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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/sched/signal.h>
27#include <linux/time.h>
28#include <linux/pm_qos.h>
29#include <linux/io.h>
30#include <linux/dma-mapping.h>
31#include <sound/core.h>
32#include <sound/control.h>
33#include <sound/info.h>
34#include <sound/pcm.h>
35#include <sound/pcm_params.h>
36#include <sound/timer.h>
37#include <sound/minors.h>
38#include <linux/uio.h>
39
40#include "pcm_local.h"
41
42#ifdef CONFIG_SND_DEBUG
43#define CREATE_TRACE_POINTS
44#include "pcm_param_trace.h"
45#else
46#define trace_hw_mask_param_enabled() 0
47#define trace_hw_interval_param_enabled() 0
48#define trace_hw_mask_param(substream, type, index, prev, curr)
49#define trace_hw_interval_param(substream, type, index, prev, curr)
50#endif
51
52/*
53 * Compatibility
54 */
55
56struct snd_pcm_hw_params_old {
57 unsigned int flags;
58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
59 SNDRV_PCM_HW_PARAM_ACCESS + 1];
60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
62 unsigned int rmask;
63 unsigned int cmask;
64 unsigned int info;
65 unsigned int msbits;
66 unsigned int rate_num;
67 unsigned int rate_den;
68 snd_pcm_uframes_t fifo_size;
69 unsigned char reserved[64];
70};
71
72#ifdef CONFIG_SND_SUPPORT_OLD_API
73#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
74#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
75
76static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
77 struct snd_pcm_hw_params_old __user * _oparams);
78static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
79 struct snd_pcm_hw_params_old __user * _oparams);
80#endif
81static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
82
83/*
84 *
85 */
86
87static DEFINE_RWLOCK(snd_pcm_link_rwlock);
88static DECLARE_RWSEM(snd_pcm_link_rwsem);
89
90/* Writer in rwsem may block readers even during its waiting in queue,
91 * and this may lead to a deadlock when the code path takes read sem
92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to
94 * spin until it gets the lock.
95 */
96static inline void down_write_nonblock(struct rw_semaphore *lock)
97{
98 while (!down_write_trylock(lock))
99 cond_resched();
100}
101
102/**
103 * snd_pcm_stream_lock - Lock the PCM stream
104 * @substream: PCM substream
105 *
106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
107 * flag of the given substream. This also takes the global link rw lock
108 * (or rw sem), too, for avoiding the race with linked streams.
109 */
110void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
111{
112 if (substream->pcm->nonatomic) {
113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
114 mutex_lock(&substream->self_group.mutex);
115 } else {
116 read_lock(&snd_pcm_link_rwlock);
117 spin_lock(&substream->self_group.lock);
118 }
119}
120EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
121
122/**
123 * snd_pcm_stream_lock - Unlock the PCM stream
124 * @substream: PCM substream
125 *
126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
127 */
128void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
129{
130 if (substream->pcm->nonatomic) {
131 mutex_unlock(&substream->self_group.mutex);
132 up_read(&snd_pcm_link_rwsem);
133 } else {
134 spin_unlock(&substream->self_group.lock);
135 read_unlock(&snd_pcm_link_rwlock);
136 }
137}
138EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
139
140/**
141 * snd_pcm_stream_lock_irq - Lock the PCM stream
142 * @substream: PCM substream
143 *
144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
146 * as snd_pcm_stream_lock().
147 */
148void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
149{
150 if (!substream->pcm->nonatomic)
151 local_irq_disable();
152 snd_pcm_stream_lock(substream);
153}
154EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
155
156/**
157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
158 * @substream: PCM substream
159 *
160 * This is a counter-part of snd_pcm_stream_lock_irq().
161 */
162void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
163{
164 snd_pcm_stream_unlock(substream);
165 if (!substream->pcm->nonatomic)
166 local_irq_enable();
167}
168EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
169
170unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
171{
172 unsigned long flags = 0;
173 if (!substream->pcm->nonatomic)
174 local_irq_save(flags);
175 snd_pcm_stream_lock(substream);
176 return flags;
177}
178EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
179
180/**
181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
182 * @substream: PCM substream
183 * @flags: irq flags
184 *
185 * This is a counter-part of snd_pcm_stream_lock_irqsave().
186 */
187void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
188 unsigned long flags)
189{
190 snd_pcm_stream_unlock(substream);
191 if (!substream->pcm->nonatomic)
192 local_irq_restore(flags);
193}
194EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
195
196int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
197{
198 struct snd_pcm *pcm = substream->pcm;
199 struct snd_pcm_str *pstr = substream->pstr;
200
201 memset(info, 0, sizeof(*info));
202 info->card = pcm->card->number;
203 info->device = pcm->device;
204 info->stream = substream->stream;
205 info->subdevice = substream->number;
206 strlcpy(info->id, pcm->id, sizeof(info->id));
207 strlcpy(info->name, pcm->name, sizeof(info->name));
208 info->dev_class = pcm->dev_class;
209 info->dev_subclass = pcm->dev_subclass;
210 info->subdevices_count = pstr->substream_count;
211 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
212 strlcpy(info->subname, substream->name, sizeof(info->subname));
213
214 return 0;
215}
216
217int snd_pcm_info_user(struct snd_pcm_substream *substream,
218 struct snd_pcm_info __user * _info)
219{
220 struct snd_pcm_info *info;
221 int err;
222
223 info = kmalloc(sizeof(*info), GFP_KERNEL);
224 if (! info)
225 return -ENOMEM;
226 err = snd_pcm_info(substream, info);
227 if (err >= 0) {
228 if (copy_to_user(_info, info, sizeof(*info)))
229 err = -EFAULT;
230 }
231 kfree(info);
232 return err;
233}
234
235static bool hw_support_mmap(struct snd_pcm_substream *substream)
236{
237 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
238 return false;
239 /* architecture supports dma_mmap_coherent()? */
240#if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA)
241 if (!substream->ops->mmap &&
242 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
243 return false;
244#endif
245 return true;
246}
247
248static int constrain_mask_params(struct snd_pcm_substream *substream,
249 struct snd_pcm_hw_params *params)
250{
251 struct snd_pcm_hw_constraints *constrs =
252 &substream->runtime->hw_constraints;
253 struct snd_mask *m;
254 unsigned int k;
255 struct snd_mask old_mask;
256 int changed;
257
258 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
259 m = hw_param_mask(params, k);
260 if (snd_mask_empty(m))
261 return -EINVAL;
262
263 /* This parameter is not requested to change by a caller. */
264 if (!(params->rmask & (1 << k)))
265 continue;
266
267 if (trace_hw_mask_param_enabled())
268 old_mask = *m;
269
270 changed = snd_mask_refine(m, constrs_mask(constrs, k));
271 if (changed < 0)
272 return changed;
273 if (changed == 0)
274 continue;
275
276 /* Set corresponding flag so that the caller gets it. */
277 trace_hw_mask_param(substream, k, 0, &old_mask, m);
278 params->cmask |= 1 << k;
279 }
280
281 return 0;
282}
283
284static int constrain_interval_params(struct snd_pcm_substream *substream,
285 struct snd_pcm_hw_params *params)
286{
287 struct snd_pcm_hw_constraints *constrs =
288 &substream->runtime->hw_constraints;
289 struct snd_interval *i;
290 unsigned int k;
291 struct snd_interval old_interval;
292 int changed;
293
294 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
295 i = hw_param_interval(params, k);
296 if (snd_interval_empty(i))
297 return -EINVAL;
298
299 /* This parameter is not requested to change by a caller. */
300 if (!(params->rmask & (1 << k)))
301 continue;
302
303 if (trace_hw_interval_param_enabled())
304 old_interval = *i;
305
306 changed = snd_interval_refine(i, constrs_interval(constrs, k));
307 if (changed < 0)
308 return changed;
309 if (changed == 0)
310 continue;
311
312 /* Set corresponding flag so that the caller gets it. */
313 trace_hw_interval_param(substream, k, 0, &old_interval, i);
314 params->cmask |= 1 << k;
315 }
316
317 return 0;
318}
319
320static int constrain_params_by_rules(struct snd_pcm_substream *substream,
321 struct snd_pcm_hw_params *params)
322{
323 struct snd_pcm_hw_constraints *constrs =
324 &substream->runtime->hw_constraints;
325 unsigned int k;
326 unsigned int *rstamps;
327 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
328 unsigned int stamp;
329 struct snd_pcm_hw_rule *r;
330 unsigned int d;
331 struct snd_mask old_mask;
332 struct snd_interval old_interval;
333 bool again;
334 int changed, err = 0;
335
336 /*
337 * Each application of rule has own sequence number.
338 *
339 * Each member of 'rstamps' array represents the sequence number of
340 * recent application of corresponding rule.
341 */
342 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
343 if (!rstamps)
344 return -ENOMEM;
345
346 /*
347 * Each member of 'vstamps' array represents the sequence number of
348 * recent application of rule in which corresponding parameters were
349 * changed.
350 *
351 * In initial state, elements corresponding to parameters requested by
352 * a caller is 1. For unrequested parameters, corresponding members
353 * have 0 so that the parameters are never changed anymore.
354 */
355 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
356 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
357
358 /* Due to the above design, actual sequence number starts at 2. */
359 stamp = 2;
360retry:
361 /* Apply all rules in order. */
362 again = false;
363 for (k = 0; k < constrs->rules_num; k++) {
364 r = &constrs->rules[k];
365
366 /*
367 * Check condition bits of this rule. When the rule has
368 * some condition bits, parameter without the bits is
369 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
370 * is an example of the condition bits.
371 */
372 if (r->cond && !(r->cond & params->flags))
373 continue;
374
375 /*
376 * The 'deps' array includes maximum three dependencies
377 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
378 * member of this array is a sentinel and should be
379 * negative value.
380 *
381 * This rule should be processed in this time when dependent
382 * parameters were changed at former applications of the other
383 * rules.
384 */
385 for (d = 0; r->deps[d] >= 0; d++) {
386 if (vstamps[r->deps[d]] > rstamps[k])
387 break;
388 }
389 if (r->deps[d] < 0)
390 continue;
391
392 if (trace_hw_mask_param_enabled()) {
393 if (hw_is_mask(r->var))
394 old_mask = *hw_param_mask(params, r->var);
395 }
396 if (trace_hw_interval_param_enabled()) {
397 if (hw_is_interval(r->var))
398 old_interval = *hw_param_interval(params, r->var);
399 }
400
401 changed = r->func(params, r);
402 if (changed < 0) {
403 err = changed;
404 goto out;
405 }
406
407 /*
408 * When the parameter is changed, notify it to the caller
409 * by corresponding returned bit, then preparing for next
410 * iteration.
411 */
412 if (changed && r->var >= 0) {
413 if (hw_is_mask(r->var)) {
414 trace_hw_mask_param(substream, r->var,
415 k + 1, &old_mask,
416 hw_param_mask(params, r->var));
417 }
418 if (hw_is_interval(r->var)) {
419 trace_hw_interval_param(substream, r->var,
420 k + 1, &old_interval,
421 hw_param_interval(params, r->var));
422 }
423
424 params->cmask |= (1 << r->var);
425 vstamps[r->var] = stamp;
426 again = true;
427 }
428
429 rstamps[k] = stamp++;
430 }
431
432 /* Iterate to evaluate all rules till no parameters are changed. */
433 if (again)
434 goto retry;
435
436 out:
437 kfree(rstamps);
438 return err;
439}
440
441static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
442 struct snd_pcm_hw_params *params)
443{
444 const struct snd_interval *i;
445 const struct snd_mask *m;
446 int err;
447
448 if (!params->msbits) {
449 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
450 if (snd_interval_single(i))
451 params->msbits = snd_interval_value(i);
452 }
453
454 if (!params->rate_den) {
455 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
456 if (snd_interval_single(i)) {
457 params->rate_num = snd_interval_value(i);
458 params->rate_den = 1;
459 }
460 }
461
462 if (!params->fifo_size) {
463 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
464 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
465 if (snd_mask_single(m) && snd_interval_single(i)) {
466 err = substream->ops->ioctl(substream,
467 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
468 if (err < 0)
469 return err;
470 }
471 }
472
473 if (!params->info) {
474 params->info = substream->runtime->hw.info;
475 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
476 SNDRV_PCM_INFO_DRAIN_TRIGGER);
477 if (!hw_support_mmap(substream))
478 params->info &= ~(SNDRV_PCM_INFO_MMAP |
479 SNDRV_PCM_INFO_MMAP_VALID);
480 }
481
482 return 0;
483}
484
485int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
486 struct snd_pcm_hw_params *params)
487{
488 int err;
489
490 params->info = 0;
491 params->fifo_size = 0;
492 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
493 params->msbits = 0;
494 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
495 params->rate_num = 0;
496 params->rate_den = 0;
497 }
498
499 err = constrain_mask_params(substream, params);
500 if (err < 0)
501 return err;
502
503 err = constrain_interval_params(substream, params);
504 if (err < 0)
505 return err;
506
507 err = constrain_params_by_rules(substream, params);
508 if (err < 0)
509 return err;
510
511 params->rmask = 0;
512
513 return 0;
514}
515EXPORT_SYMBOL(snd_pcm_hw_refine);
516
517static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
518 struct snd_pcm_hw_params __user * _params)
519{
520 struct snd_pcm_hw_params *params;
521 int err;
522
523 params = memdup_user(_params, sizeof(*params));
524 if (IS_ERR(params))
525 return PTR_ERR(params);
526
527 err = snd_pcm_hw_refine(substream, params);
528 if (err < 0)
529 goto end;
530
531 err = fixup_unreferenced_params(substream, params);
532 if (err < 0)
533 goto end;
534
535 if (copy_to_user(_params, params, sizeof(*params)))
536 err = -EFAULT;
537end:
538 kfree(params);
539 return err;
540}
541
542static int period_to_usecs(struct snd_pcm_runtime *runtime)
543{
544 int usecs;
545
546 if (! runtime->rate)
547 return -1; /* invalid */
548
549 /* take 75% of period time as the deadline */
550 usecs = (750000 / runtime->rate) * runtime->period_size;
551 usecs += ((750000 % runtime->rate) * runtime->period_size) /
552 runtime->rate;
553
554 return usecs;
555}
556
557static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
558{
559 snd_pcm_stream_lock_irq(substream);
560 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
561 substream->runtime->status->state = state;
562 snd_pcm_stream_unlock_irq(substream);
563}
564
565static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
566 int event)
567{
568#ifdef CONFIG_SND_PCM_TIMER
569 if (substream->timer)
570 snd_timer_notify(substream->timer, event,
571 &substream->runtime->trigger_tstamp);
572#endif
573}
574
575/**
576 * snd_pcm_hw_param_choose - choose a configuration defined by @params
577 * @pcm: PCM instance
578 * @params: the hw_params instance
579 *
580 * Choose one configuration from configuration space defined by @params.
581 * The configuration chosen is that obtained fixing in this order:
582 * first access, first format, first subformat, min channels,
583 * min rate, min period time, max buffer size, min tick time
584 *
585 * Return: Zero if successful, or a negative error code on failure.
586 */
587static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
588 struct snd_pcm_hw_params *params)
589{
590 static const int vars[] = {
591 SNDRV_PCM_HW_PARAM_ACCESS,
592 SNDRV_PCM_HW_PARAM_FORMAT,
593 SNDRV_PCM_HW_PARAM_SUBFORMAT,
594 SNDRV_PCM_HW_PARAM_CHANNELS,
595 SNDRV_PCM_HW_PARAM_RATE,
596 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
597 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
598 SNDRV_PCM_HW_PARAM_TICK_TIME,
599 -1
600 };
601 const int *v;
602 struct snd_mask old_mask;
603 struct snd_interval old_interval;
604 int changed;
605
606 for (v = vars; *v != -1; v++) {
607 /* Keep old parameter to trace. */
608 if (trace_hw_mask_param_enabled()) {
609 if (hw_is_mask(*v))
610 old_mask = *hw_param_mask(params, *v);
611 }
612 if (trace_hw_interval_param_enabled()) {
613 if (hw_is_interval(*v))
614 old_interval = *hw_param_interval(params, *v);
615 }
616 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
617 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
618 else
619 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
620 if (changed < 0)
621 return changed;
622 if (changed == 0)
623 continue;
624
625 /* Trace the changed parameter. */
626 if (hw_is_mask(*v)) {
627 trace_hw_mask_param(pcm, *v, 0, &old_mask,
628 hw_param_mask(params, *v));
629 }
630 if (hw_is_interval(*v)) {
631 trace_hw_interval_param(pcm, *v, 0, &old_interval,
632 hw_param_interval(params, *v));
633 }
634 }
635
636 return 0;
637}
638
639static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
640 struct snd_pcm_hw_params *params)
641{
642 struct snd_pcm_runtime *runtime;
643 int err, usecs;
644 unsigned int bits;
645 snd_pcm_uframes_t frames;
646
647 if (PCM_RUNTIME_CHECK(substream))
648 return -ENXIO;
649 runtime = substream->runtime;
650 snd_pcm_stream_lock_irq(substream);
651 switch (runtime->status->state) {
652 case SNDRV_PCM_STATE_OPEN:
653 case SNDRV_PCM_STATE_SETUP:
654 case SNDRV_PCM_STATE_PREPARED:
655 break;
656 default:
657 snd_pcm_stream_unlock_irq(substream);
658 return -EBADFD;
659 }
660 snd_pcm_stream_unlock_irq(substream);
661#if IS_ENABLED(CONFIG_SND_PCM_OSS)
662 if (!substream->oss.oss)
663#endif
664 if (atomic_read(&substream->mmap_count))
665 return -EBADFD;
666
667 params->rmask = ~0U;
668 err = snd_pcm_hw_refine(substream, params);
669 if (err < 0)
670 goto _error;
671
672 err = snd_pcm_hw_params_choose(substream, params);
673 if (err < 0)
674 goto _error;
675
676 err = fixup_unreferenced_params(substream, params);
677 if (err < 0)
678 goto _error;
679
680 if (substream->ops->hw_params != NULL) {
681 err = substream->ops->hw_params(substream, params);
682 if (err < 0)
683 goto _error;
684 }
685
686 runtime->access = params_access(params);
687 runtime->format = params_format(params);
688 runtime->subformat = params_subformat(params);
689 runtime->channels = params_channels(params);
690 runtime->rate = params_rate(params);
691 runtime->period_size = params_period_size(params);
692 runtime->periods = params_periods(params);
693 runtime->buffer_size = params_buffer_size(params);
694 runtime->info = params->info;
695 runtime->rate_num = params->rate_num;
696 runtime->rate_den = params->rate_den;
697 runtime->no_period_wakeup =
698 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
699 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
700
701 bits = snd_pcm_format_physical_width(runtime->format);
702 runtime->sample_bits = bits;
703 bits *= runtime->channels;
704 runtime->frame_bits = bits;
705 frames = 1;
706 while (bits % 8 != 0) {
707 bits *= 2;
708 frames *= 2;
709 }
710 runtime->byte_align = bits / 8;
711 runtime->min_align = frames;
712
713 /* Default sw params */
714 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
715 runtime->period_step = 1;
716 runtime->control->avail_min = runtime->period_size;
717 runtime->start_threshold = 1;
718 runtime->stop_threshold = runtime->buffer_size;
719 runtime->silence_threshold = 0;
720 runtime->silence_size = 0;
721 runtime->boundary = runtime->buffer_size;
722 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
723 runtime->boundary *= 2;
724
725 snd_pcm_timer_resolution_change(substream);
726 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
727
728 if (pm_qos_request_active(&substream->latency_pm_qos_req))
729 pm_qos_remove_request(&substream->latency_pm_qos_req);
730 if ((usecs = period_to_usecs(runtime)) >= 0)
731 pm_qos_add_request(&substream->latency_pm_qos_req,
732 PM_QOS_CPU_DMA_LATENCY, usecs);
733 return 0;
734 _error:
735 /* hardware might be unusable from this time,
736 so we force application to retry to set
737 the correct hardware parameter settings */
738 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
739 if (substream->ops->hw_free != NULL)
740 substream->ops->hw_free(substream);
741 return err;
742}
743
744static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
745 struct snd_pcm_hw_params __user * _params)
746{
747 struct snd_pcm_hw_params *params;
748 int err;
749
750 params = memdup_user(_params, sizeof(*params));
751 if (IS_ERR(params))
752 return PTR_ERR(params);
753
754 err = snd_pcm_hw_params(substream, params);
755 if (err < 0)
756 goto end;
757
758 if (copy_to_user(_params, params, sizeof(*params)))
759 err = -EFAULT;
760end:
761 kfree(params);
762 return err;
763}
764
765static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
766{
767 struct snd_pcm_runtime *runtime;
768 int result = 0;
769
770 if (PCM_RUNTIME_CHECK(substream))
771 return -ENXIO;
772 runtime = substream->runtime;
773 snd_pcm_stream_lock_irq(substream);
774 switch (runtime->status->state) {
775 case SNDRV_PCM_STATE_SETUP:
776 case SNDRV_PCM_STATE_PREPARED:
777 break;
778 default:
779 snd_pcm_stream_unlock_irq(substream);
780 return -EBADFD;
781 }
782 snd_pcm_stream_unlock_irq(substream);
783 if (atomic_read(&substream->mmap_count))
784 return -EBADFD;
785 if (substream->ops->hw_free)
786 result = substream->ops->hw_free(substream);
787 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
788 pm_qos_remove_request(&substream->latency_pm_qos_req);
789 return result;
790}
791
792static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
793 struct snd_pcm_sw_params *params)
794{
795 struct snd_pcm_runtime *runtime;
796 int err;
797
798 if (PCM_RUNTIME_CHECK(substream))
799 return -ENXIO;
800 runtime = substream->runtime;
801 snd_pcm_stream_lock_irq(substream);
802 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
803 snd_pcm_stream_unlock_irq(substream);
804 return -EBADFD;
805 }
806 snd_pcm_stream_unlock_irq(substream);
807
808 if (params->tstamp_mode < 0 ||
809 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
810 return -EINVAL;
811 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
812 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
813 return -EINVAL;
814 if (params->avail_min == 0)
815 return -EINVAL;
816 if (params->silence_size >= runtime->boundary) {
817 if (params->silence_threshold != 0)
818 return -EINVAL;
819 } else {
820 if (params->silence_size > params->silence_threshold)
821 return -EINVAL;
822 if (params->silence_threshold > runtime->buffer_size)
823 return -EINVAL;
824 }
825 err = 0;
826 snd_pcm_stream_lock_irq(substream);
827 runtime->tstamp_mode = params->tstamp_mode;
828 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
829 runtime->tstamp_type = params->tstamp_type;
830 runtime->period_step = params->period_step;
831 runtime->control->avail_min = params->avail_min;
832 runtime->start_threshold = params->start_threshold;
833 runtime->stop_threshold = params->stop_threshold;
834 runtime->silence_threshold = params->silence_threshold;
835 runtime->silence_size = params->silence_size;
836 params->boundary = runtime->boundary;
837 if (snd_pcm_running(substream)) {
838 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
839 runtime->silence_size > 0)
840 snd_pcm_playback_silence(substream, ULONG_MAX);
841 err = snd_pcm_update_state(substream, runtime);
842 }
843 snd_pcm_stream_unlock_irq(substream);
844 return err;
845}
846
847static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
848 struct snd_pcm_sw_params __user * _params)
849{
850 struct snd_pcm_sw_params params;
851 int err;
852 if (copy_from_user(¶ms, _params, sizeof(params)))
853 return -EFAULT;
854 err = snd_pcm_sw_params(substream, ¶ms);
855 if (copy_to_user(_params, ¶ms, sizeof(params)))
856 return -EFAULT;
857 return err;
858}
859
860int snd_pcm_status(struct snd_pcm_substream *substream,
861 struct snd_pcm_status *status)
862{
863 struct snd_pcm_runtime *runtime = substream->runtime;
864
865 snd_pcm_stream_lock_irq(substream);
866
867 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
868 &runtime->audio_tstamp_config);
869
870 /* backwards compatible behavior */
871 if (runtime->audio_tstamp_config.type_requested ==
872 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
873 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
874 runtime->audio_tstamp_config.type_requested =
875 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
876 else
877 runtime->audio_tstamp_config.type_requested =
878 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
879 runtime->audio_tstamp_report.valid = 0;
880 } else
881 runtime->audio_tstamp_report.valid = 1;
882
883 status->state = runtime->status->state;
884 status->suspended_state = runtime->status->suspended_state;
885 if (status->state == SNDRV_PCM_STATE_OPEN)
886 goto _end;
887 status->trigger_tstamp = runtime->trigger_tstamp;
888 if (snd_pcm_running(substream)) {
889 snd_pcm_update_hw_ptr(substream);
890 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
891 status->tstamp = runtime->status->tstamp;
892 status->driver_tstamp = runtime->driver_tstamp;
893 status->audio_tstamp =
894 runtime->status->audio_tstamp;
895 if (runtime->audio_tstamp_report.valid == 1)
896 /* backwards compatibility, no report provided in COMPAT mode */
897 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
898 &status->audio_tstamp_accuracy,
899 &runtime->audio_tstamp_report);
900
901 goto _tstamp_end;
902 }
903 } else {
904 /* get tstamp only in fallback mode and only if enabled */
905 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
906 snd_pcm_gettime(runtime, &status->tstamp);
907 }
908 _tstamp_end:
909 status->appl_ptr = runtime->control->appl_ptr;
910 status->hw_ptr = runtime->status->hw_ptr;
911 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
912 status->avail = snd_pcm_playback_avail(runtime);
913 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
914 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
915 status->delay = runtime->buffer_size - status->avail;
916 status->delay += runtime->delay;
917 } else
918 status->delay = 0;
919 } else {
920 status->avail = snd_pcm_capture_avail(runtime);
921 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
922 status->delay = status->avail + runtime->delay;
923 else
924 status->delay = 0;
925 }
926 status->avail_max = runtime->avail_max;
927 status->overrange = runtime->overrange;
928 runtime->avail_max = 0;
929 runtime->overrange = 0;
930 _end:
931 snd_pcm_stream_unlock_irq(substream);
932 return 0;
933}
934
935static int snd_pcm_status_user(struct snd_pcm_substream *substream,
936 struct snd_pcm_status __user * _status,
937 bool ext)
938{
939 struct snd_pcm_status status;
940 int res;
941
942 memset(&status, 0, sizeof(status));
943 /*
944 * with extension, parameters are read/write,
945 * get audio_tstamp_data from user,
946 * ignore rest of status structure
947 */
948 if (ext && get_user(status.audio_tstamp_data,
949 (u32 __user *)(&_status->audio_tstamp_data)))
950 return -EFAULT;
951 res = snd_pcm_status(substream, &status);
952 if (res < 0)
953 return res;
954 if (copy_to_user(_status, &status, sizeof(status)))
955 return -EFAULT;
956 return 0;
957}
958
959static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
960 struct snd_pcm_channel_info * info)
961{
962 struct snd_pcm_runtime *runtime;
963 unsigned int channel;
964
965 channel = info->channel;
966 runtime = substream->runtime;
967 snd_pcm_stream_lock_irq(substream);
968 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
969 snd_pcm_stream_unlock_irq(substream);
970 return -EBADFD;
971 }
972 snd_pcm_stream_unlock_irq(substream);
973 if (channel >= runtime->channels)
974 return -EINVAL;
975 memset(info, 0, sizeof(*info));
976 info->channel = channel;
977 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
978}
979
980static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
981 struct snd_pcm_channel_info __user * _info)
982{
983 struct snd_pcm_channel_info info;
984 int res;
985
986 if (copy_from_user(&info, _info, sizeof(info)))
987 return -EFAULT;
988 res = snd_pcm_channel_info(substream, &info);
989 if (res < 0)
990 return res;
991 if (copy_to_user(_info, &info, sizeof(info)))
992 return -EFAULT;
993 return 0;
994}
995
996static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
997{
998 struct snd_pcm_runtime *runtime = substream->runtime;
999 if (runtime->trigger_master == NULL)
1000 return;
1001 if (runtime->trigger_master == substream) {
1002 if (!runtime->trigger_tstamp_latched)
1003 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1004 } else {
1005 snd_pcm_trigger_tstamp(runtime->trigger_master);
1006 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1007 }
1008 runtime->trigger_master = NULL;
1009}
1010
1011struct action_ops {
1012 int (*pre_action)(struct snd_pcm_substream *substream, int state);
1013 int (*do_action)(struct snd_pcm_substream *substream, int state);
1014 void (*undo_action)(struct snd_pcm_substream *substream, int state);
1015 void (*post_action)(struct snd_pcm_substream *substream, int state);
1016};
1017
1018/*
1019 * this functions is core for handling of linked stream
1020 * Note: the stream state might be changed also on failure
1021 * Note2: call with calling stream lock + link lock
1022 */
1023static int snd_pcm_action_group(const struct action_ops *ops,
1024 struct snd_pcm_substream *substream,
1025 int state, int do_lock)
1026{
1027 struct snd_pcm_substream *s = NULL;
1028 struct snd_pcm_substream *s1;
1029 int res = 0, depth = 1;
1030
1031 snd_pcm_group_for_each_entry(s, substream) {
1032 if (do_lock && s != substream) {
1033 if (s->pcm->nonatomic)
1034 mutex_lock_nested(&s->self_group.mutex, depth);
1035 else
1036 spin_lock_nested(&s->self_group.lock, depth);
1037 depth++;
1038 }
1039 res = ops->pre_action(s, state);
1040 if (res < 0)
1041 goto _unlock;
1042 }
1043 snd_pcm_group_for_each_entry(s, substream) {
1044 res = ops->do_action(s, state);
1045 if (res < 0) {
1046 if (ops->undo_action) {
1047 snd_pcm_group_for_each_entry(s1, substream) {
1048 if (s1 == s) /* failed stream */
1049 break;
1050 ops->undo_action(s1, state);
1051 }
1052 }
1053 s = NULL; /* unlock all */
1054 goto _unlock;
1055 }
1056 }
1057 snd_pcm_group_for_each_entry(s, substream) {
1058 ops->post_action(s, state);
1059 }
1060 _unlock:
1061 if (do_lock) {
1062 /* unlock streams */
1063 snd_pcm_group_for_each_entry(s1, substream) {
1064 if (s1 != substream) {
1065 if (s1->pcm->nonatomic)
1066 mutex_unlock(&s1->self_group.mutex);
1067 else
1068 spin_unlock(&s1->self_group.lock);
1069 }
1070 if (s1 == s) /* end */
1071 break;
1072 }
1073 }
1074 return res;
1075}
1076
1077/*
1078 * Note: call with stream lock
1079 */
1080static int snd_pcm_action_single(const struct action_ops *ops,
1081 struct snd_pcm_substream *substream,
1082 int state)
1083{
1084 int res;
1085
1086 res = ops->pre_action(substream, state);
1087 if (res < 0)
1088 return res;
1089 res = ops->do_action(substream, state);
1090 if (res == 0)
1091 ops->post_action(substream, state);
1092 else if (ops->undo_action)
1093 ops->undo_action(substream, state);
1094 return res;
1095}
1096
1097/*
1098 * Note: call with stream lock
1099 */
1100static int snd_pcm_action(const struct action_ops *ops,
1101 struct snd_pcm_substream *substream,
1102 int state)
1103{
1104 int res;
1105
1106 if (!snd_pcm_stream_linked(substream))
1107 return snd_pcm_action_single(ops, substream, state);
1108
1109 if (substream->pcm->nonatomic) {
1110 if (!mutex_trylock(&substream->group->mutex)) {
1111 mutex_unlock(&substream->self_group.mutex);
1112 mutex_lock(&substream->group->mutex);
1113 mutex_lock(&substream->self_group.mutex);
1114 }
1115 res = snd_pcm_action_group(ops, substream, state, 1);
1116 mutex_unlock(&substream->group->mutex);
1117 } else {
1118 if (!spin_trylock(&substream->group->lock)) {
1119 spin_unlock(&substream->self_group.lock);
1120 spin_lock(&substream->group->lock);
1121 spin_lock(&substream->self_group.lock);
1122 }
1123 res = snd_pcm_action_group(ops, substream, state, 1);
1124 spin_unlock(&substream->group->lock);
1125 }
1126 return res;
1127}
1128
1129/*
1130 * Note: don't use any locks before
1131 */
1132static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1133 struct snd_pcm_substream *substream,
1134 int state)
1135{
1136 int res;
1137
1138 snd_pcm_stream_lock_irq(substream);
1139 res = snd_pcm_action(ops, substream, state);
1140 snd_pcm_stream_unlock_irq(substream);
1141 return res;
1142}
1143
1144/*
1145 */
1146static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1147 struct snd_pcm_substream *substream,
1148 int state)
1149{
1150 int res;
1151
1152 down_read(&snd_pcm_link_rwsem);
1153 if (snd_pcm_stream_linked(substream))
1154 res = snd_pcm_action_group(ops, substream, state, 0);
1155 else
1156 res = snd_pcm_action_single(ops, substream, state);
1157 up_read(&snd_pcm_link_rwsem);
1158 return res;
1159}
1160
1161/*
1162 * start callbacks
1163 */
1164static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1165{
1166 struct snd_pcm_runtime *runtime = substream->runtime;
1167 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1168 return -EBADFD;
1169 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1170 !snd_pcm_playback_data(substream))
1171 return -EPIPE;
1172 runtime->trigger_tstamp_latched = false;
1173 runtime->trigger_master = substream;
1174 return 0;
1175}
1176
1177static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1178{
1179 if (substream->runtime->trigger_master != substream)
1180 return 0;
1181 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1182}
1183
1184static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1185{
1186 if (substream->runtime->trigger_master == substream)
1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1188}
1189
1190static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1191{
1192 struct snd_pcm_runtime *runtime = substream->runtime;
1193 snd_pcm_trigger_tstamp(substream);
1194 runtime->hw_ptr_jiffies = jiffies;
1195 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1196 runtime->rate;
1197 runtime->status->state = state;
1198 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1199 runtime->silence_size > 0)
1200 snd_pcm_playback_silence(substream, ULONG_MAX);
1201 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1202}
1203
1204static const struct action_ops snd_pcm_action_start = {
1205 .pre_action = snd_pcm_pre_start,
1206 .do_action = snd_pcm_do_start,
1207 .undo_action = snd_pcm_undo_start,
1208 .post_action = snd_pcm_post_start
1209};
1210
1211/**
1212 * snd_pcm_start - start all linked streams
1213 * @substream: the PCM substream instance
1214 *
1215 * Return: Zero if successful, or a negative error code.
1216 * The stream lock must be acquired before calling this function.
1217 */
1218int snd_pcm_start(struct snd_pcm_substream *substream)
1219{
1220 return snd_pcm_action(&snd_pcm_action_start, substream,
1221 SNDRV_PCM_STATE_RUNNING);
1222}
1223
1224/* take the stream lock and start the streams */
1225static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1226{
1227 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1228 SNDRV_PCM_STATE_RUNNING);
1229}
1230
1231/*
1232 * stop callbacks
1233 */
1234static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1235{
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1238 return -EBADFD;
1239 runtime->trigger_master = substream;
1240 return 0;
1241}
1242
1243static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1244{
1245 if (substream->runtime->trigger_master == substream &&
1246 snd_pcm_running(substream))
1247 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1248 return 0; /* unconditonally stop all substreams */
1249}
1250
1251static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1252{
1253 struct snd_pcm_runtime *runtime = substream->runtime;
1254 if (runtime->status->state != state) {
1255 snd_pcm_trigger_tstamp(substream);
1256 runtime->status->state = state;
1257 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1258 }
1259 wake_up(&runtime->sleep);
1260 wake_up(&runtime->tsleep);
1261}
1262
1263static const struct action_ops snd_pcm_action_stop = {
1264 .pre_action = snd_pcm_pre_stop,
1265 .do_action = snd_pcm_do_stop,
1266 .post_action = snd_pcm_post_stop
1267};
1268
1269/**
1270 * snd_pcm_stop - try to stop all running streams in the substream group
1271 * @substream: the PCM substream instance
1272 * @state: PCM state after stopping the stream
1273 *
1274 * The state of each stream is then changed to the given state unconditionally.
1275 *
1276 * Return: Zero if successful, or a negative error code.
1277 */
1278int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1279{
1280 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1281}
1282EXPORT_SYMBOL(snd_pcm_stop);
1283
1284/**
1285 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1286 * @substream: the PCM substream
1287 *
1288 * After stopping, the state is changed to SETUP.
1289 * Unlike snd_pcm_stop(), this affects only the given stream.
1290 *
1291 * Return: Zero if succesful, or a negative error code.
1292 */
1293int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1294{
1295 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1296 SNDRV_PCM_STATE_SETUP);
1297}
1298
1299/**
1300 * snd_pcm_stop_xrun - stop the running streams as XRUN
1301 * @substream: the PCM substream instance
1302 *
1303 * This stops the given running substream (and all linked substreams) as XRUN.
1304 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1305 *
1306 * Return: Zero if successful, or a negative error code.
1307 */
1308int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1309{
1310 unsigned long flags;
1311 int ret = 0;
1312
1313 snd_pcm_stream_lock_irqsave(substream, flags);
1314 if (snd_pcm_running(substream))
1315 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1316 snd_pcm_stream_unlock_irqrestore(substream, flags);
1317 return ret;
1318}
1319EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1320
1321/*
1322 * pause callbacks
1323 */
1324static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1325{
1326 struct snd_pcm_runtime *runtime = substream->runtime;
1327 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1328 return -ENOSYS;
1329 if (push) {
1330 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1331 return -EBADFD;
1332 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1333 return -EBADFD;
1334 runtime->trigger_master = substream;
1335 return 0;
1336}
1337
1338static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1339{
1340 if (substream->runtime->trigger_master != substream)
1341 return 0;
1342 /* some drivers might use hw_ptr to recover from the pause -
1343 update the hw_ptr now */
1344 if (push)
1345 snd_pcm_update_hw_ptr(substream);
1346 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1347 * a delta between the current jiffies, this gives a large enough
1348 * delta, effectively to skip the check once.
1349 */
1350 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1351 return substream->ops->trigger(substream,
1352 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1353 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1354}
1355
1356static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1357{
1358 if (substream->runtime->trigger_master == substream)
1359 substream->ops->trigger(substream,
1360 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1361 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1362}
1363
1364static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1365{
1366 struct snd_pcm_runtime *runtime = substream->runtime;
1367 snd_pcm_trigger_tstamp(substream);
1368 if (push) {
1369 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1370 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1371 wake_up(&runtime->sleep);
1372 wake_up(&runtime->tsleep);
1373 } else {
1374 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1375 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1376 }
1377}
1378
1379static const struct action_ops snd_pcm_action_pause = {
1380 .pre_action = snd_pcm_pre_pause,
1381 .do_action = snd_pcm_do_pause,
1382 .undo_action = snd_pcm_undo_pause,
1383 .post_action = snd_pcm_post_pause
1384};
1385
1386/*
1387 * Push/release the pause for all linked streams.
1388 */
1389static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1390{
1391 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1392}
1393
1394#ifdef CONFIG_PM
1395/* suspend */
1396
1397static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1398{
1399 struct snd_pcm_runtime *runtime = substream->runtime;
1400 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1401 return -EBUSY;
1402 runtime->trigger_master = substream;
1403 return 0;
1404}
1405
1406static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1407{
1408 struct snd_pcm_runtime *runtime = substream->runtime;
1409 if (runtime->trigger_master != substream)
1410 return 0;
1411 if (! snd_pcm_running(substream))
1412 return 0;
1413 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1414 return 0; /* suspend unconditionally */
1415}
1416
1417static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1418{
1419 struct snd_pcm_runtime *runtime = substream->runtime;
1420 snd_pcm_trigger_tstamp(substream);
1421 runtime->status->suspended_state = runtime->status->state;
1422 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1423 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1424 wake_up(&runtime->sleep);
1425 wake_up(&runtime->tsleep);
1426}
1427
1428static const struct action_ops snd_pcm_action_suspend = {
1429 .pre_action = snd_pcm_pre_suspend,
1430 .do_action = snd_pcm_do_suspend,
1431 .post_action = snd_pcm_post_suspend
1432};
1433
1434/**
1435 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1436 * @substream: the PCM substream
1437 *
1438 * After this call, all streams are changed to SUSPENDED state.
1439 *
1440 * Return: Zero if successful (or @substream is %NULL), or a negative error
1441 * code.
1442 */
1443int snd_pcm_suspend(struct snd_pcm_substream *substream)
1444{
1445 int err;
1446 unsigned long flags;
1447
1448 if (! substream)
1449 return 0;
1450
1451 snd_pcm_stream_lock_irqsave(substream, flags);
1452 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1453 snd_pcm_stream_unlock_irqrestore(substream, flags);
1454 return err;
1455}
1456EXPORT_SYMBOL(snd_pcm_suspend);
1457
1458/**
1459 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1460 * @pcm: the PCM instance
1461 *
1462 * After this call, all streams are changed to SUSPENDED state.
1463 *
1464 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1465 */
1466int snd_pcm_suspend_all(struct snd_pcm *pcm)
1467{
1468 struct snd_pcm_substream *substream;
1469 int stream, err = 0;
1470
1471 if (! pcm)
1472 return 0;
1473
1474 for (stream = 0; stream < 2; stream++) {
1475 for (substream = pcm->streams[stream].substream;
1476 substream; substream = substream->next) {
1477 /* FIXME: the open/close code should lock this as well */
1478 if (substream->runtime == NULL)
1479 continue;
1480 err = snd_pcm_suspend(substream);
1481 if (err < 0 && err != -EBUSY)
1482 return err;
1483 }
1484 }
1485 return 0;
1486}
1487EXPORT_SYMBOL(snd_pcm_suspend_all);
1488
1489/* resume */
1490
1491static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1492{
1493 struct snd_pcm_runtime *runtime = substream->runtime;
1494 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1495 return -ENOSYS;
1496 runtime->trigger_master = substream;
1497 return 0;
1498}
1499
1500static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1501{
1502 struct snd_pcm_runtime *runtime = substream->runtime;
1503 if (runtime->trigger_master != substream)
1504 return 0;
1505 /* DMA not running previously? */
1506 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1507 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1508 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1509 return 0;
1510 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1511}
1512
1513static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1514{
1515 if (substream->runtime->trigger_master == substream &&
1516 snd_pcm_running(substream))
1517 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1518}
1519
1520static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1521{
1522 struct snd_pcm_runtime *runtime = substream->runtime;
1523 snd_pcm_trigger_tstamp(substream);
1524 runtime->status->state = runtime->status->suspended_state;
1525 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1526}
1527
1528static const struct action_ops snd_pcm_action_resume = {
1529 .pre_action = snd_pcm_pre_resume,
1530 .do_action = snd_pcm_do_resume,
1531 .undo_action = snd_pcm_undo_resume,
1532 .post_action = snd_pcm_post_resume
1533};
1534
1535static int snd_pcm_resume(struct snd_pcm_substream *substream)
1536{
1537 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1538}
1539
1540#else
1541
1542static int snd_pcm_resume(struct snd_pcm_substream *substream)
1543{
1544 return -ENOSYS;
1545}
1546
1547#endif /* CONFIG_PM */
1548
1549/*
1550 * xrun ioctl
1551 *
1552 * Change the RUNNING stream(s) to XRUN state.
1553 */
1554static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1555{
1556 struct snd_pcm_runtime *runtime = substream->runtime;
1557 int result;
1558
1559 snd_pcm_stream_lock_irq(substream);
1560 switch (runtime->status->state) {
1561 case SNDRV_PCM_STATE_XRUN:
1562 result = 0; /* already there */
1563 break;
1564 case SNDRV_PCM_STATE_RUNNING:
1565 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1566 break;
1567 default:
1568 result = -EBADFD;
1569 }
1570 snd_pcm_stream_unlock_irq(substream);
1571 return result;
1572}
1573
1574/*
1575 * reset ioctl
1576 */
1577static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1578{
1579 struct snd_pcm_runtime *runtime = substream->runtime;
1580 switch (runtime->status->state) {
1581 case SNDRV_PCM_STATE_RUNNING:
1582 case SNDRV_PCM_STATE_PREPARED:
1583 case SNDRV_PCM_STATE_PAUSED:
1584 case SNDRV_PCM_STATE_SUSPENDED:
1585 return 0;
1586 default:
1587 return -EBADFD;
1588 }
1589}
1590
1591static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1592{
1593 struct snd_pcm_runtime *runtime = substream->runtime;
1594 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1595 if (err < 0)
1596 return err;
1597 runtime->hw_ptr_base = 0;
1598 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1599 runtime->status->hw_ptr % runtime->period_size;
1600 runtime->silence_start = runtime->status->hw_ptr;
1601 runtime->silence_filled = 0;
1602 return 0;
1603}
1604
1605static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1606{
1607 struct snd_pcm_runtime *runtime = substream->runtime;
1608 runtime->control->appl_ptr = runtime->status->hw_ptr;
1609 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1610 runtime->silence_size > 0)
1611 snd_pcm_playback_silence(substream, ULONG_MAX);
1612}
1613
1614static const struct action_ops snd_pcm_action_reset = {
1615 .pre_action = snd_pcm_pre_reset,
1616 .do_action = snd_pcm_do_reset,
1617 .post_action = snd_pcm_post_reset
1618};
1619
1620static int snd_pcm_reset(struct snd_pcm_substream *substream)
1621{
1622 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1623}
1624
1625/*
1626 * prepare ioctl
1627 */
1628/* we use the second argument for updating f_flags */
1629static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1630 int f_flags)
1631{
1632 struct snd_pcm_runtime *runtime = substream->runtime;
1633 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1634 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1635 return -EBADFD;
1636 if (snd_pcm_running(substream))
1637 return -EBUSY;
1638 substream->f_flags = f_flags;
1639 return 0;
1640}
1641
1642static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1643{
1644 int err;
1645 err = substream->ops->prepare(substream);
1646 if (err < 0)
1647 return err;
1648 return snd_pcm_do_reset(substream, 0);
1649}
1650
1651static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1652{
1653 struct snd_pcm_runtime *runtime = substream->runtime;
1654 runtime->control->appl_ptr = runtime->status->hw_ptr;
1655 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1656}
1657
1658static const struct action_ops snd_pcm_action_prepare = {
1659 .pre_action = snd_pcm_pre_prepare,
1660 .do_action = snd_pcm_do_prepare,
1661 .post_action = snd_pcm_post_prepare
1662};
1663
1664/**
1665 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1666 * @substream: the PCM substream instance
1667 * @file: file to refer f_flags
1668 *
1669 * Return: Zero if successful, or a negative error code.
1670 */
1671static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1672 struct file *file)
1673{
1674 int f_flags;
1675
1676 if (file)
1677 f_flags = file->f_flags;
1678 else
1679 f_flags = substream->f_flags;
1680
1681 snd_pcm_stream_lock_irq(substream);
1682 switch (substream->runtime->status->state) {
1683 case SNDRV_PCM_STATE_PAUSED:
1684 snd_pcm_pause(substream, 0);
1685 /* fallthru */
1686 case SNDRV_PCM_STATE_SUSPENDED:
1687 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1688 break;
1689 }
1690 snd_pcm_stream_unlock_irq(substream);
1691
1692 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1693 substream, f_flags);
1694}
1695
1696/*
1697 * drain ioctl
1698 */
1699
1700static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1701{
1702 struct snd_pcm_runtime *runtime = substream->runtime;
1703 switch (runtime->status->state) {
1704 case SNDRV_PCM_STATE_OPEN:
1705 case SNDRV_PCM_STATE_DISCONNECTED:
1706 case SNDRV_PCM_STATE_SUSPENDED:
1707 return -EBADFD;
1708 }
1709 runtime->trigger_master = substream;
1710 return 0;
1711}
1712
1713static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1714{
1715 struct snd_pcm_runtime *runtime = substream->runtime;
1716 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1717 switch (runtime->status->state) {
1718 case SNDRV_PCM_STATE_PREPARED:
1719 /* start playback stream if possible */
1720 if (! snd_pcm_playback_empty(substream)) {
1721 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1722 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1723 } else {
1724 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1725 }
1726 break;
1727 case SNDRV_PCM_STATE_RUNNING:
1728 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1729 break;
1730 case SNDRV_PCM_STATE_XRUN:
1731 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1732 break;
1733 default:
1734 break;
1735 }
1736 } else {
1737 /* stop running stream */
1738 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1739 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1740 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1741 snd_pcm_do_stop(substream, new_state);
1742 snd_pcm_post_stop(substream, new_state);
1743 }
1744 }
1745
1746 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1747 runtime->trigger_master == substream &&
1748 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1749 return substream->ops->trigger(substream,
1750 SNDRV_PCM_TRIGGER_DRAIN);
1751
1752 return 0;
1753}
1754
1755static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1756{
1757}
1758
1759static const struct action_ops snd_pcm_action_drain_init = {
1760 .pre_action = snd_pcm_pre_drain_init,
1761 .do_action = snd_pcm_do_drain_init,
1762 .post_action = snd_pcm_post_drain_init
1763};
1764
1765static int snd_pcm_drop(struct snd_pcm_substream *substream);
1766
1767/*
1768 * Drain the stream(s).
1769 * When the substream is linked, sync until the draining of all playback streams
1770 * is finished.
1771 * After this call, all streams are supposed to be either SETUP or DRAINING
1772 * (capture only) state.
1773 */
1774static int snd_pcm_drain(struct snd_pcm_substream *substream,
1775 struct file *file)
1776{
1777 struct snd_card *card;
1778 struct snd_pcm_runtime *runtime;
1779 struct snd_pcm_substream *s;
1780 wait_queue_entry_t wait;
1781 int result = 0;
1782 int nonblock = 0;
1783
1784 card = substream->pcm->card;
1785 runtime = substream->runtime;
1786
1787 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1788 return -EBADFD;
1789
1790 if (file) {
1791 if (file->f_flags & O_NONBLOCK)
1792 nonblock = 1;
1793 } else if (substream->f_flags & O_NONBLOCK)
1794 nonblock = 1;
1795
1796 down_read(&snd_pcm_link_rwsem);
1797 snd_pcm_stream_lock_irq(substream);
1798 /* resume pause */
1799 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1800 snd_pcm_pause(substream, 0);
1801
1802 /* pre-start/stop - all running streams are changed to DRAINING state */
1803 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1804 if (result < 0)
1805 goto unlock;
1806 /* in non-blocking, we don't wait in ioctl but let caller poll */
1807 if (nonblock) {
1808 result = -EAGAIN;
1809 goto unlock;
1810 }
1811
1812 for (;;) {
1813 long tout;
1814 struct snd_pcm_runtime *to_check;
1815 if (signal_pending(current)) {
1816 result = -ERESTARTSYS;
1817 break;
1818 }
1819 /* find a substream to drain */
1820 to_check = NULL;
1821 snd_pcm_group_for_each_entry(s, substream) {
1822 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1823 continue;
1824 runtime = s->runtime;
1825 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1826 to_check = runtime;
1827 break;
1828 }
1829 }
1830 if (!to_check)
1831 break; /* all drained */
1832 init_waitqueue_entry(&wait, current);
1833 add_wait_queue(&to_check->sleep, &wait);
1834 snd_pcm_stream_unlock_irq(substream);
1835 up_read(&snd_pcm_link_rwsem);
1836 if (runtime->no_period_wakeup)
1837 tout = MAX_SCHEDULE_TIMEOUT;
1838 else {
1839 tout = 10;
1840 if (runtime->rate) {
1841 long t = runtime->period_size * 2 / runtime->rate;
1842 tout = max(t, tout);
1843 }
1844 tout = msecs_to_jiffies(tout * 1000);
1845 }
1846 tout = schedule_timeout_interruptible(tout);
1847 down_read(&snd_pcm_link_rwsem);
1848 snd_pcm_stream_lock_irq(substream);
1849 remove_wait_queue(&to_check->sleep, &wait);
1850 if (card->shutdown) {
1851 result = -ENODEV;
1852 break;
1853 }
1854 if (tout == 0) {
1855 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1856 result = -ESTRPIPE;
1857 else {
1858 dev_dbg(substream->pcm->card->dev,
1859 "playback drain error (DMA or IRQ trouble?)\n");
1860 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1861 result = -EIO;
1862 }
1863 break;
1864 }
1865 }
1866
1867 unlock:
1868 snd_pcm_stream_unlock_irq(substream);
1869 up_read(&snd_pcm_link_rwsem);
1870
1871 return result;
1872}
1873
1874/*
1875 * drop ioctl
1876 *
1877 * Immediately put all linked substreams into SETUP state.
1878 */
1879static int snd_pcm_drop(struct snd_pcm_substream *substream)
1880{
1881 struct snd_pcm_runtime *runtime;
1882 int result = 0;
1883
1884 if (PCM_RUNTIME_CHECK(substream))
1885 return -ENXIO;
1886 runtime = substream->runtime;
1887
1888 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1889 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1890 return -EBADFD;
1891
1892 snd_pcm_stream_lock_irq(substream);
1893 /* resume pause */
1894 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1895 snd_pcm_pause(substream, 0);
1896
1897 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1898 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1899 snd_pcm_stream_unlock_irq(substream);
1900
1901 return result;
1902}
1903
1904
1905static bool is_pcm_file(struct file *file)
1906{
1907 struct inode *inode = file_inode(file);
1908 unsigned int minor;
1909
1910 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1911 return false;
1912 minor = iminor(inode);
1913 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1914 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1915}
1916
1917/*
1918 * PCM link handling
1919 */
1920static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1921{
1922 int res = 0;
1923 struct snd_pcm_file *pcm_file;
1924 struct snd_pcm_substream *substream1;
1925 struct snd_pcm_group *group;
1926 struct fd f = fdget(fd);
1927
1928 if (!f.file)
1929 return -EBADFD;
1930 if (!is_pcm_file(f.file)) {
1931 res = -EBADFD;
1932 goto _badf;
1933 }
1934 pcm_file = f.file->private_data;
1935 substream1 = pcm_file->substream;
1936 group = kmalloc(sizeof(*group), GFP_KERNEL);
1937 if (!group) {
1938 res = -ENOMEM;
1939 goto _nolock;
1940 }
1941 down_write_nonblock(&snd_pcm_link_rwsem);
1942 write_lock_irq(&snd_pcm_link_rwlock);
1943 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1944 substream->runtime->status->state != substream1->runtime->status->state ||
1945 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1946 res = -EBADFD;
1947 goto _end;
1948 }
1949 if (snd_pcm_stream_linked(substream1)) {
1950 res = -EALREADY;
1951 goto _end;
1952 }
1953 if (!snd_pcm_stream_linked(substream)) {
1954 substream->group = group;
1955 group = NULL;
1956 spin_lock_init(&substream->group->lock);
1957 mutex_init(&substream->group->mutex);
1958 INIT_LIST_HEAD(&substream->group->substreams);
1959 list_add_tail(&substream->link_list, &substream->group->substreams);
1960 substream->group->count = 1;
1961 }
1962 list_add_tail(&substream1->link_list, &substream->group->substreams);
1963 substream->group->count++;
1964 substream1->group = substream->group;
1965 _end:
1966 write_unlock_irq(&snd_pcm_link_rwlock);
1967 up_write(&snd_pcm_link_rwsem);
1968 _nolock:
1969 snd_card_unref(substream1->pcm->card);
1970 kfree(group);
1971 _badf:
1972 fdput(f);
1973 return res;
1974}
1975
1976static void relink_to_local(struct snd_pcm_substream *substream)
1977{
1978 substream->group = &substream->self_group;
1979 INIT_LIST_HEAD(&substream->self_group.substreams);
1980 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1981}
1982
1983static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1984{
1985 struct snd_pcm_substream *s;
1986 int res = 0;
1987
1988 down_write_nonblock(&snd_pcm_link_rwsem);
1989 write_lock_irq(&snd_pcm_link_rwlock);
1990 if (!snd_pcm_stream_linked(substream)) {
1991 res = -EALREADY;
1992 goto _end;
1993 }
1994 list_del(&substream->link_list);
1995 substream->group->count--;
1996 if (substream->group->count == 1) { /* detach the last stream, too */
1997 snd_pcm_group_for_each_entry(s, substream) {
1998 relink_to_local(s);
1999 break;
2000 }
2001 kfree(substream->group);
2002 }
2003 relink_to_local(substream);
2004 _end:
2005 write_unlock_irq(&snd_pcm_link_rwlock);
2006 up_write(&snd_pcm_link_rwsem);
2007 return res;
2008}
2009
2010/*
2011 * hw configurator
2012 */
2013static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2014 struct snd_pcm_hw_rule *rule)
2015{
2016 struct snd_interval t;
2017 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2018 hw_param_interval_c(params, rule->deps[1]), &t);
2019 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2020}
2021
2022static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2023 struct snd_pcm_hw_rule *rule)
2024{
2025 struct snd_interval t;
2026 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2027 hw_param_interval_c(params, rule->deps[1]), &t);
2028 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2029}
2030
2031static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2032 struct snd_pcm_hw_rule *rule)
2033{
2034 struct snd_interval t;
2035 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2036 hw_param_interval_c(params, rule->deps[1]),
2037 (unsigned long) rule->private, &t);
2038 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2039}
2040
2041static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2042 struct snd_pcm_hw_rule *rule)
2043{
2044 struct snd_interval t;
2045 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2046 (unsigned long) rule->private,
2047 hw_param_interval_c(params, rule->deps[1]), &t);
2048 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2049}
2050
2051static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2052 struct snd_pcm_hw_rule *rule)
2053{
2054 unsigned int k;
2055 const struct snd_interval *i =
2056 hw_param_interval_c(params, rule->deps[0]);
2057 struct snd_mask m;
2058 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2059 snd_mask_any(&m);
2060 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2061 int bits;
2062 if (! snd_mask_test(mask, k))
2063 continue;
2064 bits = snd_pcm_format_physical_width(k);
2065 if (bits <= 0)
2066 continue; /* ignore invalid formats */
2067 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2068 snd_mask_reset(&m, k);
2069 }
2070 return snd_mask_refine(mask, &m);
2071}
2072
2073static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2074 struct snd_pcm_hw_rule *rule)
2075{
2076 struct snd_interval t;
2077 unsigned int k;
2078 t.min = UINT_MAX;
2079 t.max = 0;
2080 t.openmin = 0;
2081 t.openmax = 0;
2082 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2083 int bits;
2084 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2085 continue;
2086 bits = snd_pcm_format_physical_width(k);
2087 if (bits <= 0)
2088 continue; /* ignore invalid formats */
2089 if (t.min > (unsigned)bits)
2090 t.min = bits;
2091 if (t.max < (unsigned)bits)
2092 t.max = bits;
2093 }
2094 t.integer = 1;
2095 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2096}
2097
2098#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2099#error "Change this table"
2100#endif
2101
2102static const unsigned int rates[] = {
2103 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2104 48000, 64000, 88200, 96000, 176400, 192000
2105};
2106
2107const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2108 .count = ARRAY_SIZE(rates),
2109 .list = rates,
2110};
2111
2112static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2113 struct snd_pcm_hw_rule *rule)
2114{
2115 struct snd_pcm_hardware *hw = rule->private;
2116 return snd_interval_list(hw_param_interval(params, rule->var),
2117 snd_pcm_known_rates.count,
2118 snd_pcm_known_rates.list, hw->rates);
2119}
2120
2121static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2122 struct snd_pcm_hw_rule *rule)
2123{
2124 struct snd_interval t;
2125 struct snd_pcm_substream *substream = rule->private;
2126 t.min = 0;
2127 t.max = substream->buffer_bytes_max;
2128 t.openmin = 0;
2129 t.openmax = 0;
2130 t.integer = 1;
2131 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2132}
2133
2134int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2135{
2136 struct snd_pcm_runtime *runtime = substream->runtime;
2137 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2138 int k, err;
2139
2140 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2141 snd_mask_any(constrs_mask(constrs, k));
2142 }
2143
2144 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2145 snd_interval_any(constrs_interval(constrs, k));
2146 }
2147
2148 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2151 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2152 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2153
2154 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2155 snd_pcm_hw_rule_format, NULL,
2156 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2157 if (err < 0)
2158 return err;
2159 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2160 snd_pcm_hw_rule_sample_bits, NULL,
2161 SNDRV_PCM_HW_PARAM_FORMAT,
2162 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2163 if (err < 0)
2164 return err;
2165 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2166 snd_pcm_hw_rule_div, NULL,
2167 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2168 if (err < 0)
2169 return err;
2170 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2171 snd_pcm_hw_rule_mul, NULL,
2172 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2173 if (err < 0)
2174 return err;
2175 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2176 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2177 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2178 if (err < 0)
2179 return err;
2180 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2181 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2182 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2183 if (err < 0)
2184 return err;
2185 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2186 snd_pcm_hw_rule_div, NULL,
2187 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2188 if (err < 0)
2189 return err;
2190 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2191 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2192 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2193 if (err < 0)
2194 return err;
2195 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2196 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2197 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2198 if (err < 0)
2199 return err;
2200 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2201 snd_pcm_hw_rule_div, NULL,
2202 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2203 if (err < 0)
2204 return err;
2205 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2206 snd_pcm_hw_rule_div, NULL,
2207 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2208 if (err < 0)
2209 return err;
2210 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2211 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2212 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2213 if (err < 0)
2214 return err;
2215 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2216 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2217 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2218 if (err < 0)
2219 return err;
2220 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2221 snd_pcm_hw_rule_mul, NULL,
2222 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2223 if (err < 0)
2224 return err;
2225 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2226 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2227 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2228 if (err < 0)
2229 return err;
2230 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2231 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2232 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2233 if (err < 0)
2234 return err;
2235 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2236 snd_pcm_hw_rule_muldivk, (void*) 8,
2237 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2238 if (err < 0)
2239 return err;
2240 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2241 snd_pcm_hw_rule_muldivk, (void*) 8,
2242 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2243 if (err < 0)
2244 return err;
2245 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2246 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2247 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2248 if (err < 0)
2249 return err;
2250 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2251 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2252 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2253 if (err < 0)
2254 return err;
2255 return 0;
2256}
2257
2258int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2259{
2260 struct snd_pcm_runtime *runtime = substream->runtime;
2261 struct snd_pcm_hardware *hw = &runtime->hw;
2262 int err;
2263 unsigned int mask = 0;
2264
2265 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2266 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2267 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2268 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2269 if (hw_support_mmap(substream)) {
2270 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2271 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2272 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2273 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2274 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2275 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2276 }
2277 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2278 if (err < 0)
2279 return err;
2280
2281 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2282 if (err < 0)
2283 return err;
2284
2285 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2286 if (err < 0)
2287 return err;
2288
2289 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2290 hw->channels_min, hw->channels_max);
2291 if (err < 0)
2292 return err;
2293
2294 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2295 hw->rate_min, hw->rate_max);
2296 if (err < 0)
2297 return err;
2298
2299 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2300 hw->period_bytes_min, hw->period_bytes_max);
2301 if (err < 0)
2302 return err;
2303
2304 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2305 hw->periods_min, hw->periods_max);
2306 if (err < 0)
2307 return err;
2308
2309 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2310 hw->period_bytes_min, hw->buffer_bytes_max);
2311 if (err < 0)
2312 return err;
2313
2314 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2315 snd_pcm_hw_rule_buffer_bytes_max, substream,
2316 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2317 if (err < 0)
2318 return err;
2319
2320 /* FIXME: remove */
2321 if (runtime->dma_bytes) {
2322 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2323 if (err < 0)
2324 return err;
2325 }
2326
2327 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2328 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2329 snd_pcm_hw_rule_rate, hw,
2330 SNDRV_PCM_HW_PARAM_RATE, -1);
2331 if (err < 0)
2332 return err;
2333 }
2334
2335 /* FIXME: this belong to lowlevel */
2336 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2337
2338 return 0;
2339}
2340
2341static void pcm_release_private(struct snd_pcm_substream *substream)
2342{
2343 snd_pcm_unlink(substream);
2344}
2345
2346void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2347{
2348 substream->ref_count--;
2349 if (substream->ref_count > 0)
2350 return;
2351
2352 snd_pcm_drop(substream);
2353 if (substream->hw_opened) {
2354 if (substream->ops->hw_free &&
2355 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2356 substream->ops->hw_free(substream);
2357 substream->ops->close(substream);
2358 substream->hw_opened = 0;
2359 }
2360 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2361 pm_qos_remove_request(&substream->latency_pm_qos_req);
2362 if (substream->pcm_release) {
2363 substream->pcm_release(substream);
2364 substream->pcm_release = NULL;
2365 }
2366 snd_pcm_detach_substream(substream);
2367}
2368EXPORT_SYMBOL(snd_pcm_release_substream);
2369
2370int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2371 struct file *file,
2372 struct snd_pcm_substream **rsubstream)
2373{
2374 struct snd_pcm_substream *substream;
2375 int err;
2376
2377 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2378 if (err < 0)
2379 return err;
2380 if (substream->ref_count > 1) {
2381 *rsubstream = substream;
2382 return 0;
2383 }
2384
2385 err = snd_pcm_hw_constraints_init(substream);
2386 if (err < 0) {
2387 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2388 goto error;
2389 }
2390
2391 if ((err = substream->ops->open(substream)) < 0)
2392 goto error;
2393
2394 substream->hw_opened = 1;
2395
2396 err = snd_pcm_hw_constraints_complete(substream);
2397 if (err < 0) {
2398 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2399 goto error;
2400 }
2401
2402 *rsubstream = substream;
2403 return 0;
2404
2405 error:
2406 snd_pcm_release_substream(substream);
2407 return err;
2408}
2409EXPORT_SYMBOL(snd_pcm_open_substream);
2410
2411static int snd_pcm_open_file(struct file *file,
2412 struct snd_pcm *pcm,
2413 int stream)
2414{
2415 struct snd_pcm_file *pcm_file;
2416 struct snd_pcm_substream *substream;
2417 int err;
2418
2419 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2420 if (err < 0)
2421 return err;
2422
2423 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2424 if (pcm_file == NULL) {
2425 snd_pcm_release_substream(substream);
2426 return -ENOMEM;
2427 }
2428 pcm_file->substream = substream;
2429 if (substream->ref_count == 1) {
2430 substream->file = pcm_file;
2431 substream->pcm_release = pcm_release_private;
2432 }
2433 file->private_data = pcm_file;
2434
2435 return 0;
2436}
2437
2438static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2439{
2440 struct snd_pcm *pcm;
2441 int err = nonseekable_open(inode, file);
2442 if (err < 0)
2443 return err;
2444 pcm = snd_lookup_minor_data(iminor(inode),
2445 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2446 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2447 if (pcm)
2448 snd_card_unref(pcm->card);
2449 return err;
2450}
2451
2452static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2453{
2454 struct snd_pcm *pcm;
2455 int err = nonseekable_open(inode, file);
2456 if (err < 0)
2457 return err;
2458 pcm = snd_lookup_minor_data(iminor(inode),
2459 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2460 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2461 if (pcm)
2462 snd_card_unref(pcm->card);
2463 return err;
2464}
2465
2466static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2467{
2468 int err;
2469 wait_queue_entry_t wait;
2470
2471 if (pcm == NULL) {
2472 err = -ENODEV;
2473 goto __error1;
2474 }
2475 err = snd_card_file_add(pcm->card, file);
2476 if (err < 0)
2477 goto __error1;
2478 if (!try_module_get(pcm->card->module)) {
2479 err = -EFAULT;
2480 goto __error2;
2481 }
2482 init_waitqueue_entry(&wait, current);
2483 add_wait_queue(&pcm->open_wait, &wait);
2484 mutex_lock(&pcm->open_mutex);
2485 while (1) {
2486 err = snd_pcm_open_file(file, pcm, stream);
2487 if (err >= 0)
2488 break;
2489 if (err == -EAGAIN) {
2490 if (file->f_flags & O_NONBLOCK) {
2491 err = -EBUSY;
2492 break;
2493 }
2494 } else
2495 break;
2496 set_current_state(TASK_INTERRUPTIBLE);
2497 mutex_unlock(&pcm->open_mutex);
2498 schedule();
2499 mutex_lock(&pcm->open_mutex);
2500 if (pcm->card->shutdown) {
2501 err = -ENODEV;
2502 break;
2503 }
2504 if (signal_pending(current)) {
2505 err = -ERESTARTSYS;
2506 break;
2507 }
2508 }
2509 remove_wait_queue(&pcm->open_wait, &wait);
2510 mutex_unlock(&pcm->open_mutex);
2511 if (err < 0)
2512 goto __error;
2513 return err;
2514
2515 __error:
2516 module_put(pcm->card->module);
2517 __error2:
2518 snd_card_file_remove(pcm->card, file);
2519 __error1:
2520 return err;
2521}
2522
2523static int snd_pcm_release(struct inode *inode, struct file *file)
2524{
2525 struct snd_pcm *pcm;
2526 struct snd_pcm_substream *substream;
2527 struct snd_pcm_file *pcm_file;
2528
2529 pcm_file = file->private_data;
2530 substream = pcm_file->substream;
2531 if (snd_BUG_ON(!substream))
2532 return -ENXIO;
2533 pcm = substream->pcm;
2534 mutex_lock(&pcm->open_mutex);
2535 snd_pcm_release_substream(substream);
2536 kfree(pcm_file);
2537 mutex_unlock(&pcm->open_mutex);
2538 wake_up(&pcm->open_wait);
2539 module_put(pcm->card->module);
2540 snd_card_file_remove(pcm->card, file);
2541 return 0;
2542}
2543
2544/* check and update PCM state; return 0 or a negative error
2545 * call this inside PCM lock
2546 */
2547static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2548{
2549 switch (substream->runtime->status->state) {
2550 case SNDRV_PCM_STATE_DRAINING:
2551 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2552 return -EBADFD;
2553 /* Fall through */
2554 case SNDRV_PCM_STATE_RUNNING:
2555 return snd_pcm_update_hw_ptr(substream);
2556 case SNDRV_PCM_STATE_PREPARED:
2557 case SNDRV_PCM_STATE_PAUSED:
2558 return 0;
2559 case SNDRV_PCM_STATE_SUSPENDED:
2560 return -ESTRPIPE;
2561 case SNDRV_PCM_STATE_XRUN:
2562 return -EPIPE;
2563 default:
2564 return -EBADFD;
2565 }
2566}
2567
2568/* increase the appl_ptr; returns the processed frames or a negative error */
2569static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2570 snd_pcm_uframes_t frames,
2571 snd_pcm_sframes_t avail)
2572{
2573 struct snd_pcm_runtime *runtime = substream->runtime;
2574 snd_pcm_sframes_t appl_ptr;
2575 int ret;
2576
2577 if (avail <= 0)
2578 return 0;
2579 if (frames > (snd_pcm_uframes_t)avail)
2580 frames = avail;
2581 appl_ptr = runtime->control->appl_ptr + frames;
2582 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2583 appl_ptr -= runtime->boundary;
2584 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2585 return ret < 0 ? ret : frames;
2586}
2587
2588/* decrease the appl_ptr; returns the processed frames or zero for error */
2589static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2590 snd_pcm_uframes_t frames,
2591 snd_pcm_sframes_t avail)
2592{
2593 struct snd_pcm_runtime *runtime = substream->runtime;
2594 snd_pcm_sframes_t appl_ptr;
2595 int ret;
2596
2597 if (avail <= 0)
2598 return 0;
2599 if (frames > (snd_pcm_uframes_t)avail)
2600 frames = avail;
2601 appl_ptr = runtime->control->appl_ptr - frames;
2602 if (appl_ptr < 0)
2603 appl_ptr += runtime->boundary;
2604 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2605 /* NOTE: we return zero for errors because PulseAudio gets depressed
2606 * upon receiving an error from rewind ioctl and stops processing
2607 * any longer. Returning zero means that no rewind is done, so
2608 * it's not absolutely wrong to answer like that.
2609 */
2610 return ret < 0 ? 0 : frames;
2611}
2612
2613static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2614 snd_pcm_uframes_t frames)
2615{
2616 struct snd_pcm_runtime *runtime = substream->runtime;
2617 snd_pcm_sframes_t ret;
2618
2619 if (frames == 0)
2620 return 0;
2621
2622 snd_pcm_stream_lock_irq(substream);
2623 ret = do_pcm_hwsync(substream);
2624 if (!ret)
2625 ret = rewind_appl_ptr(substream, frames,
2626 snd_pcm_playback_hw_avail(runtime));
2627 snd_pcm_stream_unlock_irq(substream);
2628 return ret;
2629}
2630
2631static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2632 snd_pcm_uframes_t frames)
2633{
2634 struct snd_pcm_runtime *runtime = substream->runtime;
2635 snd_pcm_sframes_t ret;
2636
2637 if (frames == 0)
2638 return 0;
2639
2640 snd_pcm_stream_lock_irq(substream);
2641 ret = do_pcm_hwsync(substream);
2642 if (!ret)
2643 ret = rewind_appl_ptr(substream, frames,
2644 snd_pcm_capture_hw_avail(runtime));
2645 snd_pcm_stream_unlock_irq(substream);
2646 return ret;
2647}
2648
2649static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2650 snd_pcm_uframes_t frames)
2651{
2652 struct snd_pcm_runtime *runtime = substream->runtime;
2653 snd_pcm_sframes_t ret;
2654
2655 if (frames == 0)
2656 return 0;
2657
2658 snd_pcm_stream_lock_irq(substream);
2659 ret = do_pcm_hwsync(substream);
2660 if (!ret)
2661 ret = forward_appl_ptr(substream, frames,
2662 snd_pcm_playback_avail(runtime));
2663 snd_pcm_stream_unlock_irq(substream);
2664 return ret;
2665}
2666
2667static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2668 snd_pcm_uframes_t frames)
2669{
2670 struct snd_pcm_runtime *runtime = substream->runtime;
2671 snd_pcm_sframes_t ret;
2672
2673 if (frames == 0)
2674 return 0;
2675
2676 snd_pcm_stream_lock_irq(substream);
2677 ret = do_pcm_hwsync(substream);
2678 if (!ret)
2679 ret = forward_appl_ptr(substream, frames,
2680 snd_pcm_capture_avail(runtime));
2681 snd_pcm_stream_unlock_irq(substream);
2682 return ret;
2683}
2684
2685static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2686{
2687 int err;
2688
2689 snd_pcm_stream_lock_irq(substream);
2690 err = do_pcm_hwsync(substream);
2691 snd_pcm_stream_unlock_irq(substream);
2692 return err;
2693}
2694
2695static int snd_pcm_delay(struct snd_pcm_substream *substream,
2696 snd_pcm_sframes_t *delay)
2697{
2698 struct snd_pcm_runtime *runtime = substream->runtime;
2699 int err;
2700 snd_pcm_sframes_t n = 0;
2701
2702 snd_pcm_stream_lock_irq(substream);
2703 err = do_pcm_hwsync(substream);
2704 if (!err) {
2705 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2706 n = snd_pcm_playback_hw_avail(runtime);
2707 else
2708 n = snd_pcm_capture_avail(runtime);
2709 n += runtime->delay;
2710 }
2711 snd_pcm_stream_unlock_irq(substream);
2712 if (!err)
2713 *delay = n;
2714 return err;
2715}
2716
2717static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2718 struct snd_pcm_sync_ptr __user *_sync_ptr)
2719{
2720 struct snd_pcm_runtime *runtime = substream->runtime;
2721 struct snd_pcm_sync_ptr sync_ptr;
2722 volatile struct snd_pcm_mmap_status *status;
2723 volatile struct snd_pcm_mmap_control *control;
2724 int err;
2725
2726 memset(&sync_ptr, 0, sizeof(sync_ptr));
2727 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2728 return -EFAULT;
2729 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2730 return -EFAULT;
2731 status = runtime->status;
2732 control = runtime->control;
2733 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2734 err = snd_pcm_hwsync(substream);
2735 if (err < 0)
2736 return err;
2737 }
2738 snd_pcm_stream_lock_irq(substream);
2739 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2740 err = pcm_lib_apply_appl_ptr(substream,
2741 sync_ptr.c.control.appl_ptr);
2742 if (err < 0) {
2743 snd_pcm_stream_unlock_irq(substream);
2744 return err;
2745 }
2746 } else {
2747 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2748 }
2749 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2750 control->avail_min = sync_ptr.c.control.avail_min;
2751 else
2752 sync_ptr.c.control.avail_min = control->avail_min;
2753 sync_ptr.s.status.state = status->state;
2754 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2755 sync_ptr.s.status.tstamp = status->tstamp;
2756 sync_ptr.s.status.suspended_state = status->suspended_state;
2757 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2758 snd_pcm_stream_unlock_irq(substream);
2759 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2760 return -EFAULT;
2761 return 0;
2762}
2763
2764static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2765{
2766 struct snd_pcm_runtime *runtime = substream->runtime;
2767 int arg;
2768
2769 if (get_user(arg, _arg))
2770 return -EFAULT;
2771 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2772 return -EINVAL;
2773 runtime->tstamp_type = arg;
2774 return 0;
2775}
2776
2777static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2778 struct snd_xferi __user *_xferi)
2779{
2780 struct snd_xferi xferi;
2781 struct snd_pcm_runtime *runtime = substream->runtime;
2782 snd_pcm_sframes_t result;
2783
2784 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2785 return -EBADFD;
2786 if (put_user(0, &_xferi->result))
2787 return -EFAULT;
2788 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2789 return -EFAULT;
2790 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2791 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2792 else
2793 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2794 __put_user(result, &_xferi->result);
2795 return result < 0 ? result : 0;
2796}
2797
2798static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2799 struct snd_xfern __user *_xfern)
2800{
2801 struct snd_xfern xfern;
2802 struct snd_pcm_runtime *runtime = substream->runtime;
2803 void *bufs;
2804 snd_pcm_sframes_t result;
2805
2806 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2807 return -EBADFD;
2808 if (runtime->channels > 128)
2809 return -EINVAL;
2810 if (put_user(0, &_xfern->result))
2811 return -EFAULT;
2812 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2813 return -EFAULT;
2814
2815 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2816 if (IS_ERR(bufs))
2817 return PTR_ERR(bufs);
2818 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2819 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2820 else
2821 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2822 kfree(bufs);
2823 __put_user(result, &_xfern->result);
2824 return result < 0 ? result : 0;
2825}
2826
2827static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2828 snd_pcm_uframes_t __user *_frames)
2829{
2830 snd_pcm_uframes_t frames;
2831 snd_pcm_sframes_t result;
2832
2833 if (get_user(frames, _frames))
2834 return -EFAULT;
2835 if (put_user(0, _frames))
2836 return -EFAULT;
2837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2838 result = snd_pcm_playback_rewind(substream, frames);
2839 else
2840 result = snd_pcm_capture_rewind(substream, frames);
2841 __put_user(result, _frames);
2842 return result < 0 ? result : 0;
2843}
2844
2845static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2846 snd_pcm_uframes_t __user *_frames)
2847{
2848 snd_pcm_uframes_t frames;
2849 snd_pcm_sframes_t result;
2850
2851 if (get_user(frames, _frames))
2852 return -EFAULT;
2853 if (put_user(0, _frames))
2854 return -EFAULT;
2855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2856 result = snd_pcm_playback_forward(substream, frames);
2857 else
2858 result = snd_pcm_capture_forward(substream, frames);
2859 __put_user(result, _frames);
2860 return result < 0 ? result : 0;
2861}
2862
2863static int snd_pcm_common_ioctl(struct file *file,
2864 struct snd_pcm_substream *substream,
2865 unsigned int cmd, void __user *arg)
2866{
2867 struct snd_pcm_file *pcm_file = file->private_data;
2868 int res;
2869
2870 if (PCM_RUNTIME_CHECK(substream))
2871 return -ENXIO;
2872
2873 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2874 if (res < 0)
2875 return res;
2876
2877 switch (cmd) {
2878 case SNDRV_PCM_IOCTL_PVERSION:
2879 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2880 case SNDRV_PCM_IOCTL_INFO:
2881 return snd_pcm_info_user(substream, arg);
2882 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2883 return 0;
2884 case SNDRV_PCM_IOCTL_TTSTAMP:
2885 return snd_pcm_tstamp(substream, arg);
2886 case SNDRV_PCM_IOCTL_USER_PVERSION:
2887 if (get_user(pcm_file->user_pversion,
2888 (unsigned int __user *)arg))
2889 return -EFAULT;
2890 return 0;
2891 case SNDRV_PCM_IOCTL_HW_REFINE:
2892 return snd_pcm_hw_refine_user(substream, arg);
2893 case SNDRV_PCM_IOCTL_HW_PARAMS:
2894 return snd_pcm_hw_params_user(substream, arg);
2895 case SNDRV_PCM_IOCTL_HW_FREE:
2896 return snd_pcm_hw_free(substream);
2897 case SNDRV_PCM_IOCTL_SW_PARAMS:
2898 return snd_pcm_sw_params_user(substream, arg);
2899 case SNDRV_PCM_IOCTL_STATUS:
2900 return snd_pcm_status_user(substream, arg, false);
2901 case SNDRV_PCM_IOCTL_STATUS_EXT:
2902 return snd_pcm_status_user(substream, arg, true);
2903 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2904 return snd_pcm_channel_info_user(substream, arg);
2905 case SNDRV_PCM_IOCTL_PREPARE:
2906 return snd_pcm_prepare(substream, file);
2907 case SNDRV_PCM_IOCTL_RESET:
2908 return snd_pcm_reset(substream);
2909 case SNDRV_PCM_IOCTL_START:
2910 return snd_pcm_start_lock_irq(substream);
2911 case SNDRV_PCM_IOCTL_LINK:
2912 return snd_pcm_link(substream, (int)(unsigned long) arg);
2913 case SNDRV_PCM_IOCTL_UNLINK:
2914 return snd_pcm_unlink(substream);
2915 case SNDRV_PCM_IOCTL_RESUME:
2916 return snd_pcm_resume(substream);
2917 case SNDRV_PCM_IOCTL_XRUN:
2918 return snd_pcm_xrun(substream);
2919 case SNDRV_PCM_IOCTL_HWSYNC:
2920 return snd_pcm_hwsync(substream);
2921 case SNDRV_PCM_IOCTL_DELAY:
2922 {
2923 snd_pcm_sframes_t delay;
2924 snd_pcm_sframes_t __user *res = arg;
2925 int err;
2926
2927 err = snd_pcm_delay(substream, &delay);
2928 if (err)
2929 return err;
2930 if (put_user(delay, res))
2931 return -EFAULT;
2932 return 0;
2933 }
2934 case SNDRV_PCM_IOCTL_SYNC_PTR:
2935 return snd_pcm_sync_ptr(substream, arg);
2936#ifdef CONFIG_SND_SUPPORT_OLD_API
2937 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2938 return snd_pcm_hw_refine_old_user(substream, arg);
2939 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2940 return snd_pcm_hw_params_old_user(substream, arg);
2941#endif
2942 case SNDRV_PCM_IOCTL_DRAIN:
2943 return snd_pcm_drain(substream, file);
2944 case SNDRV_PCM_IOCTL_DROP:
2945 return snd_pcm_drop(substream);
2946 case SNDRV_PCM_IOCTL_PAUSE:
2947 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2948 substream,
2949 (int)(unsigned long)arg);
2950 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2951 case SNDRV_PCM_IOCTL_READI_FRAMES:
2952 return snd_pcm_xferi_frames_ioctl(substream, arg);
2953 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2954 case SNDRV_PCM_IOCTL_READN_FRAMES:
2955 return snd_pcm_xfern_frames_ioctl(substream, arg);
2956 case SNDRV_PCM_IOCTL_REWIND:
2957 return snd_pcm_rewind_ioctl(substream, arg);
2958 case SNDRV_PCM_IOCTL_FORWARD:
2959 return snd_pcm_forward_ioctl(substream, arg);
2960 }
2961 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2962 return -ENOTTY;
2963}
2964
2965static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2966 unsigned long arg)
2967{
2968 struct snd_pcm_file *pcm_file;
2969
2970 pcm_file = file->private_data;
2971
2972 if (((cmd >> 8) & 0xff) != 'A')
2973 return -ENOTTY;
2974
2975 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2976 (void __user *)arg);
2977}
2978
2979/**
2980 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2981 * @substream: PCM substream
2982 * @cmd: IOCTL cmd
2983 * @arg: IOCTL argument
2984 *
2985 * The function is provided primarily for OSS layer and USB gadget drivers,
2986 * and it allows only the limited set of ioctls (hw_params, sw_params,
2987 * prepare, start, drain, drop, forward).
2988 */
2989int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2990 unsigned int cmd, void *arg)
2991{
2992 snd_pcm_uframes_t *frames = arg;
2993 snd_pcm_sframes_t result;
2994
2995 switch (cmd) {
2996 case SNDRV_PCM_IOCTL_FORWARD:
2997 {
2998 /* provided only for OSS; capture-only and no value returned */
2999 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3000 return -EINVAL;
3001 result = snd_pcm_capture_forward(substream, *frames);
3002 return result < 0 ? result : 0;
3003 }
3004 case SNDRV_PCM_IOCTL_HW_PARAMS:
3005 return snd_pcm_hw_params(substream, arg);
3006 case SNDRV_PCM_IOCTL_SW_PARAMS:
3007 return snd_pcm_sw_params(substream, arg);
3008 case SNDRV_PCM_IOCTL_PREPARE:
3009 return snd_pcm_prepare(substream, NULL);
3010 case SNDRV_PCM_IOCTL_START:
3011 return snd_pcm_start_lock_irq(substream);
3012 case SNDRV_PCM_IOCTL_DRAIN:
3013 return snd_pcm_drain(substream, NULL);
3014 case SNDRV_PCM_IOCTL_DROP:
3015 return snd_pcm_drop(substream);
3016 case SNDRV_PCM_IOCTL_DELAY:
3017 return snd_pcm_delay(substream, frames);
3018 default:
3019 return -EINVAL;
3020 }
3021}
3022EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3023
3024static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3025 loff_t * offset)
3026{
3027 struct snd_pcm_file *pcm_file;
3028 struct snd_pcm_substream *substream;
3029 struct snd_pcm_runtime *runtime;
3030 snd_pcm_sframes_t result;
3031
3032 pcm_file = file->private_data;
3033 substream = pcm_file->substream;
3034 if (PCM_RUNTIME_CHECK(substream))
3035 return -ENXIO;
3036 runtime = substream->runtime;
3037 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3038 return -EBADFD;
3039 if (!frame_aligned(runtime, count))
3040 return -EINVAL;
3041 count = bytes_to_frames(runtime, count);
3042 result = snd_pcm_lib_read(substream, buf, count);
3043 if (result > 0)
3044 result = frames_to_bytes(runtime, result);
3045 return result;
3046}
3047
3048static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3049 size_t count, loff_t * offset)
3050{
3051 struct snd_pcm_file *pcm_file;
3052 struct snd_pcm_substream *substream;
3053 struct snd_pcm_runtime *runtime;
3054 snd_pcm_sframes_t result;
3055
3056 pcm_file = file->private_data;
3057 substream = pcm_file->substream;
3058 if (PCM_RUNTIME_CHECK(substream))
3059 return -ENXIO;
3060 runtime = substream->runtime;
3061 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3062 return -EBADFD;
3063 if (!frame_aligned(runtime, count))
3064 return -EINVAL;
3065 count = bytes_to_frames(runtime, count);
3066 result = snd_pcm_lib_write(substream, buf, count);
3067 if (result > 0)
3068 result = frames_to_bytes(runtime, result);
3069 return result;
3070}
3071
3072static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3073{
3074 struct snd_pcm_file *pcm_file;
3075 struct snd_pcm_substream *substream;
3076 struct snd_pcm_runtime *runtime;
3077 snd_pcm_sframes_t result;
3078 unsigned long i;
3079 void __user **bufs;
3080 snd_pcm_uframes_t frames;
3081
3082 pcm_file = iocb->ki_filp->private_data;
3083 substream = pcm_file->substream;
3084 if (PCM_RUNTIME_CHECK(substream))
3085 return -ENXIO;
3086 runtime = substream->runtime;
3087 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3088 return -EBADFD;
3089 if (!iter_is_iovec(to))
3090 return -EINVAL;
3091 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3092 return -EINVAL;
3093 if (!frame_aligned(runtime, to->iov->iov_len))
3094 return -EINVAL;
3095 frames = bytes_to_samples(runtime, to->iov->iov_len);
3096 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3097 if (bufs == NULL)
3098 return -ENOMEM;
3099 for (i = 0; i < to->nr_segs; ++i)
3100 bufs[i] = to->iov[i].iov_base;
3101 result = snd_pcm_lib_readv(substream, bufs, frames);
3102 if (result > 0)
3103 result = frames_to_bytes(runtime, result);
3104 kfree(bufs);
3105 return result;
3106}
3107
3108static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3109{
3110 struct snd_pcm_file *pcm_file;
3111 struct snd_pcm_substream *substream;
3112 struct snd_pcm_runtime *runtime;
3113 snd_pcm_sframes_t result;
3114 unsigned long i;
3115 void __user **bufs;
3116 snd_pcm_uframes_t frames;
3117
3118 pcm_file = iocb->ki_filp->private_data;
3119 substream = pcm_file->substream;
3120 if (PCM_RUNTIME_CHECK(substream))
3121 return -ENXIO;
3122 runtime = substream->runtime;
3123 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3124 return -EBADFD;
3125 if (!iter_is_iovec(from))
3126 return -EINVAL;
3127 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3128 !frame_aligned(runtime, from->iov->iov_len))
3129 return -EINVAL;
3130 frames = bytes_to_samples(runtime, from->iov->iov_len);
3131 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3132 if (bufs == NULL)
3133 return -ENOMEM;
3134 for (i = 0; i < from->nr_segs; ++i)
3135 bufs[i] = from->iov[i].iov_base;
3136 result = snd_pcm_lib_writev(substream, bufs, frames);
3137 if (result > 0)
3138 result = frames_to_bytes(runtime, result);
3139 kfree(bufs);
3140 return result;
3141}
3142
3143static __poll_t snd_pcm_playback_poll(struct file *file, poll_table * wait)
3144{
3145 struct snd_pcm_file *pcm_file;
3146 struct snd_pcm_substream *substream;
3147 struct snd_pcm_runtime *runtime;
3148 __poll_t mask;
3149 snd_pcm_uframes_t avail;
3150
3151 pcm_file = file->private_data;
3152
3153 substream = pcm_file->substream;
3154 if (PCM_RUNTIME_CHECK(substream))
3155 return EPOLLOUT | EPOLLWRNORM | EPOLLERR;
3156 runtime = substream->runtime;
3157
3158 poll_wait(file, &runtime->sleep, wait);
3159
3160 snd_pcm_stream_lock_irq(substream);
3161 avail = snd_pcm_playback_avail(runtime);
3162 switch (runtime->status->state) {
3163 case SNDRV_PCM_STATE_RUNNING:
3164 case SNDRV_PCM_STATE_PREPARED:
3165 case SNDRV_PCM_STATE_PAUSED:
3166 if (avail >= runtime->control->avail_min) {
3167 mask = EPOLLOUT | EPOLLWRNORM;
3168 break;
3169 }
3170 /* Fall through */
3171 case SNDRV_PCM_STATE_DRAINING:
3172 mask = 0;
3173 break;
3174 default:
3175 mask = EPOLLOUT | EPOLLWRNORM | EPOLLERR;
3176 break;
3177 }
3178 snd_pcm_stream_unlock_irq(substream);
3179 return mask;
3180}
3181
3182static __poll_t snd_pcm_capture_poll(struct file *file, poll_table * wait)
3183{
3184 struct snd_pcm_file *pcm_file;
3185 struct snd_pcm_substream *substream;
3186 struct snd_pcm_runtime *runtime;
3187 __poll_t mask;
3188 snd_pcm_uframes_t avail;
3189
3190 pcm_file = file->private_data;
3191
3192 substream = pcm_file->substream;
3193 if (PCM_RUNTIME_CHECK(substream))
3194 return EPOLLIN | EPOLLRDNORM | EPOLLERR;
3195 runtime = substream->runtime;
3196
3197 poll_wait(file, &runtime->sleep, wait);
3198
3199 snd_pcm_stream_lock_irq(substream);
3200 avail = snd_pcm_capture_avail(runtime);
3201 switch (runtime->status->state) {
3202 case SNDRV_PCM_STATE_RUNNING:
3203 case SNDRV_PCM_STATE_PREPARED:
3204 case SNDRV_PCM_STATE_PAUSED:
3205 if (avail >= runtime->control->avail_min) {
3206 mask = EPOLLIN | EPOLLRDNORM;
3207 break;
3208 }
3209 mask = 0;
3210 break;
3211 case SNDRV_PCM_STATE_DRAINING:
3212 if (avail > 0) {
3213 mask = EPOLLIN | EPOLLRDNORM;
3214 break;
3215 }
3216 /* Fall through */
3217 default:
3218 mask = EPOLLIN | EPOLLRDNORM | EPOLLERR;
3219 break;
3220 }
3221 snd_pcm_stream_unlock_irq(substream);
3222 return mask;
3223}
3224
3225/*
3226 * mmap support
3227 */
3228
3229/*
3230 * Only on coherent architectures, we can mmap the status and the control records
3231 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3232 */
3233#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3234/*
3235 * mmap status record
3236 */
3237static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3238{
3239 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3240 struct snd_pcm_runtime *runtime;
3241
3242 if (substream == NULL)
3243 return VM_FAULT_SIGBUS;
3244 runtime = substream->runtime;
3245 vmf->page = virt_to_page(runtime->status);
3246 get_page(vmf->page);
3247 return 0;
3248}
3249
3250static const struct vm_operations_struct snd_pcm_vm_ops_status =
3251{
3252 .fault = snd_pcm_mmap_status_fault,
3253};
3254
3255static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3256 struct vm_area_struct *area)
3257{
3258 long size;
3259 if (!(area->vm_flags & VM_READ))
3260 return -EINVAL;
3261 size = area->vm_end - area->vm_start;
3262 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3263 return -EINVAL;
3264 area->vm_ops = &snd_pcm_vm_ops_status;
3265 area->vm_private_data = substream;
3266 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3267 return 0;
3268}
3269
3270/*
3271 * mmap control record
3272 */
3273static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3274{
3275 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3276 struct snd_pcm_runtime *runtime;
3277
3278 if (substream == NULL)
3279 return VM_FAULT_SIGBUS;
3280 runtime = substream->runtime;
3281 vmf->page = virt_to_page(runtime->control);
3282 get_page(vmf->page);
3283 return 0;
3284}
3285
3286static const struct vm_operations_struct snd_pcm_vm_ops_control =
3287{
3288 .fault = snd_pcm_mmap_control_fault,
3289};
3290
3291static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3292 struct vm_area_struct *area)
3293{
3294 long size;
3295 if (!(area->vm_flags & VM_READ))
3296 return -EINVAL;
3297 size = area->vm_end - area->vm_start;
3298 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3299 return -EINVAL;
3300 area->vm_ops = &snd_pcm_vm_ops_control;
3301 area->vm_private_data = substream;
3302 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3303 return 0;
3304}
3305
3306static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3307{
3308 if (pcm_file->no_compat_mmap)
3309 return false;
3310 /* See pcm_control_mmap_allowed() below.
3311 * Since older alsa-lib requires both status and control mmaps to be
3312 * coupled, we have to disable the status mmap for old alsa-lib, too.
3313 */
3314 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3315 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3316 return false;
3317 return true;
3318}
3319
3320static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3321{
3322 if (pcm_file->no_compat_mmap)
3323 return false;
3324 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3325 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3326 * thus it effectively assures the manual update of appl_ptr.
3327 */
3328 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3329 return false;
3330 return true;
3331}
3332
3333#else /* ! coherent mmap */
3334/*
3335 * don't support mmap for status and control records.
3336 */
3337#define pcm_status_mmap_allowed(pcm_file) false
3338#define pcm_control_mmap_allowed(pcm_file) false
3339
3340static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3341 struct vm_area_struct *area)
3342{
3343 return -ENXIO;
3344}
3345static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3346 struct vm_area_struct *area)
3347{
3348 return -ENXIO;
3349}
3350#endif /* coherent mmap */
3351
3352static inline struct page *
3353snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3354{
3355 void *vaddr = substream->runtime->dma_area + ofs;
3356 return virt_to_page(vaddr);
3357}
3358
3359/*
3360 * fault callback for mmapping a RAM page
3361 */
3362static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3363{
3364 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3365 struct snd_pcm_runtime *runtime;
3366 unsigned long offset;
3367 struct page * page;
3368 size_t dma_bytes;
3369
3370 if (substream == NULL)
3371 return VM_FAULT_SIGBUS;
3372 runtime = substream->runtime;
3373 offset = vmf->pgoff << PAGE_SHIFT;
3374 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3375 if (offset > dma_bytes - PAGE_SIZE)
3376 return VM_FAULT_SIGBUS;
3377 if (substream->ops->page)
3378 page = substream->ops->page(substream, offset);
3379 else
3380 page = snd_pcm_default_page_ops(substream, offset);
3381 if (!page)
3382 return VM_FAULT_SIGBUS;
3383 get_page(page);
3384 vmf->page = page;
3385 return 0;
3386}
3387
3388static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3389 .open = snd_pcm_mmap_data_open,
3390 .close = snd_pcm_mmap_data_close,
3391};
3392
3393static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3394 .open = snd_pcm_mmap_data_open,
3395 .close = snd_pcm_mmap_data_close,
3396 .fault = snd_pcm_mmap_data_fault,
3397};
3398
3399/*
3400 * mmap the DMA buffer on RAM
3401 */
3402
3403/**
3404 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3405 * @substream: PCM substream
3406 * @area: VMA
3407 *
3408 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3409 * this function is invoked implicitly.
3410 */
3411int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3412 struct vm_area_struct *area)
3413{
3414 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3415#ifdef CONFIG_GENERIC_ALLOCATOR
3416 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3417 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3418 return remap_pfn_range(area, area->vm_start,
3419 substream->dma_buffer.addr >> PAGE_SHIFT,
3420 area->vm_end - area->vm_start, area->vm_page_prot);
3421 }
3422#endif /* CONFIG_GENERIC_ALLOCATOR */
3423#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3424 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3425 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3426 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3427 area,
3428 substream->runtime->dma_area,
3429 substream->runtime->dma_addr,
3430 substream->runtime->dma_bytes);
3431#endif /* CONFIG_X86 */
3432 /* mmap with fault handler */
3433 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3434 return 0;
3435}
3436EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3437
3438/*
3439 * mmap the DMA buffer on I/O memory area
3440 */
3441#if SNDRV_PCM_INFO_MMAP_IOMEM
3442/**
3443 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3444 * @substream: PCM substream
3445 * @area: VMA
3446 *
3447 * When your hardware uses the iomapped pages as the hardware buffer and
3448 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3449 * is supposed to work only on limited architectures.
3450 */
3451int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3452 struct vm_area_struct *area)
3453{
3454 struct snd_pcm_runtime *runtime = substream->runtime;
3455
3456 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3457 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3458}
3459EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3460#endif /* SNDRV_PCM_INFO_MMAP */
3461
3462/*
3463 * mmap DMA buffer
3464 */
3465int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3466 struct vm_area_struct *area)
3467{
3468 struct snd_pcm_runtime *runtime;
3469 long size;
3470 unsigned long offset;
3471 size_t dma_bytes;
3472 int err;
3473
3474 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3475 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3476 return -EINVAL;
3477 } else {
3478 if (!(area->vm_flags & VM_READ))
3479 return -EINVAL;
3480 }
3481 runtime = substream->runtime;
3482 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3483 return -EBADFD;
3484 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3485 return -ENXIO;
3486 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3487 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3488 return -EINVAL;
3489 size = area->vm_end - area->vm_start;
3490 offset = area->vm_pgoff << PAGE_SHIFT;
3491 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3492 if ((size_t)size > dma_bytes)
3493 return -EINVAL;
3494 if (offset > dma_bytes - size)
3495 return -EINVAL;
3496
3497 area->vm_ops = &snd_pcm_vm_ops_data;
3498 area->vm_private_data = substream;
3499 if (substream->ops->mmap)
3500 err = substream->ops->mmap(substream, area);
3501 else
3502 err = snd_pcm_lib_default_mmap(substream, area);
3503 if (!err)
3504 atomic_inc(&substream->mmap_count);
3505 return err;
3506}
3507EXPORT_SYMBOL(snd_pcm_mmap_data);
3508
3509static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3510{
3511 struct snd_pcm_file * pcm_file;
3512 struct snd_pcm_substream *substream;
3513 unsigned long offset;
3514
3515 pcm_file = file->private_data;
3516 substream = pcm_file->substream;
3517 if (PCM_RUNTIME_CHECK(substream))
3518 return -ENXIO;
3519
3520 offset = area->vm_pgoff << PAGE_SHIFT;
3521 switch (offset) {
3522 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3523 if (!pcm_status_mmap_allowed(pcm_file))
3524 return -ENXIO;
3525 return snd_pcm_mmap_status(substream, file, area);
3526 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3527 if (!pcm_control_mmap_allowed(pcm_file))
3528 return -ENXIO;
3529 return snd_pcm_mmap_control(substream, file, area);
3530 default:
3531 return snd_pcm_mmap_data(substream, file, area);
3532 }
3533 return 0;
3534}
3535
3536static int snd_pcm_fasync(int fd, struct file * file, int on)
3537{
3538 struct snd_pcm_file * pcm_file;
3539 struct snd_pcm_substream *substream;
3540 struct snd_pcm_runtime *runtime;
3541
3542 pcm_file = file->private_data;
3543 substream = pcm_file->substream;
3544 if (PCM_RUNTIME_CHECK(substream))
3545 return -ENXIO;
3546 runtime = substream->runtime;
3547 return fasync_helper(fd, file, on, &runtime->fasync);
3548}
3549
3550/*
3551 * ioctl32 compat
3552 */
3553#ifdef CONFIG_COMPAT
3554#include "pcm_compat.c"
3555#else
3556#define snd_pcm_ioctl_compat NULL
3557#endif
3558
3559/*
3560 * To be removed helpers to keep binary compatibility
3561 */
3562
3563#ifdef CONFIG_SND_SUPPORT_OLD_API
3564#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3565#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3566
3567static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3568 struct snd_pcm_hw_params_old *oparams)
3569{
3570 unsigned int i;
3571
3572 memset(params, 0, sizeof(*params));
3573 params->flags = oparams->flags;
3574 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3575 params->masks[i].bits[0] = oparams->masks[i];
3576 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3577 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3578 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3579 params->info = oparams->info;
3580 params->msbits = oparams->msbits;
3581 params->rate_num = oparams->rate_num;
3582 params->rate_den = oparams->rate_den;
3583 params->fifo_size = oparams->fifo_size;
3584}
3585
3586static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3587 struct snd_pcm_hw_params *params)
3588{
3589 unsigned int i;
3590
3591 memset(oparams, 0, sizeof(*oparams));
3592 oparams->flags = params->flags;
3593 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3594 oparams->masks[i] = params->masks[i].bits[0];
3595 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3596 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3597 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3598 oparams->info = params->info;
3599 oparams->msbits = params->msbits;
3600 oparams->rate_num = params->rate_num;
3601 oparams->rate_den = params->rate_den;
3602 oparams->fifo_size = params->fifo_size;
3603}
3604
3605static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3606 struct snd_pcm_hw_params_old __user * _oparams)
3607{
3608 struct snd_pcm_hw_params *params;
3609 struct snd_pcm_hw_params_old *oparams = NULL;
3610 int err;
3611
3612 params = kmalloc(sizeof(*params), GFP_KERNEL);
3613 if (!params)
3614 return -ENOMEM;
3615
3616 oparams = memdup_user(_oparams, sizeof(*oparams));
3617 if (IS_ERR(oparams)) {
3618 err = PTR_ERR(oparams);
3619 goto out;
3620 }
3621 snd_pcm_hw_convert_from_old_params(params, oparams);
3622 err = snd_pcm_hw_refine(substream, params);
3623 if (err < 0)
3624 goto out_old;
3625
3626 err = fixup_unreferenced_params(substream, params);
3627 if (err < 0)
3628 goto out_old;
3629
3630 snd_pcm_hw_convert_to_old_params(oparams, params);
3631 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3632 err = -EFAULT;
3633out_old:
3634 kfree(oparams);
3635out:
3636 kfree(params);
3637 return err;
3638}
3639
3640static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3641 struct snd_pcm_hw_params_old __user * _oparams)
3642{
3643 struct snd_pcm_hw_params *params;
3644 struct snd_pcm_hw_params_old *oparams = NULL;
3645 int err;
3646
3647 params = kmalloc(sizeof(*params), GFP_KERNEL);
3648 if (!params)
3649 return -ENOMEM;
3650
3651 oparams = memdup_user(_oparams, sizeof(*oparams));
3652 if (IS_ERR(oparams)) {
3653 err = PTR_ERR(oparams);
3654 goto out;
3655 }
3656
3657 snd_pcm_hw_convert_from_old_params(params, oparams);
3658 err = snd_pcm_hw_params(substream, params);
3659 if (err < 0)
3660 goto out_old;
3661
3662 snd_pcm_hw_convert_to_old_params(oparams, params);
3663 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3664 err = -EFAULT;
3665out_old:
3666 kfree(oparams);
3667out:
3668 kfree(params);
3669 return err;
3670}
3671#endif /* CONFIG_SND_SUPPORT_OLD_API */
3672
3673#ifndef CONFIG_MMU
3674static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3675 unsigned long addr,
3676 unsigned long len,
3677 unsigned long pgoff,
3678 unsigned long flags)
3679{
3680 struct snd_pcm_file *pcm_file = file->private_data;
3681 struct snd_pcm_substream *substream = pcm_file->substream;
3682 struct snd_pcm_runtime *runtime = substream->runtime;
3683 unsigned long offset = pgoff << PAGE_SHIFT;
3684
3685 switch (offset) {
3686 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3687 return (unsigned long)runtime->status;
3688 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3689 return (unsigned long)runtime->control;
3690 default:
3691 return (unsigned long)runtime->dma_area + offset;
3692 }
3693}
3694#else
3695# define snd_pcm_get_unmapped_area NULL
3696#endif
3697
3698/*
3699 * Register section
3700 */
3701
3702const struct file_operations snd_pcm_f_ops[2] = {
3703 {
3704 .owner = THIS_MODULE,
3705 .write = snd_pcm_write,
3706 .write_iter = snd_pcm_writev,
3707 .open = snd_pcm_playback_open,
3708 .release = snd_pcm_release,
3709 .llseek = no_llseek,
3710 .poll = snd_pcm_playback_poll,
3711 .unlocked_ioctl = snd_pcm_ioctl,
3712 .compat_ioctl = snd_pcm_ioctl_compat,
3713 .mmap = snd_pcm_mmap,
3714 .fasync = snd_pcm_fasync,
3715 .get_unmapped_area = snd_pcm_get_unmapped_area,
3716 },
3717 {
3718 .owner = THIS_MODULE,
3719 .read = snd_pcm_read,
3720 .read_iter = snd_pcm_readv,
3721 .open = snd_pcm_capture_open,
3722 .release = snd_pcm_release,
3723 .llseek = no_llseek,
3724 .poll = snd_pcm_capture_poll,
3725 .unlocked_ioctl = snd_pcm_ioctl,
3726 .compat_ioctl = snd_pcm_ioctl_compat,
3727 .mmap = snd_pcm_mmap,
3728 .fasync = snd_pcm_fasync,
3729 .get_unmapped_area = snd_pcm_get_unmapped_area,
3730 }
3731};
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/mm.h>
23#include <linux/file.h>
24#include <linux/slab.h>
25#include <linux/time.h>
26#include <linux/pm_qos_params.h>
27#include <linux/uio.h>
28#include <linux/dma-mapping.h>
29#include <sound/core.h>
30#include <sound/control.h>
31#include <sound/info.h>
32#include <sound/pcm.h>
33#include <sound/pcm_params.h>
34#include <sound/timer.h>
35#include <sound/minors.h>
36#include <asm/io.h>
37#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
38#include <dma-coherence.h>
39#endif
40
41/*
42 * Compatibility
43 */
44
45struct snd_pcm_hw_params_old {
46 unsigned int flags;
47 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
48 SNDRV_PCM_HW_PARAM_ACCESS + 1];
49 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
50 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
51 unsigned int rmask;
52 unsigned int cmask;
53 unsigned int info;
54 unsigned int msbits;
55 unsigned int rate_num;
56 unsigned int rate_den;
57 snd_pcm_uframes_t fifo_size;
58 unsigned char reserved[64];
59};
60
61#ifdef CONFIG_SND_SUPPORT_OLD_API
62#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
63#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
64
65static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params_old __user * _oparams);
69#endif
70static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
71
72/*
73 *
74 */
75
76DEFINE_RWLOCK(snd_pcm_link_rwlock);
77EXPORT_SYMBOL(snd_pcm_link_rwlock);
78
79static DECLARE_RWSEM(snd_pcm_link_rwsem);
80
81static inline mm_segment_t snd_enter_user(void)
82{
83 mm_segment_t fs = get_fs();
84 set_fs(get_ds());
85 return fs;
86}
87
88static inline void snd_leave_user(mm_segment_t fs)
89{
90 set_fs(fs);
91}
92
93
94
95int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
96{
97 struct snd_pcm_runtime *runtime;
98 struct snd_pcm *pcm = substream->pcm;
99 struct snd_pcm_str *pstr = substream->pstr;
100
101 memset(info, 0, sizeof(*info));
102 info->card = pcm->card->number;
103 info->device = pcm->device;
104 info->stream = substream->stream;
105 info->subdevice = substream->number;
106 strlcpy(info->id, pcm->id, sizeof(info->id));
107 strlcpy(info->name, pcm->name, sizeof(info->name));
108 info->dev_class = pcm->dev_class;
109 info->dev_subclass = pcm->dev_subclass;
110 info->subdevices_count = pstr->substream_count;
111 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
112 strlcpy(info->subname, substream->name, sizeof(info->subname));
113 runtime = substream->runtime;
114 /* AB: FIXME!!! This is definitely nonsense */
115 if (runtime) {
116 info->sync = runtime->sync;
117 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
118 }
119 return 0;
120}
121
122int snd_pcm_info_user(struct snd_pcm_substream *substream,
123 struct snd_pcm_info __user * _info)
124{
125 struct snd_pcm_info *info;
126 int err;
127
128 info = kmalloc(sizeof(*info), GFP_KERNEL);
129 if (! info)
130 return -ENOMEM;
131 err = snd_pcm_info(substream, info);
132 if (err >= 0) {
133 if (copy_to_user(_info, info, sizeof(*info)))
134 err = -EFAULT;
135 }
136 kfree(info);
137 return err;
138}
139
140#undef RULES_DEBUG
141
142#ifdef RULES_DEBUG
143#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
144static const char * const snd_pcm_hw_param_names[] = {
145 HW_PARAM(ACCESS),
146 HW_PARAM(FORMAT),
147 HW_PARAM(SUBFORMAT),
148 HW_PARAM(SAMPLE_BITS),
149 HW_PARAM(FRAME_BITS),
150 HW_PARAM(CHANNELS),
151 HW_PARAM(RATE),
152 HW_PARAM(PERIOD_TIME),
153 HW_PARAM(PERIOD_SIZE),
154 HW_PARAM(PERIOD_BYTES),
155 HW_PARAM(PERIODS),
156 HW_PARAM(BUFFER_TIME),
157 HW_PARAM(BUFFER_SIZE),
158 HW_PARAM(BUFFER_BYTES),
159 HW_PARAM(TICK_TIME),
160};
161#endif
162
163int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
164 struct snd_pcm_hw_params *params)
165{
166 unsigned int k;
167 struct snd_pcm_hardware *hw;
168 struct snd_interval *i = NULL;
169 struct snd_mask *m = NULL;
170 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
171 unsigned int rstamps[constrs->rules_num];
172 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
173 unsigned int stamp = 2;
174 int changed, again;
175
176 params->info = 0;
177 params->fifo_size = 0;
178 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
179 params->msbits = 0;
180 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
181 params->rate_num = 0;
182 params->rate_den = 0;
183 }
184
185 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
186 m = hw_param_mask(params, k);
187 if (snd_mask_empty(m))
188 return -EINVAL;
189 if (!(params->rmask & (1 << k)))
190 continue;
191#ifdef RULES_DEBUG
192 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
193 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
194#endif
195 changed = snd_mask_refine(m, constrs_mask(constrs, k));
196#ifdef RULES_DEBUG
197 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
198#endif
199 if (changed)
200 params->cmask |= 1 << k;
201 if (changed < 0)
202 return changed;
203 }
204
205 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
206 i = hw_param_interval(params, k);
207 if (snd_interval_empty(i))
208 return -EINVAL;
209 if (!(params->rmask & (1 << k)))
210 continue;
211#ifdef RULES_DEBUG
212 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
213 if (i->empty)
214 printk("empty");
215 else
216 printk("%c%u %u%c",
217 i->openmin ? '(' : '[', i->min,
218 i->max, i->openmax ? ')' : ']');
219 printk(" -> ");
220#endif
221 changed = snd_interval_refine(i, constrs_interval(constrs, k));
222#ifdef RULES_DEBUG
223 if (i->empty)
224 printk("empty\n");
225 else
226 printk("%c%u %u%c\n",
227 i->openmin ? '(' : '[', i->min,
228 i->max, i->openmax ? ')' : ']');
229#endif
230 if (changed)
231 params->cmask |= 1 << k;
232 if (changed < 0)
233 return changed;
234 }
235
236 for (k = 0; k < constrs->rules_num; k++)
237 rstamps[k] = 0;
238 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
239 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
240 do {
241 again = 0;
242 for (k = 0; k < constrs->rules_num; k++) {
243 struct snd_pcm_hw_rule *r = &constrs->rules[k];
244 unsigned int d;
245 int doit = 0;
246 if (r->cond && !(r->cond & params->flags))
247 continue;
248 for (d = 0; r->deps[d] >= 0; d++) {
249 if (vstamps[r->deps[d]] > rstamps[k]) {
250 doit = 1;
251 break;
252 }
253 }
254 if (!doit)
255 continue;
256#ifdef RULES_DEBUG
257 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
258 if (r->var >= 0) {
259 printk("%s = ", snd_pcm_hw_param_names[r->var]);
260 if (hw_is_mask(r->var)) {
261 m = hw_param_mask(params, r->var);
262 printk("%x", *m->bits);
263 } else {
264 i = hw_param_interval(params, r->var);
265 if (i->empty)
266 printk("empty");
267 else
268 printk("%c%u %u%c",
269 i->openmin ? '(' : '[', i->min,
270 i->max, i->openmax ? ')' : ']');
271 }
272 }
273#endif
274 changed = r->func(params, r);
275#ifdef RULES_DEBUG
276 if (r->var >= 0) {
277 printk(" -> ");
278 if (hw_is_mask(r->var))
279 printk("%x", *m->bits);
280 else {
281 if (i->empty)
282 printk("empty");
283 else
284 printk("%c%u %u%c",
285 i->openmin ? '(' : '[', i->min,
286 i->max, i->openmax ? ')' : ']');
287 }
288 }
289 printk("\n");
290#endif
291 rstamps[k] = stamp;
292 if (changed && r->var >= 0) {
293 params->cmask |= (1 << r->var);
294 vstamps[r->var] = stamp;
295 again = 1;
296 }
297 if (changed < 0)
298 return changed;
299 stamp++;
300 }
301 } while (again);
302 if (!params->msbits) {
303 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
304 if (snd_interval_single(i))
305 params->msbits = snd_interval_value(i);
306 }
307
308 if (!params->rate_den) {
309 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
310 if (snd_interval_single(i)) {
311 params->rate_num = snd_interval_value(i);
312 params->rate_den = 1;
313 }
314 }
315
316 hw = &substream->runtime->hw;
317 if (!params->info)
318 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
319 if (!params->fifo_size) {
320 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
321 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
322 if (snd_mask_min(m) == snd_mask_max(m) &&
323 snd_interval_min(i) == snd_interval_max(i)) {
324 changed = substream->ops->ioctl(substream,
325 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
326 if (changed < 0)
327 return changed;
328 }
329 }
330 params->rmask = 0;
331 return 0;
332}
333
334EXPORT_SYMBOL(snd_pcm_hw_refine);
335
336static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
337 struct snd_pcm_hw_params __user * _params)
338{
339 struct snd_pcm_hw_params *params;
340 int err;
341
342 params = memdup_user(_params, sizeof(*params));
343 if (IS_ERR(params))
344 return PTR_ERR(params);
345
346 err = snd_pcm_hw_refine(substream, params);
347 if (copy_to_user(_params, params, sizeof(*params))) {
348 if (!err)
349 err = -EFAULT;
350 }
351
352 kfree(params);
353 return err;
354}
355
356static int period_to_usecs(struct snd_pcm_runtime *runtime)
357{
358 int usecs;
359
360 if (! runtime->rate)
361 return -1; /* invalid */
362
363 /* take 75% of period time as the deadline */
364 usecs = (750000 / runtime->rate) * runtime->period_size;
365 usecs += ((750000 % runtime->rate) * runtime->period_size) /
366 runtime->rate;
367
368 return usecs;
369}
370
371static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
372 struct snd_pcm_hw_params *params)
373{
374 struct snd_pcm_runtime *runtime;
375 int err, usecs;
376 unsigned int bits;
377 snd_pcm_uframes_t frames;
378
379 if (PCM_RUNTIME_CHECK(substream))
380 return -ENXIO;
381 runtime = substream->runtime;
382 snd_pcm_stream_lock_irq(substream);
383 switch (runtime->status->state) {
384 case SNDRV_PCM_STATE_OPEN:
385 case SNDRV_PCM_STATE_SETUP:
386 case SNDRV_PCM_STATE_PREPARED:
387 break;
388 default:
389 snd_pcm_stream_unlock_irq(substream);
390 return -EBADFD;
391 }
392 snd_pcm_stream_unlock_irq(substream);
393#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394 if (!substream->oss.oss)
395#endif
396 if (atomic_read(&substream->mmap_count))
397 return -EBADFD;
398
399 params->rmask = ~0U;
400 err = snd_pcm_hw_refine(substream, params);
401 if (err < 0)
402 goto _error;
403
404 err = snd_pcm_hw_params_choose(substream, params);
405 if (err < 0)
406 goto _error;
407
408 if (substream->ops->hw_params != NULL) {
409 err = substream->ops->hw_params(substream, params);
410 if (err < 0)
411 goto _error;
412 }
413
414 runtime->access = params_access(params);
415 runtime->format = params_format(params);
416 runtime->subformat = params_subformat(params);
417 runtime->channels = params_channels(params);
418 runtime->rate = params_rate(params);
419 runtime->period_size = params_period_size(params);
420 runtime->periods = params_periods(params);
421 runtime->buffer_size = params_buffer_size(params);
422 runtime->info = params->info;
423 runtime->rate_num = params->rate_num;
424 runtime->rate_den = params->rate_den;
425 runtime->no_period_wakeup =
426 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
427 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
428
429 bits = snd_pcm_format_physical_width(runtime->format);
430 runtime->sample_bits = bits;
431 bits *= runtime->channels;
432 runtime->frame_bits = bits;
433 frames = 1;
434 while (bits % 8 != 0) {
435 bits *= 2;
436 frames *= 2;
437 }
438 runtime->byte_align = bits / 8;
439 runtime->min_align = frames;
440
441 /* Default sw params */
442 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
443 runtime->period_step = 1;
444 runtime->control->avail_min = runtime->period_size;
445 runtime->start_threshold = 1;
446 runtime->stop_threshold = runtime->buffer_size;
447 runtime->silence_threshold = 0;
448 runtime->silence_size = 0;
449 runtime->boundary = runtime->buffer_size;
450 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
451 runtime->boundary *= 2;
452
453 snd_pcm_timer_resolution_change(substream);
454 runtime->status->state = SNDRV_PCM_STATE_SETUP;
455
456 if (pm_qos_request_active(&substream->latency_pm_qos_req))
457 pm_qos_remove_request(&substream->latency_pm_qos_req);
458 if ((usecs = period_to_usecs(runtime)) >= 0)
459 pm_qos_add_request(&substream->latency_pm_qos_req,
460 PM_QOS_CPU_DMA_LATENCY, usecs);
461 return 0;
462 _error:
463 /* hardware might be unusable from this time,
464 so we force application to retry to set
465 the correct hardware parameter settings */
466 runtime->status->state = SNDRV_PCM_STATE_OPEN;
467 if (substream->ops->hw_free != NULL)
468 substream->ops->hw_free(substream);
469 return err;
470}
471
472static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
473 struct snd_pcm_hw_params __user * _params)
474{
475 struct snd_pcm_hw_params *params;
476 int err;
477
478 params = memdup_user(_params, sizeof(*params));
479 if (IS_ERR(params))
480 return PTR_ERR(params);
481
482 err = snd_pcm_hw_params(substream, params);
483 if (copy_to_user(_params, params, sizeof(*params))) {
484 if (!err)
485 err = -EFAULT;
486 }
487
488 kfree(params);
489 return err;
490}
491
492static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
493{
494 struct snd_pcm_runtime *runtime;
495 int result = 0;
496
497 if (PCM_RUNTIME_CHECK(substream))
498 return -ENXIO;
499 runtime = substream->runtime;
500 snd_pcm_stream_lock_irq(substream);
501 switch (runtime->status->state) {
502 case SNDRV_PCM_STATE_SETUP:
503 case SNDRV_PCM_STATE_PREPARED:
504 break;
505 default:
506 snd_pcm_stream_unlock_irq(substream);
507 return -EBADFD;
508 }
509 snd_pcm_stream_unlock_irq(substream);
510 if (atomic_read(&substream->mmap_count))
511 return -EBADFD;
512 if (substream->ops->hw_free)
513 result = substream->ops->hw_free(substream);
514 runtime->status->state = SNDRV_PCM_STATE_OPEN;
515 pm_qos_remove_request(&substream->latency_pm_qos_req);
516 return result;
517}
518
519static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
520 struct snd_pcm_sw_params *params)
521{
522 struct snd_pcm_runtime *runtime;
523 int err;
524
525 if (PCM_RUNTIME_CHECK(substream))
526 return -ENXIO;
527 runtime = substream->runtime;
528 snd_pcm_stream_lock_irq(substream);
529 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
530 snd_pcm_stream_unlock_irq(substream);
531 return -EBADFD;
532 }
533 snd_pcm_stream_unlock_irq(substream);
534
535 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
536 return -EINVAL;
537 if (params->avail_min == 0)
538 return -EINVAL;
539 if (params->silence_size >= runtime->boundary) {
540 if (params->silence_threshold != 0)
541 return -EINVAL;
542 } else {
543 if (params->silence_size > params->silence_threshold)
544 return -EINVAL;
545 if (params->silence_threshold > runtime->buffer_size)
546 return -EINVAL;
547 }
548 err = 0;
549 snd_pcm_stream_lock_irq(substream);
550 runtime->tstamp_mode = params->tstamp_mode;
551 runtime->period_step = params->period_step;
552 runtime->control->avail_min = params->avail_min;
553 runtime->start_threshold = params->start_threshold;
554 runtime->stop_threshold = params->stop_threshold;
555 runtime->silence_threshold = params->silence_threshold;
556 runtime->silence_size = params->silence_size;
557 params->boundary = runtime->boundary;
558 if (snd_pcm_running(substream)) {
559 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
560 runtime->silence_size > 0)
561 snd_pcm_playback_silence(substream, ULONG_MAX);
562 err = snd_pcm_update_state(substream, runtime);
563 }
564 snd_pcm_stream_unlock_irq(substream);
565 return err;
566}
567
568static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
569 struct snd_pcm_sw_params __user * _params)
570{
571 struct snd_pcm_sw_params params;
572 int err;
573 if (copy_from_user(¶ms, _params, sizeof(params)))
574 return -EFAULT;
575 err = snd_pcm_sw_params(substream, ¶ms);
576 if (copy_to_user(_params, ¶ms, sizeof(params)))
577 return -EFAULT;
578 return err;
579}
580
581int snd_pcm_status(struct snd_pcm_substream *substream,
582 struct snd_pcm_status *status)
583{
584 struct snd_pcm_runtime *runtime = substream->runtime;
585
586 snd_pcm_stream_lock_irq(substream);
587 status->state = runtime->status->state;
588 status->suspended_state = runtime->status->suspended_state;
589 if (status->state == SNDRV_PCM_STATE_OPEN)
590 goto _end;
591 status->trigger_tstamp = runtime->trigger_tstamp;
592 if (snd_pcm_running(substream)) {
593 snd_pcm_update_hw_ptr(substream);
594 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
595 status->tstamp = runtime->status->tstamp;
596 goto _tstamp_end;
597 }
598 }
599 snd_pcm_gettime(runtime, &status->tstamp);
600 _tstamp_end:
601 status->appl_ptr = runtime->control->appl_ptr;
602 status->hw_ptr = runtime->status->hw_ptr;
603 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
604 status->avail = snd_pcm_playback_avail(runtime);
605 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
606 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
607 status->delay = runtime->buffer_size - status->avail;
608 status->delay += runtime->delay;
609 } else
610 status->delay = 0;
611 } else {
612 status->avail = snd_pcm_capture_avail(runtime);
613 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
614 status->delay = status->avail + runtime->delay;
615 else
616 status->delay = 0;
617 }
618 status->avail_max = runtime->avail_max;
619 status->overrange = runtime->overrange;
620 runtime->avail_max = 0;
621 runtime->overrange = 0;
622 _end:
623 snd_pcm_stream_unlock_irq(substream);
624 return 0;
625}
626
627static int snd_pcm_status_user(struct snd_pcm_substream *substream,
628 struct snd_pcm_status __user * _status)
629{
630 struct snd_pcm_status status;
631 int res;
632
633 memset(&status, 0, sizeof(status));
634 res = snd_pcm_status(substream, &status);
635 if (res < 0)
636 return res;
637 if (copy_to_user(_status, &status, sizeof(status)))
638 return -EFAULT;
639 return 0;
640}
641
642static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
643 struct snd_pcm_channel_info * info)
644{
645 struct snd_pcm_runtime *runtime;
646 unsigned int channel;
647
648 channel = info->channel;
649 runtime = substream->runtime;
650 snd_pcm_stream_lock_irq(substream);
651 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
652 snd_pcm_stream_unlock_irq(substream);
653 return -EBADFD;
654 }
655 snd_pcm_stream_unlock_irq(substream);
656 if (channel >= runtime->channels)
657 return -EINVAL;
658 memset(info, 0, sizeof(*info));
659 info->channel = channel;
660 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
661}
662
663static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
664 struct snd_pcm_channel_info __user * _info)
665{
666 struct snd_pcm_channel_info info;
667 int res;
668
669 if (copy_from_user(&info, _info, sizeof(info)))
670 return -EFAULT;
671 res = snd_pcm_channel_info(substream, &info);
672 if (res < 0)
673 return res;
674 if (copy_to_user(_info, &info, sizeof(info)))
675 return -EFAULT;
676 return 0;
677}
678
679static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
680{
681 struct snd_pcm_runtime *runtime = substream->runtime;
682 if (runtime->trigger_master == NULL)
683 return;
684 if (runtime->trigger_master == substream) {
685 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
686 } else {
687 snd_pcm_trigger_tstamp(runtime->trigger_master);
688 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
689 }
690 runtime->trigger_master = NULL;
691}
692
693struct action_ops {
694 int (*pre_action)(struct snd_pcm_substream *substream, int state);
695 int (*do_action)(struct snd_pcm_substream *substream, int state);
696 void (*undo_action)(struct snd_pcm_substream *substream, int state);
697 void (*post_action)(struct snd_pcm_substream *substream, int state);
698};
699
700/*
701 * this functions is core for handling of linked stream
702 * Note: the stream state might be changed also on failure
703 * Note2: call with calling stream lock + link lock
704 */
705static int snd_pcm_action_group(struct action_ops *ops,
706 struct snd_pcm_substream *substream,
707 int state, int do_lock)
708{
709 struct snd_pcm_substream *s = NULL;
710 struct snd_pcm_substream *s1;
711 int res = 0;
712
713 snd_pcm_group_for_each_entry(s, substream) {
714 if (do_lock && s != substream)
715 spin_lock_nested(&s->self_group.lock,
716 SINGLE_DEPTH_NESTING);
717 res = ops->pre_action(s, state);
718 if (res < 0)
719 goto _unlock;
720 }
721 snd_pcm_group_for_each_entry(s, substream) {
722 res = ops->do_action(s, state);
723 if (res < 0) {
724 if (ops->undo_action) {
725 snd_pcm_group_for_each_entry(s1, substream) {
726 if (s1 == s) /* failed stream */
727 break;
728 ops->undo_action(s1, state);
729 }
730 }
731 s = NULL; /* unlock all */
732 goto _unlock;
733 }
734 }
735 snd_pcm_group_for_each_entry(s, substream) {
736 ops->post_action(s, state);
737 }
738 _unlock:
739 if (do_lock) {
740 /* unlock streams */
741 snd_pcm_group_for_each_entry(s1, substream) {
742 if (s1 != substream)
743 spin_unlock(&s1->self_group.lock);
744 if (s1 == s) /* end */
745 break;
746 }
747 }
748 return res;
749}
750
751/*
752 * Note: call with stream lock
753 */
754static int snd_pcm_action_single(struct action_ops *ops,
755 struct snd_pcm_substream *substream,
756 int state)
757{
758 int res;
759
760 res = ops->pre_action(substream, state);
761 if (res < 0)
762 return res;
763 res = ops->do_action(substream, state);
764 if (res == 0)
765 ops->post_action(substream, state);
766 else if (ops->undo_action)
767 ops->undo_action(substream, state);
768 return res;
769}
770
771/*
772 * Note: call with stream lock
773 */
774static int snd_pcm_action(struct action_ops *ops,
775 struct snd_pcm_substream *substream,
776 int state)
777{
778 int res;
779
780 if (snd_pcm_stream_linked(substream)) {
781 if (!spin_trylock(&substream->group->lock)) {
782 spin_unlock(&substream->self_group.lock);
783 spin_lock(&substream->group->lock);
784 spin_lock(&substream->self_group.lock);
785 }
786 res = snd_pcm_action_group(ops, substream, state, 1);
787 spin_unlock(&substream->group->lock);
788 } else {
789 res = snd_pcm_action_single(ops, substream, state);
790 }
791 return res;
792}
793
794/*
795 * Note: don't use any locks before
796 */
797static int snd_pcm_action_lock_irq(struct action_ops *ops,
798 struct snd_pcm_substream *substream,
799 int state)
800{
801 int res;
802
803 read_lock_irq(&snd_pcm_link_rwlock);
804 if (snd_pcm_stream_linked(substream)) {
805 spin_lock(&substream->group->lock);
806 spin_lock(&substream->self_group.lock);
807 res = snd_pcm_action_group(ops, substream, state, 1);
808 spin_unlock(&substream->self_group.lock);
809 spin_unlock(&substream->group->lock);
810 } else {
811 spin_lock(&substream->self_group.lock);
812 res = snd_pcm_action_single(ops, substream, state);
813 spin_unlock(&substream->self_group.lock);
814 }
815 read_unlock_irq(&snd_pcm_link_rwlock);
816 return res;
817}
818
819/*
820 */
821static int snd_pcm_action_nonatomic(struct action_ops *ops,
822 struct snd_pcm_substream *substream,
823 int state)
824{
825 int res;
826
827 down_read(&snd_pcm_link_rwsem);
828 if (snd_pcm_stream_linked(substream))
829 res = snd_pcm_action_group(ops, substream, state, 0);
830 else
831 res = snd_pcm_action_single(ops, substream, state);
832 up_read(&snd_pcm_link_rwsem);
833 return res;
834}
835
836/*
837 * start callbacks
838 */
839static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
840{
841 struct snd_pcm_runtime *runtime = substream->runtime;
842 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
843 return -EBADFD;
844 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
845 !snd_pcm_playback_data(substream))
846 return -EPIPE;
847 runtime->trigger_master = substream;
848 return 0;
849}
850
851static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
852{
853 if (substream->runtime->trigger_master != substream)
854 return 0;
855 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
856}
857
858static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
859{
860 if (substream->runtime->trigger_master == substream)
861 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
862}
863
864static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
865{
866 struct snd_pcm_runtime *runtime = substream->runtime;
867 snd_pcm_trigger_tstamp(substream);
868 runtime->hw_ptr_jiffies = jiffies;
869 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
870 runtime->rate;
871 runtime->status->state = state;
872 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
873 runtime->silence_size > 0)
874 snd_pcm_playback_silence(substream, ULONG_MAX);
875 if (substream->timer)
876 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
877 &runtime->trigger_tstamp);
878}
879
880static struct action_ops snd_pcm_action_start = {
881 .pre_action = snd_pcm_pre_start,
882 .do_action = snd_pcm_do_start,
883 .undo_action = snd_pcm_undo_start,
884 .post_action = snd_pcm_post_start
885};
886
887/**
888 * snd_pcm_start - start all linked streams
889 * @substream: the PCM substream instance
890 */
891int snd_pcm_start(struct snd_pcm_substream *substream)
892{
893 return snd_pcm_action(&snd_pcm_action_start, substream,
894 SNDRV_PCM_STATE_RUNNING);
895}
896
897/*
898 * stop callbacks
899 */
900static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
901{
902 struct snd_pcm_runtime *runtime = substream->runtime;
903 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
904 return -EBADFD;
905 runtime->trigger_master = substream;
906 return 0;
907}
908
909static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
910{
911 if (substream->runtime->trigger_master == substream &&
912 snd_pcm_running(substream))
913 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
914 return 0; /* unconditonally stop all substreams */
915}
916
917static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
918{
919 struct snd_pcm_runtime *runtime = substream->runtime;
920 if (runtime->status->state != state) {
921 snd_pcm_trigger_tstamp(substream);
922 if (substream->timer)
923 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
924 &runtime->trigger_tstamp);
925 runtime->status->state = state;
926 }
927 wake_up(&runtime->sleep);
928 wake_up(&runtime->tsleep);
929}
930
931static struct action_ops snd_pcm_action_stop = {
932 .pre_action = snd_pcm_pre_stop,
933 .do_action = snd_pcm_do_stop,
934 .post_action = snd_pcm_post_stop
935};
936
937/**
938 * snd_pcm_stop - try to stop all running streams in the substream group
939 * @substream: the PCM substream instance
940 * @state: PCM state after stopping the stream
941 *
942 * The state of each stream is then changed to the given state unconditionally.
943 */
944int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
945{
946 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
947}
948
949EXPORT_SYMBOL(snd_pcm_stop);
950
951/**
952 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
953 * @substream: the PCM substream
954 *
955 * After stopping, the state is changed to SETUP.
956 * Unlike snd_pcm_stop(), this affects only the given stream.
957 */
958int snd_pcm_drain_done(struct snd_pcm_substream *substream)
959{
960 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
961 SNDRV_PCM_STATE_SETUP);
962}
963
964/*
965 * pause callbacks
966 */
967static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
968{
969 struct snd_pcm_runtime *runtime = substream->runtime;
970 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
971 return -ENOSYS;
972 if (push) {
973 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
974 return -EBADFD;
975 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
976 return -EBADFD;
977 runtime->trigger_master = substream;
978 return 0;
979}
980
981static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
982{
983 if (substream->runtime->trigger_master != substream)
984 return 0;
985 /* some drivers might use hw_ptr to recover from the pause -
986 update the hw_ptr now */
987 if (push)
988 snd_pcm_update_hw_ptr(substream);
989 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
990 * a delta between the current jiffies, this gives a large enough
991 * delta, effectively to skip the check once.
992 */
993 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
994 return substream->ops->trigger(substream,
995 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
996 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
997}
998
999static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1000{
1001 if (substream->runtime->trigger_master == substream)
1002 substream->ops->trigger(substream,
1003 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1004 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1005}
1006
1007static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1008{
1009 struct snd_pcm_runtime *runtime = substream->runtime;
1010 snd_pcm_trigger_tstamp(substream);
1011 if (push) {
1012 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1013 if (substream->timer)
1014 snd_timer_notify(substream->timer,
1015 SNDRV_TIMER_EVENT_MPAUSE,
1016 &runtime->trigger_tstamp);
1017 wake_up(&runtime->sleep);
1018 wake_up(&runtime->tsleep);
1019 } else {
1020 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1021 if (substream->timer)
1022 snd_timer_notify(substream->timer,
1023 SNDRV_TIMER_EVENT_MCONTINUE,
1024 &runtime->trigger_tstamp);
1025 }
1026}
1027
1028static struct action_ops snd_pcm_action_pause = {
1029 .pre_action = snd_pcm_pre_pause,
1030 .do_action = snd_pcm_do_pause,
1031 .undo_action = snd_pcm_undo_pause,
1032 .post_action = snd_pcm_post_pause
1033};
1034
1035/*
1036 * Push/release the pause for all linked streams.
1037 */
1038static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1039{
1040 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1041}
1042
1043#ifdef CONFIG_PM
1044/* suspend */
1045
1046static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1047{
1048 struct snd_pcm_runtime *runtime = substream->runtime;
1049 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1050 return -EBUSY;
1051 runtime->trigger_master = substream;
1052 return 0;
1053}
1054
1055static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1056{
1057 struct snd_pcm_runtime *runtime = substream->runtime;
1058 if (runtime->trigger_master != substream)
1059 return 0;
1060 if (! snd_pcm_running(substream))
1061 return 0;
1062 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1063 return 0; /* suspend unconditionally */
1064}
1065
1066static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1067{
1068 struct snd_pcm_runtime *runtime = substream->runtime;
1069 snd_pcm_trigger_tstamp(substream);
1070 if (substream->timer)
1071 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1072 &runtime->trigger_tstamp);
1073 runtime->status->suspended_state = runtime->status->state;
1074 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1075 wake_up(&runtime->sleep);
1076 wake_up(&runtime->tsleep);
1077}
1078
1079static struct action_ops snd_pcm_action_suspend = {
1080 .pre_action = snd_pcm_pre_suspend,
1081 .do_action = snd_pcm_do_suspend,
1082 .post_action = snd_pcm_post_suspend
1083};
1084
1085/**
1086 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1087 * @substream: the PCM substream
1088 *
1089 * After this call, all streams are changed to SUSPENDED state.
1090 */
1091int snd_pcm_suspend(struct snd_pcm_substream *substream)
1092{
1093 int err;
1094 unsigned long flags;
1095
1096 if (! substream)
1097 return 0;
1098
1099 snd_pcm_stream_lock_irqsave(substream, flags);
1100 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1101 snd_pcm_stream_unlock_irqrestore(substream, flags);
1102 return err;
1103}
1104
1105EXPORT_SYMBOL(snd_pcm_suspend);
1106
1107/**
1108 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1109 * @pcm: the PCM instance
1110 *
1111 * After this call, all streams are changed to SUSPENDED state.
1112 */
1113int snd_pcm_suspend_all(struct snd_pcm *pcm)
1114{
1115 struct snd_pcm_substream *substream;
1116 int stream, err = 0;
1117
1118 if (! pcm)
1119 return 0;
1120
1121 for (stream = 0; stream < 2; stream++) {
1122 for (substream = pcm->streams[stream].substream;
1123 substream; substream = substream->next) {
1124 /* FIXME: the open/close code should lock this as well */
1125 if (substream->runtime == NULL)
1126 continue;
1127 err = snd_pcm_suspend(substream);
1128 if (err < 0 && err != -EBUSY)
1129 return err;
1130 }
1131 }
1132 return 0;
1133}
1134
1135EXPORT_SYMBOL(snd_pcm_suspend_all);
1136
1137/* resume */
1138
1139static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1140{
1141 struct snd_pcm_runtime *runtime = substream->runtime;
1142 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1143 return -ENOSYS;
1144 runtime->trigger_master = substream;
1145 return 0;
1146}
1147
1148static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1149{
1150 struct snd_pcm_runtime *runtime = substream->runtime;
1151 if (runtime->trigger_master != substream)
1152 return 0;
1153 /* DMA not running previously? */
1154 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1155 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1156 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1157 return 0;
1158 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1159}
1160
1161static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1162{
1163 if (substream->runtime->trigger_master == substream &&
1164 snd_pcm_running(substream))
1165 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1166}
1167
1168static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1169{
1170 struct snd_pcm_runtime *runtime = substream->runtime;
1171 snd_pcm_trigger_tstamp(substream);
1172 if (substream->timer)
1173 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1174 &runtime->trigger_tstamp);
1175 runtime->status->state = runtime->status->suspended_state;
1176}
1177
1178static struct action_ops snd_pcm_action_resume = {
1179 .pre_action = snd_pcm_pre_resume,
1180 .do_action = snd_pcm_do_resume,
1181 .undo_action = snd_pcm_undo_resume,
1182 .post_action = snd_pcm_post_resume
1183};
1184
1185static int snd_pcm_resume(struct snd_pcm_substream *substream)
1186{
1187 struct snd_card *card = substream->pcm->card;
1188 int res;
1189
1190 snd_power_lock(card);
1191 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1192 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1193 snd_power_unlock(card);
1194 return res;
1195}
1196
1197#else
1198
1199static int snd_pcm_resume(struct snd_pcm_substream *substream)
1200{
1201 return -ENOSYS;
1202}
1203
1204#endif /* CONFIG_PM */
1205
1206/*
1207 * xrun ioctl
1208 *
1209 * Change the RUNNING stream(s) to XRUN state.
1210 */
1211static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1212{
1213 struct snd_card *card = substream->pcm->card;
1214 struct snd_pcm_runtime *runtime = substream->runtime;
1215 int result;
1216
1217 snd_power_lock(card);
1218 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1219 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1220 if (result < 0)
1221 goto _unlock;
1222 }
1223
1224 snd_pcm_stream_lock_irq(substream);
1225 switch (runtime->status->state) {
1226 case SNDRV_PCM_STATE_XRUN:
1227 result = 0; /* already there */
1228 break;
1229 case SNDRV_PCM_STATE_RUNNING:
1230 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1231 break;
1232 default:
1233 result = -EBADFD;
1234 }
1235 snd_pcm_stream_unlock_irq(substream);
1236 _unlock:
1237 snd_power_unlock(card);
1238 return result;
1239}
1240
1241/*
1242 * reset ioctl
1243 */
1244static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1245{
1246 struct snd_pcm_runtime *runtime = substream->runtime;
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_RUNNING:
1249 case SNDRV_PCM_STATE_PREPARED:
1250 case SNDRV_PCM_STATE_PAUSED:
1251 case SNDRV_PCM_STATE_SUSPENDED:
1252 return 0;
1253 default:
1254 return -EBADFD;
1255 }
1256}
1257
1258static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1259{
1260 struct snd_pcm_runtime *runtime = substream->runtime;
1261 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1262 if (err < 0)
1263 return err;
1264 runtime->hw_ptr_base = 0;
1265 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1266 runtime->status->hw_ptr % runtime->period_size;
1267 runtime->silence_start = runtime->status->hw_ptr;
1268 runtime->silence_filled = 0;
1269 return 0;
1270}
1271
1272static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1273{
1274 struct snd_pcm_runtime *runtime = substream->runtime;
1275 runtime->control->appl_ptr = runtime->status->hw_ptr;
1276 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1277 runtime->silence_size > 0)
1278 snd_pcm_playback_silence(substream, ULONG_MAX);
1279}
1280
1281static struct action_ops snd_pcm_action_reset = {
1282 .pre_action = snd_pcm_pre_reset,
1283 .do_action = snd_pcm_do_reset,
1284 .post_action = snd_pcm_post_reset
1285};
1286
1287static int snd_pcm_reset(struct snd_pcm_substream *substream)
1288{
1289 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1290}
1291
1292/*
1293 * prepare ioctl
1294 */
1295/* we use the second argument for updating f_flags */
1296static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1297 int f_flags)
1298{
1299 struct snd_pcm_runtime *runtime = substream->runtime;
1300 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1301 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1302 return -EBADFD;
1303 if (snd_pcm_running(substream))
1304 return -EBUSY;
1305 substream->f_flags = f_flags;
1306 return 0;
1307}
1308
1309static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1310{
1311 int err;
1312 err = substream->ops->prepare(substream);
1313 if (err < 0)
1314 return err;
1315 return snd_pcm_do_reset(substream, 0);
1316}
1317
1318static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1319{
1320 struct snd_pcm_runtime *runtime = substream->runtime;
1321 runtime->control->appl_ptr = runtime->status->hw_ptr;
1322 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1323}
1324
1325static struct action_ops snd_pcm_action_prepare = {
1326 .pre_action = snd_pcm_pre_prepare,
1327 .do_action = snd_pcm_do_prepare,
1328 .post_action = snd_pcm_post_prepare
1329};
1330
1331/**
1332 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1333 * @substream: the PCM substream instance
1334 * @file: file to refer f_flags
1335 */
1336static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1337 struct file *file)
1338{
1339 int res;
1340 struct snd_card *card = substream->pcm->card;
1341 int f_flags;
1342
1343 if (file)
1344 f_flags = file->f_flags;
1345 else
1346 f_flags = substream->f_flags;
1347
1348 snd_power_lock(card);
1349 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1350 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1351 substream, f_flags);
1352 snd_power_unlock(card);
1353 return res;
1354}
1355
1356/*
1357 * drain ioctl
1358 */
1359
1360static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1361{
1362 substream->runtime->trigger_master = substream;
1363 return 0;
1364}
1365
1366static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1367{
1368 struct snd_pcm_runtime *runtime = substream->runtime;
1369 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1370 switch (runtime->status->state) {
1371 case SNDRV_PCM_STATE_PREPARED:
1372 /* start playback stream if possible */
1373 if (! snd_pcm_playback_empty(substream)) {
1374 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1375 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1376 }
1377 break;
1378 case SNDRV_PCM_STATE_RUNNING:
1379 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1380 break;
1381 default:
1382 break;
1383 }
1384 } else {
1385 /* stop running stream */
1386 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1387 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1388 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1389 snd_pcm_do_stop(substream, new_state);
1390 snd_pcm_post_stop(substream, new_state);
1391 }
1392 }
1393 return 0;
1394}
1395
1396static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1397{
1398}
1399
1400static struct action_ops snd_pcm_action_drain_init = {
1401 .pre_action = snd_pcm_pre_drain_init,
1402 .do_action = snd_pcm_do_drain_init,
1403 .post_action = snd_pcm_post_drain_init
1404};
1405
1406static int snd_pcm_drop(struct snd_pcm_substream *substream);
1407
1408/*
1409 * Drain the stream(s).
1410 * When the substream is linked, sync until the draining of all playback streams
1411 * is finished.
1412 * After this call, all streams are supposed to be either SETUP or DRAINING
1413 * (capture only) state.
1414 */
1415static int snd_pcm_drain(struct snd_pcm_substream *substream,
1416 struct file *file)
1417{
1418 struct snd_card *card;
1419 struct snd_pcm_runtime *runtime;
1420 struct snd_pcm_substream *s;
1421 wait_queue_t wait;
1422 int result = 0;
1423 int nonblock = 0;
1424
1425 card = substream->pcm->card;
1426 runtime = substream->runtime;
1427
1428 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1429 return -EBADFD;
1430
1431 snd_power_lock(card);
1432 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1433 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1434 if (result < 0) {
1435 snd_power_unlock(card);
1436 return result;
1437 }
1438 }
1439
1440 if (file) {
1441 if (file->f_flags & O_NONBLOCK)
1442 nonblock = 1;
1443 } else if (substream->f_flags & O_NONBLOCK)
1444 nonblock = 1;
1445
1446 down_read(&snd_pcm_link_rwsem);
1447 snd_pcm_stream_lock_irq(substream);
1448 /* resume pause */
1449 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1450 snd_pcm_pause(substream, 0);
1451
1452 /* pre-start/stop - all running streams are changed to DRAINING state */
1453 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1454 if (result < 0)
1455 goto unlock;
1456 /* in non-blocking, we don't wait in ioctl but let caller poll */
1457 if (nonblock) {
1458 result = -EAGAIN;
1459 goto unlock;
1460 }
1461
1462 for (;;) {
1463 long tout;
1464 struct snd_pcm_runtime *to_check;
1465 if (signal_pending(current)) {
1466 result = -ERESTARTSYS;
1467 break;
1468 }
1469 /* find a substream to drain */
1470 to_check = NULL;
1471 snd_pcm_group_for_each_entry(s, substream) {
1472 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1473 continue;
1474 runtime = s->runtime;
1475 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1476 to_check = runtime;
1477 break;
1478 }
1479 }
1480 if (!to_check)
1481 break; /* all drained */
1482 init_waitqueue_entry(&wait, current);
1483 add_wait_queue(&to_check->sleep, &wait);
1484 snd_pcm_stream_unlock_irq(substream);
1485 up_read(&snd_pcm_link_rwsem);
1486 snd_power_unlock(card);
1487 if (runtime->no_period_wakeup)
1488 tout = MAX_SCHEDULE_TIMEOUT;
1489 else {
1490 tout = 10;
1491 if (runtime->rate) {
1492 long t = runtime->period_size * 2 / runtime->rate;
1493 tout = max(t, tout);
1494 }
1495 tout = msecs_to_jiffies(tout * 1000);
1496 }
1497 tout = schedule_timeout_interruptible(tout);
1498 snd_power_lock(card);
1499 down_read(&snd_pcm_link_rwsem);
1500 snd_pcm_stream_lock_irq(substream);
1501 remove_wait_queue(&to_check->sleep, &wait);
1502 if (tout == 0) {
1503 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1504 result = -ESTRPIPE;
1505 else {
1506 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1507 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1508 result = -EIO;
1509 }
1510 break;
1511 }
1512 }
1513
1514 unlock:
1515 snd_pcm_stream_unlock_irq(substream);
1516 up_read(&snd_pcm_link_rwsem);
1517 snd_power_unlock(card);
1518
1519 return result;
1520}
1521
1522/*
1523 * drop ioctl
1524 *
1525 * Immediately put all linked substreams into SETUP state.
1526 */
1527static int snd_pcm_drop(struct snd_pcm_substream *substream)
1528{
1529 struct snd_pcm_runtime *runtime;
1530 int result = 0;
1531
1532 if (PCM_RUNTIME_CHECK(substream))
1533 return -ENXIO;
1534 runtime = substream->runtime;
1535
1536 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1537 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1538 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1539 return -EBADFD;
1540
1541 snd_pcm_stream_lock_irq(substream);
1542 /* resume pause */
1543 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1544 snd_pcm_pause(substream, 0);
1545
1546 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1547 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1548 snd_pcm_stream_unlock_irq(substream);
1549
1550 return result;
1551}
1552
1553
1554/* WARNING: Don't forget to fput back the file */
1555static struct file *snd_pcm_file_fd(int fd)
1556{
1557 struct file *file;
1558 struct inode *inode;
1559 unsigned int minor;
1560
1561 file = fget(fd);
1562 if (!file)
1563 return NULL;
1564 inode = file->f_path.dentry->d_inode;
1565 if (!S_ISCHR(inode->i_mode) ||
1566 imajor(inode) != snd_major) {
1567 fput(file);
1568 return NULL;
1569 }
1570 minor = iminor(inode);
1571 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1572 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1573 fput(file);
1574 return NULL;
1575 }
1576 return file;
1577}
1578
1579/*
1580 * PCM link handling
1581 */
1582static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1583{
1584 int res = 0;
1585 struct file *file;
1586 struct snd_pcm_file *pcm_file;
1587 struct snd_pcm_substream *substream1;
1588
1589 file = snd_pcm_file_fd(fd);
1590 if (!file)
1591 return -EBADFD;
1592 pcm_file = file->private_data;
1593 substream1 = pcm_file->substream;
1594 down_write(&snd_pcm_link_rwsem);
1595 write_lock_irq(&snd_pcm_link_rwlock);
1596 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1597 substream->runtime->status->state != substream1->runtime->status->state) {
1598 res = -EBADFD;
1599 goto _end;
1600 }
1601 if (snd_pcm_stream_linked(substream1)) {
1602 res = -EALREADY;
1603 goto _end;
1604 }
1605 if (!snd_pcm_stream_linked(substream)) {
1606 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1607 if (substream->group == NULL) {
1608 res = -ENOMEM;
1609 goto _end;
1610 }
1611 spin_lock_init(&substream->group->lock);
1612 INIT_LIST_HEAD(&substream->group->substreams);
1613 list_add_tail(&substream->link_list, &substream->group->substreams);
1614 substream->group->count = 1;
1615 }
1616 list_add_tail(&substream1->link_list, &substream->group->substreams);
1617 substream->group->count++;
1618 substream1->group = substream->group;
1619 _end:
1620 write_unlock_irq(&snd_pcm_link_rwlock);
1621 up_write(&snd_pcm_link_rwsem);
1622 fput(file);
1623 return res;
1624}
1625
1626static void relink_to_local(struct snd_pcm_substream *substream)
1627{
1628 substream->group = &substream->self_group;
1629 INIT_LIST_HEAD(&substream->self_group.substreams);
1630 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1631}
1632
1633static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1634{
1635 struct snd_pcm_substream *s;
1636 int res = 0;
1637
1638 down_write(&snd_pcm_link_rwsem);
1639 write_lock_irq(&snd_pcm_link_rwlock);
1640 if (!snd_pcm_stream_linked(substream)) {
1641 res = -EALREADY;
1642 goto _end;
1643 }
1644 list_del(&substream->link_list);
1645 substream->group->count--;
1646 if (substream->group->count == 1) { /* detach the last stream, too */
1647 snd_pcm_group_for_each_entry(s, substream) {
1648 relink_to_local(s);
1649 break;
1650 }
1651 kfree(substream->group);
1652 }
1653 relink_to_local(substream);
1654 _end:
1655 write_unlock_irq(&snd_pcm_link_rwlock);
1656 up_write(&snd_pcm_link_rwsem);
1657 return res;
1658}
1659
1660/*
1661 * hw configurator
1662 */
1663static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1664 struct snd_pcm_hw_rule *rule)
1665{
1666 struct snd_interval t;
1667 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1668 hw_param_interval_c(params, rule->deps[1]), &t);
1669 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1670}
1671
1672static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1673 struct snd_pcm_hw_rule *rule)
1674{
1675 struct snd_interval t;
1676 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1677 hw_param_interval_c(params, rule->deps[1]), &t);
1678 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1679}
1680
1681static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1682 struct snd_pcm_hw_rule *rule)
1683{
1684 struct snd_interval t;
1685 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1686 hw_param_interval_c(params, rule->deps[1]),
1687 (unsigned long) rule->private, &t);
1688 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1689}
1690
1691static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1692 struct snd_pcm_hw_rule *rule)
1693{
1694 struct snd_interval t;
1695 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1696 (unsigned long) rule->private,
1697 hw_param_interval_c(params, rule->deps[1]), &t);
1698 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1699}
1700
1701static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1702 struct snd_pcm_hw_rule *rule)
1703{
1704 unsigned int k;
1705 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1706 struct snd_mask m;
1707 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1708 snd_mask_any(&m);
1709 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1710 int bits;
1711 if (! snd_mask_test(mask, k))
1712 continue;
1713 bits = snd_pcm_format_physical_width(k);
1714 if (bits <= 0)
1715 continue; /* ignore invalid formats */
1716 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1717 snd_mask_reset(&m, k);
1718 }
1719 return snd_mask_refine(mask, &m);
1720}
1721
1722static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1723 struct snd_pcm_hw_rule *rule)
1724{
1725 struct snd_interval t;
1726 unsigned int k;
1727 t.min = UINT_MAX;
1728 t.max = 0;
1729 t.openmin = 0;
1730 t.openmax = 0;
1731 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1732 int bits;
1733 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1734 continue;
1735 bits = snd_pcm_format_physical_width(k);
1736 if (bits <= 0)
1737 continue; /* ignore invalid formats */
1738 if (t.min > (unsigned)bits)
1739 t.min = bits;
1740 if (t.max < (unsigned)bits)
1741 t.max = bits;
1742 }
1743 t.integer = 1;
1744 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1745}
1746
1747#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1748#error "Change this table"
1749#endif
1750
1751static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1752 48000, 64000, 88200, 96000, 176400, 192000 };
1753
1754const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1755 .count = ARRAY_SIZE(rates),
1756 .list = rates,
1757};
1758
1759static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1760 struct snd_pcm_hw_rule *rule)
1761{
1762 struct snd_pcm_hardware *hw = rule->private;
1763 return snd_interval_list(hw_param_interval(params, rule->var),
1764 snd_pcm_known_rates.count,
1765 snd_pcm_known_rates.list, hw->rates);
1766}
1767
1768static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1769 struct snd_pcm_hw_rule *rule)
1770{
1771 struct snd_interval t;
1772 struct snd_pcm_substream *substream = rule->private;
1773 t.min = 0;
1774 t.max = substream->buffer_bytes_max;
1775 t.openmin = 0;
1776 t.openmax = 0;
1777 t.integer = 1;
1778 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1779}
1780
1781int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1782{
1783 struct snd_pcm_runtime *runtime = substream->runtime;
1784 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1785 int k, err;
1786
1787 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1788 snd_mask_any(constrs_mask(constrs, k));
1789 }
1790
1791 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1792 snd_interval_any(constrs_interval(constrs, k));
1793 }
1794
1795 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1796 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1797 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1798 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1799 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1800
1801 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1802 snd_pcm_hw_rule_format, NULL,
1803 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1804 if (err < 0)
1805 return err;
1806 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1807 snd_pcm_hw_rule_sample_bits, NULL,
1808 SNDRV_PCM_HW_PARAM_FORMAT,
1809 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1810 if (err < 0)
1811 return err;
1812 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1813 snd_pcm_hw_rule_div, NULL,
1814 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1815 if (err < 0)
1816 return err;
1817 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1818 snd_pcm_hw_rule_mul, NULL,
1819 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1820 if (err < 0)
1821 return err;
1822 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1823 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1824 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1825 if (err < 0)
1826 return err;
1827 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1828 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1829 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1830 if (err < 0)
1831 return err;
1832 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1833 snd_pcm_hw_rule_div, NULL,
1834 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1835 if (err < 0)
1836 return err;
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1838 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1839 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1843 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1844 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1845 if (err < 0)
1846 return err;
1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1848 snd_pcm_hw_rule_div, NULL,
1849 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1850 if (err < 0)
1851 return err;
1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1853 snd_pcm_hw_rule_div, NULL,
1854 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1855 if (err < 0)
1856 return err;
1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1858 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1859 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1860 if (err < 0)
1861 return err;
1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1863 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1864 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1865 if (err < 0)
1866 return err;
1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1868 snd_pcm_hw_rule_mul, NULL,
1869 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1870 if (err < 0)
1871 return err;
1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1873 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1874 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1875 if (err < 0)
1876 return err;
1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1878 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1879 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1880 if (err < 0)
1881 return err;
1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1883 snd_pcm_hw_rule_muldivk, (void*) 8,
1884 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1885 if (err < 0)
1886 return err;
1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1888 snd_pcm_hw_rule_muldivk, (void*) 8,
1889 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1890 if (err < 0)
1891 return err;
1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1893 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1894 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1895 if (err < 0)
1896 return err;
1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1898 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1899 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1900 if (err < 0)
1901 return err;
1902 return 0;
1903}
1904
1905int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1906{
1907 struct snd_pcm_runtime *runtime = substream->runtime;
1908 struct snd_pcm_hardware *hw = &runtime->hw;
1909 int err;
1910 unsigned int mask = 0;
1911
1912 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1913 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1914 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1915 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1916 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1917 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1918 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1919 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1920 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1921 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1922 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1923 }
1924 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1925 if (err < 0)
1926 return err;
1927
1928 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1929 if (err < 0)
1930 return err;
1931
1932 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1933 if (err < 0)
1934 return err;
1935
1936 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1937 hw->channels_min, hw->channels_max);
1938 if (err < 0)
1939 return err;
1940
1941 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1942 hw->rate_min, hw->rate_max);
1943 if (err < 0)
1944 return err;
1945
1946 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1947 hw->period_bytes_min, hw->period_bytes_max);
1948 if (err < 0)
1949 return err;
1950
1951 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1952 hw->periods_min, hw->periods_max);
1953 if (err < 0)
1954 return err;
1955
1956 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1957 hw->period_bytes_min, hw->buffer_bytes_max);
1958 if (err < 0)
1959 return err;
1960
1961 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1962 snd_pcm_hw_rule_buffer_bytes_max, substream,
1963 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1964 if (err < 0)
1965 return err;
1966
1967 /* FIXME: remove */
1968 if (runtime->dma_bytes) {
1969 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1970 if (err < 0)
1971 return -EINVAL;
1972 }
1973
1974 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1975 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1976 snd_pcm_hw_rule_rate, hw,
1977 SNDRV_PCM_HW_PARAM_RATE, -1);
1978 if (err < 0)
1979 return err;
1980 }
1981
1982 /* FIXME: this belong to lowlevel */
1983 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1984
1985 return 0;
1986}
1987
1988static void pcm_release_private(struct snd_pcm_substream *substream)
1989{
1990 snd_pcm_unlink(substream);
1991}
1992
1993void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1994{
1995 substream->ref_count--;
1996 if (substream->ref_count > 0)
1997 return;
1998
1999 snd_pcm_drop(substream);
2000 if (substream->hw_opened) {
2001 if (substream->ops->hw_free != NULL)
2002 substream->ops->hw_free(substream);
2003 substream->ops->close(substream);
2004 substream->hw_opened = 0;
2005 }
2006 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2007 pm_qos_remove_request(&substream->latency_pm_qos_req);
2008 if (substream->pcm_release) {
2009 substream->pcm_release(substream);
2010 substream->pcm_release = NULL;
2011 }
2012 snd_pcm_detach_substream(substream);
2013}
2014
2015EXPORT_SYMBOL(snd_pcm_release_substream);
2016
2017int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2018 struct file *file,
2019 struct snd_pcm_substream **rsubstream)
2020{
2021 struct snd_pcm_substream *substream;
2022 int err;
2023
2024 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2025 if (err < 0)
2026 return err;
2027 if (substream->ref_count > 1) {
2028 *rsubstream = substream;
2029 return 0;
2030 }
2031
2032 err = snd_pcm_hw_constraints_init(substream);
2033 if (err < 0) {
2034 snd_printd("snd_pcm_hw_constraints_init failed\n");
2035 goto error;
2036 }
2037
2038 if ((err = substream->ops->open(substream)) < 0)
2039 goto error;
2040
2041 substream->hw_opened = 1;
2042
2043 err = snd_pcm_hw_constraints_complete(substream);
2044 if (err < 0) {
2045 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2046 goto error;
2047 }
2048
2049 *rsubstream = substream;
2050 return 0;
2051
2052 error:
2053 snd_pcm_release_substream(substream);
2054 return err;
2055}
2056
2057EXPORT_SYMBOL(snd_pcm_open_substream);
2058
2059static int snd_pcm_open_file(struct file *file,
2060 struct snd_pcm *pcm,
2061 int stream,
2062 struct snd_pcm_file **rpcm_file)
2063{
2064 struct snd_pcm_file *pcm_file;
2065 struct snd_pcm_substream *substream;
2066 int err;
2067
2068 if (rpcm_file)
2069 *rpcm_file = NULL;
2070
2071 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2072 if (err < 0)
2073 return err;
2074
2075 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2076 if (pcm_file == NULL) {
2077 snd_pcm_release_substream(substream);
2078 return -ENOMEM;
2079 }
2080 pcm_file->substream = substream;
2081 if (substream->ref_count == 1) {
2082 substream->file = pcm_file;
2083 substream->pcm_release = pcm_release_private;
2084 }
2085 file->private_data = pcm_file;
2086 if (rpcm_file)
2087 *rpcm_file = pcm_file;
2088 return 0;
2089}
2090
2091static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2092{
2093 struct snd_pcm *pcm;
2094 int err = nonseekable_open(inode, file);
2095 if (err < 0)
2096 return err;
2097 pcm = snd_lookup_minor_data(iminor(inode),
2098 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2099 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2100}
2101
2102static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2103{
2104 struct snd_pcm *pcm;
2105 int err = nonseekable_open(inode, file);
2106 if (err < 0)
2107 return err;
2108 pcm = snd_lookup_minor_data(iminor(inode),
2109 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2110 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2111}
2112
2113static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2114{
2115 int err;
2116 struct snd_pcm_file *pcm_file;
2117 wait_queue_t wait;
2118
2119 if (pcm == NULL) {
2120 err = -ENODEV;
2121 goto __error1;
2122 }
2123 err = snd_card_file_add(pcm->card, file);
2124 if (err < 0)
2125 goto __error1;
2126 if (!try_module_get(pcm->card->module)) {
2127 err = -EFAULT;
2128 goto __error2;
2129 }
2130 init_waitqueue_entry(&wait, current);
2131 add_wait_queue(&pcm->open_wait, &wait);
2132 mutex_lock(&pcm->open_mutex);
2133 while (1) {
2134 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2135 if (err >= 0)
2136 break;
2137 if (err == -EAGAIN) {
2138 if (file->f_flags & O_NONBLOCK) {
2139 err = -EBUSY;
2140 break;
2141 }
2142 } else
2143 break;
2144 set_current_state(TASK_INTERRUPTIBLE);
2145 mutex_unlock(&pcm->open_mutex);
2146 schedule();
2147 mutex_lock(&pcm->open_mutex);
2148 if (signal_pending(current)) {
2149 err = -ERESTARTSYS;
2150 break;
2151 }
2152 }
2153 remove_wait_queue(&pcm->open_wait, &wait);
2154 mutex_unlock(&pcm->open_mutex);
2155 if (err < 0)
2156 goto __error;
2157 return err;
2158
2159 __error:
2160 module_put(pcm->card->module);
2161 __error2:
2162 snd_card_file_remove(pcm->card, file);
2163 __error1:
2164 return err;
2165}
2166
2167static int snd_pcm_release(struct inode *inode, struct file *file)
2168{
2169 struct snd_pcm *pcm;
2170 struct snd_pcm_substream *substream;
2171 struct snd_pcm_file *pcm_file;
2172
2173 pcm_file = file->private_data;
2174 substream = pcm_file->substream;
2175 if (snd_BUG_ON(!substream))
2176 return -ENXIO;
2177 pcm = substream->pcm;
2178 mutex_lock(&pcm->open_mutex);
2179 snd_pcm_release_substream(substream);
2180 kfree(pcm_file);
2181 mutex_unlock(&pcm->open_mutex);
2182 wake_up(&pcm->open_wait);
2183 module_put(pcm->card->module);
2184 snd_card_file_remove(pcm->card, file);
2185 return 0;
2186}
2187
2188static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2189 snd_pcm_uframes_t frames)
2190{
2191 struct snd_pcm_runtime *runtime = substream->runtime;
2192 snd_pcm_sframes_t appl_ptr;
2193 snd_pcm_sframes_t ret;
2194 snd_pcm_sframes_t hw_avail;
2195
2196 if (frames == 0)
2197 return 0;
2198
2199 snd_pcm_stream_lock_irq(substream);
2200 switch (runtime->status->state) {
2201 case SNDRV_PCM_STATE_PREPARED:
2202 break;
2203 case SNDRV_PCM_STATE_DRAINING:
2204 case SNDRV_PCM_STATE_RUNNING:
2205 if (snd_pcm_update_hw_ptr(substream) >= 0)
2206 break;
2207 /* Fall through */
2208 case SNDRV_PCM_STATE_XRUN:
2209 ret = -EPIPE;
2210 goto __end;
2211 case SNDRV_PCM_STATE_SUSPENDED:
2212 ret = -ESTRPIPE;
2213 goto __end;
2214 default:
2215 ret = -EBADFD;
2216 goto __end;
2217 }
2218
2219 hw_avail = snd_pcm_playback_hw_avail(runtime);
2220 if (hw_avail <= 0) {
2221 ret = 0;
2222 goto __end;
2223 }
2224 if (frames > (snd_pcm_uframes_t)hw_avail)
2225 frames = hw_avail;
2226 appl_ptr = runtime->control->appl_ptr - frames;
2227 if (appl_ptr < 0)
2228 appl_ptr += runtime->boundary;
2229 runtime->control->appl_ptr = appl_ptr;
2230 ret = frames;
2231 __end:
2232 snd_pcm_stream_unlock_irq(substream);
2233 return ret;
2234}
2235
2236static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2237 snd_pcm_uframes_t frames)
2238{
2239 struct snd_pcm_runtime *runtime = substream->runtime;
2240 snd_pcm_sframes_t appl_ptr;
2241 snd_pcm_sframes_t ret;
2242 snd_pcm_sframes_t hw_avail;
2243
2244 if (frames == 0)
2245 return 0;
2246
2247 snd_pcm_stream_lock_irq(substream);
2248 switch (runtime->status->state) {
2249 case SNDRV_PCM_STATE_PREPARED:
2250 case SNDRV_PCM_STATE_DRAINING:
2251 break;
2252 case SNDRV_PCM_STATE_RUNNING:
2253 if (snd_pcm_update_hw_ptr(substream) >= 0)
2254 break;
2255 /* Fall through */
2256 case SNDRV_PCM_STATE_XRUN:
2257 ret = -EPIPE;
2258 goto __end;
2259 case SNDRV_PCM_STATE_SUSPENDED:
2260 ret = -ESTRPIPE;
2261 goto __end;
2262 default:
2263 ret = -EBADFD;
2264 goto __end;
2265 }
2266
2267 hw_avail = snd_pcm_capture_hw_avail(runtime);
2268 if (hw_avail <= 0) {
2269 ret = 0;
2270 goto __end;
2271 }
2272 if (frames > (snd_pcm_uframes_t)hw_avail)
2273 frames = hw_avail;
2274 appl_ptr = runtime->control->appl_ptr - frames;
2275 if (appl_ptr < 0)
2276 appl_ptr += runtime->boundary;
2277 runtime->control->appl_ptr = appl_ptr;
2278 ret = frames;
2279 __end:
2280 snd_pcm_stream_unlock_irq(substream);
2281 return ret;
2282}
2283
2284static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2285 snd_pcm_uframes_t frames)
2286{
2287 struct snd_pcm_runtime *runtime = substream->runtime;
2288 snd_pcm_sframes_t appl_ptr;
2289 snd_pcm_sframes_t ret;
2290 snd_pcm_sframes_t avail;
2291
2292 if (frames == 0)
2293 return 0;
2294
2295 snd_pcm_stream_lock_irq(substream);
2296 switch (runtime->status->state) {
2297 case SNDRV_PCM_STATE_PREPARED:
2298 case SNDRV_PCM_STATE_PAUSED:
2299 break;
2300 case SNDRV_PCM_STATE_DRAINING:
2301 case SNDRV_PCM_STATE_RUNNING:
2302 if (snd_pcm_update_hw_ptr(substream) >= 0)
2303 break;
2304 /* Fall through */
2305 case SNDRV_PCM_STATE_XRUN:
2306 ret = -EPIPE;
2307 goto __end;
2308 case SNDRV_PCM_STATE_SUSPENDED:
2309 ret = -ESTRPIPE;
2310 goto __end;
2311 default:
2312 ret = -EBADFD;
2313 goto __end;
2314 }
2315
2316 avail = snd_pcm_playback_avail(runtime);
2317 if (avail <= 0) {
2318 ret = 0;
2319 goto __end;
2320 }
2321 if (frames > (snd_pcm_uframes_t)avail)
2322 frames = avail;
2323 appl_ptr = runtime->control->appl_ptr + frames;
2324 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2325 appl_ptr -= runtime->boundary;
2326 runtime->control->appl_ptr = appl_ptr;
2327 ret = frames;
2328 __end:
2329 snd_pcm_stream_unlock_irq(substream);
2330 return ret;
2331}
2332
2333static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2334 snd_pcm_uframes_t frames)
2335{
2336 struct snd_pcm_runtime *runtime = substream->runtime;
2337 snd_pcm_sframes_t appl_ptr;
2338 snd_pcm_sframes_t ret;
2339 snd_pcm_sframes_t avail;
2340
2341 if (frames == 0)
2342 return 0;
2343
2344 snd_pcm_stream_lock_irq(substream);
2345 switch (runtime->status->state) {
2346 case SNDRV_PCM_STATE_PREPARED:
2347 case SNDRV_PCM_STATE_DRAINING:
2348 case SNDRV_PCM_STATE_PAUSED:
2349 break;
2350 case SNDRV_PCM_STATE_RUNNING:
2351 if (snd_pcm_update_hw_ptr(substream) >= 0)
2352 break;
2353 /* Fall through */
2354 case SNDRV_PCM_STATE_XRUN:
2355 ret = -EPIPE;
2356 goto __end;
2357 case SNDRV_PCM_STATE_SUSPENDED:
2358 ret = -ESTRPIPE;
2359 goto __end;
2360 default:
2361 ret = -EBADFD;
2362 goto __end;
2363 }
2364
2365 avail = snd_pcm_capture_avail(runtime);
2366 if (avail <= 0) {
2367 ret = 0;
2368 goto __end;
2369 }
2370 if (frames > (snd_pcm_uframes_t)avail)
2371 frames = avail;
2372 appl_ptr = runtime->control->appl_ptr + frames;
2373 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2374 appl_ptr -= runtime->boundary;
2375 runtime->control->appl_ptr = appl_ptr;
2376 ret = frames;
2377 __end:
2378 snd_pcm_stream_unlock_irq(substream);
2379 return ret;
2380}
2381
2382static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2383{
2384 struct snd_pcm_runtime *runtime = substream->runtime;
2385 int err;
2386
2387 snd_pcm_stream_lock_irq(substream);
2388 switch (runtime->status->state) {
2389 case SNDRV_PCM_STATE_DRAINING:
2390 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2391 goto __badfd;
2392 case SNDRV_PCM_STATE_RUNNING:
2393 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2394 break;
2395 /* Fall through */
2396 case SNDRV_PCM_STATE_PREPARED:
2397 case SNDRV_PCM_STATE_SUSPENDED:
2398 err = 0;
2399 break;
2400 case SNDRV_PCM_STATE_XRUN:
2401 err = -EPIPE;
2402 break;
2403 default:
2404 __badfd:
2405 err = -EBADFD;
2406 break;
2407 }
2408 snd_pcm_stream_unlock_irq(substream);
2409 return err;
2410}
2411
2412static int snd_pcm_delay(struct snd_pcm_substream *substream,
2413 snd_pcm_sframes_t __user *res)
2414{
2415 struct snd_pcm_runtime *runtime = substream->runtime;
2416 int err;
2417 snd_pcm_sframes_t n = 0;
2418
2419 snd_pcm_stream_lock_irq(substream);
2420 switch (runtime->status->state) {
2421 case SNDRV_PCM_STATE_DRAINING:
2422 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2423 goto __badfd;
2424 case SNDRV_PCM_STATE_RUNNING:
2425 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2426 break;
2427 /* Fall through */
2428 case SNDRV_PCM_STATE_PREPARED:
2429 case SNDRV_PCM_STATE_SUSPENDED:
2430 err = 0;
2431 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2432 n = snd_pcm_playback_hw_avail(runtime);
2433 else
2434 n = snd_pcm_capture_avail(runtime);
2435 n += runtime->delay;
2436 break;
2437 case SNDRV_PCM_STATE_XRUN:
2438 err = -EPIPE;
2439 break;
2440 default:
2441 __badfd:
2442 err = -EBADFD;
2443 break;
2444 }
2445 snd_pcm_stream_unlock_irq(substream);
2446 if (!err)
2447 if (put_user(n, res))
2448 err = -EFAULT;
2449 return err;
2450}
2451
2452static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2453 struct snd_pcm_sync_ptr __user *_sync_ptr)
2454{
2455 struct snd_pcm_runtime *runtime = substream->runtime;
2456 struct snd_pcm_sync_ptr sync_ptr;
2457 volatile struct snd_pcm_mmap_status *status;
2458 volatile struct snd_pcm_mmap_control *control;
2459 int err;
2460
2461 memset(&sync_ptr, 0, sizeof(sync_ptr));
2462 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2463 return -EFAULT;
2464 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2465 return -EFAULT;
2466 status = runtime->status;
2467 control = runtime->control;
2468 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2469 err = snd_pcm_hwsync(substream);
2470 if (err < 0)
2471 return err;
2472 }
2473 snd_pcm_stream_lock_irq(substream);
2474 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2475 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2476 else
2477 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2478 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2479 control->avail_min = sync_ptr.c.control.avail_min;
2480 else
2481 sync_ptr.c.control.avail_min = control->avail_min;
2482 sync_ptr.s.status.state = status->state;
2483 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2484 sync_ptr.s.status.tstamp = status->tstamp;
2485 sync_ptr.s.status.suspended_state = status->suspended_state;
2486 snd_pcm_stream_unlock_irq(substream);
2487 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2488 return -EFAULT;
2489 return 0;
2490}
2491
2492static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2493{
2494 struct snd_pcm_runtime *runtime = substream->runtime;
2495 int arg;
2496
2497 if (get_user(arg, _arg))
2498 return -EFAULT;
2499 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2500 return -EINVAL;
2501 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2502 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2503 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2504 return 0;
2505}
2506
2507static int snd_pcm_common_ioctl1(struct file *file,
2508 struct snd_pcm_substream *substream,
2509 unsigned int cmd, void __user *arg)
2510{
2511 switch (cmd) {
2512 case SNDRV_PCM_IOCTL_PVERSION:
2513 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2514 case SNDRV_PCM_IOCTL_INFO:
2515 return snd_pcm_info_user(substream, arg);
2516 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2517 return 0;
2518 case SNDRV_PCM_IOCTL_TTSTAMP:
2519 return snd_pcm_tstamp(substream, arg);
2520 case SNDRV_PCM_IOCTL_HW_REFINE:
2521 return snd_pcm_hw_refine_user(substream, arg);
2522 case SNDRV_PCM_IOCTL_HW_PARAMS:
2523 return snd_pcm_hw_params_user(substream, arg);
2524 case SNDRV_PCM_IOCTL_HW_FREE:
2525 return snd_pcm_hw_free(substream);
2526 case SNDRV_PCM_IOCTL_SW_PARAMS:
2527 return snd_pcm_sw_params_user(substream, arg);
2528 case SNDRV_PCM_IOCTL_STATUS:
2529 return snd_pcm_status_user(substream, arg);
2530 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2531 return snd_pcm_channel_info_user(substream, arg);
2532 case SNDRV_PCM_IOCTL_PREPARE:
2533 return snd_pcm_prepare(substream, file);
2534 case SNDRV_PCM_IOCTL_RESET:
2535 return snd_pcm_reset(substream);
2536 case SNDRV_PCM_IOCTL_START:
2537 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2538 case SNDRV_PCM_IOCTL_LINK:
2539 return snd_pcm_link(substream, (int)(unsigned long) arg);
2540 case SNDRV_PCM_IOCTL_UNLINK:
2541 return snd_pcm_unlink(substream);
2542 case SNDRV_PCM_IOCTL_RESUME:
2543 return snd_pcm_resume(substream);
2544 case SNDRV_PCM_IOCTL_XRUN:
2545 return snd_pcm_xrun(substream);
2546 case SNDRV_PCM_IOCTL_HWSYNC:
2547 return snd_pcm_hwsync(substream);
2548 case SNDRV_PCM_IOCTL_DELAY:
2549 return snd_pcm_delay(substream, arg);
2550 case SNDRV_PCM_IOCTL_SYNC_PTR:
2551 return snd_pcm_sync_ptr(substream, arg);
2552#ifdef CONFIG_SND_SUPPORT_OLD_API
2553 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2554 return snd_pcm_hw_refine_old_user(substream, arg);
2555 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2556 return snd_pcm_hw_params_old_user(substream, arg);
2557#endif
2558 case SNDRV_PCM_IOCTL_DRAIN:
2559 return snd_pcm_drain(substream, file);
2560 case SNDRV_PCM_IOCTL_DROP:
2561 return snd_pcm_drop(substream);
2562 case SNDRV_PCM_IOCTL_PAUSE:
2563 {
2564 int res;
2565 snd_pcm_stream_lock_irq(substream);
2566 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2567 snd_pcm_stream_unlock_irq(substream);
2568 return res;
2569 }
2570 }
2571 snd_printd("unknown ioctl = 0x%x\n", cmd);
2572 return -ENOTTY;
2573}
2574
2575static int snd_pcm_playback_ioctl1(struct file *file,
2576 struct snd_pcm_substream *substream,
2577 unsigned int cmd, void __user *arg)
2578{
2579 if (snd_BUG_ON(!substream))
2580 return -ENXIO;
2581 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2582 return -EINVAL;
2583 switch (cmd) {
2584 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2585 {
2586 struct snd_xferi xferi;
2587 struct snd_xferi __user *_xferi = arg;
2588 struct snd_pcm_runtime *runtime = substream->runtime;
2589 snd_pcm_sframes_t result;
2590 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2591 return -EBADFD;
2592 if (put_user(0, &_xferi->result))
2593 return -EFAULT;
2594 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2595 return -EFAULT;
2596 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2597 __put_user(result, &_xferi->result);
2598 return result < 0 ? result : 0;
2599 }
2600 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2601 {
2602 struct snd_xfern xfern;
2603 struct snd_xfern __user *_xfern = arg;
2604 struct snd_pcm_runtime *runtime = substream->runtime;
2605 void __user **bufs;
2606 snd_pcm_sframes_t result;
2607 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2608 return -EBADFD;
2609 if (runtime->channels > 128)
2610 return -EINVAL;
2611 if (put_user(0, &_xfern->result))
2612 return -EFAULT;
2613 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2614 return -EFAULT;
2615
2616 bufs = memdup_user(xfern.bufs,
2617 sizeof(void *) * runtime->channels);
2618 if (IS_ERR(bufs))
2619 return PTR_ERR(bufs);
2620 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2621 kfree(bufs);
2622 __put_user(result, &_xfern->result);
2623 return result < 0 ? result : 0;
2624 }
2625 case SNDRV_PCM_IOCTL_REWIND:
2626 {
2627 snd_pcm_uframes_t frames;
2628 snd_pcm_uframes_t __user *_frames = arg;
2629 snd_pcm_sframes_t result;
2630 if (get_user(frames, _frames))
2631 return -EFAULT;
2632 if (put_user(0, _frames))
2633 return -EFAULT;
2634 result = snd_pcm_playback_rewind(substream, frames);
2635 __put_user(result, _frames);
2636 return result < 0 ? result : 0;
2637 }
2638 case SNDRV_PCM_IOCTL_FORWARD:
2639 {
2640 snd_pcm_uframes_t frames;
2641 snd_pcm_uframes_t __user *_frames = arg;
2642 snd_pcm_sframes_t result;
2643 if (get_user(frames, _frames))
2644 return -EFAULT;
2645 if (put_user(0, _frames))
2646 return -EFAULT;
2647 result = snd_pcm_playback_forward(substream, frames);
2648 __put_user(result, _frames);
2649 return result < 0 ? result : 0;
2650 }
2651 }
2652 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2653}
2654
2655static int snd_pcm_capture_ioctl1(struct file *file,
2656 struct snd_pcm_substream *substream,
2657 unsigned int cmd, void __user *arg)
2658{
2659 if (snd_BUG_ON(!substream))
2660 return -ENXIO;
2661 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2662 return -EINVAL;
2663 switch (cmd) {
2664 case SNDRV_PCM_IOCTL_READI_FRAMES:
2665 {
2666 struct snd_xferi xferi;
2667 struct snd_xferi __user *_xferi = arg;
2668 struct snd_pcm_runtime *runtime = substream->runtime;
2669 snd_pcm_sframes_t result;
2670 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2671 return -EBADFD;
2672 if (put_user(0, &_xferi->result))
2673 return -EFAULT;
2674 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2675 return -EFAULT;
2676 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2677 __put_user(result, &_xferi->result);
2678 return result < 0 ? result : 0;
2679 }
2680 case SNDRV_PCM_IOCTL_READN_FRAMES:
2681 {
2682 struct snd_xfern xfern;
2683 struct snd_xfern __user *_xfern = arg;
2684 struct snd_pcm_runtime *runtime = substream->runtime;
2685 void *bufs;
2686 snd_pcm_sframes_t result;
2687 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2688 return -EBADFD;
2689 if (runtime->channels > 128)
2690 return -EINVAL;
2691 if (put_user(0, &_xfern->result))
2692 return -EFAULT;
2693 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2694 return -EFAULT;
2695
2696 bufs = memdup_user(xfern.bufs,
2697 sizeof(void *) * runtime->channels);
2698 if (IS_ERR(bufs))
2699 return PTR_ERR(bufs);
2700 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2701 kfree(bufs);
2702 __put_user(result, &_xfern->result);
2703 return result < 0 ? result : 0;
2704 }
2705 case SNDRV_PCM_IOCTL_REWIND:
2706 {
2707 snd_pcm_uframes_t frames;
2708 snd_pcm_uframes_t __user *_frames = arg;
2709 snd_pcm_sframes_t result;
2710 if (get_user(frames, _frames))
2711 return -EFAULT;
2712 if (put_user(0, _frames))
2713 return -EFAULT;
2714 result = snd_pcm_capture_rewind(substream, frames);
2715 __put_user(result, _frames);
2716 return result < 0 ? result : 0;
2717 }
2718 case SNDRV_PCM_IOCTL_FORWARD:
2719 {
2720 snd_pcm_uframes_t frames;
2721 snd_pcm_uframes_t __user *_frames = arg;
2722 snd_pcm_sframes_t result;
2723 if (get_user(frames, _frames))
2724 return -EFAULT;
2725 if (put_user(0, _frames))
2726 return -EFAULT;
2727 result = snd_pcm_capture_forward(substream, frames);
2728 __put_user(result, _frames);
2729 return result < 0 ? result : 0;
2730 }
2731 }
2732 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2733}
2734
2735static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2736 unsigned long arg)
2737{
2738 struct snd_pcm_file *pcm_file;
2739
2740 pcm_file = file->private_data;
2741
2742 if (((cmd >> 8) & 0xff) != 'A')
2743 return -ENOTTY;
2744
2745 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2746 (void __user *)arg);
2747}
2748
2749static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2750 unsigned long arg)
2751{
2752 struct snd_pcm_file *pcm_file;
2753
2754 pcm_file = file->private_data;
2755
2756 if (((cmd >> 8) & 0xff) != 'A')
2757 return -ENOTTY;
2758
2759 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2760 (void __user *)arg);
2761}
2762
2763int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2764 unsigned int cmd, void *arg)
2765{
2766 mm_segment_t fs;
2767 int result;
2768
2769 fs = snd_enter_user();
2770 switch (substream->stream) {
2771 case SNDRV_PCM_STREAM_PLAYBACK:
2772 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2773 (void __user *)arg);
2774 break;
2775 case SNDRV_PCM_STREAM_CAPTURE:
2776 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2777 (void __user *)arg);
2778 break;
2779 default:
2780 result = -EINVAL;
2781 break;
2782 }
2783 snd_leave_user(fs);
2784 return result;
2785}
2786
2787EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2788
2789static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2790 loff_t * offset)
2791{
2792 struct snd_pcm_file *pcm_file;
2793 struct snd_pcm_substream *substream;
2794 struct snd_pcm_runtime *runtime;
2795 snd_pcm_sframes_t result;
2796
2797 pcm_file = file->private_data;
2798 substream = pcm_file->substream;
2799 if (PCM_RUNTIME_CHECK(substream))
2800 return -ENXIO;
2801 runtime = substream->runtime;
2802 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2803 return -EBADFD;
2804 if (!frame_aligned(runtime, count))
2805 return -EINVAL;
2806 count = bytes_to_frames(runtime, count);
2807 result = snd_pcm_lib_read(substream, buf, count);
2808 if (result > 0)
2809 result = frames_to_bytes(runtime, result);
2810 return result;
2811}
2812
2813static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2814 size_t count, loff_t * offset)
2815{
2816 struct snd_pcm_file *pcm_file;
2817 struct snd_pcm_substream *substream;
2818 struct snd_pcm_runtime *runtime;
2819 snd_pcm_sframes_t result;
2820
2821 pcm_file = file->private_data;
2822 substream = pcm_file->substream;
2823 if (PCM_RUNTIME_CHECK(substream))
2824 return -ENXIO;
2825 runtime = substream->runtime;
2826 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2827 return -EBADFD;
2828 if (!frame_aligned(runtime, count))
2829 return -EINVAL;
2830 count = bytes_to_frames(runtime, count);
2831 result = snd_pcm_lib_write(substream, buf, count);
2832 if (result > 0)
2833 result = frames_to_bytes(runtime, result);
2834 return result;
2835}
2836
2837static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2838 unsigned long nr_segs, loff_t pos)
2839
2840{
2841 struct snd_pcm_file *pcm_file;
2842 struct snd_pcm_substream *substream;
2843 struct snd_pcm_runtime *runtime;
2844 snd_pcm_sframes_t result;
2845 unsigned long i;
2846 void __user **bufs;
2847 snd_pcm_uframes_t frames;
2848
2849 pcm_file = iocb->ki_filp->private_data;
2850 substream = pcm_file->substream;
2851 if (PCM_RUNTIME_CHECK(substream))
2852 return -ENXIO;
2853 runtime = substream->runtime;
2854 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2855 return -EBADFD;
2856 if (nr_segs > 1024 || nr_segs != runtime->channels)
2857 return -EINVAL;
2858 if (!frame_aligned(runtime, iov->iov_len))
2859 return -EINVAL;
2860 frames = bytes_to_samples(runtime, iov->iov_len);
2861 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2862 if (bufs == NULL)
2863 return -ENOMEM;
2864 for (i = 0; i < nr_segs; ++i)
2865 bufs[i] = iov[i].iov_base;
2866 result = snd_pcm_lib_readv(substream, bufs, frames);
2867 if (result > 0)
2868 result = frames_to_bytes(runtime, result);
2869 kfree(bufs);
2870 return result;
2871}
2872
2873static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2874 unsigned long nr_segs, loff_t pos)
2875{
2876 struct snd_pcm_file *pcm_file;
2877 struct snd_pcm_substream *substream;
2878 struct snd_pcm_runtime *runtime;
2879 snd_pcm_sframes_t result;
2880 unsigned long i;
2881 void __user **bufs;
2882 snd_pcm_uframes_t frames;
2883
2884 pcm_file = iocb->ki_filp->private_data;
2885 substream = pcm_file->substream;
2886 if (PCM_RUNTIME_CHECK(substream))
2887 return -ENXIO;
2888 runtime = substream->runtime;
2889 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2890 return -EBADFD;
2891 if (nr_segs > 128 || nr_segs != runtime->channels ||
2892 !frame_aligned(runtime, iov->iov_len))
2893 return -EINVAL;
2894 frames = bytes_to_samples(runtime, iov->iov_len);
2895 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2896 if (bufs == NULL)
2897 return -ENOMEM;
2898 for (i = 0; i < nr_segs; ++i)
2899 bufs[i] = iov[i].iov_base;
2900 result = snd_pcm_lib_writev(substream, bufs, frames);
2901 if (result > 0)
2902 result = frames_to_bytes(runtime, result);
2903 kfree(bufs);
2904 return result;
2905}
2906
2907static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2908{
2909 struct snd_pcm_file *pcm_file;
2910 struct snd_pcm_substream *substream;
2911 struct snd_pcm_runtime *runtime;
2912 unsigned int mask;
2913 snd_pcm_uframes_t avail;
2914
2915 pcm_file = file->private_data;
2916
2917 substream = pcm_file->substream;
2918 if (PCM_RUNTIME_CHECK(substream))
2919 return -ENXIO;
2920 runtime = substream->runtime;
2921
2922 poll_wait(file, &runtime->sleep, wait);
2923
2924 snd_pcm_stream_lock_irq(substream);
2925 avail = snd_pcm_playback_avail(runtime);
2926 switch (runtime->status->state) {
2927 case SNDRV_PCM_STATE_RUNNING:
2928 case SNDRV_PCM_STATE_PREPARED:
2929 case SNDRV_PCM_STATE_PAUSED:
2930 if (avail >= runtime->control->avail_min) {
2931 mask = POLLOUT | POLLWRNORM;
2932 break;
2933 }
2934 /* Fall through */
2935 case SNDRV_PCM_STATE_DRAINING:
2936 mask = 0;
2937 break;
2938 default:
2939 mask = POLLOUT | POLLWRNORM | POLLERR;
2940 break;
2941 }
2942 snd_pcm_stream_unlock_irq(substream);
2943 return mask;
2944}
2945
2946static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2947{
2948 struct snd_pcm_file *pcm_file;
2949 struct snd_pcm_substream *substream;
2950 struct snd_pcm_runtime *runtime;
2951 unsigned int mask;
2952 snd_pcm_uframes_t avail;
2953
2954 pcm_file = file->private_data;
2955
2956 substream = pcm_file->substream;
2957 if (PCM_RUNTIME_CHECK(substream))
2958 return -ENXIO;
2959 runtime = substream->runtime;
2960
2961 poll_wait(file, &runtime->sleep, wait);
2962
2963 snd_pcm_stream_lock_irq(substream);
2964 avail = snd_pcm_capture_avail(runtime);
2965 switch (runtime->status->state) {
2966 case SNDRV_PCM_STATE_RUNNING:
2967 case SNDRV_PCM_STATE_PREPARED:
2968 case SNDRV_PCM_STATE_PAUSED:
2969 if (avail >= runtime->control->avail_min) {
2970 mask = POLLIN | POLLRDNORM;
2971 break;
2972 }
2973 mask = 0;
2974 break;
2975 case SNDRV_PCM_STATE_DRAINING:
2976 if (avail > 0) {
2977 mask = POLLIN | POLLRDNORM;
2978 break;
2979 }
2980 /* Fall through */
2981 default:
2982 mask = POLLIN | POLLRDNORM | POLLERR;
2983 break;
2984 }
2985 snd_pcm_stream_unlock_irq(substream);
2986 return mask;
2987}
2988
2989/*
2990 * mmap support
2991 */
2992
2993/*
2994 * Only on coherent architectures, we can mmap the status and the control records
2995 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2996 */
2997#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2998/*
2999 * mmap status record
3000 */
3001static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3002 struct vm_fault *vmf)
3003{
3004 struct snd_pcm_substream *substream = area->vm_private_data;
3005 struct snd_pcm_runtime *runtime;
3006
3007 if (substream == NULL)
3008 return VM_FAULT_SIGBUS;
3009 runtime = substream->runtime;
3010 vmf->page = virt_to_page(runtime->status);
3011 get_page(vmf->page);
3012 return 0;
3013}
3014
3015static const struct vm_operations_struct snd_pcm_vm_ops_status =
3016{
3017 .fault = snd_pcm_mmap_status_fault,
3018};
3019
3020static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3021 struct vm_area_struct *area)
3022{
3023 long size;
3024 if (!(area->vm_flags & VM_READ))
3025 return -EINVAL;
3026 size = area->vm_end - area->vm_start;
3027 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3028 return -EINVAL;
3029 area->vm_ops = &snd_pcm_vm_ops_status;
3030 area->vm_private_data = substream;
3031 area->vm_flags |= VM_RESERVED;
3032 return 0;
3033}
3034
3035/*
3036 * mmap control record
3037 */
3038static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3039 struct vm_fault *vmf)
3040{
3041 struct snd_pcm_substream *substream = area->vm_private_data;
3042 struct snd_pcm_runtime *runtime;
3043
3044 if (substream == NULL)
3045 return VM_FAULT_SIGBUS;
3046 runtime = substream->runtime;
3047 vmf->page = virt_to_page(runtime->control);
3048 get_page(vmf->page);
3049 return 0;
3050}
3051
3052static const struct vm_operations_struct snd_pcm_vm_ops_control =
3053{
3054 .fault = snd_pcm_mmap_control_fault,
3055};
3056
3057static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3058 struct vm_area_struct *area)
3059{
3060 long size;
3061 if (!(area->vm_flags & VM_READ))
3062 return -EINVAL;
3063 size = area->vm_end - area->vm_start;
3064 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3065 return -EINVAL;
3066 area->vm_ops = &snd_pcm_vm_ops_control;
3067 area->vm_private_data = substream;
3068 area->vm_flags |= VM_RESERVED;
3069 return 0;
3070}
3071#else /* ! coherent mmap */
3072/*
3073 * don't support mmap for status and control records.
3074 */
3075static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3076 struct vm_area_struct *area)
3077{
3078 return -ENXIO;
3079}
3080static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3081 struct vm_area_struct *area)
3082{
3083 return -ENXIO;
3084}
3085#endif /* coherent mmap */
3086
3087static inline struct page *
3088snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3089{
3090 void *vaddr = substream->runtime->dma_area + ofs;
3091#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3092 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3093 return virt_to_page(CAC_ADDR(vaddr));
3094#endif
3095#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3096 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3097 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3098 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3099 /* assume dma_handle set via pfn_to_phys() in
3100 * mm/dma-noncoherent.c
3101 */
3102 return pfn_to_page(addr >> PAGE_SHIFT);
3103 }
3104#endif
3105 return virt_to_page(vaddr);
3106}
3107
3108/*
3109 * fault callback for mmapping a RAM page
3110 */
3111static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3112 struct vm_fault *vmf)
3113{
3114 struct snd_pcm_substream *substream = area->vm_private_data;
3115 struct snd_pcm_runtime *runtime;
3116 unsigned long offset;
3117 struct page * page;
3118 size_t dma_bytes;
3119
3120 if (substream == NULL)
3121 return VM_FAULT_SIGBUS;
3122 runtime = substream->runtime;
3123 offset = vmf->pgoff << PAGE_SHIFT;
3124 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3125 if (offset > dma_bytes - PAGE_SIZE)
3126 return VM_FAULT_SIGBUS;
3127 if (substream->ops->page)
3128 page = substream->ops->page(substream, offset);
3129 else
3130 page = snd_pcm_default_page_ops(substream, offset);
3131 if (!page)
3132 return VM_FAULT_SIGBUS;
3133 get_page(page);
3134 vmf->page = page;
3135 return 0;
3136}
3137
3138static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3139 .open = snd_pcm_mmap_data_open,
3140 .close = snd_pcm_mmap_data_close,
3141};
3142
3143static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3144 .open = snd_pcm_mmap_data_open,
3145 .close = snd_pcm_mmap_data_close,
3146 .fault = snd_pcm_mmap_data_fault,
3147};
3148
3149#ifndef ARCH_HAS_DMA_MMAP_COHERENT
3150/* This should be defined / handled globally! */
3151#ifdef CONFIG_ARM
3152#define ARCH_HAS_DMA_MMAP_COHERENT
3153#endif
3154#endif
3155
3156/*
3157 * mmap the DMA buffer on RAM
3158 */
3159static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3160 struct vm_area_struct *area)
3161{
3162 area->vm_flags |= VM_RESERVED;
3163#ifdef ARCH_HAS_DMA_MMAP_COHERENT
3164 if (!substream->ops->page &&
3165 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3166 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3167 area,
3168 substream->runtime->dma_area,
3169 substream->runtime->dma_addr,
3170 area->vm_end - area->vm_start);
3171#elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3172 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3173 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3174 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3175#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3176 /* mmap with fault handler */
3177 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3178 return 0;
3179}
3180
3181/*
3182 * mmap the DMA buffer on I/O memory area
3183 */
3184#if SNDRV_PCM_INFO_MMAP_IOMEM
3185int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3186 struct vm_area_struct *area)
3187{
3188 long size;
3189 unsigned long offset;
3190
3191 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3192 area->vm_flags |= VM_IO;
3193 size = area->vm_end - area->vm_start;
3194 offset = area->vm_pgoff << PAGE_SHIFT;
3195 if (io_remap_pfn_range(area, area->vm_start,
3196 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3197 size, area->vm_page_prot))
3198 return -EAGAIN;
3199 return 0;
3200}
3201
3202EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3203#endif /* SNDRV_PCM_INFO_MMAP */
3204
3205/*
3206 * mmap DMA buffer
3207 */
3208int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3209 struct vm_area_struct *area)
3210{
3211 struct snd_pcm_runtime *runtime;
3212 long size;
3213 unsigned long offset;
3214 size_t dma_bytes;
3215 int err;
3216
3217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3218 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3219 return -EINVAL;
3220 } else {
3221 if (!(area->vm_flags & VM_READ))
3222 return -EINVAL;
3223 }
3224 runtime = substream->runtime;
3225 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3226 return -EBADFD;
3227 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3228 return -ENXIO;
3229 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3230 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3231 return -EINVAL;
3232 size = area->vm_end - area->vm_start;
3233 offset = area->vm_pgoff << PAGE_SHIFT;
3234 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3235 if ((size_t)size > dma_bytes)
3236 return -EINVAL;
3237 if (offset > dma_bytes - size)
3238 return -EINVAL;
3239
3240 area->vm_ops = &snd_pcm_vm_ops_data;
3241 area->vm_private_data = substream;
3242 if (substream->ops->mmap)
3243 err = substream->ops->mmap(substream, area);
3244 else
3245 err = snd_pcm_default_mmap(substream, area);
3246 if (!err)
3247 atomic_inc(&substream->mmap_count);
3248 return err;
3249}
3250
3251EXPORT_SYMBOL(snd_pcm_mmap_data);
3252
3253static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3254{
3255 struct snd_pcm_file * pcm_file;
3256 struct snd_pcm_substream *substream;
3257 unsigned long offset;
3258
3259 pcm_file = file->private_data;
3260 substream = pcm_file->substream;
3261 if (PCM_RUNTIME_CHECK(substream))
3262 return -ENXIO;
3263
3264 offset = area->vm_pgoff << PAGE_SHIFT;
3265 switch (offset) {
3266 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3267 if (pcm_file->no_compat_mmap)
3268 return -ENXIO;
3269 return snd_pcm_mmap_status(substream, file, area);
3270 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3271 if (pcm_file->no_compat_mmap)
3272 return -ENXIO;
3273 return snd_pcm_mmap_control(substream, file, area);
3274 default:
3275 return snd_pcm_mmap_data(substream, file, area);
3276 }
3277 return 0;
3278}
3279
3280static int snd_pcm_fasync(int fd, struct file * file, int on)
3281{
3282 struct snd_pcm_file * pcm_file;
3283 struct snd_pcm_substream *substream;
3284 struct snd_pcm_runtime *runtime;
3285
3286 pcm_file = file->private_data;
3287 substream = pcm_file->substream;
3288 if (PCM_RUNTIME_CHECK(substream))
3289 return -ENXIO;
3290 runtime = substream->runtime;
3291 return fasync_helper(fd, file, on, &runtime->fasync);
3292}
3293
3294/*
3295 * ioctl32 compat
3296 */
3297#ifdef CONFIG_COMPAT
3298#include "pcm_compat.c"
3299#else
3300#define snd_pcm_ioctl_compat NULL
3301#endif
3302
3303/*
3304 * To be removed helpers to keep binary compatibility
3305 */
3306
3307#ifdef CONFIG_SND_SUPPORT_OLD_API
3308#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3309#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3310
3311static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3312 struct snd_pcm_hw_params_old *oparams)
3313{
3314 unsigned int i;
3315
3316 memset(params, 0, sizeof(*params));
3317 params->flags = oparams->flags;
3318 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3319 params->masks[i].bits[0] = oparams->masks[i];
3320 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3321 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3322 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3323 params->info = oparams->info;
3324 params->msbits = oparams->msbits;
3325 params->rate_num = oparams->rate_num;
3326 params->rate_den = oparams->rate_den;
3327 params->fifo_size = oparams->fifo_size;
3328}
3329
3330static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3331 struct snd_pcm_hw_params *params)
3332{
3333 unsigned int i;
3334
3335 memset(oparams, 0, sizeof(*oparams));
3336 oparams->flags = params->flags;
3337 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3338 oparams->masks[i] = params->masks[i].bits[0];
3339 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3340 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3341 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3342 oparams->info = params->info;
3343 oparams->msbits = params->msbits;
3344 oparams->rate_num = params->rate_num;
3345 oparams->rate_den = params->rate_den;
3346 oparams->fifo_size = params->fifo_size;
3347}
3348
3349static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3350 struct snd_pcm_hw_params_old __user * _oparams)
3351{
3352 struct snd_pcm_hw_params *params;
3353 struct snd_pcm_hw_params_old *oparams = NULL;
3354 int err;
3355
3356 params = kmalloc(sizeof(*params), GFP_KERNEL);
3357 if (!params)
3358 return -ENOMEM;
3359
3360 oparams = memdup_user(_oparams, sizeof(*oparams));
3361 if (IS_ERR(oparams)) {
3362 err = PTR_ERR(oparams);
3363 goto out;
3364 }
3365 snd_pcm_hw_convert_from_old_params(params, oparams);
3366 err = snd_pcm_hw_refine(substream, params);
3367 snd_pcm_hw_convert_to_old_params(oparams, params);
3368 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3369 if (!err)
3370 err = -EFAULT;
3371 }
3372
3373 kfree(oparams);
3374out:
3375 kfree(params);
3376 return err;
3377}
3378
3379static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3380 struct snd_pcm_hw_params_old __user * _oparams)
3381{
3382 struct snd_pcm_hw_params *params;
3383 struct snd_pcm_hw_params_old *oparams = NULL;
3384 int err;
3385
3386 params = kmalloc(sizeof(*params), GFP_KERNEL);
3387 if (!params)
3388 return -ENOMEM;
3389
3390 oparams = memdup_user(_oparams, sizeof(*oparams));
3391 if (IS_ERR(oparams)) {
3392 err = PTR_ERR(oparams);
3393 goto out;
3394 }
3395 snd_pcm_hw_convert_from_old_params(params, oparams);
3396 err = snd_pcm_hw_params(substream, params);
3397 snd_pcm_hw_convert_to_old_params(oparams, params);
3398 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3399 if (!err)
3400 err = -EFAULT;
3401 }
3402
3403 kfree(oparams);
3404out:
3405 kfree(params);
3406 return err;
3407}
3408#endif /* CONFIG_SND_SUPPORT_OLD_API */
3409
3410#ifndef CONFIG_MMU
3411static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3412 unsigned long addr,
3413 unsigned long len,
3414 unsigned long pgoff,
3415 unsigned long flags)
3416{
3417 struct snd_pcm_file *pcm_file = file->private_data;
3418 struct snd_pcm_substream *substream = pcm_file->substream;
3419 struct snd_pcm_runtime *runtime = substream->runtime;
3420 unsigned long offset = pgoff << PAGE_SHIFT;
3421
3422 switch (offset) {
3423 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3424 return (unsigned long)runtime->status;
3425 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3426 return (unsigned long)runtime->control;
3427 default:
3428 return (unsigned long)runtime->dma_area + offset;
3429 }
3430}
3431#else
3432# define snd_pcm_get_unmapped_area NULL
3433#endif
3434
3435/*
3436 * Register section
3437 */
3438
3439const struct file_operations snd_pcm_f_ops[2] = {
3440 {
3441 .owner = THIS_MODULE,
3442 .write = snd_pcm_write,
3443 .aio_write = snd_pcm_aio_write,
3444 .open = snd_pcm_playback_open,
3445 .release = snd_pcm_release,
3446 .llseek = no_llseek,
3447 .poll = snd_pcm_playback_poll,
3448 .unlocked_ioctl = snd_pcm_playback_ioctl,
3449 .compat_ioctl = snd_pcm_ioctl_compat,
3450 .mmap = snd_pcm_mmap,
3451 .fasync = snd_pcm_fasync,
3452 .get_unmapped_area = snd_pcm_get_unmapped_area,
3453 },
3454 {
3455 .owner = THIS_MODULE,
3456 .read = snd_pcm_read,
3457 .aio_read = snd_pcm_aio_read,
3458 .open = snd_pcm_capture_open,
3459 .release = snd_pcm_release,
3460 .llseek = no_llseek,
3461 .poll = snd_pcm_capture_poll,
3462 .unlocked_ioctl = snd_pcm_capture_ioctl,
3463 .compat_ioctl = snd_pcm_ioctl_compat,
3464 .mmap = snd_pcm_mmap,
3465 .fasync = snd_pcm_fasync,
3466 .get_unmapped_area = snd_pcm_get_unmapped_area,
3467 }
3468};