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ALSA: pcm: Add the support for sync-stop operation
[linux-2.6-block.git] / sound / core / pcm_native.c
CommitLineData
1a59d1b8 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * Digital Audio (PCM) abstract layer
c1017a4c 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 5 */
6
1da177e4 7#include <linux/mm.h>
da155d5b 8#include <linux/module.h>
1da177e4
LT		 9#include <linux/file.h>
10#include <linux/slab.h>
174cd4b1 11#include <linux/sched/signal.h>
1da177e4 12#include <linux/time.h>
e8db0be1 13#include <linux/pm_qos.h>
6cbbfe1c 14#include <linux/io.h>
657b1989 15#include <linux/dma-mapping.h>
7e8edae3 16#include <linux/vmalloc.h>
1da177e4
LT		 17#include <sound/core.h>
18#include <sound/control.h>
19#include <sound/info.h>
20#include <sound/pcm.h>
21#include <sound/pcm_params.h>
22#include <sound/timer.h>
23#include <sound/minors.h>
e2e40f2c 24#include <linux/uio.h>
b888a5f7 25#include <linux/delay.h>
1da177e4 26
2c4842d3
TS		 27#include "pcm_local.h"
28
37567c55 29#ifdef CONFIG_SND_DEBUG
be4e31da
TS		 30#define CREATE_TRACE_POINTS
31#include "pcm_param_trace.h"
37567c55
TS		 32#else
33#define trace_hw_mask_param_enabled() 0
34#define trace_hw_interval_param_enabled() 0
35#define trace_hw_mask_param(substream, type, index, prev, curr)
36#define trace_hw_interval_param(substream, type, index, prev, curr)
37#endif
be4e31da 38
1da177e4
LT		 39/*
40 * Compatibility
41 */
42
877211f5 43struct snd_pcm_hw_params_old {
1da177e4
LT		 44 unsigned int flags;
45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
46 SNDRV_PCM_HW_PARAM_ACCESS + 1];
877211f5 47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
1da177e4
LT		 48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
49 unsigned int rmask;
50 unsigned int cmask;
51 unsigned int info;
52 unsigned int msbits;
53 unsigned int rate_num;
54 unsigned int rate_den;
877211f5 55 snd_pcm_uframes_t fifo_size;
1da177e4
LT		 56 unsigned char reserved[64];
57};
58
59d48582 59#ifdef CONFIG_SND_SUPPORT_OLD_API
877211f5
TI		 60#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
61#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
1da177e4 62
877211f5
TI		 63static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params_old __user * _oparams);
65static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
59d48582 67#endif
f87135f5 68static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
1da177e4
LT		 69
70/*
71 *
72 */
73
7af142f7 74static DECLARE_RWSEM(snd_pcm_link_rwsem);
1da177e4 75
73365cb1 76void snd_pcm_group_init(struct snd_pcm_group *group)
67ec1072 77{
73365cb1
TI		 78 spin_lock_init(&group->lock);
79 mutex_init(&group->mutex);
80 INIT_LIST_HEAD(&group->substreams);
0e279dce 81 refcount_set(&group->refs, 1);
67ec1072
TI		 82}
83
f57f3df0
TI		 84/* define group lock helpers */
85#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
86static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
87{ \
88 if (nonatomic) \
89 mutex_ ## mutex_action(&group->mutex); \
90 else \
91 spin_ ## action(&group->lock); \
10aa7cad
AMG		 92}
93
f57f3df0
TI		 94DEFINE_PCM_GROUP_LOCK(lock, lock);
95DEFINE_PCM_GROUP_LOCK(unlock, unlock);
96DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
97DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
10aa7cad 98
30b771cf
TI		 99/**
100 * snd_pcm_stream_lock - Lock the PCM stream
101 * @substream: PCM substream
102 *
103 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
104 * flag of the given substream. This also takes the global link rw lock
105 * (or rw sem), too, for avoiding the race with linked streams.
106 */
7af142f7
TI		 107void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
108{
ef2056b8 109 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
7af142f7
TI		 110}
111EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
112
30b771cf
TI		 113/**
114 * snd_pcm_stream_lock - Unlock the PCM stream
115 * @substream: PCM substream
116 *
117 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
118 */
7af142f7
TI		 119void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
120{
ef2056b8 121 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
7af142f7
TI		 122}
123EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
124
30b771cf
TI		 125/**
126 * snd_pcm_stream_lock_irq - Lock the PCM stream
127 * @substream: PCM substream
128 *
129 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
130 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
131 * as snd_pcm_stream_lock().
132 */
7af142f7
TI		 133void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
134{
ef2056b8
TI		 135 snd_pcm_group_lock_irq(&substream->self_group,
136 substream->pcm->nonatomic);
7af142f7
TI		 137}
138EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
139
30b771cf
TI		 140/**
141 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
142 * @substream: PCM substream
143 *
144 * This is a counter-part of snd_pcm_stream_lock_irq().
145 */
7af142f7
TI		 146void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
147{
ef2056b8
TI		 148 snd_pcm_group_unlock_irq(&substream->self_group,
149 substream->pcm->nonatomic);
7af142f7
TI		 150}
151EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
152
153unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
154{
ef2056b8
TI		 155 unsigned long flags = 0;
156 if (substream->pcm->nonatomic)
157 mutex_lock(&substream->self_group.mutex);
158 else
159 spin_lock_irqsave(&substream->self_group.lock, flags);
160 return flags;
7af142f7
TI		 161}
162EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
163
30b771cf
TI		 164/**
165 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
166 * @substream: PCM substream
167 * @flags: irq flags
168 *
169 * This is a counter-part of snd_pcm_stream_lock_irqsave().
170 */
7af142f7
TI		 171void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
172 unsigned long flags)
173{
ef2056b8
TI		 174 if (substream->pcm->nonatomic)
175 mutex_unlock(&substream->self_group.mutex);
176 else
177 spin_unlock_irqrestore(&substream->self_group.lock, flags);
7af142f7
TI		 178}
179EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
1da177e4 180
fc033cbf
TI		 181/* Run PCM ioctl ops */
182static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
183 unsigned cmd, void *arg)
184{
185 if (substream->ops->ioctl)
186 return substream->ops->ioctl(substream, cmd, arg);
187 else
188 return snd_pcm_lib_ioctl(substream, cmd, arg);
189}
190
877211f5 191int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
1da177e4 192{
877211f5
TI		 193 struct snd_pcm *pcm = substream->pcm;
194 struct snd_pcm_str *pstr = substream->pstr;
1da177e4 195
1da177e4
LT		 196 memset(info, 0, sizeof(*info));
197 info->card = pcm->card->number;
198 info->device = pcm->device;
199 info->stream = substream->stream;
200 info->subdevice = substream->number;
201 strlcpy(info->id, pcm->id, sizeof(info->id));
202 strlcpy(info->name, pcm->name, sizeof(info->name));
203 info->dev_class = pcm->dev_class;
204 info->dev_subclass = pcm->dev_subclass;
205 info->subdevices_count = pstr->substream_count;
206 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
207 strlcpy(info->subname, substream->name, sizeof(info->subname));
e11f0f90 208
1da177e4
LT		 209 return 0;
210}
211
877211f5
TI		 212int snd_pcm_info_user(struct snd_pcm_substream *substream,
213 struct snd_pcm_info __user * _info)
1da177e4 214{
877211f5 215 struct snd_pcm_info *info;
1da177e4
LT		 216 int err;
217
218 info = kmalloc(sizeof(*info), GFP_KERNEL);
219 if (! info)
220 return -ENOMEM;
221 err = snd_pcm_info(substream, info);
222 if (err >= 0) {
223 if (copy_to_user(_info, info, sizeof(*info)))
224 err = -EFAULT;
225 }
226 kfree(info);
227 return err;
228}
229
63825f3a
TI		 230static bool hw_support_mmap(struct snd_pcm_substream *substream)
231{
232 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
233 return false;
425da159
CH		 234
235 if (substream->ops->mmap ||
6111fd23
TI		 236 (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV &&
237 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC))
425da159
CH		 238 return true;
239
240 return dma_can_mmap(substream->dma_buffer.dev.dev);
63825f3a
TI		 241}
242
561e1cad
TS		 243static int constrain_mask_params(struct snd_pcm_substream *substream,
244 struct snd_pcm_hw_params *params)
1da177e4 245{
561e1cad
TS		 246 struct snd_pcm_hw_constraints *constrs =
247 &substream->runtime->hw_constraints;
248 struct snd_mask *m;
1da177e4 249 unsigned int k;
561e1cad
TS		 250 struct snd_mask old_mask;
251 int changed;
1da177e4
LT		 252
253 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
254 m = hw_param_mask(params, k);
255 if (snd_mask_empty(m))
256 return -EINVAL;
d81052f9
TS		 257
258 /* This parameter is not requested to change by a caller. */
1da177e4
LT		 259 if (!(params->rmask & (1 << k)))
260 continue;
561e1cad
TS		 261
262 if (trace_hw_mask_param_enabled())
263 old_mask = *m;
264
1da177e4 265 changed = snd_mask_refine(m, constrs_mask(constrs, k));
1da177e4
LT		 266 if (changed < 0)
267 return changed;
82e7d501
TS		 268 if (changed == 0)
269 continue;
561e1cad 270
d81052f9 271 /* Set corresponding flag so that the caller gets it. */
82e7d501
TS		 272 trace_hw_mask_param(substream, k, 0, &old_mask, m);
273 params->cmask |= 1 << k;
1da177e4
LT		 274 }
275
561e1cad
TS		 276 return 0;
277}
278
3432fa04
TS		 279static int constrain_interval_params(struct snd_pcm_substream *substream,
280 struct snd_pcm_hw_params *params)
281{
282 struct snd_pcm_hw_constraints *constrs =
283 &substream->runtime->hw_constraints;
284 struct snd_interval *i;
285 unsigned int k;
286 struct snd_interval old_interval;
287 int changed;
288
1da177e4
LT		 289 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
290 i = hw_param_interval(params, k);
291 if (snd_interval_empty(i))
292 return -EINVAL;
d81052f9
TS		 293
294 /* This parameter is not requested to change by a caller. */
1da177e4
LT		 295 if (!(params->rmask & (1 << k)))
296 continue;
3432fa04
TS		 297
298 if (trace_hw_interval_param_enabled())
299 old_interval = *i;
300
1da177e4 301 changed = snd_interval_refine(i, constrs_interval(constrs, k));
1da177e4
LT		 302 if (changed < 0)
303 return changed;
82e7d501
TS		 304 if (changed == 0)
305 continue;
3432fa04 306
d81052f9 307 /* Set corresponding flag so that the caller gets it. */
82e7d501
TS		 308 trace_hw_interval_param(substream, k, 0, &old_interval, i);
309 params->cmask |= 1 << k;
1da177e4
LT		 310 }
311
3432fa04
TS		 312 return 0;
313}
314
9cc07f55
TS		 315static int constrain_params_by_rules(struct snd_pcm_substream *substream,
316 struct snd_pcm_hw_params *params)
1da177e4 317{
9cc07f55
TS		 318 struct snd_pcm_hw_constraints *constrs =
319 &substream->runtime->hw_constraints;
1da177e4 320 unsigned int k;
5730f9f7 321 unsigned int *rstamps;
1da177e4 322 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
d81052f9 323 unsigned int stamp;
a1c06e39
TS		 324 struct snd_pcm_hw_rule *r;
325 unsigned int d;
9cc07f55
TS		 326 struct snd_mask old_mask;
327 struct snd_interval old_interval;
a1c06e39 328 bool again;
5730f9f7 329 int changed, err = 0;
1da177e4 330
d81052f9
TS		 331 /*
332 * Each application of rule has own sequence number.
333 *
334 * Each member of 'rstamps' array represents the sequence number of
335 * recent application of corresponding rule.
336 */
5730f9f7
TI		 337 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
338 if (!rstamps)
339 return -ENOMEM;
d81052f9
TS		 340
341 /*
342 * Each member of 'vstamps' array represents the sequence number of
343 * recent application of rule in which corresponding parameters were
344 * changed.
345 *
346 * In initial state, elements corresponding to parameters requested by
347 * a caller is 1. For unrequested parameters, corresponding members
348 * have 0 so that the parameters are never changed anymore.
349 */
9cc07f55 350 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1da177e4 351 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
d81052f9
TS		 352
353 /* Due to the above design, actual sequence number starts at 2. */
354 stamp = 2;
0d4e3999 355retry:
d81052f9 356 /* Apply all rules in order. */
a1c06e39 357 again = false;
0d4e3999 358 for (k = 0; k < constrs->rules_num; k++) {
a1c06e39 359 r = &constrs->rules[k];
d81052f9
TS		 360
361 /*
362 * Check condition bits of this rule. When the rule has
363 * some condition bits, parameter without the bits is
364 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
365 * is an example of the condition bits.
366 */
0d4e3999
TS		 367 if (r->cond && !(r->cond & params->flags))
368 continue;
d81052f9
TS		 369
370 /*
371 * The 'deps' array includes maximum three dependencies
372 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
373 * member of this array is a sentinel and should be
374 * negative value.
375 *
376 * This rule should be processed in this time when dependent
377 * parameters were changed at former applications of the other
378 * rules.
379 */
0d4e3999 380 for (d = 0; r->deps[d] >= 0; d++) {
d656b4a6 381 if (vstamps[r->deps[d]] > rstamps[k])
0d4e3999 382 break;
0d4e3999 383 }
d656b4a6 384 if (r->deps[d] < 0)
0d4e3999 385 continue;
be4e31da 386
0d4e3999
TS		 387 if (trace_hw_mask_param_enabled()) {
388 if (hw_is_mask(r->var))
389 old_mask = *hw_param_mask(params, r->var);
390 }
391 if (trace_hw_interval_param_enabled()) {
392 if (hw_is_interval(r->var))
393 old_interval = *hw_param_interval(params, r->var);
394 }
c6706de0 395
0d4e3999 396 changed = r->func(params, r);
5730f9f7
TI		 397 if (changed < 0) {
398 err = changed;
399 goto out;
400 }
c6706de0 401
d81052f9 402 /*
82e7d501 403 * When the parameter is changed, notify it to the caller
d81052f9
TS		 404 * by corresponding returned bit, then preparing for next
405 * iteration.
406 */
0d4e3999 407 if (changed && r->var >= 0) {
82e7d501
TS		 408 if (hw_is_mask(r->var)) {
409 trace_hw_mask_param(substream, r->var,
410 k + 1, &old_mask,
411 hw_param_mask(params, r->var));
1da177e4 412 }
82e7d501
TS		 413 if (hw_is_interval(r->var)) {
414 trace_hw_interval_param(substream, r->var,
415 k + 1, &old_interval,
416 hw_param_interval(params, r->var));
1da177e4 417 }
82e7d501 418
0d4e3999
TS		 419 params->cmask |= (1 << r->var);
420 vstamps[r->var] = stamp;
a1c06e39 421 again = true;
1da177e4 422 }
f74ae15f 423
82e7d501 424 rstamps[k] = stamp++;
0d4e3999
TS		 425 }
426
d81052f9 427 /* Iterate to evaluate all rules till no parameters are changed. */
0d4e3999
TS		 428 if (again)
429 goto retry;
9cc07f55 430
5730f9f7
TI		 431 out:
432 kfree(rstamps);
433 return err;
9cc07f55
TS		 434}
435
f9a076bf
TS		 436static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
437 struct snd_pcm_hw_params *params)
438{
439 const struct snd_interval *i;
440 const struct snd_mask *m;
441 int err;
442
1da177e4 443 if (!params->msbits) {
f9a076bf 444 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1da177e4
LT		 445 if (snd_interval_single(i))
446 params->msbits = snd_interval_value(i);
447 }
448
449 if (!params->rate_den) {
f9a076bf 450 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
1da177e4
LT		 451 if (snd_interval_single(i)) {
452 params->rate_num = snd_interval_value(i);
453 params->rate_den = 1;
454 }
455 }
456
f9a076bf
TS		 457 if (!params->fifo_size) {
458 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
459 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
460 if (snd_mask_single(m) && snd_interval_single(i)) {
fc033cbf
TI		 461 err = snd_pcm_ops_ioctl(substream,
462 SNDRV_PCM_IOCTL1_FIFO_SIZE,
463 params);
f9a076bf
TS		 464 if (err < 0)
465 return err;
466 }
467 }
468
63825f3a 469 if (!params->info) {
7802fb52
TS		 470 params->info = substream->runtime->hw.info;
471 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
472 SNDRV_PCM_INFO_DRAIN_TRIGGER);
63825f3a
TI		 473 if (!hw_support_mmap(substream))
474 params->info &= ~(SNDRV_PCM_INFO_MMAP |
475 SNDRV_PCM_INFO_MMAP_VALID);
476 }
7802fb52 477
f9a076bf
TS		 478 return 0;
479}
480
9cc07f55
TS		 481int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params *params)
483{
9cc07f55
TS		 484 int err;
485
486 params->info = 0;
487 params->fifo_size = 0;
488 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
489 params->msbits = 0;
490 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
491 params->rate_num = 0;
492 params->rate_den = 0;
8bea869c 493 }
9cc07f55
TS		 494
495 err = constrain_mask_params(substream, params);
496 if (err < 0)
497 return err;
498
499 err = constrain_interval_params(substream, params);
500 if (err < 0)
501 return err;
502
503 err = constrain_params_by_rules(substream, params);
504 if (err < 0)
505 return err;
506
1da177e4 507 params->rmask = 0;
7802fb52 508
1da177e4
LT		 509 return 0;
510}
e88e8ae6
TI		 511EXPORT_SYMBOL(snd_pcm_hw_refine);
512
877211f5
TI		 513static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
514 struct snd_pcm_hw_params __user * _params)
1da177e4 515{
877211f5 516 struct snd_pcm_hw_params *params;
1da177e4
LT		 517 int err;
518
ef44a1ec
LZ		 519 params = memdup_user(_params, sizeof(*params));
520 if (IS_ERR(params))
521 return PTR_ERR(params);
522
1da177e4 523 err = snd_pcm_hw_refine(substream, params);
f74ae15f
TS		 524 if (err < 0)
525 goto end;
ef44a1ec 526
f74ae15f
TS		 527 err = fixup_unreferenced_params(substream, params);
528 if (err < 0)
529 goto end;
ef44a1ec 530
f74ae15f
TS		 531 if (copy_to_user(_params, params, sizeof(*params)))
532 err = -EFAULT;
533end:
1da177e4
LT		 534 kfree(params);
535 return err;
536}
537
9442e691
TI		 538static int period_to_usecs(struct snd_pcm_runtime *runtime)
539{
540 int usecs;
541
542 if (! runtime->rate)
543 return -1; /* invalid */
544
545 /* take 75% of period time as the deadline */
546 usecs = (750000 / runtime->rate) * runtime->period_size;
547 usecs += ((750000 % runtime->rate) * runtime->period_size) /
548 runtime->rate;
549
550 return usecs;
551}
552
9b0573c0
TI		 553static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
554{
555 snd_pcm_stream_lock_irq(substream);
556 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
557 substream->runtime->status->state = state;
558 snd_pcm_stream_unlock_irq(substream);
559}
560
90bbaf66
JY		 561static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
562 int event)
563{
564#ifdef CONFIG_SND_PCM_TIMER
565 if (substream->timer)
566 snd_timer_notify(substream->timer, event,
567 &substream->runtime->trigger_tstamp);
568#endif
569}
570
1e850bee
TI		 571static void snd_pcm_sync_stop(struct snd_pcm_substream *substream)
572{
573 if (substream->runtime->stop_operating) {
574 substream->runtime->stop_operating = false;
575 if (substream->ops->sync_stop)
576 substream->ops->sync_stop(substream);
577 }
578}
579
60f96aae
TS		 580/**
581 * snd_pcm_hw_param_choose - choose a configuration defined by @params
582 * @pcm: PCM instance
583 * @params: the hw_params instance
584 *
585 * Choose one configuration from configuration space defined by @params.
586 * The configuration chosen is that obtained fixing in this order:
587 * first access, first format, first subformat, min channels,
588 * min rate, min period time, max buffer size, min tick time
589 *
590 * Return: Zero if successful, or a negative error code on failure.
591 */
592static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
593 struct snd_pcm_hw_params *params)
594{
595 static const int vars[] = {
596 SNDRV_PCM_HW_PARAM_ACCESS,
597 SNDRV_PCM_HW_PARAM_FORMAT,
598 SNDRV_PCM_HW_PARAM_SUBFORMAT,
599 SNDRV_PCM_HW_PARAM_CHANNELS,
600 SNDRV_PCM_HW_PARAM_RATE,
601 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
602 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
603 SNDRV_PCM_HW_PARAM_TICK_TIME,
604 -1
605 };
606 const int *v;
7b8a54af
TS		 607 struct snd_mask old_mask;
608 struct snd_interval old_interval;
82e7d501 609 int changed;
60f96aae
TS		 610
611 for (v = vars; *v != -1; v++) {
7b8a54af
TS		 612 /* Keep old parameter to trace. */
613 if (trace_hw_mask_param_enabled()) {
614 if (hw_is_mask(*v))
615 old_mask = *hw_param_mask(params, *v);
616 }
617 if (trace_hw_interval_param_enabled()) {
618 if (hw_is_interval(*v))
619 old_interval = *hw_param_interval(params, *v);
620 }
60f96aae 621 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
82e7d501 622 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
60f96aae 623 else
82e7d501 624 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
e1a3a981 625 if (changed < 0)
82e7d501
TS		 626 return changed;
627 if (changed == 0)
628 continue;
7b8a54af 629
82e7d501 630 /* Trace the changed parameter. */
7b8a54af
TS		 631 if (hw_is_mask(*v)) {
632 trace_hw_mask_param(pcm, *v, 0, &old_mask,
633 hw_param_mask(params, *v));
634 }
635 if (hw_is_interval(*v)) {
636 trace_hw_interval_param(pcm, *v, 0, &old_interval,
637 hw_param_interval(params, *v));
638 }
60f96aae 639 }
7b8a54af 640
60f96aae
TS		 641 return 0;
642}
643
877211f5
TI		 644static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
645 struct snd_pcm_hw_params *params)
1da177e4 646{
877211f5 647 struct snd_pcm_runtime *runtime;
9442e691 648 int err, usecs;
1da177e4
LT		 649 unsigned int bits;
650 snd_pcm_uframes_t frames;
651
7eaa943c
TI		 652 if (PCM_RUNTIME_CHECK(substream))
653 return -ENXIO;
1da177e4 654 runtime = substream->runtime;
1da177e4
LT		 655 snd_pcm_stream_lock_irq(substream);
656 switch (runtime->status->state) {
657 case SNDRV_PCM_STATE_OPEN:
658 case SNDRV_PCM_STATE_SETUP:
659 case SNDRV_PCM_STATE_PREPARED:
660 break;
661 default:
662 snd_pcm_stream_unlock_irq(substream);
663 return -EBADFD;
664 }
665 snd_pcm_stream_unlock_irq(substream);
8eeaa2f9 666#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1da177e4
LT		 667 if (!substream->oss.oss)
668#endif
9c323fcb 669 if (atomic_read(&substream->mmap_count))
1da177e4
LT		 670 return -EBADFD;
671
1e850bee
TI		 672 snd_pcm_sync_stop(substream);
673
1da177e4
LT		 674 params->rmask = ~0U;
675 err = snd_pcm_hw_refine(substream, params);
676 if (err < 0)
677 goto _error;
678
679 err = snd_pcm_hw_params_choose(substream, params);
680 if (err < 0)
681 goto _error;
682
f9a076bf
TS		 683 err = fixup_unreferenced_params(substream, params);
684 if (err < 0)
685 goto _error;
686
0dba808e
TI		 687 if (substream->managed_buffer_alloc) {
688 err = snd_pcm_lib_malloc_pages(substream,
689 params_buffer_bytes(params));
690 if (err < 0)
691 goto _error;
692 runtime->buffer_changed = err > 0;
693 }
694
1da177e4
LT		 695 if (substream->ops->hw_params != NULL) {
696 err = substream->ops->hw_params(substream, params);
697 if (err < 0)
698 goto _error;
699 }
700
701 runtime->access = params_access(params);
702 runtime->format = params_format(params);
703 runtime->subformat = params_subformat(params);
704 runtime->channels = params_channels(params);
705 runtime->rate = params_rate(params);
706 runtime->period_size = params_period_size(params);
707 runtime->periods = params_periods(params);
708 runtime->buffer_size = params_buffer_size(params);
1da177e4
LT		 709 runtime->info = params->info;
710 runtime->rate_num = params->rate_num;
711 runtime->rate_den = params->rate_den;
ab69a490
CL		 712 runtime->no_period_wakeup =
713 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
714 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
1da177e4
LT		 715
716 bits = snd_pcm_format_physical_width(runtime->format);
717 runtime->sample_bits = bits;
718 bits *= runtime->channels;
719 runtime->frame_bits = bits;
720 frames = 1;
721 while (bits % 8 != 0) {
722 bits *= 2;
723 frames *= 2;
724 }
725 runtime->byte_align = bits / 8;
726 runtime->min_align = frames;
727
728 /* Default sw params */
729 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
730 runtime->period_step = 1;
1da177e4 731 runtime->control->avail_min = runtime->period_size;
1da177e4
LT		 732 runtime->start_threshold = 1;
733 runtime->stop_threshold = runtime->buffer_size;
734 runtime->silence_threshold = 0;
735 runtime->silence_size = 0;
ead4046b
CL		 736 runtime->boundary = runtime->buffer_size;
737 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
738 runtime->boundary *= 2;
1da177e4
LT		 739
740 snd_pcm_timer_resolution_change(substream);
9b0573c0 741 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
9442e691 742
82f68251
JB		 743 if (pm_qos_request_active(&substream->latency_pm_qos_req))
744 pm_qos_remove_request(&substream->latency_pm_qos_req);
9442e691 745 if ((usecs = period_to_usecs(runtime)) >= 0)
82f68251
JB		 746 pm_qos_add_request(&substream->latency_pm_qos_req,
747 PM_QOS_CPU_DMA_LATENCY, usecs);
1da177e4
LT		 748 return 0;
749 _error:
25985edc 750 /* hardware might be unusable from this time,
1da177e4
LT		 751 so we force application to retry to set
752 the correct hardware parameter settings */
9b0573c0 753 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
1da177e4
LT		 754 if (substream->ops->hw_free != NULL)
755 substream->ops->hw_free(substream);
0dba808e
TI		 756 if (substream->managed_buffer_alloc)
757 snd_pcm_lib_free_pages(substream);
1da177e4
LT		 758 return err;
759}
760
877211f5
TI		 761static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
762 struct snd_pcm_hw_params __user * _params)
1da177e4 763{
877211f5 764 struct snd_pcm_hw_params *params;
1da177e4
LT		 765 int err;
766
ef44a1ec
LZ		 767 params = memdup_user(_params, sizeof(*params));
768 if (IS_ERR(params))
769 return PTR_ERR(params);
770
1da177e4 771 err = snd_pcm_hw_params(substream, params);
f74ae15f
TS		 772 if (err < 0)
773 goto end;
ef44a1ec 774
f74ae15f
TS		 775 if (copy_to_user(_params, params, sizeof(*params)))
776 err = -EFAULT;
777end:
1da177e4
LT		 778 kfree(params);
779 return err;
780}
781
877211f5 782static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
1da177e4 783{
877211f5 784 struct snd_pcm_runtime *runtime;
1da177e4
LT		 785 int result = 0;
786
7eaa943c
TI		 787 if (PCM_RUNTIME_CHECK(substream))
788 return -ENXIO;
1da177e4 789 runtime = substream->runtime;
1da177e4
LT		 790 snd_pcm_stream_lock_irq(substream);
791 switch (runtime->status->state) {
792 case SNDRV_PCM_STATE_SETUP:
793 case SNDRV_PCM_STATE_PREPARED:
794 break;
795 default:
796 snd_pcm_stream_unlock_irq(substream);
797 return -EBADFD;
798 }
799 snd_pcm_stream_unlock_irq(substream);
9c323fcb 800 if (atomic_read(&substream->mmap_count))
1da177e4 801 return -EBADFD;
1e850bee 802 snd_pcm_sync_stop(substream);
1da177e4
LT		 803 if (substream->ops->hw_free)
804 result = substream->ops->hw_free(substream);
0dba808e
TI		 805 if (substream->managed_buffer_alloc)
806 snd_pcm_lib_free_pages(substream);
9b0573c0 807 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
82f68251 808 pm_qos_remove_request(&substream->latency_pm_qos_req);
1da177e4
LT		 809 return result;
810}
811
877211f5
TI		 812static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
813 struct snd_pcm_sw_params *params)
1da177e4 814{
877211f5 815 struct snd_pcm_runtime *runtime;
1250932e 816 int err;
1da177e4 817
7eaa943c
TI		 818 if (PCM_RUNTIME_CHECK(substream))
819 return -ENXIO;
1da177e4 820 runtime = substream->runtime;
1da177e4
LT		 821 snd_pcm_stream_lock_irq(substream);
822 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
823 snd_pcm_stream_unlock_irq(substream);
824 return -EBADFD;
825 }
826 snd_pcm_stream_unlock_irq(substream);
827
145d92e7
DC		 828 if (params->tstamp_mode < 0 ||
829 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
1da177e4 830 return -EINVAL;
58900810
TI		 831 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
832 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
5646eda5 833 return -EINVAL;
1da177e4
LT		 834 if (params->avail_min == 0)
835 return -EINVAL;
1da177e4
LT		 836 if (params->silence_size >= runtime->boundary) {
837 if (params->silence_threshold != 0)
838 return -EINVAL;
839 } else {
840 if (params->silence_size > params->silence_threshold)
841 return -EINVAL;
842 if (params->silence_threshold > runtime->buffer_size)
843 return -EINVAL;
844 }
1250932e 845 err = 0;
1da177e4
LT		 846 snd_pcm_stream_lock_irq(substream);
847 runtime->tstamp_mode = params->tstamp_mode;
58900810
TI		 848 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
849 runtime->tstamp_type = params->tstamp_type;
1da177e4
LT		 850 runtime->period_step = params->period_step;
851 runtime->control->avail_min = params->avail_min;
852 runtime->start_threshold = params->start_threshold;
853 runtime->stop_threshold = params->stop_threshold;
854 runtime->silence_threshold = params->silence_threshold;
855 runtime->silence_size = params->silence_size;
1da177e4
LT		 856 params->boundary = runtime->boundary;
857 if (snd_pcm_running(substream)) {
1da177e4
LT		 858 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
859 runtime->silence_size > 0)
860 snd_pcm_playback_silence(substream, ULONG_MAX);
1250932e 861 err = snd_pcm_update_state(substream, runtime);
1da177e4
LT		 862 }
863 snd_pcm_stream_unlock_irq(substream);
1250932e 864 return err;
1da177e4
LT		 865}
866
877211f5
TI		 867static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
868 struct snd_pcm_sw_params __user * _params)
1da177e4 869{
877211f5 870 struct snd_pcm_sw_params params;
1da177e4
LT		 871 int err;
872 if (copy_from_user(&params, _params, sizeof(params)))
873 return -EFAULT;
874 err = snd_pcm_sw_params(substream, &params);
875 if (copy_to_user(_params, &params, sizeof(params)))
876 return -EFAULT;
877 return err;
878}
879
c99c5a3b
TI		 880static inline snd_pcm_uframes_t
881snd_pcm_calc_delay(struct snd_pcm_substream *substream)
882{
883 snd_pcm_uframes_t delay;
884
885 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
886 delay = snd_pcm_playback_hw_avail(substream->runtime);
887 else
888 delay = snd_pcm_capture_avail(substream->runtime);
889 return delay + substream->runtime->delay;
890}
891
877211f5
TI		 892int snd_pcm_status(struct snd_pcm_substream *substream,
893 struct snd_pcm_status *status)
1da177e4 894{
877211f5 895 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 896
897 snd_pcm_stream_lock_irq(substream);
3179f620
PLB		 898
899 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
900 &runtime->audio_tstamp_config);
901
902 /* backwards compatible behavior */
903 if (runtime->audio_tstamp_config.type_requested ==
904 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
905 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
906 runtime->audio_tstamp_config.type_requested =
907 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
908 else
909 runtime->audio_tstamp_config.type_requested =
910 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
911 runtime->audio_tstamp_report.valid = 0;
912 } else
913 runtime->audio_tstamp_report.valid = 1;
914
1da177e4
LT		 915 status->state = runtime->status->state;
916 status->suspended_state = runtime->status->suspended_state;
917 if (status->state == SNDRV_PCM_STATE_OPEN)
918 goto _end;
919 status->trigger_tstamp = runtime->trigger_tstamp;
8c121586 920 if (snd_pcm_running(substream)) {
1da177e4 921 snd_pcm_update_hw_ptr(substream);
8c121586
JK		 922 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
923 status->tstamp = runtime->status->tstamp;
3179f620 924 status->driver_tstamp = runtime->driver_tstamp;
4eeaaeae
PLB		 925 status->audio_tstamp =
926 runtime->status->audio_tstamp;
3179f620
PLB		 927 if (runtime->audio_tstamp_report.valid == 1)
928 /* backwards compatibility, no report provided in COMPAT mode */
929 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
930 &status->audio_tstamp_accuracy,
931 &runtime->audio_tstamp_report);
932
8c121586
JK		 933 goto _tstamp_end;
934 }
0d59b814
PLB		 935 } else {
936 /* get tstamp only in fallback mode and only if enabled */
937 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
938 snd_pcm_gettime(runtime, &status->tstamp);
8c121586 939 }
8c121586 940 _tstamp_end:
1da177e4
LT		 941 status->appl_ptr = runtime->control->appl_ptr;
942 status->hw_ptr = runtime->status->hw_ptr;
763e5067 943 status->avail = snd_pcm_avail(substream);
c99c5a3b
TI		 944 status->delay = snd_pcm_running(substream) ?
945 snd_pcm_calc_delay(substream) : 0;
1da177e4
LT		 946 status->avail_max = runtime->avail_max;
947 status->overrange = runtime->overrange;
948 runtime->avail_max = 0;
949 runtime->overrange = 0;
950 _end:
951 snd_pcm_stream_unlock_irq(substream);
952 return 0;
953}
954
877211f5 955static int snd_pcm_status_user(struct snd_pcm_substream *substream,
38ca2a4d
PLB		 956 struct snd_pcm_status __user * _status,
957 bool ext)
1da177e4 958{
877211f5 959 struct snd_pcm_status status;
1da177e4 960 int res;
38ca2a4d 961
1da177e4 962 memset(&status, 0, sizeof(status));
38ca2a4d
PLB		 963 /*
964 * with extension, parameters are read/write,
965 * get audio_tstamp_data from user,
966 * ignore rest of status structure
967 */
968 if (ext && get_user(status.audio_tstamp_data,
969 (u32 __user *)(&_status->audio_tstamp_data)))
970 return -EFAULT;
1da177e4
LT		 971 res = snd_pcm_status(substream, &status);
972 if (res < 0)
973 return res;
974 if (copy_to_user(_status, &status, sizeof(status)))
975 return -EFAULT;
976 return 0;
977}
978
877211f5
TI		 979static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
980 struct snd_pcm_channel_info * info)
1da177e4 981{
877211f5 982 struct snd_pcm_runtime *runtime;
1da177e4
LT		 983 unsigned int channel;
984
1da177e4
LT		 985 channel = info->channel;
986 runtime = substream->runtime;
987 snd_pcm_stream_lock_irq(substream);
988 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
989 snd_pcm_stream_unlock_irq(substream);
990 return -EBADFD;
991 }
992 snd_pcm_stream_unlock_irq(substream);
993 if (channel >= runtime->channels)
994 return -EINVAL;
995 memset(info, 0, sizeof(*info));
996 info->channel = channel;
fc033cbf 997 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1da177e4
LT		 998}
999
877211f5
TI		 1000static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1001 struct snd_pcm_channel_info __user * _info)
1da177e4 1002{
877211f5 1003 struct snd_pcm_channel_info info;
1da177e4
LT		 1004 int res;
1005
1006 if (copy_from_user(&info, _info, sizeof(info)))
1007 return -EFAULT;
1008 res = snd_pcm_channel_info(substream, &info);
1009 if (res < 0)
1010 return res;
1011 if (copy_to_user(_info, &info, sizeof(info)))
1012 return -EFAULT;
1013 return 0;
1014}
1015
877211f5 1016static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1da177e4 1017{
877211f5 1018 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1019 if (runtime->trigger_master == NULL)
1020 return;
1021 if (runtime->trigger_master == substream) {
2b79d7a6
PLB		 1022 if (!runtime->trigger_tstamp_latched)
1023 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1da177e4
LT		 1024 } else {
1025 snd_pcm_trigger_tstamp(runtime->trigger_master);
1026 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1027 }
1028 runtime->trigger_master = NULL;
1029}
1030
1031struct action_ops {
877211f5
TI		 1032 int (*pre_action)(struct snd_pcm_substream *substream, int state);
1033 int (*do_action)(struct snd_pcm_substream *substream, int state);
1034 void (*undo_action)(struct snd_pcm_substream *substream, int state);
1035 void (*post_action)(struct snd_pcm_substream *substream, int state);
1da177e4
LT		 1036};
1037
1038/*
1039 * this functions is core for handling of linked stream
1040 * Note: the stream state might be changed also on failure
1041 * Note2: call with calling stream lock + link lock
1042 */
b17154cf 1043static int snd_pcm_action_group(const struct action_ops *ops,
877211f5 1044 struct snd_pcm_substream *substream,
1da177e4
LT		 1045 int state, int do_lock)
1046{
877211f5
TI		 1047 struct snd_pcm_substream *s = NULL;
1048 struct snd_pcm_substream *s1;
dde1c652 1049 int res = 0, depth = 1;
1da177e4 1050
ef991b95 1051 snd_pcm_group_for_each_entry(s, substream) {
257f8cce
TI		 1052 if (do_lock && s != substream) {
1053 if (s->pcm->nonatomic)
dde1c652 1054 mutex_lock_nested(&s->self_group.mutex, depth);
257f8cce 1055 else
dde1c652
TI		 1056 spin_lock_nested(&s->self_group.lock, depth);
1057 depth++;
257f8cce 1058 }
1da177e4
LT		 1059 res = ops->pre_action(s, state);
1060 if (res < 0)
1061 goto _unlock;
1062 }
ef991b95 1063 snd_pcm_group_for_each_entry(s, substream) {
1da177e4
LT		 1064 res = ops->do_action(s, state);
1065 if (res < 0) {
1066 if (ops->undo_action) {
ef991b95 1067 snd_pcm_group_for_each_entry(s1, substream) {
1da177e4
LT		 1068 if (s1 == s) /* failed stream */
1069 break;
1070 ops->undo_action(s1, state);
1071 }
1072 }
1073 s = NULL; /* unlock all */
1074 goto _unlock;
1075 }
1076 }
ef991b95 1077 snd_pcm_group_for_each_entry(s, substream) {
1da177e4
LT		 1078 ops->post_action(s, state);
1079 }
1080 _unlock:
1081 if (do_lock) {
1082 /* unlock streams */
ef991b95 1083 snd_pcm_group_for_each_entry(s1, substream) {
257f8cce 1084 if (s1 != substream) {
811deede 1085 if (s1->pcm->nonatomic)
257f8cce
TI		 1086 mutex_unlock(&s1->self_group.mutex);
1087 else
1088 spin_unlock(&s1->self_group.lock);
1089 }
1da177e4
LT		 1090 if (s1 == s) /* end */
1091 break;
1092 }
1093 }
1094 return res;
1095}
1096
1097/*
1098 * Note: call with stream lock
1099 */
b17154cf 1100static int snd_pcm_action_single(const struct action_ops *ops,
877211f5 1101 struct snd_pcm_substream *substream,
1da177e4
LT		 1102 int state)
1103{
1104 int res;
1105
1106 res = ops->pre_action(substream, state);
1107 if (res < 0)
1108 return res;
1109 res = ops->do_action(substream, state);
1110 if (res == 0)
1111 ops->post_action(substream, state);
1112 else if (ops->undo_action)
1113 ops->undo_action(substream, state);
1114 return res;
1115}
1116
a41c4cb9
TI		 1117static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1118 struct snd_pcm_group *new_group)
1119{
1120 substream->group = new_group;
1121 list_move(&substream->link_list, &new_group->substreams);
1122}
1123
f57f3df0
TI		 1124/*
1125 * Unref and unlock the group, but keep the stream lock;
1126 * when the group becomes empty and no longer referred, destroy itself
1127 */
1128static void snd_pcm_group_unref(struct snd_pcm_group *group,
1129 struct snd_pcm_substream *substream)
1130{
1131 bool do_free;
1132
1133 if (!group)
1134 return;
0e279dce 1135 do_free = refcount_dec_and_test(&group->refs);
f57f3df0
TI		 1136 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1137 if (do_free)
1138 kfree(group);
1139}
1140
1141/*
1142 * Lock the group inside a stream lock and reference it;
1143 * return the locked group object, or NULL if not linked
1144 */
1145static struct snd_pcm_group *
1146snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1147{
1148 bool nonatomic = substream->pcm->nonatomic;
1149 struct snd_pcm_group *group;
1150 bool trylock;
1151
1152 for (;;) {
1153 if (!snd_pcm_stream_linked(substream))
1154 return NULL;
1155 group = substream->group;
1156 /* block freeing the group object */
1157 refcount_inc(&group->refs);
1158
1159 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1160 spin_trylock(&group->lock);
1161 if (trylock)
1162 break; /* OK */
1163
1164 /* re-lock for avoiding ABBA deadlock */
1165 snd_pcm_stream_unlock(substream);
1166 snd_pcm_group_lock(group, nonatomic);
1167 snd_pcm_stream_lock(substream);
1168
1169 /* check the group again; the above opens a small race window */
1170 if (substream->group == group)
1171 break; /* OK */
1172 /* group changed, try again */
1173 snd_pcm_group_unref(group, substream);
1174 }
1175 return group;
1176}
1177
aa8edd8c
TI		 1178/*
1179 * Note: call with stream lock
1180 */
b17154cf 1181static int snd_pcm_action(const struct action_ops *ops,
aa8edd8c
TI		 1182 struct snd_pcm_substream *substream,
1183 int state)
257f8cce 1184{
f57f3df0 1185 struct snd_pcm_group *group;
257f8cce
TI		 1186 int res;
1187
f57f3df0
TI		 1188 group = snd_pcm_stream_group_ref(substream);
1189 if (group)
257f8cce 1190 res = snd_pcm_action_group(ops, substream, state, 1);
f57f3df0
TI		 1191 else
1192 res = snd_pcm_action_single(ops, substream, state);
1193 snd_pcm_group_unref(group, substream);
1da177e4
LT		 1194 return res;
1195}
1196
1197/*
1198 * Note: don't use any locks before
1199 */
b17154cf 1200static int snd_pcm_action_lock_irq(const struct action_ops *ops,
877211f5 1201 struct snd_pcm_substream *substream,
1da177e4
LT		 1202 int state)
1203{
1204 int res;
1205
e3a4bd5e
TI		 1206 snd_pcm_stream_lock_irq(substream);
1207 res = snd_pcm_action(ops, substream, state);
1208 snd_pcm_stream_unlock_irq(substream);
1da177e4
LT		 1209 return res;
1210}
1211
1212/*
1213 */
b17154cf 1214static int snd_pcm_action_nonatomic(const struct action_ops *ops,
877211f5 1215 struct snd_pcm_substream *substream,
1da177e4
LT		 1216 int state)
1217{
1218 int res;
1219
f57f3df0 1220 /* Guarantee the group members won't change during non-atomic action */
1da177e4
LT		 1221 down_read(&snd_pcm_link_rwsem);
1222 if (snd_pcm_stream_linked(substream))
1223 res = snd_pcm_action_group(ops, substream, state, 0);
1224 else
1225 res = snd_pcm_action_single(ops, substream, state);
1226 up_read(&snd_pcm_link_rwsem);
1227 return res;
1228}
1229
1230/*
1231 * start callbacks
1232 */
877211f5 1233static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1da177e4 1234{
877211f5 1235 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1236 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1237 return -EBADFD;
1238 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1239 !snd_pcm_playback_data(substream))
1240 return -EPIPE;
2b79d7a6 1241 runtime->trigger_tstamp_latched = false;
1da177e4
LT		 1242 runtime->trigger_master = substream;
1243 return 0;
1244}
1245
877211f5 1246static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1247{
1248 if (substream->runtime->trigger_master != substream)
1249 return 0;
1250 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1251}
1252
877211f5 1253static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1254{
1255 if (substream->runtime->trigger_master == substream)
1256 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1257}
1258
877211f5 1259static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1da177e4 1260{
877211f5 1261 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 1262 snd_pcm_trigger_tstamp(substream);
6af3fb72 1263 runtime->hw_ptr_jiffies = jiffies;
bd76af0f
JK		 1264 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1265 runtime->rate;
1da177e4
LT		 1266 runtime->status->state = state;
1267 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1268 runtime->silence_size > 0)
1269 snd_pcm_playback_silence(substream, ULONG_MAX);
90bbaf66 1270 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1da177e4
LT		 1271}
1272
b17154cf 1273static const struct action_ops snd_pcm_action_start = {
1da177e4
LT		 1274 .pre_action = snd_pcm_pre_start,
1275 .do_action = snd_pcm_do_start,
1276 .undo_action = snd_pcm_undo_start,
1277 .post_action = snd_pcm_post_start
1278};
1279
1280/**
1c85cc64 1281 * snd_pcm_start - start all linked streams
df8db936 1282 * @substream: the PCM substream instance
eb7c06e8
YB		 1283 *
1284 * Return: Zero if successful, or a negative error code.
c2c86a97 1285 * The stream lock must be acquired before calling this function.
1da177e4 1286 */
877211f5 1287int snd_pcm_start(struct snd_pcm_substream *substream)
1da177e4 1288{
877211f5
TI		 1289 return snd_pcm_action(&snd_pcm_action_start, substream,
1290 SNDRV_PCM_STATE_RUNNING);
1da177e4
LT		 1291}
1292
c2c86a97
TI		 1293/* take the stream lock and start the streams */
1294static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1295{
1296 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1297 SNDRV_PCM_STATE_RUNNING);
1298}
1299
1da177e4
LT		 1300/*
1301 * stop callbacks
1302 */
877211f5 1303static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1da177e4 1304{
877211f5 1305 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1306 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1307 return -EBADFD;
1308 runtime->trigger_master = substream;
1309 return 0;
1310}
1311
877211f5 1312static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1313{
1314 if (substream->runtime->trigger_master == substream &&
1315 snd_pcm_running(substream))
1316 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1317 return 0; /* unconditonally stop all substreams */
1318}
1319
877211f5 1320static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1da177e4 1321{
877211f5 1322 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1323 if (runtime->status->state != state) {
1324 snd_pcm_trigger_tstamp(substream);
9bc889b4 1325 runtime->status->state = state;
90bbaf66 1326 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1da177e4 1327 }
1e850bee 1328 runtime->stop_operating = true;
1da177e4 1329 wake_up(&runtime->sleep);
c91a988d 1330 wake_up(&runtime->tsleep);
1da177e4
LT		 1331}
1332
b17154cf 1333static const struct action_ops snd_pcm_action_stop = {
1da177e4
LT		 1334 .pre_action = snd_pcm_pre_stop,
1335 .do_action = snd_pcm_do_stop,
1336 .post_action = snd_pcm_post_stop
1337};
1338
1339/**
1c85cc64 1340 * snd_pcm_stop - try to stop all running streams in the substream group
df8db936
TI		 1341 * @substream: the PCM substream instance
1342 * @state: PCM state after stopping the stream
1da177e4 1343 *
1c85cc64 1344 * The state of each stream is then changed to the given state unconditionally.
eb7c06e8 1345 *
0a11458c 1346 * Return: Zero if successful, or a negative error code.
1da177e4 1347 */
fea952e5 1348int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1da177e4
LT		 1349{
1350 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1351}
e88e8ae6
TI		 1352EXPORT_SYMBOL(snd_pcm_stop);
1353
1da177e4 1354/**
1c85cc64 1355 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
df8db936 1356 * @substream: the PCM substream
1da177e4 1357 *
1c85cc64 1358 * After stopping, the state is changed to SETUP.
1da177e4 1359 * Unlike snd_pcm_stop(), this affects only the given stream.
eb7c06e8
YB		 1360 *
1361 * Return: Zero if succesful, or a negative error code.
1da177e4 1362 */
877211f5 1363int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1da177e4 1364{
877211f5
TI		 1365 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1366 SNDRV_PCM_STATE_SETUP);
1da177e4
LT		 1367}
1368
1fb8510c
TI		 1369/**
1370 * snd_pcm_stop_xrun - stop the running streams as XRUN
1371 * @substream: the PCM substream instance
1fb8510c
TI		 1372 *
1373 * This stops the given running substream (and all linked substreams) as XRUN.
1374 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1375 *
1376 * Return: Zero if successful, or a negative error code.
1377 */
1378int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1379{
1380 unsigned long flags;
1fb8510c
TI		 1381
1382 snd_pcm_stream_lock_irqsave(substream, flags);
e647f5a5 1383 if (substream->runtime && snd_pcm_running(substream))
9cd641ed 1384 __snd_pcm_xrun(substream);
1fb8510c 1385 snd_pcm_stream_unlock_irqrestore(substream, flags);
9cd641ed 1386 return 0;
1fb8510c
TI		 1387}
1388EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1389
1da177e4
LT		 1390/*
1391 * pause callbacks
1392 */
877211f5 1393static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1da177e4 1394{
877211f5 1395 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1396 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1397 return -ENOSYS;
1398 if (push) {
1399 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1400 return -EBADFD;
1401 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1402 return -EBADFD;
1403 runtime->trigger_master = substream;
1404 return 0;
1405}
1406
877211f5 1407static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1da177e4
LT		 1408{
1409 if (substream->runtime->trigger_master != substream)
1410 return 0;
56385a12
JK		 1411 /* some drivers might use hw_ptr to recover from the pause -
1412 update the hw_ptr now */
1413 if (push)
1414 snd_pcm_update_hw_ptr(substream);
6af3fb72 1415 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
b595076a 1416 * a delta between the current jiffies, this gives a large enough
6af3fb72
TI		 1417 * delta, effectively to skip the check once.
1418 */
1419 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1da177e4
LT		 1420 return substream->ops->trigger(substream,
1421 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1422 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1423}
1424
877211f5 1425static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1da177e4
LT		 1426{
1427 if (substream->runtime->trigger_master == substream)
1428 substream->ops->trigger(substream,
1429 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1430 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1431}
1432
877211f5 1433static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1da177e4 1434{
877211f5 1435 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1436 snd_pcm_trigger_tstamp(substream);
1437 if (push) {
1438 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
90bbaf66 1439 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1da177e4 1440 wake_up(&runtime->sleep);
c91a988d 1441 wake_up(&runtime->tsleep);
1da177e4
LT		 1442 } else {
1443 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
90bbaf66 1444 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1da177e4
LT		 1445 }
1446}
1447
b17154cf 1448static const struct action_ops snd_pcm_action_pause = {
1da177e4
LT		 1449 .pre_action = snd_pcm_pre_pause,
1450 .do_action = snd_pcm_do_pause,
1451 .undo_action = snd_pcm_undo_pause,
1452 .post_action = snd_pcm_post_pause
1453};
1454
1455/*
1456 * Push/release the pause for all linked streams.
1457 */
877211f5 1458static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1da177e4
LT		 1459{
1460 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1461}
1462
1463#ifdef CONFIG_PM
1464/* suspend */
1465
877211f5 1466static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1da177e4 1467{
877211f5 1468 struct snd_pcm_runtime *runtime = substream->runtime;
113ce081
TI		 1469 switch (runtime->status->state) {
1470 case SNDRV_PCM_STATE_SUSPENDED:
1da177e4 1471 return -EBUSY;
113ce081
TI		 1472 /* unresumable PCM state; return -EBUSY for skipping suspend */
1473 case SNDRV_PCM_STATE_OPEN:
1474 case SNDRV_PCM_STATE_SETUP:
1475 case SNDRV_PCM_STATE_DISCONNECTED:
1476 return -EBUSY;
1477 }
1da177e4
LT		 1478 runtime->trigger_master = substream;
1479 return 0;
1480}
1481
877211f5 1482static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1da177e4 1483{
877211f5 1484 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1485 if (runtime->trigger_master != substream)
1486 return 0;
1487 if (! snd_pcm_running(substream))
1488 return 0;
1489 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1490 return 0; /* suspend unconditionally */
1491}
1492
877211f5 1493static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1da177e4 1494{
877211f5 1495 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 1496 snd_pcm_trigger_tstamp(substream);
9bc889b4
TI		 1497 runtime->status->suspended_state = runtime->status->state;
1498 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
90bbaf66 1499 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1da177e4 1500 wake_up(&runtime->sleep);
c91a988d 1501 wake_up(&runtime->tsleep);
1da177e4
LT		 1502}
1503
b17154cf 1504static const struct action_ops snd_pcm_action_suspend = {
1da177e4
LT		 1505 .pre_action = snd_pcm_pre_suspend,
1506 .do_action = snd_pcm_do_suspend,
1507 .post_action = snd_pcm_post_suspend
1508};
1509
ce7f93e2 1510/*
1c85cc64 1511 * snd_pcm_suspend - trigger SUSPEND to all linked streams
df8db936 1512 * @substream: the PCM substream
1da177e4 1513 *
1da177e4 1514 * After this call, all streams are changed to SUSPENDED state.
eb7c06e8 1515 *
ce7f93e2 1516 * Return: Zero if successful, or a negative error code.
1da177e4 1517 */
ce7f93e2 1518static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1da177e4
LT		 1519{
1520 int err;
1521 unsigned long flags;
1522
1523 snd_pcm_stream_lock_irqsave(substream, flags);
1524 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1525 snd_pcm_stream_unlock_irqrestore(substream, flags);
1526 return err;
1527}
e88e8ae6 1528
1da177e4 1529/**
1c85cc64 1530 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
df8db936 1531 * @pcm: the PCM instance
1da177e4 1532 *
1da177e4 1533 * After this call, all streams are changed to SUSPENDED state.
eb7c06e8
YB		 1534 *
1535 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1da177e4 1536 */
877211f5 1537int snd_pcm_suspend_all(struct snd_pcm *pcm)
1da177e4 1538{
877211f5 1539 struct snd_pcm_substream *substream;
1da177e4
LT		 1540 int stream, err = 0;
1541
603bf524
TI		 1542 if (! pcm)
1543 return 0;
1544
1da177e4 1545 for (stream = 0; stream < 2; stream++) {
877211f5
TI		 1546 for (substream = pcm->streams[stream].substream;
1547 substream; substream = substream->next) {
1da177e4
LT		 1548 /* FIXME: the open/close code should lock this as well */
1549 if (substream->runtime == NULL)
1550 continue;
d9c0b2af
RS		 1551
1552 /*
1553 * Skip BE dai link PCM's that are internal and may
1554 * not have their substream ops set.
1555 */
1556 if (!substream->ops)
1557 continue;
1558
1da177e4
LT		 1559 err = snd_pcm_suspend(substream);
1560 if (err < 0 && err != -EBUSY)
1561 return err;
1562 }
1563 }
1564 return 0;
1565}
e88e8ae6
TI		 1566EXPORT_SYMBOL(snd_pcm_suspend_all);
1567
1da177e4
LT		 1568/* resume */
1569
877211f5 1570static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1da177e4 1571{
877211f5 1572 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1573 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1574 return -ENOSYS;
1575 runtime->trigger_master = substream;
1576 return 0;
1577}
1578
877211f5 1579static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1da177e4 1580{
877211f5 1581 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1582 if (runtime->trigger_master != substream)
1583 return 0;
1584 /* DMA not running previously? */
1585 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1586 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1587 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1588 return 0;
1589 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1590}
1591
877211f5 1592static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1593{
1594 if (substream->runtime->trigger_master == substream &&
1595 snd_pcm_running(substream))
1596 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1597}
1598
877211f5 1599static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1da177e4 1600{
877211f5 1601 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 1602 snd_pcm_trigger_tstamp(substream);
9bc889b4 1603 runtime->status->state = runtime->status->suspended_state;
90bbaf66 1604 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1e850bee 1605 snd_pcm_sync_stop(substream);
1da177e4
LT		 1606}
1607
b17154cf 1608static const struct action_ops snd_pcm_action_resume = {
1da177e4
LT		 1609 .pre_action = snd_pcm_pre_resume,
1610 .do_action = snd_pcm_do_resume,
1611 .undo_action = snd_pcm_undo_resume,
1612 .post_action = snd_pcm_post_resume
1613};
1614
877211f5 1615static int snd_pcm_resume(struct snd_pcm_substream *substream)
1da177e4 1616{
68b4acd3 1617 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1da177e4
LT		 1618}
1619
1620#else
1621
877211f5 1622static int snd_pcm_resume(struct snd_pcm_substream *substream)
1da177e4
LT		 1623{
1624 return -ENOSYS;
1625}
1626
1627#endif /* CONFIG_PM */
1628
1629/*
1630 * xrun ioctl
1631 *
1632 * Change the RUNNING stream(s) to XRUN state.
1633 */
877211f5 1634static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1da177e4 1635{
877211f5 1636 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1637 int result;
1638
1da177e4
LT		 1639 snd_pcm_stream_lock_irq(substream);
1640 switch (runtime->status->state) {
1641 case SNDRV_PCM_STATE_XRUN:
1642 result = 0; /* already there */
1643 break;
1644 case SNDRV_PCM_STATE_RUNNING:
9cd641ed
TI		 1645 __snd_pcm_xrun(substream);
1646 result = 0;
1da177e4
LT		 1647 break;
1648 default:
1649 result = -EBADFD;
1650 }
1651 snd_pcm_stream_unlock_irq(substream);
1da177e4
LT		 1652 return result;
1653}
1654
1655/*
1656 * reset ioctl
1657 */
877211f5 1658static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1da177e4 1659{
877211f5 1660 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1661 switch (runtime->status->state) {
1662 case SNDRV_PCM_STATE_RUNNING:
1663 case SNDRV_PCM_STATE_PREPARED:
1664 case SNDRV_PCM_STATE_PAUSED:
1665 case SNDRV_PCM_STATE_SUSPENDED:
1666 return 0;
1667 default:
1668 return -EBADFD;
1669 }
1670}
1671
877211f5 1672static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1da177e4 1673{
877211f5 1674 struct snd_pcm_runtime *runtime = substream->runtime;
fc033cbf 1675 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1da177e4
LT		 1676 if (err < 0)
1677 return err;
1da177e4 1678 runtime->hw_ptr_base = 0;
e7636925
JK		 1679 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1680 runtime->status->hw_ptr % runtime->period_size;
1da177e4
LT		 1681 runtime->silence_start = runtime->status->hw_ptr;
1682 runtime->silence_filled = 0;
1683 return 0;
1684}
1685
877211f5 1686static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1da177e4 1687{
877211f5 1688 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1689 runtime->control->appl_ptr = runtime->status->hw_ptr;
1690 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1691 runtime->silence_size > 0)
1692 snd_pcm_playback_silence(substream, ULONG_MAX);
1693}
1694
b17154cf 1695static const struct action_ops snd_pcm_action_reset = {
1da177e4
LT		 1696 .pre_action = snd_pcm_pre_reset,
1697 .do_action = snd_pcm_do_reset,
1698 .post_action = snd_pcm_post_reset
1699};
1700
877211f5 1701static int snd_pcm_reset(struct snd_pcm_substream *substream)
1da177e4
LT		 1702{
1703 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1704}
1705
1706/*
1707 * prepare ioctl
1708 */
0df63e44
TI		 1709/* we use the second argument for updating f_flags */
1710static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1711 int f_flags)
1da177e4 1712{
877211f5 1713 struct snd_pcm_runtime *runtime = substream->runtime;
de1b8b93
TI		 1714 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1715 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1da177e4
LT		 1716 return -EBADFD;
1717 if (snd_pcm_running(substream))
1718 return -EBUSY;
0df63e44 1719 substream->f_flags = f_flags;
1da177e4
LT		 1720 return 0;
1721}
1722
877211f5 1723static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1724{
1725 int err;
1e850bee 1726 snd_pcm_sync_stop(substream);
1da177e4
LT		 1727 err = substream->ops->prepare(substream);
1728 if (err < 0)
1729 return err;
1730 return snd_pcm_do_reset(substream, 0);
1731}
1732
877211f5 1733static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1da177e4 1734{
877211f5 1735 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 1736 runtime->control->appl_ptr = runtime->status->hw_ptr;
9b0573c0 1737 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1da177e4
LT		 1738}
1739
b17154cf 1740static const struct action_ops snd_pcm_action_prepare = {
1da177e4
LT		 1741 .pre_action = snd_pcm_pre_prepare,
1742 .do_action = snd_pcm_do_prepare,
1743 .post_action = snd_pcm_post_prepare
1744};
1745
1746/**
1c85cc64 1747 * snd_pcm_prepare - prepare the PCM substream to be triggerable
df8db936 1748 * @substream: the PCM substream instance
0df63e44 1749 * @file: file to refer f_flags
eb7c06e8
YB		 1750 *
1751 * Return: Zero if successful, or a negative error code.
1da177e4 1752 */
0df63e44
TI		 1753static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1754 struct file *file)
1da177e4 1755{
0df63e44
TI		 1756 int f_flags;
1757
1758 if (file)
1759 f_flags = file->f_flags;
1760 else
1761 f_flags = substream->f_flags;
1da177e4 1762
1b745cd9
TI		 1763 snd_pcm_stream_lock_irq(substream);
1764 switch (substream->runtime->status->state) {
1765 case SNDRV_PCM_STATE_PAUSED:
1766 snd_pcm_pause(substream, 0);
1767 /* fallthru */
1768 case SNDRV_PCM_STATE_SUSPENDED:
1769 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1770 break;
1771 }
1772 snd_pcm_stream_unlock_irq(substream);
1773
68b4acd3
TI		 1774 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1775 substream, f_flags);
1da177e4
LT		 1776}
1777
1778/*
1779 * drain ioctl
1780 */
1781
877211f5 1782static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1da177e4 1783{
4f7c39dc
TI		 1784 struct snd_pcm_runtime *runtime = substream->runtime;
1785 switch (runtime->status->state) {
1786 case SNDRV_PCM_STATE_OPEN:
1787 case SNDRV_PCM_STATE_DISCONNECTED:
1788 case SNDRV_PCM_STATE_SUSPENDED:
1789 return -EBADFD;
1790 }
1791 runtime->trigger_master = substream;
1da177e4
LT		 1792 return 0;
1793}
1794
877211f5 1795static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1da177e4 1796{
877211f5 1797 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1798 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1799 switch (runtime->status->state) {
1800 case SNDRV_PCM_STATE_PREPARED:
1801 /* start playback stream if possible */
1802 if (! snd_pcm_playback_empty(substream)) {
1803 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1804 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
70372a75
TI		 1805 } else {
1806 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1da177e4
LT		 1807 }
1808 break;
1809 case SNDRV_PCM_STATE_RUNNING:
1810 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1811 break;
4f7c39dc
TI		 1812 case SNDRV_PCM_STATE_XRUN:
1813 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1814 break;
1da177e4
LT		 1815 default:
1816 break;
1817 }
1818 } else {
1819 /* stop running stream */
1820 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
b05e5787 1821 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1da177e4 1822 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
b05e5787
MŚ		 1823 snd_pcm_do_stop(substream, new_state);
1824 snd_pcm_post_stop(substream, new_state);
1da177e4
LT		 1825 }
1826 }
48d88297
LY		 1827
1828 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1829 runtime->trigger_master == substream &&
1830 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1831 return substream->ops->trigger(substream,
1832 SNDRV_PCM_TRIGGER_DRAIN);
1833
1da177e4
LT		 1834 return 0;
1835}
1836
877211f5 1837static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1838{
1839}
1840
b17154cf 1841static const struct action_ops snd_pcm_action_drain_init = {
1da177e4
LT		 1842 .pre_action = snd_pcm_pre_drain_init,
1843 .do_action = snd_pcm_do_drain_init,
1844 .post_action = snd_pcm_post_drain_init
1845};
1846
1da177e4
LT		 1847/*
1848 * Drain the stream(s).
1849 * When the substream is linked, sync until the draining of all playback streams
1850 * is finished.
1851 * After this call, all streams are supposed to be either SETUP or DRAINING
1852 * (capture only) state.
1853 */
4cdc115f
TI		 1854static int snd_pcm_drain(struct snd_pcm_substream *substream,
1855 struct file *file)
1da177e4 1856{
877211f5
TI		 1857 struct snd_card *card;
1858 struct snd_pcm_runtime *runtime;
ef991b95 1859 struct snd_pcm_substream *s;
f57f3df0 1860 struct snd_pcm_group *group;
ac6424b9 1861 wait_queue_entry_t wait;
1da177e4 1862 int result = 0;
4cdc115f 1863 int nonblock = 0;
1da177e4 1864
1da177e4
LT		 1865 card = substream->pcm->card;
1866 runtime = substream->runtime;
1867
1868 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1869 return -EBADFD;
1870
4cdc115f
TI		 1871 if (file) {
1872 if (file->f_flags & O_NONBLOCK)
1873 nonblock = 1;
1874 } else if (substream->f_flags & O_NONBLOCK)
1875 nonblock = 1;
1876
21cb2a2e
TI		 1877 snd_pcm_stream_lock_irq(substream);
1878 /* resume pause */
d3a7dcfe 1879 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
21cb2a2e
TI		 1880 snd_pcm_pause(substream, 0);
1881
1882 /* pre-start/stop - all running streams are changed to DRAINING state */
1883 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
4cdc115f
TI		 1884 if (result < 0)
1885 goto unlock;
1886 /* in non-blocking, we don't wait in ioctl but let caller poll */
1887 if (nonblock) {
1888 result = -EAGAIN;
1889 goto unlock;
21cb2a2e 1890 }
1da177e4
LT		 1891
1892 for (;;) {
1893 long tout;
d3a7dcfe 1894 struct snd_pcm_runtime *to_check;
1da177e4
LT		 1895 if (signal_pending(current)) {
1896 result = -ERESTARTSYS;
1897 break;
1898 }
d3a7dcfe
TI		 1899 /* find a substream to drain */
1900 to_check = NULL;
f57f3df0 1901 group = snd_pcm_stream_group_ref(substream);
d3a7dcfe
TI		 1902 snd_pcm_group_for_each_entry(s, substream) {
1903 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1904 continue;
1905 runtime = s->runtime;
1906 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1907 to_check = runtime;
21cb2a2e 1908 break;
d3a7dcfe 1909 }
21cb2a2e 1910 }
f57f3df0 1911 snd_pcm_group_unref(group, substream);
d3a7dcfe
TI		 1912 if (!to_check)
1913 break; /* all drained */
1914 init_waitqueue_entry(&wait, current);
37151a41 1915 set_current_state(TASK_INTERRUPTIBLE);
d3a7dcfe 1916 add_wait_queue(&to_check->sleep, &wait);
1da177e4 1917 snd_pcm_stream_unlock_irq(substream);
f2b3614c
TI		 1918 if (runtime->no_period_wakeup)
1919 tout = MAX_SCHEDULE_TIMEOUT;
1920 else {
1921 tout = 10;
1922 if (runtime->rate) {
1923 long t = runtime->period_size * 2 / runtime->rate;
1924 tout = max(t, tout);
1925 }
1926 tout = msecs_to_jiffies(tout * 1000);
1927 }
37151a41 1928 tout = schedule_timeout(tout);
f57f3df0 1929
1da177e4 1930 snd_pcm_stream_lock_irq(substream);
f57f3df0
TI		 1931 group = snd_pcm_stream_group_ref(substream);
1932 snd_pcm_group_for_each_entry(s, substream) {
1933 if (s->runtime == to_check) {
1934 remove_wait_queue(&to_check->sleep, &wait);
1935 break;
1936 }
1937 }
1938 snd_pcm_group_unref(group, substream);
1939
0914f796
TI		 1940 if (card->shutdown) {
1941 result = -ENODEV;
1942 break;
1943 }
1da177e4
LT		 1944 if (tout == 0) {
1945 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1946 result = -ESTRPIPE;
1947 else {
09e56df8
TI		 1948 dev_dbg(substream->pcm->card->dev,
1949 "playback drain error (DMA or IRQ trouble?)\n");
1da177e4
LT		 1950 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1951 result = -EIO;
1952 }
1953 break;
1954 }
1da177e4 1955 }
21cb2a2e 1956
4cdc115f 1957 unlock:
21cb2a2e 1958 snd_pcm_stream_unlock_irq(substream);
1da177e4
LT		 1959
1960 return result;
1961}
1962
1963/*
1964 * drop ioctl
1965 *
1966 * Immediately put all linked substreams into SETUP state.
1967 */
877211f5 1968static int snd_pcm_drop(struct snd_pcm_substream *substream)
1da177e4 1969{
877211f5 1970 struct snd_pcm_runtime *runtime;
1da177e4
LT		 1971 int result = 0;
1972
7eaa943c
TI		 1973 if (PCM_RUNTIME_CHECK(substream))
1974 return -ENXIO;
1da177e4 1975 runtime = substream->runtime;
1da177e4 1976
de1b8b93 1977 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
4b95ff78 1978 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1da177e4
LT		 1979 return -EBADFD;
1980
1da177e4
LT		 1981 snd_pcm_stream_lock_irq(substream);
1982 /* resume pause */
1983 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1984 snd_pcm_pause(substream, 0);
1985
1986 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1987 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1988 snd_pcm_stream_unlock_irq(substream);
24e8fc49 1989
1da177e4
LT		 1990 return result;
1991}
1992
1993
0888c321 1994static bool is_pcm_file(struct file *file)
1da177e4 1995{
0888c321 1996 struct inode *inode = file_inode(file);
d819fb21 1997 struct snd_pcm *pcm;
f87135f5
CL		 1998 unsigned int minor;
1999
0888c321
AV		 2000 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2001 return false;
1da177e4 2002 minor = iminor(inode);
d819fb21
TI		 2003 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2004 if (!pcm)
2005 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2006 if (!pcm)
2007 return false;
2008 snd_card_unref(pcm->card);
2009 return true;
1da177e4
LT		 2010}
2011
2012/*
2013 * PCM link handling
2014 */
877211f5 2015static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1da177e4
LT		 2016{
2017 int res = 0;
877211f5
TI		 2018 struct snd_pcm_file *pcm_file;
2019 struct snd_pcm_substream *substream1;
f57f3df0
TI		 2020 struct snd_pcm_group *group, *target_group;
2021 bool nonatomic = substream->pcm->nonatomic;
0888c321 2022 struct fd f = fdget(fd);
1da177e4 2023
0888c321 2024 if (!f.file)
1da177e4 2025 return -EBADFD;
0888c321
AV		 2026 if (!is_pcm_file(f.file)) {
2027 res = -EBADFD;
2028 goto _badf;
2029 }
2030 pcm_file = f.file->private_data;
1da177e4 2031 substream1 = pcm_file->substream;
73365cb1 2032 group = kzalloc(sizeof(*group), GFP_KERNEL);
1662591b
TI		 2033 if (!group) {
2034 res = -ENOMEM;
2035 goto _nolock;
2036 }
73365cb1 2037 snd_pcm_group_init(group);
f57f3df0 2038
ecb41f0f 2039 down_write(&snd_pcm_link_rwsem);
1da177e4 2040 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
257f8cce
TI		 2041 substream->runtime->status->state != substream1->runtime->status->state ||
2042 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1da177e4
LT		 2043 res = -EBADFD;
2044 goto _end;
2045 }
2046 if (snd_pcm_stream_linked(substream1)) {
2047 res = -EALREADY;
2048 goto _end;
2049 }
f57f3df0
TI		 2050
2051 snd_pcm_stream_lock_irq(substream);
1da177e4 2052 if (!snd_pcm_stream_linked(substream)) {
a41c4cb9 2053 snd_pcm_group_assign(substream, group);
f57f3df0 2054 group = NULL; /* assigned, don't free this one below */
1da177e4 2055 }
f57f3df0
TI		 2056 target_group = substream->group;
2057 snd_pcm_stream_unlock_irq(substream);
2058
2059 snd_pcm_group_lock_irq(target_group, nonatomic);
2060 snd_pcm_stream_lock(substream1);
2061 snd_pcm_group_assign(substream1, target_group);
0e279dce 2062 refcount_inc(&target_group->refs);
f57f3df0
TI		 2063 snd_pcm_stream_unlock(substream1);
2064 snd_pcm_group_unlock_irq(target_group, nonatomic);
1da177e4 2065 _end:
1da177e4 2066 up_write(&snd_pcm_link_rwsem);
1662591b 2067 _nolock:
dd6c5cd8 2068 kfree(group);
0888c321
AV		 2069 _badf:
2070 fdput(f);
1da177e4
LT		 2071 return res;
2072}
2073
877211f5 2074static void relink_to_local(struct snd_pcm_substream *substream)
1da177e4 2075{
f57f3df0 2076 snd_pcm_stream_lock(substream);
a41c4cb9 2077 snd_pcm_group_assign(substream, &substream->self_group);
f57f3df0 2078 snd_pcm_stream_unlock(substream);
1da177e4
LT		 2079}
2080
877211f5 2081static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1da177e4 2082{
a41c4cb9 2083 struct snd_pcm_group *group;
f57f3df0
TI		 2084 bool nonatomic = substream->pcm->nonatomic;
2085 bool do_free = false;
1da177e4
LT		 2086 int res = 0;
2087
ecb41f0f 2088 down_write(&snd_pcm_link_rwsem);
f57f3df0 2089
1da177e4
LT		 2090 if (!snd_pcm_stream_linked(substream)) {
2091 res = -EALREADY;
2092 goto _end;
2093 }
a41c4cb9
TI		 2094
2095 group = substream->group;
f57f3df0 2096 snd_pcm_group_lock_irq(group, nonatomic);
a41c4cb9 2097
1da177e4 2098 relink_to_local(substream);
0e279dce 2099 refcount_dec(&group->refs);
a41c4cb9
TI		 2100
2101 /* detach the last stream, too */
2102 if (list_is_singular(&group->substreams)) {
7df5a5f6
TI		 2103 relink_to_local(list_first_entry(&group->substreams,
2104 struct snd_pcm_substream,
2105 link_list));
0e279dce 2106 do_free = refcount_dec_and_test(&group->refs);
1da177e4 2107 }
a41c4cb9 2108
f57f3df0
TI		 2109 snd_pcm_group_unlock_irq(group, nonatomic);
2110 if (do_free)
2111 kfree(group);
2112
1da177e4 2113 _end:
1da177e4
LT		 2114 up_write(&snd_pcm_link_rwsem);
2115 return res;
2116}
2117
2118/*
2119 * hw configurator
2120 */
877211f5
TI		 2121static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2122 struct snd_pcm_hw_rule *rule)
1da177e4 2123{
877211f5 2124 struct snd_interval t;
1da177e4
LT		 2125 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2126 hw_param_interval_c(params, rule->deps[1]), &t);
2127 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2128}
2129
877211f5
TI		 2130static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2131 struct snd_pcm_hw_rule *rule)
1da177e4 2132{
877211f5 2133 struct snd_interval t;
1da177e4
LT		 2134 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2135 hw_param_interval_c(params, rule->deps[1]), &t);
2136 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2137}
2138
877211f5
TI		 2139static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2140 struct snd_pcm_hw_rule *rule)
1da177e4 2141{
877211f5 2142 struct snd_interval t;
1da177e4
LT		 2143 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2144 hw_param_interval_c(params, rule->deps[1]),
2145 (unsigned long) rule->private, &t);
2146 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2147}
2148
877211f5
TI		 2149static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2150 struct snd_pcm_hw_rule *rule)
1da177e4 2151{
877211f5 2152 struct snd_interval t;
1da177e4
LT		 2153 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2154 (unsigned long) rule->private,
2155 hw_param_interval_c(params, rule->deps[1]), &t);
2156 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2157}
2158
877211f5
TI		 2159static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2160 struct snd_pcm_hw_rule *rule)
1da177e4
LT		 2161{
2162 unsigned int k;
b55f9fdc
TS		 2163 const struct snd_interval *i =
2164 hw_param_interval_c(params, rule->deps[0]);
877211f5
TI		 2165 struct snd_mask m;
2166 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1da177e4
LT		 2167 snd_mask_any(&m);
2168 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2169 int bits;
2170 if (! snd_mask_test(mask, k))
2171 continue;
2172 bits = snd_pcm_format_physical_width(k);
2173 if (bits <= 0)
2174 continue; /* ignore invalid formats */
2175 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2176 snd_mask_reset(&m, k);
2177 }
2178 return snd_mask_refine(mask, &m);
2179}
2180
877211f5
TI		 2181static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2182 struct snd_pcm_hw_rule *rule)
1da177e4 2183{
877211f5 2184 struct snd_interval t;
1da177e4
LT		 2185 unsigned int k;
2186 t.min = UINT_MAX;
2187 t.max = 0;
2188 t.openmin = 0;
2189 t.openmax = 0;
2190 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2191 int bits;
2192 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2193 continue;
2194 bits = snd_pcm_format_physical_width(k);
2195 if (bits <= 0)
2196 continue; /* ignore invalid formats */
2197 if (t.min > (unsigned)bits)
2198 t.min = bits;
2199 if (t.max < (unsigned)bits)
2200 t.max = bits;
2201 }
2202 t.integer = 1;
2203 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2204}
2205
2206#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2207#error "Change this table"
2208#endif
2209
8b674308
TS		 2210static const unsigned int rates[] = {
2211 5512, 8000, 11025, 16000, 22050, 32000, 44100,
4cc4531c 2212 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
8b674308 2213};
1da177e4 2214
7653d557
CL		 2215const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2216 .count = ARRAY_SIZE(rates),
2217 .list = rates,
2218};
2219
877211f5
TI		 2220static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2221 struct snd_pcm_hw_rule *rule)
1da177e4 2222{
877211f5 2223 struct snd_pcm_hardware *hw = rule->private;
1da177e4 2224 return snd_interval_list(hw_param_interval(params, rule->var),
7653d557
CL		 2225 snd_pcm_known_rates.count,
2226 snd_pcm_known_rates.list, hw->rates);
1da177e4
LT		 2227}
2228
877211f5
TI		 2229static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2230 struct snd_pcm_hw_rule *rule)
1da177e4 2231{
877211f5
TI		 2232 struct snd_interval t;
2233 struct snd_pcm_substream *substream = rule->private;
1da177e4
LT		 2234 t.min = 0;
2235 t.max = substream->buffer_bytes_max;
2236 t.openmin = 0;
2237 t.openmax = 0;
2238 t.integer = 1;
2239 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2240}
2241
877211f5 2242int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1da177e4 2243{
877211f5
TI		 2244 struct snd_pcm_runtime *runtime = substream->runtime;
2245 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1da177e4
LT		 2246 int k, err;
2247
2248 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2249 snd_mask_any(constrs_mask(constrs, k));
2250 }
2251
2252 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2253 snd_interval_any(constrs_interval(constrs, k));
2254 }
2255
2256 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2257 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2258 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2259 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2260 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2261
2262 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2263 snd_pcm_hw_rule_format, NULL,
2264 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2265 if (err < 0)
2266 return err;
2267 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2268 snd_pcm_hw_rule_sample_bits, NULL,
2269 SNDRV_PCM_HW_PARAM_FORMAT,
2270 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2271 if (err < 0)
2272 return err;
2273 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2274 snd_pcm_hw_rule_div, NULL,
2275 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2276 if (err < 0)
2277 return err;
2278 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2279 snd_pcm_hw_rule_mul, NULL,
2280 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2281 if (err < 0)
2282 return err;
2283 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2284 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2285 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2286 if (err < 0)
2287 return err;
2288 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2289 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2290 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2291 if (err < 0)
2292 return err;
2293 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2294 snd_pcm_hw_rule_div, NULL,
2295 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2296 if (err < 0)
2297 return err;
2298 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2299 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2300 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2301 if (err < 0)
2302 return err;
2303 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2304 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2305 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2306 if (err < 0)
2307 return err;
2308 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2309 snd_pcm_hw_rule_div, NULL,
2310 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2311 if (err < 0)
2312 return err;
2313 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2314 snd_pcm_hw_rule_div, NULL,
2315 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2316 if (err < 0)
2317 return err;
2318 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2319 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2320 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2321 if (err < 0)
2322 return err;
2323 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2324 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2325 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2326 if (err < 0)
2327 return err;
2328 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2329 snd_pcm_hw_rule_mul, NULL,
2330 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2331 if (err < 0)
2332 return err;
2333 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2334 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2335 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2336 if (err < 0)
2337 return err;
2338 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2339 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2340 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2341 if (err < 0)
2342 return err;
2343 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2344 snd_pcm_hw_rule_muldivk, (void*) 8,
2345 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2346 if (err < 0)
2347 return err;
2348 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2349 snd_pcm_hw_rule_muldivk, (void*) 8,
2350 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2351 if (err < 0)
2352 return err;
2353 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2354 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2355 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2356 if (err < 0)
2357 return err;
2358 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2359 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2360 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2361 if (err < 0)
2362 return err;
2363 return 0;
2364}
2365
877211f5 2366int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1da177e4 2367{
877211f5
TI		 2368 struct snd_pcm_runtime *runtime = substream->runtime;
2369 struct snd_pcm_hardware *hw = &runtime->hw;
1da177e4
LT		 2370 int err;
2371 unsigned int mask = 0;
2372
2373 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2374 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2375 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2376 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
63825f3a 2377 if (hw_support_mmap(substream)) {
1da177e4
LT		 2378 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2379 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2380 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2381 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2382 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2383 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2384 }
2385 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
7eaa943c
TI		 2386 if (err < 0)
2387 return err;
1da177e4
LT		 2388
2389 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
7eaa943c
TI		 2390 if (err < 0)
2391 return err;
1da177e4
LT		 2392
2393 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
7eaa943c
TI		 2394 if (err < 0)
2395 return err;
1da177e4
LT		 2396
2397 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2398 hw->channels_min, hw->channels_max);
7eaa943c
TI		 2399 if (err < 0)
2400 return err;
1da177e4
LT		 2401
2402 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2403 hw->rate_min, hw->rate_max);
8b90ca08
GL		 2404 if (err < 0)
2405 return err;
1da177e4
LT		 2406
2407 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2408 hw->period_bytes_min, hw->period_bytes_max);
8b90ca08
GL		 2409 if (err < 0)
2410 return err;
1da177e4
LT		 2411
2412 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2413 hw->periods_min, hw->periods_max);
7eaa943c
TI		 2414 if (err < 0)
2415 return err;
1da177e4
LT		 2416
2417 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2418 hw->period_bytes_min, hw->buffer_bytes_max);
7eaa943c
TI		 2419 if (err < 0)
2420 return err;
1da177e4
LT		 2421
2422 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2423 snd_pcm_hw_rule_buffer_bytes_max, substream,
2424 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2425 if (err < 0)
2426 return err;
2427
2428 /* FIXME: remove */
2429 if (runtime->dma_bytes) {
2430 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
7eaa943c 2431 if (err < 0)
6cf95152 2432 return err;
1da177e4
LT		 2433 }
2434
2435 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2436 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2437 snd_pcm_hw_rule_rate, hw,
2438 SNDRV_PCM_HW_PARAM_RATE, -1);
2439 if (err < 0)
2440 return err;
2441 }
2442
2443 /* FIXME: this belong to lowlevel */
1da177e4
LT		 2444 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2445
2446 return 0;
2447}
2448
3bf75f9b 2449static void pcm_release_private(struct snd_pcm_substream *substream)
1da177e4 2450{
b51abed8
TI		 2451 if (snd_pcm_stream_linked(substream))
2452 snd_pcm_unlink(substream);
3bf75f9b
TI		 2453}
2454
2455void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2456{
0df63e44
TI		 2457 substream->ref_count--;
2458 if (substream->ref_count > 0)
2459 return;
2460
3bf75f9b 2461 snd_pcm_drop(substream);
3bf75f9b 2462 if (substream->hw_opened) {
094435d4
TI		 2463 if (substream->ops->hw_free &&
2464 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
1da177e4
LT		 2465 substream->ops->hw_free(substream);
2466 substream->ops->close(substream);
3bf75f9b 2467 substream->hw_opened = 0;
1da177e4 2468 }
8699a0b6
TI		 2469 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2470 pm_qos_remove_request(&substream->latency_pm_qos_req);
1576274d
TI		 2471 if (substream->pcm_release) {
2472 substream->pcm_release(substream);
2473 substream->pcm_release = NULL;
2474 }
3bf75f9b
TI		 2475 snd_pcm_detach_substream(substream);
2476}
e88e8ae6
TI		 2477EXPORT_SYMBOL(snd_pcm_release_substream);
2478
3bf75f9b
TI		 2479int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2480 struct file *file,
2481 struct snd_pcm_substream **rsubstream)
2482{
2483 struct snd_pcm_substream *substream;
2484 int err;
2485
2486 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2487 if (err < 0)
2488 return err;
0df63e44
TI		 2489 if (substream->ref_count > 1) {
2490 *rsubstream = substream;
2491 return 0;
2492 }
2493
3bf75f9b
TI		 2494 err = snd_pcm_hw_constraints_init(substream);
2495 if (err < 0) {
09e56df8 2496 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
3bf75f9b
TI		 2497 goto error;
2498 }
2499
2500 if ((err = substream->ops->open(substream)) < 0)
2501 goto error;
2502
2503 substream->hw_opened = 1;
2504
2505 err = snd_pcm_hw_constraints_complete(substream);
2506 if (err < 0) {
09e56df8 2507 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
3bf75f9b
TI		 2508 goto error;
2509 }
2510
2511 *rsubstream = substream;
1da177e4 2512 return 0;
3bf75f9b
TI		 2513
2514 error:
2515 snd_pcm_release_substream(substream);
2516 return err;
1da177e4 2517}
e88e8ae6
TI		 2518EXPORT_SYMBOL(snd_pcm_open_substream);
2519
1da177e4 2520static int snd_pcm_open_file(struct file *file,
877211f5 2521 struct snd_pcm *pcm,
ffd3d5c6 2522 int stream)
1da177e4 2523{
877211f5
TI		 2524 struct snd_pcm_file *pcm_file;
2525 struct snd_pcm_substream *substream;
3bf75f9b 2526 int err;
1da177e4 2527
3bf75f9b
TI		 2528 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2529 if (err < 0)
2530 return err;
2531
548a648b
TI		 2532 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2533 if (pcm_file == NULL) {
2534 snd_pcm_release_substream(substream);
2535 return -ENOMEM;
2536 }
2537 pcm_file->substream = substream;
de89750c 2538 if (substream->ref_count == 1)
0df63e44 2539 substream->pcm_release = pcm_release_private;
1da177e4 2540 file->private_data = pcm_file;
ffd3d5c6 2541
1da177e4
LT		 2542 return 0;
2543}
2544
f87135f5
CL		 2545static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2546{
2547 struct snd_pcm *pcm;
02f4865f
TI		 2548 int err = nonseekable_open(inode, file);
2549 if (err < 0)
2550 return err;
f87135f5
CL		 2551 pcm = snd_lookup_minor_data(iminor(inode),
2552 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
a0830dbd 2553 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
8bb4d9ce
TI		 2554 if (pcm)
2555 snd_card_unref(pcm->card);
a0830dbd 2556 return err;
f87135f5
CL		 2557}
2558
2559static int snd_pcm_capture_open(struct inode *inode, struct file *file)
1da177e4 2560{
877211f5 2561 struct snd_pcm *pcm;
02f4865f
TI		 2562 int err = nonseekable_open(inode, file);
2563 if (err < 0)
2564 return err;
f87135f5
CL		 2565 pcm = snd_lookup_minor_data(iminor(inode),
2566 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
a0830dbd 2567 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
8bb4d9ce
TI		 2568 if (pcm)
2569 snd_card_unref(pcm->card);
a0830dbd 2570 return err;
f87135f5
CL		 2571}
2572
2573static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2574{
2575 int err;
ac6424b9 2576 wait_queue_entry_t wait;
1da177e4 2577
1da177e4
LT		 2578 if (pcm == NULL) {
2579 err = -ENODEV;
2580 goto __error1;
2581 }
2582 err = snd_card_file_add(pcm->card, file);
2583 if (err < 0)
2584 goto __error1;
2585 if (!try_module_get(pcm->card->module)) {
2586 err = -EFAULT;
2587 goto __error2;
2588 }
2589 init_waitqueue_entry(&wait, current);
2590 add_wait_queue(&pcm->open_wait, &wait);
1a60d4c5 2591 mutex_lock(&pcm->open_mutex);
1da177e4 2592 while (1) {
ffd3d5c6 2593 err = snd_pcm_open_file(file, pcm, stream);
1da177e4
LT		 2594 if (err >= 0)
2595 break;
2596 if (err == -EAGAIN) {
2597 if (file->f_flags & O_NONBLOCK) {
2598 err = -EBUSY;
2599 break;
2600 }
2601 } else
2602 break;
2603 set_current_state(TASK_INTERRUPTIBLE);
1a60d4c5 2604 mutex_unlock(&pcm->open_mutex);
1da177e4 2605 schedule();
1a60d4c5 2606 mutex_lock(&pcm->open_mutex);
0914f796
TI		 2607 if (pcm->card->shutdown) {
2608 err = -ENODEV;
2609 break;
2610 }
1da177e4
LT		 2611 if (signal_pending(current)) {
2612 err = -ERESTARTSYS;
2613 break;
2614 }
2615 }
2616 remove_wait_queue(&pcm->open_wait, &wait);
1a60d4c5 2617 mutex_unlock(&pcm->open_mutex);
1da177e4
LT		 2618 if (err < 0)
2619 goto __error;
2620 return err;
2621
2622 __error:
2623 module_put(pcm->card->module);
2624 __error2:
2625 snd_card_file_remove(pcm->card, file);
2626 __error1:
2627 return err;
2628}
2629
2630static int snd_pcm_release(struct inode *inode, struct file *file)
2631{
877211f5
TI		 2632 struct snd_pcm *pcm;
2633 struct snd_pcm_substream *substream;
2634 struct snd_pcm_file *pcm_file;
1da177e4
LT		 2635
2636 pcm_file = file->private_data;
2637 substream = pcm_file->substream;
7eaa943c
TI		 2638 if (snd_BUG_ON(!substream))
2639 return -ENXIO;
1da177e4 2640 pcm = substream->pcm;
1a60d4c5 2641 mutex_lock(&pcm->open_mutex);
3bf75f9b 2642 snd_pcm_release_substream(substream);
548a648b 2643 kfree(pcm_file);
1a60d4c5 2644 mutex_unlock(&pcm->open_mutex);
1da177e4
LT		 2645 wake_up(&pcm->open_wait);
2646 module_put(pcm->card->module);
2647 snd_card_file_remove(pcm->card, file);
2648 return 0;
2649}
2650
f839cc1c
TI		 2651/* check and update PCM state; return 0 or a negative error
2652 * call this inside PCM lock
2653 */
2654static int do_pcm_hwsync(struct snd_pcm_substream *substream)
1da177e4 2655{
f839cc1c 2656 switch (substream->runtime->status->state) {
1da177e4 2657 case SNDRV_PCM_STATE_DRAINING:
f839cc1c
TI		 2658 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2659 return -EBADFD;
1da177e4 2660 /* Fall through */
f839cc1c
TI		 2661 case SNDRV_PCM_STATE_RUNNING:
2662 return snd_pcm_update_hw_ptr(substream);
2663 case SNDRV_PCM_STATE_PREPARED:
2664 case SNDRV_PCM_STATE_PAUSED:
2665 return 0;
51840409 2666 case SNDRV_PCM_STATE_SUSPENDED:
f839cc1c
TI		 2667 return -ESTRPIPE;
2668 case SNDRV_PCM_STATE_XRUN:
2669 return -EPIPE;
1da177e4 2670 default:
f839cc1c 2671 return -EBADFD;
1da177e4 2672 }
f839cc1c 2673}
1da177e4 2674
9027c463 2675/* increase the appl_ptr; returns the processed frames or a negative error */
e0327a0f
TI		 2676static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2677 snd_pcm_uframes_t frames,
2678 snd_pcm_sframes_t avail)
2679{
2680 struct snd_pcm_runtime *runtime = substream->runtime;
2681 snd_pcm_sframes_t appl_ptr;
9027c463 2682 int ret;
e0327a0f
TI		 2683
2684 if (avail <= 0)
2685 return 0;
2686 if (frames > (snd_pcm_uframes_t)avail)
2687 frames = avail;
2688 appl_ptr = runtime->control->appl_ptr + frames;
2689 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2690 appl_ptr -= runtime->boundary;
66e01a5c 2691 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
9027c463 2692 return ret < 0 ? ret : frames;
e0327a0f
TI		 2693}
2694
fb51f1cd 2695/* decrease the appl_ptr; returns the processed frames or zero for error */
e0327a0f
TI		 2696static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2697 snd_pcm_uframes_t frames,
2698 snd_pcm_sframes_t avail)
2699{
2700 struct snd_pcm_runtime *runtime = substream->runtime;
2701 snd_pcm_sframes_t appl_ptr;
9027c463 2702 int ret;
e0327a0f
TI		 2703
2704 if (avail <= 0)
2705 return 0;
2706 if (frames > (snd_pcm_uframes_t)avail)
2707 frames = avail;
1da177e4
LT		 2708 appl_ptr = runtime->control->appl_ptr - frames;
2709 if (appl_ptr < 0)
2710 appl_ptr += runtime->boundary;
66e01a5c 2711 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
fb51f1cd
TI		 2712 /* NOTE: we return zero for errors because PulseAudio gets depressed
2713 * upon receiving an error from rewind ioctl and stops processing
2714 * any longer. Returning zero means that no rewind is done, so
2715 * it's not absolutely wrong to answer like that.
2716 */
2717 return ret < 0 ? 0 : frames;
e0327a0f
TI		 2718}
2719
763e5067
TI		 2720static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2721 snd_pcm_uframes_t frames)
1da177e4 2722{
1da177e4 2723 snd_pcm_sframes_t ret;
1da177e4
LT		 2724
2725 if (frames == 0)
2726 return 0;
2727
2728 snd_pcm_stream_lock_irq(substream);
f839cc1c 2729 ret = do_pcm_hwsync(substream);
e0327a0f
TI		 2730 if (!ret)
2731 ret = rewind_appl_ptr(substream, frames,
763e5067 2732 snd_pcm_hw_avail(substream));
1da177e4
LT		 2733 snd_pcm_stream_unlock_irq(substream);
2734 return ret;
2735}
2736
763e5067
TI		 2737static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2738 snd_pcm_uframes_t frames)
1da177e4 2739{
1da177e4 2740 snd_pcm_sframes_t ret;
1da177e4
LT		 2741
2742 if (frames == 0)
2743 return 0;
2744
2745 snd_pcm_stream_lock_irq(substream);
f839cc1c 2746 ret = do_pcm_hwsync(substream);
e0327a0f
TI		 2747 if (!ret)
2748 ret = forward_appl_ptr(substream, frames,
763e5067 2749 snd_pcm_avail(substream));
1da177e4
LT		 2750 snd_pcm_stream_unlock_irq(substream);
2751 return ret;
2752}
2753
877211f5 2754static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
1da177e4 2755{
1da177e4
LT		 2756 int err;
2757
2758 snd_pcm_stream_lock_irq(substream);
f839cc1c 2759 err = do_pcm_hwsync(substream);
1da177e4
LT		 2760 snd_pcm_stream_unlock_irq(substream);
2761 return err;
2762}
2763
912e4c33
JM		 2764static int snd_pcm_delay(struct snd_pcm_substream *substream,
2765 snd_pcm_sframes_t *delay)
1da177e4 2766{
1da177e4
LT		 2767 int err;
2768 snd_pcm_sframes_t n = 0;
2769
2770 snd_pcm_stream_lock_irq(substream);
f839cc1c 2771 err = do_pcm_hwsync(substream);
c99c5a3b
TI		 2772 if (!err)
2773 n = snd_pcm_calc_delay(substream);
1da177e4 2774 snd_pcm_stream_unlock_irq(substream);
912e4c33
JM		 2775 if (!err)
2776 *delay = n;
2777 return err;
1da177e4
LT		 2778}
2779
877211f5
TI		 2780static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2781 struct snd_pcm_sync_ptr __user *_sync_ptr)
1da177e4 2782{
877211f5
TI		 2783 struct snd_pcm_runtime *runtime = substream->runtime;
2784 struct snd_pcm_sync_ptr sync_ptr;
2785 volatile struct snd_pcm_mmap_status *status;
2786 volatile struct snd_pcm_mmap_control *control;
1da177e4
LT		 2787 int err;
2788
2789 memset(&sync_ptr, 0, sizeof(sync_ptr));
2790 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2791 return -EFAULT;
877211f5 2792 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
1da177e4
LT		 2793 return -EFAULT;
2794 status = runtime->status;
2795 control = runtime->control;
2796 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2797 err = snd_pcm_hwsync(substream);
2798 if (err < 0)
2799 return err;
2800 }
2801 snd_pcm_stream_lock_irq(substream);
9027c463 2802 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
66e01a5c
TS		 2803 err = pcm_lib_apply_appl_ptr(substream,
2804 sync_ptr.c.control.appl_ptr);
9027c463
TI		 2805 if (err < 0) {
2806 snd_pcm_stream_unlock_irq(substream);
2807 return err;
2808 }
2809 } else {
1da177e4 2810 sync_ptr.c.control.appl_ptr = control->appl_ptr;
9027c463 2811 }
1da177e4
LT		 2812 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2813 control->avail_min = sync_ptr.c.control.avail_min;
2814 else
2815 sync_ptr.c.control.avail_min = control->avail_min;
2816 sync_ptr.s.status.state = status->state;
2817 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2818 sync_ptr.s.status.tstamp = status->tstamp;
2819 sync_ptr.s.status.suspended_state = status->suspended_state;
f853dcaa 2820 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
1da177e4
LT		 2821 snd_pcm_stream_unlock_irq(substream);
2822 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2823 return -EFAULT;
2824 return 0;
2825}
b751eef1
JK		 2826
2827static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2828{
2829 struct snd_pcm_runtime *runtime = substream->runtime;
2830 int arg;
2831
2832 if (get_user(arg, _arg))
2833 return -EFAULT;
2834 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2835 return -EINVAL;
2408c219 2836 runtime->tstamp_type = arg;
b751eef1
JK		 2837 return 0;
2838}
67616fed
TI		 2839
2840static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2841 struct snd_xferi __user *_xferi)
2842{
2843 struct snd_xferi xferi;
2844 struct snd_pcm_runtime *runtime = substream->runtime;
2845 snd_pcm_sframes_t result;
2846
2847 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2848 return -EBADFD;
2849 if (put_user(0, &_xferi->result))
2850 return -EFAULT;
2851 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2852 return -EFAULT;
2853 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2854 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2855 else
2856 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2857 __put_user(result, &_xferi->result);
2858 return result < 0 ? result : 0;
2859}
2860
2861static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2862 struct snd_xfern __user *_xfern)
2863{
2864 struct snd_xfern xfern;
2865 struct snd_pcm_runtime *runtime = substream->runtime;
2866 void *bufs;
2867 snd_pcm_sframes_t result;
2868
2869 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2870 return -EBADFD;
2871 if (runtime->channels > 128)
2872 return -EINVAL;
2873 if (put_user(0, &_xfern->result))
2874 return -EFAULT;
2875 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2876 return -EFAULT;
2877
2878 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2879 if (IS_ERR(bufs))
2880 return PTR_ERR(bufs);
2881 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2882 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2883 else
2884 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2885 kfree(bufs);
2886 __put_user(result, &_xfern->result);
2887 return result < 0 ? result : 0;
2888}
2889
2890static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2891 snd_pcm_uframes_t __user *_frames)
2892{
2893 snd_pcm_uframes_t frames;
2894 snd_pcm_sframes_t result;
2895
2896 if (get_user(frames, _frames))
2897 return -EFAULT;
2898 if (put_user(0, _frames))
2899 return -EFAULT;
763e5067 2900 result = snd_pcm_rewind(substream, frames);
67616fed
TI		 2901 __put_user(result, _frames);
2902 return result < 0 ? result : 0;
2903}
2904
2905static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2906 snd_pcm_uframes_t __user *_frames)
2907{
2908 snd_pcm_uframes_t frames;
2909 snd_pcm_sframes_t result;
2910
2911 if (get_user(frames, _frames))
2912 return -EFAULT;
2913 if (put_user(0, _frames))
2914 return -EFAULT;
763e5067 2915 result = snd_pcm_forward(substream, frames);
67616fed
TI		 2916 __put_user(result, _frames);
2917 return result < 0 ? result : 0;
2918}
2919
2920static int snd_pcm_common_ioctl(struct file *file,
0df63e44 2921 struct snd_pcm_substream *substream,
1da177e4
LT		 2922 unsigned int cmd, void __user *arg)
2923{
4b671f57 2924 struct snd_pcm_file *pcm_file = file->private_data;
7d8e8292
TI		 2925 int res;
2926
67616fed
TI		 2927 if (PCM_RUNTIME_CHECK(substream))
2928 return -ENXIO;
2929
7d8e8292
TI		 2930 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2931 if (res < 0)
2932 return res;
4b671f57 2933
1da177e4
LT		 2934 switch (cmd) {
2935 case SNDRV_PCM_IOCTL_PVERSION:
2936 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2937 case SNDRV_PCM_IOCTL_INFO:
2938 return snd_pcm_info_user(substream, arg);
28e9e473
JK		 2939 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2940 return 0;
b751eef1
JK		 2941 case SNDRV_PCM_IOCTL_TTSTAMP:
2942 return snd_pcm_tstamp(substream, arg);
4b671f57
TI		 2943 case SNDRV_PCM_IOCTL_USER_PVERSION:
2944 if (get_user(pcm_file->user_pversion,
2945 (unsigned int __user *)arg))
2946 return -EFAULT;
2947 return 0;
1da177e4
LT		 2948 case SNDRV_PCM_IOCTL_HW_REFINE:
2949 return snd_pcm_hw_refine_user(substream, arg);
2950 case SNDRV_PCM_IOCTL_HW_PARAMS:
2951 return snd_pcm_hw_params_user(substream, arg);
2952 case SNDRV_PCM_IOCTL_HW_FREE:
2953 return snd_pcm_hw_free(substream);
2954 case SNDRV_PCM_IOCTL_SW_PARAMS:
2955 return snd_pcm_sw_params_user(substream, arg);
2956 case SNDRV_PCM_IOCTL_STATUS:
38ca2a4d
PLB		 2957 return snd_pcm_status_user(substream, arg, false);
2958 case SNDRV_PCM_IOCTL_STATUS_EXT:
2959 return snd_pcm_status_user(substream, arg, true);
1da177e4
LT		 2960 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2961 return snd_pcm_channel_info_user(substream, arg);
2962 case SNDRV_PCM_IOCTL_PREPARE:
0df63e44 2963 return snd_pcm_prepare(substream, file);
1da177e4
LT		 2964 case SNDRV_PCM_IOCTL_RESET:
2965 return snd_pcm_reset(substream);
2966 case SNDRV_PCM_IOCTL_START:
c2c86a97 2967 return snd_pcm_start_lock_irq(substream);
1da177e4
LT		 2968 case SNDRV_PCM_IOCTL_LINK:
2969 return snd_pcm_link(substream, (int)(unsigned long) arg);
2970 case SNDRV_PCM_IOCTL_UNLINK:
2971 return snd_pcm_unlink(substream);
2972 case SNDRV_PCM_IOCTL_RESUME:
2973 return snd_pcm_resume(substream);
2974 case SNDRV_PCM_IOCTL_XRUN:
2975 return snd_pcm_xrun(substream);
2976 case SNDRV_PCM_IOCTL_HWSYNC:
2977 return snd_pcm_hwsync(substream);
2978 case SNDRV_PCM_IOCTL_DELAY:
c2c86a97 2979 {
912e4c33 2980 snd_pcm_sframes_t delay;
c2c86a97 2981 snd_pcm_sframes_t __user *res = arg;
912e4c33 2982 int err;
c2c86a97 2983
912e4c33
JM		 2984 err = snd_pcm_delay(substream, &delay);
2985 if (err)
2986 return err;
c2c86a97
TI		 2987 if (put_user(delay, res))
2988 return -EFAULT;
2989 return 0;
2990 }
1da177e4
LT		 2991 case SNDRV_PCM_IOCTL_SYNC_PTR:
2992 return snd_pcm_sync_ptr(substream, arg);
59d48582 2993#ifdef CONFIG_SND_SUPPORT_OLD_API
1da177e4
LT		 2994 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2995 return snd_pcm_hw_refine_old_user(substream, arg);
2996 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2997 return snd_pcm_hw_params_old_user(substream, arg);
59d48582 2998#endif
1da177e4 2999 case SNDRV_PCM_IOCTL_DRAIN:
4cdc115f 3000 return snd_pcm_drain(substream, file);
1da177e4
LT		 3001 case SNDRV_PCM_IOCTL_DROP:
3002 return snd_pcm_drop(substream);
e661d0dd 3003 case SNDRV_PCM_IOCTL_PAUSE:
34bcc44a
TI		 3004 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
3005 substream,
3006 (int)(unsigned long)arg);
1da177e4 3007 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
1da177e4 3008 case SNDRV_PCM_IOCTL_READI_FRAMES:
67616fed
TI		 3009 return snd_pcm_xferi_frames_ioctl(substream, arg);
3010 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
1da177e4 3011 case SNDRV_PCM_IOCTL_READN_FRAMES:
67616fed 3012 return snd_pcm_xfern_frames_ioctl(substream, arg);
1da177e4 3013 case SNDRV_PCM_IOCTL_REWIND:
67616fed 3014 return snd_pcm_rewind_ioctl(substream, arg);
1da177e4 3015 case SNDRV_PCM_IOCTL_FORWARD:
67616fed 3016 return snd_pcm_forward_ioctl(substream, arg);
1da177e4 3017 }
67616fed
TI		 3018 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3019 return -ENOTTY;
1da177e4
LT		 3020}
3021
67616fed
TI		 3022static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3023 unsigned long arg)
1da177e4 3024{
877211f5 3025 struct snd_pcm_file *pcm_file;
1da177e4
LT		 3026
3027 pcm_file = file->private_data;
3028
3029 if (((cmd >> 8) & 0xff) != 'A')
3030 return -ENOTTY;
3031
67616fed
TI		 3032 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3033 (void __user *)arg);
1da177e4
LT		 3034}
3035
c2c86a97
TI		 3036/**
3037 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3038 * @substream: PCM substream
3039 * @cmd: IOCTL cmd
3040 * @arg: IOCTL argument
3041 *
3042 * The function is provided primarily for OSS layer and USB gadget drivers,
3043 * and it allows only the limited set of ioctls (hw_params, sw_params,
3044 * prepare, start, drain, drop, forward).
3045 */
bf1bbb5a
TI		 3046int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3047 unsigned int cmd, void *arg)
1da177e4 3048{
c2c86a97
TI		 3049 snd_pcm_uframes_t *frames = arg;
3050 snd_pcm_sframes_t result;
1da177e4 3051
c2c86a97
TI		 3052 switch (cmd) {
3053 case SNDRV_PCM_IOCTL_FORWARD:
3054 {
3055 /* provided only for OSS; capture-only and no value returned */
3056 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3057 return -EINVAL;
763e5067 3058 result = snd_pcm_forward(substream, *frames);
c2c86a97
TI		 3059 return result < 0 ? result : 0;
3060 }
3061 case SNDRV_PCM_IOCTL_HW_PARAMS:
3062 return snd_pcm_hw_params(substream, arg);
3063 case SNDRV_PCM_IOCTL_SW_PARAMS:
3064 return snd_pcm_sw_params(substream, arg);
3065 case SNDRV_PCM_IOCTL_PREPARE:
3066 return snd_pcm_prepare(substream, NULL);
3067 case SNDRV_PCM_IOCTL_START:
3068 return snd_pcm_start_lock_irq(substream);
3069 case SNDRV_PCM_IOCTL_DRAIN:
7d8e8292 3070 return snd_pcm_drain(substream, NULL);
c2c86a97
TI		 3071 case SNDRV_PCM_IOCTL_DROP:
3072 return snd_pcm_drop(substream);
3073 case SNDRV_PCM_IOCTL_DELAY:
912e4c33 3074 return snd_pcm_delay(substream, frames);
1da177e4 3075 default:
c2c86a97 3076 return -EINVAL;
1da177e4
LT		 3077 }
3078}
e88e8ae6
TI		 3079EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3080
877211f5
TI		 3081static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3082 loff_t * offset)
1da177e4 3083{
877211f5
TI		 3084 struct snd_pcm_file *pcm_file;
3085 struct snd_pcm_substream *substream;
3086 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3087 snd_pcm_sframes_t result;
3088
3089 pcm_file = file->private_data;
3090 substream = pcm_file->substream;
7eaa943c
TI		 3091 if (PCM_RUNTIME_CHECK(substream))
3092 return -ENXIO;
1da177e4
LT		 3093 runtime = substream->runtime;
3094 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3095 return -EBADFD;
3096 if (!frame_aligned(runtime, count))
3097 return -EINVAL;
3098 count = bytes_to_frames(runtime, count);
3099 result = snd_pcm_lib_read(substream, buf, count);
3100 if (result > 0)
3101 result = frames_to_bytes(runtime, result);
3102 return result;
3103}
3104
877211f5
TI		 3105static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3106 size_t count, loff_t * offset)
1da177e4 3107{
877211f5
TI		 3108 struct snd_pcm_file *pcm_file;
3109 struct snd_pcm_substream *substream;
3110 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3111 snd_pcm_sframes_t result;
3112
3113 pcm_file = file->private_data;
3114 substream = pcm_file->substream;
7eaa943c
TI		 3115 if (PCM_RUNTIME_CHECK(substream))
3116 return -ENXIO;
1da177e4 3117 runtime = substream->runtime;
7eaa943c
TI		 3118 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3119 return -EBADFD;
3120 if (!frame_aligned(runtime, count))
3121 return -EINVAL;
1da177e4
LT		 3122 count = bytes_to_frames(runtime, count);
3123 result = snd_pcm_lib_write(substream, buf, count);
3124 if (result > 0)
3125 result = frames_to_bytes(runtime, result);
1da177e4
LT		 3126 return result;
3127}
3128
1c65d986 3129static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
1da177e4 3130{
877211f5
TI		 3131 struct snd_pcm_file *pcm_file;
3132 struct snd_pcm_substream *substream;
3133 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3134 snd_pcm_sframes_t result;
3135 unsigned long i;
3136 void __user **bufs;
3137 snd_pcm_uframes_t frames;
3138
ee0b3e67 3139 pcm_file = iocb->ki_filp->private_data;
1da177e4 3140 substream = pcm_file->substream;
7eaa943c
TI		 3141 if (PCM_RUNTIME_CHECK(substream))
3142 return -ENXIO;
1da177e4
LT		 3143 runtime = substream->runtime;
3144 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3145 return -EBADFD;
1c65d986
AV		 3146 if (!iter_is_iovec(to))
3147 return -EINVAL;
3148 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
1da177e4 3149 return -EINVAL;
1c65d986 3150 if (!frame_aligned(runtime, to->iov->iov_len))
1da177e4 3151 return -EINVAL;
1c65d986 3152 frames = bytes_to_samples(runtime, to->iov->iov_len);
6da2ec56 3153 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
1da177e4
LT		 3154 if (bufs == NULL)
3155 return -ENOMEM;
1c65d986
AV		 3156 for (i = 0; i < to->nr_segs; ++i)
3157 bufs[i] = to->iov[i].iov_base;
1da177e4
LT		 3158 result = snd_pcm_lib_readv(substream, bufs, frames);
3159 if (result > 0)
3160 result = frames_to_bytes(runtime, result);
3161 kfree(bufs);
3162 return result;
3163}
3164
1c65d986 3165static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
1da177e4 3166{
877211f5
TI		 3167 struct snd_pcm_file *pcm_file;
3168 struct snd_pcm_substream *substream;
3169 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3170 snd_pcm_sframes_t result;
3171 unsigned long i;
3172 void __user **bufs;
3173 snd_pcm_uframes_t frames;
3174
ee0b3e67 3175 pcm_file = iocb->ki_filp->private_data;
1da177e4 3176 substream = pcm_file->substream;
7eaa943c
TI		 3177 if (PCM_RUNTIME_CHECK(substream))
3178 return -ENXIO;
1da177e4 3179 runtime = substream->runtime;
7eaa943c
TI		 3180 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3181 return -EBADFD;
1c65d986
AV		 3182 if (!iter_is_iovec(from))
3183 return -EINVAL;
3184 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3185 !frame_aligned(runtime, from->iov->iov_len))
7eaa943c 3186 return -EINVAL;
1c65d986 3187 frames = bytes_to_samples(runtime, from->iov->iov_len);
6da2ec56 3188 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
1da177e4
LT		 3189 if (bufs == NULL)
3190 return -ENOMEM;
1c65d986
AV		 3191 for (i = 0; i < from->nr_segs; ++i)
3192 bufs[i] = from->iov[i].iov_base;
1da177e4
LT		 3193 result = snd_pcm_lib_writev(substream, bufs, frames);
3194 if (result > 0)
3195 result = frames_to_bytes(runtime, result);
3196 kfree(bufs);
1da177e4
LT		 3197 return result;
3198}
3199
6448fcba 3200static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
1da177e4 3201{
877211f5
TI		 3202 struct snd_pcm_file *pcm_file;
3203 struct snd_pcm_substream *substream;
3204 struct snd_pcm_runtime *runtime;
6448fcba 3205 __poll_t mask, ok;
1da177e4
LT		 3206 snd_pcm_uframes_t avail;
3207
3208 pcm_file = file->private_data;
3209
3210 substream = pcm_file->substream;
6448fcba
TI		 3211 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3212 ok = EPOLLOUT | EPOLLWRNORM;
3213 else
3214 ok = EPOLLIN | EPOLLRDNORM;
7eaa943c 3215 if (PCM_RUNTIME_CHECK(substream))
6448fcba 3216 return ok | EPOLLERR;
1da177e4 3217
1da177e4 3218 runtime = substream->runtime;
1da177e4
LT		 3219 poll_wait(file, &runtime->sleep, wait);
3220
6448fcba 3221 mask = 0;
1da177e4 3222 snd_pcm_stream_lock_irq(substream);
6448fcba 3223 avail = snd_pcm_avail(substream);
1da177e4
LT		 3224 switch (runtime->status->state) {
3225 case SNDRV_PCM_STATE_RUNNING:
3226 case SNDRV_PCM_STATE_PREPARED:
3227 case SNDRV_PCM_STATE_PAUSED:
6448fcba
TI		 3228 if (avail >= runtime->control->avail_min)
3229 mask = ok;
1da177e4
LT		 3230 break;
3231 case SNDRV_PCM_STATE_DRAINING:
6448fcba
TI		 3232 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3233 mask = ok;
3234 if (!avail)
3235 mask |= EPOLLERR;
1da177e4 3236 }
6448fcba 3237 break;
1da177e4 3238 default:
6448fcba 3239 mask = ok | EPOLLERR;
1da177e4
LT		 3240 break;
3241 }
3242 snd_pcm_stream_unlock_irq(substream);
3243 return mask;
3244}
3245
3246/*
3247 * mmap support
3248 */
3249
3250/*
3251 * Only on coherent architectures, we can mmap the status and the control records
3252 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3253 */
3254#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3255/*
3256 * mmap status record
3257 */
41412fe9 3258static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
1da177e4 3259{
11bac800 3260 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
877211f5 3261 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3262
3263 if (substream == NULL)
3ad5afcd 3264 return VM_FAULT_SIGBUS;
1da177e4 3265 runtime = substream->runtime;
3ad5afcd
NP		 3266 vmf->page = virt_to_page(runtime->status);
3267 get_page(vmf->page);
3268 return 0;
1da177e4
LT		 3269}
3270
f0f37e2f 3271static const struct vm_operations_struct snd_pcm_vm_ops_status =
1da177e4 3272{
3ad5afcd 3273 .fault = snd_pcm_mmap_status_fault,
1da177e4
LT		 3274};
3275
877211f5 3276static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3277 struct vm_area_struct *area)
3278{
1da177e4
LT		 3279 long size;
3280 if (!(area->vm_flags & VM_READ))
3281 return -EINVAL;
1da177e4 3282 size = area->vm_end - area->vm_start;
877211f5 3283 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
1da177e4
LT		 3284 return -EINVAL;
3285 area->vm_ops = &snd_pcm_vm_ops_status;
3286 area->vm_private_data = substream;
314e51b9 3287 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 3288 return 0;
3289}
3290
3291/*
3292 * mmap control record
3293 */
41412fe9 3294static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
1da177e4 3295{
11bac800 3296 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
877211f5 3297 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3298
3299 if (substream == NULL)
3ad5afcd 3300 return VM_FAULT_SIGBUS;
1da177e4 3301 runtime = substream->runtime;
3ad5afcd
NP		 3302 vmf->page = virt_to_page(runtime->control);
3303 get_page(vmf->page);
3304 return 0;
1da177e4
LT		 3305}
3306
f0f37e2f 3307static const struct vm_operations_struct snd_pcm_vm_ops_control =
1da177e4 3308{
3ad5afcd 3309 .fault = snd_pcm_mmap_control_fault,
1da177e4
LT		 3310};
3311
877211f5 3312static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3313 struct vm_area_struct *area)
3314{
1da177e4
LT		 3315 long size;
3316 if (!(area->vm_flags & VM_READ))
3317 return -EINVAL;
1da177e4 3318 size = area->vm_end - area->vm_start;
877211f5 3319 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
1da177e4
LT		 3320 return -EINVAL;
3321 area->vm_ops = &snd_pcm_vm_ops_control;
3322 area->vm_private_data = substream;
314e51b9 3323 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 3324 return 0;
3325}
42f94597
TI		 3326
3327static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3328{
3329 if (pcm_file->no_compat_mmap)
3330 return false;
b602aa8e
TI		 3331 /* See pcm_control_mmap_allowed() below.
3332 * Since older alsa-lib requires both status and control mmaps to be
3333 * coupled, we have to disable the status mmap for old alsa-lib, too.
3334 */
3335 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3336 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3337 return false;
3338 return true;
3339}
3340
3341static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3342{
3343 if (pcm_file->no_compat_mmap)
3344 return false;
3345 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
42f94597
TI		 3346 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3347 * thus it effectively assures the manual update of appl_ptr.
42f94597
TI		 3348 */
3349 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3350 return false;
3351 return true;
3352}
3353
1da177e4
LT		 3354#else /* ! coherent mmap */
3355/*
3356 * don't support mmap for status and control records.
3357 */
42f94597 3358#define pcm_status_mmap_allowed(pcm_file) false
b602aa8e 3359#define pcm_control_mmap_allowed(pcm_file) false
42f94597 3360
877211f5 3361static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3362 struct vm_area_struct *area)
3363{
3364 return -ENXIO;
3365}
877211f5 3366static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3367 struct vm_area_struct *area)
3368{
3369 return -ENXIO;
3370}
3371#endif /* coherent mmap */
3372
9eb4a067
TI		 3373static inline struct page *
3374snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3375{
3376 void *vaddr = substream->runtime->dma_area + ofs;
7e8edae3
TI		 3377
3378 switch (substream->dma_buffer.dev.type) {
3379#ifdef CONFIG_SND_DMA_SGBUF
3380 case SNDRV_DMA_TYPE_DEV_SG:
3381 case SNDRV_DMA_TYPE_DEV_UC_SG:
3382 return snd_pcm_sgbuf_ops_page(substream, ofs);
3383#endif /* CONFIG_SND_DMA_SGBUF */
3384 case SNDRV_DMA_TYPE_VMALLOC:
3385 return vmalloc_to_page(vaddr);
3386 default:
3387 return virt_to_page(vaddr);
3388 }
9eb4a067
TI		 3389}
3390
1da177e4 3391/*
3ad5afcd 3392 * fault callback for mmapping a RAM page
1da177e4 3393 */
41412fe9 3394static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
1da177e4 3395{
11bac800 3396 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
877211f5 3397 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3398 unsigned long offset;
3399 struct page * page;
1da177e4
LT		 3400 size_t dma_bytes;
3401
3402 if (substream == NULL)
3ad5afcd 3403 return VM_FAULT_SIGBUS;
1da177e4 3404 runtime = substream->runtime;
3ad5afcd 3405 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4
LT		 3406 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3407 if (offset > dma_bytes - PAGE_SIZE)
3ad5afcd 3408 return VM_FAULT_SIGBUS;
9eb4a067 3409 if (substream->ops->page)
1da177e4 3410 page = substream->ops->page(substream, offset);
9eb4a067
TI		 3411 else
3412 page = snd_pcm_default_page_ops(substream, offset);
3413 if (!page)
3414 return VM_FAULT_SIGBUS;
b5810039 3415 get_page(page);
3ad5afcd
NP		 3416 vmf->page = page;
3417 return 0;
1da177e4
LT		 3418}
3419
657b1989
TI		 3420static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3421 .open = snd_pcm_mmap_data_open,
3422 .close = snd_pcm_mmap_data_close,
3423};
3424
3425static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
1da177e4
LT		 3426 .open = snd_pcm_mmap_data_open,
3427 .close = snd_pcm_mmap_data_close,
3ad5afcd 3428 .fault = snd_pcm_mmap_data_fault,
1da177e4
LT		 3429};
3430
3431/*
3432 * mmap the DMA buffer on RAM
3433 */
30b771cf
TI		 3434
3435/**
3436 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3437 * @substream: PCM substream
3438 * @area: VMA
3439 *
3440 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3441 * this function is invoked implicitly.
3442 */
18a2b962
TI		 3443int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3444 struct vm_area_struct *area)
1da177e4 3445{
314e51b9 3446 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
a5606f85 3447#ifdef CONFIG_GENERIC_ALLOCATOR
05503214
NC		 3448 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3449 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3450 return remap_pfn_range(area, area->vm_start,
3451 substream->dma_buffer.addr >> PAGE_SHIFT,
3452 area->vm_end - area->vm_start, area->vm_page_prot);
3453 }
a5606f85 3454#endif /* CONFIG_GENERIC_ALLOCATOR */
49d776ff 3455#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
abe594c2 3456 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
2406ff9b
TI		 3457 (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV ||
3458 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_UC))
657b1989
TI		 3459 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3460 area,
3461 substream->runtime->dma_area,
3462 substream->runtime->dma_addr,
9066ae7f 3463 substream->runtime->dma_bytes);
49d776ff 3464#endif /* CONFIG_X86 */
657b1989
TI		 3465 /* mmap with fault handler */
3466 area->vm_ops = &snd_pcm_vm_ops_data_fault;
1da177e4
LT		 3467 return 0;
3468}
18a2b962 3469EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
1da177e4
LT		 3470
3471/*
3472 * mmap the DMA buffer on I/O memory area
3473 */
3474#if SNDRV_PCM_INFO_MMAP_IOMEM
30b771cf
TI		 3475/**
3476 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3477 * @substream: PCM substream
3478 * @area: VMA
3479 *
3480 * When your hardware uses the iomapped pages as the hardware buffer and
3481 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3482 * is supposed to work only on limited architectures.
3483 */
877211f5
TI		 3484int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3485 struct vm_area_struct *area)
1da177e4 3486{
3c7f6919 3487 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 3488
1da177e4 3489 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
0fe09a45 3490 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
1da177e4 3491}
e88e8ae6 3492EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1da177e4
LT		 3493#endif /* SNDRV_PCM_INFO_MMAP */
3494
3495/*
3496 * mmap DMA buffer
3497 */
877211f5 3498int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3499 struct vm_area_struct *area)
3500{
877211f5 3501 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3502 long size;
3503 unsigned long offset;
3504 size_t dma_bytes;
657b1989 3505 int err;
1da177e4
LT		 3506
3507 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3508 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3509 return -EINVAL;
3510 } else {
3511 if (!(area->vm_flags & VM_READ))
3512 return -EINVAL;
3513 }
3514 runtime = substream->runtime;
1da177e4
LT		 3515 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3516 return -EBADFD;
3517 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3518 return -ENXIO;
3519 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3520 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3521 return -EINVAL;
3522 size = area->vm_end - area->vm_start;
3523 offset = area->vm_pgoff << PAGE_SHIFT;
3524 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3525 if ((size_t)size > dma_bytes)
3526 return -EINVAL;
3527 if (offset > dma_bytes - size)
3528 return -EINVAL;
3529
657b1989
TI		 3530 area->vm_ops = &snd_pcm_vm_ops_data;
3531 area->vm_private_data = substream;
1da177e4 3532 if (substream->ops->mmap)
657b1989 3533 err = substream->ops->mmap(substream, area);
1da177e4 3534 else
18a2b962 3535 err = snd_pcm_lib_default_mmap(substream, area);
657b1989
TI		 3536 if (!err)
3537 atomic_inc(&substream->mmap_count);
3538 return err;
1da177e4 3539}
e88e8ae6
TI		 3540EXPORT_SYMBOL(snd_pcm_mmap_data);
3541
1da177e4
LT		 3542static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3543{
877211f5
TI		 3544 struct snd_pcm_file * pcm_file;
3545 struct snd_pcm_substream *substream;
1da177e4
LT		 3546 unsigned long offset;
3547
3548 pcm_file = file->private_data;
3549 substream = pcm_file->substream;
7eaa943c
TI		 3550 if (PCM_RUNTIME_CHECK(substream))
3551 return -ENXIO;
1da177e4
LT		 3552
3553 offset = area->vm_pgoff << PAGE_SHIFT;
3554 switch (offset) {
3555 case SNDRV_PCM_MMAP_OFFSET_STATUS:
42f94597 3556 if (!pcm_status_mmap_allowed(pcm_file))
1da177e4
LT		 3557 return -ENXIO;
3558 return snd_pcm_mmap_status(substream, file, area);
3559 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
b602aa8e 3560 if (!pcm_control_mmap_allowed(pcm_file))
1da177e4
LT		 3561 return -ENXIO;
3562 return snd_pcm_mmap_control(substream, file, area);
3563 default:
3564 return snd_pcm_mmap_data(substream, file, area);
3565 }
3566 return 0;
3567}
3568
3569static int snd_pcm_fasync(int fd, struct file * file, int on)
3570{
877211f5
TI		 3571 struct snd_pcm_file * pcm_file;
3572 struct snd_pcm_substream *substream;
3573 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3574
3575 pcm_file = file->private_data;
3576 substream = pcm_file->substream;
7eaa943c 3577 if (PCM_RUNTIME_CHECK(substream))
d05468b7 3578 return -ENXIO;
1da177e4 3579 runtime = substream->runtime;
d05468b7 3580 return fasync_helper(fd, file, on, &runtime->fasync);
1da177e4
LT		 3581}
3582
3583/*
3584 * ioctl32 compat
3585 */
3586#ifdef CONFIG_COMPAT
3587#include "pcm_compat.c"
3588#else
3589#define snd_pcm_ioctl_compat NULL
3590#endif
3591
3592/*
3593 * To be removed helpers to keep binary compatibility
3594 */
3595
59d48582 3596#ifdef CONFIG_SND_SUPPORT_OLD_API
1da177e4
LT		 3597#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3598#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3599
877211f5
TI		 3600static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3601 struct snd_pcm_hw_params_old *oparams)
1da177e4
LT		 3602{
3603 unsigned int i;
3604
3605 memset(params, 0, sizeof(*params));
3606 params->flags = oparams->flags;
3607 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3608 params->masks[i].bits[0] = oparams->masks[i];
3609 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3610 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3611 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3612 params->info = oparams->info;
3613 params->msbits = oparams->msbits;
3614 params->rate_num = oparams->rate_num;
3615 params->rate_den = oparams->rate_den;
3616 params->fifo_size = oparams->fifo_size;
3617}
3618
877211f5
TI		 3619static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3620 struct snd_pcm_hw_params *params)
1da177e4
LT		 3621{
3622 unsigned int i;
3623
3624 memset(oparams, 0, sizeof(*oparams));
3625 oparams->flags = params->flags;
3626 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3627 oparams->masks[i] = params->masks[i].bits[0];
3628 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3629 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3630 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3631 oparams->info = params->info;
3632 oparams->msbits = params->msbits;
3633 oparams->rate_num = params->rate_num;
3634 oparams->rate_den = params->rate_den;
3635 oparams->fifo_size = params->fifo_size;
3636}
3637
877211f5
TI		 3638static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3639 struct snd_pcm_hw_params_old __user * _oparams)
1da177e4 3640{
877211f5
TI		 3641 struct snd_pcm_hw_params *params;
3642 struct snd_pcm_hw_params_old *oparams = NULL;
1da177e4
LT		 3643 int err;
3644
3645 params = kmalloc(sizeof(*params), GFP_KERNEL);
ef44a1ec
LZ		 3646 if (!params)
3647 return -ENOMEM;
1da177e4 3648
ef44a1ec
LZ		 3649 oparams = memdup_user(_oparams, sizeof(*oparams));
3650 if (IS_ERR(oparams)) {
3651 err = PTR_ERR(oparams);
1da177e4
LT		 3652 goto out;
3653 }
3654 snd_pcm_hw_convert_from_old_params(params, oparams);
3655 err = snd_pcm_hw_refine(substream, params);
f74ae15f
TS		 3656 if (err < 0)
3657 goto out_old;
ef44a1ec 3658
f74ae15f
TS		 3659 err = fixup_unreferenced_params(substream, params);
3660 if (err < 0)
3661 goto out_old;
ef44a1ec 3662
f74ae15f
TS		 3663 snd_pcm_hw_convert_to_old_params(oparams, params);
3664 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3665 err = -EFAULT;
3666out_old:
ef44a1ec 3667 kfree(oparams);
1da177e4
LT		 3668out:
3669 kfree(params);
1da177e4
LT		 3670 return err;
3671}
3672
877211f5
TI		 3673static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3674 struct snd_pcm_hw_params_old __user * _oparams)
1da177e4 3675{
877211f5
TI		 3676 struct snd_pcm_hw_params *params;
3677 struct snd_pcm_hw_params_old *oparams = NULL;
1da177e4
LT		 3678 int err;
3679
3680 params = kmalloc(sizeof(*params), GFP_KERNEL);
ef44a1ec
LZ		 3681 if (!params)
3682 return -ENOMEM;
3683
3684 oparams = memdup_user(_oparams, sizeof(*oparams));
3685 if (IS_ERR(oparams)) {
3686 err = PTR_ERR(oparams);
1da177e4
LT		 3687 goto out;
3688 }
f74ae15f 3689
1da177e4
LT		 3690 snd_pcm_hw_convert_from_old_params(params, oparams);
3691 err = snd_pcm_hw_params(substream, params);
f74ae15f
TS		 3692 if (err < 0)
3693 goto out_old;
ef44a1ec 3694
f74ae15f
TS		 3695 snd_pcm_hw_convert_to_old_params(oparams, params);
3696 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3697 err = -EFAULT;
3698out_old:
ef44a1ec 3699 kfree(oparams);
1da177e4
LT		 3700out:
3701 kfree(params);
1da177e4
LT		 3702 return err;
3703}
59d48582 3704#endif /* CONFIG_SND_SUPPORT_OLD_API */
1da177e4 3705
7003609b 3706#ifndef CONFIG_MMU
55c63bd2
DG		 3707static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3708 unsigned long addr,
3709 unsigned long len,
3710 unsigned long pgoff,
3711 unsigned long flags)
3712{
3713 struct snd_pcm_file *pcm_file = file->private_data;
3714 struct snd_pcm_substream *substream = pcm_file->substream;
3715 struct snd_pcm_runtime *runtime = substream->runtime;
3716 unsigned long offset = pgoff << PAGE_SHIFT;
3717
3718 switch (offset) {
3719 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3720 return (unsigned long)runtime->status;
3721 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3722 return (unsigned long)runtime->control;
3723 default:
3724 return (unsigned long)runtime->dma_area + offset;
3725 }
7003609b
CC		 3726}
3727#else
55c63bd2 3728# define snd_pcm_get_unmapped_area NULL
7003609b
CC		 3729#endif
3730
1da177e4
LT		 3731/*
3732 * Register section
3733 */
3734
9c2e08c5 3735const struct file_operations snd_pcm_f_ops[2] = {
1da177e4 3736 {
2af677fc
CL		 3737 .owner = THIS_MODULE,
3738 .write = snd_pcm_write,
1c65d986 3739 .write_iter = snd_pcm_writev,
f87135f5 3740 .open = snd_pcm_playback_open,
2af677fc 3741 .release = snd_pcm_release,
02f4865f 3742 .llseek = no_llseek,
6448fcba 3743 .poll = snd_pcm_poll,
67616fed 3744 .unlocked_ioctl = snd_pcm_ioctl,
2af677fc
CL		 3745 .compat_ioctl = snd_pcm_ioctl_compat,
3746 .mmap = snd_pcm_mmap,
3747 .fasync = snd_pcm_fasync,
55c63bd2 3748 .get_unmapped_area = snd_pcm_get_unmapped_area,
1da177e4
LT		 3749 },
3750 {
2af677fc
CL		 3751 .owner = THIS_MODULE,
3752 .read = snd_pcm_read,
1c65d986 3753 .read_iter = snd_pcm_readv,
f87135f5 3754 .open = snd_pcm_capture_open,
2af677fc 3755 .release = snd_pcm_release,
02f4865f 3756 .llseek = no_llseek,
6448fcba 3757 .poll = snd_pcm_poll,
67616fed 3758 .unlocked_ioctl = snd_pcm_ioctl,
2af677fc
CL		 3759 .compat_ioctl = snd_pcm_ioctl_compat,
3760 .mmap = snd_pcm_mmap,
3761 .fasync = snd_pcm_fasync,
55c63bd2 3762 .get_unmapped_area = snd_pcm_get_unmapped_area,
1da177e4
LT		 3763 }
3764};
Linux 6.x block layer and io_uring tree(s)