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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_lock - 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
175/**
176 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
177 * @substream: PCM substream
178 * @flags: irq flags
179 *
180 * This is a counter-part of snd_pcm_stream_lock_irqsave().
181 */
182void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
183 unsigned long flags)
184{
185 if (substream->pcm->nonatomic)
186 mutex_unlock(&substream->self_group.mutex);
187 else
188 spin_unlock_irqrestore(&substream->self_group.lock, flags);
189}
190EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
191
192/* Run PCM ioctl ops */
193static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
194 unsigned cmd, void *arg)
195{
196 if (substream->ops->ioctl)
197 return substream->ops->ioctl(substream, cmd, arg);
198 else
199 return snd_pcm_lib_ioctl(substream, cmd, arg);
200}
201
202int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
203{
204 struct snd_pcm *pcm = substream->pcm;
205 struct snd_pcm_str *pstr = substream->pstr;
206
207 memset(info, 0, sizeof(*info));
208 info->card = pcm->card->number;
209 info->device = pcm->device;
210 info->stream = substream->stream;
211 info->subdevice = substream->number;
212 strlcpy(info->id, pcm->id, sizeof(info->id));
213 strlcpy(info->name, pcm->name, sizeof(info->name));
214 info->dev_class = pcm->dev_class;
215 info->dev_subclass = pcm->dev_subclass;
216 info->subdevices_count = pstr->substream_count;
217 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
218 strlcpy(info->subname, substream->name, sizeof(info->subname));
219
220 return 0;
221}
222
223int snd_pcm_info_user(struct snd_pcm_substream *substream,
224 struct snd_pcm_info __user * _info)
225{
226 struct snd_pcm_info *info;
227 int err;
228
229 info = kmalloc(sizeof(*info), GFP_KERNEL);
230 if (! info)
231 return -ENOMEM;
232 err = snd_pcm_info(substream, info);
233 if (err >= 0) {
234 if (copy_to_user(_info, info, sizeof(*info)))
235 err = -EFAULT;
236 }
237 kfree(info);
238 return err;
239}
240
241/* macro for simplified cast */
242#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
243
244static bool hw_support_mmap(struct snd_pcm_substream *substream)
245{
246 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
247 return false;
248
249 if (substream->ops->mmap ||
250 (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV &&
251 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC))
252 return true;
253
254 return dma_can_mmap(substream->dma_buffer.dev.dev);
255}
256
257static int constrain_mask_params(struct snd_pcm_substream *substream,
258 struct snd_pcm_hw_params *params)
259{
260 struct snd_pcm_hw_constraints *constrs =
261 &substream->runtime->hw_constraints;
262 struct snd_mask *m;
263 unsigned int k;
264 struct snd_mask old_mask;
265 int changed;
266
267 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
268 m = hw_param_mask(params, k);
269 if (snd_mask_empty(m))
270 return -EINVAL;
271
272 /* This parameter is not requested to change by a caller. */
273 if (!(params->rmask & PARAM_MASK_BIT(k)))
274 continue;
275
276 if (trace_hw_mask_param_enabled())
277 old_mask = *m;
278
279 changed = snd_mask_refine(m, constrs_mask(constrs, k));
280 if (changed < 0)
281 return changed;
282 if (changed == 0)
283 continue;
284
285 /* Set corresponding flag so that the caller gets it. */
286 trace_hw_mask_param(substream, k, 0, &old_mask, m);
287 params->cmask |= PARAM_MASK_BIT(k);
288 }
289
290 return 0;
291}
292
293static int constrain_interval_params(struct snd_pcm_substream *substream,
294 struct snd_pcm_hw_params *params)
295{
296 struct snd_pcm_hw_constraints *constrs =
297 &substream->runtime->hw_constraints;
298 struct snd_interval *i;
299 unsigned int k;
300 struct snd_interval old_interval;
301 int changed;
302
303 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
304 i = hw_param_interval(params, k);
305 if (snd_interval_empty(i))
306 return -EINVAL;
307
308 /* This parameter is not requested to change by a caller. */
309 if (!(params->rmask & PARAM_MASK_BIT(k)))
310 continue;
311
312 if (trace_hw_interval_param_enabled())
313 old_interval = *i;
314
315 changed = snd_interval_refine(i, constrs_interval(constrs, k));
316 if (changed < 0)
317 return changed;
318 if (changed == 0)
319 continue;
320
321 /* Set corresponding flag so that the caller gets it. */
322 trace_hw_interval_param(substream, k, 0, &old_interval, i);
323 params->cmask |= PARAM_MASK_BIT(k);
324 }
325
326 return 0;
327}
328
329static int constrain_params_by_rules(struct snd_pcm_substream *substream,
330 struct snd_pcm_hw_params *params)
331{
332 struct snd_pcm_hw_constraints *constrs =
333 &substream->runtime->hw_constraints;
334 unsigned int k;
335 unsigned int *rstamps;
336 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
337 unsigned int stamp;
338 struct snd_pcm_hw_rule *r;
339 unsigned int d;
340 struct snd_mask old_mask;
341 struct snd_interval old_interval;
342 bool again;
343 int changed, err = 0;
344
345 /*
346 * Each application of rule has own sequence number.
347 *
348 * Each member of 'rstamps' array represents the sequence number of
349 * recent application of corresponding rule.
350 */
351 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
352 if (!rstamps)
353 return -ENOMEM;
354
355 /*
356 * Each member of 'vstamps' array represents the sequence number of
357 * recent application of rule in which corresponding parameters were
358 * changed.
359 *
360 * In initial state, elements corresponding to parameters requested by
361 * a caller is 1. For unrequested parameters, corresponding members
362 * have 0 so that the parameters are never changed anymore.
363 */
364 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
365 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
366
367 /* Due to the above design, actual sequence number starts at 2. */
368 stamp = 2;
369retry:
370 /* Apply all rules in order. */
371 again = false;
372 for (k = 0; k < constrs->rules_num; k++) {
373 r = &constrs->rules[k];
374
375 /*
376 * Check condition bits of this rule. When the rule has
377 * some condition bits, parameter without the bits is
378 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
379 * is an example of the condition bits.
380 */
381 if (r->cond && !(r->cond & params->flags))
382 continue;
383
384 /*
385 * The 'deps' array includes maximum three dependencies
386 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
387 * member of this array is a sentinel and should be
388 * negative value.
389 *
390 * This rule should be processed in this time when dependent
391 * parameters were changed at former applications of the other
392 * rules.
393 */
394 for (d = 0; r->deps[d] >= 0; d++) {
395 if (vstamps[r->deps[d]] > rstamps[k])
396 break;
397 }
398 if (r->deps[d] < 0)
399 continue;
400
401 if (trace_hw_mask_param_enabled()) {
402 if (hw_is_mask(r->var))
403 old_mask = *hw_param_mask(params, r->var);
404 }
405 if (trace_hw_interval_param_enabled()) {
406 if (hw_is_interval(r->var))
407 old_interval = *hw_param_interval(params, r->var);
408 }
409
410 changed = r->func(params, r);
411 if (changed < 0) {
412 err = changed;
413 goto out;
414 }
415
416 /*
417 * When the parameter is changed, notify it to the caller
418 * by corresponding returned bit, then preparing for next
419 * iteration.
420 */
421 if (changed && r->var >= 0) {
422 if (hw_is_mask(r->var)) {
423 trace_hw_mask_param(substream, r->var,
424 k + 1, &old_mask,
425 hw_param_mask(params, r->var));
426 }
427 if (hw_is_interval(r->var)) {
428 trace_hw_interval_param(substream, r->var,
429 k + 1, &old_interval,
430 hw_param_interval(params, r->var));
431 }
432
433 params->cmask |= PARAM_MASK_BIT(r->var);
434 vstamps[r->var] = stamp;
435 again = true;
436 }
437
438 rstamps[k] = stamp++;
439 }
440
441 /* Iterate to evaluate all rules till no parameters are changed. */
442 if (again)
443 goto retry;
444
445 out:
446 kfree(rstamps);
447 return err;
448}
449
450static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
451 struct snd_pcm_hw_params *params)
452{
453 const struct snd_interval *i;
454 const struct snd_mask *m;
455 int err;
456
457 if (!params->msbits) {
458 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
459 if (snd_interval_single(i))
460 params->msbits = snd_interval_value(i);
461 }
462
463 if (!params->rate_den) {
464 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
465 if (snd_interval_single(i)) {
466 params->rate_num = snd_interval_value(i);
467 params->rate_den = 1;
468 }
469 }
470
471 if (!params->fifo_size) {
472 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
473 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
474 if (snd_mask_single(m) && snd_interval_single(i)) {
475 err = snd_pcm_ops_ioctl(substream,
476 SNDRV_PCM_IOCTL1_FIFO_SIZE,
477 params);
478 if (err < 0)
479 return err;
480 }
481 }
482
483 if (!params->info) {
484 params->info = substream->runtime->hw.info;
485 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
486 SNDRV_PCM_INFO_DRAIN_TRIGGER);
487 if (!hw_support_mmap(substream))
488 params->info &= ~(SNDRV_PCM_INFO_MMAP |
489 SNDRV_PCM_INFO_MMAP_VALID);
490 }
491
492 return 0;
493}
494
495int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
496 struct snd_pcm_hw_params *params)
497{
498 int err;
499
500 params->info = 0;
501 params->fifo_size = 0;
502 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
503 params->msbits = 0;
504 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
505 params->rate_num = 0;
506 params->rate_den = 0;
507 }
508
509 err = constrain_mask_params(substream, params);
510 if (err < 0)
511 return err;
512
513 err = constrain_interval_params(substream, params);
514 if (err < 0)
515 return err;
516
517 err = constrain_params_by_rules(substream, params);
518 if (err < 0)
519 return err;
520
521 params->rmask = 0;
522
523 return 0;
524}
525EXPORT_SYMBOL(snd_pcm_hw_refine);
526
527static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
528 struct snd_pcm_hw_params __user * _params)
529{
530 struct snd_pcm_hw_params *params;
531 int err;
532
533 params = memdup_user(_params, sizeof(*params));
534 if (IS_ERR(params))
535 return PTR_ERR(params);
536
537 err = snd_pcm_hw_refine(substream, params);
538 if (err < 0)
539 goto end;
540
541 err = fixup_unreferenced_params(substream, params);
542 if (err < 0)
543 goto end;
544
545 if (copy_to_user(_params, params, sizeof(*params)))
546 err = -EFAULT;
547end:
548 kfree(params);
549 return err;
550}
551
552static int period_to_usecs(struct snd_pcm_runtime *runtime)
553{
554 int usecs;
555
556 if (! runtime->rate)
557 return -1; /* invalid */
558
559 /* take 75% of period time as the deadline */
560 usecs = (750000 / runtime->rate) * runtime->period_size;
561 usecs += ((750000 % runtime->rate) * runtime->period_size) /
562 runtime->rate;
563
564 return usecs;
565}
566
567static void snd_pcm_set_state(struct snd_pcm_substream *substream,
568 snd_pcm_state_t state)
569{
570 snd_pcm_stream_lock_irq(substream);
571 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
572 substream->runtime->status->state = state;
573 snd_pcm_stream_unlock_irq(substream);
574}
575
576static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
577 int event)
578{
579#ifdef CONFIG_SND_PCM_TIMER
580 if (substream->timer)
581 snd_timer_notify(substream->timer, event,
582 &substream->runtime->trigger_tstamp);
583#endif
584}
585
586static void snd_pcm_sync_stop(struct snd_pcm_substream *substream)
587{
588 if (substream->runtime->stop_operating) {
589 substream->runtime->stop_operating = false;
590 if (substream->ops->sync_stop)
591 substream->ops->sync_stop(substream);
592 else if (substream->pcm->card->sync_irq > 0)
593 synchronize_irq(substream->pcm->card->sync_irq);
594 }
595}
596
597/**
598 * snd_pcm_hw_param_choose - choose a configuration defined by @params
599 * @pcm: PCM instance
600 * @params: the hw_params instance
601 *
602 * Choose one configuration from configuration space defined by @params.
603 * The configuration chosen is that obtained fixing in this order:
604 * first access, first format, first subformat, min channels,
605 * min rate, min period time, max buffer size, min tick time
606 *
607 * Return: Zero if successful, or a negative error code on failure.
608 */
609static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
610 struct snd_pcm_hw_params *params)
611{
612 static const int vars[] = {
613 SNDRV_PCM_HW_PARAM_ACCESS,
614 SNDRV_PCM_HW_PARAM_FORMAT,
615 SNDRV_PCM_HW_PARAM_SUBFORMAT,
616 SNDRV_PCM_HW_PARAM_CHANNELS,
617 SNDRV_PCM_HW_PARAM_RATE,
618 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
619 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
620 SNDRV_PCM_HW_PARAM_TICK_TIME,
621 -1
622 };
623 const int *v;
624 struct snd_mask old_mask;
625 struct snd_interval old_interval;
626 int changed;
627
628 for (v = vars; *v != -1; v++) {
629 /* Keep old parameter to trace. */
630 if (trace_hw_mask_param_enabled()) {
631 if (hw_is_mask(*v))
632 old_mask = *hw_param_mask(params, *v);
633 }
634 if (trace_hw_interval_param_enabled()) {
635 if (hw_is_interval(*v))
636 old_interval = *hw_param_interval(params, *v);
637 }
638 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
639 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
640 else
641 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
642 if (changed < 0)
643 return changed;
644 if (changed == 0)
645 continue;
646
647 /* Trace the changed parameter. */
648 if (hw_is_mask(*v)) {
649 trace_hw_mask_param(pcm, *v, 0, &old_mask,
650 hw_param_mask(params, *v));
651 }
652 if (hw_is_interval(*v)) {
653 trace_hw_interval_param(pcm, *v, 0, &old_interval,
654 hw_param_interval(params, *v));
655 }
656 }
657
658 return 0;
659}
660
661static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
662 struct snd_pcm_hw_params *params)
663{
664 struct snd_pcm_runtime *runtime;
665 int err, usecs;
666 unsigned int bits;
667 snd_pcm_uframes_t frames;
668
669 if (PCM_RUNTIME_CHECK(substream))
670 return -ENXIO;
671 runtime = substream->runtime;
672 snd_pcm_stream_lock_irq(substream);
673 switch (runtime->status->state) {
674 case SNDRV_PCM_STATE_OPEN:
675 case SNDRV_PCM_STATE_SETUP:
676 case SNDRV_PCM_STATE_PREPARED:
677 break;
678 default:
679 snd_pcm_stream_unlock_irq(substream);
680 return -EBADFD;
681 }
682 snd_pcm_stream_unlock_irq(substream);
683#if IS_ENABLED(CONFIG_SND_PCM_OSS)
684 if (!substream->oss.oss)
685#endif
686 if (atomic_read(&substream->mmap_count))
687 return -EBADFD;
688
689 snd_pcm_sync_stop(substream);
690
691 params->rmask = ~0U;
692 err = snd_pcm_hw_refine(substream, params);
693 if (err < 0)
694 goto _error;
695
696 err = snd_pcm_hw_params_choose(substream, params);
697 if (err < 0)
698 goto _error;
699
700 err = fixup_unreferenced_params(substream, params);
701 if (err < 0)
702 goto _error;
703
704 if (substream->managed_buffer_alloc) {
705 err = snd_pcm_lib_malloc_pages(substream,
706 params_buffer_bytes(params));
707 if (err < 0)
708 goto _error;
709 runtime->buffer_changed = err > 0;
710 }
711
712 if (substream->ops->hw_params != NULL) {
713 err = substream->ops->hw_params(substream, params);
714 if (err < 0)
715 goto _error;
716 }
717
718 runtime->access = params_access(params);
719 runtime->format = params_format(params);
720 runtime->subformat = params_subformat(params);
721 runtime->channels = params_channels(params);
722 runtime->rate = params_rate(params);
723 runtime->period_size = params_period_size(params);
724 runtime->periods = params_periods(params);
725 runtime->buffer_size = params_buffer_size(params);
726 runtime->info = params->info;
727 runtime->rate_num = params->rate_num;
728 runtime->rate_den = params->rate_den;
729 runtime->no_period_wakeup =
730 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
731 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
732
733 bits = snd_pcm_format_physical_width(runtime->format);
734 runtime->sample_bits = bits;
735 bits *= runtime->channels;
736 runtime->frame_bits = bits;
737 frames = 1;
738 while (bits % 8 != 0) {
739 bits *= 2;
740 frames *= 2;
741 }
742 runtime->byte_align = bits / 8;
743 runtime->min_align = frames;
744
745 /* Default sw params */
746 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
747 runtime->period_step = 1;
748 runtime->control->avail_min = runtime->period_size;
749 runtime->start_threshold = 1;
750 runtime->stop_threshold = runtime->buffer_size;
751 runtime->silence_threshold = 0;
752 runtime->silence_size = 0;
753 runtime->boundary = runtime->buffer_size;
754 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
755 runtime->boundary *= 2;
756
757 /* clear the buffer for avoiding possible kernel info leaks */
758 if (runtime->dma_area && !substream->ops->copy_user)
759 memset(runtime->dma_area, 0, runtime->dma_bytes);
760
761 snd_pcm_timer_resolution_change(substream);
762 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
763
764 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
765 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
766 if ((usecs = period_to_usecs(runtime)) >= 0)
767 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
768 usecs);
769 return 0;
770 _error:
771 /* hardware might be unusable from this time,
772 so we force application to retry to set
773 the correct hardware parameter settings */
774 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
775 if (substream->ops->hw_free != NULL)
776 substream->ops->hw_free(substream);
777 if (substream->managed_buffer_alloc)
778 snd_pcm_lib_free_pages(substream);
779 return err;
780}
781
782static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
783 struct snd_pcm_hw_params __user * _params)
784{
785 struct snd_pcm_hw_params *params;
786 int err;
787
788 params = memdup_user(_params, sizeof(*params));
789 if (IS_ERR(params))
790 return PTR_ERR(params);
791
792 err = snd_pcm_hw_params(substream, params);
793 if (err < 0)
794 goto end;
795
796 if (copy_to_user(_params, params, sizeof(*params)))
797 err = -EFAULT;
798end:
799 kfree(params);
800 return err;
801}
802
803static int do_hw_free(struct snd_pcm_substream *substream)
804{
805 int result = 0;
806
807 snd_pcm_sync_stop(substream);
808 if (substream->ops->hw_free)
809 result = substream->ops->hw_free(substream);
810 if (substream->managed_buffer_alloc)
811 snd_pcm_lib_free_pages(substream);
812 return result;
813}
814
815static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
816{
817 struct snd_pcm_runtime *runtime;
818 int result;
819
820 if (PCM_RUNTIME_CHECK(substream))
821 return -ENXIO;
822 runtime = substream->runtime;
823 snd_pcm_stream_lock_irq(substream);
824 switch (runtime->status->state) {
825 case SNDRV_PCM_STATE_SETUP:
826 case SNDRV_PCM_STATE_PREPARED:
827 break;
828 default:
829 snd_pcm_stream_unlock_irq(substream);
830 return -EBADFD;
831 }
832 snd_pcm_stream_unlock_irq(substream);
833 if (atomic_read(&substream->mmap_count))
834 return -EBADFD;
835 result = do_hw_free(substream);
836 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
837 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
838 return result;
839}
840
841static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
842 struct snd_pcm_sw_params *params)
843{
844 struct snd_pcm_runtime *runtime;
845 int err;
846
847 if (PCM_RUNTIME_CHECK(substream))
848 return -ENXIO;
849 runtime = substream->runtime;
850 snd_pcm_stream_lock_irq(substream);
851 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
852 snd_pcm_stream_unlock_irq(substream);
853 return -EBADFD;
854 }
855 snd_pcm_stream_unlock_irq(substream);
856
857 if (params->tstamp_mode < 0 ||
858 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
859 return -EINVAL;
860 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
861 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
862 return -EINVAL;
863 if (params->avail_min == 0)
864 return -EINVAL;
865 if (params->silence_size >= runtime->boundary) {
866 if (params->silence_threshold != 0)
867 return -EINVAL;
868 } else {
869 if (params->silence_size > params->silence_threshold)
870 return -EINVAL;
871 if (params->silence_threshold > runtime->buffer_size)
872 return -EINVAL;
873 }
874 err = 0;
875 snd_pcm_stream_lock_irq(substream);
876 runtime->tstamp_mode = params->tstamp_mode;
877 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
878 runtime->tstamp_type = params->tstamp_type;
879 runtime->period_step = params->period_step;
880 runtime->control->avail_min = params->avail_min;
881 runtime->start_threshold = params->start_threshold;
882 runtime->stop_threshold = params->stop_threshold;
883 runtime->silence_threshold = params->silence_threshold;
884 runtime->silence_size = params->silence_size;
885 params->boundary = runtime->boundary;
886 if (snd_pcm_running(substream)) {
887 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
888 runtime->silence_size > 0)
889 snd_pcm_playback_silence(substream, ULONG_MAX);
890 err = snd_pcm_update_state(substream, runtime);
891 }
892 snd_pcm_stream_unlock_irq(substream);
893 return err;
894}
895
896static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
897 struct snd_pcm_sw_params __user * _params)
898{
899 struct snd_pcm_sw_params params;
900 int err;
901 if (copy_from_user(¶ms, _params, sizeof(params)))
902 return -EFAULT;
903 err = snd_pcm_sw_params(substream, ¶ms);
904 if (copy_to_user(_params, ¶ms, sizeof(params)))
905 return -EFAULT;
906 return err;
907}
908
909static inline snd_pcm_uframes_t
910snd_pcm_calc_delay(struct snd_pcm_substream *substream)
911{
912 snd_pcm_uframes_t delay;
913
914 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
915 delay = snd_pcm_playback_hw_avail(substream->runtime);
916 else
917 delay = snd_pcm_capture_avail(substream->runtime);
918 return delay + substream->runtime->delay;
919}
920
921int snd_pcm_status64(struct snd_pcm_substream *substream,
922 struct snd_pcm_status64 *status)
923{
924 struct snd_pcm_runtime *runtime = substream->runtime;
925
926 snd_pcm_stream_lock_irq(substream);
927
928 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
929 &runtime->audio_tstamp_config);
930
931 /* backwards compatible behavior */
932 if (runtime->audio_tstamp_config.type_requested ==
933 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
934 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
935 runtime->audio_tstamp_config.type_requested =
936 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
937 else
938 runtime->audio_tstamp_config.type_requested =
939 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
940 runtime->audio_tstamp_report.valid = 0;
941 } else
942 runtime->audio_tstamp_report.valid = 1;
943
944 status->state = runtime->status->state;
945 status->suspended_state = runtime->status->suspended_state;
946 if (status->state == SNDRV_PCM_STATE_OPEN)
947 goto _end;
948 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
949 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
950 if (snd_pcm_running(substream)) {
951 snd_pcm_update_hw_ptr(substream);
952 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
953 status->tstamp_sec = runtime->status->tstamp.tv_sec;
954 status->tstamp_nsec =
955 runtime->status->tstamp.tv_nsec;
956 status->driver_tstamp_sec =
957 runtime->driver_tstamp.tv_sec;
958 status->driver_tstamp_nsec =
959 runtime->driver_tstamp.tv_nsec;
960 status->audio_tstamp_sec =
961 runtime->status->audio_tstamp.tv_sec;
962 status->audio_tstamp_nsec =
963 runtime->status->audio_tstamp.tv_nsec;
964 if (runtime->audio_tstamp_report.valid == 1)
965 /* backwards compatibility, no report provided in COMPAT mode */
966 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
967 &status->audio_tstamp_accuracy,
968 &runtime->audio_tstamp_report);
969
970 goto _tstamp_end;
971 }
972 } else {
973 /* get tstamp only in fallback mode and only if enabled */
974 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
975 struct timespec64 tstamp;
976
977 snd_pcm_gettime(runtime, &tstamp);
978 status->tstamp_sec = tstamp.tv_sec;
979 status->tstamp_nsec = tstamp.tv_nsec;
980 }
981 }
982 _tstamp_end:
983 status->appl_ptr = runtime->control->appl_ptr;
984 status->hw_ptr = runtime->status->hw_ptr;
985 status->avail = snd_pcm_avail(substream);
986 status->delay = snd_pcm_running(substream) ?
987 snd_pcm_calc_delay(substream) : 0;
988 status->avail_max = runtime->avail_max;
989 status->overrange = runtime->overrange;
990 runtime->avail_max = 0;
991 runtime->overrange = 0;
992 _end:
993 snd_pcm_stream_unlock_irq(substream);
994 return 0;
995}
996
997static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
998 struct snd_pcm_status64 __user * _status,
999 bool ext)
1000{
1001 struct snd_pcm_status64 status;
1002 int res;
1003
1004 memset(&status, 0, sizeof(status));
1005 /*
1006 * with extension, parameters are read/write,
1007 * get audio_tstamp_data from user,
1008 * ignore rest of status structure
1009 */
1010 if (ext && get_user(status.audio_tstamp_data,
1011 (u32 __user *)(&_status->audio_tstamp_data)))
1012 return -EFAULT;
1013 res = snd_pcm_status64(substream, &status);
1014 if (res < 0)
1015 return res;
1016 if (copy_to_user(_status, &status, sizeof(status)))
1017 return -EFAULT;
1018 return 0;
1019}
1020
1021static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1022 struct snd_pcm_status32 __user * _status,
1023 bool ext)
1024{
1025 struct snd_pcm_status64 status64;
1026 struct snd_pcm_status32 status32;
1027 int res;
1028
1029 memset(&status64, 0, sizeof(status64));
1030 memset(&status32, 0, sizeof(status32));
1031 /*
1032 * with extension, parameters are read/write,
1033 * get audio_tstamp_data from user,
1034 * ignore rest of status structure
1035 */
1036 if (ext && get_user(status64.audio_tstamp_data,
1037 (u32 __user *)(&_status->audio_tstamp_data)))
1038 return -EFAULT;
1039 res = snd_pcm_status64(substream, &status64);
1040 if (res < 0)
1041 return res;
1042
1043 status32 = (struct snd_pcm_status32) {
1044 .state = status64.state,
1045 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1046 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1047 .tstamp_sec = status64.tstamp_sec,
1048 .tstamp_nsec = status64.tstamp_nsec,
1049 .appl_ptr = status64.appl_ptr,
1050 .hw_ptr = status64.hw_ptr,
1051 .delay = status64.delay,
1052 .avail = status64.avail,
1053 .avail_max = status64.avail_max,
1054 .overrange = status64.overrange,
1055 .suspended_state = status64.suspended_state,
1056 .audio_tstamp_data = status64.audio_tstamp_data,
1057 .audio_tstamp_sec = status64.audio_tstamp_sec,
1058 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1059 .driver_tstamp_sec = status64.audio_tstamp_sec,
1060 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1061 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1062 };
1063
1064 if (copy_to_user(_status, &status32, sizeof(status32)))
1065 return -EFAULT;
1066
1067 return 0;
1068}
1069
1070static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1071 struct snd_pcm_channel_info * info)
1072{
1073 struct snd_pcm_runtime *runtime;
1074 unsigned int channel;
1075
1076 channel = info->channel;
1077 runtime = substream->runtime;
1078 snd_pcm_stream_lock_irq(substream);
1079 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
1080 snd_pcm_stream_unlock_irq(substream);
1081 return -EBADFD;
1082 }
1083 snd_pcm_stream_unlock_irq(substream);
1084 if (channel >= runtime->channels)
1085 return -EINVAL;
1086 memset(info, 0, sizeof(*info));
1087 info->channel = channel;
1088 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1089}
1090
1091static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1092 struct snd_pcm_channel_info __user * _info)
1093{
1094 struct snd_pcm_channel_info info;
1095 int res;
1096
1097 if (copy_from_user(&info, _info, sizeof(info)))
1098 return -EFAULT;
1099 res = snd_pcm_channel_info(substream, &info);
1100 if (res < 0)
1101 return res;
1102 if (copy_to_user(_info, &info, sizeof(info)))
1103 return -EFAULT;
1104 return 0;
1105}
1106
1107static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1108{
1109 struct snd_pcm_runtime *runtime = substream->runtime;
1110 if (runtime->trigger_master == NULL)
1111 return;
1112 if (runtime->trigger_master == substream) {
1113 if (!runtime->trigger_tstamp_latched)
1114 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1115 } else {
1116 snd_pcm_trigger_tstamp(runtime->trigger_master);
1117 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1118 }
1119 runtime->trigger_master = NULL;
1120}
1121
1122#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
1123
1124struct action_ops {
1125 int (*pre_action)(struct snd_pcm_substream *substream,
1126 snd_pcm_state_t state);
1127 int (*do_action)(struct snd_pcm_substream *substream,
1128 snd_pcm_state_t state);
1129 void (*undo_action)(struct snd_pcm_substream *substream,
1130 snd_pcm_state_t state);
1131 void (*post_action)(struct snd_pcm_substream *substream,
1132 snd_pcm_state_t state);
1133};
1134
1135/*
1136 * this functions is core for handling of linked stream
1137 * Note: the stream state might be changed also on failure
1138 * Note2: call with calling stream lock + link lock
1139 */
1140static int snd_pcm_action_group(const struct action_ops *ops,
1141 struct snd_pcm_substream *substream,
1142 snd_pcm_state_t state,
1143 bool do_lock)
1144{
1145 struct snd_pcm_substream *s = NULL;
1146 struct snd_pcm_substream *s1;
1147 int res = 0, depth = 1;
1148
1149 snd_pcm_group_for_each_entry(s, substream) {
1150 if (do_lock && s != substream) {
1151 if (s->pcm->nonatomic)
1152 mutex_lock_nested(&s->self_group.mutex, depth);
1153 else
1154 spin_lock_nested(&s->self_group.lock, depth);
1155 depth++;
1156 }
1157 res = ops->pre_action(s, state);
1158 if (res < 0)
1159 goto _unlock;
1160 }
1161 snd_pcm_group_for_each_entry(s, substream) {
1162 res = ops->do_action(s, state);
1163 if (res < 0) {
1164 if (ops->undo_action) {
1165 snd_pcm_group_for_each_entry(s1, substream) {
1166 if (s1 == s) /* failed stream */
1167 break;
1168 ops->undo_action(s1, state);
1169 }
1170 }
1171 s = NULL; /* unlock all */
1172 goto _unlock;
1173 }
1174 }
1175 snd_pcm_group_for_each_entry(s, substream) {
1176 ops->post_action(s, state);
1177 }
1178 _unlock:
1179 if (do_lock) {
1180 /* unlock streams */
1181 snd_pcm_group_for_each_entry(s1, substream) {
1182 if (s1 != substream) {
1183 if (s1->pcm->nonatomic)
1184 mutex_unlock(&s1->self_group.mutex);
1185 else
1186 spin_unlock(&s1->self_group.lock);
1187 }
1188 if (s1 == s) /* end */
1189 break;
1190 }
1191 }
1192 return res;
1193}
1194
1195/*
1196 * Note: call with stream lock
1197 */
1198static int snd_pcm_action_single(const struct action_ops *ops,
1199 struct snd_pcm_substream *substream,
1200 snd_pcm_state_t state)
1201{
1202 int res;
1203
1204 res = ops->pre_action(substream, state);
1205 if (res < 0)
1206 return res;
1207 res = ops->do_action(substream, state);
1208 if (res == 0)
1209 ops->post_action(substream, state);
1210 else if (ops->undo_action)
1211 ops->undo_action(substream, state);
1212 return res;
1213}
1214
1215static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1216 struct snd_pcm_group *new_group)
1217{
1218 substream->group = new_group;
1219 list_move(&substream->link_list, &new_group->substreams);
1220}
1221
1222/*
1223 * Unref and unlock the group, but keep the stream lock;
1224 * when the group becomes empty and no longer referred, destroy itself
1225 */
1226static void snd_pcm_group_unref(struct snd_pcm_group *group,
1227 struct snd_pcm_substream *substream)
1228{
1229 bool do_free;
1230
1231 if (!group)
1232 return;
1233 do_free = refcount_dec_and_test(&group->refs);
1234 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1235 if (do_free)
1236 kfree(group);
1237}
1238
1239/*
1240 * Lock the group inside a stream lock and reference it;
1241 * return the locked group object, or NULL if not linked
1242 */
1243static struct snd_pcm_group *
1244snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1245{
1246 bool nonatomic = substream->pcm->nonatomic;
1247 struct snd_pcm_group *group;
1248 bool trylock;
1249
1250 for (;;) {
1251 if (!snd_pcm_stream_linked(substream))
1252 return NULL;
1253 group = substream->group;
1254 /* block freeing the group object */
1255 refcount_inc(&group->refs);
1256
1257 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1258 spin_trylock(&group->lock);
1259 if (trylock)
1260 break; /* OK */
1261
1262 /* re-lock for avoiding ABBA deadlock */
1263 snd_pcm_stream_unlock(substream);
1264 snd_pcm_group_lock(group, nonatomic);
1265 snd_pcm_stream_lock(substream);
1266
1267 /* check the group again; the above opens a small race window */
1268 if (substream->group == group)
1269 break; /* OK */
1270 /* group changed, try again */
1271 snd_pcm_group_unref(group, substream);
1272 }
1273 return group;
1274}
1275
1276/*
1277 * Note: call with stream lock
1278 */
1279static int snd_pcm_action(const struct action_ops *ops,
1280 struct snd_pcm_substream *substream,
1281 snd_pcm_state_t state)
1282{
1283 struct snd_pcm_group *group;
1284 int res;
1285
1286 group = snd_pcm_stream_group_ref(substream);
1287 if (group)
1288 res = snd_pcm_action_group(ops, substream, state, true);
1289 else
1290 res = snd_pcm_action_single(ops, substream, state);
1291 snd_pcm_group_unref(group, substream);
1292 return res;
1293}
1294
1295/*
1296 * Note: don't use any locks before
1297 */
1298static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1299 struct snd_pcm_substream *substream,
1300 snd_pcm_state_t state)
1301{
1302 int res;
1303
1304 snd_pcm_stream_lock_irq(substream);
1305 res = snd_pcm_action(ops, substream, state);
1306 snd_pcm_stream_unlock_irq(substream);
1307 return res;
1308}
1309
1310/*
1311 */
1312static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1313 struct snd_pcm_substream *substream,
1314 snd_pcm_state_t state)
1315{
1316 int res;
1317
1318 /* Guarantee the group members won't change during non-atomic action */
1319 down_read(&snd_pcm_link_rwsem);
1320 if (snd_pcm_stream_linked(substream))
1321 res = snd_pcm_action_group(ops, substream, state, false);
1322 else
1323 res = snd_pcm_action_single(ops, substream, state);
1324 up_read(&snd_pcm_link_rwsem);
1325 return res;
1326}
1327
1328/*
1329 * start callbacks
1330 */
1331static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1332 snd_pcm_state_t state)
1333{
1334 struct snd_pcm_runtime *runtime = substream->runtime;
1335 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1336 return -EBADFD;
1337 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1338 !snd_pcm_playback_data(substream))
1339 return -EPIPE;
1340 runtime->trigger_tstamp_latched = false;
1341 runtime->trigger_master = substream;
1342 return 0;
1343}
1344
1345static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1346 snd_pcm_state_t state)
1347{
1348 if (substream->runtime->trigger_master != substream)
1349 return 0;
1350 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1351}
1352
1353static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1354 snd_pcm_state_t state)
1355{
1356 if (substream->runtime->trigger_master == substream)
1357 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1358}
1359
1360static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1361 snd_pcm_state_t state)
1362{
1363 struct snd_pcm_runtime *runtime = substream->runtime;
1364 snd_pcm_trigger_tstamp(substream);
1365 runtime->hw_ptr_jiffies = jiffies;
1366 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1367 runtime->rate;
1368 runtime->status->state = state;
1369 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1370 runtime->silence_size > 0)
1371 snd_pcm_playback_silence(substream, ULONG_MAX);
1372 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1373}
1374
1375static const struct action_ops snd_pcm_action_start = {
1376 .pre_action = snd_pcm_pre_start,
1377 .do_action = snd_pcm_do_start,
1378 .undo_action = snd_pcm_undo_start,
1379 .post_action = snd_pcm_post_start
1380};
1381
1382/**
1383 * snd_pcm_start - start all linked streams
1384 * @substream: the PCM substream instance
1385 *
1386 * Return: Zero if successful, or a negative error code.
1387 * The stream lock must be acquired before calling this function.
1388 */
1389int snd_pcm_start(struct snd_pcm_substream *substream)
1390{
1391 return snd_pcm_action(&snd_pcm_action_start, substream,
1392 SNDRV_PCM_STATE_RUNNING);
1393}
1394
1395/* take the stream lock and start the streams */
1396static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1397{
1398 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1399 SNDRV_PCM_STATE_RUNNING);
1400}
1401
1402/*
1403 * stop callbacks
1404 */
1405static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1406 snd_pcm_state_t state)
1407{
1408 struct snd_pcm_runtime *runtime = substream->runtime;
1409 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1410 return -EBADFD;
1411 runtime->trigger_master = substream;
1412 return 0;
1413}
1414
1415static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1416 snd_pcm_state_t state)
1417{
1418 if (substream->runtime->trigger_master == substream &&
1419 snd_pcm_running(substream))
1420 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1421 return 0; /* unconditonally stop all substreams */
1422}
1423
1424static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1425 snd_pcm_state_t state)
1426{
1427 struct snd_pcm_runtime *runtime = substream->runtime;
1428 if (runtime->status->state != state) {
1429 snd_pcm_trigger_tstamp(substream);
1430 runtime->status->state = state;
1431 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1432 }
1433 runtime->stop_operating = true;
1434 wake_up(&runtime->sleep);
1435 wake_up(&runtime->tsleep);
1436}
1437
1438static const struct action_ops snd_pcm_action_stop = {
1439 .pre_action = snd_pcm_pre_stop,
1440 .do_action = snd_pcm_do_stop,
1441 .post_action = snd_pcm_post_stop
1442};
1443
1444/**
1445 * snd_pcm_stop - try to stop all running streams in the substream group
1446 * @substream: the PCM substream instance
1447 * @state: PCM state after stopping the stream
1448 *
1449 * The state of each stream is then changed to the given state unconditionally.
1450 *
1451 * Return: Zero if successful, or a negative error code.
1452 */
1453int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1454{
1455 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1456}
1457EXPORT_SYMBOL(snd_pcm_stop);
1458
1459/**
1460 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1461 * @substream: the PCM substream
1462 *
1463 * After stopping, the state is changed to SETUP.
1464 * Unlike snd_pcm_stop(), this affects only the given stream.
1465 *
1466 * Return: Zero if succesful, or a negative error code.
1467 */
1468int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1469{
1470 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1471 SNDRV_PCM_STATE_SETUP);
1472}
1473
1474/**
1475 * snd_pcm_stop_xrun - stop the running streams as XRUN
1476 * @substream: the PCM substream instance
1477 *
1478 * This stops the given running substream (and all linked substreams) as XRUN.
1479 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1480 *
1481 * Return: Zero if successful, or a negative error code.
1482 */
1483int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1484{
1485 unsigned long flags;
1486
1487 snd_pcm_stream_lock_irqsave(substream, flags);
1488 if (substream->runtime && snd_pcm_running(substream))
1489 __snd_pcm_xrun(substream);
1490 snd_pcm_stream_unlock_irqrestore(substream, flags);
1491 return 0;
1492}
1493EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1494
1495/*
1496 * pause callbacks: pass boolean (to start pause or resume) as state argument
1497 */
1498#define pause_pushed(state) (__force bool)(state)
1499
1500static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1501 snd_pcm_state_t state)
1502{
1503 struct snd_pcm_runtime *runtime = substream->runtime;
1504 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1505 return -ENOSYS;
1506 if (pause_pushed(state)) {
1507 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1508 return -EBADFD;
1509 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1510 return -EBADFD;
1511 runtime->trigger_master = substream;
1512 return 0;
1513}
1514
1515static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1516 snd_pcm_state_t state)
1517{
1518 if (substream->runtime->trigger_master != substream)
1519 return 0;
1520 /* some drivers might use hw_ptr to recover from the pause -
1521 update the hw_ptr now */
1522 if (pause_pushed(state))
1523 snd_pcm_update_hw_ptr(substream);
1524 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1525 * a delta between the current jiffies, this gives a large enough
1526 * delta, effectively to skip the check once.
1527 */
1528 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1529 return substream->ops->trigger(substream,
1530 pause_pushed(state) ?
1531 SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1532 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1533}
1534
1535static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1536 snd_pcm_state_t state)
1537{
1538 if (substream->runtime->trigger_master == substream)
1539 substream->ops->trigger(substream,
1540 pause_pushed(state) ?
1541 SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1542 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1543}
1544
1545static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1546 snd_pcm_state_t state)
1547{
1548 struct snd_pcm_runtime *runtime = substream->runtime;
1549 snd_pcm_trigger_tstamp(substream);
1550 if (pause_pushed(state)) {
1551 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1552 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1553 wake_up(&runtime->sleep);
1554 wake_up(&runtime->tsleep);
1555 } else {
1556 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1557 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1558 }
1559}
1560
1561static const struct action_ops snd_pcm_action_pause = {
1562 .pre_action = snd_pcm_pre_pause,
1563 .do_action = snd_pcm_do_pause,
1564 .undo_action = snd_pcm_undo_pause,
1565 .post_action = snd_pcm_post_pause
1566};
1567
1568/*
1569 * Push/release the pause for all linked streams.
1570 */
1571static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1572{
1573 return snd_pcm_action(&snd_pcm_action_pause, substream,
1574 (__force snd_pcm_state_t)push);
1575}
1576
1577static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1578 bool push)
1579{
1580 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1581 (__force snd_pcm_state_t)push);
1582}
1583
1584#ifdef CONFIG_PM
1585/* suspend callback: state argument ignored */
1586
1587static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1588 snd_pcm_state_t state)
1589{
1590 struct snd_pcm_runtime *runtime = substream->runtime;
1591 switch (runtime->status->state) {
1592 case SNDRV_PCM_STATE_SUSPENDED:
1593 return -EBUSY;
1594 /* unresumable PCM state; return -EBUSY for skipping suspend */
1595 case SNDRV_PCM_STATE_OPEN:
1596 case SNDRV_PCM_STATE_SETUP:
1597 case SNDRV_PCM_STATE_DISCONNECTED:
1598 return -EBUSY;
1599 }
1600 runtime->trigger_master = substream;
1601 return 0;
1602}
1603
1604static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1605 snd_pcm_state_t state)
1606{
1607 struct snd_pcm_runtime *runtime = substream->runtime;
1608 if (runtime->trigger_master != substream)
1609 return 0;
1610 if (! snd_pcm_running(substream))
1611 return 0;
1612 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1613 return 0; /* suspend unconditionally */
1614}
1615
1616static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1617 snd_pcm_state_t state)
1618{
1619 struct snd_pcm_runtime *runtime = substream->runtime;
1620 snd_pcm_trigger_tstamp(substream);
1621 runtime->status->suspended_state = runtime->status->state;
1622 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1623 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1624 wake_up(&runtime->sleep);
1625 wake_up(&runtime->tsleep);
1626}
1627
1628static const struct action_ops snd_pcm_action_suspend = {
1629 .pre_action = snd_pcm_pre_suspend,
1630 .do_action = snd_pcm_do_suspend,
1631 .post_action = snd_pcm_post_suspend
1632};
1633
1634/*
1635 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1636 * @substream: the PCM substream
1637 *
1638 * After this call, all streams are changed to SUSPENDED state.
1639 *
1640 * Return: Zero if successful, or a negative error code.
1641 */
1642static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1643{
1644 int err;
1645 unsigned long flags;
1646
1647 snd_pcm_stream_lock_irqsave(substream, flags);
1648 err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1649 ACTION_ARG_IGNORE);
1650 snd_pcm_stream_unlock_irqrestore(substream, flags);
1651 return err;
1652}
1653
1654/**
1655 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1656 * @pcm: the PCM instance
1657 *
1658 * After this call, all streams are changed to SUSPENDED state.
1659 *
1660 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1661 */
1662int snd_pcm_suspend_all(struct snd_pcm *pcm)
1663{
1664 struct snd_pcm_substream *substream;
1665 int stream, err = 0;
1666
1667 if (! pcm)
1668 return 0;
1669
1670 for (stream = 0; stream < 2; stream++) {
1671 for (substream = pcm->streams[stream].substream;
1672 substream; substream = substream->next) {
1673 /* FIXME: the open/close code should lock this as well */
1674 if (substream->runtime == NULL)
1675 continue;
1676
1677 /*
1678 * Skip BE dai link PCM's that are internal and may
1679 * not have their substream ops set.
1680 */
1681 if (!substream->ops)
1682 continue;
1683
1684 err = snd_pcm_suspend(substream);
1685 if (err < 0 && err != -EBUSY)
1686 return err;
1687 }
1688 }
1689 return 0;
1690}
1691EXPORT_SYMBOL(snd_pcm_suspend_all);
1692
1693/* resume callbacks: state argument ignored */
1694
1695static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1696 snd_pcm_state_t state)
1697{
1698 struct snd_pcm_runtime *runtime = substream->runtime;
1699 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1700 return -ENOSYS;
1701 runtime->trigger_master = substream;
1702 return 0;
1703}
1704
1705static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1706 snd_pcm_state_t state)
1707{
1708 struct snd_pcm_runtime *runtime = substream->runtime;
1709 if (runtime->trigger_master != substream)
1710 return 0;
1711 /* DMA not running previously? */
1712 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1713 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1714 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1715 return 0;
1716 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1717}
1718
1719static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1720 snd_pcm_state_t state)
1721{
1722 if (substream->runtime->trigger_master == substream &&
1723 snd_pcm_running(substream))
1724 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1725}
1726
1727static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1728 snd_pcm_state_t state)
1729{
1730 struct snd_pcm_runtime *runtime = substream->runtime;
1731 snd_pcm_trigger_tstamp(substream);
1732 runtime->status->state = runtime->status->suspended_state;
1733 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1734 snd_pcm_sync_stop(substream);
1735}
1736
1737static const struct action_ops snd_pcm_action_resume = {
1738 .pre_action = snd_pcm_pre_resume,
1739 .do_action = snd_pcm_do_resume,
1740 .undo_action = snd_pcm_undo_resume,
1741 .post_action = snd_pcm_post_resume
1742};
1743
1744static int snd_pcm_resume(struct snd_pcm_substream *substream)
1745{
1746 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1747 ACTION_ARG_IGNORE);
1748}
1749
1750#else
1751
1752static int snd_pcm_resume(struct snd_pcm_substream *substream)
1753{
1754 return -ENOSYS;
1755}
1756
1757#endif /* CONFIG_PM */
1758
1759/*
1760 * xrun ioctl
1761 *
1762 * Change the RUNNING stream(s) to XRUN state.
1763 */
1764static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1765{
1766 struct snd_pcm_runtime *runtime = substream->runtime;
1767 int result;
1768
1769 snd_pcm_stream_lock_irq(substream);
1770 switch (runtime->status->state) {
1771 case SNDRV_PCM_STATE_XRUN:
1772 result = 0; /* already there */
1773 break;
1774 case SNDRV_PCM_STATE_RUNNING:
1775 __snd_pcm_xrun(substream);
1776 result = 0;
1777 break;
1778 default:
1779 result = -EBADFD;
1780 }
1781 snd_pcm_stream_unlock_irq(substream);
1782 return result;
1783}
1784
1785/*
1786 * reset ioctl
1787 */
1788/* reset callbacks: state argument ignored */
1789static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1790 snd_pcm_state_t state)
1791{
1792 struct snd_pcm_runtime *runtime = substream->runtime;
1793 switch (runtime->status->state) {
1794 case SNDRV_PCM_STATE_RUNNING:
1795 case SNDRV_PCM_STATE_PREPARED:
1796 case SNDRV_PCM_STATE_PAUSED:
1797 case SNDRV_PCM_STATE_SUSPENDED:
1798 return 0;
1799 default:
1800 return -EBADFD;
1801 }
1802}
1803
1804static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1805 snd_pcm_state_t state)
1806{
1807 struct snd_pcm_runtime *runtime = substream->runtime;
1808 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1809 if (err < 0)
1810 return err;
1811 runtime->hw_ptr_base = 0;
1812 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1813 runtime->status->hw_ptr % runtime->period_size;
1814 runtime->silence_start = runtime->status->hw_ptr;
1815 runtime->silence_filled = 0;
1816 return 0;
1817}
1818
1819static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1820 snd_pcm_state_t state)
1821{
1822 struct snd_pcm_runtime *runtime = substream->runtime;
1823 runtime->control->appl_ptr = runtime->status->hw_ptr;
1824 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1825 runtime->silence_size > 0)
1826 snd_pcm_playback_silence(substream, ULONG_MAX);
1827}
1828
1829static const struct action_ops snd_pcm_action_reset = {
1830 .pre_action = snd_pcm_pre_reset,
1831 .do_action = snd_pcm_do_reset,
1832 .post_action = snd_pcm_post_reset
1833};
1834
1835static int snd_pcm_reset(struct snd_pcm_substream *substream)
1836{
1837 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1838 ACTION_ARG_IGNORE);
1839}
1840
1841/*
1842 * prepare ioctl
1843 */
1844/* pass f_flags as state argument */
1845static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1846 snd_pcm_state_t state)
1847{
1848 struct snd_pcm_runtime *runtime = substream->runtime;
1849 int f_flags = (__force int)state;
1850
1851 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1852 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1853 return -EBADFD;
1854 if (snd_pcm_running(substream))
1855 return -EBUSY;
1856 substream->f_flags = f_flags;
1857 return 0;
1858}
1859
1860static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1861 snd_pcm_state_t state)
1862{
1863 int err;
1864 snd_pcm_sync_stop(substream);
1865 err = substream->ops->prepare(substream);
1866 if (err < 0)
1867 return err;
1868 return snd_pcm_do_reset(substream, state);
1869}
1870
1871static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1872 snd_pcm_state_t state)
1873{
1874 struct snd_pcm_runtime *runtime = substream->runtime;
1875 runtime->control->appl_ptr = runtime->status->hw_ptr;
1876 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1877}
1878
1879static const struct action_ops snd_pcm_action_prepare = {
1880 .pre_action = snd_pcm_pre_prepare,
1881 .do_action = snd_pcm_do_prepare,
1882 .post_action = snd_pcm_post_prepare
1883};
1884
1885/**
1886 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1887 * @substream: the PCM substream instance
1888 * @file: file to refer f_flags
1889 *
1890 * Return: Zero if successful, or a negative error code.
1891 */
1892static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1893 struct file *file)
1894{
1895 int f_flags;
1896
1897 if (file)
1898 f_flags = file->f_flags;
1899 else
1900 f_flags = substream->f_flags;
1901
1902 snd_pcm_stream_lock_irq(substream);
1903 switch (substream->runtime->status->state) {
1904 case SNDRV_PCM_STATE_PAUSED:
1905 snd_pcm_pause(substream, false);
1906 fallthrough;
1907 case SNDRV_PCM_STATE_SUSPENDED:
1908 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1909 break;
1910 }
1911 snd_pcm_stream_unlock_irq(substream);
1912
1913 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1914 substream,
1915 (__force snd_pcm_state_t)f_flags);
1916}
1917
1918/*
1919 * drain ioctl
1920 */
1921
1922/* drain init callbacks: state argument ignored */
1923static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
1924 snd_pcm_state_t state)
1925{
1926 struct snd_pcm_runtime *runtime = substream->runtime;
1927 switch (runtime->status->state) {
1928 case SNDRV_PCM_STATE_OPEN:
1929 case SNDRV_PCM_STATE_DISCONNECTED:
1930 case SNDRV_PCM_STATE_SUSPENDED:
1931 return -EBADFD;
1932 }
1933 runtime->trigger_master = substream;
1934 return 0;
1935}
1936
1937static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
1938 snd_pcm_state_t state)
1939{
1940 struct snd_pcm_runtime *runtime = substream->runtime;
1941 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1942 switch (runtime->status->state) {
1943 case SNDRV_PCM_STATE_PREPARED:
1944 /* start playback stream if possible */
1945 if (! snd_pcm_playback_empty(substream)) {
1946 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1947 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1948 } else {
1949 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1950 }
1951 break;
1952 case SNDRV_PCM_STATE_RUNNING:
1953 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1954 break;
1955 case SNDRV_PCM_STATE_XRUN:
1956 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1957 break;
1958 default:
1959 break;
1960 }
1961 } else {
1962 /* stop running stream */
1963 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1964 snd_pcm_state_t new_state;
1965
1966 new_state = snd_pcm_capture_avail(runtime) > 0 ?
1967 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1968 snd_pcm_do_stop(substream, new_state);
1969 snd_pcm_post_stop(substream, new_state);
1970 }
1971 }
1972
1973 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1974 runtime->trigger_master == substream &&
1975 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1976 return substream->ops->trigger(substream,
1977 SNDRV_PCM_TRIGGER_DRAIN);
1978
1979 return 0;
1980}
1981
1982static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
1983 snd_pcm_state_t state)
1984{
1985}
1986
1987static const struct action_ops snd_pcm_action_drain_init = {
1988 .pre_action = snd_pcm_pre_drain_init,
1989 .do_action = snd_pcm_do_drain_init,
1990 .post_action = snd_pcm_post_drain_init
1991};
1992
1993/*
1994 * Drain the stream(s).
1995 * When the substream is linked, sync until the draining of all playback streams
1996 * is finished.
1997 * After this call, all streams are supposed to be either SETUP or DRAINING
1998 * (capture only) state.
1999 */
2000static int snd_pcm_drain(struct snd_pcm_substream *substream,
2001 struct file *file)
2002{
2003 struct snd_card *card;
2004 struct snd_pcm_runtime *runtime;
2005 struct snd_pcm_substream *s;
2006 struct snd_pcm_group *group;
2007 wait_queue_entry_t wait;
2008 int result = 0;
2009 int nonblock = 0;
2010
2011 card = substream->pcm->card;
2012 runtime = substream->runtime;
2013
2014 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2015 return -EBADFD;
2016
2017 if (file) {
2018 if (file->f_flags & O_NONBLOCK)
2019 nonblock = 1;
2020 } else if (substream->f_flags & O_NONBLOCK)
2021 nonblock = 1;
2022
2023 snd_pcm_stream_lock_irq(substream);
2024 /* resume pause */
2025 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
2026 snd_pcm_pause(substream, false);
2027
2028 /* pre-start/stop - all running streams are changed to DRAINING state */
2029 result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2030 ACTION_ARG_IGNORE);
2031 if (result < 0)
2032 goto unlock;
2033 /* in non-blocking, we don't wait in ioctl but let caller poll */
2034 if (nonblock) {
2035 result = -EAGAIN;
2036 goto unlock;
2037 }
2038
2039 for (;;) {
2040 long tout;
2041 struct snd_pcm_runtime *to_check;
2042 if (signal_pending(current)) {
2043 result = -ERESTARTSYS;
2044 break;
2045 }
2046 /* find a substream to drain */
2047 to_check = NULL;
2048 group = snd_pcm_stream_group_ref(substream);
2049 snd_pcm_group_for_each_entry(s, substream) {
2050 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2051 continue;
2052 runtime = s->runtime;
2053 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2054 to_check = runtime;
2055 break;
2056 }
2057 }
2058 snd_pcm_group_unref(group, substream);
2059 if (!to_check)
2060 break; /* all drained */
2061 init_waitqueue_entry(&wait, current);
2062 set_current_state(TASK_INTERRUPTIBLE);
2063 add_wait_queue(&to_check->sleep, &wait);
2064 snd_pcm_stream_unlock_irq(substream);
2065 if (runtime->no_period_wakeup)
2066 tout = MAX_SCHEDULE_TIMEOUT;
2067 else {
2068 tout = 10;
2069 if (runtime->rate) {
2070 long t = runtime->period_size * 2 / runtime->rate;
2071 tout = max(t, tout);
2072 }
2073 tout = msecs_to_jiffies(tout * 1000);
2074 }
2075 tout = schedule_timeout(tout);
2076
2077 snd_pcm_stream_lock_irq(substream);
2078 group = snd_pcm_stream_group_ref(substream);
2079 snd_pcm_group_for_each_entry(s, substream) {
2080 if (s->runtime == to_check) {
2081 remove_wait_queue(&to_check->sleep, &wait);
2082 break;
2083 }
2084 }
2085 snd_pcm_group_unref(group, substream);
2086
2087 if (card->shutdown) {
2088 result = -ENODEV;
2089 break;
2090 }
2091 if (tout == 0) {
2092 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
2093 result = -ESTRPIPE;
2094 else {
2095 dev_dbg(substream->pcm->card->dev,
2096 "playback drain error (DMA or IRQ trouble?)\n");
2097 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2098 result = -EIO;
2099 }
2100 break;
2101 }
2102 }
2103
2104 unlock:
2105 snd_pcm_stream_unlock_irq(substream);
2106
2107 return result;
2108}
2109
2110/*
2111 * drop ioctl
2112 *
2113 * Immediately put all linked substreams into SETUP state.
2114 */
2115static int snd_pcm_drop(struct snd_pcm_substream *substream)
2116{
2117 struct snd_pcm_runtime *runtime;
2118 int result = 0;
2119
2120 if (PCM_RUNTIME_CHECK(substream))
2121 return -ENXIO;
2122 runtime = substream->runtime;
2123
2124 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2125 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
2126 return -EBADFD;
2127
2128 snd_pcm_stream_lock_irq(substream);
2129 /* resume pause */
2130 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
2131 snd_pcm_pause(substream, false);
2132
2133 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2134 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2135 snd_pcm_stream_unlock_irq(substream);
2136
2137 return result;
2138}
2139
2140
2141static bool is_pcm_file(struct file *file)
2142{
2143 struct inode *inode = file_inode(file);
2144 struct snd_pcm *pcm;
2145 unsigned int minor;
2146
2147 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2148 return false;
2149 minor = iminor(inode);
2150 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2151 if (!pcm)
2152 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2153 if (!pcm)
2154 return false;
2155 snd_card_unref(pcm->card);
2156 return true;
2157}
2158
2159/*
2160 * PCM link handling
2161 */
2162static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2163{
2164 int res = 0;
2165 struct snd_pcm_file *pcm_file;
2166 struct snd_pcm_substream *substream1;
2167 struct snd_pcm_group *group, *target_group;
2168 bool nonatomic = substream->pcm->nonatomic;
2169 struct fd f = fdget(fd);
2170
2171 if (!f.file)
2172 return -EBADFD;
2173 if (!is_pcm_file(f.file)) {
2174 res = -EBADFD;
2175 goto _badf;
2176 }
2177 pcm_file = f.file->private_data;
2178 substream1 = pcm_file->substream;
2179
2180 if (substream == substream1) {
2181 res = -EINVAL;
2182 goto _badf;
2183 }
2184
2185 group = kzalloc(sizeof(*group), GFP_KERNEL);
2186 if (!group) {
2187 res = -ENOMEM;
2188 goto _nolock;
2189 }
2190 snd_pcm_group_init(group);
2191
2192 down_write(&snd_pcm_link_rwsem);
2193 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2194 substream->runtime->status->state != substream1->runtime->status->state ||
2195 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2196 res = -EBADFD;
2197 goto _end;
2198 }
2199 if (snd_pcm_stream_linked(substream1)) {
2200 res = -EALREADY;
2201 goto _end;
2202 }
2203
2204 snd_pcm_stream_lock_irq(substream);
2205 if (!snd_pcm_stream_linked(substream)) {
2206 snd_pcm_group_assign(substream, group);
2207 group = NULL; /* assigned, don't free this one below */
2208 }
2209 target_group = substream->group;
2210 snd_pcm_stream_unlock_irq(substream);
2211
2212 snd_pcm_group_lock_irq(target_group, nonatomic);
2213 snd_pcm_stream_lock_nested(substream1);
2214 snd_pcm_group_assign(substream1, target_group);
2215 refcount_inc(&target_group->refs);
2216 snd_pcm_stream_unlock(substream1);
2217 snd_pcm_group_unlock_irq(target_group, nonatomic);
2218 _end:
2219 up_write(&snd_pcm_link_rwsem);
2220 _nolock:
2221 kfree(group);
2222 _badf:
2223 fdput(f);
2224 return res;
2225}
2226
2227static void relink_to_local(struct snd_pcm_substream *substream)
2228{
2229 snd_pcm_stream_lock_nested(substream);
2230 snd_pcm_group_assign(substream, &substream->self_group);
2231 snd_pcm_stream_unlock(substream);
2232}
2233
2234static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2235{
2236 struct snd_pcm_group *group;
2237 bool nonatomic = substream->pcm->nonatomic;
2238 bool do_free = false;
2239 int res = 0;
2240
2241 down_write(&snd_pcm_link_rwsem);
2242
2243 if (!snd_pcm_stream_linked(substream)) {
2244 res = -EALREADY;
2245 goto _end;
2246 }
2247
2248 group = substream->group;
2249 snd_pcm_group_lock_irq(group, nonatomic);
2250
2251 relink_to_local(substream);
2252 refcount_dec(&group->refs);
2253
2254 /* detach the last stream, too */
2255 if (list_is_singular(&group->substreams)) {
2256 relink_to_local(list_first_entry(&group->substreams,
2257 struct snd_pcm_substream,
2258 link_list));
2259 do_free = refcount_dec_and_test(&group->refs);
2260 }
2261
2262 snd_pcm_group_unlock_irq(group, nonatomic);
2263 if (do_free)
2264 kfree(group);
2265
2266 _end:
2267 up_write(&snd_pcm_link_rwsem);
2268 return res;
2269}
2270
2271/*
2272 * hw configurator
2273 */
2274static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2275 struct snd_pcm_hw_rule *rule)
2276{
2277 struct snd_interval t;
2278 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2279 hw_param_interval_c(params, rule->deps[1]), &t);
2280 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2281}
2282
2283static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2284 struct snd_pcm_hw_rule *rule)
2285{
2286 struct snd_interval t;
2287 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2288 hw_param_interval_c(params, rule->deps[1]), &t);
2289 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2290}
2291
2292static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2293 struct snd_pcm_hw_rule *rule)
2294{
2295 struct snd_interval t;
2296 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2297 hw_param_interval_c(params, rule->deps[1]),
2298 (unsigned long) rule->private, &t);
2299 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2300}
2301
2302static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2303 struct snd_pcm_hw_rule *rule)
2304{
2305 struct snd_interval t;
2306 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2307 (unsigned long) rule->private,
2308 hw_param_interval_c(params, rule->deps[1]), &t);
2309 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2310}
2311
2312static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2313 struct snd_pcm_hw_rule *rule)
2314{
2315 snd_pcm_format_t k;
2316 const struct snd_interval *i =
2317 hw_param_interval_c(params, rule->deps[0]);
2318 struct snd_mask m;
2319 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2320 snd_mask_any(&m);
2321 pcm_for_each_format(k) {
2322 int bits;
2323 if (!snd_mask_test_format(mask, k))
2324 continue;
2325 bits = snd_pcm_format_physical_width(k);
2326 if (bits <= 0)
2327 continue; /* ignore invalid formats */
2328 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2329 snd_mask_reset(&m, (__force unsigned)k);
2330 }
2331 return snd_mask_refine(mask, &m);
2332}
2333
2334static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2335 struct snd_pcm_hw_rule *rule)
2336{
2337 struct snd_interval t;
2338 snd_pcm_format_t k;
2339
2340 t.min = UINT_MAX;
2341 t.max = 0;
2342 t.openmin = 0;
2343 t.openmax = 0;
2344 pcm_for_each_format(k) {
2345 int bits;
2346 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2347 continue;
2348 bits = snd_pcm_format_physical_width(k);
2349 if (bits <= 0)
2350 continue; /* ignore invalid formats */
2351 if (t.min > (unsigned)bits)
2352 t.min = bits;
2353 if (t.max < (unsigned)bits)
2354 t.max = bits;
2355 }
2356 t.integer = 1;
2357 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2358}
2359
2360#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2361#error "Change this table"
2362#endif
2363
2364static const unsigned int rates[] = {
2365 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2366 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2367};
2368
2369const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2370 .count = ARRAY_SIZE(rates),
2371 .list = rates,
2372};
2373
2374static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2375 struct snd_pcm_hw_rule *rule)
2376{
2377 struct snd_pcm_hardware *hw = rule->private;
2378 return snd_interval_list(hw_param_interval(params, rule->var),
2379 snd_pcm_known_rates.count,
2380 snd_pcm_known_rates.list, hw->rates);
2381}
2382
2383static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2384 struct snd_pcm_hw_rule *rule)
2385{
2386 struct snd_interval t;
2387 struct snd_pcm_substream *substream = rule->private;
2388 t.min = 0;
2389 t.max = substream->buffer_bytes_max;
2390 t.openmin = 0;
2391 t.openmax = 0;
2392 t.integer = 1;
2393 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2394}
2395
2396static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2397{
2398 struct snd_pcm_runtime *runtime = substream->runtime;
2399 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2400 int k, err;
2401
2402 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2403 snd_mask_any(constrs_mask(constrs, k));
2404 }
2405
2406 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2407 snd_interval_any(constrs_interval(constrs, k));
2408 }
2409
2410 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2411 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2412 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2413 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2414 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2415
2416 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2417 snd_pcm_hw_rule_format, NULL,
2418 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2419 if (err < 0)
2420 return err;
2421 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2422 snd_pcm_hw_rule_sample_bits, NULL,
2423 SNDRV_PCM_HW_PARAM_FORMAT,
2424 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2425 if (err < 0)
2426 return err;
2427 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2428 snd_pcm_hw_rule_div, NULL,
2429 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2430 if (err < 0)
2431 return err;
2432 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2433 snd_pcm_hw_rule_mul, NULL,
2434 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2435 if (err < 0)
2436 return err;
2437 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2438 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2439 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2440 if (err < 0)
2441 return err;
2442 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2443 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2444 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2445 if (err < 0)
2446 return err;
2447 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2448 snd_pcm_hw_rule_div, NULL,
2449 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2450 if (err < 0)
2451 return err;
2452 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2453 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2454 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2455 if (err < 0)
2456 return err;
2457 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2458 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2459 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2460 if (err < 0)
2461 return err;
2462 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2463 snd_pcm_hw_rule_div, NULL,
2464 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2465 if (err < 0)
2466 return err;
2467 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2468 snd_pcm_hw_rule_div, NULL,
2469 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2470 if (err < 0)
2471 return err;
2472 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2473 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2474 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2475 if (err < 0)
2476 return err;
2477 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2478 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2479 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2480 if (err < 0)
2481 return err;
2482 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2483 snd_pcm_hw_rule_mul, NULL,
2484 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2485 if (err < 0)
2486 return err;
2487 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2488 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2489 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2490 if (err < 0)
2491 return err;
2492 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2493 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2494 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2495 if (err < 0)
2496 return err;
2497 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2498 snd_pcm_hw_rule_muldivk, (void*) 8,
2499 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2500 if (err < 0)
2501 return err;
2502 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2503 snd_pcm_hw_rule_muldivk, (void*) 8,
2504 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2505 if (err < 0)
2506 return err;
2507 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2508 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2509 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2510 if (err < 0)
2511 return err;
2512 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2513 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2514 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2515 if (err < 0)
2516 return err;
2517 return 0;
2518}
2519
2520static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2521{
2522 struct snd_pcm_runtime *runtime = substream->runtime;
2523 struct snd_pcm_hardware *hw = &runtime->hw;
2524 int err;
2525 unsigned int mask = 0;
2526
2527 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2528 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2529 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2530 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2531 if (hw_support_mmap(substream)) {
2532 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2533 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2534 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2535 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2536 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2537 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2538 }
2539 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2540 if (err < 0)
2541 return err;
2542
2543 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2544 if (err < 0)
2545 return err;
2546
2547 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2548 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2549 if (err < 0)
2550 return err;
2551
2552 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2553 hw->channels_min, hw->channels_max);
2554 if (err < 0)
2555 return err;
2556
2557 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2558 hw->rate_min, hw->rate_max);
2559 if (err < 0)
2560 return err;
2561
2562 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2563 hw->period_bytes_min, hw->period_bytes_max);
2564 if (err < 0)
2565 return err;
2566
2567 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2568 hw->periods_min, hw->periods_max);
2569 if (err < 0)
2570 return err;
2571
2572 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2573 hw->period_bytes_min, hw->buffer_bytes_max);
2574 if (err < 0)
2575 return err;
2576
2577 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2578 snd_pcm_hw_rule_buffer_bytes_max, substream,
2579 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2580 if (err < 0)
2581 return err;
2582
2583 /* FIXME: remove */
2584 if (runtime->dma_bytes) {
2585 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2586 if (err < 0)
2587 return err;
2588 }
2589
2590 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2591 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2592 snd_pcm_hw_rule_rate, hw,
2593 SNDRV_PCM_HW_PARAM_RATE, -1);
2594 if (err < 0)
2595 return err;
2596 }
2597
2598 /* FIXME: this belong to lowlevel */
2599 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2600
2601 return 0;
2602}
2603
2604static void pcm_release_private(struct snd_pcm_substream *substream)
2605{
2606 if (snd_pcm_stream_linked(substream))
2607 snd_pcm_unlink(substream);
2608}
2609
2610void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2611{
2612 substream->ref_count--;
2613 if (substream->ref_count > 0)
2614 return;
2615
2616 snd_pcm_drop(substream);
2617 if (substream->hw_opened) {
2618 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2619 do_hw_free(substream);
2620 substream->ops->close(substream);
2621 substream->hw_opened = 0;
2622 }
2623 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2624 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2625 if (substream->pcm_release) {
2626 substream->pcm_release(substream);
2627 substream->pcm_release = NULL;
2628 }
2629 snd_pcm_detach_substream(substream);
2630}
2631EXPORT_SYMBOL(snd_pcm_release_substream);
2632
2633int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2634 struct file *file,
2635 struct snd_pcm_substream **rsubstream)
2636{
2637 struct snd_pcm_substream *substream;
2638 int err;
2639
2640 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2641 if (err < 0)
2642 return err;
2643 if (substream->ref_count > 1) {
2644 *rsubstream = substream;
2645 return 0;
2646 }
2647
2648 err = snd_pcm_hw_constraints_init(substream);
2649 if (err < 0) {
2650 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2651 goto error;
2652 }
2653
2654 if ((err = substream->ops->open(substream)) < 0)
2655 goto error;
2656
2657 substream->hw_opened = 1;
2658
2659 err = snd_pcm_hw_constraints_complete(substream);
2660 if (err < 0) {
2661 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2662 goto error;
2663 }
2664
2665 *rsubstream = substream;
2666 return 0;
2667
2668 error:
2669 snd_pcm_release_substream(substream);
2670 return err;
2671}
2672EXPORT_SYMBOL(snd_pcm_open_substream);
2673
2674static int snd_pcm_open_file(struct file *file,
2675 struct snd_pcm *pcm,
2676 int stream)
2677{
2678 struct snd_pcm_file *pcm_file;
2679 struct snd_pcm_substream *substream;
2680 int err;
2681
2682 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2683 if (err < 0)
2684 return err;
2685
2686 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2687 if (pcm_file == NULL) {
2688 snd_pcm_release_substream(substream);
2689 return -ENOMEM;
2690 }
2691 pcm_file->substream = substream;
2692 if (substream->ref_count == 1)
2693 substream->pcm_release = pcm_release_private;
2694 file->private_data = pcm_file;
2695
2696 return 0;
2697}
2698
2699static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2700{
2701 struct snd_pcm *pcm;
2702 int err = nonseekable_open(inode, file);
2703 if (err < 0)
2704 return err;
2705 pcm = snd_lookup_minor_data(iminor(inode),
2706 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2707 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2708 if (pcm)
2709 snd_card_unref(pcm->card);
2710 return err;
2711}
2712
2713static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2714{
2715 struct snd_pcm *pcm;
2716 int err = nonseekable_open(inode, file);
2717 if (err < 0)
2718 return err;
2719 pcm = snd_lookup_minor_data(iminor(inode),
2720 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2721 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2722 if (pcm)
2723 snd_card_unref(pcm->card);
2724 return err;
2725}
2726
2727static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2728{
2729 int err;
2730 wait_queue_entry_t wait;
2731
2732 if (pcm == NULL) {
2733 err = -ENODEV;
2734 goto __error1;
2735 }
2736 err = snd_card_file_add(pcm->card, file);
2737 if (err < 0)
2738 goto __error1;
2739 if (!try_module_get(pcm->card->module)) {
2740 err = -EFAULT;
2741 goto __error2;
2742 }
2743 init_waitqueue_entry(&wait, current);
2744 add_wait_queue(&pcm->open_wait, &wait);
2745 mutex_lock(&pcm->open_mutex);
2746 while (1) {
2747 err = snd_pcm_open_file(file, pcm, stream);
2748 if (err >= 0)
2749 break;
2750 if (err == -EAGAIN) {
2751 if (file->f_flags & O_NONBLOCK) {
2752 err = -EBUSY;
2753 break;
2754 }
2755 } else
2756 break;
2757 set_current_state(TASK_INTERRUPTIBLE);
2758 mutex_unlock(&pcm->open_mutex);
2759 schedule();
2760 mutex_lock(&pcm->open_mutex);
2761 if (pcm->card->shutdown) {
2762 err = -ENODEV;
2763 break;
2764 }
2765 if (signal_pending(current)) {
2766 err = -ERESTARTSYS;
2767 break;
2768 }
2769 }
2770 remove_wait_queue(&pcm->open_wait, &wait);
2771 mutex_unlock(&pcm->open_mutex);
2772 if (err < 0)
2773 goto __error;
2774 return err;
2775
2776 __error:
2777 module_put(pcm->card->module);
2778 __error2:
2779 snd_card_file_remove(pcm->card, file);
2780 __error1:
2781 return err;
2782}
2783
2784static int snd_pcm_release(struct inode *inode, struct file *file)
2785{
2786 struct snd_pcm *pcm;
2787 struct snd_pcm_substream *substream;
2788 struct snd_pcm_file *pcm_file;
2789
2790 pcm_file = file->private_data;
2791 substream = pcm_file->substream;
2792 if (snd_BUG_ON(!substream))
2793 return -ENXIO;
2794 pcm = substream->pcm;
2795 mutex_lock(&pcm->open_mutex);
2796 snd_pcm_release_substream(substream);
2797 kfree(pcm_file);
2798 mutex_unlock(&pcm->open_mutex);
2799 wake_up(&pcm->open_wait);
2800 module_put(pcm->card->module);
2801 snd_card_file_remove(pcm->card, file);
2802 return 0;
2803}
2804
2805/* check and update PCM state; return 0 or a negative error
2806 * call this inside PCM lock
2807 */
2808static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2809{
2810 switch (substream->runtime->status->state) {
2811 case SNDRV_PCM_STATE_DRAINING:
2812 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2813 return -EBADFD;
2814 fallthrough;
2815 case SNDRV_PCM_STATE_RUNNING:
2816 return snd_pcm_update_hw_ptr(substream);
2817 case SNDRV_PCM_STATE_PREPARED:
2818 case SNDRV_PCM_STATE_PAUSED:
2819 return 0;
2820 case SNDRV_PCM_STATE_SUSPENDED:
2821 return -ESTRPIPE;
2822 case SNDRV_PCM_STATE_XRUN:
2823 return -EPIPE;
2824 default:
2825 return -EBADFD;
2826 }
2827}
2828
2829/* increase the appl_ptr; returns the processed frames or a negative error */
2830static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2831 snd_pcm_uframes_t frames,
2832 snd_pcm_sframes_t avail)
2833{
2834 struct snd_pcm_runtime *runtime = substream->runtime;
2835 snd_pcm_sframes_t appl_ptr;
2836 int ret;
2837
2838 if (avail <= 0)
2839 return 0;
2840 if (frames > (snd_pcm_uframes_t)avail)
2841 frames = avail;
2842 appl_ptr = runtime->control->appl_ptr + frames;
2843 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2844 appl_ptr -= runtime->boundary;
2845 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2846 return ret < 0 ? ret : frames;
2847}
2848
2849/* decrease the appl_ptr; returns the processed frames or zero for error */
2850static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2851 snd_pcm_uframes_t frames,
2852 snd_pcm_sframes_t avail)
2853{
2854 struct snd_pcm_runtime *runtime = substream->runtime;
2855 snd_pcm_sframes_t appl_ptr;
2856 int ret;
2857
2858 if (avail <= 0)
2859 return 0;
2860 if (frames > (snd_pcm_uframes_t)avail)
2861 frames = avail;
2862 appl_ptr = runtime->control->appl_ptr - frames;
2863 if (appl_ptr < 0)
2864 appl_ptr += runtime->boundary;
2865 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2866 /* NOTE: we return zero for errors because PulseAudio gets depressed
2867 * upon receiving an error from rewind ioctl and stops processing
2868 * any longer. Returning zero means that no rewind is done, so
2869 * it's not absolutely wrong to answer like that.
2870 */
2871 return ret < 0 ? 0 : frames;
2872}
2873
2874static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2875 snd_pcm_uframes_t frames)
2876{
2877 snd_pcm_sframes_t ret;
2878
2879 if (frames == 0)
2880 return 0;
2881
2882 snd_pcm_stream_lock_irq(substream);
2883 ret = do_pcm_hwsync(substream);
2884 if (!ret)
2885 ret = rewind_appl_ptr(substream, frames,
2886 snd_pcm_hw_avail(substream));
2887 snd_pcm_stream_unlock_irq(substream);
2888 return ret;
2889}
2890
2891static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2892 snd_pcm_uframes_t frames)
2893{
2894 snd_pcm_sframes_t ret;
2895
2896 if (frames == 0)
2897 return 0;
2898
2899 snd_pcm_stream_lock_irq(substream);
2900 ret = do_pcm_hwsync(substream);
2901 if (!ret)
2902 ret = forward_appl_ptr(substream, frames,
2903 snd_pcm_avail(substream));
2904 snd_pcm_stream_unlock_irq(substream);
2905 return ret;
2906}
2907
2908static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2909{
2910 int err;
2911
2912 snd_pcm_stream_lock_irq(substream);
2913 err = do_pcm_hwsync(substream);
2914 snd_pcm_stream_unlock_irq(substream);
2915 return err;
2916}
2917
2918static int snd_pcm_delay(struct snd_pcm_substream *substream,
2919 snd_pcm_sframes_t *delay)
2920{
2921 int err;
2922 snd_pcm_sframes_t n = 0;
2923
2924 snd_pcm_stream_lock_irq(substream);
2925 err = do_pcm_hwsync(substream);
2926 if (!err)
2927 n = snd_pcm_calc_delay(substream);
2928 snd_pcm_stream_unlock_irq(substream);
2929 if (!err)
2930 *delay = n;
2931 return err;
2932}
2933
2934static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2935 struct snd_pcm_sync_ptr __user *_sync_ptr)
2936{
2937 struct snd_pcm_runtime *runtime = substream->runtime;
2938 struct snd_pcm_sync_ptr sync_ptr;
2939 volatile struct snd_pcm_mmap_status *status;
2940 volatile struct snd_pcm_mmap_control *control;
2941 int err;
2942
2943 memset(&sync_ptr, 0, sizeof(sync_ptr));
2944 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2945 return -EFAULT;
2946 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2947 return -EFAULT;
2948 status = runtime->status;
2949 control = runtime->control;
2950 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2951 err = snd_pcm_hwsync(substream);
2952 if (err < 0)
2953 return err;
2954 }
2955 snd_pcm_stream_lock_irq(substream);
2956 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2957 err = pcm_lib_apply_appl_ptr(substream,
2958 sync_ptr.c.control.appl_ptr);
2959 if (err < 0) {
2960 snd_pcm_stream_unlock_irq(substream);
2961 return err;
2962 }
2963 } else {
2964 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2965 }
2966 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2967 control->avail_min = sync_ptr.c.control.avail_min;
2968 else
2969 sync_ptr.c.control.avail_min = control->avail_min;
2970 sync_ptr.s.status.state = status->state;
2971 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2972 sync_ptr.s.status.tstamp = status->tstamp;
2973 sync_ptr.s.status.suspended_state = status->suspended_state;
2974 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2975 snd_pcm_stream_unlock_irq(substream);
2976 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2977 return -EFAULT;
2978 return 0;
2979}
2980
2981struct snd_pcm_mmap_status32 {
2982 snd_pcm_state_t state;
2983 s32 pad1;
2984 u32 hw_ptr;
2985 s32 tstamp_sec;
2986 s32 tstamp_nsec;
2987 snd_pcm_state_t suspended_state;
2988 s32 audio_tstamp_sec;
2989 s32 audio_tstamp_nsec;
2990} __attribute__((packed));
2991
2992struct snd_pcm_mmap_control32 {
2993 u32 appl_ptr;
2994 u32 avail_min;
2995};
2996
2997struct snd_pcm_sync_ptr32 {
2998 u32 flags;
2999 union {
3000 struct snd_pcm_mmap_status32 status;
3001 unsigned char reserved[64];
3002 } s;
3003 union {
3004 struct snd_pcm_mmap_control32 control;
3005 unsigned char reserved[64];
3006 } c;
3007} __attribute__((packed));
3008
3009/* recalcuate the boundary within 32bit */
3010static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3011{
3012 snd_pcm_uframes_t boundary;
3013
3014 if (! runtime->buffer_size)
3015 return 0;
3016 boundary = runtime->buffer_size;
3017 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3018 boundary *= 2;
3019 return boundary;
3020}
3021
3022static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3023 struct snd_pcm_sync_ptr32 __user *src)
3024{
3025 struct snd_pcm_runtime *runtime = substream->runtime;
3026 volatile struct snd_pcm_mmap_status *status;
3027 volatile struct snd_pcm_mmap_control *control;
3028 u32 sflags;
3029 struct snd_pcm_mmap_control scontrol;
3030 struct snd_pcm_mmap_status sstatus;
3031 snd_pcm_uframes_t boundary;
3032 int err;
3033
3034 if (snd_BUG_ON(!runtime))
3035 return -EINVAL;
3036
3037 if (get_user(sflags, &src->flags) ||
3038 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3039 get_user(scontrol.avail_min, &src->c.control.avail_min))
3040 return -EFAULT;
3041 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3042 err = snd_pcm_hwsync(substream);
3043 if (err < 0)
3044 return err;
3045 }
3046 status = runtime->status;
3047 control = runtime->control;
3048 boundary = recalculate_boundary(runtime);
3049 if (! boundary)
3050 boundary = 0x7fffffff;
3051 snd_pcm_stream_lock_irq(substream);
3052 /* FIXME: we should consider the boundary for the sync from app */
3053 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3054 control->appl_ptr = scontrol.appl_ptr;
3055 else
3056 scontrol.appl_ptr = control->appl_ptr % boundary;
3057 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3058 control->avail_min = scontrol.avail_min;
3059 else
3060 scontrol.avail_min = control->avail_min;
3061 sstatus.state = status->state;
3062 sstatus.hw_ptr = status->hw_ptr % boundary;
3063 sstatus.tstamp = status->tstamp;
3064 sstatus.suspended_state = status->suspended_state;
3065 sstatus.audio_tstamp = status->audio_tstamp;
3066 snd_pcm_stream_unlock_irq(substream);
3067 if (put_user(sstatus.state, &src->s.status.state) ||
3068 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3069 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3070 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3071 put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3072 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3073 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3074 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3075 put_user(scontrol.avail_min, &src->c.control.avail_min))
3076 return -EFAULT;
3077
3078 return 0;
3079}
3080#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3081
3082static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3083{
3084 struct snd_pcm_runtime *runtime = substream->runtime;
3085 int arg;
3086
3087 if (get_user(arg, _arg))
3088 return -EFAULT;
3089 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3090 return -EINVAL;
3091 runtime->tstamp_type = arg;
3092 return 0;
3093}
3094
3095static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3096 struct snd_xferi __user *_xferi)
3097{
3098 struct snd_xferi xferi;
3099 struct snd_pcm_runtime *runtime = substream->runtime;
3100 snd_pcm_sframes_t result;
3101
3102 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3103 return -EBADFD;
3104 if (put_user(0, &_xferi->result))
3105 return -EFAULT;
3106 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3107 return -EFAULT;
3108 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3109 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3110 else
3111 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3112 if (put_user(result, &_xferi->result))
3113 return -EFAULT;
3114 return result < 0 ? result : 0;
3115}
3116
3117static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3118 struct snd_xfern __user *_xfern)
3119{
3120 struct snd_xfern xfern;
3121 struct snd_pcm_runtime *runtime = substream->runtime;
3122 void *bufs;
3123 snd_pcm_sframes_t result;
3124
3125 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3126 return -EBADFD;
3127 if (runtime->channels > 128)
3128 return -EINVAL;
3129 if (put_user(0, &_xfern->result))
3130 return -EFAULT;
3131 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3132 return -EFAULT;
3133
3134 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3135 if (IS_ERR(bufs))
3136 return PTR_ERR(bufs);
3137 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3138 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3139 else
3140 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3141 kfree(bufs);
3142 if (put_user(result, &_xfern->result))
3143 return -EFAULT;
3144 return result < 0 ? result : 0;
3145}
3146
3147static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3148 snd_pcm_uframes_t __user *_frames)
3149{
3150 snd_pcm_uframes_t frames;
3151 snd_pcm_sframes_t result;
3152
3153 if (get_user(frames, _frames))
3154 return -EFAULT;
3155 if (put_user(0, _frames))
3156 return -EFAULT;
3157 result = snd_pcm_rewind(substream, frames);
3158 if (put_user(result, _frames))
3159 return -EFAULT;
3160 return result < 0 ? result : 0;
3161}
3162
3163static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3164 snd_pcm_uframes_t __user *_frames)
3165{
3166 snd_pcm_uframes_t frames;
3167 snd_pcm_sframes_t result;
3168
3169 if (get_user(frames, _frames))
3170 return -EFAULT;
3171 if (put_user(0, _frames))
3172 return -EFAULT;
3173 result = snd_pcm_forward(substream, frames);
3174 if (put_user(result, _frames))
3175 return -EFAULT;
3176 return result < 0 ? result : 0;
3177}
3178
3179static int snd_pcm_common_ioctl(struct file *file,
3180 struct snd_pcm_substream *substream,
3181 unsigned int cmd, void __user *arg)
3182{
3183 struct snd_pcm_file *pcm_file = file->private_data;
3184 int res;
3185
3186 if (PCM_RUNTIME_CHECK(substream))
3187 return -ENXIO;
3188
3189 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
3190 if (res < 0)
3191 return res;
3192
3193 switch (cmd) {
3194 case SNDRV_PCM_IOCTL_PVERSION:
3195 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3196 case SNDRV_PCM_IOCTL_INFO:
3197 return snd_pcm_info_user(substream, arg);
3198 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
3199 return 0;
3200 case SNDRV_PCM_IOCTL_TTSTAMP:
3201 return snd_pcm_tstamp(substream, arg);
3202 case SNDRV_PCM_IOCTL_USER_PVERSION:
3203 if (get_user(pcm_file->user_pversion,
3204 (unsigned int __user *)arg))
3205 return -EFAULT;
3206 return 0;
3207 case SNDRV_PCM_IOCTL_HW_REFINE:
3208 return snd_pcm_hw_refine_user(substream, arg);
3209 case SNDRV_PCM_IOCTL_HW_PARAMS:
3210 return snd_pcm_hw_params_user(substream, arg);
3211 case SNDRV_PCM_IOCTL_HW_FREE:
3212 return snd_pcm_hw_free(substream);
3213 case SNDRV_PCM_IOCTL_SW_PARAMS:
3214 return snd_pcm_sw_params_user(substream, arg);
3215 case SNDRV_PCM_IOCTL_STATUS32:
3216 return snd_pcm_status_user32(substream, arg, false);
3217 case SNDRV_PCM_IOCTL_STATUS_EXT32:
3218 return snd_pcm_status_user32(substream, arg, true);
3219 case SNDRV_PCM_IOCTL_STATUS64:
3220 return snd_pcm_status_user64(substream, arg, false);
3221 case SNDRV_PCM_IOCTL_STATUS_EXT64:
3222 return snd_pcm_status_user64(substream, arg, true);
3223 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3224 return snd_pcm_channel_info_user(substream, arg);
3225 case SNDRV_PCM_IOCTL_PREPARE:
3226 return snd_pcm_prepare(substream, file);
3227 case SNDRV_PCM_IOCTL_RESET:
3228 return snd_pcm_reset(substream);
3229 case SNDRV_PCM_IOCTL_START:
3230 return snd_pcm_start_lock_irq(substream);
3231 case SNDRV_PCM_IOCTL_LINK:
3232 return snd_pcm_link(substream, (int)(unsigned long) arg);
3233 case SNDRV_PCM_IOCTL_UNLINK:
3234 return snd_pcm_unlink(substream);
3235 case SNDRV_PCM_IOCTL_RESUME:
3236 return snd_pcm_resume(substream);
3237 case SNDRV_PCM_IOCTL_XRUN:
3238 return snd_pcm_xrun(substream);
3239 case SNDRV_PCM_IOCTL_HWSYNC:
3240 return snd_pcm_hwsync(substream);
3241 case SNDRV_PCM_IOCTL_DELAY:
3242 {
3243 snd_pcm_sframes_t delay;
3244 snd_pcm_sframes_t __user *res = arg;
3245 int err;
3246
3247 err = snd_pcm_delay(substream, &delay);
3248 if (err)
3249 return err;
3250 if (put_user(delay, res))
3251 return -EFAULT;
3252 return 0;
3253 }
3254 case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3255 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3256 case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3257 return snd_pcm_sync_ptr(substream, arg);
3258#ifdef CONFIG_SND_SUPPORT_OLD_API
3259 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3260 return snd_pcm_hw_refine_old_user(substream, arg);
3261 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3262 return snd_pcm_hw_params_old_user(substream, arg);
3263#endif
3264 case SNDRV_PCM_IOCTL_DRAIN:
3265 return snd_pcm_drain(substream, file);
3266 case SNDRV_PCM_IOCTL_DROP:
3267 return snd_pcm_drop(substream);
3268 case SNDRV_PCM_IOCTL_PAUSE:
3269 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3270 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3271 case SNDRV_PCM_IOCTL_READI_FRAMES:
3272 return snd_pcm_xferi_frames_ioctl(substream, arg);
3273 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3274 case SNDRV_PCM_IOCTL_READN_FRAMES:
3275 return snd_pcm_xfern_frames_ioctl(substream, arg);
3276 case SNDRV_PCM_IOCTL_REWIND:
3277 return snd_pcm_rewind_ioctl(substream, arg);
3278 case SNDRV_PCM_IOCTL_FORWARD:
3279 return snd_pcm_forward_ioctl(substream, arg);
3280 }
3281 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3282 return -ENOTTY;
3283}
3284
3285static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3286 unsigned long arg)
3287{
3288 struct snd_pcm_file *pcm_file;
3289
3290 pcm_file = file->private_data;
3291
3292 if (((cmd >> 8) & 0xff) != 'A')
3293 return -ENOTTY;
3294
3295 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3296 (void __user *)arg);
3297}
3298
3299/**
3300 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3301 * @substream: PCM substream
3302 * @cmd: IOCTL cmd
3303 * @arg: IOCTL argument
3304 *
3305 * The function is provided primarily for OSS layer and USB gadget drivers,
3306 * and it allows only the limited set of ioctls (hw_params, sw_params,
3307 * prepare, start, drain, drop, forward).
3308 */
3309int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3310 unsigned int cmd, void *arg)
3311{
3312 snd_pcm_uframes_t *frames = arg;
3313 snd_pcm_sframes_t result;
3314
3315 switch (cmd) {
3316 case SNDRV_PCM_IOCTL_FORWARD:
3317 {
3318 /* provided only for OSS; capture-only and no value returned */
3319 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3320 return -EINVAL;
3321 result = snd_pcm_forward(substream, *frames);
3322 return result < 0 ? result : 0;
3323 }
3324 case SNDRV_PCM_IOCTL_HW_PARAMS:
3325 return snd_pcm_hw_params(substream, arg);
3326 case SNDRV_PCM_IOCTL_SW_PARAMS:
3327 return snd_pcm_sw_params(substream, arg);
3328 case SNDRV_PCM_IOCTL_PREPARE:
3329 return snd_pcm_prepare(substream, NULL);
3330 case SNDRV_PCM_IOCTL_START:
3331 return snd_pcm_start_lock_irq(substream);
3332 case SNDRV_PCM_IOCTL_DRAIN:
3333 return snd_pcm_drain(substream, NULL);
3334 case SNDRV_PCM_IOCTL_DROP:
3335 return snd_pcm_drop(substream);
3336 case SNDRV_PCM_IOCTL_DELAY:
3337 return snd_pcm_delay(substream, frames);
3338 default:
3339 return -EINVAL;
3340 }
3341}
3342EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3343
3344static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3345 loff_t * offset)
3346{
3347 struct snd_pcm_file *pcm_file;
3348 struct snd_pcm_substream *substream;
3349 struct snd_pcm_runtime *runtime;
3350 snd_pcm_sframes_t result;
3351
3352 pcm_file = file->private_data;
3353 substream = pcm_file->substream;
3354 if (PCM_RUNTIME_CHECK(substream))
3355 return -ENXIO;
3356 runtime = substream->runtime;
3357 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3358 return -EBADFD;
3359 if (!frame_aligned(runtime, count))
3360 return -EINVAL;
3361 count = bytes_to_frames(runtime, count);
3362 result = snd_pcm_lib_read(substream, buf, count);
3363 if (result > 0)
3364 result = frames_to_bytes(runtime, result);
3365 return result;
3366}
3367
3368static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3369 size_t count, loff_t * offset)
3370{
3371 struct snd_pcm_file *pcm_file;
3372 struct snd_pcm_substream *substream;
3373 struct snd_pcm_runtime *runtime;
3374 snd_pcm_sframes_t result;
3375
3376 pcm_file = file->private_data;
3377 substream = pcm_file->substream;
3378 if (PCM_RUNTIME_CHECK(substream))
3379 return -ENXIO;
3380 runtime = substream->runtime;
3381 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3382 return -EBADFD;
3383 if (!frame_aligned(runtime, count))
3384 return -EINVAL;
3385 count = bytes_to_frames(runtime, count);
3386 result = snd_pcm_lib_write(substream, buf, count);
3387 if (result > 0)
3388 result = frames_to_bytes(runtime, result);
3389 return result;
3390}
3391
3392static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3393{
3394 struct snd_pcm_file *pcm_file;
3395 struct snd_pcm_substream *substream;
3396 struct snd_pcm_runtime *runtime;
3397 snd_pcm_sframes_t result;
3398 unsigned long i;
3399 void __user **bufs;
3400 snd_pcm_uframes_t frames;
3401
3402 pcm_file = iocb->ki_filp->private_data;
3403 substream = pcm_file->substream;
3404 if (PCM_RUNTIME_CHECK(substream))
3405 return -ENXIO;
3406 runtime = substream->runtime;
3407 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3408 return -EBADFD;
3409 if (!iter_is_iovec(to))
3410 return -EINVAL;
3411 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3412 return -EINVAL;
3413 if (!frame_aligned(runtime, to->iov->iov_len))
3414 return -EINVAL;
3415 frames = bytes_to_samples(runtime, to->iov->iov_len);
3416 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3417 if (bufs == NULL)
3418 return -ENOMEM;
3419 for (i = 0; i < to->nr_segs; ++i)
3420 bufs[i] = to->iov[i].iov_base;
3421 result = snd_pcm_lib_readv(substream, bufs, frames);
3422 if (result > 0)
3423 result = frames_to_bytes(runtime, result);
3424 kfree(bufs);
3425 return result;
3426}
3427
3428static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3429{
3430 struct snd_pcm_file *pcm_file;
3431 struct snd_pcm_substream *substream;
3432 struct snd_pcm_runtime *runtime;
3433 snd_pcm_sframes_t result;
3434 unsigned long i;
3435 void __user **bufs;
3436 snd_pcm_uframes_t frames;
3437
3438 pcm_file = iocb->ki_filp->private_data;
3439 substream = pcm_file->substream;
3440 if (PCM_RUNTIME_CHECK(substream))
3441 return -ENXIO;
3442 runtime = substream->runtime;
3443 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3444 return -EBADFD;
3445 if (!iter_is_iovec(from))
3446 return -EINVAL;
3447 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3448 !frame_aligned(runtime, from->iov->iov_len))
3449 return -EINVAL;
3450 frames = bytes_to_samples(runtime, from->iov->iov_len);
3451 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3452 if (bufs == NULL)
3453 return -ENOMEM;
3454 for (i = 0; i < from->nr_segs; ++i)
3455 bufs[i] = from->iov[i].iov_base;
3456 result = snd_pcm_lib_writev(substream, bufs, frames);
3457 if (result > 0)
3458 result = frames_to_bytes(runtime, result);
3459 kfree(bufs);
3460 return result;
3461}
3462
3463static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3464{
3465 struct snd_pcm_file *pcm_file;
3466 struct snd_pcm_substream *substream;
3467 struct snd_pcm_runtime *runtime;
3468 __poll_t mask, ok;
3469 snd_pcm_uframes_t avail;
3470
3471 pcm_file = file->private_data;
3472
3473 substream = pcm_file->substream;
3474 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3475 ok = EPOLLOUT | EPOLLWRNORM;
3476 else
3477 ok = EPOLLIN | EPOLLRDNORM;
3478 if (PCM_RUNTIME_CHECK(substream))
3479 return ok | EPOLLERR;
3480
3481 runtime = substream->runtime;
3482 poll_wait(file, &runtime->sleep, wait);
3483
3484 mask = 0;
3485 snd_pcm_stream_lock_irq(substream);
3486 avail = snd_pcm_avail(substream);
3487 switch (runtime->status->state) {
3488 case SNDRV_PCM_STATE_RUNNING:
3489 case SNDRV_PCM_STATE_PREPARED:
3490 case SNDRV_PCM_STATE_PAUSED:
3491 if (avail >= runtime->control->avail_min)
3492 mask = ok;
3493 break;
3494 case SNDRV_PCM_STATE_DRAINING:
3495 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3496 mask = ok;
3497 if (!avail)
3498 mask |= EPOLLERR;
3499 }
3500 break;
3501 default:
3502 mask = ok | EPOLLERR;
3503 break;
3504 }
3505 snd_pcm_stream_unlock_irq(substream);
3506 return mask;
3507}
3508
3509/*
3510 * mmap support
3511 */
3512
3513/*
3514 * Only on coherent architectures, we can mmap the status and the control records
3515 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3516 */
3517#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3518/*
3519 * mmap status record
3520 */
3521static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3522{
3523 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3524 struct snd_pcm_runtime *runtime;
3525
3526 if (substream == NULL)
3527 return VM_FAULT_SIGBUS;
3528 runtime = substream->runtime;
3529 vmf->page = virt_to_page(runtime->status);
3530 get_page(vmf->page);
3531 return 0;
3532}
3533
3534static const struct vm_operations_struct snd_pcm_vm_ops_status =
3535{
3536 .fault = snd_pcm_mmap_status_fault,
3537};
3538
3539static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3540 struct vm_area_struct *area)
3541{
3542 long size;
3543 if (!(area->vm_flags & VM_READ))
3544 return -EINVAL;
3545 size = area->vm_end - area->vm_start;
3546 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3547 return -EINVAL;
3548 area->vm_ops = &snd_pcm_vm_ops_status;
3549 area->vm_private_data = substream;
3550 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3551 return 0;
3552}
3553
3554/*
3555 * mmap control record
3556 */
3557static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3558{
3559 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3560 struct snd_pcm_runtime *runtime;
3561
3562 if (substream == NULL)
3563 return VM_FAULT_SIGBUS;
3564 runtime = substream->runtime;
3565 vmf->page = virt_to_page(runtime->control);
3566 get_page(vmf->page);
3567 return 0;
3568}
3569
3570static const struct vm_operations_struct snd_pcm_vm_ops_control =
3571{
3572 .fault = snd_pcm_mmap_control_fault,
3573};
3574
3575static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3576 struct vm_area_struct *area)
3577{
3578 long size;
3579 if (!(area->vm_flags & VM_READ))
3580 return -EINVAL;
3581 size = area->vm_end - area->vm_start;
3582 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3583 return -EINVAL;
3584 area->vm_ops = &snd_pcm_vm_ops_control;
3585 area->vm_private_data = substream;
3586 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3587 return 0;
3588}
3589
3590static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3591{
3592 /* See pcm_control_mmap_allowed() below.
3593 * Since older alsa-lib requires both status and control mmaps to be
3594 * coupled, we have to disable the status mmap for old alsa-lib, too.
3595 */
3596 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3597 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3598 return false;
3599 return true;
3600}
3601
3602static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3603{
3604 if (pcm_file->no_compat_mmap)
3605 return false;
3606 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3607 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3608 * thus it effectively assures the manual update of appl_ptr.
3609 */
3610 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3611 return false;
3612 return true;
3613}
3614
3615#else /* ! coherent mmap */
3616/*
3617 * don't support mmap for status and control records.
3618 */
3619#define pcm_status_mmap_allowed(pcm_file) false
3620#define pcm_control_mmap_allowed(pcm_file) false
3621
3622static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3623 struct vm_area_struct *area)
3624{
3625 return -ENXIO;
3626}
3627static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3628 struct vm_area_struct *area)
3629{
3630 return -ENXIO;
3631}
3632#endif /* coherent mmap */
3633
3634static inline struct page *
3635snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3636{
3637 void *vaddr = substream->runtime->dma_area + ofs;
3638
3639 switch (substream->dma_buffer.dev.type) {
3640#ifdef CONFIG_SND_DMA_SGBUF
3641 case SNDRV_DMA_TYPE_DEV_SG:
3642 case SNDRV_DMA_TYPE_DEV_UC_SG:
3643 return snd_pcm_sgbuf_ops_page(substream, ofs);
3644#endif /* CONFIG_SND_DMA_SGBUF */
3645 case SNDRV_DMA_TYPE_VMALLOC:
3646 return vmalloc_to_page(vaddr);
3647 default:
3648 return virt_to_page(vaddr);
3649 }
3650}
3651
3652/*
3653 * fault callback for mmapping a RAM page
3654 */
3655static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3656{
3657 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3658 struct snd_pcm_runtime *runtime;
3659 unsigned long offset;
3660 struct page * page;
3661 size_t dma_bytes;
3662
3663 if (substream == NULL)
3664 return VM_FAULT_SIGBUS;
3665 runtime = substream->runtime;
3666 offset = vmf->pgoff << PAGE_SHIFT;
3667 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3668 if (offset > dma_bytes - PAGE_SIZE)
3669 return VM_FAULT_SIGBUS;
3670 if (substream->ops->page)
3671 page = substream->ops->page(substream, offset);
3672 else
3673 page = snd_pcm_default_page_ops(substream, offset);
3674 if (!page)
3675 return VM_FAULT_SIGBUS;
3676 get_page(page);
3677 vmf->page = page;
3678 return 0;
3679}
3680
3681static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3682 .open = snd_pcm_mmap_data_open,
3683 .close = snd_pcm_mmap_data_close,
3684};
3685
3686static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3687 .open = snd_pcm_mmap_data_open,
3688 .close = snd_pcm_mmap_data_close,
3689 .fault = snd_pcm_mmap_data_fault,
3690};
3691
3692/*
3693 * mmap the DMA buffer on RAM
3694 */
3695
3696/**
3697 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3698 * @substream: PCM substream
3699 * @area: VMA
3700 *
3701 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3702 * this function is invoked implicitly.
3703 */
3704int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3705 struct vm_area_struct *area)
3706{
3707 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3708#ifdef CONFIG_GENERIC_ALLOCATOR
3709 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3710 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3711 return remap_pfn_range(area, area->vm_start,
3712 substream->dma_buffer.addr >> PAGE_SHIFT,
3713 area->vm_end - area->vm_start, area->vm_page_prot);
3714 }
3715#endif /* CONFIG_GENERIC_ALLOCATOR */
3716 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3717 (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV ||
3718 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_UC))
3719 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3720 area,
3721 substream->runtime->dma_area,
3722 substream->runtime->dma_addr,
3723 substream->runtime->dma_bytes);
3724 /* mmap with fault handler */
3725 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3726 return 0;
3727}
3728EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3729
3730/*
3731 * mmap the DMA buffer on I/O memory area
3732 */
3733#if SNDRV_PCM_INFO_MMAP_IOMEM
3734/**
3735 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3736 * @substream: PCM substream
3737 * @area: VMA
3738 *
3739 * When your hardware uses the iomapped pages as the hardware buffer and
3740 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3741 * is supposed to work only on limited architectures.
3742 */
3743int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3744 struct vm_area_struct *area)
3745{
3746 struct snd_pcm_runtime *runtime = substream->runtime;
3747
3748 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3749 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3750}
3751EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3752#endif /* SNDRV_PCM_INFO_MMAP */
3753
3754/*
3755 * mmap DMA buffer
3756 */
3757int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3758 struct vm_area_struct *area)
3759{
3760 struct snd_pcm_runtime *runtime;
3761 long size;
3762 unsigned long offset;
3763 size_t dma_bytes;
3764 int err;
3765
3766 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3767 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3768 return -EINVAL;
3769 } else {
3770 if (!(area->vm_flags & VM_READ))
3771 return -EINVAL;
3772 }
3773 runtime = substream->runtime;
3774 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3775 return -EBADFD;
3776 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3777 return -ENXIO;
3778 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3779 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3780 return -EINVAL;
3781 size = area->vm_end - area->vm_start;
3782 offset = area->vm_pgoff << PAGE_SHIFT;
3783 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3784 if ((size_t)size > dma_bytes)
3785 return -EINVAL;
3786 if (offset > dma_bytes - size)
3787 return -EINVAL;
3788
3789 area->vm_ops = &snd_pcm_vm_ops_data;
3790 area->vm_private_data = substream;
3791 if (substream->ops->mmap)
3792 err = substream->ops->mmap(substream, area);
3793 else
3794 err = snd_pcm_lib_default_mmap(substream, area);
3795 if (!err)
3796 atomic_inc(&substream->mmap_count);
3797 return err;
3798}
3799EXPORT_SYMBOL(snd_pcm_mmap_data);
3800
3801static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3802{
3803 struct snd_pcm_file * pcm_file;
3804 struct snd_pcm_substream *substream;
3805 unsigned long offset;
3806
3807 pcm_file = file->private_data;
3808 substream = pcm_file->substream;
3809 if (PCM_RUNTIME_CHECK(substream))
3810 return -ENXIO;
3811
3812 offset = area->vm_pgoff << PAGE_SHIFT;
3813 switch (offset) {
3814 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3815 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3816 return -ENXIO;
3817 fallthrough;
3818 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3819 if (!pcm_status_mmap_allowed(pcm_file))
3820 return -ENXIO;
3821 return snd_pcm_mmap_status(substream, file, area);
3822 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3823 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3824 return -ENXIO;
3825 fallthrough;
3826 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3827 if (!pcm_control_mmap_allowed(pcm_file))
3828 return -ENXIO;
3829 return snd_pcm_mmap_control(substream, file, area);
3830 default:
3831 return snd_pcm_mmap_data(substream, file, area);
3832 }
3833 return 0;
3834}
3835
3836static int snd_pcm_fasync(int fd, struct file * file, int on)
3837{
3838 struct snd_pcm_file * pcm_file;
3839 struct snd_pcm_substream *substream;
3840 struct snd_pcm_runtime *runtime;
3841
3842 pcm_file = file->private_data;
3843 substream = pcm_file->substream;
3844 if (PCM_RUNTIME_CHECK(substream))
3845 return -ENXIO;
3846 runtime = substream->runtime;
3847 return fasync_helper(fd, file, on, &runtime->fasync);
3848}
3849
3850/*
3851 * ioctl32 compat
3852 */
3853#ifdef CONFIG_COMPAT
3854#include "pcm_compat.c"
3855#else
3856#define snd_pcm_ioctl_compat NULL
3857#endif
3858
3859/*
3860 * To be removed helpers to keep binary compatibility
3861 */
3862
3863#ifdef CONFIG_SND_SUPPORT_OLD_API
3864#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3865#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3866
3867static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3868 struct snd_pcm_hw_params_old *oparams)
3869{
3870 unsigned int i;
3871
3872 memset(params, 0, sizeof(*params));
3873 params->flags = oparams->flags;
3874 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3875 params->masks[i].bits[0] = oparams->masks[i];
3876 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3877 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3878 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3879 params->info = oparams->info;
3880 params->msbits = oparams->msbits;
3881 params->rate_num = oparams->rate_num;
3882 params->rate_den = oparams->rate_den;
3883 params->fifo_size = oparams->fifo_size;
3884}
3885
3886static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3887 struct snd_pcm_hw_params *params)
3888{
3889 unsigned int i;
3890
3891 memset(oparams, 0, sizeof(*oparams));
3892 oparams->flags = params->flags;
3893 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3894 oparams->masks[i] = params->masks[i].bits[0];
3895 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3896 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3897 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3898 oparams->info = params->info;
3899 oparams->msbits = params->msbits;
3900 oparams->rate_num = params->rate_num;
3901 oparams->rate_den = params->rate_den;
3902 oparams->fifo_size = params->fifo_size;
3903}
3904
3905static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3906 struct snd_pcm_hw_params_old __user * _oparams)
3907{
3908 struct snd_pcm_hw_params *params;
3909 struct snd_pcm_hw_params_old *oparams = NULL;
3910 int err;
3911
3912 params = kmalloc(sizeof(*params), GFP_KERNEL);
3913 if (!params)
3914 return -ENOMEM;
3915
3916 oparams = memdup_user(_oparams, sizeof(*oparams));
3917 if (IS_ERR(oparams)) {
3918 err = PTR_ERR(oparams);
3919 goto out;
3920 }
3921 snd_pcm_hw_convert_from_old_params(params, oparams);
3922 err = snd_pcm_hw_refine(substream, params);
3923 if (err < 0)
3924 goto out_old;
3925
3926 err = fixup_unreferenced_params(substream, params);
3927 if (err < 0)
3928 goto out_old;
3929
3930 snd_pcm_hw_convert_to_old_params(oparams, params);
3931 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3932 err = -EFAULT;
3933out_old:
3934 kfree(oparams);
3935out:
3936 kfree(params);
3937 return err;
3938}
3939
3940static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3941 struct snd_pcm_hw_params_old __user * _oparams)
3942{
3943 struct snd_pcm_hw_params *params;
3944 struct snd_pcm_hw_params_old *oparams = NULL;
3945 int err;
3946
3947 params = kmalloc(sizeof(*params), GFP_KERNEL);
3948 if (!params)
3949 return -ENOMEM;
3950
3951 oparams = memdup_user(_oparams, sizeof(*oparams));
3952 if (IS_ERR(oparams)) {
3953 err = PTR_ERR(oparams);
3954 goto out;
3955 }
3956
3957 snd_pcm_hw_convert_from_old_params(params, oparams);
3958 err = snd_pcm_hw_params(substream, params);
3959 if (err < 0)
3960 goto out_old;
3961
3962 snd_pcm_hw_convert_to_old_params(oparams, params);
3963 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3964 err = -EFAULT;
3965out_old:
3966 kfree(oparams);
3967out:
3968 kfree(params);
3969 return err;
3970}
3971#endif /* CONFIG_SND_SUPPORT_OLD_API */
3972
3973#ifndef CONFIG_MMU
3974static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3975 unsigned long addr,
3976 unsigned long len,
3977 unsigned long pgoff,
3978 unsigned long flags)
3979{
3980 struct snd_pcm_file *pcm_file = file->private_data;
3981 struct snd_pcm_substream *substream = pcm_file->substream;
3982 struct snd_pcm_runtime *runtime = substream->runtime;
3983 unsigned long offset = pgoff << PAGE_SHIFT;
3984
3985 switch (offset) {
3986 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3987 return (unsigned long)runtime->status;
3988 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3989 return (unsigned long)runtime->control;
3990 default:
3991 return (unsigned long)runtime->dma_area + offset;
3992 }
3993}
3994#else
3995# define snd_pcm_get_unmapped_area NULL
3996#endif
3997
3998/*
3999 * Register section
4000 */
4001
4002const struct file_operations snd_pcm_f_ops[2] = {
4003 {
4004 .owner = THIS_MODULE,
4005 .write = snd_pcm_write,
4006 .write_iter = snd_pcm_writev,
4007 .open = snd_pcm_playback_open,
4008 .release = snd_pcm_release,
4009 .llseek = no_llseek,
4010 .poll = snd_pcm_poll,
4011 .unlocked_ioctl = snd_pcm_ioctl,
4012 .compat_ioctl = snd_pcm_ioctl_compat,
4013 .mmap = snd_pcm_mmap,
4014 .fasync = snd_pcm_fasync,
4015 .get_unmapped_area = snd_pcm_get_unmapped_area,
4016 },
4017 {
4018 .owner = THIS_MODULE,
4019 .read = snd_pcm_read,
4020 .read_iter = snd_pcm_readv,
4021 .open = snd_pcm_capture_open,
4022 .release = snd_pcm_release,
4023 .llseek = no_llseek,
4024 .poll = snd_pcm_poll,
4025 .unlocked_ioctl = snd_pcm_ioctl,
4026 .compat_ioctl = snd_pcm_ioctl_compat,
4027 .mmap = snd_pcm_mmap,
4028 .fasync = snd_pcm_fasync,
4029 .get_unmapped_area = snd_pcm_get_unmapped_area,
4030 }
4031};
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/aio.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 <asm/io.h>
38#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39#include <dma-coherence.h>
40#endif
41
42/*
43 * Compatibility
44 */
45
46struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60};
61
62#ifdef CONFIG_SND_SUPPORT_OLD_API
63#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70#endif
71static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73/*
74 *
75 */
76
77DEFINE_RWLOCK(snd_pcm_link_rwlock);
78EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82static inline mm_segment_t snd_enter_user(void)
83{
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87}
88
89static inline void snd_leave_user(mm_segment_t fs)
90{
91 set_fs(fs);
92}
93
94
95
96int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97{
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121}
122
123int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125{
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139}
140
141#undef RULES_DEBUG
142
143#ifdef RULES_DEBUG
144#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161};
162#endif
163
164int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166{
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192#ifdef RULES_DEBUG
193 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
194 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195#endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197#ifdef RULES_DEBUG
198 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199#endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212#ifdef RULES_DEBUG
213 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 pr_cont("empty");
216 else
217 pr_cont("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 pr_cont(" -> ");
221#endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223#ifdef RULES_DEBUG
224 if (i->empty)
225 pr_cont("empty\n");
226 else
227 pr_cont("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230#endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257#ifdef RULES_DEBUG
258 pr_debug("Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 pr_cont("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 pr_cont("empty");
268 else
269 pr_cont("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274#endif
275 changed = r->func(params, r);
276#ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 pr_cont(" -> ");
279 if (hw_is_mask(r->var))
280 pr_cont("%x", *m->bits);
281 else {
282 if (i->empty)
283 pr_cont("empty");
284 else
285 pr_cont("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 pr_cont("\n");
291#endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333}
334
335EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339{
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355}
356
357static int period_to_usecs(struct snd_pcm_runtime *runtime)
358{
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370}
371
372static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
373{
374 snd_pcm_stream_lock_irq(substream);
375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
376 substream->runtime->status->state = state;
377 snd_pcm_stream_unlock_irq(substream);
378}
379
380static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *params)
382{
383 struct snd_pcm_runtime *runtime;
384 int err, usecs;
385 unsigned int bits;
386 snd_pcm_uframes_t frames;
387
388 if (PCM_RUNTIME_CHECK(substream))
389 return -ENXIO;
390 runtime = substream->runtime;
391 snd_pcm_stream_lock_irq(substream);
392 switch (runtime->status->state) {
393 case SNDRV_PCM_STATE_OPEN:
394 case SNDRV_PCM_STATE_SETUP:
395 case SNDRV_PCM_STATE_PREPARED:
396 break;
397 default:
398 snd_pcm_stream_unlock_irq(substream);
399 return -EBADFD;
400 }
401 snd_pcm_stream_unlock_irq(substream);
402#if IS_ENABLED(CONFIG_SND_PCM_OSS)
403 if (!substream->oss.oss)
404#endif
405 if (atomic_read(&substream->mmap_count))
406 return -EBADFD;
407
408 params->rmask = ~0U;
409 err = snd_pcm_hw_refine(substream, params);
410 if (err < 0)
411 goto _error;
412
413 err = snd_pcm_hw_params_choose(substream, params);
414 if (err < 0)
415 goto _error;
416
417 if (substream->ops->hw_params != NULL) {
418 err = substream->ops->hw_params(substream, params);
419 if (err < 0)
420 goto _error;
421 }
422
423 runtime->access = params_access(params);
424 runtime->format = params_format(params);
425 runtime->subformat = params_subformat(params);
426 runtime->channels = params_channels(params);
427 runtime->rate = params_rate(params);
428 runtime->period_size = params_period_size(params);
429 runtime->periods = params_periods(params);
430 runtime->buffer_size = params_buffer_size(params);
431 runtime->info = params->info;
432 runtime->rate_num = params->rate_num;
433 runtime->rate_den = params->rate_den;
434 runtime->no_period_wakeup =
435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
437
438 bits = snd_pcm_format_physical_width(runtime->format);
439 runtime->sample_bits = bits;
440 bits *= runtime->channels;
441 runtime->frame_bits = bits;
442 frames = 1;
443 while (bits % 8 != 0) {
444 bits *= 2;
445 frames *= 2;
446 }
447 runtime->byte_align = bits / 8;
448 runtime->min_align = frames;
449
450 /* Default sw params */
451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
452 runtime->period_step = 1;
453 runtime->control->avail_min = runtime->period_size;
454 runtime->start_threshold = 1;
455 runtime->stop_threshold = runtime->buffer_size;
456 runtime->silence_threshold = 0;
457 runtime->silence_size = 0;
458 runtime->boundary = runtime->buffer_size;
459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
460 runtime->boundary *= 2;
461
462 snd_pcm_timer_resolution_change(substream);
463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
464
465 if (pm_qos_request_active(&substream->latency_pm_qos_req))
466 pm_qos_remove_request(&substream->latency_pm_qos_req);
467 if ((usecs = period_to_usecs(runtime)) >= 0)
468 pm_qos_add_request(&substream->latency_pm_qos_req,
469 PM_QOS_CPU_DMA_LATENCY, usecs);
470 return 0;
471 _error:
472 /* hardware might be unusable from this time,
473 so we force application to retry to set
474 the correct hardware parameter settings */
475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
476 if (substream->ops->hw_free != NULL)
477 substream->ops->hw_free(substream);
478 return err;
479}
480
481static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params __user * _params)
483{
484 struct snd_pcm_hw_params *params;
485 int err;
486
487 params = memdup_user(_params, sizeof(*params));
488 if (IS_ERR(params))
489 return PTR_ERR(params);
490
491 err = snd_pcm_hw_params(substream, params);
492 if (copy_to_user(_params, params, sizeof(*params))) {
493 if (!err)
494 err = -EFAULT;
495 }
496
497 kfree(params);
498 return err;
499}
500
501static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
502{
503 struct snd_pcm_runtime *runtime;
504 int result = 0;
505
506 if (PCM_RUNTIME_CHECK(substream))
507 return -ENXIO;
508 runtime = substream->runtime;
509 snd_pcm_stream_lock_irq(substream);
510 switch (runtime->status->state) {
511 case SNDRV_PCM_STATE_SETUP:
512 case SNDRV_PCM_STATE_PREPARED:
513 break;
514 default:
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519 if (atomic_read(&substream->mmap_count))
520 return -EBADFD;
521 if (substream->ops->hw_free)
522 result = substream->ops->hw_free(substream);
523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
524 pm_qos_remove_request(&substream->latency_pm_qos_req);
525 return result;
526}
527
528static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
529 struct snd_pcm_sw_params *params)
530{
531 struct snd_pcm_runtime *runtime;
532 int err;
533
534 if (PCM_RUNTIME_CHECK(substream))
535 return -ENXIO;
536 runtime = substream->runtime;
537 snd_pcm_stream_lock_irq(substream);
538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
539 snd_pcm_stream_unlock_irq(substream);
540 return -EBADFD;
541 }
542 snd_pcm_stream_unlock_irq(substream);
543
544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
545 return -EINVAL;
546 if (params->avail_min == 0)
547 return -EINVAL;
548 if (params->silence_size >= runtime->boundary) {
549 if (params->silence_threshold != 0)
550 return -EINVAL;
551 } else {
552 if (params->silence_size > params->silence_threshold)
553 return -EINVAL;
554 if (params->silence_threshold > runtime->buffer_size)
555 return -EINVAL;
556 }
557 err = 0;
558 snd_pcm_stream_lock_irq(substream);
559 runtime->tstamp_mode = params->tstamp_mode;
560 runtime->period_step = params->period_step;
561 runtime->control->avail_min = params->avail_min;
562 runtime->start_threshold = params->start_threshold;
563 runtime->stop_threshold = params->stop_threshold;
564 runtime->silence_threshold = params->silence_threshold;
565 runtime->silence_size = params->silence_size;
566 params->boundary = runtime->boundary;
567 if (snd_pcm_running(substream)) {
568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
569 runtime->silence_size > 0)
570 snd_pcm_playback_silence(substream, ULONG_MAX);
571 err = snd_pcm_update_state(substream, runtime);
572 }
573 snd_pcm_stream_unlock_irq(substream);
574 return err;
575}
576
577static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_sw_params __user * _params)
579{
580 struct snd_pcm_sw_params params;
581 int err;
582 if (copy_from_user(¶ms, _params, sizeof(params)))
583 return -EFAULT;
584 err = snd_pcm_sw_params(substream, ¶ms);
585 if (copy_to_user(_params, ¶ms, sizeof(params)))
586 return -EFAULT;
587 return err;
588}
589
590int snd_pcm_status(struct snd_pcm_substream *substream,
591 struct snd_pcm_status *status)
592{
593 struct snd_pcm_runtime *runtime = substream->runtime;
594
595 snd_pcm_stream_lock_irq(substream);
596 status->state = runtime->status->state;
597 status->suspended_state = runtime->status->suspended_state;
598 if (status->state == SNDRV_PCM_STATE_OPEN)
599 goto _end;
600 status->trigger_tstamp = runtime->trigger_tstamp;
601 if (snd_pcm_running(substream)) {
602 snd_pcm_update_hw_ptr(substream);
603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
604 status->tstamp = runtime->status->tstamp;
605 status->audio_tstamp =
606 runtime->status->audio_tstamp;
607 goto _tstamp_end;
608 }
609 }
610 snd_pcm_gettime(runtime, &status->tstamp);
611 _tstamp_end:
612 status->appl_ptr = runtime->control->appl_ptr;
613 status->hw_ptr = runtime->status->hw_ptr;
614 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
615 status->avail = snd_pcm_playback_avail(runtime);
616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
617 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
618 status->delay = runtime->buffer_size - status->avail;
619 status->delay += runtime->delay;
620 } else
621 status->delay = 0;
622 } else {
623 status->avail = snd_pcm_capture_avail(runtime);
624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
625 status->delay = status->avail + runtime->delay;
626 else
627 status->delay = 0;
628 }
629 status->avail_max = runtime->avail_max;
630 status->overrange = runtime->overrange;
631 runtime->avail_max = 0;
632 runtime->overrange = 0;
633 _end:
634 snd_pcm_stream_unlock_irq(substream);
635 return 0;
636}
637
638static int snd_pcm_status_user(struct snd_pcm_substream *substream,
639 struct snd_pcm_status __user * _status)
640{
641 struct snd_pcm_status status;
642 int res;
643
644 memset(&status, 0, sizeof(status));
645 res = snd_pcm_status(substream, &status);
646 if (res < 0)
647 return res;
648 if (copy_to_user(_status, &status, sizeof(status)))
649 return -EFAULT;
650 return 0;
651}
652
653static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
654 struct snd_pcm_channel_info * info)
655{
656 struct snd_pcm_runtime *runtime;
657 unsigned int channel;
658
659 channel = info->channel;
660 runtime = substream->runtime;
661 snd_pcm_stream_lock_irq(substream);
662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
663 snd_pcm_stream_unlock_irq(substream);
664 return -EBADFD;
665 }
666 snd_pcm_stream_unlock_irq(substream);
667 if (channel >= runtime->channels)
668 return -EINVAL;
669 memset(info, 0, sizeof(*info));
670 info->channel = channel;
671 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
672}
673
674static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
675 struct snd_pcm_channel_info __user * _info)
676{
677 struct snd_pcm_channel_info info;
678 int res;
679
680 if (copy_from_user(&info, _info, sizeof(info)))
681 return -EFAULT;
682 res = snd_pcm_channel_info(substream, &info);
683 if (res < 0)
684 return res;
685 if (copy_to_user(_info, &info, sizeof(info)))
686 return -EFAULT;
687 return 0;
688}
689
690static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
691{
692 struct snd_pcm_runtime *runtime = substream->runtime;
693 if (runtime->trigger_master == NULL)
694 return;
695 if (runtime->trigger_master == substream) {
696 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
697 } else {
698 snd_pcm_trigger_tstamp(runtime->trigger_master);
699 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
700 }
701 runtime->trigger_master = NULL;
702}
703
704struct action_ops {
705 int (*pre_action)(struct snd_pcm_substream *substream, int state);
706 int (*do_action)(struct snd_pcm_substream *substream, int state);
707 void (*undo_action)(struct snd_pcm_substream *substream, int state);
708 void (*post_action)(struct snd_pcm_substream *substream, int state);
709};
710
711/*
712 * this functions is core for handling of linked stream
713 * Note: the stream state might be changed also on failure
714 * Note2: call with calling stream lock + link lock
715 */
716static int snd_pcm_action_group(struct action_ops *ops,
717 struct snd_pcm_substream *substream,
718 int state, int do_lock)
719{
720 struct snd_pcm_substream *s = NULL;
721 struct snd_pcm_substream *s1;
722 int res = 0;
723
724 snd_pcm_group_for_each_entry(s, substream) {
725 if (do_lock && s != substream)
726 spin_lock_nested(&s->self_group.lock,
727 SINGLE_DEPTH_NESTING);
728 res = ops->pre_action(s, state);
729 if (res < 0)
730 goto _unlock;
731 }
732 snd_pcm_group_for_each_entry(s, substream) {
733 res = ops->do_action(s, state);
734 if (res < 0) {
735 if (ops->undo_action) {
736 snd_pcm_group_for_each_entry(s1, substream) {
737 if (s1 == s) /* failed stream */
738 break;
739 ops->undo_action(s1, state);
740 }
741 }
742 s = NULL; /* unlock all */
743 goto _unlock;
744 }
745 }
746 snd_pcm_group_for_each_entry(s, substream) {
747 ops->post_action(s, state);
748 }
749 _unlock:
750 if (do_lock) {
751 /* unlock streams */
752 snd_pcm_group_for_each_entry(s1, substream) {
753 if (s1 != substream)
754 spin_unlock(&s1->self_group.lock);
755 if (s1 == s) /* end */
756 break;
757 }
758 }
759 return res;
760}
761
762/*
763 * Note: call with stream lock
764 */
765static int snd_pcm_action_single(struct action_ops *ops,
766 struct snd_pcm_substream *substream,
767 int state)
768{
769 int res;
770
771 res = ops->pre_action(substream, state);
772 if (res < 0)
773 return res;
774 res = ops->do_action(substream, state);
775 if (res == 0)
776 ops->post_action(substream, state);
777 else if (ops->undo_action)
778 ops->undo_action(substream, state);
779 return res;
780}
781
782/*
783 * Note: call with stream lock
784 */
785static int snd_pcm_action(struct action_ops *ops,
786 struct snd_pcm_substream *substream,
787 int state)
788{
789 int res;
790
791 if (snd_pcm_stream_linked(substream)) {
792 if (!spin_trylock(&substream->group->lock)) {
793 spin_unlock(&substream->self_group.lock);
794 spin_lock(&substream->group->lock);
795 spin_lock(&substream->self_group.lock);
796 }
797 res = snd_pcm_action_group(ops, substream, state, 1);
798 spin_unlock(&substream->group->lock);
799 } else {
800 res = snd_pcm_action_single(ops, substream, state);
801 }
802 return res;
803}
804
805/*
806 * Note: don't use any locks before
807 */
808static int snd_pcm_action_lock_irq(struct action_ops *ops,
809 struct snd_pcm_substream *substream,
810 int state)
811{
812 int res;
813
814 read_lock_irq(&snd_pcm_link_rwlock);
815 if (snd_pcm_stream_linked(substream)) {
816 spin_lock(&substream->group->lock);
817 spin_lock(&substream->self_group.lock);
818 res = snd_pcm_action_group(ops, substream, state, 1);
819 spin_unlock(&substream->self_group.lock);
820 spin_unlock(&substream->group->lock);
821 } else {
822 spin_lock(&substream->self_group.lock);
823 res = snd_pcm_action_single(ops, substream, state);
824 spin_unlock(&substream->self_group.lock);
825 }
826 read_unlock_irq(&snd_pcm_link_rwlock);
827 return res;
828}
829
830/*
831 */
832static int snd_pcm_action_nonatomic(struct action_ops *ops,
833 struct snd_pcm_substream *substream,
834 int state)
835{
836 int res;
837
838 down_read(&snd_pcm_link_rwsem);
839 if (snd_pcm_stream_linked(substream))
840 res = snd_pcm_action_group(ops, substream, state, 0);
841 else
842 res = snd_pcm_action_single(ops, substream, state);
843 up_read(&snd_pcm_link_rwsem);
844 return res;
845}
846
847/*
848 * start callbacks
849 */
850static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
851{
852 struct snd_pcm_runtime *runtime = substream->runtime;
853 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
854 return -EBADFD;
855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
856 !snd_pcm_playback_data(substream))
857 return -EPIPE;
858 runtime->trigger_master = substream;
859 return 0;
860}
861
862static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
863{
864 if (substream->runtime->trigger_master != substream)
865 return 0;
866 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
867}
868
869static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
870{
871 if (substream->runtime->trigger_master == substream)
872 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
873}
874
875static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
876{
877 struct snd_pcm_runtime *runtime = substream->runtime;
878 snd_pcm_trigger_tstamp(substream);
879 runtime->hw_ptr_jiffies = jiffies;
880 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
881 runtime->rate;
882 runtime->status->state = state;
883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
884 runtime->silence_size > 0)
885 snd_pcm_playback_silence(substream, ULONG_MAX);
886 if (substream->timer)
887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
888 &runtime->trigger_tstamp);
889}
890
891static struct action_ops snd_pcm_action_start = {
892 .pre_action = snd_pcm_pre_start,
893 .do_action = snd_pcm_do_start,
894 .undo_action = snd_pcm_undo_start,
895 .post_action = snd_pcm_post_start
896};
897
898/**
899 * snd_pcm_start - start all linked streams
900 * @substream: the PCM substream instance
901 *
902 * Return: Zero if successful, or a negative error code.
903 */
904int snd_pcm_start(struct snd_pcm_substream *substream)
905{
906 return snd_pcm_action(&snd_pcm_action_start, substream,
907 SNDRV_PCM_STATE_RUNNING);
908}
909
910/*
911 * stop callbacks
912 */
913static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
914{
915 struct snd_pcm_runtime *runtime = substream->runtime;
916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
917 return -EBADFD;
918 runtime->trigger_master = substream;
919 return 0;
920}
921
922static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
923{
924 if (substream->runtime->trigger_master == substream &&
925 snd_pcm_running(substream))
926 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
927 return 0; /* unconditonally stop all substreams */
928}
929
930static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
931{
932 struct snd_pcm_runtime *runtime = substream->runtime;
933 if (runtime->status->state != state) {
934 snd_pcm_trigger_tstamp(substream);
935 if (substream->timer)
936 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
937 &runtime->trigger_tstamp);
938 runtime->status->state = state;
939 }
940 wake_up(&runtime->sleep);
941 wake_up(&runtime->tsleep);
942}
943
944static struct action_ops snd_pcm_action_stop = {
945 .pre_action = snd_pcm_pre_stop,
946 .do_action = snd_pcm_do_stop,
947 .post_action = snd_pcm_post_stop
948};
949
950/**
951 * snd_pcm_stop - try to stop all running streams in the substream group
952 * @substream: the PCM substream instance
953 * @state: PCM state after stopping the stream
954 *
955 * The state of each stream is then changed to the given state unconditionally.
956 *
957 * Return: Zero if successful, or a negative error code.
958 */
959int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
960{
961 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
962}
963
964EXPORT_SYMBOL(snd_pcm_stop);
965
966/**
967 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
968 * @substream: the PCM substream
969 *
970 * After stopping, the state is changed to SETUP.
971 * Unlike snd_pcm_stop(), this affects only the given stream.
972 *
973 * Return: Zero if succesful, or a negative error code.
974 */
975int snd_pcm_drain_done(struct snd_pcm_substream *substream)
976{
977 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
978 SNDRV_PCM_STATE_SETUP);
979}
980
981/*
982 * pause callbacks
983 */
984static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
985{
986 struct snd_pcm_runtime *runtime = substream->runtime;
987 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
988 return -ENOSYS;
989 if (push) {
990 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
991 return -EBADFD;
992 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
993 return -EBADFD;
994 runtime->trigger_master = substream;
995 return 0;
996}
997
998static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
999{
1000 if (substream->runtime->trigger_master != substream)
1001 return 0;
1002 /* some drivers might use hw_ptr to recover from the pause -
1003 update the hw_ptr now */
1004 if (push)
1005 snd_pcm_update_hw_ptr(substream);
1006 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1007 * a delta between the current jiffies, this gives a large enough
1008 * delta, effectively to skip the check once.
1009 */
1010 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1011 return substream->ops->trigger(substream,
1012 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1013 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1014}
1015
1016static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1017{
1018 if (substream->runtime->trigger_master == substream)
1019 substream->ops->trigger(substream,
1020 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1021 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1022}
1023
1024static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1025{
1026 struct snd_pcm_runtime *runtime = substream->runtime;
1027 snd_pcm_trigger_tstamp(substream);
1028 if (push) {
1029 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1030 if (substream->timer)
1031 snd_timer_notify(substream->timer,
1032 SNDRV_TIMER_EVENT_MPAUSE,
1033 &runtime->trigger_tstamp);
1034 wake_up(&runtime->sleep);
1035 wake_up(&runtime->tsleep);
1036 } else {
1037 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1038 if (substream->timer)
1039 snd_timer_notify(substream->timer,
1040 SNDRV_TIMER_EVENT_MCONTINUE,
1041 &runtime->trigger_tstamp);
1042 }
1043}
1044
1045static struct action_ops snd_pcm_action_pause = {
1046 .pre_action = snd_pcm_pre_pause,
1047 .do_action = snd_pcm_do_pause,
1048 .undo_action = snd_pcm_undo_pause,
1049 .post_action = snd_pcm_post_pause
1050};
1051
1052/*
1053 * Push/release the pause for all linked streams.
1054 */
1055static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1056{
1057 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1058}
1059
1060#ifdef CONFIG_PM
1061/* suspend */
1062
1063static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1064{
1065 struct snd_pcm_runtime *runtime = substream->runtime;
1066 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1067 return -EBUSY;
1068 runtime->trigger_master = substream;
1069 return 0;
1070}
1071
1072static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1073{
1074 struct snd_pcm_runtime *runtime = substream->runtime;
1075 if (runtime->trigger_master != substream)
1076 return 0;
1077 if (! snd_pcm_running(substream))
1078 return 0;
1079 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1080 return 0; /* suspend unconditionally */
1081}
1082
1083static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1084{
1085 struct snd_pcm_runtime *runtime = substream->runtime;
1086 snd_pcm_trigger_tstamp(substream);
1087 if (substream->timer)
1088 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1089 &runtime->trigger_tstamp);
1090 runtime->status->suspended_state = runtime->status->state;
1091 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1092 wake_up(&runtime->sleep);
1093 wake_up(&runtime->tsleep);
1094}
1095
1096static struct action_ops snd_pcm_action_suspend = {
1097 .pre_action = snd_pcm_pre_suspend,
1098 .do_action = snd_pcm_do_suspend,
1099 .post_action = snd_pcm_post_suspend
1100};
1101
1102/**
1103 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1104 * @substream: the PCM substream
1105 *
1106 * After this call, all streams are changed to SUSPENDED state.
1107 *
1108 * Return: Zero if successful (or @substream is %NULL), or a negative error
1109 * code.
1110 */
1111int snd_pcm_suspend(struct snd_pcm_substream *substream)
1112{
1113 int err;
1114 unsigned long flags;
1115
1116 if (! substream)
1117 return 0;
1118
1119 snd_pcm_stream_lock_irqsave(substream, flags);
1120 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1121 snd_pcm_stream_unlock_irqrestore(substream, flags);
1122 return err;
1123}
1124
1125EXPORT_SYMBOL(snd_pcm_suspend);
1126
1127/**
1128 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1129 * @pcm: the PCM instance
1130 *
1131 * After this call, all streams are changed to SUSPENDED state.
1132 *
1133 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1134 */
1135int snd_pcm_suspend_all(struct snd_pcm *pcm)
1136{
1137 struct snd_pcm_substream *substream;
1138 int stream, err = 0;
1139
1140 if (! pcm)
1141 return 0;
1142
1143 for (stream = 0; stream < 2; stream++) {
1144 for (substream = pcm->streams[stream].substream;
1145 substream; substream = substream->next) {
1146 /* FIXME: the open/close code should lock this as well */
1147 if (substream->runtime == NULL)
1148 continue;
1149 err = snd_pcm_suspend(substream);
1150 if (err < 0 && err != -EBUSY)
1151 return err;
1152 }
1153 }
1154 return 0;
1155}
1156
1157EXPORT_SYMBOL(snd_pcm_suspend_all);
1158
1159/* resume */
1160
1161static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1162{
1163 struct snd_pcm_runtime *runtime = substream->runtime;
1164 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1165 return -ENOSYS;
1166 runtime->trigger_master = substream;
1167 return 0;
1168}
1169
1170static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1171{
1172 struct snd_pcm_runtime *runtime = substream->runtime;
1173 if (runtime->trigger_master != substream)
1174 return 0;
1175 /* DMA not running previously? */
1176 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1177 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1178 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1179 return 0;
1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1181}
1182
1183static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1184{
1185 if (substream->runtime->trigger_master == substream &&
1186 snd_pcm_running(substream))
1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1188}
1189
1190static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1191{
1192 struct snd_pcm_runtime *runtime = substream->runtime;
1193 snd_pcm_trigger_tstamp(substream);
1194 if (substream->timer)
1195 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1196 &runtime->trigger_tstamp);
1197 runtime->status->state = runtime->status->suspended_state;
1198}
1199
1200static struct action_ops snd_pcm_action_resume = {
1201 .pre_action = snd_pcm_pre_resume,
1202 .do_action = snd_pcm_do_resume,
1203 .undo_action = snd_pcm_undo_resume,
1204 .post_action = snd_pcm_post_resume
1205};
1206
1207static int snd_pcm_resume(struct snd_pcm_substream *substream)
1208{
1209 struct snd_card *card = substream->pcm->card;
1210 int res;
1211
1212 snd_power_lock(card);
1213 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1214 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1215 snd_power_unlock(card);
1216 return res;
1217}
1218
1219#else
1220
1221static int snd_pcm_resume(struct snd_pcm_substream *substream)
1222{
1223 return -ENOSYS;
1224}
1225
1226#endif /* CONFIG_PM */
1227
1228/*
1229 * xrun ioctl
1230 *
1231 * Change the RUNNING stream(s) to XRUN state.
1232 */
1233static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1234{
1235 struct snd_card *card = substream->pcm->card;
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 int result;
1238
1239 snd_power_lock(card);
1240 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1241 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1242 if (result < 0)
1243 goto _unlock;
1244 }
1245
1246 snd_pcm_stream_lock_irq(substream);
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_XRUN:
1249 result = 0; /* already there */
1250 break;
1251 case SNDRV_PCM_STATE_RUNNING:
1252 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1253 break;
1254 default:
1255 result = -EBADFD;
1256 }
1257 snd_pcm_stream_unlock_irq(substream);
1258 _unlock:
1259 snd_power_unlock(card);
1260 return result;
1261}
1262
1263/*
1264 * reset ioctl
1265 */
1266static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1267{
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 switch (runtime->status->state) {
1270 case SNDRV_PCM_STATE_RUNNING:
1271 case SNDRV_PCM_STATE_PREPARED:
1272 case SNDRV_PCM_STATE_PAUSED:
1273 case SNDRV_PCM_STATE_SUSPENDED:
1274 return 0;
1275 default:
1276 return -EBADFD;
1277 }
1278}
1279
1280static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1281{
1282 struct snd_pcm_runtime *runtime = substream->runtime;
1283 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1284 if (err < 0)
1285 return err;
1286 runtime->hw_ptr_base = 0;
1287 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1288 runtime->status->hw_ptr % runtime->period_size;
1289 runtime->silence_start = runtime->status->hw_ptr;
1290 runtime->silence_filled = 0;
1291 return 0;
1292}
1293
1294static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1295{
1296 struct snd_pcm_runtime *runtime = substream->runtime;
1297 runtime->control->appl_ptr = runtime->status->hw_ptr;
1298 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1299 runtime->silence_size > 0)
1300 snd_pcm_playback_silence(substream, ULONG_MAX);
1301}
1302
1303static struct action_ops snd_pcm_action_reset = {
1304 .pre_action = snd_pcm_pre_reset,
1305 .do_action = snd_pcm_do_reset,
1306 .post_action = snd_pcm_post_reset
1307};
1308
1309static int snd_pcm_reset(struct snd_pcm_substream *substream)
1310{
1311 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1312}
1313
1314/*
1315 * prepare ioctl
1316 */
1317/* we use the second argument for updating f_flags */
1318static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1319 int f_flags)
1320{
1321 struct snd_pcm_runtime *runtime = substream->runtime;
1322 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1323 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1324 return -EBADFD;
1325 if (snd_pcm_running(substream))
1326 return -EBUSY;
1327 substream->f_flags = f_flags;
1328 return 0;
1329}
1330
1331static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1332{
1333 int err;
1334 err = substream->ops->prepare(substream);
1335 if (err < 0)
1336 return err;
1337 return snd_pcm_do_reset(substream, 0);
1338}
1339
1340static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1341{
1342 struct snd_pcm_runtime *runtime = substream->runtime;
1343 runtime->control->appl_ptr = runtime->status->hw_ptr;
1344 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1345}
1346
1347static struct action_ops snd_pcm_action_prepare = {
1348 .pre_action = snd_pcm_pre_prepare,
1349 .do_action = snd_pcm_do_prepare,
1350 .post_action = snd_pcm_post_prepare
1351};
1352
1353/**
1354 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1355 * @substream: the PCM substream instance
1356 * @file: file to refer f_flags
1357 *
1358 * Return: Zero if successful, or a negative error code.
1359 */
1360static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1361 struct file *file)
1362{
1363 int res;
1364 struct snd_card *card = substream->pcm->card;
1365 int f_flags;
1366
1367 if (file)
1368 f_flags = file->f_flags;
1369 else
1370 f_flags = substream->f_flags;
1371
1372 snd_power_lock(card);
1373 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1374 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1375 substream, f_flags);
1376 snd_power_unlock(card);
1377 return res;
1378}
1379
1380/*
1381 * drain ioctl
1382 */
1383
1384static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1385{
1386 struct snd_pcm_runtime *runtime = substream->runtime;
1387 switch (runtime->status->state) {
1388 case SNDRV_PCM_STATE_OPEN:
1389 case SNDRV_PCM_STATE_DISCONNECTED:
1390 case SNDRV_PCM_STATE_SUSPENDED:
1391 return -EBADFD;
1392 }
1393 runtime->trigger_master = substream;
1394 return 0;
1395}
1396
1397static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1398{
1399 struct snd_pcm_runtime *runtime = substream->runtime;
1400 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1401 switch (runtime->status->state) {
1402 case SNDRV_PCM_STATE_PREPARED:
1403 /* start playback stream if possible */
1404 if (! snd_pcm_playback_empty(substream)) {
1405 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1406 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1407 }
1408 break;
1409 case SNDRV_PCM_STATE_RUNNING:
1410 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1411 break;
1412 case SNDRV_PCM_STATE_XRUN:
1413 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1414 break;
1415 default:
1416 break;
1417 }
1418 } else {
1419 /* stop running stream */
1420 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1421 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1422 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1423 snd_pcm_do_stop(substream, new_state);
1424 snd_pcm_post_stop(substream, new_state);
1425 }
1426 }
1427 return 0;
1428}
1429
1430static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1431{
1432}
1433
1434static struct action_ops snd_pcm_action_drain_init = {
1435 .pre_action = snd_pcm_pre_drain_init,
1436 .do_action = snd_pcm_do_drain_init,
1437 .post_action = snd_pcm_post_drain_init
1438};
1439
1440static int snd_pcm_drop(struct snd_pcm_substream *substream);
1441
1442/*
1443 * Drain the stream(s).
1444 * When the substream is linked, sync until the draining of all playback streams
1445 * is finished.
1446 * After this call, all streams are supposed to be either SETUP or DRAINING
1447 * (capture only) state.
1448 */
1449static int snd_pcm_drain(struct snd_pcm_substream *substream,
1450 struct file *file)
1451{
1452 struct snd_card *card;
1453 struct snd_pcm_runtime *runtime;
1454 struct snd_pcm_substream *s;
1455 wait_queue_t wait;
1456 int result = 0;
1457 int nonblock = 0;
1458
1459 card = substream->pcm->card;
1460 runtime = substream->runtime;
1461
1462 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1463 return -EBADFD;
1464
1465 snd_power_lock(card);
1466 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1467 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1468 if (result < 0) {
1469 snd_power_unlock(card);
1470 return result;
1471 }
1472 }
1473
1474 if (file) {
1475 if (file->f_flags & O_NONBLOCK)
1476 nonblock = 1;
1477 } else if (substream->f_flags & O_NONBLOCK)
1478 nonblock = 1;
1479
1480 down_read(&snd_pcm_link_rwsem);
1481 snd_pcm_stream_lock_irq(substream);
1482 /* resume pause */
1483 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1484 snd_pcm_pause(substream, 0);
1485
1486 /* pre-start/stop - all running streams are changed to DRAINING state */
1487 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1488 if (result < 0)
1489 goto unlock;
1490 /* in non-blocking, we don't wait in ioctl but let caller poll */
1491 if (nonblock) {
1492 result = -EAGAIN;
1493 goto unlock;
1494 }
1495
1496 for (;;) {
1497 long tout;
1498 struct snd_pcm_runtime *to_check;
1499 if (signal_pending(current)) {
1500 result = -ERESTARTSYS;
1501 break;
1502 }
1503 /* find a substream to drain */
1504 to_check = NULL;
1505 snd_pcm_group_for_each_entry(s, substream) {
1506 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1507 continue;
1508 runtime = s->runtime;
1509 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1510 to_check = runtime;
1511 break;
1512 }
1513 }
1514 if (!to_check)
1515 break; /* all drained */
1516 init_waitqueue_entry(&wait, current);
1517 add_wait_queue(&to_check->sleep, &wait);
1518 snd_pcm_stream_unlock_irq(substream);
1519 up_read(&snd_pcm_link_rwsem);
1520 snd_power_unlock(card);
1521 if (runtime->no_period_wakeup)
1522 tout = MAX_SCHEDULE_TIMEOUT;
1523 else {
1524 tout = 10;
1525 if (runtime->rate) {
1526 long t = runtime->period_size * 2 / runtime->rate;
1527 tout = max(t, tout);
1528 }
1529 tout = msecs_to_jiffies(tout * 1000);
1530 }
1531 tout = schedule_timeout_interruptible(tout);
1532 snd_power_lock(card);
1533 down_read(&snd_pcm_link_rwsem);
1534 snd_pcm_stream_lock_irq(substream);
1535 remove_wait_queue(&to_check->sleep, &wait);
1536 if (card->shutdown) {
1537 result = -ENODEV;
1538 break;
1539 }
1540 if (tout == 0) {
1541 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1542 result = -ESTRPIPE;
1543 else {
1544 dev_dbg(substream->pcm->card->dev,
1545 "playback drain error (DMA or IRQ trouble?)\n");
1546 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1547 result = -EIO;
1548 }
1549 break;
1550 }
1551 }
1552
1553 unlock:
1554 snd_pcm_stream_unlock_irq(substream);
1555 up_read(&snd_pcm_link_rwsem);
1556 snd_power_unlock(card);
1557
1558 return result;
1559}
1560
1561/*
1562 * drop ioctl
1563 *
1564 * Immediately put all linked substreams into SETUP state.
1565 */
1566static int snd_pcm_drop(struct snd_pcm_substream *substream)
1567{
1568 struct snd_pcm_runtime *runtime;
1569 int result = 0;
1570
1571 if (PCM_RUNTIME_CHECK(substream))
1572 return -ENXIO;
1573 runtime = substream->runtime;
1574
1575 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1576 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1577 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1578 return -EBADFD;
1579
1580 snd_pcm_stream_lock_irq(substream);
1581 /* resume pause */
1582 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1583 snd_pcm_pause(substream, 0);
1584
1585 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1586 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1587 snd_pcm_stream_unlock_irq(substream);
1588
1589 return result;
1590}
1591
1592
1593static bool is_pcm_file(struct file *file)
1594{
1595 struct inode *inode = file_inode(file);
1596 unsigned int minor;
1597
1598 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1599 return false;
1600 minor = iminor(inode);
1601 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1602 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1603}
1604
1605/*
1606 * PCM link handling
1607 */
1608static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1609{
1610 int res = 0;
1611 struct snd_pcm_file *pcm_file;
1612 struct snd_pcm_substream *substream1;
1613 struct snd_pcm_group *group;
1614 struct fd f = fdget(fd);
1615
1616 if (!f.file)
1617 return -EBADFD;
1618 if (!is_pcm_file(f.file)) {
1619 res = -EBADFD;
1620 goto _badf;
1621 }
1622 pcm_file = f.file->private_data;
1623 substream1 = pcm_file->substream;
1624 group = kmalloc(sizeof(*group), GFP_KERNEL);
1625 if (!group) {
1626 res = -ENOMEM;
1627 goto _nolock;
1628 }
1629 down_write(&snd_pcm_link_rwsem);
1630 write_lock_irq(&snd_pcm_link_rwlock);
1631 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1632 substream->runtime->status->state != substream1->runtime->status->state) {
1633 res = -EBADFD;
1634 goto _end;
1635 }
1636 if (snd_pcm_stream_linked(substream1)) {
1637 res = -EALREADY;
1638 goto _end;
1639 }
1640 if (!snd_pcm_stream_linked(substream)) {
1641 substream->group = group;
1642 group = NULL;
1643 spin_lock_init(&substream->group->lock);
1644 INIT_LIST_HEAD(&substream->group->substreams);
1645 list_add_tail(&substream->link_list, &substream->group->substreams);
1646 substream->group->count = 1;
1647 }
1648 list_add_tail(&substream1->link_list, &substream->group->substreams);
1649 substream->group->count++;
1650 substream1->group = substream->group;
1651 _end:
1652 write_unlock_irq(&snd_pcm_link_rwlock);
1653 up_write(&snd_pcm_link_rwsem);
1654 _nolock:
1655 snd_card_unref(substream1->pcm->card);
1656 kfree(group);
1657 _badf:
1658 fdput(f);
1659 return res;
1660}
1661
1662static void relink_to_local(struct snd_pcm_substream *substream)
1663{
1664 substream->group = &substream->self_group;
1665 INIT_LIST_HEAD(&substream->self_group.substreams);
1666 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1667}
1668
1669static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1670{
1671 struct snd_pcm_substream *s;
1672 int res = 0;
1673
1674 down_write(&snd_pcm_link_rwsem);
1675 write_lock_irq(&snd_pcm_link_rwlock);
1676 if (!snd_pcm_stream_linked(substream)) {
1677 res = -EALREADY;
1678 goto _end;
1679 }
1680 list_del(&substream->link_list);
1681 substream->group->count--;
1682 if (substream->group->count == 1) { /* detach the last stream, too */
1683 snd_pcm_group_for_each_entry(s, substream) {
1684 relink_to_local(s);
1685 break;
1686 }
1687 kfree(substream->group);
1688 }
1689 relink_to_local(substream);
1690 _end:
1691 write_unlock_irq(&snd_pcm_link_rwlock);
1692 up_write(&snd_pcm_link_rwsem);
1693 return res;
1694}
1695
1696/*
1697 * hw configurator
1698 */
1699static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1700 struct snd_pcm_hw_rule *rule)
1701{
1702 struct snd_interval t;
1703 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1704 hw_param_interval_c(params, rule->deps[1]), &t);
1705 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1706}
1707
1708static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1709 struct snd_pcm_hw_rule *rule)
1710{
1711 struct snd_interval t;
1712 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1713 hw_param_interval_c(params, rule->deps[1]), &t);
1714 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1715}
1716
1717static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1718 struct snd_pcm_hw_rule *rule)
1719{
1720 struct snd_interval t;
1721 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1722 hw_param_interval_c(params, rule->deps[1]),
1723 (unsigned long) rule->private, &t);
1724 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1725}
1726
1727static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1728 struct snd_pcm_hw_rule *rule)
1729{
1730 struct snd_interval t;
1731 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1732 (unsigned long) rule->private,
1733 hw_param_interval_c(params, rule->deps[1]), &t);
1734 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1735}
1736
1737static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1738 struct snd_pcm_hw_rule *rule)
1739{
1740 unsigned int k;
1741 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1742 struct snd_mask m;
1743 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1744 snd_mask_any(&m);
1745 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1746 int bits;
1747 if (! snd_mask_test(mask, k))
1748 continue;
1749 bits = snd_pcm_format_physical_width(k);
1750 if (bits <= 0)
1751 continue; /* ignore invalid formats */
1752 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1753 snd_mask_reset(&m, k);
1754 }
1755 return snd_mask_refine(mask, &m);
1756}
1757
1758static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1759 struct snd_pcm_hw_rule *rule)
1760{
1761 struct snd_interval t;
1762 unsigned int k;
1763 t.min = UINT_MAX;
1764 t.max = 0;
1765 t.openmin = 0;
1766 t.openmax = 0;
1767 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1768 int bits;
1769 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1770 continue;
1771 bits = snd_pcm_format_physical_width(k);
1772 if (bits <= 0)
1773 continue; /* ignore invalid formats */
1774 if (t.min > (unsigned)bits)
1775 t.min = bits;
1776 if (t.max < (unsigned)bits)
1777 t.max = bits;
1778 }
1779 t.integer = 1;
1780 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1781}
1782
1783#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1784#error "Change this table"
1785#endif
1786
1787static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1788 48000, 64000, 88200, 96000, 176400, 192000 };
1789
1790const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1791 .count = ARRAY_SIZE(rates),
1792 .list = rates,
1793};
1794
1795static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1796 struct snd_pcm_hw_rule *rule)
1797{
1798 struct snd_pcm_hardware *hw = rule->private;
1799 return snd_interval_list(hw_param_interval(params, rule->var),
1800 snd_pcm_known_rates.count,
1801 snd_pcm_known_rates.list, hw->rates);
1802}
1803
1804static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1805 struct snd_pcm_hw_rule *rule)
1806{
1807 struct snd_interval t;
1808 struct snd_pcm_substream *substream = rule->private;
1809 t.min = 0;
1810 t.max = substream->buffer_bytes_max;
1811 t.openmin = 0;
1812 t.openmax = 0;
1813 t.integer = 1;
1814 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1815}
1816
1817int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1818{
1819 struct snd_pcm_runtime *runtime = substream->runtime;
1820 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1821 int k, err;
1822
1823 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1824 snd_mask_any(constrs_mask(constrs, k));
1825 }
1826
1827 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1828 snd_interval_any(constrs_interval(constrs, k));
1829 }
1830
1831 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1832 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1833 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1834 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1835 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1836
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1838 snd_pcm_hw_rule_format, NULL,
1839 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1843 snd_pcm_hw_rule_sample_bits, NULL,
1844 SNDRV_PCM_HW_PARAM_FORMAT,
1845 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1846 if (err < 0)
1847 return err;
1848 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1849 snd_pcm_hw_rule_div, NULL,
1850 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1851 if (err < 0)
1852 return err;
1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1854 snd_pcm_hw_rule_mul, NULL,
1855 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1856 if (err < 0)
1857 return err;
1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1860 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1861 if (err < 0)
1862 return err;
1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1864 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1866 if (err < 0)
1867 return err;
1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1869 snd_pcm_hw_rule_div, NULL,
1870 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1871 if (err < 0)
1872 return err;
1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1874 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1875 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1876 if (err < 0)
1877 return err;
1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1879 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1880 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1881 if (err < 0)
1882 return err;
1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1884 snd_pcm_hw_rule_div, NULL,
1885 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1886 if (err < 0)
1887 return err;
1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1889 snd_pcm_hw_rule_div, NULL,
1890 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1891 if (err < 0)
1892 return err;
1893 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1895 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896 if (err < 0)
1897 return err;
1898 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1899 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1900 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1901 if (err < 0)
1902 return err;
1903 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1904 snd_pcm_hw_rule_mul, NULL,
1905 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1906 if (err < 0)
1907 return err;
1908 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1910 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1911 if (err < 0)
1912 return err;
1913 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1914 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1915 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1916 if (err < 0)
1917 return err;
1918 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1919 snd_pcm_hw_rule_muldivk, (void*) 8,
1920 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1921 if (err < 0)
1922 return err;
1923 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1924 snd_pcm_hw_rule_muldivk, (void*) 8,
1925 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1926 if (err < 0)
1927 return err;
1928 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1929 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1930 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1931 if (err < 0)
1932 return err;
1933 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1934 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1935 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1936 if (err < 0)
1937 return err;
1938 return 0;
1939}
1940
1941int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1942{
1943 struct snd_pcm_runtime *runtime = substream->runtime;
1944 struct snd_pcm_hardware *hw = &runtime->hw;
1945 int err;
1946 unsigned int mask = 0;
1947
1948 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1949 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1950 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1951 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1952 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1953 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1954 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1955 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1956 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1957 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1958 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1959 }
1960 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1961 if (err < 0)
1962 return err;
1963
1964 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1965 if (err < 0)
1966 return err;
1967
1968 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1969 if (err < 0)
1970 return err;
1971
1972 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1973 hw->channels_min, hw->channels_max);
1974 if (err < 0)
1975 return err;
1976
1977 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1978 hw->rate_min, hw->rate_max);
1979 if (err < 0)
1980 return err;
1981
1982 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1983 hw->period_bytes_min, hw->period_bytes_max);
1984 if (err < 0)
1985 return err;
1986
1987 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1988 hw->periods_min, hw->periods_max);
1989 if (err < 0)
1990 return err;
1991
1992 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1993 hw->period_bytes_min, hw->buffer_bytes_max);
1994 if (err < 0)
1995 return err;
1996
1997 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1998 snd_pcm_hw_rule_buffer_bytes_max, substream,
1999 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2000 if (err < 0)
2001 return err;
2002
2003 /* FIXME: remove */
2004 if (runtime->dma_bytes) {
2005 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2006 if (err < 0)
2007 return err;
2008 }
2009
2010 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2011 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2012 snd_pcm_hw_rule_rate, hw,
2013 SNDRV_PCM_HW_PARAM_RATE, -1);
2014 if (err < 0)
2015 return err;
2016 }
2017
2018 /* FIXME: this belong to lowlevel */
2019 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2020
2021 return 0;
2022}
2023
2024static void pcm_release_private(struct snd_pcm_substream *substream)
2025{
2026 snd_pcm_unlink(substream);
2027}
2028
2029void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2030{
2031 substream->ref_count--;
2032 if (substream->ref_count > 0)
2033 return;
2034
2035 snd_pcm_drop(substream);
2036 if (substream->hw_opened) {
2037 if (substream->ops->hw_free != NULL)
2038 substream->ops->hw_free(substream);
2039 substream->ops->close(substream);
2040 substream->hw_opened = 0;
2041 }
2042 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2043 pm_qos_remove_request(&substream->latency_pm_qos_req);
2044 if (substream->pcm_release) {
2045 substream->pcm_release(substream);
2046 substream->pcm_release = NULL;
2047 }
2048 snd_pcm_detach_substream(substream);
2049}
2050
2051EXPORT_SYMBOL(snd_pcm_release_substream);
2052
2053int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2054 struct file *file,
2055 struct snd_pcm_substream **rsubstream)
2056{
2057 struct snd_pcm_substream *substream;
2058 int err;
2059
2060 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2061 if (err < 0)
2062 return err;
2063 if (substream->ref_count > 1) {
2064 *rsubstream = substream;
2065 return 0;
2066 }
2067
2068 err = snd_pcm_hw_constraints_init(substream);
2069 if (err < 0) {
2070 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2071 goto error;
2072 }
2073
2074 if ((err = substream->ops->open(substream)) < 0)
2075 goto error;
2076
2077 substream->hw_opened = 1;
2078
2079 err = snd_pcm_hw_constraints_complete(substream);
2080 if (err < 0) {
2081 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2082 goto error;
2083 }
2084
2085 *rsubstream = substream;
2086 return 0;
2087
2088 error:
2089 snd_pcm_release_substream(substream);
2090 return err;
2091}
2092
2093EXPORT_SYMBOL(snd_pcm_open_substream);
2094
2095static int snd_pcm_open_file(struct file *file,
2096 struct snd_pcm *pcm,
2097 int stream)
2098{
2099 struct snd_pcm_file *pcm_file;
2100 struct snd_pcm_substream *substream;
2101 int err;
2102
2103 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2104 if (err < 0)
2105 return err;
2106
2107 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2108 if (pcm_file == NULL) {
2109 snd_pcm_release_substream(substream);
2110 return -ENOMEM;
2111 }
2112 pcm_file->substream = substream;
2113 if (substream->ref_count == 1) {
2114 substream->file = pcm_file;
2115 substream->pcm_release = pcm_release_private;
2116 }
2117 file->private_data = pcm_file;
2118
2119 return 0;
2120}
2121
2122static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2123{
2124 struct snd_pcm *pcm;
2125 int err = nonseekable_open(inode, file);
2126 if (err < 0)
2127 return err;
2128 pcm = snd_lookup_minor_data(iminor(inode),
2129 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2130 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2131 if (pcm)
2132 snd_card_unref(pcm->card);
2133 return err;
2134}
2135
2136static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2137{
2138 struct snd_pcm *pcm;
2139 int err = nonseekable_open(inode, file);
2140 if (err < 0)
2141 return err;
2142 pcm = snd_lookup_minor_data(iminor(inode),
2143 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2144 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2145 if (pcm)
2146 snd_card_unref(pcm->card);
2147 return err;
2148}
2149
2150static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2151{
2152 int err;
2153 wait_queue_t wait;
2154
2155 if (pcm == NULL) {
2156 err = -ENODEV;
2157 goto __error1;
2158 }
2159 err = snd_card_file_add(pcm->card, file);
2160 if (err < 0)
2161 goto __error1;
2162 if (!try_module_get(pcm->card->module)) {
2163 err = -EFAULT;
2164 goto __error2;
2165 }
2166 init_waitqueue_entry(&wait, current);
2167 add_wait_queue(&pcm->open_wait, &wait);
2168 mutex_lock(&pcm->open_mutex);
2169 while (1) {
2170 err = snd_pcm_open_file(file, pcm, stream);
2171 if (err >= 0)
2172 break;
2173 if (err == -EAGAIN) {
2174 if (file->f_flags & O_NONBLOCK) {
2175 err = -EBUSY;
2176 break;
2177 }
2178 } else
2179 break;
2180 set_current_state(TASK_INTERRUPTIBLE);
2181 mutex_unlock(&pcm->open_mutex);
2182 schedule();
2183 mutex_lock(&pcm->open_mutex);
2184 if (pcm->card->shutdown) {
2185 err = -ENODEV;
2186 break;
2187 }
2188 if (signal_pending(current)) {
2189 err = -ERESTARTSYS;
2190 break;
2191 }
2192 }
2193 remove_wait_queue(&pcm->open_wait, &wait);
2194 mutex_unlock(&pcm->open_mutex);
2195 if (err < 0)
2196 goto __error;
2197 return err;
2198
2199 __error:
2200 module_put(pcm->card->module);
2201 __error2:
2202 snd_card_file_remove(pcm->card, file);
2203 __error1:
2204 return err;
2205}
2206
2207static int snd_pcm_release(struct inode *inode, struct file *file)
2208{
2209 struct snd_pcm *pcm;
2210 struct snd_pcm_substream *substream;
2211 struct snd_pcm_file *pcm_file;
2212
2213 pcm_file = file->private_data;
2214 substream = pcm_file->substream;
2215 if (snd_BUG_ON(!substream))
2216 return -ENXIO;
2217 pcm = substream->pcm;
2218 mutex_lock(&pcm->open_mutex);
2219 snd_pcm_release_substream(substream);
2220 kfree(pcm_file);
2221 mutex_unlock(&pcm->open_mutex);
2222 wake_up(&pcm->open_wait);
2223 module_put(pcm->card->module);
2224 snd_card_file_remove(pcm->card, file);
2225 return 0;
2226}
2227
2228static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2229 snd_pcm_uframes_t frames)
2230{
2231 struct snd_pcm_runtime *runtime = substream->runtime;
2232 snd_pcm_sframes_t appl_ptr;
2233 snd_pcm_sframes_t ret;
2234 snd_pcm_sframes_t hw_avail;
2235
2236 if (frames == 0)
2237 return 0;
2238
2239 snd_pcm_stream_lock_irq(substream);
2240 switch (runtime->status->state) {
2241 case SNDRV_PCM_STATE_PREPARED:
2242 break;
2243 case SNDRV_PCM_STATE_DRAINING:
2244 case SNDRV_PCM_STATE_RUNNING:
2245 if (snd_pcm_update_hw_ptr(substream) >= 0)
2246 break;
2247 /* Fall through */
2248 case SNDRV_PCM_STATE_XRUN:
2249 ret = -EPIPE;
2250 goto __end;
2251 case SNDRV_PCM_STATE_SUSPENDED:
2252 ret = -ESTRPIPE;
2253 goto __end;
2254 default:
2255 ret = -EBADFD;
2256 goto __end;
2257 }
2258
2259 hw_avail = snd_pcm_playback_hw_avail(runtime);
2260 if (hw_avail <= 0) {
2261 ret = 0;
2262 goto __end;
2263 }
2264 if (frames > (snd_pcm_uframes_t)hw_avail)
2265 frames = hw_avail;
2266 appl_ptr = runtime->control->appl_ptr - frames;
2267 if (appl_ptr < 0)
2268 appl_ptr += runtime->boundary;
2269 runtime->control->appl_ptr = appl_ptr;
2270 ret = frames;
2271 __end:
2272 snd_pcm_stream_unlock_irq(substream);
2273 return ret;
2274}
2275
2276static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2277 snd_pcm_uframes_t frames)
2278{
2279 struct snd_pcm_runtime *runtime = substream->runtime;
2280 snd_pcm_sframes_t appl_ptr;
2281 snd_pcm_sframes_t ret;
2282 snd_pcm_sframes_t hw_avail;
2283
2284 if (frames == 0)
2285 return 0;
2286
2287 snd_pcm_stream_lock_irq(substream);
2288 switch (runtime->status->state) {
2289 case SNDRV_PCM_STATE_PREPARED:
2290 case SNDRV_PCM_STATE_DRAINING:
2291 break;
2292 case SNDRV_PCM_STATE_RUNNING:
2293 if (snd_pcm_update_hw_ptr(substream) >= 0)
2294 break;
2295 /* Fall through */
2296 case SNDRV_PCM_STATE_XRUN:
2297 ret = -EPIPE;
2298 goto __end;
2299 case SNDRV_PCM_STATE_SUSPENDED:
2300 ret = -ESTRPIPE;
2301 goto __end;
2302 default:
2303 ret = -EBADFD;
2304 goto __end;
2305 }
2306
2307 hw_avail = snd_pcm_capture_hw_avail(runtime);
2308 if (hw_avail <= 0) {
2309 ret = 0;
2310 goto __end;
2311 }
2312 if (frames > (snd_pcm_uframes_t)hw_avail)
2313 frames = hw_avail;
2314 appl_ptr = runtime->control->appl_ptr - frames;
2315 if (appl_ptr < 0)
2316 appl_ptr += runtime->boundary;
2317 runtime->control->appl_ptr = appl_ptr;
2318 ret = frames;
2319 __end:
2320 snd_pcm_stream_unlock_irq(substream);
2321 return ret;
2322}
2323
2324static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2325 snd_pcm_uframes_t frames)
2326{
2327 struct snd_pcm_runtime *runtime = substream->runtime;
2328 snd_pcm_sframes_t appl_ptr;
2329 snd_pcm_sframes_t ret;
2330 snd_pcm_sframes_t avail;
2331
2332 if (frames == 0)
2333 return 0;
2334
2335 snd_pcm_stream_lock_irq(substream);
2336 switch (runtime->status->state) {
2337 case SNDRV_PCM_STATE_PREPARED:
2338 case SNDRV_PCM_STATE_PAUSED:
2339 break;
2340 case SNDRV_PCM_STATE_DRAINING:
2341 case SNDRV_PCM_STATE_RUNNING:
2342 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343 break;
2344 /* Fall through */
2345 case SNDRV_PCM_STATE_XRUN:
2346 ret = -EPIPE;
2347 goto __end;
2348 case SNDRV_PCM_STATE_SUSPENDED:
2349 ret = -ESTRPIPE;
2350 goto __end;
2351 default:
2352 ret = -EBADFD;
2353 goto __end;
2354 }
2355
2356 avail = snd_pcm_playback_avail(runtime);
2357 if (avail <= 0) {
2358 ret = 0;
2359 goto __end;
2360 }
2361 if (frames > (snd_pcm_uframes_t)avail)
2362 frames = avail;
2363 appl_ptr = runtime->control->appl_ptr + frames;
2364 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365 appl_ptr -= runtime->boundary;
2366 runtime->control->appl_ptr = appl_ptr;
2367 ret = frames;
2368 __end:
2369 snd_pcm_stream_unlock_irq(substream);
2370 return ret;
2371}
2372
2373static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2374 snd_pcm_uframes_t frames)
2375{
2376 struct snd_pcm_runtime *runtime = substream->runtime;
2377 snd_pcm_sframes_t appl_ptr;
2378 snd_pcm_sframes_t ret;
2379 snd_pcm_sframes_t avail;
2380
2381 if (frames == 0)
2382 return 0;
2383
2384 snd_pcm_stream_lock_irq(substream);
2385 switch (runtime->status->state) {
2386 case SNDRV_PCM_STATE_PREPARED:
2387 case SNDRV_PCM_STATE_DRAINING:
2388 case SNDRV_PCM_STATE_PAUSED:
2389 break;
2390 case SNDRV_PCM_STATE_RUNNING:
2391 if (snd_pcm_update_hw_ptr(substream) >= 0)
2392 break;
2393 /* Fall through */
2394 case SNDRV_PCM_STATE_XRUN:
2395 ret = -EPIPE;
2396 goto __end;
2397 case SNDRV_PCM_STATE_SUSPENDED:
2398 ret = -ESTRPIPE;
2399 goto __end;
2400 default:
2401 ret = -EBADFD;
2402 goto __end;
2403 }
2404
2405 avail = snd_pcm_capture_avail(runtime);
2406 if (avail <= 0) {
2407 ret = 0;
2408 goto __end;
2409 }
2410 if (frames > (snd_pcm_uframes_t)avail)
2411 frames = avail;
2412 appl_ptr = runtime->control->appl_ptr + frames;
2413 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2414 appl_ptr -= runtime->boundary;
2415 runtime->control->appl_ptr = appl_ptr;
2416 ret = frames;
2417 __end:
2418 snd_pcm_stream_unlock_irq(substream);
2419 return ret;
2420}
2421
2422static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2423{
2424 struct snd_pcm_runtime *runtime = substream->runtime;
2425 int err;
2426
2427 snd_pcm_stream_lock_irq(substream);
2428 switch (runtime->status->state) {
2429 case SNDRV_PCM_STATE_DRAINING:
2430 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2431 goto __badfd;
2432 /* Fall through */
2433 case SNDRV_PCM_STATE_RUNNING:
2434 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2435 break;
2436 /* Fall through */
2437 case SNDRV_PCM_STATE_PREPARED:
2438 case SNDRV_PCM_STATE_SUSPENDED:
2439 err = 0;
2440 break;
2441 case SNDRV_PCM_STATE_XRUN:
2442 err = -EPIPE;
2443 break;
2444 default:
2445 __badfd:
2446 err = -EBADFD;
2447 break;
2448 }
2449 snd_pcm_stream_unlock_irq(substream);
2450 return err;
2451}
2452
2453static int snd_pcm_delay(struct snd_pcm_substream *substream,
2454 snd_pcm_sframes_t __user *res)
2455{
2456 struct snd_pcm_runtime *runtime = substream->runtime;
2457 int err;
2458 snd_pcm_sframes_t n = 0;
2459
2460 snd_pcm_stream_lock_irq(substream);
2461 switch (runtime->status->state) {
2462 case SNDRV_PCM_STATE_DRAINING:
2463 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2464 goto __badfd;
2465 /* Fall through */
2466 case SNDRV_PCM_STATE_RUNNING:
2467 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2468 break;
2469 /* Fall through */
2470 case SNDRV_PCM_STATE_PREPARED:
2471 case SNDRV_PCM_STATE_SUSPENDED:
2472 err = 0;
2473 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2474 n = snd_pcm_playback_hw_avail(runtime);
2475 else
2476 n = snd_pcm_capture_avail(runtime);
2477 n += runtime->delay;
2478 break;
2479 case SNDRV_PCM_STATE_XRUN:
2480 err = -EPIPE;
2481 break;
2482 default:
2483 __badfd:
2484 err = -EBADFD;
2485 break;
2486 }
2487 snd_pcm_stream_unlock_irq(substream);
2488 if (!err)
2489 if (put_user(n, res))
2490 err = -EFAULT;
2491 return err;
2492}
2493
2494static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2495 struct snd_pcm_sync_ptr __user *_sync_ptr)
2496{
2497 struct snd_pcm_runtime *runtime = substream->runtime;
2498 struct snd_pcm_sync_ptr sync_ptr;
2499 volatile struct snd_pcm_mmap_status *status;
2500 volatile struct snd_pcm_mmap_control *control;
2501 int err;
2502
2503 memset(&sync_ptr, 0, sizeof(sync_ptr));
2504 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2505 return -EFAULT;
2506 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2507 return -EFAULT;
2508 status = runtime->status;
2509 control = runtime->control;
2510 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2511 err = snd_pcm_hwsync(substream);
2512 if (err < 0)
2513 return err;
2514 }
2515 snd_pcm_stream_lock_irq(substream);
2516 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2517 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2518 else
2519 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2520 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2521 control->avail_min = sync_ptr.c.control.avail_min;
2522 else
2523 sync_ptr.c.control.avail_min = control->avail_min;
2524 sync_ptr.s.status.state = status->state;
2525 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2526 sync_ptr.s.status.tstamp = status->tstamp;
2527 sync_ptr.s.status.suspended_state = status->suspended_state;
2528 snd_pcm_stream_unlock_irq(substream);
2529 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2530 return -EFAULT;
2531 return 0;
2532}
2533
2534static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2535{
2536 struct snd_pcm_runtime *runtime = substream->runtime;
2537 int arg;
2538
2539 if (get_user(arg, _arg))
2540 return -EFAULT;
2541 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2542 return -EINVAL;
2543 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2544 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2545 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2546 return 0;
2547}
2548
2549static int snd_pcm_common_ioctl1(struct file *file,
2550 struct snd_pcm_substream *substream,
2551 unsigned int cmd, void __user *arg)
2552{
2553 switch (cmd) {
2554 case SNDRV_PCM_IOCTL_PVERSION:
2555 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2556 case SNDRV_PCM_IOCTL_INFO:
2557 return snd_pcm_info_user(substream, arg);
2558 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2559 return 0;
2560 case SNDRV_PCM_IOCTL_TTSTAMP:
2561 return snd_pcm_tstamp(substream, arg);
2562 case SNDRV_PCM_IOCTL_HW_REFINE:
2563 return snd_pcm_hw_refine_user(substream, arg);
2564 case SNDRV_PCM_IOCTL_HW_PARAMS:
2565 return snd_pcm_hw_params_user(substream, arg);
2566 case SNDRV_PCM_IOCTL_HW_FREE:
2567 return snd_pcm_hw_free(substream);
2568 case SNDRV_PCM_IOCTL_SW_PARAMS:
2569 return snd_pcm_sw_params_user(substream, arg);
2570 case SNDRV_PCM_IOCTL_STATUS:
2571 return snd_pcm_status_user(substream, arg);
2572 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2573 return snd_pcm_channel_info_user(substream, arg);
2574 case SNDRV_PCM_IOCTL_PREPARE:
2575 return snd_pcm_prepare(substream, file);
2576 case SNDRV_PCM_IOCTL_RESET:
2577 return snd_pcm_reset(substream);
2578 case SNDRV_PCM_IOCTL_START:
2579 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2580 case SNDRV_PCM_IOCTL_LINK:
2581 return snd_pcm_link(substream, (int)(unsigned long) arg);
2582 case SNDRV_PCM_IOCTL_UNLINK:
2583 return snd_pcm_unlink(substream);
2584 case SNDRV_PCM_IOCTL_RESUME:
2585 return snd_pcm_resume(substream);
2586 case SNDRV_PCM_IOCTL_XRUN:
2587 return snd_pcm_xrun(substream);
2588 case SNDRV_PCM_IOCTL_HWSYNC:
2589 return snd_pcm_hwsync(substream);
2590 case SNDRV_PCM_IOCTL_DELAY:
2591 return snd_pcm_delay(substream, arg);
2592 case SNDRV_PCM_IOCTL_SYNC_PTR:
2593 return snd_pcm_sync_ptr(substream, arg);
2594#ifdef CONFIG_SND_SUPPORT_OLD_API
2595 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2596 return snd_pcm_hw_refine_old_user(substream, arg);
2597 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2598 return snd_pcm_hw_params_old_user(substream, arg);
2599#endif
2600 case SNDRV_PCM_IOCTL_DRAIN:
2601 return snd_pcm_drain(substream, file);
2602 case SNDRV_PCM_IOCTL_DROP:
2603 return snd_pcm_drop(substream);
2604 case SNDRV_PCM_IOCTL_PAUSE:
2605 {
2606 int res;
2607 snd_pcm_stream_lock_irq(substream);
2608 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2609 snd_pcm_stream_unlock_irq(substream);
2610 return res;
2611 }
2612 }
2613 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2614 return -ENOTTY;
2615}
2616
2617static int snd_pcm_playback_ioctl1(struct file *file,
2618 struct snd_pcm_substream *substream,
2619 unsigned int cmd, void __user *arg)
2620{
2621 if (snd_BUG_ON(!substream))
2622 return -ENXIO;
2623 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2624 return -EINVAL;
2625 switch (cmd) {
2626 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2627 {
2628 struct snd_xferi xferi;
2629 struct snd_xferi __user *_xferi = arg;
2630 struct snd_pcm_runtime *runtime = substream->runtime;
2631 snd_pcm_sframes_t result;
2632 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2633 return -EBADFD;
2634 if (put_user(0, &_xferi->result))
2635 return -EFAULT;
2636 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2637 return -EFAULT;
2638 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2639 __put_user(result, &_xferi->result);
2640 return result < 0 ? result : 0;
2641 }
2642 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2643 {
2644 struct snd_xfern xfern;
2645 struct snd_xfern __user *_xfern = arg;
2646 struct snd_pcm_runtime *runtime = substream->runtime;
2647 void __user **bufs;
2648 snd_pcm_sframes_t result;
2649 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2650 return -EBADFD;
2651 if (runtime->channels > 128)
2652 return -EINVAL;
2653 if (put_user(0, &_xfern->result))
2654 return -EFAULT;
2655 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2656 return -EFAULT;
2657
2658 bufs = memdup_user(xfern.bufs,
2659 sizeof(void *) * runtime->channels);
2660 if (IS_ERR(bufs))
2661 return PTR_ERR(bufs);
2662 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2663 kfree(bufs);
2664 __put_user(result, &_xfern->result);
2665 return result < 0 ? result : 0;
2666 }
2667 case SNDRV_PCM_IOCTL_REWIND:
2668 {
2669 snd_pcm_uframes_t frames;
2670 snd_pcm_uframes_t __user *_frames = arg;
2671 snd_pcm_sframes_t result;
2672 if (get_user(frames, _frames))
2673 return -EFAULT;
2674 if (put_user(0, _frames))
2675 return -EFAULT;
2676 result = snd_pcm_playback_rewind(substream, frames);
2677 __put_user(result, _frames);
2678 return result < 0 ? result : 0;
2679 }
2680 case SNDRV_PCM_IOCTL_FORWARD:
2681 {
2682 snd_pcm_uframes_t frames;
2683 snd_pcm_uframes_t __user *_frames = arg;
2684 snd_pcm_sframes_t result;
2685 if (get_user(frames, _frames))
2686 return -EFAULT;
2687 if (put_user(0, _frames))
2688 return -EFAULT;
2689 result = snd_pcm_playback_forward(substream, frames);
2690 __put_user(result, _frames);
2691 return result < 0 ? result : 0;
2692 }
2693 }
2694 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2695}
2696
2697static int snd_pcm_capture_ioctl1(struct file *file,
2698 struct snd_pcm_substream *substream,
2699 unsigned int cmd, void __user *arg)
2700{
2701 if (snd_BUG_ON(!substream))
2702 return -ENXIO;
2703 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2704 return -EINVAL;
2705 switch (cmd) {
2706 case SNDRV_PCM_IOCTL_READI_FRAMES:
2707 {
2708 struct snd_xferi xferi;
2709 struct snd_xferi __user *_xferi = arg;
2710 struct snd_pcm_runtime *runtime = substream->runtime;
2711 snd_pcm_sframes_t result;
2712 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2713 return -EBADFD;
2714 if (put_user(0, &_xferi->result))
2715 return -EFAULT;
2716 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2717 return -EFAULT;
2718 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2719 __put_user(result, &_xferi->result);
2720 return result < 0 ? result : 0;
2721 }
2722 case SNDRV_PCM_IOCTL_READN_FRAMES:
2723 {
2724 struct snd_xfern xfern;
2725 struct snd_xfern __user *_xfern = arg;
2726 struct snd_pcm_runtime *runtime = substream->runtime;
2727 void *bufs;
2728 snd_pcm_sframes_t result;
2729 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2730 return -EBADFD;
2731 if (runtime->channels > 128)
2732 return -EINVAL;
2733 if (put_user(0, &_xfern->result))
2734 return -EFAULT;
2735 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2736 return -EFAULT;
2737
2738 bufs = memdup_user(xfern.bufs,
2739 sizeof(void *) * runtime->channels);
2740 if (IS_ERR(bufs))
2741 return PTR_ERR(bufs);
2742 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2743 kfree(bufs);
2744 __put_user(result, &_xfern->result);
2745 return result < 0 ? result : 0;
2746 }
2747 case SNDRV_PCM_IOCTL_REWIND:
2748 {
2749 snd_pcm_uframes_t frames;
2750 snd_pcm_uframes_t __user *_frames = arg;
2751 snd_pcm_sframes_t result;
2752 if (get_user(frames, _frames))
2753 return -EFAULT;
2754 if (put_user(0, _frames))
2755 return -EFAULT;
2756 result = snd_pcm_capture_rewind(substream, frames);
2757 __put_user(result, _frames);
2758 return result < 0 ? result : 0;
2759 }
2760 case SNDRV_PCM_IOCTL_FORWARD:
2761 {
2762 snd_pcm_uframes_t frames;
2763 snd_pcm_uframes_t __user *_frames = arg;
2764 snd_pcm_sframes_t result;
2765 if (get_user(frames, _frames))
2766 return -EFAULT;
2767 if (put_user(0, _frames))
2768 return -EFAULT;
2769 result = snd_pcm_capture_forward(substream, frames);
2770 __put_user(result, _frames);
2771 return result < 0 ? result : 0;
2772 }
2773 }
2774 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2775}
2776
2777static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2778 unsigned long arg)
2779{
2780 struct snd_pcm_file *pcm_file;
2781
2782 pcm_file = file->private_data;
2783
2784 if (((cmd >> 8) & 0xff) != 'A')
2785 return -ENOTTY;
2786
2787 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2788 (void __user *)arg);
2789}
2790
2791static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2792 unsigned long arg)
2793{
2794 struct snd_pcm_file *pcm_file;
2795
2796 pcm_file = file->private_data;
2797
2798 if (((cmd >> 8) & 0xff) != 'A')
2799 return -ENOTTY;
2800
2801 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2802 (void __user *)arg);
2803}
2804
2805int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2806 unsigned int cmd, void *arg)
2807{
2808 mm_segment_t fs;
2809 int result;
2810
2811 fs = snd_enter_user();
2812 switch (substream->stream) {
2813 case SNDRV_PCM_STREAM_PLAYBACK:
2814 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2815 (void __user *)arg);
2816 break;
2817 case SNDRV_PCM_STREAM_CAPTURE:
2818 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2819 (void __user *)arg);
2820 break;
2821 default:
2822 result = -EINVAL;
2823 break;
2824 }
2825 snd_leave_user(fs);
2826 return result;
2827}
2828
2829EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2830
2831static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2832 loff_t * offset)
2833{
2834 struct snd_pcm_file *pcm_file;
2835 struct snd_pcm_substream *substream;
2836 struct snd_pcm_runtime *runtime;
2837 snd_pcm_sframes_t result;
2838
2839 pcm_file = file->private_data;
2840 substream = pcm_file->substream;
2841 if (PCM_RUNTIME_CHECK(substream))
2842 return -ENXIO;
2843 runtime = substream->runtime;
2844 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2845 return -EBADFD;
2846 if (!frame_aligned(runtime, count))
2847 return -EINVAL;
2848 count = bytes_to_frames(runtime, count);
2849 result = snd_pcm_lib_read(substream, buf, count);
2850 if (result > 0)
2851 result = frames_to_bytes(runtime, result);
2852 return result;
2853}
2854
2855static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2856 size_t count, loff_t * offset)
2857{
2858 struct snd_pcm_file *pcm_file;
2859 struct snd_pcm_substream *substream;
2860 struct snd_pcm_runtime *runtime;
2861 snd_pcm_sframes_t result;
2862
2863 pcm_file = file->private_data;
2864 substream = pcm_file->substream;
2865 if (PCM_RUNTIME_CHECK(substream))
2866 return -ENXIO;
2867 runtime = substream->runtime;
2868 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2869 return -EBADFD;
2870 if (!frame_aligned(runtime, count))
2871 return -EINVAL;
2872 count = bytes_to_frames(runtime, count);
2873 result = snd_pcm_lib_write(substream, buf, count);
2874 if (result > 0)
2875 result = frames_to_bytes(runtime, result);
2876 return result;
2877}
2878
2879static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2880 unsigned long nr_segs, loff_t pos)
2881
2882{
2883 struct snd_pcm_file *pcm_file;
2884 struct snd_pcm_substream *substream;
2885 struct snd_pcm_runtime *runtime;
2886 snd_pcm_sframes_t result;
2887 unsigned long i;
2888 void __user **bufs;
2889 snd_pcm_uframes_t frames;
2890
2891 pcm_file = iocb->ki_filp->private_data;
2892 substream = pcm_file->substream;
2893 if (PCM_RUNTIME_CHECK(substream))
2894 return -ENXIO;
2895 runtime = substream->runtime;
2896 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2897 return -EBADFD;
2898 if (nr_segs > 1024 || nr_segs != runtime->channels)
2899 return -EINVAL;
2900 if (!frame_aligned(runtime, iov->iov_len))
2901 return -EINVAL;
2902 frames = bytes_to_samples(runtime, iov->iov_len);
2903 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2904 if (bufs == NULL)
2905 return -ENOMEM;
2906 for (i = 0; i < nr_segs; ++i)
2907 bufs[i] = iov[i].iov_base;
2908 result = snd_pcm_lib_readv(substream, bufs, frames);
2909 if (result > 0)
2910 result = frames_to_bytes(runtime, result);
2911 kfree(bufs);
2912 return result;
2913}
2914
2915static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2916 unsigned long nr_segs, loff_t pos)
2917{
2918 struct snd_pcm_file *pcm_file;
2919 struct snd_pcm_substream *substream;
2920 struct snd_pcm_runtime *runtime;
2921 snd_pcm_sframes_t result;
2922 unsigned long i;
2923 void __user **bufs;
2924 snd_pcm_uframes_t frames;
2925
2926 pcm_file = iocb->ki_filp->private_data;
2927 substream = pcm_file->substream;
2928 if (PCM_RUNTIME_CHECK(substream))
2929 return -ENXIO;
2930 runtime = substream->runtime;
2931 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2932 return -EBADFD;
2933 if (nr_segs > 128 || nr_segs != runtime->channels ||
2934 !frame_aligned(runtime, iov->iov_len))
2935 return -EINVAL;
2936 frames = bytes_to_samples(runtime, iov->iov_len);
2937 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2938 if (bufs == NULL)
2939 return -ENOMEM;
2940 for (i = 0; i < nr_segs; ++i)
2941 bufs[i] = iov[i].iov_base;
2942 result = snd_pcm_lib_writev(substream, bufs, frames);
2943 if (result > 0)
2944 result = frames_to_bytes(runtime, result);
2945 kfree(bufs);
2946 return result;
2947}
2948
2949static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2950{
2951 struct snd_pcm_file *pcm_file;
2952 struct snd_pcm_substream *substream;
2953 struct snd_pcm_runtime *runtime;
2954 unsigned int mask;
2955 snd_pcm_uframes_t avail;
2956
2957 pcm_file = file->private_data;
2958
2959 substream = pcm_file->substream;
2960 if (PCM_RUNTIME_CHECK(substream))
2961 return -ENXIO;
2962 runtime = substream->runtime;
2963
2964 poll_wait(file, &runtime->sleep, wait);
2965
2966 snd_pcm_stream_lock_irq(substream);
2967 avail = snd_pcm_playback_avail(runtime);
2968 switch (runtime->status->state) {
2969 case SNDRV_PCM_STATE_RUNNING:
2970 case SNDRV_PCM_STATE_PREPARED:
2971 case SNDRV_PCM_STATE_PAUSED:
2972 if (avail >= runtime->control->avail_min) {
2973 mask = POLLOUT | POLLWRNORM;
2974 break;
2975 }
2976 /* Fall through */
2977 case SNDRV_PCM_STATE_DRAINING:
2978 mask = 0;
2979 break;
2980 default:
2981 mask = POLLOUT | POLLWRNORM | POLLERR;
2982 break;
2983 }
2984 snd_pcm_stream_unlock_irq(substream);
2985 return mask;
2986}
2987
2988static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2989{
2990 struct snd_pcm_file *pcm_file;
2991 struct snd_pcm_substream *substream;
2992 struct snd_pcm_runtime *runtime;
2993 unsigned int mask;
2994 snd_pcm_uframes_t avail;
2995
2996 pcm_file = file->private_data;
2997
2998 substream = pcm_file->substream;
2999 if (PCM_RUNTIME_CHECK(substream))
3000 return -ENXIO;
3001 runtime = substream->runtime;
3002
3003 poll_wait(file, &runtime->sleep, wait);
3004
3005 snd_pcm_stream_lock_irq(substream);
3006 avail = snd_pcm_capture_avail(runtime);
3007 switch (runtime->status->state) {
3008 case SNDRV_PCM_STATE_RUNNING:
3009 case SNDRV_PCM_STATE_PREPARED:
3010 case SNDRV_PCM_STATE_PAUSED:
3011 if (avail >= runtime->control->avail_min) {
3012 mask = POLLIN | POLLRDNORM;
3013 break;
3014 }
3015 mask = 0;
3016 break;
3017 case SNDRV_PCM_STATE_DRAINING:
3018 if (avail > 0) {
3019 mask = POLLIN | POLLRDNORM;
3020 break;
3021 }
3022 /* Fall through */
3023 default:
3024 mask = POLLIN | POLLRDNORM | POLLERR;
3025 break;
3026 }
3027 snd_pcm_stream_unlock_irq(substream);
3028 return mask;
3029}
3030
3031/*
3032 * mmap support
3033 */
3034
3035/*
3036 * Only on coherent architectures, we can mmap the status and the control records
3037 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3038 */
3039#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3040/*
3041 * mmap status record
3042 */
3043static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3044 struct vm_fault *vmf)
3045{
3046 struct snd_pcm_substream *substream = area->vm_private_data;
3047 struct snd_pcm_runtime *runtime;
3048
3049 if (substream == NULL)
3050 return VM_FAULT_SIGBUS;
3051 runtime = substream->runtime;
3052 vmf->page = virt_to_page(runtime->status);
3053 get_page(vmf->page);
3054 return 0;
3055}
3056
3057static const struct vm_operations_struct snd_pcm_vm_ops_status =
3058{
3059 .fault = snd_pcm_mmap_status_fault,
3060};
3061
3062static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3063 struct vm_area_struct *area)
3064{
3065 long size;
3066 if (!(area->vm_flags & VM_READ))
3067 return -EINVAL;
3068 size = area->vm_end - area->vm_start;
3069 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3070 return -EINVAL;
3071 area->vm_ops = &snd_pcm_vm_ops_status;
3072 area->vm_private_data = substream;
3073 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3074 return 0;
3075}
3076
3077/*
3078 * mmap control record
3079 */
3080static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3081 struct vm_fault *vmf)
3082{
3083 struct snd_pcm_substream *substream = area->vm_private_data;
3084 struct snd_pcm_runtime *runtime;
3085
3086 if (substream == NULL)
3087 return VM_FAULT_SIGBUS;
3088 runtime = substream->runtime;
3089 vmf->page = virt_to_page(runtime->control);
3090 get_page(vmf->page);
3091 return 0;
3092}
3093
3094static const struct vm_operations_struct snd_pcm_vm_ops_control =
3095{
3096 .fault = snd_pcm_mmap_control_fault,
3097};
3098
3099static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3100 struct vm_area_struct *area)
3101{
3102 long size;
3103 if (!(area->vm_flags & VM_READ))
3104 return -EINVAL;
3105 size = area->vm_end - area->vm_start;
3106 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3107 return -EINVAL;
3108 area->vm_ops = &snd_pcm_vm_ops_control;
3109 area->vm_private_data = substream;
3110 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3111 return 0;
3112}
3113#else /* ! coherent mmap */
3114/*
3115 * don't support mmap for status and control records.
3116 */
3117static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3118 struct vm_area_struct *area)
3119{
3120 return -ENXIO;
3121}
3122static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3123 struct vm_area_struct *area)
3124{
3125 return -ENXIO;
3126}
3127#endif /* coherent mmap */
3128
3129static inline struct page *
3130snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3131{
3132 void *vaddr = substream->runtime->dma_area + ofs;
3133#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3134 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3135 return virt_to_page(CAC_ADDR(vaddr));
3136#endif
3137#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3138 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3139 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3140 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3141 /* assume dma_handle set via pfn_to_phys() in
3142 * mm/dma-noncoherent.c
3143 */
3144 return pfn_to_page(addr >> PAGE_SHIFT);
3145 }
3146#endif
3147 return virt_to_page(vaddr);
3148}
3149
3150/*
3151 * fault callback for mmapping a RAM page
3152 */
3153static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3154 struct vm_fault *vmf)
3155{
3156 struct snd_pcm_substream *substream = area->vm_private_data;
3157 struct snd_pcm_runtime *runtime;
3158 unsigned long offset;
3159 struct page * page;
3160 size_t dma_bytes;
3161
3162 if (substream == NULL)
3163 return VM_FAULT_SIGBUS;
3164 runtime = substream->runtime;
3165 offset = vmf->pgoff << PAGE_SHIFT;
3166 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3167 if (offset > dma_bytes - PAGE_SIZE)
3168 return VM_FAULT_SIGBUS;
3169 if (substream->ops->page)
3170 page = substream->ops->page(substream, offset);
3171 else
3172 page = snd_pcm_default_page_ops(substream, offset);
3173 if (!page)
3174 return VM_FAULT_SIGBUS;
3175 get_page(page);
3176 vmf->page = page;
3177 return 0;
3178}
3179
3180static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3181 .open = snd_pcm_mmap_data_open,
3182 .close = snd_pcm_mmap_data_close,
3183};
3184
3185static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3186 .open = snd_pcm_mmap_data_open,
3187 .close = snd_pcm_mmap_data_close,
3188 .fault = snd_pcm_mmap_data_fault,
3189};
3190
3191#ifndef ARCH_HAS_DMA_MMAP_COHERENT
3192/* This should be defined / handled globally! */
3193#ifdef CONFIG_ARM
3194#define ARCH_HAS_DMA_MMAP_COHERENT
3195#endif
3196#endif
3197
3198/*
3199 * mmap the DMA buffer on RAM
3200 */
3201int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3202 struct vm_area_struct *area)
3203{
3204 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3205#ifdef CONFIG_GENERIC_ALLOCATOR
3206 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3207 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3208 return remap_pfn_range(area, area->vm_start,
3209 substream->dma_buffer.addr >> PAGE_SHIFT,
3210 area->vm_end - area->vm_start, area->vm_page_prot);
3211 }
3212#endif /* CONFIG_GENERIC_ALLOCATOR */
3213#ifdef ARCH_HAS_DMA_MMAP_COHERENT
3214 if (!substream->ops->page &&
3215 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3216 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3217 area,
3218 substream->runtime->dma_area,
3219 substream->runtime->dma_addr,
3220 area->vm_end - area->vm_start);
3221#elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3222 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3223 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3224 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3225#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3226 /* mmap with fault handler */
3227 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3228 return 0;
3229}
3230EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3231
3232/*
3233 * mmap the DMA buffer on I/O memory area
3234 */
3235#if SNDRV_PCM_INFO_MMAP_IOMEM
3236int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3237 struct vm_area_struct *area)
3238{
3239 struct snd_pcm_runtime *runtime = substream->runtime;;
3240
3241 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3242 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3243}
3244
3245EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3246#endif /* SNDRV_PCM_INFO_MMAP */
3247
3248/*
3249 * mmap DMA buffer
3250 */
3251int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3252 struct vm_area_struct *area)
3253{
3254 struct snd_pcm_runtime *runtime;
3255 long size;
3256 unsigned long offset;
3257 size_t dma_bytes;
3258 int err;
3259
3260 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3261 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3262 return -EINVAL;
3263 } else {
3264 if (!(area->vm_flags & VM_READ))
3265 return -EINVAL;
3266 }
3267 runtime = substream->runtime;
3268 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3269 return -EBADFD;
3270 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3271 return -ENXIO;
3272 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3273 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3274 return -EINVAL;
3275 size = area->vm_end - area->vm_start;
3276 offset = area->vm_pgoff << PAGE_SHIFT;
3277 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3278 if ((size_t)size > dma_bytes)
3279 return -EINVAL;
3280 if (offset > dma_bytes - size)
3281 return -EINVAL;
3282
3283 area->vm_ops = &snd_pcm_vm_ops_data;
3284 area->vm_private_data = substream;
3285 if (substream->ops->mmap)
3286 err = substream->ops->mmap(substream, area);
3287 else
3288 err = snd_pcm_lib_default_mmap(substream, area);
3289 if (!err)
3290 atomic_inc(&substream->mmap_count);
3291 return err;
3292}
3293
3294EXPORT_SYMBOL(snd_pcm_mmap_data);
3295
3296static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3297{
3298 struct snd_pcm_file * pcm_file;
3299 struct snd_pcm_substream *substream;
3300 unsigned long offset;
3301
3302 pcm_file = file->private_data;
3303 substream = pcm_file->substream;
3304 if (PCM_RUNTIME_CHECK(substream))
3305 return -ENXIO;
3306
3307 offset = area->vm_pgoff << PAGE_SHIFT;
3308 switch (offset) {
3309 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3310 if (pcm_file->no_compat_mmap)
3311 return -ENXIO;
3312 return snd_pcm_mmap_status(substream, file, area);
3313 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3314 if (pcm_file->no_compat_mmap)
3315 return -ENXIO;
3316 return snd_pcm_mmap_control(substream, file, area);
3317 default:
3318 return snd_pcm_mmap_data(substream, file, area);
3319 }
3320 return 0;
3321}
3322
3323static int snd_pcm_fasync(int fd, struct file * file, int on)
3324{
3325 struct snd_pcm_file * pcm_file;
3326 struct snd_pcm_substream *substream;
3327 struct snd_pcm_runtime *runtime;
3328
3329 pcm_file = file->private_data;
3330 substream = pcm_file->substream;
3331 if (PCM_RUNTIME_CHECK(substream))
3332 return -ENXIO;
3333 runtime = substream->runtime;
3334 return fasync_helper(fd, file, on, &runtime->fasync);
3335}
3336
3337/*
3338 * ioctl32 compat
3339 */
3340#ifdef CONFIG_COMPAT
3341#include "pcm_compat.c"
3342#else
3343#define snd_pcm_ioctl_compat NULL
3344#endif
3345
3346/*
3347 * To be removed helpers to keep binary compatibility
3348 */
3349
3350#ifdef CONFIG_SND_SUPPORT_OLD_API
3351#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3352#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3353
3354static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3355 struct snd_pcm_hw_params_old *oparams)
3356{
3357 unsigned int i;
3358
3359 memset(params, 0, sizeof(*params));
3360 params->flags = oparams->flags;
3361 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3362 params->masks[i].bits[0] = oparams->masks[i];
3363 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3364 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3365 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3366 params->info = oparams->info;
3367 params->msbits = oparams->msbits;
3368 params->rate_num = oparams->rate_num;
3369 params->rate_den = oparams->rate_den;
3370 params->fifo_size = oparams->fifo_size;
3371}
3372
3373static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3374 struct snd_pcm_hw_params *params)
3375{
3376 unsigned int i;
3377
3378 memset(oparams, 0, sizeof(*oparams));
3379 oparams->flags = params->flags;
3380 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3381 oparams->masks[i] = params->masks[i].bits[0];
3382 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3383 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3384 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3385 oparams->info = params->info;
3386 oparams->msbits = params->msbits;
3387 oparams->rate_num = params->rate_num;
3388 oparams->rate_den = params->rate_den;
3389 oparams->fifo_size = params->fifo_size;
3390}
3391
3392static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3393 struct snd_pcm_hw_params_old __user * _oparams)
3394{
3395 struct snd_pcm_hw_params *params;
3396 struct snd_pcm_hw_params_old *oparams = NULL;
3397 int err;
3398
3399 params = kmalloc(sizeof(*params), GFP_KERNEL);
3400 if (!params)
3401 return -ENOMEM;
3402
3403 oparams = memdup_user(_oparams, sizeof(*oparams));
3404 if (IS_ERR(oparams)) {
3405 err = PTR_ERR(oparams);
3406 goto out;
3407 }
3408 snd_pcm_hw_convert_from_old_params(params, oparams);
3409 err = snd_pcm_hw_refine(substream, params);
3410 snd_pcm_hw_convert_to_old_params(oparams, params);
3411 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3412 if (!err)
3413 err = -EFAULT;
3414 }
3415
3416 kfree(oparams);
3417out:
3418 kfree(params);
3419 return err;
3420}
3421
3422static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3423 struct snd_pcm_hw_params_old __user * _oparams)
3424{
3425 struct snd_pcm_hw_params *params;
3426 struct snd_pcm_hw_params_old *oparams = NULL;
3427 int err;
3428
3429 params = kmalloc(sizeof(*params), GFP_KERNEL);
3430 if (!params)
3431 return -ENOMEM;
3432
3433 oparams = memdup_user(_oparams, sizeof(*oparams));
3434 if (IS_ERR(oparams)) {
3435 err = PTR_ERR(oparams);
3436 goto out;
3437 }
3438 snd_pcm_hw_convert_from_old_params(params, oparams);
3439 err = snd_pcm_hw_params(substream, params);
3440 snd_pcm_hw_convert_to_old_params(oparams, params);
3441 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3442 if (!err)
3443 err = -EFAULT;
3444 }
3445
3446 kfree(oparams);
3447out:
3448 kfree(params);
3449 return err;
3450}
3451#endif /* CONFIG_SND_SUPPORT_OLD_API */
3452
3453#ifndef CONFIG_MMU
3454static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3455 unsigned long addr,
3456 unsigned long len,
3457 unsigned long pgoff,
3458 unsigned long flags)
3459{
3460 struct snd_pcm_file *pcm_file = file->private_data;
3461 struct snd_pcm_substream *substream = pcm_file->substream;
3462 struct snd_pcm_runtime *runtime = substream->runtime;
3463 unsigned long offset = pgoff << PAGE_SHIFT;
3464
3465 switch (offset) {
3466 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3467 return (unsigned long)runtime->status;
3468 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3469 return (unsigned long)runtime->control;
3470 default:
3471 return (unsigned long)runtime->dma_area + offset;
3472 }
3473}
3474#else
3475# define snd_pcm_get_unmapped_area NULL
3476#endif
3477
3478/*
3479 * Register section
3480 */
3481
3482const struct file_operations snd_pcm_f_ops[2] = {
3483 {
3484 .owner = THIS_MODULE,
3485 .write = snd_pcm_write,
3486 .aio_write = snd_pcm_aio_write,
3487 .open = snd_pcm_playback_open,
3488 .release = snd_pcm_release,
3489 .llseek = no_llseek,
3490 .poll = snd_pcm_playback_poll,
3491 .unlocked_ioctl = snd_pcm_playback_ioctl,
3492 .compat_ioctl = snd_pcm_ioctl_compat,
3493 .mmap = snd_pcm_mmap,
3494 .fasync = snd_pcm_fasync,
3495 .get_unmapped_area = snd_pcm_get_unmapped_area,
3496 },
3497 {
3498 .owner = THIS_MODULE,
3499 .read = snd_pcm_read,
3500 .aio_read = snd_pcm_aio_read,
3501 .open = snd_pcm_capture_open,
3502 .release = snd_pcm_release,
3503 .llseek = no_llseek,
3504 .poll = snd_pcm_capture_poll,
3505 .unlocked_ioctl = snd_pcm_capture_ioctl,
3506 .compat_ioctl = snd_pcm_ioctl_compat,
3507 .mmap = snd_pcm_mmap,
3508 .fasync = snd_pcm_fasync,
3509 .get_unmapped_area = snd_pcm_get_unmapped_area,
3510 }
3511};