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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/compat.h>
8#include <linux/mm.h>
9#include <linux/module.h>
10#include <linux/file.h>
11#include <linux/slab.h>
12#include <linux/sched/signal.h>
13#include <linux/time.h>
14#include <linux/pm_qos.h>
15#include <linux/io.h>
16#include <linux/dma-mapping.h>
17#include <linux/vmalloc.h>
18#include <sound/core.h>
19#include <sound/control.h>
20#include <sound/info.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/timer.h>
24#include <sound/minors.h>
25#include <linux/uio.h>
26#include <linux/delay.h>
27
28#include "pcm_local.h"
29
30#ifdef CONFIG_SND_DEBUG
31#define CREATE_TRACE_POINTS
32#include "pcm_param_trace.h"
33#else
34#define trace_hw_mask_param_enabled() 0
35#define trace_hw_interval_param_enabled() 0
36#define trace_hw_mask_param(substream, type, index, prev, curr)
37#define trace_hw_interval_param(substream, type, index, prev, curr)
38#endif
39
40/*
41 * Compatibility
42 */
43
44struct snd_pcm_hw_params_old {
45 unsigned int flags;
46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
47 SNDRV_PCM_HW_PARAM_ACCESS + 1];
48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
50 unsigned int rmask;
51 unsigned int cmask;
52 unsigned int info;
53 unsigned int msbits;
54 unsigned int rate_num;
55 unsigned int rate_den;
56 snd_pcm_uframes_t fifo_size;
57 unsigned char reserved[64];
58};
59
60#ifdef CONFIG_SND_SUPPORT_OLD_API
61#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
62#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
63
64static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68#endif
69static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
70
71/*
72 *
73 */
74
75static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77void snd_pcm_group_init(struct snd_pcm_group *group)
78{
79 spin_lock_init(&group->lock);
80 mutex_init(&group->mutex);
81 INIT_LIST_HEAD(&group->substreams);
82 refcount_set(&group->refs, 1);
83}
84
85/* define group lock helpers */
86#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
87static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
88{ \
89 if (nonatomic) \
90 mutex_ ## mutex_action(&group->mutex); \
91 else \
92 spin_ ## action(&group->lock); \
93}
94
95DEFINE_PCM_GROUP_LOCK(lock, lock);
96DEFINE_PCM_GROUP_LOCK(unlock, unlock);
97DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
98DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
99
100/**
101 * snd_pcm_stream_lock - Lock the PCM stream
102 * @substream: PCM substream
103 *
104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
105 * flag of the given substream. This also takes the global link rw lock
106 * (or rw sem), too, for avoiding the race with linked streams.
107 */
108void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
109{
110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
111}
112EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
113
114/**
115 * snd_pcm_stream_unlock - Unlock the PCM stream
116 * @substream: PCM substream
117 *
118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
119 */
120void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
121{
122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
123}
124EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
125
126/**
127 * snd_pcm_stream_lock_irq - Lock the PCM stream
128 * @substream: PCM substream
129 *
130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
132 * as snd_pcm_stream_lock().
133 */
134void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
135{
136 snd_pcm_group_lock_irq(&substream->self_group,
137 substream->pcm->nonatomic);
138}
139EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
140
141static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
142{
143 struct snd_pcm_group *group = &substream->self_group;
144
145 if (substream->pcm->nonatomic)
146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
147 else
148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
149}
150
151/**
152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
153 * @substream: PCM substream
154 *
155 * This is a counter-part of snd_pcm_stream_lock_irq().
156 */
157void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
158{
159 snd_pcm_group_unlock_irq(&substream->self_group,
160 substream->pcm->nonatomic);
161}
162EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
163
164unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
165{
166 unsigned long flags = 0;
167 if (substream->pcm->nonatomic)
168 mutex_lock(&substream->self_group.mutex);
169 else
170 spin_lock_irqsave(&substream->self_group.lock, flags);
171 return flags;
172}
173EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
174
175unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
176{
177 unsigned long flags = 0;
178 if (substream->pcm->nonatomic)
179 mutex_lock_nested(&substream->self_group.mutex,
180 SINGLE_DEPTH_NESTING);
181 else
182 spin_lock_irqsave_nested(&substream->self_group.lock, flags,
183 SINGLE_DEPTH_NESTING);
184 return flags;
185}
186EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
187
188/**
189 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
190 * @substream: PCM substream
191 * @flags: irq flags
192 *
193 * This is a counter-part of snd_pcm_stream_lock_irqsave().
194 */
195void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
196 unsigned long flags)
197{
198 if (substream->pcm->nonatomic)
199 mutex_unlock(&substream->self_group.mutex);
200 else
201 spin_unlock_irqrestore(&substream->self_group.lock, flags);
202}
203EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
204
205/* Run PCM ioctl ops */
206static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
207 unsigned cmd, void *arg)
208{
209 if (substream->ops->ioctl)
210 return substream->ops->ioctl(substream, cmd, arg);
211 else
212 return snd_pcm_lib_ioctl(substream, cmd, arg);
213}
214
215int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
216{
217 struct snd_pcm *pcm = substream->pcm;
218 struct snd_pcm_str *pstr = substream->pstr;
219
220 memset(info, 0, sizeof(*info));
221 info->card = pcm->card->number;
222 info->device = pcm->device;
223 info->stream = substream->stream;
224 info->subdevice = substream->number;
225 strscpy(info->id, pcm->id, sizeof(info->id));
226 strscpy(info->name, pcm->name, sizeof(info->name));
227 info->dev_class = pcm->dev_class;
228 info->dev_subclass = pcm->dev_subclass;
229 info->subdevices_count = pstr->substream_count;
230 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
231 strscpy(info->subname, substream->name, sizeof(info->subname));
232
233 return 0;
234}
235
236int snd_pcm_info_user(struct snd_pcm_substream *substream,
237 struct snd_pcm_info __user * _info)
238{
239 struct snd_pcm_info *info;
240 int err;
241
242 info = kmalloc(sizeof(*info), GFP_KERNEL);
243 if (! info)
244 return -ENOMEM;
245 err = snd_pcm_info(substream, info);
246 if (err >= 0) {
247 if (copy_to_user(_info, info, sizeof(*info)))
248 err = -EFAULT;
249 }
250 kfree(info);
251 return err;
252}
253
254/* macro for simplified cast */
255#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
256
257static bool hw_support_mmap(struct snd_pcm_substream *substream)
258{
259 struct snd_dma_buffer *dmabuf;
260
261 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
262 return false;
263
264 if (substream->ops->mmap || substream->ops->page)
265 return true;
266
267 dmabuf = snd_pcm_get_dma_buf(substream);
268 if (!dmabuf)
269 dmabuf = &substream->dma_buffer;
270 switch (dmabuf->dev.type) {
271 case SNDRV_DMA_TYPE_UNKNOWN:
272 /* we can't know the device, so just assume that the driver does
273 * everything right
274 */
275 return true;
276 case SNDRV_DMA_TYPE_CONTINUOUS:
277 case SNDRV_DMA_TYPE_VMALLOC:
278 return true;
279 default:
280 return dma_can_mmap(dmabuf->dev.dev);
281 }
282}
283
284static int constrain_mask_params(struct snd_pcm_substream *substream,
285 struct snd_pcm_hw_params *params)
286{
287 struct snd_pcm_hw_constraints *constrs =
288 &substream->runtime->hw_constraints;
289 struct snd_mask *m;
290 unsigned int k;
291 struct snd_mask old_mask __maybe_unused;
292 int changed;
293
294 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
295 m = hw_param_mask(params, k);
296 if (snd_mask_empty(m))
297 return -EINVAL;
298
299 /* This parameter is not requested to change by a caller. */
300 if (!(params->rmask & PARAM_MASK_BIT(k)))
301 continue;
302
303 if (trace_hw_mask_param_enabled())
304 old_mask = *m;
305
306 changed = snd_mask_refine(m, constrs_mask(constrs, k));
307 if (changed < 0)
308 return changed;
309 if (changed == 0)
310 continue;
311
312 /* Set corresponding flag so that the caller gets it. */
313 trace_hw_mask_param(substream, k, 0, &old_mask, m);
314 params->cmask |= PARAM_MASK_BIT(k);
315 }
316
317 return 0;
318}
319
320static int constrain_interval_params(struct snd_pcm_substream *substream,
321 struct snd_pcm_hw_params *params)
322{
323 struct snd_pcm_hw_constraints *constrs =
324 &substream->runtime->hw_constraints;
325 struct snd_interval *i;
326 unsigned int k;
327 struct snd_interval old_interval __maybe_unused;
328 int changed;
329
330 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
331 i = hw_param_interval(params, k);
332 if (snd_interval_empty(i))
333 return -EINVAL;
334
335 /* This parameter is not requested to change by a caller. */
336 if (!(params->rmask & PARAM_MASK_BIT(k)))
337 continue;
338
339 if (trace_hw_interval_param_enabled())
340 old_interval = *i;
341
342 changed = snd_interval_refine(i, constrs_interval(constrs, k));
343 if (changed < 0)
344 return changed;
345 if (changed == 0)
346 continue;
347
348 /* Set corresponding flag so that the caller gets it. */
349 trace_hw_interval_param(substream, k, 0, &old_interval, i);
350 params->cmask |= PARAM_MASK_BIT(k);
351 }
352
353 return 0;
354}
355
356static int constrain_params_by_rules(struct snd_pcm_substream *substream,
357 struct snd_pcm_hw_params *params)
358{
359 struct snd_pcm_hw_constraints *constrs =
360 &substream->runtime->hw_constraints;
361 unsigned int k;
362 unsigned int *rstamps;
363 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
364 unsigned int stamp;
365 struct snd_pcm_hw_rule *r;
366 unsigned int d;
367 struct snd_mask old_mask __maybe_unused;
368 struct snd_interval old_interval __maybe_unused;
369 bool again;
370 int changed, err = 0;
371
372 /*
373 * Each application of rule has own sequence number.
374 *
375 * Each member of 'rstamps' array represents the sequence number of
376 * recent application of corresponding rule.
377 */
378 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
379 if (!rstamps)
380 return -ENOMEM;
381
382 /*
383 * Each member of 'vstamps' array represents the sequence number of
384 * recent application of rule in which corresponding parameters were
385 * changed.
386 *
387 * In initial state, elements corresponding to parameters requested by
388 * a caller is 1. For unrequested parameters, corresponding members
389 * have 0 so that the parameters are never changed anymore.
390 */
391 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
392 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
393
394 /* Due to the above design, actual sequence number starts at 2. */
395 stamp = 2;
396retry:
397 /* Apply all rules in order. */
398 again = false;
399 for (k = 0; k < constrs->rules_num; k++) {
400 r = &constrs->rules[k];
401
402 /*
403 * Check condition bits of this rule. When the rule has
404 * some condition bits, parameter without the bits is
405 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
406 * is an example of the condition bits.
407 */
408 if (r->cond && !(r->cond & params->flags))
409 continue;
410
411 /*
412 * The 'deps' array includes maximum four dependencies
413 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
414 * member of this array is a sentinel and should be
415 * negative value.
416 *
417 * This rule should be processed in this time when dependent
418 * parameters were changed at former applications of the other
419 * rules.
420 */
421 for (d = 0; r->deps[d] >= 0; d++) {
422 if (vstamps[r->deps[d]] > rstamps[k])
423 break;
424 }
425 if (r->deps[d] < 0)
426 continue;
427
428 if (trace_hw_mask_param_enabled()) {
429 if (hw_is_mask(r->var))
430 old_mask = *hw_param_mask(params, r->var);
431 }
432 if (trace_hw_interval_param_enabled()) {
433 if (hw_is_interval(r->var))
434 old_interval = *hw_param_interval(params, r->var);
435 }
436
437 changed = r->func(params, r);
438 if (changed < 0) {
439 err = changed;
440 goto out;
441 }
442
443 /*
444 * When the parameter is changed, notify it to the caller
445 * by corresponding returned bit, then preparing for next
446 * iteration.
447 */
448 if (changed && r->var >= 0) {
449 if (hw_is_mask(r->var)) {
450 trace_hw_mask_param(substream, r->var,
451 k + 1, &old_mask,
452 hw_param_mask(params, r->var));
453 }
454 if (hw_is_interval(r->var)) {
455 trace_hw_interval_param(substream, r->var,
456 k + 1, &old_interval,
457 hw_param_interval(params, r->var));
458 }
459
460 params->cmask |= PARAM_MASK_BIT(r->var);
461 vstamps[r->var] = stamp;
462 again = true;
463 }
464
465 rstamps[k] = stamp++;
466 }
467
468 /* Iterate to evaluate all rules till no parameters are changed. */
469 if (again)
470 goto retry;
471
472 out:
473 kfree(rstamps);
474 return err;
475}
476
477static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
478 struct snd_pcm_hw_params *params)
479{
480 const struct snd_interval *i;
481 const struct snd_mask *m;
482 int err;
483
484 if (!params->msbits) {
485 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
486 if (snd_interval_single(i))
487 params->msbits = snd_interval_value(i);
488 }
489
490 if (!params->rate_den) {
491 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
492 if (snd_interval_single(i)) {
493 params->rate_num = snd_interval_value(i);
494 params->rate_den = 1;
495 }
496 }
497
498 if (!params->fifo_size) {
499 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
500 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
501 if (snd_mask_single(m) && snd_interval_single(i)) {
502 err = snd_pcm_ops_ioctl(substream,
503 SNDRV_PCM_IOCTL1_FIFO_SIZE,
504 params);
505 if (err < 0)
506 return err;
507 }
508 }
509
510 if (!params->info) {
511 params->info = substream->runtime->hw.info;
512 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
513 SNDRV_PCM_INFO_DRAIN_TRIGGER);
514 if (!hw_support_mmap(substream))
515 params->info &= ~(SNDRV_PCM_INFO_MMAP |
516 SNDRV_PCM_INFO_MMAP_VALID);
517 }
518
519 return 0;
520}
521
522int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
523 struct snd_pcm_hw_params *params)
524{
525 int err;
526
527 params->info = 0;
528 params->fifo_size = 0;
529 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
530 params->msbits = 0;
531 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
532 params->rate_num = 0;
533 params->rate_den = 0;
534 }
535
536 err = constrain_mask_params(substream, params);
537 if (err < 0)
538 return err;
539
540 err = constrain_interval_params(substream, params);
541 if (err < 0)
542 return err;
543
544 err = constrain_params_by_rules(substream, params);
545 if (err < 0)
546 return err;
547
548 params->rmask = 0;
549
550 return 0;
551}
552EXPORT_SYMBOL(snd_pcm_hw_refine);
553
554static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
555 struct snd_pcm_hw_params __user * _params)
556{
557 struct snd_pcm_hw_params *params;
558 int err;
559
560 params = memdup_user(_params, sizeof(*params));
561 if (IS_ERR(params))
562 return PTR_ERR(params);
563
564 err = snd_pcm_hw_refine(substream, params);
565 if (err < 0)
566 goto end;
567
568 err = fixup_unreferenced_params(substream, params);
569 if (err < 0)
570 goto end;
571
572 if (copy_to_user(_params, params, sizeof(*params)))
573 err = -EFAULT;
574end:
575 kfree(params);
576 return err;
577}
578
579static int period_to_usecs(struct snd_pcm_runtime *runtime)
580{
581 int usecs;
582
583 if (! runtime->rate)
584 return -1; /* invalid */
585
586 /* take 75% of period time as the deadline */
587 usecs = (750000 / runtime->rate) * runtime->period_size;
588 usecs += ((750000 % runtime->rate) * runtime->period_size) /
589 runtime->rate;
590
591 return usecs;
592}
593
594static void snd_pcm_set_state(struct snd_pcm_substream *substream,
595 snd_pcm_state_t state)
596{
597 snd_pcm_stream_lock_irq(substream);
598 if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
599 __snd_pcm_set_state(substream->runtime, state);
600 snd_pcm_stream_unlock_irq(substream);
601}
602
603static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
604 int event)
605{
606#ifdef CONFIG_SND_PCM_TIMER
607 if (substream->timer)
608 snd_timer_notify(substream->timer, event,
609 &substream->runtime->trigger_tstamp);
610#endif
611}
612
613void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
614{
615 if (substream->runtime && substream->runtime->stop_operating) {
616 substream->runtime->stop_operating = false;
617 if (substream->ops && substream->ops->sync_stop)
618 substream->ops->sync_stop(substream);
619 else if (sync_irq && substream->pcm->card->sync_irq > 0)
620 synchronize_irq(substream->pcm->card->sync_irq);
621 }
622}
623
624/**
625 * snd_pcm_hw_params_choose - choose a configuration defined by @params
626 * @pcm: PCM instance
627 * @params: the hw_params instance
628 *
629 * Choose one configuration from configuration space defined by @params.
630 * The configuration chosen is that obtained fixing in this order:
631 * first access, first format, first subformat, min channels,
632 * min rate, min period time, max buffer size, min tick time
633 *
634 * Return: Zero if successful, or a negative error code on failure.
635 */
636static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
637 struct snd_pcm_hw_params *params)
638{
639 static const int vars[] = {
640 SNDRV_PCM_HW_PARAM_ACCESS,
641 SNDRV_PCM_HW_PARAM_FORMAT,
642 SNDRV_PCM_HW_PARAM_SUBFORMAT,
643 SNDRV_PCM_HW_PARAM_CHANNELS,
644 SNDRV_PCM_HW_PARAM_RATE,
645 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
646 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
647 SNDRV_PCM_HW_PARAM_TICK_TIME,
648 -1
649 };
650 const int *v;
651 struct snd_mask old_mask __maybe_unused;
652 struct snd_interval old_interval __maybe_unused;
653 int changed;
654
655 for (v = vars; *v != -1; v++) {
656 /* Keep old parameter to trace. */
657 if (trace_hw_mask_param_enabled()) {
658 if (hw_is_mask(*v))
659 old_mask = *hw_param_mask(params, *v);
660 }
661 if (trace_hw_interval_param_enabled()) {
662 if (hw_is_interval(*v))
663 old_interval = *hw_param_interval(params, *v);
664 }
665 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
666 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
667 else
668 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
669 if (changed < 0)
670 return changed;
671 if (changed == 0)
672 continue;
673
674 /* Trace the changed parameter. */
675 if (hw_is_mask(*v)) {
676 trace_hw_mask_param(pcm, *v, 0, &old_mask,
677 hw_param_mask(params, *v));
678 }
679 if (hw_is_interval(*v)) {
680 trace_hw_interval_param(pcm, *v, 0, &old_interval,
681 hw_param_interval(params, *v));
682 }
683 }
684
685 return 0;
686}
687
688/* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
689 * block the further r/w operations
690 */
691static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
692{
693 if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
694 return -EBUSY;
695 mutex_lock(&runtime->buffer_mutex);
696 return 0; /* keep buffer_mutex, unlocked by below */
697}
698
699/* release buffer_mutex and clear r/w access flag */
700static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
701{
702 mutex_unlock(&runtime->buffer_mutex);
703 atomic_inc(&runtime->buffer_accessing);
704}
705
706#if IS_ENABLED(CONFIG_SND_PCM_OSS)
707#define is_oss_stream(substream) ((substream)->oss.oss)
708#else
709#define is_oss_stream(substream) false
710#endif
711
712static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
713 struct snd_pcm_hw_params *params)
714{
715 struct snd_pcm_runtime *runtime;
716 int err, usecs;
717 unsigned int bits;
718 snd_pcm_uframes_t frames;
719
720 if (PCM_RUNTIME_CHECK(substream))
721 return -ENXIO;
722 runtime = substream->runtime;
723 err = snd_pcm_buffer_access_lock(runtime);
724 if (err < 0)
725 return err;
726 snd_pcm_stream_lock_irq(substream);
727 switch (runtime->state) {
728 case SNDRV_PCM_STATE_OPEN:
729 case SNDRV_PCM_STATE_SETUP:
730 case SNDRV_PCM_STATE_PREPARED:
731 if (!is_oss_stream(substream) &&
732 atomic_read(&substream->mmap_count))
733 err = -EBADFD;
734 break;
735 default:
736 err = -EBADFD;
737 break;
738 }
739 snd_pcm_stream_unlock_irq(substream);
740 if (err)
741 goto unlock;
742
743 snd_pcm_sync_stop(substream, true);
744
745 params->rmask = ~0U;
746 err = snd_pcm_hw_refine(substream, params);
747 if (err < 0)
748 goto _error;
749
750 err = snd_pcm_hw_params_choose(substream, params);
751 if (err < 0)
752 goto _error;
753
754 err = fixup_unreferenced_params(substream, params);
755 if (err < 0)
756 goto _error;
757
758 if (substream->managed_buffer_alloc) {
759 err = snd_pcm_lib_malloc_pages(substream,
760 params_buffer_bytes(params));
761 if (err < 0)
762 goto _error;
763 runtime->buffer_changed = err > 0;
764 }
765
766 if (substream->ops->hw_params != NULL) {
767 err = substream->ops->hw_params(substream, params);
768 if (err < 0)
769 goto _error;
770 }
771
772 runtime->access = params_access(params);
773 runtime->format = params_format(params);
774 runtime->subformat = params_subformat(params);
775 runtime->channels = params_channels(params);
776 runtime->rate = params_rate(params);
777 runtime->period_size = params_period_size(params);
778 runtime->periods = params_periods(params);
779 runtime->buffer_size = params_buffer_size(params);
780 runtime->info = params->info;
781 runtime->rate_num = params->rate_num;
782 runtime->rate_den = params->rate_den;
783 runtime->no_period_wakeup =
784 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
785 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
786
787 bits = snd_pcm_format_physical_width(runtime->format);
788 runtime->sample_bits = bits;
789 bits *= runtime->channels;
790 runtime->frame_bits = bits;
791 frames = 1;
792 while (bits % 8 != 0) {
793 bits *= 2;
794 frames *= 2;
795 }
796 runtime->byte_align = bits / 8;
797 runtime->min_align = frames;
798
799 /* Default sw params */
800 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
801 runtime->period_step = 1;
802 runtime->control->avail_min = runtime->period_size;
803 runtime->start_threshold = 1;
804 runtime->stop_threshold = runtime->buffer_size;
805 runtime->silence_threshold = 0;
806 runtime->silence_size = 0;
807 runtime->boundary = runtime->buffer_size;
808 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
809 runtime->boundary *= 2;
810
811 /* clear the buffer for avoiding possible kernel info leaks */
812 if (runtime->dma_area && !substream->ops->copy_user) {
813 size_t size = runtime->dma_bytes;
814
815 if (runtime->info & SNDRV_PCM_INFO_MMAP)
816 size = PAGE_ALIGN(size);
817 memset(runtime->dma_area, 0, size);
818 }
819
820 snd_pcm_timer_resolution_change(substream);
821 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
822
823 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
824 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
825 usecs = period_to_usecs(runtime);
826 if (usecs >= 0)
827 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
828 usecs);
829 err = 0;
830 _error:
831 if (err) {
832 /* hardware might be unusable from this time,
833 * so we force application to retry to set
834 * the correct hardware parameter settings
835 */
836 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
837 if (substream->ops->hw_free != NULL)
838 substream->ops->hw_free(substream);
839 if (substream->managed_buffer_alloc)
840 snd_pcm_lib_free_pages(substream);
841 }
842 unlock:
843 snd_pcm_buffer_access_unlock(runtime);
844 return err;
845}
846
847static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
848 struct snd_pcm_hw_params __user * _params)
849{
850 struct snd_pcm_hw_params *params;
851 int err;
852
853 params = memdup_user(_params, sizeof(*params));
854 if (IS_ERR(params))
855 return PTR_ERR(params);
856
857 err = snd_pcm_hw_params(substream, params);
858 if (err < 0)
859 goto end;
860
861 if (copy_to_user(_params, params, sizeof(*params)))
862 err = -EFAULT;
863end:
864 kfree(params);
865 return err;
866}
867
868static int do_hw_free(struct snd_pcm_substream *substream)
869{
870 int result = 0;
871
872 snd_pcm_sync_stop(substream, true);
873 if (substream->ops->hw_free)
874 result = substream->ops->hw_free(substream);
875 if (substream->managed_buffer_alloc)
876 snd_pcm_lib_free_pages(substream);
877 return result;
878}
879
880static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
881{
882 struct snd_pcm_runtime *runtime;
883 int result = 0;
884
885 if (PCM_RUNTIME_CHECK(substream))
886 return -ENXIO;
887 runtime = substream->runtime;
888 result = snd_pcm_buffer_access_lock(runtime);
889 if (result < 0)
890 return result;
891 snd_pcm_stream_lock_irq(substream);
892 switch (runtime->state) {
893 case SNDRV_PCM_STATE_SETUP:
894 case SNDRV_PCM_STATE_PREPARED:
895 if (atomic_read(&substream->mmap_count))
896 result = -EBADFD;
897 break;
898 default:
899 result = -EBADFD;
900 break;
901 }
902 snd_pcm_stream_unlock_irq(substream);
903 if (result)
904 goto unlock;
905 result = do_hw_free(substream);
906 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
907 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
908 unlock:
909 snd_pcm_buffer_access_unlock(runtime);
910 return result;
911}
912
913static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
914 struct snd_pcm_sw_params *params)
915{
916 struct snd_pcm_runtime *runtime;
917 int err;
918
919 if (PCM_RUNTIME_CHECK(substream))
920 return -ENXIO;
921 runtime = substream->runtime;
922 snd_pcm_stream_lock_irq(substream);
923 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
924 snd_pcm_stream_unlock_irq(substream);
925 return -EBADFD;
926 }
927 snd_pcm_stream_unlock_irq(substream);
928
929 if (params->tstamp_mode < 0 ||
930 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
931 return -EINVAL;
932 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
933 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
934 return -EINVAL;
935 if (params->avail_min == 0)
936 return -EINVAL;
937 if (params->silence_size >= runtime->boundary) {
938 if (params->silence_threshold != 0)
939 return -EINVAL;
940 } else {
941 if (params->silence_size > params->silence_threshold)
942 return -EINVAL;
943 if (params->silence_threshold > runtime->buffer_size)
944 return -EINVAL;
945 }
946 err = 0;
947 snd_pcm_stream_lock_irq(substream);
948 runtime->tstamp_mode = params->tstamp_mode;
949 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
950 runtime->tstamp_type = params->tstamp_type;
951 runtime->period_step = params->period_step;
952 runtime->control->avail_min = params->avail_min;
953 runtime->start_threshold = params->start_threshold;
954 runtime->stop_threshold = params->stop_threshold;
955 runtime->silence_threshold = params->silence_threshold;
956 runtime->silence_size = params->silence_size;
957 params->boundary = runtime->boundary;
958 if (snd_pcm_running(substream)) {
959 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
960 runtime->silence_size > 0)
961 snd_pcm_playback_silence(substream, ULONG_MAX);
962 err = snd_pcm_update_state(substream, runtime);
963 }
964 snd_pcm_stream_unlock_irq(substream);
965 return err;
966}
967
968static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
969 struct snd_pcm_sw_params __user * _params)
970{
971 struct snd_pcm_sw_params params;
972 int err;
973 if (copy_from_user(¶ms, _params, sizeof(params)))
974 return -EFAULT;
975 err = snd_pcm_sw_params(substream, ¶ms);
976 if (copy_to_user(_params, ¶ms, sizeof(params)))
977 return -EFAULT;
978 return err;
979}
980
981static inline snd_pcm_uframes_t
982snd_pcm_calc_delay(struct snd_pcm_substream *substream)
983{
984 snd_pcm_uframes_t delay;
985
986 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
987 delay = snd_pcm_playback_hw_avail(substream->runtime);
988 else
989 delay = snd_pcm_capture_avail(substream->runtime);
990 return delay + substream->runtime->delay;
991}
992
993int snd_pcm_status64(struct snd_pcm_substream *substream,
994 struct snd_pcm_status64 *status)
995{
996 struct snd_pcm_runtime *runtime = substream->runtime;
997
998 snd_pcm_stream_lock_irq(substream);
999
1000 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1001 &runtime->audio_tstamp_config);
1002
1003 /* backwards compatible behavior */
1004 if (runtime->audio_tstamp_config.type_requested ==
1005 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1006 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1007 runtime->audio_tstamp_config.type_requested =
1008 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1009 else
1010 runtime->audio_tstamp_config.type_requested =
1011 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1012 runtime->audio_tstamp_report.valid = 0;
1013 } else
1014 runtime->audio_tstamp_report.valid = 1;
1015
1016 status->state = runtime->state;
1017 status->suspended_state = runtime->suspended_state;
1018 if (status->state == SNDRV_PCM_STATE_OPEN)
1019 goto _end;
1020 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1021 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1022 if (snd_pcm_running(substream)) {
1023 snd_pcm_update_hw_ptr(substream);
1024 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1025 status->tstamp_sec = runtime->status->tstamp.tv_sec;
1026 status->tstamp_nsec =
1027 runtime->status->tstamp.tv_nsec;
1028 status->driver_tstamp_sec =
1029 runtime->driver_tstamp.tv_sec;
1030 status->driver_tstamp_nsec =
1031 runtime->driver_tstamp.tv_nsec;
1032 status->audio_tstamp_sec =
1033 runtime->status->audio_tstamp.tv_sec;
1034 status->audio_tstamp_nsec =
1035 runtime->status->audio_tstamp.tv_nsec;
1036 if (runtime->audio_tstamp_report.valid == 1)
1037 /* backwards compatibility, no report provided in COMPAT mode */
1038 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1039 &status->audio_tstamp_accuracy,
1040 &runtime->audio_tstamp_report);
1041
1042 goto _tstamp_end;
1043 }
1044 } else {
1045 /* get tstamp only in fallback mode and only if enabled */
1046 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1047 struct timespec64 tstamp;
1048
1049 snd_pcm_gettime(runtime, &tstamp);
1050 status->tstamp_sec = tstamp.tv_sec;
1051 status->tstamp_nsec = tstamp.tv_nsec;
1052 }
1053 }
1054 _tstamp_end:
1055 status->appl_ptr = runtime->control->appl_ptr;
1056 status->hw_ptr = runtime->status->hw_ptr;
1057 status->avail = snd_pcm_avail(substream);
1058 status->delay = snd_pcm_running(substream) ?
1059 snd_pcm_calc_delay(substream) : 0;
1060 status->avail_max = runtime->avail_max;
1061 status->overrange = runtime->overrange;
1062 runtime->avail_max = 0;
1063 runtime->overrange = 0;
1064 _end:
1065 snd_pcm_stream_unlock_irq(substream);
1066 return 0;
1067}
1068
1069static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1070 struct snd_pcm_status64 __user * _status,
1071 bool ext)
1072{
1073 struct snd_pcm_status64 status;
1074 int res;
1075
1076 memset(&status, 0, sizeof(status));
1077 /*
1078 * with extension, parameters are read/write,
1079 * get audio_tstamp_data from user,
1080 * ignore rest of status structure
1081 */
1082 if (ext && get_user(status.audio_tstamp_data,
1083 (u32 __user *)(&_status->audio_tstamp_data)))
1084 return -EFAULT;
1085 res = snd_pcm_status64(substream, &status);
1086 if (res < 0)
1087 return res;
1088 if (copy_to_user(_status, &status, sizeof(status)))
1089 return -EFAULT;
1090 return 0;
1091}
1092
1093static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1094 struct snd_pcm_status32 __user * _status,
1095 bool ext)
1096{
1097 struct snd_pcm_status64 status64;
1098 struct snd_pcm_status32 status32;
1099 int res;
1100
1101 memset(&status64, 0, sizeof(status64));
1102 memset(&status32, 0, sizeof(status32));
1103 /*
1104 * with extension, parameters are read/write,
1105 * get audio_tstamp_data from user,
1106 * ignore rest of status structure
1107 */
1108 if (ext && get_user(status64.audio_tstamp_data,
1109 (u32 __user *)(&_status->audio_tstamp_data)))
1110 return -EFAULT;
1111 res = snd_pcm_status64(substream, &status64);
1112 if (res < 0)
1113 return res;
1114
1115 status32 = (struct snd_pcm_status32) {
1116 .state = status64.state,
1117 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1118 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1119 .tstamp_sec = status64.tstamp_sec,
1120 .tstamp_nsec = status64.tstamp_nsec,
1121 .appl_ptr = status64.appl_ptr,
1122 .hw_ptr = status64.hw_ptr,
1123 .delay = status64.delay,
1124 .avail = status64.avail,
1125 .avail_max = status64.avail_max,
1126 .overrange = status64.overrange,
1127 .suspended_state = status64.suspended_state,
1128 .audio_tstamp_data = status64.audio_tstamp_data,
1129 .audio_tstamp_sec = status64.audio_tstamp_sec,
1130 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1131 .driver_tstamp_sec = status64.audio_tstamp_sec,
1132 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1133 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1134 };
1135
1136 if (copy_to_user(_status, &status32, sizeof(status32)))
1137 return -EFAULT;
1138
1139 return 0;
1140}
1141
1142static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1143 struct snd_pcm_channel_info * info)
1144{
1145 struct snd_pcm_runtime *runtime;
1146 unsigned int channel;
1147
1148 channel = info->channel;
1149 runtime = substream->runtime;
1150 snd_pcm_stream_lock_irq(substream);
1151 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
1152 snd_pcm_stream_unlock_irq(substream);
1153 return -EBADFD;
1154 }
1155 snd_pcm_stream_unlock_irq(substream);
1156 if (channel >= runtime->channels)
1157 return -EINVAL;
1158 memset(info, 0, sizeof(*info));
1159 info->channel = channel;
1160 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1161}
1162
1163static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1164 struct snd_pcm_channel_info __user * _info)
1165{
1166 struct snd_pcm_channel_info info;
1167 int res;
1168
1169 if (copy_from_user(&info, _info, sizeof(info)))
1170 return -EFAULT;
1171 res = snd_pcm_channel_info(substream, &info);
1172 if (res < 0)
1173 return res;
1174 if (copy_to_user(_info, &info, sizeof(info)))
1175 return -EFAULT;
1176 return 0;
1177}
1178
1179static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1180{
1181 struct snd_pcm_runtime *runtime = substream->runtime;
1182 if (runtime->trigger_master == NULL)
1183 return;
1184 if (runtime->trigger_master == substream) {
1185 if (!runtime->trigger_tstamp_latched)
1186 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1187 } else {
1188 snd_pcm_trigger_tstamp(runtime->trigger_master);
1189 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1190 }
1191 runtime->trigger_master = NULL;
1192}
1193
1194#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
1195
1196struct action_ops {
1197 int (*pre_action)(struct snd_pcm_substream *substream,
1198 snd_pcm_state_t state);
1199 int (*do_action)(struct snd_pcm_substream *substream,
1200 snd_pcm_state_t state);
1201 void (*undo_action)(struct snd_pcm_substream *substream,
1202 snd_pcm_state_t state);
1203 void (*post_action)(struct snd_pcm_substream *substream,
1204 snd_pcm_state_t state);
1205};
1206
1207/*
1208 * this functions is core for handling of linked stream
1209 * Note: the stream state might be changed also on failure
1210 * Note2: call with calling stream lock + link lock
1211 */
1212static int snd_pcm_action_group(const struct action_ops *ops,
1213 struct snd_pcm_substream *substream,
1214 snd_pcm_state_t state,
1215 bool stream_lock)
1216{
1217 struct snd_pcm_substream *s = NULL;
1218 struct snd_pcm_substream *s1;
1219 int res = 0, depth = 1;
1220
1221 snd_pcm_group_for_each_entry(s, substream) {
1222 if (s != substream) {
1223 if (!stream_lock)
1224 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1225 else if (s->pcm->nonatomic)
1226 mutex_lock_nested(&s->self_group.mutex, depth);
1227 else
1228 spin_lock_nested(&s->self_group.lock, depth);
1229 depth++;
1230 }
1231 res = ops->pre_action(s, state);
1232 if (res < 0)
1233 goto _unlock;
1234 }
1235 snd_pcm_group_for_each_entry(s, substream) {
1236 res = ops->do_action(s, state);
1237 if (res < 0) {
1238 if (ops->undo_action) {
1239 snd_pcm_group_for_each_entry(s1, substream) {
1240 if (s1 == s) /* failed stream */
1241 break;
1242 ops->undo_action(s1, state);
1243 }
1244 }
1245 s = NULL; /* unlock all */
1246 goto _unlock;
1247 }
1248 }
1249 snd_pcm_group_for_each_entry(s, substream) {
1250 ops->post_action(s, state);
1251 }
1252 _unlock:
1253 /* unlock streams */
1254 snd_pcm_group_for_each_entry(s1, substream) {
1255 if (s1 != substream) {
1256 if (!stream_lock)
1257 mutex_unlock(&s1->runtime->buffer_mutex);
1258 else if (s1->pcm->nonatomic)
1259 mutex_unlock(&s1->self_group.mutex);
1260 else
1261 spin_unlock(&s1->self_group.lock);
1262 }
1263 if (s1 == s) /* end */
1264 break;
1265 }
1266 return res;
1267}
1268
1269/*
1270 * Note: call with stream lock
1271 */
1272static int snd_pcm_action_single(const struct action_ops *ops,
1273 struct snd_pcm_substream *substream,
1274 snd_pcm_state_t state)
1275{
1276 int res;
1277
1278 res = ops->pre_action(substream, state);
1279 if (res < 0)
1280 return res;
1281 res = ops->do_action(substream, state);
1282 if (res == 0)
1283 ops->post_action(substream, state);
1284 else if (ops->undo_action)
1285 ops->undo_action(substream, state);
1286 return res;
1287}
1288
1289static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1290 struct snd_pcm_group *new_group)
1291{
1292 substream->group = new_group;
1293 list_move(&substream->link_list, &new_group->substreams);
1294}
1295
1296/*
1297 * Unref and unlock the group, but keep the stream lock;
1298 * when the group becomes empty and no longer referred, destroy itself
1299 */
1300static void snd_pcm_group_unref(struct snd_pcm_group *group,
1301 struct snd_pcm_substream *substream)
1302{
1303 bool do_free;
1304
1305 if (!group)
1306 return;
1307 do_free = refcount_dec_and_test(&group->refs);
1308 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1309 if (do_free)
1310 kfree(group);
1311}
1312
1313/*
1314 * Lock the group inside a stream lock and reference it;
1315 * return the locked group object, or NULL if not linked
1316 */
1317static struct snd_pcm_group *
1318snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1319{
1320 bool nonatomic = substream->pcm->nonatomic;
1321 struct snd_pcm_group *group;
1322 bool trylock;
1323
1324 for (;;) {
1325 if (!snd_pcm_stream_linked(substream))
1326 return NULL;
1327 group = substream->group;
1328 /* block freeing the group object */
1329 refcount_inc(&group->refs);
1330
1331 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1332 spin_trylock(&group->lock);
1333 if (trylock)
1334 break; /* OK */
1335
1336 /* re-lock for avoiding ABBA deadlock */
1337 snd_pcm_stream_unlock(substream);
1338 snd_pcm_group_lock(group, nonatomic);
1339 snd_pcm_stream_lock(substream);
1340
1341 /* check the group again; the above opens a small race window */
1342 if (substream->group == group)
1343 break; /* OK */
1344 /* group changed, try again */
1345 snd_pcm_group_unref(group, substream);
1346 }
1347 return group;
1348}
1349
1350/*
1351 * Note: call with stream lock
1352 */
1353static int snd_pcm_action(const struct action_ops *ops,
1354 struct snd_pcm_substream *substream,
1355 snd_pcm_state_t state)
1356{
1357 struct snd_pcm_group *group;
1358 int res;
1359
1360 group = snd_pcm_stream_group_ref(substream);
1361 if (group)
1362 res = snd_pcm_action_group(ops, substream, state, true);
1363 else
1364 res = snd_pcm_action_single(ops, substream, state);
1365 snd_pcm_group_unref(group, substream);
1366 return res;
1367}
1368
1369/*
1370 * Note: don't use any locks before
1371 */
1372static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1373 struct snd_pcm_substream *substream,
1374 snd_pcm_state_t state)
1375{
1376 int res;
1377
1378 snd_pcm_stream_lock_irq(substream);
1379 res = snd_pcm_action(ops, substream, state);
1380 snd_pcm_stream_unlock_irq(substream);
1381 return res;
1382}
1383
1384/*
1385 */
1386static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1387 struct snd_pcm_substream *substream,
1388 snd_pcm_state_t state)
1389{
1390 int res;
1391
1392 /* Guarantee the group members won't change during non-atomic action */
1393 down_read(&snd_pcm_link_rwsem);
1394 res = snd_pcm_buffer_access_lock(substream->runtime);
1395 if (res < 0)
1396 goto unlock;
1397 if (snd_pcm_stream_linked(substream))
1398 res = snd_pcm_action_group(ops, substream, state, false);
1399 else
1400 res = snd_pcm_action_single(ops, substream, state);
1401 snd_pcm_buffer_access_unlock(substream->runtime);
1402 unlock:
1403 up_read(&snd_pcm_link_rwsem);
1404 return res;
1405}
1406
1407/*
1408 * start callbacks
1409 */
1410static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1411 snd_pcm_state_t state)
1412{
1413 struct snd_pcm_runtime *runtime = substream->runtime;
1414 if (runtime->state != SNDRV_PCM_STATE_PREPARED)
1415 return -EBADFD;
1416 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1417 !snd_pcm_playback_data(substream))
1418 return -EPIPE;
1419 runtime->trigger_tstamp_latched = false;
1420 runtime->trigger_master = substream;
1421 return 0;
1422}
1423
1424static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1425 snd_pcm_state_t state)
1426{
1427 int err;
1428
1429 if (substream->runtime->trigger_master != substream)
1430 return 0;
1431 err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1432 /* XRUN happened during the start */
1433 if (err == -EPIPE)
1434 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN);
1435 return err;
1436}
1437
1438static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1439 snd_pcm_state_t state)
1440{
1441 if (substream->runtime->trigger_master == substream) {
1442 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1443 substream->runtime->stop_operating = true;
1444 }
1445}
1446
1447static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1448 snd_pcm_state_t state)
1449{
1450 struct snd_pcm_runtime *runtime = substream->runtime;
1451 snd_pcm_trigger_tstamp(substream);
1452 runtime->hw_ptr_jiffies = jiffies;
1453 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1454 runtime->rate;
1455 __snd_pcm_set_state(runtime, state);
1456 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1457 runtime->silence_size > 0)
1458 snd_pcm_playback_silence(substream, ULONG_MAX);
1459 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1460}
1461
1462static const struct action_ops snd_pcm_action_start = {
1463 .pre_action = snd_pcm_pre_start,
1464 .do_action = snd_pcm_do_start,
1465 .undo_action = snd_pcm_undo_start,
1466 .post_action = snd_pcm_post_start
1467};
1468
1469/**
1470 * snd_pcm_start - start all linked streams
1471 * @substream: the PCM substream instance
1472 *
1473 * Return: Zero if successful, or a negative error code.
1474 * The stream lock must be acquired before calling this function.
1475 */
1476int snd_pcm_start(struct snd_pcm_substream *substream)
1477{
1478 return snd_pcm_action(&snd_pcm_action_start, substream,
1479 SNDRV_PCM_STATE_RUNNING);
1480}
1481
1482/* take the stream lock and start the streams */
1483static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1484{
1485 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1486 SNDRV_PCM_STATE_RUNNING);
1487}
1488
1489/*
1490 * stop callbacks
1491 */
1492static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1493 snd_pcm_state_t state)
1494{
1495 struct snd_pcm_runtime *runtime = substream->runtime;
1496 if (runtime->state == SNDRV_PCM_STATE_OPEN)
1497 return -EBADFD;
1498 runtime->trigger_master = substream;
1499 return 0;
1500}
1501
1502static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1503 snd_pcm_state_t state)
1504{
1505 if (substream->runtime->trigger_master == substream &&
1506 snd_pcm_running(substream)) {
1507 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1508 substream->runtime->stop_operating = true;
1509 }
1510 return 0; /* unconditionally stop all substreams */
1511}
1512
1513static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1514 snd_pcm_state_t state)
1515{
1516 struct snd_pcm_runtime *runtime = substream->runtime;
1517 if (runtime->state != state) {
1518 snd_pcm_trigger_tstamp(substream);
1519 __snd_pcm_set_state(runtime, state);
1520 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1521 }
1522 wake_up(&runtime->sleep);
1523 wake_up(&runtime->tsleep);
1524}
1525
1526static const struct action_ops snd_pcm_action_stop = {
1527 .pre_action = snd_pcm_pre_stop,
1528 .do_action = snd_pcm_do_stop,
1529 .post_action = snd_pcm_post_stop
1530};
1531
1532/**
1533 * snd_pcm_stop - try to stop all running streams in the substream group
1534 * @substream: the PCM substream instance
1535 * @state: PCM state after stopping the stream
1536 *
1537 * The state of each stream is then changed to the given state unconditionally.
1538 *
1539 * Return: Zero if successful, or a negative error code.
1540 */
1541int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1542{
1543 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1544}
1545EXPORT_SYMBOL(snd_pcm_stop);
1546
1547/**
1548 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1549 * @substream: the PCM substream
1550 *
1551 * After stopping, the state is changed to SETUP.
1552 * Unlike snd_pcm_stop(), this affects only the given stream.
1553 *
1554 * Return: Zero if successful, or a negative error code.
1555 */
1556int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1557{
1558 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1559 SNDRV_PCM_STATE_SETUP);
1560}
1561
1562/**
1563 * snd_pcm_stop_xrun - stop the running streams as XRUN
1564 * @substream: the PCM substream instance
1565 *
1566 * This stops the given running substream (and all linked substreams) as XRUN.
1567 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1568 *
1569 * Return: Zero if successful, or a negative error code.
1570 */
1571int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1572{
1573 unsigned long flags;
1574
1575 snd_pcm_stream_lock_irqsave(substream, flags);
1576 if (substream->runtime && snd_pcm_running(substream))
1577 __snd_pcm_xrun(substream);
1578 snd_pcm_stream_unlock_irqrestore(substream, flags);
1579 return 0;
1580}
1581EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1582
1583/*
1584 * pause callbacks: pass boolean (to start pause or resume) as state argument
1585 */
1586#define pause_pushed(state) (__force bool)(state)
1587
1588static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1589 snd_pcm_state_t state)
1590{
1591 struct snd_pcm_runtime *runtime = substream->runtime;
1592 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1593 return -ENOSYS;
1594 if (pause_pushed(state)) {
1595 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1596 return -EBADFD;
1597 } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1598 return -EBADFD;
1599 runtime->trigger_master = substream;
1600 return 0;
1601}
1602
1603static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1604 snd_pcm_state_t state)
1605{
1606 if (substream->runtime->trigger_master != substream)
1607 return 0;
1608 /* some drivers might use hw_ptr to recover from the pause -
1609 update the hw_ptr now */
1610 if (pause_pushed(state))
1611 snd_pcm_update_hw_ptr(substream);
1612 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1613 * a delta between the current jiffies, this gives a large enough
1614 * delta, effectively to skip the check once.
1615 */
1616 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1617 return substream->ops->trigger(substream,
1618 pause_pushed(state) ?
1619 SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1620 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1621}
1622
1623static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1624 snd_pcm_state_t state)
1625{
1626 if (substream->runtime->trigger_master == substream)
1627 substream->ops->trigger(substream,
1628 pause_pushed(state) ?
1629 SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1630 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1631}
1632
1633static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1634 snd_pcm_state_t state)
1635{
1636 struct snd_pcm_runtime *runtime = substream->runtime;
1637 snd_pcm_trigger_tstamp(substream);
1638 if (pause_pushed(state)) {
1639 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1640 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1641 wake_up(&runtime->sleep);
1642 wake_up(&runtime->tsleep);
1643 } else {
1644 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1645 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1646 }
1647}
1648
1649static const struct action_ops snd_pcm_action_pause = {
1650 .pre_action = snd_pcm_pre_pause,
1651 .do_action = snd_pcm_do_pause,
1652 .undo_action = snd_pcm_undo_pause,
1653 .post_action = snd_pcm_post_pause
1654};
1655
1656/*
1657 * Push/release the pause for all linked streams.
1658 */
1659static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1660{
1661 return snd_pcm_action(&snd_pcm_action_pause, substream,
1662 (__force snd_pcm_state_t)push);
1663}
1664
1665static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1666 bool push)
1667{
1668 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1669 (__force snd_pcm_state_t)push);
1670}
1671
1672#ifdef CONFIG_PM
1673/* suspend callback: state argument ignored */
1674
1675static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1676 snd_pcm_state_t state)
1677{
1678 struct snd_pcm_runtime *runtime = substream->runtime;
1679 switch (runtime->state) {
1680 case SNDRV_PCM_STATE_SUSPENDED:
1681 return -EBUSY;
1682 /* unresumable PCM state; return -EBUSY for skipping suspend */
1683 case SNDRV_PCM_STATE_OPEN:
1684 case SNDRV_PCM_STATE_SETUP:
1685 case SNDRV_PCM_STATE_DISCONNECTED:
1686 return -EBUSY;
1687 }
1688 runtime->trigger_master = substream;
1689 return 0;
1690}
1691
1692static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1693 snd_pcm_state_t state)
1694{
1695 struct snd_pcm_runtime *runtime = substream->runtime;
1696 if (runtime->trigger_master != substream)
1697 return 0;
1698 if (! snd_pcm_running(substream))
1699 return 0;
1700 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1701 runtime->stop_operating = true;
1702 return 0; /* suspend unconditionally */
1703}
1704
1705static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1706 snd_pcm_state_t state)
1707{
1708 struct snd_pcm_runtime *runtime = substream->runtime;
1709 snd_pcm_trigger_tstamp(substream);
1710 runtime->suspended_state = runtime->state;
1711 runtime->status->suspended_state = runtime->suspended_state;
1712 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1713 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1714 wake_up(&runtime->sleep);
1715 wake_up(&runtime->tsleep);
1716}
1717
1718static const struct action_ops snd_pcm_action_suspend = {
1719 .pre_action = snd_pcm_pre_suspend,
1720 .do_action = snd_pcm_do_suspend,
1721 .post_action = snd_pcm_post_suspend
1722};
1723
1724/*
1725 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1726 * @substream: the PCM substream
1727 *
1728 * After this call, all streams are changed to SUSPENDED state.
1729 *
1730 * Return: Zero if successful, or a negative error code.
1731 */
1732static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1733{
1734 int err;
1735 unsigned long flags;
1736
1737 snd_pcm_stream_lock_irqsave(substream, flags);
1738 err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1739 ACTION_ARG_IGNORE);
1740 snd_pcm_stream_unlock_irqrestore(substream, flags);
1741 return err;
1742}
1743
1744/**
1745 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1746 * @pcm: the PCM instance
1747 *
1748 * After this call, all streams are changed to SUSPENDED state.
1749 *
1750 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1751 */
1752int snd_pcm_suspend_all(struct snd_pcm *pcm)
1753{
1754 struct snd_pcm_substream *substream;
1755 int stream, err = 0;
1756
1757 if (! pcm)
1758 return 0;
1759
1760 for_each_pcm_substream(pcm, stream, substream) {
1761 /* FIXME: the open/close code should lock this as well */
1762 if (!substream->runtime)
1763 continue;
1764
1765 /*
1766 * Skip BE dai link PCM's that are internal and may
1767 * not have their substream ops set.
1768 */
1769 if (!substream->ops)
1770 continue;
1771
1772 err = snd_pcm_suspend(substream);
1773 if (err < 0 && err != -EBUSY)
1774 return err;
1775 }
1776
1777 for_each_pcm_substream(pcm, stream, substream)
1778 snd_pcm_sync_stop(substream, false);
1779
1780 return 0;
1781}
1782EXPORT_SYMBOL(snd_pcm_suspend_all);
1783
1784/* resume callbacks: state argument ignored */
1785
1786static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1787 snd_pcm_state_t state)
1788{
1789 struct snd_pcm_runtime *runtime = substream->runtime;
1790 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1791 return -ENOSYS;
1792 runtime->trigger_master = substream;
1793 return 0;
1794}
1795
1796static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1797 snd_pcm_state_t state)
1798{
1799 struct snd_pcm_runtime *runtime = substream->runtime;
1800 if (runtime->trigger_master != substream)
1801 return 0;
1802 /* DMA not running previously? */
1803 if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1804 (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1805 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1806 return 0;
1807 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1808}
1809
1810static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1811 snd_pcm_state_t state)
1812{
1813 if (substream->runtime->trigger_master == substream &&
1814 snd_pcm_running(substream))
1815 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1816}
1817
1818static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1819 snd_pcm_state_t state)
1820{
1821 struct snd_pcm_runtime *runtime = substream->runtime;
1822 snd_pcm_trigger_tstamp(substream);
1823 __snd_pcm_set_state(runtime, runtime->suspended_state);
1824 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1825}
1826
1827static const struct action_ops snd_pcm_action_resume = {
1828 .pre_action = snd_pcm_pre_resume,
1829 .do_action = snd_pcm_do_resume,
1830 .undo_action = snd_pcm_undo_resume,
1831 .post_action = snd_pcm_post_resume
1832};
1833
1834static int snd_pcm_resume(struct snd_pcm_substream *substream)
1835{
1836 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1837 ACTION_ARG_IGNORE);
1838}
1839
1840#else
1841
1842static int snd_pcm_resume(struct snd_pcm_substream *substream)
1843{
1844 return -ENOSYS;
1845}
1846
1847#endif /* CONFIG_PM */
1848
1849/*
1850 * xrun ioctl
1851 *
1852 * Change the RUNNING stream(s) to XRUN state.
1853 */
1854static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1855{
1856 struct snd_pcm_runtime *runtime = substream->runtime;
1857 int result;
1858
1859 snd_pcm_stream_lock_irq(substream);
1860 switch (runtime->state) {
1861 case SNDRV_PCM_STATE_XRUN:
1862 result = 0; /* already there */
1863 break;
1864 case SNDRV_PCM_STATE_RUNNING:
1865 __snd_pcm_xrun(substream);
1866 result = 0;
1867 break;
1868 default:
1869 result = -EBADFD;
1870 }
1871 snd_pcm_stream_unlock_irq(substream);
1872 return result;
1873}
1874
1875/*
1876 * reset ioctl
1877 */
1878/* reset callbacks: state argument ignored */
1879static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1880 snd_pcm_state_t state)
1881{
1882 struct snd_pcm_runtime *runtime = substream->runtime;
1883 switch (runtime->state) {
1884 case SNDRV_PCM_STATE_RUNNING:
1885 case SNDRV_PCM_STATE_PREPARED:
1886 case SNDRV_PCM_STATE_PAUSED:
1887 case SNDRV_PCM_STATE_SUSPENDED:
1888 return 0;
1889 default:
1890 return -EBADFD;
1891 }
1892}
1893
1894static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1895 snd_pcm_state_t state)
1896{
1897 struct snd_pcm_runtime *runtime = substream->runtime;
1898 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1899 if (err < 0)
1900 return err;
1901 snd_pcm_stream_lock_irq(substream);
1902 runtime->hw_ptr_base = 0;
1903 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1904 runtime->status->hw_ptr % runtime->period_size;
1905 runtime->silence_start = runtime->status->hw_ptr;
1906 runtime->silence_filled = 0;
1907 snd_pcm_stream_unlock_irq(substream);
1908 return 0;
1909}
1910
1911static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1912 snd_pcm_state_t state)
1913{
1914 struct snd_pcm_runtime *runtime = substream->runtime;
1915 snd_pcm_stream_lock_irq(substream);
1916 runtime->control->appl_ptr = runtime->status->hw_ptr;
1917 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1918 runtime->silence_size > 0)
1919 snd_pcm_playback_silence(substream, ULONG_MAX);
1920 snd_pcm_stream_unlock_irq(substream);
1921}
1922
1923static const struct action_ops snd_pcm_action_reset = {
1924 .pre_action = snd_pcm_pre_reset,
1925 .do_action = snd_pcm_do_reset,
1926 .post_action = snd_pcm_post_reset
1927};
1928
1929static int snd_pcm_reset(struct snd_pcm_substream *substream)
1930{
1931 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1932 ACTION_ARG_IGNORE);
1933}
1934
1935/*
1936 * prepare ioctl
1937 */
1938/* pass f_flags as state argument */
1939static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1940 snd_pcm_state_t state)
1941{
1942 struct snd_pcm_runtime *runtime = substream->runtime;
1943 int f_flags = (__force int)state;
1944
1945 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1946 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1947 return -EBADFD;
1948 if (snd_pcm_running(substream))
1949 return -EBUSY;
1950 substream->f_flags = f_flags;
1951 return 0;
1952}
1953
1954static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1955 snd_pcm_state_t state)
1956{
1957 int err;
1958 snd_pcm_sync_stop(substream, true);
1959 err = substream->ops->prepare(substream);
1960 if (err < 0)
1961 return err;
1962 return snd_pcm_do_reset(substream, state);
1963}
1964
1965static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1966 snd_pcm_state_t state)
1967{
1968 struct snd_pcm_runtime *runtime = substream->runtime;
1969 runtime->control->appl_ptr = runtime->status->hw_ptr;
1970 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1971}
1972
1973static const struct action_ops snd_pcm_action_prepare = {
1974 .pre_action = snd_pcm_pre_prepare,
1975 .do_action = snd_pcm_do_prepare,
1976 .post_action = snd_pcm_post_prepare
1977};
1978
1979/**
1980 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1981 * @substream: the PCM substream instance
1982 * @file: file to refer f_flags
1983 *
1984 * Return: Zero if successful, or a negative error code.
1985 */
1986static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1987 struct file *file)
1988{
1989 int f_flags;
1990
1991 if (file)
1992 f_flags = file->f_flags;
1993 else
1994 f_flags = substream->f_flags;
1995
1996 snd_pcm_stream_lock_irq(substream);
1997 switch (substream->runtime->state) {
1998 case SNDRV_PCM_STATE_PAUSED:
1999 snd_pcm_pause(substream, false);
2000 fallthrough;
2001 case SNDRV_PCM_STATE_SUSPENDED:
2002 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2003 break;
2004 }
2005 snd_pcm_stream_unlock_irq(substream);
2006
2007 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
2008 substream,
2009 (__force snd_pcm_state_t)f_flags);
2010}
2011
2012/*
2013 * drain ioctl
2014 */
2015
2016/* drain init callbacks: state argument ignored */
2017static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2018 snd_pcm_state_t state)
2019{
2020 struct snd_pcm_runtime *runtime = substream->runtime;
2021 switch (runtime->state) {
2022 case SNDRV_PCM_STATE_OPEN:
2023 case SNDRV_PCM_STATE_DISCONNECTED:
2024 case SNDRV_PCM_STATE_SUSPENDED:
2025 return -EBADFD;
2026 }
2027 runtime->trigger_master = substream;
2028 return 0;
2029}
2030
2031static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2032 snd_pcm_state_t state)
2033{
2034 struct snd_pcm_runtime *runtime = substream->runtime;
2035 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2036 switch (runtime->state) {
2037 case SNDRV_PCM_STATE_PREPARED:
2038 /* start playback stream if possible */
2039 if (! snd_pcm_playback_empty(substream)) {
2040 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2041 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2042 } else {
2043 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2044 }
2045 break;
2046 case SNDRV_PCM_STATE_RUNNING:
2047 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2048 break;
2049 case SNDRV_PCM_STATE_XRUN:
2050 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2051 break;
2052 default:
2053 break;
2054 }
2055 } else {
2056 /* stop running stream */
2057 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2058 snd_pcm_state_t new_state;
2059
2060 new_state = snd_pcm_capture_avail(runtime) > 0 ?
2061 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2062 snd_pcm_do_stop(substream, new_state);
2063 snd_pcm_post_stop(substream, new_state);
2064 }
2065 }
2066
2067 if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2068 runtime->trigger_master == substream &&
2069 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2070 return substream->ops->trigger(substream,
2071 SNDRV_PCM_TRIGGER_DRAIN);
2072
2073 return 0;
2074}
2075
2076static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2077 snd_pcm_state_t state)
2078{
2079}
2080
2081static const struct action_ops snd_pcm_action_drain_init = {
2082 .pre_action = snd_pcm_pre_drain_init,
2083 .do_action = snd_pcm_do_drain_init,
2084 .post_action = snd_pcm_post_drain_init
2085};
2086
2087/*
2088 * Drain the stream(s).
2089 * When the substream is linked, sync until the draining of all playback streams
2090 * is finished.
2091 * After this call, all streams are supposed to be either SETUP or DRAINING
2092 * (capture only) state.
2093 */
2094static int snd_pcm_drain(struct snd_pcm_substream *substream,
2095 struct file *file)
2096{
2097 struct snd_card *card;
2098 struct snd_pcm_runtime *runtime;
2099 struct snd_pcm_substream *s;
2100 struct snd_pcm_group *group;
2101 wait_queue_entry_t wait;
2102 int result = 0;
2103 int nonblock = 0;
2104
2105 card = substream->pcm->card;
2106 runtime = substream->runtime;
2107
2108 if (runtime->state == SNDRV_PCM_STATE_OPEN)
2109 return -EBADFD;
2110
2111 if (file) {
2112 if (file->f_flags & O_NONBLOCK)
2113 nonblock = 1;
2114 } else if (substream->f_flags & O_NONBLOCK)
2115 nonblock = 1;
2116
2117 snd_pcm_stream_lock_irq(substream);
2118 /* resume pause */
2119 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2120 snd_pcm_pause(substream, false);
2121
2122 /* pre-start/stop - all running streams are changed to DRAINING state */
2123 result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2124 ACTION_ARG_IGNORE);
2125 if (result < 0)
2126 goto unlock;
2127 /* in non-blocking, we don't wait in ioctl but let caller poll */
2128 if (nonblock) {
2129 result = -EAGAIN;
2130 goto unlock;
2131 }
2132
2133 for (;;) {
2134 long tout;
2135 struct snd_pcm_runtime *to_check;
2136 if (signal_pending(current)) {
2137 result = -ERESTARTSYS;
2138 break;
2139 }
2140 /* find a substream to drain */
2141 to_check = NULL;
2142 group = snd_pcm_stream_group_ref(substream);
2143 snd_pcm_group_for_each_entry(s, substream) {
2144 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2145 continue;
2146 runtime = s->runtime;
2147 if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2148 to_check = runtime;
2149 break;
2150 }
2151 }
2152 snd_pcm_group_unref(group, substream);
2153 if (!to_check)
2154 break; /* all drained */
2155 init_waitqueue_entry(&wait, current);
2156 set_current_state(TASK_INTERRUPTIBLE);
2157 add_wait_queue(&to_check->sleep, &wait);
2158 snd_pcm_stream_unlock_irq(substream);
2159 if (runtime->no_period_wakeup)
2160 tout = MAX_SCHEDULE_TIMEOUT;
2161 else {
2162 tout = 10;
2163 if (runtime->rate) {
2164 long t = runtime->period_size * 2 / runtime->rate;
2165 tout = max(t, tout);
2166 }
2167 tout = msecs_to_jiffies(tout * 1000);
2168 }
2169 tout = schedule_timeout(tout);
2170
2171 snd_pcm_stream_lock_irq(substream);
2172 group = snd_pcm_stream_group_ref(substream);
2173 snd_pcm_group_for_each_entry(s, substream) {
2174 if (s->runtime == to_check) {
2175 remove_wait_queue(&to_check->sleep, &wait);
2176 break;
2177 }
2178 }
2179 snd_pcm_group_unref(group, substream);
2180
2181 if (card->shutdown) {
2182 result = -ENODEV;
2183 break;
2184 }
2185 if (tout == 0) {
2186 if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2187 result = -ESTRPIPE;
2188 else {
2189 dev_dbg(substream->pcm->card->dev,
2190 "playback drain error (DMA or IRQ trouble?)\n");
2191 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2192 result = -EIO;
2193 }
2194 break;
2195 }
2196 }
2197
2198 unlock:
2199 snd_pcm_stream_unlock_irq(substream);
2200
2201 return result;
2202}
2203
2204/*
2205 * drop ioctl
2206 *
2207 * Immediately put all linked substreams into SETUP state.
2208 */
2209static int snd_pcm_drop(struct snd_pcm_substream *substream)
2210{
2211 struct snd_pcm_runtime *runtime;
2212 int result = 0;
2213
2214 if (PCM_RUNTIME_CHECK(substream))
2215 return -ENXIO;
2216 runtime = substream->runtime;
2217
2218 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2219 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2220 return -EBADFD;
2221
2222 snd_pcm_stream_lock_irq(substream);
2223 /* resume pause */
2224 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2225 snd_pcm_pause(substream, false);
2226
2227 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2228 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2229 snd_pcm_stream_unlock_irq(substream);
2230
2231 return result;
2232}
2233
2234
2235static bool is_pcm_file(struct file *file)
2236{
2237 struct inode *inode = file_inode(file);
2238 struct snd_pcm *pcm;
2239 unsigned int minor;
2240
2241 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2242 return false;
2243 minor = iminor(inode);
2244 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2245 if (!pcm)
2246 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2247 if (!pcm)
2248 return false;
2249 snd_card_unref(pcm->card);
2250 return true;
2251}
2252
2253/*
2254 * PCM link handling
2255 */
2256static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2257{
2258 int res = 0;
2259 struct snd_pcm_file *pcm_file;
2260 struct snd_pcm_substream *substream1;
2261 struct snd_pcm_group *group, *target_group;
2262 bool nonatomic = substream->pcm->nonatomic;
2263 struct fd f = fdget(fd);
2264
2265 if (!f.file)
2266 return -EBADFD;
2267 if (!is_pcm_file(f.file)) {
2268 res = -EBADFD;
2269 goto _badf;
2270 }
2271 pcm_file = f.file->private_data;
2272 substream1 = pcm_file->substream;
2273
2274 if (substream == substream1) {
2275 res = -EINVAL;
2276 goto _badf;
2277 }
2278
2279 group = kzalloc(sizeof(*group), GFP_KERNEL);
2280 if (!group) {
2281 res = -ENOMEM;
2282 goto _nolock;
2283 }
2284 snd_pcm_group_init(group);
2285
2286 down_write(&snd_pcm_link_rwsem);
2287 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2288 substream->runtime->state != substream1->runtime->state ||
2289 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2290 res = -EBADFD;
2291 goto _end;
2292 }
2293 if (snd_pcm_stream_linked(substream1)) {
2294 res = -EALREADY;
2295 goto _end;
2296 }
2297
2298 snd_pcm_stream_lock_irq(substream);
2299 if (!snd_pcm_stream_linked(substream)) {
2300 snd_pcm_group_assign(substream, group);
2301 group = NULL; /* assigned, don't free this one below */
2302 }
2303 target_group = substream->group;
2304 snd_pcm_stream_unlock_irq(substream);
2305
2306 snd_pcm_group_lock_irq(target_group, nonatomic);
2307 snd_pcm_stream_lock_nested(substream1);
2308 snd_pcm_group_assign(substream1, target_group);
2309 refcount_inc(&target_group->refs);
2310 snd_pcm_stream_unlock(substream1);
2311 snd_pcm_group_unlock_irq(target_group, nonatomic);
2312 _end:
2313 up_write(&snd_pcm_link_rwsem);
2314 _nolock:
2315 kfree(group);
2316 _badf:
2317 fdput(f);
2318 return res;
2319}
2320
2321static void relink_to_local(struct snd_pcm_substream *substream)
2322{
2323 snd_pcm_stream_lock_nested(substream);
2324 snd_pcm_group_assign(substream, &substream->self_group);
2325 snd_pcm_stream_unlock(substream);
2326}
2327
2328static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2329{
2330 struct snd_pcm_group *group;
2331 bool nonatomic = substream->pcm->nonatomic;
2332 bool do_free = false;
2333 int res = 0;
2334
2335 down_write(&snd_pcm_link_rwsem);
2336
2337 if (!snd_pcm_stream_linked(substream)) {
2338 res = -EALREADY;
2339 goto _end;
2340 }
2341
2342 group = substream->group;
2343 snd_pcm_group_lock_irq(group, nonatomic);
2344
2345 relink_to_local(substream);
2346 refcount_dec(&group->refs);
2347
2348 /* detach the last stream, too */
2349 if (list_is_singular(&group->substreams)) {
2350 relink_to_local(list_first_entry(&group->substreams,
2351 struct snd_pcm_substream,
2352 link_list));
2353 do_free = refcount_dec_and_test(&group->refs);
2354 }
2355
2356 snd_pcm_group_unlock_irq(group, nonatomic);
2357 if (do_free)
2358 kfree(group);
2359
2360 _end:
2361 up_write(&snd_pcm_link_rwsem);
2362 return res;
2363}
2364
2365/*
2366 * hw configurator
2367 */
2368static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2369 struct snd_pcm_hw_rule *rule)
2370{
2371 struct snd_interval t;
2372 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2373 hw_param_interval_c(params, rule->deps[1]), &t);
2374 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2375}
2376
2377static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2378 struct snd_pcm_hw_rule *rule)
2379{
2380 struct snd_interval t;
2381 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2382 hw_param_interval_c(params, rule->deps[1]), &t);
2383 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2384}
2385
2386static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2387 struct snd_pcm_hw_rule *rule)
2388{
2389 struct snd_interval t;
2390 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2391 hw_param_interval_c(params, rule->deps[1]),
2392 (unsigned long) rule->private, &t);
2393 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2394}
2395
2396static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2397 struct snd_pcm_hw_rule *rule)
2398{
2399 struct snd_interval t;
2400 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2401 (unsigned long) rule->private,
2402 hw_param_interval_c(params, rule->deps[1]), &t);
2403 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2404}
2405
2406static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2407 struct snd_pcm_hw_rule *rule)
2408{
2409 snd_pcm_format_t k;
2410 const struct snd_interval *i =
2411 hw_param_interval_c(params, rule->deps[0]);
2412 struct snd_mask m;
2413 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2414 snd_mask_any(&m);
2415 pcm_for_each_format(k) {
2416 int bits;
2417 if (!snd_mask_test_format(mask, k))
2418 continue;
2419 bits = snd_pcm_format_physical_width(k);
2420 if (bits <= 0)
2421 continue; /* ignore invalid formats */
2422 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2423 snd_mask_reset(&m, (__force unsigned)k);
2424 }
2425 return snd_mask_refine(mask, &m);
2426}
2427
2428static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2429 struct snd_pcm_hw_rule *rule)
2430{
2431 struct snd_interval t;
2432 snd_pcm_format_t k;
2433
2434 t.min = UINT_MAX;
2435 t.max = 0;
2436 t.openmin = 0;
2437 t.openmax = 0;
2438 pcm_for_each_format(k) {
2439 int bits;
2440 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2441 continue;
2442 bits = snd_pcm_format_physical_width(k);
2443 if (bits <= 0)
2444 continue; /* ignore invalid formats */
2445 if (t.min > (unsigned)bits)
2446 t.min = bits;
2447 if (t.max < (unsigned)bits)
2448 t.max = bits;
2449 }
2450 t.integer = 1;
2451 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2452}
2453
2454#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2455#error "Change this table"
2456#endif
2457
2458static const unsigned int rates[] = {
2459 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2460 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2461};
2462
2463const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2464 .count = ARRAY_SIZE(rates),
2465 .list = rates,
2466};
2467
2468static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2469 struct snd_pcm_hw_rule *rule)
2470{
2471 struct snd_pcm_hardware *hw = rule->private;
2472 return snd_interval_list(hw_param_interval(params, rule->var),
2473 snd_pcm_known_rates.count,
2474 snd_pcm_known_rates.list, hw->rates);
2475}
2476
2477static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2478 struct snd_pcm_hw_rule *rule)
2479{
2480 struct snd_interval t;
2481 struct snd_pcm_substream *substream = rule->private;
2482 t.min = 0;
2483 t.max = substream->buffer_bytes_max;
2484 t.openmin = 0;
2485 t.openmax = 0;
2486 t.integer = 1;
2487 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2488}
2489
2490static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2491{
2492 struct snd_pcm_runtime *runtime = substream->runtime;
2493 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2494 int k, err;
2495
2496 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2497 snd_mask_any(constrs_mask(constrs, k));
2498 }
2499
2500 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2501 snd_interval_any(constrs_interval(constrs, k));
2502 }
2503
2504 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2505 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2506 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2507 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2508 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2509
2510 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2511 snd_pcm_hw_rule_format, NULL,
2512 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2513 if (err < 0)
2514 return err;
2515 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2516 snd_pcm_hw_rule_sample_bits, NULL,
2517 SNDRV_PCM_HW_PARAM_FORMAT,
2518 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2519 if (err < 0)
2520 return err;
2521 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2522 snd_pcm_hw_rule_div, NULL,
2523 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2524 if (err < 0)
2525 return err;
2526 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2527 snd_pcm_hw_rule_mul, NULL,
2528 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2529 if (err < 0)
2530 return err;
2531 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2532 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2533 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2534 if (err < 0)
2535 return err;
2536 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2537 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2538 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2539 if (err < 0)
2540 return err;
2541 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2542 snd_pcm_hw_rule_div, NULL,
2543 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2544 if (err < 0)
2545 return err;
2546 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2547 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2548 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2549 if (err < 0)
2550 return err;
2551 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2552 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2553 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2554 if (err < 0)
2555 return err;
2556 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2557 snd_pcm_hw_rule_div, NULL,
2558 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2559 if (err < 0)
2560 return err;
2561 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2562 snd_pcm_hw_rule_div, NULL,
2563 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2564 if (err < 0)
2565 return err;
2566 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2567 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2568 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2569 if (err < 0)
2570 return err;
2571 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2572 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2573 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2574 if (err < 0)
2575 return err;
2576 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2577 snd_pcm_hw_rule_mul, NULL,
2578 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2579 if (err < 0)
2580 return err;
2581 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2582 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2583 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2584 if (err < 0)
2585 return err;
2586 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2587 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2588 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2589 if (err < 0)
2590 return err;
2591 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2592 snd_pcm_hw_rule_muldivk, (void*) 8,
2593 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2594 if (err < 0)
2595 return err;
2596 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2597 snd_pcm_hw_rule_muldivk, (void*) 8,
2598 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2599 if (err < 0)
2600 return err;
2601 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2602 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2603 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2604 if (err < 0)
2605 return err;
2606 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2607 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2608 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2609 if (err < 0)
2610 return err;
2611 return 0;
2612}
2613
2614static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2615{
2616 struct snd_pcm_runtime *runtime = substream->runtime;
2617 struct snd_pcm_hardware *hw = &runtime->hw;
2618 int err;
2619 unsigned int mask = 0;
2620
2621 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2622 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2623 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2624 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2625 if (hw_support_mmap(substream)) {
2626 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2627 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2628 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2629 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2630 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2631 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2632 }
2633 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2634 if (err < 0)
2635 return err;
2636
2637 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2638 if (err < 0)
2639 return err;
2640
2641 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2642 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2643 if (err < 0)
2644 return err;
2645
2646 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2647 hw->channels_min, hw->channels_max);
2648 if (err < 0)
2649 return err;
2650
2651 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2652 hw->rate_min, hw->rate_max);
2653 if (err < 0)
2654 return err;
2655
2656 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2657 hw->period_bytes_min, hw->period_bytes_max);
2658 if (err < 0)
2659 return err;
2660
2661 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2662 hw->periods_min, hw->periods_max);
2663 if (err < 0)
2664 return err;
2665
2666 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2667 hw->period_bytes_min, hw->buffer_bytes_max);
2668 if (err < 0)
2669 return err;
2670
2671 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2672 snd_pcm_hw_rule_buffer_bytes_max, substream,
2673 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2674 if (err < 0)
2675 return err;
2676
2677 /* FIXME: remove */
2678 if (runtime->dma_bytes) {
2679 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2680 if (err < 0)
2681 return err;
2682 }
2683
2684 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2685 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2686 snd_pcm_hw_rule_rate, hw,
2687 SNDRV_PCM_HW_PARAM_RATE, -1);
2688 if (err < 0)
2689 return err;
2690 }
2691
2692 /* FIXME: this belong to lowlevel */
2693 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2694
2695 return 0;
2696}
2697
2698static void pcm_release_private(struct snd_pcm_substream *substream)
2699{
2700 if (snd_pcm_stream_linked(substream))
2701 snd_pcm_unlink(substream);
2702}
2703
2704void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2705{
2706 substream->ref_count--;
2707 if (substream->ref_count > 0)
2708 return;
2709
2710 snd_pcm_drop(substream);
2711 if (substream->hw_opened) {
2712 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2713 do_hw_free(substream);
2714 substream->ops->close(substream);
2715 substream->hw_opened = 0;
2716 }
2717 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2718 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2719 if (substream->pcm_release) {
2720 substream->pcm_release(substream);
2721 substream->pcm_release = NULL;
2722 }
2723 snd_pcm_detach_substream(substream);
2724}
2725EXPORT_SYMBOL(snd_pcm_release_substream);
2726
2727int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2728 struct file *file,
2729 struct snd_pcm_substream **rsubstream)
2730{
2731 struct snd_pcm_substream *substream;
2732 int err;
2733
2734 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2735 if (err < 0)
2736 return err;
2737 if (substream->ref_count > 1) {
2738 *rsubstream = substream;
2739 return 0;
2740 }
2741
2742 err = snd_pcm_hw_constraints_init(substream);
2743 if (err < 0) {
2744 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2745 goto error;
2746 }
2747
2748 err = substream->ops->open(substream);
2749 if (err < 0)
2750 goto error;
2751
2752 substream->hw_opened = 1;
2753
2754 err = snd_pcm_hw_constraints_complete(substream);
2755 if (err < 0) {
2756 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2757 goto error;
2758 }
2759
2760 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2761 * the DMA buffer requires it
2762 */
2763 if (substream->managed_buffer_alloc &&
2764 substream->dma_buffer.dev.need_sync)
2765 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2766
2767 *rsubstream = substream;
2768 return 0;
2769
2770 error:
2771 snd_pcm_release_substream(substream);
2772 return err;
2773}
2774EXPORT_SYMBOL(snd_pcm_open_substream);
2775
2776static int snd_pcm_open_file(struct file *file,
2777 struct snd_pcm *pcm,
2778 int stream)
2779{
2780 struct snd_pcm_file *pcm_file;
2781 struct snd_pcm_substream *substream;
2782 int err;
2783
2784 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2785 if (err < 0)
2786 return err;
2787
2788 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2789 if (pcm_file == NULL) {
2790 snd_pcm_release_substream(substream);
2791 return -ENOMEM;
2792 }
2793 pcm_file->substream = substream;
2794 if (substream->ref_count == 1)
2795 substream->pcm_release = pcm_release_private;
2796 file->private_data = pcm_file;
2797
2798 return 0;
2799}
2800
2801static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2802{
2803 struct snd_pcm *pcm;
2804 int err = nonseekable_open(inode, file);
2805 if (err < 0)
2806 return err;
2807 pcm = snd_lookup_minor_data(iminor(inode),
2808 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2809 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2810 if (pcm)
2811 snd_card_unref(pcm->card);
2812 return err;
2813}
2814
2815static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2816{
2817 struct snd_pcm *pcm;
2818 int err = nonseekable_open(inode, file);
2819 if (err < 0)
2820 return err;
2821 pcm = snd_lookup_minor_data(iminor(inode),
2822 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2823 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2824 if (pcm)
2825 snd_card_unref(pcm->card);
2826 return err;
2827}
2828
2829static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2830{
2831 int err;
2832 wait_queue_entry_t wait;
2833
2834 if (pcm == NULL) {
2835 err = -ENODEV;
2836 goto __error1;
2837 }
2838 err = snd_card_file_add(pcm->card, file);
2839 if (err < 0)
2840 goto __error1;
2841 if (!try_module_get(pcm->card->module)) {
2842 err = -EFAULT;
2843 goto __error2;
2844 }
2845 init_waitqueue_entry(&wait, current);
2846 add_wait_queue(&pcm->open_wait, &wait);
2847 mutex_lock(&pcm->open_mutex);
2848 while (1) {
2849 err = snd_pcm_open_file(file, pcm, stream);
2850 if (err >= 0)
2851 break;
2852 if (err == -EAGAIN) {
2853 if (file->f_flags & O_NONBLOCK) {
2854 err = -EBUSY;
2855 break;
2856 }
2857 } else
2858 break;
2859 set_current_state(TASK_INTERRUPTIBLE);
2860 mutex_unlock(&pcm->open_mutex);
2861 schedule();
2862 mutex_lock(&pcm->open_mutex);
2863 if (pcm->card->shutdown) {
2864 err = -ENODEV;
2865 break;
2866 }
2867 if (signal_pending(current)) {
2868 err = -ERESTARTSYS;
2869 break;
2870 }
2871 }
2872 remove_wait_queue(&pcm->open_wait, &wait);
2873 mutex_unlock(&pcm->open_mutex);
2874 if (err < 0)
2875 goto __error;
2876 return err;
2877
2878 __error:
2879 module_put(pcm->card->module);
2880 __error2:
2881 snd_card_file_remove(pcm->card, file);
2882 __error1:
2883 return err;
2884}
2885
2886static int snd_pcm_release(struct inode *inode, struct file *file)
2887{
2888 struct snd_pcm *pcm;
2889 struct snd_pcm_substream *substream;
2890 struct snd_pcm_file *pcm_file;
2891
2892 pcm_file = file->private_data;
2893 substream = pcm_file->substream;
2894 if (snd_BUG_ON(!substream))
2895 return -ENXIO;
2896 pcm = substream->pcm;
2897
2898 /* block until the device gets woken up as it may touch the hardware */
2899 snd_power_wait(pcm->card);
2900
2901 mutex_lock(&pcm->open_mutex);
2902 snd_pcm_release_substream(substream);
2903 kfree(pcm_file);
2904 mutex_unlock(&pcm->open_mutex);
2905 wake_up(&pcm->open_wait);
2906 module_put(pcm->card->module);
2907 snd_card_file_remove(pcm->card, file);
2908 return 0;
2909}
2910
2911/* check and update PCM state; return 0 or a negative error
2912 * call this inside PCM lock
2913 */
2914static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2915{
2916 switch (substream->runtime->state) {
2917 case SNDRV_PCM_STATE_DRAINING:
2918 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2919 return -EBADFD;
2920 fallthrough;
2921 case SNDRV_PCM_STATE_RUNNING:
2922 return snd_pcm_update_hw_ptr(substream);
2923 case SNDRV_PCM_STATE_PREPARED:
2924 case SNDRV_PCM_STATE_PAUSED:
2925 return 0;
2926 case SNDRV_PCM_STATE_SUSPENDED:
2927 return -ESTRPIPE;
2928 case SNDRV_PCM_STATE_XRUN:
2929 return -EPIPE;
2930 default:
2931 return -EBADFD;
2932 }
2933}
2934
2935/* increase the appl_ptr; returns the processed frames or a negative error */
2936static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2937 snd_pcm_uframes_t frames,
2938 snd_pcm_sframes_t avail)
2939{
2940 struct snd_pcm_runtime *runtime = substream->runtime;
2941 snd_pcm_sframes_t appl_ptr;
2942 int ret;
2943
2944 if (avail <= 0)
2945 return 0;
2946 if (frames > (snd_pcm_uframes_t)avail)
2947 frames = avail;
2948 appl_ptr = runtime->control->appl_ptr + frames;
2949 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2950 appl_ptr -= runtime->boundary;
2951 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2952 return ret < 0 ? ret : frames;
2953}
2954
2955/* decrease the appl_ptr; returns the processed frames or zero for error */
2956static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2957 snd_pcm_uframes_t frames,
2958 snd_pcm_sframes_t avail)
2959{
2960 struct snd_pcm_runtime *runtime = substream->runtime;
2961 snd_pcm_sframes_t appl_ptr;
2962 int ret;
2963
2964 if (avail <= 0)
2965 return 0;
2966 if (frames > (snd_pcm_uframes_t)avail)
2967 frames = avail;
2968 appl_ptr = runtime->control->appl_ptr - frames;
2969 if (appl_ptr < 0)
2970 appl_ptr += runtime->boundary;
2971 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2972 /* NOTE: we return zero for errors because PulseAudio gets depressed
2973 * upon receiving an error from rewind ioctl and stops processing
2974 * any longer. Returning zero means that no rewind is done, so
2975 * it's not absolutely wrong to answer like that.
2976 */
2977 return ret < 0 ? 0 : frames;
2978}
2979
2980static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2981 snd_pcm_uframes_t frames)
2982{
2983 snd_pcm_sframes_t ret;
2984
2985 if (frames == 0)
2986 return 0;
2987
2988 snd_pcm_stream_lock_irq(substream);
2989 ret = do_pcm_hwsync(substream);
2990 if (!ret)
2991 ret = rewind_appl_ptr(substream, frames,
2992 snd_pcm_hw_avail(substream));
2993 snd_pcm_stream_unlock_irq(substream);
2994 if (ret >= 0)
2995 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2996 return ret;
2997}
2998
2999static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
3000 snd_pcm_uframes_t frames)
3001{
3002 snd_pcm_sframes_t ret;
3003
3004 if (frames == 0)
3005 return 0;
3006
3007 snd_pcm_stream_lock_irq(substream);
3008 ret = do_pcm_hwsync(substream);
3009 if (!ret)
3010 ret = forward_appl_ptr(substream, frames,
3011 snd_pcm_avail(substream));
3012 snd_pcm_stream_unlock_irq(substream);
3013 if (ret >= 0)
3014 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3015 return ret;
3016}
3017
3018static int snd_pcm_delay(struct snd_pcm_substream *substream,
3019 snd_pcm_sframes_t *delay)
3020{
3021 int err;
3022
3023 snd_pcm_stream_lock_irq(substream);
3024 err = do_pcm_hwsync(substream);
3025 if (delay && !err)
3026 *delay = snd_pcm_calc_delay(substream);
3027 snd_pcm_stream_unlock_irq(substream);
3028 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3029
3030 return err;
3031}
3032
3033static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3034{
3035 return snd_pcm_delay(substream, NULL);
3036}
3037
3038static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3039 struct snd_pcm_sync_ptr __user *_sync_ptr)
3040{
3041 struct snd_pcm_runtime *runtime = substream->runtime;
3042 struct snd_pcm_sync_ptr sync_ptr;
3043 volatile struct snd_pcm_mmap_status *status;
3044 volatile struct snd_pcm_mmap_control *control;
3045 int err;
3046
3047 memset(&sync_ptr, 0, sizeof(sync_ptr));
3048 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3049 return -EFAULT;
3050 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3051 return -EFAULT;
3052 status = runtime->status;
3053 control = runtime->control;
3054 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3055 err = snd_pcm_hwsync(substream);
3056 if (err < 0)
3057 return err;
3058 }
3059 snd_pcm_stream_lock_irq(substream);
3060 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3061 err = pcm_lib_apply_appl_ptr(substream,
3062 sync_ptr.c.control.appl_ptr);
3063 if (err < 0) {
3064 snd_pcm_stream_unlock_irq(substream);
3065 return err;
3066 }
3067 } else {
3068 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3069 }
3070 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3071 control->avail_min = sync_ptr.c.control.avail_min;
3072 else
3073 sync_ptr.c.control.avail_min = control->avail_min;
3074 sync_ptr.s.status.state = status->state;
3075 sync_ptr.s.status.hw_ptr = status->hw_ptr;
3076 sync_ptr.s.status.tstamp = status->tstamp;
3077 sync_ptr.s.status.suspended_state = status->suspended_state;
3078 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3079 snd_pcm_stream_unlock_irq(substream);
3080 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3081 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3082 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3083 return -EFAULT;
3084 return 0;
3085}
3086
3087struct snd_pcm_mmap_status32 {
3088 snd_pcm_state_t state;
3089 s32 pad1;
3090 u32 hw_ptr;
3091 s32 tstamp_sec;
3092 s32 tstamp_nsec;
3093 snd_pcm_state_t suspended_state;
3094 s32 audio_tstamp_sec;
3095 s32 audio_tstamp_nsec;
3096} __attribute__((packed));
3097
3098struct snd_pcm_mmap_control32 {
3099 u32 appl_ptr;
3100 u32 avail_min;
3101};
3102
3103struct snd_pcm_sync_ptr32 {
3104 u32 flags;
3105 union {
3106 struct snd_pcm_mmap_status32 status;
3107 unsigned char reserved[64];
3108 } s;
3109 union {
3110 struct snd_pcm_mmap_control32 control;
3111 unsigned char reserved[64];
3112 } c;
3113} __attribute__((packed));
3114
3115/* recalcuate the boundary within 32bit */
3116static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3117{
3118 snd_pcm_uframes_t boundary;
3119
3120 if (! runtime->buffer_size)
3121 return 0;
3122 boundary = runtime->buffer_size;
3123 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3124 boundary *= 2;
3125 return boundary;
3126}
3127
3128static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3129 struct snd_pcm_sync_ptr32 __user *src)
3130{
3131 struct snd_pcm_runtime *runtime = substream->runtime;
3132 volatile struct snd_pcm_mmap_status *status;
3133 volatile struct snd_pcm_mmap_control *control;
3134 u32 sflags;
3135 struct snd_pcm_mmap_control scontrol;
3136 struct snd_pcm_mmap_status sstatus;
3137 snd_pcm_uframes_t boundary;
3138 int err;
3139
3140 if (snd_BUG_ON(!runtime))
3141 return -EINVAL;
3142
3143 if (get_user(sflags, &src->flags) ||
3144 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3145 get_user(scontrol.avail_min, &src->c.control.avail_min))
3146 return -EFAULT;
3147 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3148 err = snd_pcm_hwsync(substream);
3149 if (err < 0)
3150 return err;
3151 }
3152 status = runtime->status;
3153 control = runtime->control;
3154 boundary = recalculate_boundary(runtime);
3155 if (! boundary)
3156 boundary = 0x7fffffff;
3157 snd_pcm_stream_lock_irq(substream);
3158 /* FIXME: we should consider the boundary for the sync from app */
3159 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3160 err = pcm_lib_apply_appl_ptr(substream,
3161 scontrol.appl_ptr);
3162 if (err < 0) {
3163 snd_pcm_stream_unlock_irq(substream);
3164 return err;
3165 }
3166 } else
3167 scontrol.appl_ptr = control->appl_ptr % boundary;
3168 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3169 control->avail_min = scontrol.avail_min;
3170 else
3171 scontrol.avail_min = control->avail_min;
3172 sstatus.state = status->state;
3173 sstatus.hw_ptr = status->hw_ptr % boundary;
3174 sstatus.tstamp = status->tstamp;
3175 sstatus.suspended_state = status->suspended_state;
3176 sstatus.audio_tstamp = status->audio_tstamp;
3177 snd_pcm_stream_unlock_irq(substream);
3178 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3179 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3180 if (put_user(sstatus.state, &src->s.status.state) ||
3181 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3182 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3183 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3184 put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3185 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3186 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3187 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3188 put_user(scontrol.avail_min, &src->c.control.avail_min))
3189 return -EFAULT;
3190
3191 return 0;
3192}
3193#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3194
3195static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3196{
3197 struct snd_pcm_runtime *runtime = substream->runtime;
3198 int arg;
3199
3200 if (get_user(arg, _arg))
3201 return -EFAULT;
3202 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3203 return -EINVAL;
3204 runtime->tstamp_type = arg;
3205 return 0;
3206}
3207
3208static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3209 struct snd_xferi __user *_xferi)
3210{
3211 struct snd_xferi xferi;
3212 struct snd_pcm_runtime *runtime = substream->runtime;
3213 snd_pcm_sframes_t result;
3214
3215 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3216 return -EBADFD;
3217 if (put_user(0, &_xferi->result))
3218 return -EFAULT;
3219 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3220 return -EFAULT;
3221 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3222 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3223 else
3224 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3225 if (put_user(result, &_xferi->result))
3226 return -EFAULT;
3227 return result < 0 ? result : 0;
3228}
3229
3230static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3231 struct snd_xfern __user *_xfern)
3232{
3233 struct snd_xfern xfern;
3234 struct snd_pcm_runtime *runtime = substream->runtime;
3235 void *bufs;
3236 snd_pcm_sframes_t result;
3237
3238 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3239 return -EBADFD;
3240 if (runtime->channels > 128)
3241 return -EINVAL;
3242 if (put_user(0, &_xfern->result))
3243 return -EFAULT;
3244 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3245 return -EFAULT;
3246
3247 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3248 if (IS_ERR(bufs))
3249 return PTR_ERR(bufs);
3250 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3251 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3252 else
3253 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3254 kfree(bufs);
3255 if (put_user(result, &_xfern->result))
3256 return -EFAULT;
3257 return result < 0 ? result : 0;
3258}
3259
3260static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3261 snd_pcm_uframes_t __user *_frames)
3262{
3263 snd_pcm_uframes_t frames;
3264 snd_pcm_sframes_t result;
3265
3266 if (get_user(frames, _frames))
3267 return -EFAULT;
3268 if (put_user(0, _frames))
3269 return -EFAULT;
3270 result = snd_pcm_rewind(substream, frames);
3271 if (put_user(result, _frames))
3272 return -EFAULT;
3273 return result < 0 ? result : 0;
3274}
3275
3276static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3277 snd_pcm_uframes_t __user *_frames)
3278{
3279 snd_pcm_uframes_t frames;
3280 snd_pcm_sframes_t result;
3281
3282 if (get_user(frames, _frames))
3283 return -EFAULT;
3284 if (put_user(0, _frames))
3285 return -EFAULT;
3286 result = snd_pcm_forward(substream, frames);
3287 if (put_user(result, _frames))
3288 return -EFAULT;
3289 return result < 0 ? result : 0;
3290}
3291
3292static int snd_pcm_common_ioctl(struct file *file,
3293 struct snd_pcm_substream *substream,
3294 unsigned int cmd, void __user *arg)
3295{
3296 struct snd_pcm_file *pcm_file = file->private_data;
3297 int res;
3298
3299 if (PCM_RUNTIME_CHECK(substream))
3300 return -ENXIO;
3301
3302 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3303 return -EBADFD;
3304
3305 res = snd_power_wait(substream->pcm->card);
3306 if (res < 0)
3307 return res;
3308
3309 switch (cmd) {
3310 case SNDRV_PCM_IOCTL_PVERSION:
3311 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3312 case SNDRV_PCM_IOCTL_INFO:
3313 return snd_pcm_info_user(substream, arg);
3314 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
3315 return 0;
3316 case SNDRV_PCM_IOCTL_TTSTAMP:
3317 return snd_pcm_tstamp(substream, arg);
3318 case SNDRV_PCM_IOCTL_USER_PVERSION:
3319 if (get_user(pcm_file->user_pversion,
3320 (unsigned int __user *)arg))
3321 return -EFAULT;
3322 return 0;
3323 case SNDRV_PCM_IOCTL_HW_REFINE:
3324 return snd_pcm_hw_refine_user(substream, arg);
3325 case SNDRV_PCM_IOCTL_HW_PARAMS:
3326 return snd_pcm_hw_params_user(substream, arg);
3327 case SNDRV_PCM_IOCTL_HW_FREE:
3328 return snd_pcm_hw_free(substream);
3329 case SNDRV_PCM_IOCTL_SW_PARAMS:
3330 return snd_pcm_sw_params_user(substream, arg);
3331 case SNDRV_PCM_IOCTL_STATUS32:
3332 return snd_pcm_status_user32(substream, arg, false);
3333 case SNDRV_PCM_IOCTL_STATUS_EXT32:
3334 return snd_pcm_status_user32(substream, arg, true);
3335 case SNDRV_PCM_IOCTL_STATUS64:
3336 return snd_pcm_status_user64(substream, arg, false);
3337 case SNDRV_PCM_IOCTL_STATUS_EXT64:
3338 return snd_pcm_status_user64(substream, arg, true);
3339 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3340 return snd_pcm_channel_info_user(substream, arg);
3341 case SNDRV_PCM_IOCTL_PREPARE:
3342 return snd_pcm_prepare(substream, file);
3343 case SNDRV_PCM_IOCTL_RESET:
3344 return snd_pcm_reset(substream);
3345 case SNDRV_PCM_IOCTL_START:
3346 return snd_pcm_start_lock_irq(substream);
3347 case SNDRV_PCM_IOCTL_LINK:
3348 return snd_pcm_link(substream, (int)(unsigned long) arg);
3349 case SNDRV_PCM_IOCTL_UNLINK:
3350 return snd_pcm_unlink(substream);
3351 case SNDRV_PCM_IOCTL_RESUME:
3352 return snd_pcm_resume(substream);
3353 case SNDRV_PCM_IOCTL_XRUN:
3354 return snd_pcm_xrun(substream);
3355 case SNDRV_PCM_IOCTL_HWSYNC:
3356 return snd_pcm_hwsync(substream);
3357 case SNDRV_PCM_IOCTL_DELAY:
3358 {
3359 snd_pcm_sframes_t delay = 0;
3360 snd_pcm_sframes_t __user *res = arg;
3361 int err;
3362
3363 err = snd_pcm_delay(substream, &delay);
3364 if (err)
3365 return err;
3366 if (put_user(delay, res))
3367 return -EFAULT;
3368 return 0;
3369 }
3370 case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3371 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3372 case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3373 return snd_pcm_sync_ptr(substream, arg);
3374#ifdef CONFIG_SND_SUPPORT_OLD_API
3375 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3376 return snd_pcm_hw_refine_old_user(substream, arg);
3377 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3378 return snd_pcm_hw_params_old_user(substream, arg);
3379#endif
3380 case SNDRV_PCM_IOCTL_DRAIN:
3381 return snd_pcm_drain(substream, file);
3382 case SNDRV_PCM_IOCTL_DROP:
3383 return snd_pcm_drop(substream);
3384 case SNDRV_PCM_IOCTL_PAUSE:
3385 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3386 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3387 case SNDRV_PCM_IOCTL_READI_FRAMES:
3388 return snd_pcm_xferi_frames_ioctl(substream, arg);
3389 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3390 case SNDRV_PCM_IOCTL_READN_FRAMES:
3391 return snd_pcm_xfern_frames_ioctl(substream, arg);
3392 case SNDRV_PCM_IOCTL_REWIND:
3393 return snd_pcm_rewind_ioctl(substream, arg);
3394 case SNDRV_PCM_IOCTL_FORWARD:
3395 return snd_pcm_forward_ioctl(substream, arg);
3396 }
3397 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3398 return -ENOTTY;
3399}
3400
3401static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3402 unsigned long arg)
3403{
3404 struct snd_pcm_file *pcm_file;
3405
3406 pcm_file = file->private_data;
3407
3408 if (((cmd >> 8) & 0xff) != 'A')
3409 return -ENOTTY;
3410
3411 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3412 (void __user *)arg);
3413}
3414
3415/**
3416 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3417 * @substream: PCM substream
3418 * @cmd: IOCTL cmd
3419 * @arg: IOCTL argument
3420 *
3421 * The function is provided primarily for OSS layer and USB gadget drivers,
3422 * and it allows only the limited set of ioctls (hw_params, sw_params,
3423 * prepare, start, drain, drop, forward).
3424 *
3425 * Return: zero if successful, or a negative error code
3426 */
3427int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3428 unsigned int cmd, void *arg)
3429{
3430 snd_pcm_uframes_t *frames = arg;
3431 snd_pcm_sframes_t result;
3432
3433 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3434 return -EBADFD;
3435
3436 switch (cmd) {
3437 case SNDRV_PCM_IOCTL_FORWARD:
3438 {
3439 /* provided only for OSS; capture-only and no value returned */
3440 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3441 return -EINVAL;
3442 result = snd_pcm_forward(substream, *frames);
3443 return result < 0 ? result : 0;
3444 }
3445 case SNDRV_PCM_IOCTL_HW_PARAMS:
3446 return snd_pcm_hw_params(substream, arg);
3447 case SNDRV_PCM_IOCTL_SW_PARAMS:
3448 return snd_pcm_sw_params(substream, arg);
3449 case SNDRV_PCM_IOCTL_PREPARE:
3450 return snd_pcm_prepare(substream, NULL);
3451 case SNDRV_PCM_IOCTL_START:
3452 return snd_pcm_start_lock_irq(substream);
3453 case SNDRV_PCM_IOCTL_DRAIN:
3454 return snd_pcm_drain(substream, NULL);
3455 case SNDRV_PCM_IOCTL_DROP:
3456 return snd_pcm_drop(substream);
3457 case SNDRV_PCM_IOCTL_DELAY:
3458 return snd_pcm_delay(substream, frames);
3459 default:
3460 return -EINVAL;
3461 }
3462}
3463EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3464
3465static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3466 loff_t * offset)
3467{
3468 struct snd_pcm_file *pcm_file;
3469 struct snd_pcm_substream *substream;
3470 struct snd_pcm_runtime *runtime;
3471 snd_pcm_sframes_t result;
3472
3473 pcm_file = file->private_data;
3474 substream = pcm_file->substream;
3475 if (PCM_RUNTIME_CHECK(substream))
3476 return -ENXIO;
3477 runtime = substream->runtime;
3478 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3479 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3480 return -EBADFD;
3481 if (!frame_aligned(runtime, count))
3482 return -EINVAL;
3483 count = bytes_to_frames(runtime, count);
3484 result = snd_pcm_lib_read(substream, buf, count);
3485 if (result > 0)
3486 result = frames_to_bytes(runtime, result);
3487 return result;
3488}
3489
3490static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3491 size_t count, loff_t * offset)
3492{
3493 struct snd_pcm_file *pcm_file;
3494 struct snd_pcm_substream *substream;
3495 struct snd_pcm_runtime *runtime;
3496 snd_pcm_sframes_t result;
3497
3498 pcm_file = file->private_data;
3499 substream = pcm_file->substream;
3500 if (PCM_RUNTIME_CHECK(substream))
3501 return -ENXIO;
3502 runtime = substream->runtime;
3503 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3504 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3505 return -EBADFD;
3506 if (!frame_aligned(runtime, count))
3507 return -EINVAL;
3508 count = bytes_to_frames(runtime, count);
3509 result = snd_pcm_lib_write(substream, buf, count);
3510 if (result > 0)
3511 result = frames_to_bytes(runtime, result);
3512 return result;
3513}
3514
3515static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3516{
3517 struct snd_pcm_file *pcm_file;
3518 struct snd_pcm_substream *substream;
3519 struct snd_pcm_runtime *runtime;
3520 snd_pcm_sframes_t result;
3521 unsigned long i;
3522 void __user **bufs;
3523 snd_pcm_uframes_t frames;
3524
3525 pcm_file = iocb->ki_filp->private_data;
3526 substream = pcm_file->substream;
3527 if (PCM_RUNTIME_CHECK(substream))
3528 return -ENXIO;
3529 runtime = substream->runtime;
3530 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3531 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3532 return -EBADFD;
3533 if (!iter_is_iovec(to))
3534 return -EINVAL;
3535 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3536 return -EINVAL;
3537 if (!frame_aligned(runtime, to->iov->iov_len))
3538 return -EINVAL;
3539 frames = bytes_to_samples(runtime, to->iov->iov_len);
3540 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3541 if (bufs == NULL)
3542 return -ENOMEM;
3543 for (i = 0; i < to->nr_segs; ++i)
3544 bufs[i] = to->iov[i].iov_base;
3545 result = snd_pcm_lib_readv(substream, bufs, frames);
3546 if (result > 0)
3547 result = frames_to_bytes(runtime, result);
3548 kfree(bufs);
3549 return result;
3550}
3551
3552static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3553{
3554 struct snd_pcm_file *pcm_file;
3555 struct snd_pcm_substream *substream;
3556 struct snd_pcm_runtime *runtime;
3557 snd_pcm_sframes_t result;
3558 unsigned long i;
3559 void __user **bufs;
3560 snd_pcm_uframes_t frames;
3561
3562 pcm_file = iocb->ki_filp->private_data;
3563 substream = pcm_file->substream;
3564 if (PCM_RUNTIME_CHECK(substream))
3565 return -ENXIO;
3566 runtime = substream->runtime;
3567 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3568 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3569 return -EBADFD;
3570 if (!iter_is_iovec(from))
3571 return -EINVAL;
3572 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3573 !frame_aligned(runtime, from->iov->iov_len))
3574 return -EINVAL;
3575 frames = bytes_to_samples(runtime, from->iov->iov_len);
3576 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3577 if (bufs == NULL)
3578 return -ENOMEM;
3579 for (i = 0; i < from->nr_segs; ++i)
3580 bufs[i] = from->iov[i].iov_base;
3581 result = snd_pcm_lib_writev(substream, bufs, frames);
3582 if (result > 0)
3583 result = frames_to_bytes(runtime, result);
3584 kfree(bufs);
3585 return result;
3586}
3587
3588static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3589{
3590 struct snd_pcm_file *pcm_file;
3591 struct snd_pcm_substream *substream;
3592 struct snd_pcm_runtime *runtime;
3593 __poll_t mask, ok;
3594 snd_pcm_uframes_t avail;
3595
3596 pcm_file = file->private_data;
3597
3598 substream = pcm_file->substream;
3599 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3600 ok = EPOLLOUT | EPOLLWRNORM;
3601 else
3602 ok = EPOLLIN | EPOLLRDNORM;
3603 if (PCM_RUNTIME_CHECK(substream))
3604 return ok | EPOLLERR;
3605
3606 runtime = substream->runtime;
3607 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3608 return ok | EPOLLERR;
3609
3610 poll_wait(file, &runtime->sleep, wait);
3611
3612 mask = 0;
3613 snd_pcm_stream_lock_irq(substream);
3614 avail = snd_pcm_avail(substream);
3615 switch (runtime->state) {
3616 case SNDRV_PCM_STATE_RUNNING:
3617 case SNDRV_PCM_STATE_PREPARED:
3618 case SNDRV_PCM_STATE_PAUSED:
3619 if (avail >= runtime->control->avail_min)
3620 mask = ok;
3621 break;
3622 case SNDRV_PCM_STATE_DRAINING:
3623 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3624 mask = ok;
3625 if (!avail)
3626 mask |= EPOLLERR;
3627 }
3628 break;
3629 default:
3630 mask = ok | EPOLLERR;
3631 break;
3632 }
3633 snd_pcm_stream_unlock_irq(substream);
3634 return mask;
3635}
3636
3637/*
3638 * mmap support
3639 */
3640
3641/*
3642 * Only on coherent architectures, we can mmap the status and the control records
3643 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3644 */
3645#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3646/*
3647 * mmap status record
3648 */
3649static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3650{
3651 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3652 struct snd_pcm_runtime *runtime;
3653
3654 if (substream == NULL)
3655 return VM_FAULT_SIGBUS;
3656 runtime = substream->runtime;
3657 vmf->page = virt_to_page(runtime->status);
3658 get_page(vmf->page);
3659 return 0;
3660}
3661
3662static const struct vm_operations_struct snd_pcm_vm_ops_status =
3663{
3664 .fault = snd_pcm_mmap_status_fault,
3665};
3666
3667static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3668 struct vm_area_struct *area)
3669{
3670 long size;
3671 if (!(area->vm_flags & VM_READ))
3672 return -EINVAL;
3673 size = area->vm_end - area->vm_start;
3674 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3675 return -EINVAL;
3676 area->vm_ops = &snd_pcm_vm_ops_status;
3677 area->vm_private_data = substream;
3678 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3679 area->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
3680 return 0;
3681}
3682
3683/*
3684 * mmap control record
3685 */
3686static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3687{
3688 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3689 struct snd_pcm_runtime *runtime;
3690
3691 if (substream == NULL)
3692 return VM_FAULT_SIGBUS;
3693 runtime = substream->runtime;
3694 vmf->page = virt_to_page(runtime->control);
3695 get_page(vmf->page);
3696 return 0;
3697}
3698
3699static const struct vm_operations_struct snd_pcm_vm_ops_control =
3700{
3701 .fault = snd_pcm_mmap_control_fault,
3702};
3703
3704static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3705 struct vm_area_struct *area)
3706{
3707 long size;
3708 if (!(area->vm_flags & VM_READ))
3709 return -EINVAL;
3710 size = area->vm_end - area->vm_start;
3711 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3712 return -EINVAL;
3713 area->vm_ops = &snd_pcm_vm_ops_control;
3714 area->vm_private_data = substream;
3715 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3716 return 0;
3717}
3718
3719static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3720{
3721 /* If drivers require the explicit sync (typically for non-coherent
3722 * pages), we have to disable the mmap of status and control data
3723 * to enforce the control via SYNC_PTR ioctl.
3724 */
3725 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3726 return false;
3727 /* See pcm_control_mmap_allowed() below.
3728 * Since older alsa-lib requires both status and control mmaps to be
3729 * coupled, we have to disable the status mmap for old alsa-lib, too.
3730 */
3731 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3732 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3733 return false;
3734 return true;
3735}
3736
3737static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3738{
3739 if (pcm_file->no_compat_mmap)
3740 return false;
3741 /* see above */
3742 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3743 return false;
3744 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3745 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3746 * thus it effectively assures the manual update of appl_ptr.
3747 */
3748 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3749 return false;
3750 return true;
3751}
3752
3753#else /* ! coherent mmap */
3754/*
3755 * don't support mmap for status and control records.
3756 */
3757#define pcm_status_mmap_allowed(pcm_file) false
3758#define pcm_control_mmap_allowed(pcm_file) false
3759
3760static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3761 struct vm_area_struct *area)
3762{
3763 return -ENXIO;
3764}
3765static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3766 struct vm_area_struct *area)
3767{
3768 return -ENXIO;
3769}
3770#endif /* coherent mmap */
3771
3772/*
3773 * fault callback for mmapping a RAM page
3774 */
3775static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3776{
3777 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3778 struct snd_pcm_runtime *runtime;
3779 unsigned long offset;
3780 struct page * page;
3781 size_t dma_bytes;
3782
3783 if (substream == NULL)
3784 return VM_FAULT_SIGBUS;
3785 runtime = substream->runtime;
3786 offset = vmf->pgoff << PAGE_SHIFT;
3787 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3788 if (offset > dma_bytes - PAGE_SIZE)
3789 return VM_FAULT_SIGBUS;
3790 if (substream->ops->page)
3791 page = substream->ops->page(substream, offset);
3792 else if (!snd_pcm_get_dma_buf(substream))
3793 page = virt_to_page(runtime->dma_area + offset);
3794 else
3795 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3796 if (!page)
3797 return VM_FAULT_SIGBUS;
3798 get_page(page);
3799 vmf->page = page;
3800 return 0;
3801}
3802
3803static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3804 .open = snd_pcm_mmap_data_open,
3805 .close = snd_pcm_mmap_data_close,
3806};
3807
3808static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3809 .open = snd_pcm_mmap_data_open,
3810 .close = snd_pcm_mmap_data_close,
3811 .fault = snd_pcm_mmap_data_fault,
3812};
3813
3814/*
3815 * mmap the DMA buffer on RAM
3816 */
3817
3818/**
3819 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3820 * @substream: PCM substream
3821 * @area: VMA
3822 *
3823 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3824 * this function is invoked implicitly.
3825 *
3826 * Return: zero if successful, or a negative error code
3827 */
3828int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3829 struct vm_area_struct *area)
3830{
3831 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3832 if (!substream->ops->page &&
3833 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3834 return 0;
3835 /* mmap with fault handler */
3836 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3837 return 0;
3838}
3839EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3840
3841/*
3842 * mmap the DMA buffer on I/O memory area
3843 */
3844#if SNDRV_PCM_INFO_MMAP_IOMEM
3845/**
3846 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3847 * @substream: PCM substream
3848 * @area: VMA
3849 *
3850 * When your hardware uses the iomapped pages as the hardware buffer and
3851 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3852 * is supposed to work only on limited architectures.
3853 *
3854 * Return: zero if successful, or a negative error code
3855 */
3856int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3857 struct vm_area_struct *area)
3858{
3859 struct snd_pcm_runtime *runtime = substream->runtime;
3860
3861 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3862 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3863}
3864EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3865#endif /* SNDRV_PCM_INFO_MMAP */
3866
3867/*
3868 * mmap DMA buffer
3869 */
3870int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3871 struct vm_area_struct *area)
3872{
3873 struct snd_pcm_runtime *runtime;
3874 long size;
3875 unsigned long offset;
3876 size_t dma_bytes;
3877 int err;
3878
3879 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3880 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3881 return -EINVAL;
3882 } else {
3883 if (!(area->vm_flags & VM_READ))
3884 return -EINVAL;
3885 }
3886 runtime = substream->runtime;
3887 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3888 return -EBADFD;
3889 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3890 return -ENXIO;
3891 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3892 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3893 return -EINVAL;
3894 size = area->vm_end - area->vm_start;
3895 offset = area->vm_pgoff << PAGE_SHIFT;
3896 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3897 if ((size_t)size > dma_bytes)
3898 return -EINVAL;
3899 if (offset > dma_bytes - size)
3900 return -EINVAL;
3901
3902 area->vm_ops = &snd_pcm_vm_ops_data;
3903 area->vm_private_data = substream;
3904 if (substream->ops->mmap)
3905 err = substream->ops->mmap(substream, area);
3906 else
3907 err = snd_pcm_lib_default_mmap(substream, area);
3908 if (!err)
3909 atomic_inc(&substream->mmap_count);
3910 return err;
3911}
3912EXPORT_SYMBOL(snd_pcm_mmap_data);
3913
3914static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3915{
3916 struct snd_pcm_file * pcm_file;
3917 struct snd_pcm_substream *substream;
3918 unsigned long offset;
3919
3920 pcm_file = file->private_data;
3921 substream = pcm_file->substream;
3922 if (PCM_RUNTIME_CHECK(substream))
3923 return -ENXIO;
3924 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3925 return -EBADFD;
3926
3927 offset = area->vm_pgoff << PAGE_SHIFT;
3928 switch (offset) {
3929 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3930 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3931 return -ENXIO;
3932 fallthrough;
3933 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3934 if (!pcm_status_mmap_allowed(pcm_file))
3935 return -ENXIO;
3936 return snd_pcm_mmap_status(substream, file, area);
3937 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3938 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3939 return -ENXIO;
3940 fallthrough;
3941 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3942 if (!pcm_control_mmap_allowed(pcm_file))
3943 return -ENXIO;
3944 return snd_pcm_mmap_control(substream, file, area);
3945 default:
3946 return snd_pcm_mmap_data(substream, file, area);
3947 }
3948 return 0;
3949}
3950
3951static int snd_pcm_fasync(int fd, struct file * file, int on)
3952{
3953 struct snd_pcm_file * pcm_file;
3954 struct snd_pcm_substream *substream;
3955 struct snd_pcm_runtime *runtime;
3956
3957 pcm_file = file->private_data;
3958 substream = pcm_file->substream;
3959 if (PCM_RUNTIME_CHECK(substream))
3960 return -ENXIO;
3961 runtime = substream->runtime;
3962 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3963 return -EBADFD;
3964 return snd_fasync_helper(fd, file, on, &runtime->fasync);
3965}
3966
3967/*
3968 * ioctl32 compat
3969 */
3970#ifdef CONFIG_COMPAT
3971#include "pcm_compat.c"
3972#else
3973#define snd_pcm_ioctl_compat NULL
3974#endif
3975
3976/*
3977 * To be removed helpers to keep binary compatibility
3978 */
3979
3980#ifdef CONFIG_SND_SUPPORT_OLD_API
3981#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3982#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3983
3984static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3985 struct snd_pcm_hw_params_old *oparams)
3986{
3987 unsigned int i;
3988
3989 memset(params, 0, sizeof(*params));
3990 params->flags = oparams->flags;
3991 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3992 params->masks[i].bits[0] = oparams->masks[i];
3993 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3994 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3995 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3996 params->info = oparams->info;
3997 params->msbits = oparams->msbits;
3998 params->rate_num = oparams->rate_num;
3999 params->rate_den = oparams->rate_den;
4000 params->fifo_size = oparams->fifo_size;
4001}
4002
4003static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
4004 struct snd_pcm_hw_params *params)
4005{
4006 unsigned int i;
4007
4008 memset(oparams, 0, sizeof(*oparams));
4009 oparams->flags = params->flags;
4010 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4011 oparams->masks[i] = params->masks[i].bits[0];
4012 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4013 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4014 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4015 oparams->info = params->info;
4016 oparams->msbits = params->msbits;
4017 oparams->rate_num = params->rate_num;
4018 oparams->rate_den = params->rate_den;
4019 oparams->fifo_size = params->fifo_size;
4020}
4021
4022static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4023 struct snd_pcm_hw_params_old __user * _oparams)
4024{
4025 struct snd_pcm_hw_params *params;
4026 struct snd_pcm_hw_params_old *oparams = NULL;
4027 int err;
4028
4029 params = kmalloc(sizeof(*params), GFP_KERNEL);
4030 if (!params)
4031 return -ENOMEM;
4032
4033 oparams = memdup_user(_oparams, sizeof(*oparams));
4034 if (IS_ERR(oparams)) {
4035 err = PTR_ERR(oparams);
4036 goto out;
4037 }
4038 snd_pcm_hw_convert_from_old_params(params, oparams);
4039 err = snd_pcm_hw_refine(substream, params);
4040 if (err < 0)
4041 goto out_old;
4042
4043 err = fixup_unreferenced_params(substream, params);
4044 if (err < 0)
4045 goto out_old;
4046
4047 snd_pcm_hw_convert_to_old_params(oparams, params);
4048 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4049 err = -EFAULT;
4050out_old:
4051 kfree(oparams);
4052out:
4053 kfree(params);
4054 return err;
4055}
4056
4057static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4058 struct snd_pcm_hw_params_old __user * _oparams)
4059{
4060 struct snd_pcm_hw_params *params;
4061 struct snd_pcm_hw_params_old *oparams = NULL;
4062 int err;
4063
4064 params = kmalloc(sizeof(*params), GFP_KERNEL);
4065 if (!params)
4066 return -ENOMEM;
4067
4068 oparams = memdup_user(_oparams, sizeof(*oparams));
4069 if (IS_ERR(oparams)) {
4070 err = PTR_ERR(oparams);
4071 goto out;
4072 }
4073
4074 snd_pcm_hw_convert_from_old_params(params, oparams);
4075 err = snd_pcm_hw_params(substream, params);
4076 if (err < 0)
4077 goto out_old;
4078
4079 snd_pcm_hw_convert_to_old_params(oparams, params);
4080 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4081 err = -EFAULT;
4082out_old:
4083 kfree(oparams);
4084out:
4085 kfree(params);
4086 return err;
4087}
4088#endif /* CONFIG_SND_SUPPORT_OLD_API */
4089
4090#ifndef CONFIG_MMU
4091static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4092 unsigned long addr,
4093 unsigned long len,
4094 unsigned long pgoff,
4095 unsigned long flags)
4096{
4097 struct snd_pcm_file *pcm_file = file->private_data;
4098 struct snd_pcm_substream *substream = pcm_file->substream;
4099 struct snd_pcm_runtime *runtime = substream->runtime;
4100 unsigned long offset = pgoff << PAGE_SHIFT;
4101
4102 switch (offset) {
4103 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4104 return (unsigned long)runtime->status;
4105 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4106 return (unsigned long)runtime->control;
4107 default:
4108 return (unsigned long)runtime->dma_area + offset;
4109 }
4110}
4111#else
4112# define snd_pcm_get_unmapped_area NULL
4113#endif
4114
4115/*
4116 * Register section
4117 */
4118
4119const struct file_operations snd_pcm_f_ops[2] = {
4120 {
4121 .owner = THIS_MODULE,
4122 .write = snd_pcm_write,
4123 .write_iter = snd_pcm_writev,
4124 .open = snd_pcm_playback_open,
4125 .release = snd_pcm_release,
4126 .llseek = no_llseek,
4127 .poll = snd_pcm_poll,
4128 .unlocked_ioctl = snd_pcm_ioctl,
4129 .compat_ioctl = snd_pcm_ioctl_compat,
4130 .mmap = snd_pcm_mmap,
4131 .fasync = snd_pcm_fasync,
4132 .get_unmapped_area = snd_pcm_get_unmapped_area,
4133 },
4134 {
4135 .owner = THIS_MODULE,
4136 .read = snd_pcm_read,
4137 .read_iter = snd_pcm_readv,
4138 .open = snd_pcm_capture_open,
4139 .release = snd_pcm_release,
4140 .llseek = no_llseek,
4141 .poll = snd_pcm_poll,
4142 .unlocked_ioctl = snd_pcm_ioctl,
4143 .compat_ioctl = snd_pcm_ioctl_compat,
4144 .mmap = snd_pcm_mmap,
4145 .fasync = snd_pcm_fasync,
4146 .get_unmapped_area = snd_pcm_get_unmapped_area,
4147 }
4148};
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/mm.h>
23#include <linux/module.h>
24#include <linux/file.h>
25#include <linux/slab.h>
26#include <linux/time.h>
27#include <linux/pm_qos.h>
28#include <linux/io.h>
29#include <linux/dma-mapping.h>
30#include <sound/core.h>
31#include <sound/control.h>
32#include <sound/info.h>
33#include <sound/pcm.h>
34#include <sound/pcm_params.h>
35#include <sound/timer.h>
36#include <sound/minors.h>
37#include <linux/uio.h>
38
39/*
40 * Compatibility
41 */
42
43struct snd_pcm_hw_params_old {
44 unsigned int flags;
45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
46 SNDRV_PCM_HW_PARAM_ACCESS + 1];
47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
49 unsigned int rmask;
50 unsigned int cmask;
51 unsigned int info;
52 unsigned int msbits;
53 unsigned int rate_num;
54 unsigned int rate_den;
55 snd_pcm_uframes_t fifo_size;
56 unsigned char reserved[64];
57};
58
59#ifdef CONFIG_SND_SUPPORT_OLD_API
60#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
61#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
62
63static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params_old __user * _oparams);
65static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67#endif
68static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
69
70/*
71 *
72 */
73
74static DEFINE_RWLOCK(snd_pcm_link_rwlock);
75static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77/* Writer in rwsem may block readers even during its waiting in queue,
78 * and this may lead to a deadlock when the code path takes read sem
79 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
80 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to
81 * spin until it gets the lock.
82 */
83static inline void down_write_nonblock(struct rw_semaphore *lock)
84{
85 while (!down_write_trylock(lock))
86 cond_resched();
87}
88
89/**
90 * snd_pcm_stream_lock - Lock the PCM stream
91 * @substream: PCM substream
92 *
93 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
94 * flag of the given substream. This also takes the global link rw lock
95 * (or rw sem), too, for avoiding the race with linked streams.
96 */
97void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
98{
99 if (substream->pcm->nonatomic) {
100 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
101 mutex_lock(&substream->self_group.mutex);
102 } else {
103 read_lock(&snd_pcm_link_rwlock);
104 spin_lock(&substream->self_group.lock);
105 }
106}
107EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
108
109/**
110 * snd_pcm_stream_lock - Unlock the PCM stream
111 * @substream: PCM substream
112 *
113 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
114 */
115void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
116{
117 if (substream->pcm->nonatomic) {
118 mutex_unlock(&substream->self_group.mutex);
119 up_read(&snd_pcm_link_rwsem);
120 } else {
121 spin_unlock(&substream->self_group.lock);
122 read_unlock(&snd_pcm_link_rwlock);
123 }
124}
125EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
126
127/**
128 * snd_pcm_stream_lock_irq - Lock the PCM stream
129 * @substream: PCM substream
130 *
131 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
132 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
133 * as snd_pcm_stream_lock().
134 */
135void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
136{
137 if (!substream->pcm->nonatomic)
138 local_irq_disable();
139 snd_pcm_stream_lock(substream);
140}
141EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
142
143/**
144 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
145 * @substream: PCM substream
146 *
147 * This is a counter-part of snd_pcm_stream_lock_irq().
148 */
149void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
150{
151 snd_pcm_stream_unlock(substream);
152 if (!substream->pcm->nonatomic)
153 local_irq_enable();
154}
155EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
156
157unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
158{
159 unsigned long flags = 0;
160 if (!substream->pcm->nonatomic)
161 local_irq_save(flags);
162 snd_pcm_stream_lock(substream);
163 return flags;
164}
165EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
166
167/**
168 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
169 * @substream: PCM substream
170 * @flags: irq flags
171 *
172 * This is a counter-part of snd_pcm_stream_lock_irqsave().
173 */
174void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
175 unsigned long flags)
176{
177 snd_pcm_stream_unlock(substream);
178 if (!substream->pcm->nonatomic)
179 local_irq_restore(flags);
180}
181EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
182
183static inline mm_segment_t snd_enter_user(void)
184{
185 mm_segment_t fs = get_fs();
186 set_fs(get_ds());
187 return fs;
188}
189
190static inline void snd_leave_user(mm_segment_t fs)
191{
192 set_fs(fs);
193}
194
195
196
197int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
198{
199 struct snd_pcm_runtime *runtime;
200 struct snd_pcm *pcm = substream->pcm;
201 struct snd_pcm_str *pstr = substream->pstr;
202
203 memset(info, 0, sizeof(*info));
204 info->card = pcm->card->number;
205 info->device = pcm->device;
206 info->stream = substream->stream;
207 info->subdevice = substream->number;
208 strlcpy(info->id, pcm->id, sizeof(info->id));
209 strlcpy(info->name, pcm->name, sizeof(info->name));
210 info->dev_class = pcm->dev_class;
211 info->dev_subclass = pcm->dev_subclass;
212 info->subdevices_count = pstr->substream_count;
213 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
214 strlcpy(info->subname, substream->name, sizeof(info->subname));
215 runtime = substream->runtime;
216 /* AB: FIXME!!! This is definitely nonsense */
217 if (runtime) {
218 info->sync = runtime->sync;
219 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
220 }
221 return 0;
222}
223
224int snd_pcm_info_user(struct snd_pcm_substream *substream,
225 struct snd_pcm_info __user * _info)
226{
227 struct snd_pcm_info *info;
228 int err;
229
230 info = kmalloc(sizeof(*info), GFP_KERNEL);
231 if (! info)
232 return -ENOMEM;
233 err = snd_pcm_info(substream, info);
234 if (err >= 0) {
235 if (copy_to_user(_info, info, sizeof(*info)))
236 err = -EFAULT;
237 }
238 kfree(info);
239 return err;
240}
241
242static bool hw_support_mmap(struct snd_pcm_substream *substream)
243{
244 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
245 return false;
246 /* check architectures that return -EINVAL from dma_mmap_coherent() */
247 /* FIXME: this should be some global flag */
248#if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
249 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
250 if (!substream->ops->mmap &&
251 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
252 return false;
253#endif
254 return true;
255}
256
257#undef RULES_DEBUG
258
259#ifdef RULES_DEBUG
260#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
261static const char * const snd_pcm_hw_param_names[] = {
262 HW_PARAM(ACCESS),
263 HW_PARAM(FORMAT),
264 HW_PARAM(SUBFORMAT),
265 HW_PARAM(SAMPLE_BITS),
266 HW_PARAM(FRAME_BITS),
267 HW_PARAM(CHANNELS),
268 HW_PARAM(RATE),
269 HW_PARAM(PERIOD_TIME),
270 HW_PARAM(PERIOD_SIZE),
271 HW_PARAM(PERIOD_BYTES),
272 HW_PARAM(PERIODS),
273 HW_PARAM(BUFFER_TIME),
274 HW_PARAM(BUFFER_SIZE),
275 HW_PARAM(BUFFER_BYTES),
276 HW_PARAM(TICK_TIME),
277};
278#endif
279
280int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
281 struct snd_pcm_hw_params *params)
282{
283 unsigned int k;
284 struct snd_pcm_hardware *hw;
285 struct snd_interval *i = NULL;
286 struct snd_mask *m = NULL;
287 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
288 unsigned int rstamps[constrs->rules_num];
289 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
290 unsigned int stamp = 2;
291 int changed, again;
292
293 params->info = 0;
294 params->fifo_size = 0;
295 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
296 params->msbits = 0;
297 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
298 params->rate_num = 0;
299 params->rate_den = 0;
300 }
301
302 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
303 m = hw_param_mask(params, k);
304 if (snd_mask_empty(m))
305 return -EINVAL;
306 if (!(params->rmask & (1 << k)))
307 continue;
308#ifdef RULES_DEBUG
309 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
310 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
311#endif
312 changed = snd_mask_refine(m, constrs_mask(constrs, k));
313#ifdef RULES_DEBUG
314 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
315#endif
316 if (changed)
317 params->cmask |= 1 << k;
318 if (changed < 0)
319 return changed;
320 }
321
322 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
323 i = hw_param_interval(params, k);
324 if (snd_interval_empty(i))
325 return -EINVAL;
326 if (!(params->rmask & (1 << k)))
327 continue;
328#ifdef RULES_DEBUG
329 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
330 if (i->empty)
331 pr_cont("empty");
332 else
333 pr_cont("%c%u %u%c",
334 i->openmin ? '(' : '[', i->min,
335 i->max, i->openmax ? ')' : ']');
336 pr_cont(" -> ");
337#endif
338 changed = snd_interval_refine(i, constrs_interval(constrs, k));
339#ifdef RULES_DEBUG
340 if (i->empty)
341 pr_cont("empty\n");
342 else
343 pr_cont("%c%u %u%c\n",
344 i->openmin ? '(' : '[', i->min,
345 i->max, i->openmax ? ')' : ']');
346#endif
347 if (changed)
348 params->cmask |= 1 << k;
349 if (changed < 0)
350 return changed;
351 }
352
353 for (k = 0; k < constrs->rules_num; k++)
354 rstamps[k] = 0;
355 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
356 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
357 do {
358 again = 0;
359 for (k = 0; k < constrs->rules_num; k++) {
360 struct snd_pcm_hw_rule *r = &constrs->rules[k];
361 unsigned int d;
362 int doit = 0;
363 if (r->cond && !(r->cond & params->flags))
364 continue;
365 for (d = 0; r->deps[d] >= 0; d++) {
366 if (vstamps[r->deps[d]] > rstamps[k]) {
367 doit = 1;
368 break;
369 }
370 }
371 if (!doit)
372 continue;
373#ifdef RULES_DEBUG
374 pr_debug("Rule %d [%p]: ", k, r->func);
375 if (r->var >= 0) {
376 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
377 if (hw_is_mask(r->var)) {
378 m = hw_param_mask(params, r->var);
379 pr_cont("%x", *m->bits);
380 } else {
381 i = hw_param_interval(params, r->var);
382 if (i->empty)
383 pr_cont("empty");
384 else
385 pr_cont("%c%u %u%c",
386 i->openmin ? '(' : '[', i->min,
387 i->max, i->openmax ? ')' : ']');
388 }
389 }
390#endif
391 changed = r->func(params, r);
392#ifdef RULES_DEBUG
393 if (r->var >= 0) {
394 pr_cont(" -> ");
395 if (hw_is_mask(r->var))
396 pr_cont("%x", *m->bits);
397 else {
398 if (i->empty)
399 pr_cont("empty");
400 else
401 pr_cont("%c%u %u%c",
402 i->openmin ? '(' : '[', i->min,
403 i->max, i->openmax ? ')' : ']');
404 }
405 }
406 pr_cont("\n");
407#endif
408 rstamps[k] = stamp;
409 if (changed && r->var >= 0) {
410 params->cmask |= (1 << r->var);
411 vstamps[r->var] = stamp;
412 again = 1;
413 }
414 if (changed < 0)
415 return changed;
416 stamp++;
417 }
418 } while (again);
419 if (!params->msbits) {
420 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
421 if (snd_interval_single(i))
422 params->msbits = snd_interval_value(i);
423 }
424
425 if (!params->rate_den) {
426 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
427 if (snd_interval_single(i)) {
428 params->rate_num = snd_interval_value(i);
429 params->rate_den = 1;
430 }
431 }
432
433 hw = &substream->runtime->hw;
434 if (!params->info) {
435 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
436 SNDRV_PCM_INFO_DRAIN_TRIGGER);
437 if (!hw_support_mmap(substream))
438 params->info &= ~(SNDRV_PCM_INFO_MMAP |
439 SNDRV_PCM_INFO_MMAP_VALID);
440 }
441 if (!params->fifo_size) {
442 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
443 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
444 if (snd_mask_min(m) == snd_mask_max(m) &&
445 snd_interval_min(i) == snd_interval_max(i)) {
446 changed = substream->ops->ioctl(substream,
447 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
448 if (changed < 0)
449 return changed;
450 }
451 }
452 params->rmask = 0;
453 return 0;
454}
455
456EXPORT_SYMBOL(snd_pcm_hw_refine);
457
458static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
459 struct snd_pcm_hw_params __user * _params)
460{
461 struct snd_pcm_hw_params *params;
462 int err;
463
464 params = memdup_user(_params, sizeof(*params));
465 if (IS_ERR(params))
466 return PTR_ERR(params);
467
468 err = snd_pcm_hw_refine(substream, params);
469 if (copy_to_user(_params, params, sizeof(*params))) {
470 if (!err)
471 err = -EFAULT;
472 }
473
474 kfree(params);
475 return err;
476}
477
478static int period_to_usecs(struct snd_pcm_runtime *runtime)
479{
480 int usecs;
481
482 if (! runtime->rate)
483 return -1; /* invalid */
484
485 /* take 75% of period time as the deadline */
486 usecs = (750000 / runtime->rate) * runtime->period_size;
487 usecs += ((750000 % runtime->rate) * runtime->period_size) /
488 runtime->rate;
489
490 return usecs;
491}
492
493static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
494{
495 snd_pcm_stream_lock_irq(substream);
496 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
497 substream->runtime->status->state = state;
498 snd_pcm_stream_unlock_irq(substream);
499}
500
501static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
502 int event)
503{
504#ifdef CONFIG_SND_PCM_TIMER
505 if (substream->timer)
506 snd_timer_notify(substream->timer, event,
507 &substream->runtime->trigger_tstamp);
508#endif
509}
510
511static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
512 struct snd_pcm_hw_params *params)
513{
514 struct snd_pcm_runtime *runtime;
515 int err, usecs;
516 unsigned int bits;
517 snd_pcm_uframes_t frames;
518
519 if (PCM_RUNTIME_CHECK(substream))
520 return -ENXIO;
521 runtime = substream->runtime;
522 snd_pcm_stream_lock_irq(substream);
523 switch (runtime->status->state) {
524 case SNDRV_PCM_STATE_OPEN:
525 case SNDRV_PCM_STATE_SETUP:
526 case SNDRV_PCM_STATE_PREPARED:
527 break;
528 default:
529 snd_pcm_stream_unlock_irq(substream);
530 return -EBADFD;
531 }
532 snd_pcm_stream_unlock_irq(substream);
533#if IS_ENABLED(CONFIG_SND_PCM_OSS)
534 if (!substream->oss.oss)
535#endif
536 if (atomic_read(&substream->mmap_count))
537 return -EBADFD;
538
539 params->rmask = ~0U;
540 err = snd_pcm_hw_refine(substream, params);
541 if (err < 0)
542 goto _error;
543
544 err = snd_pcm_hw_params_choose(substream, params);
545 if (err < 0)
546 goto _error;
547
548 if (substream->ops->hw_params != NULL) {
549 err = substream->ops->hw_params(substream, params);
550 if (err < 0)
551 goto _error;
552 }
553
554 runtime->access = params_access(params);
555 runtime->format = params_format(params);
556 runtime->subformat = params_subformat(params);
557 runtime->channels = params_channels(params);
558 runtime->rate = params_rate(params);
559 runtime->period_size = params_period_size(params);
560 runtime->periods = params_periods(params);
561 runtime->buffer_size = params_buffer_size(params);
562 runtime->info = params->info;
563 runtime->rate_num = params->rate_num;
564 runtime->rate_den = params->rate_den;
565 runtime->no_period_wakeup =
566 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
567 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
568
569 bits = snd_pcm_format_physical_width(runtime->format);
570 runtime->sample_bits = bits;
571 bits *= runtime->channels;
572 runtime->frame_bits = bits;
573 frames = 1;
574 while (bits % 8 != 0) {
575 bits *= 2;
576 frames *= 2;
577 }
578 runtime->byte_align = bits / 8;
579 runtime->min_align = frames;
580
581 /* Default sw params */
582 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
583 runtime->period_step = 1;
584 runtime->control->avail_min = runtime->period_size;
585 runtime->start_threshold = 1;
586 runtime->stop_threshold = runtime->buffer_size;
587 runtime->silence_threshold = 0;
588 runtime->silence_size = 0;
589 runtime->boundary = runtime->buffer_size;
590 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
591 runtime->boundary *= 2;
592
593 snd_pcm_timer_resolution_change(substream);
594 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
595
596 if (pm_qos_request_active(&substream->latency_pm_qos_req))
597 pm_qos_remove_request(&substream->latency_pm_qos_req);
598 if ((usecs = period_to_usecs(runtime)) >= 0)
599 pm_qos_add_request(&substream->latency_pm_qos_req,
600 PM_QOS_CPU_DMA_LATENCY, usecs);
601 return 0;
602 _error:
603 /* hardware might be unusable from this time,
604 so we force application to retry to set
605 the correct hardware parameter settings */
606 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
607 if (substream->ops->hw_free != NULL)
608 substream->ops->hw_free(substream);
609 return err;
610}
611
612static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
613 struct snd_pcm_hw_params __user * _params)
614{
615 struct snd_pcm_hw_params *params;
616 int err;
617
618 params = memdup_user(_params, sizeof(*params));
619 if (IS_ERR(params))
620 return PTR_ERR(params);
621
622 err = snd_pcm_hw_params(substream, params);
623 if (copy_to_user(_params, params, sizeof(*params))) {
624 if (!err)
625 err = -EFAULT;
626 }
627
628 kfree(params);
629 return err;
630}
631
632static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
633{
634 struct snd_pcm_runtime *runtime;
635 int result = 0;
636
637 if (PCM_RUNTIME_CHECK(substream))
638 return -ENXIO;
639 runtime = substream->runtime;
640 snd_pcm_stream_lock_irq(substream);
641 switch (runtime->status->state) {
642 case SNDRV_PCM_STATE_SETUP:
643 case SNDRV_PCM_STATE_PREPARED:
644 break;
645 default:
646 snd_pcm_stream_unlock_irq(substream);
647 return -EBADFD;
648 }
649 snd_pcm_stream_unlock_irq(substream);
650 if (atomic_read(&substream->mmap_count))
651 return -EBADFD;
652 if (substream->ops->hw_free)
653 result = substream->ops->hw_free(substream);
654 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
655 pm_qos_remove_request(&substream->latency_pm_qos_req);
656 return result;
657}
658
659static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
660 struct snd_pcm_sw_params *params)
661{
662 struct snd_pcm_runtime *runtime;
663 int err;
664
665 if (PCM_RUNTIME_CHECK(substream))
666 return -ENXIO;
667 runtime = substream->runtime;
668 snd_pcm_stream_lock_irq(substream);
669 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
670 snd_pcm_stream_unlock_irq(substream);
671 return -EBADFD;
672 }
673 snd_pcm_stream_unlock_irq(substream);
674
675 if (params->tstamp_mode < 0 ||
676 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
677 return -EINVAL;
678 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
679 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
680 return -EINVAL;
681 if (params->avail_min == 0)
682 return -EINVAL;
683 if (params->silence_size >= runtime->boundary) {
684 if (params->silence_threshold != 0)
685 return -EINVAL;
686 } else {
687 if (params->silence_size > params->silence_threshold)
688 return -EINVAL;
689 if (params->silence_threshold > runtime->buffer_size)
690 return -EINVAL;
691 }
692 err = 0;
693 snd_pcm_stream_lock_irq(substream);
694 runtime->tstamp_mode = params->tstamp_mode;
695 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
696 runtime->tstamp_type = params->tstamp_type;
697 runtime->period_step = params->period_step;
698 runtime->control->avail_min = params->avail_min;
699 runtime->start_threshold = params->start_threshold;
700 runtime->stop_threshold = params->stop_threshold;
701 runtime->silence_threshold = params->silence_threshold;
702 runtime->silence_size = params->silence_size;
703 params->boundary = runtime->boundary;
704 if (snd_pcm_running(substream)) {
705 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
706 runtime->silence_size > 0)
707 snd_pcm_playback_silence(substream, ULONG_MAX);
708 err = snd_pcm_update_state(substream, runtime);
709 }
710 snd_pcm_stream_unlock_irq(substream);
711 return err;
712}
713
714static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
715 struct snd_pcm_sw_params __user * _params)
716{
717 struct snd_pcm_sw_params params;
718 int err;
719 if (copy_from_user(¶ms, _params, sizeof(params)))
720 return -EFAULT;
721 err = snd_pcm_sw_params(substream, ¶ms);
722 if (copy_to_user(_params, ¶ms, sizeof(params)))
723 return -EFAULT;
724 return err;
725}
726
727int snd_pcm_status(struct snd_pcm_substream *substream,
728 struct snd_pcm_status *status)
729{
730 struct snd_pcm_runtime *runtime = substream->runtime;
731
732 snd_pcm_stream_lock_irq(substream);
733
734 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
735 &runtime->audio_tstamp_config);
736
737 /* backwards compatible behavior */
738 if (runtime->audio_tstamp_config.type_requested ==
739 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
740 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
741 runtime->audio_tstamp_config.type_requested =
742 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
743 else
744 runtime->audio_tstamp_config.type_requested =
745 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
746 runtime->audio_tstamp_report.valid = 0;
747 } else
748 runtime->audio_tstamp_report.valid = 1;
749
750 status->state = runtime->status->state;
751 status->suspended_state = runtime->status->suspended_state;
752 if (status->state == SNDRV_PCM_STATE_OPEN)
753 goto _end;
754 status->trigger_tstamp = runtime->trigger_tstamp;
755 if (snd_pcm_running(substream)) {
756 snd_pcm_update_hw_ptr(substream);
757 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
758 status->tstamp = runtime->status->tstamp;
759 status->driver_tstamp = runtime->driver_tstamp;
760 status->audio_tstamp =
761 runtime->status->audio_tstamp;
762 if (runtime->audio_tstamp_report.valid == 1)
763 /* backwards compatibility, no report provided in COMPAT mode */
764 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
765 &status->audio_tstamp_accuracy,
766 &runtime->audio_tstamp_report);
767
768 goto _tstamp_end;
769 }
770 } else {
771 /* get tstamp only in fallback mode and only if enabled */
772 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
773 snd_pcm_gettime(runtime, &status->tstamp);
774 }
775 _tstamp_end:
776 status->appl_ptr = runtime->control->appl_ptr;
777 status->hw_ptr = runtime->status->hw_ptr;
778 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
779 status->avail = snd_pcm_playback_avail(runtime);
780 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
781 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
782 status->delay = runtime->buffer_size - status->avail;
783 status->delay += runtime->delay;
784 } else
785 status->delay = 0;
786 } else {
787 status->avail = snd_pcm_capture_avail(runtime);
788 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
789 status->delay = status->avail + runtime->delay;
790 else
791 status->delay = 0;
792 }
793 status->avail_max = runtime->avail_max;
794 status->overrange = runtime->overrange;
795 runtime->avail_max = 0;
796 runtime->overrange = 0;
797 _end:
798 snd_pcm_stream_unlock_irq(substream);
799 return 0;
800}
801
802static int snd_pcm_status_user(struct snd_pcm_substream *substream,
803 struct snd_pcm_status __user * _status,
804 bool ext)
805{
806 struct snd_pcm_status status;
807 int res;
808
809 memset(&status, 0, sizeof(status));
810 /*
811 * with extension, parameters are read/write,
812 * get audio_tstamp_data from user,
813 * ignore rest of status structure
814 */
815 if (ext && get_user(status.audio_tstamp_data,
816 (u32 __user *)(&_status->audio_tstamp_data)))
817 return -EFAULT;
818 res = snd_pcm_status(substream, &status);
819 if (res < 0)
820 return res;
821 if (copy_to_user(_status, &status, sizeof(status)))
822 return -EFAULT;
823 return 0;
824}
825
826static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
827 struct snd_pcm_channel_info * info)
828{
829 struct snd_pcm_runtime *runtime;
830 unsigned int channel;
831
832 channel = info->channel;
833 runtime = substream->runtime;
834 snd_pcm_stream_lock_irq(substream);
835 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
836 snd_pcm_stream_unlock_irq(substream);
837 return -EBADFD;
838 }
839 snd_pcm_stream_unlock_irq(substream);
840 if (channel >= runtime->channels)
841 return -EINVAL;
842 memset(info, 0, sizeof(*info));
843 info->channel = channel;
844 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
845}
846
847static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
848 struct snd_pcm_channel_info __user * _info)
849{
850 struct snd_pcm_channel_info info;
851 int res;
852
853 if (copy_from_user(&info, _info, sizeof(info)))
854 return -EFAULT;
855 res = snd_pcm_channel_info(substream, &info);
856 if (res < 0)
857 return res;
858 if (copy_to_user(_info, &info, sizeof(info)))
859 return -EFAULT;
860 return 0;
861}
862
863static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
864{
865 struct snd_pcm_runtime *runtime = substream->runtime;
866 if (runtime->trigger_master == NULL)
867 return;
868 if (runtime->trigger_master == substream) {
869 if (!runtime->trigger_tstamp_latched)
870 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
871 } else {
872 snd_pcm_trigger_tstamp(runtime->trigger_master);
873 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
874 }
875 runtime->trigger_master = NULL;
876}
877
878struct action_ops {
879 int (*pre_action)(struct snd_pcm_substream *substream, int state);
880 int (*do_action)(struct snd_pcm_substream *substream, int state);
881 void (*undo_action)(struct snd_pcm_substream *substream, int state);
882 void (*post_action)(struct snd_pcm_substream *substream, int state);
883};
884
885/*
886 * this functions is core for handling of linked stream
887 * Note: the stream state might be changed also on failure
888 * Note2: call with calling stream lock + link lock
889 */
890static int snd_pcm_action_group(const struct action_ops *ops,
891 struct snd_pcm_substream *substream,
892 int state, int do_lock)
893{
894 struct snd_pcm_substream *s = NULL;
895 struct snd_pcm_substream *s1;
896 int res = 0, depth = 1;
897
898 snd_pcm_group_for_each_entry(s, substream) {
899 if (do_lock && s != substream) {
900 if (s->pcm->nonatomic)
901 mutex_lock_nested(&s->self_group.mutex, depth);
902 else
903 spin_lock_nested(&s->self_group.lock, depth);
904 depth++;
905 }
906 res = ops->pre_action(s, state);
907 if (res < 0)
908 goto _unlock;
909 }
910 snd_pcm_group_for_each_entry(s, substream) {
911 res = ops->do_action(s, state);
912 if (res < 0) {
913 if (ops->undo_action) {
914 snd_pcm_group_for_each_entry(s1, substream) {
915 if (s1 == s) /* failed stream */
916 break;
917 ops->undo_action(s1, state);
918 }
919 }
920 s = NULL; /* unlock all */
921 goto _unlock;
922 }
923 }
924 snd_pcm_group_for_each_entry(s, substream) {
925 ops->post_action(s, state);
926 }
927 _unlock:
928 if (do_lock) {
929 /* unlock streams */
930 snd_pcm_group_for_each_entry(s1, substream) {
931 if (s1 != substream) {
932 if (s1->pcm->nonatomic)
933 mutex_unlock(&s1->self_group.mutex);
934 else
935 spin_unlock(&s1->self_group.lock);
936 }
937 if (s1 == s) /* end */
938 break;
939 }
940 }
941 return res;
942}
943
944/*
945 * Note: call with stream lock
946 */
947static int snd_pcm_action_single(const struct action_ops *ops,
948 struct snd_pcm_substream *substream,
949 int state)
950{
951 int res;
952
953 res = ops->pre_action(substream, state);
954 if (res < 0)
955 return res;
956 res = ops->do_action(substream, state);
957 if (res == 0)
958 ops->post_action(substream, state);
959 else if (ops->undo_action)
960 ops->undo_action(substream, state);
961 return res;
962}
963
964/*
965 * Note: call with stream lock
966 */
967static int snd_pcm_action(const struct action_ops *ops,
968 struct snd_pcm_substream *substream,
969 int state)
970{
971 int res;
972
973 if (!snd_pcm_stream_linked(substream))
974 return snd_pcm_action_single(ops, substream, state);
975
976 if (substream->pcm->nonatomic) {
977 if (!mutex_trylock(&substream->group->mutex)) {
978 mutex_unlock(&substream->self_group.mutex);
979 mutex_lock(&substream->group->mutex);
980 mutex_lock(&substream->self_group.mutex);
981 }
982 res = snd_pcm_action_group(ops, substream, state, 1);
983 mutex_unlock(&substream->group->mutex);
984 } else {
985 if (!spin_trylock(&substream->group->lock)) {
986 spin_unlock(&substream->self_group.lock);
987 spin_lock(&substream->group->lock);
988 spin_lock(&substream->self_group.lock);
989 }
990 res = snd_pcm_action_group(ops, substream, state, 1);
991 spin_unlock(&substream->group->lock);
992 }
993 return res;
994}
995
996/*
997 * Note: don't use any locks before
998 */
999static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1000 struct snd_pcm_substream *substream,
1001 int state)
1002{
1003 int res;
1004
1005 snd_pcm_stream_lock_irq(substream);
1006 res = snd_pcm_action(ops, substream, state);
1007 snd_pcm_stream_unlock_irq(substream);
1008 return res;
1009}
1010
1011/*
1012 */
1013static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1014 struct snd_pcm_substream *substream,
1015 int state)
1016{
1017 int res;
1018
1019 down_read(&snd_pcm_link_rwsem);
1020 if (snd_pcm_stream_linked(substream))
1021 res = snd_pcm_action_group(ops, substream, state, 0);
1022 else
1023 res = snd_pcm_action_single(ops, substream, state);
1024 up_read(&snd_pcm_link_rwsem);
1025 return res;
1026}
1027
1028/*
1029 * start callbacks
1030 */
1031static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1032{
1033 struct snd_pcm_runtime *runtime = substream->runtime;
1034 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1035 return -EBADFD;
1036 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1037 !snd_pcm_playback_data(substream))
1038 return -EPIPE;
1039 runtime->trigger_tstamp_latched = false;
1040 runtime->trigger_master = substream;
1041 return 0;
1042}
1043
1044static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1045{
1046 if (substream->runtime->trigger_master != substream)
1047 return 0;
1048 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1049}
1050
1051static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1052{
1053 if (substream->runtime->trigger_master == substream)
1054 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1055}
1056
1057static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1058{
1059 struct snd_pcm_runtime *runtime = substream->runtime;
1060 snd_pcm_trigger_tstamp(substream);
1061 runtime->hw_ptr_jiffies = jiffies;
1062 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1063 runtime->rate;
1064 runtime->status->state = state;
1065 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1066 runtime->silence_size > 0)
1067 snd_pcm_playback_silence(substream, ULONG_MAX);
1068 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1069}
1070
1071static const struct action_ops snd_pcm_action_start = {
1072 .pre_action = snd_pcm_pre_start,
1073 .do_action = snd_pcm_do_start,
1074 .undo_action = snd_pcm_undo_start,
1075 .post_action = snd_pcm_post_start
1076};
1077
1078/**
1079 * snd_pcm_start - start all linked streams
1080 * @substream: the PCM substream instance
1081 *
1082 * Return: Zero if successful, or a negative error code.
1083 */
1084int snd_pcm_start(struct snd_pcm_substream *substream)
1085{
1086 return snd_pcm_action(&snd_pcm_action_start, substream,
1087 SNDRV_PCM_STATE_RUNNING);
1088}
1089
1090/*
1091 * stop callbacks
1092 */
1093static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1094{
1095 struct snd_pcm_runtime *runtime = substream->runtime;
1096 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1097 return -EBADFD;
1098 runtime->trigger_master = substream;
1099 return 0;
1100}
1101
1102static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1103{
1104 if (substream->runtime->trigger_master == substream &&
1105 snd_pcm_running(substream))
1106 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1107 return 0; /* unconditonally stop all substreams */
1108}
1109
1110static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1111{
1112 struct snd_pcm_runtime *runtime = substream->runtime;
1113 if (runtime->status->state != state) {
1114 snd_pcm_trigger_tstamp(substream);
1115 runtime->status->state = state;
1116 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1117 }
1118 wake_up(&runtime->sleep);
1119 wake_up(&runtime->tsleep);
1120}
1121
1122static const struct action_ops snd_pcm_action_stop = {
1123 .pre_action = snd_pcm_pre_stop,
1124 .do_action = snd_pcm_do_stop,
1125 .post_action = snd_pcm_post_stop
1126};
1127
1128/**
1129 * snd_pcm_stop - try to stop all running streams in the substream group
1130 * @substream: the PCM substream instance
1131 * @state: PCM state after stopping the stream
1132 *
1133 * The state of each stream is then changed to the given state unconditionally.
1134 *
1135 * Return: Zero if successful, or a negative error code.
1136 */
1137int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1138{
1139 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1140}
1141
1142EXPORT_SYMBOL(snd_pcm_stop);
1143
1144/**
1145 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1146 * @substream: the PCM substream
1147 *
1148 * After stopping, the state is changed to SETUP.
1149 * Unlike snd_pcm_stop(), this affects only the given stream.
1150 *
1151 * Return: Zero if succesful, or a negative error code.
1152 */
1153int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1154{
1155 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1156 SNDRV_PCM_STATE_SETUP);
1157}
1158
1159/**
1160 * snd_pcm_stop_xrun - stop the running streams as XRUN
1161 * @substream: the PCM substream instance
1162 *
1163 * This stops the given running substream (and all linked substreams) as XRUN.
1164 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1165 *
1166 * Return: Zero if successful, or a negative error code.
1167 */
1168int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1169{
1170 unsigned long flags;
1171 int ret = 0;
1172
1173 snd_pcm_stream_lock_irqsave(substream, flags);
1174 if (snd_pcm_running(substream))
1175 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1176 snd_pcm_stream_unlock_irqrestore(substream, flags);
1177 return ret;
1178}
1179EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1180
1181/*
1182 * pause callbacks
1183 */
1184static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1185{
1186 struct snd_pcm_runtime *runtime = substream->runtime;
1187 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1188 return -ENOSYS;
1189 if (push) {
1190 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1191 return -EBADFD;
1192 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1193 return -EBADFD;
1194 runtime->trigger_master = substream;
1195 return 0;
1196}
1197
1198static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1199{
1200 if (substream->runtime->trigger_master != substream)
1201 return 0;
1202 /* some drivers might use hw_ptr to recover from the pause -
1203 update the hw_ptr now */
1204 if (push)
1205 snd_pcm_update_hw_ptr(substream);
1206 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1207 * a delta between the current jiffies, this gives a large enough
1208 * delta, effectively to skip the check once.
1209 */
1210 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1211 return substream->ops->trigger(substream,
1212 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1213 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1214}
1215
1216static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1217{
1218 if (substream->runtime->trigger_master == substream)
1219 substream->ops->trigger(substream,
1220 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1221 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1222}
1223
1224static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1225{
1226 struct snd_pcm_runtime *runtime = substream->runtime;
1227 snd_pcm_trigger_tstamp(substream);
1228 if (push) {
1229 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1230 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1231 wake_up(&runtime->sleep);
1232 wake_up(&runtime->tsleep);
1233 } else {
1234 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1235 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1236 }
1237}
1238
1239static const struct action_ops snd_pcm_action_pause = {
1240 .pre_action = snd_pcm_pre_pause,
1241 .do_action = snd_pcm_do_pause,
1242 .undo_action = snd_pcm_undo_pause,
1243 .post_action = snd_pcm_post_pause
1244};
1245
1246/*
1247 * Push/release the pause for all linked streams.
1248 */
1249static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1250{
1251 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1252}
1253
1254#ifdef CONFIG_PM
1255/* suspend */
1256
1257static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1258{
1259 struct snd_pcm_runtime *runtime = substream->runtime;
1260 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1261 return -EBUSY;
1262 runtime->trigger_master = substream;
1263 return 0;
1264}
1265
1266static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1267{
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 if (runtime->trigger_master != substream)
1270 return 0;
1271 if (! snd_pcm_running(substream))
1272 return 0;
1273 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1274 return 0; /* suspend unconditionally */
1275}
1276
1277static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1278{
1279 struct snd_pcm_runtime *runtime = substream->runtime;
1280 snd_pcm_trigger_tstamp(substream);
1281 runtime->status->suspended_state = runtime->status->state;
1282 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1283 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1284 wake_up(&runtime->sleep);
1285 wake_up(&runtime->tsleep);
1286}
1287
1288static const struct action_ops snd_pcm_action_suspend = {
1289 .pre_action = snd_pcm_pre_suspend,
1290 .do_action = snd_pcm_do_suspend,
1291 .post_action = snd_pcm_post_suspend
1292};
1293
1294/**
1295 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1296 * @substream: the PCM substream
1297 *
1298 * After this call, all streams are changed to SUSPENDED state.
1299 *
1300 * Return: Zero if successful (or @substream is %NULL), or a negative error
1301 * code.
1302 */
1303int snd_pcm_suspend(struct snd_pcm_substream *substream)
1304{
1305 int err;
1306 unsigned long flags;
1307
1308 if (! substream)
1309 return 0;
1310
1311 snd_pcm_stream_lock_irqsave(substream, flags);
1312 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1313 snd_pcm_stream_unlock_irqrestore(substream, flags);
1314 return err;
1315}
1316
1317EXPORT_SYMBOL(snd_pcm_suspend);
1318
1319/**
1320 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1321 * @pcm: the PCM instance
1322 *
1323 * After this call, all streams are changed to SUSPENDED state.
1324 *
1325 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1326 */
1327int snd_pcm_suspend_all(struct snd_pcm *pcm)
1328{
1329 struct snd_pcm_substream *substream;
1330 int stream, err = 0;
1331
1332 if (! pcm)
1333 return 0;
1334
1335 for (stream = 0; stream < 2; stream++) {
1336 for (substream = pcm->streams[stream].substream;
1337 substream; substream = substream->next) {
1338 /* FIXME: the open/close code should lock this as well */
1339 if (substream->runtime == NULL)
1340 continue;
1341 err = snd_pcm_suspend(substream);
1342 if (err < 0 && err != -EBUSY)
1343 return err;
1344 }
1345 }
1346 return 0;
1347}
1348
1349EXPORT_SYMBOL(snd_pcm_suspend_all);
1350
1351/* resume */
1352
1353static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1354{
1355 struct snd_pcm_runtime *runtime = substream->runtime;
1356 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1357 return -ENOSYS;
1358 runtime->trigger_master = substream;
1359 return 0;
1360}
1361
1362static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1363{
1364 struct snd_pcm_runtime *runtime = substream->runtime;
1365 if (runtime->trigger_master != substream)
1366 return 0;
1367 /* DMA not running previously? */
1368 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1369 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1370 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1371 return 0;
1372 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1373}
1374
1375static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1376{
1377 if (substream->runtime->trigger_master == substream &&
1378 snd_pcm_running(substream))
1379 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1380}
1381
1382static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1383{
1384 struct snd_pcm_runtime *runtime = substream->runtime;
1385 snd_pcm_trigger_tstamp(substream);
1386 runtime->status->state = runtime->status->suspended_state;
1387 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1388}
1389
1390static const struct action_ops snd_pcm_action_resume = {
1391 .pre_action = snd_pcm_pre_resume,
1392 .do_action = snd_pcm_do_resume,
1393 .undo_action = snd_pcm_undo_resume,
1394 .post_action = snd_pcm_post_resume
1395};
1396
1397static int snd_pcm_resume(struct snd_pcm_substream *substream)
1398{
1399 struct snd_card *card = substream->pcm->card;
1400 int res;
1401
1402 snd_power_lock(card);
1403 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1404 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1405 snd_power_unlock(card);
1406 return res;
1407}
1408
1409#else
1410
1411static int snd_pcm_resume(struct snd_pcm_substream *substream)
1412{
1413 return -ENOSYS;
1414}
1415
1416#endif /* CONFIG_PM */
1417
1418/*
1419 * xrun ioctl
1420 *
1421 * Change the RUNNING stream(s) to XRUN state.
1422 */
1423static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1424{
1425 struct snd_card *card = substream->pcm->card;
1426 struct snd_pcm_runtime *runtime = substream->runtime;
1427 int result;
1428
1429 snd_power_lock(card);
1430 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1431 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1432 if (result < 0)
1433 goto _unlock;
1434 }
1435
1436 snd_pcm_stream_lock_irq(substream);
1437 switch (runtime->status->state) {
1438 case SNDRV_PCM_STATE_XRUN:
1439 result = 0; /* already there */
1440 break;
1441 case SNDRV_PCM_STATE_RUNNING:
1442 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1443 break;
1444 default:
1445 result = -EBADFD;
1446 }
1447 snd_pcm_stream_unlock_irq(substream);
1448 _unlock:
1449 snd_power_unlock(card);
1450 return result;
1451}
1452
1453/*
1454 * reset ioctl
1455 */
1456static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1457{
1458 struct snd_pcm_runtime *runtime = substream->runtime;
1459 switch (runtime->status->state) {
1460 case SNDRV_PCM_STATE_RUNNING:
1461 case SNDRV_PCM_STATE_PREPARED:
1462 case SNDRV_PCM_STATE_PAUSED:
1463 case SNDRV_PCM_STATE_SUSPENDED:
1464 return 0;
1465 default:
1466 return -EBADFD;
1467 }
1468}
1469
1470static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1471{
1472 struct snd_pcm_runtime *runtime = substream->runtime;
1473 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1474 if (err < 0)
1475 return err;
1476 runtime->hw_ptr_base = 0;
1477 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1478 runtime->status->hw_ptr % runtime->period_size;
1479 runtime->silence_start = runtime->status->hw_ptr;
1480 runtime->silence_filled = 0;
1481 return 0;
1482}
1483
1484static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1485{
1486 struct snd_pcm_runtime *runtime = substream->runtime;
1487 runtime->control->appl_ptr = runtime->status->hw_ptr;
1488 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1489 runtime->silence_size > 0)
1490 snd_pcm_playback_silence(substream, ULONG_MAX);
1491}
1492
1493static const struct action_ops snd_pcm_action_reset = {
1494 .pre_action = snd_pcm_pre_reset,
1495 .do_action = snd_pcm_do_reset,
1496 .post_action = snd_pcm_post_reset
1497};
1498
1499static int snd_pcm_reset(struct snd_pcm_substream *substream)
1500{
1501 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1502}
1503
1504/*
1505 * prepare ioctl
1506 */
1507/* we use the second argument for updating f_flags */
1508static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1509 int f_flags)
1510{
1511 struct snd_pcm_runtime *runtime = substream->runtime;
1512 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1513 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1514 return -EBADFD;
1515 if (snd_pcm_running(substream))
1516 return -EBUSY;
1517 substream->f_flags = f_flags;
1518 return 0;
1519}
1520
1521static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1522{
1523 int err;
1524 err = substream->ops->prepare(substream);
1525 if (err < 0)
1526 return err;
1527 return snd_pcm_do_reset(substream, 0);
1528}
1529
1530static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1531{
1532 struct snd_pcm_runtime *runtime = substream->runtime;
1533 runtime->control->appl_ptr = runtime->status->hw_ptr;
1534 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1535}
1536
1537static const struct action_ops snd_pcm_action_prepare = {
1538 .pre_action = snd_pcm_pre_prepare,
1539 .do_action = snd_pcm_do_prepare,
1540 .post_action = snd_pcm_post_prepare
1541};
1542
1543/**
1544 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1545 * @substream: the PCM substream instance
1546 * @file: file to refer f_flags
1547 *
1548 * Return: Zero if successful, or a negative error code.
1549 */
1550static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1551 struct file *file)
1552{
1553 int res;
1554 struct snd_card *card = substream->pcm->card;
1555 int f_flags;
1556
1557 if (file)
1558 f_flags = file->f_flags;
1559 else
1560 f_flags = substream->f_flags;
1561
1562 snd_power_lock(card);
1563 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1564 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1565 substream, f_flags);
1566 snd_power_unlock(card);
1567 return res;
1568}
1569
1570/*
1571 * drain ioctl
1572 */
1573
1574static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1575{
1576 struct snd_pcm_runtime *runtime = substream->runtime;
1577 switch (runtime->status->state) {
1578 case SNDRV_PCM_STATE_OPEN:
1579 case SNDRV_PCM_STATE_DISCONNECTED:
1580 case SNDRV_PCM_STATE_SUSPENDED:
1581 return -EBADFD;
1582 }
1583 runtime->trigger_master = substream;
1584 return 0;
1585}
1586
1587static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1588{
1589 struct snd_pcm_runtime *runtime = substream->runtime;
1590 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1591 switch (runtime->status->state) {
1592 case SNDRV_PCM_STATE_PREPARED:
1593 /* start playback stream if possible */
1594 if (! snd_pcm_playback_empty(substream)) {
1595 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1596 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1597 } else {
1598 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1599 }
1600 break;
1601 case SNDRV_PCM_STATE_RUNNING:
1602 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1603 break;
1604 case SNDRV_PCM_STATE_XRUN:
1605 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1606 break;
1607 default:
1608 break;
1609 }
1610 } else {
1611 /* stop running stream */
1612 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1613 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1614 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1615 snd_pcm_do_stop(substream, new_state);
1616 snd_pcm_post_stop(substream, new_state);
1617 }
1618 }
1619
1620 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1621 runtime->trigger_master == substream &&
1622 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1623 return substream->ops->trigger(substream,
1624 SNDRV_PCM_TRIGGER_DRAIN);
1625
1626 return 0;
1627}
1628
1629static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1630{
1631}
1632
1633static const struct action_ops snd_pcm_action_drain_init = {
1634 .pre_action = snd_pcm_pre_drain_init,
1635 .do_action = snd_pcm_do_drain_init,
1636 .post_action = snd_pcm_post_drain_init
1637};
1638
1639static int snd_pcm_drop(struct snd_pcm_substream *substream);
1640
1641/*
1642 * Drain the stream(s).
1643 * When the substream is linked, sync until the draining of all playback streams
1644 * is finished.
1645 * After this call, all streams are supposed to be either SETUP or DRAINING
1646 * (capture only) state.
1647 */
1648static int snd_pcm_drain(struct snd_pcm_substream *substream,
1649 struct file *file)
1650{
1651 struct snd_card *card;
1652 struct snd_pcm_runtime *runtime;
1653 struct snd_pcm_substream *s;
1654 wait_queue_t wait;
1655 int result = 0;
1656 int nonblock = 0;
1657
1658 card = substream->pcm->card;
1659 runtime = substream->runtime;
1660
1661 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1662 return -EBADFD;
1663
1664 snd_power_lock(card);
1665 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1666 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1667 if (result < 0) {
1668 snd_power_unlock(card);
1669 return result;
1670 }
1671 }
1672
1673 if (file) {
1674 if (file->f_flags & O_NONBLOCK)
1675 nonblock = 1;
1676 } else if (substream->f_flags & O_NONBLOCK)
1677 nonblock = 1;
1678
1679 down_read(&snd_pcm_link_rwsem);
1680 snd_pcm_stream_lock_irq(substream);
1681 /* resume pause */
1682 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1683 snd_pcm_pause(substream, 0);
1684
1685 /* pre-start/stop - all running streams are changed to DRAINING state */
1686 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1687 if (result < 0)
1688 goto unlock;
1689 /* in non-blocking, we don't wait in ioctl but let caller poll */
1690 if (nonblock) {
1691 result = -EAGAIN;
1692 goto unlock;
1693 }
1694
1695 for (;;) {
1696 long tout;
1697 struct snd_pcm_runtime *to_check;
1698 if (signal_pending(current)) {
1699 result = -ERESTARTSYS;
1700 break;
1701 }
1702 /* find a substream to drain */
1703 to_check = NULL;
1704 snd_pcm_group_for_each_entry(s, substream) {
1705 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1706 continue;
1707 runtime = s->runtime;
1708 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1709 to_check = runtime;
1710 break;
1711 }
1712 }
1713 if (!to_check)
1714 break; /* all drained */
1715 init_waitqueue_entry(&wait, current);
1716 add_wait_queue(&to_check->sleep, &wait);
1717 snd_pcm_stream_unlock_irq(substream);
1718 up_read(&snd_pcm_link_rwsem);
1719 snd_power_unlock(card);
1720 if (runtime->no_period_wakeup)
1721 tout = MAX_SCHEDULE_TIMEOUT;
1722 else {
1723 tout = 10;
1724 if (runtime->rate) {
1725 long t = runtime->period_size * 2 / runtime->rate;
1726 tout = max(t, tout);
1727 }
1728 tout = msecs_to_jiffies(tout * 1000);
1729 }
1730 tout = schedule_timeout_interruptible(tout);
1731 snd_power_lock(card);
1732 down_read(&snd_pcm_link_rwsem);
1733 snd_pcm_stream_lock_irq(substream);
1734 remove_wait_queue(&to_check->sleep, &wait);
1735 if (card->shutdown) {
1736 result = -ENODEV;
1737 break;
1738 }
1739 if (tout == 0) {
1740 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1741 result = -ESTRPIPE;
1742 else {
1743 dev_dbg(substream->pcm->card->dev,
1744 "playback drain error (DMA or IRQ trouble?)\n");
1745 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1746 result = -EIO;
1747 }
1748 break;
1749 }
1750 }
1751
1752 unlock:
1753 snd_pcm_stream_unlock_irq(substream);
1754 up_read(&snd_pcm_link_rwsem);
1755 snd_power_unlock(card);
1756
1757 return result;
1758}
1759
1760/*
1761 * drop ioctl
1762 *
1763 * Immediately put all linked substreams into SETUP state.
1764 */
1765static int snd_pcm_drop(struct snd_pcm_substream *substream)
1766{
1767 struct snd_pcm_runtime *runtime;
1768 int result = 0;
1769
1770 if (PCM_RUNTIME_CHECK(substream))
1771 return -ENXIO;
1772 runtime = substream->runtime;
1773
1774 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1775 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1776 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1777 return -EBADFD;
1778
1779 snd_pcm_stream_lock_irq(substream);
1780 /* resume pause */
1781 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1782 snd_pcm_pause(substream, 0);
1783
1784 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1785 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1786 snd_pcm_stream_unlock_irq(substream);
1787
1788 return result;
1789}
1790
1791
1792static bool is_pcm_file(struct file *file)
1793{
1794 struct inode *inode = file_inode(file);
1795 unsigned int minor;
1796
1797 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1798 return false;
1799 minor = iminor(inode);
1800 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1801 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1802}
1803
1804/*
1805 * PCM link handling
1806 */
1807static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1808{
1809 int res = 0;
1810 struct snd_pcm_file *pcm_file;
1811 struct snd_pcm_substream *substream1;
1812 struct snd_pcm_group *group;
1813 struct fd f = fdget(fd);
1814
1815 if (!f.file)
1816 return -EBADFD;
1817 if (!is_pcm_file(f.file)) {
1818 res = -EBADFD;
1819 goto _badf;
1820 }
1821 pcm_file = f.file->private_data;
1822 substream1 = pcm_file->substream;
1823 group = kmalloc(sizeof(*group), GFP_KERNEL);
1824 if (!group) {
1825 res = -ENOMEM;
1826 goto _nolock;
1827 }
1828 down_write_nonblock(&snd_pcm_link_rwsem);
1829 write_lock_irq(&snd_pcm_link_rwlock);
1830 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1831 substream->runtime->status->state != substream1->runtime->status->state ||
1832 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1833 res = -EBADFD;
1834 goto _end;
1835 }
1836 if (snd_pcm_stream_linked(substream1)) {
1837 res = -EALREADY;
1838 goto _end;
1839 }
1840 if (!snd_pcm_stream_linked(substream)) {
1841 substream->group = group;
1842 group = NULL;
1843 spin_lock_init(&substream->group->lock);
1844 mutex_init(&substream->group->mutex);
1845 INIT_LIST_HEAD(&substream->group->substreams);
1846 list_add_tail(&substream->link_list, &substream->group->substreams);
1847 substream->group->count = 1;
1848 }
1849 list_add_tail(&substream1->link_list, &substream->group->substreams);
1850 substream->group->count++;
1851 substream1->group = substream->group;
1852 _end:
1853 write_unlock_irq(&snd_pcm_link_rwlock);
1854 up_write(&snd_pcm_link_rwsem);
1855 _nolock:
1856 snd_card_unref(substream1->pcm->card);
1857 kfree(group);
1858 _badf:
1859 fdput(f);
1860 return res;
1861}
1862
1863static void relink_to_local(struct snd_pcm_substream *substream)
1864{
1865 substream->group = &substream->self_group;
1866 INIT_LIST_HEAD(&substream->self_group.substreams);
1867 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1868}
1869
1870static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1871{
1872 struct snd_pcm_substream *s;
1873 int res = 0;
1874
1875 down_write_nonblock(&snd_pcm_link_rwsem);
1876 write_lock_irq(&snd_pcm_link_rwlock);
1877 if (!snd_pcm_stream_linked(substream)) {
1878 res = -EALREADY;
1879 goto _end;
1880 }
1881 list_del(&substream->link_list);
1882 substream->group->count--;
1883 if (substream->group->count == 1) { /* detach the last stream, too */
1884 snd_pcm_group_for_each_entry(s, substream) {
1885 relink_to_local(s);
1886 break;
1887 }
1888 kfree(substream->group);
1889 }
1890 relink_to_local(substream);
1891 _end:
1892 write_unlock_irq(&snd_pcm_link_rwlock);
1893 up_write(&snd_pcm_link_rwsem);
1894 return res;
1895}
1896
1897/*
1898 * hw configurator
1899 */
1900static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1901 struct snd_pcm_hw_rule *rule)
1902{
1903 struct snd_interval t;
1904 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1905 hw_param_interval_c(params, rule->deps[1]), &t);
1906 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1907}
1908
1909static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1910 struct snd_pcm_hw_rule *rule)
1911{
1912 struct snd_interval t;
1913 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1914 hw_param_interval_c(params, rule->deps[1]), &t);
1915 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1916}
1917
1918static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1919 struct snd_pcm_hw_rule *rule)
1920{
1921 struct snd_interval t;
1922 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1923 hw_param_interval_c(params, rule->deps[1]),
1924 (unsigned long) rule->private, &t);
1925 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1926}
1927
1928static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1929 struct snd_pcm_hw_rule *rule)
1930{
1931 struct snd_interval t;
1932 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1933 (unsigned long) rule->private,
1934 hw_param_interval_c(params, rule->deps[1]), &t);
1935 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1936}
1937
1938static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1939 struct snd_pcm_hw_rule *rule)
1940{
1941 unsigned int k;
1942 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1943 struct snd_mask m;
1944 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1945 snd_mask_any(&m);
1946 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1947 int bits;
1948 if (! snd_mask_test(mask, k))
1949 continue;
1950 bits = snd_pcm_format_physical_width(k);
1951 if (bits <= 0)
1952 continue; /* ignore invalid formats */
1953 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1954 snd_mask_reset(&m, k);
1955 }
1956 return snd_mask_refine(mask, &m);
1957}
1958
1959static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1960 struct snd_pcm_hw_rule *rule)
1961{
1962 struct snd_interval t;
1963 unsigned int k;
1964 t.min = UINT_MAX;
1965 t.max = 0;
1966 t.openmin = 0;
1967 t.openmax = 0;
1968 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1969 int bits;
1970 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1971 continue;
1972 bits = snd_pcm_format_physical_width(k);
1973 if (bits <= 0)
1974 continue; /* ignore invalid formats */
1975 if (t.min > (unsigned)bits)
1976 t.min = bits;
1977 if (t.max < (unsigned)bits)
1978 t.max = bits;
1979 }
1980 t.integer = 1;
1981 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1982}
1983
1984#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1985#error "Change this table"
1986#endif
1987
1988static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1989 48000, 64000, 88200, 96000, 176400, 192000 };
1990
1991const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1992 .count = ARRAY_SIZE(rates),
1993 .list = rates,
1994};
1995
1996static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1997 struct snd_pcm_hw_rule *rule)
1998{
1999 struct snd_pcm_hardware *hw = rule->private;
2000 return snd_interval_list(hw_param_interval(params, rule->var),
2001 snd_pcm_known_rates.count,
2002 snd_pcm_known_rates.list, hw->rates);
2003}
2004
2005static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2006 struct snd_pcm_hw_rule *rule)
2007{
2008 struct snd_interval t;
2009 struct snd_pcm_substream *substream = rule->private;
2010 t.min = 0;
2011 t.max = substream->buffer_bytes_max;
2012 t.openmin = 0;
2013 t.openmax = 0;
2014 t.integer = 1;
2015 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2016}
2017
2018int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2019{
2020 struct snd_pcm_runtime *runtime = substream->runtime;
2021 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2022 int k, err;
2023
2024 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2025 snd_mask_any(constrs_mask(constrs, k));
2026 }
2027
2028 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2029 snd_interval_any(constrs_interval(constrs, k));
2030 }
2031
2032 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2033 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2034 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2035 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2036 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2037
2038 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2039 snd_pcm_hw_rule_format, NULL,
2040 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2041 if (err < 0)
2042 return err;
2043 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2044 snd_pcm_hw_rule_sample_bits, NULL,
2045 SNDRV_PCM_HW_PARAM_FORMAT,
2046 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2047 if (err < 0)
2048 return err;
2049 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2050 snd_pcm_hw_rule_div, NULL,
2051 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2052 if (err < 0)
2053 return err;
2054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2055 snd_pcm_hw_rule_mul, NULL,
2056 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2057 if (err < 0)
2058 return err;
2059 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2060 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2061 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2062 if (err < 0)
2063 return err;
2064 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2065 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2066 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2067 if (err < 0)
2068 return err;
2069 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2070 snd_pcm_hw_rule_div, NULL,
2071 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2072 if (err < 0)
2073 return err;
2074 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2075 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2076 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2077 if (err < 0)
2078 return err;
2079 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2080 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2081 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2082 if (err < 0)
2083 return err;
2084 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2085 snd_pcm_hw_rule_div, NULL,
2086 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2087 if (err < 0)
2088 return err;
2089 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2090 snd_pcm_hw_rule_div, NULL,
2091 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2092 if (err < 0)
2093 return err;
2094 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2095 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2096 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2097 if (err < 0)
2098 return err;
2099 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2100 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2101 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2102 if (err < 0)
2103 return err;
2104 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2105 snd_pcm_hw_rule_mul, NULL,
2106 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2107 if (err < 0)
2108 return err;
2109 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2110 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2111 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2112 if (err < 0)
2113 return err;
2114 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2115 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2116 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2117 if (err < 0)
2118 return err;
2119 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2120 snd_pcm_hw_rule_muldivk, (void*) 8,
2121 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2122 if (err < 0)
2123 return err;
2124 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2125 snd_pcm_hw_rule_muldivk, (void*) 8,
2126 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2127 if (err < 0)
2128 return err;
2129 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2130 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2131 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2132 if (err < 0)
2133 return err;
2134 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2135 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2136 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2137 if (err < 0)
2138 return err;
2139 return 0;
2140}
2141
2142int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2143{
2144 struct snd_pcm_runtime *runtime = substream->runtime;
2145 struct snd_pcm_hardware *hw = &runtime->hw;
2146 int err;
2147 unsigned int mask = 0;
2148
2149 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2150 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2151 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2152 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2153 if (hw_support_mmap(substream)) {
2154 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2155 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2156 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2157 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2158 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2159 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2160 }
2161 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2162 if (err < 0)
2163 return err;
2164
2165 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2166 if (err < 0)
2167 return err;
2168
2169 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2170 if (err < 0)
2171 return err;
2172
2173 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2174 hw->channels_min, hw->channels_max);
2175 if (err < 0)
2176 return err;
2177
2178 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2179 hw->rate_min, hw->rate_max);
2180 if (err < 0)
2181 return err;
2182
2183 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2184 hw->period_bytes_min, hw->period_bytes_max);
2185 if (err < 0)
2186 return err;
2187
2188 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2189 hw->periods_min, hw->periods_max);
2190 if (err < 0)
2191 return err;
2192
2193 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2194 hw->period_bytes_min, hw->buffer_bytes_max);
2195 if (err < 0)
2196 return err;
2197
2198 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2199 snd_pcm_hw_rule_buffer_bytes_max, substream,
2200 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2201 if (err < 0)
2202 return err;
2203
2204 /* FIXME: remove */
2205 if (runtime->dma_bytes) {
2206 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2207 if (err < 0)
2208 return err;
2209 }
2210
2211 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2212 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2213 snd_pcm_hw_rule_rate, hw,
2214 SNDRV_PCM_HW_PARAM_RATE, -1);
2215 if (err < 0)
2216 return err;
2217 }
2218
2219 /* FIXME: this belong to lowlevel */
2220 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2221
2222 return 0;
2223}
2224
2225static void pcm_release_private(struct snd_pcm_substream *substream)
2226{
2227 snd_pcm_unlink(substream);
2228}
2229
2230void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2231{
2232 substream->ref_count--;
2233 if (substream->ref_count > 0)
2234 return;
2235
2236 snd_pcm_drop(substream);
2237 if (substream->hw_opened) {
2238 if (substream->ops->hw_free &&
2239 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2240 substream->ops->hw_free(substream);
2241 substream->ops->close(substream);
2242 substream->hw_opened = 0;
2243 }
2244 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2245 pm_qos_remove_request(&substream->latency_pm_qos_req);
2246 if (substream->pcm_release) {
2247 substream->pcm_release(substream);
2248 substream->pcm_release = NULL;
2249 }
2250 snd_pcm_detach_substream(substream);
2251}
2252
2253EXPORT_SYMBOL(snd_pcm_release_substream);
2254
2255int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2256 struct file *file,
2257 struct snd_pcm_substream **rsubstream)
2258{
2259 struct snd_pcm_substream *substream;
2260 int err;
2261
2262 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2263 if (err < 0)
2264 return err;
2265 if (substream->ref_count > 1) {
2266 *rsubstream = substream;
2267 return 0;
2268 }
2269
2270 err = snd_pcm_hw_constraints_init(substream);
2271 if (err < 0) {
2272 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2273 goto error;
2274 }
2275
2276 if ((err = substream->ops->open(substream)) < 0)
2277 goto error;
2278
2279 substream->hw_opened = 1;
2280
2281 err = snd_pcm_hw_constraints_complete(substream);
2282 if (err < 0) {
2283 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2284 goto error;
2285 }
2286
2287 *rsubstream = substream;
2288 return 0;
2289
2290 error:
2291 snd_pcm_release_substream(substream);
2292 return err;
2293}
2294
2295EXPORT_SYMBOL(snd_pcm_open_substream);
2296
2297static int snd_pcm_open_file(struct file *file,
2298 struct snd_pcm *pcm,
2299 int stream)
2300{
2301 struct snd_pcm_file *pcm_file;
2302 struct snd_pcm_substream *substream;
2303 int err;
2304
2305 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2306 if (err < 0)
2307 return err;
2308
2309 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2310 if (pcm_file == NULL) {
2311 snd_pcm_release_substream(substream);
2312 return -ENOMEM;
2313 }
2314 pcm_file->substream = substream;
2315 if (substream->ref_count == 1) {
2316 substream->file = pcm_file;
2317 substream->pcm_release = pcm_release_private;
2318 }
2319 file->private_data = pcm_file;
2320
2321 return 0;
2322}
2323
2324static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2325{
2326 struct snd_pcm *pcm;
2327 int err = nonseekable_open(inode, file);
2328 if (err < 0)
2329 return err;
2330 pcm = snd_lookup_minor_data(iminor(inode),
2331 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2332 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2333 if (pcm)
2334 snd_card_unref(pcm->card);
2335 return err;
2336}
2337
2338static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2339{
2340 struct snd_pcm *pcm;
2341 int err = nonseekable_open(inode, file);
2342 if (err < 0)
2343 return err;
2344 pcm = snd_lookup_minor_data(iminor(inode),
2345 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2346 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2347 if (pcm)
2348 snd_card_unref(pcm->card);
2349 return err;
2350}
2351
2352static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2353{
2354 int err;
2355 wait_queue_t wait;
2356
2357 if (pcm == NULL) {
2358 err = -ENODEV;
2359 goto __error1;
2360 }
2361 err = snd_card_file_add(pcm->card, file);
2362 if (err < 0)
2363 goto __error1;
2364 if (!try_module_get(pcm->card->module)) {
2365 err = -EFAULT;
2366 goto __error2;
2367 }
2368 init_waitqueue_entry(&wait, current);
2369 add_wait_queue(&pcm->open_wait, &wait);
2370 mutex_lock(&pcm->open_mutex);
2371 while (1) {
2372 err = snd_pcm_open_file(file, pcm, stream);
2373 if (err >= 0)
2374 break;
2375 if (err == -EAGAIN) {
2376 if (file->f_flags & O_NONBLOCK) {
2377 err = -EBUSY;
2378 break;
2379 }
2380 } else
2381 break;
2382 set_current_state(TASK_INTERRUPTIBLE);
2383 mutex_unlock(&pcm->open_mutex);
2384 schedule();
2385 mutex_lock(&pcm->open_mutex);
2386 if (pcm->card->shutdown) {
2387 err = -ENODEV;
2388 break;
2389 }
2390 if (signal_pending(current)) {
2391 err = -ERESTARTSYS;
2392 break;
2393 }
2394 }
2395 remove_wait_queue(&pcm->open_wait, &wait);
2396 mutex_unlock(&pcm->open_mutex);
2397 if (err < 0)
2398 goto __error;
2399 return err;
2400
2401 __error:
2402 module_put(pcm->card->module);
2403 __error2:
2404 snd_card_file_remove(pcm->card, file);
2405 __error1:
2406 return err;
2407}
2408
2409static int snd_pcm_release(struct inode *inode, struct file *file)
2410{
2411 struct snd_pcm *pcm;
2412 struct snd_pcm_substream *substream;
2413 struct snd_pcm_file *pcm_file;
2414
2415 pcm_file = file->private_data;
2416 substream = pcm_file->substream;
2417 if (snd_BUG_ON(!substream))
2418 return -ENXIO;
2419 pcm = substream->pcm;
2420 mutex_lock(&pcm->open_mutex);
2421 snd_pcm_release_substream(substream);
2422 kfree(pcm_file);
2423 mutex_unlock(&pcm->open_mutex);
2424 wake_up(&pcm->open_wait);
2425 module_put(pcm->card->module);
2426 snd_card_file_remove(pcm->card, file);
2427 return 0;
2428}
2429
2430static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2431 snd_pcm_uframes_t frames)
2432{
2433 struct snd_pcm_runtime *runtime = substream->runtime;
2434 snd_pcm_sframes_t appl_ptr;
2435 snd_pcm_sframes_t ret;
2436 snd_pcm_sframes_t hw_avail;
2437
2438 if (frames == 0)
2439 return 0;
2440
2441 snd_pcm_stream_lock_irq(substream);
2442 switch (runtime->status->state) {
2443 case SNDRV_PCM_STATE_PREPARED:
2444 break;
2445 case SNDRV_PCM_STATE_DRAINING:
2446 case SNDRV_PCM_STATE_RUNNING:
2447 if (snd_pcm_update_hw_ptr(substream) >= 0)
2448 break;
2449 /* Fall through */
2450 case SNDRV_PCM_STATE_XRUN:
2451 ret = -EPIPE;
2452 goto __end;
2453 case SNDRV_PCM_STATE_SUSPENDED:
2454 ret = -ESTRPIPE;
2455 goto __end;
2456 default:
2457 ret = -EBADFD;
2458 goto __end;
2459 }
2460
2461 hw_avail = snd_pcm_playback_hw_avail(runtime);
2462 if (hw_avail <= 0) {
2463 ret = 0;
2464 goto __end;
2465 }
2466 if (frames > (snd_pcm_uframes_t)hw_avail)
2467 frames = hw_avail;
2468 appl_ptr = runtime->control->appl_ptr - frames;
2469 if (appl_ptr < 0)
2470 appl_ptr += runtime->boundary;
2471 runtime->control->appl_ptr = appl_ptr;
2472 ret = frames;
2473 __end:
2474 snd_pcm_stream_unlock_irq(substream);
2475 return ret;
2476}
2477
2478static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2479 snd_pcm_uframes_t frames)
2480{
2481 struct snd_pcm_runtime *runtime = substream->runtime;
2482 snd_pcm_sframes_t appl_ptr;
2483 snd_pcm_sframes_t ret;
2484 snd_pcm_sframes_t hw_avail;
2485
2486 if (frames == 0)
2487 return 0;
2488
2489 snd_pcm_stream_lock_irq(substream);
2490 switch (runtime->status->state) {
2491 case SNDRV_PCM_STATE_PREPARED:
2492 case SNDRV_PCM_STATE_DRAINING:
2493 break;
2494 case SNDRV_PCM_STATE_RUNNING:
2495 if (snd_pcm_update_hw_ptr(substream) >= 0)
2496 break;
2497 /* Fall through */
2498 case SNDRV_PCM_STATE_XRUN:
2499 ret = -EPIPE;
2500 goto __end;
2501 case SNDRV_PCM_STATE_SUSPENDED:
2502 ret = -ESTRPIPE;
2503 goto __end;
2504 default:
2505 ret = -EBADFD;
2506 goto __end;
2507 }
2508
2509 hw_avail = snd_pcm_capture_hw_avail(runtime);
2510 if (hw_avail <= 0) {
2511 ret = 0;
2512 goto __end;
2513 }
2514 if (frames > (snd_pcm_uframes_t)hw_avail)
2515 frames = hw_avail;
2516 appl_ptr = runtime->control->appl_ptr - frames;
2517 if (appl_ptr < 0)
2518 appl_ptr += runtime->boundary;
2519 runtime->control->appl_ptr = appl_ptr;
2520 ret = frames;
2521 __end:
2522 snd_pcm_stream_unlock_irq(substream);
2523 return ret;
2524}
2525
2526static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2527 snd_pcm_uframes_t frames)
2528{
2529 struct snd_pcm_runtime *runtime = substream->runtime;
2530 snd_pcm_sframes_t appl_ptr;
2531 snd_pcm_sframes_t ret;
2532 snd_pcm_sframes_t avail;
2533
2534 if (frames == 0)
2535 return 0;
2536
2537 snd_pcm_stream_lock_irq(substream);
2538 switch (runtime->status->state) {
2539 case SNDRV_PCM_STATE_PREPARED:
2540 case SNDRV_PCM_STATE_PAUSED:
2541 break;
2542 case SNDRV_PCM_STATE_DRAINING:
2543 case SNDRV_PCM_STATE_RUNNING:
2544 if (snd_pcm_update_hw_ptr(substream) >= 0)
2545 break;
2546 /* Fall through */
2547 case SNDRV_PCM_STATE_XRUN:
2548 ret = -EPIPE;
2549 goto __end;
2550 case SNDRV_PCM_STATE_SUSPENDED:
2551 ret = -ESTRPIPE;
2552 goto __end;
2553 default:
2554 ret = -EBADFD;
2555 goto __end;
2556 }
2557
2558 avail = snd_pcm_playback_avail(runtime);
2559 if (avail <= 0) {
2560 ret = 0;
2561 goto __end;
2562 }
2563 if (frames > (snd_pcm_uframes_t)avail)
2564 frames = avail;
2565 appl_ptr = runtime->control->appl_ptr + frames;
2566 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2567 appl_ptr -= runtime->boundary;
2568 runtime->control->appl_ptr = appl_ptr;
2569 ret = frames;
2570 __end:
2571 snd_pcm_stream_unlock_irq(substream);
2572 return ret;
2573}
2574
2575static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2576 snd_pcm_uframes_t frames)
2577{
2578 struct snd_pcm_runtime *runtime = substream->runtime;
2579 snd_pcm_sframes_t appl_ptr;
2580 snd_pcm_sframes_t ret;
2581 snd_pcm_sframes_t avail;
2582
2583 if (frames == 0)
2584 return 0;
2585
2586 snd_pcm_stream_lock_irq(substream);
2587 switch (runtime->status->state) {
2588 case SNDRV_PCM_STATE_PREPARED:
2589 case SNDRV_PCM_STATE_DRAINING:
2590 case SNDRV_PCM_STATE_PAUSED:
2591 break;
2592 case SNDRV_PCM_STATE_RUNNING:
2593 if (snd_pcm_update_hw_ptr(substream) >= 0)
2594 break;
2595 /* Fall through */
2596 case SNDRV_PCM_STATE_XRUN:
2597 ret = -EPIPE;
2598 goto __end;
2599 case SNDRV_PCM_STATE_SUSPENDED:
2600 ret = -ESTRPIPE;
2601 goto __end;
2602 default:
2603 ret = -EBADFD;
2604 goto __end;
2605 }
2606
2607 avail = snd_pcm_capture_avail(runtime);
2608 if (avail <= 0) {
2609 ret = 0;
2610 goto __end;
2611 }
2612 if (frames > (snd_pcm_uframes_t)avail)
2613 frames = avail;
2614 appl_ptr = runtime->control->appl_ptr + frames;
2615 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2616 appl_ptr -= runtime->boundary;
2617 runtime->control->appl_ptr = appl_ptr;
2618 ret = frames;
2619 __end:
2620 snd_pcm_stream_unlock_irq(substream);
2621 return ret;
2622}
2623
2624static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2625{
2626 struct snd_pcm_runtime *runtime = substream->runtime;
2627 int err;
2628
2629 snd_pcm_stream_lock_irq(substream);
2630 switch (runtime->status->state) {
2631 case SNDRV_PCM_STATE_DRAINING:
2632 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2633 goto __badfd;
2634 /* Fall through */
2635 case SNDRV_PCM_STATE_RUNNING:
2636 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2637 break;
2638 /* Fall through */
2639 case SNDRV_PCM_STATE_PREPARED:
2640 case SNDRV_PCM_STATE_SUSPENDED:
2641 err = 0;
2642 break;
2643 case SNDRV_PCM_STATE_XRUN:
2644 err = -EPIPE;
2645 break;
2646 default:
2647 __badfd:
2648 err = -EBADFD;
2649 break;
2650 }
2651 snd_pcm_stream_unlock_irq(substream);
2652 return err;
2653}
2654
2655static int snd_pcm_delay(struct snd_pcm_substream *substream,
2656 snd_pcm_sframes_t __user *res)
2657{
2658 struct snd_pcm_runtime *runtime = substream->runtime;
2659 int err;
2660 snd_pcm_sframes_t n = 0;
2661
2662 snd_pcm_stream_lock_irq(substream);
2663 switch (runtime->status->state) {
2664 case SNDRV_PCM_STATE_DRAINING:
2665 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2666 goto __badfd;
2667 /* Fall through */
2668 case SNDRV_PCM_STATE_RUNNING:
2669 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2670 break;
2671 /* Fall through */
2672 case SNDRV_PCM_STATE_PREPARED:
2673 case SNDRV_PCM_STATE_SUSPENDED:
2674 err = 0;
2675 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2676 n = snd_pcm_playback_hw_avail(runtime);
2677 else
2678 n = snd_pcm_capture_avail(runtime);
2679 n += runtime->delay;
2680 break;
2681 case SNDRV_PCM_STATE_XRUN:
2682 err = -EPIPE;
2683 break;
2684 default:
2685 __badfd:
2686 err = -EBADFD;
2687 break;
2688 }
2689 snd_pcm_stream_unlock_irq(substream);
2690 if (!err)
2691 if (put_user(n, res))
2692 err = -EFAULT;
2693 return err;
2694}
2695
2696static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2697 struct snd_pcm_sync_ptr __user *_sync_ptr)
2698{
2699 struct snd_pcm_runtime *runtime = substream->runtime;
2700 struct snd_pcm_sync_ptr sync_ptr;
2701 volatile struct snd_pcm_mmap_status *status;
2702 volatile struct snd_pcm_mmap_control *control;
2703 int err;
2704
2705 memset(&sync_ptr, 0, sizeof(sync_ptr));
2706 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2707 return -EFAULT;
2708 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2709 return -EFAULT;
2710 status = runtime->status;
2711 control = runtime->control;
2712 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2713 err = snd_pcm_hwsync(substream);
2714 if (err < 0)
2715 return err;
2716 }
2717 snd_pcm_stream_lock_irq(substream);
2718 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2719 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2720 else
2721 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2722 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2723 control->avail_min = sync_ptr.c.control.avail_min;
2724 else
2725 sync_ptr.c.control.avail_min = control->avail_min;
2726 sync_ptr.s.status.state = status->state;
2727 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2728 sync_ptr.s.status.tstamp = status->tstamp;
2729 sync_ptr.s.status.suspended_state = status->suspended_state;
2730 snd_pcm_stream_unlock_irq(substream);
2731 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2732 return -EFAULT;
2733 return 0;
2734}
2735
2736static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2737{
2738 struct snd_pcm_runtime *runtime = substream->runtime;
2739 int arg;
2740
2741 if (get_user(arg, _arg))
2742 return -EFAULT;
2743 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2744 return -EINVAL;
2745 runtime->tstamp_type = arg;
2746 return 0;
2747}
2748
2749static int snd_pcm_common_ioctl1(struct file *file,
2750 struct snd_pcm_substream *substream,
2751 unsigned int cmd, void __user *arg)
2752{
2753 switch (cmd) {
2754 case SNDRV_PCM_IOCTL_PVERSION:
2755 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2756 case SNDRV_PCM_IOCTL_INFO:
2757 return snd_pcm_info_user(substream, arg);
2758 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2759 return 0;
2760 case SNDRV_PCM_IOCTL_TTSTAMP:
2761 return snd_pcm_tstamp(substream, arg);
2762 case SNDRV_PCM_IOCTL_HW_REFINE:
2763 return snd_pcm_hw_refine_user(substream, arg);
2764 case SNDRV_PCM_IOCTL_HW_PARAMS:
2765 return snd_pcm_hw_params_user(substream, arg);
2766 case SNDRV_PCM_IOCTL_HW_FREE:
2767 return snd_pcm_hw_free(substream);
2768 case SNDRV_PCM_IOCTL_SW_PARAMS:
2769 return snd_pcm_sw_params_user(substream, arg);
2770 case SNDRV_PCM_IOCTL_STATUS:
2771 return snd_pcm_status_user(substream, arg, false);
2772 case SNDRV_PCM_IOCTL_STATUS_EXT:
2773 return snd_pcm_status_user(substream, arg, true);
2774 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2775 return snd_pcm_channel_info_user(substream, arg);
2776 case SNDRV_PCM_IOCTL_PREPARE:
2777 return snd_pcm_prepare(substream, file);
2778 case SNDRV_PCM_IOCTL_RESET:
2779 return snd_pcm_reset(substream);
2780 case SNDRV_PCM_IOCTL_START:
2781 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2782 case SNDRV_PCM_IOCTL_LINK:
2783 return snd_pcm_link(substream, (int)(unsigned long) arg);
2784 case SNDRV_PCM_IOCTL_UNLINK:
2785 return snd_pcm_unlink(substream);
2786 case SNDRV_PCM_IOCTL_RESUME:
2787 return snd_pcm_resume(substream);
2788 case SNDRV_PCM_IOCTL_XRUN:
2789 return snd_pcm_xrun(substream);
2790 case SNDRV_PCM_IOCTL_HWSYNC:
2791 return snd_pcm_hwsync(substream);
2792 case SNDRV_PCM_IOCTL_DELAY:
2793 return snd_pcm_delay(substream, arg);
2794 case SNDRV_PCM_IOCTL_SYNC_PTR:
2795 return snd_pcm_sync_ptr(substream, arg);
2796#ifdef CONFIG_SND_SUPPORT_OLD_API
2797 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2798 return snd_pcm_hw_refine_old_user(substream, arg);
2799 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2800 return snd_pcm_hw_params_old_user(substream, arg);
2801#endif
2802 case SNDRV_PCM_IOCTL_DRAIN:
2803 return snd_pcm_drain(substream, file);
2804 case SNDRV_PCM_IOCTL_DROP:
2805 return snd_pcm_drop(substream);
2806 case SNDRV_PCM_IOCTL_PAUSE:
2807 {
2808 int res;
2809 snd_pcm_stream_lock_irq(substream);
2810 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2811 snd_pcm_stream_unlock_irq(substream);
2812 return res;
2813 }
2814 }
2815 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2816 return -ENOTTY;
2817}
2818
2819static int snd_pcm_playback_ioctl1(struct file *file,
2820 struct snd_pcm_substream *substream,
2821 unsigned int cmd, void __user *arg)
2822{
2823 if (snd_BUG_ON(!substream))
2824 return -ENXIO;
2825 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2826 return -EINVAL;
2827 switch (cmd) {
2828 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2829 {
2830 struct snd_xferi xferi;
2831 struct snd_xferi __user *_xferi = arg;
2832 struct snd_pcm_runtime *runtime = substream->runtime;
2833 snd_pcm_sframes_t result;
2834 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2835 return -EBADFD;
2836 if (put_user(0, &_xferi->result))
2837 return -EFAULT;
2838 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2839 return -EFAULT;
2840 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2841 __put_user(result, &_xferi->result);
2842 return result < 0 ? result : 0;
2843 }
2844 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2845 {
2846 struct snd_xfern xfern;
2847 struct snd_xfern __user *_xfern = arg;
2848 struct snd_pcm_runtime *runtime = substream->runtime;
2849 void __user **bufs;
2850 snd_pcm_sframes_t result;
2851 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2852 return -EBADFD;
2853 if (runtime->channels > 128)
2854 return -EINVAL;
2855 if (put_user(0, &_xfern->result))
2856 return -EFAULT;
2857 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2858 return -EFAULT;
2859
2860 bufs = memdup_user(xfern.bufs,
2861 sizeof(void *) * runtime->channels);
2862 if (IS_ERR(bufs))
2863 return PTR_ERR(bufs);
2864 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2865 kfree(bufs);
2866 __put_user(result, &_xfern->result);
2867 return result < 0 ? result : 0;
2868 }
2869 case SNDRV_PCM_IOCTL_REWIND:
2870 {
2871 snd_pcm_uframes_t frames;
2872 snd_pcm_uframes_t __user *_frames = arg;
2873 snd_pcm_sframes_t result;
2874 if (get_user(frames, _frames))
2875 return -EFAULT;
2876 if (put_user(0, _frames))
2877 return -EFAULT;
2878 result = snd_pcm_playback_rewind(substream, frames);
2879 __put_user(result, _frames);
2880 return result < 0 ? result : 0;
2881 }
2882 case SNDRV_PCM_IOCTL_FORWARD:
2883 {
2884 snd_pcm_uframes_t frames;
2885 snd_pcm_uframes_t __user *_frames = arg;
2886 snd_pcm_sframes_t result;
2887 if (get_user(frames, _frames))
2888 return -EFAULT;
2889 if (put_user(0, _frames))
2890 return -EFAULT;
2891 result = snd_pcm_playback_forward(substream, frames);
2892 __put_user(result, _frames);
2893 return result < 0 ? result : 0;
2894 }
2895 }
2896 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2897}
2898
2899static int snd_pcm_capture_ioctl1(struct file *file,
2900 struct snd_pcm_substream *substream,
2901 unsigned int cmd, void __user *arg)
2902{
2903 if (snd_BUG_ON(!substream))
2904 return -ENXIO;
2905 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2906 return -EINVAL;
2907 switch (cmd) {
2908 case SNDRV_PCM_IOCTL_READI_FRAMES:
2909 {
2910 struct snd_xferi xferi;
2911 struct snd_xferi __user *_xferi = arg;
2912 struct snd_pcm_runtime *runtime = substream->runtime;
2913 snd_pcm_sframes_t result;
2914 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2915 return -EBADFD;
2916 if (put_user(0, &_xferi->result))
2917 return -EFAULT;
2918 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2919 return -EFAULT;
2920 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2921 __put_user(result, &_xferi->result);
2922 return result < 0 ? result : 0;
2923 }
2924 case SNDRV_PCM_IOCTL_READN_FRAMES:
2925 {
2926 struct snd_xfern xfern;
2927 struct snd_xfern __user *_xfern = arg;
2928 struct snd_pcm_runtime *runtime = substream->runtime;
2929 void *bufs;
2930 snd_pcm_sframes_t result;
2931 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2932 return -EBADFD;
2933 if (runtime->channels > 128)
2934 return -EINVAL;
2935 if (put_user(0, &_xfern->result))
2936 return -EFAULT;
2937 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2938 return -EFAULT;
2939
2940 bufs = memdup_user(xfern.bufs,
2941 sizeof(void *) * runtime->channels);
2942 if (IS_ERR(bufs))
2943 return PTR_ERR(bufs);
2944 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2945 kfree(bufs);
2946 __put_user(result, &_xfern->result);
2947 return result < 0 ? result : 0;
2948 }
2949 case SNDRV_PCM_IOCTL_REWIND:
2950 {
2951 snd_pcm_uframes_t frames;
2952 snd_pcm_uframes_t __user *_frames = arg;
2953 snd_pcm_sframes_t result;
2954 if (get_user(frames, _frames))
2955 return -EFAULT;
2956 if (put_user(0, _frames))
2957 return -EFAULT;
2958 result = snd_pcm_capture_rewind(substream, frames);
2959 __put_user(result, _frames);
2960 return result < 0 ? result : 0;
2961 }
2962 case SNDRV_PCM_IOCTL_FORWARD:
2963 {
2964 snd_pcm_uframes_t frames;
2965 snd_pcm_uframes_t __user *_frames = arg;
2966 snd_pcm_sframes_t result;
2967 if (get_user(frames, _frames))
2968 return -EFAULT;
2969 if (put_user(0, _frames))
2970 return -EFAULT;
2971 result = snd_pcm_capture_forward(substream, frames);
2972 __put_user(result, _frames);
2973 return result < 0 ? result : 0;
2974 }
2975 }
2976 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2977}
2978
2979static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2980 unsigned long arg)
2981{
2982 struct snd_pcm_file *pcm_file;
2983
2984 pcm_file = file->private_data;
2985
2986 if (((cmd >> 8) & 0xff) != 'A')
2987 return -ENOTTY;
2988
2989 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2990 (void __user *)arg);
2991}
2992
2993static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2994 unsigned long arg)
2995{
2996 struct snd_pcm_file *pcm_file;
2997
2998 pcm_file = file->private_data;
2999
3000 if (((cmd >> 8) & 0xff) != 'A')
3001 return -ENOTTY;
3002
3003 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
3004 (void __user *)arg);
3005}
3006
3007int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3008 unsigned int cmd, void *arg)
3009{
3010 mm_segment_t fs;
3011 int result;
3012
3013 fs = snd_enter_user();
3014 switch (substream->stream) {
3015 case SNDRV_PCM_STREAM_PLAYBACK:
3016 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
3017 (void __user *)arg);
3018 break;
3019 case SNDRV_PCM_STREAM_CAPTURE:
3020 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
3021 (void __user *)arg);
3022 break;
3023 default:
3024 result = -EINVAL;
3025 break;
3026 }
3027 snd_leave_user(fs);
3028 return result;
3029}
3030
3031EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3032
3033static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3034 loff_t * offset)
3035{
3036 struct snd_pcm_file *pcm_file;
3037 struct snd_pcm_substream *substream;
3038 struct snd_pcm_runtime *runtime;
3039 snd_pcm_sframes_t result;
3040
3041 pcm_file = file->private_data;
3042 substream = pcm_file->substream;
3043 if (PCM_RUNTIME_CHECK(substream))
3044 return -ENXIO;
3045 runtime = substream->runtime;
3046 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3047 return -EBADFD;
3048 if (!frame_aligned(runtime, count))
3049 return -EINVAL;
3050 count = bytes_to_frames(runtime, count);
3051 result = snd_pcm_lib_read(substream, buf, count);
3052 if (result > 0)
3053 result = frames_to_bytes(runtime, result);
3054 return result;
3055}
3056
3057static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3058 size_t count, loff_t * offset)
3059{
3060 struct snd_pcm_file *pcm_file;
3061 struct snd_pcm_substream *substream;
3062 struct snd_pcm_runtime *runtime;
3063 snd_pcm_sframes_t result;
3064
3065 pcm_file = file->private_data;
3066 substream = pcm_file->substream;
3067 if (PCM_RUNTIME_CHECK(substream))
3068 return -ENXIO;
3069 runtime = substream->runtime;
3070 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3071 return -EBADFD;
3072 if (!frame_aligned(runtime, count))
3073 return -EINVAL;
3074 count = bytes_to_frames(runtime, count);
3075 result = snd_pcm_lib_write(substream, buf, count);
3076 if (result > 0)
3077 result = frames_to_bytes(runtime, result);
3078 return result;
3079}
3080
3081static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3082{
3083 struct snd_pcm_file *pcm_file;
3084 struct snd_pcm_substream *substream;
3085 struct snd_pcm_runtime *runtime;
3086 snd_pcm_sframes_t result;
3087 unsigned long i;
3088 void __user **bufs;
3089 snd_pcm_uframes_t frames;
3090
3091 pcm_file = iocb->ki_filp->private_data;
3092 substream = pcm_file->substream;
3093 if (PCM_RUNTIME_CHECK(substream))
3094 return -ENXIO;
3095 runtime = substream->runtime;
3096 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3097 return -EBADFD;
3098 if (!iter_is_iovec(to))
3099 return -EINVAL;
3100 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3101 return -EINVAL;
3102 if (!frame_aligned(runtime, to->iov->iov_len))
3103 return -EINVAL;
3104 frames = bytes_to_samples(runtime, to->iov->iov_len);
3105 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3106 if (bufs == NULL)
3107 return -ENOMEM;
3108 for (i = 0; i < to->nr_segs; ++i)
3109 bufs[i] = to->iov[i].iov_base;
3110 result = snd_pcm_lib_readv(substream, bufs, frames);
3111 if (result > 0)
3112 result = frames_to_bytes(runtime, result);
3113 kfree(bufs);
3114 return result;
3115}
3116
3117static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3118{
3119 struct snd_pcm_file *pcm_file;
3120 struct snd_pcm_substream *substream;
3121 struct snd_pcm_runtime *runtime;
3122 snd_pcm_sframes_t result;
3123 unsigned long i;
3124 void __user **bufs;
3125 snd_pcm_uframes_t frames;
3126
3127 pcm_file = iocb->ki_filp->private_data;
3128 substream = pcm_file->substream;
3129 if (PCM_RUNTIME_CHECK(substream))
3130 return -ENXIO;
3131 runtime = substream->runtime;
3132 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3133 return -EBADFD;
3134 if (!iter_is_iovec(from))
3135 return -EINVAL;
3136 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3137 !frame_aligned(runtime, from->iov->iov_len))
3138 return -EINVAL;
3139 frames = bytes_to_samples(runtime, from->iov->iov_len);
3140 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3141 if (bufs == NULL)
3142 return -ENOMEM;
3143 for (i = 0; i < from->nr_segs; ++i)
3144 bufs[i] = from->iov[i].iov_base;
3145 result = snd_pcm_lib_writev(substream, bufs, frames);
3146 if (result > 0)
3147 result = frames_to_bytes(runtime, result);
3148 kfree(bufs);
3149 return result;
3150}
3151
3152static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3153{
3154 struct snd_pcm_file *pcm_file;
3155 struct snd_pcm_substream *substream;
3156 struct snd_pcm_runtime *runtime;
3157 unsigned int mask;
3158 snd_pcm_uframes_t avail;
3159
3160 pcm_file = file->private_data;
3161
3162 substream = pcm_file->substream;
3163 if (PCM_RUNTIME_CHECK(substream))
3164 return -ENXIO;
3165 runtime = substream->runtime;
3166
3167 poll_wait(file, &runtime->sleep, wait);
3168
3169 snd_pcm_stream_lock_irq(substream);
3170 avail = snd_pcm_playback_avail(runtime);
3171 switch (runtime->status->state) {
3172 case SNDRV_PCM_STATE_RUNNING:
3173 case SNDRV_PCM_STATE_PREPARED:
3174 case SNDRV_PCM_STATE_PAUSED:
3175 if (avail >= runtime->control->avail_min) {
3176 mask = POLLOUT | POLLWRNORM;
3177 break;
3178 }
3179 /* Fall through */
3180 case SNDRV_PCM_STATE_DRAINING:
3181 mask = 0;
3182 break;
3183 default:
3184 mask = POLLOUT | POLLWRNORM | POLLERR;
3185 break;
3186 }
3187 snd_pcm_stream_unlock_irq(substream);
3188 return mask;
3189}
3190
3191static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3192{
3193 struct snd_pcm_file *pcm_file;
3194 struct snd_pcm_substream *substream;
3195 struct snd_pcm_runtime *runtime;
3196 unsigned int mask;
3197 snd_pcm_uframes_t avail;
3198
3199 pcm_file = file->private_data;
3200
3201 substream = pcm_file->substream;
3202 if (PCM_RUNTIME_CHECK(substream))
3203 return -ENXIO;
3204 runtime = substream->runtime;
3205
3206 poll_wait(file, &runtime->sleep, wait);
3207
3208 snd_pcm_stream_lock_irq(substream);
3209 avail = snd_pcm_capture_avail(runtime);
3210 switch (runtime->status->state) {
3211 case SNDRV_PCM_STATE_RUNNING:
3212 case SNDRV_PCM_STATE_PREPARED:
3213 case SNDRV_PCM_STATE_PAUSED:
3214 if (avail >= runtime->control->avail_min) {
3215 mask = POLLIN | POLLRDNORM;
3216 break;
3217 }
3218 mask = 0;
3219 break;
3220 case SNDRV_PCM_STATE_DRAINING:
3221 if (avail > 0) {
3222 mask = POLLIN | POLLRDNORM;
3223 break;
3224 }
3225 /* Fall through */
3226 default:
3227 mask = POLLIN | POLLRDNORM | POLLERR;
3228 break;
3229 }
3230 snd_pcm_stream_unlock_irq(substream);
3231 return mask;
3232}
3233
3234/*
3235 * mmap support
3236 */
3237
3238/*
3239 * Only on coherent architectures, we can mmap the status and the control records
3240 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3241 */
3242#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3243/*
3244 * mmap status record
3245 */
3246static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3247 struct vm_fault *vmf)
3248{
3249 struct snd_pcm_substream *substream = area->vm_private_data;
3250 struct snd_pcm_runtime *runtime;
3251
3252 if (substream == NULL)
3253 return VM_FAULT_SIGBUS;
3254 runtime = substream->runtime;
3255 vmf->page = virt_to_page(runtime->status);
3256 get_page(vmf->page);
3257 return 0;
3258}
3259
3260static const struct vm_operations_struct snd_pcm_vm_ops_status =
3261{
3262 .fault = snd_pcm_mmap_status_fault,
3263};
3264
3265static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3266 struct vm_area_struct *area)
3267{
3268 long size;
3269 if (!(area->vm_flags & VM_READ))
3270 return -EINVAL;
3271 size = area->vm_end - area->vm_start;
3272 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3273 return -EINVAL;
3274 area->vm_ops = &snd_pcm_vm_ops_status;
3275 area->vm_private_data = substream;
3276 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3277 return 0;
3278}
3279
3280/*
3281 * mmap control record
3282 */
3283static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3284 struct vm_fault *vmf)
3285{
3286 struct snd_pcm_substream *substream = area->vm_private_data;
3287 struct snd_pcm_runtime *runtime;
3288
3289 if (substream == NULL)
3290 return VM_FAULT_SIGBUS;
3291 runtime = substream->runtime;
3292 vmf->page = virt_to_page(runtime->control);
3293 get_page(vmf->page);
3294 return 0;
3295}
3296
3297static const struct vm_operations_struct snd_pcm_vm_ops_control =
3298{
3299 .fault = snd_pcm_mmap_control_fault,
3300};
3301
3302static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3303 struct vm_area_struct *area)
3304{
3305 long size;
3306 if (!(area->vm_flags & VM_READ))
3307 return -EINVAL;
3308 size = area->vm_end - area->vm_start;
3309 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3310 return -EINVAL;
3311 area->vm_ops = &snd_pcm_vm_ops_control;
3312 area->vm_private_data = substream;
3313 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3314 return 0;
3315}
3316#else /* ! coherent mmap */
3317/*
3318 * don't support mmap for status and control records.
3319 */
3320static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3321 struct vm_area_struct *area)
3322{
3323 return -ENXIO;
3324}
3325static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3326 struct vm_area_struct *area)
3327{
3328 return -ENXIO;
3329}
3330#endif /* coherent mmap */
3331
3332static inline struct page *
3333snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3334{
3335 void *vaddr = substream->runtime->dma_area + ofs;
3336 return virt_to_page(vaddr);
3337}
3338
3339/*
3340 * fault callback for mmapping a RAM page
3341 */
3342static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3343 struct vm_fault *vmf)
3344{
3345 struct snd_pcm_substream *substream = area->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 (!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 area->vm_end - area->vm_start);
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}
3440
3441EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3442#endif /* SNDRV_PCM_INFO_MMAP */
3443
3444/*
3445 * mmap DMA buffer
3446 */
3447int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3448 struct vm_area_struct *area)
3449{
3450 struct snd_pcm_runtime *runtime;
3451 long size;
3452 unsigned long offset;
3453 size_t dma_bytes;
3454 int err;
3455
3456 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3457 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3458 return -EINVAL;
3459 } else {
3460 if (!(area->vm_flags & VM_READ))
3461 return -EINVAL;
3462 }
3463 runtime = substream->runtime;
3464 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3465 return -EBADFD;
3466 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3467 return -ENXIO;
3468 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3469 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3470 return -EINVAL;
3471 size = area->vm_end - area->vm_start;
3472 offset = area->vm_pgoff << PAGE_SHIFT;
3473 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3474 if ((size_t)size > dma_bytes)
3475 return -EINVAL;
3476 if (offset > dma_bytes - size)
3477 return -EINVAL;
3478
3479 area->vm_ops = &snd_pcm_vm_ops_data;
3480 area->vm_private_data = substream;
3481 if (substream->ops->mmap)
3482 err = substream->ops->mmap(substream, area);
3483 else
3484 err = snd_pcm_lib_default_mmap(substream, area);
3485 if (!err)
3486 atomic_inc(&substream->mmap_count);
3487 return err;
3488}
3489
3490EXPORT_SYMBOL(snd_pcm_mmap_data);
3491
3492static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3493{
3494 struct snd_pcm_file * pcm_file;
3495 struct snd_pcm_substream *substream;
3496 unsigned long offset;
3497
3498 pcm_file = file->private_data;
3499 substream = pcm_file->substream;
3500 if (PCM_RUNTIME_CHECK(substream))
3501 return -ENXIO;
3502
3503 offset = area->vm_pgoff << PAGE_SHIFT;
3504 switch (offset) {
3505 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3506 if (pcm_file->no_compat_mmap)
3507 return -ENXIO;
3508 return snd_pcm_mmap_status(substream, file, area);
3509 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3510 if (pcm_file->no_compat_mmap)
3511 return -ENXIO;
3512 return snd_pcm_mmap_control(substream, file, area);
3513 default:
3514 return snd_pcm_mmap_data(substream, file, area);
3515 }
3516 return 0;
3517}
3518
3519static int snd_pcm_fasync(int fd, struct file * file, int on)
3520{
3521 struct snd_pcm_file * pcm_file;
3522 struct snd_pcm_substream *substream;
3523 struct snd_pcm_runtime *runtime;
3524
3525 pcm_file = file->private_data;
3526 substream = pcm_file->substream;
3527 if (PCM_RUNTIME_CHECK(substream))
3528 return -ENXIO;
3529 runtime = substream->runtime;
3530 return fasync_helper(fd, file, on, &runtime->fasync);
3531}
3532
3533/*
3534 * ioctl32 compat
3535 */
3536#ifdef CONFIG_COMPAT
3537#include "pcm_compat.c"
3538#else
3539#define snd_pcm_ioctl_compat NULL
3540#endif
3541
3542/*
3543 * To be removed helpers to keep binary compatibility
3544 */
3545
3546#ifdef CONFIG_SND_SUPPORT_OLD_API
3547#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3548#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3549
3550static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3551 struct snd_pcm_hw_params_old *oparams)
3552{
3553 unsigned int i;
3554
3555 memset(params, 0, sizeof(*params));
3556 params->flags = oparams->flags;
3557 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3558 params->masks[i].bits[0] = oparams->masks[i];
3559 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3560 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3561 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3562 params->info = oparams->info;
3563 params->msbits = oparams->msbits;
3564 params->rate_num = oparams->rate_num;
3565 params->rate_den = oparams->rate_den;
3566 params->fifo_size = oparams->fifo_size;
3567}
3568
3569static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3570 struct snd_pcm_hw_params *params)
3571{
3572 unsigned int i;
3573
3574 memset(oparams, 0, sizeof(*oparams));
3575 oparams->flags = params->flags;
3576 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3577 oparams->masks[i] = params->masks[i].bits[0];
3578 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3579 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3580 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3581 oparams->info = params->info;
3582 oparams->msbits = params->msbits;
3583 oparams->rate_num = params->rate_num;
3584 oparams->rate_den = params->rate_den;
3585 oparams->fifo_size = params->fifo_size;
3586}
3587
3588static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3589 struct snd_pcm_hw_params_old __user * _oparams)
3590{
3591 struct snd_pcm_hw_params *params;
3592 struct snd_pcm_hw_params_old *oparams = NULL;
3593 int err;
3594
3595 params = kmalloc(sizeof(*params), GFP_KERNEL);
3596 if (!params)
3597 return -ENOMEM;
3598
3599 oparams = memdup_user(_oparams, sizeof(*oparams));
3600 if (IS_ERR(oparams)) {
3601 err = PTR_ERR(oparams);
3602 goto out;
3603 }
3604 snd_pcm_hw_convert_from_old_params(params, oparams);
3605 err = snd_pcm_hw_refine(substream, params);
3606 snd_pcm_hw_convert_to_old_params(oparams, params);
3607 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3608 if (!err)
3609 err = -EFAULT;
3610 }
3611
3612 kfree(oparams);
3613out:
3614 kfree(params);
3615 return err;
3616}
3617
3618static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3619 struct snd_pcm_hw_params_old __user * _oparams)
3620{
3621 struct snd_pcm_hw_params *params;
3622 struct snd_pcm_hw_params_old *oparams = NULL;
3623 int err;
3624
3625 params = kmalloc(sizeof(*params), GFP_KERNEL);
3626 if (!params)
3627 return -ENOMEM;
3628
3629 oparams = memdup_user(_oparams, sizeof(*oparams));
3630 if (IS_ERR(oparams)) {
3631 err = PTR_ERR(oparams);
3632 goto out;
3633 }
3634 snd_pcm_hw_convert_from_old_params(params, oparams);
3635 err = snd_pcm_hw_params(substream, params);
3636 snd_pcm_hw_convert_to_old_params(oparams, params);
3637 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3638 if (!err)
3639 err = -EFAULT;
3640 }
3641
3642 kfree(oparams);
3643out:
3644 kfree(params);
3645 return err;
3646}
3647#endif /* CONFIG_SND_SUPPORT_OLD_API */
3648
3649#ifndef CONFIG_MMU
3650static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3651 unsigned long addr,
3652 unsigned long len,
3653 unsigned long pgoff,
3654 unsigned long flags)
3655{
3656 struct snd_pcm_file *pcm_file = file->private_data;
3657 struct snd_pcm_substream *substream = pcm_file->substream;
3658 struct snd_pcm_runtime *runtime = substream->runtime;
3659 unsigned long offset = pgoff << PAGE_SHIFT;
3660
3661 switch (offset) {
3662 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3663 return (unsigned long)runtime->status;
3664 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3665 return (unsigned long)runtime->control;
3666 default:
3667 return (unsigned long)runtime->dma_area + offset;
3668 }
3669}
3670#else
3671# define snd_pcm_get_unmapped_area NULL
3672#endif
3673
3674/*
3675 * Register section
3676 */
3677
3678const struct file_operations snd_pcm_f_ops[2] = {
3679 {
3680 .owner = THIS_MODULE,
3681 .write = snd_pcm_write,
3682 .write_iter = snd_pcm_writev,
3683 .open = snd_pcm_playback_open,
3684 .release = snd_pcm_release,
3685 .llseek = no_llseek,
3686 .poll = snd_pcm_playback_poll,
3687 .unlocked_ioctl = snd_pcm_playback_ioctl,
3688 .compat_ioctl = snd_pcm_ioctl_compat,
3689 .mmap = snd_pcm_mmap,
3690 .fasync = snd_pcm_fasync,
3691 .get_unmapped_area = snd_pcm_get_unmapped_area,
3692 },
3693 {
3694 .owner = THIS_MODULE,
3695 .read = snd_pcm_read,
3696 .read_iter = snd_pcm_readv,
3697 .open = snd_pcm_capture_open,
3698 .release = snd_pcm_release,
3699 .llseek = no_llseek,
3700 .poll = snd_pcm_capture_poll,
3701 .unlocked_ioctl = snd_pcm_capture_ioctl,
3702 .compat_ioctl = snd_pcm_ioctl_compat,
3703 .mmap = snd_pcm_mmap,
3704 .fasync = snd_pcm_fasync,
3705 .get_unmapped_area = snd_pcm_get_unmapped_area,
3706 }
3707};