Loading...
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
46struct 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
66static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70#endif
71static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73/*
74 *
75 */
76
77DEFINE_RWLOCK(snd_pcm_link_rwlock);
78EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82static inline mm_segment_t snd_enter_user(void)
83{
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87}
88
89static inline void snd_leave_user(mm_segment_t fs)
90{
91 set_fs(fs);
92}
93
94
95
96int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97{
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121}
122
123int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125{
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139}
140
141#undef RULES_DEBUG
142
143#ifdef RULES_DEBUG
144#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161};
162#endif
163
164int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166{
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192#ifdef RULES_DEBUG
193 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
194 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195#endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197#ifdef RULES_DEBUG
198 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199#endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212#ifdef RULES_DEBUG
213 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 pr_cont("empty");
216 else
217 pr_cont("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 pr_cont(" -> ");
221#endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223#ifdef RULES_DEBUG
224 if (i->empty)
225 pr_cont("empty\n");
226 else
227 pr_cont("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230#endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257#ifdef RULES_DEBUG
258 pr_debug("Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 pr_cont("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 pr_cont("empty");
268 else
269 pr_cont("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274#endif
275 changed = r->func(params, r);
276#ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 pr_cont(" -> ");
279 if (hw_is_mask(r->var))
280 pr_cont("%x", *m->bits);
281 else {
282 if (i->empty)
283 pr_cont("empty");
284 else
285 pr_cont("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 pr_cont("\n");
291#endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333}
334
335EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339{
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355}
356
357static int period_to_usecs(struct snd_pcm_runtime *runtime)
358{
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370}
371
372static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
373{
374 snd_pcm_stream_lock_irq(substream);
375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
376 substream->runtime->status->state = state;
377 snd_pcm_stream_unlock_irq(substream);
378}
379
380static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *params)
382{
383 struct snd_pcm_runtime *runtime;
384 int err, usecs;
385 unsigned int bits;
386 snd_pcm_uframes_t frames;
387
388 if (PCM_RUNTIME_CHECK(substream))
389 return -ENXIO;
390 runtime = substream->runtime;
391 snd_pcm_stream_lock_irq(substream);
392 switch (runtime->status->state) {
393 case SNDRV_PCM_STATE_OPEN:
394 case SNDRV_PCM_STATE_SETUP:
395 case SNDRV_PCM_STATE_PREPARED:
396 break;
397 default:
398 snd_pcm_stream_unlock_irq(substream);
399 return -EBADFD;
400 }
401 snd_pcm_stream_unlock_irq(substream);
402#if IS_ENABLED(CONFIG_SND_PCM_OSS)
403 if (!substream->oss.oss)
404#endif
405 if (atomic_read(&substream->mmap_count))
406 return -EBADFD;
407
408 params->rmask = ~0U;
409 err = snd_pcm_hw_refine(substream, params);
410 if (err < 0)
411 goto _error;
412
413 err = snd_pcm_hw_params_choose(substream, params);
414 if (err < 0)
415 goto _error;
416
417 if (substream->ops->hw_params != NULL) {
418 err = substream->ops->hw_params(substream, params);
419 if (err < 0)
420 goto _error;
421 }
422
423 runtime->access = params_access(params);
424 runtime->format = params_format(params);
425 runtime->subformat = params_subformat(params);
426 runtime->channels = params_channels(params);
427 runtime->rate = params_rate(params);
428 runtime->period_size = params_period_size(params);
429 runtime->periods = params_periods(params);
430 runtime->buffer_size = params_buffer_size(params);
431 runtime->info = params->info;
432 runtime->rate_num = params->rate_num;
433 runtime->rate_den = params->rate_den;
434 runtime->no_period_wakeup =
435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
437
438 bits = snd_pcm_format_physical_width(runtime->format);
439 runtime->sample_bits = bits;
440 bits *= runtime->channels;
441 runtime->frame_bits = bits;
442 frames = 1;
443 while (bits % 8 != 0) {
444 bits *= 2;
445 frames *= 2;
446 }
447 runtime->byte_align = bits / 8;
448 runtime->min_align = frames;
449
450 /* Default sw params */
451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
452 runtime->period_step = 1;
453 runtime->control->avail_min = runtime->period_size;
454 runtime->start_threshold = 1;
455 runtime->stop_threshold = runtime->buffer_size;
456 runtime->silence_threshold = 0;
457 runtime->silence_size = 0;
458 runtime->boundary = runtime->buffer_size;
459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
460 runtime->boundary *= 2;
461
462 snd_pcm_timer_resolution_change(substream);
463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
464
465 if (pm_qos_request_active(&substream->latency_pm_qos_req))
466 pm_qos_remove_request(&substream->latency_pm_qos_req);
467 if ((usecs = period_to_usecs(runtime)) >= 0)
468 pm_qos_add_request(&substream->latency_pm_qos_req,
469 PM_QOS_CPU_DMA_LATENCY, usecs);
470 return 0;
471 _error:
472 /* hardware might be unusable from this time,
473 so we force application to retry to set
474 the correct hardware parameter settings */
475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
476 if (substream->ops->hw_free != NULL)
477 substream->ops->hw_free(substream);
478 return err;
479}
480
481static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params __user * _params)
483{
484 struct snd_pcm_hw_params *params;
485 int err;
486
487 params = memdup_user(_params, sizeof(*params));
488 if (IS_ERR(params))
489 return PTR_ERR(params);
490
491 err = snd_pcm_hw_params(substream, params);
492 if (copy_to_user(_params, params, sizeof(*params))) {
493 if (!err)
494 err = -EFAULT;
495 }
496
497 kfree(params);
498 return err;
499}
500
501static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
502{
503 struct snd_pcm_runtime *runtime;
504 int result = 0;
505
506 if (PCM_RUNTIME_CHECK(substream))
507 return -ENXIO;
508 runtime = substream->runtime;
509 snd_pcm_stream_lock_irq(substream);
510 switch (runtime->status->state) {
511 case SNDRV_PCM_STATE_SETUP:
512 case SNDRV_PCM_STATE_PREPARED:
513 break;
514 default:
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519 if (atomic_read(&substream->mmap_count))
520 return -EBADFD;
521 if (substream->ops->hw_free)
522 result = substream->ops->hw_free(substream);
523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
524 pm_qos_remove_request(&substream->latency_pm_qos_req);
525 return result;
526}
527
528static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
529 struct snd_pcm_sw_params *params)
530{
531 struct snd_pcm_runtime *runtime;
532 int err;
533
534 if (PCM_RUNTIME_CHECK(substream))
535 return -ENXIO;
536 runtime = substream->runtime;
537 snd_pcm_stream_lock_irq(substream);
538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
539 snd_pcm_stream_unlock_irq(substream);
540 return -EBADFD;
541 }
542 snd_pcm_stream_unlock_irq(substream);
543
544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
545 return -EINVAL;
546 if (params->avail_min == 0)
547 return -EINVAL;
548 if (params->silence_size >= runtime->boundary) {
549 if (params->silence_threshold != 0)
550 return -EINVAL;
551 } else {
552 if (params->silence_size > params->silence_threshold)
553 return -EINVAL;
554 if (params->silence_threshold > runtime->buffer_size)
555 return -EINVAL;
556 }
557 err = 0;
558 snd_pcm_stream_lock_irq(substream);
559 runtime->tstamp_mode = params->tstamp_mode;
560 runtime->period_step = params->period_step;
561 runtime->control->avail_min = params->avail_min;
562 runtime->start_threshold = params->start_threshold;
563 runtime->stop_threshold = params->stop_threshold;
564 runtime->silence_threshold = params->silence_threshold;
565 runtime->silence_size = params->silence_size;
566 params->boundary = runtime->boundary;
567 if (snd_pcm_running(substream)) {
568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
569 runtime->silence_size > 0)
570 snd_pcm_playback_silence(substream, ULONG_MAX);
571 err = snd_pcm_update_state(substream, runtime);
572 }
573 snd_pcm_stream_unlock_irq(substream);
574 return err;
575}
576
577static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_sw_params __user * _params)
579{
580 struct snd_pcm_sw_params params;
581 int err;
582 if (copy_from_user(¶ms, _params, sizeof(params)))
583 return -EFAULT;
584 err = snd_pcm_sw_params(substream, ¶ms);
585 if (copy_to_user(_params, ¶ms, sizeof(params)))
586 return -EFAULT;
587 return err;
588}
589
590int snd_pcm_status(struct snd_pcm_substream *substream,
591 struct snd_pcm_status *status)
592{
593 struct snd_pcm_runtime *runtime = substream->runtime;
594
595 snd_pcm_stream_lock_irq(substream);
596 status->state = runtime->status->state;
597 status->suspended_state = runtime->status->suspended_state;
598 if (status->state == SNDRV_PCM_STATE_OPEN)
599 goto _end;
600 status->trigger_tstamp = runtime->trigger_tstamp;
601 if (snd_pcm_running(substream)) {
602 snd_pcm_update_hw_ptr(substream);
603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
604 status->tstamp = runtime->status->tstamp;
605 status->audio_tstamp =
606 runtime->status->audio_tstamp;
607 goto _tstamp_end;
608 }
609 }
610 snd_pcm_gettime(runtime, &status->tstamp);
611 _tstamp_end:
612 status->appl_ptr = runtime->control->appl_ptr;
613 status->hw_ptr = runtime->status->hw_ptr;
614 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
615 status->avail = snd_pcm_playback_avail(runtime);
616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
617 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
618 status->delay = runtime->buffer_size - status->avail;
619 status->delay += runtime->delay;
620 } else
621 status->delay = 0;
622 } else {
623 status->avail = snd_pcm_capture_avail(runtime);
624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
625 status->delay = status->avail + runtime->delay;
626 else
627 status->delay = 0;
628 }
629 status->avail_max = runtime->avail_max;
630 status->overrange = runtime->overrange;
631 runtime->avail_max = 0;
632 runtime->overrange = 0;
633 _end:
634 snd_pcm_stream_unlock_irq(substream);
635 return 0;
636}
637
638static int snd_pcm_status_user(struct snd_pcm_substream *substream,
639 struct snd_pcm_status __user * _status)
640{
641 struct snd_pcm_status status;
642 int res;
643
644 memset(&status, 0, sizeof(status));
645 res = snd_pcm_status(substream, &status);
646 if (res < 0)
647 return res;
648 if (copy_to_user(_status, &status, sizeof(status)))
649 return -EFAULT;
650 return 0;
651}
652
653static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
654 struct snd_pcm_channel_info * info)
655{
656 struct snd_pcm_runtime *runtime;
657 unsigned int channel;
658
659 channel = info->channel;
660 runtime = substream->runtime;
661 snd_pcm_stream_lock_irq(substream);
662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
663 snd_pcm_stream_unlock_irq(substream);
664 return -EBADFD;
665 }
666 snd_pcm_stream_unlock_irq(substream);
667 if (channel >= runtime->channels)
668 return -EINVAL;
669 memset(info, 0, sizeof(*info));
670 info->channel = channel;
671 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
672}
673
674static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
675 struct snd_pcm_channel_info __user * _info)
676{
677 struct snd_pcm_channel_info info;
678 int res;
679
680 if (copy_from_user(&info, _info, sizeof(info)))
681 return -EFAULT;
682 res = snd_pcm_channel_info(substream, &info);
683 if (res < 0)
684 return res;
685 if (copy_to_user(_info, &info, sizeof(info)))
686 return -EFAULT;
687 return 0;
688}
689
690static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
691{
692 struct snd_pcm_runtime *runtime = substream->runtime;
693 if (runtime->trigger_master == NULL)
694 return;
695 if (runtime->trigger_master == substream) {
696 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
697 } else {
698 snd_pcm_trigger_tstamp(runtime->trigger_master);
699 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
700 }
701 runtime->trigger_master = NULL;
702}
703
704struct action_ops {
705 int (*pre_action)(struct snd_pcm_substream *substream, int state);
706 int (*do_action)(struct snd_pcm_substream *substream, int state);
707 void (*undo_action)(struct snd_pcm_substream *substream, int state);
708 void (*post_action)(struct snd_pcm_substream *substream, int state);
709};
710
711/*
712 * this functions is core for handling of linked stream
713 * Note: the stream state might be changed also on failure
714 * Note2: call with calling stream lock + link lock
715 */
716static int snd_pcm_action_group(struct action_ops *ops,
717 struct snd_pcm_substream *substream,
718 int state, int do_lock)
719{
720 struct snd_pcm_substream *s = NULL;
721 struct snd_pcm_substream *s1;
722 int res = 0;
723
724 snd_pcm_group_for_each_entry(s, substream) {
725 if (do_lock && s != substream)
726 spin_lock_nested(&s->self_group.lock,
727 SINGLE_DEPTH_NESTING);
728 res = ops->pre_action(s, state);
729 if (res < 0)
730 goto _unlock;
731 }
732 snd_pcm_group_for_each_entry(s, substream) {
733 res = ops->do_action(s, state);
734 if (res < 0) {
735 if (ops->undo_action) {
736 snd_pcm_group_for_each_entry(s1, substream) {
737 if (s1 == s) /* failed stream */
738 break;
739 ops->undo_action(s1, state);
740 }
741 }
742 s = NULL; /* unlock all */
743 goto _unlock;
744 }
745 }
746 snd_pcm_group_for_each_entry(s, substream) {
747 ops->post_action(s, state);
748 }
749 _unlock:
750 if (do_lock) {
751 /* unlock streams */
752 snd_pcm_group_for_each_entry(s1, substream) {
753 if (s1 != substream)
754 spin_unlock(&s1->self_group.lock);
755 if (s1 == s) /* end */
756 break;
757 }
758 }
759 return res;
760}
761
762/*
763 * Note: call with stream lock
764 */
765static int snd_pcm_action_single(struct action_ops *ops,
766 struct snd_pcm_substream *substream,
767 int state)
768{
769 int res;
770
771 res = ops->pre_action(substream, state);
772 if (res < 0)
773 return res;
774 res = ops->do_action(substream, state);
775 if (res == 0)
776 ops->post_action(substream, state);
777 else if (ops->undo_action)
778 ops->undo_action(substream, state);
779 return res;
780}
781
782/*
783 * Note: call with stream lock
784 */
785static int snd_pcm_action(struct action_ops *ops,
786 struct snd_pcm_substream *substream,
787 int state)
788{
789 int res;
790
791 if (snd_pcm_stream_linked(substream)) {
792 if (!spin_trylock(&substream->group->lock)) {
793 spin_unlock(&substream->self_group.lock);
794 spin_lock(&substream->group->lock);
795 spin_lock(&substream->self_group.lock);
796 }
797 res = snd_pcm_action_group(ops, substream, state, 1);
798 spin_unlock(&substream->group->lock);
799 } else {
800 res = snd_pcm_action_single(ops, substream, state);
801 }
802 return res;
803}
804
805/*
806 * Note: don't use any locks before
807 */
808static int snd_pcm_action_lock_irq(struct action_ops *ops,
809 struct snd_pcm_substream *substream,
810 int state)
811{
812 int res;
813
814 read_lock_irq(&snd_pcm_link_rwlock);
815 if (snd_pcm_stream_linked(substream)) {
816 spin_lock(&substream->group->lock);
817 spin_lock(&substream->self_group.lock);
818 res = snd_pcm_action_group(ops, substream, state, 1);
819 spin_unlock(&substream->self_group.lock);
820 spin_unlock(&substream->group->lock);
821 } else {
822 spin_lock(&substream->self_group.lock);
823 res = snd_pcm_action_single(ops, substream, state);
824 spin_unlock(&substream->self_group.lock);
825 }
826 read_unlock_irq(&snd_pcm_link_rwlock);
827 return res;
828}
829
830/*
831 */
832static int snd_pcm_action_nonatomic(struct action_ops *ops,
833 struct snd_pcm_substream *substream,
834 int state)
835{
836 int res;
837
838 down_read(&snd_pcm_link_rwsem);
839 if (snd_pcm_stream_linked(substream))
840 res = snd_pcm_action_group(ops, substream, state, 0);
841 else
842 res = snd_pcm_action_single(ops, substream, state);
843 up_read(&snd_pcm_link_rwsem);
844 return res;
845}
846
847/*
848 * start callbacks
849 */
850static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
851{
852 struct snd_pcm_runtime *runtime = substream->runtime;
853 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
854 return -EBADFD;
855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
856 !snd_pcm_playback_data(substream))
857 return -EPIPE;
858 runtime->trigger_master = substream;
859 return 0;
860}
861
862static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
863{
864 if (substream->runtime->trigger_master != substream)
865 return 0;
866 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
867}
868
869static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
870{
871 if (substream->runtime->trigger_master == substream)
872 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
873}
874
875static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
876{
877 struct snd_pcm_runtime *runtime = substream->runtime;
878 snd_pcm_trigger_tstamp(substream);
879 runtime->hw_ptr_jiffies = jiffies;
880 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
881 runtime->rate;
882 runtime->status->state = state;
883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
884 runtime->silence_size > 0)
885 snd_pcm_playback_silence(substream, ULONG_MAX);
886 if (substream->timer)
887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
888 &runtime->trigger_tstamp);
889}
890
891static struct action_ops snd_pcm_action_start = {
892 .pre_action = snd_pcm_pre_start,
893 .do_action = snd_pcm_do_start,
894 .undo_action = snd_pcm_undo_start,
895 .post_action = snd_pcm_post_start
896};
897
898/**
899 * snd_pcm_start - start all linked streams
900 * @substream: the PCM substream instance
901 *
902 * Return: Zero if successful, or a negative error code.
903 */
904int snd_pcm_start(struct snd_pcm_substream *substream)
905{
906 return snd_pcm_action(&snd_pcm_action_start, substream,
907 SNDRV_PCM_STATE_RUNNING);
908}
909
910/*
911 * stop callbacks
912 */
913static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
914{
915 struct snd_pcm_runtime *runtime = substream->runtime;
916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
917 return -EBADFD;
918 runtime->trigger_master = substream;
919 return 0;
920}
921
922static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
923{
924 if (substream->runtime->trigger_master == substream &&
925 snd_pcm_running(substream))
926 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
927 return 0; /* unconditonally stop all substreams */
928}
929
930static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
931{
932 struct snd_pcm_runtime *runtime = substream->runtime;
933 if (runtime->status->state != state) {
934 snd_pcm_trigger_tstamp(substream);
935 if (substream->timer)
936 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
937 &runtime->trigger_tstamp);
938 runtime->status->state = state;
939 }
940 wake_up(&runtime->sleep);
941 wake_up(&runtime->tsleep);
942}
943
944static struct action_ops snd_pcm_action_stop = {
945 .pre_action = snd_pcm_pre_stop,
946 .do_action = snd_pcm_do_stop,
947 .post_action = snd_pcm_post_stop
948};
949
950/**
951 * snd_pcm_stop - try to stop all running streams in the substream group
952 * @substream: the PCM substream instance
953 * @state: PCM state after stopping the stream
954 *
955 * The state of each stream is then changed to the given state unconditionally.
956 *
957 * Return: Zero if successful, or a negative error code.
958 */
959int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
960{
961 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
962}
963
964EXPORT_SYMBOL(snd_pcm_stop);
965
966/**
967 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
968 * @substream: the PCM substream
969 *
970 * After stopping, the state is changed to SETUP.
971 * Unlike snd_pcm_stop(), this affects only the given stream.
972 *
973 * Return: Zero if succesful, or a negative error code.
974 */
975int snd_pcm_drain_done(struct snd_pcm_substream *substream)
976{
977 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
978 SNDRV_PCM_STATE_SETUP);
979}
980
981/*
982 * pause callbacks
983 */
984static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
985{
986 struct snd_pcm_runtime *runtime = substream->runtime;
987 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
988 return -ENOSYS;
989 if (push) {
990 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
991 return -EBADFD;
992 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
993 return -EBADFD;
994 runtime->trigger_master = substream;
995 return 0;
996}
997
998static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
999{
1000 if (substream->runtime->trigger_master != substream)
1001 return 0;
1002 /* some drivers might use hw_ptr to recover from the pause -
1003 update the hw_ptr now */
1004 if (push)
1005 snd_pcm_update_hw_ptr(substream);
1006 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1007 * a delta between the current jiffies, this gives a large enough
1008 * delta, effectively to skip the check once.
1009 */
1010 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1011 return substream->ops->trigger(substream,
1012 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1013 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1014}
1015
1016static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1017{
1018 if (substream->runtime->trigger_master == substream)
1019 substream->ops->trigger(substream,
1020 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1021 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1022}
1023
1024static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1025{
1026 struct snd_pcm_runtime *runtime = substream->runtime;
1027 snd_pcm_trigger_tstamp(substream);
1028 if (push) {
1029 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1030 if (substream->timer)
1031 snd_timer_notify(substream->timer,
1032 SNDRV_TIMER_EVENT_MPAUSE,
1033 &runtime->trigger_tstamp);
1034 wake_up(&runtime->sleep);
1035 wake_up(&runtime->tsleep);
1036 } else {
1037 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1038 if (substream->timer)
1039 snd_timer_notify(substream->timer,
1040 SNDRV_TIMER_EVENT_MCONTINUE,
1041 &runtime->trigger_tstamp);
1042 }
1043}
1044
1045static struct action_ops snd_pcm_action_pause = {
1046 .pre_action = snd_pcm_pre_pause,
1047 .do_action = snd_pcm_do_pause,
1048 .undo_action = snd_pcm_undo_pause,
1049 .post_action = snd_pcm_post_pause
1050};
1051
1052/*
1053 * Push/release the pause for all linked streams.
1054 */
1055static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1056{
1057 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1058}
1059
1060#ifdef CONFIG_PM
1061/* suspend */
1062
1063static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1064{
1065 struct snd_pcm_runtime *runtime = substream->runtime;
1066 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1067 return -EBUSY;
1068 runtime->trigger_master = substream;
1069 return 0;
1070}
1071
1072static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1073{
1074 struct snd_pcm_runtime *runtime = substream->runtime;
1075 if (runtime->trigger_master != substream)
1076 return 0;
1077 if (! snd_pcm_running(substream))
1078 return 0;
1079 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1080 return 0; /* suspend unconditionally */
1081}
1082
1083static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1084{
1085 struct snd_pcm_runtime *runtime = substream->runtime;
1086 snd_pcm_trigger_tstamp(substream);
1087 if (substream->timer)
1088 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1089 &runtime->trigger_tstamp);
1090 runtime->status->suspended_state = runtime->status->state;
1091 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1092 wake_up(&runtime->sleep);
1093 wake_up(&runtime->tsleep);
1094}
1095
1096static struct action_ops snd_pcm_action_suspend = {
1097 .pre_action = snd_pcm_pre_suspend,
1098 .do_action = snd_pcm_do_suspend,
1099 .post_action = snd_pcm_post_suspend
1100};
1101
1102/**
1103 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1104 * @substream: the PCM substream
1105 *
1106 * After this call, all streams are changed to SUSPENDED state.
1107 *
1108 * Return: Zero if successful (or @substream is %NULL), or a negative error
1109 * code.
1110 */
1111int snd_pcm_suspend(struct snd_pcm_substream *substream)
1112{
1113 int err;
1114 unsigned long flags;
1115
1116 if (! substream)
1117 return 0;
1118
1119 snd_pcm_stream_lock_irqsave(substream, flags);
1120 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1121 snd_pcm_stream_unlock_irqrestore(substream, flags);
1122 return err;
1123}
1124
1125EXPORT_SYMBOL(snd_pcm_suspend);
1126
1127/**
1128 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1129 * @pcm: the PCM instance
1130 *
1131 * After this call, all streams are changed to SUSPENDED state.
1132 *
1133 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1134 */
1135int snd_pcm_suspend_all(struct snd_pcm *pcm)
1136{
1137 struct snd_pcm_substream *substream;
1138 int stream, err = 0;
1139
1140 if (! pcm)
1141 return 0;
1142
1143 for (stream = 0; stream < 2; stream++) {
1144 for (substream = pcm->streams[stream].substream;
1145 substream; substream = substream->next) {
1146 /* FIXME: the open/close code should lock this as well */
1147 if (substream->runtime == NULL)
1148 continue;
1149 err = snd_pcm_suspend(substream);
1150 if (err < 0 && err != -EBUSY)
1151 return err;
1152 }
1153 }
1154 return 0;
1155}
1156
1157EXPORT_SYMBOL(snd_pcm_suspend_all);
1158
1159/* resume */
1160
1161static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1162{
1163 struct snd_pcm_runtime *runtime = substream->runtime;
1164 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1165 return -ENOSYS;
1166 runtime->trigger_master = substream;
1167 return 0;
1168}
1169
1170static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1171{
1172 struct snd_pcm_runtime *runtime = substream->runtime;
1173 if (runtime->trigger_master != substream)
1174 return 0;
1175 /* DMA not running previously? */
1176 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1177 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1178 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1179 return 0;
1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1181}
1182
1183static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1184{
1185 if (substream->runtime->trigger_master == substream &&
1186 snd_pcm_running(substream))
1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1188}
1189
1190static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1191{
1192 struct snd_pcm_runtime *runtime = substream->runtime;
1193 snd_pcm_trigger_tstamp(substream);
1194 if (substream->timer)
1195 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1196 &runtime->trigger_tstamp);
1197 runtime->status->state = runtime->status->suspended_state;
1198}
1199
1200static struct action_ops snd_pcm_action_resume = {
1201 .pre_action = snd_pcm_pre_resume,
1202 .do_action = snd_pcm_do_resume,
1203 .undo_action = snd_pcm_undo_resume,
1204 .post_action = snd_pcm_post_resume
1205};
1206
1207static int snd_pcm_resume(struct snd_pcm_substream *substream)
1208{
1209 struct snd_card *card = substream->pcm->card;
1210 int res;
1211
1212 snd_power_lock(card);
1213 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1214 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1215 snd_power_unlock(card);
1216 return res;
1217}
1218
1219#else
1220
1221static int snd_pcm_resume(struct snd_pcm_substream *substream)
1222{
1223 return -ENOSYS;
1224}
1225
1226#endif /* CONFIG_PM */
1227
1228/*
1229 * xrun ioctl
1230 *
1231 * Change the RUNNING stream(s) to XRUN state.
1232 */
1233static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1234{
1235 struct snd_card *card = substream->pcm->card;
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 int result;
1238
1239 snd_power_lock(card);
1240 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1241 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1242 if (result < 0)
1243 goto _unlock;
1244 }
1245
1246 snd_pcm_stream_lock_irq(substream);
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_XRUN:
1249 result = 0; /* already there */
1250 break;
1251 case SNDRV_PCM_STATE_RUNNING:
1252 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1253 break;
1254 default:
1255 result = -EBADFD;
1256 }
1257 snd_pcm_stream_unlock_irq(substream);
1258 _unlock:
1259 snd_power_unlock(card);
1260 return result;
1261}
1262
1263/*
1264 * reset ioctl
1265 */
1266static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1267{
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 switch (runtime->status->state) {
1270 case SNDRV_PCM_STATE_RUNNING:
1271 case SNDRV_PCM_STATE_PREPARED:
1272 case SNDRV_PCM_STATE_PAUSED:
1273 case SNDRV_PCM_STATE_SUSPENDED:
1274 return 0;
1275 default:
1276 return -EBADFD;
1277 }
1278}
1279
1280static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1281{
1282 struct snd_pcm_runtime *runtime = substream->runtime;
1283 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1284 if (err < 0)
1285 return err;
1286 runtime->hw_ptr_base = 0;
1287 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1288 runtime->status->hw_ptr % runtime->period_size;
1289 runtime->silence_start = runtime->status->hw_ptr;
1290 runtime->silence_filled = 0;
1291 return 0;
1292}
1293
1294static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1295{
1296 struct snd_pcm_runtime *runtime = substream->runtime;
1297 runtime->control->appl_ptr = runtime->status->hw_ptr;
1298 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1299 runtime->silence_size > 0)
1300 snd_pcm_playback_silence(substream, ULONG_MAX);
1301}
1302
1303static struct action_ops snd_pcm_action_reset = {
1304 .pre_action = snd_pcm_pre_reset,
1305 .do_action = snd_pcm_do_reset,
1306 .post_action = snd_pcm_post_reset
1307};
1308
1309static int snd_pcm_reset(struct snd_pcm_substream *substream)
1310{
1311 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1312}
1313
1314/*
1315 * prepare ioctl
1316 */
1317/* we use the second argument for updating f_flags */
1318static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1319 int f_flags)
1320{
1321 struct snd_pcm_runtime *runtime = substream->runtime;
1322 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1323 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1324 return -EBADFD;
1325 if (snd_pcm_running(substream))
1326 return -EBUSY;
1327 substream->f_flags = f_flags;
1328 return 0;
1329}
1330
1331static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1332{
1333 int err;
1334 err = substream->ops->prepare(substream);
1335 if (err < 0)
1336 return err;
1337 return snd_pcm_do_reset(substream, 0);
1338}
1339
1340static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1341{
1342 struct snd_pcm_runtime *runtime = substream->runtime;
1343 runtime->control->appl_ptr = runtime->status->hw_ptr;
1344 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1345}
1346
1347static struct action_ops snd_pcm_action_prepare = {
1348 .pre_action = snd_pcm_pre_prepare,
1349 .do_action = snd_pcm_do_prepare,
1350 .post_action = snd_pcm_post_prepare
1351};
1352
1353/**
1354 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1355 * @substream: the PCM substream instance
1356 * @file: file to refer f_flags
1357 *
1358 * Return: Zero if successful, or a negative error code.
1359 */
1360static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1361 struct file *file)
1362{
1363 int res;
1364 struct snd_card *card = substream->pcm->card;
1365 int f_flags;
1366
1367 if (file)
1368 f_flags = file->f_flags;
1369 else
1370 f_flags = substream->f_flags;
1371
1372 snd_power_lock(card);
1373 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1374 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1375 substream, f_flags);
1376 snd_power_unlock(card);
1377 return res;
1378}
1379
1380/*
1381 * drain ioctl
1382 */
1383
1384static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1385{
1386 struct snd_pcm_runtime *runtime = substream->runtime;
1387 switch (runtime->status->state) {
1388 case SNDRV_PCM_STATE_OPEN:
1389 case SNDRV_PCM_STATE_DISCONNECTED:
1390 case SNDRV_PCM_STATE_SUSPENDED:
1391 return -EBADFD;
1392 }
1393 runtime->trigger_master = substream;
1394 return 0;
1395}
1396
1397static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1398{
1399 struct snd_pcm_runtime *runtime = substream->runtime;
1400 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1401 switch (runtime->status->state) {
1402 case SNDRV_PCM_STATE_PREPARED:
1403 /* start playback stream if possible */
1404 if (! snd_pcm_playback_empty(substream)) {
1405 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1406 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1407 }
1408 break;
1409 case SNDRV_PCM_STATE_RUNNING:
1410 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1411 break;
1412 case SNDRV_PCM_STATE_XRUN:
1413 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1414 break;
1415 default:
1416 break;
1417 }
1418 } else {
1419 /* stop running stream */
1420 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1421 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1422 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1423 snd_pcm_do_stop(substream, new_state);
1424 snd_pcm_post_stop(substream, new_state);
1425 }
1426 }
1427 return 0;
1428}
1429
1430static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1431{
1432}
1433
1434static struct action_ops snd_pcm_action_drain_init = {
1435 .pre_action = snd_pcm_pre_drain_init,
1436 .do_action = snd_pcm_do_drain_init,
1437 .post_action = snd_pcm_post_drain_init
1438};
1439
1440static int snd_pcm_drop(struct snd_pcm_substream *substream);
1441
1442/*
1443 * Drain the stream(s).
1444 * When the substream is linked, sync until the draining of all playback streams
1445 * is finished.
1446 * After this call, all streams are supposed to be either SETUP or DRAINING
1447 * (capture only) state.
1448 */
1449static int snd_pcm_drain(struct snd_pcm_substream *substream,
1450 struct file *file)
1451{
1452 struct snd_card *card;
1453 struct snd_pcm_runtime *runtime;
1454 struct snd_pcm_substream *s;
1455 wait_queue_t wait;
1456 int result = 0;
1457 int nonblock = 0;
1458
1459 card = substream->pcm->card;
1460 runtime = substream->runtime;
1461
1462 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1463 return -EBADFD;
1464
1465 snd_power_lock(card);
1466 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1467 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1468 if (result < 0) {
1469 snd_power_unlock(card);
1470 return result;
1471 }
1472 }
1473
1474 if (file) {
1475 if (file->f_flags & O_NONBLOCK)
1476 nonblock = 1;
1477 } else if (substream->f_flags & O_NONBLOCK)
1478 nonblock = 1;
1479
1480 down_read(&snd_pcm_link_rwsem);
1481 snd_pcm_stream_lock_irq(substream);
1482 /* resume pause */
1483 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1484 snd_pcm_pause(substream, 0);
1485
1486 /* pre-start/stop - all running streams are changed to DRAINING state */
1487 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1488 if (result < 0)
1489 goto unlock;
1490 /* in non-blocking, we don't wait in ioctl but let caller poll */
1491 if (nonblock) {
1492 result = -EAGAIN;
1493 goto unlock;
1494 }
1495
1496 for (;;) {
1497 long tout;
1498 struct snd_pcm_runtime *to_check;
1499 if (signal_pending(current)) {
1500 result = -ERESTARTSYS;
1501 break;
1502 }
1503 /* find a substream to drain */
1504 to_check = NULL;
1505 snd_pcm_group_for_each_entry(s, substream) {
1506 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1507 continue;
1508 runtime = s->runtime;
1509 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1510 to_check = runtime;
1511 break;
1512 }
1513 }
1514 if (!to_check)
1515 break; /* all drained */
1516 init_waitqueue_entry(&wait, current);
1517 add_wait_queue(&to_check->sleep, &wait);
1518 snd_pcm_stream_unlock_irq(substream);
1519 up_read(&snd_pcm_link_rwsem);
1520 snd_power_unlock(card);
1521 if (runtime->no_period_wakeup)
1522 tout = MAX_SCHEDULE_TIMEOUT;
1523 else {
1524 tout = 10;
1525 if (runtime->rate) {
1526 long t = runtime->period_size * 2 / runtime->rate;
1527 tout = max(t, tout);
1528 }
1529 tout = msecs_to_jiffies(tout * 1000);
1530 }
1531 tout = schedule_timeout_interruptible(tout);
1532 snd_power_lock(card);
1533 down_read(&snd_pcm_link_rwsem);
1534 snd_pcm_stream_lock_irq(substream);
1535 remove_wait_queue(&to_check->sleep, &wait);
1536 if (card->shutdown) {
1537 result = -ENODEV;
1538 break;
1539 }
1540 if (tout == 0) {
1541 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1542 result = -ESTRPIPE;
1543 else {
1544 dev_dbg(substream->pcm->card->dev,
1545 "playback drain error (DMA or IRQ trouble?)\n");
1546 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1547 result = -EIO;
1548 }
1549 break;
1550 }
1551 }
1552
1553 unlock:
1554 snd_pcm_stream_unlock_irq(substream);
1555 up_read(&snd_pcm_link_rwsem);
1556 snd_power_unlock(card);
1557
1558 return result;
1559}
1560
1561/*
1562 * drop ioctl
1563 *
1564 * Immediately put all linked substreams into SETUP state.
1565 */
1566static int snd_pcm_drop(struct snd_pcm_substream *substream)
1567{
1568 struct snd_pcm_runtime *runtime;
1569 int result = 0;
1570
1571 if (PCM_RUNTIME_CHECK(substream))
1572 return -ENXIO;
1573 runtime = substream->runtime;
1574
1575 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1576 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1577 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1578 return -EBADFD;
1579
1580 snd_pcm_stream_lock_irq(substream);
1581 /* resume pause */
1582 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1583 snd_pcm_pause(substream, 0);
1584
1585 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1586 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1587 snd_pcm_stream_unlock_irq(substream);
1588
1589 return result;
1590}
1591
1592
1593static bool is_pcm_file(struct file *file)
1594{
1595 struct inode *inode = file_inode(file);
1596 unsigned int minor;
1597
1598 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1599 return false;
1600 minor = iminor(inode);
1601 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1602 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1603}
1604
1605/*
1606 * PCM link handling
1607 */
1608static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1609{
1610 int res = 0;
1611 struct snd_pcm_file *pcm_file;
1612 struct snd_pcm_substream *substream1;
1613 struct snd_pcm_group *group;
1614 struct fd f = fdget(fd);
1615
1616 if (!f.file)
1617 return -EBADFD;
1618 if (!is_pcm_file(f.file)) {
1619 res = -EBADFD;
1620 goto _badf;
1621 }
1622 pcm_file = f.file->private_data;
1623 substream1 = pcm_file->substream;
1624 group = kmalloc(sizeof(*group), GFP_KERNEL);
1625 if (!group) {
1626 res = -ENOMEM;
1627 goto _nolock;
1628 }
1629 down_write(&snd_pcm_link_rwsem);
1630 write_lock_irq(&snd_pcm_link_rwlock);
1631 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1632 substream->runtime->status->state != substream1->runtime->status->state) {
1633 res = -EBADFD;
1634 goto _end;
1635 }
1636 if (snd_pcm_stream_linked(substream1)) {
1637 res = -EALREADY;
1638 goto _end;
1639 }
1640 if (!snd_pcm_stream_linked(substream)) {
1641 substream->group = group;
1642 group = NULL;
1643 spin_lock_init(&substream->group->lock);
1644 INIT_LIST_HEAD(&substream->group->substreams);
1645 list_add_tail(&substream->link_list, &substream->group->substreams);
1646 substream->group->count = 1;
1647 }
1648 list_add_tail(&substream1->link_list, &substream->group->substreams);
1649 substream->group->count++;
1650 substream1->group = substream->group;
1651 _end:
1652 write_unlock_irq(&snd_pcm_link_rwlock);
1653 up_write(&snd_pcm_link_rwsem);
1654 _nolock:
1655 snd_card_unref(substream1->pcm->card);
1656 kfree(group);
1657 _badf:
1658 fdput(f);
1659 return res;
1660}
1661
1662static void relink_to_local(struct snd_pcm_substream *substream)
1663{
1664 substream->group = &substream->self_group;
1665 INIT_LIST_HEAD(&substream->self_group.substreams);
1666 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1667}
1668
1669static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1670{
1671 struct snd_pcm_substream *s;
1672 int res = 0;
1673
1674 down_write(&snd_pcm_link_rwsem);
1675 write_lock_irq(&snd_pcm_link_rwlock);
1676 if (!snd_pcm_stream_linked(substream)) {
1677 res = -EALREADY;
1678 goto _end;
1679 }
1680 list_del(&substream->link_list);
1681 substream->group->count--;
1682 if (substream->group->count == 1) { /* detach the last stream, too */
1683 snd_pcm_group_for_each_entry(s, substream) {
1684 relink_to_local(s);
1685 break;
1686 }
1687 kfree(substream->group);
1688 }
1689 relink_to_local(substream);
1690 _end:
1691 write_unlock_irq(&snd_pcm_link_rwlock);
1692 up_write(&snd_pcm_link_rwsem);
1693 return res;
1694}
1695
1696/*
1697 * hw configurator
1698 */
1699static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1700 struct snd_pcm_hw_rule *rule)
1701{
1702 struct snd_interval t;
1703 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1704 hw_param_interval_c(params, rule->deps[1]), &t);
1705 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1706}
1707
1708static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1709 struct snd_pcm_hw_rule *rule)
1710{
1711 struct snd_interval t;
1712 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1713 hw_param_interval_c(params, rule->deps[1]), &t);
1714 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1715}
1716
1717static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1718 struct snd_pcm_hw_rule *rule)
1719{
1720 struct snd_interval t;
1721 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1722 hw_param_interval_c(params, rule->deps[1]),
1723 (unsigned long) rule->private, &t);
1724 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1725}
1726
1727static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1728 struct snd_pcm_hw_rule *rule)
1729{
1730 struct snd_interval t;
1731 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1732 (unsigned long) rule->private,
1733 hw_param_interval_c(params, rule->deps[1]), &t);
1734 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1735}
1736
1737static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1738 struct snd_pcm_hw_rule *rule)
1739{
1740 unsigned int k;
1741 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1742 struct snd_mask m;
1743 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1744 snd_mask_any(&m);
1745 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1746 int bits;
1747 if (! snd_mask_test(mask, k))
1748 continue;
1749 bits = snd_pcm_format_physical_width(k);
1750 if (bits <= 0)
1751 continue; /* ignore invalid formats */
1752 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1753 snd_mask_reset(&m, k);
1754 }
1755 return snd_mask_refine(mask, &m);
1756}
1757
1758static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1759 struct snd_pcm_hw_rule *rule)
1760{
1761 struct snd_interval t;
1762 unsigned int k;
1763 t.min = UINT_MAX;
1764 t.max = 0;
1765 t.openmin = 0;
1766 t.openmax = 0;
1767 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1768 int bits;
1769 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1770 continue;
1771 bits = snd_pcm_format_physical_width(k);
1772 if (bits <= 0)
1773 continue; /* ignore invalid formats */
1774 if (t.min > (unsigned)bits)
1775 t.min = bits;
1776 if (t.max < (unsigned)bits)
1777 t.max = bits;
1778 }
1779 t.integer = 1;
1780 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1781}
1782
1783#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1784#error "Change this table"
1785#endif
1786
1787static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1788 48000, 64000, 88200, 96000, 176400, 192000 };
1789
1790const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1791 .count = ARRAY_SIZE(rates),
1792 .list = rates,
1793};
1794
1795static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1796 struct snd_pcm_hw_rule *rule)
1797{
1798 struct snd_pcm_hardware *hw = rule->private;
1799 return snd_interval_list(hw_param_interval(params, rule->var),
1800 snd_pcm_known_rates.count,
1801 snd_pcm_known_rates.list, hw->rates);
1802}
1803
1804static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1805 struct snd_pcm_hw_rule *rule)
1806{
1807 struct snd_interval t;
1808 struct snd_pcm_substream *substream = rule->private;
1809 t.min = 0;
1810 t.max = substream->buffer_bytes_max;
1811 t.openmin = 0;
1812 t.openmax = 0;
1813 t.integer = 1;
1814 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1815}
1816
1817int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1818{
1819 struct snd_pcm_runtime *runtime = substream->runtime;
1820 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1821 int k, err;
1822
1823 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1824 snd_mask_any(constrs_mask(constrs, k));
1825 }
1826
1827 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1828 snd_interval_any(constrs_interval(constrs, k));
1829 }
1830
1831 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1832 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1833 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1834 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1835 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1836
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1838 snd_pcm_hw_rule_format, NULL,
1839 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1843 snd_pcm_hw_rule_sample_bits, NULL,
1844 SNDRV_PCM_HW_PARAM_FORMAT,
1845 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1846 if (err < 0)
1847 return err;
1848 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1849 snd_pcm_hw_rule_div, NULL,
1850 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1851 if (err < 0)
1852 return err;
1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1854 snd_pcm_hw_rule_mul, NULL,
1855 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1856 if (err < 0)
1857 return err;
1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1860 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1861 if (err < 0)
1862 return err;
1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1864 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1866 if (err < 0)
1867 return err;
1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1869 snd_pcm_hw_rule_div, NULL,
1870 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1871 if (err < 0)
1872 return err;
1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1874 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1875 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1876 if (err < 0)
1877 return err;
1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1879 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1880 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1881 if (err < 0)
1882 return err;
1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1884 snd_pcm_hw_rule_div, NULL,
1885 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1886 if (err < 0)
1887 return err;
1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1889 snd_pcm_hw_rule_div, NULL,
1890 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1891 if (err < 0)
1892 return err;
1893 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1895 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896 if (err < 0)
1897 return err;
1898 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1899 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1900 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1901 if (err < 0)
1902 return err;
1903 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1904 snd_pcm_hw_rule_mul, NULL,
1905 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1906 if (err < 0)
1907 return err;
1908 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1910 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1911 if (err < 0)
1912 return err;
1913 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1914 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1915 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1916 if (err < 0)
1917 return err;
1918 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1919 snd_pcm_hw_rule_muldivk, (void*) 8,
1920 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1921 if (err < 0)
1922 return err;
1923 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1924 snd_pcm_hw_rule_muldivk, (void*) 8,
1925 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1926 if (err < 0)
1927 return err;
1928 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1929 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1930 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1931 if (err < 0)
1932 return err;
1933 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1934 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1935 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1936 if (err < 0)
1937 return err;
1938 return 0;
1939}
1940
1941int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1942{
1943 struct snd_pcm_runtime *runtime = substream->runtime;
1944 struct snd_pcm_hardware *hw = &runtime->hw;
1945 int err;
1946 unsigned int mask = 0;
1947
1948 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1949 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1950 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1951 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1952 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1953 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1954 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1955 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1956 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1957 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1958 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1959 }
1960 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1961 if (err < 0)
1962 return err;
1963
1964 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1965 if (err < 0)
1966 return err;
1967
1968 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1969 if (err < 0)
1970 return err;
1971
1972 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1973 hw->channels_min, hw->channels_max);
1974 if (err < 0)
1975 return err;
1976
1977 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1978 hw->rate_min, hw->rate_max);
1979 if (err < 0)
1980 return err;
1981
1982 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1983 hw->period_bytes_min, hw->period_bytes_max);
1984 if (err < 0)
1985 return err;
1986
1987 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1988 hw->periods_min, hw->periods_max);
1989 if (err < 0)
1990 return err;
1991
1992 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1993 hw->period_bytes_min, hw->buffer_bytes_max);
1994 if (err < 0)
1995 return err;
1996
1997 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1998 snd_pcm_hw_rule_buffer_bytes_max, substream,
1999 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2000 if (err < 0)
2001 return err;
2002
2003 /* FIXME: remove */
2004 if (runtime->dma_bytes) {
2005 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2006 if (err < 0)
2007 return err;
2008 }
2009
2010 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2011 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2012 snd_pcm_hw_rule_rate, hw,
2013 SNDRV_PCM_HW_PARAM_RATE, -1);
2014 if (err < 0)
2015 return err;
2016 }
2017
2018 /* FIXME: this belong to lowlevel */
2019 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2020
2021 return 0;
2022}
2023
2024static void pcm_release_private(struct snd_pcm_substream *substream)
2025{
2026 snd_pcm_unlink(substream);
2027}
2028
2029void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2030{
2031 substream->ref_count--;
2032 if (substream->ref_count > 0)
2033 return;
2034
2035 snd_pcm_drop(substream);
2036 if (substream->hw_opened) {
2037 if (substream->ops->hw_free != NULL)
2038 substream->ops->hw_free(substream);
2039 substream->ops->close(substream);
2040 substream->hw_opened = 0;
2041 }
2042 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2043 pm_qos_remove_request(&substream->latency_pm_qos_req);
2044 if (substream->pcm_release) {
2045 substream->pcm_release(substream);
2046 substream->pcm_release = NULL;
2047 }
2048 snd_pcm_detach_substream(substream);
2049}
2050
2051EXPORT_SYMBOL(snd_pcm_release_substream);
2052
2053int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2054 struct file *file,
2055 struct snd_pcm_substream **rsubstream)
2056{
2057 struct snd_pcm_substream *substream;
2058 int err;
2059
2060 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2061 if (err < 0)
2062 return err;
2063 if (substream->ref_count > 1) {
2064 *rsubstream = substream;
2065 return 0;
2066 }
2067
2068 err = snd_pcm_hw_constraints_init(substream);
2069 if (err < 0) {
2070 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2071 goto error;
2072 }
2073
2074 if ((err = substream->ops->open(substream)) < 0)
2075 goto error;
2076
2077 substream->hw_opened = 1;
2078
2079 err = snd_pcm_hw_constraints_complete(substream);
2080 if (err < 0) {
2081 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2082 goto error;
2083 }
2084
2085 *rsubstream = substream;
2086 return 0;
2087
2088 error:
2089 snd_pcm_release_substream(substream);
2090 return err;
2091}
2092
2093EXPORT_SYMBOL(snd_pcm_open_substream);
2094
2095static int snd_pcm_open_file(struct file *file,
2096 struct snd_pcm *pcm,
2097 int stream)
2098{
2099 struct snd_pcm_file *pcm_file;
2100 struct snd_pcm_substream *substream;
2101 int err;
2102
2103 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2104 if (err < 0)
2105 return err;
2106
2107 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2108 if (pcm_file == NULL) {
2109 snd_pcm_release_substream(substream);
2110 return -ENOMEM;
2111 }
2112 pcm_file->substream = substream;
2113 if (substream->ref_count == 1) {
2114 substream->file = pcm_file;
2115 substream->pcm_release = pcm_release_private;
2116 }
2117 file->private_data = pcm_file;
2118
2119 return 0;
2120}
2121
2122static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2123{
2124 struct snd_pcm *pcm;
2125 int err = nonseekable_open(inode, file);
2126 if (err < 0)
2127 return err;
2128 pcm = snd_lookup_minor_data(iminor(inode),
2129 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2130 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2131 if (pcm)
2132 snd_card_unref(pcm->card);
2133 return err;
2134}
2135
2136static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2137{
2138 struct snd_pcm *pcm;
2139 int err = nonseekable_open(inode, file);
2140 if (err < 0)
2141 return err;
2142 pcm = snd_lookup_minor_data(iminor(inode),
2143 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2144 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2145 if (pcm)
2146 snd_card_unref(pcm->card);
2147 return err;
2148}
2149
2150static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2151{
2152 int err;
2153 wait_queue_t wait;
2154
2155 if (pcm == NULL) {
2156 err = -ENODEV;
2157 goto __error1;
2158 }
2159 err = snd_card_file_add(pcm->card, file);
2160 if (err < 0)
2161 goto __error1;
2162 if (!try_module_get(pcm->card->module)) {
2163 err = -EFAULT;
2164 goto __error2;
2165 }
2166 init_waitqueue_entry(&wait, current);
2167 add_wait_queue(&pcm->open_wait, &wait);
2168 mutex_lock(&pcm->open_mutex);
2169 while (1) {
2170 err = snd_pcm_open_file(file, pcm, stream);
2171 if (err >= 0)
2172 break;
2173 if (err == -EAGAIN) {
2174 if (file->f_flags & O_NONBLOCK) {
2175 err = -EBUSY;
2176 break;
2177 }
2178 } else
2179 break;
2180 set_current_state(TASK_INTERRUPTIBLE);
2181 mutex_unlock(&pcm->open_mutex);
2182 schedule();
2183 mutex_lock(&pcm->open_mutex);
2184 if (pcm->card->shutdown) {
2185 err = -ENODEV;
2186 break;
2187 }
2188 if (signal_pending(current)) {
2189 err = -ERESTARTSYS;
2190 break;
2191 }
2192 }
2193 remove_wait_queue(&pcm->open_wait, &wait);
2194 mutex_unlock(&pcm->open_mutex);
2195 if (err < 0)
2196 goto __error;
2197 return err;
2198
2199 __error:
2200 module_put(pcm->card->module);
2201 __error2:
2202 snd_card_file_remove(pcm->card, file);
2203 __error1:
2204 return err;
2205}
2206
2207static int snd_pcm_release(struct inode *inode, struct file *file)
2208{
2209 struct snd_pcm *pcm;
2210 struct snd_pcm_substream *substream;
2211 struct snd_pcm_file *pcm_file;
2212
2213 pcm_file = file->private_data;
2214 substream = pcm_file->substream;
2215 if (snd_BUG_ON(!substream))
2216 return -ENXIO;
2217 pcm = substream->pcm;
2218 mutex_lock(&pcm->open_mutex);
2219 snd_pcm_release_substream(substream);
2220 kfree(pcm_file);
2221 mutex_unlock(&pcm->open_mutex);
2222 wake_up(&pcm->open_wait);
2223 module_put(pcm->card->module);
2224 snd_card_file_remove(pcm->card, file);
2225 return 0;
2226}
2227
2228static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2229 snd_pcm_uframes_t frames)
2230{
2231 struct snd_pcm_runtime *runtime = substream->runtime;
2232 snd_pcm_sframes_t appl_ptr;
2233 snd_pcm_sframes_t ret;
2234 snd_pcm_sframes_t hw_avail;
2235
2236 if (frames == 0)
2237 return 0;
2238
2239 snd_pcm_stream_lock_irq(substream);
2240 switch (runtime->status->state) {
2241 case SNDRV_PCM_STATE_PREPARED:
2242 break;
2243 case SNDRV_PCM_STATE_DRAINING:
2244 case SNDRV_PCM_STATE_RUNNING:
2245 if (snd_pcm_update_hw_ptr(substream) >= 0)
2246 break;
2247 /* Fall through */
2248 case SNDRV_PCM_STATE_XRUN:
2249 ret = -EPIPE;
2250 goto __end;
2251 case SNDRV_PCM_STATE_SUSPENDED:
2252 ret = -ESTRPIPE;
2253 goto __end;
2254 default:
2255 ret = -EBADFD;
2256 goto __end;
2257 }
2258
2259 hw_avail = snd_pcm_playback_hw_avail(runtime);
2260 if (hw_avail <= 0) {
2261 ret = 0;
2262 goto __end;
2263 }
2264 if (frames > (snd_pcm_uframes_t)hw_avail)
2265 frames = hw_avail;
2266 appl_ptr = runtime->control->appl_ptr - frames;
2267 if (appl_ptr < 0)
2268 appl_ptr += runtime->boundary;
2269 runtime->control->appl_ptr = appl_ptr;
2270 ret = frames;
2271 __end:
2272 snd_pcm_stream_unlock_irq(substream);
2273 return ret;
2274}
2275
2276static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2277 snd_pcm_uframes_t frames)
2278{
2279 struct snd_pcm_runtime *runtime = substream->runtime;
2280 snd_pcm_sframes_t appl_ptr;
2281 snd_pcm_sframes_t ret;
2282 snd_pcm_sframes_t hw_avail;
2283
2284 if (frames == 0)
2285 return 0;
2286
2287 snd_pcm_stream_lock_irq(substream);
2288 switch (runtime->status->state) {
2289 case SNDRV_PCM_STATE_PREPARED:
2290 case SNDRV_PCM_STATE_DRAINING:
2291 break;
2292 case SNDRV_PCM_STATE_RUNNING:
2293 if (snd_pcm_update_hw_ptr(substream) >= 0)
2294 break;
2295 /* Fall through */
2296 case SNDRV_PCM_STATE_XRUN:
2297 ret = -EPIPE;
2298 goto __end;
2299 case SNDRV_PCM_STATE_SUSPENDED:
2300 ret = -ESTRPIPE;
2301 goto __end;
2302 default:
2303 ret = -EBADFD;
2304 goto __end;
2305 }
2306
2307 hw_avail = snd_pcm_capture_hw_avail(runtime);
2308 if (hw_avail <= 0) {
2309 ret = 0;
2310 goto __end;
2311 }
2312 if (frames > (snd_pcm_uframes_t)hw_avail)
2313 frames = hw_avail;
2314 appl_ptr = runtime->control->appl_ptr - frames;
2315 if (appl_ptr < 0)
2316 appl_ptr += runtime->boundary;
2317 runtime->control->appl_ptr = appl_ptr;
2318 ret = frames;
2319 __end:
2320 snd_pcm_stream_unlock_irq(substream);
2321 return ret;
2322}
2323
2324static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2325 snd_pcm_uframes_t frames)
2326{
2327 struct snd_pcm_runtime *runtime = substream->runtime;
2328 snd_pcm_sframes_t appl_ptr;
2329 snd_pcm_sframes_t ret;
2330 snd_pcm_sframes_t avail;
2331
2332 if (frames == 0)
2333 return 0;
2334
2335 snd_pcm_stream_lock_irq(substream);
2336 switch (runtime->status->state) {
2337 case SNDRV_PCM_STATE_PREPARED:
2338 case SNDRV_PCM_STATE_PAUSED:
2339 break;
2340 case SNDRV_PCM_STATE_DRAINING:
2341 case SNDRV_PCM_STATE_RUNNING:
2342 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343 break;
2344 /* Fall through */
2345 case SNDRV_PCM_STATE_XRUN:
2346 ret = -EPIPE;
2347 goto __end;
2348 case SNDRV_PCM_STATE_SUSPENDED:
2349 ret = -ESTRPIPE;
2350 goto __end;
2351 default:
2352 ret = -EBADFD;
2353 goto __end;
2354 }
2355
2356 avail = snd_pcm_playback_avail(runtime);
2357 if (avail <= 0) {
2358 ret = 0;
2359 goto __end;
2360 }
2361 if (frames > (snd_pcm_uframes_t)avail)
2362 frames = avail;
2363 appl_ptr = runtime->control->appl_ptr + frames;
2364 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365 appl_ptr -= runtime->boundary;
2366 runtime->control->appl_ptr = appl_ptr;
2367 ret = frames;
2368 __end:
2369 snd_pcm_stream_unlock_irq(substream);
2370 return ret;
2371}
2372
2373static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2374 snd_pcm_uframes_t frames)
2375{
2376 struct snd_pcm_runtime *runtime = substream->runtime;
2377 snd_pcm_sframes_t appl_ptr;
2378 snd_pcm_sframes_t ret;
2379 snd_pcm_sframes_t avail;
2380
2381 if (frames == 0)
2382 return 0;
2383
2384 snd_pcm_stream_lock_irq(substream);
2385 switch (runtime->status->state) {
2386 case SNDRV_PCM_STATE_PREPARED:
2387 case SNDRV_PCM_STATE_DRAINING:
2388 case SNDRV_PCM_STATE_PAUSED:
2389 break;
2390 case SNDRV_PCM_STATE_RUNNING:
2391 if (snd_pcm_update_hw_ptr(substream) >= 0)
2392 break;
2393 /* Fall through */
2394 case SNDRV_PCM_STATE_XRUN:
2395 ret = -EPIPE;
2396 goto __end;
2397 case SNDRV_PCM_STATE_SUSPENDED:
2398 ret = -ESTRPIPE;
2399 goto __end;
2400 default:
2401 ret = -EBADFD;
2402 goto __end;
2403 }
2404
2405 avail = snd_pcm_capture_avail(runtime);
2406 if (avail <= 0) {
2407 ret = 0;
2408 goto __end;
2409 }
2410 if (frames > (snd_pcm_uframes_t)avail)
2411 frames = avail;
2412 appl_ptr = runtime->control->appl_ptr + frames;
2413 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2414 appl_ptr -= runtime->boundary;
2415 runtime->control->appl_ptr = appl_ptr;
2416 ret = frames;
2417 __end:
2418 snd_pcm_stream_unlock_irq(substream);
2419 return ret;
2420}
2421
2422static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2423{
2424 struct snd_pcm_runtime *runtime = substream->runtime;
2425 int err;
2426
2427 snd_pcm_stream_lock_irq(substream);
2428 switch (runtime->status->state) {
2429 case SNDRV_PCM_STATE_DRAINING:
2430 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2431 goto __badfd;
2432 /* Fall through */
2433 case SNDRV_PCM_STATE_RUNNING:
2434 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2435 break;
2436 /* Fall through */
2437 case SNDRV_PCM_STATE_PREPARED:
2438 case SNDRV_PCM_STATE_SUSPENDED:
2439 err = 0;
2440 break;
2441 case SNDRV_PCM_STATE_XRUN:
2442 err = -EPIPE;
2443 break;
2444 default:
2445 __badfd:
2446 err = -EBADFD;
2447 break;
2448 }
2449 snd_pcm_stream_unlock_irq(substream);
2450 return err;
2451}
2452
2453static int snd_pcm_delay(struct snd_pcm_substream *substream,
2454 snd_pcm_sframes_t __user *res)
2455{
2456 struct snd_pcm_runtime *runtime = substream->runtime;
2457 int err;
2458 snd_pcm_sframes_t n = 0;
2459
2460 snd_pcm_stream_lock_irq(substream);
2461 switch (runtime->status->state) {
2462 case SNDRV_PCM_STATE_DRAINING:
2463 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2464 goto __badfd;
2465 /* Fall through */
2466 case SNDRV_PCM_STATE_RUNNING:
2467 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2468 break;
2469 /* Fall through */
2470 case SNDRV_PCM_STATE_PREPARED:
2471 case SNDRV_PCM_STATE_SUSPENDED:
2472 err = 0;
2473 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2474 n = snd_pcm_playback_hw_avail(runtime);
2475 else
2476 n = snd_pcm_capture_avail(runtime);
2477 n += runtime->delay;
2478 break;
2479 case SNDRV_PCM_STATE_XRUN:
2480 err = -EPIPE;
2481 break;
2482 default:
2483 __badfd:
2484 err = -EBADFD;
2485 break;
2486 }
2487 snd_pcm_stream_unlock_irq(substream);
2488 if (!err)
2489 if (put_user(n, res))
2490 err = -EFAULT;
2491 return err;
2492}
2493
2494static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2495 struct snd_pcm_sync_ptr __user *_sync_ptr)
2496{
2497 struct snd_pcm_runtime *runtime = substream->runtime;
2498 struct snd_pcm_sync_ptr sync_ptr;
2499 volatile struct snd_pcm_mmap_status *status;
2500 volatile struct snd_pcm_mmap_control *control;
2501 int err;
2502
2503 memset(&sync_ptr, 0, sizeof(sync_ptr));
2504 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2505 return -EFAULT;
2506 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2507 return -EFAULT;
2508 status = runtime->status;
2509 control = runtime->control;
2510 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2511 err = snd_pcm_hwsync(substream);
2512 if (err < 0)
2513 return err;
2514 }
2515 snd_pcm_stream_lock_irq(substream);
2516 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2517 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2518 else
2519 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2520 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2521 control->avail_min = sync_ptr.c.control.avail_min;
2522 else
2523 sync_ptr.c.control.avail_min = control->avail_min;
2524 sync_ptr.s.status.state = status->state;
2525 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2526 sync_ptr.s.status.tstamp = status->tstamp;
2527 sync_ptr.s.status.suspended_state = status->suspended_state;
2528 snd_pcm_stream_unlock_irq(substream);
2529 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2530 return -EFAULT;
2531 return 0;
2532}
2533
2534static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2535{
2536 struct snd_pcm_runtime *runtime = substream->runtime;
2537 int arg;
2538
2539 if (get_user(arg, _arg))
2540 return -EFAULT;
2541 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2542 return -EINVAL;
2543 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2544 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2545 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2546 return 0;
2547}
2548
2549static int snd_pcm_common_ioctl1(struct file *file,
2550 struct snd_pcm_substream *substream,
2551 unsigned int cmd, void __user *arg)
2552{
2553 switch (cmd) {
2554 case SNDRV_PCM_IOCTL_PVERSION:
2555 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2556 case SNDRV_PCM_IOCTL_INFO:
2557 return snd_pcm_info_user(substream, arg);
2558 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2559 return 0;
2560 case SNDRV_PCM_IOCTL_TTSTAMP:
2561 return snd_pcm_tstamp(substream, arg);
2562 case SNDRV_PCM_IOCTL_HW_REFINE:
2563 return snd_pcm_hw_refine_user(substream, arg);
2564 case SNDRV_PCM_IOCTL_HW_PARAMS:
2565 return snd_pcm_hw_params_user(substream, arg);
2566 case SNDRV_PCM_IOCTL_HW_FREE:
2567 return snd_pcm_hw_free(substream);
2568 case SNDRV_PCM_IOCTL_SW_PARAMS:
2569 return snd_pcm_sw_params_user(substream, arg);
2570 case SNDRV_PCM_IOCTL_STATUS:
2571 return snd_pcm_status_user(substream, arg);
2572 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2573 return snd_pcm_channel_info_user(substream, arg);
2574 case SNDRV_PCM_IOCTL_PREPARE:
2575 return snd_pcm_prepare(substream, file);
2576 case SNDRV_PCM_IOCTL_RESET:
2577 return snd_pcm_reset(substream);
2578 case SNDRV_PCM_IOCTL_START:
2579 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2580 case SNDRV_PCM_IOCTL_LINK:
2581 return snd_pcm_link(substream, (int)(unsigned long) arg);
2582 case SNDRV_PCM_IOCTL_UNLINK:
2583 return snd_pcm_unlink(substream);
2584 case SNDRV_PCM_IOCTL_RESUME:
2585 return snd_pcm_resume(substream);
2586 case SNDRV_PCM_IOCTL_XRUN:
2587 return snd_pcm_xrun(substream);
2588 case SNDRV_PCM_IOCTL_HWSYNC:
2589 return snd_pcm_hwsync(substream);
2590 case SNDRV_PCM_IOCTL_DELAY:
2591 return snd_pcm_delay(substream, arg);
2592 case SNDRV_PCM_IOCTL_SYNC_PTR:
2593 return snd_pcm_sync_ptr(substream, arg);
2594#ifdef CONFIG_SND_SUPPORT_OLD_API
2595 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2596 return snd_pcm_hw_refine_old_user(substream, arg);
2597 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2598 return snd_pcm_hw_params_old_user(substream, arg);
2599#endif
2600 case SNDRV_PCM_IOCTL_DRAIN:
2601 return snd_pcm_drain(substream, file);
2602 case SNDRV_PCM_IOCTL_DROP:
2603 return snd_pcm_drop(substream);
2604 case SNDRV_PCM_IOCTL_PAUSE:
2605 {
2606 int res;
2607 snd_pcm_stream_lock_irq(substream);
2608 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2609 snd_pcm_stream_unlock_irq(substream);
2610 return res;
2611 }
2612 }
2613 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2614 return -ENOTTY;
2615}
2616
2617static int snd_pcm_playback_ioctl1(struct file *file,
2618 struct snd_pcm_substream *substream,
2619 unsigned int cmd, void __user *arg)
2620{
2621 if (snd_BUG_ON(!substream))
2622 return -ENXIO;
2623 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2624 return -EINVAL;
2625 switch (cmd) {
2626 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2627 {
2628 struct snd_xferi xferi;
2629 struct snd_xferi __user *_xferi = arg;
2630 struct snd_pcm_runtime *runtime = substream->runtime;
2631 snd_pcm_sframes_t result;
2632 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2633 return -EBADFD;
2634 if (put_user(0, &_xferi->result))
2635 return -EFAULT;
2636 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2637 return -EFAULT;
2638 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2639 __put_user(result, &_xferi->result);
2640 return result < 0 ? result : 0;
2641 }
2642 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2643 {
2644 struct snd_xfern xfern;
2645 struct snd_xfern __user *_xfern = arg;
2646 struct snd_pcm_runtime *runtime = substream->runtime;
2647 void __user **bufs;
2648 snd_pcm_sframes_t result;
2649 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2650 return -EBADFD;
2651 if (runtime->channels > 128)
2652 return -EINVAL;
2653 if (put_user(0, &_xfern->result))
2654 return -EFAULT;
2655 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2656 return -EFAULT;
2657
2658 bufs = memdup_user(xfern.bufs,
2659 sizeof(void *) * runtime->channels);
2660 if (IS_ERR(bufs))
2661 return PTR_ERR(bufs);
2662 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2663 kfree(bufs);
2664 __put_user(result, &_xfern->result);
2665 return result < 0 ? result : 0;
2666 }
2667 case SNDRV_PCM_IOCTL_REWIND:
2668 {
2669 snd_pcm_uframes_t frames;
2670 snd_pcm_uframes_t __user *_frames = arg;
2671 snd_pcm_sframes_t result;
2672 if (get_user(frames, _frames))
2673 return -EFAULT;
2674 if (put_user(0, _frames))
2675 return -EFAULT;
2676 result = snd_pcm_playback_rewind(substream, frames);
2677 __put_user(result, _frames);
2678 return result < 0 ? result : 0;
2679 }
2680 case SNDRV_PCM_IOCTL_FORWARD:
2681 {
2682 snd_pcm_uframes_t frames;
2683 snd_pcm_uframes_t __user *_frames = arg;
2684 snd_pcm_sframes_t result;
2685 if (get_user(frames, _frames))
2686 return -EFAULT;
2687 if (put_user(0, _frames))
2688 return -EFAULT;
2689 result = snd_pcm_playback_forward(substream, frames);
2690 __put_user(result, _frames);
2691 return result < 0 ? result : 0;
2692 }
2693 }
2694 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2695}
2696
2697static int snd_pcm_capture_ioctl1(struct file *file,
2698 struct snd_pcm_substream *substream,
2699 unsigned int cmd, void __user *arg)
2700{
2701 if (snd_BUG_ON(!substream))
2702 return -ENXIO;
2703 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2704 return -EINVAL;
2705 switch (cmd) {
2706 case SNDRV_PCM_IOCTL_READI_FRAMES:
2707 {
2708 struct snd_xferi xferi;
2709 struct snd_xferi __user *_xferi = arg;
2710 struct snd_pcm_runtime *runtime = substream->runtime;
2711 snd_pcm_sframes_t result;
2712 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2713 return -EBADFD;
2714 if (put_user(0, &_xferi->result))
2715 return -EFAULT;
2716 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2717 return -EFAULT;
2718 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2719 __put_user(result, &_xferi->result);
2720 return result < 0 ? result : 0;
2721 }
2722 case SNDRV_PCM_IOCTL_READN_FRAMES:
2723 {
2724 struct snd_xfern xfern;
2725 struct snd_xfern __user *_xfern = arg;
2726 struct snd_pcm_runtime *runtime = substream->runtime;
2727 void *bufs;
2728 snd_pcm_sframes_t result;
2729 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2730 return -EBADFD;
2731 if (runtime->channels > 128)
2732 return -EINVAL;
2733 if (put_user(0, &_xfern->result))
2734 return -EFAULT;
2735 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2736 return -EFAULT;
2737
2738 bufs = memdup_user(xfern.bufs,
2739 sizeof(void *) * runtime->channels);
2740 if (IS_ERR(bufs))
2741 return PTR_ERR(bufs);
2742 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2743 kfree(bufs);
2744 __put_user(result, &_xfern->result);
2745 return result < 0 ? result : 0;
2746 }
2747 case SNDRV_PCM_IOCTL_REWIND:
2748 {
2749 snd_pcm_uframes_t frames;
2750 snd_pcm_uframes_t __user *_frames = arg;
2751 snd_pcm_sframes_t result;
2752 if (get_user(frames, _frames))
2753 return -EFAULT;
2754 if (put_user(0, _frames))
2755 return -EFAULT;
2756 result = snd_pcm_capture_rewind(substream, frames);
2757 __put_user(result, _frames);
2758 return result < 0 ? result : 0;
2759 }
2760 case SNDRV_PCM_IOCTL_FORWARD:
2761 {
2762 snd_pcm_uframes_t frames;
2763 snd_pcm_uframes_t __user *_frames = arg;
2764 snd_pcm_sframes_t result;
2765 if (get_user(frames, _frames))
2766 return -EFAULT;
2767 if (put_user(0, _frames))
2768 return -EFAULT;
2769 result = snd_pcm_capture_forward(substream, frames);
2770 __put_user(result, _frames);
2771 return result < 0 ? result : 0;
2772 }
2773 }
2774 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2775}
2776
2777static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2778 unsigned long arg)
2779{
2780 struct snd_pcm_file *pcm_file;
2781
2782 pcm_file = file->private_data;
2783
2784 if (((cmd >> 8) & 0xff) != 'A')
2785 return -ENOTTY;
2786
2787 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2788 (void __user *)arg);
2789}
2790
2791static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2792 unsigned long arg)
2793{
2794 struct snd_pcm_file *pcm_file;
2795
2796 pcm_file = file->private_data;
2797
2798 if (((cmd >> 8) & 0xff) != 'A')
2799 return -ENOTTY;
2800
2801 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2802 (void __user *)arg);
2803}
2804
2805int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2806 unsigned int cmd, void *arg)
2807{
2808 mm_segment_t fs;
2809 int result;
2810
2811 fs = snd_enter_user();
2812 switch (substream->stream) {
2813 case SNDRV_PCM_STREAM_PLAYBACK:
2814 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2815 (void __user *)arg);
2816 break;
2817 case SNDRV_PCM_STREAM_CAPTURE:
2818 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2819 (void __user *)arg);
2820 break;
2821 default:
2822 result = -EINVAL;
2823 break;
2824 }
2825 snd_leave_user(fs);
2826 return result;
2827}
2828
2829EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2830
2831static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2832 loff_t * offset)
2833{
2834 struct snd_pcm_file *pcm_file;
2835 struct snd_pcm_substream *substream;
2836 struct snd_pcm_runtime *runtime;
2837 snd_pcm_sframes_t result;
2838
2839 pcm_file = file->private_data;
2840 substream = pcm_file->substream;
2841 if (PCM_RUNTIME_CHECK(substream))
2842 return -ENXIO;
2843 runtime = substream->runtime;
2844 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2845 return -EBADFD;
2846 if (!frame_aligned(runtime, count))
2847 return -EINVAL;
2848 count = bytes_to_frames(runtime, count);
2849 result = snd_pcm_lib_read(substream, buf, count);
2850 if (result > 0)
2851 result = frames_to_bytes(runtime, result);
2852 return result;
2853}
2854
2855static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2856 size_t count, loff_t * offset)
2857{
2858 struct snd_pcm_file *pcm_file;
2859 struct snd_pcm_substream *substream;
2860 struct snd_pcm_runtime *runtime;
2861 snd_pcm_sframes_t result;
2862
2863 pcm_file = file->private_data;
2864 substream = pcm_file->substream;
2865 if (PCM_RUNTIME_CHECK(substream))
2866 return -ENXIO;
2867 runtime = substream->runtime;
2868 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2869 return -EBADFD;
2870 if (!frame_aligned(runtime, count))
2871 return -EINVAL;
2872 count = bytes_to_frames(runtime, count);
2873 result = snd_pcm_lib_write(substream, buf, count);
2874 if (result > 0)
2875 result = frames_to_bytes(runtime, result);
2876 return result;
2877}
2878
2879static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2880 unsigned long nr_segs, loff_t pos)
2881
2882{
2883 struct snd_pcm_file *pcm_file;
2884 struct snd_pcm_substream *substream;
2885 struct snd_pcm_runtime *runtime;
2886 snd_pcm_sframes_t result;
2887 unsigned long i;
2888 void __user **bufs;
2889 snd_pcm_uframes_t frames;
2890
2891 pcm_file = iocb->ki_filp->private_data;
2892 substream = pcm_file->substream;
2893 if (PCM_RUNTIME_CHECK(substream))
2894 return -ENXIO;
2895 runtime = substream->runtime;
2896 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2897 return -EBADFD;
2898 if (nr_segs > 1024 || nr_segs != runtime->channels)
2899 return -EINVAL;
2900 if (!frame_aligned(runtime, iov->iov_len))
2901 return -EINVAL;
2902 frames = bytes_to_samples(runtime, iov->iov_len);
2903 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2904 if (bufs == NULL)
2905 return -ENOMEM;
2906 for (i = 0; i < nr_segs; ++i)
2907 bufs[i] = iov[i].iov_base;
2908 result = snd_pcm_lib_readv(substream, bufs, frames);
2909 if (result > 0)
2910 result = frames_to_bytes(runtime, result);
2911 kfree(bufs);
2912 return result;
2913}
2914
2915static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2916 unsigned long nr_segs, loff_t pos)
2917{
2918 struct snd_pcm_file *pcm_file;
2919 struct snd_pcm_substream *substream;
2920 struct snd_pcm_runtime *runtime;
2921 snd_pcm_sframes_t result;
2922 unsigned long i;
2923 void __user **bufs;
2924 snd_pcm_uframes_t frames;
2925
2926 pcm_file = iocb->ki_filp->private_data;
2927 substream = pcm_file->substream;
2928 if (PCM_RUNTIME_CHECK(substream))
2929 return -ENXIO;
2930 runtime = substream->runtime;
2931 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2932 return -EBADFD;
2933 if (nr_segs > 128 || nr_segs != runtime->channels ||
2934 !frame_aligned(runtime, iov->iov_len))
2935 return -EINVAL;
2936 frames = bytes_to_samples(runtime, iov->iov_len);
2937 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2938 if (bufs == NULL)
2939 return -ENOMEM;
2940 for (i = 0; i < nr_segs; ++i)
2941 bufs[i] = iov[i].iov_base;
2942 result = snd_pcm_lib_writev(substream, bufs, frames);
2943 if (result > 0)
2944 result = frames_to_bytes(runtime, result);
2945 kfree(bufs);
2946 return result;
2947}
2948
2949static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2950{
2951 struct snd_pcm_file *pcm_file;
2952 struct snd_pcm_substream *substream;
2953 struct snd_pcm_runtime *runtime;
2954 unsigned int mask;
2955 snd_pcm_uframes_t avail;
2956
2957 pcm_file = file->private_data;
2958
2959 substream = pcm_file->substream;
2960 if (PCM_RUNTIME_CHECK(substream))
2961 return -ENXIO;
2962 runtime = substream->runtime;
2963
2964 poll_wait(file, &runtime->sleep, wait);
2965
2966 snd_pcm_stream_lock_irq(substream);
2967 avail = snd_pcm_playback_avail(runtime);
2968 switch (runtime->status->state) {
2969 case SNDRV_PCM_STATE_RUNNING:
2970 case SNDRV_PCM_STATE_PREPARED:
2971 case SNDRV_PCM_STATE_PAUSED:
2972 if (avail >= runtime->control->avail_min) {
2973 mask = POLLOUT | POLLWRNORM;
2974 break;
2975 }
2976 /* Fall through */
2977 case SNDRV_PCM_STATE_DRAINING:
2978 mask = 0;
2979 break;
2980 default:
2981 mask = POLLOUT | POLLWRNORM | POLLERR;
2982 break;
2983 }
2984 snd_pcm_stream_unlock_irq(substream);
2985 return mask;
2986}
2987
2988static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2989{
2990 struct snd_pcm_file *pcm_file;
2991 struct snd_pcm_substream *substream;
2992 struct snd_pcm_runtime *runtime;
2993 unsigned int mask;
2994 snd_pcm_uframes_t avail;
2995
2996 pcm_file = file->private_data;
2997
2998 substream = pcm_file->substream;
2999 if (PCM_RUNTIME_CHECK(substream))
3000 return -ENXIO;
3001 runtime = substream->runtime;
3002
3003 poll_wait(file, &runtime->sleep, wait);
3004
3005 snd_pcm_stream_lock_irq(substream);
3006 avail = snd_pcm_capture_avail(runtime);
3007 switch (runtime->status->state) {
3008 case SNDRV_PCM_STATE_RUNNING:
3009 case SNDRV_PCM_STATE_PREPARED:
3010 case SNDRV_PCM_STATE_PAUSED:
3011 if (avail >= runtime->control->avail_min) {
3012 mask = POLLIN | POLLRDNORM;
3013 break;
3014 }
3015 mask = 0;
3016 break;
3017 case SNDRV_PCM_STATE_DRAINING:
3018 if (avail > 0) {
3019 mask = POLLIN | POLLRDNORM;
3020 break;
3021 }
3022 /* Fall through */
3023 default:
3024 mask = POLLIN | POLLRDNORM | POLLERR;
3025 break;
3026 }
3027 snd_pcm_stream_unlock_irq(substream);
3028 return mask;
3029}
3030
3031/*
3032 * mmap support
3033 */
3034
3035/*
3036 * Only on coherent architectures, we can mmap the status and the control records
3037 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3038 */
3039#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3040/*
3041 * mmap status record
3042 */
3043static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3044 struct vm_fault *vmf)
3045{
3046 struct snd_pcm_substream *substream = area->vm_private_data;
3047 struct snd_pcm_runtime *runtime;
3048
3049 if (substream == NULL)
3050 return VM_FAULT_SIGBUS;
3051 runtime = substream->runtime;
3052 vmf->page = virt_to_page(runtime->status);
3053 get_page(vmf->page);
3054 return 0;
3055}
3056
3057static const struct vm_operations_struct snd_pcm_vm_ops_status =
3058{
3059 .fault = snd_pcm_mmap_status_fault,
3060};
3061
3062static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3063 struct vm_area_struct *area)
3064{
3065 long size;
3066 if (!(area->vm_flags & VM_READ))
3067 return -EINVAL;
3068 size = area->vm_end - area->vm_start;
3069 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3070 return -EINVAL;
3071 area->vm_ops = &snd_pcm_vm_ops_status;
3072 area->vm_private_data = substream;
3073 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3074 return 0;
3075}
3076
3077/*
3078 * mmap control record
3079 */
3080static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3081 struct vm_fault *vmf)
3082{
3083 struct snd_pcm_substream *substream = area->vm_private_data;
3084 struct snd_pcm_runtime *runtime;
3085
3086 if (substream == NULL)
3087 return VM_FAULT_SIGBUS;
3088 runtime = substream->runtime;
3089 vmf->page = virt_to_page(runtime->control);
3090 get_page(vmf->page);
3091 return 0;
3092}
3093
3094static const struct vm_operations_struct snd_pcm_vm_ops_control =
3095{
3096 .fault = snd_pcm_mmap_control_fault,
3097};
3098
3099static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3100 struct vm_area_struct *area)
3101{
3102 long size;
3103 if (!(area->vm_flags & VM_READ))
3104 return -EINVAL;
3105 size = area->vm_end - area->vm_start;
3106 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3107 return -EINVAL;
3108 area->vm_ops = &snd_pcm_vm_ops_control;
3109 area->vm_private_data = substream;
3110 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3111 return 0;
3112}
3113#else /* ! coherent mmap */
3114/*
3115 * don't support mmap for status and control records.
3116 */
3117static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3118 struct vm_area_struct *area)
3119{
3120 return -ENXIO;
3121}
3122static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3123 struct vm_area_struct *area)
3124{
3125 return -ENXIO;
3126}
3127#endif /* coherent mmap */
3128
3129static inline struct page *
3130snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3131{
3132 void *vaddr = substream->runtime->dma_area + ofs;
3133#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3134 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3135 return virt_to_page(CAC_ADDR(vaddr));
3136#endif
3137#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3138 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3139 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3140 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3141 /* assume dma_handle set via pfn_to_phys() in
3142 * mm/dma-noncoherent.c
3143 */
3144 return pfn_to_page(addr >> PAGE_SHIFT);
3145 }
3146#endif
3147 return virt_to_page(vaddr);
3148}
3149
3150/*
3151 * fault callback for mmapping a RAM page
3152 */
3153static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3154 struct vm_fault *vmf)
3155{
3156 struct snd_pcm_substream *substream = area->vm_private_data;
3157 struct snd_pcm_runtime *runtime;
3158 unsigned long offset;
3159 struct page * page;
3160 size_t dma_bytes;
3161
3162 if (substream == NULL)
3163 return VM_FAULT_SIGBUS;
3164 runtime = substream->runtime;
3165 offset = vmf->pgoff << PAGE_SHIFT;
3166 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3167 if (offset > dma_bytes - PAGE_SIZE)
3168 return VM_FAULT_SIGBUS;
3169 if (substream->ops->page)
3170 page = substream->ops->page(substream, offset);
3171 else
3172 page = snd_pcm_default_page_ops(substream, offset);
3173 if (!page)
3174 return VM_FAULT_SIGBUS;
3175 get_page(page);
3176 vmf->page = page;
3177 return 0;
3178}
3179
3180static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3181 .open = snd_pcm_mmap_data_open,
3182 .close = snd_pcm_mmap_data_close,
3183};
3184
3185static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3186 .open = snd_pcm_mmap_data_open,
3187 .close = snd_pcm_mmap_data_close,
3188 .fault = snd_pcm_mmap_data_fault,
3189};
3190
3191#ifndef ARCH_HAS_DMA_MMAP_COHERENT
3192/* This should be defined / handled globally! */
3193#ifdef CONFIG_ARM
3194#define ARCH_HAS_DMA_MMAP_COHERENT
3195#endif
3196#endif
3197
3198/*
3199 * mmap the DMA buffer on RAM
3200 */
3201int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3202 struct vm_area_struct *area)
3203{
3204 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3205#ifdef CONFIG_GENERIC_ALLOCATOR
3206 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3207 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3208 return remap_pfn_range(area, area->vm_start,
3209 substream->dma_buffer.addr >> PAGE_SHIFT,
3210 area->vm_end - area->vm_start, area->vm_page_prot);
3211 }
3212#endif /* CONFIG_GENERIC_ALLOCATOR */
3213#ifdef ARCH_HAS_DMA_MMAP_COHERENT
3214 if (!substream->ops->page &&
3215 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3216 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3217 area,
3218 substream->runtime->dma_area,
3219 substream->runtime->dma_addr,
3220 area->vm_end - area->vm_start);
3221#elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3222 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3223 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3224 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3225#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3226 /* mmap with fault handler */
3227 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3228 return 0;
3229}
3230EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3231
3232/*
3233 * mmap the DMA buffer on I/O memory area
3234 */
3235#if SNDRV_PCM_INFO_MMAP_IOMEM
3236int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3237 struct vm_area_struct *area)
3238{
3239 struct snd_pcm_runtime *runtime = substream->runtime;;
3240
3241 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3242 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3243}
3244
3245EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3246#endif /* SNDRV_PCM_INFO_MMAP */
3247
3248/*
3249 * mmap DMA buffer
3250 */
3251int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3252 struct vm_area_struct *area)
3253{
3254 struct snd_pcm_runtime *runtime;
3255 long size;
3256 unsigned long offset;
3257 size_t dma_bytes;
3258 int err;
3259
3260 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3261 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3262 return -EINVAL;
3263 } else {
3264 if (!(area->vm_flags & VM_READ))
3265 return -EINVAL;
3266 }
3267 runtime = substream->runtime;
3268 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3269 return -EBADFD;
3270 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3271 return -ENXIO;
3272 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3273 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3274 return -EINVAL;
3275 size = area->vm_end - area->vm_start;
3276 offset = area->vm_pgoff << PAGE_SHIFT;
3277 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3278 if ((size_t)size > dma_bytes)
3279 return -EINVAL;
3280 if (offset > dma_bytes - size)
3281 return -EINVAL;
3282
3283 area->vm_ops = &snd_pcm_vm_ops_data;
3284 area->vm_private_data = substream;
3285 if (substream->ops->mmap)
3286 err = substream->ops->mmap(substream, area);
3287 else
3288 err = snd_pcm_lib_default_mmap(substream, area);
3289 if (!err)
3290 atomic_inc(&substream->mmap_count);
3291 return err;
3292}
3293
3294EXPORT_SYMBOL(snd_pcm_mmap_data);
3295
3296static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3297{
3298 struct snd_pcm_file * pcm_file;
3299 struct snd_pcm_substream *substream;
3300 unsigned long offset;
3301
3302 pcm_file = file->private_data;
3303 substream = pcm_file->substream;
3304 if (PCM_RUNTIME_CHECK(substream))
3305 return -ENXIO;
3306
3307 offset = area->vm_pgoff << PAGE_SHIFT;
3308 switch (offset) {
3309 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3310 if (pcm_file->no_compat_mmap)
3311 return -ENXIO;
3312 return snd_pcm_mmap_status(substream, file, area);
3313 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3314 if (pcm_file->no_compat_mmap)
3315 return -ENXIO;
3316 return snd_pcm_mmap_control(substream, file, area);
3317 default:
3318 return snd_pcm_mmap_data(substream, file, area);
3319 }
3320 return 0;
3321}
3322
3323static int snd_pcm_fasync(int fd, struct file * file, int on)
3324{
3325 struct snd_pcm_file * pcm_file;
3326 struct snd_pcm_substream *substream;
3327 struct snd_pcm_runtime *runtime;
3328
3329 pcm_file = file->private_data;
3330 substream = pcm_file->substream;
3331 if (PCM_RUNTIME_CHECK(substream))
3332 return -ENXIO;
3333 runtime = substream->runtime;
3334 return fasync_helper(fd, file, on, &runtime->fasync);
3335}
3336
3337/*
3338 * ioctl32 compat
3339 */
3340#ifdef CONFIG_COMPAT
3341#include "pcm_compat.c"
3342#else
3343#define snd_pcm_ioctl_compat NULL
3344#endif
3345
3346/*
3347 * To be removed helpers to keep binary compatibility
3348 */
3349
3350#ifdef CONFIG_SND_SUPPORT_OLD_API
3351#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3352#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3353
3354static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3355 struct snd_pcm_hw_params_old *oparams)
3356{
3357 unsigned int i;
3358
3359 memset(params, 0, sizeof(*params));
3360 params->flags = oparams->flags;
3361 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3362 params->masks[i].bits[0] = oparams->masks[i];
3363 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3364 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3365 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3366 params->info = oparams->info;
3367 params->msbits = oparams->msbits;
3368 params->rate_num = oparams->rate_num;
3369 params->rate_den = oparams->rate_den;
3370 params->fifo_size = oparams->fifo_size;
3371}
3372
3373static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3374 struct snd_pcm_hw_params *params)
3375{
3376 unsigned int i;
3377
3378 memset(oparams, 0, sizeof(*oparams));
3379 oparams->flags = params->flags;
3380 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3381 oparams->masks[i] = params->masks[i].bits[0];
3382 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3383 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3384 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3385 oparams->info = params->info;
3386 oparams->msbits = params->msbits;
3387 oparams->rate_num = params->rate_num;
3388 oparams->rate_den = params->rate_den;
3389 oparams->fifo_size = params->fifo_size;
3390}
3391
3392static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3393 struct snd_pcm_hw_params_old __user * _oparams)
3394{
3395 struct snd_pcm_hw_params *params;
3396 struct snd_pcm_hw_params_old *oparams = NULL;
3397 int err;
3398
3399 params = kmalloc(sizeof(*params), GFP_KERNEL);
3400 if (!params)
3401 return -ENOMEM;
3402
3403 oparams = memdup_user(_oparams, sizeof(*oparams));
3404 if (IS_ERR(oparams)) {
3405 err = PTR_ERR(oparams);
3406 goto out;
3407 }
3408 snd_pcm_hw_convert_from_old_params(params, oparams);
3409 err = snd_pcm_hw_refine(substream, params);
3410 snd_pcm_hw_convert_to_old_params(oparams, params);
3411 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3412 if (!err)
3413 err = -EFAULT;
3414 }
3415
3416 kfree(oparams);
3417out:
3418 kfree(params);
3419 return err;
3420}
3421
3422static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3423 struct snd_pcm_hw_params_old __user * _oparams)
3424{
3425 struct snd_pcm_hw_params *params;
3426 struct snd_pcm_hw_params_old *oparams = NULL;
3427 int err;
3428
3429 params = kmalloc(sizeof(*params), GFP_KERNEL);
3430 if (!params)
3431 return -ENOMEM;
3432
3433 oparams = memdup_user(_oparams, sizeof(*oparams));
3434 if (IS_ERR(oparams)) {
3435 err = PTR_ERR(oparams);
3436 goto out;
3437 }
3438 snd_pcm_hw_convert_from_old_params(params, oparams);
3439 err = snd_pcm_hw_params(substream, params);
3440 snd_pcm_hw_convert_to_old_params(oparams, params);
3441 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3442 if (!err)
3443 err = -EFAULT;
3444 }
3445
3446 kfree(oparams);
3447out:
3448 kfree(params);
3449 return err;
3450}
3451#endif /* CONFIG_SND_SUPPORT_OLD_API */
3452
3453#ifndef CONFIG_MMU
3454static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3455 unsigned long addr,
3456 unsigned long len,
3457 unsigned long pgoff,
3458 unsigned long flags)
3459{
3460 struct snd_pcm_file *pcm_file = file->private_data;
3461 struct snd_pcm_substream *substream = pcm_file->substream;
3462 struct snd_pcm_runtime *runtime = substream->runtime;
3463 unsigned long offset = pgoff << PAGE_SHIFT;
3464
3465 switch (offset) {
3466 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3467 return (unsigned long)runtime->status;
3468 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3469 return (unsigned long)runtime->control;
3470 default:
3471 return (unsigned long)runtime->dma_area + offset;
3472 }
3473}
3474#else
3475# define snd_pcm_get_unmapped_area NULL
3476#endif
3477
3478/*
3479 * Register section
3480 */
3481
3482const struct file_operations snd_pcm_f_ops[2] = {
3483 {
3484 .owner = THIS_MODULE,
3485 .write = snd_pcm_write,
3486 .aio_write = snd_pcm_aio_write,
3487 .open = snd_pcm_playback_open,
3488 .release = snd_pcm_release,
3489 .llseek = no_llseek,
3490 .poll = snd_pcm_playback_poll,
3491 .unlocked_ioctl = snd_pcm_playback_ioctl,
3492 .compat_ioctl = snd_pcm_ioctl_compat,
3493 .mmap = snd_pcm_mmap,
3494 .fasync = snd_pcm_fasync,
3495 .get_unmapped_area = snd_pcm_get_unmapped_area,
3496 },
3497 {
3498 .owner = THIS_MODULE,
3499 .read = snd_pcm_read,
3500 .aio_read = snd_pcm_aio_read,
3501 .open = snd_pcm_capture_open,
3502 .release = snd_pcm_release,
3503 .llseek = no_llseek,
3504 .poll = snd_pcm_capture_poll,
3505 .unlocked_ioctl = snd_pcm_capture_ioctl,
3506 .compat_ioctl = snd_pcm_ioctl_compat,
3507 .mmap = snd_pcm_mmap,
3508 .fasync = snd_pcm_fasync,
3509 .get_unmapped_area = snd_pcm_get_unmapped_area,
3510 }
3511};
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/sched/signal.h>
27#include <linux/time.h>
28#include <linux/pm_qos.h>
29#include <linux/io.h>
30#include <linux/dma-mapping.h>
31#include <sound/core.h>
32#include <sound/control.h>
33#include <sound/info.h>
34#include <sound/pcm.h>
35#include <sound/pcm_params.h>
36#include <sound/timer.h>
37#include <sound/minors.h>
38#include <linux/uio.h>
39
40#include "pcm_local.h"
41
42#ifdef CONFIG_SND_DEBUG
43#define CREATE_TRACE_POINTS
44#include "pcm_param_trace.h"
45#else
46#define trace_hw_mask_param_enabled() 0
47#define trace_hw_interval_param_enabled() 0
48#define trace_hw_mask_param(substream, type, index, prev, curr)
49#define trace_hw_interval_param(substream, type, index, prev, curr)
50#endif
51
52/*
53 * Compatibility
54 */
55
56struct snd_pcm_hw_params_old {
57 unsigned int flags;
58 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
59 SNDRV_PCM_HW_PARAM_ACCESS + 1];
60 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
61 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
62 unsigned int rmask;
63 unsigned int cmask;
64 unsigned int info;
65 unsigned int msbits;
66 unsigned int rate_num;
67 unsigned int rate_den;
68 snd_pcm_uframes_t fifo_size;
69 unsigned char reserved[64];
70};
71
72#ifdef CONFIG_SND_SUPPORT_OLD_API
73#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
74#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
75
76static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
77 struct snd_pcm_hw_params_old __user * _oparams);
78static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
79 struct snd_pcm_hw_params_old __user * _oparams);
80#endif
81static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
82
83/*
84 *
85 */
86
87static DEFINE_RWLOCK(snd_pcm_link_rwlock);
88static DECLARE_RWSEM(snd_pcm_link_rwsem);
89
90/* Writer in rwsem may block readers even during its waiting in queue,
91 * and this may lead to a deadlock when the code path takes read sem
92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to
94 * spin until it gets the lock.
95 */
96static inline void down_write_nonblock(struct rw_semaphore *lock)
97{
98 while (!down_write_trylock(lock))
99 cond_resched();
100}
101
102/**
103 * snd_pcm_stream_lock - Lock the PCM stream
104 * @substream: PCM substream
105 *
106 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
107 * flag of the given substream. This also takes the global link rw lock
108 * (or rw sem), too, for avoiding the race with linked streams.
109 */
110void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
111{
112 if (substream->pcm->nonatomic) {
113 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
114 mutex_lock(&substream->self_group.mutex);
115 } else {
116 read_lock(&snd_pcm_link_rwlock);
117 spin_lock(&substream->self_group.lock);
118 }
119}
120EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
121
122/**
123 * snd_pcm_stream_lock - Unlock the PCM stream
124 * @substream: PCM substream
125 *
126 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
127 */
128void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
129{
130 if (substream->pcm->nonatomic) {
131 mutex_unlock(&substream->self_group.mutex);
132 up_read(&snd_pcm_link_rwsem);
133 } else {
134 spin_unlock(&substream->self_group.lock);
135 read_unlock(&snd_pcm_link_rwlock);
136 }
137}
138EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
139
140/**
141 * snd_pcm_stream_lock_irq - Lock the PCM stream
142 * @substream: PCM substream
143 *
144 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
145 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
146 * as snd_pcm_stream_lock().
147 */
148void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
149{
150 if (!substream->pcm->nonatomic)
151 local_irq_disable();
152 snd_pcm_stream_lock(substream);
153}
154EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
155
156/**
157 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
158 * @substream: PCM substream
159 *
160 * This is a counter-part of snd_pcm_stream_lock_irq().
161 */
162void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
163{
164 snd_pcm_stream_unlock(substream);
165 if (!substream->pcm->nonatomic)
166 local_irq_enable();
167}
168EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
169
170unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
171{
172 unsigned long flags = 0;
173 if (!substream->pcm->nonatomic)
174 local_irq_save(flags);
175 snd_pcm_stream_lock(substream);
176 return flags;
177}
178EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
179
180/**
181 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
182 * @substream: PCM substream
183 * @flags: irq flags
184 *
185 * This is a counter-part of snd_pcm_stream_lock_irqsave().
186 */
187void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
188 unsigned long flags)
189{
190 snd_pcm_stream_unlock(substream);
191 if (!substream->pcm->nonatomic)
192 local_irq_restore(flags);
193}
194EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
195
196int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
197{
198 struct snd_pcm *pcm = substream->pcm;
199 struct snd_pcm_str *pstr = substream->pstr;
200
201 memset(info, 0, sizeof(*info));
202 info->card = pcm->card->number;
203 info->device = pcm->device;
204 info->stream = substream->stream;
205 info->subdevice = substream->number;
206 strlcpy(info->id, pcm->id, sizeof(info->id));
207 strlcpy(info->name, pcm->name, sizeof(info->name));
208 info->dev_class = pcm->dev_class;
209 info->dev_subclass = pcm->dev_subclass;
210 info->subdevices_count = pstr->substream_count;
211 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
212 strlcpy(info->subname, substream->name, sizeof(info->subname));
213
214 return 0;
215}
216
217int snd_pcm_info_user(struct snd_pcm_substream *substream,
218 struct snd_pcm_info __user * _info)
219{
220 struct snd_pcm_info *info;
221 int err;
222
223 info = kmalloc(sizeof(*info), GFP_KERNEL);
224 if (! info)
225 return -ENOMEM;
226 err = snd_pcm_info(substream, info);
227 if (err >= 0) {
228 if (copy_to_user(_info, info, sizeof(*info)))
229 err = -EFAULT;
230 }
231 kfree(info);
232 return err;
233}
234
235static bool hw_support_mmap(struct snd_pcm_substream *substream)
236{
237 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
238 return false;
239 /* architecture supports dma_mmap_coherent()? */
240#if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA)
241 if (!substream->ops->mmap &&
242 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
243 return false;
244#endif
245 return true;
246}
247
248static int constrain_mask_params(struct snd_pcm_substream *substream,
249 struct snd_pcm_hw_params *params)
250{
251 struct snd_pcm_hw_constraints *constrs =
252 &substream->runtime->hw_constraints;
253 struct snd_mask *m;
254 unsigned int k;
255 struct snd_mask old_mask;
256 int changed;
257
258 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
259 m = hw_param_mask(params, k);
260 if (snd_mask_empty(m))
261 return -EINVAL;
262
263 /* This parameter is not requested to change by a caller. */
264 if (!(params->rmask & (1 << k)))
265 continue;
266
267 if (trace_hw_mask_param_enabled())
268 old_mask = *m;
269
270 changed = snd_mask_refine(m, constrs_mask(constrs, k));
271 if (changed < 0)
272 return changed;
273 if (changed == 0)
274 continue;
275
276 /* Set corresponding flag so that the caller gets it. */
277 trace_hw_mask_param(substream, k, 0, &old_mask, m);
278 params->cmask |= 1 << k;
279 }
280
281 return 0;
282}
283
284static int constrain_interval_params(struct snd_pcm_substream *substream,
285 struct snd_pcm_hw_params *params)
286{
287 struct snd_pcm_hw_constraints *constrs =
288 &substream->runtime->hw_constraints;
289 struct snd_interval *i;
290 unsigned int k;
291 struct snd_interval old_interval;
292 int changed;
293
294 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
295 i = hw_param_interval(params, k);
296 if (snd_interval_empty(i))
297 return -EINVAL;
298
299 /* This parameter is not requested to change by a caller. */
300 if (!(params->rmask & (1 << k)))
301 continue;
302
303 if (trace_hw_interval_param_enabled())
304 old_interval = *i;
305
306 changed = snd_interval_refine(i, constrs_interval(constrs, k));
307 if (changed < 0)
308 return changed;
309 if (changed == 0)
310 continue;
311
312 /* Set corresponding flag so that the caller gets it. */
313 trace_hw_interval_param(substream, k, 0, &old_interval, i);
314 params->cmask |= 1 << k;
315 }
316
317 return 0;
318}
319
320static int constrain_params_by_rules(struct snd_pcm_substream *substream,
321 struct snd_pcm_hw_params *params)
322{
323 struct snd_pcm_hw_constraints *constrs =
324 &substream->runtime->hw_constraints;
325 unsigned int k;
326 unsigned int *rstamps;
327 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
328 unsigned int stamp;
329 struct snd_pcm_hw_rule *r;
330 unsigned int d;
331 struct snd_mask old_mask;
332 struct snd_interval old_interval;
333 bool again;
334 int changed, err = 0;
335
336 /*
337 * Each application of rule has own sequence number.
338 *
339 * Each member of 'rstamps' array represents the sequence number of
340 * recent application of corresponding rule.
341 */
342 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
343 if (!rstamps)
344 return -ENOMEM;
345
346 /*
347 * Each member of 'vstamps' array represents the sequence number of
348 * recent application of rule in which corresponding parameters were
349 * changed.
350 *
351 * In initial state, elements corresponding to parameters requested by
352 * a caller is 1. For unrequested parameters, corresponding members
353 * have 0 so that the parameters are never changed anymore.
354 */
355 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
356 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
357
358 /* Due to the above design, actual sequence number starts at 2. */
359 stamp = 2;
360retry:
361 /* Apply all rules in order. */
362 again = false;
363 for (k = 0; k < constrs->rules_num; k++) {
364 r = &constrs->rules[k];
365
366 /*
367 * Check condition bits of this rule. When the rule has
368 * some condition bits, parameter without the bits is
369 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
370 * is an example of the condition bits.
371 */
372 if (r->cond && !(r->cond & params->flags))
373 continue;
374
375 /*
376 * The 'deps' array includes maximum three dependencies
377 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
378 * member of this array is a sentinel and should be
379 * negative value.
380 *
381 * This rule should be processed in this time when dependent
382 * parameters were changed at former applications of the other
383 * rules.
384 */
385 for (d = 0; r->deps[d] >= 0; d++) {
386 if (vstamps[r->deps[d]] > rstamps[k])
387 break;
388 }
389 if (r->deps[d] < 0)
390 continue;
391
392 if (trace_hw_mask_param_enabled()) {
393 if (hw_is_mask(r->var))
394 old_mask = *hw_param_mask(params, r->var);
395 }
396 if (trace_hw_interval_param_enabled()) {
397 if (hw_is_interval(r->var))
398 old_interval = *hw_param_interval(params, r->var);
399 }
400
401 changed = r->func(params, r);
402 if (changed < 0) {
403 err = changed;
404 goto out;
405 }
406
407 /*
408 * When the parameter is changed, notify it to the caller
409 * by corresponding returned bit, then preparing for next
410 * iteration.
411 */
412 if (changed && r->var >= 0) {
413 if (hw_is_mask(r->var)) {
414 trace_hw_mask_param(substream, r->var,
415 k + 1, &old_mask,
416 hw_param_mask(params, r->var));
417 }
418 if (hw_is_interval(r->var)) {
419 trace_hw_interval_param(substream, r->var,
420 k + 1, &old_interval,
421 hw_param_interval(params, r->var));
422 }
423
424 params->cmask |= (1 << r->var);
425 vstamps[r->var] = stamp;
426 again = true;
427 }
428
429 rstamps[k] = stamp++;
430 }
431
432 /* Iterate to evaluate all rules till no parameters are changed. */
433 if (again)
434 goto retry;
435
436 out:
437 kfree(rstamps);
438 return err;
439}
440
441static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
442 struct snd_pcm_hw_params *params)
443{
444 const struct snd_interval *i;
445 const struct snd_mask *m;
446 int err;
447
448 if (!params->msbits) {
449 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
450 if (snd_interval_single(i))
451 params->msbits = snd_interval_value(i);
452 }
453
454 if (!params->rate_den) {
455 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
456 if (snd_interval_single(i)) {
457 params->rate_num = snd_interval_value(i);
458 params->rate_den = 1;
459 }
460 }
461
462 if (!params->fifo_size) {
463 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
464 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
465 if (snd_mask_single(m) && snd_interval_single(i)) {
466 err = substream->ops->ioctl(substream,
467 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
468 if (err < 0)
469 return err;
470 }
471 }
472
473 if (!params->info) {
474 params->info = substream->runtime->hw.info;
475 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
476 SNDRV_PCM_INFO_DRAIN_TRIGGER);
477 if (!hw_support_mmap(substream))
478 params->info &= ~(SNDRV_PCM_INFO_MMAP |
479 SNDRV_PCM_INFO_MMAP_VALID);
480 }
481
482 return 0;
483}
484
485int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
486 struct snd_pcm_hw_params *params)
487{
488 int err;
489
490 params->info = 0;
491 params->fifo_size = 0;
492 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
493 params->msbits = 0;
494 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
495 params->rate_num = 0;
496 params->rate_den = 0;
497 }
498
499 err = constrain_mask_params(substream, params);
500 if (err < 0)
501 return err;
502
503 err = constrain_interval_params(substream, params);
504 if (err < 0)
505 return err;
506
507 err = constrain_params_by_rules(substream, params);
508 if (err < 0)
509 return err;
510
511 params->rmask = 0;
512
513 return 0;
514}
515EXPORT_SYMBOL(snd_pcm_hw_refine);
516
517static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
518 struct snd_pcm_hw_params __user * _params)
519{
520 struct snd_pcm_hw_params *params;
521 int err;
522
523 params = memdup_user(_params, sizeof(*params));
524 if (IS_ERR(params))
525 return PTR_ERR(params);
526
527 err = snd_pcm_hw_refine(substream, params);
528 if (err < 0)
529 goto end;
530
531 err = fixup_unreferenced_params(substream, params);
532 if (err < 0)
533 goto end;
534
535 if (copy_to_user(_params, params, sizeof(*params)))
536 err = -EFAULT;
537end:
538 kfree(params);
539 return err;
540}
541
542static int period_to_usecs(struct snd_pcm_runtime *runtime)
543{
544 int usecs;
545
546 if (! runtime->rate)
547 return -1; /* invalid */
548
549 /* take 75% of period time as the deadline */
550 usecs = (750000 / runtime->rate) * runtime->period_size;
551 usecs += ((750000 % runtime->rate) * runtime->period_size) /
552 runtime->rate;
553
554 return usecs;
555}
556
557static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
558{
559 snd_pcm_stream_lock_irq(substream);
560 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
561 substream->runtime->status->state = state;
562 snd_pcm_stream_unlock_irq(substream);
563}
564
565static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
566 int event)
567{
568#ifdef CONFIG_SND_PCM_TIMER
569 if (substream->timer)
570 snd_timer_notify(substream->timer, event,
571 &substream->runtime->trigger_tstamp);
572#endif
573}
574
575/**
576 * snd_pcm_hw_param_choose - choose a configuration defined by @params
577 * @pcm: PCM instance
578 * @params: the hw_params instance
579 *
580 * Choose one configuration from configuration space defined by @params.
581 * The configuration chosen is that obtained fixing in this order:
582 * first access, first format, first subformat, min channels,
583 * min rate, min period time, max buffer size, min tick time
584 *
585 * Return: Zero if successful, or a negative error code on failure.
586 */
587static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
588 struct snd_pcm_hw_params *params)
589{
590 static const int vars[] = {
591 SNDRV_PCM_HW_PARAM_ACCESS,
592 SNDRV_PCM_HW_PARAM_FORMAT,
593 SNDRV_PCM_HW_PARAM_SUBFORMAT,
594 SNDRV_PCM_HW_PARAM_CHANNELS,
595 SNDRV_PCM_HW_PARAM_RATE,
596 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
597 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
598 SNDRV_PCM_HW_PARAM_TICK_TIME,
599 -1
600 };
601 const int *v;
602 struct snd_mask old_mask;
603 struct snd_interval old_interval;
604 int changed;
605
606 for (v = vars; *v != -1; v++) {
607 /* Keep old parameter to trace. */
608 if (trace_hw_mask_param_enabled()) {
609 if (hw_is_mask(*v))
610 old_mask = *hw_param_mask(params, *v);
611 }
612 if (trace_hw_interval_param_enabled()) {
613 if (hw_is_interval(*v))
614 old_interval = *hw_param_interval(params, *v);
615 }
616 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
617 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
618 else
619 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
620 if (changed < 0)
621 return changed;
622 if (changed == 0)
623 continue;
624
625 /* Trace the changed parameter. */
626 if (hw_is_mask(*v)) {
627 trace_hw_mask_param(pcm, *v, 0, &old_mask,
628 hw_param_mask(params, *v));
629 }
630 if (hw_is_interval(*v)) {
631 trace_hw_interval_param(pcm, *v, 0, &old_interval,
632 hw_param_interval(params, *v));
633 }
634 }
635
636 return 0;
637}
638
639static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
640 struct snd_pcm_hw_params *params)
641{
642 struct snd_pcm_runtime *runtime;
643 int err, usecs;
644 unsigned int bits;
645 snd_pcm_uframes_t frames;
646
647 if (PCM_RUNTIME_CHECK(substream))
648 return -ENXIO;
649 runtime = substream->runtime;
650 snd_pcm_stream_lock_irq(substream);
651 switch (runtime->status->state) {
652 case SNDRV_PCM_STATE_OPEN:
653 case SNDRV_PCM_STATE_SETUP:
654 case SNDRV_PCM_STATE_PREPARED:
655 break;
656 default:
657 snd_pcm_stream_unlock_irq(substream);
658 return -EBADFD;
659 }
660 snd_pcm_stream_unlock_irq(substream);
661#if IS_ENABLED(CONFIG_SND_PCM_OSS)
662 if (!substream->oss.oss)
663#endif
664 if (atomic_read(&substream->mmap_count))
665 return -EBADFD;
666
667 params->rmask = ~0U;
668 err = snd_pcm_hw_refine(substream, params);
669 if (err < 0)
670 goto _error;
671
672 err = snd_pcm_hw_params_choose(substream, params);
673 if (err < 0)
674 goto _error;
675
676 err = fixup_unreferenced_params(substream, params);
677 if (err < 0)
678 goto _error;
679
680 if (substream->ops->hw_params != NULL) {
681 err = substream->ops->hw_params(substream, params);
682 if (err < 0)
683 goto _error;
684 }
685
686 runtime->access = params_access(params);
687 runtime->format = params_format(params);
688 runtime->subformat = params_subformat(params);
689 runtime->channels = params_channels(params);
690 runtime->rate = params_rate(params);
691 runtime->period_size = params_period_size(params);
692 runtime->periods = params_periods(params);
693 runtime->buffer_size = params_buffer_size(params);
694 runtime->info = params->info;
695 runtime->rate_num = params->rate_num;
696 runtime->rate_den = params->rate_den;
697 runtime->no_period_wakeup =
698 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
699 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
700
701 bits = snd_pcm_format_physical_width(runtime->format);
702 runtime->sample_bits = bits;
703 bits *= runtime->channels;
704 runtime->frame_bits = bits;
705 frames = 1;
706 while (bits % 8 != 0) {
707 bits *= 2;
708 frames *= 2;
709 }
710 runtime->byte_align = bits / 8;
711 runtime->min_align = frames;
712
713 /* Default sw params */
714 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
715 runtime->period_step = 1;
716 runtime->control->avail_min = runtime->period_size;
717 runtime->start_threshold = 1;
718 runtime->stop_threshold = runtime->buffer_size;
719 runtime->silence_threshold = 0;
720 runtime->silence_size = 0;
721 runtime->boundary = runtime->buffer_size;
722 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
723 runtime->boundary *= 2;
724
725 snd_pcm_timer_resolution_change(substream);
726 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
727
728 if (pm_qos_request_active(&substream->latency_pm_qos_req))
729 pm_qos_remove_request(&substream->latency_pm_qos_req);
730 if ((usecs = period_to_usecs(runtime)) >= 0)
731 pm_qos_add_request(&substream->latency_pm_qos_req,
732 PM_QOS_CPU_DMA_LATENCY, usecs);
733 return 0;
734 _error:
735 /* hardware might be unusable from this time,
736 so we force application to retry to set
737 the correct hardware parameter settings */
738 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
739 if (substream->ops->hw_free != NULL)
740 substream->ops->hw_free(substream);
741 return err;
742}
743
744static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
745 struct snd_pcm_hw_params __user * _params)
746{
747 struct snd_pcm_hw_params *params;
748 int err;
749
750 params = memdup_user(_params, sizeof(*params));
751 if (IS_ERR(params))
752 return PTR_ERR(params);
753
754 err = snd_pcm_hw_params(substream, params);
755 if (err < 0)
756 goto end;
757
758 if (copy_to_user(_params, params, sizeof(*params)))
759 err = -EFAULT;
760end:
761 kfree(params);
762 return err;
763}
764
765static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
766{
767 struct snd_pcm_runtime *runtime;
768 int result = 0;
769
770 if (PCM_RUNTIME_CHECK(substream))
771 return -ENXIO;
772 runtime = substream->runtime;
773 snd_pcm_stream_lock_irq(substream);
774 switch (runtime->status->state) {
775 case SNDRV_PCM_STATE_SETUP:
776 case SNDRV_PCM_STATE_PREPARED:
777 break;
778 default:
779 snd_pcm_stream_unlock_irq(substream);
780 return -EBADFD;
781 }
782 snd_pcm_stream_unlock_irq(substream);
783 if (atomic_read(&substream->mmap_count))
784 return -EBADFD;
785 if (substream->ops->hw_free)
786 result = substream->ops->hw_free(substream);
787 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
788 pm_qos_remove_request(&substream->latency_pm_qos_req);
789 return result;
790}
791
792static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
793 struct snd_pcm_sw_params *params)
794{
795 struct snd_pcm_runtime *runtime;
796 int err;
797
798 if (PCM_RUNTIME_CHECK(substream))
799 return -ENXIO;
800 runtime = substream->runtime;
801 snd_pcm_stream_lock_irq(substream);
802 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
803 snd_pcm_stream_unlock_irq(substream);
804 return -EBADFD;
805 }
806 snd_pcm_stream_unlock_irq(substream);
807
808 if (params->tstamp_mode < 0 ||
809 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
810 return -EINVAL;
811 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
812 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
813 return -EINVAL;
814 if (params->avail_min == 0)
815 return -EINVAL;
816 if (params->silence_size >= runtime->boundary) {
817 if (params->silence_threshold != 0)
818 return -EINVAL;
819 } else {
820 if (params->silence_size > params->silence_threshold)
821 return -EINVAL;
822 if (params->silence_threshold > runtime->buffer_size)
823 return -EINVAL;
824 }
825 err = 0;
826 snd_pcm_stream_lock_irq(substream);
827 runtime->tstamp_mode = params->tstamp_mode;
828 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
829 runtime->tstamp_type = params->tstamp_type;
830 runtime->period_step = params->period_step;
831 runtime->control->avail_min = params->avail_min;
832 runtime->start_threshold = params->start_threshold;
833 runtime->stop_threshold = params->stop_threshold;
834 runtime->silence_threshold = params->silence_threshold;
835 runtime->silence_size = params->silence_size;
836 params->boundary = runtime->boundary;
837 if (snd_pcm_running(substream)) {
838 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
839 runtime->silence_size > 0)
840 snd_pcm_playback_silence(substream, ULONG_MAX);
841 err = snd_pcm_update_state(substream, runtime);
842 }
843 snd_pcm_stream_unlock_irq(substream);
844 return err;
845}
846
847static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
848 struct snd_pcm_sw_params __user * _params)
849{
850 struct snd_pcm_sw_params params;
851 int err;
852 if (copy_from_user(¶ms, _params, sizeof(params)))
853 return -EFAULT;
854 err = snd_pcm_sw_params(substream, ¶ms);
855 if (copy_to_user(_params, ¶ms, sizeof(params)))
856 return -EFAULT;
857 return err;
858}
859
860int snd_pcm_status(struct snd_pcm_substream *substream,
861 struct snd_pcm_status *status)
862{
863 struct snd_pcm_runtime *runtime = substream->runtime;
864
865 snd_pcm_stream_lock_irq(substream);
866
867 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
868 &runtime->audio_tstamp_config);
869
870 /* backwards compatible behavior */
871 if (runtime->audio_tstamp_config.type_requested ==
872 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
873 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
874 runtime->audio_tstamp_config.type_requested =
875 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
876 else
877 runtime->audio_tstamp_config.type_requested =
878 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
879 runtime->audio_tstamp_report.valid = 0;
880 } else
881 runtime->audio_tstamp_report.valid = 1;
882
883 status->state = runtime->status->state;
884 status->suspended_state = runtime->status->suspended_state;
885 if (status->state == SNDRV_PCM_STATE_OPEN)
886 goto _end;
887 status->trigger_tstamp = runtime->trigger_tstamp;
888 if (snd_pcm_running(substream)) {
889 snd_pcm_update_hw_ptr(substream);
890 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
891 status->tstamp = runtime->status->tstamp;
892 status->driver_tstamp = runtime->driver_tstamp;
893 status->audio_tstamp =
894 runtime->status->audio_tstamp;
895 if (runtime->audio_tstamp_report.valid == 1)
896 /* backwards compatibility, no report provided in COMPAT mode */
897 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
898 &status->audio_tstamp_accuracy,
899 &runtime->audio_tstamp_report);
900
901 goto _tstamp_end;
902 }
903 } else {
904 /* get tstamp only in fallback mode and only if enabled */
905 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
906 snd_pcm_gettime(runtime, &status->tstamp);
907 }
908 _tstamp_end:
909 status->appl_ptr = runtime->control->appl_ptr;
910 status->hw_ptr = runtime->status->hw_ptr;
911 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
912 status->avail = snd_pcm_playback_avail(runtime);
913 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
914 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
915 status->delay = runtime->buffer_size - status->avail;
916 status->delay += runtime->delay;
917 } else
918 status->delay = 0;
919 } else {
920 status->avail = snd_pcm_capture_avail(runtime);
921 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
922 status->delay = status->avail + runtime->delay;
923 else
924 status->delay = 0;
925 }
926 status->avail_max = runtime->avail_max;
927 status->overrange = runtime->overrange;
928 runtime->avail_max = 0;
929 runtime->overrange = 0;
930 _end:
931 snd_pcm_stream_unlock_irq(substream);
932 return 0;
933}
934
935static int snd_pcm_status_user(struct snd_pcm_substream *substream,
936 struct snd_pcm_status __user * _status,
937 bool ext)
938{
939 struct snd_pcm_status status;
940 int res;
941
942 memset(&status, 0, sizeof(status));
943 /*
944 * with extension, parameters are read/write,
945 * get audio_tstamp_data from user,
946 * ignore rest of status structure
947 */
948 if (ext && get_user(status.audio_tstamp_data,
949 (u32 __user *)(&_status->audio_tstamp_data)))
950 return -EFAULT;
951 res = snd_pcm_status(substream, &status);
952 if (res < 0)
953 return res;
954 if (copy_to_user(_status, &status, sizeof(status)))
955 return -EFAULT;
956 return 0;
957}
958
959static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
960 struct snd_pcm_channel_info * info)
961{
962 struct snd_pcm_runtime *runtime;
963 unsigned int channel;
964
965 channel = info->channel;
966 runtime = substream->runtime;
967 snd_pcm_stream_lock_irq(substream);
968 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
969 snd_pcm_stream_unlock_irq(substream);
970 return -EBADFD;
971 }
972 snd_pcm_stream_unlock_irq(substream);
973 if (channel >= runtime->channels)
974 return -EINVAL;
975 memset(info, 0, sizeof(*info));
976 info->channel = channel;
977 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
978}
979
980static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
981 struct snd_pcm_channel_info __user * _info)
982{
983 struct snd_pcm_channel_info info;
984 int res;
985
986 if (copy_from_user(&info, _info, sizeof(info)))
987 return -EFAULT;
988 res = snd_pcm_channel_info(substream, &info);
989 if (res < 0)
990 return res;
991 if (copy_to_user(_info, &info, sizeof(info)))
992 return -EFAULT;
993 return 0;
994}
995
996static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
997{
998 struct snd_pcm_runtime *runtime = substream->runtime;
999 if (runtime->trigger_master == NULL)
1000 return;
1001 if (runtime->trigger_master == substream) {
1002 if (!runtime->trigger_tstamp_latched)
1003 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1004 } else {
1005 snd_pcm_trigger_tstamp(runtime->trigger_master);
1006 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1007 }
1008 runtime->trigger_master = NULL;
1009}
1010
1011struct action_ops {
1012 int (*pre_action)(struct snd_pcm_substream *substream, int state);
1013 int (*do_action)(struct snd_pcm_substream *substream, int state);
1014 void (*undo_action)(struct snd_pcm_substream *substream, int state);
1015 void (*post_action)(struct snd_pcm_substream *substream, int state);
1016};
1017
1018/*
1019 * this functions is core for handling of linked stream
1020 * Note: the stream state might be changed also on failure
1021 * Note2: call with calling stream lock + link lock
1022 */
1023static int snd_pcm_action_group(const struct action_ops *ops,
1024 struct snd_pcm_substream *substream,
1025 int state, int do_lock)
1026{
1027 struct snd_pcm_substream *s = NULL;
1028 struct snd_pcm_substream *s1;
1029 int res = 0, depth = 1;
1030
1031 snd_pcm_group_for_each_entry(s, substream) {
1032 if (do_lock && s != substream) {
1033 if (s->pcm->nonatomic)
1034 mutex_lock_nested(&s->self_group.mutex, depth);
1035 else
1036 spin_lock_nested(&s->self_group.lock, depth);
1037 depth++;
1038 }
1039 res = ops->pre_action(s, state);
1040 if (res < 0)
1041 goto _unlock;
1042 }
1043 snd_pcm_group_for_each_entry(s, substream) {
1044 res = ops->do_action(s, state);
1045 if (res < 0) {
1046 if (ops->undo_action) {
1047 snd_pcm_group_for_each_entry(s1, substream) {
1048 if (s1 == s) /* failed stream */
1049 break;
1050 ops->undo_action(s1, state);
1051 }
1052 }
1053 s = NULL; /* unlock all */
1054 goto _unlock;
1055 }
1056 }
1057 snd_pcm_group_for_each_entry(s, substream) {
1058 ops->post_action(s, state);
1059 }
1060 _unlock:
1061 if (do_lock) {
1062 /* unlock streams */
1063 snd_pcm_group_for_each_entry(s1, substream) {
1064 if (s1 != substream) {
1065 if (s1->pcm->nonatomic)
1066 mutex_unlock(&s1->self_group.mutex);
1067 else
1068 spin_unlock(&s1->self_group.lock);
1069 }
1070 if (s1 == s) /* end */
1071 break;
1072 }
1073 }
1074 return res;
1075}
1076
1077/*
1078 * Note: call with stream lock
1079 */
1080static int snd_pcm_action_single(const struct action_ops *ops,
1081 struct snd_pcm_substream *substream,
1082 int state)
1083{
1084 int res;
1085
1086 res = ops->pre_action(substream, state);
1087 if (res < 0)
1088 return res;
1089 res = ops->do_action(substream, state);
1090 if (res == 0)
1091 ops->post_action(substream, state);
1092 else if (ops->undo_action)
1093 ops->undo_action(substream, state);
1094 return res;
1095}
1096
1097/*
1098 * Note: call with stream lock
1099 */
1100static int snd_pcm_action(const struct action_ops *ops,
1101 struct snd_pcm_substream *substream,
1102 int state)
1103{
1104 int res;
1105
1106 if (!snd_pcm_stream_linked(substream))
1107 return snd_pcm_action_single(ops, substream, state);
1108
1109 if (substream->pcm->nonatomic) {
1110 if (!mutex_trylock(&substream->group->mutex)) {
1111 mutex_unlock(&substream->self_group.mutex);
1112 mutex_lock(&substream->group->mutex);
1113 mutex_lock(&substream->self_group.mutex);
1114 }
1115 res = snd_pcm_action_group(ops, substream, state, 1);
1116 mutex_unlock(&substream->group->mutex);
1117 } else {
1118 if (!spin_trylock(&substream->group->lock)) {
1119 spin_unlock(&substream->self_group.lock);
1120 spin_lock(&substream->group->lock);
1121 spin_lock(&substream->self_group.lock);
1122 }
1123 res = snd_pcm_action_group(ops, substream, state, 1);
1124 spin_unlock(&substream->group->lock);
1125 }
1126 return res;
1127}
1128
1129/*
1130 * Note: don't use any locks before
1131 */
1132static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1133 struct snd_pcm_substream *substream,
1134 int state)
1135{
1136 int res;
1137
1138 snd_pcm_stream_lock_irq(substream);
1139 res = snd_pcm_action(ops, substream, state);
1140 snd_pcm_stream_unlock_irq(substream);
1141 return res;
1142}
1143
1144/*
1145 */
1146static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1147 struct snd_pcm_substream *substream,
1148 int state)
1149{
1150 int res;
1151
1152 down_read(&snd_pcm_link_rwsem);
1153 if (snd_pcm_stream_linked(substream))
1154 res = snd_pcm_action_group(ops, substream, state, 0);
1155 else
1156 res = snd_pcm_action_single(ops, substream, state);
1157 up_read(&snd_pcm_link_rwsem);
1158 return res;
1159}
1160
1161/*
1162 * start callbacks
1163 */
1164static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1165{
1166 struct snd_pcm_runtime *runtime = substream->runtime;
1167 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1168 return -EBADFD;
1169 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1170 !snd_pcm_playback_data(substream))
1171 return -EPIPE;
1172 runtime->trigger_tstamp_latched = false;
1173 runtime->trigger_master = substream;
1174 return 0;
1175}
1176
1177static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1178{
1179 if (substream->runtime->trigger_master != substream)
1180 return 0;
1181 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1182}
1183
1184static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1185{
1186 if (substream->runtime->trigger_master == substream)
1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1188}
1189
1190static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1191{
1192 struct snd_pcm_runtime *runtime = substream->runtime;
1193 snd_pcm_trigger_tstamp(substream);
1194 runtime->hw_ptr_jiffies = jiffies;
1195 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1196 runtime->rate;
1197 runtime->status->state = state;
1198 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1199 runtime->silence_size > 0)
1200 snd_pcm_playback_silence(substream, ULONG_MAX);
1201 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1202}
1203
1204static const struct action_ops snd_pcm_action_start = {
1205 .pre_action = snd_pcm_pre_start,
1206 .do_action = snd_pcm_do_start,
1207 .undo_action = snd_pcm_undo_start,
1208 .post_action = snd_pcm_post_start
1209};
1210
1211/**
1212 * snd_pcm_start - start all linked streams
1213 * @substream: the PCM substream instance
1214 *
1215 * Return: Zero if successful, or a negative error code.
1216 * The stream lock must be acquired before calling this function.
1217 */
1218int snd_pcm_start(struct snd_pcm_substream *substream)
1219{
1220 return snd_pcm_action(&snd_pcm_action_start, substream,
1221 SNDRV_PCM_STATE_RUNNING);
1222}
1223
1224/* take the stream lock and start the streams */
1225static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1226{
1227 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1228 SNDRV_PCM_STATE_RUNNING);
1229}
1230
1231/*
1232 * stop callbacks
1233 */
1234static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1235{
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1238 return -EBADFD;
1239 runtime->trigger_master = substream;
1240 return 0;
1241}
1242
1243static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1244{
1245 if (substream->runtime->trigger_master == substream &&
1246 snd_pcm_running(substream))
1247 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1248 return 0; /* unconditonally stop all substreams */
1249}
1250
1251static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1252{
1253 struct snd_pcm_runtime *runtime = substream->runtime;
1254 if (runtime->status->state != state) {
1255 snd_pcm_trigger_tstamp(substream);
1256 runtime->status->state = state;
1257 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1258 }
1259 wake_up(&runtime->sleep);
1260 wake_up(&runtime->tsleep);
1261}
1262
1263static const struct action_ops snd_pcm_action_stop = {
1264 .pre_action = snd_pcm_pre_stop,
1265 .do_action = snd_pcm_do_stop,
1266 .post_action = snd_pcm_post_stop
1267};
1268
1269/**
1270 * snd_pcm_stop - try to stop all running streams in the substream group
1271 * @substream: the PCM substream instance
1272 * @state: PCM state after stopping the stream
1273 *
1274 * The state of each stream is then changed to the given state unconditionally.
1275 *
1276 * Return: Zero if successful, or a negative error code.
1277 */
1278int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1279{
1280 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1281}
1282EXPORT_SYMBOL(snd_pcm_stop);
1283
1284/**
1285 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1286 * @substream: the PCM substream
1287 *
1288 * After stopping, the state is changed to SETUP.
1289 * Unlike snd_pcm_stop(), this affects only the given stream.
1290 *
1291 * Return: Zero if succesful, or a negative error code.
1292 */
1293int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1294{
1295 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1296 SNDRV_PCM_STATE_SETUP);
1297}
1298
1299/**
1300 * snd_pcm_stop_xrun - stop the running streams as XRUN
1301 * @substream: the PCM substream instance
1302 *
1303 * This stops the given running substream (and all linked substreams) as XRUN.
1304 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1305 *
1306 * Return: Zero if successful, or a negative error code.
1307 */
1308int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1309{
1310 unsigned long flags;
1311 int ret = 0;
1312
1313 snd_pcm_stream_lock_irqsave(substream, flags);
1314 if (snd_pcm_running(substream))
1315 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1316 snd_pcm_stream_unlock_irqrestore(substream, flags);
1317 return ret;
1318}
1319EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1320
1321/*
1322 * pause callbacks
1323 */
1324static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1325{
1326 struct snd_pcm_runtime *runtime = substream->runtime;
1327 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1328 return -ENOSYS;
1329 if (push) {
1330 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1331 return -EBADFD;
1332 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1333 return -EBADFD;
1334 runtime->trigger_master = substream;
1335 return 0;
1336}
1337
1338static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1339{
1340 if (substream->runtime->trigger_master != substream)
1341 return 0;
1342 /* some drivers might use hw_ptr to recover from the pause -
1343 update the hw_ptr now */
1344 if (push)
1345 snd_pcm_update_hw_ptr(substream);
1346 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1347 * a delta between the current jiffies, this gives a large enough
1348 * delta, effectively to skip the check once.
1349 */
1350 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1351 return substream->ops->trigger(substream,
1352 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1353 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1354}
1355
1356static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1357{
1358 if (substream->runtime->trigger_master == substream)
1359 substream->ops->trigger(substream,
1360 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1361 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1362}
1363
1364static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1365{
1366 struct snd_pcm_runtime *runtime = substream->runtime;
1367 snd_pcm_trigger_tstamp(substream);
1368 if (push) {
1369 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1370 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1371 wake_up(&runtime->sleep);
1372 wake_up(&runtime->tsleep);
1373 } else {
1374 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1375 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1376 }
1377}
1378
1379static const struct action_ops snd_pcm_action_pause = {
1380 .pre_action = snd_pcm_pre_pause,
1381 .do_action = snd_pcm_do_pause,
1382 .undo_action = snd_pcm_undo_pause,
1383 .post_action = snd_pcm_post_pause
1384};
1385
1386/*
1387 * Push/release the pause for all linked streams.
1388 */
1389static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1390{
1391 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1392}
1393
1394#ifdef CONFIG_PM
1395/* suspend */
1396
1397static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1398{
1399 struct snd_pcm_runtime *runtime = substream->runtime;
1400 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1401 return -EBUSY;
1402 runtime->trigger_master = substream;
1403 return 0;
1404}
1405
1406static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1407{
1408 struct snd_pcm_runtime *runtime = substream->runtime;
1409 if (runtime->trigger_master != substream)
1410 return 0;
1411 if (! snd_pcm_running(substream))
1412 return 0;
1413 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1414 return 0; /* suspend unconditionally */
1415}
1416
1417static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1418{
1419 struct snd_pcm_runtime *runtime = substream->runtime;
1420 snd_pcm_trigger_tstamp(substream);
1421 runtime->status->suspended_state = runtime->status->state;
1422 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1423 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1424 wake_up(&runtime->sleep);
1425 wake_up(&runtime->tsleep);
1426}
1427
1428static const struct action_ops snd_pcm_action_suspend = {
1429 .pre_action = snd_pcm_pre_suspend,
1430 .do_action = snd_pcm_do_suspend,
1431 .post_action = snd_pcm_post_suspend
1432};
1433
1434/**
1435 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1436 * @substream: the PCM substream
1437 *
1438 * After this call, all streams are changed to SUSPENDED state.
1439 *
1440 * Return: Zero if successful (or @substream is %NULL), or a negative error
1441 * code.
1442 */
1443int snd_pcm_suspend(struct snd_pcm_substream *substream)
1444{
1445 int err;
1446 unsigned long flags;
1447
1448 if (! substream)
1449 return 0;
1450
1451 snd_pcm_stream_lock_irqsave(substream, flags);
1452 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1453 snd_pcm_stream_unlock_irqrestore(substream, flags);
1454 return err;
1455}
1456EXPORT_SYMBOL(snd_pcm_suspend);
1457
1458/**
1459 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1460 * @pcm: the PCM instance
1461 *
1462 * After this call, all streams are changed to SUSPENDED state.
1463 *
1464 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1465 */
1466int snd_pcm_suspend_all(struct snd_pcm *pcm)
1467{
1468 struct snd_pcm_substream *substream;
1469 int stream, err = 0;
1470
1471 if (! pcm)
1472 return 0;
1473
1474 for (stream = 0; stream < 2; stream++) {
1475 for (substream = pcm->streams[stream].substream;
1476 substream; substream = substream->next) {
1477 /* FIXME: the open/close code should lock this as well */
1478 if (substream->runtime == NULL)
1479 continue;
1480 err = snd_pcm_suspend(substream);
1481 if (err < 0 && err != -EBUSY)
1482 return err;
1483 }
1484 }
1485 return 0;
1486}
1487EXPORT_SYMBOL(snd_pcm_suspend_all);
1488
1489/* resume */
1490
1491static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1492{
1493 struct snd_pcm_runtime *runtime = substream->runtime;
1494 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1495 return -ENOSYS;
1496 runtime->trigger_master = substream;
1497 return 0;
1498}
1499
1500static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1501{
1502 struct snd_pcm_runtime *runtime = substream->runtime;
1503 if (runtime->trigger_master != substream)
1504 return 0;
1505 /* DMA not running previously? */
1506 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1507 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1508 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1509 return 0;
1510 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1511}
1512
1513static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1514{
1515 if (substream->runtime->trigger_master == substream &&
1516 snd_pcm_running(substream))
1517 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1518}
1519
1520static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1521{
1522 struct snd_pcm_runtime *runtime = substream->runtime;
1523 snd_pcm_trigger_tstamp(substream);
1524 runtime->status->state = runtime->status->suspended_state;
1525 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1526}
1527
1528static const struct action_ops snd_pcm_action_resume = {
1529 .pre_action = snd_pcm_pre_resume,
1530 .do_action = snd_pcm_do_resume,
1531 .undo_action = snd_pcm_undo_resume,
1532 .post_action = snd_pcm_post_resume
1533};
1534
1535static int snd_pcm_resume(struct snd_pcm_substream *substream)
1536{
1537 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1538}
1539
1540#else
1541
1542static int snd_pcm_resume(struct snd_pcm_substream *substream)
1543{
1544 return -ENOSYS;
1545}
1546
1547#endif /* CONFIG_PM */
1548
1549/*
1550 * xrun ioctl
1551 *
1552 * Change the RUNNING stream(s) to XRUN state.
1553 */
1554static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1555{
1556 struct snd_pcm_runtime *runtime = substream->runtime;
1557 int result;
1558
1559 snd_pcm_stream_lock_irq(substream);
1560 switch (runtime->status->state) {
1561 case SNDRV_PCM_STATE_XRUN:
1562 result = 0; /* already there */
1563 break;
1564 case SNDRV_PCM_STATE_RUNNING:
1565 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1566 break;
1567 default:
1568 result = -EBADFD;
1569 }
1570 snd_pcm_stream_unlock_irq(substream);
1571 return result;
1572}
1573
1574/*
1575 * reset ioctl
1576 */
1577static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1578{
1579 struct snd_pcm_runtime *runtime = substream->runtime;
1580 switch (runtime->status->state) {
1581 case SNDRV_PCM_STATE_RUNNING:
1582 case SNDRV_PCM_STATE_PREPARED:
1583 case SNDRV_PCM_STATE_PAUSED:
1584 case SNDRV_PCM_STATE_SUSPENDED:
1585 return 0;
1586 default:
1587 return -EBADFD;
1588 }
1589}
1590
1591static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1592{
1593 struct snd_pcm_runtime *runtime = substream->runtime;
1594 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1595 if (err < 0)
1596 return err;
1597 runtime->hw_ptr_base = 0;
1598 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1599 runtime->status->hw_ptr % runtime->period_size;
1600 runtime->silence_start = runtime->status->hw_ptr;
1601 runtime->silence_filled = 0;
1602 return 0;
1603}
1604
1605static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1606{
1607 struct snd_pcm_runtime *runtime = substream->runtime;
1608 runtime->control->appl_ptr = runtime->status->hw_ptr;
1609 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1610 runtime->silence_size > 0)
1611 snd_pcm_playback_silence(substream, ULONG_MAX);
1612}
1613
1614static const struct action_ops snd_pcm_action_reset = {
1615 .pre_action = snd_pcm_pre_reset,
1616 .do_action = snd_pcm_do_reset,
1617 .post_action = snd_pcm_post_reset
1618};
1619
1620static int snd_pcm_reset(struct snd_pcm_substream *substream)
1621{
1622 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1623}
1624
1625/*
1626 * prepare ioctl
1627 */
1628/* we use the second argument for updating f_flags */
1629static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1630 int f_flags)
1631{
1632 struct snd_pcm_runtime *runtime = substream->runtime;
1633 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1634 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1635 return -EBADFD;
1636 if (snd_pcm_running(substream))
1637 return -EBUSY;
1638 substream->f_flags = f_flags;
1639 return 0;
1640}
1641
1642static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1643{
1644 int err;
1645 err = substream->ops->prepare(substream);
1646 if (err < 0)
1647 return err;
1648 return snd_pcm_do_reset(substream, 0);
1649}
1650
1651static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1652{
1653 struct snd_pcm_runtime *runtime = substream->runtime;
1654 runtime->control->appl_ptr = runtime->status->hw_ptr;
1655 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1656}
1657
1658static const struct action_ops snd_pcm_action_prepare = {
1659 .pre_action = snd_pcm_pre_prepare,
1660 .do_action = snd_pcm_do_prepare,
1661 .post_action = snd_pcm_post_prepare
1662};
1663
1664/**
1665 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1666 * @substream: the PCM substream instance
1667 * @file: file to refer f_flags
1668 *
1669 * Return: Zero if successful, or a negative error code.
1670 */
1671static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1672 struct file *file)
1673{
1674 int f_flags;
1675
1676 if (file)
1677 f_flags = file->f_flags;
1678 else
1679 f_flags = substream->f_flags;
1680
1681 snd_pcm_stream_lock_irq(substream);
1682 switch (substream->runtime->status->state) {
1683 case SNDRV_PCM_STATE_PAUSED:
1684 snd_pcm_pause(substream, 0);
1685 /* fallthru */
1686 case SNDRV_PCM_STATE_SUSPENDED:
1687 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1688 break;
1689 }
1690 snd_pcm_stream_unlock_irq(substream);
1691
1692 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1693 substream, f_flags);
1694}
1695
1696/*
1697 * drain ioctl
1698 */
1699
1700static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1701{
1702 struct snd_pcm_runtime *runtime = substream->runtime;
1703 switch (runtime->status->state) {
1704 case SNDRV_PCM_STATE_OPEN:
1705 case SNDRV_PCM_STATE_DISCONNECTED:
1706 case SNDRV_PCM_STATE_SUSPENDED:
1707 return -EBADFD;
1708 }
1709 runtime->trigger_master = substream;
1710 return 0;
1711}
1712
1713static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1714{
1715 struct snd_pcm_runtime *runtime = substream->runtime;
1716 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1717 switch (runtime->status->state) {
1718 case SNDRV_PCM_STATE_PREPARED:
1719 /* start playback stream if possible */
1720 if (! snd_pcm_playback_empty(substream)) {
1721 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1722 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1723 } else {
1724 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1725 }
1726 break;
1727 case SNDRV_PCM_STATE_RUNNING:
1728 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1729 break;
1730 case SNDRV_PCM_STATE_XRUN:
1731 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1732 break;
1733 default:
1734 break;
1735 }
1736 } else {
1737 /* stop running stream */
1738 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1739 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1740 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1741 snd_pcm_do_stop(substream, new_state);
1742 snd_pcm_post_stop(substream, new_state);
1743 }
1744 }
1745
1746 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1747 runtime->trigger_master == substream &&
1748 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1749 return substream->ops->trigger(substream,
1750 SNDRV_PCM_TRIGGER_DRAIN);
1751
1752 return 0;
1753}
1754
1755static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1756{
1757}
1758
1759static const struct action_ops snd_pcm_action_drain_init = {
1760 .pre_action = snd_pcm_pre_drain_init,
1761 .do_action = snd_pcm_do_drain_init,
1762 .post_action = snd_pcm_post_drain_init
1763};
1764
1765static int snd_pcm_drop(struct snd_pcm_substream *substream);
1766
1767/*
1768 * Drain the stream(s).
1769 * When the substream is linked, sync until the draining of all playback streams
1770 * is finished.
1771 * After this call, all streams are supposed to be either SETUP or DRAINING
1772 * (capture only) state.
1773 */
1774static int snd_pcm_drain(struct snd_pcm_substream *substream,
1775 struct file *file)
1776{
1777 struct snd_card *card;
1778 struct snd_pcm_runtime *runtime;
1779 struct snd_pcm_substream *s;
1780 wait_queue_entry_t wait;
1781 int result = 0;
1782 int nonblock = 0;
1783
1784 card = substream->pcm->card;
1785 runtime = substream->runtime;
1786
1787 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1788 return -EBADFD;
1789
1790 if (file) {
1791 if (file->f_flags & O_NONBLOCK)
1792 nonblock = 1;
1793 } else if (substream->f_flags & O_NONBLOCK)
1794 nonblock = 1;
1795
1796 down_read(&snd_pcm_link_rwsem);
1797 snd_pcm_stream_lock_irq(substream);
1798 /* resume pause */
1799 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1800 snd_pcm_pause(substream, 0);
1801
1802 /* pre-start/stop - all running streams are changed to DRAINING state */
1803 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1804 if (result < 0)
1805 goto unlock;
1806 /* in non-blocking, we don't wait in ioctl but let caller poll */
1807 if (nonblock) {
1808 result = -EAGAIN;
1809 goto unlock;
1810 }
1811
1812 for (;;) {
1813 long tout;
1814 struct snd_pcm_runtime *to_check;
1815 if (signal_pending(current)) {
1816 result = -ERESTARTSYS;
1817 break;
1818 }
1819 /* find a substream to drain */
1820 to_check = NULL;
1821 snd_pcm_group_for_each_entry(s, substream) {
1822 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1823 continue;
1824 runtime = s->runtime;
1825 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1826 to_check = runtime;
1827 break;
1828 }
1829 }
1830 if (!to_check)
1831 break; /* all drained */
1832 init_waitqueue_entry(&wait, current);
1833 add_wait_queue(&to_check->sleep, &wait);
1834 snd_pcm_stream_unlock_irq(substream);
1835 up_read(&snd_pcm_link_rwsem);
1836 if (runtime->no_period_wakeup)
1837 tout = MAX_SCHEDULE_TIMEOUT;
1838 else {
1839 tout = 10;
1840 if (runtime->rate) {
1841 long t = runtime->period_size * 2 / runtime->rate;
1842 tout = max(t, tout);
1843 }
1844 tout = msecs_to_jiffies(tout * 1000);
1845 }
1846 tout = schedule_timeout_interruptible(tout);
1847 down_read(&snd_pcm_link_rwsem);
1848 snd_pcm_stream_lock_irq(substream);
1849 remove_wait_queue(&to_check->sleep, &wait);
1850 if (card->shutdown) {
1851 result = -ENODEV;
1852 break;
1853 }
1854 if (tout == 0) {
1855 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1856 result = -ESTRPIPE;
1857 else {
1858 dev_dbg(substream->pcm->card->dev,
1859 "playback drain error (DMA or IRQ trouble?)\n");
1860 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1861 result = -EIO;
1862 }
1863 break;
1864 }
1865 }
1866
1867 unlock:
1868 snd_pcm_stream_unlock_irq(substream);
1869 up_read(&snd_pcm_link_rwsem);
1870
1871 return result;
1872}
1873
1874/*
1875 * drop ioctl
1876 *
1877 * Immediately put all linked substreams into SETUP state.
1878 */
1879static int snd_pcm_drop(struct snd_pcm_substream *substream)
1880{
1881 struct snd_pcm_runtime *runtime;
1882 int result = 0;
1883
1884 if (PCM_RUNTIME_CHECK(substream))
1885 return -ENXIO;
1886 runtime = substream->runtime;
1887
1888 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1889 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1890 return -EBADFD;
1891
1892 snd_pcm_stream_lock_irq(substream);
1893 /* resume pause */
1894 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1895 snd_pcm_pause(substream, 0);
1896
1897 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1898 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1899 snd_pcm_stream_unlock_irq(substream);
1900
1901 return result;
1902}
1903
1904
1905static bool is_pcm_file(struct file *file)
1906{
1907 struct inode *inode = file_inode(file);
1908 unsigned int minor;
1909
1910 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1911 return false;
1912 minor = iminor(inode);
1913 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1914 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1915}
1916
1917/*
1918 * PCM link handling
1919 */
1920static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1921{
1922 int res = 0;
1923 struct snd_pcm_file *pcm_file;
1924 struct snd_pcm_substream *substream1;
1925 struct snd_pcm_group *group;
1926 struct fd f = fdget(fd);
1927
1928 if (!f.file)
1929 return -EBADFD;
1930 if (!is_pcm_file(f.file)) {
1931 res = -EBADFD;
1932 goto _badf;
1933 }
1934 pcm_file = f.file->private_data;
1935 substream1 = pcm_file->substream;
1936 group = kmalloc(sizeof(*group), GFP_KERNEL);
1937 if (!group) {
1938 res = -ENOMEM;
1939 goto _nolock;
1940 }
1941 down_write_nonblock(&snd_pcm_link_rwsem);
1942 write_lock_irq(&snd_pcm_link_rwlock);
1943 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1944 substream->runtime->status->state != substream1->runtime->status->state ||
1945 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1946 res = -EBADFD;
1947 goto _end;
1948 }
1949 if (snd_pcm_stream_linked(substream1)) {
1950 res = -EALREADY;
1951 goto _end;
1952 }
1953 if (!snd_pcm_stream_linked(substream)) {
1954 substream->group = group;
1955 group = NULL;
1956 spin_lock_init(&substream->group->lock);
1957 mutex_init(&substream->group->mutex);
1958 INIT_LIST_HEAD(&substream->group->substreams);
1959 list_add_tail(&substream->link_list, &substream->group->substreams);
1960 substream->group->count = 1;
1961 }
1962 list_add_tail(&substream1->link_list, &substream->group->substreams);
1963 substream->group->count++;
1964 substream1->group = substream->group;
1965 _end:
1966 write_unlock_irq(&snd_pcm_link_rwlock);
1967 up_write(&snd_pcm_link_rwsem);
1968 _nolock:
1969 snd_card_unref(substream1->pcm->card);
1970 kfree(group);
1971 _badf:
1972 fdput(f);
1973 return res;
1974}
1975
1976static void relink_to_local(struct snd_pcm_substream *substream)
1977{
1978 substream->group = &substream->self_group;
1979 INIT_LIST_HEAD(&substream->self_group.substreams);
1980 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1981}
1982
1983static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1984{
1985 struct snd_pcm_substream *s;
1986 int res = 0;
1987
1988 down_write_nonblock(&snd_pcm_link_rwsem);
1989 write_lock_irq(&snd_pcm_link_rwlock);
1990 if (!snd_pcm_stream_linked(substream)) {
1991 res = -EALREADY;
1992 goto _end;
1993 }
1994 list_del(&substream->link_list);
1995 substream->group->count--;
1996 if (substream->group->count == 1) { /* detach the last stream, too */
1997 snd_pcm_group_for_each_entry(s, substream) {
1998 relink_to_local(s);
1999 break;
2000 }
2001 kfree(substream->group);
2002 }
2003 relink_to_local(substream);
2004 _end:
2005 write_unlock_irq(&snd_pcm_link_rwlock);
2006 up_write(&snd_pcm_link_rwsem);
2007 return res;
2008}
2009
2010/*
2011 * hw configurator
2012 */
2013static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2014 struct snd_pcm_hw_rule *rule)
2015{
2016 struct snd_interval t;
2017 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2018 hw_param_interval_c(params, rule->deps[1]), &t);
2019 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2020}
2021
2022static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2023 struct snd_pcm_hw_rule *rule)
2024{
2025 struct snd_interval t;
2026 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2027 hw_param_interval_c(params, rule->deps[1]), &t);
2028 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2029}
2030
2031static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2032 struct snd_pcm_hw_rule *rule)
2033{
2034 struct snd_interval t;
2035 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2036 hw_param_interval_c(params, rule->deps[1]),
2037 (unsigned long) rule->private, &t);
2038 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2039}
2040
2041static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2042 struct snd_pcm_hw_rule *rule)
2043{
2044 struct snd_interval t;
2045 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2046 (unsigned long) rule->private,
2047 hw_param_interval_c(params, rule->deps[1]), &t);
2048 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2049}
2050
2051static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2052 struct snd_pcm_hw_rule *rule)
2053{
2054 unsigned int k;
2055 const struct snd_interval *i =
2056 hw_param_interval_c(params, rule->deps[0]);
2057 struct snd_mask m;
2058 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2059 snd_mask_any(&m);
2060 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2061 int bits;
2062 if (! snd_mask_test(mask, k))
2063 continue;
2064 bits = snd_pcm_format_physical_width(k);
2065 if (bits <= 0)
2066 continue; /* ignore invalid formats */
2067 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2068 snd_mask_reset(&m, k);
2069 }
2070 return snd_mask_refine(mask, &m);
2071}
2072
2073static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2074 struct snd_pcm_hw_rule *rule)
2075{
2076 struct snd_interval t;
2077 unsigned int k;
2078 t.min = UINT_MAX;
2079 t.max = 0;
2080 t.openmin = 0;
2081 t.openmax = 0;
2082 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2083 int bits;
2084 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2085 continue;
2086 bits = snd_pcm_format_physical_width(k);
2087 if (bits <= 0)
2088 continue; /* ignore invalid formats */
2089 if (t.min > (unsigned)bits)
2090 t.min = bits;
2091 if (t.max < (unsigned)bits)
2092 t.max = bits;
2093 }
2094 t.integer = 1;
2095 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2096}
2097
2098#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2099#error "Change this table"
2100#endif
2101
2102static const unsigned int rates[] = {
2103 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2104 48000, 64000, 88200, 96000, 176400, 192000
2105};
2106
2107const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2108 .count = ARRAY_SIZE(rates),
2109 .list = rates,
2110};
2111
2112static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2113 struct snd_pcm_hw_rule *rule)
2114{
2115 struct snd_pcm_hardware *hw = rule->private;
2116 return snd_interval_list(hw_param_interval(params, rule->var),
2117 snd_pcm_known_rates.count,
2118 snd_pcm_known_rates.list, hw->rates);
2119}
2120
2121static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2122 struct snd_pcm_hw_rule *rule)
2123{
2124 struct snd_interval t;
2125 struct snd_pcm_substream *substream = rule->private;
2126 t.min = 0;
2127 t.max = substream->buffer_bytes_max;
2128 t.openmin = 0;
2129 t.openmax = 0;
2130 t.integer = 1;
2131 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2132}
2133
2134int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2135{
2136 struct snd_pcm_runtime *runtime = substream->runtime;
2137 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2138 int k, err;
2139
2140 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2141 snd_mask_any(constrs_mask(constrs, k));
2142 }
2143
2144 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2145 snd_interval_any(constrs_interval(constrs, k));
2146 }
2147
2148 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2149 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2150 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2151 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2152 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2153
2154 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2155 snd_pcm_hw_rule_format, NULL,
2156 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2157 if (err < 0)
2158 return err;
2159 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2160 snd_pcm_hw_rule_sample_bits, NULL,
2161 SNDRV_PCM_HW_PARAM_FORMAT,
2162 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2163 if (err < 0)
2164 return err;
2165 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2166 snd_pcm_hw_rule_div, NULL,
2167 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2168 if (err < 0)
2169 return err;
2170 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2171 snd_pcm_hw_rule_mul, NULL,
2172 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2173 if (err < 0)
2174 return err;
2175 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2176 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2177 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2178 if (err < 0)
2179 return err;
2180 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2181 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2182 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2183 if (err < 0)
2184 return err;
2185 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2186 snd_pcm_hw_rule_div, NULL,
2187 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2188 if (err < 0)
2189 return err;
2190 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2191 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2192 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2193 if (err < 0)
2194 return err;
2195 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2196 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2197 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2198 if (err < 0)
2199 return err;
2200 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2201 snd_pcm_hw_rule_div, NULL,
2202 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2203 if (err < 0)
2204 return err;
2205 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2206 snd_pcm_hw_rule_div, NULL,
2207 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2208 if (err < 0)
2209 return err;
2210 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2211 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2212 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2213 if (err < 0)
2214 return err;
2215 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2216 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2217 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2218 if (err < 0)
2219 return err;
2220 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2221 snd_pcm_hw_rule_mul, NULL,
2222 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2223 if (err < 0)
2224 return err;
2225 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2226 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2227 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2228 if (err < 0)
2229 return err;
2230 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2231 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2232 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2233 if (err < 0)
2234 return err;
2235 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2236 snd_pcm_hw_rule_muldivk, (void*) 8,
2237 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2238 if (err < 0)
2239 return err;
2240 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2241 snd_pcm_hw_rule_muldivk, (void*) 8,
2242 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2243 if (err < 0)
2244 return err;
2245 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2246 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2247 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2248 if (err < 0)
2249 return err;
2250 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2251 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2252 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2253 if (err < 0)
2254 return err;
2255 return 0;
2256}
2257
2258int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2259{
2260 struct snd_pcm_runtime *runtime = substream->runtime;
2261 struct snd_pcm_hardware *hw = &runtime->hw;
2262 int err;
2263 unsigned int mask = 0;
2264
2265 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2266 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2267 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2268 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2269 if (hw_support_mmap(substream)) {
2270 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2271 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2272 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2273 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2274 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2275 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2276 }
2277 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2278 if (err < 0)
2279 return err;
2280
2281 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2282 if (err < 0)
2283 return err;
2284
2285 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2286 if (err < 0)
2287 return err;
2288
2289 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2290 hw->channels_min, hw->channels_max);
2291 if (err < 0)
2292 return err;
2293
2294 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2295 hw->rate_min, hw->rate_max);
2296 if (err < 0)
2297 return err;
2298
2299 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2300 hw->period_bytes_min, hw->period_bytes_max);
2301 if (err < 0)
2302 return err;
2303
2304 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2305 hw->periods_min, hw->periods_max);
2306 if (err < 0)
2307 return err;
2308
2309 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2310 hw->period_bytes_min, hw->buffer_bytes_max);
2311 if (err < 0)
2312 return err;
2313
2314 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2315 snd_pcm_hw_rule_buffer_bytes_max, substream,
2316 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2317 if (err < 0)
2318 return err;
2319
2320 /* FIXME: remove */
2321 if (runtime->dma_bytes) {
2322 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2323 if (err < 0)
2324 return err;
2325 }
2326
2327 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2328 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2329 snd_pcm_hw_rule_rate, hw,
2330 SNDRV_PCM_HW_PARAM_RATE, -1);
2331 if (err < 0)
2332 return err;
2333 }
2334
2335 /* FIXME: this belong to lowlevel */
2336 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2337
2338 return 0;
2339}
2340
2341static void pcm_release_private(struct snd_pcm_substream *substream)
2342{
2343 snd_pcm_unlink(substream);
2344}
2345
2346void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2347{
2348 substream->ref_count--;
2349 if (substream->ref_count > 0)
2350 return;
2351
2352 snd_pcm_drop(substream);
2353 if (substream->hw_opened) {
2354 if (substream->ops->hw_free &&
2355 substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2356 substream->ops->hw_free(substream);
2357 substream->ops->close(substream);
2358 substream->hw_opened = 0;
2359 }
2360 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2361 pm_qos_remove_request(&substream->latency_pm_qos_req);
2362 if (substream->pcm_release) {
2363 substream->pcm_release(substream);
2364 substream->pcm_release = NULL;
2365 }
2366 snd_pcm_detach_substream(substream);
2367}
2368EXPORT_SYMBOL(snd_pcm_release_substream);
2369
2370int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2371 struct file *file,
2372 struct snd_pcm_substream **rsubstream)
2373{
2374 struct snd_pcm_substream *substream;
2375 int err;
2376
2377 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2378 if (err < 0)
2379 return err;
2380 if (substream->ref_count > 1) {
2381 *rsubstream = substream;
2382 return 0;
2383 }
2384
2385 err = snd_pcm_hw_constraints_init(substream);
2386 if (err < 0) {
2387 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2388 goto error;
2389 }
2390
2391 if ((err = substream->ops->open(substream)) < 0)
2392 goto error;
2393
2394 substream->hw_opened = 1;
2395
2396 err = snd_pcm_hw_constraints_complete(substream);
2397 if (err < 0) {
2398 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2399 goto error;
2400 }
2401
2402 *rsubstream = substream;
2403 return 0;
2404
2405 error:
2406 snd_pcm_release_substream(substream);
2407 return err;
2408}
2409EXPORT_SYMBOL(snd_pcm_open_substream);
2410
2411static int snd_pcm_open_file(struct file *file,
2412 struct snd_pcm *pcm,
2413 int stream)
2414{
2415 struct snd_pcm_file *pcm_file;
2416 struct snd_pcm_substream *substream;
2417 int err;
2418
2419 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2420 if (err < 0)
2421 return err;
2422
2423 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2424 if (pcm_file == NULL) {
2425 snd_pcm_release_substream(substream);
2426 return -ENOMEM;
2427 }
2428 pcm_file->substream = substream;
2429 if (substream->ref_count == 1) {
2430 substream->file = pcm_file;
2431 substream->pcm_release = pcm_release_private;
2432 }
2433 file->private_data = pcm_file;
2434
2435 return 0;
2436}
2437
2438static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2439{
2440 struct snd_pcm *pcm;
2441 int err = nonseekable_open(inode, file);
2442 if (err < 0)
2443 return err;
2444 pcm = snd_lookup_minor_data(iminor(inode),
2445 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2446 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2447 if (pcm)
2448 snd_card_unref(pcm->card);
2449 return err;
2450}
2451
2452static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2453{
2454 struct snd_pcm *pcm;
2455 int err = nonseekable_open(inode, file);
2456 if (err < 0)
2457 return err;
2458 pcm = snd_lookup_minor_data(iminor(inode),
2459 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2460 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2461 if (pcm)
2462 snd_card_unref(pcm->card);
2463 return err;
2464}
2465
2466static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2467{
2468 int err;
2469 wait_queue_entry_t wait;
2470
2471 if (pcm == NULL) {
2472 err = -ENODEV;
2473 goto __error1;
2474 }
2475 err = snd_card_file_add(pcm->card, file);
2476 if (err < 0)
2477 goto __error1;
2478 if (!try_module_get(pcm->card->module)) {
2479 err = -EFAULT;
2480 goto __error2;
2481 }
2482 init_waitqueue_entry(&wait, current);
2483 add_wait_queue(&pcm->open_wait, &wait);
2484 mutex_lock(&pcm->open_mutex);
2485 while (1) {
2486 err = snd_pcm_open_file(file, pcm, stream);
2487 if (err >= 0)
2488 break;
2489 if (err == -EAGAIN) {
2490 if (file->f_flags & O_NONBLOCK) {
2491 err = -EBUSY;
2492 break;
2493 }
2494 } else
2495 break;
2496 set_current_state(TASK_INTERRUPTIBLE);
2497 mutex_unlock(&pcm->open_mutex);
2498 schedule();
2499 mutex_lock(&pcm->open_mutex);
2500 if (pcm->card->shutdown) {
2501 err = -ENODEV;
2502 break;
2503 }
2504 if (signal_pending(current)) {
2505 err = -ERESTARTSYS;
2506 break;
2507 }
2508 }
2509 remove_wait_queue(&pcm->open_wait, &wait);
2510 mutex_unlock(&pcm->open_mutex);
2511 if (err < 0)
2512 goto __error;
2513 return err;
2514
2515 __error:
2516 module_put(pcm->card->module);
2517 __error2:
2518 snd_card_file_remove(pcm->card, file);
2519 __error1:
2520 return err;
2521}
2522
2523static int snd_pcm_release(struct inode *inode, struct file *file)
2524{
2525 struct snd_pcm *pcm;
2526 struct snd_pcm_substream *substream;
2527 struct snd_pcm_file *pcm_file;
2528
2529 pcm_file = file->private_data;
2530 substream = pcm_file->substream;
2531 if (snd_BUG_ON(!substream))
2532 return -ENXIO;
2533 pcm = substream->pcm;
2534 mutex_lock(&pcm->open_mutex);
2535 snd_pcm_release_substream(substream);
2536 kfree(pcm_file);
2537 mutex_unlock(&pcm->open_mutex);
2538 wake_up(&pcm->open_wait);
2539 module_put(pcm->card->module);
2540 snd_card_file_remove(pcm->card, file);
2541 return 0;
2542}
2543
2544/* check and update PCM state; return 0 or a negative error
2545 * call this inside PCM lock
2546 */
2547static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2548{
2549 switch (substream->runtime->status->state) {
2550 case SNDRV_PCM_STATE_DRAINING:
2551 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2552 return -EBADFD;
2553 /* Fall through */
2554 case SNDRV_PCM_STATE_RUNNING:
2555 return snd_pcm_update_hw_ptr(substream);
2556 case SNDRV_PCM_STATE_PREPARED:
2557 case SNDRV_PCM_STATE_PAUSED:
2558 return 0;
2559 case SNDRV_PCM_STATE_SUSPENDED:
2560 return -ESTRPIPE;
2561 case SNDRV_PCM_STATE_XRUN:
2562 return -EPIPE;
2563 default:
2564 return -EBADFD;
2565 }
2566}
2567
2568/* increase the appl_ptr; returns the processed frames or a negative error */
2569static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2570 snd_pcm_uframes_t frames,
2571 snd_pcm_sframes_t avail)
2572{
2573 struct snd_pcm_runtime *runtime = substream->runtime;
2574 snd_pcm_sframes_t appl_ptr;
2575 int ret;
2576
2577 if (avail <= 0)
2578 return 0;
2579 if (frames > (snd_pcm_uframes_t)avail)
2580 frames = avail;
2581 appl_ptr = runtime->control->appl_ptr + frames;
2582 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2583 appl_ptr -= runtime->boundary;
2584 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2585 return ret < 0 ? ret : frames;
2586}
2587
2588/* decrease the appl_ptr; returns the processed frames or zero for error */
2589static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2590 snd_pcm_uframes_t frames,
2591 snd_pcm_sframes_t avail)
2592{
2593 struct snd_pcm_runtime *runtime = substream->runtime;
2594 snd_pcm_sframes_t appl_ptr;
2595 int ret;
2596
2597 if (avail <= 0)
2598 return 0;
2599 if (frames > (snd_pcm_uframes_t)avail)
2600 frames = avail;
2601 appl_ptr = runtime->control->appl_ptr - frames;
2602 if (appl_ptr < 0)
2603 appl_ptr += runtime->boundary;
2604 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2605 /* NOTE: we return zero for errors because PulseAudio gets depressed
2606 * upon receiving an error from rewind ioctl and stops processing
2607 * any longer. Returning zero means that no rewind is done, so
2608 * it's not absolutely wrong to answer like that.
2609 */
2610 return ret < 0 ? 0 : frames;
2611}
2612
2613static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2614 snd_pcm_uframes_t frames)
2615{
2616 struct snd_pcm_runtime *runtime = substream->runtime;
2617 snd_pcm_sframes_t ret;
2618
2619 if (frames == 0)
2620 return 0;
2621
2622 snd_pcm_stream_lock_irq(substream);
2623 ret = do_pcm_hwsync(substream);
2624 if (!ret)
2625 ret = rewind_appl_ptr(substream, frames,
2626 snd_pcm_playback_hw_avail(runtime));
2627 snd_pcm_stream_unlock_irq(substream);
2628 return ret;
2629}
2630
2631static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2632 snd_pcm_uframes_t frames)
2633{
2634 struct snd_pcm_runtime *runtime = substream->runtime;
2635 snd_pcm_sframes_t ret;
2636
2637 if (frames == 0)
2638 return 0;
2639
2640 snd_pcm_stream_lock_irq(substream);
2641 ret = do_pcm_hwsync(substream);
2642 if (!ret)
2643 ret = rewind_appl_ptr(substream, frames,
2644 snd_pcm_capture_hw_avail(runtime));
2645 snd_pcm_stream_unlock_irq(substream);
2646 return ret;
2647}
2648
2649static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2650 snd_pcm_uframes_t frames)
2651{
2652 struct snd_pcm_runtime *runtime = substream->runtime;
2653 snd_pcm_sframes_t ret;
2654
2655 if (frames == 0)
2656 return 0;
2657
2658 snd_pcm_stream_lock_irq(substream);
2659 ret = do_pcm_hwsync(substream);
2660 if (!ret)
2661 ret = forward_appl_ptr(substream, frames,
2662 snd_pcm_playback_avail(runtime));
2663 snd_pcm_stream_unlock_irq(substream);
2664 return ret;
2665}
2666
2667static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2668 snd_pcm_uframes_t frames)
2669{
2670 struct snd_pcm_runtime *runtime = substream->runtime;
2671 snd_pcm_sframes_t ret;
2672
2673 if (frames == 0)
2674 return 0;
2675
2676 snd_pcm_stream_lock_irq(substream);
2677 ret = do_pcm_hwsync(substream);
2678 if (!ret)
2679 ret = forward_appl_ptr(substream, frames,
2680 snd_pcm_capture_avail(runtime));
2681 snd_pcm_stream_unlock_irq(substream);
2682 return ret;
2683}
2684
2685static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2686{
2687 int err;
2688
2689 snd_pcm_stream_lock_irq(substream);
2690 err = do_pcm_hwsync(substream);
2691 snd_pcm_stream_unlock_irq(substream);
2692 return err;
2693}
2694
2695static int snd_pcm_delay(struct snd_pcm_substream *substream,
2696 snd_pcm_sframes_t *delay)
2697{
2698 struct snd_pcm_runtime *runtime = substream->runtime;
2699 int err;
2700 snd_pcm_sframes_t n = 0;
2701
2702 snd_pcm_stream_lock_irq(substream);
2703 err = do_pcm_hwsync(substream);
2704 if (!err) {
2705 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2706 n = snd_pcm_playback_hw_avail(runtime);
2707 else
2708 n = snd_pcm_capture_avail(runtime);
2709 n += runtime->delay;
2710 }
2711 snd_pcm_stream_unlock_irq(substream);
2712 if (!err)
2713 *delay = n;
2714 return err;
2715}
2716
2717static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2718 struct snd_pcm_sync_ptr __user *_sync_ptr)
2719{
2720 struct snd_pcm_runtime *runtime = substream->runtime;
2721 struct snd_pcm_sync_ptr sync_ptr;
2722 volatile struct snd_pcm_mmap_status *status;
2723 volatile struct snd_pcm_mmap_control *control;
2724 int err;
2725
2726 memset(&sync_ptr, 0, sizeof(sync_ptr));
2727 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2728 return -EFAULT;
2729 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2730 return -EFAULT;
2731 status = runtime->status;
2732 control = runtime->control;
2733 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2734 err = snd_pcm_hwsync(substream);
2735 if (err < 0)
2736 return err;
2737 }
2738 snd_pcm_stream_lock_irq(substream);
2739 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2740 err = pcm_lib_apply_appl_ptr(substream,
2741 sync_ptr.c.control.appl_ptr);
2742 if (err < 0) {
2743 snd_pcm_stream_unlock_irq(substream);
2744 return err;
2745 }
2746 } else {
2747 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2748 }
2749 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2750 control->avail_min = sync_ptr.c.control.avail_min;
2751 else
2752 sync_ptr.c.control.avail_min = control->avail_min;
2753 sync_ptr.s.status.state = status->state;
2754 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2755 sync_ptr.s.status.tstamp = status->tstamp;
2756 sync_ptr.s.status.suspended_state = status->suspended_state;
2757 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2758 snd_pcm_stream_unlock_irq(substream);
2759 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2760 return -EFAULT;
2761 return 0;
2762}
2763
2764static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2765{
2766 struct snd_pcm_runtime *runtime = substream->runtime;
2767 int arg;
2768
2769 if (get_user(arg, _arg))
2770 return -EFAULT;
2771 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2772 return -EINVAL;
2773 runtime->tstamp_type = arg;
2774 return 0;
2775}
2776
2777static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2778 struct snd_xferi __user *_xferi)
2779{
2780 struct snd_xferi xferi;
2781 struct snd_pcm_runtime *runtime = substream->runtime;
2782 snd_pcm_sframes_t result;
2783
2784 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2785 return -EBADFD;
2786 if (put_user(0, &_xferi->result))
2787 return -EFAULT;
2788 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2789 return -EFAULT;
2790 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2791 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2792 else
2793 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2794 __put_user(result, &_xferi->result);
2795 return result < 0 ? result : 0;
2796}
2797
2798static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2799 struct snd_xfern __user *_xfern)
2800{
2801 struct snd_xfern xfern;
2802 struct snd_pcm_runtime *runtime = substream->runtime;
2803 void *bufs;
2804 snd_pcm_sframes_t result;
2805
2806 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2807 return -EBADFD;
2808 if (runtime->channels > 128)
2809 return -EINVAL;
2810 if (put_user(0, &_xfern->result))
2811 return -EFAULT;
2812 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2813 return -EFAULT;
2814
2815 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2816 if (IS_ERR(bufs))
2817 return PTR_ERR(bufs);
2818 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2819 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2820 else
2821 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2822 kfree(bufs);
2823 __put_user(result, &_xfern->result);
2824 return result < 0 ? result : 0;
2825}
2826
2827static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2828 snd_pcm_uframes_t __user *_frames)
2829{
2830 snd_pcm_uframes_t frames;
2831 snd_pcm_sframes_t result;
2832
2833 if (get_user(frames, _frames))
2834 return -EFAULT;
2835 if (put_user(0, _frames))
2836 return -EFAULT;
2837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2838 result = snd_pcm_playback_rewind(substream, frames);
2839 else
2840 result = snd_pcm_capture_rewind(substream, frames);
2841 __put_user(result, _frames);
2842 return result < 0 ? result : 0;
2843}
2844
2845static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2846 snd_pcm_uframes_t __user *_frames)
2847{
2848 snd_pcm_uframes_t frames;
2849 snd_pcm_sframes_t result;
2850
2851 if (get_user(frames, _frames))
2852 return -EFAULT;
2853 if (put_user(0, _frames))
2854 return -EFAULT;
2855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2856 result = snd_pcm_playback_forward(substream, frames);
2857 else
2858 result = snd_pcm_capture_forward(substream, frames);
2859 __put_user(result, _frames);
2860 return result < 0 ? result : 0;
2861}
2862
2863static int snd_pcm_common_ioctl(struct file *file,
2864 struct snd_pcm_substream *substream,
2865 unsigned int cmd, void __user *arg)
2866{
2867 struct snd_pcm_file *pcm_file = file->private_data;
2868 int res;
2869
2870 if (PCM_RUNTIME_CHECK(substream))
2871 return -ENXIO;
2872
2873 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2874 if (res < 0)
2875 return res;
2876
2877 switch (cmd) {
2878 case SNDRV_PCM_IOCTL_PVERSION:
2879 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2880 case SNDRV_PCM_IOCTL_INFO:
2881 return snd_pcm_info_user(substream, arg);
2882 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2883 return 0;
2884 case SNDRV_PCM_IOCTL_TTSTAMP:
2885 return snd_pcm_tstamp(substream, arg);
2886 case SNDRV_PCM_IOCTL_USER_PVERSION:
2887 if (get_user(pcm_file->user_pversion,
2888 (unsigned int __user *)arg))
2889 return -EFAULT;
2890 return 0;
2891 case SNDRV_PCM_IOCTL_HW_REFINE:
2892 return snd_pcm_hw_refine_user(substream, arg);
2893 case SNDRV_PCM_IOCTL_HW_PARAMS:
2894 return snd_pcm_hw_params_user(substream, arg);
2895 case SNDRV_PCM_IOCTL_HW_FREE:
2896 return snd_pcm_hw_free(substream);
2897 case SNDRV_PCM_IOCTL_SW_PARAMS:
2898 return snd_pcm_sw_params_user(substream, arg);
2899 case SNDRV_PCM_IOCTL_STATUS:
2900 return snd_pcm_status_user(substream, arg, false);
2901 case SNDRV_PCM_IOCTL_STATUS_EXT:
2902 return snd_pcm_status_user(substream, arg, true);
2903 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2904 return snd_pcm_channel_info_user(substream, arg);
2905 case SNDRV_PCM_IOCTL_PREPARE:
2906 return snd_pcm_prepare(substream, file);
2907 case SNDRV_PCM_IOCTL_RESET:
2908 return snd_pcm_reset(substream);
2909 case SNDRV_PCM_IOCTL_START:
2910 return snd_pcm_start_lock_irq(substream);
2911 case SNDRV_PCM_IOCTL_LINK:
2912 return snd_pcm_link(substream, (int)(unsigned long) arg);
2913 case SNDRV_PCM_IOCTL_UNLINK:
2914 return snd_pcm_unlink(substream);
2915 case SNDRV_PCM_IOCTL_RESUME:
2916 return snd_pcm_resume(substream);
2917 case SNDRV_PCM_IOCTL_XRUN:
2918 return snd_pcm_xrun(substream);
2919 case SNDRV_PCM_IOCTL_HWSYNC:
2920 return snd_pcm_hwsync(substream);
2921 case SNDRV_PCM_IOCTL_DELAY:
2922 {
2923 snd_pcm_sframes_t delay;
2924 snd_pcm_sframes_t __user *res = arg;
2925 int err;
2926
2927 err = snd_pcm_delay(substream, &delay);
2928 if (err)
2929 return err;
2930 if (put_user(delay, res))
2931 return -EFAULT;
2932 return 0;
2933 }
2934 case SNDRV_PCM_IOCTL_SYNC_PTR:
2935 return snd_pcm_sync_ptr(substream, arg);
2936#ifdef CONFIG_SND_SUPPORT_OLD_API
2937 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2938 return snd_pcm_hw_refine_old_user(substream, arg);
2939 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2940 return snd_pcm_hw_params_old_user(substream, arg);
2941#endif
2942 case SNDRV_PCM_IOCTL_DRAIN:
2943 return snd_pcm_drain(substream, file);
2944 case SNDRV_PCM_IOCTL_DROP:
2945 return snd_pcm_drop(substream);
2946 case SNDRV_PCM_IOCTL_PAUSE:
2947 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2948 substream,
2949 (int)(unsigned long)arg);
2950 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2951 case SNDRV_PCM_IOCTL_READI_FRAMES:
2952 return snd_pcm_xferi_frames_ioctl(substream, arg);
2953 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2954 case SNDRV_PCM_IOCTL_READN_FRAMES:
2955 return snd_pcm_xfern_frames_ioctl(substream, arg);
2956 case SNDRV_PCM_IOCTL_REWIND:
2957 return snd_pcm_rewind_ioctl(substream, arg);
2958 case SNDRV_PCM_IOCTL_FORWARD:
2959 return snd_pcm_forward_ioctl(substream, arg);
2960 }
2961 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2962 return -ENOTTY;
2963}
2964
2965static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2966 unsigned long arg)
2967{
2968 struct snd_pcm_file *pcm_file;
2969
2970 pcm_file = file->private_data;
2971
2972 if (((cmd >> 8) & 0xff) != 'A')
2973 return -ENOTTY;
2974
2975 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2976 (void __user *)arg);
2977}
2978
2979/**
2980 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2981 * @substream: PCM substream
2982 * @cmd: IOCTL cmd
2983 * @arg: IOCTL argument
2984 *
2985 * The function is provided primarily for OSS layer and USB gadget drivers,
2986 * and it allows only the limited set of ioctls (hw_params, sw_params,
2987 * prepare, start, drain, drop, forward).
2988 */
2989int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2990 unsigned int cmd, void *arg)
2991{
2992 snd_pcm_uframes_t *frames = arg;
2993 snd_pcm_sframes_t result;
2994
2995 switch (cmd) {
2996 case SNDRV_PCM_IOCTL_FORWARD:
2997 {
2998 /* provided only for OSS; capture-only and no value returned */
2999 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3000 return -EINVAL;
3001 result = snd_pcm_capture_forward(substream, *frames);
3002 return result < 0 ? result : 0;
3003 }
3004 case SNDRV_PCM_IOCTL_HW_PARAMS:
3005 return snd_pcm_hw_params(substream, arg);
3006 case SNDRV_PCM_IOCTL_SW_PARAMS:
3007 return snd_pcm_sw_params(substream, arg);
3008 case SNDRV_PCM_IOCTL_PREPARE:
3009 return snd_pcm_prepare(substream, NULL);
3010 case SNDRV_PCM_IOCTL_START:
3011 return snd_pcm_start_lock_irq(substream);
3012 case SNDRV_PCM_IOCTL_DRAIN:
3013 return snd_pcm_drain(substream, NULL);
3014 case SNDRV_PCM_IOCTL_DROP:
3015 return snd_pcm_drop(substream);
3016 case SNDRV_PCM_IOCTL_DELAY:
3017 return snd_pcm_delay(substream, frames);
3018 default:
3019 return -EINVAL;
3020 }
3021}
3022EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3023
3024static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3025 loff_t * offset)
3026{
3027 struct snd_pcm_file *pcm_file;
3028 struct snd_pcm_substream *substream;
3029 struct snd_pcm_runtime *runtime;
3030 snd_pcm_sframes_t result;
3031
3032 pcm_file = file->private_data;
3033 substream = pcm_file->substream;
3034 if (PCM_RUNTIME_CHECK(substream))
3035 return -ENXIO;
3036 runtime = substream->runtime;
3037 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3038 return -EBADFD;
3039 if (!frame_aligned(runtime, count))
3040 return -EINVAL;
3041 count = bytes_to_frames(runtime, count);
3042 result = snd_pcm_lib_read(substream, buf, count);
3043 if (result > 0)
3044 result = frames_to_bytes(runtime, result);
3045 return result;
3046}
3047
3048static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3049 size_t count, loff_t * offset)
3050{
3051 struct snd_pcm_file *pcm_file;
3052 struct snd_pcm_substream *substream;
3053 struct snd_pcm_runtime *runtime;
3054 snd_pcm_sframes_t result;
3055
3056 pcm_file = file->private_data;
3057 substream = pcm_file->substream;
3058 if (PCM_RUNTIME_CHECK(substream))
3059 return -ENXIO;
3060 runtime = substream->runtime;
3061 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3062 return -EBADFD;
3063 if (!frame_aligned(runtime, count))
3064 return -EINVAL;
3065 count = bytes_to_frames(runtime, count);
3066 result = snd_pcm_lib_write(substream, buf, count);
3067 if (result > 0)
3068 result = frames_to_bytes(runtime, result);
3069 return result;
3070}
3071
3072static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3073{
3074 struct snd_pcm_file *pcm_file;
3075 struct snd_pcm_substream *substream;
3076 struct snd_pcm_runtime *runtime;
3077 snd_pcm_sframes_t result;
3078 unsigned long i;
3079 void __user **bufs;
3080 snd_pcm_uframes_t frames;
3081
3082 pcm_file = iocb->ki_filp->private_data;
3083 substream = pcm_file->substream;
3084 if (PCM_RUNTIME_CHECK(substream))
3085 return -ENXIO;
3086 runtime = substream->runtime;
3087 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3088 return -EBADFD;
3089 if (!iter_is_iovec(to))
3090 return -EINVAL;
3091 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3092 return -EINVAL;
3093 if (!frame_aligned(runtime, to->iov->iov_len))
3094 return -EINVAL;
3095 frames = bytes_to_samples(runtime, to->iov->iov_len);
3096 bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3097 if (bufs == NULL)
3098 return -ENOMEM;
3099 for (i = 0; i < to->nr_segs; ++i)
3100 bufs[i] = to->iov[i].iov_base;
3101 result = snd_pcm_lib_readv(substream, bufs, frames);
3102 if (result > 0)
3103 result = frames_to_bytes(runtime, result);
3104 kfree(bufs);
3105 return result;
3106}
3107
3108static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3109{
3110 struct snd_pcm_file *pcm_file;
3111 struct snd_pcm_substream *substream;
3112 struct snd_pcm_runtime *runtime;
3113 snd_pcm_sframes_t result;
3114 unsigned long i;
3115 void __user **bufs;
3116 snd_pcm_uframes_t frames;
3117
3118 pcm_file = iocb->ki_filp->private_data;
3119 substream = pcm_file->substream;
3120 if (PCM_RUNTIME_CHECK(substream))
3121 return -ENXIO;
3122 runtime = substream->runtime;
3123 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3124 return -EBADFD;
3125 if (!iter_is_iovec(from))
3126 return -EINVAL;
3127 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3128 !frame_aligned(runtime, from->iov->iov_len))
3129 return -EINVAL;
3130 frames = bytes_to_samples(runtime, from->iov->iov_len);
3131 bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3132 if (bufs == NULL)
3133 return -ENOMEM;
3134 for (i = 0; i < from->nr_segs; ++i)
3135 bufs[i] = from->iov[i].iov_base;
3136 result = snd_pcm_lib_writev(substream, bufs, frames);
3137 if (result > 0)
3138 result = frames_to_bytes(runtime, result);
3139 kfree(bufs);
3140 return result;
3141}
3142
3143static __poll_t snd_pcm_playback_poll(struct file *file, poll_table * wait)
3144{
3145 struct snd_pcm_file *pcm_file;
3146 struct snd_pcm_substream *substream;
3147 struct snd_pcm_runtime *runtime;
3148 __poll_t mask;
3149 snd_pcm_uframes_t avail;
3150
3151 pcm_file = file->private_data;
3152
3153 substream = pcm_file->substream;
3154 if (PCM_RUNTIME_CHECK(substream))
3155 return EPOLLOUT | EPOLLWRNORM | EPOLLERR;
3156 runtime = substream->runtime;
3157
3158 poll_wait(file, &runtime->sleep, wait);
3159
3160 snd_pcm_stream_lock_irq(substream);
3161 avail = snd_pcm_playback_avail(runtime);
3162 switch (runtime->status->state) {
3163 case SNDRV_PCM_STATE_RUNNING:
3164 case SNDRV_PCM_STATE_PREPARED:
3165 case SNDRV_PCM_STATE_PAUSED:
3166 if (avail >= runtime->control->avail_min) {
3167 mask = EPOLLOUT | EPOLLWRNORM;
3168 break;
3169 }
3170 /* Fall through */
3171 case SNDRV_PCM_STATE_DRAINING:
3172 mask = 0;
3173 break;
3174 default:
3175 mask = EPOLLOUT | EPOLLWRNORM | EPOLLERR;
3176 break;
3177 }
3178 snd_pcm_stream_unlock_irq(substream);
3179 return mask;
3180}
3181
3182static __poll_t snd_pcm_capture_poll(struct file *file, poll_table * wait)
3183{
3184 struct snd_pcm_file *pcm_file;
3185 struct snd_pcm_substream *substream;
3186 struct snd_pcm_runtime *runtime;
3187 __poll_t mask;
3188 snd_pcm_uframes_t avail;
3189
3190 pcm_file = file->private_data;
3191
3192 substream = pcm_file->substream;
3193 if (PCM_RUNTIME_CHECK(substream))
3194 return EPOLLIN | EPOLLRDNORM | EPOLLERR;
3195 runtime = substream->runtime;
3196
3197 poll_wait(file, &runtime->sleep, wait);
3198
3199 snd_pcm_stream_lock_irq(substream);
3200 avail = snd_pcm_capture_avail(runtime);
3201 switch (runtime->status->state) {
3202 case SNDRV_PCM_STATE_RUNNING:
3203 case SNDRV_PCM_STATE_PREPARED:
3204 case SNDRV_PCM_STATE_PAUSED:
3205 if (avail >= runtime->control->avail_min) {
3206 mask = EPOLLIN | EPOLLRDNORM;
3207 break;
3208 }
3209 mask = 0;
3210 break;
3211 case SNDRV_PCM_STATE_DRAINING:
3212 if (avail > 0) {
3213 mask = EPOLLIN | EPOLLRDNORM;
3214 break;
3215 }
3216 /* Fall through */
3217 default:
3218 mask = EPOLLIN | EPOLLRDNORM | EPOLLERR;
3219 break;
3220 }
3221 snd_pcm_stream_unlock_irq(substream);
3222 return mask;
3223}
3224
3225/*
3226 * mmap support
3227 */
3228
3229/*
3230 * Only on coherent architectures, we can mmap the status and the control records
3231 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3232 */
3233#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3234/*
3235 * mmap status record
3236 */
3237static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3238{
3239 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3240 struct snd_pcm_runtime *runtime;
3241
3242 if (substream == NULL)
3243 return VM_FAULT_SIGBUS;
3244 runtime = substream->runtime;
3245 vmf->page = virt_to_page(runtime->status);
3246 get_page(vmf->page);
3247 return 0;
3248}
3249
3250static const struct vm_operations_struct snd_pcm_vm_ops_status =
3251{
3252 .fault = snd_pcm_mmap_status_fault,
3253};
3254
3255static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3256 struct vm_area_struct *area)
3257{
3258 long size;
3259 if (!(area->vm_flags & VM_READ))
3260 return -EINVAL;
3261 size = area->vm_end - area->vm_start;
3262 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3263 return -EINVAL;
3264 area->vm_ops = &snd_pcm_vm_ops_status;
3265 area->vm_private_data = substream;
3266 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3267 return 0;
3268}
3269
3270/*
3271 * mmap control record
3272 */
3273static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3274{
3275 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3276 struct snd_pcm_runtime *runtime;
3277
3278 if (substream == NULL)
3279 return VM_FAULT_SIGBUS;
3280 runtime = substream->runtime;
3281 vmf->page = virt_to_page(runtime->control);
3282 get_page(vmf->page);
3283 return 0;
3284}
3285
3286static const struct vm_operations_struct snd_pcm_vm_ops_control =
3287{
3288 .fault = snd_pcm_mmap_control_fault,
3289};
3290
3291static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3292 struct vm_area_struct *area)
3293{
3294 long size;
3295 if (!(area->vm_flags & VM_READ))
3296 return -EINVAL;
3297 size = area->vm_end - area->vm_start;
3298 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3299 return -EINVAL;
3300 area->vm_ops = &snd_pcm_vm_ops_control;
3301 area->vm_private_data = substream;
3302 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3303 return 0;
3304}
3305
3306static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3307{
3308 if (pcm_file->no_compat_mmap)
3309 return false;
3310 /* See pcm_control_mmap_allowed() below.
3311 * Since older alsa-lib requires both status and control mmaps to be
3312 * coupled, we have to disable the status mmap for old alsa-lib, too.
3313 */
3314 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3315 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3316 return false;
3317 return true;
3318}
3319
3320static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3321{
3322 if (pcm_file->no_compat_mmap)
3323 return false;
3324 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3325 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3326 * thus it effectively assures the manual update of appl_ptr.
3327 */
3328 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3329 return false;
3330 return true;
3331}
3332
3333#else /* ! coherent mmap */
3334/*
3335 * don't support mmap for status and control records.
3336 */
3337#define pcm_status_mmap_allowed(pcm_file) false
3338#define pcm_control_mmap_allowed(pcm_file) false
3339
3340static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3341 struct vm_area_struct *area)
3342{
3343 return -ENXIO;
3344}
3345static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3346 struct vm_area_struct *area)
3347{
3348 return -ENXIO;
3349}
3350#endif /* coherent mmap */
3351
3352static inline struct page *
3353snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3354{
3355 void *vaddr = substream->runtime->dma_area + ofs;
3356 return virt_to_page(vaddr);
3357}
3358
3359/*
3360 * fault callback for mmapping a RAM page
3361 */
3362static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3363{
3364 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3365 struct snd_pcm_runtime *runtime;
3366 unsigned long offset;
3367 struct page * page;
3368 size_t dma_bytes;
3369
3370 if (substream == NULL)
3371 return VM_FAULT_SIGBUS;
3372 runtime = substream->runtime;
3373 offset = vmf->pgoff << PAGE_SHIFT;
3374 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3375 if (offset > dma_bytes - PAGE_SIZE)
3376 return VM_FAULT_SIGBUS;
3377 if (substream->ops->page)
3378 page = substream->ops->page(substream, offset);
3379 else
3380 page = snd_pcm_default_page_ops(substream, offset);
3381 if (!page)
3382 return VM_FAULT_SIGBUS;
3383 get_page(page);
3384 vmf->page = page;
3385 return 0;
3386}
3387
3388static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3389 .open = snd_pcm_mmap_data_open,
3390 .close = snd_pcm_mmap_data_close,
3391};
3392
3393static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3394 .open = snd_pcm_mmap_data_open,
3395 .close = snd_pcm_mmap_data_close,
3396 .fault = snd_pcm_mmap_data_fault,
3397};
3398
3399/*
3400 * mmap the DMA buffer on RAM
3401 */
3402
3403/**
3404 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3405 * @substream: PCM substream
3406 * @area: VMA
3407 *
3408 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3409 * this function is invoked implicitly.
3410 */
3411int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3412 struct vm_area_struct *area)
3413{
3414 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3415#ifdef CONFIG_GENERIC_ALLOCATOR
3416 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3417 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3418 return remap_pfn_range(area, area->vm_start,
3419 substream->dma_buffer.addr >> PAGE_SHIFT,
3420 area->vm_end - area->vm_start, area->vm_page_prot);
3421 }
3422#endif /* CONFIG_GENERIC_ALLOCATOR */
3423#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3424 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3425 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3426 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3427 area,
3428 substream->runtime->dma_area,
3429 substream->runtime->dma_addr,
3430 substream->runtime->dma_bytes);
3431#endif /* CONFIG_X86 */
3432 /* mmap with fault handler */
3433 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3434 return 0;
3435}
3436EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3437
3438/*
3439 * mmap the DMA buffer on I/O memory area
3440 */
3441#if SNDRV_PCM_INFO_MMAP_IOMEM
3442/**
3443 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3444 * @substream: PCM substream
3445 * @area: VMA
3446 *
3447 * When your hardware uses the iomapped pages as the hardware buffer and
3448 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3449 * is supposed to work only on limited architectures.
3450 */
3451int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3452 struct vm_area_struct *area)
3453{
3454 struct snd_pcm_runtime *runtime = substream->runtime;
3455
3456 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3457 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3458}
3459EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3460#endif /* SNDRV_PCM_INFO_MMAP */
3461
3462/*
3463 * mmap DMA buffer
3464 */
3465int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3466 struct vm_area_struct *area)
3467{
3468 struct snd_pcm_runtime *runtime;
3469 long size;
3470 unsigned long offset;
3471 size_t dma_bytes;
3472 int err;
3473
3474 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3475 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3476 return -EINVAL;
3477 } else {
3478 if (!(area->vm_flags & VM_READ))
3479 return -EINVAL;
3480 }
3481 runtime = substream->runtime;
3482 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3483 return -EBADFD;
3484 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3485 return -ENXIO;
3486 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3487 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3488 return -EINVAL;
3489 size = area->vm_end - area->vm_start;
3490 offset = area->vm_pgoff << PAGE_SHIFT;
3491 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3492 if ((size_t)size > dma_bytes)
3493 return -EINVAL;
3494 if (offset > dma_bytes - size)
3495 return -EINVAL;
3496
3497 area->vm_ops = &snd_pcm_vm_ops_data;
3498 area->vm_private_data = substream;
3499 if (substream->ops->mmap)
3500 err = substream->ops->mmap(substream, area);
3501 else
3502 err = snd_pcm_lib_default_mmap(substream, area);
3503 if (!err)
3504 atomic_inc(&substream->mmap_count);
3505 return err;
3506}
3507EXPORT_SYMBOL(snd_pcm_mmap_data);
3508
3509static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3510{
3511 struct snd_pcm_file * pcm_file;
3512 struct snd_pcm_substream *substream;
3513 unsigned long offset;
3514
3515 pcm_file = file->private_data;
3516 substream = pcm_file->substream;
3517 if (PCM_RUNTIME_CHECK(substream))
3518 return -ENXIO;
3519
3520 offset = area->vm_pgoff << PAGE_SHIFT;
3521 switch (offset) {
3522 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3523 if (!pcm_status_mmap_allowed(pcm_file))
3524 return -ENXIO;
3525 return snd_pcm_mmap_status(substream, file, area);
3526 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3527 if (!pcm_control_mmap_allowed(pcm_file))
3528 return -ENXIO;
3529 return snd_pcm_mmap_control(substream, file, area);
3530 default:
3531 return snd_pcm_mmap_data(substream, file, area);
3532 }
3533 return 0;
3534}
3535
3536static int snd_pcm_fasync(int fd, struct file * file, int on)
3537{
3538 struct snd_pcm_file * pcm_file;
3539 struct snd_pcm_substream *substream;
3540 struct snd_pcm_runtime *runtime;
3541
3542 pcm_file = file->private_data;
3543 substream = pcm_file->substream;
3544 if (PCM_RUNTIME_CHECK(substream))
3545 return -ENXIO;
3546 runtime = substream->runtime;
3547 return fasync_helper(fd, file, on, &runtime->fasync);
3548}
3549
3550/*
3551 * ioctl32 compat
3552 */
3553#ifdef CONFIG_COMPAT
3554#include "pcm_compat.c"
3555#else
3556#define snd_pcm_ioctl_compat NULL
3557#endif
3558
3559/*
3560 * To be removed helpers to keep binary compatibility
3561 */
3562
3563#ifdef CONFIG_SND_SUPPORT_OLD_API
3564#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3565#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3566
3567static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3568 struct snd_pcm_hw_params_old *oparams)
3569{
3570 unsigned int i;
3571
3572 memset(params, 0, sizeof(*params));
3573 params->flags = oparams->flags;
3574 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3575 params->masks[i].bits[0] = oparams->masks[i];
3576 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3577 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3578 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3579 params->info = oparams->info;
3580 params->msbits = oparams->msbits;
3581 params->rate_num = oparams->rate_num;
3582 params->rate_den = oparams->rate_den;
3583 params->fifo_size = oparams->fifo_size;
3584}
3585
3586static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3587 struct snd_pcm_hw_params *params)
3588{
3589 unsigned int i;
3590
3591 memset(oparams, 0, sizeof(*oparams));
3592 oparams->flags = params->flags;
3593 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3594 oparams->masks[i] = params->masks[i].bits[0];
3595 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3596 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3597 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3598 oparams->info = params->info;
3599 oparams->msbits = params->msbits;
3600 oparams->rate_num = params->rate_num;
3601 oparams->rate_den = params->rate_den;
3602 oparams->fifo_size = params->fifo_size;
3603}
3604
3605static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3606 struct snd_pcm_hw_params_old __user * _oparams)
3607{
3608 struct snd_pcm_hw_params *params;
3609 struct snd_pcm_hw_params_old *oparams = NULL;
3610 int err;
3611
3612 params = kmalloc(sizeof(*params), GFP_KERNEL);
3613 if (!params)
3614 return -ENOMEM;
3615
3616 oparams = memdup_user(_oparams, sizeof(*oparams));
3617 if (IS_ERR(oparams)) {
3618 err = PTR_ERR(oparams);
3619 goto out;
3620 }
3621 snd_pcm_hw_convert_from_old_params(params, oparams);
3622 err = snd_pcm_hw_refine(substream, params);
3623 if (err < 0)
3624 goto out_old;
3625
3626 err = fixup_unreferenced_params(substream, params);
3627 if (err < 0)
3628 goto out_old;
3629
3630 snd_pcm_hw_convert_to_old_params(oparams, params);
3631 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3632 err = -EFAULT;
3633out_old:
3634 kfree(oparams);
3635out:
3636 kfree(params);
3637 return err;
3638}
3639
3640static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3641 struct snd_pcm_hw_params_old __user * _oparams)
3642{
3643 struct snd_pcm_hw_params *params;
3644 struct snd_pcm_hw_params_old *oparams = NULL;
3645 int err;
3646
3647 params = kmalloc(sizeof(*params), GFP_KERNEL);
3648 if (!params)
3649 return -ENOMEM;
3650
3651 oparams = memdup_user(_oparams, sizeof(*oparams));
3652 if (IS_ERR(oparams)) {
3653 err = PTR_ERR(oparams);
3654 goto out;
3655 }
3656
3657 snd_pcm_hw_convert_from_old_params(params, oparams);
3658 err = snd_pcm_hw_params(substream, params);
3659 if (err < 0)
3660 goto out_old;
3661
3662 snd_pcm_hw_convert_to_old_params(oparams, params);
3663 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3664 err = -EFAULT;
3665out_old:
3666 kfree(oparams);
3667out:
3668 kfree(params);
3669 return err;
3670}
3671#endif /* CONFIG_SND_SUPPORT_OLD_API */
3672
3673#ifndef CONFIG_MMU
3674static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3675 unsigned long addr,
3676 unsigned long len,
3677 unsigned long pgoff,
3678 unsigned long flags)
3679{
3680 struct snd_pcm_file *pcm_file = file->private_data;
3681 struct snd_pcm_substream *substream = pcm_file->substream;
3682 struct snd_pcm_runtime *runtime = substream->runtime;
3683 unsigned long offset = pgoff << PAGE_SHIFT;
3684
3685 switch (offset) {
3686 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3687 return (unsigned long)runtime->status;
3688 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3689 return (unsigned long)runtime->control;
3690 default:
3691 return (unsigned long)runtime->dma_area + offset;
3692 }
3693}
3694#else
3695# define snd_pcm_get_unmapped_area NULL
3696#endif
3697
3698/*
3699 * Register section
3700 */
3701
3702const struct file_operations snd_pcm_f_ops[2] = {
3703 {
3704 .owner = THIS_MODULE,
3705 .write = snd_pcm_write,
3706 .write_iter = snd_pcm_writev,
3707 .open = snd_pcm_playback_open,
3708 .release = snd_pcm_release,
3709 .llseek = no_llseek,
3710 .poll = snd_pcm_playback_poll,
3711 .unlocked_ioctl = snd_pcm_ioctl,
3712 .compat_ioctl = snd_pcm_ioctl_compat,
3713 .mmap = snd_pcm_mmap,
3714 .fasync = snd_pcm_fasync,
3715 .get_unmapped_area = snd_pcm_get_unmapped_area,
3716 },
3717 {
3718 .owner = THIS_MODULE,
3719 .read = snd_pcm_read,
3720 .read_iter = snd_pcm_readv,
3721 .open = snd_pcm_capture_open,
3722 .release = snd_pcm_release,
3723 .llseek = no_llseek,
3724 .poll = snd_pcm_capture_poll,
3725 .unlocked_ioctl = snd_pcm_ioctl,
3726 .compat_ioctl = snd_pcm_ioctl_compat,
3727 .mmap = snd_pcm_mmap,
3728 .fasync = snd_pcm_fasync,
3729 .get_unmapped_area = snd_pcm_get_unmapped_area,
3730 }
3731};