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ALSA: pcm: Apply power lock globally to common ioctls
[linux-block.git] / sound / core / pcm_native.c
CommitLineData
1da177e4
LT		 1/*
2 * Digital Audio (PCM) abstract layer
c1017a4c 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
1da177e4 22#include <linux/mm.h>
da155d5b 23#include <linux/module.h>
1da177e4
LT		 24#include <linux/file.h>
25#include <linux/slab.h>
174cd4b1 26#include <linux/sched/signal.h>
1da177e4 27#include <linux/time.h>
e8db0be1 28#include <linux/pm_qos.h>
6cbbfe1c 29#include <linux/io.h>
657b1989 30#include <linux/dma-mapping.h>
1da177e4
LT		 31#include <sound/core.h>
32#include <sound/control.h>
33#include <sound/info.h>
34#include <sound/pcm.h>
35#include <sound/pcm_params.h>
36#include <sound/timer.h>
37#include <sound/minors.h>
e2e40f2c 38#include <linux/uio.h>
1da177e4 39
2c4842d3
TS		 40#include "pcm_local.h"
41
37567c55 42#ifdef CONFIG_SND_DEBUG
be4e31da
TS		 43#define CREATE_TRACE_POINTS
44#include "pcm_param_trace.h"
37567c55
TS		 45#else
46#define trace_hw_mask_param_enabled() 0
47#define trace_hw_interval_param_enabled() 0
48#define trace_hw_mask_param(substream, type, index, prev, curr)
49#define trace_hw_interval_param(substream, type, index, prev, curr)
50#endif
be4e31da 51
1da177e4
LT		 52/*
53 * Compatibility
54 */
55
877211f5 56struct snd_pcm_hw_params_old {
1da177e4
LT		 57 unsigned int flags;
58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
59 SNDRV_PCM_HW_PARAM_ACCESS + 1];
877211f5 60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
1da177e4
LT		 61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
62 unsigned int rmask;
63 unsigned int cmask;
64 unsigned int info;
65 unsigned int msbits;
66 unsigned int rate_num;
67 unsigned int rate_den;
877211f5 68 snd_pcm_uframes_t fifo_size;
1da177e4
LT		 69 unsigned char reserved[64];
70};
71
59d48582 72#ifdef CONFIG_SND_SUPPORT_OLD_API
877211f5
TI		 73#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
74#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
1da177e4 75
877211f5
TI		 76static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
77 struct snd_pcm_hw_params_old __user * _oparams);
78static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
79 struct snd_pcm_hw_params_old __user * _oparams);
59d48582 80#endif
f87135f5 81static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
1da177e4
LT		 82
83/*
84 *
85 */
86
7af142f7
TI		 87static DEFINE_RWLOCK(snd_pcm_link_rwlock);
88static DECLARE_RWSEM(snd_pcm_link_rwsem);
1da177e4 89
67ec1072
TI		 90/* Writer in rwsem may block readers even during its waiting in queue,
91 * and this may lead to a deadlock when the code path takes read sem
92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to
94 * spin until it gets the lock.
95 */
96static inline void down_write_nonblock(struct rw_semaphore *lock)
97{
98 while (!down_write_trylock(lock))
99 cond_resched();
100}
101
30b771cf
TI		 102/**
103 * snd_pcm_stream_lock - Lock the PCM stream
104 * @substream: PCM substream
105 *
106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
107 * flag of the given substream. This also takes the global link rw lock
108 * (or rw sem), too, for avoiding the race with linked streams.
109 */
7af142f7
TI		 110void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
111{
112 if (substream->pcm->nonatomic) {
67756e31 113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
7af142f7
TI		 114 mutex_lock(&substream->self_group.mutex);
115 } else {
116 read_lock(&snd_pcm_link_rwlock);
117 spin_lock(&substream->self_group.lock);
118 }
119}
120EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
121
30b771cf
TI		 122/**
123 * snd_pcm_stream_lock - Unlock the PCM stream
124 * @substream: PCM substream
125 *
126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
127 */
7af142f7
TI		 128void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
129{
130 if (substream->pcm->nonatomic) {
131 mutex_unlock(&substream->self_group.mutex);
132 up_read(&snd_pcm_link_rwsem);
133 } else {
134 spin_unlock(&substream->self_group.lock);
135 read_unlock(&snd_pcm_link_rwlock);
136 }
137}
138EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
139
30b771cf
TI		 140/**
141 * snd_pcm_stream_lock_irq - Lock the PCM stream
142 * @substream: PCM substream
143 *
144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
146 * as snd_pcm_stream_lock().
147 */
7af142f7
TI		 148void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
149{
150 if (!substream->pcm->nonatomic)
151 local_irq_disable();
152 snd_pcm_stream_lock(substream);
153}
154EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
155
30b771cf
TI		 156/**
157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
158 * @substream: PCM substream
159 *
160 * This is a counter-part of snd_pcm_stream_lock_irq().
161 */
7af142f7
TI		 162void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
163{
164 snd_pcm_stream_unlock(substream);
165 if (!substream->pcm->nonatomic)
166 local_irq_enable();
167}
168EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
169
170unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
171{
172 unsigned long flags = 0;
173 if (!substream->pcm->nonatomic)
174 local_irq_save(flags);
175 snd_pcm_stream_lock(substream);
176 return flags;
177}
178EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
179
30b771cf
TI		 180/**
181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
182 * @substream: PCM substream
183 * @flags: irq flags
184 *
185 * This is a counter-part of snd_pcm_stream_lock_irqsave().
186 */
7af142f7
TI		 187void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
188 unsigned long flags)
189{
190 snd_pcm_stream_unlock(substream);
191 if (!substream->pcm->nonatomic)
192 local_irq_restore(flags);
193}
194EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
1da177e4 195
877211f5 196int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
1da177e4 197{
877211f5
TI		 198 struct snd_pcm_runtime *runtime;
199 struct snd_pcm *pcm = substream->pcm;
200 struct snd_pcm_str *pstr = substream->pstr;
1da177e4 201
1da177e4
LT		 202 memset(info, 0, sizeof(*info));
203 info->card = pcm->card->number;
204 info->device = pcm->device;
205 info->stream = substream->stream;
206 info->subdevice = substream->number;
207 strlcpy(info->id, pcm->id, sizeof(info->id));
208 strlcpy(info->name, pcm->name, sizeof(info->name));
209 info->dev_class = pcm->dev_class;
210 info->dev_subclass = pcm->dev_subclass;
211 info->subdevices_count = pstr->substream_count;
212 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
213 strlcpy(info->subname, substream->name, sizeof(info->subname));
214 runtime = substream->runtime;
215 /* AB: FIXME!!! This is definitely nonsense */
216 if (runtime) {
217 info->sync = runtime->sync;
218 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
219 }
220 return 0;
221}
222
877211f5
TI		 223int snd_pcm_info_user(struct snd_pcm_substream *substream,
224 struct snd_pcm_info __user * _info)
1da177e4 225{
877211f5 226 struct snd_pcm_info *info;
1da177e4
LT		 227 int err;
228
229 info = kmalloc(sizeof(*info), GFP_KERNEL);
230 if (! info)
231 return -ENOMEM;
232 err = snd_pcm_info(substream, info);
233 if (err >= 0) {
234 if (copy_to_user(_info, info, sizeof(*info)))
235 err = -EFAULT;
236 }
237 kfree(info);
238 return err;
239}
240
63825f3a
TI		 241static bool hw_support_mmap(struct snd_pcm_substream *substream)
242{
243 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
244 return false;
245 /* check architectures that return -EINVAL from dma_mmap_coherent() */
246 /* FIXME: this should be some global flag */
247#if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
248 defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
249 if (!substream->ops->mmap &&
250 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
251 return false;
252#endif
253 return true;
254}
255
561e1cad
TS		 256static int constrain_mask_params(struct snd_pcm_substream *substream,
257 struct snd_pcm_hw_params *params)
258{
259 struct snd_pcm_hw_constraints *constrs =
260 &substream->runtime->hw_constraints;
261 struct snd_mask *m;
262 unsigned int k;
263 struct snd_mask old_mask;
264 int changed;
265
266 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
267 m = hw_param_mask(params, k);
268 if (snd_mask_empty(m))
269 return -EINVAL;
d81052f9
TS		 270
271 /* This parameter is not requested to change by a caller. */
561e1cad
TS		 272 if (!(params->rmask & (1 << k)))
273 continue;
274
275 if (trace_hw_mask_param_enabled())
276 old_mask = *m;
277
278 changed = snd_mask_refine(m, constrs_mask(constrs, k));
f74ae15f
TS		 279 if (changed < 0)
280 return changed;
82e7d501
TS		 281 if (changed == 0)
282 continue;
561e1cad 283
d81052f9 284 /* Set corresponding flag so that the caller gets it. */
82e7d501
TS		 285 trace_hw_mask_param(substream, k, 0, &old_mask, m);
286 params->cmask |= 1 << k;
561e1cad
TS		 287 }
288
289 return 0;
290}
291
3432fa04
TS		 292static int constrain_interval_params(struct snd_pcm_substream *substream,
293 struct snd_pcm_hw_params *params)
294{
295 struct snd_pcm_hw_constraints *constrs =
296 &substream->runtime->hw_constraints;
297 struct snd_interval *i;
298 unsigned int k;
299 struct snd_interval old_interval;
300 int changed;
301
302 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
303 i = hw_param_interval(params, k);
304 if (snd_interval_empty(i))
305 return -EINVAL;
d81052f9
TS		 306
307 /* This parameter is not requested to change by a caller. */
3432fa04
TS		 308 if (!(params->rmask & (1 << k)))
309 continue;
310
311 if (trace_hw_interval_param_enabled())
312 old_interval = *i;
313
314 changed = snd_interval_refine(i, constrs_interval(constrs, k));
f74ae15f
TS		 315 if (changed < 0)
316 return changed;
82e7d501
TS		 317 if (changed == 0)
318 continue;
3432fa04 319
d81052f9 320 /* Set corresponding flag so that the caller gets it. */
82e7d501
TS		 321 trace_hw_interval_param(substream, k, 0, &old_interval, i);
322 params->cmask |= 1 << k;
3432fa04
TS		 323 }
324
325 return 0;
326}
327
9cc07f55
TS		 328static int constrain_params_by_rules(struct snd_pcm_substream *substream,
329 struct snd_pcm_hw_params *params)
1da177e4 330{
9cc07f55
TS		 331 struct snd_pcm_hw_constraints *constrs =
332 &substream->runtime->hw_constraints;
1da177e4 333 unsigned int k;
1da177e4
LT		 334 unsigned int rstamps[constrs->rules_num];
335 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
d81052f9 336 unsigned int stamp;
a1c06e39
TS		 337 struct snd_pcm_hw_rule *r;
338 unsigned int d;
9cc07f55
TS		 339 struct snd_mask old_mask;
340 struct snd_interval old_interval;
a1c06e39 341 bool again;
9cc07f55 342 int changed;
1da177e4 343
d81052f9
TS		 344 /*
345 * Each application of rule has own sequence number.
346 *
347 * Each member of 'rstamps' array represents the sequence number of
348 * recent application of corresponding rule.
349 */
1da177e4
LT		 350 for (k = 0; k < constrs->rules_num; k++)
351 rstamps[k] = 0;
d81052f9
TS		 352
353 /*
354 * Each member of 'vstamps' array represents the sequence number of
355 * recent application of rule in which corresponding parameters were
356 * changed.
357 *
358 * In initial state, elements corresponding to parameters requested by
359 * a caller is 1. For unrequested parameters, corresponding members
360 * have 0 so that the parameters are never changed anymore.
361 */
9cc07f55 362 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1da177e4 363 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
d81052f9
TS		 364
365 /* Due to the above design, actual sequence number starts at 2. */
366 stamp = 2;
0d4e3999 367retry:
d81052f9 368 /* Apply all rules in order. */
a1c06e39 369 again = false;
0d4e3999 370 for (k = 0; k < constrs->rules_num; k++) {
a1c06e39 371 r = &constrs->rules[k];
d81052f9
TS		 372
373 /*
374 * Check condition bits of this rule. When the rule has
375 * some condition bits, parameter without the bits is
376 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
377 * is an example of the condition bits.
378 */
0d4e3999
TS		 379 if (r->cond && !(r->cond & params->flags))
380 continue;
d81052f9
TS		 381
382 /*
383 * The 'deps' array includes maximum three dependencies
384 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
385 * member of this array is a sentinel and should be
386 * negative value.
387 *
388 * This rule should be processed in this time when dependent
389 * parameters were changed at former applications of the other
390 * rules.
391 */
0d4e3999 392 for (d = 0; r->deps[d] >= 0; d++) {
d656b4a6 393 if (vstamps[r->deps[d]] > rstamps[k])
0d4e3999 394 break;
0d4e3999 395 }
d656b4a6 396 if (r->deps[d] < 0)
0d4e3999 397 continue;
be4e31da 398
0d4e3999
TS		 399 if (trace_hw_mask_param_enabled()) {
400 if (hw_is_mask(r->var))
401 old_mask = *hw_param_mask(params, r->var);
402 }
403 if (trace_hw_interval_param_enabled()) {
404 if (hw_is_interval(r->var))
405 old_interval = *hw_param_interval(params, r->var);
406 }
c6706de0 407
0d4e3999 408 changed = r->func(params, r);
f74ae15f
TS		 409 if (changed < 0)
410 return changed;
c6706de0 411
d81052f9 412 /*
82e7d501 413 * When the parameter is changed, notify it to the caller
d81052f9
TS		 414 * by corresponding returned bit, then preparing for next
415 * iteration.
416 */
0d4e3999 417 if (changed && r->var >= 0) {
82e7d501
TS		 418 if (hw_is_mask(r->var)) {
419 trace_hw_mask_param(substream, r->var,
420 k + 1, &old_mask,
421 hw_param_mask(params, r->var));
422 }
423 if (hw_is_interval(r->var)) {
424 trace_hw_interval_param(substream, r->var,
425 k + 1, &old_interval,
426 hw_param_interval(params, r->var));
427 }
428
0d4e3999
TS		 429 params->cmask |= (1 << r->var);
430 vstamps[r->var] = stamp;
a1c06e39 431 again = true;
1da177e4 432 }
f74ae15f 433
82e7d501 434 rstamps[k] = stamp++;
0d4e3999
TS		 435 }
436
d81052f9 437 /* Iterate to evaluate all rules till no parameters are changed. */
0d4e3999
TS		 438 if (again)
439 goto retry;
9cc07f55
TS		 440
441 return 0;
442}
443
f9a076bf
TS		 444static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
445 struct snd_pcm_hw_params *params)
446{
447 const struct snd_interval *i;
448 const struct snd_mask *m;
449 int err;
450
451 if (!params->msbits) {
452 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
453 if (snd_interval_single(i))
454 params->msbits = snd_interval_value(i);
455 }
456
457 if (!params->rate_den) {
458 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
459 if (snd_interval_single(i)) {
460 params->rate_num = snd_interval_value(i);
461 params->rate_den = 1;
462 }
463 }
464
465 if (!params->fifo_size) {
466 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
467 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
468 if (snd_mask_single(m) && snd_interval_single(i)) {
469 err = substream->ops->ioctl(substream,
470 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
471 if (err < 0)
472 return err;
473 }
474 }
475
7802fb52
TS		 476 if (!params->info) {
477 params->info = substream->runtime->hw.info;
478 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
479 SNDRV_PCM_INFO_DRAIN_TRIGGER);
480 if (!hw_support_mmap(substream))
481 params->info &= ~(SNDRV_PCM_INFO_MMAP |
482 SNDRV_PCM_INFO_MMAP_VALID);
483 }
484
f9a076bf
TS		 485 return 0;
486}
487
9cc07f55
TS		 488int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
489 struct snd_pcm_hw_params *params)
490{
9cc07f55
TS		 491 int err;
492
493 params->info = 0;
494 params->fifo_size = 0;
495 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
496 params->msbits = 0;
497 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
498 params->rate_num = 0;
499 params->rate_den = 0;
500 }
501
502 err = constrain_mask_params(substream, params);
503 if (err < 0)
504 return err;
505
506 err = constrain_interval_params(substream, params);
507 if (err < 0)
508 return err;
509
510 err = constrain_params_by_rules(substream, params);
511 if (err < 0)
512 return err;
513
1da177e4 514 params->rmask = 0;
7802fb52 515
1da177e4
LT		 516 return 0;
517}
e88e8ae6
TI		 518EXPORT_SYMBOL(snd_pcm_hw_refine);
519
877211f5
TI		 520static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
521 struct snd_pcm_hw_params __user * _params)
1da177e4 522{
877211f5 523 struct snd_pcm_hw_params *params;
1da177e4
LT		 524 int err;
525
ef44a1ec
LZ		 526 params = memdup_user(_params, sizeof(*params));
527 if (IS_ERR(params))
528 return PTR_ERR(params);
529
1da177e4 530 err = snd_pcm_hw_refine(substream, params);
f74ae15f
TS		 531 if (err < 0)
532 goto end;
ef44a1ec 533
f74ae15f
TS		 534 err = fixup_unreferenced_params(substream, params);
535 if (err < 0)
536 goto end;
537
538 if (copy_to_user(_params, params, sizeof(*params)))
539 err = -EFAULT;
540end:
1da177e4
LT		 541 kfree(params);
542 return err;
543}
544
9442e691
TI		 545static int period_to_usecs(struct snd_pcm_runtime *runtime)
546{
547 int usecs;
548
549 if (! runtime->rate)
550 return -1; /* invalid */
551
552 /* take 75% of period time as the deadline */
553 usecs = (750000 / runtime->rate) * runtime->period_size;
554 usecs += ((750000 % runtime->rate) * runtime->period_size) /
555 runtime->rate;
556
557 return usecs;
558}
559
9b0573c0
TI		 560static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
561{
562 snd_pcm_stream_lock_irq(substream);
563 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
564 substream->runtime->status->state = state;
565 snd_pcm_stream_unlock_irq(substream);
566}
567
90bbaf66
JY		 568static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
569 int event)
570{
571#ifdef CONFIG_SND_PCM_TIMER
572 if (substream->timer)
573 snd_timer_notify(substream->timer, event,
574 &substream->runtime->trigger_tstamp);
575#endif
576}
577
60f96aae
TS		 578/**
579 * snd_pcm_hw_param_choose - choose a configuration defined by @params
580 * @pcm: PCM instance
581 * @params: the hw_params instance
582 *
583 * Choose one configuration from configuration space defined by @params.
584 * The configuration chosen is that obtained fixing in this order:
585 * first access, first format, first subformat, min channels,
586 * min rate, min period time, max buffer size, min tick time
587 *
588 * Return: Zero if successful, or a negative error code on failure.
589 */
590static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
591 struct snd_pcm_hw_params *params)
592{
593 static const int vars[] = {
594 SNDRV_PCM_HW_PARAM_ACCESS,
595 SNDRV_PCM_HW_PARAM_FORMAT,
596 SNDRV_PCM_HW_PARAM_SUBFORMAT,
597 SNDRV_PCM_HW_PARAM_CHANNELS,
598 SNDRV_PCM_HW_PARAM_RATE,
599 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
600 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
601 SNDRV_PCM_HW_PARAM_TICK_TIME,
602 -1
603 };
604 const int *v;
7b8a54af
TS		 605 struct snd_mask old_mask;
606 struct snd_interval old_interval;
82e7d501 607 int changed;
60f96aae
TS		 608
609 for (v = vars; *v != -1; v++) {
7b8a54af
TS		 610 /* Keep old parameter to trace. */
611 if (trace_hw_mask_param_enabled()) {
612 if (hw_is_mask(*v))
613 old_mask = *hw_param_mask(params, *v);
614 }
615 if (trace_hw_interval_param_enabled()) {
616 if (hw_is_interval(*v))
617 old_interval = *hw_param_interval(params, *v);
618 }
60f96aae 619 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
82e7d501 620 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
60f96aae 621 else
82e7d501
TS		 622 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
623 if (snd_BUG_ON(changed < 0))
624 return changed;
625 if (changed == 0)
626 continue;
7b8a54af 627
82e7d501 628 /* Trace the changed parameter. */
7b8a54af
TS		 629 if (hw_is_mask(*v)) {
630 trace_hw_mask_param(pcm, *v, 0, &old_mask,
631 hw_param_mask(params, *v));
632 }
633 if (hw_is_interval(*v)) {
634 trace_hw_interval_param(pcm, *v, 0, &old_interval,
635 hw_param_interval(params, *v));
636 }
60f96aae 637 }
7b8a54af 638
60f96aae
TS		 639 return 0;
640}
641
877211f5
TI		 642static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
643 struct snd_pcm_hw_params *params)
1da177e4 644{
877211f5 645 struct snd_pcm_runtime *runtime;
9442e691 646 int err, usecs;
1da177e4
LT		 647 unsigned int bits;
648 snd_pcm_uframes_t frames;
649
7eaa943c
TI		 650 if (PCM_RUNTIME_CHECK(substream))
651 return -ENXIO;
1da177e4 652 runtime = substream->runtime;
1da177e4
LT		 653 snd_pcm_stream_lock_irq(substream);
654 switch (runtime->status->state) {
655 case SNDRV_PCM_STATE_OPEN:
656 case SNDRV_PCM_STATE_SETUP:
657 case SNDRV_PCM_STATE_PREPARED:
658 break;
659 default:
660 snd_pcm_stream_unlock_irq(substream);
661 return -EBADFD;
662 }
663 snd_pcm_stream_unlock_irq(substream);
8eeaa2f9 664#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1da177e4
LT		 665 if (!substream->oss.oss)
666#endif
9c323fcb 667 if (atomic_read(&substream->mmap_count))
1da177e4
LT		 668 return -EBADFD;
669
670 params->rmask = ~0U;
671 err = snd_pcm_hw_refine(substream, params);
672 if (err < 0)
673 goto _error;
674
675 err = snd_pcm_hw_params_choose(substream, params);
676 if (err < 0)
677 goto _error;
678
f9a076bf
TS		 679 err = fixup_unreferenced_params(substream, params);
680 if (err < 0)
681 goto _error;
682
1da177e4
LT		 683 if (substream->ops->hw_params != NULL) {
684 err = substream->ops->hw_params(substream, params);
685 if (err < 0)
686 goto _error;
687 }
688
689 runtime->access = params_access(params);
690 runtime->format = params_format(params);
691 runtime->subformat = params_subformat(params);
692 runtime->channels = params_channels(params);
693 runtime->rate = params_rate(params);
694 runtime->period_size = params_period_size(params);
695 runtime->periods = params_periods(params);
696 runtime->buffer_size = params_buffer_size(params);
1da177e4
LT		 697 runtime->info = params->info;
698 runtime->rate_num = params->rate_num;
699 runtime->rate_den = params->rate_den;
ab69a490
CL		 700 runtime->no_period_wakeup =
701 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
702 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
1da177e4
LT		 703
704 bits = snd_pcm_format_physical_width(runtime->format);
705 runtime->sample_bits = bits;
706 bits *= runtime->channels;
707 runtime->frame_bits = bits;
708 frames = 1;
709 while (bits % 8 != 0) {
710 bits *= 2;
711 frames *= 2;
712 }
713 runtime->byte_align = bits / 8;
714 runtime->min_align = frames;
715
716 /* Default sw params */
717 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
718 runtime->period_step = 1;
1da177e4 719 runtime->control->avail_min = runtime->period_size;
1da177e4
LT		 720 runtime->start_threshold = 1;
721 runtime->stop_threshold = runtime->buffer_size;
722 runtime->silence_threshold = 0;
723 runtime->silence_size = 0;
ead4046b
CL		 724 runtime->boundary = runtime->buffer_size;
725 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
726 runtime->boundary *= 2;
1da177e4
LT		 727
728 snd_pcm_timer_resolution_change(substream);
9b0573c0 729 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
9442e691 730
82f68251
JB		 731 if (pm_qos_request_active(&substream->latency_pm_qos_req))
732 pm_qos_remove_request(&substream->latency_pm_qos_req);
9442e691 733 if ((usecs = period_to_usecs(runtime)) >= 0)
82f68251
JB		 734 pm_qos_add_request(&substream->latency_pm_qos_req,
735 PM_QOS_CPU_DMA_LATENCY, usecs);
1da177e4
LT		 736 return 0;
737 _error:
25985edc 738 /* hardware might be unusable from this time,
1da177e4
LT		 739 so we force application to retry to set
740 the correct hardware parameter settings */
9b0573c0 741 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
1da177e4
LT		 742 if (substream->ops->hw_free != NULL)
743 substream->ops->hw_free(substream);
744 return err;
745}
746
877211f5
TI		 747static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
748 struct snd_pcm_hw_params __user * _params)
1da177e4 749{
877211f5 750 struct snd_pcm_hw_params *params;
1da177e4
LT		 751 int err;
752
ef44a1ec
LZ		 753 params = memdup_user(_params, sizeof(*params));
754 if (IS_ERR(params))
755 return PTR_ERR(params);
756
1da177e4 757 err = snd_pcm_hw_params(substream, params);
f74ae15f
TS		 758 if (err < 0)
759 goto end;
ef44a1ec 760
f74ae15f
TS		 761 if (copy_to_user(_params, params, sizeof(*params)))
762 err = -EFAULT;
763end:
1da177e4
LT		 764 kfree(params);
765 return err;
766}
767
877211f5 768static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
1da177e4 769{
877211f5 770 struct snd_pcm_runtime *runtime;
1da177e4
LT		 771 int result = 0;
772
7eaa943c
TI		 773 if (PCM_RUNTIME_CHECK(substream))
774 return -ENXIO;
1da177e4 775 runtime = substream->runtime;
1da177e4
LT		 776 snd_pcm_stream_lock_irq(substream);
777 switch (runtime->status->state) {
778 case SNDRV_PCM_STATE_SETUP:
779 case SNDRV_PCM_STATE_PREPARED:
780 break;
781 default:
782 snd_pcm_stream_unlock_irq(substream);
783 return -EBADFD;
784 }
785 snd_pcm_stream_unlock_irq(substream);
9c323fcb 786 if (atomic_read(&substream->mmap_count))
1da177e4
LT		 787 return -EBADFD;
788 if (substream->ops->hw_free)
789 result = substream->ops->hw_free(substream);
9b0573c0 790 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
82f68251 791 pm_qos_remove_request(&substream->latency_pm_qos_req);
1da177e4
LT		 792 return result;
793}
794
877211f5
TI		 795static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
796 struct snd_pcm_sw_params *params)
1da177e4 797{
877211f5 798 struct snd_pcm_runtime *runtime;
1250932e 799 int err;
1da177e4 800
7eaa943c
TI		 801 if (PCM_RUNTIME_CHECK(substream))
802 return -ENXIO;
1da177e4 803 runtime = substream->runtime;
1da177e4
LT		 804 snd_pcm_stream_lock_irq(substream);
805 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
806 snd_pcm_stream_unlock_irq(substream);
807 return -EBADFD;
808 }
809 snd_pcm_stream_unlock_irq(substream);
810
145d92e7
DC		 811 if (params->tstamp_mode < 0 ||
812 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
1da177e4 813 return -EINVAL;
58900810
TI		 814 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
815 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
5646eda5 816 return -EINVAL;
1da177e4
LT		 817 if (params->avail_min == 0)
818 return -EINVAL;
1da177e4
LT		 819 if (params->silence_size >= runtime->boundary) {
820 if (params->silence_threshold != 0)
821 return -EINVAL;
822 } else {
823 if (params->silence_size > params->silence_threshold)
824 return -EINVAL;
825 if (params->silence_threshold > runtime->buffer_size)
826 return -EINVAL;
827 }
1250932e 828 err = 0;
1da177e4
LT		 829 snd_pcm_stream_lock_irq(substream);
830 runtime->tstamp_mode = params->tstamp_mode;
58900810
TI		 831 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
832 runtime->tstamp_type = params->tstamp_type;
1da177e4
LT		 833 runtime->period_step = params->period_step;
834 runtime->control->avail_min = params->avail_min;
835 runtime->start_threshold = params->start_threshold;
836 runtime->stop_threshold = params->stop_threshold;
837 runtime->silence_threshold = params->silence_threshold;
838 runtime->silence_size = params->silence_size;
1da177e4
LT		 839 params->boundary = runtime->boundary;
840 if (snd_pcm_running(substream)) {
1da177e4
LT		 841 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
842 runtime->silence_size > 0)
843 snd_pcm_playback_silence(substream, ULONG_MAX);
1250932e 844 err = snd_pcm_update_state(substream, runtime);
1da177e4
LT		 845 }
846 snd_pcm_stream_unlock_irq(substream);
1250932e 847 return err;
1da177e4
LT		 848}
849
877211f5
TI		 850static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
851 struct snd_pcm_sw_params __user * _params)
1da177e4 852{
877211f5 853 struct snd_pcm_sw_params params;
1da177e4
LT		 854 int err;
855 if (copy_from_user(&params, _params, sizeof(params)))
856 return -EFAULT;
857 err = snd_pcm_sw_params(substream, &params);
858 if (copy_to_user(_params, &params, sizeof(params)))
859 return -EFAULT;
860 return err;
861}
862
877211f5
TI		 863int snd_pcm_status(struct snd_pcm_substream *substream,
864 struct snd_pcm_status *status)
1da177e4 865{
877211f5 866 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 867
868 snd_pcm_stream_lock_irq(substream);
3179f620
PLB		 869
870 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
871 &runtime->audio_tstamp_config);
872
873 /* backwards compatible behavior */
874 if (runtime->audio_tstamp_config.type_requested ==
875 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
876 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
877 runtime->audio_tstamp_config.type_requested =
878 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
879 else
880 runtime->audio_tstamp_config.type_requested =
881 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
882 runtime->audio_tstamp_report.valid = 0;
883 } else
884 runtime->audio_tstamp_report.valid = 1;
885
1da177e4
LT		 886 status->state = runtime->status->state;
887 status->suspended_state = runtime->status->suspended_state;
888 if (status->state == SNDRV_PCM_STATE_OPEN)
889 goto _end;
890 status->trigger_tstamp = runtime->trigger_tstamp;
8c121586 891 if (snd_pcm_running(substream)) {
1da177e4 892 snd_pcm_update_hw_ptr(substream);
8c121586
JK		 893 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
894 status->tstamp = runtime->status->tstamp;
3179f620 895 status->driver_tstamp = runtime->driver_tstamp;
4eeaaeae
PLB		 896 status->audio_tstamp =
897 runtime->status->audio_tstamp;
3179f620
PLB		 898 if (runtime->audio_tstamp_report.valid == 1)
899 /* backwards compatibility, no report provided in COMPAT mode */
900 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
901 &status->audio_tstamp_accuracy,
902 &runtime->audio_tstamp_report);
903
8c121586
JK		 904 goto _tstamp_end;
905 }
0d59b814
PLB		 906 } else {
907 /* get tstamp only in fallback mode and only if enabled */
908 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
909 snd_pcm_gettime(runtime, &status->tstamp);
8c121586 910 }
8c121586 911 _tstamp_end:
1da177e4
LT		 912 status->appl_ptr = runtime->control->appl_ptr;
913 status->hw_ptr = runtime->status->hw_ptr;
914 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
915 status->avail = snd_pcm_playback_avail(runtime);
916 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
4bbe1ddf 917 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1da177e4 918 status->delay = runtime->buffer_size - status->avail;
4bbe1ddf
TI		 919 status->delay += runtime->delay;
920 } else
1da177e4
LT		 921 status->delay = 0;
922 } else {
923 status->avail = snd_pcm_capture_avail(runtime);
924 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
4bbe1ddf 925 status->delay = status->avail + runtime->delay;
1da177e4
LT		 926 else
927 status->delay = 0;
928 }
929 status->avail_max = runtime->avail_max;
930 status->overrange = runtime->overrange;
931 runtime->avail_max = 0;
932 runtime->overrange = 0;
933 _end:
934 snd_pcm_stream_unlock_irq(substream);
935 return 0;
936}
937
877211f5 938static int snd_pcm_status_user(struct snd_pcm_substream *substream,
38ca2a4d
PLB		 939 struct snd_pcm_status __user * _status,
940 bool ext)
1da177e4 941{
877211f5 942 struct snd_pcm_status status;
1da177e4 943 int res;
38ca2a4d 944
1da177e4 945 memset(&status, 0, sizeof(status));
38ca2a4d
PLB		 946 /*
947 * with extension, parameters are read/write,
948 * get audio_tstamp_data from user,
949 * ignore rest of status structure
950 */
951 if (ext && get_user(status.audio_tstamp_data,
952 (u32 __user *)(&_status->audio_tstamp_data)))
953 return -EFAULT;
1da177e4
LT		 954 res = snd_pcm_status(substream, &status);
955 if (res < 0)
956 return res;
957 if (copy_to_user(_status, &status, sizeof(status)))
958 return -EFAULT;
959 return 0;
960}
961
877211f5
TI		 962static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
963 struct snd_pcm_channel_info * info)
1da177e4 964{
877211f5 965 struct snd_pcm_runtime *runtime;
1da177e4
LT		 966 unsigned int channel;
967
1da177e4
LT		 968 channel = info->channel;
969 runtime = substream->runtime;
970 snd_pcm_stream_lock_irq(substream);
971 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
972 snd_pcm_stream_unlock_irq(substream);
973 return -EBADFD;
974 }
975 snd_pcm_stream_unlock_irq(substream);
976 if (channel >= runtime->channels)
977 return -EINVAL;
978 memset(info, 0, sizeof(*info));
979 info->channel = channel;
980 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
981}
982
877211f5
TI		 983static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
984 struct snd_pcm_channel_info __user * _info)
1da177e4 985{
877211f5 986 struct snd_pcm_channel_info info;
1da177e4
LT		 987 int res;
988
989 if (copy_from_user(&info, _info, sizeof(info)))
990 return -EFAULT;
991 res = snd_pcm_channel_info(substream, &info);
992 if (res < 0)
993 return res;
994 if (copy_to_user(_info, &info, sizeof(info)))
995 return -EFAULT;
996 return 0;
997}
998
877211f5 999static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1da177e4 1000{
877211f5 1001 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1002 if (runtime->trigger_master == NULL)
1003 return;
1004 if (runtime->trigger_master == substream) {
2b79d7a6
PLB		 1005 if (!runtime->trigger_tstamp_latched)
1006 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1da177e4
LT		 1007 } else {
1008 snd_pcm_trigger_tstamp(runtime->trigger_master);
1009 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1010 }
1011 runtime->trigger_master = NULL;
1012}
1013
1014struct action_ops {
877211f5
TI		 1015 int (*pre_action)(struct snd_pcm_substream *substream, int state);
1016 int (*do_action)(struct snd_pcm_substream *substream, int state);
1017 void (*undo_action)(struct snd_pcm_substream *substream, int state);
1018 void (*post_action)(struct snd_pcm_substream *substream, int state);
1da177e4
LT		 1019};
1020
1021/*
1022 * this functions is core for handling of linked stream
1023 * Note: the stream state might be changed also on failure
1024 * Note2: call with calling stream lock + link lock
1025 */
b17154cf 1026static int snd_pcm_action_group(const struct action_ops *ops,
877211f5 1027 struct snd_pcm_substream *substream,
1da177e4
LT		 1028 int state, int do_lock)
1029{
877211f5
TI		 1030 struct snd_pcm_substream *s = NULL;
1031 struct snd_pcm_substream *s1;
dde1c652 1032 int res = 0, depth = 1;
1da177e4 1033
ef991b95 1034 snd_pcm_group_for_each_entry(s, substream) {
257f8cce
TI		 1035 if (do_lock && s != substream) {
1036 if (s->pcm->nonatomic)
dde1c652 1037 mutex_lock_nested(&s->self_group.mutex, depth);
257f8cce 1038 else
dde1c652
TI		 1039 spin_lock_nested(&s->self_group.lock, depth);
1040 depth++;
257f8cce 1041 }
1da177e4
LT		 1042 res = ops->pre_action(s, state);
1043 if (res < 0)
1044 goto _unlock;
1045 }
ef991b95 1046 snd_pcm_group_for_each_entry(s, substream) {
1da177e4
LT		 1047 res = ops->do_action(s, state);
1048 if (res < 0) {
1049 if (ops->undo_action) {
ef991b95 1050 snd_pcm_group_for_each_entry(s1, substream) {
1da177e4
LT		 1051 if (s1 == s) /* failed stream */
1052 break;
1053 ops->undo_action(s1, state);
1054 }
1055 }
1056 s = NULL; /* unlock all */
1057 goto _unlock;
1058 }
1059 }
ef991b95 1060 snd_pcm_group_for_each_entry(s, substream) {
1da177e4
LT		 1061 ops->post_action(s, state);
1062 }
1063 _unlock:
1064 if (do_lock) {
1065 /* unlock streams */
ef991b95 1066 snd_pcm_group_for_each_entry(s1, substream) {
257f8cce 1067 if (s1 != substream) {
811deede 1068 if (s1->pcm->nonatomic)
257f8cce
TI		 1069 mutex_unlock(&s1->self_group.mutex);
1070 else
1071 spin_unlock(&s1->self_group.lock);
1072 }
1da177e4
LT		 1073 if (s1 == s) /* end */
1074 break;
1075 }
1076 }
1077 return res;
1078}
1079
1080/*
1081 * Note: call with stream lock
1082 */
b17154cf 1083static int snd_pcm_action_single(const struct action_ops *ops,
877211f5 1084 struct snd_pcm_substream *substream,
1da177e4
LT		 1085 int state)
1086{
1087 int res;
1088
1089 res = ops->pre_action(substream, state);
1090 if (res < 0)
1091 return res;
1092 res = ops->do_action(substream, state);
1093 if (res == 0)
1094 ops->post_action(substream, state);
1095 else if (ops->undo_action)
1096 ops->undo_action(substream, state);
1097 return res;
1098}
1099
aa8edd8c
TI		 1100/*
1101 * Note: call with stream lock
1102 */
b17154cf 1103static int snd_pcm_action(const struct action_ops *ops,
aa8edd8c
TI		 1104 struct snd_pcm_substream *substream,
1105 int state)
257f8cce
TI		 1106{
1107 int res;
1108
aa8edd8c
TI		 1109 if (!snd_pcm_stream_linked(substream))
1110 return snd_pcm_action_single(ops, substream, state);
1111
1112 if (substream->pcm->nonatomic) {
257f8cce
TI		 1113 if (!mutex_trylock(&substream->group->mutex)) {
1114 mutex_unlock(&substream->self_group.mutex);
1115 mutex_lock(&substream->group->mutex);
1116 mutex_lock(&substream->self_group.mutex);
1117 }
1118 res = snd_pcm_action_group(ops, substream, state, 1);
1119 mutex_unlock(&substream->group->mutex);
1120 } else {
1da177e4
LT		 1121 if (!spin_trylock(&substream->group->lock)) {
1122 spin_unlock(&substream->self_group.lock);
1123 spin_lock(&substream->group->lock);
1124 spin_lock(&substream->self_group.lock);
1125 }
1126 res = snd_pcm_action_group(ops, substream, state, 1);
1127 spin_unlock(&substream->group->lock);
1da177e4
LT		 1128 }
1129 return res;
1130}
1131
1132/*
1133 * Note: don't use any locks before
1134 */
b17154cf 1135static int snd_pcm_action_lock_irq(const struct action_ops *ops,
877211f5 1136 struct snd_pcm_substream *substream,
1da177e4
LT		 1137 int state)
1138{
1139 int res;
1140
e3a4bd5e
TI		 1141 snd_pcm_stream_lock_irq(substream);
1142 res = snd_pcm_action(ops, substream, state);
1143 snd_pcm_stream_unlock_irq(substream);
1da177e4
LT		 1144 return res;
1145}
1146
1147/*
1148 */
b17154cf 1149static int snd_pcm_action_nonatomic(const struct action_ops *ops,
877211f5 1150 struct snd_pcm_substream *substream,
1da177e4
LT		 1151 int state)
1152{
1153 int res;
1154
1155 down_read(&snd_pcm_link_rwsem);
1156 if (snd_pcm_stream_linked(substream))
1157 res = snd_pcm_action_group(ops, substream, state, 0);
1158 else
1159 res = snd_pcm_action_single(ops, substream, state);
1160 up_read(&snd_pcm_link_rwsem);
1161 return res;
1162}
1163
1164/*
1165 * start callbacks
1166 */
877211f5 1167static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1da177e4 1168{
877211f5 1169 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1170 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1171 return -EBADFD;
1172 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1173 !snd_pcm_playback_data(substream))
1174 return -EPIPE;
2b79d7a6 1175 runtime->trigger_tstamp_latched = false;
1da177e4
LT		 1176 runtime->trigger_master = substream;
1177 return 0;
1178}
1179
877211f5 1180static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1181{
1182 if (substream->runtime->trigger_master != substream)
1183 return 0;
1184 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1185}
1186
877211f5 1187static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1188{
1189 if (substream->runtime->trigger_master == substream)
1190 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1191}
1192
877211f5 1193static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1da177e4 1194{
877211f5 1195 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 1196 snd_pcm_trigger_tstamp(substream);
6af3fb72 1197 runtime->hw_ptr_jiffies = jiffies;
bd76af0f
JK		 1198 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1199 runtime->rate;
1da177e4
LT		 1200 runtime->status->state = state;
1201 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1202 runtime->silence_size > 0)
1203 snd_pcm_playback_silence(substream, ULONG_MAX);
90bbaf66 1204 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1da177e4
LT		 1205}
1206
b17154cf 1207static const struct action_ops snd_pcm_action_start = {
1da177e4
LT		 1208 .pre_action = snd_pcm_pre_start,
1209 .do_action = snd_pcm_do_start,
1210 .undo_action = snd_pcm_undo_start,
1211 .post_action = snd_pcm_post_start
1212};
1213
1214/**
1c85cc64 1215 * snd_pcm_start - start all linked streams
df8db936 1216 * @substream: the PCM substream instance
eb7c06e8
YB		 1217 *
1218 * Return: Zero if successful, or a negative error code.
c2c86a97 1219 * The stream lock must be acquired before calling this function.
1da177e4 1220 */
877211f5 1221int snd_pcm_start(struct snd_pcm_substream *substream)
1da177e4 1222{
877211f5
TI		 1223 return snd_pcm_action(&snd_pcm_action_start, substream,
1224 SNDRV_PCM_STATE_RUNNING);
1da177e4
LT		 1225}
1226
c2c86a97
TI		 1227/* take the stream lock and start the streams */
1228static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1229{
1230 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1231 SNDRV_PCM_STATE_RUNNING);
1232}
1233
1da177e4
LT		 1234/*
1235 * stop callbacks
1236 */
877211f5 1237static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1da177e4 1238{
877211f5 1239 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1240 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1241 return -EBADFD;
1242 runtime->trigger_master = substream;
1243 return 0;
1244}
1245
877211f5 1246static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1247{
1248 if (substream->runtime->trigger_master == substream &&
1249 snd_pcm_running(substream))
1250 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1251 return 0; /* unconditonally stop all substreams */
1252}
1253
877211f5 1254static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1da177e4 1255{
877211f5 1256 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1257 if (runtime->status->state != state) {
1258 snd_pcm_trigger_tstamp(substream);
9bc889b4 1259 runtime->status->state = state;
90bbaf66 1260 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1da177e4
LT		 1261 }
1262 wake_up(&runtime->sleep);
c91a988d 1263 wake_up(&runtime->tsleep);
1da177e4
LT		 1264}
1265
b17154cf 1266static const struct action_ops snd_pcm_action_stop = {
1da177e4
LT		 1267 .pre_action = snd_pcm_pre_stop,
1268 .do_action = snd_pcm_do_stop,
1269 .post_action = snd_pcm_post_stop
1270};
1271
1272/**
1c85cc64 1273 * snd_pcm_stop - try to stop all running streams in the substream group
df8db936
TI		 1274 * @substream: the PCM substream instance
1275 * @state: PCM state after stopping the stream
1da177e4 1276 *
1c85cc64 1277 * The state of each stream is then changed to the given state unconditionally.
eb7c06e8 1278 *
0a11458c 1279 * Return: Zero if successful, or a negative error code.
1da177e4 1280 */
fea952e5 1281int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1da177e4
LT		 1282{
1283 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1284}
1285
e88e8ae6
TI		 1286EXPORT_SYMBOL(snd_pcm_stop);
1287
1da177e4 1288/**
1c85cc64 1289 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
df8db936 1290 * @substream: the PCM substream
1da177e4 1291 *
1c85cc64 1292 * After stopping, the state is changed to SETUP.
1da177e4 1293 * Unlike snd_pcm_stop(), this affects only the given stream.
eb7c06e8
YB		 1294 *
1295 * Return: Zero if succesful, or a negative error code.
1da177e4 1296 */
877211f5 1297int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1da177e4 1298{
877211f5
TI		 1299 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1300 SNDRV_PCM_STATE_SETUP);
1da177e4
LT		 1301}
1302
1fb8510c
TI		 1303/**
1304 * snd_pcm_stop_xrun - stop the running streams as XRUN
1305 * @substream: the PCM substream instance
1fb8510c
TI		 1306 *
1307 * This stops the given running substream (and all linked substreams) as XRUN.
1308 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1309 *
1310 * Return: Zero if successful, or a negative error code.
1311 */
1312int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1313{
1314 unsigned long flags;
1315 int ret = 0;
1316
1317 snd_pcm_stream_lock_irqsave(substream, flags);
1318 if (snd_pcm_running(substream))
1319 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1320 snd_pcm_stream_unlock_irqrestore(substream, flags);
1321 return ret;
1322}
1323EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1324
1da177e4
LT		 1325/*
1326 * pause callbacks
1327 */
877211f5 1328static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1da177e4 1329{
877211f5 1330 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1331 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1332 return -ENOSYS;
1333 if (push) {
1334 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1335 return -EBADFD;
1336 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1337 return -EBADFD;
1338 runtime->trigger_master = substream;
1339 return 0;
1340}
1341
877211f5 1342static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1da177e4
LT		 1343{
1344 if (substream->runtime->trigger_master != substream)
1345 return 0;
56385a12
JK		 1346 /* some drivers might use hw_ptr to recover from the pause -
1347 update the hw_ptr now */
1348 if (push)
1349 snd_pcm_update_hw_ptr(substream);
6af3fb72 1350 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
b595076a 1351 * a delta between the current jiffies, this gives a large enough
6af3fb72
TI		 1352 * delta, effectively to skip the check once.
1353 */
1354 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1da177e4
LT		 1355 return substream->ops->trigger(substream,
1356 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1357 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1358}
1359
877211f5 1360static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1da177e4
LT		 1361{
1362 if (substream->runtime->trigger_master == substream)
1363 substream->ops->trigger(substream,
1364 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1365 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1366}
1367
877211f5 1368static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1da177e4 1369{
877211f5 1370 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1371 snd_pcm_trigger_tstamp(substream);
1372 if (push) {
1373 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
90bbaf66 1374 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1da177e4 1375 wake_up(&runtime->sleep);
c91a988d 1376 wake_up(&runtime->tsleep);
1da177e4
LT		 1377 } else {
1378 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
90bbaf66 1379 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1da177e4
LT		 1380 }
1381}
1382
b17154cf 1383static const struct action_ops snd_pcm_action_pause = {
1da177e4
LT		 1384 .pre_action = snd_pcm_pre_pause,
1385 .do_action = snd_pcm_do_pause,
1386 .undo_action = snd_pcm_undo_pause,
1387 .post_action = snd_pcm_post_pause
1388};
1389
1390/*
1391 * Push/release the pause for all linked streams.
1392 */
877211f5 1393static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1da177e4
LT		 1394{
1395 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1396}
1397
1398#ifdef CONFIG_PM
1399/* suspend */
1400
877211f5 1401static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1da177e4 1402{
877211f5 1403 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1404 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1405 return -EBUSY;
1406 runtime->trigger_master = substream;
1407 return 0;
1408}
1409
877211f5 1410static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1da177e4 1411{
877211f5 1412 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1413 if (runtime->trigger_master != substream)
1414 return 0;
1415 if (! snd_pcm_running(substream))
1416 return 0;
1417 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1418 return 0; /* suspend unconditionally */
1419}
1420
877211f5 1421static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1da177e4 1422{
877211f5 1423 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 1424 snd_pcm_trigger_tstamp(substream);
9bc889b4
TI		 1425 runtime->status->suspended_state = runtime->status->state;
1426 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
90bbaf66 1427 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1da177e4 1428 wake_up(&runtime->sleep);
c91a988d 1429 wake_up(&runtime->tsleep);
1da177e4
LT		 1430}
1431
b17154cf 1432static const struct action_ops snd_pcm_action_suspend = {
1da177e4
LT		 1433 .pre_action = snd_pcm_pre_suspend,
1434 .do_action = snd_pcm_do_suspend,
1435 .post_action = snd_pcm_post_suspend
1436};
1437
1438/**
1c85cc64 1439 * snd_pcm_suspend - trigger SUSPEND to all linked streams
df8db936 1440 * @substream: the PCM substream
1da177e4 1441 *
1da177e4 1442 * After this call, all streams are changed to SUSPENDED state.
eb7c06e8
YB		 1443 *
1444 * Return: Zero if successful (or @substream is %NULL), or a negative error
1445 * code.
1da177e4 1446 */
877211f5 1447int snd_pcm_suspend(struct snd_pcm_substream *substream)
1da177e4
LT		 1448{
1449 int err;
1450 unsigned long flags;
1451
603bf524
TI		 1452 if (! substream)
1453 return 0;
1454
1da177e4
LT		 1455 snd_pcm_stream_lock_irqsave(substream, flags);
1456 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1457 snd_pcm_stream_unlock_irqrestore(substream, flags);
1458 return err;
1459}
1460
e88e8ae6
TI		 1461EXPORT_SYMBOL(snd_pcm_suspend);
1462
1da177e4 1463/**
1c85cc64 1464 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
df8db936 1465 * @pcm: the PCM instance
1da177e4 1466 *
1da177e4 1467 * After this call, all streams are changed to SUSPENDED state.
eb7c06e8
YB		 1468 *
1469 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1da177e4 1470 */
877211f5 1471int snd_pcm_suspend_all(struct snd_pcm *pcm)
1da177e4 1472{
877211f5 1473 struct snd_pcm_substream *substream;
1da177e4
LT		 1474 int stream, err = 0;
1475
603bf524
TI		 1476 if (! pcm)
1477 return 0;
1478
1da177e4 1479 for (stream = 0; stream < 2; stream++) {
877211f5
TI		 1480 for (substream = pcm->streams[stream].substream;
1481 substream; substream = substream->next) {
1da177e4
LT		 1482 /* FIXME: the open/close code should lock this as well */
1483 if (substream->runtime == NULL)
1484 continue;
1485 err = snd_pcm_suspend(substream);
1486 if (err < 0 && err != -EBUSY)
1487 return err;
1488 }
1489 }
1490 return 0;
1491}
1492
e88e8ae6
TI		 1493EXPORT_SYMBOL(snd_pcm_suspend_all);
1494
1da177e4
LT		 1495/* resume */
1496
877211f5 1497static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1da177e4 1498{
877211f5 1499 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1500 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1501 return -ENOSYS;
1502 runtime->trigger_master = substream;
1503 return 0;
1504}
1505
877211f5 1506static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1da177e4 1507{
877211f5 1508 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1509 if (runtime->trigger_master != substream)
1510 return 0;
1511 /* DMA not running previously? */
1512 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1513 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1514 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1515 return 0;
1516 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1517}
1518
877211f5 1519static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1520{
1521 if (substream->runtime->trigger_master == substream &&
1522 snd_pcm_running(substream))
1523 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1524}
1525
877211f5 1526static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1da177e4 1527{
877211f5 1528 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 1529 snd_pcm_trigger_tstamp(substream);
9bc889b4 1530 runtime->status->state = runtime->status->suspended_state;
90bbaf66 1531 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1da177e4
LT		 1532}
1533
b17154cf 1534static const struct action_ops snd_pcm_action_resume = {
1da177e4
LT		 1535 .pre_action = snd_pcm_pre_resume,
1536 .do_action = snd_pcm_do_resume,
1537 .undo_action = snd_pcm_undo_resume,
1538 .post_action = snd_pcm_post_resume
1539};
1540
877211f5 1541static int snd_pcm_resume(struct snd_pcm_substream *substream)
1da177e4 1542{
68b4acd3 1543 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1da177e4
LT		 1544}
1545
1546#else
1547
877211f5 1548static int snd_pcm_resume(struct snd_pcm_substream *substream)
1da177e4
LT		 1549{
1550 return -ENOSYS;
1551}
1552
1553#endif /* CONFIG_PM */
1554
1555/*
1556 * xrun ioctl
1557 *
1558 * Change the RUNNING stream(s) to XRUN state.
1559 */
877211f5 1560static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1da177e4 1561{
877211f5 1562 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1563 int result;
1564
1da177e4
LT		 1565 snd_pcm_stream_lock_irq(substream);
1566 switch (runtime->status->state) {
1567 case SNDRV_PCM_STATE_XRUN:
1568 result = 0; /* already there */
1569 break;
1570 case SNDRV_PCM_STATE_RUNNING:
1571 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1572 break;
1573 default:
1574 result = -EBADFD;
1575 }
1576 snd_pcm_stream_unlock_irq(substream);
1da177e4
LT		 1577 return result;
1578}
1579
1580/*
1581 * reset ioctl
1582 */
877211f5 1583static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1da177e4 1584{
877211f5 1585 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1586 switch (runtime->status->state) {
1587 case SNDRV_PCM_STATE_RUNNING:
1588 case SNDRV_PCM_STATE_PREPARED:
1589 case SNDRV_PCM_STATE_PAUSED:
1590 case SNDRV_PCM_STATE_SUSPENDED:
1591 return 0;
1592 default:
1593 return -EBADFD;
1594 }
1595}
1596
877211f5 1597static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1da177e4 1598{
877211f5 1599 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1600 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1601 if (err < 0)
1602 return err;
1da177e4 1603 runtime->hw_ptr_base = 0;
e7636925
JK		 1604 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1605 runtime->status->hw_ptr % runtime->period_size;
1da177e4
LT		 1606 runtime->silence_start = runtime->status->hw_ptr;
1607 runtime->silence_filled = 0;
1608 return 0;
1609}
1610
877211f5 1611static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1da177e4 1612{
877211f5 1613 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1614 runtime->control->appl_ptr = runtime->status->hw_ptr;
1615 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1616 runtime->silence_size > 0)
1617 snd_pcm_playback_silence(substream, ULONG_MAX);
1618}
1619
b17154cf 1620static const struct action_ops snd_pcm_action_reset = {
1da177e4
LT		 1621 .pre_action = snd_pcm_pre_reset,
1622 .do_action = snd_pcm_do_reset,
1623 .post_action = snd_pcm_post_reset
1624};
1625
877211f5 1626static int snd_pcm_reset(struct snd_pcm_substream *substream)
1da177e4
LT		 1627{
1628 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1629}
1630
1631/*
1632 * prepare ioctl
1633 */
0df63e44
TI		 1634/* we use the second argument for updating f_flags */
1635static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1636 int f_flags)
1da177e4 1637{
877211f5 1638 struct snd_pcm_runtime *runtime = substream->runtime;
de1b8b93
TI		 1639 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1640 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1da177e4
LT		 1641 return -EBADFD;
1642 if (snd_pcm_running(substream))
1643 return -EBUSY;
0df63e44 1644 substream->f_flags = f_flags;
1da177e4
LT		 1645 return 0;
1646}
1647
877211f5 1648static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1649{
1650 int err;
1651 err = substream->ops->prepare(substream);
1652 if (err < 0)
1653 return err;
1654 return snd_pcm_do_reset(substream, 0);
1655}
1656
877211f5 1657static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1da177e4 1658{
877211f5 1659 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 1660 runtime->control->appl_ptr = runtime->status->hw_ptr;
9b0573c0 1661 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1da177e4
LT		 1662}
1663
b17154cf 1664static const struct action_ops snd_pcm_action_prepare = {
1da177e4
LT		 1665 .pre_action = snd_pcm_pre_prepare,
1666 .do_action = snd_pcm_do_prepare,
1667 .post_action = snd_pcm_post_prepare
1668};
1669
1670/**
1c85cc64 1671 * snd_pcm_prepare - prepare the PCM substream to be triggerable
df8db936 1672 * @substream: the PCM substream instance
0df63e44 1673 * @file: file to refer f_flags
eb7c06e8
YB		 1674 *
1675 * Return: Zero if successful, or a negative error code.
1da177e4 1676 */
0df63e44
TI		 1677static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1678 struct file *file)
1da177e4 1679{
0df63e44
TI		 1680 int f_flags;
1681
1682 if (file)
1683 f_flags = file->f_flags;
1684 else
1685 f_flags = substream->f_flags;
1da177e4 1686
68b4acd3
TI		 1687 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1688 substream, f_flags);
1da177e4
LT		 1689}
1690
1691/*
1692 * drain ioctl
1693 */
1694
877211f5 1695static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1da177e4 1696{
4f7c39dc
TI		 1697 struct snd_pcm_runtime *runtime = substream->runtime;
1698 switch (runtime->status->state) {
1699 case SNDRV_PCM_STATE_OPEN:
1700 case SNDRV_PCM_STATE_DISCONNECTED:
1701 case SNDRV_PCM_STATE_SUSPENDED:
1702 return -EBADFD;
1703 }
1704 runtime->trigger_master = substream;
1da177e4
LT		 1705 return 0;
1706}
1707
877211f5 1708static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1da177e4 1709{
877211f5 1710 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1711 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1712 switch (runtime->status->state) {
1713 case SNDRV_PCM_STATE_PREPARED:
1714 /* start playback stream if possible */
1715 if (! snd_pcm_playback_empty(substream)) {
1716 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1717 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
70372a75
TI		 1718 } else {
1719 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1da177e4
LT		 1720 }
1721 break;
1722 case SNDRV_PCM_STATE_RUNNING:
1723 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1724 break;
4f7c39dc
TI		 1725 case SNDRV_PCM_STATE_XRUN:
1726 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1727 break;
1da177e4
LT		 1728 default:
1729 break;
1730 }
1731 } else {
1732 /* stop running stream */
1733 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
b05e5787 1734 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1da177e4 1735 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
b05e5787
MŚ		 1736 snd_pcm_do_stop(substream, new_state);
1737 snd_pcm_post_stop(substream, new_state);
1da177e4
LT		 1738 }
1739 }
48d88297
LY		 1740
1741 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1742 runtime->trigger_master == substream &&
1743 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1744 return substream->ops->trigger(substream,
1745 SNDRV_PCM_TRIGGER_DRAIN);
1746
1da177e4
LT		 1747 return 0;
1748}
1749
877211f5 1750static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1da177e4
LT		 1751{
1752}
1753
b17154cf 1754static const struct action_ops snd_pcm_action_drain_init = {
1da177e4
LT		 1755 .pre_action = snd_pcm_pre_drain_init,
1756 .do_action = snd_pcm_do_drain_init,
1757 .post_action = snd_pcm_post_drain_init
1758};
1759
877211f5 1760static int snd_pcm_drop(struct snd_pcm_substream *substream);
1da177e4
LT		 1761
1762/*
1763 * Drain the stream(s).
1764 * When the substream is linked, sync until the draining of all playback streams
1765 * is finished.
1766 * After this call, all streams are supposed to be either SETUP or DRAINING
1767 * (capture only) state.
1768 */
4cdc115f
TI		 1769static int snd_pcm_drain(struct snd_pcm_substream *substream,
1770 struct file *file)
1da177e4 1771{
877211f5
TI		 1772 struct snd_card *card;
1773 struct snd_pcm_runtime *runtime;
ef991b95 1774 struct snd_pcm_substream *s;
d3a7dcfe 1775 wait_queue_t wait;
1da177e4 1776 int result = 0;
4cdc115f 1777 int nonblock = 0;
1da177e4 1778
1da177e4
LT		 1779 card = substream->pcm->card;
1780 runtime = substream->runtime;
1781
1782 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1783 return -EBADFD;
1784
4cdc115f
TI		 1785 if (file) {
1786 if (file->f_flags & O_NONBLOCK)
1787 nonblock = 1;
1788 } else if (substream->f_flags & O_NONBLOCK)
1789 nonblock = 1;
1790
21cb2a2e 1791 down_read(&snd_pcm_link_rwsem);
21cb2a2e
TI		 1792 snd_pcm_stream_lock_irq(substream);
1793 /* resume pause */
d3a7dcfe 1794 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
21cb2a2e
TI		 1795 snd_pcm_pause(substream, 0);
1796
1797 /* pre-start/stop - all running streams are changed to DRAINING state */
1798 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
4cdc115f
TI		 1799 if (result < 0)
1800 goto unlock;
1801 /* in non-blocking, we don't wait in ioctl but let caller poll */
1802 if (nonblock) {
1803 result = -EAGAIN;
1804 goto unlock;
21cb2a2e 1805 }
1da177e4
LT		 1806
1807 for (;;) {
1808 long tout;
d3a7dcfe 1809 struct snd_pcm_runtime *to_check;
1da177e4
LT		 1810 if (signal_pending(current)) {
1811 result = -ERESTARTSYS;
1812 break;
1813 }
d3a7dcfe
TI		 1814 /* find a substream to drain */
1815 to_check = NULL;
1816 snd_pcm_group_for_each_entry(s, substream) {
1817 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1818 continue;
1819 runtime = s->runtime;
1820 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1821 to_check = runtime;
21cb2a2e 1822 break;
d3a7dcfe 1823 }
21cb2a2e 1824 }
d3a7dcfe
TI		 1825 if (!to_check)
1826 break; /* all drained */
1827 init_waitqueue_entry(&wait, current);
1828 add_wait_queue(&to_check->sleep, &wait);
1da177e4 1829 snd_pcm_stream_unlock_irq(substream);
d3a7dcfe 1830 up_read(&snd_pcm_link_rwsem);
1da177e4 1831 snd_power_unlock(card);
f2b3614c
TI		 1832 if (runtime->no_period_wakeup)
1833 tout = MAX_SCHEDULE_TIMEOUT;
1834 else {
1835 tout = 10;
1836 if (runtime->rate) {
1837 long t = runtime->period_size * 2 / runtime->rate;
1838 tout = max(t, tout);
1839 }
1840 tout = msecs_to_jiffies(tout * 1000);
1841 }
1842 tout = schedule_timeout_interruptible(tout);
1da177e4 1843 snd_power_lock(card);
d3a7dcfe 1844 down_read(&snd_pcm_link_rwsem);
1da177e4 1845 snd_pcm_stream_lock_irq(substream);
d3a7dcfe 1846 remove_wait_queue(&to_check->sleep, &wait);
0914f796
TI		 1847 if (card->shutdown) {
1848 result = -ENODEV;
1849 break;
1850 }
1da177e4
LT		 1851 if (tout == 0) {
1852 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1853 result = -ESTRPIPE;
1854 else {
09e56df8
TI		 1855 dev_dbg(substream->pcm->card->dev,
1856 "playback drain error (DMA or IRQ trouble?)\n");
1da177e4
LT		 1857 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1858 result = -EIO;
1859 }
1860 break;
1861 }
1da177e4 1862 }
21cb2a2e 1863
4cdc115f 1864 unlock:
21cb2a2e 1865 snd_pcm_stream_unlock_irq(substream);
d3a7dcfe 1866 up_read(&snd_pcm_link_rwsem);
1da177e4
LT		 1867
1868 return result;
1869}
1870
1871/*
1872 * drop ioctl
1873 *
1874 * Immediately put all linked substreams into SETUP state.
1875 */
877211f5 1876static int snd_pcm_drop(struct snd_pcm_substream *substream)
1da177e4 1877{
877211f5 1878 struct snd_pcm_runtime *runtime;
1da177e4
LT		 1879 int result = 0;
1880
7eaa943c
TI		 1881 if (PCM_RUNTIME_CHECK(substream))
1882 return -ENXIO;
1da177e4 1883 runtime = substream->runtime;
1da177e4 1884
de1b8b93 1885 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
24e8fc49
TI		 1886 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1887 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1da177e4
LT		 1888 return -EBADFD;
1889
1da177e4
LT		 1890 snd_pcm_stream_lock_irq(substream);
1891 /* resume pause */
1892 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1893 snd_pcm_pause(substream, 0);
1894
1895 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1896 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1897 snd_pcm_stream_unlock_irq(substream);
24e8fc49 1898
1da177e4
LT		 1899 return result;
1900}
1901
1902
0888c321 1903static bool is_pcm_file(struct file *file)
1da177e4 1904{
0888c321 1905 struct inode *inode = file_inode(file);
f87135f5
CL		 1906 unsigned int minor;
1907
0888c321
AV		 1908 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1909 return false;
1da177e4 1910 minor = iminor(inode);
0888c321
AV		 1911 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1912 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1da177e4
LT		 1913}
1914
1915/*
1916 * PCM link handling
1917 */
877211f5 1918static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1da177e4
LT		 1919{
1920 int res = 0;
877211f5
TI		 1921 struct snd_pcm_file *pcm_file;
1922 struct snd_pcm_substream *substream1;
1662591b 1923 struct snd_pcm_group *group;
0888c321 1924 struct fd f = fdget(fd);
1da177e4 1925
0888c321 1926 if (!f.file)
1da177e4 1927 return -EBADFD;
0888c321
AV		 1928 if (!is_pcm_file(f.file)) {
1929 res = -EBADFD;
1930 goto _badf;
1931 }
1932 pcm_file = f.file->private_data;
1da177e4 1933 substream1 = pcm_file->substream;
1662591b
TI		 1934 group = kmalloc(sizeof(*group), GFP_KERNEL);
1935 if (!group) {
1936 res = -ENOMEM;
1937 goto _nolock;
1938 }
67ec1072 1939 down_write_nonblock(&snd_pcm_link_rwsem);
1da177e4
LT		 1940 write_lock_irq(&snd_pcm_link_rwlock);
1941 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
257f8cce
TI		 1942 substream->runtime->status->state != substream1->runtime->status->state ||
1943 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1da177e4
LT		 1944 res = -EBADFD;
1945 goto _end;
1946 }
1947 if (snd_pcm_stream_linked(substream1)) {
1948 res = -EALREADY;
1949 goto _end;
1950 }
1951 if (!snd_pcm_stream_linked(substream)) {
1662591b 1952 substream->group = group;
dd6c5cd8 1953 group = NULL;
1da177e4 1954 spin_lock_init(&substream->group->lock);
257f8cce 1955 mutex_init(&substream->group->mutex);
1da177e4
LT		 1956 INIT_LIST_HEAD(&substream->group->substreams);
1957 list_add_tail(&substream->link_list, &substream->group->substreams);
1958 substream->group->count = 1;
1959 }
1960 list_add_tail(&substream1->link_list, &substream->group->substreams);
1961 substream->group->count++;
1962 substream1->group = substream->group;
1963 _end:
1964 write_unlock_irq(&snd_pcm_link_rwlock);
1965 up_write(&snd_pcm_link_rwsem);
1662591b 1966 _nolock:
a0830dbd 1967 snd_card_unref(substream1->pcm->card);
dd6c5cd8 1968 kfree(group);
0888c321
AV		 1969 _badf:
1970 fdput(f);
1da177e4
LT		 1971 return res;
1972}
1973
877211f5 1974static void relink_to_local(struct snd_pcm_substream *substream)
1da177e4
LT		 1975{
1976 substream->group = &substream->self_group;
1977 INIT_LIST_HEAD(&substream->self_group.substreams);
1978 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1979}
1980
877211f5 1981static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1da177e4 1982{
ef991b95 1983 struct snd_pcm_substream *s;
1da177e4
LT		 1984 int res = 0;
1985
67ec1072 1986 down_write_nonblock(&snd_pcm_link_rwsem);
1da177e4
LT		 1987 write_lock_irq(&snd_pcm_link_rwlock);
1988 if (!snd_pcm_stream_linked(substream)) {
1989 res = -EALREADY;
1990 goto _end;
1991 }
1992 list_del(&substream->link_list);
1993 substream->group->count--;
1994 if (substream->group->count == 1) { /* detach the last stream, too */
ef991b95
TI		 1995 snd_pcm_group_for_each_entry(s, substream) {
1996 relink_to_local(s);
1da177e4
LT		 1997 break;
1998 }
1999 kfree(substream->group);
2000 }
2001 relink_to_local(substream);
2002 _end:
2003 write_unlock_irq(&snd_pcm_link_rwlock);
2004 up_write(&snd_pcm_link_rwsem);
2005 return res;
2006}
2007
2008/*
2009 * hw configurator
2010 */
877211f5
TI		 2011static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2012 struct snd_pcm_hw_rule *rule)
1da177e4 2013{
877211f5 2014 struct snd_interval t;
1da177e4
LT		 2015 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2016 hw_param_interval_c(params, rule->deps[1]), &t);
2017 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2018}
2019
877211f5
TI		 2020static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2021 struct snd_pcm_hw_rule *rule)
1da177e4 2022{
877211f5 2023 struct snd_interval t;
1da177e4
LT		 2024 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2025 hw_param_interval_c(params, rule->deps[1]), &t);
2026 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2027}
2028
877211f5
TI		 2029static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2030 struct snd_pcm_hw_rule *rule)
1da177e4 2031{
877211f5 2032 struct snd_interval t;
1da177e4
LT		 2033 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2034 hw_param_interval_c(params, rule->deps[1]),
2035 (unsigned long) rule->private, &t);
2036 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2037}
2038
877211f5
TI		 2039static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2040 struct snd_pcm_hw_rule *rule)
1da177e4 2041{
877211f5 2042 struct snd_interval t;
1da177e4
LT		 2043 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2044 (unsigned long) rule->private,
2045 hw_param_interval_c(params, rule->deps[1]), &t);
2046 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2047}
2048
877211f5
TI		 2049static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2050 struct snd_pcm_hw_rule *rule)
1da177e4
LT		 2051{
2052 unsigned int k;
b55f9fdc
TS		 2053 const struct snd_interval *i =
2054 hw_param_interval_c(params, rule->deps[0]);
877211f5
TI		 2055 struct snd_mask m;
2056 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1da177e4
LT		 2057 snd_mask_any(&m);
2058 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2059 int bits;
2060 if (! snd_mask_test(mask, k))
2061 continue;
2062 bits = snd_pcm_format_physical_width(k);
2063 if (bits <= 0)
2064 continue; /* ignore invalid formats */
2065 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2066 snd_mask_reset(&m, k);
2067 }
2068 return snd_mask_refine(mask, &m);
2069}
2070
877211f5
TI		 2071static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2072 struct snd_pcm_hw_rule *rule)
1da177e4 2073{
877211f5 2074 struct snd_interval t;
1da177e4
LT		 2075 unsigned int k;
2076 t.min = UINT_MAX;
2077 t.max = 0;
2078 t.openmin = 0;
2079 t.openmax = 0;
2080 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2081 int bits;
2082 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2083 continue;
2084 bits = snd_pcm_format_physical_width(k);
2085 if (bits <= 0)
2086 continue; /* ignore invalid formats */
2087 if (t.min > (unsigned)bits)
2088 t.min = bits;
2089 if (t.max < (unsigned)bits)
2090 t.max = bits;
2091 }
2092 t.integer = 1;
2093 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2094}
2095
2096#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2097#error "Change this table"
2098#endif
2099
8b674308
TS		 2100static const unsigned int rates[] = {
2101 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2102 48000, 64000, 88200, 96000, 176400, 192000
2103};
1da177e4 2104
7653d557
CL		 2105const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2106 .count = ARRAY_SIZE(rates),
2107 .list = rates,
2108};
2109
877211f5
TI		 2110static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2111 struct snd_pcm_hw_rule *rule)
1da177e4 2112{
877211f5 2113 struct snd_pcm_hardware *hw = rule->private;
1da177e4 2114 return snd_interval_list(hw_param_interval(params, rule->var),
7653d557
CL		 2115 snd_pcm_known_rates.count,
2116 snd_pcm_known_rates.list, hw->rates);
1da177e4
LT		 2117}
2118
877211f5
TI		 2119static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2120 struct snd_pcm_hw_rule *rule)
1da177e4 2121{
877211f5
TI		 2122 struct snd_interval t;
2123 struct snd_pcm_substream *substream = rule->private;
1da177e4
LT		 2124 t.min = 0;
2125 t.max = substream->buffer_bytes_max;
2126 t.openmin = 0;
2127 t.openmax = 0;
2128 t.integer = 1;
2129 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2130}
2131
877211f5 2132int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1da177e4 2133{
877211f5
TI		 2134 struct snd_pcm_runtime *runtime = substream->runtime;
2135 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1da177e4
LT		 2136 int k, err;
2137
2138 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2139 snd_mask_any(constrs_mask(constrs, k));
2140 }
2141
2142 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2143 snd_interval_any(constrs_interval(constrs, k));
2144 }
2145
2146 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2147 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2148 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2151
2152 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2153 snd_pcm_hw_rule_format, NULL,
2154 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2155 if (err < 0)
2156 return err;
2157 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2158 snd_pcm_hw_rule_sample_bits, NULL,
2159 SNDRV_PCM_HW_PARAM_FORMAT,
2160 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2161 if (err < 0)
2162 return err;
2163 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2164 snd_pcm_hw_rule_div, NULL,
2165 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2166 if (err < 0)
2167 return err;
2168 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2169 snd_pcm_hw_rule_mul, NULL,
2170 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2171 if (err < 0)
2172 return err;
2173 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2174 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2175 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2176 if (err < 0)
2177 return err;
2178 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2179 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2180 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2181 if (err < 0)
2182 return err;
2183 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2184 snd_pcm_hw_rule_div, NULL,
2185 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2186 if (err < 0)
2187 return err;
2188 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2189 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2190 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2191 if (err < 0)
2192 return err;
2193 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2194 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2195 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2196 if (err < 0)
2197 return err;
2198 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2199 snd_pcm_hw_rule_div, NULL,
2200 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2201 if (err < 0)
2202 return err;
2203 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2204 snd_pcm_hw_rule_div, NULL,
2205 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2206 if (err < 0)
2207 return err;
2208 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2209 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2210 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2211 if (err < 0)
2212 return err;
2213 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2214 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2215 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2216 if (err < 0)
2217 return err;
2218 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2219 snd_pcm_hw_rule_mul, NULL,
2220 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2221 if (err < 0)
2222 return err;
2223 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2224 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2225 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2226 if (err < 0)
2227 return err;
2228 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2229 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2230 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2231 if (err < 0)
2232 return err;
2233 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2234 snd_pcm_hw_rule_muldivk, (void*) 8,
2235 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2236 if (err < 0)
2237 return err;
2238 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2239 snd_pcm_hw_rule_muldivk, (void*) 8,
2240 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2241 if (err < 0)
2242 return err;
2243 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2244 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2245 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2246 if (err < 0)
2247 return err;
2248 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2249 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2250 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2251 if (err < 0)
2252 return err;
2253 return 0;
2254}
2255
877211f5 2256int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1da177e4 2257{
877211f5
TI		 2258 struct snd_pcm_runtime *runtime = substream->runtime;
2259 struct snd_pcm_hardware *hw = &runtime->hw;
1da177e4
LT		 2260 int err;
2261 unsigned int mask = 0;
2262
2263 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2264 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2265 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2266 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
63825f3a 2267 if (hw_support_mmap(substream)) {
1da177e4
LT		 2268 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2269 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2270 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2271 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2272 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2273 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2274 }
2275 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
7eaa943c
TI		 2276 if (err < 0)
2277 return err;
1da177e4
LT		 2278
2279 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
7eaa943c
TI		 2280 if (err < 0)
2281 return err;
1da177e4
LT		 2282
2283 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
7eaa943c
TI		 2284 if (err < 0)
2285 return err;
1da177e4
LT		 2286
2287 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2288 hw->channels_min, hw->channels_max);
7eaa943c
TI		 2289 if (err < 0)
2290 return err;
1da177e4
LT		 2291
2292 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2293 hw->rate_min, hw->rate_max);
8b90ca08
GL		 2294 if (err < 0)
2295 return err;
1da177e4
LT		 2296
2297 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2298 hw->period_bytes_min, hw->period_bytes_max);
8b90ca08
GL		 2299 if (err < 0)
2300 return err;
1da177e4
LT		 2301
2302 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2303 hw->periods_min, hw->periods_max);
7eaa943c
TI		 2304 if (err < 0)
2305 return err;
1da177e4
LT		 2306
2307 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2308 hw->period_bytes_min, hw->buffer_bytes_max);
7eaa943c
TI		 2309 if (err < 0)
2310 return err;
1da177e4
LT		 2311
2312 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2313 snd_pcm_hw_rule_buffer_bytes_max, substream,
2314 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2315 if (err < 0)
2316 return err;
2317
2318 /* FIXME: remove */
2319 if (runtime->dma_bytes) {
2320 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
7eaa943c 2321 if (err < 0)
6cf95152 2322 return err;
1da177e4
LT		 2323 }
2324
2325 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2326 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2327 snd_pcm_hw_rule_rate, hw,
2328 SNDRV_PCM_HW_PARAM_RATE, -1);
2329 if (err < 0)
2330 return err;
2331 }
2332
2333 /* FIXME: this belong to lowlevel */
1da177e4
LT		 2334 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2335
2336 return 0;
2337}
2338
3bf75f9b 2339static void pcm_release_private(struct snd_pcm_substream *substream)
1da177e4 2340{
1da177e4 2341 snd_pcm_unlink(substream);
3bf75f9b
TI		 2342}
2343
2344void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2345{
0df63e44
TI		 2346 substream->ref_count--;
2347 if (substream->ref_count > 0)
2348 return;
2349
3bf75f9b 2350 snd_pcm_drop(substream);
3bf75f9b 2351 if (substream->hw_opened) {
094435d4
TI		 2352 if (substream->ops->hw_free &&
2353 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
1da177e4
LT		 2354 substream->ops->hw_free(substream);
2355 substream->ops->close(substream);
3bf75f9b 2356 substream->hw_opened = 0;
1da177e4 2357 }
8699a0b6
TI		 2358 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2359 pm_qos_remove_request(&substream->latency_pm_qos_req);
1576274d
TI		 2360 if (substream->pcm_release) {
2361 substream->pcm_release(substream);
2362 substream->pcm_release = NULL;
2363 }
3bf75f9b
TI		 2364 snd_pcm_detach_substream(substream);
2365}
2366
e88e8ae6
TI		 2367EXPORT_SYMBOL(snd_pcm_release_substream);
2368
3bf75f9b
TI		 2369int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2370 struct file *file,
2371 struct snd_pcm_substream **rsubstream)
2372{
2373 struct snd_pcm_substream *substream;
2374 int err;
2375
2376 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2377 if (err < 0)
2378 return err;
0df63e44
TI		 2379 if (substream->ref_count > 1) {
2380 *rsubstream = substream;
2381 return 0;
2382 }
2383
3bf75f9b
TI		 2384 err = snd_pcm_hw_constraints_init(substream);
2385 if (err < 0) {
09e56df8 2386 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
3bf75f9b
TI		 2387 goto error;
2388 }
2389
2390 if ((err = substream->ops->open(substream)) < 0)
2391 goto error;
2392
2393 substream->hw_opened = 1;
2394
2395 err = snd_pcm_hw_constraints_complete(substream);
2396 if (err < 0) {
09e56df8 2397 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
3bf75f9b
TI		 2398 goto error;
2399 }
2400
2401 *rsubstream = substream;
1da177e4 2402 return 0;
3bf75f9b
TI		 2403
2404 error:
2405 snd_pcm_release_substream(substream);
2406 return err;
1da177e4
LT		 2407}
2408
e88e8ae6
TI		 2409EXPORT_SYMBOL(snd_pcm_open_substream);
2410
1da177e4 2411static int snd_pcm_open_file(struct file *file,
877211f5 2412 struct snd_pcm *pcm,
ffd3d5c6 2413 int stream)
1da177e4 2414{
877211f5
TI		 2415 struct snd_pcm_file *pcm_file;
2416 struct snd_pcm_substream *substream;
3bf75f9b 2417 int err;
1da177e4 2418
3bf75f9b
TI		 2419 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2420 if (err < 0)
2421 return err;
2422
548a648b
TI		 2423 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2424 if (pcm_file == NULL) {
2425 snd_pcm_release_substream(substream);
2426 return -ENOMEM;
2427 }
2428 pcm_file->substream = substream;
2429 if (substream->ref_count == 1) {
0df63e44
TI		 2430 substream->file = pcm_file;
2431 substream->pcm_release = pcm_release_private;
1da177e4 2432 }
1da177e4 2433 file->private_data = pcm_file;
ffd3d5c6 2434
1da177e4
LT		 2435 return 0;
2436}
2437
f87135f5
CL		 2438static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2439{
2440 struct snd_pcm *pcm;
02f4865f
TI		 2441 int err = nonseekable_open(inode, file);
2442 if (err < 0)
2443 return err;
f87135f5
CL		 2444 pcm = snd_lookup_minor_data(iminor(inode),
2445 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
a0830dbd 2446 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
8bb4d9ce
TI		 2447 if (pcm)
2448 snd_card_unref(pcm->card);
a0830dbd 2449 return err;
f87135f5
CL		 2450}
2451
2452static int snd_pcm_capture_open(struct inode *inode, struct file *file)
1da177e4 2453{
877211f5 2454 struct snd_pcm *pcm;
02f4865f
TI		 2455 int err = nonseekable_open(inode, file);
2456 if (err < 0)
2457 return err;
f87135f5
CL		 2458 pcm = snd_lookup_minor_data(iminor(inode),
2459 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
a0830dbd 2460 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
8bb4d9ce
TI		 2461 if (pcm)
2462 snd_card_unref(pcm->card);
a0830dbd 2463 return err;
f87135f5
CL		 2464}
2465
2466static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2467{
2468 int err;
1da177e4
LT		 2469 wait_queue_t wait;
2470
1da177e4
LT		 2471 if (pcm == NULL) {
2472 err = -ENODEV;
2473 goto __error1;
2474 }
2475 err = snd_card_file_add(pcm->card, file);
2476 if (err < 0)
2477 goto __error1;
2478 if (!try_module_get(pcm->card->module)) {
2479 err = -EFAULT;
2480 goto __error2;
2481 }
2482 init_waitqueue_entry(&wait, current);
2483 add_wait_queue(&pcm->open_wait, &wait);
1a60d4c5 2484 mutex_lock(&pcm->open_mutex);
1da177e4 2485 while (1) {
ffd3d5c6 2486 err = snd_pcm_open_file(file, pcm, stream);
1da177e4
LT		 2487 if (err >= 0)
2488 break;
2489 if (err == -EAGAIN) {
2490 if (file->f_flags & O_NONBLOCK) {
2491 err = -EBUSY;
2492 break;
2493 }
2494 } else
2495 break;
2496 set_current_state(TASK_INTERRUPTIBLE);
1a60d4c5 2497 mutex_unlock(&pcm->open_mutex);
1da177e4 2498 schedule();
1a60d4c5 2499 mutex_lock(&pcm->open_mutex);
0914f796
TI		 2500 if (pcm->card->shutdown) {
2501 err = -ENODEV;
2502 break;
2503 }
1da177e4
LT		 2504 if (signal_pending(current)) {
2505 err = -ERESTARTSYS;
2506 break;
2507 }
2508 }
2509 remove_wait_queue(&pcm->open_wait, &wait);
1a60d4c5 2510 mutex_unlock(&pcm->open_mutex);
1da177e4
LT		 2511 if (err < 0)
2512 goto __error;
2513 return err;
2514
2515 __error:
2516 module_put(pcm->card->module);
2517 __error2:
2518 snd_card_file_remove(pcm->card, file);
2519 __error1:
2520 return err;
2521}
2522
2523static int snd_pcm_release(struct inode *inode, struct file *file)
2524{
877211f5
TI		 2525 struct snd_pcm *pcm;
2526 struct snd_pcm_substream *substream;
2527 struct snd_pcm_file *pcm_file;
1da177e4
LT		 2528
2529 pcm_file = file->private_data;
2530 substream = pcm_file->substream;
7eaa943c
TI		 2531 if (snd_BUG_ON(!substream))
2532 return -ENXIO;
1da177e4 2533 pcm = substream->pcm;
1a60d4c5 2534 mutex_lock(&pcm->open_mutex);
3bf75f9b 2535 snd_pcm_release_substream(substream);
548a648b 2536 kfree(pcm_file);
1a60d4c5 2537 mutex_unlock(&pcm->open_mutex);
1da177e4
LT		 2538 wake_up(&pcm->open_wait);
2539 module_put(pcm->card->module);
2540 snd_card_file_remove(pcm->card, file);
2541 return 0;
2542}
2543
f839cc1c
TI		 2544/* check and update PCM state; return 0 or a negative error
2545 * call this inside PCM lock
2546 */
2547static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2548{
2549 switch (substream->runtime->status->state) {
2550 case SNDRV_PCM_STATE_DRAINING:
2551 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2552 return -EBADFD;
2553 /* Fall through */
2554 case SNDRV_PCM_STATE_RUNNING:
2555 return snd_pcm_update_hw_ptr(substream);
2556 case SNDRV_PCM_STATE_PREPARED:
2557 case SNDRV_PCM_STATE_PAUSED:
2558 return 0;
2559 case SNDRV_PCM_STATE_SUSPENDED:
2560 return -ESTRPIPE;
2561 case SNDRV_PCM_STATE_XRUN:
2562 return -EPIPE;
2563 default:
2564 return -EBADFD;
2565 }
2566}
2567
9027c463 2568/* increase the appl_ptr; returns the processed frames or a negative error */
e0327a0f
TI		 2569static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2570 snd_pcm_uframes_t frames,
2571 snd_pcm_sframes_t avail)
2572{
2573 struct snd_pcm_runtime *runtime = substream->runtime;
2574 snd_pcm_sframes_t appl_ptr;
9027c463 2575 int ret;
e0327a0f
TI		 2576
2577 if (avail <= 0)
2578 return 0;
2579 if (frames > (snd_pcm_uframes_t)avail)
2580 frames = avail;
2581 appl_ptr = runtime->control->appl_ptr + frames;
2582 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2583 appl_ptr -= runtime->boundary;
66e01a5c 2584 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
9027c463 2585 return ret < 0 ? ret : frames;
e0327a0f
TI		 2586}
2587
9027c463 2588/* decrease the appl_ptr; returns the processed frames or a negative error */
e0327a0f
TI		 2589static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2590 snd_pcm_uframes_t frames,
2591 snd_pcm_sframes_t avail)
2592{
2593 struct snd_pcm_runtime *runtime = substream->runtime;
2594 snd_pcm_sframes_t appl_ptr;
9027c463 2595 int ret;
e0327a0f
TI		 2596
2597 if (avail <= 0)
2598 return 0;
2599 if (frames > (snd_pcm_uframes_t)avail)
2600 frames = avail;
2601 appl_ptr = runtime->control->appl_ptr - frames;
2602 if (appl_ptr < 0)
2603 appl_ptr += runtime->boundary;
66e01a5c 2604 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
9027c463 2605 return ret < 0 ? ret : frames;
e0327a0f
TI		 2606}
2607
877211f5
TI		 2608static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2609 snd_pcm_uframes_t frames)
1da177e4 2610{
877211f5 2611 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 2612 snd_pcm_sframes_t ret;
1da177e4
LT		 2613
2614 if (frames == 0)
2615 return 0;
2616
2617 snd_pcm_stream_lock_irq(substream);
f839cc1c 2618 ret = do_pcm_hwsync(substream);
e0327a0f
TI		 2619 if (!ret)
2620 ret = rewind_appl_ptr(substream, frames,
2621 snd_pcm_playback_hw_avail(runtime));
1da177e4
LT		 2622 snd_pcm_stream_unlock_irq(substream);
2623 return ret;
2624}
2625
877211f5
TI		 2626static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2627 snd_pcm_uframes_t frames)
1da177e4 2628{
877211f5 2629 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 2630 snd_pcm_sframes_t ret;
1da177e4
LT		 2631
2632 if (frames == 0)
2633 return 0;
2634
2635 snd_pcm_stream_lock_irq(substream);
f839cc1c 2636 ret = do_pcm_hwsync(substream);
e0327a0f
TI		 2637 if (!ret)
2638 ret = rewind_appl_ptr(substream, frames,
2639 snd_pcm_capture_hw_avail(runtime));
1da177e4
LT		 2640 snd_pcm_stream_unlock_irq(substream);
2641 return ret;
2642}
2643
877211f5
TI		 2644static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2645 snd_pcm_uframes_t frames)
1da177e4 2646{
877211f5 2647 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 2648 snd_pcm_sframes_t ret;
1da177e4
LT		 2649
2650 if (frames == 0)
2651 return 0;
2652
2653 snd_pcm_stream_lock_irq(substream);
f839cc1c 2654 ret = do_pcm_hwsync(substream);
e0327a0f
TI		 2655 if (!ret)
2656 ret = forward_appl_ptr(substream, frames,
2657 snd_pcm_playback_avail(runtime));
1da177e4
LT		 2658 snd_pcm_stream_unlock_irq(substream);
2659 return ret;
2660}
2661
877211f5
TI		 2662static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2663 snd_pcm_uframes_t frames)
1da177e4 2664{
877211f5 2665 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 2666 snd_pcm_sframes_t ret;
1da177e4
LT		 2667
2668 if (frames == 0)
2669 return 0;
2670
2671 snd_pcm_stream_lock_irq(substream);
f839cc1c 2672 ret = do_pcm_hwsync(substream);
e0327a0f
TI		 2673 if (!ret)
2674 ret = forward_appl_ptr(substream, frames,
2675 snd_pcm_capture_avail(runtime));
1da177e4
LT		 2676 snd_pcm_stream_unlock_irq(substream);
2677 return ret;
2678}
2679
877211f5 2680static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
1da177e4 2681{
1da177e4
LT		 2682 int err;
2683
2684 snd_pcm_stream_lock_irq(substream);
f839cc1c 2685 err = do_pcm_hwsync(substream);
1da177e4
LT		 2686 snd_pcm_stream_unlock_irq(substream);
2687 return err;
2688}
2689
c2c86a97 2690static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream)
1da177e4 2691{
877211f5 2692 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2693 int err;
2694 snd_pcm_sframes_t n = 0;
2695
2696 snd_pcm_stream_lock_irq(substream);
f839cc1c
TI		 2697 err = do_pcm_hwsync(substream);
2698 if (!err) {
1da177e4
LT		 2699 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2700 n = snd_pcm_playback_hw_avail(runtime);
2701 else
2702 n = snd_pcm_capture_avail(runtime);
4bbe1ddf 2703 n += runtime->delay;
1da177e4
LT		 2704 }
2705 snd_pcm_stream_unlock_irq(substream);
c2c86a97 2706 return err < 0 ? err : n;
1da177e4
LT		 2707}
2708
877211f5
TI		 2709static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2710 struct snd_pcm_sync_ptr __user *_sync_ptr)
1da177e4 2711{
877211f5
TI		 2712 struct snd_pcm_runtime *runtime = substream->runtime;
2713 struct snd_pcm_sync_ptr sync_ptr;
2714 volatile struct snd_pcm_mmap_status *status;
2715 volatile struct snd_pcm_mmap_control *control;
1da177e4
LT		 2716 int err;
2717
2718 memset(&sync_ptr, 0, sizeof(sync_ptr));
2719 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2720 return -EFAULT;
877211f5 2721 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
1da177e4
LT		 2722 return -EFAULT;
2723 status = runtime->status;
2724 control = runtime->control;
2725 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2726 err = snd_pcm_hwsync(substream);
2727 if (err < 0)
2728 return err;
2729 }
2730 snd_pcm_stream_lock_irq(substream);
9027c463 2731 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
66e01a5c
TS		 2732 err = pcm_lib_apply_appl_ptr(substream,
2733 sync_ptr.c.control.appl_ptr);
9027c463
TI		 2734 if (err < 0) {
2735 snd_pcm_stream_unlock_irq(substream);
2736 return err;
2737 }
2738 } else {
1da177e4 2739 sync_ptr.c.control.appl_ptr = control->appl_ptr;
9027c463 2740 }
1da177e4
LT		 2741 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2742 control->avail_min = sync_ptr.c.control.avail_min;
2743 else
2744 sync_ptr.c.control.avail_min = control->avail_min;
2745 sync_ptr.s.status.state = status->state;
2746 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2747 sync_ptr.s.status.tstamp = status->tstamp;
2748 sync_ptr.s.status.suspended_state = status->suspended_state;
2749 snd_pcm_stream_unlock_irq(substream);
2750 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2751 return -EFAULT;
2752 return 0;
2753}
b751eef1
JK		 2754
2755static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2756{
2757 struct snd_pcm_runtime *runtime = substream->runtime;
2758 int arg;
2759
2760 if (get_user(arg, _arg))
2761 return -EFAULT;
2762 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2763 return -EINVAL;
2408c219 2764 runtime->tstamp_type = arg;
b751eef1
JK		 2765 return 0;
2766}
1da177e4 2767
68b4acd3 2768static int snd_pcm_common_ioctl(struct file *file,
0df63e44 2769 struct snd_pcm_substream *substream,
1da177e4
LT		 2770 unsigned int cmd, void __user *arg)
2771{
1da177e4
LT		 2772 switch (cmd) {
2773 case SNDRV_PCM_IOCTL_PVERSION:
2774 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2775 case SNDRV_PCM_IOCTL_INFO:
2776 return snd_pcm_info_user(substream, arg);
28e9e473
JK		 2777 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2778 return 0;
b751eef1
JK		 2779 case SNDRV_PCM_IOCTL_TTSTAMP:
2780 return snd_pcm_tstamp(substream, arg);
1da177e4
LT		 2781 case SNDRV_PCM_IOCTL_HW_REFINE:
2782 return snd_pcm_hw_refine_user(substream, arg);
2783 case SNDRV_PCM_IOCTL_HW_PARAMS:
2784 return snd_pcm_hw_params_user(substream, arg);
2785 case SNDRV_PCM_IOCTL_HW_FREE:
2786 return snd_pcm_hw_free(substream);
2787 case SNDRV_PCM_IOCTL_SW_PARAMS:
2788 return snd_pcm_sw_params_user(substream, arg);
2789 case SNDRV_PCM_IOCTL_STATUS:
38ca2a4d
PLB		 2790 return snd_pcm_status_user(substream, arg, false);
2791 case SNDRV_PCM_IOCTL_STATUS_EXT:
2792 return snd_pcm_status_user(substream, arg, true);
1da177e4
LT		 2793 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2794 return snd_pcm_channel_info_user(substream, arg);
2795 case SNDRV_PCM_IOCTL_PREPARE:
0df63e44 2796 return snd_pcm_prepare(substream, file);
1da177e4
LT		 2797 case SNDRV_PCM_IOCTL_RESET:
2798 return snd_pcm_reset(substream);
2799 case SNDRV_PCM_IOCTL_START:
c2c86a97 2800 return snd_pcm_start_lock_irq(substream);
1da177e4
LT		 2801 case SNDRV_PCM_IOCTL_LINK:
2802 return snd_pcm_link(substream, (int)(unsigned long) arg);
2803 case SNDRV_PCM_IOCTL_UNLINK:
2804 return snd_pcm_unlink(substream);
2805 case SNDRV_PCM_IOCTL_RESUME:
2806 return snd_pcm_resume(substream);
2807 case SNDRV_PCM_IOCTL_XRUN:
2808 return snd_pcm_xrun(substream);
2809 case SNDRV_PCM_IOCTL_HWSYNC:
2810 return snd_pcm_hwsync(substream);
2811 case SNDRV_PCM_IOCTL_DELAY:
c2c86a97
TI		 2812 {
2813 snd_pcm_sframes_t delay = snd_pcm_delay(substream);
2814 snd_pcm_sframes_t __user *res = arg;
2815
2816 if (delay < 0)
2817 return delay;
2818 if (put_user(delay, res))
2819 return -EFAULT;
2820 return 0;
2821 }
1da177e4
LT		 2822 case SNDRV_PCM_IOCTL_SYNC_PTR:
2823 return snd_pcm_sync_ptr(substream, arg);
59d48582 2824#ifdef CONFIG_SND_SUPPORT_OLD_API
1da177e4
LT		 2825 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2826 return snd_pcm_hw_refine_old_user(substream, arg);
2827 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2828 return snd_pcm_hw_params_old_user(substream, arg);
59d48582 2829#endif
1da177e4 2830 case SNDRV_PCM_IOCTL_DRAIN:
4cdc115f 2831 return snd_pcm_drain(substream, file);
1da177e4
LT		 2832 case SNDRV_PCM_IOCTL_DROP:
2833 return snd_pcm_drop(substream);
e661d0dd 2834 case SNDRV_PCM_IOCTL_PAUSE:
34bcc44a
TI		 2835 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2836 substream,
2837 (int)(unsigned long)arg);
1da177e4 2838 }
09e56df8 2839 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
1da177e4
LT		 2840 return -ENOTTY;
2841}
2842
68b4acd3
TI		 2843static int snd_pcm_common_ioctl1(struct file *file,
2844 struct snd_pcm_substream *substream,
2845 unsigned int cmd, void __user *arg)
2846{
2847 struct snd_card *card = substream->pcm->card;
2848 int res;
2849
2850 snd_power_lock(card);
2851 res = snd_power_wait(card, SNDRV_CTL_POWER_D0);
2852 if (res >= 0)
2853 res = snd_pcm_common_ioctl(file, substream, cmd, arg);
2854 snd_power_unlock(card);
2855 return res;
2856}
2857
0df63e44
TI		 2858static int snd_pcm_playback_ioctl1(struct file *file,
2859 struct snd_pcm_substream *substream,
1da177e4
LT		 2860 unsigned int cmd, void __user *arg)
2861{
7eaa943c
TI		 2862 if (snd_BUG_ON(!substream))
2863 return -ENXIO;
2864 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2865 return -EINVAL;
1da177e4
LT		 2866 switch (cmd) {
2867 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2868 {
877211f5
TI		 2869 struct snd_xferi xferi;
2870 struct snd_xferi __user *_xferi = arg;
2871 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2872 snd_pcm_sframes_t result;
2873 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2874 return -EBADFD;
2875 if (put_user(0, &_xferi->result))
2876 return -EFAULT;
2877 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2878 return -EFAULT;
2879 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2880 __put_user(result, &_xferi->result);
2881 return result < 0 ? result : 0;
2882 }
2883 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2884 {
877211f5
TI		 2885 struct snd_xfern xfern;
2886 struct snd_xfern __user *_xfern = arg;
2887 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2888 void __user **bufs;
2889 snd_pcm_sframes_t result;
2890 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2891 return -EBADFD;
2892 if (runtime->channels > 128)
2893 return -EINVAL;
2894 if (put_user(0, &_xfern->result))
2895 return -EFAULT;
2896 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2897 return -EFAULT;
ef44a1ec
LZ		 2898
2899 bufs = memdup_user(xfern.bufs,
2900 sizeof(void *) * runtime->channels);
2901 if (IS_ERR(bufs))
2902 return PTR_ERR(bufs);
1da177e4
LT		 2903 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2904 kfree(bufs);
2905 __put_user(result, &_xfern->result);
2906 return result < 0 ? result : 0;
2907 }
2908 case SNDRV_PCM_IOCTL_REWIND:
2909 {
2910 snd_pcm_uframes_t frames;
2911 snd_pcm_uframes_t __user *_frames = arg;
2912 snd_pcm_sframes_t result;
2913 if (get_user(frames, _frames))
2914 return -EFAULT;
2915 if (put_user(0, _frames))
2916 return -EFAULT;
2917 result = snd_pcm_playback_rewind(substream, frames);
2918 __put_user(result, _frames);
2919 return result < 0 ? result : 0;
2920 }
2921 case SNDRV_PCM_IOCTL_FORWARD:
2922 {
2923 snd_pcm_uframes_t frames;
2924 snd_pcm_uframes_t __user *_frames = arg;
2925 snd_pcm_sframes_t result;
2926 if (get_user(frames, _frames))
2927 return -EFAULT;
2928 if (put_user(0, _frames))
2929 return -EFAULT;
2930 result = snd_pcm_playback_forward(substream, frames);
2931 __put_user(result, _frames);
2932 return result < 0 ? result : 0;
2933 }
1da177e4 2934 }
0df63e44 2935 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
1da177e4
LT		 2936}
2937
0df63e44
TI		 2938static int snd_pcm_capture_ioctl1(struct file *file,
2939 struct snd_pcm_substream *substream,
1da177e4
LT		 2940 unsigned int cmd, void __user *arg)
2941{
7eaa943c
TI		 2942 if (snd_BUG_ON(!substream))
2943 return -ENXIO;
2944 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2945 return -EINVAL;
1da177e4
LT		 2946 switch (cmd) {
2947 case SNDRV_PCM_IOCTL_READI_FRAMES:
2948 {
877211f5
TI		 2949 struct snd_xferi xferi;
2950 struct snd_xferi __user *_xferi = arg;
2951 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2952 snd_pcm_sframes_t result;
2953 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2954 return -EBADFD;
2955 if (put_user(0, &_xferi->result))
2956 return -EFAULT;
2957 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2958 return -EFAULT;
2959 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2960 __put_user(result, &_xferi->result);
2961 return result < 0 ? result : 0;
2962 }
2963 case SNDRV_PCM_IOCTL_READN_FRAMES:
2964 {
877211f5
TI		 2965 struct snd_xfern xfern;
2966 struct snd_xfern __user *_xfern = arg;
2967 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2968 void *bufs;
2969 snd_pcm_sframes_t result;
2970 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2971 return -EBADFD;
2972 if (runtime->channels > 128)
2973 return -EINVAL;
2974 if (put_user(0, &_xfern->result))
2975 return -EFAULT;
2976 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2977 return -EFAULT;
ef44a1ec
LZ		 2978
2979 bufs = memdup_user(xfern.bufs,
2980 sizeof(void *) * runtime->channels);
2981 if (IS_ERR(bufs))
2982 return PTR_ERR(bufs);
1da177e4
LT		 2983 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2984 kfree(bufs);
2985 __put_user(result, &_xfern->result);
2986 return result < 0 ? result : 0;
2987 }
2988 case SNDRV_PCM_IOCTL_REWIND:
2989 {
2990 snd_pcm_uframes_t frames;
2991 snd_pcm_uframes_t __user *_frames = arg;
2992 snd_pcm_sframes_t result;
2993 if (get_user(frames, _frames))
2994 return -EFAULT;
2995 if (put_user(0, _frames))
2996 return -EFAULT;
2997 result = snd_pcm_capture_rewind(substream, frames);
2998 __put_user(result, _frames);
2999 return result < 0 ? result : 0;
3000 }
3001 case SNDRV_PCM_IOCTL_FORWARD:
3002 {
3003 snd_pcm_uframes_t frames;
3004 snd_pcm_uframes_t __user *_frames = arg;
3005 snd_pcm_sframes_t result;
3006 if (get_user(frames, _frames))
3007 return -EFAULT;
3008 if (put_user(0, _frames))
3009 return -EFAULT;
3010 result = snd_pcm_capture_forward(substream, frames);
3011 __put_user(result, _frames);
3012 return result < 0 ? result : 0;
3013 }
3014 }
0df63e44 3015 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
1da177e4
LT		 3016}
3017
877211f5
TI		 3018static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
3019 unsigned long arg)
1da177e4 3020{
877211f5 3021 struct snd_pcm_file *pcm_file;
1da177e4
LT		 3022
3023 pcm_file = file->private_data;
3024
3025 if (((cmd >> 8) & 0xff) != 'A')
3026 return -ENOTTY;
3027
0df63e44
TI		 3028 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
3029 (void __user *)arg);
1da177e4
LT		 3030}
3031
877211f5
TI		 3032static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
3033 unsigned long arg)
1da177e4 3034{
877211f5 3035 struct snd_pcm_file *pcm_file;
1da177e4
LT		 3036
3037 pcm_file = file->private_data;
3038
3039 if (((cmd >> 8) & 0xff) != 'A')
3040 return -ENOTTY;
3041
0df63e44
TI		 3042 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
3043 (void __user *)arg);
1da177e4
LT		 3044}
3045
c2c86a97
TI		 3046/**
3047 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3048 * @substream: PCM substream
3049 * @cmd: IOCTL cmd
3050 * @arg: IOCTL argument
3051 *
3052 * The function is provided primarily for OSS layer and USB gadget drivers,
3053 * and it allows only the limited set of ioctls (hw_params, sw_params,
3054 * prepare, start, drain, drop, forward).
3055 */
bf1bbb5a
TI		 3056int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3057 unsigned int cmd, void *arg)
1da177e4 3058{
c2c86a97
TI		 3059 snd_pcm_uframes_t *frames = arg;
3060 snd_pcm_sframes_t result;
1da177e4 3061
c2c86a97
TI		 3062 switch (cmd) {
3063 case SNDRV_PCM_IOCTL_FORWARD:
3064 {
3065 /* provided only for OSS; capture-only and no value returned */
3066 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3067 return -EINVAL;
3068 result = snd_pcm_capture_forward(substream, *frames);
3069 return result < 0 ? result : 0;
3070 }
3071 case SNDRV_PCM_IOCTL_HW_PARAMS:
3072 return snd_pcm_hw_params(substream, arg);
3073 case SNDRV_PCM_IOCTL_SW_PARAMS:
3074 return snd_pcm_sw_params(substream, arg);
3075 case SNDRV_PCM_IOCTL_PREPARE:
3076 return snd_pcm_prepare(substream, NULL);
3077 case SNDRV_PCM_IOCTL_START:
3078 return snd_pcm_start_lock_irq(substream);
3079 case SNDRV_PCM_IOCTL_DRAIN:
3080 return snd_pcm_drain(substream, NULL);
3081 case SNDRV_PCM_IOCTL_DROP:
3082 return snd_pcm_drop(substream);
3083 case SNDRV_PCM_IOCTL_DELAY:
3084 {
3085 result = snd_pcm_delay(substream);
3086 if (result < 0)
3087 return result;
3088 *frames = result;
3089 return 0;
3090 }
1da177e4 3091 default:
c2c86a97 3092 return -EINVAL;
1da177e4
LT		 3093 }
3094}
e88e8ae6
TI		 3095EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3096
877211f5
TI		 3097static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3098 loff_t * offset)
1da177e4 3099{
877211f5
TI		 3100 struct snd_pcm_file *pcm_file;
3101 struct snd_pcm_substream *substream;
3102 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3103 snd_pcm_sframes_t result;
3104
3105 pcm_file = file->private_data;
3106 substream = pcm_file->substream;
7eaa943c
TI		 3107 if (PCM_RUNTIME_CHECK(substream))
3108 return -ENXIO;
1da177e4
LT		 3109 runtime = substream->runtime;
3110 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3111 return -EBADFD;
3112 if (!frame_aligned(runtime, count))
3113 return -EINVAL;
3114 count = bytes_to_frames(runtime, count);
3115 result = snd_pcm_lib_read(substream, buf, count);
3116 if (result > 0)
3117 result = frames_to_bytes(runtime, result);
3118 return result;
3119}
3120
877211f5
TI		 3121static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3122 size_t count, loff_t * offset)
1da177e4 3123{
877211f5
TI		 3124 struct snd_pcm_file *pcm_file;
3125 struct snd_pcm_substream *substream;
3126 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3127 snd_pcm_sframes_t result;
3128
3129 pcm_file = file->private_data;
3130 substream = pcm_file->substream;
7eaa943c
TI		 3131 if (PCM_RUNTIME_CHECK(substream))
3132 return -ENXIO;
1da177e4 3133 runtime = substream->runtime;
7eaa943c
TI		 3134 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3135 return -EBADFD;
3136 if (!frame_aligned(runtime, count))
3137 return -EINVAL;
1da177e4
LT		 3138 count = bytes_to_frames(runtime, count);
3139 result = snd_pcm_lib_write(substream, buf, count);
3140 if (result > 0)
3141 result = frames_to_bytes(runtime, result);
1da177e4
LT		 3142 return result;
3143}
3144
1c65d986 3145static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
1da177e4 3146{
877211f5
TI		 3147 struct snd_pcm_file *pcm_file;
3148 struct snd_pcm_substream *substream;
3149 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3150 snd_pcm_sframes_t result;
3151 unsigned long i;
3152 void __user **bufs;
3153 snd_pcm_uframes_t frames;
3154
ee0b3e67 3155 pcm_file = iocb->ki_filp->private_data;
1da177e4 3156 substream = pcm_file->substream;
7eaa943c
TI		 3157 if (PCM_RUNTIME_CHECK(substream))
3158 return -ENXIO;
1da177e4
LT		 3159 runtime = substream->runtime;
3160 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3161 return -EBADFD;
1c65d986
AV		 3162 if (!iter_is_iovec(to))
3163 return -EINVAL;
3164 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
1da177e4 3165 return -EINVAL;
1c65d986 3166 if (!frame_aligned(runtime, to->iov->iov_len))
1da177e4 3167 return -EINVAL;
1c65d986
AV		 3168 frames = bytes_to_samples(runtime, to->iov->iov_len);
3169 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
1da177e4
LT		 3170 if (bufs == NULL)
3171 return -ENOMEM;
1c65d986
AV		 3172 for (i = 0; i < to->nr_segs; ++i)
3173 bufs[i] = to->iov[i].iov_base;
1da177e4
LT		 3174 result = snd_pcm_lib_readv(substream, bufs, frames);
3175 if (result > 0)
3176 result = frames_to_bytes(runtime, result);
3177 kfree(bufs);
3178 return result;
3179}
3180
1c65d986 3181static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
1da177e4 3182{
877211f5
TI		 3183 struct snd_pcm_file *pcm_file;
3184 struct snd_pcm_substream *substream;
3185 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3186 snd_pcm_sframes_t result;
3187 unsigned long i;
3188 void __user **bufs;
3189 snd_pcm_uframes_t frames;
3190
ee0b3e67 3191 pcm_file = iocb->ki_filp->private_data;
1da177e4 3192 substream = pcm_file->substream;
7eaa943c
TI		 3193 if (PCM_RUNTIME_CHECK(substream))
3194 return -ENXIO;
1da177e4 3195 runtime = substream->runtime;
7eaa943c
TI		 3196 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3197 return -EBADFD;
1c65d986
AV		 3198 if (!iter_is_iovec(from))
3199 return -EINVAL;
3200 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3201 !frame_aligned(runtime, from->iov->iov_len))
7eaa943c 3202 return -EINVAL;
1c65d986
AV		 3203 frames = bytes_to_samples(runtime, from->iov->iov_len);
3204 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
1da177e4
LT		 3205 if (bufs == NULL)
3206 return -ENOMEM;
1c65d986
AV		 3207 for (i = 0; i < from->nr_segs; ++i)
3208 bufs[i] = from->iov[i].iov_base;
1da177e4
LT		 3209 result = snd_pcm_lib_writev(substream, bufs, frames);
3210 if (result > 0)
3211 result = frames_to_bytes(runtime, result);
3212 kfree(bufs);
1da177e4
LT		 3213 return result;
3214}
3215
3216static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3217{
877211f5
TI		 3218 struct snd_pcm_file *pcm_file;
3219 struct snd_pcm_substream *substream;
3220 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3221 unsigned int mask;
3222 snd_pcm_uframes_t avail;
3223
3224 pcm_file = file->private_data;
3225
3226 substream = pcm_file->substream;
7eaa943c 3227 if (PCM_RUNTIME_CHECK(substream))
e099aeea 3228 return POLLOUT | POLLWRNORM | POLLERR;
1da177e4
LT		 3229 runtime = substream->runtime;
3230
3231 poll_wait(file, &runtime->sleep, wait);
3232
3233 snd_pcm_stream_lock_irq(substream);
3234 avail = snd_pcm_playback_avail(runtime);
3235 switch (runtime->status->state) {
3236 case SNDRV_PCM_STATE_RUNNING:
3237 case SNDRV_PCM_STATE_PREPARED:
3238 case SNDRV_PCM_STATE_PAUSED:
3239 if (avail >= runtime->control->avail_min) {
3240 mask = POLLOUT | POLLWRNORM;
3241 break;
3242 }
3243 /* Fall through */
3244 case SNDRV_PCM_STATE_DRAINING:
3245 mask = 0;
3246 break;
3247 default:
3248 mask = POLLOUT | POLLWRNORM | POLLERR;
3249 break;
3250 }
3251 snd_pcm_stream_unlock_irq(substream);
3252 return mask;
3253}
3254
3255static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3256{
877211f5
TI		 3257 struct snd_pcm_file *pcm_file;
3258 struct snd_pcm_substream *substream;
3259 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3260 unsigned int mask;
3261 snd_pcm_uframes_t avail;
3262
3263 pcm_file = file->private_data;
3264
3265 substream = pcm_file->substream;
7eaa943c 3266 if (PCM_RUNTIME_CHECK(substream))
e099aeea 3267 return POLLIN | POLLRDNORM | POLLERR;
1da177e4
LT		 3268 runtime = substream->runtime;
3269
3270 poll_wait(file, &runtime->sleep, wait);
3271
3272 snd_pcm_stream_lock_irq(substream);
3273 avail = snd_pcm_capture_avail(runtime);
3274 switch (runtime->status->state) {
3275 case SNDRV_PCM_STATE_RUNNING:
3276 case SNDRV_PCM_STATE_PREPARED:
3277 case SNDRV_PCM_STATE_PAUSED:
3278 if (avail >= runtime->control->avail_min) {
3279 mask = POLLIN | POLLRDNORM;
3280 break;
3281 }
3282 mask = 0;
3283 break;
3284 case SNDRV_PCM_STATE_DRAINING:
3285 if (avail > 0) {
3286 mask = POLLIN | POLLRDNORM;
3287 break;
3288 }
3289 /* Fall through */
3290 default:
3291 mask = POLLIN | POLLRDNORM | POLLERR;
3292 break;
3293 }
3294 snd_pcm_stream_unlock_irq(substream);
3295 return mask;
3296}
3297
3298/*
3299 * mmap support
3300 */
3301
3302/*
3303 * Only on coherent architectures, we can mmap the status and the control records
3304 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3305 */
3306#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3307/*
3308 * mmap status record
3309 */
11bac800 3310static int snd_pcm_mmap_status_fault(struct vm_fault *vmf)
1da177e4 3311{
11bac800 3312 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
877211f5 3313 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3314
3315 if (substream == NULL)
3ad5afcd 3316 return VM_FAULT_SIGBUS;
1da177e4 3317 runtime = substream->runtime;
3ad5afcd
NP		 3318 vmf->page = virt_to_page(runtime->status);
3319 get_page(vmf->page);
3320 return 0;
1da177e4
LT		 3321}
3322
f0f37e2f 3323static const struct vm_operations_struct snd_pcm_vm_ops_status =
1da177e4 3324{
3ad5afcd 3325 .fault = snd_pcm_mmap_status_fault,
1da177e4
LT		 3326};
3327
877211f5 3328static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3329 struct vm_area_struct *area)
3330{
1da177e4
LT		 3331 long size;
3332 if (!(area->vm_flags & VM_READ))
3333 return -EINVAL;
1da177e4 3334 size = area->vm_end - area->vm_start;
877211f5 3335 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
1da177e4
LT		 3336 return -EINVAL;
3337 area->vm_ops = &snd_pcm_vm_ops_status;
3338 area->vm_private_data = substream;
314e51b9 3339 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 3340 return 0;
3341}
3342
3343/*
3344 * mmap control record
3345 */
11bac800 3346static int snd_pcm_mmap_control_fault(struct vm_fault *vmf)
1da177e4 3347{
11bac800 3348 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
877211f5 3349 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3350
3351 if (substream == NULL)
3ad5afcd 3352 return VM_FAULT_SIGBUS;
1da177e4 3353 runtime = substream->runtime;
3ad5afcd
NP		 3354 vmf->page = virt_to_page(runtime->control);
3355 get_page(vmf->page);
3356 return 0;
1da177e4
LT		 3357}
3358
f0f37e2f 3359static const struct vm_operations_struct snd_pcm_vm_ops_control =
1da177e4 3360{
3ad5afcd 3361 .fault = snd_pcm_mmap_control_fault,
1da177e4
LT		 3362};
3363
877211f5 3364static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3365 struct vm_area_struct *area)
3366{
1da177e4
LT		 3367 long size;
3368 if (!(area->vm_flags & VM_READ))
3369 return -EINVAL;
1da177e4 3370 size = area->vm_end - area->vm_start;
877211f5 3371 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
1da177e4
LT		 3372 return -EINVAL;
3373 area->vm_ops = &snd_pcm_vm_ops_control;
3374 area->vm_private_data = substream;
314e51b9 3375 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1da177e4
LT		 3376 return 0;
3377}
3378#else /* ! coherent mmap */
3379/*
3380 * don't support mmap for status and control records.
3381 */
877211f5 3382static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3383 struct vm_area_struct *area)
3384{
3385 return -ENXIO;
3386}
877211f5 3387static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3388 struct vm_area_struct *area)
3389{
3390 return -ENXIO;
3391}
3392#endif /* coherent mmap */
3393
9eb4a067
TI		 3394static inline struct page *
3395snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3396{
3397 void *vaddr = substream->runtime->dma_area + ofs;
3398 return virt_to_page(vaddr);
3399}
3400
1da177e4 3401/*
3ad5afcd 3402 * fault callback for mmapping a RAM page
1da177e4 3403 */
11bac800 3404static int snd_pcm_mmap_data_fault(struct vm_fault *vmf)
1da177e4 3405{
11bac800 3406 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
877211f5 3407 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3408 unsigned long offset;
3409 struct page * page;
1da177e4
LT		 3410 size_t dma_bytes;
3411
3412 if (substream == NULL)
3ad5afcd 3413 return VM_FAULT_SIGBUS;
1da177e4 3414 runtime = substream->runtime;
3ad5afcd 3415 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4
LT		 3416 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3417 if (offset > dma_bytes - PAGE_SIZE)
3ad5afcd 3418 return VM_FAULT_SIGBUS;
9eb4a067 3419 if (substream->ops->page)
1da177e4 3420 page = substream->ops->page(substream, offset);
9eb4a067
TI		 3421 else
3422 page = snd_pcm_default_page_ops(substream, offset);
3423 if (!page)
3424 return VM_FAULT_SIGBUS;
b5810039 3425 get_page(page);
3ad5afcd
NP		 3426 vmf->page = page;
3427 return 0;
1da177e4
LT		 3428}
3429
657b1989
TI		 3430static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3431 .open = snd_pcm_mmap_data_open,
3432 .close = snd_pcm_mmap_data_close,
3433};
3434
3435static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
1da177e4
LT		 3436 .open = snd_pcm_mmap_data_open,
3437 .close = snd_pcm_mmap_data_close,
3ad5afcd 3438 .fault = snd_pcm_mmap_data_fault,
1da177e4
LT		 3439};
3440
3441/*
3442 * mmap the DMA buffer on RAM
3443 */
30b771cf
TI		 3444
3445/**
3446 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3447 * @substream: PCM substream
3448 * @area: VMA
3449 *
3450 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3451 * this function is invoked implicitly.
3452 */
18a2b962
TI		 3453int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3454 struct vm_area_struct *area)
1da177e4 3455{
314e51b9 3456 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
a5606f85 3457#ifdef CONFIG_GENERIC_ALLOCATOR
05503214
NC		 3458 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3459 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3460 return remap_pfn_range(area, area->vm_start,
3461 substream->dma_buffer.addr >> PAGE_SHIFT,
3462 area->vm_end - area->vm_start, area->vm_page_prot);
3463 }
a5606f85 3464#endif /* CONFIG_GENERIC_ALLOCATOR */
49d776ff 3465#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
657b1989
TI		 3466 if (!substream->ops->page &&
3467 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3468 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3469 area,
3470 substream->runtime->dma_area,
3471 substream->runtime->dma_addr,
3472 area->vm_end - area->vm_start);
49d776ff 3473#endif /* CONFIG_X86 */
657b1989
TI		 3474 /* mmap with fault handler */
3475 area->vm_ops = &snd_pcm_vm_ops_data_fault;
1da177e4
LT		 3476 return 0;
3477}
18a2b962 3478EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
1da177e4
LT		 3479
3480/*
3481 * mmap the DMA buffer on I/O memory area
3482 */
3483#if SNDRV_PCM_INFO_MMAP_IOMEM
30b771cf
TI		 3484/**
3485 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3486 * @substream: PCM substream
3487 * @area: VMA
3488 *
3489 * When your hardware uses the iomapped pages as the hardware buffer and
3490 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3491 * is supposed to work only on limited architectures.
3492 */
877211f5
TI		 3493int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3494 struct vm_area_struct *area)
1da177e4 3495{
0fe09a45 3496 struct snd_pcm_runtime *runtime = substream->runtime;;
1da177e4 3497
1da177e4 3498 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
0fe09a45 3499 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
1da177e4 3500}
e88e8ae6
TI		 3501
3502EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1da177e4
LT		 3503#endif /* SNDRV_PCM_INFO_MMAP */
3504
3505/*
3506 * mmap DMA buffer
3507 */
877211f5 3508int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
1da177e4
LT		 3509 struct vm_area_struct *area)
3510{
877211f5 3511 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3512 long size;
3513 unsigned long offset;
3514 size_t dma_bytes;
657b1989 3515 int err;
1da177e4
LT		 3516
3517 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3518 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3519 return -EINVAL;
3520 } else {
3521 if (!(area->vm_flags & VM_READ))
3522 return -EINVAL;
3523 }
3524 runtime = substream->runtime;
1da177e4
LT		 3525 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3526 return -EBADFD;
3527 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3528 return -ENXIO;
3529 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3530 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3531 return -EINVAL;
3532 size = area->vm_end - area->vm_start;
3533 offset = area->vm_pgoff << PAGE_SHIFT;
3534 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3535 if ((size_t)size > dma_bytes)
3536 return -EINVAL;
3537 if (offset > dma_bytes - size)
3538 return -EINVAL;
3539
657b1989
TI		 3540 area->vm_ops = &snd_pcm_vm_ops_data;
3541 area->vm_private_data = substream;
1da177e4 3542 if (substream->ops->mmap)
657b1989 3543 err = substream->ops->mmap(substream, area);
1da177e4 3544 else
18a2b962 3545 err = snd_pcm_lib_default_mmap(substream, area);
657b1989
TI		 3546 if (!err)
3547 atomic_inc(&substream->mmap_count);
3548 return err;
1da177e4
LT		 3549}
3550
e88e8ae6
TI		 3551EXPORT_SYMBOL(snd_pcm_mmap_data);
3552
1da177e4
LT		 3553static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3554{
877211f5
TI		 3555 struct snd_pcm_file * pcm_file;
3556 struct snd_pcm_substream *substream;
1da177e4
LT		 3557 unsigned long offset;
3558
3559 pcm_file = file->private_data;
3560 substream = pcm_file->substream;
7eaa943c
TI		 3561 if (PCM_RUNTIME_CHECK(substream))
3562 return -ENXIO;
1da177e4
LT		 3563
3564 offset = area->vm_pgoff << PAGE_SHIFT;
3565 switch (offset) {
3566 case SNDRV_PCM_MMAP_OFFSET_STATUS:
548a648b 3567 if (pcm_file->no_compat_mmap)
1da177e4
LT		 3568 return -ENXIO;
3569 return snd_pcm_mmap_status(substream, file, area);
3570 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
548a648b 3571 if (pcm_file->no_compat_mmap)
1da177e4
LT		 3572 return -ENXIO;
3573 return snd_pcm_mmap_control(substream, file, area);
3574 default:
3575 return snd_pcm_mmap_data(substream, file, area);
3576 }
3577 return 0;
3578}
3579
3580static int snd_pcm_fasync(int fd, struct file * file, int on)
3581{
877211f5
TI		 3582 struct snd_pcm_file * pcm_file;
3583 struct snd_pcm_substream *substream;
3584 struct snd_pcm_runtime *runtime;
1da177e4
LT		 3585
3586 pcm_file = file->private_data;
3587 substream = pcm_file->substream;
7eaa943c 3588 if (PCM_RUNTIME_CHECK(substream))
d05468b7 3589 return -ENXIO;
1da177e4 3590 runtime = substream->runtime;
d05468b7 3591 return fasync_helper(fd, file, on, &runtime->fasync);
1da177e4
LT		 3592}
3593
3594/*
3595 * ioctl32 compat
3596 */
3597#ifdef CONFIG_COMPAT
3598#include "pcm_compat.c"
3599#else
3600#define snd_pcm_ioctl_compat NULL
3601#endif
3602
3603/*
3604 * To be removed helpers to keep binary compatibility
3605 */
3606
59d48582 3607#ifdef CONFIG_SND_SUPPORT_OLD_API
1da177e4
LT		 3608#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3609#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3610
877211f5
TI		 3611static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3612 struct snd_pcm_hw_params_old *oparams)
1da177e4
LT		 3613{
3614 unsigned int i;
3615
3616 memset(params, 0, sizeof(*params));
3617 params->flags = oparams->flags;
3618 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3619 params->masks[i].bits[0] = oparams->masks[i];
3620 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3621 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3622 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3623 params->info = oparams->info;
3624 params->msbits = oparams->msbits;
3625 params->rate_num = oparams->rate_num;
3626 params->rate_den = oparams->rate_den;
3627 params->fifo_size = oparams->fifo_size;
3628}
3629
877211f5
TI		 3630static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3631 struct snd_pcm_hw_params *params)
1da177e4
LT		 3632{
3633 unsigned int i;
3634
3635 memset(oparams, 0, sizeof(*oparams));
3636 oparams->flags = params->flags;
3637 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3638 oparams->masks[i] = params->masks[i].bits[0];
3639 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3640 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3641 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3642 oparams->info = params->info;
3643 oparams->msbits = params->msbits;
3644 oparams->rate_num = params->rate_num;
3645 oparams->rate_den = params->rate_den;
3646 oparams->fifo_size = params->fifo_size;
3647}
3648
877211f5
TI		 3649static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3650 struct snd_pcm_hw_params_old __user * _oparams)
1da177e4 3651{
877211f5
TI		 3652 struct snd_pcm_hw_params *params;
3653 struct snd_pcm_hw_params_old *oparams = NULL;
1da177e4
LT		 3654 int err;
3655
3656 params = kmalloc(sizeof(*params), GFP_KERNEL);
ef44a1ec
LZ		 3657 if (!params)
3658 return -ENOMEM;
1da177e4 3659
ef44a1ec
LZ		 3660 oparams = memdup_user(_oparams, sizeof(*oparams));
3661 if (IS_ERR(oparams)) {
3662 err = PTR_ERR(oparams);
1da177e4
LT		 3663 goto out;
3664 }
3665 snd_pcm_hw_convert_from_old_params(params, oparams);
3666 err = snd_pcm_hw_refine(substream, params);
f74ae15f
TS		 3667 if (err < 0)
3668 goto out_old;
3669
3670 err = fixup_unreferenced_params(substream, params);
3671 if (err < 0)
3672 goto out_old;
ef44a1ec 3673
f74ae15f
TS		 3674 snd_pcm_hw_convert_to_old_params(oparams, params);
3675 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3676 err = -EFAULT;
3677out_old:
ef44a1ec 3678 kfree(oparams);
1da177e4
LT		 3679out:
3680 kfree(params);
1da177e4
LT		 3681 return err;
3682}
3683
877211f5
TI		 3684static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3685 struct snd_pcm_hw_params_old __user * _oparams)
1da177e4 3686{
877211f5
TI		 3687 struct snd_pcm_hw_params *params;
3688 struct snd_pcm_hw_params_old *oparams = NULL;
1da177e4
LT		 3689 int err;
3690
3691 params = kmalloc(sizeof(*params), GFP_KERNEL);
ef44a1ec
LZ		 3692 if (!params)
3693 return -ENOMEM;
3694
3695 oparams = memdup_user(_oparams, sizeof(*oparams));
3696 if (IS_ERR(oparams)) {
3697 err = PTR_ERR(oparams);
1da177e4
LT		 3698 goto out;
3699 }
f74ae15f 3700
1da177e4
LT		 3701 snd_pcm_hw_convert_from_old_params(params, oparams);
3702 err = snd_pcm_hw_params(substream, params);
f74ae15f
TS		 3703 if (err < 0)
3704 goto out_old;
ef44a1ec 3705
f74ae15f
TS		 3706 snd_pcm_hw_convert_to_old_params(oparams, params);
3707 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3708 err = -EFAULT;
3709out_old:
ef44a1ec 3710 kfree(oparams);
1da177e4
LT		 3711out:
3712 kfree(params);
1da177e4
LT		 3713 return err;
3714}
59d48582 3715#endif /* CONFIG_SND_SUPPORT_OLD_API */
1da177e4 3716
7003609b 3717#ifndef CONFIG_MMU
55c63bd2
DG		 3718static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3719 unsigned long addr,
3720 unsigned long len,
3721 unsigned long pgoff,
3722 unsigned long flags)
3723{
3724 struct snd_pcm_file *pcm_file = file->private_data;
3725 struct snd_pcm_substream *substream = pcm_file->substream;
3726 struct snd_pcm_runtime *runtime = substream->runtime;
3727 unsigned long offset = pgoff << PAGE_SHIFT;
3728
3729 switch (offset) {
3730 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3731 return (unsigned long)runtime->status;
3732 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3733 return (unsigned long)runtime->control;
3734 default:
3735 return (unsigned long)runtime->dma_area + offset;
3736 }
7003609b
CC		 3737}
3738#else
55c63bd2 3739# define snd_pcm_get_unmapped_area NULL
7003609b
CC		 3740#endif
3741
1da177e4
LT		 3742/*
3743 * Register section
3744 */
3745
9c2e08c5 3746const struct file_operations snd_pcm_f_ops[2] = {
1da177e4 3747 {
2af677fc
CL		 3748 .owner = THIS_MODULE,
3749 .write = snd_pcm_write,
1c65d986 3750 .write_iter = snd_pcm_writev,
f87135f5 3751 .open = snd_pcm_playback_open,
2af677fc 3752 .release = snd_pcm_release,
02f4865f 3753 .llseek = no_llseek,
2af677fc
CL		 3754 .poll = snd_pcm_playback_poll,
3755 .unlocked_ioctl = snd_pcm_playback_ioctl,
3756 .compat_ioctl = snd_pcm_ioctl_compat,
3757 .mmap = snd_pcm_mmap,
3758 .fasync = snd_pcm_fasync,
55c63bd2 3759 .get_unmapped_area = snd_pcm_get_unmapped_area,
1da177e4
LT		 3760 },
3761 {
2af677fc
CL		 3762 .owner = THIS_MODULE,
3763 .read = snd_pcm_read,
1c65d986 3764 .read_iter = snd_pcm_readv,
f87135f5 3765 .open = snd_pcm_capture_open,
2af677fc 3766 .release = snd_pcm_release,
02f4865f 3767 .llseek = no_llseek,
2af677fc
CL		 3768 .poll = snd_pcm_capture_poll,
3769 .unlocked_ioctl = snd_pcm_capture_ioctl,
3770 .compat_ioctl = snd_pcm_ioctl_compat,
3771 .mmap = snd_pcm_mmap,
3772 .fasync = snd_pcm_fasync,
55c63bd2 3773 .get_unmapped_area = snd_pcm_get_unmapped_area,
1da177e4
LT		 3774 }
3775};
Linux 6.x block layer and io_uring tree(s)