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kselftest: Move the docs to the Documentation dir
[linux/fpc-iii.git] / sound / core / pcm_native.c
blob166d59cdc86b3e178d7656f510a43983bfd34e19
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos.h>
28 #include <linux/aio.h>
29 #include <linux/dma-mapping.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <asm/io.h>
38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39 #include <dma-coherence.h>
40 #endif
41
42 /*
43 * Compatibility
44 */
45
46 struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60 };
61
62 #ifdef CONFIG_SND_SUPPORT_OLD_API
63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70 #endif
71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73 /*
74 *
75 */
76
77 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
78 static DECLARE_RWSEM(snd_pcm_link_rwsem);
79
80 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
81 {
82 if (substream->pcm->nonatomic) {
83 down_read(&snd_pcm_link_rwsem);
84 mutex_lock(&substream->self_group.mutex);
85 } else {
86 read_lock(&snd_pcm_link_rwlock);
87 spin_lock(&substream->self_group.lock);
88 }
89 }
90 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
91
92 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
93 {
94 if (substream->pcm->nonatomic) {
95 mutex_unlock(&substream->self_group.mutex);
96 up_read(&snd_pcm_link_rwsem);
97 } else {
98 spin_unlock(&substream->self_group.lock);
99 read_unlock(&snd_pcm_link_rwlock);
100 }
101 }
102 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
103
104 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
105 {
106 if (!substream->pcm->nonatomic)
107 local_irq_disable();
108 snd_pcm_stream_lock(substream);
109 }
110 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
111
112 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
113 {
114 snd_pcm_stream_unlock(substream);
115 if (!substream->pcm->nonatomic)
116 local_irq_enable();
117 }
118 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
119
120 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
121 {
122 unsigned long flags = 0;
123 if (!substream->pcm->nonatomic)
124 local_irq_save(flags);
125 snd_pcm_stream_lock(substream);
126 return flags;
127 }
128 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
129
130 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
131 unsigned long flags)
132 {
133 snd_pcm_stream_unlock(substream);
134 if (!substream->pcm->nonatomic)
135 local_irq_restore(flags);
136 }
137 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
138
139 static inline mm_segment_t snd_enter_user(void)
140 {
141 mm_segment_t fs = get_fs();
142 set_fs(get_ds());
143 return fs;
144 }
145
146 static inline void snd_leave_user(mm_segment_t fs)
147 {
148 set_fs(fs);
149 }
150
151
152
153 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
154 {
155 struct snd_pcm_runtime *runtime;
156 struct snd_pcm *pcm = substream->pcm;
157 struct snd_pcm_str *pstr = substream->pstr;
158
159 memset(info, 0, sizeof(*info));
160 info->card = pcm->card->number;
161 info->device = pcm->device;
162 info->stream = substream->stream;
163 info->subdevice = substream->number;
164 strlcpy(info->id, pcm->id, sizeof(info->id));
165 strlcpy(info->name, pcm->name, sizeof(info->name));
166 info->dev_class = pcm->dev_class;
167 info->dev_subclass = pcm->dev_subclass;
168 info->subdevices_count = pstr->substream_count;
169 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
170 strlcpy(info->subname, substream->name, sizeof(info->subname));
171 runtime = substream->runtime;
172 /* AB: FIXME!!! This is definitely nonsense */
173 if (runtime) {
174 info->sync = runtime->sync;
175 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
176 }
177 return 0;
178 }
179
180 int snd_pcm_info_user(struct snd_pcm_substream *substream,
181 struct snd_pcm_info __user * _info)
182 {
183 struct snd_pcm_info *info;
184 int err;
185
186 info = kmalloc(sizeof(*info), GFP_KERNEL);
187 if (! info)
188 return -ENOMEM;
189 err = snd_pcm_info(substream, info);
190 if (err >= 0) {
191 if (copy_to_user(_info, info, sizeof(*info)))
192 err = -EFAULT;
193 }
194 kfree(info);
195 return err;
196 }
197
198 #undef RULES_DEBUG
199
200 #ifdef RULES_DEBUG
201 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
202 static const char * const snd_pcm_hw_param_names[] = {
203 HW_PARAM(ACCESS),
204 HW_PARAM(FORMAT),
205 HW_PARAM(SUBFORMAT),
206 HW_PARAM(SAMPLE_BITS),
207 HW_PARAM(FRAME_BITS),
208 HW_PARAM(CHANNELS),
209 HW_PARAM(RATE),
210 HW_PARAM(PERIOD_TIME),
211 HW_PARAM(PERIOD_SIZE),
212 HW_PARAM(PERIOD_BYTES),
213 HW_PARAM(PERIODS),
214 HW_PARAM(BUFFER_TIME),
215 HW_PARAM(BUFFER_SIZE),
216 HW_PARAM(BUFFER_BYTES),
217 HW_PARAM(TICK_TIME),
218 };
219 #endif
220
221 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
222 struct snd_pcm_hw_params *params)
223 {
224 unsigned int k;
225 struct snd_pcm_hardware *hw;
226 struct snd_interval *i = NULL;
227 struct snd_mask *m = NULL;
228 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
229 unsigned int rstamps[constrs->rules_num];
230 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
231 unsigned int stamp = 2;
232 int changed, again;
233
234 params->info = 0;
235 params->fifo_size = 0;
236 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
237 params->msbits = 0;
238 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
239 params->rate_num = 0;
240 params->rate_den = 0;
241 }
242
243 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
244 m = hw_param_mask(params, k);
245 if (snd_mask_empty(m))
246 return -EINVAL;
247 if (!(params->rmask & (1 << k)))
248 continue;
249 #ifdef RULES_DEBUG
250 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
251 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
252 #endif
253 changed = snd_mask_refine(m, constrs_mask(constrs, k));
254 #ifdef RULES_DEBUG
255 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
256 #endif
257 if (changed)
258 params->cmask |= 1 << k;
259 if (changed < 0)
260 return changed;
261 }
262
263 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
264 i = hw_param_interval(params, k);
265 if (snd_interval_empty(i))
266 return -EINVAL;
267 if (!(params->rmask & (1 << k)))
268 continue;
269 #ifdef RULES_DEBUG
270 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
271 if (i->empty)
272 pr_cont("empty");
273 else
274 pr_cont("%c%u %u%c",
275 i->openmin ? '(' : '[', i->min,
276 i->max, i->openmax ? ')' : ']');
277 pr_cont(" -> ");
278 #endif
279 changed = snd_interval_refine(i, constrs_interval(constrs, k));
280 #ifdef RULES_DEBUG
281 if (i->empty)
282 pr_cont("empty\n");
283 else
284 pr_cont("%c%u %u%c\n",
285 i->openmin ? '(' : '[', i->min,
286 i->max, i->openmax ? ')' : ']');
287 #endif
288 if (changed)
289 params->cmask |= 1 << k;
290 if (changed < 0)
291 return changed;
292 }
293
294 for (k = 0; k < constrs->rules_num; k++)
295 rstamps[k] = 0;
296 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
297 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
298 do {
299 again = 0;
300 for (k = 0; k < constrs->rules_num; k++) {
301 struct snd_pcm_hw_rule *r = &constrs->rules[k];
302 unsigned int d;
303 int doit = 0;
304 if (r->cond && !(r->cond & params->flags))
305 continue;
306 for (d = 0; r->deps[d] >= 0; d++) {
307 if (vstamps[r->deps[d]] > rstamps[k]) {
308 doit = 1;
309 break;
310 }
311 }
312 if (!doit)
313 continue;
314 #ifdef RULES_DEBUG
315 pr_debug("Rule %d [%p]: ", k, r->func);
316 if (r->var >= 0) {
317 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
318 if (hw_is_mask(r->var)) {
319 m = hw_param_mask(params, r->var);
320 pr_cont("%x", *m->bits);
321 } else {
322 i = hw_param_interval(params, r->var);
323 if (i->empty)
324 pr_cont("empty");
325 else
326 pr_cont("%c%u %u%c",
327 i->openmin ? '(' : '[', i->min,
328 i->max, i->openmax ? ')' : ']');
329 }
330 }
331 #endif
332 changed = r->func(params, r);
333 #ifdef RULES_DEBUG
334 if (r->var >= 0) {
335 pr_cont(" -> ");
336 if (hw_is_mask(r->var))
337 pr_cont("%x", *m->bits);
338 else {
339 if (i->empty)
340 pr_cont("empty");
341 else
342 pr_cont("%c%u %u%c",
343 i->openmin ? '(' : '[', i->min,
344 i->max, i->openmax ? ')' : ']');
345 }
346 }
347 pr_cont("\n");
348 #endif
349 rstamps[k] = stamp;
350 if (changed && r->var >= 0) {
351 params->cmask |= (1 << r->var);
352 vstamps[r->var] = stamp;
353 again = 1;
354 }
355 if (changed < 0)
356 return changed;
357 stamp++;
358 }
359 } while (again);
360 if (!params->msbits) {
361 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
362 if (snd_interval_single(i))
363 params->msbits = snd_interval_value(i);
364 }
365
366 if (!params->rate_den) {
367 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
368 if (snd_interval_single(i)) {
369 params->rate_num = snd_interval_value(i);
370 params->rate_den = 1;
371 }
372 }
373
374 hw = &substream->runtime->hw;
375 if (!params->info)
376 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
377 if (!params->fifo_size) {
378 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
379 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
380 if (snd_mask_min(m) == snd_mask_max(m) &&
381 snd_interval_min(i) == snd_interval_max(i)) {
382 changed = substream->ops->ioctl(substream,
383 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
384 if (changed < 0)
385 return changed;
386 }
387 }
388 params->rmask = 0;
389 return 0;
390 }
391
392 EXPORT_SYMBOL(snd_pcm_hw_refine);
393
394 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
395 struct snd_pcm_hw_params __user * _params)
396 {
397 struct snd_pcm_hw_params *params;
398 int err;
399
400 params = memdup_user(_params, sizeof(*params));
401 if (IS_ERR(params))
402 return PTR_ERR(params);
403
404 err = snd_pcm_hw_refine(substream, params);
405 if (copy_to_user(_params, params, sizeof(*params))) {
406 if (!err)
407 err = -EFAULT;
408 }
409
410 kfree(params);
411 return err;
412 }
413
414 static int period_to_usecs(struct snd_pcm_runtime *runtime)
415 {
416 int usecs;
417
418 if (! runtime->rate)
419 return -1; /* invalid */
420
421 /* take 75% of period time as the deadline */
422 usecs = (750000 / runtime->rate) * runtime->period_size;
423 usecs += ((750000 % runtime->rate) * runtime->period_size) /
424 runtime->rate;
425
426 return usecs;
427 }
428
429 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
430 {
431 snd_pcm_stream_lock_irq(substream);
432 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
433 substream->runtime->status->state = state;
434 snd_pcm_stream_unlock_irq(substream);
435 }
436
437 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
438 struct snd_pcm_hw_params *params)
439 {
440 struct snd_pcm_runtime *runtime;
441 int err, usecs;
442 unsigned int bits;
443 snd_pcm_uframes_t frames;
444
445 if (PCM_RUNTIME_CHECK(substream))
446 return -ENXIO;
447 runtime = substream->runtime;
448 snd_pcm_stream_lock_irq(substream);
449 switch (runtime->status->state) {
450 case SNDRV_PCM_STATE_OPEN:
451 case SNDRV_PCM_STATE_SETUP:
452 case SNDRV_PCM_STATE_PREPARED:
453 break;
454 default:
455 snd_pcm_stream_unlock_irq(substream);
456 return -EBADFD;
457 }
458 snd_pcm_stream_unlock_irq(substream);
459 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
460 if (!substream->oss.oss)
461 #endif
462 if (atomic_read(&substream->mmap_count))
463 return -EBADFD;
464
465 params->rmask = ~0U;
466 err = snd_pcm_hw_refine(substream, params);
467 if (err < 0)
468 goto _error;
469
470 err = snd_pcm_hw_params_choose(substream, params);
471 if (err < 0)
472 goto _error;
473
474 if (substream->ops->hw_params != NULL) {
475 err = substream->ops->hw_params(substream, params);
476 if (err < 0)
477 goto _error;
478 }
479
480 runtime->access = params_access(params);
481 runtime->format = params_format(params);
482 runtime->subformat = params_subformat(params);
483 runtime->channels = params_channels(params);
484 runtime->rate = params_rate(params);
485 runtime->period_size = params_period_size(params);
486 runtime->periods = params_periods(params);
487 runtime->buffer_size = params_buffer_size(params);
488 runtime->info = params->info;
489 runtime->rate_num = params->rate_num;
490 runtime->rate_den = params->rate_den;
491 runtime->no_period_wakeup =
492 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
493 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
494
495 bits = snd_pcm_format_physical_width(runtime->format);
496 runtime->sample_bits = bits;
497 bits *= runtime->channels;
498 runtime->frame_bits = bits;
499 frames = 1;
500 while (bits % 8 != 0) {
501 bits *= 2;
502 frames *= 2;
503 }
504 runtime->byte_align = bits / 8;
505 runtime->min_align = frames;
506
507 /* Default sw params */
508 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
509 runtime->period_step = 1;
510 runtime->control->avail_min = runtime->period_size;
511 runtime->start_threshold = 1;
512 runtime->stop_threshold = runtime->buffer_size;
513 runtime->silence_threshold = 0;
514 runtime->silence_size = 0;
515 runtime->boundary = runtime->buffer_size;
516 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
517 runtime->boundary *= 2;
518
519 snd_pcm_timer_resolution_change(substream);
520 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
521
522 if (pm_qos_request_active(&substream->latency_pm_qos_req))
523 pm_qos_remove_request(&substream->latency_pm_qos_req);
524 if ((usecs = period_to_usecs(runtime)) >= 0)
525 pm_qos_add_request(&substream->latency_pm_qos_req,
526 PM_QOS_CPU_DMA_LATENCY, usecs);
527 return 0;
528 _error:
529 /* hardware might be unusable from this time,
530 so we force application to retry to set
531 the correct hardware parameter settings */
532 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
533 if (substream->ops->hw_free != NULL)
534 substream->ops->hw_free(substream);
535 return err;
536 }
537
538 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
539 struct snd_pcm_hw_params __user * _params)
540 {
541 struct snd_pcm_hw_params *params;
542 int err;
543
544 params = memdup_user(_params, sizeof(*params));
545 if (IS_ERR(params))
546 return PTR_ERR(params);
547
548 err = snd_pcm_hw_params(substream, params);
549 if (copy_to_user(_params, params, sizeof(*params))) {
550 if (!err)
551 err = -EFAULT;
552 }
553
554 kfree(params);
555 return err;
556 }
557
558 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
559 {
560 struct snd_pcm_runtime *runtime;
561 int result = 0;
562
563 if (PCM_RUNTIME_CHECK(substream))
564 return -ENXIO;
565 runtime = substream->runtime;
566 snd_pcm_stream_lock_irq(substream);
567 switch (runtime->status->state) {
568 case SNDRV_PCM_STATE_SETUP:
569 case SNDRV_PCM_STATE_PREPARED:
570 break;
571 default:
572 snd_pcm_stream_unlock_irq(substream);
573 return -EBADFD;
574 }
575 snd_pcm_stream_unlock_irq(substream);
576 if (atomic_read(&substream->mmap_count))
577 return -EBADFD;
578 if (substream->ops->hw_free)
579 result = substream->ops->hw_free(substream);
580 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
581 pm_qos_remove_request(&substream->latency_pm_qos_req);
582 return result;
583 }
584
585 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
586 struct snd_pcm_sw_params *params)
587 {
588 struct snd_pcm_runtime *runtime;
589 int err;
590
591 if (PCM_RUNTIME_CHECK(substream))
592 return -ENXIO;
593 runtime = substream->runtime;
594 snd_pcm_stream_lock_irq(substream);
595 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
596 snd_pcm_stream_unlock_irq(substream);
597 return -EBADFD;
598 }
599 snd_pcm_stream_unlock_irq(substream);
600
601 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
602 return -EINVAL;
603 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
604 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
605 return -EINVAL;
606 if (params->avail_min == 0)
607 return -EINVAL;
608 if (params->silence_size >= runtime->boundary) {
609 if (params->silence_threshold != 0)
610 return -EINVAL;
611 } else {
612 if (params->silence_size > params->silence_threshold)
613 return -EINVAL;
614 if (params->silence_threshold > runtime->buffer_size)
615 return -EINVAL;
616 }
617 err = 0;
618 snd_pcm_stream_lock_irq(substream);
619 runtime->tstamp_mode = params->tstamp_mode;
620 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
621 runtime->tstamp_type = params->tstamp_type;
622 runtime->period_step = params->period_step;
623 runtime->control->avail_min = params->avail_min;
624 runtime->start_threshold = params->start_threshold;
625 runtime->stop_threshold = params->stop_threshold;
626 runtime->silence_threshold = params->silence_threshold;
627 runtime->silence_size = params->silence_size;
628 params->boundary = runtime->boundary;
629 if (snd_pcm_running(substream)) {
630 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
631 runtime->silence_size > 0)
632 snd_pcm_playback_silence(substream, ULONG_MAX);
633 err = snd_pcm_update_state(substream, runtime);
634 }
635 snd_pcm_stream_unlock_irq(substream);
636 return err;
637 }
638
639 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
640 struct snd_pcm_sw_params __user * _params)
641 {
642 struct snd_pcm_sw_params params;
643 int err;
644 if (copy_from_user(&params, _params, sizeof(params)))
645 return -EFAULT;
646 err = snd_pcm_sw_params(substream, &params);
647 if (copy_to_user(_params, &params, sizeof(params)))
648 return -EFAULT;
649 return err;
650 }
651
652 int snd_pcm_status(struct snd_pcm_substream *substream,
653 struct snd_pcm_status *status)
654 {
655 struct snd_pcm_runtime *runtime = substream->runtime;
656
657 snd_pcm_stream_lock_irq(substream);
658 status->state = runtime->status->state;
659 status->suspended_state = runtime->status->suspended_state;
660 if (status->state == SNDRV_PCM_STATE_OPEN)
661 goto _end;
662 status->trigger_tstamp = runtime->trigger_tstamp;
663 if (snd_pcm_running(substream)) {
664 snd_pcm_update_hw_ptr(substream);
665 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
666 status->tstamp = runtime->status->tstamp;
667 status->audio_tstamp =
668 runtime->status->audio_tstamp;
669 goto _tstamp_end;
670 }
671 }
672 snd_pcm_gettime(runtime, &status->tstamp);
673 _tstamp_end:
674 status->appl_ptr = runtime->control->appl_ptr;
675 status->hw_ptr = runtime->status->hw_ptr;
676 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
677 status->avail = snd_pcm_playback_avail(runtime);
678 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
679 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
680 status->delay = runtime->buffer_size - status->avail;
681 status->delay += runtime->delay;
682 } else
683 status->delay = 0;
684 } else {
685 status->avail = snd_pcm_capture_avail(runtime);
686 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
687 status->delay = status->avail + runtime->delay;
688 else
689 status->delay = 0;
690 }
691 status->avail_max = runtime->avail_max;
692 status->overrange = runtime->overrange;
693 runtime->avail_max = 0;
694 runtime->overrange = 0;
695 _end:
696 snd_pcm_stream_unlock_irq(substream);
697 return 0;
698 }
699
700 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
701 struct snd_pcm_status __user * _status)
702 {
703 struct snd_pcm_status status;
704 int res;
705
706 memset(&status, 0, sizeof(status));
707 res = snd_pcm_status(substream, &status);
708 if (res < 0)
709 return res;
710 if (copy_to_user(_status, &status, sizeof(status)))
711 return -EFAULT;
712 return 0;
713 }
714
715 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
716 struct snd_pcm_channel_info * info)
717 {
718 struct snd_pcm_runtime *runtime;
719 unsigned int channel;
720
721 channel = info->channel;
722 runtime = substream->runtime;
723 snd_pcm_stream_lock_irq(substream);
724 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
725 snd_pcm_stream_unlock_irq(substream);
726 return -EBADFD;
727 }
728 snd_pcm_stream_unlock_irq(substream);
729 if (channel >= runtime->channels)
730 return -EINVAL;
731 memset(info, 0, sizeof(*info));
732 info->channel = channel;
733 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
734 }
735
736 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
737 struct snd_pcm_channel_info __user * _info)
738 {
739 struct snd_pcm_channel_info info;
740 int res;
741
742 if (copy_from_user(&info, _info, sizeof(info)))
743 return -EFAULT;
744 res = snd_pcm_channel_info(substream, &info);
745 if (res < 0)
746 return res;
747 if (copy_to_user(_info, &info, sizeof(info)))
748 return -EFAULT;
749 return 0;
750 }
751
752 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
753 {
754 struct snd_pcm_runtime *runtime = substream->runtime;
755 if (runtime->trigger_master == NULL)
756 return;
757 if (runtime->trigger_master == substream) {
758 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
759 } else {
760 snd_pcm_trigger_tstamp(runtime->trigger_master);
761 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
762 }
763 runtime->trigger_master = NULL;
764 }
765
766 struct action_ops {
767 int (*pre_action)(struct snd_pcm_substream *substream, int state);
768 int (*do_action)(struct snd_pcm_substream *substream, int state);
769 void (*undo_action)(struct snd_pcm_substream *substream, int state);
770 void (*post_action)(struct snd_pcm_substream *substream, int state);
771 };
772
773 /*
774 * this functions is core for handling of linked stream
775 * Note: the stream state might be changed also on failure
776 * Note2: call with calling stream lock + link lock
777 */
778 static int snd_pcm_action_group(struct action_ops *ops,
779 struct snd_pcm_substream *substream,
780 int state, int do_lock)
781 {
782 struct snd_pcm_substream *s = NULL;
783 struct snd_pcm_substream *s1;
784 int res = 0, depth = 1;
785
786 snd_pcm_group_for_each_entry(s, substream) {
787 if (do_lock && s != substream) {
788 if (s->pcm->nonatomic)
789 mutex_lock_nested(&s->self_group.mutex, depth);
790 else
791 spin_lock_nested(&s->self_group.lock, depth);
792 depth++;
793 }
794 res = ops->pre_action(s, state);
795 if (res < 0)
796 goto _unlock;
797 }
798 snd_pcm_group_for_each_entry(s, substream) {
799 res = ops->do_action(s, state);
800 if (res < 0) {
801 if (ops->undo_action) {
802 snd_pcm_group_for_each_entry(s1, substream) {
803 if (s1 == s) /* failed stream */
804 break;
805 ops->undo_action(s1, state);
806 }
807 }
808 s = NULL; /* unlock all */
809 goto _unlock;
810 }
811 }
812 snd_pcm_group_for_each_entry(s, substream) {
813 ops->post_action(s, state);
814 }
815 _unlock:
816 if (do_lock) {
817 /* unlock streams */
818 snd_pcm_group_for_each_entry(s1, substream) {
819 if (s1 != substream) {
820 if (s1->pcm->nonatomic)
821 mutex_unlock(&s1->self_group.mutex);
822 else
823 spin_unlock(&s1->self_group.lock);
824 }
825 if (s1 == s) /* end */
826 break;
827 }
828 }
829 return res;
830 }
831
832 /*
833 * Note: call with stream lock
834 */
835 static int snd_pcm_action_single(struct action_ops *ops,
836 struct snd_pcm_substream *substream,
837 int state)
838 {
839 int res;
840
841 res = ops->pre_action(substream, state);
842 if (res < 0)
843 return res;
844 res = ops->do_action(substream, state);
845 if (res == 0)
846 ops->post_action(substream, state);
847 else if (ops->undo_action)
848 ops->undo_action(substream, state);
849 return res;
850 }
851
852 /* call in mutex-protected context */
853 static int snd_pcm_action_mutex(struct action_ops *ops,
854 struct snd_pcm_substream *substream,
855 int state)
856 {
857 int res;
858
859 if (snd_pcm_stream_linked(substream)) {
860 if (!mutex_trylock(&substream->group->mutex)) {
861 mutex_unlock(&substream->self_group.mutex);
862 mutex_lock(&substream->group->mutex);
863 mutex_lock(&substream->self_group.mutex);
864 }
865 res = snd_pcm_action_group(ops, substream, state, 1);
866 mutex_unlock(&substream->group->mutex);
867 } else {
868 res = snd_pcm_action_single(ops, substream, state);
869 }
870 return res;
871 }
872
873 /*
874 * Note: call with stream lock
875 */
876 static int snd_pcm_action(struct action_ops *ops,
877 struct snd_pcm_substream *substream,
878 int state)
879 {
880 int res;
881
882 if (substream->pcm->nonatomic)
883 return snd_pcm_action_mutex(ops, substream, state);
884
885 if (snd_pcm_stream_linked(substream)) {
886 if (!spin_trylock(&substream->group->lock)) {
887 spin_unlock(&substream->self_group.lock);
888 spin_lock(&substream->group->lock);
889 spin_lock(&substream->self_group.lock);
890 }
891 res = snd_pcm_action_group(ops, substream, state, 1);
892 spin_unlock(&substream->group->lock);
893 } else {
894 res = snd_pcm_action_single(ops, substream, state);
895 }
896 return res;
897 }
898
899 static int snd_pcm_action_lock_mutex(struct action_ops *ops,
900 struct snd_pcm_substream *substream,
901 int state)
902 {
903 int res;
904
905 down_read(&snd_pcm_link_rwsem);
906 if (snd_pcm_stream_linked(substream)) {
907 mutex_lock(&substream->group->mutex);
908 mutex_lock(&substream->self_group.mutex);
909 res = snd_pcm_action_group(ops, substream, state, 1);
910 mutex_unlock(&substream->self_group.mutex);
911 mutex_unlock(&substream->group->mutex);
912 } else {
913 mutex_lock(&substream->self_group.mutex);
914 res = snd_pcm_action_single(ops, substream, state);
915 mutex_unlock(&substream->self_group.mutex);
916 }
917 up_read(&snd_pcm_link_rwsem);
918 return res;
919 }
920
921 /*
922 * Note: don't use any locks before
923 */
924 static int snd_pcm_action_lock_irq(struct action_ops *ops,
925 struct snd_pcm_substream *substream,
926 int state)
927 {
928 int res;
929
930 if (substream->pcm->nonatomic)
931 return snd_pcm_action_lock_mutex(ops, substream, state);
932
933 read_lock_irq(&snd_pcm_link_rwlock);
934 if (snd_pcm_stream_linked(substream)) {
935 spin_lock(&substream->group->lock);
936 spin_lock(&substream->self_group.lock);
937 res = snd_pcm_action_group(ops, substream, state, 1);
938 spin_unlock(&substream->self_group.lock);
939 spin_unlock(&substream->group->lock);
940 } else {
941 spin_lock(&substream->self_group.lock);
942 res = snd_pcm_action_single(ops, substream, state);
943 spin_unlock(&substream->self_group.lock);
944 }
945 read_unlock_irq(&snd_pcm_link_rwlock);
946 return res;
947 }
948
949 /*
950 */
951 static int snd_pcm_action_nonatomic(struct action_ops *ops,
952 struct snd_pcm_substream *substream,
953 int state)
954 {
955 int res;
956
957 down_read(&snd_pcm_link_rwsem);
958 if (snd_pcm_stream_linked(substream))
959 res = snd_pcm_action_group(ops, substream, state, 0);
960 else
961 res = snd_pcm_action_single(ops, substream, state);
962 up_read(&snd_pcm_link_rwsem);
963 return res;
964 }
965
966 /*
967 * start callbacks
968 */
969 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
970 {
971 struct snd_pcm_runtime *runtime = substream->runtime;
972 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
973 return -EBADFD;
974 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
975 !snd_pcm_playback_data(substream))
976 return -EPIPE;
977 runtime->trigger_master = substream;
978 return 0;
979 }
980
981 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
982 {
983 if (substream->runtime->trigger_master != substream)
984 return 0;
985 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
986 }
987
988 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
989 {
990 if (substream->runtime->trigger_master == substream)
991 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
992 }
993
994 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
995 {
996 struct snd_pcm_runtime *runtime = substream->runtime;
997 snd_pcm_trigger_tstamp(substream);
998 runtime->hw_ptr_jiffies = jiffies;
999 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1000 runtime->rate;
1001 runtime->status->state = state;
1002 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1003 runtime->silence_size > 0)
1004 snd_pcm_playback_silence(substream, ULONG_MAX);
1005 if (substream->timer)
1006 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
1007 &runtime->trigger_tstamp);
1008 }
1009
1010 static struct action_ops snd_pcm_action_start = {
1011 .pre_action = snd_pcm_pre_start,
1012 .do_action = snd_pcm_do_start,
1013 .undo_action = snd_pcm_undo_start,
1014 .post_action = snd_pcm_post_start
1015 };
1016
1017 /**
1018 * snd_pcm_start - start all linked streams
1019 * @substream: the PCM substream instance
1020 *
1021 * Return: Zero if successful, or a negative error code.
1022 */
1023 int snd_pcm_start(struct snd_pcm_substream *substream)
1024 {
1025 return snd_pcm_action(&snd_pcm_action_start, substream,
1026 SNDRV_PCM_STATE_RUNNING);
1027 }
1028
1029 /*
1030 * stop callbacks
1031 */
1032 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1033 {
1034 struct snd_pcm_runtime *runtime = substream->runtime;
1035 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1036 return -EBADFD;
1037 runtime->trigger_master = substream;
1038 return 0;
1039 }
1040
1041 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1042 {
1043 if (substream->runtime->trigger_master == substream &&
1044 snd_pcm_running(substream))
1045 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1046 return 0; /* unconditonally stop all substreams */
1047 }
1048
1049 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1050 {
1051 struct snd_pcm_runtime *runtime = substream->runtime;
1052 if (runtime->status->state != state) {
1053 snd_pcm_trigger_tstamp(substream);
1054 if (substream->timer)
1055 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
1056 &runtime->trigger_tstamp);
1057 runtime->status->state = state;
1058 }
1059 wake_up(&runtime->sleep);
1060 wake_up(&runtime->tsleep);
1061 }
1062
1063 static struct action_ops snd_pcm_action_stop = {
1064 .pre_action = snd_pcm_pre_stop,
1065 .do_action = snd_pcm_do_stop,
1066 .post_action = snd_pcm_post_stop
1067 };
1068
1069 /**
1070 * snd_pcm_stop - try to stop all running streams in the substream group
1071 * @substream: the PCM substream instance
1072 * @state: PCM state after stopping the stream
1073 *
1074 * The state of each stream is then changed to the given state unconditionally.
1075 *
1076 * Return: Zero if successful, or a negative error code.
1077 */
1078 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1079 {
1080 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1081 }
1082
1083 EXPORT_SYMBOL(snd_pcm_stop);
1084
1085 /**
1086 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1087 * @substream: the PCM substream
1088 *
1089 * After stopping, the state is changed to SETUP.
1090 * Unlike snd_pcm_stop(), this affects only the given stream.
1091 *
1092 * Return: Zero if succesful, or a negative error code.
1093 */
1094 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1095 {
1096 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1097 SNDRV_PCM_STATE_SETUP);
1098 }
1099
1100 /*
1101 * pause callbacks
1102 */
1103 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1104 {
1105 struct snd_pcm_runtime *runtime = substream->runtime;
1106 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1107 return -ENOSYS;
1108 if (push) {
1109 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1110 return -EBADFD;
1111 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1112 return -EBADFD;
1113 runtime->trigger_master = substream;
1114 return 0;
1115 }
1116
1117 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1118 {
1119 if (substream->runtime->trigger_master != substream)
1120 return 0;
1121 /* some drivers might use hw_ptr to recover from the pause -
1122 update the hw_ptr now */
1123 if (push)
1124 snd_pcm_update_hw_ptr(substream);
1125 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1126 * a delta between the current jiffies, this gives a large enough
1127 * delta, effectively to skip the check once.
1128 */
1129 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1130 return substream->ops->trigger(substream,
1131 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1132 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1133 }
1134
1135 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1136 {
1137 if (substream->runtime->trigger_master == substream)
1138 substream->ops->trigger(substream,
1139 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1140 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1141 }
1142
1143 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1144 {
1145 struct snd_pcm_runtime *runtime = substream->runtime;
1146 snd_pcm_trigger_tstamp(substream);
1147 if (push) {
1148 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1149 if (substream->timer)
1150 snd_timer_notify(substream->timer,
1151 SNDRV_TIMER_EVENT_MPAUSE,
1152 &runtime->trigger_tstamp);
1153 wake_up(&runtime->sleep);
1154 wake_up(&runtime->tsleep);
1155 } else {
1156 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1157 if (substream->timer)
1158 snd_timer_notify(substream->timer,
1159 SNDRV_TIMER_EVENT_MCONTINUE,
1160 &runtime->trigger_tstamp);
1161 }
1162 }
1163
1164 static struct action_ops snd_pcm_action_pause = {
1165 .pre_action = snd_pcm_pre_pause,
1166 .do_action = snd_pcm_do_pause,
1167 .undo_action = snd_pcm_undo_pause,
1168 .post_action = snd_pcm_post_pause
1169 };
1170
1171 /*
1172 * Push/release the pause for all linked streams.
1173 */
1174 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1175 {
1176 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1177 }
1178
1179 #ifdef CONFIG_PM
1180 /* suspend */
1181
1182 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1183 {
1184 struct snd_pcm_runtime *runtime = substream->runtime;
1185 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1186 return -EBUSY;
1187 runtime->trigger_master = substream;
1188 return 0;
1189 }
1190
1191 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1192 {
1193 struct snd_pcm_runtime *runtime = substream->runtime;
1194 if (runtime->trigger_master != substream)
1195 return 0;
1196 if (! snd_pcm_running(substream))
1197 return 0;
1198 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1199 return 0; /* suspend unconditionally */
1200 }
1201
1202 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1203 {
1204 struct snd_pcm_runtime *runtime = substream->runtime;
1205 snd_pcm_trigger_tstamp(substream);
1206 if (substream->timer)
1207 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1208 &runtime->trigger_tstamp);
1209 runtime->status->suspended_state = runtime->status->state;
1210 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1211 wake_up(&runtime->sleep);
1212 wake_up(&runtime->tsleep);
1213 }
1214
1215 static struct action_ops snd_pcm_action_suspend = {
1216 .pre_action = snd_pcm_pre_suspend,
1217 .do_action = snd_pcm_do_suspend,
1218 .post_action = snd_pcm_post_suspend
1219 };
1220
1221 /**
1222 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1223 * @substream: the PCM substream
1224 *
1225 * After this call, all streams are changed to SUSPENDED state.
1226 *
1227 * Return: Zero if successful (or @substream is %NULL), or a negative error
1228 * code.
1229 */
1230 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1231 {
1232 int err;
1233 unsigned long flags;
1234
1235 if (! substream)
1236 return 0;
1237
1238 snd_pcm_stream_lock_irqsave(substream, flags);
1239 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1240 snd_pcm_stream_unlock_irqrestore(substream, flags);
1241 return err;
1242 }
1243
1244 EXPORT_SYMBOL(snd_pcm_suspend);
1245
1246 /**
1247 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1248 * @pcm: the PCM instance
1249 *
1250 * After this call, all streams are changed to SUSPENDED state.
1251 *
1252 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1253 */
1254 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1255 {
1256 struct snd_pcm_substream *substream;
1257 int stream, err = 0;
1258
1259 if (! pcm)
1260 return 0;
1261
1262 for (stream = 0; stream < 2; stream++) {
1263 for (substream = pcm->streams[stream].substream;
1264 substream; substream = substream->next) {
1265 /* FIXME: the open/close code should lock this as well */
1266 if (substream->runtime == NULL)
1267 continue;
1268 err = snd_pcm_suspend(substream);
1269 if (err < 0 && err != -EBUSY)
1270 return err;
1271 }
1272 }
1273 return 0;
1274 }
1275
1276 EXPORT_SYMBOL(snd_pcm_suspend_all);
1277
1278 /* resume */
1279
1280 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1281 {
1282 struct snd_pcm_runtime *runtime = substream->runtime;
1283 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1284 return -ENOSYS;
1285 runtime->trigger_master = substream;
1286 return 0;
1287 }
1288
1289 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1290 {
1291 struct snd_pcm_runtime *runtime = substream->runtime;
1292 if (runtime->trigger_master != substream)
1293 return 0;
1294 /* DMA not running previously? */
1295 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1296 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1297 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1298 return 0;
1299 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1300 }
1301
1302 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1303 {
1304 if (substream->runtime->trigger_master == substream &&
1305 snd_pcm_running(substream))
1306 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1307 }
1308
1309 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1310 {
1311 struct snd_pcm_runtime *runtime = substream->runtime;
1312 snd_pcm_trigger_tstamp(substream);
1313 if (substream->timer)
1314 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1315 &runtime->trigger_tstamp);
1316 runtime->status->state = runtime->status->suspended_state;
1317 }
1318
1319 static struct action_ops snd_pcm_action_resume = {
1320 .pre_action = snd_pcm_pre_resume,
1321 .do_action = snd_pcm_do_resume,
1322 .undo_action = snd_pcm_undo_resume,
1323 .post_action = snd_pcm_post_resume
1324 };
1325
1326 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1327 {
1328 struct snd_card *card = substream->pcm->card;
1329 int res;
1330
1331 snd_power_lock(card);
1332 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1333 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1334 snd_power_unlock(card);
1335 return res;
1336 }
1337
1338 #else
1339
1340 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1341 {
1342 return -ENOSYS;
1343 }
1344
1345 #endif /* CONFIG_PM */
1346
1347 /*
1348 * xrun ioctl
1349 *
1350 * Change the RUNNING stream(s) to XRUN state.
1351 */
1352 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1353 {
1354 struct snd_card *card = substream->pcm->card;
1355 struct snd_pcm_runtime *runtime = substream->runtime;
1356 int result;
1357
1358 snd_power_lock(card);
1359 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1360 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1361 if (result < 0)
1362 goto _unlock;
1363 }
1364
1365 snd_pcm_stream_lock_irq(substream);
1366 switch (runtime->status->state) {
1367 case SNDRV_PCM_STATE_XRUN:
1368 result = 0; /* already there */
1369 break;
1370 case SNDRV_PCM_STATE_RUNNING:
1371 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1372 break;
1373 default:
1374 result = -EBADFD;
1375 }
1376 snd_pcm_stream_unlock_irq(substream);
1377 _unlock:
1378 snd_power_unlock(card);
1379 return result;
1380 }
1381
1382 /*
1383 * reset ioctl
1384 */
1385 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1386 {
1387 struct snd_pcm_runtime *runtime = substream->runtime;
1388 switch (runtime->status->state) {
1389 case SNDRV_PCM_STATE_RUNNING:
1390 case SNDRV_PCM_STATE_PREPARED:
1391 case SNDRV_PCM_STATE_PAUSED:
1392 case SNDRV_PCM_STATE_SUSPENDED:
1393 return 0;
1394 default:
1395 return -EBADFD;
1396 }
1397 }
1398
1399 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1400 {
1401 struct snd_pcm_runtime *runtime = substream->runtime;
1402 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1403 if (err < 0)
1404 return err;
1405 runtime->hw_ptr_base = 0;
1406 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1407 runtime->status->hw_ptr % runtime->period_size;
1408 runtime->silence_start = runtime->status->hw_ptr;
1409 runtime->silence_filled = 0;
1410 return 0;
1411 }
1412
1413 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1414 {
1415 struct snd_pcm_runtime *runtime = substream->runtime;
1416 runtime->control->appl_ptr = runtime->status->hw_ptr;
1417 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1418 runtime->silence_size > 0)
1419 snd_pcm_playback_silence(substream, ULONG_MAX);
1420 }
1421
1422 static struct action_ops snd_pcm_action_reset = {
1423 .pre_action = snd_pcm_pre_reset,
1424 .do_action = snd_pcm_do_reset,
1425 .post_action = snd_pcm_post_reset
1426 };
1427
1428 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1429 {
1430 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1431 }
1432
1433 /*
1434 * prepare ioctl
1435 */
1436 /* we use the second argument for updating f_flags */
1437 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1438 int f_flags)
1439 {
1440 struct snd_pcm_runtime *runtime = substream->runtime;
1441 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1442 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1443 return -EBADFD;
1444 if (snd_pcm_running(substream))
1445 return -EBUSY;
1446 substream->f_flags = f_flags;
1447 return 0;
1448 }
1449
1450 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1451 {
1452 int err;
1453 err = substream->ops->prepare(substream);
1454 if (err < 0)
1455 return err;
1456 return snd_pcm_do_reset(substream, 0);
1457 }
1458
1459 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1460 {
1461 struct snd_pcm_runtime *runtime = substream->runtime;
1462 runtime->control->appl_ptr = runtime->status->hw_ptr;
1463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1464 }
1465
1466 static struct action_ops snd_pcm_action_prepare = {
1467 .pre_action = snd_pcm_pre_prepare,
1468 .do_action = snd_pcm_do_prepare,
1469 .post_action = snd_pcm_post_prepare
1470 };
1471
1472 /**
1473 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1474 * @substream: the PCM substream instance
1475 * @file: file to refer f_flags
1476 *
1477 * Return: Zero if successful, or a negative error code.
1478 */
1479 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1480 struct file *file)
1481 {
1482 int res;
1483 struct snd_card *card = substream->pcm->card;
1484 int f_flags;
1485
1486 if (file)
1487 f_flags = file->f_flags;
1488 else
1489 f_flags = substream->f_flags;
1490
1491 snd_power_lock(card);
1492 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1493 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1494 substream, f_flags);
1495 snd_power_unlock(card);
1496 return res;
1497 }
1498
1499 /*
1500 * drain ioctl
1501 */
1502
1503 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1504 {
1505 struct snd_pcm_runtime *runtime = substream->runtime;
1506 switch (runtime->status->state) {
1507 case SNDRV_PCM_STATE_OPEN:
1508 case SNDRV_PCM_STATE_DISCONNECTED:
1509 case SNDRV_PCM_STATE_SUSPENDED:
1510 return -EBADFD;
1511 }
1512 runtime->trigger_master = substream;
1513 return 0;
1514 }
1515
1516 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1517 {
1518 struct snd_pcm_runtime *runtime = substream->runtime;
1519 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1520 switch (runtime->status->state) {
1521 case SNDRV_PCM_STATE_PREPARED:
1522 /* start playback stream if possible */
1523 if (! snd_pcm_playback_empty(substream)) {
1524 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1525 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1526 }
1527 break;
1528 case SNDRV_PCM_STATE_RUNNING:
1529 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1530 break;
1531 case SNDRV_PCM_STATE_XRUN:
1532 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1533 break;
1534 default:
1535 break;
1536 }
1537 } else {
1538 /* stop running stream */
1539 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1540 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1541 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1542 snd_pcm_do_stop(substream, new_state);
1543 snd_pcm_post_stop(substream, new_state);
1544 }
1545 }
1546 return 0;
1547 }
1548
1549 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1550 {
1551 }
1552
1553 static struct action_ops snd_pcm_action_drain_init = {
1554 .pre_action = snd_pcm_pre_drain_init,
1555 .do_action = snd_pcm_do_drain_init,
1556 .post_action = snd_pcm_post_drain_init
1557 };
1558
1559 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1560
1561 /*
1562 * Drain the stream(s).
1563 * When the substream is linked, sync until the draining of all playback streams
1564 * is finished.
1565 * After this call, all streams are supposed to be either SETUP or DRAINING
1566 * (capture only) state.
1567 */
1568 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1569 struct file *file)
1570 {
1571 struct snd_card *card;
1572 struct snd_pcm_runtime *runtime;
1573 struct snd_pcm_substream *s;
1574 wait_queue_t wait;
1575 int result = 0;
1576 int nonblock = 0;
1577
1578 card = substream->pcm->card;
1579 runtime = substream->runtime;
1580
1581 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1582 return -EBADFD;
1583
1584 snd_power_lock(card);
1585 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1586 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1587 if (result < 0) {
1588 snd_power_unlock(card);
1589 return result;
1590 }
1591 }
1592
1593 if (file) {
1594 if (file->f_flags & O_NONBLOCK)
1595 nonblock = 1;
1596 } else if (substream->f_flags & O_NONBLOCK)
1597 nonblock = 1;
1598
1599 down_read(&snd_pcm_link_rwsem);
1600 snd_pcm_stream_lock_irq(substream);
1601 /* resume pause */
1602 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1603 snd_pcm_pause(substream, 0);
1604
1605 /* pre-start/stop - all running streams are changed to DRAINING state */
1606 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1607 if (result < 0)
1608 goto unlock;
1609 /* in non-blocking, we don't wait in ioctl but let caller poll */
1610 if (nonblock) {
1611 result = -EAGAIN;
1612 goto unlock;
1613 }
1614
1615 for (;;) {
1616 long tout;
1617 struct snd_pcm_runtime *to_check;
1618 if (signal_pending(current)) {
1619 result = -ERESTARTSYS;
1620 break;
1621 }
1622 /* find a substream to drain */
1623 to_check = NULL;
1624 snd_pcm_group_for_each_entry(s, substream) {
1625 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1626 continue;
1627 runtime = s->runtime;
1628 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1629 to_check = runtime;
1630 break;
1631 }
1632 }
1633 if (!to_check)
1634 break; /* all drained */
1635 init_waitqueue_entry(&wait, current);
1636 add_wait_queue(&to_check->sleep, &wait);
1637 snd_pcm_stream_unlock_irq(substream);
1638 up_read(&snd_pcm_link_rwsem);
1639 snd_power_unlock(card);
1640 if (runtime->no_period_wakeup)
1641 tout = MAX_SCHEDULE_TIMEOUT;
1642 else {
1643 tout = 10;
1644 if (runtime->rate) {
1645 long t = runtime->period_size * 2 / runtime->rate;
1646 tout = max(t, tout);
1647 }
1648 tout = msecs_to_jiffies(tout * 1000);
1649 }
1650 tout = schedule_timeout_interruptible(tout);
1651 snd_power_lock(card);
1652 down_read(&snd_pcm_link_rwsem);
1653 snd_pcm_stream_lock_irq(substream);
1654 remove_wait_queue(&to_check->sleep, &wait);
1655 if (card->shutdown) {
1656 result = -ENODEV;
1657 break;
1658 }
1659 if (tout == 0) {
1660 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1661 result = -ESTRPIPE;
1662 else {
1663 dev_dbg(substream->pcm->card->dev,
1664 "playback drain error (DMA or IRQ trouble?)\n");
1665 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1666 result = -EIO;
1667 }
1668 break;
1669 }
1670 }
1671
1672 unlock:
1673 snd_pcm_stream_unlock_irq(substream);
1674 up_read(&snd_pcm_link_rwsem);
1675 snd_power_unlock(card);
1676
1677 return result;
1678 }
1679
1680 /*
1681 * drop ioctl
1682 *
1683 * Immediately put all linked substreams into SETUP state.
1684 */
1685 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1686 {
1687 struct snd_pcm_runtime *runtime;
1688 int result = 0;
1689
1690 if (PCM_RUNTIME_CHECK(substream))
1691 return -ENXIO;
1692 runtime = substream->runtime;
1693
1694 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1695 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1696 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1697 return -EBADFD;
1698
1699 snd_pcm_stream_lock_irq(substream);
1700 /* resume pause */
1701 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1702 snd_pcm_pause(substream, 0);
1703
1704 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1705 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1706 snd_pcm_stream_unlock_irq(substream);
1707
1708 return result;
1709 }
1710
1711
1712 static bool is_pcm_file(struct file *file)
1713 {
1714 struct inode *inode = file_inode(file);
1715 unsigned int minor;
1716
1717 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1718 return false;
1719 minor = iminor(inode);
1720 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1721 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1722 }
1723
1724 /*
1725 * PCM link handling
1726 */
1727 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1728 {
1729 int res = 0;
1730 struct snd_pcm_file *pcm_file;
1731 struct snd_pcm_substream *substream1;
1732 struct snd_pcm_group *group;
1733 struct fd f = fdget(fd);
1734
1735 if (!f.file)
1736 return -EBADFD;
1737 if (!is_pcm_file(f.file)) {
1738 res = -EBADFD;
1739 goto _badf;
1740 }
1741 pcm_file = f.file->private_data;
1742 substream1 = pcm_file->substream;
1743 group = kmalloc(sizeof(*group), GFP_KERNEL);
1744 if (!group) {
1745 res = -ENOMEM;
1746 goto _nolock;
1747 }
1748 down_write(&snd_pcm_link_rwsem);
1749 write_lock_irq(&snd_pcm_link_rwlock);
1750 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1751 substream->runtime->status->state != substream1->runtime->status->state ||
1752 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1753 res = -EBADFD;
1754 goto _end;
1755 }
1756 if (snd_pcm_stream_linked(substream1)) {
1757 res = -EALREADY;
1758 goto _end;
1759 }
1760 if (!snd_pcm_stream_linked(substream)) {
1761 substream->group = group;
1762 group = NULL;
1763 spin_lock_init(&substream->group->lock);
1764 mutex_init(&substream->group->mutex);
1765 INIT_LIST_HEAD(&substream->group->substreams);
1766 list_add_tail(&substream->link_list, &substream->group->substreams);
1767 substream->group->count = 1;
1768 }
1769 list_add_tail(&substream1->link_list, &substream->group->substreams);
1770 substream->group->count++;
1771 substream1->group = substream->group;
1772 _end:
1773 write_unlock_irq(&snd_pcm_link_rwlock);
1774 up_write(&snd_pcm_link_rwsem);
1775 _nolock:
1776 snd_card_unref(substream1->pcm->card);
1777 kfree(group);
1778 _badf:
1779 fdput(f);
1780 return res;
1781 }
1782
1783 static void relink_to_local(struct snd_pcm_substream *substream)
1784 {
1785 substream->group = &substream->self_group;
1786 INIT_LIST_HEAD(&substream->self_group.substreams);
1787 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1788 }
1789
1790 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1791 {
1792 struct snd_pcm_substream *s;
1793 int res = 0;
1794
1795 down_write(&snd_pcm_link_rwsem);
1796 write_lock_irq(&snd_pcm_link_rwlock);
1797 if (!snd_pcm_stream_linked(substream)) {
1798 res = -EALREADY;
1799 goto _end;
1800 }
1801 list_del(&substream->link_list);
1802 substream->group->count--;
1803 if (substream->group->count == 1) { /* detach the last stream, too */
1804 snd_pcm_group_for_each_entry(s, substream) {
1805 relink_to_local(s);
1806 break;
1807 }
1808 kfree(substream->group);
1809 }
1810 relink_to_local(substream);
1811 _end:
1812 write_unlock_irq(&snd_pcm_link_rwlock);
1813 up_write(&snd_pcm_link_rwsem);
1814 return res;
1815 }
1816
1817 /*
1818 * hw configurator
1819 */
1820 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1821 struct snd_pcm_hw_rule *rule)
1822 {
1823 struct snd_interval t;
1824 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1825 hw_param_interval_c(params, rule->deps[1]), &t);
1826 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1827 }
1828
1829 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1830 struct snd_pcm_hw_rule *rule)
1831 {
1832 struct snd_interval t;
1833 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1834 hw_param_interval_c(params, rule->deps[1]), &t);
1835 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1836 }
1837
1838 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1839 struct snd_pcm_hw_rule *rule)
1840 {
1841 struct snd_interval t;
1842 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1843 hw_param_interval_c(params, rule->deps[1]),
1844 (unsigned long) rule->private, &t);
1845 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1846 }
1847
1848 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1849 struct snd_pcm_hw_rule *rule)
1850 {
1851 struct snd_interval t;
1852 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1853 (unsigned long) rule->private,
1854 hw_param_interval_c(params, rule->deps[1]), &t);
1855 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1856 }
1857
1858 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1859 struct snd_pcm_hw_rule *rule)
1860 {
1861 unsigned int k;
1862 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1863 struct snd_mask m;
1864 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1865 snd_mask_any(&m);
1866 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1867 int bits;
1868 if (! snd_mask_test(mask, k))
1869 continue;
1870 bits = snd_pcm_format_physical_width(k);
1871 if (bits <= 0)
1872 continue; /* ignore invalid formats */
1873 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1874 snd_mask_reset(&m, k);
1875 }
1876 return snd_mask_refine(mask, &m);
1877 }
1878
1879 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1880 struct snd_pcm_hw_rule *rule)
1881 {
1882 struct snd_interval t;
1883 unsigned int k;
1884 t.min = UINT_MAX;
1885 t.max = 0;
1886 t.openmin = 0;
1887 t.openmax = 0;
1888 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1889 int bits;
1890 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1891 continue;
1892 bits = snd_pcm_format_physical_width(k);
1893 if (bits <= 0)
1894 continue; /* ignore invalid formats */
1895 if (t.min > (unsigned)bits)
1896 t.min = bits;
1897 if (t.max < (unsigned)bits)
1898 t.max = bits;
1899 }
1900 t.integer = 1;
1901 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1902 }
1903
1904 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1905 #error "Change this table"
1906 #endif
1907
1908 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1909 48000, 64000, 88200, 96000, 176400, 192000 };
1910
1911 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1912 .count = ARRAY_SIZE(rates),
1913 .list = rates,
1914 };
1915
1916 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1917 struct snd_pcm_hw_rule *rule)
1918 {
1919 struct snd_pcm_hardware *hw = rule->private;
1920 return snd_interval_list(hw_param_interval(params, rule->var),
1921 snd_pcm_known_rates.count,
1922 snd_pcm_known_rates.list, hw->rates);
1923 }
1924
1925 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1926 struct snd_pcm_hw_rule *rule)
1927 {
1928 struct snd_interval t;
1929 struct snd_pcm_substream *substream = rule->private;
1930 t.min = 0;
1931 t.max = substream->buffer_bytes_max;
1932 t.openmin = 0;
1933 t.openmax = 0;
1934 t.integer = 1;
1935 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1936 }
1937
1938 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1939 {
1940 struct snd_pcm_runtime *runtime = substream->runtime;
1941 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1942 int k, err;
1943
1944 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1945 snd_mask_any(constrs_mask(constrs, k));
1946 }
1947
1948 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1949 snd_interval_any(constrs_interval(constrs, k));
1950 }
1951
1952 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1953 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1954 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1955 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1956 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1957
1958 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1959 snd_pcm_hw_rule_format, NULL,
1960 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1961 if (err < 0)
1962 return err;
1963 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1964 snd_pcm_hw_rule_sample_bits, NULL,
1965 SNDRV_PCM_HW_PARAM_FORMAT,
1966 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1967 if (err < 0)
1968 return err;
1969 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1970 snd_pcm_hw_rule_div, NULL,
1971 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1972 if (err < 0)
1973 return err;
1974 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1975 snd_pcm_hw_rule_mul, NULL,
1976 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1977 if (err < 0)
1978 return err;
1979 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1980 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1981 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1982 if (err < 0)
1983 return err;
1984 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1985 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1986 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1987 if (err < 0)
1988 return err;
1989 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1990 snd_pcm_hw_rule_div, NULL,
1991 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1992 if (err < 0)
1993 return err;
1994 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1995 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1996 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1997 if (err < 0)
1998 return err;
1999 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2000 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2001 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2002 if (err < 0)
2003 return err;
2004 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2005 snd_pcm_hw_rule_div, NULL,
2006 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2007 if (err < 0)
2008 return err;
2009 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2010 snd_pcm_hw_rule_div, NULL,
2011 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2012 if (err < 0)
2013 return err;
2014 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2015 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2016 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2017 if (err < 0)
2018 return err;
2019 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2020 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2021 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2022 if (err < 0)
2023 return err;
2024 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2025 snd_pcm_hw_rule_mul, NULL,
2026 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2027 if (err < 0)
2028 return err;
2029 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2030 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2031 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2032 if (err < 0)
2033 return err;
2034 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2035 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2036 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2037 if (err < 0)
2038 return err;
2039 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2040 snd_pcm_hw_rule_muldivk, (void*) 8,
2041 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2042 if (err < 0)
2043 return err;
2044 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2045 snd_pcm_hw_rule_muldivk, (void*) 8,
2046 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2047 if (err < 0)
2048 return err;
2049 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2050 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2051 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2052 if (err < 0)
2053 return err;
2054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2055 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2056 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2057 if (err < 0)
2058 return err;
2059 return 0;
2060 }
2061
2062 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2063 {
2064 struct snd_pcm_runtime *runtime = substream->runtime;
2065 struct snd_pcm_hardware *hw = &runtime->hw;
2066 int err;
2067 unsigned int mask = 0;
2068
2069 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2070 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2071 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2072 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2073 if (hw->info & SNDRV_PCM_INFO_MMAP) {
2074 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2075 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2076 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2077 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2078 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2079 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2080 }
2081 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2082 if (err < 0)
2083 return err;
2084
2085 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2086 if (err < 0)
2087 return err;
2088
2089 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2090 if (err < 0)
2091 return err;
2092
2093 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2094 hw->channels_min, hw->channels_max);
2095 if (err < 0)
2096 return err;
2097
2098 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2099 hw->rate_min, hw->rate_max);
2100 if (err < 0)
2101 return err;
2102
2103 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2104 hw->period_bytes_min, hw->period_bytes_max);
2105 if (err < 0)
2106 return err;
2107
2108 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2109 hw->periods_min, hw->periods_max);
2110 if (err < 0)
2111 return err;
2112
2113 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2114 hw->period_bytes_min, hw->buffer_bytes_max);
2115 if (err < 0)
2116 return err;
2117
2118 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2119 snd_pcm_hw_rule_buffer_bytes_max, substream,
2120 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2121 if (err < 0)
2122 return err;
2123
2124 /* FIXME: remove */
2125 if (runtime->dma_bytes) {
2126 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2127 if (err < 0)
2128 return err;
2129 }
2130
2131 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2132 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2133 snd_pcm_hw_rule_rate, hw,
2134 SNDRV_PCM_HW_PARAM_RATE, -1);
2135 if (err < 0)
2136 return err;
2137 }
2138
2139 /* FIXME: this belong to lowlevel */
2140 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2141
2142 return 0;
2143 }
2144
2145 static void pcm_release_private(struct snd_pcm_substream *substream)
2146 {
2147 snd_pcm_unlink(substream);
2148 }
2149
2150 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2151 {
2152 substream->ref_count--;
2153 if (substream->ref_count > 0)
2154 return;
2155
2156 snd_pcm_drop(substream);
2157 if (substream->hw_opened) {
2158 if (substream->ops->hw_free != NULL)
2159 substream->ops->hw_free(substream);
2160 substream->ops->close(substream);
2161 substream->hw_opened = 0;
2162 }
2163 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2164 pm_qos_remove_request(&substream->latency_pm_qos_req);
2165 if (substream->pcm_release) {
2166 substream->pcm_release(substream);
2167 substream->pcm_release = NULL;
2168 }
2169 snd_pcm_detach_substream(substream);
2170 }
2171
2172 EXPORT_SYMBOL(snd_pcm_release_substream);
2173
2174 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2175 struct file *file,
2176 struct snd_pcm_substream **rsubstream)
2177 {
2178 struct snd_pcm_substream *substream;
2179 int err;
2180
2181 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2182 if (err < 0)
2183 return err;
2184 if (substream->ref_count > 1) {
2185 *rsubstream = substream;
2186 return 0;
2187 }
2188
2189 err = snd_pcm_hw_constraints_init(substream);
2190 if (err < 0) {
2191 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2192 goto error;
2193 }
2194
2195 if ((err = substream->ops->open(substream)) < 0)
2196 goto error;
2197
2198 substream->hw_opened = 1;
2199
2200 err = snd_pcm_hw_constraints_complete(substream);
2201 if (err < 0) {
2202 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2203 goto error;
2204 }
2205
2206 *rsubstream = substream;
2207 return 0;
2208
2209 error:
2210 snd_pcm_release_substream(substream);
2211 return err;
2212 }
2213
2214 EXPORT_SYMBOL(snd_pcm_open_substream);
2215
2216 static int snd_pcm_open_file(struct file *file,
2217 struct snd_pcm *pcm,
2218 int stream)
2219 {
2220 struct snd_pcm_file *pcm_file;
2221 struct snd_pcm_substream *substream;
2222 int err;
2223
2224 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2225 if (err < 0)
2226 return err;
2227
2228 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2229 if (pcm_file == NULL) {
2230 snd_pcm_release_substream(substream);
2231 return -ENOMEM;
2232 }
2233 pcm_file->substream = substream;
2234 if (substream->ref_count == 1) {
2235 substream->file = pcm_file;
2236 substream->pcm_release = pcm_release_private;
2237 }
2238 file->private_data = pcm_file;
2239
2240 return 0;
2241 }
2242
2243 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2244 {
2245 struct snd_pcm *pcm;
2246 int err = nonseekable_open(inode, file);
2247 if (err < 0)
2248 return err;
2249 pcm = snd_lookup_minor_data(iminor(inode),
2250 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2251 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2252 if (pcm)
2253 snd_card_unref(pcm->card);
2254 return err;
2255 }
2256
2257 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2258 {
2259 struct snd_pcm *pcm;
2260 int err = nonseekable_open(inode, file);
2261 if (err < 0)
2262 return err;
2263 pcm = snd_lookup_minor_data(iminor(inode),
2264 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2265 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2266 if (pcm)
2267 snd_card_unref(pcm->card);
2268 return err;
2269 }
2270
2271 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2272 {
2273 int err;
2274 wait_queue_t wait;
2275
2276 if (pcm == NULL) {
2277 err = -ENODEV;
2278 goto __error1;
2279 }
2280 err = snd_card_file_add(pcm->card, file);
2281 if (err < 0)
2282 goto __error1;
2283 if (!try_module_get(pcm->card->module)) {
2284 err = -EFAULT;
2285 goto __error2;
2286 }
2287 init_waitqueue_entry(&wait, current);
2288 add_wait_queue(&pcm->open_wait, &wait);
2289 mutex_lock(&pcm->open_mutex);
2290 while (1) {
2291 err = snd_pcm_open_file(file, pcm, stream);
2292 if (err >= 0)
2293 break;
2294 if (err == -EAGAIN) {
2295 if (file->f_flags & O_NONBLOCK) {
2296 err = -EBUSY;
2297 break;
2298 }
2299 } else
2300 break;
2301 set_current_state(TASK_INTERRUPTIBLE);
2302 mutex_unlock(&pcm->open_mutex);
2303 schedule();
2304 mutex_lock(&pcm->open_mutex);
2305 if (pcm->card->shutdown) {
2306 err = -ENODEV;
2307 break;
2308 }
2309 if (signal_pending(current)) {
2310 err = -ERESTARTSYS;
2311 break;
2312 }
2313 }
2314 remove_wait_queue(&pcm->open_wait, &wait);
2315 mutex_unlock(&pcm->open_mutex);
2316 if (err < 0)
2317 goto __error;
2318 return err;
2319
2320 __error:
2321 module_put(pcm->card->module);
2322 __error2:
2323 snd_card_file_remove(pcm->card, file);
2324 __error1:
2325 return err;
2326 }
2327
2328 static int snd_pcm_release(struct inode *inode, struct file *file)
2329 {
2330 struct snd_pcm *pcm;
2331 struct snd_pcm_substream *substream;
2332 struct snd_pcm_file *pcm_file;
2333
2334 pcm_file = file->private_data;
2335 substream = pcm_file->substream;
2336 if (snd_BUG_ON(!substream))
2337 return -ENXIO;
2338 pcm = substream->pcm;
2339 mutex_lock(&pcm->open_mutex);
2340 snd_pcm_release_substream(substream);
2341 kfree(pcm_file);
2342 mutex_unlock(&pcm->open_mutex);
2343 wake_up(&pcm->open_wait);
2344 module_put(pcm->card->module);
2345 snd_card_file_remove(pcm->card, file);
2346 return 0;
2347 }
2348
2349 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2350 snd_pcm_uframes_t frames)
2351 {
2352 struct snd_pcm_runtime *runtime = substream->runtime;
2353 snd_pcm_sframes_t appl_ptr;
2354 snd_pcm_sframes_t ret;
2355 snd_pcm_sframes_t hw_avail;
2356
2357 if (frames == 0)
2358 return 0;
2359
2360 snd_pcm_stream_lock_irq(substream);
2361 switch (runtime->status->state) {
2362 case SNDRV_PCM_STATE_PREPARED:
2363 break;
2364 case SNDRV_PCM_STATE_DRAINING:
2365 case SNDRV_PCM_STATE_RUNNING:
2366 if (snd_pcm_update_hw_ptr(substream) >= 0)
2367 break;
2368 /* Fall through */
2369 case SNDRV_PCM_STATE_XRUN:
2370 ret = -EPIPE;
2371 goto __end;
2372 case SNDRV_PCM_STATE_SUSPENDED:
2373 ret = -ESTRPIPE;
2374 goto __end;
2375 default:
2376 ret = -EBADFD;
2377 goto __end;
2378 }
2379
2380 hw_avail = snd_pcm_playback_hw_avail(runtime);
2381 if (hw_avail <= 0) {
2382 ret = 0;
2383 goto __end;
2384 }
2385 if (frames > (snd_pcm_uframes_t)hw_avail)
2386 frames = hw_avail;
2387 appl_ptr = runtime->control->appl_ptr - frames;
2388 if (appl_ptr < 0)
2389 appl_ptr += runtime->boundary;
2390 runtime->control->appl_ptr = appl_ptr;
2391 ret = frames;
2392 __end:
2393 snd_pcm_stream_unlock_irq(substream);
2394 return ret;
2395 }
2396
2397 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2398 snd_pcm_uframes_t frames)
2399 {
2400 struct snd_pcm_runtime *runtime = substream->runtime;
2401 snd_pcm_sframes_t appl_ptr;
2402 snd_pcm_sframes_t ret;
2403 snd_pcm_sframes_t hw_avail;
2404
2405 if (frames == 0)
2406 return 0;
2407
2408 snd_pcm_stream_lock_irq(substream);
2409 switch (runtime->status->state) {
2410 case SNDRV_PCM_STATE_PREPARED:
2411 case SNDRV_PCM_STATE_DRAINING:
2412 break;
2413 case SNDRV_PCM_STATE_RUNNING:
2414 if (snd_pcm_update_hw_ptr(substream) >= 0)
2415 break;
2416 /* Fall through */
2417 case SNDRV_PCM_STATE_XRUN:
2418 ret = -EPIPE;
2419 goto __end;
2420 case SNDRV_PCM_STATE_SUSPENDED:
2421 ret = -ESTRPIPE;
2422 goto __end;
2423 default:
2424 ret = -EBADFD;
2425 goto __end;
2426 }
2427
2428 hw_avail = snd_pcm_capture_hw_avail(runtime);
2429 if (hw_avail <= 0) {
2430 ret = 0;
2431 goto __end;
2432 }
2433 if (frames > (snd_pcm_uframes_t)hw_avail)
2434 frames = hw_avail;
2435 appl_ptr = runtime->control->appl_ptr - frames;
2436 if (appl_ptr < 0)
2437 appl_ptr += runtime->boundary;
2438 runtime->control->appl_ptr = appl_ptr;
2439 ret = frames;
2440 __end:
2441 snd_pcm_stream_unlock_irq(substream);
2442 return ret;
2443 }
2444
2445 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2446 snd_pcm_uframes_t frames)
2447 {
2448 struct snd_pcm_runtime *runtime = substream->runtime;
2449 snd_pcm_sframes_t appl_ptr;
2450 snd_pcm_sframes_t ret;
2451 snd_pcm_sframes_t avail;
2452
2453 if (frames == 0)
2454 return 0;
2455
2456 snd_pcm_stream_lock_irq(substream);
2457 switch (runtime->status->state) {
2458 case SNDRV_PCM_STATE_PREPARED:
2459 case SNDRV_PCM_STATE_PAUSED:
2460 break;
2461 case SNDRV_PCM_STATE_DRAINING:
2462 case SNDRV_PCM_STATE_RUNNING:
2463 if (snd_pcm_update_hw_ptr(substream) >= 0)
2464 break;
2465 /* Fall through */
2466 case SNDRV_PCM_STATE_XRUN:
2467 ret = -EPIPE;
2468 goto __end;
2469 case SNDRV_PCM_STATE_SUSPENDED:
2470 ret = -ESTRPIPE;
2471 goto __end;
2472 default:
2473 ret = -EBADFD;
2474 goto __end;
2475 }
2476
2477 avail = snd_pcm_playback_avail(runtime);
2478 if (avail <= 0) {
2479 ret = 0;
2480 goto __end;
2481 }
2482 if (frames > (snd_pcm_uframes_t)avail)
2483 frames = avail;
2484 appl_ptr = runtime->control->appl_ptr + frames;
2485 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2486 appl_ptr -= runtime->boundary;
2487 runtime->control->appl_ptr = appl_ptr;
2488 ret = frames;
2489 __end:
2490 snd_pcm_stream_unlock_irq(substream);
2491 return ret;
2492 }
2493
2494 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2495 snd_pcm_uframes_t frames)
2496 {
2497 struct snd_pcm_runtime *runtime = substream->runtime;
2498 snd_pcm_sframes_t appl_ptr;
2499 snd_pcm_sframes_t ret;
2500 snd_pcm_sframes_t avail;
2501
2502 if (frames == 0)
2503 return 0;
2504
2505 snd_pcm_stream_lock_irq(substream);
2506 switch (runtime->status->state) {
2507 case SNDRV_PCM_STATE_PREPARED:
2508 case SNDRV_PCM_STATE_DRAINING:
2509 case SNDRV_PCM_STATE_PAUSED:
2510 break;
2511 case SNDRV_PCM_STATE_RUNNING:
2512 if (snd_pcm_update_hw_ptr(substream) >= 0)
2513 break;
2514 /* Fall through */
2515 case SNDRV_PCM_STATE_XRUN:
2516 ret = -EPIPE;
2517 goto __end;
2518 case SNDRV_PCM_STATE_SUSPENDED:
2519 ret = -ESTRPIPE;
2520 goto __end;
2521 default:
2522 ret = -EBADFD;
2523 goto __end;
2524 }
2525
2526 avail = snd_pcm_capture_avail(runtime);
2527 if (avail <= 0) {
2528 ret = 0;
2529 goto __end;
2530 }
2531 if (frames > (snd_pcm_uframes_t)avail)
2532 frames = avail;
2533 appl_ptr = runtime->control->appl_ptr + frames;
2534 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2535 appl_ptr -= runtime->boundary;
2536 runtime->control->appl_ptr = appl_ptr;
2537 ret = frames;
2538 __end:
2539 snd_pcm_stream_unlock_irq(substream);
2540 return ret;
2541 }
2542
2543 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2544 {
2545 struct snd_pcm_runtime *runtime = substream->runtime;
2546 int err;
2547
2548 snd_pcm_stream_lock_irq(substream);
2549 switch (runtime->status->state) {
2550 case SNDRV_PCM_STATE_DRAINING:
2551 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2552 goto __badfd;
2553 /* Fall through */
2554 case SNDRV_PCM_STATE_RUNNING:
2555 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2556 break;
2557 /* Fall through */
2558 case SNDRV_PCM_STATE_PREPARED:
2559 case SNDRV_PCM_STATE_SUSPENDED:
2560 err = 0;
2561 break;
2562 case SNDRV_PCM_STATE_XRUN:
2563 err = -EPIPE;
2564 break;
2565 default:
2566 __badfd:
2567 err = -EBADFD;
2568 break;
2569 }
2570 snd_pcm_stream_unlock_irq(substream);
2571 return err;
2572 }
2573
2574 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2575 snd_pcm_sframes_t __user *res)
2576 {
2577 struct snd_pcm_runtime *runtime = substream->runtime;
2578 int err;
2579 snd_pcm_sframes_t n = 0;
2580
2581 snd_pcm_stream_lock_irq(substream);
2582 switch (runtime->status->state) {
2583 case SNDRV_PCM_STATE_DRAINING:
2584 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2585 goto __badfd;
2586 /* Fall through */
2587 case SNDRV_PCM_STATE_RUNNING:
2588 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2589 break;
2590 /* Fall through */
2591 case SNDRV_PCM_STATE_PREPARED:
2592 case SNDRV_PCM_STATE_SUSPENDED:
2593 err = 0;
2594 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2595 n = snd_pcm_playback_hw_avail(runtime);
2596 else
2597 n = snd_pcm_capture_avail(runtime);
2598 n += runtime->delay;
2599 break;
2600 case SNDRV_PCM_STATE_XRUN:
2601 err = -EPIPE;
2602 break;
2603 default:
2604 __badfd:
2605 err = -EBADFD;
2606 break;
2607 }
2608 snd_pcm_stream_unlock_irq(substream);
2609 if (!err)
2610 if (put_user(n, res))
2611 err = -EFAULT;
2612 return err;
2613 }
2614
2615 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2616 struct snd_pcm_sync_ptr __user *_sync_ptr)
2617 {
2618 struct snd_pcm_runtime *runtime = substream->runtime;
2619 struct snd_pcm_sync_ptr sync_ptr;
2620 volatile struct snd_pcm_mmap_status *status;
2621 volatile struct snd_pcm_mmap_control *control;
2622 int err;
2623
2624 memset(&sync_ptr, 0, sizeof(sync_ptr));
2625 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2626 return -EFAULT;
2627 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2628 return -EFAULT;
2629 status = runtime->status;
2630 control = runtime->control;
2631 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2632 err = snd_pcm_hwsync(substream);
2633 if (err < 0)
2634 return err;
2635 }
2636 snd_pcm_stream_lock_irq(substream);
2637 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2638 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2639 else
2640 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2641 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2642 control->avail_min = sync_ptr.c.control.avail_min;
2643 else
2644 sync_ptr.c.control.avail_min = control->avail_min;
2645 sync_ptr.s.status.state = status->state;
2646 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2647 sync_ptr.s.status.tstamp = status->tstamp;
2648 sync_ptr.s.status.suspended_state = status->suspended_state;
2649 snd_pcm_stream_unlock_irq(substream);
2650 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2651 return -EFAULT;
2652 return 0;
2653 }
2654
2655 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2656 {
2657 struct snd_pcm_runtime *runtime = substream->runtime;
2658 int arg;
2659
2660 if (get_user(arg, _arg))
2661 return -EFAULT;
2662 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2663 return -EINVAL;
2664 runtime->tstamp_type = arg;
2665 return 0;
2666 }
2667
2668 static int snd_pcm_common_ioctl1(struct file *file,
2669 struct snd_pcm_substream *substream,
2670 unsigned int cmd, void __user *arg)
2671 {
2672 switch (cmd) {
2673 case SNDRV_PCM_IOCTL_PVERSION:
2674 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2675 case SNDRV_PCM_IOCTL_INFO:
2676 return snd_pcm_info_user(substream, arg);
2677 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2678 return 0;
2679 case SNDRV_PCM_IOCTL_TTSTAMP:
2680 return snd_pcm_tstamp(substream, arg);
2681 case SNDRV_PCM_IOCTL_HW_REFINE:
2682 return snd_pcm_hw_refine_user(substream, arg);
2683 case SNDRV_PCM_IOCTL_HW_PARAMS:
2684 return snd_pcm_hw_params_user(substream, arg);
2685 case SNDRV_PCM_IOCTL_HW_FREE:
2686 return snd_pcm_hw_free(substream);
2687 case SNDRV_PCM_IOCTL_SW_PARAMS:
2688 return snd_pcm_sw_params_user(substream, arg);
2689 case SNDRV_PCM_IOCTL_STATUS:
2690 return snd_pcm_status_user(substream, arg);
2691 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2692 return snd_pcm_channel_info_user(substream, arg);
2693 case SNDRV_PCM_IOCTL_PREPARE:
2694 return snd_pcm_prepare(substream, file);
2695 case SNDRV_PCM_IOCTL_RESET:
2696 return snd_pcm_reset(substream);
2697 case SNDRV_PCM_IOCTL_START:
2698 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2699 case SNDRV_PCM_IOCTL_LINK:
2700 return snd_pcm_link(substream, (int)(unsigned long) arg);
2701 case SNDRV_PCM_IOCTL_UNLINK:
2702 return snd_pcm_unlink(substream);
2703 case SNDRV_PCM_IOCTL_RESUME:
2704 return snd_pcm_resume(substream);
2705 case SNDRV_PCM_IOCTL_XRUN:
2706 return snd_pcm_xrun(substream);
2707 case SNDRV_PCM_IOCTL_HWSYNC:
2708 return snd_pcm_hwsync(substream);
2709 case SNDRV_PCM_IOCTL_DELAY:
2710 return snd_pcm_delay(substream, arg);
2711 case SNDRV_PCM_IOCTL_SYNC_PTR:
2712 return snd_pcm_sync_ptr(substream, arg);
2713 #ifdef CONFIG_SND_SUPPORT_OLD_API
2714 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2715 return snd_pcm_hw_refine_old_user(substream, arg);
2716 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2717 return snd_pcm_hw_params_old_user(substream, arg);
2718 #endif
2719 case SNDRV_PCM_IOCTL_DRAIN:
2720 return snd_pcm_drain(substream, file);
2721 case SNDRV_PCM_IOCTL_DROP:
2722 return snd_pcm_drop(substream);
2723 case SNDRV_PCM_IOCTL_PAUSE:
2724 {
2725 int res;
2726 snd_pcm_stream_lock_irq(substream);
2727 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2728 snd_pcm_stream_unlock_irq(substream);
2729 return res;
2730 }
2731 }
2732 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2733 return -ENOTTY;
2734 }
2735
2736 static int snd_pcm_playback_ioctl1(struct file *file,
2737 struct snd_pcm_substream *substream,
2738 unsigned int cmd, void __user *arg)
2739 {
2740 if (snd_BUG_ON(!substream))
2741 return -ENXIO;
2742 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2743 return -EINVAL;
2744 switch (cmd) {
2745 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2746 {
2747 struct snd_xferi xferi;
2748 struct snd_xferi __user *_xferi = arg;
2749 struct snd_pcm_runtime *runtime = substream->runtime;
2750 snd_pcm_sframes_t result;
2751 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2752 return -EBADFD;
2753 if (put_user(0, &_xferi->result))
2754 return -EFAULT;
2755 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2756 return -EFAULT;
2757 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2758 __put_user(result, &_xferi->result);
2759 return result < 0 ? result : 0;
2760 }
2761 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2762 {
2763 struct snd_xfern xfern;
2764 struct snd_xfern __user *_xfern = arg;
2765 struct snd_pcm_runtime *runtime = substream->runtime;
2766 void __user **bufs;
2767 snd_pcm_sframes_t result;
2768 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2769 return -EBADFD;
2770 if (runtime->channels > 128)
2771 return -EINVAL;
2772 if (put_user(0, &_xfern->result))
2773 return -EFAULT;
2774 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2775 return -EFAULT;
2776
2777 bufs = memdup_user(xfern.bufs,
2778 sizeof(void *) * runtime->channels);
2779 if (IS_ERR(bufs))
2780 return PTR_ERR(bufs);
2781 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2782 kfree(bufs);
2783 __put_user(result, &_xfern->result);
2784 return result < 0 ? result : 0;
2785 }
2786 case SNDRV_PCM_IOCTL_REWIND:
2787 {
2788 snd_pcm_uframes_t frames;
2789 snd_pcm_uframes_t __user *_frames = arg;
2790 snd_pcm_sframes_t result;
2791 if (get_user(frames, _frames))
2792 return -EFAULT;
2793 if (put_user(0, _frames))
2794 return -EFAULT;
2795 result = snd_pcm_playback_rewind(substream, frames);
2796 __put_user(result, _frames);
2797 return result < 0 ? result : 0;
2798 }
2799 case SNDRV_PCM_IOCTL_FORWARD:
2800 {
2801 snd_pcm_uframes_t frames;
2802 snd_pcm_uframes_t __user *_frames = arg;
2803 snd_pcm_sframes_t result;
2804 if (get_user(frames, _frames))
2805 return -EFAULT;
2806 if (put_user(0, _frames))
2807 return -EFAULT;
2808 result = snd_pcm_playback_forward(substream, frames);
2809 __put_user(result, _frames);
2810 return result < 0 ? result : 0;
2811 }
2812 }
2813 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2814 }
2815
2816 static int snd_pcm_capture_ioctl1(struct file *file,
2817 struct snd_pcm_substream *substream,
2818 unsigned int cmd, void __user *arg)
2819 {
2820 if (snd_BUG_ON(!substream))
2821 return -ENXIO;
2822 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2823 return -EINVAL;
2824 switch (cmd) {
2825 case SNDRV_PCM_IOCTL_READI_FRAMES:
2826 {
2827 struct snd_xferi xferi;
2828 struct snd_xferi __user *_xferi = arg;
2829 struct snd_pcm_runtime *runtime = substream->runtime;
2830 snd_pcm_sframes_t result;
2831 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2832 return -EBADFD;
2833 if (put_user(0, &_xferi->result))
2834 return -EFAULT;
2835 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2836 return -EFAULT;
2837 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2838 __put_user(result, &_xferi->result);
2839 return result < 0 ? result : 0;
2840 }
2841 case SNDRV_PCM_IOCTL_READN_FRAMES:
2842 {
2843 struct snd_xfern xfern;
2844 struct snd_xfern __user *_xfern = arg;
2845 struct snd_pcm_runtime *runtime = substream->runtime;
2846 void *bufs;
2847 snd_pcm_sframes_t result;
2848 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2849 return -EBADFD;
2850 if (runtime->channels > 128)
2851 return -EINVAL;
2852 if (put_user(0, &_xfern->result))
2853 return -EFAULT;
2854 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2855 return -EFAULT;
2856
2857 bufs = memdup_user(xfern.bufs,
2858 sizeof(void *) * runtime->channels);
2859 if (IS_ERR(bufs))
2860 return PTR_ERR(bufs);
2861 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2862 kfree(bufs);
2863 __put_user(result, &_xfern->result);
2864 return result < 0 ? result : 0;
2865 }
2866 case SNDRV_PCM_IOCTL_REWIND:
2867 {
2868 snd_pcm_uframes_t frames;
2869 snd_pcm_uframes_t __user *_frames = arg;
2870 snd_pcm_sframes_t result;
2871 if (get_user(frames, _frames))
2872 return -EFAULT;
2873 if (put_user(0, _frames))
2874 return -EFAULT;
2875 result = snd_pcm_capture_rewind(substream, frames);
2876 __put_user(result, _frames);
2877 return result < 0 ? result : 0;
2878 }
2879 case SNDRV_PCM_IOCTL_FORWARD:
2880 {
2881 snd_pcm_uframes_t frames;
2882 snd_pcm_uframes_t __user *_frames = arg;
2883 snd_pcm_sframes_t result;
2884 if (get_user(frames, _frames))
2885 return -EFAULT;
2886 if (put_user(0, _frames))
2887 return -EFAULT;
2888 result = snd_pcm_capture_forward(substream, frames);
2889 __put_user(result, _frames);
2890 return result < 0 ? result : 0;
2891 }
2892 }
2893 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2894 }
2895
2896 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2897 unsigned long arg)
2898 {
2899 struct snd_pcm_file *pcm_file;
2900
2901 pcm_file = file->private_data;
2902
2903 if (((cmd >> 8) & 0xff) != 'A')
2904 return -ENOTTY;
2905
2906 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2907 (void __user *)arg);
2908 }
2909
2910 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2911 unsigned long arg)
2912 {
2913 struct snd_pcm_file *pcm_file;
2914
2915 pcm_file = file->private_data;
2916
2917 if (((cmd >> 8) & 0xff) != 'A')
2918 return -ENOTTY;
2919
2920 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2921 (void __user *)arg);
2922 }
2923
2924 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2925 unsigned int cmd, void *arg)
2926 {
2927 mm_segment_t fs;
2928 int result;
2929
2930 fs = snd_enter_user();
2931 switch (substream->stream) {
2932 case SNDRV_PCM_STREAM_PLAYBACK:
2933 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2934 (void __user *)arg);
2935 break;
2936 case SNDRV_PCM_STREAM_CAPTURE:
2937 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2938 (void __user *)arg);
2939 break;
2940 default:
2941 result = -EINVAL;
2942 break;
2943 }
2944 snd_leave_user(fs);
2945 return result;
2946 }
2947
2948 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2949
2950 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2951 loff_t * offset)
2952 {
2953 struct snd_pcm_file *pcm_file;
2954 struct snd_pcm_substream *substream;
2955 struct snd_pcm_runtime *runtime;
2956 snd_pcm_sframes_t result;
2957
2958 pcm_file = file->private_data;
2959 substream = pcm_file->substream;
2960 if (PCM_RUNTIME_CHECK(substream))
2961 return -ENXIO;
2962 runtime = substream->runtime;
2963 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2964 return -EBADFD;
2965 if (!frame_aligned(runtime, count))
2966 return -EINVAL;
2967 count = bytes_to_frames(runtime, count);
2968 result = snd_pcm_lib_read(substream, buf, count);
2969 if (result > 0)
2970 result = frames_to_bytes(runtime, result);
2971 return result;
2972 }
2973
2974 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2975 size_t count, loff_t * offset)
2976 {
2977 struct snd_pcm_file *pcm_file;
2978 struct snd_pcm_substream *substream;
2979 struct snd_pcm_runtime *runtime;
2980 snd_pcm_sframes_t result;
2981
2982 pcm_file = file->private_data;
2983 substream = pcm_file->substream;
2984 if (PCM_RUNTIME_CHECK(substream))
2985 return -ENXIO;
2986 runtime = substream->runtime;
2987 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2988 return -EBADFD;
2989 if (!frame_aligned(runtime, count))
2990 return -EINVAL;
2991 count = bytes_to_frames(runtime, count);
2992 result = snd_pcm_lib_write(substream, buf, count);
2993 if (result > 0)
2994 result = frames_to_bytes(runtime, result);
2995 return result;
2996 }
2997
2998 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2999 unsigned long nr_segs, loff_t pos)
3000
3001 {
3002 struct snd_pcm_file *pcm_file;
3003 struct snd_pcm_substream *substream;
3004 struct snd_pcm_runtime *runtime;
3005 snd_pcm_sframes_t result;
3006 unsigned long i;
3007 void __user **bufs;
3008 snd_pcm_uframes_t frames;
3009
3010 pcm_file = iocb->ki_filp->private_data;
3011 substream = pcm_file->substream;
3012 if (PCM_RUNTIME_CHECK(substream))
3013 return -ENXIO;
3014 runtime = substream->runtime;
3015 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3016 return -EBADFD;
3017 if (nr_segs > 1024 || nr_segs != runtime->channels)
3018 return -EINVAL;
3019 if (!frame_aligned(runtime, iov->iov_len))
3020 return -EINVAL;
3021 frames = bytes_to_samples(runtime, iov->iov_len);
3022 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
3023 if (bufs == NULL)
3024 return -ENOMEM;
3025 for (i = 0; i < nr_segs; ++i)
3026 bufs[i] = iov[i].iov_base;
3027 result = snd_pcm_lib_readv(substream, bufs, frames);
3028 if (result > 0)
3029 result = frames_to_bytes(runtime, result);
3030 kfree(bufs);
3031 return result;
3032 }
3033
3034 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
3035 unsigned long nr_segs, loff_t pos)
3036 {
3037 struct snd_pcm_file *pcm_file;
3038 struct snd_pcm_substream *substream;
3039 struct snd_pcm_runtime *runtime;
3040 snd_pcm_sframes_t result;
3041 unsigned long i;
3042 void __user **bufs;
3043 snd_pcm_uframes_t frames;
3044
3045 pcm_file = iocb->ki_filp->private_data;
3046 substream = pcm_file->substream;
3047 if (PCM_RUNTIME_CHECK(substream))
3048 return -ENXIO;
3049 runtime = substream->runtime;
3050 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3051 return -EBADFD;
3052 if (nr_segs > 128 || nr_segs != runtime->channels ||
3053 !frame_aligned(runtime, iov->iov_len))
3054 return -EINVAL;
3055 frames = bytes_to_samples(runtime, iov->iov_len);
3056 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
3057 if (bufs == NULL)
3058 return -ENOMEM;
3059 for (i = 0; i < nr_segs; ++i)
3060 bufs[i] = iov[i].iov_base;
3061 result = snd_pcm_lib_writev(substream, bufs, frames);
3062 if (result > 0)
3063 result = frames_to_bytes(runtime, result);
3064 kfree(bufs);
3065 return result;
3066 }
3067
3068 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3069 {
3070 struct snd_pcm_file *pcm_file;
3071 struct snd_pcm_substream *substream;
3072 struct snd_pcm_runtime *runtime;
3073 unsigned int mask;
3074 snd_pcm_uframes_t avail;
3075
3076 pcm_file = file->private_data;
3077
3078 substream = pcm_file->substream;
3079 if (PCM_RUNTIME_CHECK(substream))
3080 return -ENXIO;
3081 runtime = substream->runtime;
3082
3083 poll_wait(file, &runtime->sleep, wait);
3084
3085 snd_pcm_stream_lock_irq(substream);
3086 avail = snd_pcm_playback_avail(runtime);
3087 switch (runtime->status->state) {
3088 case SNDRV_PCM_STATE_RUNNING:
3089 case SNDRV_PCM_STATE_PREPARED:
3090 case SNDRV_PCM_STATE_PAUSED:
3091 if (avail >= runtime->control->avail_min) {
3092 mask = POLLOUT | POLLWRNORM;
3093 break;
3094 }
3095 /* Fall through */
3096 case SNDRV_PCM_STATE_DRAINING:
3097 mask = 0;
3098 break;
3099 default:
3100 mask = POLLOUT | POLLWRNORM | POLLERR;
3101 break;
3102 }
3103 snd_pcm_stream_unlock_irq(substream);
3104 return mask;
3105 }
3106
3107 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3108 {
3109 struct snd_pcm_file *pcm_file;
3110 struct snd_pcm_substream *substream;
3111 struct snd_pcm_runtime *runtime;
3112 unsigned int mask;
3113 snd_pcm_uframes_t avail;
3114
3115 pcm_file = file->private_data;
3116
3117 substream = pcm_file->substream;
3118 if (PCM_RUNTIME_CHECK(substream))
3119 return -ENXIO;
3120 runtime = substream->runtime;
3121
3122 poll_wait(file, &runtime->sleep, wait);
3123
3124 snd_pcm_stream_lock_irq(substream);
3125 avail = snd_pcm_capture_avail(runtime);
3126 switch (runtime->status->state) {
3127 case SNDRV_PCM_STATE_RUNNING:
3128 case SNDRV_PCM_STATE_PREPARED:
3129 case SNDRV_PCM_STATE_PAUSED:
3130 if (avail >= runtime->control->avail_min) {
3131 mask = POLLIN | POLLRDNORM;
3132 break;
3133 }
3134 mask = 0;
3135 break;
3136 case SNDRV_PCM_STATE_DRAINING:
3137 if (avail > 0) {
3138 mask = POLLIN | POLLRDNORM;
3139 break;
3140 }
3141 /* Fall through */
3142 default:
3143 mask = POLLIN | POLLRDNORM | POLLERR;
3144 break;
3145 }
3146 snd_pcm_stream_unlock_irq(substream);
3147 return mask;
3148 }
3149
3150 /*
3151 * mmap support
3152 */
3153
3154 /*
3155 * Only on coherent architectures, we can mmap the status and the control records
3156 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3157 */
3158 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3159 /*
3160 * mmap status record
3161 */
3162 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3163 struct vm_fault *vmf)
3164 {
3165 struct snd_pcm_substream *substream = area->vm_private_data;
3166 struct snd_pcm_runtime *runtime;
3167
3168 if (substream == NULL)
3169 return VM_FAULT_SIGBUS;
3170 runtime = substream->runtime;
3171 vmf->page = virt_to_page(runtime->status);
3172 get_page(vmf->page);
3173 return 0;
3174 }
3175
3176 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3177 {
3178 .fault = snd_pcm_mmap_status_fault,
3179 };
3180
3181 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3182 struct vm_area_struct *area)
3183 {
3184 long size;
3185 if (!(area->vm_flags & VM_READ))
3186 return -EINVAL;
3187 size = area->vm_end - area->vm_start;
3188 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3189 return -EINVAL;
3190 area->vm_ops = &snd_pcm_vm_ops_status;
3191 area->vm_private_data = substream;
3192 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3193 return 0;
3194 }
3195
3196 /*
3197 * mmap control record
3198 */
3199 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3200 struct vm_fault *vmf)
3201 {
3202 struct snd_pcm_substream *substream = area->vm_private_data;
3203 struct snd_pcm_runtime *runtime;
3204
3205 if (substream == NULL)
3206 return VM_FAULT_SIGBUS;
3207 runtime = substream->runtime;
3208 vmf->page = virt_to_page(runtime->control);
3209 get_page(vmf->page);
3210 return 0;
3211 }
3212
3213 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3214 {
3215 .fault = snd_pcm_mmap_control_fault,
3216 };
3217
3218 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3219 struct vm_area_struct *area)
3220 {
3221 long size;
3222 if (!(area->vm_flags & VM_READ))
3223 return -EINVAL;
3224 size = area->vm_end - area->vm_start;
3225 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3226 return -EINVAL;
3227 area->vm_ops = &snd_pcm_vm_ops_control;
3228 area->vm_private_data = substream;
3229 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3230 return 0;
3231 }
3232 #else /* ! coherent mmap */
3233 /*
3234 * don't support mmap for status and control records.
3235 */
3236 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3237 struct vm_area_struct *area)
3238 {
3239 return -ENXIO;
3240 }
3241 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3242 struct vm_area_struct *area)
3243 {
3244 return -ENXIO;
3245 }
3246 #endif /* coherent mmap */
3247
3248 static inline struct page *
3249 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3250 {
3251 void *vaddr = substream->runtime->dma_area + ofs;
3252 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3253 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3254 return virt_to_page(CAC_ADDR(vaddr));
3255 #endif
3256 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3257 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3258 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3259 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3260 /* assume dma_handle set via pfn_to_phys() in
3261 * mm/dma-noncoherent.c
3262 */
3263 return pfn_to_page(addr >> PAGE_SHIFT);
3264 }
3265 #endif
3266 return virt_to_page(vaddr);
3267 }
3268
3269 /*
3270 * fault callback for mmapping a RAM page
3271 */
3272 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3273 struct vm_fault *vmf)
3274 {
3275 struct snd_pcm_substream *substream = area->vm_private_data;
3276 struct snd_pcm_runtime *runtime;
3277 unsigned long offset;
3278 struct page * page;
3279 size_t dma_bytes;
3280
3281 if (substream == NULL)
3282 return VM_FAULT_SIGBUS;
3283 runtime = substream->runtime;
3284 offset = vmf->pgoff << PAGE_SHIFT;
3285 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3286 if (offset > dma_bytes - PAGE_SIZE)
3287 return VM_FAULT_SIGBUS;
3288 if (substream->ops->page)
3289 page = substream->ops->page(substream, offset);
3290 else
3291 page = snd_pcm_default_page_ops(substream, offset);
3292 if (!page)
3293 return VM_FAULT_SIGBUS;
3294 get_page(page);
3295 vmf->page = page;
3296 return 0;
3297 }
3298
3299 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3300 .open = snd_pcm_mmap_data_open,
3301 .close = snd_pcm_mmap_data_close,
3302 };
3303
3304 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3305 .open = snd_pcm_mmap_data_open,
3306 .close = snd_pcm_mmap_data_close,
3307 .fault = snd_pcm_mmap_data_fault,
3308 };
3309
3310 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3311 /* This should be defined / handled globally! */
3312 #if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
3313 #define ARCH_HAS_DMA_MMAP_COHERENT
3314 #endif
3315 #endif
3316
3317 /*
3318 * mmap the DMA buffer on RAM
3319 */
3320 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3321 struct vm_area_struct *area)
3322 {
3323 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3324 #ifdef CONFIG_GENERIC_ALLOCATOR
3325 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3326 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3327 return remap_pfn_range(area, area->vm_start,
3328 substream->dma_buffer.addr >> PAGE_SHIFT,
3329 area->vm_end - area->vm_start, area->vm_page_prot);
3330 }
3331 #endif /* CONFIG_GENERIC_ALLOCATOR */
3332 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3333 if (!substream->ops->page &&
3334 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3335 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3336 area,
3337 substream->runtime->dma_area,
3338 substream->runtime->dma_addr,
3339 area->vm_end - area->vm_start);
3340 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3341 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3342 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3343 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3344 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3345 /* mmap with fault handler */
3346 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3347 return 0;
3348 }
3349 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3350
3351 /*
3352 * mmap the DMA buffer on I/O memory area
3353 */
3354 #if SNDRV_PCM_INFO_MMAP_IOMEM
3355 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3356 struct vm_area_struct *area)
3357 {
3358 struct snd_pcm_runtime *runtime = substream->runtime;;
3359
3360 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3361 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3362 }
3363
3364 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3365 #endif /* SNDRV_PCM_INFO_MMAP */
3366
3367 /*
3368 * mmap DMA buffer
3369 */
3370 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3371 struct vm_area_struct *area)
3372 {
3373 struct snd_pcm_runtime *runtime;
3374 long size;
3375 unsigned long offset;
3376 size_t dma_bytes;
3377 int err;
3378
3379 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3380 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3381 return -EINVAL;
3382 } else {
3383 if (!(area->vm_flags & VM_READ))
3384 return -EINVAL;
3385 }
3386 runtime = substream->runtime;
3387 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3388 return -EBADFD;
3389 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3390 return -ENXIO;
3391 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3392 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3393 return -EINVAL;
3394 size = area->vm_end - area->vm_start;
3395 offset = area->vm_pgoff << PAGE_SHIFT;
3396 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3397 if ((size_t)size > dma_bytes)
3398 return -EINVAL;
3399 if (offset > dma_bytes - size)
3400 return -EINVAL;
3401
3402 area->vm_ops = &snd_pcm_vm_ops_data;
3403 area->vm_private_data = substream;
3404 if (substream->ops->mmap)
3405 err = substream->ops->mmap(substream, area);
3406 else
3407 err = snd_pcm_lib_default_mmap(substream, area);
3408 if (!err)
3409 atomic_inc(&substream->mmap_count);
3410 return err;
3411 }
3412
3413 EXPORT_SYMBOL(snd_pcm_mmap_data);
3414
3415 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3416 {
3417 struct snd_pcm_file * pcm_file;
3418 struct snd_pcm_substream *substream;
3419 unsigned long offset;
3420
3421 pcm_file = file->private_data;
3422 substream = pcm_file->substream;
3423 if (PCM_RUNTIME_CHECK(substream))
3424 return -ENXIO;
3425
3426 offset = area->vm_pgoff << PAGE_SHIFT;
3427 switch (offset) {
3428 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3429 if (pcm_file->no_compat_mmap)
3430 return -ENXIO;
3431 return snd_pcm_mmap_status(substream, file, area);
3432 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3433 if (pcm_file->no_compat_mmap)
3434 return -ENXIO;
3435 return snd_pcm_mmap_control(substream, file, area);
3436 default:
3437 return snd_pcm_mmap_data(substream, file, area);
3438 }
3439 return 0;
3440 }
3441
3442 static int snd_pcm_fasync(int fd, struct file * file, int on)
3443 {
3444 struct snd_pcm_file * pcm_file;
3445 struct snd_pcm_substream *substream;
3446 struct snd_pcm_runtime *runtime;
3447
3448 pcm_file = file->private_data;
3449 substream = pcm_file->substream;
3450 if (PCM_RUNTIME_CHECK(substream))
3451 return -ENXIO;
3452 runtime = substream->runtime;
3453 return fasync_helper(fd, file, on, &runtime->fasync);
3454 }
3455
3456 /*
3457 * ioctl32 compat
3458 */
3459 #ifdef CONFIG_COMPAT
3460 #include "pcm_compat.c"
3461 #else
3462 #define snd_pcm_ioctl_compat NULL
3463 #endif
3464
3465 /*
3466 * To be removed helpers to keep binary compatibility
3467 */
3468
3469 #ifdef CONFIG_SND_SUPPORT_OLD_API
3470 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3471 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3472
3473 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3474 struct snd_pcm_hw_params_old *oparams)
3475 {
3476 unsigned int i;
3477
3478 memset(params, 0, sizeof(*params));
3479 params->flags = oparams->flags;
3480 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3481 params->masks[i].bits[0] = oparams->masks[i];
3482 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3483 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3484 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3485 params->info = oparams->info;
3486 params->msbits = oparams->msbits;
3487 params->rate_num = oparams->rate_num;
3488 params->rate_den = oparams->rate_den;
3489 params->fifo_size = oparams->fifo_size;
3490 }
3491
3492 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3493 struct snd_pcm_hw_params *params)
3494 {
3495 unsigned int i;
3496
3497 memset(oparams, 0, sizeof(*oparams));
3498 oparams->flags = params->flags;
3499 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3500 oparams->masks[i] = params->masks[i].bits[0];
3501 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3502 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3503 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3504 oparams->info = params->info;
3505 oparams->msbits = params->msbits;
3506 oparams->rate_num = params->rate_num;
3507 oparams->rate_den = params->rate_den;
3508 oparams->fifo_size = params->fifo_size;
3509 }
3510
3511 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3512 struct snd_pcm_hw_params_old __user * _oparams)
3513 {
3514 struct snd_pcm_hw_params *params;
3515 struct snd_pcm_hw_params_old *oparams = NULL;
3516 int err;
3517
3518 params = kmalloc(sizeof(*params), GFP_KERNEL);
3519 if (!params)
3520 return -ENOMEM;
3521
3522 oparams = memdup_user(_oparams, sizeof(*oparams));
3523 if (IS_ERR(oparams)) {
3524 err = PTR_ERR(oparams);
3525 goto out;
3526 }
3527 snd_pcm_hw_convert_from_old_params(params, oparams);
3528 err = snd_pcm_hw_refine(substream, params);
3529 snd_pcm_hw_convert_to_old_params(oparams, params);
3530 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3531 if (!err)
3532 err = -EFAULT;
3533 }
3534
3535 kfree(oparams);
3536 out:
3537 kfree(params);
3538 return err;
3539 }
3540
3541 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3542 struct snd_pcm_hw_params_old __user * _oparams)
3543 {
3544 struct snd_pcm_hw_params *params;
3545 struct snd_pcm_hw_params_old *oparams = NULL;
3546 int err;
3547
3548 params = kmalloc(sizeof(*params), GFP_KERNEL);
3549 if (!params)
3550 return -ENOMEM;
3551
3552 oparams = memdup_user(_oparams, sizeof(*oparams));
3553 if (IS_ERR(oparams)) {
3554 err = PTR_ERR(oparams);
3555 goto out;
3556 }
3557 snd_pcm_hw_convert_from_old_params(params, oparams);
3558 err = snd_pcm_hw_params(substream, params);
3559 snd_pcm_hw_convert_to_old_params(oparams, params);
3560 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3561 if (!err)
3562 err = -EFAULT;
3563 }
3564
3565 kfree(oparams);
3566 out:
3567 kfree(params);
3568 return err;
3569 }
3570 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3571
3572 #ifndef CONFIG_MMU
3573 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3574 unsigned long addr,
3575 unsigned long len,
3576 unsigned long pgoff,
3577 unsigned long flags)
3578 {
3579 struct snd_pcm_file *pcm_file = file->private_data;
3580 struct snd_pcm_substream *substream = pcm_file->substream;
3581 struct snd_pcm_runtime *runtime = substream->runtime;
3582 unsigned long offset = pgoff << PAGE_SHIFT;
3583
3584 switch (offset) {
3585 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3586 return (unsigned long)runtime->status;
3587 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3588 return (unsigned long)runtime->control;
3589 default:
3590 return (unsigned long)runtime->dma_area + offset;
3591 }
3592 }
3593 #else
3594 # define snd_pcm_get_unmapped_area NULL
3595 #endif
3596
3597 /*
3598 * Register section
3599 */
3600
3601 const struct file_operations snd_pcm_f_ops[2] = {
3602 {
3603 .owner = THIS_MODULE,
3604 .write = snd_pcm_write,
3605 .aio_write = snd_pcm_aio_write,
3606 .open = snd_pcm_playback_open,
3607 .release = snd_pcm_release,
3608 .llseek = no_llseek,
3609 .poll = snd_pcm_playback_poll,
3610 .unlocked_ioctl = snd_pcm_playback_ioctl,
3611 .compat_ioctl = snd_pcm_ioctl_compat,
3612 .mmap = snd_pcm_mmap,
3613 .fasync = snd_pcm_fasync,
3614 .get_unmapped_area = snd_pcm_get_unmapped_area,
3615 },
3616 {
3617 .owner = THIS_MODULE,
3618 .read = snd_pcm_read,
3619 .aio_read = snd_pcm_aio_read,
3620 .open = snd_pcm_capture_open,
3621 .release = snd_pcm_release,
3622 .llseek = no_llseek,
3623 .poll = snd_pcm_capture_poll,
3624 .unlocked_ioctl = snd_pcm_capture_ioctl,
3625 .compat_ioctl = snd_pcm_ioctl_compat,
3626 .mmap = snd_pcm_mmap,
3627 .fasync = snd_pcm_fasync,
3628 .get_unmapped_area = snd_pcm_get_unmapped_area,
3629 }
3630 };
Linux with added FPC-III support