3406 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3407 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3408 area,
3409 substream->runtime->dma_area,
3410 substream->runtime->dma_addr,
3411 substream->runtime->dma_bytes);
3412#endif /* CONFIG_X86 */
3413 /* mmap with fault handler */
3414 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3415 return 0;
3416}
3417EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3418
3419/*
3420 * mmap the DMA buffer on I/O memory area
3421 */
3422#if SNDRV_PCM_INFO_MMAP_IOMEM
3423/**
3424 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3425 * @substream: PCM substream
3426 * @area: VMA
3427 *
3428 * When your hardware uses the iomapped pages as the hardware buffer and
3429 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3430 * is supposed to work only on limited architectures.
3431 */
3432int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3433 struct vm_area_struct *area)
3434{
3435 struct snd_pcm_runtime *runtime = substream->runtime;
3436
3437 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3438 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3439}
3440EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3441#endif /* SNDRV_PCM_INFO_MMAP */
3442
3443/*
3444 * mmap DMA buffer
3445 */
3446int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3447 struct vm_area_struct *area)
3448{
3449 struct snd_pcm_runtime *runtime;
3450 long size;
3451 unsigned long offset;
3452 size_t dma_bytes;
3453 int err;
3454
3455 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3456 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3457 return -EINVAL;
3458 } else {
3459 if (!(area->vm_flags & VM_READ))
3460 return -EINVAL;
3461 }
3462 runtime = substream->runtime;
3463 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3464 return -EBADFD;
3465 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3466 return -ENXIO;
3467 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3468 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3469 return -EINVAL;
3470 size = area->vm_end - area->vm_start;
3471 offset = area->vm_pgoff << PAGE_SHIFT;
3472 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3473 if ((size_t)size > dma_bytes)
3474 return -EINVAL;
3475 if (offset > dma_bytes - size)
3476 return -EINVAL;
3477
3478 area->vm_ops = &snd_pcm_vm_ops_data;
3479 area->vm_private_data = substream;
3480 if (substream->ops->mmap)
3481 err = substream->ops->mmap(substream, area);
3482 else
3483 err = snd_pcm_lib_default_mmap(substream, area);
3484 if (!err)
3485 atomic_inc(&substream->mmap_count);
3486 return err;
3487}
3488EXPORT_SYMBOL(snd_pcm_mmap_data);
3489
3490static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3491{
3492 struct snd_pcm_file * pcm_file;
3493 struct snd_pcm_substream *substream;
3494 unsigned long offset;
3495
3496 pcm_file = file->private_data;
3497 substream = pcm_file->substream;
3498 if (PCM_RUNTIME_CHECK(substream))
3499 return -ENXIO;
3500
3501 offset = area->vm_pgoff << PAGE_SHIFT;
3502 switch (offset) {
3503 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3504 if (!pcm_status_mmap_allowed(pcm_file))
3505 return -ENXIO;
3506 return snd_pcm_mmap_status(substream, file, area);
3507 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3508 if (!pcm_control_mmap_allowed(pcm_file))
3509 return -ENXIO;
3510 return snd_pcm_mmap_control(substream, file, area);
3511 default:
3512 return snd_pcm_mmap_data(substream, file, area);
3513 }
3514 return 0;
3515}
3516
3517static int snd_pcm_fasync(int fd, struct file * file, int on)
3518{
3519 struct snd_pcm_file * pcm_file;
3520 struct snd_pcm_substream *substream;
3521 struct snd_pcm_runtime *runtime;
3522
3523 pcm_file = file->private_data;
3524 substream = pcm_file->substream;
3525 if (PCM_RUNTIME_CHECK(substream))
3526 return -ENXIO;
3527 runtime = substream->runtime;
3528 return fasync_helper(fd, file, on, &runtime->fasync);
3529}
3530
3531/*
3532 * ioctl32 compat
3533 */
3534#ifdef CONFIG_COMPAT
3535#include "pcm_compat.c"
3536#else
3537#define snd_pcm_ioctl_compat NULL
3538#endif
3539
3540/*
3541 * To be removed helpers to keep binary compatibility
3542 */
3543
3544#ifdef CONFIG_SND_SUPPORT_OLD_API
3545#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3546#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3547
3548static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3549 struct snd_pcm_hw_params_old *oparams)
3550{
3551 unsigned int i;
3552
3553 memset(params, 0, sizeof(*params));
3554 params->flags = oparams->flags;
3555 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3556 params->masks[i].bits[0] = oparams->masks[i];
3557 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3558 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3559 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3560 params->info = oparams->info;
3561 params->msbits = oparams->msbits;
3562 params->rate_num = oparams->rate_num;
3563 params->rate_den = oparams->rate_den;
3564 params->fifo_size = oparams->fifo_size;
3565}
3566
3567static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3568 struct snd_pcm_hw_params *params)
3569{
3570 unsigned int i;
3571
3572 memset(oparams, 0, sizeof(*oparams));
3573 oparams->flags = params->flags;
3574 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3575 oparams->masks[i] = params->masks[i].bits[0];
3576 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3577 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3578 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3579 oparams->info = params->info;
3580 oparams->msbits = params->msbits;
3581 oparams->rate_num = params->rate_num;
3582 oparams->rate_den = params->rate_den;
3583 oparams->fifo_size = params->fifo_size;
3584}
3585
3586static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3587 struct snd_pcm_hw_params_old __user * _oparams)
3588{
3589 struct snd_pcm_hw_params *params;
3590 struct snd_pcm_hw_params_old *oparams = NULL;
3591 int err;
3592
3593 params = kmalloc(sizeof(*params), GFP_KERNEL);
3594 if (!params)
3595 return -ENOMEM;
3596
3597 oparams = memdup_user(_oparams, sizeof(*oparams));
3598 if (IS_ERR(oparams)) {
3599 err = PTR_ERR(oparams);
3600 goto out;
3601 }
3602 snd_pcm_hw_convert_from_old_params(params, oparams);
3603 err = snd_pcm_hw_refine(substream, params);
3604 if (err < 0)
3605 goto out_old;
3606
3607 err = fixup_unreferenced_params(substream, params);
3608 if (err < 0)
3609 goto out_old;
3610
3611 snd_pcm_hw_convert_to_old_params(oparams, params);
3612 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3613 err = -EFAULT;
3614out_old:
3615 kfree(oparams);
3616out:
3617 kfree(params);
3618 return err;
3619}
3620
3621static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3622 struct snd_pcm_hw_params_old __user * _oparams)
3623{
3624 struct snd_pcm_hw_params *params;
3625 struct snd_pcm_hw_params_old *oparams = NULL;
3626 int err;
3627
3628 params = kmalloc(sizeof(*params), GFP_KERNEL);
3629 if (!params)
3630 return -ENOMEM;
3631
3632 oparams = memdup_user(_oparams, sizeof(*oparams));
3633 if (IS_ERR(oparams)) {
3634 err = PTR_ERR(oparams);
3635 goto out;
3636 }
3637
3638 snd_pcm_hw_convert_from_old_params(params, oparams);
3639 err = snd_pcm_hw_params(substream, params);
3640 if (err < 0)
3641 goto out_old;
3642
3643 snd_pcm_hw_convert_to_old_params(oparams, params);
3644 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3645 err = -EFAULT;
3646out_old:
3647 kfree(oparams);
3648out:
3649 kfree(params);
3650 return err;
3651}
3652#endif /* CONFIG_SND_SUPPORT_OLD_API */
3653
3654#ifndef CONFIG_MMU
3655static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3656 unsigned long addr,
3657 unsigned long len,
3658 unsigned long pgoff,
3659 unsigned long flags)
3660{
3661 struct snd_pcm_file *pcm_file = file->private_data;
3662 struct snd_pcm_substream *substream = pcm_file->substream;
3663 struct snd_pcm_runtime *runtime = substream->runtime;
3664 unsigned long offset = pgoff << PAGE_SHIFT;
3665
3666 switch (offset) {
3667 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3668 return (unsigned long)runtime->status;
3669 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3670 return (unsigned long)runtime->control;
3671 default:
3672 return (unsigned long)runtime->dma_area + offset;
3673 }
3674}
3675#else
3676# define snd_pcm_get_unmapped_area NULL
3677#endif
3678
3679/*
3680 * Register section
3681 */
3682
3683const struct file_operations snd_pcm_f_ops[2] = {
3684 {
3685 .owner = THIS_MODULE,
3686 .write = snd_pcm_write,
3687 .write_iter = snd_pcm_writev,
3688 .open = snd_pcm_playback_open,
3689 .release = snd_pcm_release,
3690 .llseek = no_llseek,
3691 .poll = snd_pcm_poll,
3692 .unlocked_ioctl = snd_pcm_ioctl,
3693 .compat_ioctl = snd_pcm_ioctl_compat,
3694 .mmap = snd_pcm_mmap,
3695 .fasync = snd_pcm_fasync,
3696 .get_unmapped_area = snd_pcm_get_unmapped_area,
3697 },
3698 {
3699 .owner = THIS_MODULE,
3700 .read = snd_pcm_read,
3701 .read_iter = snd_pcm_readv,
3702 .open = snd_pcm_capture_open,
3703 .release = snd_pcm_release,
3704 .llseek = no_llseek,
3705 .poll = snd_pcm_poll,
3706 .unlocked_ioctl = snd_pcm_ioctl,
3707 .compat_ioctl = snd_pcm_ioctl_compat,
3708 .mmap = snd_pcm_mmap,
3709 .fasync = snd_pcm_fasync,
3710 .get_unmapped_area = snd_pcm_get_unmapped_area,
3711 }
3712};
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/file.h>
24#include <linux/slab.h>
25#include <linux/time.h>
26#include <linux/pm_qos_params.h>
27#include <linux/uio.h>
28#include <linux/dma-mapping.h>
29#include <sound/core.h>
30#include <sound/control.h>
31#include <sound/info.h>
32#include <sound/pcm.h>
33#include <sound/pcm_params.h>
34#include <sound/timer.h>
35#include <sound/minors.h>
36#include <asm/io.h>
37#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
38#include <dma-coherence.h>
39#endif
40
41/*
42 * Compatibility
43 */
44
45struct snd_pcm_hw_params_old {
46 unsigned int flags;
47 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
48 SNDRV_PCM_HW_PARAM_ACCESS + 1];
49 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
50 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
51 unsigned int rmask;
52 unsigned int cmask;
53 unsigned int info;
54 unsigned int msbits;
55 unsigned int rate_num;
56 unsigned int rate_den;
57 snd_pcm_uframes_t fifo_size;
58 unsigned char reserved[64];
59};
60
61#ifdef CONFIG_SND_SUPPORT_OLD_API
62#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
63#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
64
65static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params_old __user * _oparams);
69#endif
70static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
71
72/*
73 *
74 */
75
76DEFINE_RWLOCK(snd_pcm_link_rwlock);
77EXPORT_SYMBOL(snd_pcm_link_rwlock);
78
79static DECLARE_RWSEM(snd_pcm_link_rwsem);
80
81static inline mm_segment_t snd_enter_user(void)
82{
83 mm_segment_t fs = get_fs();
84 set_fs(get_ds());
85 return fs;
86}
87
88static inline void snd_leave_user(mm_segment_t fs)
89{
90 set_fs(fs);
91}
92
93
94
95int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
96{
97 struct snd_pcm_runtime *runtime;
98 struct snd_pcm *pcm = substream->pcm;
99 struct snd_pcm_str *pstr = substream->pstr;
100
101 memset(info, 0, sizeof(*info));
102 info->card = pcm->card->number;
103 info->device = pcm->device;
104 info->stream = substream->stream;
105 info->subdevice = substream->number;
106 strlcpy(info->id, pcm->id, sizeof(info->id));
107 strlcpy(info->name, pcm->name, sizeof(info->name));
108 info->dev_class = pcm->dev_class;
109 info->dev_subclass = pcm->dev_subclass;
110 info->subdevices_count = pstr->substream_count;
111 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
112 strlcpy(info->subname, substream->name, sizeof(info->subname));
113 runtime = substream->runtime;
114 /* AB: FIXME!!! This is definitely nonsense */
115 if (runtime) {
116 info->sync = runtime->sync;
117 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
118 }
119 return 0;
120}
121
122int snd_pcm_info_user(struct snd_pcm_substream *substream,
123 struct snd_pcm_info __user * _info)
124{
125 struct snd_pcm_info *info;
126 int err;
127
128 info = kmalloc(sizeof(*info), GFP_KERNEL);
129 if (! info)
130 return -ENOMEM;
131 err = snd_pcm_info(substream, info);
132 if (err >= 0) {
133 if (copy_to_user(_info, info, sizeof(*info)))
134 err = -EFAULT;
135 }
136 kfree(info);
137 return err;
138}
139
140#undef RULES_DEBUG
141
142#ifdef RULES_DEBUG
143#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
144static const char * const snd_pcm_hw_param_names[] = {
145 HW_PARAM(ACCESS),
146 HW_PARAM(FORMAT),
147 HW_PARAM(SUBFORMAT),
148 HW_PARAM(SAMPLE_BITS),
149 HW_PARAM(FRAME_BITS),
150 HW_PARAM(CHANNELS),
151 HW_PARAM(RATE),
152 HW_PARAM(PERIOD_TIME),
153 HW_PARAM(PERIOD_SIZE),
154 HW_PARAM(PERIOD_BYTES),
155 HW_PARAM(PERIODS),
156 HW_PARAM(BUFFER_TIME),
157 HW_PARAM(BUFFER_SIZE),
158 HW_PARAM(BUFFER_BYTES),
159 HW_PARAM(TICK_TIME),
160};
161#endif
162
163int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
164 struct snd_pcm_hw_params *params)
165{
166 unsigned int k;
167 struct snd_pcm_hardware *hw;
168 struct snd_interval *i = NULL;
169 struct snd_mask *m = NULL;
170 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
171 unsigned int rstamps[constrs->rules_num];
172 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
173 unsigned int stamp = 2;
174 int changed, again;
175
176 params->info = 0;
177 params->fifo_size = 0;
178 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
179 params->msbits = 0;
180 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
181 params->rate_num = 0;
182 params->rate_den = 0;
183 }
184
185 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
186 m = hw_param_mask(params, k);
187 if (snd_mask_empty(m))
188 return -EINVAL;
189 if (!(params->rmask & (1 << k)))
190 continue;
191#ifdef RULES_DEBUG
192 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
193 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
194#endif
195 changed = snd_mask_refine(m, constrs_mask(constrs, k));
196#ifdef RULES_DEBUG
197 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
198#endif
199 if (changed)
200 params->cmask |= 1 << k;
201 if (changed < 0)
202 return changed;
203 }
204
205 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
206 i = hw_param_interval(params, k);
207 if (snd_interval_empty(i))
208 return -EINVAL;
209 if (!(params->rmask & (1 << k)))
210 continue;
211#ifdef RULES_DEBUG
212 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
213 if (i->empty)
214 printk("empty");
215 else
216 printk("%c%u %u%c",
217 i->openmin ? '(' : '[', i->min,
218 i->max, i->openmax ? ')' : ']');
219 printk(" -> ");
220#endif
221 changed = snd_interval_refine(i, constrs_interval(constrs, k));
222#ifdef RULES_DEBUG
223 if (i->empty)
224 printk("empty\n");
225 else
226 printk("%c%u %u%c\n",
227 i->openmin ? '(' : '[', i->min,
228 i->max, i->openmax ? ')' : ']');
229#endif
230 if (changed)
231 params->cmask |= 1 << k;
232 if (changed < 0)
233 return changed;
234 }
235
236 for (k = 0; k < constrs->rules_num; k++)
237 rstamps[k] = 0;
238 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
239 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
240 do {
241 again = 0;
242 for (k = 0; k < constrs->rules_num; k++) {
243 struct snd_pcm_hw_rule *r = &constrs->rules[k];
244 unsigned int d;
245 int doit = 0;
246 if (r->cond && !(r->cond & params->flags))
247 continue;
248 for (d = 0; r->deps[d] >= 0; d++) {
249 if (vstamps[r->deps[d]] > rstamps[k]) {
250 doit = 1;
251 break;
252 }
253 }
254 if (!doit)
255 continue;
256#ifdef RULES_DEBUG
257 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
258 if (r->var >= 0) {
259 printk("%s = ", snd_pcm_hw_param_names[r->var]);
260 if (hw_is_mask(r->var)) {
261 m = hw_param_mask(params, r->var);
262 printk("%x", *m->bits);
263 } else {
264 i = hw_param_interval(params, r->var);
265 if (i->empty)
266 printk("empty");
267 else
268 printk("%c%u %u%c",
269 i->openmin ? '(' : '[', i->min,
270 i->max, i->openmax ? ')' : ']');
271 }
272 }
273#endif
274 changed = r->func(params, r);
275#ifdef RULES_DEBUG
276 if (r->var >= 0) {
277 printk(" -> ");
278 if (hw_is_mask(r->var))
279 printk("%x", *m->bits);
280 else {
281 if (i->empty)
282 printk("empty");
283 else
284 printk("%c%u %u%c",
285 i->openmin ? '(' : '[', i->min,
286 i->max, i->openmax ? ')' : ']');
287 }
288 }
289 printk("\n");
290#endif
291 rstamps[k] = stamp;
292 if (changed && r->var >= 0) {
293 params->cmask |= (1 << r->var);
294 vstamps[r->var] = stamp;
295 again = 1;
296 }
297 if (changed < 0)
298 return changed;
299 stamp++;
300 }
301 } while (again);
302 if (!params->msbits) {
303 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
304 if (snd_interval_single(i))
305 params->msbits = snd_interval_value(i);
306 }
307
308 if (!params->rate_den) {
309 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
310 if (snd_interval_single(i)) {
311 params->rate_num = snd_interval_value(i);
312 params->rate_den = 1;
313 }
314 }
315
316 hw = &substream->runtime->hw;
317 if (!params->info)
318 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
319 if (!params->fifo_size) {
320 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
321 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
322 if (snd_mask_min(m) == snd_mask_max(m) &&
323 snd_interval_min(i) == snd_interval_max(i)) {
324 changed = substream->ops->ioctl(substream,
325 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
326 if (changed < 0)
327 return changed;
328 }
329 }
330 params->rmask = 0;
331 return 0;
332}
333
334EXPORT_SYMBOL(snd_pcm_hw_refine);
335
336static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
337 struct snd_pcm_hw_params __user * _params)
338{
339 struct snd_pcm_hw_params *params;
340 int err;
341
342 params = memdup_user(_params, sizeof(*params));
343 if (IS_ERR(params))
344 return PTR_ERR(params);
345
346 err = snd_pcm_hw_refine(substream, params);
347 if (copy_to_user(_params, params, sizeof(*params))) {
348 if (!err)
349 err = -EFAULT;
350 }
351
352 kfree(params);
353 return err;
354}
355
356static int period_to_usecs(struct snd_pcm_runtime *runtime)
357{
358 int usecs;
359
360 if (! runtime->rate)
361 return -1; /* invalid */
362
363 /* take 75% of period time as the deadline */
364 usecs = (750000 / runtime->rate) * runtime->period_size;
365 usecs += ((750000 % runtime->rate) * runtime->period_size) /
366 runtime->rate;
367
368 return usecs;
369}
370
371static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
372 struct snd_pcm_hw_params *params)
373{
374 struct snd_pcm_runtime *runtime;
375 int err, usecs;
376 unsigned int bits;
377 snd_pcm_uframes_t frames;
378
379 if (PCM_RUNTIME_CHECK(substream))
380 return -ENXIO;
381 runtime = substream->runtime;
382 snd_pcm_stream_lock_irq(substream);
383 switch (runtime->status->state) {
384 case SNDRV_PCM_STATE_OPEN:
385 case SNDRV_PCM_STATE_SETUP:
386 case SNDRV_PCM_STATE_PREPARED:
387 break;
388 default:
389 snd_pcm_stream_unlock_irq(substream);
390 return -EBADFD;
391 }
392 snd_pcm_stream_unlock_irq(substream);
393#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394 if (!substream->oss.oss)
395#endif
396 if (atomic_read(&substream->mmap_count))
397 return -EBADFD;
398
399 params->rmask = ~0U;
400 err = snd_pcm_hw_refine(substream, params);
401 if (err < 0)
402 goto _error;
403
404 err = snd_pcm_hw_params_choose(substream, params);
405 if (err < 0)
406 goto _error;
407
408 if (substream->ops->hw_params != NULL) {
409 err = substream->ops->hw_params(substream, params);
410 if (err < 0)
411 goto _error;
412 }
413
414 runtime->access = params_access(params);
415 runtime->format = params_format(params);
416 runtime->subformat = params_subformat(params);
417 runtime->channels = params_channels(params);
418 runtime->rate = params_rate(params);
419 runtime->period_size = params_period_size(params);
420 runtime->periods = params_periods(params);
421 runtime->buffer_size = params_buffer_size(params);
422 runtime->info = params->info;
423 runtime->rate_num = params->rate_num;
424 runtime->rate_den = params->rate_den;
425 runtime->no_period_wakeup =
426 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
427 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
428
429 bits = snd_pcm_format_physical_width(runtime->format);
430 runtime->sample_bits = bits;
431 bits *= runtime->channels;
432 runtime->frame_bits = bits;
433 frames = 1;
434 while (bits % 8 != 0) {
435 bits *= 2;
436 frames *= 2;
437 }
438 runtime->byte_align = bits / 8;
439 runtime->min_align = frames;
440
441 /* Default sw params */
442 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
443 runtime->period_step = 1;
444 runtime->control->avail_min = runtime->period_size;
445 runtime->start_threshold = 1;
446 runtime->stop_threshold = runtime->buffer_size;
447 runtime->silence_threshold = 0;
448 runtime->silence_size = 0;
449 runtime->boundary = runtime->buffer_size;
450 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
451 runtime->boundary *= 2;
452
453 snd_pcm_timer_resolution_change(substream);
454 runtime->status->state = SNDRV_PCM_STATE_SETUP;
455
456 if (pm_qos_request_active(&substream->latency_pm_qos_req))
457 pm_qos_remove_request(&substream->latency_pm_qos_req);
458 if ((usecs = period_to_usecs(runtime)) >= 0)
459 pm_qos_add_request(&substream->latency_pm_qos_req,
460 PM_QOS_CPU_DMA_LATENCY, usecs);
461 return 0;
462 _error:
463 /* hardware might be unusable from this time,
464 so we force application to retry to set
465 the correct hardware parameter settings */
466 runtime->status->state = SNDRV_PCM_STATE_OPEN;
467 if (substream->ops->hw_free != NULL)
468 substream->ops->hw_free(substream);
469 return err;
470}
471
472static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
473 struct snd_pcm_hw_params __user * _params)
474{
475 struct snd_pcm_hw_params *params;
476 int err;
477
478 params = memdup_user(_params, sizeof(*params));
479 if (IS_ERR(params))
480 return PTR_ERR(params);
481
482 err = snd_pcm_hw_params(substream, params);
483 if (copy_to_user(_params, params, sizeof(*params))) {
484 if (!err)
485 err = -EFAULT;
486 }
487
488 kfree(params);
489 return err;
490}
491
492static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
493{
494 struct snd_pcm_runtime *runtime;
495 int result = 0;
496
497 if (PCM_RUNTIME_CHECK(substream))
498 return -ENXIO;
499 runtime = substream->runtime;
500 snd_pcm_stream_lock_irq(substream);
501 switch (runtime->status->state) {
502 case SNDRV_PCM_STATE_SETUP:
503 case SNDRV_PCM_STATE_PREPARED:
504 break;
505 default:
506 snd_pcm_stream_unlock_irq(substream);
507 return -EBADFD;
508 }
509 snd_pcm_stream_unlock_irq(substream);
510 if (atomic_read(&substream->mmap_count))
511 return -EBADFD;
512 if (substream->ops->hw_free)
513 result = substream->ops->hw_free(substream);
514 runtime->status->state = SNDRV_PCM_STATE_OPEN;
515 pm_qos_remove_request(&substream->latency_pm_qos_req);
516 return result;
517}
518
519static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
520 struct snd_pcm_sw_params *params)
521{
522 struct snd_pcm_runtime *runtime;
523 int err;
524
525 if (PCM_RUNTIME_CHECK(substream))
526 return -ENXIO;
527 runtime = substream->runtime;
528 snd_pcm_stream_lock_irq(substream);
529 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
530 snd_pcm_stream_unlock_irq(substream);
531 return -EBADFD;
532 }
533 snd_pcm_stream_unlock_irq(substream);
534
535 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
536 return -EINVAL;
537 if (params->avail_min == 0)
538 return -EINVAL;
539 if (params->silence_size >= runtime->boundary) {
540 if (params->silence_threshold != 0)
541 return -EINVAL;
542 } else {
543 if (params->silence_size > params->silence_threshold)
544 return -EINVAL;
545 if (params->silence_threshold > runtime->buffer_size)
546 return -EINVAL;
547 }
548 err = 0;
549 snd_pcm_stream_lock_irq(substream);
550 runtime->tstamp_mode = params->tstamp_mode;
551 runtime->period_step = params->period_step;
552 runtime->control->avail_min = params->avail_min;
553 runtime->start_threshold = params->start_threshold;
554 runtime->stop_threshold = params->stop_threshold;
555 runtime->silence_threshold = params->silence_threshold;
556 runtime->silence_size = params->silence_size;
557 params->boundary = runtime->boundary;
558 if (snd_pcm_running(substream)) {
559 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
560 runtime->silence_size > 0)
561 snd_pcm_playback_silence(substream, ULONG_MAX);
562 err = snd_pcm_update_state(substream, runtime);
563 }
564 snd_pcm_stream_unlock_irq(substream);
565 return err;
566}
567
568static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
569 struct snd_pcm_sw_params __user * _params)
570{
571 struct snd_pcm_sw_params params;
572 int err;
573 if (copy_from_user(¶ms, _params, sizeof(params)))
574 return -EFAULT;
575 err = snd_pcm_sw_params(substream, ¶ms);
576 if (copy_to_user(_params, ¶ms, sizeof(params)))
577 return -EFAULT;
578 return err;
579}
580
581int snd_pcm_status(struct snd_pcm_substream *substream,
582 struct snd_pcm_status *status)
583{
584 struct snd_pcm_runtime *runtime = substream->runtime;
585
586 snd_pcm_stream_lock_irq(substream);
587 status->state = runtime->status->state;
588 status->suspended_state = runtime->status->suspended_state;
589 if (status->state == SNDRV_PCM_STATE_OPEN)
590 goto _end;
591 status->trigger_tstamp = runtime->trigger_tstamp;
592 if (snd_pcm_running(substream)) {
593 snd_pcm_update_hw_ptr(substream);
594 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
595 status->tstamp = runtime->status->tstamp;
596 goto _tstamp_end;
597 }
598 }
599 snd_pcm_gettime(runtime, &status->tstamp);
600 _tstamp_end:
601 status->appl_ptr = runtime->control->appl_ptr;
602 status->hw_ptr = runtime->status->hw_ptr;
603 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
604 status->avail = snd_pcm_playback_avail(runtime);
605 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
606 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
607 status->delay = runtime->buffer_size - status->avail;
608 status->delay += runtime->delay;
609 } else
610 status->delay = 0;
611 } else {
612 status->avail = snd_pcm_capture_avail(runtime);
613 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
614 status->delay = status->avail + runtime->delay;
615 else
616 status->delay = 0;
617 }
618 status->avail_max = runtime->avail_max;
619 status->overrange = runtime->overrange;
620 runtime->avail_max = 0;
621 runtime->overrange = 0;
622 _end:
623 snd_pcm_stream_unlock_irq(substream);
624 return 0;
625}
626
627static int snd_pcm_status_user(struct snd_pcm_substream *substream,
628 struct snd_pcm_status __user * _status)
629{
630 struct snd_pcm_status status;
631 int res;
632
633 memset(&status, 0, sizeof(status));
634 res = snd_pcm_status(substream, &status);
635 if (res < 0)
636 return res;
637 if (copy_to_user(_status, &status, sizeof(status)))
638 return -EFAULT;
639 return 0;
640}
641
642static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
643 struct snd_pcm_channel_info * info)
644{
645 struct snd_pcm_runtime *runtime;
646 unsigned int channel;
647
648 channel = info->channel;
649 runtime = substream->runtime;
650 snd_pcm_stream_lock_irq(substream);
651 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
652 snd_pcm_stream_unlock_irq(substream);
653 return -EBADFD;
654 }
655 snd_pcm_stream_unlock_irq(substream);
656 if (channel >= runtime->channels)
657 return -EINVAL;
658 memset(info, 0, sizeof(*info));
659 info->channel = channel;
660 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
661}
662
663static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
664 struct snd_pcm_channel_info __user * _info)
665{
666 struct snd_pcm_channel_info info;
667 int res;
668
669 if (copy_from_user(&info, _info, sizeof(info)))
670 return -EFAULT;
671 res = snd_pcm_channel_info(substream, &info);
672 if (res < 0)
673 return res;
674 if (copy_to_user(_info, &info, sizeof(info)))
675 return -EFAULT;
676 return 0;
677}
678
679static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
680{
681 struct snd_pcm_runtime *runtime = substream->runtime;
682 if (runtime->trigger_master == NULL)
683 return;
684 if (runtime->trigger_master == substream) {
685 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
686 } else {
687 snd_pcm_trigger_tstamp(runtime->trigger_master);
688 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
689 }
690 runtime->trigger_master = NULL;
691}
692
693struct action_ops {
694 int (*pre_action)(struct snd_pcm_substream *substream, int state);
695 int (*do_action)(struct snd_pcm_substream *substream, int state);
696 void (*undo_action)(struct snd_pcm_substream *substream, int state);
697 void (*post_action)(struct snd_pcm_substream *substream, int state);
698};
699
700/*
701 * this functions is core for handling of linked stream
702 * Note: the stream state might be changed also on failure
703 * Note2: call with calling stream lock + link lock
704 */
705static int snd_pcm_action_group(struct action_ops *ops,
706 struct snd_pcm_substream *substream,
707 int state, int do_lock)
708{
709 struct snd_pcm_substream *s = NULL;
710 struct snd_pcm_substream *s1;
711 int res = 0;
712
713 snd_pcm_group_for_each_entry(s, substream) {
714 if (do_lock && s != substream)
715 spin_lock_nested(&s->self_group.lock,
716 SINGLE_DEPTH_NESTING);
717 res = ops->pre_action(s, state);
718 if (res < 0)
719 goto _unlock;
720 }
721 snd_pcm_group_for_each_entry(s, substream) {
722 res = ops->do_action(s, state);
723 if (res < 0) {
724 if (ops->undo_action) {
725 snd_pcm_group_for_each_entry(s1, substream) {
726 if (s1 == s) /* failed stream */
727 break;
728 ops->undo_action(s1, state);
729 }
730 }
731 s = NULL; /* unlock all */
732 goto _unlock;
733 }
734 }
735 snd_pcm_group_for_each_entry(s, substream) {
736 ops->post_action(s, state);
737 }
738 _unlock:
739 if (do_lock) {
740 /* unlock streams */
741 snd_pcm_group_for_each_entry(s1, substream) {
742 if (s1 != substream)
743 spin_unlock(&s1->self_group.lock);
744 if (s1 == s) /* end */
745 break;
746 }
747 }
748 return res;
749}
750
751/*
752 * Note: call with stream lock
753 */
754static int snd_pcm_action_single(struct action_ops *ops,
755 struct snd_pcm_substream *substream,
756 int state)
757{
758 int res;
759
760 res = ops->pre_action(substream, state);
761 if (res < 0)
762 return res;
763 res = ops->do_action(substream, state);
764 if (res == 0)
765 ops->post_action(substream, state);
766 else if (ops->undo_action)
767 ops->undo_action(substream, state);
768 return res;
769}
770
771/*
772 * Note: call with stream lock
773 */
774static int snd_pcm_action(struct action_ops *ops,
775 struct snd_pcm_substream *substream,
776 int state)
777{
778 int res;
779
780 if (snd_pcm_stream_linked(substream)) {
781 if (!spin_trylock(&substream->group->lock)) {
782 spin_unlock(&substream->self_group.lock);
783 spin_lock(&substream->group->lock);
784 spin_lock(&substream->self_group.lock);
785 }
786 res = snd_pcm_action_group(ops, substream, state, 1);
787 spin_unlock(&substream->group->lock);
788 } else {
789 res = snd_pcm_action_single(ops, substream, state);
790 }
791 return res;
792}
793
794/*
795 * Note: don't use any locks before
796 */
797static int snd_pcm_action_lock_irq(struct action_ops *ops,
798 struct snd_pcm_substream *substream,
799 int state)
800{
801 int res;
802
803 read_lock_irq(&snd_pcm_link_rwlock);
804 if (snd_pcm_stream_linked(substream)) {
805 spin_lock(&substream->group->lock);
806 spin_lock(&substream->self_group.lock);
807 res = snd_pcm_action_group(ops, substream, state, 1);
808 spin_unlock(&substream->self_group.lock);
809 spin_unlock(&substream->group->lock);
810 } else {
811 spin_lock(&substream->self_group.lock);
812 res = snd_pcm_action_single(ops, substream, state);
813 spin_unlock(&substream->self_group.lock);
814 }
815 read_unlock_irq(&snd_pcm_link_rwlock);
816 return res;
817}
818
819/*
820 */
821static int snd_pcm_action_nonatomic(struct action_ops *ops,
822 struct snd_pcm_substream *substream,
823 int state)
824{
825 int res;
826
827 down_read(&snd_pcm_link_rwsem);
828 if (snd_pcm_stream_linked(substream))
829 res = snd_pcm_action_group(ops, substream, state, 0);
830 else
831 res = snd_pcm_action_single(ops, substream, state);
832 up_read(&snd_pcm_link_rwsem);
833 return res;
834}
835
836/*
837 * start callbacks
838 */
839static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
840{
841 struct snd_pcm_runtime *runtime = substream->runtime;
842 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
843 return -EBADFD;
844 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
845 !snd_pcm_playback_data(substream))
846 return -EPIPE;
847 runtime->trigger_master = substream;
848 return 0;
849}
850
851static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
852{
853 if (substream->runtime->trigger_master != substream)
854 return 0;
855 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
856}
857
858static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
859{
860 if (substream->runtime->trigger_master == substream)
861 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
862}
863
864static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
865{
866 struct snd_pcm_runtime *runtime = substream->runtime;
867 snd_pcm_trigger_tstamp(substream);
868 runtime->hw_ptr_jiffies = jiffies;
869 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
870 runtime->rate;
871 runtime->status->state = state;
872 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
873 runtime->silence_size > 0)
874 snd_pcm_playback_silence(substream, ULONG_MAX);
875 if (substream->timer)
876 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
877 &runtime->trigger_tstamp);
878}
879
880static struct action_ops snd_pcm_action_start = {
881 .pre_action = snd_pcm_pre_start,
882 .do_action = snd_pcm_do_start,
883 .undo_action = snd_pcm_undo_start,
884 .post_action = snd_pcm_post_start
885};
886
887/**
888 * snd_pcm_start - start all linked streams
889 * @substream: the PCM substream instance
890 */
891int snd_pcm_start(struct snd_pcm_substream *substream)
892{
893 return snd_pcm_action(&snd_pcm_action_start, substream,
894 SNDRV_PCM_STATE_RUNNING);
895}
896
897/*
898 * stop callbacks
899 */
900static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
901{
902 struct snd_pcm_runtime *runtime = substream->runtime;
903 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
904 return -EBADFD;
905 runtime->trigger_master = substream;
906 return 0;
907}
908
909static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
910{
911 if (substream->runtime->trigger_master == substream &&
912 snd_pcm_running(substream))
913 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
914 return 0; /* unconditonally stop all substreams */
915}
916
917static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
918{
919 struct snd_pcm_runtime *runtime = substream->runtime;
920 if (runtime->status->state != state) {
921 snd_pcm_trigger_tstamp(substream);
922 if (substream->timer)
923 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
924 &runtime->trigger_tstamp);
925 runtime->status->state = state;
926 }
927 wake_up(&runtime->sleep);
928 wake_up(&runtime->tsleep);
929}
930
931static struct action_ops snd_pcm_action_stop = {
932 .pre_action = snd_pcm_pre_stop,
933 .do_action = snd_pcm_do_stop,
934 .post_action = snd_pcm_post_stop
935};
936
937/**
938 * snd_pcm_stop - try to stop all running streams in the substream group
939 * @substream: the PCM substream instance
940 * @state: PCM state after stopping the stream
941 *
942 * The state of each stream is then changed to the given state unconditionally.
943 */
944int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
945{
946 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
947}
948
949EXPORT_SYMBOL(snd_pcm_stop);
950
951/**
952 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
953 * @substream: the PCM substream
954 *
955 * After stopping, the state is changed to SETUP.
956 * Unlike snd_pcm_stop(), this affects only the given stream.
957 */
958int snd_pcm_drain_done(struct snd_pcm_substream *substream)
959{
960 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
961 SNDRV_PCM_STATE_SETUP);
962}
963
964/*
965 * pause callbacks
966 */
967static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
968{
969 struct snd_pcm_runtime *runtime = substream->runtime;
970 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
971 return -ENOSYS;
972 if (push) {
973 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
974 return -EBADFD;
975 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
976 return -EBADFD;
977 runtime->trigger_master = substream;
978 return 0;
979}
980
981static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
982{
983 if (substream->runtime->trigger_master != substream)
984 return 0;
985 /* some drivers might use hw_ptr to recover from the pause -
986 update the hw_ptr now */
987 if (push)
988 snd_pcm_update_hw_ptr(substream);
989 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
990 * a delta between the current jiffies, this gives a large enough
991 * delta, effectively to skip the check once.
992 */
993 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
994 return substream->ops->trigger(substream,
995 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
996 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
997}
998
999static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1000{
1001 if (substream->runtime->trigger_master == substream)
1002 substream->ops->trigger(substream,
1003 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1004 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1005}
1006
1007static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1008{
1009 struct snd_pcm_runtime *runtime = substream->runtime;
1010 snd_pcm_trigger_tstamp(substream);
1011 if (push) {
1012 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1013 if (substream->timer)
1014 snd_timer_notify(substream->timer,
1015 SNDRV_TIMER_EVENT_MPAUSE,
1016 &runtime->trigger_tstamp);
1017 wake_up(&runtime->sleep);
1018 wake_up(&runtime->tsleep);
1019 } else {
1020 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1021 if (substream->timer)
1022 snd_timer_notify(substream->timer,
1023 SNDRV_TIMER_EVENT_MCONTINUE,
1024 &runtime->trigger_tstamp);
1025 }
1026}
1027
1028static struct action_ops snd_pcm_action_pause = {
1029 .pre_action = snd_pcm_pre_pause,
1030 .do_action = snd_pcm_do_pause,
1031 .undo_action = snd_pcm_undo_pause,
1032 .post_action = snd_pcm_post_pause
1033};
1034
1035/*
1036 * Push/release the pause for all linked streams.
1037 */
1038static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1039{
1040 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1041}
1042
1043#ifdef CONFIG_PM
1044/* suspend */
1045
1046static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1047{
1048 struct snd_pcm_runtime *runtime = substream->runtime;
1049 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1050 return -EBUSY;
1051 runtime->trigger_master = substream;
1052 return 0;
1053}
1054
1055static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1056{
1057 struct snd_pcm_runtime *runtime = substream->runtime;
1058 if (runtime->trigger_master != substream)
1059 return 0;
1060 if (! snd_pcm_running(substream))
1061 return 0;
1062 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1063 return 0; /* suspend unconditionally */
1064}
1065
1066static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1067{
1068 struct snd_pcm_runtime *runtime = substream->runtime;
1069 snd_pcm_trigger_tstamp(substream);
1070 if (substream->timer)
1071 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1072 &runtime->trigger_tstamp);
1073 runtime->status->suspended_state = runtime->status->state;
1074 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1075 wake_up(&runtime->sleep);
1076 wake_up(&runtime->tsleep);
1077}
1078
1079static struct action_ops snd_pcm_action_suspend = {
1080 .pre_action = snd_pcm_pre_suspend,
1081 .do_action = snd_pcm_do_suspend,
1082 .post_action = snd_pcm_post_suspend
1083};
1084
1085/**
1086 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1087 * @substream: the PCM substream
1088 *
1089 * After this call, all streams are changed to SUSPENDED state.
1090 */
1091int snd_pcm_suspend(struct snd_pcm_substream *substream)
1092{
1093 int err;
1094 unsigned long flags;
1095
1096 if (! substream)
1097 return 0;
1098
1099 snd_pcm_stream_lock_irqsave(substream, flags);
1100 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1101 snd_pcm_stream_unlock_irqrestore(substream, flags);
1102 return err;
1103}
1104
1105EXPORT_SYMBOL(snd_pcm_suspend);
1106
1107/**
1108 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1109 * @pcm: the PCM instance
1110 *
1111 * After this call, all streams are changed to SUSPENDED state.
1112 */
1113int snd_pcm_suspend_all(struct snd_pcm *pcm)
1114{
1115 struct snd_pcm_substream *substream;
1116 int stream, err = 0;
1117
1118 if (! pcm)
1119 return 0;
1120
1121 for (stream = 0; stream < 2; stream++) {
1122 for (substream = pcm->streams[stream].substream;
1123 substream; substream = substream->next) {
1124 /* FIXME: the open/close code should lock this as well */
1125 if (substream->runtime == NULL)
1126 continue;
1127 err = snd_pcm_suspend(substream);
1128 if (err < 0 && err != -EBUSY)
1129 return err;
1130 }
1131 }
1132 return 0;
1133}
1134
1135EXPORT_SYMBOL(snd_pcm_suspend_all);
1136
1137/* resume */
1138
1139static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1140{
1141 struct snd_pcm_runtime *runtime = substream->runtime;
1142 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1143 return -ENOSYS;
1144 runtime->trigger_master = substream;
1145 return 0;
1146}
1147
1148static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1149{
1150 struct snd_pcm_runtime *runtime = substream->runtime;
1151 if (runtime->trigger_master != substream)
1152 return 0;
1153 /* DMA not running previously? */
1154 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1155 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1156 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1157 return 0;
1158 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1159}
1160
1161static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1162{
1163 if (substream->runtime->trigger_master == substream &&
1164 snd_pcm_running(substream))
1165 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1166}
1167
1168static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1169{
1170 struct snd_pcm_runtime *runtime = substream->runtime;
1171 snd_pcm_trigger_tstamp(substream);
1172 if (substream->timer)
1173 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1174 &runtime->trigger_tstamp);
1175 runtime->status->state = runtime->status->suspended_state;
1176}
1177
1178static struct action_ops snd_pcm_action_resume = {
1179 .pre_action = snd_pcm_pre_resume,
1180 .do_action = snd_pcm_do_resume,
1181 .undo_action = snd_pcm_undo_resume,
1182 .post_action = snd_pcm_post_resume
1183};
1184
1185static int snd_pcm_resume(struct snd_pcm_substream *substream)
1186{
1187 struct snd_card *card = substream->pcm->card;
1188 int res;
1189
1190 snd_power_lock(card);
1191 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1192 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1193 snd_power_unlock(card);
1194 return res;
1195}
1196
1197#else
1198
1199static int snd_pcm_resume(struct snd_pcm_substream *substream)
1200{
1201 return -ENOSYS;
1202}
1203
1204#endif /* CONFIG_PM */
1205
1206/*
1207 * xrun ioctl
1208 *
1209 * Change the RUNNING stream(s) to XRUN state.
1210 */
1211static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1212{
1213 struct snd_card *card = substream->pcm->card;
1214 struct snd_pcm_runtime *runtime = substream->runtime;
1215 int result;
1216
1217 snd_power_lock(card);
1218 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1219 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1220 if (result < 0)
1221 goto _unlock;
1222 }
1223
1224 snd_pcm_stream_lock_irq(substream);
1225 switch (runtime->status->state) {
1226 case SNDRV_PCM_STATE_XRUN:
1227 result = 0; /* already there */
1228 break;
1229 case SNDRV_PCM_STATE_RUNNING:
1230 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1231 break;
1232 default:
1233 result = -EBADFD;
1234 }
1235 snd_pcm_stream_unlock_irq(substream);
1236 _unlock:
1237 snd_power_unlock(card);
1238 return result;
1239}
1240
1241/*
1242 * reset ioctl
1243 */
1244static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1245{
1246 struct snd_pcm_runtime *runtime = substream->runtime;
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_RUNNING:
1249 case SNDRV_PCM_STATE_PREPARED:
1250 case SNDRV_PCM_STATE_PAUSED:
1251 case SNDRV_PCM_STATE_SUSPENDED:
1252 return 0;
1253 default:
1254 return -EBADFD;
1255 }
1256}
1257
1258static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1259{
1260 struct snd_pcm_runtime *runtime = substream->runtime;
1261 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1262 if (err < 0)
1263 return err;
1264 runtime->hw_ptr_base = 0;
1265 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1266 runtime->status->hw_ptr % runtime->period_size;
1267 runtime->silence_start = runtime->status->hw_ptr;
1268 runtime->silence_filled = 0;
1269 return 0;
1270}
1271
1272static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1273{
1274 struct snd_pcm_runtime *runtime = substream->runtime;
1275 runtime->control->appl_ptr = runtime->status->hw_ptr;
1276 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1277 runtime->silence_size > 0)
1278 snd_pcm_playback_silence(substream, ULONG_MAX);
1279}
1280
1281static struct action_ops snd_pcm_action_reset = {
1282 .pre_action = snd_pcm_pre_reset,
1283 .do_action = snd_pcm_do_reset,
1284 .post_action = snd_pcm_post_reset
1285};
1286
1287static int snd_pcm_reset(struct snd_pcm_substream *substream)
1288{
1289 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1290}
1291
1292/*
1293 * prepare ioctl
1294 */
1295/* we use the second argument for updating f_flags */
1296static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1297 int f_flags)
1298{
1299 struct snd_pcm_runtime *runtime = substream->runtime;
1300 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1301 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1302 return -EBADFD;
1303 if (snd_pcm_running(substream))
1304 return -EBUSY;
1305 substream->f_flags = f_flags;
1306 return 0;
1307}
1308
1309static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1310{
1311 int err;
1312 err = substream->ops->prepare(substream);
1313 if (err < 0)
1314 return err;
1315 return snd_pcm_do_reset(substream, 0);
1316}
1317
1318static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1319{
1320 struct snd_pcm_runtime *runtime = substream->runtime;
1321 runtime->control->appl_ptr = runtime->status->hw_ptr;
1322 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1323}
1324
1325static struct action_ops snd_pcm_action_prepare = {
1326 .pre_action = snd_pcm_pre_prepare,
1327 .do_action = snd_pcm_do_prepare,
1328 .post_action = snd_pcm_post_prepare
1329};
1330
1331/**
1332 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1333 * @substream: the PCM substream instance
1334 * @file: file to refer f_flags
1335 */
1336static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1337 struct file *file)
1338{
1339 int res;
1340 struct snd_card *card = substream->pcm->card;
1341 int f_flags;
1342
1343 if (file)
1344 f_flags = file->f_flags;
1345 else
1346 f_flags = substream->f_flags;
1347
1348 snd_power_lock(card);
1349 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1350 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1351 substream, f_flags);
1352 snd_power_unlock(card);
1353 return res;
1354}
1355
1356/*
1357 * drain ioctl
1358 */
1359
1360static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1361{
1362 substream->runtime->trigger_master = substream;
1363 return 0;
1364}
1365
1366static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1367{
1368 struct snd_pcm_runtime *runtime = substream->runtime;
1369 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1370 switch (runtime->status->state) {
1371 case SNDRV_PCM_STATE_PREPARED:
1372 /* start playback stream if possible */
1373 if (! snd_pcm_playback_empty(substream)) {
1374 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1375 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1376 }
1377 break;
1378 case SNDRV_PCM_STATE_RUNNING:
1379 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1380 break;
1381 default:
1382 break;
1383 }
1384 } else {
1385 /* stop running stream */
1386 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1387 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1388 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1389 snd_pcm_do_stop(substream, new_state);
1390 snd_pcm_post_stop(substream, new_state);
1391 }
1392 }
1393 return 0;
1394}
1395
1396static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1397{
1398}
1399
1400static struct action_ops snd_pcm_action_drain_init = {
1401 .pre_action = snd_pcm_pre_drain_init,
1402 .do_action = snd_pcm_do_drain_init,
1403 .post_action = snd_pcm_post_drain_init
1404};
1405
1406static int snd_pcm_drop(struct snd_pcm_substream *substream);
1407
1408/*
1409 * Drain the stream(s).
1410 * When the substream is linked, sync until the draining of all playback streams
1411 * is finished.
1412 * After this call, all streams are supposed to be either SETUP or DRAINING
1413 * (capture only) state.
1414 */
1415static int snd_pcm_drain(struct snd_pcm_substream *substream,
1416 struct file *file)
1417{
1418 struct snd_card *card;
1419 struct snd_pcm_runtime *runtime;
1420 struct snd_pcm_substream *s;
1421 wait_queue_t wait;
1422 int result = 0;
1423 int nonblock = 0;
1424
1425 card = substream->pcm->card;
1426 runtime = substream->runtime;
1427
1428 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1429 return -EBADFD;
1430
1431 snd_power_lock(card);
1432 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1433 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1434 if (result < 0) {
1435 snd_power_unlock(card);
1436 return result;
1437 }
1438 }
1439
1440 if (file) {
1441 if (file->f_flags & O_NONBLOCK)
1442 nonblock = 1;
1443 } else if (substream->f_flags & O_NONBLOCK)
1444 nonblock = 1;
1445
1446 down_read(&snd_pcm_link_rwsem);
1447 snd_pcm_stream_lock_irq(substream);
1448 /* resume pause */
1449 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1450 snd_pcm_pause(substream, 0);
1451
1452 /* pre-start/stop - all running streams are changed to DRAINING state */
1453 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1454 if (result < 0)
1455 goto unlock;
1456 /* in non-blocking, we don't wait in ioctl but let caller poll */
1457 if (nonblock) {
1458 result = -EAGAIN;
1459 goto unlock;
1460 }
1461
1462 for (;;) {
1463 long tout;
1464 struct snd_pcm_runtime *to_check;
1465 if (signal_pending(current)) {
1466 result = -ERESTARTSYS;
1467 break;
1468 }
1469 /* find a substream to drain */
1470 to_check = NULL;
1471 snd_pcm_group_for_each_entry(s, substream) {
1472 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1473 continue;
1474 runtime = s->runtime;
1475 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1476 to_check = runtime;
1477 break;
1478 }
1479 }
1480 if (!to_check)
1481 break; /* all drained */
1482 init_waitqueue_entry(&wait, current);
1483 add_wait_queue(&to_check->sleep, &wait);
1484 snd_pcm_stream_unlock_irq(substream);
1485 up_read(&snd_pcm_link_rwsem);
1486 snd_power_unlock(card);
1487 if (runtime->no_period_wakeup)
1488 tout = MAX_SCHEDULE_TIMEOUT;
1489 else {
1490 tout = 10;
1491 if (runtime->rate) {
1492 long t = runtime->period_size * 2 / runtime->rate;
1493 tout = max(t, tout);
1494 }
1495 tout = msecs_to_jiffies(tout * 1000);
1496 }
1497 tout = schedule_timeout_interruptible(tout);
1498 snd_power_lock(card);
1499 down_read(&snd_pcm_link_rwsem);
1500 snd_pcm_stream_lock_irq(substream);
1501 remove_wait_queue(&to_check->sleep, &wait);
1502 if (tout == 0) {
1503 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1504 result = -ESTRPIPE;
1505 else {
1506 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1507 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1508 result = -EIO;
1509 }
1510 break;
1511 }
1512 }
1513
1514 unlock:
1515 snd_pcm_stream_unlock_irq(substream);
1516 up_read(&snd_pcm_link_rwsem);
1517 snd_power_unlock(card);
1518
1519 return result;
1520}
1521
1522/*
1523 * drop ioctl
1524 *
1525 * Immediately put all linked substreams into SETUP state.
1526 */
1527static int snd_pcm_drop(struct snd_pcm_substream *substream)
1528{
1529 struct snd_pcm_runtime *runtime;
1530 int result = 0;
1531
1532 if (PCM_RUNTIME_CHECK(substream))
1533 return -ENXIO;
1534 runtime = substream->runtime;
1535
1536 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1537 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1538 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1539 return -EBADFD;
1540
1541 snd_pcm_stream_lock_irq(substream);
1542 /* resume pause */
1543 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1544 snd_pcm_pause(substream, 0);
1545
1546 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1547 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1548 snd_pcm_stream_unlock_irq(substream);
1549
1550 return result;
1551}
1552
1553
1554/* WARNING: Don't forget to fput back the file */
1555static struct file *snd_pcm_file_fd(int fd)
1556{
1557 struct file *file;
1558 struct inode *inode;
1559 unsigned int minor;
1560
1561 file = fget(fd);
1562 if (!file)
1563 return NULL;
1564 inode = file->f_path.dentry->d_inode;
1565 if (!S_ISCHR(inode->i_mode) ||
1566 imajor(inode) != snd_major) {
1567 fput(file);
1568 return NULL;
1569 }
1570 minor = iminor(inode);
1571 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1572 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1573 fput(file);
1574 return NULL;
1575 }
1576 return file;
1577}
1578
1579/*
1580 * PCM link handling
1581 */
1582static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1583{
1584 int res = 0;
1585 struct file *file;
1586 struct snd_pcm_file *pcm_file;
1587 struct snd_pcm_substream *substream1;
1588
1589 file = snd_pcm_file_fd(fd);
1590 if (!file)
1591 return -EBADFD;
1592 pcm_file = file->private_data;
1593 substream1 = pcm_file->substream;
1594 down_write(&snd_pcm_link_rwsem);
1595 write_lock_irq(&snd_pcm_link_rwlock);
1596 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1597 substream->runtime->status->state != substream1->runtime->status->state) {
1598 res = -EBADFD;
1599 goto _end;
1600 }
1601 if (snd_pcm_stream_linked(substream1)) {
1602 res = -EALREADY;
1603 goto _end;
1604 }
1605 if (!snd_pcm_stream_linked(substream)) {
1606 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1607 if (substream->group == NULL) {
1608 res = -ENOMEM;
1609 goto _end;
1610 }
1611 spin_lock_init(&substream->group->lock);
1612 INIT_LIST_HEAD(&substream->group->substreams);
1613 list_add_tail(&substream->link_list, &substream->group->substreams);
1614 substream->group->count = 1;
1615 }
1616 list_add_tail(&substream1->link_list, &substream->group->substreams);
1617 substream->group->count++;
1618 substream1->group = substream->group;
1619 _end:
1620 write_unlock_irq(&snd_pcm_link_rwlock);
1621 up_write(&snd_pcm_link_rwsem);
1622 fput(file);
1623 return res;
1624}
1625
1626static void relink_to_local(struct snd_pcm_substream *substream)
1627{
1628 substream->group = &substream->self_group;
1629 INIT_LIST_HEAD(&substream->self_group.substreams);
1630 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1631}
1632
1633static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1634{
1635 struct snd_pcm_substream *s;
1636 int res = 0;
1637
1638 down_write(&snd_pcm_link_rwsem);
1639 write_lock_irq(&snd_pcm_link_rwlock);
1640 if (!snd_pcm_stream_linked(substream)) {
1641 res = -EALREADY;
1642 goto _end;
1643 }
1644 list_del(&substream->link_list);
1645 substream->group->count--;
1646 if (substream->group->count == 1) { /* detach the last stream, too */
1647 snd_pcm_group_for_each_entry(s, substream) {
1648 relink_to_local(s);
1649 break;
1650 }
1651 kfree(substream->group);
1652 }
1653 relink_to_local(substream);
1654 _end:
1655 write_unlock_irq(&snd_pcm_link_rwlock);
1656 up_write(&snd_pcm_link_rwsem);
1657 return res;
1658}
1659
1660/*
1661 * hw configurator
1662 */
1663static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1664 struct snd_pcm_hw_rule *rule)
1665{
1666 struct snd_interval t;
1667 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1668 hw_param_interval_c(params, rule->deps[1]), &t);
1669 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1670}
1671
1672static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1673 struct snd_pcm_hw_rule *rule)
1674{
1675 struct snd_interval t;
1676 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1677 hw_param_interval_c(params, rule->deps[1]), &t);
1678 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1679}
1680
1681static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1682 struct snd_pcm_hw_rule *rule)
1683{
1684 struct snd_interval t;
1685 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1686 hw_param_interval_c(params, rule->deps[1]),
1687 (unsigned long) rule->private, &t);
1688 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1689}
1690
1691static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1692 struct snd_pcm_hw_rule *rule)
1693{
1694 struct snd_interval t;
1695 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1696 (unsigned long) rule->private,
1697 hw_param_interval_c(params, rule->deps[1]), &t);
1698 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1699}
1700
1701static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1702 struct snd_pcm_hw_rule *rule)
1703{
1704 unsigned int k;
1705 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1706 struct snd_mask m;
1707 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1708 snd_mask_any(&m);
1709 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1710 int bits;
1711 if (! snd_mask_test(mask, k))
1712 continue;
1713 bits = snd_pcm_format_physical_width(k);
1714 if (bits <= 0)
1715 continue; /* ignore invalid formats */
1716 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1717 snd_mask_reset(&m, k);
1718 }
1719 return snd_mask_refine(mask, &m);
1720}
1721
1722static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1723 struct snd_pcm_hw_rule *rule)
1724{
1725 struct snd_interval t;
1726 unsigned int k;
1727 t.min = UINT_MAX;
1728 t.max = 0;
1729 t.openmin = 0;
1730 t.openmax = 0;
1731 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1732 int bits;
1733 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1734 continue;
1735 bits = snd_pcm_format_physical_width(k);
1736 if (bits <= 0)
1737 continue; /* ignore invalid formats */
1738 if (t.min > (unsigned)bits)
1739 t.min = bits;
1740 if (t.max < (unsigned)bits)
1741 t.max = bits;
1742 }
1743 t.integer = 1;
1744 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1745}
1746
1747#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1748#error "Change this table"
1749#endif
1750
1751static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1752 48000, 64000, 88200, 96000, 176400, 192000 };
1753
1754const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1755 .count = ARRAY_SIZE(rates),
1756 .list = rates,
1757};
1758
1759static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1760 struct snd_pcm_hw_rule *rule)
1761{
1762 struct snd_pcm_hardware *hw = rule->private;
1763 return snd_interval_list(hw_param_interval(params, rule->var),
1764 snd_pcm_known_rates.count,
1765 snd_pcm_known_rates.list, hw->rates);
1766}
1767
1768static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1769 struct snd_pcm_hw_rule *rule)
1770{
1771 struct snd_interval t;
1772 struct snd_pcm_substream *substream = rule->private;
1773 t.min = 0;
1774 t.max = substream->buffer_bytes_max;
1775 t.openmin = 0;
1776 t.openmax = 0;
1777 t.integer = 1;
1778 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1779}
1780
1781int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1782{
1783 struct snd_pcm_runtime *runtime = substream->runtime;
1784 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1785 int k, err;
1786
1787 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1788 snd_mask_any(constrs_mask(constrs, k));
1789 }
1790
1791 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1792 snd_interval_any(constrs_interval(constrs, k));
1793 }
1794
1795 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1796 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1797 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1798 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1799 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1800
1801 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1802 snd_pcm_hw_rule_format, NULL,
1803 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1804 if (err < 0)
1805 return err;
1806 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1807 snd_pcm_hw_rule_sample_bits, NULL,
1808 SNDRV_PCM_HW_PARAM_FORMAT,
1809 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1810 if (err < 0)
1811 return err;
1812 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1813 snd_pcm_hw_rule_div, NULL,
1814 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1815 if (err < 0)
1816 return err;
1817 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1818 snd_pcm_hw_rule_mul, NULL,
1819 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1820 if (err < 0)
1821 return err;
1822 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1823 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1824 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1825 if (err < 0)
1826 return err;
1827 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1828 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1829 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1830 if (err < 0)
1831 return err;
1832 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1833 snd_pcm_hw_rule_div, NULL,
1834 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1835 if (err < 0)
1836 return err;
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1838 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1839 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1843 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1844 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1845 if (err < 0)
1846 return err;
1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1848 snd_pcm_hw_rule_div, NULL,
1849 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1850 if (err < 0)
1851 return err;
1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1853 snd_pcm_hw_rule_div, NULL,
1854 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1855 if (err < 0)
1856 return err;
1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1858 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1859 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1860 if (err < 0)
1861 return err;
1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1863 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1864 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1865 if (err < 0)
1866 return err;
1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1868 snd_pcm_hw_rule_mul, NULL,
1869 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1870 if (err < 0)
1871 return err;
1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1873 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1874 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1875 if (err < 0)
1876 return err;
1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1878 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1879 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1880 if (err < 0)
1881 return err;
1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1883 snd_pcm_hw_rule_muldivk, (void*) 8,
1884 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1885 if (err < 0)
1886 return err;
1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1888 snd_pcm_hw_rule_muldivk, (void*) 8,
1889 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1890 if (err < 0)
1891 return err;
1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1893 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1894 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1895 if (err < 0)
1896 return err;
1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1898 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1899 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1900 if (err < 0)
1901 return err;
1902 return 0;
1903}
1904
1905int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1906{
1907 struct snd_pcm_runtime *runtime = substream->runtime;
1908 struct snd_pcm_hardware *hw = &runtime->hw;
1909 int err;
1910 unsigned int mask = 0;
1911
1912 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1913 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1914 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1915 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1916 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1917 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1918 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1919 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1920 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1921 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1922 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1923 }
1924 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1925 if (err < 0)
1926 return err;
1927
1928 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1929 if (err < 0)
1930 return err;
1931
1932 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1933 if (err < 0)
1934 return err;
1935
1936 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1937 hw->channels_min, hw->channels_max);
1938 if (err < 0)
1939 return err;
1940
1941 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1942 hw->rate_min, hw->rate_max);
1943 if (err < 0)
1944 return err;
1945
1946 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1947 hw->period_bytes_min, hw->period_bytes_max);
1948 if (err < 0)
1949 return err;
1950
1951 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1952 hw->periods_min, hw->periods_max);
1953 if (err < 0)
1954 return err;
1955
1956 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1957 hw->period_bytes_min, hw->buffer_bytes_max);
1958 if (err < 0)
1959 return err;
1960
1961 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1962 snd_pcm_hw_rule_buffer_bytes_max, substream,
1963 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1964 if (err < 0)
1965 return err;
1966
1967 /* FIXME: remove */
1968 if (runtime->dma_bytes) {
1969 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1970 if (err < 0)
1971 return -EINVAL;
1972 }
1973
1974 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1975 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1976 snd_pcm_hw_rule_rate, hw,
1977 SNDRV_PCM_HW_PARAM_RATE, -1);
1978 if (err < 0)
1979 return err;
1980 }
1981
1982 /* FIXME: this belong to lowlevel */
1983 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1984
1985 return 0;
1986}
1987
1988static void pcm_release_private(struct snd_pcm_substream *substream)
1989{
1990 snd_pcm_unlink(substream);
1991}
1992
1993void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1994{
1995 substream->ref_count--;
1996 if (substream->ref_count > 0)
1997 return;
1998
1999 snd_pcm_drop(substream);
2000 if (substream->hw_opened) {
2001 if (substream->ops->hw_free != NULL)
2002 substream->ops->hw_free(substream);
2003 substream->ops->close(substream);
2004 substream->hw_opened = 0;
2005 }
2006 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2007 pm_qos_remove_request(&substream->latency_pm_qos_req);
2008 if (substream->pcm_release) {
2009 substream->pcm_release(substream);
2010 substream->pcm_release = NULL;
2011 }
2012 snd_pcm_detach_substream(substream);
2013}
2014
2015EXPORT_SYMBOL(snd_pcm_release_substream);
2016
2017int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2018 struct file *file,
2019 struct snd_pcm_substream **rsubstream)
2020{
2021 struct snd_pcm_substream *substream;
2022 int err;
2023
2024 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2025 if (err < 0)
2026 return err;
2027 if (substream->ref_count > 1) {
2028 *rsubstream = substream;
2029 return 0;
2030 }
2031
2032 err = snd_pcm_hw_constraints_init(substream);
2033 if (err < 0) {
2034 snd_printd("snd_pcm_hw_constraints_init failed\n");
2035 goto error;
2036 }
2037
2038 if ((err = substream->ops->open(substream)) < 0)
2039 goto error;
2040
2041 substream->hw_opened = 1;
2042
2043 err = snd_pcm_hw_constraints_complete(substream);
2044 if (err < 0) {
2045 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2046 goto error;
2047 }
2048
2049 *rsubstream = substream;
2050 return 0;
2051
2052 error:
2053 snd_pcm_release_substream(substream);
2054 return err;
2055}
2056
2057EXPORT_SYMBOL(snd_pcm_open_substream);
2058
2059static int snd_pcm_open_file(struct file *file,
2060 struct snd_pcm *pcm,
2061 int stream,
2062 struct snd_pcm_file **rpcm_file)
2063{
2064 struct snd_pcm_file *pcm_file;
2065 struct snd_pcm_substream *substream;
2066 int err;
2067
2068 if (rpcm_file)
2069 *rpcm_file = NULL;
2070
2071 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2072 if (err < 0)
2073 return err;
2074
2075 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2076 if (pcm_file == NULL) {
2077 snd_pcm_release_substream(substream);
2078 return -ENOMEM;
2079 }
2080 pcm_file->substream = substream;
2081 if (substream->ref_count == 1) {
2082 substream->file = pcm_file;
2083 substream->pcm_release = pcm_release_private;
2084 }
2085 file->private_data = pcm_file;
2086 if (rpcm_file)
2087 *rpcm_file = pcm_file;
2088 return 0;
2089}
2090
2091static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2092{
2093 struct snd_pcm *pcm;
2094 int err = nonseekable_open(inode, file);
2095 if (err < 0)
2096 return err;
2097 pcm = snd_lookup_minor_data(iminor(inode),
2098 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2099 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2100}
2101
2102static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2103{
2104 struct snd_pcm *pcm;
2105 int err = nonseekable_open(inode, file);
2106 if (err < 0)
2107 return err;
2108 pcm = snd_lookup_minor_data(iminor(inode),
2109 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2110 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2111}
2112
2113static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2114{
2115 int err;
2116 struct snd_pcm_file *pcm_file;
2117 wait_queue_t wait;
2118
2119 if (pcm == NULL) {
2120 err = -ENODEV;
2121 goto __error1;
2122 }
2123 err = snd_card_file_add(pcm->card, file);
2124 if (err < 0)
2125 goto __error1;
2126 if (!try_module_get(pcm->card->module)) {
2127 err = -EFAULT;
2128 goto __error2;
2129 }
2130 init_waitqueue_entry(&wait, current);
2131 add_wait_queue(&pcm->open_wait, &wait);
2132 mutex_lock(&pcm->open_mutex);
2133 while (1) {
2134 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2135 if (err >= 0)
2136 break;
2137 if (err == -EAGAIN) {
2138 if (file->f_flags & O_NONBLOCK) {
2139 err = -EBUSY;
2140 break;
2141 }
2142 } else
2143 break;
2144 set_current_state(TASK_INTERRUPTIBLE);
2145 mutex_unlock(&pcm->open_mutex);
2146 schedule();
2147 mutex_lock(&pcm->open_mutex);
2148 if (signal_pending(current)) {
2149 err = -ERESTARTSYS;
2150 break;
2151 }
2152 }
2153 remove_wait_queue(&pcm->open_wait, &wait);
2154 mutex_unlock(&pcm->open_mutex);
2155 if (err < 0)
2156 goto __error;
2157 return err;
2158
2159 __error:
2160 module_put(pcm->card->module);
2161 __error2:
2162 snd_card_file_remove(pcm->card, file);
2163 __error1:
2164 return err;
2165}
2166
2167static int snd_pcm_release(struct inode *inode, struct file *file)
2168{
2169 struct snd_pcm *pcm;
2170 struct snd_pcm_substream *substream;
2171 struct snd_pcm_file *pcm_file;
2172
2173 pcm_file = file->private_data;
2174 substream = pcm_file->substream;
2175 if (snd_BUG_ON(!substream))
2176 return -ENXIO;
2177 pcm = substream->pcm;
2178 mutex_lock(&pcm->open_mutex);
2179 snd_pcm_release_substream(substream);
2180 kfree(pcm_file);
2181 mutex_unlock(&pcm->open_mutex);
2182 wake_up(&pcm->open_wait);
2183 module_put(pcm->card->module);
2184 snd_card_file_remove(pcm->card, file);
2185 return 0;
2186}
2187
2188static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2189 snd_pcm_uframes_t frames)
2190{
2191 struct snd_pcm_runtime *runtime = substream->runtime;
2192 snd_pcm_sframes_t appl_ptr;
2193 snd_pcm_sframes_t ret;
2194 snd_pcm_sframes_t hw_avail;
2195
2196 if (frames == 0)
2197 return 0;
2198
2199 snd_pcm_stream_lock_irq(substream);
2200 switch (runtime->status->state) {
2201 case SNDRV_PCM_STATE_PREPARED:
2202 break;
2203 case SNDRV_PCM_STATE_DRAINING:
2204 case SNDRV_PCM_STATE_RUNNING:
2205 if (snd_pcm_update_hw_ptr(substream) >= 0)
2206 break;
2207 /* Fall through */
2208 case SNDRV_PCM_STATE_XRUN:
2209 ret = -EPIPE;
2210 goto __end;
2211 case SNDRV_PCM_STATE_SUSPENDED:
2212 ret = -ESTRPIPE;
2213 goto __end;
2214 default:
2215 ret = -EBADFD;
2216 goto __end;
2217 }
2218
2219 hw_avail = snd_pcm_playback_hw_avail(runtime);
2220 if (hw_avail <= 0) {
2221 ret = 0;
2222 goto __end;
2223 }
2224 if (frames > (snd_pcm_uframes_t)hw_avail)
2225 frames = hw_avail;
2226 appl_ptr = runtime->control->appl_ptr - frames;
2227 if (appl_ptr < 0)
2228 appl_ptr += runtime->boundary;
2229 runtime->control->appl_ptr = appl_ptr;
2230 ret = frames;
2231 __end:
2232 snd_pcm_stream_unlock_irq(substream);
2233 return ret;
2234}
2235
2236static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2237 snd_pcm_uframes_t frames)
2238{
2239 struct snd_pcm_runtime *runtime = substream->runtime;
2240 snd_pcm_sframes_t appl_ptr;
2241 snd_pcm_sframes_t ret;
2242 snd_pcm_sframes_t hw_avail;
2243
2244 if (frames == 0)
2245 return 0;
2246
2247 snd_pcm_stream_lock_irq(substream);
2248 switch (runtime->status->state) {
2249 case SNDRV_PCM_STATE_PREPARED:
2250 case SNDRV_PCM_STATE_DRAINING:
2251 break;
2252 case SNDRV_PCM_STATE_RUNNING:
2253 if (snd_pcm_update_hw_ptr(substream) >= 0)
2254 break;
2255 /* Fall through */
2256 case SNDRV_PCM_STATE_XRUN:
2257 ret = -EPIPE;
2258 goto __end;
2259 case SNDRV_PCM_STATE_SUSPENDED:
2260 ret = -ESTRPIPE;
2261 goto __end;
2262 default:
2263 ret = -EBADFD;
2264 goto __end;
2265 }
2266
2267 hw_avail = snd_pcm_capture_hw_avail(runtime);
2268 if (hw_avail <= 0) {
2269 ret = 0;
2270 goto __end;
2271 }
2272 if (frames > (snd_pcm_uframes_t)hw_avail)
2273 frames = hw_avail;
2274 appl_ptr = runtime->control->appl_ptr - frames;
2275 if (appl_ptr < 0)
2276 appl_ptr += runtime->boundary;
2277 runtime->control->appl_ptr = appl_ptr;
2278 ret = frames;
2279 __end:
2280 snd_pcm_stream_unlock_irq(substream);
2281 return ret;
2282}
2283
2284static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2285 snd_pcm_uframes_t frames)
2286{
2287 struct snd_pcm_runtime *runtime = substream->runtime;
2288 snd_pcm_sframes_t appl_ptr;
2289 snd_pcm_sframes_t ret;
2290 snd_pcm_sframes_t avail;
2291
2292 if (frames == 0)
2293 return 0;
2294
2295 snd_pcm_stream_lock_irq(substream);
2296 switch (runtime->status->state) {
2297 case SNDRV_PCM_STATE_PREPARED:
2298 case SNDRV_PCM_STATE_PAUSED:
2299 break;
2300 case SNDRV_PCM_STATE_DRAINING:
2301 case SNDRV_PCM_STATE_RUNNING:
2302 if (snd_pcm_update_hw_ptr(substream) >= 0)
2303 break;
2304 /* Fall through */
2305 case SNDRV_PCM_STATE_XRUN:
2306 ret = -EPIPE;
2307 goto __end;
2308 case SNDRV_PCM_STATE_SUSPENDED:
2309 ret = -ESTRPIPE;
2310 goto __end;
2311 default:
2312 ret = -EBADFD;
2313 goto __end;
2314 }
2315
2316 avail = snd_pcm_playback_avail(runtime);
2317 if (avail <= 0) {
2318 ret = 0;
2319 goto __end;
2320 }
2321 if (frames > (snd_pcm_uframes_t)avail)
2322 frames = avail;
2323 appl_ptr = runtime->control->appl_ptr + frames;
2324 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2325 appl_ptr -= runtime->boundary;
2326 runtime->control->appl_ptr = appl_ptr;
2327 ret = frames;
2328 __end:
2329 snd_pcm_stream_unlock_irq(substream);
2330 return ret;
2331}
2332
2333static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2334 snd_pcm_uframes_t frames)
2335{
2336 struct snd_pcm_runtime *runtime = substream->runtime;
2337 snd_pcm_sframes_t appl_ptr;
2338 snd_pcm_sframes_t ret;
2339 snd_pcm_sframes_t avail;
2340
2341 if (frames == 0)
2342 return 0;
2343
2344 snd_pcm_stream_lock_irq(substream);
2345 switch (runtime->status->state) {
2346 case SNDRV_PCM_STATE_PREPARED:
2347 case SNDRV_PCM_STATE_DRAINING:
2348 case SNDRV_PCM_STATE_PAUSED:
2349 break;
2350 case SNDRV_PCM_STATE_RUNNING:
2351 if (snd_pcm_update_hw_ptr(substream) >= 0)
2352 break;
2353 /* Fall through */
2354 case SNDRV_PCM_STATE_XRUN:
2355 ret = -EPIPE;
2356 goto __end;
2357 case SNDRV_PCM_STATE_SUSPENDED:
2358 ret = -ESTRPIPE;
2359 goto __end;
2360 default:
2361 ret = -EBADFD;
2362 goto __end;
2363 }
2364
2365 avail = snd_pcm_capture_avail(runtime);
2366 if (avail <= 0) {
2367 ret = 0;
2368 goto __end;
2369 }
2370 if (frames > (snd_pcm_uframes_t)avail)
2371 frames = avail;
2372 appl_ptr = runtime->control->appl_ptr + frames;
2373 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2374 appl_ptr -= runtime->boundary;
2375 runtime->control->appl_ptr = appl_ptr;
2376 ret = frames;
2377 __end:
2378 snd_pcm_stream_unlock_irq(substream);
2379 return ret;
2380}
2381
2382static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2383{
2384 struct snd_pcm_runtime *runtime = substream->runtime;
2385 int err;
2386
2387 snd_pcm_stream_lock_irq(substream);
2388 switch (runtime->status->state) {
2389 case SNDRV_PCM_STATE_DRAINING:
2390 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2391 goto __badfd;
2392 case SNDRV_PCM_STATE_RUNNING:
2393 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2394 break;
2395 /* Fall through */
2396 case SNDRV_PCM_STATE_PREPARED:
2397 case SNDRV_PCM_STATE_SUSPENDED:
2398 err = 0;
2399 break;
2400 case SNDRV_PCM_STATE_XRUN:
2401 err = -EPIPE;
2402 break;
2403 default:
2404 __badfd:
2405 err = -EBADFD;
2406 break;
2407 }
2408 snd_pcm_stream_unlock_irq(substream);
2409 return err;
2410}
2411
2412static int snd_pcm_delay(struct snd_pcm_substream *substream,
2413 snd_pcm_sframes_t __user *res)
2414{
2415 struct snd_pcm_runtime *runtime = substream->runtime;
2416 int err;
2417 snd_pcm_sframes_t n = 0;
2418
2419 snd_pcm_stream_lock_irq(substream);
2420 switch (runtime->status->state) {
2421 case SNDRV_PCM_STATE_DRAINING:
2422 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2423 goto __badfd;
2424 case SNDRV_PCM_STATE_RUNNING:
2425 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2426 break;
2427 /* Fall through */
2428 case SNDRV_PCM_STATE_PREPARED:
2429 case SNDRV_PCM_STATE_SUSPENDED:
2430 err = 0;
2431 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2432 n = snd_pcm_playback_hw_avail(runtime);
2433 else
2434 n = snd_pcm_capture_avail(runtime);
2435 n += runtime->delay;
2436 break;
2437 case SNDRV_PCM_STATE_XRUN:
2438 err = -EPIPE;
2439 break;
2440 default:
2441 __badfd:
2442 err = -EBADFD;
2443 break;
2444 }
2445 snd_pcm_stream_unlock_irq(substream);
2446 if (!err)
2447 if (put_user(n, res))
2448 err = -EFAULT;
2449 return err;
2450}
2451
2452static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2453 struct snd_pcm_sync_ptr __user *_sync_ptr)
2454{
2455 struct snd_pcm_runtime *runtime = substream->runtime;
2456 struct snd_pcm_sync_ptr sync_ptr;
2457 volatile struct snd_pcm_mmap_status *status;
2458 volatile struct snd_pcm_mmap_control *control;
2459 int err;
2460
2461 memset(&sync_ptr, 0, sizeof(sync_ptr));
2462 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2463 return -EFAULT;
2464 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2465 return -EFAULT;
2466 status = runtime->status;
2467 control = runtime->control;
2468 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2469 err = snd_pcm_hwsync(substream);
2470 if (err < 0)
2471 return err;
2472 }
2473 snd_pcm_stream_lock_irq(substream);
2474 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2475 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2476 else
2477 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2478 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2479 control->avail_min = sync_ptr.c.control.avail_min;
2480 else
2481 sync_ptr.c.control.avail_min = control->avail_min;
2482 sync_ptr.s.status.state = status->state;
2483 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2484 sync_ptr.s.status.tstamp = status->tstamp;
2485 sync_ptr.s.status.suspended_state = status->suspended_state;
2486 snd_pcm_stream_unlock_irq(substream);
2487 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2488 return -EFAULT;
2489 return 0;
2490}
2491
2492static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2493{
2494 struct snd_pcm_runtime *runtime = substream->runtime;
2495 int arg;
2496
2497 if (get_user(arg, _arg))
2498 return -EFAULT;
2499 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2500 return -EINVAL;
2501 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2502 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2503 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2504 return 0;
2505}
2506
2507static int snd_pcm_common_ioctl1(struct file *file,
2508 struct snd_pcm_substream *substream,
2509 unsigned int cmd, void __user *arg)
2510{
2511 switch (cmd) {
2512 case SNDRV_PCM_IOCTL_PVERSION:
2513 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2514 case SNDRV_PCM_IOCTL_INFO:
2515 return snd_pcm_info_user(substream, arg);
2516 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2517 return 0;
2518 case SNDRV_PCM_IOCTL_TTSTAMP:
2519 return snd_pcm_tstamp(substream, arg);
2520 case SNDRV_PCM_IOCTL_HW_REFINE:
2521 return snd_pcm_hw_refine_user(substream, arg);
2522 case SNDRV_PCM_IOCTL_HW_PARAMS:
2523 return snd_pcm_hw_params_user(substream, arg);
2524 case SNDRV_PCM_IOCTL_HW_FREE:
2525 return snd_pcm_hw_free(substream);
2526 case SNDRV_PCM_IOCTL_SW_PARAMS:
2527 return snd_pcm_sw_params_user(substream, arg);
2528 case SNDRV_PCM_IOCTL_STATUS:
2529 return snd_pcm_status_user(substream, arg);
2530 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2531 return snd_pcm_channel_info_user(substream, arg);
2532 case SNDRV_PCM_IOCTL_PREPARE:
2533 return snd_pcm_prepare(substream, file);
2534 case SNDRV_PCM_IOCTL_RESET:
2535 return snd_pcm_reset(substream);
2536 case SNDRV_PCM_IOCTL_START:
2537 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2538 case SNDRV_PCM_IOCTL_LINK:
2539 return snd_pcm_link(substream, (int)(unsigned long) arg);
2540 case SNDRV_PCM_IOCTL_UNLINK:
2541 return snd_pcm_unlink(substream);
2542 case SNDRV_PCM_IOCTL_RESUME:
2543 return snd_pcm_resume(substream);
2544 case SNDRV_PCM_IOCTL_XRUN:
2545 return snd_pcm_xrun(substream);
2546 case SNDRV_PCM_IOCTL_HWSYNC:
2547 return snd_pcm_hwsync(substream);
2548 case SNDRV_PCM_IOCTL_DELAY:
2549 return snd_pcm_delay(substream, arg);
2550 case SNDRV_PCM_IOCTL_SYNC_PTR:
2551 return snd_pcm_sync_ptr(substream, arg);
2552#ifdef CONFIG_SND_SUPPORT_OLD_API
2553 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2554 return snd_pcm_hw_refine_old_user(substream, arg);
2555 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2556 return snd_pcm_hw_params_old_user(substream, arg);
2557#endif
2558 case SNDRV_PCM_IOCTL_DRAIN:
2559 return snd_pcm_drain(substream, file);
2560 case SNDRV_PCM_IOCTL_DROP:
2561 return snd_pcm_drop(substream);
2562 case SNDRV_PCM_IOCTL_PAUSE:
2563 {
2564 int res;
2565 snd_pcm_stream_lock_irq(substream);
2566 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2567 snd_pcm_stream_unlock_irq(substream);
2568 return res;
2569 }
2570 }
2571 snd_printd("unknown ioctl = 0x%x\n", cmd);
2572 return -ENOTTY;
2573}
2574
2575static int snd_pcm_playback_ioctl1(struct file *file,
2576 struct snd_pcm_substream *substream,
2577 unsigned int cmd, void __user *arg)
2578{
2579 if (snd_BUG_ON(!substream))
2580 return -ENXIO;
2581 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2582 return -EINVAL;
2583 switch (cmd) {
2584 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2585 {
2586 struct snd_xferi xferi;
2587 struct snd_xferi __user *_xferi = arg;
2588 struct snd_pcm_runtime *runtime = substream->runtime;
2589 snd_pcm_sframes_t result;
2590 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2591 return -EBADFD;
2592 if (put_user(0, &_xferi->result))
2593 return -EFAULT;
2594 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2595 return -EFAULT;
2596 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2597 __put_user(result, &_xferi->result);
2598 return result < 0 ? result : 0;
2599 }
2600 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2601 {
2602 struct snd_xfern xfern;
2603 struct snd_xfern __user *_xfern = arg;
2604 struct snd_pcm_runtime *runtime = substream->runtime;
2605 void __user **bufs;
2606 snd_pcm_sframes_t result;
2607 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2608 return -EBADFD;
2609 if (runtime->channels > 128)
2610 return -EINVAL;
2611 if (put_user(0, &_xfern->result))
2612 return -EFAULT;
2613 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2614 return -EFAULT;
2615
2616 bufs = memdup_user(xfern.bufs,
2617 sizeof(void *) * runtime->channels);
2618 if (IS_ERR(bufs))
2619 return PTR_ERR(bufs);
2620 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2621 kfree(bufs);
2622 __put_user(result, &_xfern->result);
2623 return result < 0 ? result : 0;
2624 }
2625 case SNDRV_PCM_IOCTL_REWIND:
2626 {
2627 snd_pcm_uframes_t frames;
2628 snd_pcm_uframes_t __user *_frames = arg;
2629 snd_pcm_sframes_t result;
2630 if (get_user(frames, _frames))
2631 return -EFAULT;
2632 if (put_user(0, _frames))
2633 return -EFAULT;
2634 result = snd_pcm_playback_rewind(substream, frames);
2635 __put_user(result, _frames);
2636 return result < 0 ? result : 0;
2637 }
2638 case SNDRV_PCM_IOCTL_FORWARD:
2639 {
2640 snd_pcm_uframes_t frames;
2641 snd_pcm_uframes_t __user *_frames = arg;
2642 snd_pcm_sframes_t result;
2643 if (get_user(frames, _frames))
2644 return -EFAULT;
2645 if (put_user(0, _frames))
2646 return -EFAULT;
2647 result = snd_pcm_playback_forward(substream, frames);
2648 __put_user(result, _frames);
2649 return result < 0 ? result : 0;
2650 }
2651 }
2652 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2653}
2654
2655static int snd_pcm_capture_ioctl1(struct file *file,
2656 struct snd_pcm_substream *substream,
2657 unsigned int cmd, void __user *arg)
2658{
2659 if (snd_BUG_ON(!substream))
2660 return -ENXIO;
2661 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2662 return -EINVAL;
2663 switch (cmd) {
2664 case SNDRV_PCM_IOCTL_READI_FRAMES:
2665 {
2666 struct snd_xferi xferi;
2667 struct snd_xferi __user *_xferi = arg;
2668 struct snd_pcm_runtime *runtime = substream->runtime;
2669 snd_pcm_sframes_t result;
2670 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2671 return -EBADFD;
2672 if (put_user(0, &_xferi->result))
2673 return -EFAULT;
2674 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2675 return -EFAULT;
2676 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2677 __put_user(result, &_xferi->result);
2678 return result < 0 ? result : 0;
2679 }
2680 case SNDRV_PCM_IOCTL_READN_FRAMES:
2681 {
2682 struct snd_xfern xfern;
2683 struct snd_xfern __user *_xfern = arg;
2684 struct snd_pcm_runtime *runtime = substream->runtime;
2685 void *bufs;
2686 snd_pcm_sframes_t result;
2687 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2688 return -EBADFD;
2689 if (runtime->channels > 128)
2690 return -EINVAL;
2691 if (put_user(0, &_xfern->result))
2692 return -EFAULT;
2693 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2694 return -EFAULT;
2695
2696 bufs = memdup_user(xfern.bufs,
2697 sizeof(void *) * runtime->channels);
2698 if (IS_ERR(bufs))
2699 return PTR_ERR(bufs);
2700 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2701 kfree(bufs);
2702 __put_user(result, &_xfern->result);
2703 return result < 0 ? result : 0;
2704 }
2705 case SNDRV_PCM_IOCTL_REWIND:
2706 {
2707 snd_pcm_uframes_t frames;
2708 snd_pcm_uframes_t __user *_frames = arg;
2709 snd_pcm_sframes_t result;
2710 if (get_user(frames, _frames))
2711 return -EFAULT;
2712 if (put_user(0, _frames))
2713 return -EFAULT;
2714 result = snd_pcm_capture_rewind(substream, frames);
2715 __put_user(result, _frames);
2716 return result < 0 ? result : 0;
2717 }
2718 case SNDRV_PCM_IOCTL_FORWARD:
2719 {
2720 snd_pcm_uframes_t frames;
2721 snd_pcm_uframes_t __user *_frames = arg;
2722 snd_pcm_sframes_t result;
2723 if (get_user(frames, _frames))
2724 return -EFAULT;
2725 if (put_user(0, _frames))
2726 return -EFAULT;
2727 result = snd_pcm_capture_forward(substream, frames);
2728 __put_user(result, _frames);
2729 return result < 0 ? result : 0;
2730 }
2731 }
2732 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2733}
2734
2735static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2736 unsigned long arg)
2737{
2738 struct snd_pcm_file *pcm_file;
2739
2740 pcm_file = file->private_data;
2741
2742 if (((cmd >> 8) & 0xff) != 'A')
2743 return -ENOTTY;
2744
2745 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2746 (void __user *)arg);
2747}
2748
2749static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2750 unsigned long arg)
2751{
2752 struct snd_pcm_file *pcm_file;
2753
2754 pcm_file = file->private_data;
2755
2756 if (((cmd >> 8) & 0xff) != 'A')
2757 return -ENOTTY;
2758
2759 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2760 (void __user *)arg);
2761}
2762
2763int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2764 unsigned int cmd, void *arg)
2765{
2766 mm_segment_t fs;
2767 int result;
2768
2769 fs = snd_enter_user();
2770 switch (substream->stream) {
2771 case SNDRV_PCM_STREAM_PLAYBACK:
2772 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2773 (void __user *)arg);
2774 break;
2775 case SNDRV_PCM_STREAM_CAPTURE:
2776 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2777 (void __user *)arg);
2778 break;
2779 default:
2780 result = -EINVAL;
2781 break;
2782 }
2783 snd_leave_user(fs);
2784 return result;
2785}
2786
2787EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2788
2789static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2790 loff_t * offset)
2791{
2792 struct snd_pcm_file *pcm_file;
2793 struct snd_pcm_substream *substream;
2794 struct snd_pcm_runtime *runtime;
2795 snd_pcm_sframes_t result;
2796
2797 pcm_file = file->private_data;
2798 substream = pcm_file->substream;
2799 if (PCM_RUNTIME_CHECK(substream))
2800 return -ENXIO;
2801 runtime = substream->runtime;
2802 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2803 return -EBADFD;
2804 if (!frame_aligned(runtime, count))
2805 return -EINVAL;
2806 count = bytes_to_frames(runtime, count);
2807 result = snd_pcm_lib_read(substream, buf, count);
2808 if (result > 0)
2809 result = frames_to_bytes(runtime, result);
2810 return result;
2811}
2812
2813static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2814 size_t count, loff_t * offset)
2815{
2816 struct snd_pcm_file *pcm_file;
2817 struct snd_pcm_substream *substream;
2818 struct snd_pcm_runtime *runtime;
2819 snd_pcm_sframes_t result;
2820
2821 pcm_file = file->private_data;
2822 substream = pcm_file->substream;
2823 if (PCM_RUNTIME_CHECK(substream))
2824 return -ENXIO;
2825 runtime = substream->runtime;
2826 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2827 return -EBADFD;
2828 if (!frame_aligned(runtime, count))
2829 return -EINVAL;
2830 count = bytes_to_frames(runtime, count);
2831 result = snd_pcm_lib_write(substream, buf, count);
2832 if (result > 0)
2833 result = frames_to_bytes(runtime, result);
2834 return result;
2835}
2836
2837static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2838 unsigned long nr_segs, loff_t pos)
2839
2840{
2841 struct snd_pcm_file *pcm_file;
2842 struct snd_pcm_substream *substream;
2843 struct snd_pcm_runtime *runtime;
2844 snd_pcm_sframes_t result;
2845 unsigned long i;
2846 void __user **bufs;
2847 snd_pcm_uframes_t frames;
2848
2849 pcm_file = iocb->ki_filp->private_data;
2850 substream = pcm_file->substream;
2851 if (PCM_RUNTIME_CHECK(substream))
2852 return -ENXIO;
2853 runtime = substream->runtime;
2854 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2855 return -EBADFD;
2856 if (nr_segs > 1024 || nr_segs != runtime->channels)
2857 return -EINVAL;
2858 if (!frame_aligned(runtime, iov->iov_len))
2859 return -EINVAL;
2860 frames = bytes_to_samples(runtime, iov->iov_len);
2861 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2862 if (bufs == NULL)
2863 return -ENOMEM;
2864 for (i = 0; i < nr_segs; ++i)
2865 bufs[i] = iov[i].iov_base;
2866 result = snd_pcm_lib_readv(substream, bufs, frames);
2867 if (result > 0)
2868 result = frames_to_bytes(runtime, result);
2869 kfree(bufs);
2870 return result;
2871}
2872
2873static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2874 unsigned long nr_segs, loff_t pos)
2875{
2876 struct snd_pcm_file *pcm_file;
2877 struct snd_pcm_substream *substream;
2878 struct snd_pcm_runtime *runtime;
2879 snd_pcm_sframes_t result;
2880 unsigned long i;
2881 void __user **bufs;
2882 snd_pcm_uframes_t frames;
2883
2884 pcm_file = iocb->ki_filp->private_data;
2885 substream = pcm_file->substream;
2886 if (PCM_RUNTIME_CHECK(substream))
2887 return -ENXIO;
2888 runtime = substream->runtime;
2889 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2890 return -EBADFD;
2891 if (nr_segs > 128 || nr_segs != runtime->channels ||
2892 !frame_aligned(runtime, iov->iov_len))
2893 return -EINVAL;
2894 frames = bytes_to_samples(runtime, iov->iov_len);
2895 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2896 if (bufs == NULL)
2897 return -ENOMEM;
2898 for (i = 0; i < nr_segs; ++i)
2899 bufs[i] = iov[i].iov_base;
2900 result = snd_pcm_lib_writev(substream, bufs, frames);
2901 if (result > 0)
2902 result = frames_to_bytes(runtime, result);
2903 kfree(bufs);
2904 return result;
2905}
2906
2907static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2908{
2909 struct snd_pcm_file *pcm_file;
2910 struct snd_pcm_substream *substream;
2911 struct snd_pcm_runtime *runtime;
2912 unsigned int mask;
2913 snd_pcm_uframes_t avail;
2914
2915 pcm_file = file->private_data;
2916
2917 substream = pcm_file->substream;
2918 if (PCM_RUNTIME_CHECK(substream))
2919 return -ENXIO;
2920 runtime = substream->runtime;
2921
2922 poll_wait(file, &runtime->sleep, wait);
2923
2924 snd_pcm_stream_lock_irq(substream);
2925 avail = snd_pcm_playback_avail(runtime);
2926 switch (runtime->status->state) {
2927 case SNDRV_PCM_STATE_RUNNING:
2928 case SNDRV_PCM_STATE_PREPARED:
2929 case SNDRV_PCM_STATE_PAUSED:
2930 if (avail >= runtime->control->avail_min) {
2931 mask = POLLOUT | POLLWRNORM;
2932 break;
2933 }
2934 /* Fall through */
2935 case SNDRV_PCM_STATE_DRAINING:
2936 mask = 0;
2937 break;
2938 default:
2939 mask = POLLOUT | POLLWRNORM | POLLERR;
2940 break;
2941 }
2942 snd_pcm_stream_unlock_irq(substream);
2943 return mask;
2944}
2945
2946static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2947{
2948 struct snd_pcm_file *pcm_file;
2949 struct snd_pcm_substream *substream;
2950 struct snd_pcm_runtime *runtime;
2951 unsigned int mask;
2952 snd_pcm_uframes_t avail;
2953
2954 pcm_file = file->private_data;
2955
2956 substream = pcm_file->substream;
2957 if (PCM_RUNTIME_CHECK(substream))
2958 return -ENXIO;
2959 runtime = substream->runtime;
2960
2961 poll_wait(file, &runtime->sleep, wait);
2962
2963 snd_pcm_stream_lock_irq(substream);
2964 avail = snd_pcm_capture_avail(runtime);
2965 switch (runtime->status->state) {
2966 case SNDRV_PCM_STATE_RUNNING:
2967 case SNDRV_PCM_STATE_PREPARED:
2968 case SNDRV_PCM_STATE_PAUSED:
2969 if (avail >= runtime->control->avail_min) {
2970 mask = POLLIN | POLLRDNORM;
2971 break;
2972 }
2973 mask = 0;
2974 break;
2975 case SNDRV_PCM_STATE_DRAINING:
2976 if (avail > 0) {
2977 mask = POLLIN | POLLRDNORM;
2978 break;
2979 }
2980 /* Fall through */
2981 default:
2982 mask = POLLIN | POLLRDNORM | POLLERR;
2983 break;
2984 }
2985 snd_pcm_stream_unlock_irq(substream);
2986 return mask;
2987}
2988
2989/*
2990 * mmap support
2991 */
2992
2993/*
2994 * Only on coherent architectures, we can mmap the status and the control records
2995 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2996 */
2997#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2998/*
2999 * mmap status record
3000 */
3001static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3002 struct vm_fault *vmf)
3003{
3004 struct snd_pcm_substream *substream = area->vm_private_data;
3005 struct snd_pcm_runtime *runtime;
3006
3007 if (substream == NULL)
3008 return VM_FAULT_SIGBUS;
3009 runtime = substream->runtime;
3010 vmf->page = virt_to_page(runtime->status);
3011 get_page(vmf->page);
3012 return 0;
3013}
3014
3015static const struct vm_operations_struct snd_pcm_vm_ops_status =
3016{
3017 .fault = snd_pcm_mmap_status_fault,
3018};
3019
3020static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3021 struct vm_area_struct *area)
3022{
3023 long size;
3024 if (!(area->vm_flags & VM_READ))
3025 return -EINVAL;
3026 size = area->vm_end - area->vm_start;
3027 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3028 return -EINVAL;
3029 area->vm_ops = &snd_pcm_vm_ops_status;
3030 area->vm_private_data = substream;
3031 area->vm_flags |= VM_RESERVED;
3032 return 0;
3033}
3034
3035/*
3036 * mmap control record
3037 */
3038static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3039 struct vm_fault *vmf)
3040{
3041 struct snd_pcm_substream *substream = area->vm_private_data;
3042 struct snd_pcm_runtime *runtime;
3043
3044 if (substream == NULL)
3045 return VM_FAULT_SIGBUS;
3046 runtime = substream->runtime;
3047 vmf->page = virt_to_page(runtime->control);
3048 get_page(vmf->page);
3049 return 0;
3050}
3051
3052static const struct vm_operations_struct snd_pcm_vm_ops_control =
3053{
3054 .fault = snd_pcm_mmap_control_fault,
3055};
3056
3057static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3058 struct vm_area_struct *area)
3059{
3060 long size;
3061 if (!(area->vm_flags & VM_READ))
3062 return -EINVAL;
3063 size = area->vm_end - area->vm_start;
3064 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3065 return -EINVAL;
3066 area->vm_ops = &snd_pcm_vm_ops_control;
3067 area->vm_private_data = substream;
3068 area->vm_flags |= VM_RESERVED;
3069 return 0;
3070}
3071#else /* ! coherent mmap */
3072/*
3073 * don't support mmap for status and control records.
3074 */
3075static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3076 struct vm_area_struct *area)
3077{
3078 return -ENXIO;
3079}
3080static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3081 struct vm_area_struct *area)
3082{
3083 return -ENXIO;
3084}
3085#endif /* coherent mmap */
3086
3087static inline struct page *
3088snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3089{
3090 void *vaddr = substream->runtime->dma_area + ofs;
3091#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3092 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3093 return virt_to_page(CAC_ADDR(vaddr));
3094#endif
3095#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3096 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3097 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3098 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3099 /* assume dma_handle set via pfn_to_phys() in
3100 * mm/dma-noncoherent.c
3101 */
3102 return pfn_to_page(addr >> PAGE_SHIFT);
3103 }
3104#endif
3105 return virt_to_page(vaddr);
3106}
3107
3108/*
3109 * fault callback for mmapping a RAM page
3110 */
3111static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3112 struct vm_fault *vmf)
3113{
3114 struct snd_pcm_substream *substream = area->vm_private_data;
3115 struct snd_pcm_runtime *runtime;
3116 unsigned long offset;
3117 struct page * page;
3118 size_t dma_bytes;
3119
3120 if (substream == NULL)
3121 return VM_FAULT_SIGBUS;
3122 runtime = substream->runtime;
3123 offset = vmf->pgoff << PAGE_SHIFT;
3124 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3125 if (offset > dma_bytes - PAGE_SIZE)
3126 return VM_FAULT_SIGBUS;
3127 if (substream->ops->page)
3128 page = substream->ops->page(substream, offset);
3129 else
3130 page = snd_pcm_default_page_ops(substream, offset);
3131 if (!page)
3132 return VM_FAULT_SIGBUS;
3133 get_page(page);
3134 vmf->page = page;
3135 return 0;
3136}
3137
3138static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3139 .open = snd_pcm_mmap_data_open,
3140 .close = snd_pcm_mmap_data_close,
3141};
3142
3143static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3144 .open = snd_pcm_mmap_data_open,
3145 .close = snd_pcm_mmap_data_close,
3146 .fault = snd_pcm_mmap_data_fault,
3147};
3148
3149#ifndef ARCH_HAS_DMA_MMAP_COHERENT
3150/* This should be defined / handled globally! */
3151#ifdef CONFIG_ARM
3152#define ARCH_HAS_DMA_MMAP_COHERENT
3153#endif
3154#endif
3155
3156/*
3157 * mmap the DMA buffer on RAM
3158 */
3159static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3160 struct vm_area_struct *area)
3161{
3162 area->vm_flags |= VM_RESERVED;
3163#ifdef ARCH_HAS_DMA_MMAP_COHERENT
3164 if (!substream->ops->page &&
3165 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3166 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3167 area,
3168 substream->runtime->dma_area,
3169 substream->runtime->dma_addr,
3170 area->vm_end - area->vm_start);
3171#elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3172 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3173 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3174 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3175#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3176 /* mmap with fault handler */
3177 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3178 return 0;
3179}
3180
3181/*
3182 * mmap the DMA buffer on I/O memory area
3183 */
3184#if SNDRV_PCM_INFO_MMAP_IOMEM
3185int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3186 struct vm_area_struct *area)
3187{
3188 long size;
3189 unsigned long offset;
3190
3191 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3192 area->vm_flags |= VM_IO;
3193 size = area->vm_end - area->vm_start;
3194 offset = area->vm_pgoff << PAGE_SHIFT;
3195 if (io_remap_pfn_range(area, area->vm_start,
3196 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3197 size, area->vm_page_prot))
3198 return -EAGAIN;
3199 return 0;
3200}
3201
3202EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3203#endif /* SNDRV_PCM_INFO_MMAP */
3204
3205/*
3206 * mmap DMA buffer
3207 */
3208int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3209 struct vm_area_struct *area)
3210{
3211 struct snd_pcm_runtime *runtime;
3212 long size;
3213 unsigned long offset;
3214 size_t dma_bytes;
3215 int err;
3216
3217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3218 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3219 return -EINVAL;
3220 } else {
3221 if (!(area->vm_flags & VM_READ))
3222 return -EINVAL;
3223 }
3224 runtime = substream->runtime;
3225 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3226 return -EBADFD;
3227 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3228 return -ENXIO;
3229 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3230 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3231 return -EINVAL;
3232 size = area->vm_end - area->vm_start;
3233 offset = area->vm_pgoff << PAGE_SHIFT;
3234 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3235 if ((size_t)size > dma_bytes)
3236 return -EINVAL;
3237 if (offset > dma_bytes - size)
3238 return -EINVAL;
3239
3240 area->vm_ops = &snd_pcm_vm_ops_data;
3241 area->vm_private_data = substream;
3242 if (substream->ops->mmap)
3243 err = substream->ops->mmap(substream, area);
3244 else
3245 err = snd_pcm_default_mmap(substream, area);
3246 if (!err)
3247 atomic_inc(&substream->mmap_count);
3248 return err;
3249}
3250
3251EXPORT_SYMBOL(snd_pcm_mmap_data);
3252
3253static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3254{
3255 struct snd_pcm_file * pcm_file;
3256 struct snd_pcm_substream *substream;
3257 unsigned long offset;
3258
3259 pcm_file = file->private_data;
3260 substream = pcm_file->substream;
3261 if (PCM_RUNTIME_CHECK(substream))
3262 return -ENXIO;
3263
3264 offset = area->vm_pgoff << PAGE_SHIFT;
3265 switch (offset) {
3266 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3267 if (pcm_file->no_compat_mmap)
3268 return -ENXIO;
3269 return snd_pcm_mmap_status(substream, file, area);
3270 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3271 if (pcm_file->no_compat_mmap)
3272 return -ENXIO;
3273 return snd_pcm_mmap_control(substream, file, area);
3274 default:
3275 return snd_pcm_mmap_data(substream, file, area);
3276 }
3277 return 0;
3278}
3279
3280static int snd_pcm_fasync(int fd, struct file * file, int on)
3281{
3282 struct snd_pcm_file * pcm_file;
3283 struct snd_pcm_substream *substream;
3284 struct snd_pcm_runtime *runtime;
3285
3286 pcm_file = file->private_data;
3287 substream = pcm_file->substream;
3288 if (PCM_RUNTIME_CHECK(substream))
3289 return -ENXIO;
3290 runtime = substream->runtime;
3291 return fasync_helper(fd, file, on, &runtime->fasync);
3292}
3293
3294/*
3295 * ioctl32 compat
3296 */
3297#ifdef CONFIG_COMPAT
3298#include "pcm_compat.c"
3299#else
3300#define snd_pcm_ioctl_compat NULL
3301#endif
3302
3303/*
3304 * To be removed helpers to keep binary compatibility
3305 */
3306
3307#ifdef CONFIG_SND_SUPPORT_OLD_API
3308#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3309#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3310
3311static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3312 struct snd_pcm_hw_params_old *oparams)
3313{
3314 unsigned int i;
3315
3316 memset(params, 0, sizeof(*params));
3317 params->flags = oparams->flags;
3318 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3319 params->masks[i].bits[0] = oparams->masks[i];
3320 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3321 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3322 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3323 params->info = oparams->info;
3324 params->msbits = oparams->msbits;
3325 params->rate_num = oparams->rate_num;
3326 params->rate_den = oparams->rate_den;
3327 params->fifo_size = oparams->fifo_size;
3328}
3329
3330static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3331 struct snd_pcm_hw_params *params)
3332{
3333 unsigned int i;
3334
3335 memset(oparams, 0, sizeof(*oparams));
3336 oparams->flags = params->flags;
3337 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3338 oparams->masks[i] = params->masks[i].bits[0];
3339 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3340 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3341 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3342 oparams->info = params->info;
3343 oparams->msbits = params->msbits;
3344 oparams->rate_num = params->rate_num;
3345 oparams->rate_den = params->rate_den;
3346 oparams->fifo_size = params->fifo_size;
3347}
3348
3349static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3350 struct snd_pcm_hw_params_old __user * _oparams)
3351{
3352 struct snd_pcm_hw_params *params;
3353 struct snd_pcm_hw_params_old *oparams = NULL;
3354 int err;
3355
3356 params = kmalloc(sizeof(*params), GFP_KERNEL);
3357 if (!params)
3358 return -ENOMEM;
3359
3360 oparams = memdup_user(_oparams, sizeof(*oparams));
3361 if (IS_ERR(oparams)) {
3362 err = PTR_ERR(oparams);
3363 goto out;
3364 }
3365 snd_pcm_hw_convert_from_old_params(params, oparams);
3366 err = snd_pcm_hw_refine(substream, params);
3367 snd_pcm_hw_convert_to_old_params(oparams, params);
3368 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3369 if (!err)
3370 err = -EFAULT;
3371 }
3372
3373 kfree(oparams);
3374out:
3375 kfree(params);
3376 return err;
3377}
3378
3379static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3380 struct snd_pcm_hw_params_old __user * _oparams)
3381{
3382 struct snd_pcm_hw_params *params;
3383 struct snd_pcm_hw_params_old *oparams = NULL;
3384 int err;
3385
3386 params = kmalloc(sizeof(*params), GFP_KERNEL);
3387 if (!params)
3388 return -ENOMEM;
3389
3390 oparams = memdup_user(_oparams, sizeof(*oparams));
3391 if (IS_ERR(oparams)) {
3392 err = PTR_ERR(oparams);
3393 goto out;
3394 }
3395 snd_pcm_hw_convert_from_old_params(params, oparams);
3396 err = snd_pcm_hw_params(substream, params);
3397 snd_pcm_hw_convert_to_old_params(oparams, params);
3398 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3399 if (!err)
3400 err = -EFAULT;
3401 }
3402
3403 kfree(oparams);
3404out:
3405 kfree(params);
3406 return err;
3407}
3408#endif /* CONFIG_SND_SUPPORT_OLD_API */
3409
3410#ifndef CONFIG_MMU
3411static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3412 unsigned long addr,
3413 unsigned long len,
3414 unsigned long pgoff,
3415 unsigned long flags)
3416{
3417 struct snd_pcm_file *pcm_file = file->private_data;
3418 struct snd_pcm_substream *substream = pcm_file->substream;
3419 struct snd_pcm_runtime *runtime = substream->runtime;
3420 unsigned long offset = pgoff << PAGE_SHIFT;
3421
3422 switch (offset) {
3423 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3424 return (unsigned long)runtime->status;
3425 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3426 return (unsigned long)runtime->control;
3427 default:
3428 return (unsigned long)runtime->dma_area + offset;
3429 }
3430}
3431#else
3432# define snd_pcm_get_unmapped_area NULL
3433#endif
3434
3435/*
3436 * Register section
3437 */
3438
3439const struct file_operations snd_pcm_f_ops[2] = {
3440 {
3441 .owner = THIS_MODULE,
3442 .write = snd_pcm_write,
3443 .aio_write = snd_pcm_aio_write,
3444 .open = snd_pcm_playback_open,
3445 .release = snd_pcm_release,
3446 .llseek = no_llseek,
3447 .poll = snd_pcm_playback_poll,
3448 .unlocked_ioctl = snd_pcm_playback_ioctl,
3449 .compat_ioctl = snd_pcm_ioctl_compat,
3450 .mmap = snd_pcm_mmap,
3451 .fasync = snd_pcm_fasync,
3452 .get_unmapped_area = snd_pcm_get_unmapped_area,
3453 },
3454 {
3455 .owner = THIS_MODULE,
3456 .read = snd_pcm_read,
3457 .aio_read = snd_pcm_aio_read,
3458 .open = snd_pcm_capture_open,
3459 .release = snd_pcm_release,
3460 .llseek = no_llseek,
3461 .poll = snd_pcm_capture_poll,
3462 .unlocked_ioctl = snd_pcm_capture_ioctl,
3463 .compat_ioctl = snd_pcm_ioctl_compat,
3464 .mmap = snd_pcm_mmap,
3465 .fasync = snd_pcm_fasync,
3466 .get_unmapped_area = snd_pcm_get_unmapped_area,
3467 }
3468};