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