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