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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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/compat.h>
8#include <linux/mm.h>
9#include <linux/module.h>
10#include <linux/file.h>
11#include <linux/slab.h>
12#include <linux/sched/signal.h>
13#include <linux/time.h>
14#include <linux/pm_qos.h>
15#include <linux/io.h>
16#include <linux/dma-mapping.h>
17#include <linux/vmalloc.h>
18#include <sound/core.h>
19#include <sound/control.h>
20#include <sound/info.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/timer.h>
24#include <sound/minors.h>
25#include <linux/uio.h>
26#include <linux/delay.h>
27
28#include "pcm_local.h"
29
30#ifdef CONFIG_SND_DEBUG
31#define CREATE_TRACE_POINTS
32#include "pcm_param_trace.h"
33#else
34#define trace_hw_mask_param_enabled() 0
35#define trace_hw_interval_param_enabled() 0
36#define trace_hw_mask_param(substream, type, index, prev, curr)
37#define trace_hw_interval_param(substream, type, index, prev, curr)
38#endif
39
40/*
41 * Compatibility
42 */
43
44struct snd_pcm_hw_params_old {
45 unsigned int flags;
46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
47 SNDRV_PCM_HW_PARAM_ACCESS + 1];
48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
50 unsigned int rmask;
51 unsigned int cmask;
52 unsigned int info;
53 unsigned int msbits;
54 unsigned int rate_num;
55 unsigned int rate_den;
56 snd_pcm_uframes_t fifo_size;
57 unsigned char reserved[64];
58};
59
60#ifdef CONFIG_SND_SUPPORT_OLD_API
61#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
62#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
63
64static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68#endif
69static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
70
71/*
72 *
73 */
74
75static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77void snd_pcm_group_init(struct snd_pcm_group *group)
78{
79 spin_lock_init(&group->lock);
80 mutex_init(&group->mutex);
81 INIT_LIST_HEAD(&group->substreams);
82 refcount_set(&group->refs, 1);
83}
84
85/* define group lock helpers */
86#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
87static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
88{ \
89 if (nonatomic) \
90 mutex_ ## mutex_action(&group->mutex); \
91 else \
92 spin_ ## action(&group->lock); \
93}
94
95DEFINE_PCM_GROUP_LOCK(lock, lock);
96DEFINE_PCM_GROUP_LOCK(unlock, unlock);
97DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
98DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
99
100/**
101 * snd_pcm_stream_lock - Lock the PCM stream
102 * @substream: PCM substream
103 *
104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
105 * flag of the given substream. This also takes the global link rw lock
106 * (or rw sem), too, for avoiding the race with linked streams.
107 */
108void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
109{
110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
111}
112EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
113
114/**
115 * snd_pcm_stream_unlock - Unlock the PCM stream
116 * @substream: PCM substream
117 *
118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
119 */
120void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
121{
122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
123}
124EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
125
126/**
127 * snd_pcm_stream_lock_irq - Lock the PCM stream
128 * @substream: PCM substream
129 *
130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
132 * as snd_pcm_stream_lock().
133 */
134void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
135{
136 snd_pcm_group_lock_irq(&substream->self_group,
137 substream->pcm->nonatomic);
138}
139EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
140
141static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
142{
143 struct snd_pcm_group *group = &substream->self_group;
144
145 if (substream->pcm->nonatomic)
146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
147 else
148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
149}
150
151/**
152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
153 * @substream: PCM substream
154 *
155 * This is a counter-part of snd_pcm_stream_lock_irq().
156 */
157void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
158{
159 snd_pcm_group_unlock_irq(&substream->self_group,
160 substream->pcm->nonatomic);
161}
162EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
163
164unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
165{
166 unsigned long flags = 0;
167 if (substream->pcm->nonatomic)
168 mutex_lock(&substream->self_group.mutex);
169 else
170 spin_lock_irqsave(&substream->self_group.lock, flags);
171 return flags;
172}
173EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
174
175unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
176{
177 unsigned long flags = 0;
178 if (substream->pcm->nonatomic)
179 mutex_lock_nested(&substream->self_group.mutex,
180 SINGLE_DEPTH_NESTING);
181 else
182 spin_lock_irqsave_nested(&substream->self_group.lock, flags,
183 SINGLE_DEPTH_NESTING);
184 return flags;
185}
186EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
187
188/**
189 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
190 * @substream: PCM substream
191 * @flags: irq flags
192 *
193 * This is a counter-part of snd_pcm_stream_lock_irqsave().
194 */
195void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
196 unsigned long flags)
197{
198 if (substream->pcm->nonatomic)
199 mutex_unlock(&substream->self_group.mutex);
200 else
201 spin_unlock_irqrestore(&substream->self_group.lock, flags);
202}
203EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
204
205/* Run PCM ioctl ops */
206static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
207 unsigned cmd, void *arg)
208{
209 if (substream->ops->ioctl)
210 return substream->ops->ioctl(substream, cmd, arg);
211 else
212 return snd_pcm_lib_ioctl(substream, cmd, arg);
213}
214
215int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
216{
217 struct snd_pcm *pcm = substream->pcm;
218 struct snd_pcm_str *pstr = substream->pstr;
219
220 memset(info, 0, sizeof(*info));
221 info->card = pcm->card->number;
222 info->device = pcm->device;
223 info->stream = substream->stream;
224 info->subdevice = substream->number;
225 strscpy(info->id, pcm->id, sizeof(info->id));
226 strscpy(info->name, pcm->name, sizeof(info->name));
227 info->dev_class = pcm->dev_class;
228 info->dev_subclass = pcm->dev_subclass;
229 info->subdevices_count = pstr->substream_count;
230 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
231 strscpy(info->subname, substream->name, sizeof(info->subname));
232
233 return 0;
234}
235
236int snd_pcm_info_user(struct snd_pcm_substream *substream,
237 struct snd_pcm_info __user * _info)
238{
239 struct snd_pcm_info *info;
240 int err;
241
242 info = kmalloc(sizeof(*info), GFP_KERNEL);
243 if (! info)
244 return -ENOMEM;
245 err = snd_pcm_info(substream, info);
246 if (err >= 0) {
247 if (copy_to_user(_info, info, sizeof(*info)))
248 err = -EFAULT;
249 }
250 kfree(info);
251 return err;
252}
253
254/* macro for simplified cast */
255#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
256
257static bool hw_support_mmap(struct snd_pcm_substream *substream)
258{
259 struct snd_dma_buffer *dmabuf;
260
261 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
262 return false;
263
264 if (substream->ops->mmap || substream->ops->page)
265 return true;
266
267 dmabuf = snd_pcm_get_dma_buf(substream);
268 if (!dmabuf)
269 dmabuf = &substream->dma_buffer;
270 switch (dmabuf->dev.type) {
271 case SNDRV_DMA_TYPE_UNKNOWN:
272 /* we can't know the device, so just assume that the driver does
273 * everything right
274 */
275 return true;
276 case SNDRV_DMA_TYPE_CONTINUOUS:
277 case SNDRV_DMA_TYPE_VMALLOC:
278 return true;
279 default:
280 return dma_can_mmap(dmabuf->dev.dev);
281 }
282}
283
284static int constrain_mask_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_mask *m;
290 unsigned int k;
291 struct snd_mask old_mask __maybe_unused;
292 int changed;
293
294 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
295 m = hw_param_mask(params, k);
296 if (snd_mask_empty(m))
297 return -EINVAL;
298
299 /* This parameter is not requested to change by a caller. */
300 if (!(params->rmask & PARAM_MASK_BIT(k)))
301 continue;
302
303 if (trace_hw_mask_param_enabled())
304 old_mask = *m;
305
306 changed = snd_mask_refine(m, constrs_mask(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_mask_param(substream, k, 0, &old_mask, m);
314 params->cmask |= PARAM_MASK_BIT(k);
315 }
316
317 return 0;
318}
319
320static int constrain_interval_params(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 struct snd_interval *i;
326 unsigned int k;
327 struct snd_interval old_interval __maybe_unused;
328 int changed;
329
330 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
331 i = hw_param_interval(params, k);
332 if (snd_interval_empty(i))
333 return -EINVAL;
334
335 /* This parameter is not requested to change by a caller. */
336 if (!(params->rmask & PARAM_MASK_BIT(k)))
337 continue;
338
339 if (trace_hw_interval_param_enabled())
340 old_interval = *i;
341
342 changed = snd_interval_refine(i, constrs_interval(constrs, k));
343 if (changed < 0)
344 return changed;
345 if (changed == 0)
346 continue;
347
348 /* Set corresponding flag so that the caller gets it. */
349 trace_hw_interval_param(substream, k, 0, &old_interval, i);
350 params->cmask |= PARAM_MASK_BIT(k);
351 }
352
353 return 0;
354}
355
356static int constrain_params_by_rules(struct snd_pcm_substream *substream,
357 struct snd_pcm_hw_params *params)
358{
359 struct snd_pcm_hw_constraints *constrs =
360 &substream->runtime->hw_constraints;
361 unsigned int k;
362 unsigned int *rstamps;
363 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
364 unsigned int stamp;
365 struct snd_pcm_hw_rule *r;
366 unsigned int d;
367 struct snd_mask old_mask __maybe_unused;
368 struct snd_interval old_interval __maybe_unused;
369 bool again;
370 int changed, err = 0;
371
372 /*
373 * Each application of rule has own sequence number.
374 *
375 * Each member of 'rstamps' array represents the sequence number of
376 * recent application of corresponding rule.
377 */
378 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
379 if (!rstamps)
380 return -ENOMEM;
381
382 /*
383 * Each member of 'vstamps' array represents the sequence number of
384 * recent application of rule in which corresponding parameters were
385 * changed.
386 *
387 * In initial state, elements corresponding to parameters requested by
388 * a caller is 1. For unrequested parameters, corresponding members
389 * have 0 so that the parameters are never changed anymore.
390 */
391 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
392 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
393
394 /* Due to the above design, actual sequence number starts at 2. */
395 stamp = 2;
396retry:
397 /* Apply all rules in order. */
398 again = false;
399 for (k = 0; k < constrs->rules_num; k++) {
400 r = &constrs->rules[k];
401
402 /*
403 * Check condition bits of this rule. When the rule has
404 * some condition bits, parameter without the bits is
405 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
406 * is an example of the condition bits.
407 */
408 if (r->cond && !(r->cond & params->flags))
409 continue;
410
411 /*
412 * The 'deps' array includes maximum four dependencies
413 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
414 * member of this array is a sentinel and should be
415 * negative value.
416 *
417 * This rule should be processed in this time when dependent
418 * parameters were changed at former applications of the other
419 * rules.
420 */
421 for (d = 0; r->deps[d] >= 0; d++) {
422 if (vstamps[r->deps[d]] > rstamps[k])
423 break;
424 }
425 if (r->deps[d] < 0)
426 continue;
427
428 if (trace_hw_mask_param_enabled()) {
429 if (hw_is_mask(r->var))
430 old_mask = *hw_param_mask(params, r->var);
431 }
432 if (trace_hw_interval_param_enabled()) {
433 if (hw_is_interval(r->var))
434 old_interval = *hw_param_interval(params, r->var);
435 }
436
437 changed = r->func(params, r);
438 if (changed < 0) {
439 err = changed;
440 goto out;
441 }
442
443 /*
444 * When the parameter is changed, notify it to the caller
445 * by corresponding returned bit, then preparing for next
446 * iteration.
447 */
448 if (changed && r->var >= 0) {
449 if (hw_is_mask(r->var)) {
450 trace_hw_mask_param(substream, r->var,
451 k + 1, &old_mask,
452 hw_param_mask(params, r->var));
453 }
454 if (hw_is_interval(r->var)) {
455 trace_hw_interval_param(substream, r->var,
456 k + 1, &old_interval,
457 hw_param_interval(params, r->var));
458 }
459
460 params->cmask |= PARAM_MASK_BIT(r->var);
461 vstamps[r->var] = stamp;
462 again = true;
463 }
464
465 rstamps[k] = stamp++;
466 }
467
468 /* Iterate to evaluate all rules till no parameters are changed. */
469 if (again)
470 goto retry;
471
472 out:
473 kfree(rstamps);
474 return err;
475}
476
477static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
478 struct snd_pcm_hw_params *params)
479{
480 const struct snd_interval *i;
481 const struct snd_mask *m;
482 int err;
483
484 if (!params->msbits) {
485 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
486 if (snd_interval_single(i))
487 params->msbits = snd_interval_value(i);
488 }
489
490 if (!params->rate_den) {
491 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
492 if (snd_interval_single(i)) {
493 params->rate_num = snd_interval_value(i);
494 params->rate_den = 1;
495 }
496 }
497
498 if (!params->fifo_size) {
499 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
500 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
501 if (snd_mask_single(m) && snd_interval_single(i)) {
502 err = snd_pcm_ops_ioctl(substream,
503 SNDRV_PCM_IOCTL1_FIFO_SIZE,
504 params);
505 if (err < 0)
506 return err;
507 }
508 }
509
510 if (!params->info) {
511 params->info = substream->runtime->hw.info;
512 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
513 SNDRV_PCM_INFO_DRAIN_TRIGGER);
514 if (!hw_support_mmap(substream))
515 params->info &= ~(SNDRV_PCM_INFO_MMAP |
516 SNDRV_PCM_INFO_MMAP_VALID);
517 }
518
519 return 0;
520}
521
522int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
523 struct snd_pcm_hw_params *params)
524{
525 int err;
526
527 params->info = 0;
528 params->fifo_size = 0;
529 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
530 params->msbits = 0;
531 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
532 params->rate_num = 0;
533 params->rate_den = 0;
534 }
535
536 err = constrain_mask_params(substream, params);
537 if (err < 0)
538 return err;
539
540 err = constrain_interval_params(substream, params);
541 if (err < 0)
542 return err;
543
544 err = constrain_params_by_rules(substream, params);
545 if (err < 0)
546 return err;
547
548 params->rmask = 0;
549
550 return 0;
551}
552EXPORT_SYMBOL(snd_pcm_hw_refine);
553
554static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
555 struct snd_pcm_hw_params __user * _params)
556{
557 struct snd_pcm_hw_params *params;
558 int err;
559
560 params = memdup_user(_params, sizeof(*params));
561 if (IS_ERR(params))
562 return PTR_ERR(params);
563
564 err = snd_pcm_hw_refine(substream, params);
565 if (err < 0)
566 goto end;
567
568 err = fixup_unreferenced_params(substream, params);
569 if (err < 0)
570 goto end;
571
572 if (copy_to_user(_params, params, sizeof(*params)))
573 err = -EFAULT;
574end:
575 kfree(params);
576 return err;
577}
578
579static int period_to_usecs(struct snd_pcm_runtime *runtime)
580{
581 int usecs;
582
583 if (! runtime->rate)
584 return -1; /* invalid */
585
586 /* take 75% of period time as the deadline */
587 usecs = (750000 / runtime->rate) * runtime->period_size;
588 usecs += ((750000 % runtime->rate) * runtime->period_size) /
589 runtime->rate;
590
591 return usecs;
592}
593
594static void snd_pcm_set_state(struct snd_pcm_substream *substream,
595 snd_pcm_state_t state)
596{
597 snd_pcm_stream_lock_irq(substream);
598 if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
599 __snd_pcm_set_state(substream->runtime, state);
600 snd_pcm_stream_unlock_irq(substream);
601}
602
603static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
604 int event)
605{
606#ifdef CONFIG_SND_PCM_TIMER
607 if (substream->timer)
608 snd_timer_notify(substream->timer, event,
609 &substream->runtime->trigger_tstamp);
610#endif
611}
612
613void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
614{
615 if (substream->runtime && substream->runtime->stop_operating) {
616 substream->runtime->stop_operating = false;
617 if (substream->ops && substream->ops->sync_stop)
618 substream->ops->sync_stop(substream);
619 else if (sync_irq && substream->pcm->card->sync_irq > 0)
620 synchronize_irq(substream->pcm->card->sync_irq);
621 }
622}
623
624/**
625 * snd_pcm_hw_params_choose - choose a configuration defined by @params
626 * @pcm: PCM instance
627 * @params: the hw_params instance
628 *
629 * Choose one configuration from configuration space defined by @params.
630 * The configuration chosen is that obtained fixing in this order:
631 * first access, first format, first subformat, min channels,
632 * min rate, min period time, max buffer size, min tick time
633 *
634 * Return: Zero if successful, or a negative error code on failure.
635 */
636static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
637 struct snd_pcm_hw_params *params)
638{
639 static const int vars[] = {
640 SNDRV_PCM_HW_PARAM_ACCESS,
641 SNDRV_PCM_HW_PARAM_FORMAT,
642 SNDRV_PCM_HW_PARAM_SUBFORMAT,
643 SNDRV_PCM_HW_PARAM_CHANNELS,
644 SNDRV_PCM_HW_PARAM_RATE,
645 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
646 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
647 SNDRV_PCM_HW_PARAM_TICK_TIME,
648 -1
649 };
650 const int *v;
651 struct snd_mask old_mask __maybe_unused;
652 struct snd_interval old_interval __maybe_unused;
653 int changed;
654
655 for (v = vars; *v != -1; v++) {
656 /* Keep old parameter to trace. */
657 if (trace_hw_mask_param_enabled()) {
658 if (hw_is_mask(*v))
659 old_mask = *hw_param_mask(params, *v);
660 }
661 if (trace_hw_interval_param_enabled()) {
662 if (hw_is_interval(*v))
663 old_interval = *hw_param_interval(params, *v);
664 }
665 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
666 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
667 else
668 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
669 if (changed < 0)
670 return changed;
671 if (changed == 0)
672 continue;
673
674 /* Trace the changed parameter. */
675 if (hw_is_mask(*v)) {
676 trace_hw_mask_param(pcm, *v, 0, &old_mask,
677 hw_param_mask(params, *v));
678 }
679 if (hw_is_interval(*v)) {
680 trace_hw_interval_param(pcm, *v, 0, &old_interval,
681 hw_param_interval(params, *v));
682 }
683 }
684
685 return 0;
686}
687
688/* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
689 * block the further r/w operations
690 */
691static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
692{
693 if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
694 return -EBUSY;
695 mutex_lock(&runtime->buffer_mutex);
696 return 0; /* keep buffer_mutex, unlocked by below */
697}
698
699/* release buffer_mutex and clear r/w access flag */
700static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
701{
702 mutex_unlock(&runtime->buffer_mutex);
703 atomic_inc(&runtime->buffer_accessing);
704}
705
706#if IS_ENABLED(CONFIG_SND_PCM_OSS)
707#define is_oss_stream(substream) ((substream)->oss.oss)
708#else
709#define is_oss_stream(substream) false
710#endif
711
712static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
713 struct snd_pcm_hw_params *params)
714{
715 struct snd_pcm_runtime *runtime;
716 int err, usecs;
717 unsigned int bits;
718 snd_pcm_uframes_t frames;
719
720 if (PCM_RUNTIME_CHECK(substream))
721 return -ENXIO;
722 runtime = substream->runtime;
723 err = snd_pcm_buffer_access_lock(runtime);
724 if (err < 0)
725 return err;
726 snd_pcm_stream_lock_irq(substream);
727 switch (runtime->state) {
728 case SNDRV_PCM_STATE_OPEN:
729 case SNDRV_PCM_STATE_SETUP:
730 case SNDRV_PCM_STATE_PREPARED:
731 if (!is_oss_stream(substream) &&
732 atomic_read(&substream->mmap_count))
733 err = -EBADFD;
734 break;
735 default:
736 err = -EBADFD;
737 break;
738 }
739 snd_pcm_stream_unlock_irq(substream);
740 if (err)
741 goto unlock;
742
743 snd_pcm_sync_stop(substream, true);
744
745 params->rmask = ~0U;
746 err = snd_pcm_hw_refine(substream, params);
747 if (err < 0)
748 goto _error;
749
750 err = snd_pcm_hw_params_choose(substream, params);
751 if (err < 0)
752 goto _error;
753
754 err = fixup_unreferenced_params(substream, params);
755 if (err < 0)
756 goto _error;
757
758 if (substream->managed_buffer_alloc) {
759 err = snd_pcm_lib_malloc_pages(substream,
760 params_buffer_bytes(params));
761 if (err < 0)
762 goto _error;
763 runtime->buffer_changed = err > 0;
764 }
765
766 if (substream->ops->hw_params != NULL) {
767 err = substream->ops->hw_params(substream, params);
768 if (err < 0)
769 goto _error;
770 }
771
772 runtime->access = params_access(params);
773 runtime->format = params_format(params);
774 runtime->subformat = params_subformat(params);
775 runtime->channels = params_channels(params);
776 runtime->rate = params_rate(params);
777 runtime->period_size = params_period_size(params);
778 runtime->periods = params_periods(params);
779 runtime->buffer_size = params_buffer_size(params);
780 runtime->info = params->info;
781 runtime->rate_num = params->rate_num;
782 runtime->rate_den = params->rate_den;
783 runtime->no_period_wakeup =
784 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
785 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
786
787 bits = snd_pcm_format_physical_width(runtime->format);
788 runtime->sample_bits = bits;
789 bits *= runtime->channels;
790 runtime->frame_bits = bits;
791 frames = 1;
792 while (bits % 8 != 0) {
793 bits *= 2;
794 frames *= 2;
795 }
796 runtime->byte_align = bits / 8;
797 runtime->min_align = frames;
798
799 /* Default sw params */
800 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
801 runtime->period_step = 1;
802 runtime->control->avail_min = runtime->period_size;
803 runtime->start_threshold = 1;
804 runtime->stop_threshold = runtime->buffer_size;
805 runtime->silence_threshold = 0;
806 runtime->silence_size = 0;
807 runtime->boundary = runtime->buffer_size;
808 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
809 runtime->boundary *= 2;
810
811 /* clear the buffer for avoiding possible kernel info leaks */
812 if (runtime->dma_area && !substream->ops->copy_user) {
813 size_t size = runtime->dma_bytes;
814
815 if (runtime->info & SNDRV_PCM_INFO_MMAP)
816 size = PAGE_ALIGN(size);
817 memset(runtime->dma_area, 0, size);
818 }
819
820 snd_pcm_timer_resolution_change(substream);
821 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
822
823 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
824 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
825 usecs = period_to_usecs(runtime);
826 if (usecs >= 0)
827 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
828 usecs);
829 err = 0;
830 _error:
831 if (err) {
832 /* hardware might be unusable from this time,
833 * so we force application to retry to set
834 * the correct hardware parameter settings
835 */
836 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
837 if (substream->ops->hw_free != NULL)
838 substream->ops->hw_free(substream);
839 if (substream->managed_buffer_alloc)
840 snd_pcm_lib_free_pages(substream);
841 }
842 unlock:
843 snd_pcm_buffer_access_unlock(runtime);
844 return err;
845}
846
847static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
848 struct snd_pcm_hw_params __user * _params)
849{
850 struct snd_pcm_hw_params *params;
851 int err;
852
853 params = memdup_user(_params, sizeof(*params));
854 if (IS_ERR(params))
855 return PTR_ERR(params);
856
857 err = snd_pcm_hw_params(substream, params);
858 if (err < 0)
859 goto end;
860
861 if (copy_to_user(_params, params, sizeof(*params)))
862 err = -EFAULT;
863end:
864 kfree(params);
865 return err;
866}
867
868static int do_hw_free(struct snd_pcm_substream *substream)
869{
870 int result = 0;
871
872 snd_pcm_sync_stop(substream, true);
873 if (substream->ops->hw_free)
874 result = substream->ops->hw_free(substream);
875 if (substream->managed_buffer_alloc)
876 snd_pcm_lib_free_pages(substream);
877 return result;
878}
879
880static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
881{
882 struct snd_pcm_runtime *runtime;
883 int result = 0;
884
885 if (PCM_RUNTIME_CHECK(substream))
886 return -ENXIO;
887 runtime = substream->runtime;
888 result = snd_pcm_buffer_access_lock(runtime);
889 if (result < 0)
890 return result;
891 snd_pcm_stream_lock_irq(substream);
892 switch (runtime->state) {
893 case SNDRV_PCM_STATE_SETUP:
894 case SNDRV_PCM_STATE_PREPARED:
895 if (atomic_read(&substream->mmap_count))
896 result = -EBADFD;
897 break;
898 default:
899 result = -EBADFD;
900 break;
901 }
902 snd_pcm_stream_unlock_irq(substream);
903 if (result)
904 goto unlock;
905 result = do_hw_free(substream);
906 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
907 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
908 unlock:
909 snd_pcm_buffer_access_unlock(runtime);
910 return result;
911}
912
913static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
914 struct snd_pcm_sw_params *params)
915{
916 struct snd_pcm_runtime *runtime;
917 int err;
918
919 if (PCM_RUNTIME_CHECK(substream))
920 return -ENXIO;
921 runtime = substream->runtime;
922 snd_pcm_stream_lock_irq(substream);
923 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
924 snd_pcm_stream_unlock_irq(substream);
925 return -EBADFD;
926 }
927 snd_pcm_stream_unlock_irq(substream);
928
929 if (params->tstamp_mode < 0 ||
930 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
931 return -EINVAL;
932 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
933 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
934 return -EINVAL;
935 if (params->avail_min == 0)
936 return -EINVAL;
937 if (params->silence_size >= runtime->boundary) {
938 if (params->silence_threshold != 0)
939 return -EINVAL;
940 } else {
941 if (params->silence_size > params->silence_threshold)
942 return -EINVAL;
943 if (params->silence_threshold > runtime->buffer_size)
944 return -EINVAL;
945 }
946 err = 0;
947 snd_pcm_stream_lock_irq(substream);
948 runtime->tstamp_mode = params->tstamp_mode;
949 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
950 runtime->tstamp_type = params->tstamp_type;
951 runtime->period_step = params->period_step;
952 runtime->control->avail_min = params->avail_min;
953 runtime->start_threshold = params->start_threshold;
954 runtime->stop_threshold = params->stop_threshold;
955 runtime->silence_threshold = params->silence_threshold;
956 runtime->silence_size = params->silence_size;
957 params->boundary = runtime->boundary;
958 if (snd_pcm_running(substream)) {
959 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
960 runtime->silence_size > 0)
961 snd_pcm_playback_silence(substream, ULONG_MAX);
962 err = snd_pcm_update_state(substream, runtime);
963 }
964 snd_pcm_stream_unlock_irq(substream);
965 return err;
966}
967
968static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
969 struct snd_pcm_sw_params __user * _params)
970{
971 struct snd_pcm_sw_params params;
972 int err;
973 if (copy_from_user(¶ms, _params, sizeof(params)))
974 return -EFAULT;
975 err = snd_pcm_sw_params(substream, ¶ms);
976 if (copy_to_user(_params, ¶ms, sizeof(params)))
977 return -EFAULT;
978 return err;
979}
980
981static inline snd_pcm_uframes_t
982snd_pcm_calc_delay(struct snd_pcm_substream *substream)
983{
984 snd_pcm_uframes_t delay;
985
986 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
987 delay = snd_pcm_playback_hw_avail(substream->runtime);
988 else
989 delay = snd_pcm_capture_avail(substream->runtime);
990 return delay + substream->runtime->delay;
991}
992
993int snd_pcm_status64(struct snd_pcm_substream *substream,
994 struct snd_pcm_status64 *status)
995{
996 struct snd_pcm_runtime *runtime = substream->runtime;
997
998 snd_pcm_stream_lock_irq(substream);
999
1000 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1001 &runtime->audio_tstamp_config);
1002
1003 /* backwards compatible behavior */
1004 if (runtime->audio_tstamp_config.type_requested ==
1005 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1006 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1007 runtime->audio_tstamp_config.type_requested =
1008 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1009 else
1010 runtime->audio_tstamp_config.type_requested =
1011 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1012 runtime->audio_tstamp_report.valid = 0;
1013 } else
1014 runtime->audio_tstamp_report.valid = 1;
1015
1016 status->state = runtime->state;
1017 status->suspended_state = runtime->suspended_state;
1018 if (status->state == SNDRV_PCM_STATE_OPEN)
1019 goto _end;
1020 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1021 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1022 if (snd_pcm_running(substream)) {
1023 snd_pcm_update_hw_ptr(substream);
1024 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1025 status->tstamp_sec = runtime->status->tstamp.tv_sec;
1026 status->tstamp_nsec =
1027 runtime->status->tstamp.tv_nsec;
1028 status->driver_tstamp_sec =
1029 runtime->driver_tstamp.tv_sec;
1030 status->driver_tstamp_nsec =
1031 runtime->driver_tstamp.tv_nsec;
1032 status->audio_tstamp_sec =
1033 runtime->status->audio_tstamp.tv_sec;
1034 status->audio_tstamp_nsec =
1035 runtime->status->audio_tstamp.tv_nsec;
1036 if (runtime->audio_tstamp_report.valid == 1)
1037 /* backwards compatibility, no report provided in COMPAT mode */
1038 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1039 &status->audio_tstamp_accuracy,
1040 &runtime->audio_tstamp_report);
1041
1042 goto _tstamp_end;
1043 }
1044 } else {
1045 /* get tstamp only in fallback mode and only if enabled */
1046 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1047 struct timespec64 tstamp;
1048
1049 snd_pcm_gettime(runtime, &tstamp);
1050 status->tstamp_sec = tstamp.tv_sec;
1051 status->tstamp_nsec = tstamp.tv_nsec;
1052 }
1053 }
1054 _tstamp_end:
1055 status->appl_ptr = runtime->control->appl_ptr;
1056 status->hw_ptr = runtime->status->hw_ptr;
1057 status->avail = snd_pcm_avail(substream);
1058 status->delay = snd_pcm_running(substream) ?
1059 snd_pcm_calc_delay(substream) : 0;
1060 status->avail_max = runtime->avail_max;
1061 status->overrange = runtime->overrange;
1062 runtime->avail_max = 0;
1063 runtime->overrange = 0;
1064 _end:
1065 snd_pcm_stream_unlock_irq(substream);
1066 return 0;
1067}
1068
1069static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1070 struct snd_pcm_status64 __user * _status,
1071 bool ext)
1072{
1073 struct snd_pcm_status64 status;
1074 int res;
1075
1076 memset(&status, 0, sizeof(status));
1077 /*
1078 * with extension, parameters are read/write,
1079 * get audio_tstamp_data from user,
1080 * ignore rest of status structure
1081 */
1082 if (ext && get_user(status.audio_tstamp_data,
1083 (u32 __user *)(&_status->audio_tstamp_data)))
1084 return -EFAULT;
1085 res = snd_pcm_status64(substream, &status);
1086 if (res < 0)
1087 return res;
1088 if (copy_to_user(_status, &status, sizeof(status)))
1089 return -EFAULT;
1090 return 0;
1091}
1092
1093static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1094 struct snd_pcm_status32 __user * _status,
1095 bool ext)
1096{
1097 struct snd_pcm_status64 status64;
1098 struct snd_pcm_status32 status32;
1099 int res;
1100
1101 memset(&status64, 0, sizeof(status64));
1102 memset(&status32, 0, sizeof(status32));
1103 /*
1104 * with extension, parameters are read/write,
1105 * get audio_tstamp_data from user,
1106 * ignore rest of status structure
1107 */
1108 if (ext && get_user(status64.audio_tstamp_data,
1109 (u32 __user *)(&_status->audio_tstamp_data)))
1110 return -EFAULT;
1111 res = snd_pcm_status64(substream, &status64);
1112 if (res < 0)
1113 return res;
1114
1115 status32 = (struct snd_pcm_status32) {
1116 .state = status64.state,
1117 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1118 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1119 .tstamp_sec = status64.tstamp_sec,
1120 .tstamp_nsec = status64.tstamp_nsec,
1121 .appl_ptr = status64.appl_ptr,
1122 .hw_ptr = status64.hw_ptr,
1123 .delay = status64.delay,
1124 .avail = status64.avail,
1125 .avail_max = status64.avail_max,
1126 .overrange = status64.overrange,
1127 .suspended_state = status64.suspended_state,
1128 .audio_tstamp_data = status64.audio_tstamp_data,
1129 .audio_tstamp_sec = status64.audio_tstamp_sec,
1130 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1131 .driver_tstamp_sec = status64.audio_tstamp_sec,
1132 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1133 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1134 };
1135
1136 if (copy_to_user(_status, &status32, sizeof(status32)))
1137 return -EFAULT;
1138
1139 return 0;
1140}
1141
1142static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1143 struct snd_pcm_channel_info * info)
1144{
1145 struct snd_pcm_runtime *runtime;
1146 unsigned int channel;
1147
1148 channel = info->channel;
1149 runtime = substream->runtime;
1150 snd_pcm_stream_lock_irq(substream);
1151 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
1152 snd_pcm_stream_unlock_irq(substream);
1153 return -EBADFD;
1154 }
1155 snd_pcm_stream_unlock_irq(substream);
1156 if (channel >= runtime->channels)
1157 return -EINVAL;
1158 memset(info, 0, sizeof(*info));
1159 info->channel = channel;
1160 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1161}
1162
1163static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1164 struct snd_pcm_channel_info __user * _info)
1165{
1166 struct snd_pcm_channel_info info;
1167 int res;
1168
1169 if (copy_from_user(&info, _info, sizeof(info)))
1170 return -EFAULT;
1171 res = snd_pcm_channel_info(substream, &info);
1172 if (res < 0)
1173 return res;
1174 if (copy_to_user(_info, &info, sizeof(info)))
1175 return -EFAULT;
1176 return 0;
1177}
1178
1179static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1180{
1181 struct snd_pcm_runtime *runtime = substream->runtime;
1182 if (runtime->trigger_master == NULL)
1183 return;
1184 if (runtime->trigger_master == substream) {
1185 if (!runtime->trigger_tstamp_latched)
1186 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1187 } else {
1188 snd_pcm_trigger_tstamp(runtime->trigger_master);
1189 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1190 }
1191 runtime->trigger_master = NULL;
1192}
1193
1194#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
1195
1196struct action_ops {
1197 int (*pre_action)(struct snd_pcm_substream *substream,
1198 snd_pcm_state_t state);
1199 int (*do_action)(struct snd_pcm_substream *substream,
1200 snd_pcm_state_t state);
1201 void (*undo_action)(struct snd_pcm_substream *substream,
1202 snd_pcm_state_t state);
1203 void (*post_action)(struct snd_pcm_substream *substream,
1204 snd_pcm_state_t state);
1205};
1206
1207/*
1208 * this functions is core for handling of linked stream
1209 * Note: the stream state might be changed also on failure
1210 * Note2: call with calling stream lock + link lock
1211 */
1212static int snd_pcm_action_group(const struct action_ops *ops,
1213 struct snd_pcm_substream *substream,
1214 snd_pcm_state_t state,
1215 bool stream_lock)
1216{
1217 struct snd_pcm_substream *s = NULL;
1218 struct snd_pcm_substream *s1;
1219 int res = 0, depth = 1;
1220
1221 snd_pcm_group_for_each_entry(s, substream) {
1222 if (s != substream) {
1223 if (!stream_lock)
1224 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1225 else if (s->pcm->nonatomic)
1226 mutex_lock_nested(&s->self_group.mutex, depth);
1227 else
1228 spin_lock_nested(&s->self_group.lock, depth);
1229 depth++;
1230 }
1231 res = ops->pre_action(s, state);
1232 if (res < 0)
1233 goto _unlock;
1234 }
1235 snd_pcm_group_for_each_entry(s, substream) {
1236 res = ops->do_action(s, state);
1237 if (res < 0) {
1238 if (ops->undo_action) {
1239 snd_pcm_group_for_each_entry(s1, substream) {
1240 if (s1 == s) /* failed stream */
1241 break;
1242 ops->undo_action(s1, state);
1243 }
1244 }
1245 s = NULL; /* unlock all */
1246 goto _unlock;
1247 }
1248 }
1249 snd_pcm_group_for_each_entry(s, substream) {
1250 ops->post_action(s, state);
1251 }
1252 _unlock:
1253 /* unlock streams */
1254 snd_pcm_group_for_each_entry(s1, substream) {
1255 if (s1 != substream) {
1256 if (!stream_lock)
1257 mutex_unlock(&s1->runtime->buffer_mutex);
1258 else if (s1->pcm->nonatomic)
1259 mutex_unlock(&s1->self_group.mutex);
1260 else
1261 spin_unlock(&s1->self_group.lock);
1262 }
1263 if (s1 == s) /* end */
1264 break;
1265 }
1266 return res;
1267}
1268
1269/*
1270 * Note: call with stream lock
1271 */
1272static int snd_pcm_action_single(const struct action_ops *ops,
1273 struct snd_pcm_substream *substream,
1274 snd_pcm_state_t state)
1275{
1276 int res;
1277
1278 res = ops->pre_action(substream, state);
1279 if (res < 0)
1280 return res;
1281 res = ops->do_action(substream, state);
1282 if (res == 0)
1283 ops->post_action(substream, state);
1284 else if (ops->undo_action)
1285 ops->undo_action(substream, state);
1286 return res;
1287}
1288
1289static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1290 struct snd_pcm_group *new_group)
1291{
1292 substream->group = new_group;
1293 list_move(&substream->link_list, &new_group->substreams);
1294}
1295
1296/*
1297 * Unref and unlock the group, but keep the stream lock;
1298 * when the group becomes empty and no longer referred, destroy itself
1299 */
1300static void snd_pcm_group_unref(struct snd_pcm_group *group,
1301 struct snd_pcm_substream *substream)
1302{
1303 bool do_free;
1304
1305 if (!group)
1306 return;
1307 do_free = refcount_dec_and_test(&group->refs);
1308 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1309 if (do_free)
1310 kfree(group);
1311}
1312
1313/*
1314 * Lock the group inside a stream lock and reference it;
1315 * return the locked group object, or NULL if not linked
1316 */
1317static struct snd_pcm_group *
1318snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1319{
1320 bool nonatomic = substream->pcm->nonatomic;
1321 struct snd_pcm_group *group;
1322 bool trylock;
1323
1324 for (;;) {
1325 if (!snd_pcm_stream_linked(substream))
1326 return NULL;
1327 group = substream->group;
1328 /* block freeing the group object */
1329 refcount_inc(&group->refs);
1330
1331 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1332 spin_trylock(&group->lock);
1333 if (trylock)
1334 break; /* OK */
1335
1336 /* re-lock for avoiding ABBA deadlock */
1337 snd_pcm_stream_unlock(substream);
1338 snd_pcm_group_lock(group, nonatomic);
1339 snd_pcm_stream_lock(substream);
1340
1341 /* check the group again; the above opens a small race window */
1342 if (substream->group == group)
1343 break; /* OK */
1344 /* group changed, try again */
1345 snd_pcm_group_unref(group, substream);
1346 }
1347 return group;
1348}
1349
1350/*
1351 * Note: call with stream lock
1352 */
1353static int snd_pcm_action(const struct action_ops *ops,
1354 struct snd_pcm_substream *substream,
1355 snd_pcm_state_t state)
1356{
1357 struct snd_pcm_group *group;
1358 int res;
1359
1360 group = snd_pcm_stream_group_ref(substream);
1361 if (group)
1362 res = snd_pcm_action_group(ops, substream, state, true);
1363 else
1364 res = snd_pcm_action_single(ops, substream, state);
1365 snd_pcm_group_unref(group, substream);
1366 return res;
1367}
1368
1369/*
1370 * Note: don't use any locks before
1371 */
1372static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1373 struct snd_pcm_substream *substream,
1374 snd_pcm_state_t state)
1375{
1376 int res;
1377
1378 snd_pcm_stream_lock_irq(substream);
1379 res = snd_pcm_action(ops, substream, state);
1380 snd_pcm_stream_unlock_irq(substream);
1381 return res;
1382}
1383
1384/*
1385 */
1386static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1387 struct snd_pcm_substream *substream,
1388 snd_pcm_state_t state)
1389{
1390 int res;
1391
1392 /* Guarantee the group members won't change during non-atomic action */
1393 down_read(&snd_pcm_link_rwsem);
1394 res = snd_pcm_buffer_access_lock(substream->runtime);
1395 if (res < 0)
1396 goto unlock;
1397 if (snd_pcm_stream_linked(substream))
1398 res = snd_pcm_action_group(ops, substream, state, false);
1399 else
1400 res = snd_pcm_action_single(ops, substream, state);
1401 snd_pcm_buffer_access_unlock(substream->runtime);
1402 unlock:
1403 up_read(&snd_pcm_link_rwsem);
1404 return res;
1405}
1406
1407/*
1408 * start callbacks
1409 */
1410static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1411 snd_pcm_state_t state)
1412{
1413 struct snd_pcm_runtime *runtime = substream->runtime;
1414 if (runtime->state != SNDRV_PCM_STATE_PREPARED)
1415 return -EBADFD;
1416 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1417 !snd_pcm_playback_data(substream))
1418 return -EPIPE;
1419 runtime->trigger_tstamp_latched = false;
1420 runtime->trigger_master = substream;
1421 return 0;
1422}
1423
1424static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1425 snd_pcm_state_t state)
1426{
1427 int err;
1428
1429 if (substream->runtime->trigger_master != substream)
1430 return 0;
1431 err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1432 /* XRUN happened during the start */
1433 if (err == -EPIPE)
1434 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN);
1435 return err;
1436}
1437
1438static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1439 snd_pcm_state_t state)
1440{
1441 if (substream->runtime->trigger_master == substream) {
1442 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1443 substream->runtime->stop_operating = true;
1444 }
1445}
1446
1447static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1448 snd_pcm_state_t state)
1449{
1450 struct snd_pcm_runtime *runtime = substream->runtime;
1451 snd_pcm_trigger_tstamp(substream);
1452 runtime->hw_ptr_jiffies = jiffies;
1453 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1454 runtime->rate;
1455 __snd_pcm_set_state(runtime, state);
1456 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1457 runtime->silence_size > 0)
1458 snd_pcm_playback_silence(substream, ULONG_MAX);
1459 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1460}
1461
1462static const struct action_ops snd_pcm_action_start = {
1463 .pre_action = snd_pcm_pre_start,
1464 .do_action = snd_pcm_do_start,
1465 .undo_action = snd_pcm_undo_start,
1466 .post_action = snd_pcm_post_start
1467};
1468
1469/**
1470 * snd_pcm_start - start all linked streams
1471 * @substream: the PCM substream instance
1472 *
1473 * Return: Zero if successful, or a negative error code.
1474 * The stream lock must be acquired before calling this function.
1475 */
1476int snd_pcm_start(struct snd_pcm_substream *substream)
1477{
1478 return snd_pcm_action(&snd_pcm_action_start, substream,
1479 SNDRV_PCM_STATE_RUNNING);
1480}
1481
1482/* take the stream lock and start the streams */
1483static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1484{
1485 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1486 SNDRV_PCM_STATE_RUNNING);
1487}
1488
1489/*
1490 * stop callbacks
1491 */
1492static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1493 snd_pcm_state_t state)
1494{
1495 struct snd_pcm_runtime *runtime = substream->runtime;
1496 if (runtime->state == SNDRV_PCM_STATE_OPEN)
1497 return -EBADFD;
1498 runtime->trigger_master = substream;
1499 return 0;
1500}
1501
1502static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1503 snd_pcm_state_t state)
1504{
1505 if (substream->runtime->trigger_master == substream &&
1506 snd_pcm_running(substream)) {
1507 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1508 substream->runtime->stop_operating = true;
1509 }
1510 return 0; /* unconditionally stop all substreams */
1511}
1512
1513static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1514 snd_pcm_state_t state)
1515{
1516 struct snd_pcm_runtime *runtime = substream->runtime;
1517 if (runtime->state != state) {
1518 snd_pcm_trigger_tstamp(substream);
1519 __snd_pcm_set_state(runtime, state);
1520 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1521 }
1522 wake_up(&runtime->sleep);
1523 wake_up(&runtime->tsleep);
1524}
1525
1526static const struct action_ops snd_pcm_action_stop = {
1527 .pre_action = snd_pcm_pre_stop,
1528 .do_action = snd_pcm_do_stop,
1529 .post_action = snd_pcm_post_stop
1530};
1531
1532/**
1533 * snd_pcm_stop - try to stop all running streams in the substream group
1534 * @substream: the PCM substream instance
1535 * @state: PCM state after stopping the stream
1536 *
1537 * The state of each stream is then changed to the given state unconditionally.
1538 *
1539 * Return: Zero if successful, or a negative error code.
1540 */
1541int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1542{
1543 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1544}
1545EXPORT_SYMBOL(snd_pcm_stop);
1546
1547/**
1548 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1549 * @substream: the PCM substream
1550 *
1551 * After stopping, the state is changed to SETUP.
1552 * Unlike snd_pcm_stop(), this affects only the given stream.
1553 *
1554 * Return: Zero if successful, or a negative error code.
1555 */
1556int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1557{
1558 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1559 SNDRV_PCM_STATE_SETUP);
1560}
1561
1562/**
1563 * snd_pcm_stop_xrun - stop the running streams as XRUN
1564 * @substream: the PCM substream instance
1565 *
1566 * This stops the given running substream (and all linked substreams) as XRUN.
1567 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1568 *
1569 * Return: Zero if successful, or a negative error code.
1570 */
1571int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1572{
1573 unsigned long flags;
1574
1575 snd_pcm_stream_lock_irqsave(substream, flags);
1576 if (substream->runtime && snd_pcm_running(substream))
1577 __snd_pcm_xrun(substream);
1578 snd_pcm_stream_unlock_irqrestore(substream, flags);
1579 return 0;
1580}
1581EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1582
1583/*
1584 * pause callbacks: pass boolean (to start pause or resume) as state argument
1585 */
1586#define pause_pushed(state) (__force bool)(state)
1587
1588static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1589 snd_pcm_state_t state)
1590{
1591 struct snd_pcm_runtime *runtime = substream->runtime;
1592 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1593 return -ENOSYS;
1594 if (pause_pushed(state)) {
1595 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1596 return -EBADFD;
1597 } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1598 return -EBADFD;
1599 runtime->trigger_master = substream;
1600 return 0;
1601}
1602
1603static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1604 snd_pcm_state_t state)
1605{
1606 if (substream->runtime->trigger_master != substream)
1607 return 0;
1608 /* some drivers might use hw_ptr to recover from the pause -
1609 update the hw_ptr now */
1610 if (pause_pushed(state))
1611 snd_pcm_update_hw_ptr(substream);
1612 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1613 * a delta between the current jiffies, this gives a large enough
1614 * delta, effectively to skip the check once.
1615 */
1616 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1617 return substream->ops->trigger(substream,
1618 pause_pushed(state) ?
1619 SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1620 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1621}
1622
1623static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1624 snd_pcm_state_t state)
1625{
1626 if (substream->runtime->trigger_master == substream)
1627 substream->ops->trigger(substream,
1628 pause_pushed(state) ?
1629 SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1630 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1631}
1632
1633static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1634 snd_pcm_state_t state)
1635{
1636 struct snd_pcm_runtime *runtime = substream->runtime;
1637 snd_pcm_trigger_tstamp(substream);
1638 if (pause_pushed(state)) {
1639 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1640 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1641 wake_up(&runtime->sleep);
1642 wake_up(&runtime->tsleep);
1643 } else {
1644 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1645 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1646 }
1647}
1648
1649static const struct action_ops snd_pcm_action_pause = {
1650 .pre_action = snd_pcm_pre_pause,
1651 .do_action = snd_pcm_do_pause,
1652 .undo_action = snd_pcm_undo_pause,
1653 .post_action = snd_pcm_post_pause
1654};
1655
1656/*
1657 * Push/release the pause for all linked streams.
1658 */
1659static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1660{
1661 return snd_pcm_action(&snd_pcm_action_pause, substream,
1662 (__force snd_pcm_state_t)push);
1663}
1664
1665static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1666 bool push)
1667{
1668 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1669 (__force snd_pcm_state_t)push);
1670}
1671
1672#ifdef CONFIG_PM
1673/* suspend callback: state argument ignored */
1674
1675static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1676 snd_pcm_state_t state)
1677{
1678 struct snd_pcm_runtime *runtime = substream->runtime;
1679 switch (runtime->state) {
1680 case SNDRV_PCM_STATE_SUSPENDED:
1681 return -EBUSY;
1682 /* unresumable PCM state; return -EBUSY for skipping suspend */
1683 case SNDRV_PCM_STATE_OPEN:
1684 case SNDRV_PCM_STATE_SETUP:
1685 case SNDRV_PCM_STATE_DISCONNECTED:
1686 return -EBUSY;
1687 }
1688 runtime->trigger_master = substream;
1689 return 0;
1690}
1691
1692static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1693 snd_pcm_state_t state)
1694{
1695 struct snd_pcm_runtime *runtime = substream->runtime;
1696 if (runtime->trigger_master != substream)
1697 return 0;
1698 if (! snd_pcm_running(substream))
1699 return 0;
1700 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1701 runtime->stop_operating = true;
1702 return 0; /* suspend unconditionally */
1703}
1704
1705static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1706 snd_pcm_state_t state)
1707{
1708 struct snd_pcm_runtime *runtime = substream->runtime;
1709 snd_pcm_trigger_tstamp(substream);
1710 runtime->suspended_state = runtime->state;
1711 runtime->status->suspended_state = runtime->suspended_state;
1712 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1713 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1714 wake_up(&runtime->sleep);
1715 wake_up(&runtime->tsleep);
1716}
1717
1718static const struct action_ops snd_pcm_action_suspend = {
1719 .pre_action = snd_pcm_pre_suspend,
1720 .do_action = snd_pcm_do_suspend,
1721 .post_action = snd_pcm_post_suspend
1722};
1723
1724/*
1725 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1726 * @substream: the PCM substream
1727 *
1728 * After this call, all streams are changed to SUSPENDED state.
1729 *
1730 * Return: Zero if successful, or a negative error code.
1731 */
1732static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1733{
1734 int err;
1735 unsigned long flags;
1736
1737 snd_pcm_stream_lock_irqsave(substream, flags);
1738 err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1739 ACTION_ARG_IGNORE);
1740 snd_pcm_stream_unlock_irqrestore(substream, flags);
1741 return err;
1742}
1743
1744/**
1745 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1746 * @pcm: the PCM instance
1747 *
1748 * After this call, all streams are changed to SUSPENDED state.
1749 *
1750 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1751 */
1752int snd_pcm_suspend_all(struct snd_pcm *pcm)
1753{
1754 struct snd_pcm_substream *substream;
1755 int stream, err = 0;
1756
1757 if (! pcm)
1758 return 0;
1759
1760 for_each_pcm_substream(pcm, stream, substream) {
1761 /* FIXME: the open/close code should lock this as well */
1762 if (!substream->runtime)
1763 continue;
1764
1765 /*
1766 * Skip BE dai link PCM's that are internal and may
1767 * not have their substream ops set.
1768 */
1769 if (!substream->ops)
1770 continue;
1771
1772 err = snd_pcm_suspend(substream);
1773 if (err < 0 && err != -EBUSY)
1774 return err;
1775 }
1776
1777 for_each_pcm_substream(pcm, stream, substream)
1778 snd_pcm_sync_stop(substream, false);
1779
1780 return 0;
1781}
1782EXPORT_SYMBOL(snd_pcm_suspend_all);
1783
1784/* resume callbacks: state argument ignored */
1785
1786static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1787 snd_pcm_state_t state)
1788{
1789 struct snd_pcm_runtime *runtime = substream->runtime;
1790 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1791 return -ENOSYS;
1792 runtime->trigger_master = substream;
1793 return 0;
1794}
1795
1796static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1797 snd_pcm_state_t state)
1798{
1799 struct snd_pcm_runtime *runtime = substream->runtime;
1800 if (runtime->trigger_master != substream)
1801 return 0;
1802 /* DMA not running previously? */
1803 if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1804 (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1805 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1806 return 0;
1807 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1808}
1809
1810static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1811 snd_pcm_state_t state)
1812{
1813 if (substream->runtime->trigger_master == substream &&
1814 snd_pcm_running(substream))
1815 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1816}
1817
1818static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1819 snd_pcm_state_t state)
1820{
1821 struct snd_pcm_runtime *runtime = substream->runtime;
1822 snd_pcm_trigger_tstamp(substream);
1823 __snd_pcm_set_state(runtime, runtime->suspended_state);
1824 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1825}
1826
1827static const struct action_ops snd_pcm_action_resume = {
1828 .pre_action = snd_pcm_pre_resume,
1829 .do_action = snd_pcm_do_resume,
1830 .undo_action = snd_pcm_undo_resume,
1831 .post_action = snd_pcm_post_resume
1832};
1833
1834static int snd_pcm_resume(struct snd_pcm_substream *substream)
1835{
1836 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1837 ACTION_ARG_IGNORE);
1838}
1839
1840#else
1841
1842static int snd_pcm_resume(struct snd_pcm_substream *substream)
1843{
1844 return -ENOSYS;
1845}
1846
1847#endif /* CONFIG_PM */
1848
1849/*
1850 * xrun ioctl
1851 *
1852 * Change the RUNNING stream(s) to XRUN state.
1853 */
1854static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1855{
1856 struct snd_pcm_runtime *runtime = substream->runtime;
1857 int result;
1858
1859 snd_pcm_stream_lock_irq(substream);
1860 switch (runtime->state) {
1861 case SNDRV_PCM_STATE_XRUN:
1862 result = 0; /* already there */
1863 break;
1864 case SNDRV_PCM_STATE_RUNNING:
1865 __snd_pcm_xrun(substream);
1866 result = 0;
1867 break;
1868 default:
1869 result = -EBADFD;
1870 }
1871 snd_pcm_stream_unlock_irq(substream);
1872 return result;
1873}
1874
1875/*
1876 * reset ioctl
1877 */
1878/* reset callbacks: state argument ignored */
1879static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1880 snd_pcm_state_t state)
1881{
1882 struct snd_pcm_runtime *runtime = substream->runtime;
1883 switch (runtime->state) {
1884 case SNDRV_PCM_STATE_RUNNING:
1885 case SNDRV_PCM_STATE_PREPARED:
1886 case SNDRV_PCM_STATE_PAUSED:
1887 case SNDRV_PCM_STATE_SUSPENDED:
1888 return 0;
1889 default:
1890 return -EBADFD;
1891 }
1892}
1893
1894static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1895 snd_pcm_state_t state)
1896{
1897 struct snd_pcm_runtime *runtime = substream->runtime;
1898 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1899 if (err < 0)
1900 return err;
1901 snd_pcm_stream_lock_irq(substream);
1902 runtime->hw_ptr_base = 0;
1903 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1904 runtime->status->hw_ptr % runtime->period_size;
1905 runtime->silence_start = runtime->status->hw_ptr;
1906 runtime->silence_filled = 0;
1907 snd_pcm_stream_unlock_irq(substream);
1908 return 0;
1909}
1910
1911static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1912 snd_pcm_state_t state)
1913{
1914 struct snd_pcm_runtime *runtime = substream->runtime;
1915 snd_pcm_stream_lock_irq(substream);
1916 runtime->control->appl_ptr = runtime->status->hw_ptr;
1917 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1918 runtime->silence_size > 0)
1919 snd_pcm_playback_silence(substream, ULONG_MAX);
1920 snd_pcm_stream_unlock_irq(substream);
1921}
1922
1923static const struct action_ops snd_pcm_action_reset = {
1924 .pre_action = snd_pcm_pre_reset,
1925 .do_action = snd_pcm_do_reset,
1926 .post_action = snd_pcm_post_reset
1927};
1928
1929static int snd_pcm_reset(struct snd_pcm_substream *substream)
1930{
1931 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1932 ACTION_ARG_IGNORE);
1933}
1934
1935/*
1936 * prepare ioctl
1937 */
1938/* pass f_flags as state argument */
1939static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1940 snd_pcm_state_t state)
1941{
1942 struct snd_pcm_runtime *runtime = substream->runtime;
1943 int f_flags = (__force int)state;
1944
1945 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1946 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1947 return -EBADFD;
1948 if (snd_pcm_running(substream))
1949 return -EBUSY;
1950 substream->f_flags = f_flags;
1951 return 0;
1952}
1953
1954static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1955 snd_pcm_state_t state)
1956{
1957 int err;
1958 snd_pcm_sync_stop(substream, true);
1959 err = substream->ops->prepare(substream);
1960 if (err < 0)
1961 return err;
1962 return snd_pcm_do_reset(substream, state);
1963}
1964
1965static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1966 snd_pcm_state_t state)
1967{
1968 struct snd_pcm_runtime *runtime = substream->runtime;
1969 runtime->control->appl_ptr = runtime->status->hw_ptr;
1970 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1971}
1972
1973static const struct action_ops snd_pcm_action_prepare = {
1974 .pre_action = snd_pcm_pre_prepare,
1975 .do_action = snd_pcm_do_prepare,
1976 .post_action = snd_pcm_post_prepare
1977};
1978
1979/**
1980 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1981 * @substream: the PCM substream instance
1982 * @file: file to refer f_flags
1983 *
1984 * Return: Zero if successful, or a negative error code.
1985 */
1986static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1987 struct file *file)
1988{
1989 int f_flags;
1990
1991 if (file)
1992 f_flags = file->f_flags;
1993 else
1994 f_flags = substream->f_flags;
1995
1996 snd_pcm_stream_lock_irq(substream);
1997 switch (substream->runtime->state) {
1998 case SNDRV_PCM_STATE_PAUSED:
1999 snd_pcm_pause(substream, false);
2000 fallthrough;
2001 case SNDRV_PCM_STATE_SUSPENDED:
2002 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2003 break;
2004 }
2005 snd_pcm_stream_unlock_irq(substream);
2006
2007 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
2008 substream,
2009 (__force snd_pcm_state_t)f_flags);
2010}
2011
2012/*
2013 * drain ioctl
2014 */
2015
2016/* drain init callbacks: state argument ignored */
2017static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2018 snd_pcm_state_t state)
2019{
2020 struct snd_pcm_runtime *runtime = substream->runtime;
2021 switch (runtime->state) {
2022 case SNDRV_PCM_STATE_OPEN:
2023 case SNDRV_PCM_STATE_DISCONNECTED:
2024 case SNDRV_PCM_STATE_SUSPENDED:
2025 return -EBADFD;
2026 }
2027 runtime->trigger_master = substream;
2028 return 0;
2029}
2030
2031static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2032 snd_pcm_state_t state)
2033{
2034 struct snd_pcm_runtime *runtime = substream->runtime;
2035 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2036 switch (runtime->state) {
2037 case SNDRV_PCM_STATE_PREPARED:
2038 /* start playback stream if possible */
2039 if (! snd_pcm_playback_empty(substream)) {
2040 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2041 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2042 } else {
2043 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2044 }
2045 break;
2046 case SNDRV_PCM_STATE_RUNNING:
2047 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2048 break;
2049 case SNDRV_PCM_STATE_XRUN:
2050 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2051 break;
2052 default:
2053 break;
2054 }
2055 } else {
2056 /* stop running stream */
2057 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2058 snd_pcm_state_t new_state;
2059
2060 new_state = snd_pcm_capture_avail(runtime) > 0 ?
2061 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2062 snd_pcm_do_stop(substream, new_state);
2063 snd_pcm_post_stop(substream, new_state);
2064 }
2065 }
2066
2067 if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2068 runtime->trigger_master == substream &&
2069 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2070 return substream->ops->trigger(substream,
2071 SNDRV_PCM_TRIGGER_DRAIN);
2072
2073 return 0;
2074}
2075
2076static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2077 snd_pcm_state_t state)
2078{
2079}
2080
2081static const struct action_ops snd_pcm_action_drain_init = {
2082 .pre_action = snd_pcm_pre_drain_init,
2083 .do_action = snd_pcm_do_drain_init,
2084 .post_action = snd_pcm_post_drain_init
2085};
2086
2087/*
2088 * Drain the stream(s).
2089 * When the substream is linked, sync until the draining of all playback streams
2090 * is finished.
2091 * After this call, all streams are supposed to be either SETUP or DRAINING
2092 * (capture only) state.
2093 */
2094static int snd_pcm_drain(struct snd_pcm_substream *substream,
2095 struct file *file)
2096{
2097 struct snd_card *card;
2098 struct snd_pcm_runtime *runtime;
2099 struct snd_pcm_substream *s;
2100 struct snd_pcm_group *group;
2101 wait_queue_entry_t wait;
2102 int result = 0;
2103 int nonblock = 0;
2104
2105 card = substream->pcm->card;
2106 runtime = substream->runtime;
2107
2108 if (runtime->state == SNDRV_PCM_STATE_OPEN)
2109 return -EBADFD;
2110
2111 if (file) {
2112 if (file->f_flags & O_NONBLOCK)
2113 nonblock = 1;
2114 } else if (substream->f_flags & O_NONBLOCK)
2115 nonblock = 1;
2116
2117 snd_pcm_stream_lock_irq(substream);
2118 /* resume pause */
2119 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2120 snd_pcm_pause(substream, false);
2121
2122 /* pre-start/stop - all running streams are changed to DRAINING state */
2123 result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2124 ACTION_ARG_IGNORE);
2125 if (result < 0)
2126 goto unlock;
2127 /* in non-blocking, we don't wait in ioctl but let caller poll */
2128 if (nonblock) {
2129 result = -EAGAIN;
2130 goto unlock;
2131 }
2132
2133 for (;;) {
2134 long tout;
2135 struct snd_pcm_runtime *to_check;
2136 if (signal_pending(current)) {
2137 result = -ERESTARTSYS;
2138 break;
2139 }
2140 /* find a substream to drain */
2141 to_check = NULL;
2142 group = snd_pcm_stream_group_ref(substream);
2143 snd_pcm_group_for_each_entry(s, substream) {
2144 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2145 continue;
2146 runtime = s->runtime;
2147 if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2148 to_check = runtime;
2149 break;
2150 }
2151 }
2152 snd_pcm_group_unref(group, substream);
2153 if (!to_check)
2154 break; /* all drained */
2155 init_waitqueue_entry(&wait, current);
2156 set_current_state(TASK_INTERRUPTIBLE);
2157 add_wait_queue(&to_check->sleep, &wait);
2158 snd_pcm_stream_unlock_irq(substream);
2159 if (runtime->no_period_wakeup)
2160 tout = MAX_SCHEDULE_TIMEOUT;
2161 else {
2162 tout = 10;
2163 if (runtime->rate) {
2164 long t = runtime->period_size * 2 / runtime->rate;
2165 tout = max(t, tout);
2166 }
2167 tout = msecs_to_jiffies(tout * 1000);
2168 }
2169 tout = schedule_timeout(tout);
2170
2171 snd_pcm_stream_lock_irq(substream);
2172 group = snd_pcm_stream_group_ref(substream);
2173 snd_pcm_group_for_each_entry(s, substream) {
2174 if (s->runtime == to_check) {
2175 remove_wait_queue(&to_check->sleep, &wait);
2176 break;
2177 }
2178 }
2179 snd_pcm_group_unref(group, substream);
2180
2181 if (card->shutdown) {
2182 result = -ENODEV;
2183 break;
2184 }
2185 if (tout == 0) {
2186 if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2187 result = -ESTRPIPE;
2188 else {
2189 dev_dbg(substream->pcm->card->dev,
2190 "playback drain error (DMA or IRQ trouble?)\n");
2191 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2192 result = -EIO;
2193 }
2194 break;
2195 }
2196 }
2197
2198 unlock:
2199 snd_pcm_stream_unlock_irq(substream);
2200
2201 return result;
2202}
2203
2204/*
2205 * drop ioctl
2206 *
2207 * Immediately put all linked substreams into SETUP state.
2208 */
2209static int snd_pcm_drop(struct snd_pcm_substream *substream)
2210{
2211 struct snd_pcm_runtime *runtime;
2212 int result = 0;
2213
2214 if (PCM_RUNTIME_CHECK(substream))
2215 return -ENXIO;
2216 runtime = substream->runtime;
2217
2218 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2219 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2220 return -EBADFD;
2221
2222 snd_pcm_stream_lock_irq(substream);
2223 /* resume pause */
2224 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2225 snd_pcm_pause(substream, false);
2226
2227 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2228 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2229 snd_pcm_stream_unlock_irq(substream);
2230
2231 return result;
2232}
2233
2234
2235static bool is_pcm_file(struct file *file)
2236{
2237 struct inode *inode = file_inode(file);
2238 struct snd_pcm *pcm;
2239 unsigned int minor;
2240
2241 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2242 return false;
2243 minor = iminor(inode);
2244 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2245 if (!pcm)
2246 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2247 if (!pcm)
2248 return false;
2249 snd_card_unref(pcm->card);
2250 return true;
2251}
2252
2253/*
2254 * PCM link handling
2255 */
2256static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2257{
2258 int res = 0;
2259 struct snd_pcm_file *pcm_file;
2260 struct snd_pcm_substream *substream1;
2261 struct snd_pcm_group *group, *target_group;
2262 bool nonatomic = substream->pcm->nonatomic;
2263 struct fd f = fdget(fd);
2264
2265 if (!f.file)
2266 return -EBADFD;
2267 if (!is_pcm_file(f.file)) {
2268 res = -EBADFD;
2269 goto _badf;
2270 }
2271 pcm_file = f.file->private_data;
2272 substream1 = pcm_file->substream;
2273
2274 if (substream == substream1) {
2275 res = -EINVAL;
2276 goto _badf;
2277 }
2278
2279 group = kzalloc(sizeof(*group), GFP_KERNEL);
2280 if (!group) {
2281 res = -ENOMEM;
2282 goto _nolock;
2283 }
2284 snd_pcm_group_init(group);
2285
2286 down_write(&snd_pcm_link_rwsem);
2287 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2288 substream->runtime->state != substream1->runtime->state ||
2289 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2290 res = -EBADFD;
2291 goto _end;
2292 }
2293 if (snd_pcm_stream_linked(substream1)) {
2294 res = -EALREADY;
2295 goto _end;
2296 }
2297
2298 snd_pcm_stream_lock_irq(substream);
2299 if (!snd_pcm_stream_linked(substream)) {
2300 snd_pcm_group_assign(substream, group);
2301 group = NULL; /* assigned, don't free this one below */
2302 }
2303 target_group = substream->group;
2304 snd_pcm_stream_unlock_irq(substream);
2305
2306 snd_pcm_group_lock_irq(target_group, nonatomic);
2307 snd_pcm_stream_lock_nested(substream1);
2308 snd_pcm_group_assign(substream1, target_group);
2309 refcount_inc(&target_group->refs);
2310 snd_pcm_stream_unlock(substream1);
2311 snd_pcm_group_unlock_irq(target_group, nonatomic);
2312 _end:
2313 up_write(&snd_pcm_link_rwsem);
2314 _nolock:
2315 kfree(group);
2316 _badf:
2317 fdput(f);
2318 return res;
2319}
2320
2321static void relink_to_local(struct snd_pcm_substream *substream)
2322{
2323 snd_pcm_stream_lock_nested(substream);
2324 snd_pcm_group_assign(substream, &substream->self_group);
2325 snd_pcm_stream_unlock(substream);
2326}
2327
2328static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2329{
2330 struct snd_pcm_group *group;
2331 bool nonatomic = substream->pcm->nonatomic;
2332 bool do_free = false;
2333 int res = 0;
2334
2335 down_write(&snd_pcm_link_rwsem);
2336
2337 if (!snd_pcm_stream_linked(substream)) {
2338 res = -EALREADY;
2339 goto _end;
2340 }
2341
2342 group = substream->group;
2343 snd_pcm_group_lock_irq(group, nonatomic);
2344
2345 relink_to_local(substream);
2346 refcount_dec(&group->refs);
2347
2348 /* detach the last stream, too */
2349 if (list_is_singular(&group->substreams)) {
2350 relink_to_local(list_first_entry(&group->substreams,
2351 struct snd_pcm_substream,
2352 link_list));
2353 do_free = refcount_dec_and_test(&group->refs);
2354 }
2355
2356 snd_pcm_group_unlock_irq(group, nonatomic);
2357 if (do_free)
2358 kfree(group);
2359
2360 _end:
2361 up_write(&snd_pcm_link_rwsem);
2362 return res;
2363}
2364
2365/*
2366 * hw configurator
2367 */
2368static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2369 struct snd_pcm_hw_rule *rule)
2370{
2371 struct snd_interval t;
2372 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2373 hw_param_interval_c(params, rule->deps[1]), &t);
2374 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2375}
2376
2377static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2378 struct snd_pcm_hw_rule *rule)
2379{
2380 struct snd_interval t;
2381 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2382 hw_param_interval_c(params, rule->deps[1]), &t);
2383 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2384}
2385
2386static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2387 struct snd_pcm_hw_rule *rule)
2388{
2389 struct snd_interval t;
2390 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2391 hw_param_interval_c(params, rule->deps[1]),
2392 (unsigned long) rule->private, &t);
2393 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2394}
2395
2396static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2397 struct snd_pcm_hw_rule *rule)
2398{
2399 struct snd_interval t;
2400 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2401 (unsigned long) rule->private,
2402 hw_param_interval_c(params, rule->deps[1]), &t);
2403 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2404}
2405
2406static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2407 struct snd_pcm_hw_rule *rule)
2408{
2409 snd_pcm_format_t k;
2410 const struct snd_interval *i =
2411 hw_param_interval_c(params, rule->deps[0]);
2412 struct snd_mask m;
2413 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2414 snd_mask_any(&m);
2415 pcm_for_each_format(k) {
2416 int bits;
2417 if (!snd_mask_test_format(mask, k))
2418 continue;
2419 bits = snd_pcm_format_physical_width(k);
2420 if (bits <= 0)
2421 continue; /* ignore invalid formats */
2422 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2423 snd_mask_reset(&m, (__force unsigned)k);
2424 }
2425 return snd_mask_refine(mask, &m);
2426}
2427
2428static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2429 struct snd_pcm_hw_rule *rule)
2430{
2431 struct snd_interval t;
2432 snd_pcm_format_t k;
2433
2434 t.min = UINT_MAX;
2435 t.max = 0;
2436 t.openmin = 0;
2437 t.openmax = 0;
2438 pcm_for_each_format(k) {
2439 int bits;
2440 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2441 continue;
2442 bits = snd_pcm_format_physical_width(k);
2443 if (bits <= 0)
2444 continue; /* ignore invalid formats */
2445 if (t.min > (unsigned)bits)
2446 t.min = bits;
2447 if (t.max < (unsigned)bits)
2448 t.max = bits;
2449 }
2450 t.integer = 1;
2451 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2452}
2453
2454#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2455#error "Change this table"
2456#endif
2457
2458static const unsigned int rates[] = {
2459 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2460 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2461};
2462
2463const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2464 .count = ARRAY_SIZE(rates),
2465 .list = rates,
2466};
2467
2468static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2469 struct snd_pcm_hw_rule *rule)
2470{
2471 struct snd_pcm_hardware *hw = rule->private;
2472 return snd_interval_list(hw_param_interval(params, rule->var),
2473 snd_pcm_known_rates.count,
2474 snd_pcm_known_rates.list, hw->rates);
2475}
2476
2477static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2478 struct snd_pcm_hw_rule *rule)
2479{
2480 struct snd_interval t;
2481 struct snd_pcm_substream *substream = rule->private;
2482 t.min = 0;
2483 t.max = substream->buffer_bytes_max;
2484 t.openmin = 0;
2485 t.openmax = 0;
2486 t.integer = 1;
2487 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2488}
2489
2490static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2491{
2492 struct snd_pcm_runtime *runtime = substream->runtime;
2493 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2494 int k, err;
2495
2496 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2497 snd_mask_any(constrs_mask(constrs, k));
2498 }
2499
2500 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2501 snd_interval_any(constrs_interval(constrs, k));
2502 }
2503
2504 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2505 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2506 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2507 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2508 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2509
2510 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2511 snd_pcm_hw_rule_format, NULL,
2512 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2513 if (err < 0)
2514 return err;
2515 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2516 snd_pcm_hw_rule_sample_bits, NULL,
2517 SNDRV_PCM_HW_PARAM_FORMAT,
2518 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2519 if (err < 0)
2520 return err;
2521 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2522 snd_pcm_hw_rule_div, NULL,
2523 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2524 if (err < 0)
2525 return err;
2526 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2527 snd_pcm_hw_rule_mul, NULL,
2528 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2529 if (err < 0)
2530 return err;
2531 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2532 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2533 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2534 if (err < 0)
2535 return err;
2536 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2537 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2538 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2539 if (err < 0)
2540 return err;
2541 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2542 snd_pcm_hw_rule_div, NULL,
2543 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2544 if (err < 0)
2545 return err;
2546 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2547 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2548 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2549 if (err < 0)
2550 return err;
2551 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2552 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2553 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2554 if (err < 0)
2555 return err;
2556 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2557 snd_pcm_hw_rule_div, NULL,
2558 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2559 if (err < 0)
2560 return err;
2561 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2562 snd_pcm_hw_rule_div, NULL,
2563 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2564 if (err < 0)
2565 return err;
2566 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2567 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2568 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2569 if (err < 0)
2570 return err;
2571 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2572 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2573 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2574 if (err < 0)
2575 return err;
2576 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2577 snd_pcm_hw_rule_mul, NULL,
2578 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2579 if (err < 0)
2580 return err;
2581 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2582 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2583 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2584 if (err < 0)
2585 return err;
2586 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2587 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2588 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2589 if (err < 0)
2590 return err;
2591 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2592 snd_pcm_hw_rule_muldivk, (void*) 8,
2593 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2594 if (err < 0)
2595 return err;
2596 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2597 snd_pcm_hw_rule_muldivk, (void*) 8,
2598 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2599 if (err < 0)
2600 return err;
2601 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2602 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2603 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2604 if (err < 0)
2605 return err;
2606 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2607 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2608 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2609 if (err < 0)
2610 return err;
2611 return 0;
2612}
2613
2614static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2615{
2616 struct snd_pcm_runtime *runtime = substream->runtime;
2617 struct snd_pcm_hardware *hw = &runtime->hw;
2618 int err;
2619 unsigned int mask = 0;
2620
2621 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2622 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2623 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2624 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2625 if (hw_support_mmap(substream)) {
2626 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2627 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2628 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2629 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2630 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2631 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2632 }
2633 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2634 if (err < 0)
2635 return err;
2636
2637 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2638 if (err < 0)
2639 return err;
2640
2641 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2642 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2643 if (err < 0)
2644 return err;
2645
2646 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2647 hw->channels_min, hw->channels_max);
2648 if (err < 0)
2649 return err;
2650
2651 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2652 hw->rate_min, hw->rate_max);
2653 if (err < 0)
2654 return err;
2655
2656 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2657 hw->period_bytes_min, hw->period_bytes_max);
2658 if (err < 0)
2659 return err;
2660
2661 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2662 hw->periods_min, hw->periods_max);
2663 if (err < 0)
2664 return err;
2665
2666 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2667 hw->period_bytes_min, hw->buffer_bytes_max);
2668 if (err < 0)
2669 return err;
2670
2671 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2672 snd_pcm_hw_rule_buffer_bytes_max, substream,
2673 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2674 if (err < 0)
2675 return err;
2676
2677 /* FIXME: remove */
2678 if (runtime->dma_bytes) {
2679 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2680 if (err < 0)
2681 return err;
2682 }
2683
2684 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2685 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2686 snd_pcm_hw_rule_rate, hw,
2687 SNDRV_PCM_HW_PARAM_RATE, -1);
2688 if (err < 0)
2689 return err;
2690 }
2691
2692 /* FIXME: this belong to lowlevel */
2693 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2694
2695 return 0;
2696}
2697
2698static void pcm_release_private(struct snd_pcm_substream *substream)
2699{
2700 if (snd_pcm_stream_linked(substream))
2701 snd_pcm_unlink(substream);
2702}
2703
2704void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2705{
2706 substream->ref_count--;
2707 if (substream->ref_count > 0)
2708 return;
2709
2710 snd_pcm_drop(substream);
2711 if (substream->hw_opened) {
2712 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2713 do_hw_free(substream);
2714 substream->ops->close(substream);
2715 substream->hw_opened = 0;
2716 }
2717 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2718 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2719 if (substream->pcm_release) {
2720 substream->pcm_release(substream);
2721 substream->pcm_release = NULL;
2722 }
2723 snd_pcm_detach_substream(substream);
2724}
2725EXPORT_SYMBOL(snd_pcm_release_substream);
2726
2727int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2728 struct file *file,
2729 struct snd_pcm_substream **rsubstream)
2730{
2731 struct snd_pcm_substream *substream;
2732 int err;
2733
2734 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2735 if (err < 0)
2736 return err;
2737 if (substream->ref_count > 1) {
2738 *rsubstream = substream;
2739 return 0;
2740 }
2741
2742 err = snd_pcm_hw_constraints_init(substream);
2743 if (err < 0) {
2744 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2745 goto error;
2746 }
2747
2748 err = substream->ops->open(substream);
2749 if (err < 0)
2750 goto error;
2751
2752 substream->hw_opened = 1;
2753
2754 err = snd_pcm_hw_constraints_complete(substream);
2755 if (err < 0) {
2756 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2757 goto error;
2758 }
2759
2760 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2761 * the DMA buffer requires it
2762 */
2763 if (substream->managed_buffer_alloc &&
2764 substream->dma_buffer.dev.need_sync)
2765 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2766
2767 *rsubstream = substream;
2768 return 0;
2769
2770 error:
2771 snd_pcm_release_substream(substream);
2772 return err;
2773}
2774EXPORT_SYMBOL(snd_pcm_open_substream);
2775
2776static int snd_pcm_open_file(struct file *file,
2777 struct snd_pcm *pcm,
2778 int stream)
2779{
2780 struct snd_pcm_file *pcm_file;
2781 struct snd_pcm_substream *substream;
2782 int err;
2783
2784 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2785 if (err < 0)
2786 return err;
2787
2788 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2789 if (pcm_file == NULL) {
2790 snd_pcm_release_substream(substream);
2791 return -ENOMEM;
2792 }
2793 pcm_file->substream = substream;
2794 if (substream->ref_count == 1)
2795 substream->pcm_release = pcm_release_private;
2796 file->private_data = pcm_file;
2797
2798 return 0;
2799}
2800
2801static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2802{
2803 struct snd_pcm *pcm;
2804 int err = nonseekable_open(inode, file);
2805 if (err < 0)
2806 return err;
2807 pcm = snd_lookup_minor_data(iminor(inode),
2808 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2809 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2810 if (pcm)
2811 snd_card_unref(pcm->card);
2812 return err;
2813}
2814
2815static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2816{
2817 struct snd_pcm *pcm;
2818 int err = nonseekable_open(inode, file);
2819 if (err < 0)
2820 return err;
2821 pcm = snd_lookup_minor_data(iminor(inode),
2822 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2823 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2824 if (pcm)
2825 snd_card_unref(pcm->card);
2826 return err;
2827}
2828
2829static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2830{
2831 int err;
2832 wait_queue_entry_t wait;
2833
2834 if (pcm == NULL) {
2835 err = -ENODEV;
2836 goto __error1;
2837 }
2838 err = snd_card_file_add(pcm->card, file);
2839 if (err < 0)
2840 goto __error1;
2841 if (!try_module_get(pcm->card->module)) {
2842 err = -EFAULT;
2843 goto __error2;
2844 }
2845 init_waitqueue_entry(&wait, current);
2846 add_wait_queue(&pcm->open_wait, &wait);
2847 mutex_lock(&pcm->open_mutex);
2848 while (1) {
2849 err = snd_pcm_open_file(file, pcm, stream);
2850 if (err >= 0)
2851 break;
2852 if (err == -EAGAIN) {
2853 if (file->f_flags & O_NONBLOCK) {
2854 err = -EBUSY;
2855 break;
2856 }
2857 } else
2858 break;
2859 set_current_state(TASK_INTERRUPTIBLE);
2860 mutex_unlock(&pcm->open_mutex);
2861 schedule();
2862 mutex_lock(&pcm->open_mutex);
2863 if (pcm->card->shutdown) {
2864 err = -ENODEV;
2865 break;
2866 }
2867 if (signal_pending(current)) {
2868 err = -ERESTARTSYS;
2869 break;
2870 }
2871 }
2872 remove_wait_queue(&pcm->open_wait, &wait);
2873 mutex_unlock(&pcm->open_mutex);
2874 if (err < 0)
2875 goto __error;
2876 return err;
2877
2878 __error:
2879 module_put(pcm->card->module);
2880 __error2:
2881 snd_card_file_remove(pcm->card, file);
2882 __error1:
2883 return err;
2884}
2885
2886static int snd_pcm_release(struct inode *inode, struct file *file)
2887{
2888 struct snd_pcm *pcm;
2889 struct snd_pcm_substream *substream;
2890 struct snd_pcm_file *pcm_file;
2891
2892 pcm_file = file->private_data;
2893 substream = pcm_file->substream;
2894 if (snd_BUG_ON(!substream))
2895 return -ENXIO;
2896 pcm = substream->pcm;
2897
2898 /* block until the device gets woken up as it may touch the hardware */
2899 snd_power_wait(pcm->card);
2900
2901 mutex_lock(&pcm->open_mutex);
2902 snd_pcm_release_substream(substream);
2903 kfree(pcm_file);
2904 mutex_unlock(&pcm->open_mutex);
2905 wake_up(&pcm->open_wait);
2906 module_put(pcm->card->module);
2907 snd_card_file_remove(pcm->card, file);
2908 return 0;
2909}
2910
2911/* check and update PCM state; return 0 or a negative error
2912 * call this inside PCM lock
2913 */
2914static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2915{
2916 switch (substream->runtime->state) {
2917 case SNDRV_PCM_STATE_DRAINING:
2918 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2919 return -EBADFD;
2920 fallthrough;
2921 case SNDRV_PCM_STATE_RUNNING:
2922 return snd_pcm_update_hw_ptr(substream);
2923 case SNDRV_PCM_STATE_PREPARED:
2924 case SNDRV_PCM_STATE_PAUSED:
2925 return 0;
2926 case SNDRV_PCM_STATE_SUSPENDED:
2927 return -ESTRPIPE;
2928 case SNDRV_PCM_STATE_XRUN:
2929 return -EPIPE;
2930 default:
2931 return -EBADFD;
2932 }
2933}
2934
2935/* increase the appl_ptr; returns the processed frames or a negative error */
2936static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2937 snd_pcm_uframes_t frames,
2938 snd_pcm_sframes_t avail)
2939{
2940 struct snd_pcm_runtime *runtime = substream->runtime;
2941 snd_pcm_sframes_t appl_ptr;
2942 int ret;
2943
2944 if (avail <= 0)
2945 return 0;
2946 if (frames > (snd_pcm_uframes_t)avail)
2947 frames = avail;
2948 appl_ptr = runtime->control->appl_ptr + frames;
2949 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2950 appl_ptr -= runtime->boundary;
2951 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2952 return ret < 0 ? ret : frames;
2953}
2954
2955/* decrease the appl_ptr; returns the processed frames or zero for error */
2956static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2957 snd_pcm_uframes_t frames,
2958 snd_pcm_sframes_t avail)
2959{
2960 struct snd_pcm_runtime *runtime = substream->runtime;
2961 snd_pcm_sframes_t appl_ptr;
2962 int ret;
2963
2964 if (avail <= 0)
2965 return 0;
2966 if (frames > (snd_pcm_uframes_t)avail)
2967 frames = avail;
2968 appl_ptr = runtime->control->appl_ptr - frames;
2969 if (appl_ptr < 0)
2970 appl_ptr += runtime->boundary;
2971 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2972 /* NOTE: we return zero for errors because PulseAudio gets depressed
2973 * upon receiving an error from rewind ioctl and stops processing
2974 * any longer. Returning zero means that no rewind is done, so
2975 * it's not absolutely wrong to answer like that.
2976 */
2977 return ret < 0 ? 0 : frames;
2978}
2979
2980static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2981 snd_pcm_uframes_t frames)
2982{
2983 snd_pcm_sframes_t ret;
2984
2985 if (frames == 0)
2986 return 0;
2987
2988 snd_pcm_stream_lock_irq(substream);
2989 ret = do_pcm_hwsync(substream);
2990 if (!ret)
2991 ret = rewind_appl_ptr(substream, frames,
2992 snd_pcm_hw_avail(substream));
2993 snd_pcm_stream_unlock_irq(substream);
2994 if (ret >= 0)
2995 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2996 return ret;
2997}
2998
2999static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
3000 snd_pcm_uframes_t frames)
3001{
3002 snd_pcm_sframes_t ret;
3003
3004 if (frames == 0)
3005 return 0;
3006
3007 snd_pcm_stream_lock_irq(substream);
3008 ret = do_pcm_hwsync(substream);
3009 if (!ret)
3010 ret = forward_appl_ptr(substream, frames,
3011 snd_pcm_avail(substream));
3012 snd_pcm_stream_unlock_irq(substream);
3013 if (ret >= 0)
3014 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3015 return ret;
3016}
3017
3018static int snd_pcm_delay(struct snd_pcm_substream *substream,
3019 snd_pcm_sframes_t *delay)
3020{
3021 int err;
3022
3023 snd_pcm_stream_lock_irq(substream);
3024 err = do_pcm_hwsync(substream);
3025 if (delay && !err)
3026 *delay = snd_pcm_calc_delay(substream);
3027 snd_pcm_stream_unlock_irq(substream);
3028 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3029
3030 return err;
3031}
3032
3033static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3034{
3035 return snd_pcm_delay(substream, NULL);
3036}
3037
3038static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3039 struct snd_pcm_sync_ptr __user *_sync_ptr)
3040{
3041 struct snd_pcm_runtime *runtime = substream->runtime;
3042 struct snd_pcm_sync_ptr sync_ptr;
3043 volatile struct snd_pcm_mmap_status *status;
3044 volatile struct snd_pcm_mmap_control *control;
3045 int err;
3046
3047 memset(&sync_ptr, 0, sizeof(sync_ptr));
3048 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3049 return -EFAULT;
3050 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3051 return -EFAULT;
3052 status = runtime->status;
3053 control = runtime->control;
3054 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3055 err = snd_pcm_hwsync(substream);
3056 if (err < 0)
3057 return err;
3058 }
3059 snd_pcm_stream_lock_irq(substream);
3060 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3061 err = pcm_lib_apply_appl_ptr(substream,
3062 sync_ptr.c.control.appl_ptr);
3063 if (err < 0) {
3064 snd_pcm_stream_unlock_irq(substream);
3065 return err;
3066 }
3067 } else {
3068 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3069 }
3070 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3071 control->avail_min = sync_ptr.c.control.avail_min;
3072 else
3073 sync_ptr.c.control.avail_min = control->avail_min;
3074 sync_ptr.s.status.state = status->state;
3075 sync_ptr.s.status.hw_ptr = status->hw_ptr;
3076 sync_ptr.s.status.tstamp = status->tstamp;
3077 sync_ptr.s.status.suspended_state = status->suspended_state;
3078 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3079 snd_pcm_stream_unlock_irq(substream);
3080 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3081 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3082 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3083 return -EFAULT;
3084 return 0;
3085}
3086
3087struct snd_pcm_mmap_status32 {
3088 snd_pcm_state_t state;
3089 s32 pad1;
3090 u32 hw_ptr;
3091 s32 tstamp_sec;
3092 s32 tstamp_nsec;
3093 snd_pcm_state_t suspended_state;
3094 s32 audio_tstamp_sec;
3095 s32 audio_tstamp_nsec;
3096} __attribute__((packed));
3097
3098struct snd_pcm_mmap_control32 {
3099 u32 appl_ptr;
3100 u32 avail_min;
3101};
3102
3103struct snd_pcm_sync_ptr32 {
3104 u32 flags;
3105 union {
3106 struct snd_pcm_mmap_status32 status;
3107 unsigned char reserved[64];
3108 } s;
3109 union {
3110 struct snd_pcm_mmap_control32 control;
3111 unsigned char reserved[64];
3112 } c;
3113} __attribute__((packed));
3114
3115/* recalcuate the boundary within 32bit */
3116static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3117{
3118 snd_pcm_uframes_t boundary;
3119
3120 if (! runtime->buffer_size)
3121 return 0;
3122 boundary = runtime->buffer_size;
3123 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3124 boundary *= 2;
3125 return boundary;
3126}
3127
3128static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3129 struct snd_pcm_sync_ptr32 __user *src)
3130{
3131 struct snd_pcm_runtime *runtime = substream->runtime;
3132 volatile struct snd_pcm_mmap_status *status;
3133 volatile struct snd_pcm_mmap_control *control;
3134 u32 sflags;
3135 struct snd_pcm_mmap_control scontrol;
3136 struct snd_pcm_mmap_status sstatus;
3137 snd_pcm_uframes_t boundary;
3138 int err;
3139
3140 if (snd_BUG_ON(!runtime))
3141 return -EINVAL;
3142
3143 if (get_user(sflags, &src->flags) ||
3144 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3145 get_user(scontrol.avail_min, &src->c.control.avail_min))
3146 return -EFAULT;
3147 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3148 err = snd_pcm_hwsync(substream);
3149 if (err < 0)
3150 return err;
3151 }
3152 status = runtime->status;
3153 control = runtime->control;
3154 boundary = recalculate_boundary(runtime);
3155 if (! boundary)
3156 boundary = 0x7fffffff;
3157 snd_pcm_stream_lock_irq(substream);
3158 /* FIXME: we should consider the boundary for the sync from app */
3159 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3160 err = pcm_lib_apply_appl_ptr(substream,
3161 scontrol.appl_ptr);
3162 if (err < 0) {
3163 snd_pcm_stream_unlock_irq(substream);
3164 return err;
3165 }
3166 } else
3167 scontrol.appl_ptr = control->appl_ptr % boundary;
3168 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3169 control->avail_min = scontrol.avail_min;
3170 else
3171 scontrol.avail_min = control->avail_min;
3172 sstatus.state = status->state;
3173 sstatus.hw_ptr = status->hw_ptr % boundary;
3174 sstatus.tstamp = status->tstamp;
3175 sstatus.suspended_state = status->suspended_state;
3176 sstatus.audio_tstamp = status->audio_tstamp;
3177 snd_pcm_stream_unlock_irq(substream);
3178 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3179 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3180 if (put_user(sstatus.state, &src->s.status.state) ||
3181 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3182 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3183 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3184 put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3185 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3186 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3187 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3188 put_user(scontrol.avail_min, &src->c.control.avail_min))
3189 return -EFAULT;
3190
3191 return 0;
3192}
3193#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3194
3195static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3196{
3197 struct snd_pcm_runtime *runtime = substream->runtime;
3198 int arg;
3199
3200 if (get_user(arg, _arg))
3201 return -EFAULT;
3202 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3203 return -EINVAL;
3204 runtime->tstamp_type = arg;
3205 return 0;
3206}
3207
3208static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3209 struct snd_xferi __user *_xferi)
3210{
3211 struct snd_xferi xferi;
3212 struct snd_pcm_runtime *runtime = substream->runtime;
3213 snd_pcm_sframes_t result;
3214
3215 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3216 return -EBADFD;
3217 if (put_user(0, &_xferi->result))
3218 return -EFAULT;
3219 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3220 return -EFAULT;
3221 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3222 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3223 else
3224 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3225 if (put_user(result, &_xferi->result))
3226 return -EFAULT;
3227 return result < 0 ? result : 0;
3228}
3229
3230static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3231 struct snd_xfern __user *_xfern)
3232{
3233 struct snd_xfern xfern;
3234 struct snd_pcm_runtime *runtime = substream->runtime;
3235 void *bufs;
3236 snd_pcm_sframes_t result;
3237
3238 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3239 return -EBADFD;
3240 if (runtime->channels > 128)
3241 return -EINVAL;
3242 if (put_user(0, &_xfern->result))
3243 return -EFAULT;
3244 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3245 return -EFAULT;
3246
3247 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3248 if (IS_ERR(bufs))
3249 return PTR_ERR(bufs);
3250 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3251 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3252 else
3253 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3254 kfree(bufs);
3255 if (put_user(result, &_xfern->result))
3256 return -EFAULT;
3257 return result < 0 ? result : 0;
3258}
3259
3260static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3261 snd_pcm_uframes_t __user *_frames)
3262{
3263 snd_pcm_uframes_t frames;
3264 snd_pcm_sframes_t result;
3265
3266 if (get_user(frames, _frames))
3267 return -EFAULT;
3268 if (put_user(0, _frames))
3269 return -EFAULT;
3270 result = snd_pcm_rewind(substream, frames);
3271 if (put_user(result, _frames))
3272 return -EFAULT;
3273 return result < 0 ? result : 0;
3274}
3275
3276static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3277 snd_pcm_uframes_t __user *_frames)
3278{
3279 snd_pcm_uframes_t frames;
3280 snd_pcm_sframes_t result;
3281
3282 if (get_user(frames, _frames))
3283 return -EFAULT;
3284 if (put_user(0, _frames))
3285 return -EFAULT;
3286 result = snd_pcm_forward(substream, frames);
3287 if (put_user(result, _frames))
3288 return -EFAULT;
3289 return result < 0 ? result : 0;
3290}
3291
3292static int snd_pcm_common_ioctl(struct file *file,
3293 struct snd_pcm_substream *substream,
3294 unsigned int cmd, void __user *arg)
3295{
3296 struct snd_pcm_file *pcm_file = file->private_data;
3297 int res;
3298
3299 if (PCM_RUNTIME_CHECK(substream))
3300 return -ENXIO;
3301
3302 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3303 return -EBADFD;
3304
3305 res = snd_power_wait(substream->pcm->card);
3306 if (res < 0)
3307 return res;
3308
3309 switch (cmd) {
3310 case SNDRV_PCM_IOCTL_PVERSION:
3311 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3312 case SNDRV_PCM_IOCTL_INFO:
3313 return snd_pcm_info_user(substream, arg);
3314 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
3315 return 0;
3316 case SNDRV_PCM_IOCTL_TTSTAMP:
3317 return snd_pcm_tstamp(substream, arg);
3318 case SNDRV_PCM_IOCTL_USER_PVERSION:
3319 if (get_user(pcm_file->user_pversion,
3320 (unsigned int __user *)arg))
3321 return -EFAULT;
3322 return 0;
3323 case SNDRV_PCM_IOCTL_HW_REFINE:
3324 return snd_pcm_hw_refine_user(substream, arg);
3325 case SNDRV_PCM_IOCTL_HW_PARAMS:
3326 return snd_pcm_hw_params_user(substream, arg);
3327 case SNDRV_PCM_IOCTL_HW_FREE:
3328 return snd_pcm_hw_free(substream);
3329 case SNDRV_PCM_IOCTL_SW_PARAMS:
3330 return snd_pcm_sw_params_user(substream, arg);
3331 case SNDRV_PCM_IOCTL_STATUS32:
3332 return snd_pcm_status_user32(substream, arg, false);
3333 case SNDRV_PCM_IOCTL_STATUS_EXT32:
3334 return snd_pcm_status_user32(substream, arg, true);
3335 case SNDRV_PCM_IOCTL_STATUS64:
3336 return snd_pcm_status_user64(substream, arg, false);
3337 case SNDRV_PCM_IOCTL_STATUS_EXT64:
3338 return snd_pcm_status_user64(substream, arg, true);
3339 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3340 return snd_pcm_channel_info_user(substream, arg);
3341 case SNDRV_PCM_IOCTL_PREPARE:
3342 return snd_pcm_prepare(substream, file);
3343 case SNDRV_PCM_IOCTL_RESET:
3344 return snd_pcm_reset(substream);
3345 case SNDRV_PCM_IOCTL_START:
3346 return snd_pcm_start_lock_irq(substream);
3347 case SNDRV_PCM_IOCTL_LINK:
3348 return snd_pcm_link(substream, (int)(unsigned long) arg);
3349 case SNDRV_PCM_IOCTL_UNLINK:
3350 return snd_pcm_unlink(substream);
3351 case SNDRV_PCM_IOCTL_RESUME:
3352 return snd_pcm_resume(substream);
3353 case SNDRV_PCM_IOCTL_XRUN:
3354 return snd_pcm_xrun(substream);
3355 case SNDRV_PCM_IOCTL_HWSYNC:
3356 return snd_pcm_hwsync(substream);
3357 case SNDRV_PCM_IOCTL_DELAY:
3358 {
3359 snd_pcm_sframes_t delay = 0;
3360 snd_pcm_sframes_t __user *res = arg;
3361 int err;
3362
3363 err = snd_pcm_delay(substream, &delay);
3364 if (err)
3365 return err;
3366 if (put_user(delay, res))
3367 return -EFAULT;
3368 return 0;
3369 }
3370 case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3371 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3372 case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3373 return snd_pcm_sync_ptr(substream, arg);
3374#ifdef CONFIG_SND_SUPPORT_OLD_API
3375 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3376 return snd_pcm_hw_refine_old_user(substream, arg);
3377 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3378 return snd_pcm_hw_params_old_user(substream, arg);
3379#endif
3380 case SNDRV_PCM_IOCTL_DRAIN:
3381 return snd_pcm_drain(substream, file);
3382 case SNDRV_PCM_IOCTL_DROP:
3383 return snd_pcm_drop(substream);
3384 case SNDRV_PCM_IOCTL_PAUSE:
3385 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3386 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3387 case SNDRV_PCM_IOCTL_READI_FRAMES:
3388 return snd_pcm_xferi_frames_ioctl(substream, arg);
3389 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3390 case SNDRV_PCM_IOCTL_READN_FRAMES:
3391 return snd_pcm_xfern_frames_ioctl(substream, arg);
3392 case SNDRV_PCM_IOCTL_REWIND:
3393 return snd_pcm_rewind_ioctl(substream, arg);
3394 case SNDRV_PCM_IOCTL_FORWARD:
3395 return snd_pcm_forward_ioctl(substream, arg);
3396 }
3397 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3398 return -ENOTTY;
3399}
3400
3401static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3402 unsigned long arg)
3403{
3404 struct snd_pcm_file *pcm_file;
3405
3406 pcm_file = file->private_data;
3407
3408 if (((cmd >> 8) & 0xff) != 'A')
3409 return -ENOTTY;
3410
3411 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3412 (void __user *)arg);
3413}
3414
3415/**
3416 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3417 * @substream: PCM substream
3418 * @cmd: IOCTL cmd
3419 * @arg: IOCTL argument
3420 *
3421 * The function is provided primarily for OSS layer and USB gadget drivers,
3422 * and it allows only the limited set of ioctls (hw_params, sw_params,
3423 * prepare, start, drain, drop, forward).
3424 *
3425 * Return: zero if successful, or a negative error code
3426 */
3427int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3428 unsigned int cmd, void *arg)
3429{
3430 snd_pcm_uframes_t *frames = arg;
3431 snd_pcm_sframes_t result;
3432
3433 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3434 return -EBADFD;
3435
3436 switch (cmd) {
3437 case SNDRV_PCM_IOCTL_FORWARD:
3438 {
3439 /* provided only for OSS; capture-only and no value returned */
3440 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3441 return -EINVAL;
3442 result = snd_pcm_forward(substream, *frames);
3443 return result < 0 ? result : 0;
3444 }
3445 case SNDRV_PCM_IOCTL_HW_PARAMS:
3446 return snd_pcm_hw_params(substream, arg);
3447 case SNDRV_PCM_IOCTL_SW_PARAMS:
3448 return snd_pcm_sw_params(substream, arg);
3449 case SNDRV_PCM_IOCTL_PREPARE:
3450 return snd_pcm_prepare(substream, NULL);
3451 case SNDRV_PCM_IOCTL_START:
3452 return snd_pcm_start_lock_irq(substream);
3453 case SNDRV_PCM_IOCTL_DRAIN:
3454 return snd_pcm_drain(substream, NULL);
3455 case SNDRV_PCM_IOCTL_DROP:
3456 return snd_pcm_drop(substream);
3457 case SNDRV_PCM_IOCTL_DELAY:
3458 return snd_pcm_delay(substream, frames);
3459 default:
3460 return -EINVAL;
3461 }
3462}
3463EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3464
3465static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3466 loff_t * offset)
3467{
3468 struct snd_pcm_file *pcm_file;
3469 struct snd_pcm_substream *substream;
3470 struct snd_pcm_runtime *runtime;
3471 snd_pcm_sframes_t result;
3472
3473 pcm_file = file->private_data;
3474 substream = pcm_file->substream;
3475 if (PCM_RUNTIME_CHECK(substream))
3476 return -ENXIO;
3477 runtime = substream->runtime;
3478 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3479 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3480 return -EBADFD;
3481 if (!frame_aligned(runtime, count))
3482 return -EINVAL;
3483 count = bytes_to_frames(runtime, count);
3484 result = snd_pcm_lib_read(substream, buf, count);
3485 if (result > 0)
3486 result = frames_to_bytes(runtime, result);
3487 return result;
3488}
3489
3490static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3491 size_t count, loff_t * offset)
3492{
3493 struct snd_pcm_file *pcm_file;
3494 struct snd_pcm_substream *substream;
3495 struct snd_pcm_runtime *runtime;
3496 snd_pcm_sframes_t result;
3497
3498 pcm_file = file->private_data;
3499 substream = pcm_file->substream;
3500 if (PCM_RUNTIME_CHECK(substream))
3501 return -ENXIO;
3502 runtime = substream->runtime;
3503 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3504 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3505 return -EBADFD;
3506 if (!frame_aligned(runtime, count))
3507 return -EINVAL;
3508 count = bytes_to_frames(runtime, count);
3509 result = snd_pcm_lib_write(substream, buf, count);
3510 if (result > 0)
3511 result = frames_to_bytes(runtime, result);
3512 return result;
3513}
3514
3515static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3516{
3517 struct snd_pcm_file *pcm_file;
3518 struct snd_pcm_substream *substream;
3519 struct snd_pcm_runtime *runtime;
3520 snd_pcm_sframes_t result;
3521 unsigned long i;
3522 void __user **bufs;
3523 snd_pcm_uframes_t frames;
3524
3525 pcm_file = iocb->ki_filp->private_data;
3526 substream = pcm_file->substream;
3527 if (PCM_RUNTIME_CHECK(substream))
3528 return -ENXIO;
3529 runtime = substream->runtime;
3530 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3531 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3532 return -EBADFD;
3533 if (!iter_is_iovec(to))
3534 return -EINVAL;
3535 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3536 return -EINVAL;
3537 if (!frame_aligned(runtime, to->iov->iov_len))
3538 return -EINVAL;
3539 frames = bytes_to_samples(runtime, to->iov->iov_len);
3540 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3541 if (bufs == NULL)
3542 return -ENOMEM;
3543 for (i = 0; i < to->nr_segs; ++i)
3544 bufs[i] = to->iov[i].iov_base;
3545 result = snd_pcm_lib_readv(substream, bufs, frames);
3546 if (result > 0)
3547 result = frames_to_bytes(runtime, result);
3548 kfree(bufs);
3549 return result;
3550}
3551
3552static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3553{
3554 struct snd_pcm_file *pcm_file;
3555 struct snd_pcm_substream *substream;
3556 struct snd_pcm_runtime *runtime;
3557 snd_pcm_sframes_t result;
3558 unsigned long i;
3559 void __user **bufs;
3560 snd_pcm_uframes_t frames;
3561
3562 pcm_file = iocb->ki_filp->private_data;
3563 substream = pcm_file->substream;
3564 if (PCM_RUNTIME_CHECK(substream))
3565 return -ENXIO;
3566 runtime = substream->runtime;
3567 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3568 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3569 return -EBADFD;
3570 if (!iter_is_iovec(from))
3571 return -EINVAL;
3572 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3573 !frame_aligned(runtime, from->iov->iov_len))
3574 return -EINVAL;
3575 frames = bytes_to_samples(runtime, from->iov->iov_len);
3576 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3577 if (bufs == NULL)
3578 return -ENOMEM;
3579 for (i = 0; i < from->nr_segs; ++i)
3580 bufs[i] = from->iov[i].iov_base;
3581 result = snd_pcm_lib_writev(substream, bufs, frames);
3582 if (result > 0)
3583 result = frames_to_bytes(runtime, result);
3584 kfree(bufs);
3585 return result;
3586}
3587
3588static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3589{
3590 struct snd_pcm_file *pcm_file;
3591 struct snd_pcm_substream *substream;
3592 struct snd_pcm_runtime *runtime;
3593 __poll_t mask, ok;
3594 snd_pcm_uframes_t avail;
3595
3596 pcm_file = file->private_data;
3597
3598 substream = pcm_file->substream;
3599 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3600 ok = EPOLLOUT | EPOLLWRNORM;
3601 else
3602 ok = EPOLLIN | EPOLLRDNORM;
3603 if (PCM_RUNTIME_CHECK(substream))
3604 return ok | EPOLLERR;
3605
3606 runtime = substream->runtime;
3607 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3608 return ok | EPOLLERR;
3609
3610 poll_wait(file, &runtime->sleep, wait);
3611
3612 mask = 0;
3613 snd_pcm_stream_lock_irq(substream);
3614 avail = snd_pcm_avail(substream);
3615 switch (runtime->state) {
3616 case SNDRV_PCM_STATE_RUNNING:
3617 case SNDRV_PCM_STATE_PREPARED:
3618 case SNDRV_PCM_STATE_PAUSED:
3619 if (avail >= runtime->control->avail_min)
3620 mask = ok;
3621 break;
3622 case SNDRV_PCM_STATE_DRAINING:
3623 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3624 mask = ok;
3625 if (!avail)
3626 mask |= EPOLLERR;
3627 }
3628 break;
3629 default:
3630 mask = ok | EPOLLERR;
3631 break;
3632 }
3633 snd_pcm_stream_unlock_irq(substream);
3634 return mask;
3635}
3636
3637/*
3638 * mmap support
3639 */
3640
3641/*
3642 * Only on coherent architectures, we can mmap the status and the control records
3643 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3644 */
3645#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3646/*
3647 * mmap status record
3648 */
3649static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3650{
3651 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3652 struct snd_pcm_runtime *runtime;
3653
3654 if (substream == NULL)
3655 return VM_FAULT_SIGBUS;
3656 runtime = substream->runtime;
3657 vmf->page = virt_to_page(runtime->status);
3658 get_page(vmf->page);
3659 return 0;
3660}
3661
3662static const struct vm_operations_struct snd_pcm_vm_ops_status =
3663{
3664 .fault = snd_pcm_mmap_status_fault,
3665};
3666
3667static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3668 struct vm_area_struct *area)
3669{
3670 long size;
3671 if (!(area->vm_flags & VM_READ))
3672 return -EINVAL;
3673 size = area->vm_end - area->vm_start;
3674 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3675 return -EINVAL;
3676 area->vm_ops = &snd_pcm_vm_ops_status;
3677 area->vm_private_data = substream;
3678 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3679 area->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
3680 return 0;
3681}
3682
3683/*
3684 * mmap control record
3685 */
3686static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3687{
3688 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3689 struct snd_pcm_runtime *runtime;
3690
3691 if (substream == NULL)
3692 return VM_FAULT_SIGBUS;
3693 runtime = substream->runtime;
3694 vmf->page = virt_to_page(runtime->control);
3695 get_page(vmf->page);
3696 return 0;
3697}
3698
3699static const struct vm_operations_struct snd_pcm_vm_ops_control =
3700{
3701 .fault = snd_pcm_mmap_control_fault,
3702};
3703
3704static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3705 struct vm_area_struct *area)
3706{
3707 long size;
3708 if (!(area->vm_flags & VM_READ))
3709 return -EINVAL;
3710 size = area->vm_end - area->vm_start;
3711 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3712 return -EINVAL;
3713 area->vm_ops = &snd_pcm_vm_ops_control;
3714 area->vm_private_data = substream;
3715 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3716 return 0;
3717}
3718
3719static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3720{
3721 /* If drivers require the explicit sync (typically for non-coherent
3722 * pages), we have to disable the mmap of status and control data
3723 * to enforce the control via SYNC_PTR ioctl.
3724 */
3725 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3726 return false;
3727 /* See pcm_control_mmap_allowed() below.
3728 * Since older alsa-lib requires both status and control mmaps to be
3729 * coupled, we have to disable the status mmap for old alsa-lib, too.
3730 */
3731 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3732 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3733 return false;
3734 return true;
3735}
3736
3737static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3738{
3739 if (pcm_file->no_compat_mmap)
3740 return false;
3741 /* see above */
3742 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3743 return false;
3744 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3745 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3746 * thus it effectively assures the manual update of appl_ptr.
3747 */
3748 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3749 return false;
3750 return true;
3751}
3752
3753#else /* ! coherent mmap */
3754/*
3755 * don't support mmap for status and control records.
3756 */
3757#define pcm_status_mmap_allowed(pcm_file) false
3758#define pcm_control_mmap_allowed(pcm_file) false
3759
3760static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3761 struct vm_area_struct *area)
3762{
3763 return -ENXIO;
3764}
3765static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3766 struct vm_area_struct *area)
3767{
3768 return -ENXIO;
3769}
3770#endif /* coherent mmap */
3771
3772/*
3773 * fault callback for mmapping a RAM page
3774 */
3775static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3776{
3777 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3778 struct snd_pcm_runtime *runtime;
3779 unsigned long offset;
3780 struct page * page;
3781 size_t dma_bytes;
3782
3783 if (substream == NULL)
3784 return VM_FAULT_SIGBUS;
3785 runtime = substream->runtime;
3786 offset = vmf->pgoff << PAGE_SHIFT;
3787 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3788 if (offset > dma_bytes - PAGE_SIZE)
3789 return VM_FAULT_SIGBUS;
3790 if (substream->ops->page)
3791 page = substream->ops->page(substream, offset);
3792 else if (!snd_pcm_get_dma_buf(substream))
3793 page = virt_to_page(runtime->dma_area + offset);
3794 else
3795 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3796 if (!page)
3797 return VM_FAULT_SIGBUS;
3798 get_page(page);
3799 vmf->page = page;
3800 return 0;
3801}
3802
3803static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3804 .open = snd_pcm_mmap_data_open,
3805 .close = snd_pcm_mmap_data_close,
3806};
3807
3808static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3809 .open = snd_pcm_mmap_data_open,
3810 .close = snd_pcm_mmap_data_close,
3811 .fault = snd_pcm_mmap_data_fault,
3812};
3813
3814/*
3815 * mmap the DMA buffer on RAM
3816 */
3817
3818/**
3819 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3820 * @substream: PCM substream
3821 * @area: VMA
3822 *
3823 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3824 * this function is invoked implicitly.
3825 *
3826 * Return: zero if successful, or a negative error code
3827 */
3828int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3829 struct vm_area_struct *area)
3830{
3831 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3832 if (!substream->ops->page &&
3833 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3834 return 0;
3835 /* mmap with fault handler */
3836 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3837 return 0;
3838}
3839EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3840
3841/*
3842 * mmap the DMA buffer on I/O memory area
3843 */
3844#if SNDRV_PCM_INFO_MMAP_IOMEM
3845/**
3846 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3847 * @substream: PCM substream
3848 * @area: VMA
3849 *
3850 * When your hardware uses the iomapped pages as the hardware buffer and
3851 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3852 * is supposed to work only on limited architectures.
3853 *
3854 * Return: zero if successful, or a negative error code
3855 */
3856int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3857 struct vm_area_struct *area)
3858{
3859 struct snd_pcm_runtime *runtime = substream->runtime;
3860
3861 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3862 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3863}
3864EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3865#endif /* SNDRV_PCM_INFO_MMAP */
3866
3867/*
3868 * mmap DMA buffer
3869 */
3870int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3871 struct vm_area_struct *area)
3872{
3873 struct snd_pcm_runtime *runtime;
3874 long size;
3875 unsigned long offset;
3876 size_t dma_bytes;
3877 int err;
3878
3879 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3880 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3881 return -EINVAL;
3882 } else {
3883 if (!(area->vm_flags & VM_READ))
3884 return -EINVAL;
3885 }
3886 runtime = substream->runtime;
3887 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3888 return -EBADFD;
3889 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3890 return -ENXIO;
3891 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3892 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3893 return -EINVAL;
3894 size = area->vm_end - area->vm_start;
3895 offset = area->vm_pgoff << PAGE_SHIFT;
3896 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3897 if ((size_t)size > dma_bytes)
3898 return -EINVAL;
3899 if (offset > dma_bytes - size)
3900 return -EINVAL;
3901
3902 area->vm_ops = &snd_pcm_vm_ops_data;
3903 area->vm_private_data = substream;
3904 if (substream->ops->mmap)
3905 err = substream->ops->mmap(substream, area);
3906 else
3907 err = snd_pcm_lib_default_mmap(substream, area);
3908 if (!err)
3909 atomic_inc(&substream->mmap_count);
3910 return err;
3911}
3912EXPORT_SYMBOL(snd_pcm_mmap_data);
3913
3914static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3915{
3916 struct snd_pcm_file * pcm_file;
3917 struct snd_pcm_substream *substream;
3918 unsigned long offset;
3919
3920 pcm_file = file->private_data;
3921 substream = pcm_file->substream;
3922 if (PCM_RUNTIME_CHECK(substream))
3923 return -ENXIO;
3924 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3925 return -EBADFD;
3926
3927 offset = area->vm_pgoff << PAGE_SHIFT;
3928 switch (offset) {
3929 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3930 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3931 return -ENXIO;
3932 fallthrough;
3933 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3934 if (!pcm_status_mmap_allowed(pcm_file))
3935 return -ENXIO;
3936 return snd_pcm_mmap_status(substream, file, area);
3937 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3938 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3939 return -ENXIO;
3940 fallthrough;
3941 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3942 if (!pcm_control_mmap_allowed(pcm_file))
3943 return -ENXIO;
3944 return snd_pcm_mmap_control(substream, file, area);
3945 default:
3946 return snd_pcm_mmap_data(substream, file, area);
3947 }
3948 return 0;
3949}
3950
3951static int snd_pcm_fasync(int fd, struct file * file, int on)
3952{
3953 struct snd_pcm_file * pcm_file;
3954 struct snd_pcm_substream *substream;
3955 struct snd_pcm_runtime *runtime;
3956
3957 pcm_file = file->private_data;
3958 substream = pcm_file->substream;
3959 if (PCM_RUNTIME_CHECK(substream))
3960 return -ENXIO;
3961 runtime = substream->runtime;
3962 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3963 return -EBADFD;
3964 return snd_fasync_helper(fd, file, on, &runtime->fasync);
3965}
3966
3967/*
3968 * ioctl32 compat
3969 */
3970#ifdef CONFIG_COMPAT
3971#include "pcm_compat.c"
3972#else
3973#define snd_pcm_ioctl_compat NULL
3974#endif
3975
3976/*
3977 * To be removed helpers to keep binary compatibility
3978 */
3979
3980#ifdef CONFIG_SND_SUPPORT_OLD_API
3981#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3982#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3983
3984static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3985 struct snd_pcm_hw_params_old *oparams)
3986{
3987 unsigned int i;
3988
3989 memset(params, 0, sizeof(*params));
3990 params->flags = oparams->flags;
3991 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3992 params->masks[i].bits[0] = oparams->masks[i];
3993 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3994 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3995 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3996 params->info = oparams->info;
3997 params->msbits = oparams->msbits;
3998 params->rate_num = oparams->rate_num;
3999 params->rate_den = oparams->rate_den;
4000 params->fifo_size = oparams->fifo_size;
4001}
4002
4003static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
4004 struct snd_pcm_hw_params *params)
4005{
4006 unsigned int i;
4007
4008 memset(oparams, 0, sizeof(*oparams));
4009 oparams->flags = params->flags;
4010 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4011 oparams->masks[i] = params->masks[i].bits[0];
4012 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4013 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4014 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4015 oparams->info = params->info;
4016 oparams->msbits = params->msbits;
4017 oparams->rate_num = params->rate_num;
4018 oparams->rate_den = params->rate_den;
4019 oparams->fifo_size = params->fifo_size;
4020}
4021
4022static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4023 struct snd_pcm_hw_params_old __user * _oparams)
4024{
4025 struct snd_pcm_hw_params *params;
4026 struct snd_pcm_hw_params_old *oparams = NULL;
4027 int err;
4028
4029 params = kmalloc(sizeof(*params), GFP_KERNEL);
4030 if (!params)
4031 return -ENOMEM;
4032
4033 oparams = memdup_user(_oparams, sizeof(*oparams));
4034 if (IS_ERR(oparams)) {
4035 err = PTR_ERR(oparams);
4036 goto out;
4037 }
4038 snd_pcm_hw_convert_from_old_params(params, oparams);
4039 err = snd_pcm_hw_refine(substream, params);
4040 if (err < 0)
4041 goto out_old;
4042
4043 err = fixup_unreferenced_params(substream, params);
4044 if (err < 0)
4045 goto out_old;
4046
4047 snd_pcm_hw_convert_to_old_params(oparams, params);
4048 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4049 err = -EFAULT;
4050out_old:
4051 kfree(oparams);
4052out:
4053 kfree(params);
4054 return err;
4055}
4056
4057static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4058 struct snd_pcm_hw_params_old __user * _oparams)
4059{
4060 struct snd_pcm_hw_params *params;
4061 struct snd_pcm_hw_params_old *oparams = NULL;
4062 int err;
4063
4064 params = kmalloc(sizeof(*params), GFP_KERNEL);
4065 if (!params)
4066 return -ENOMEM;
4067
4068 oparams = memdup_user(_oparams, sizeof(*oparams));
4069 if (IS_ERR(oparams)) {
4070 err = PTR_ERR(oparams);
4071 goto out;
4072 }
4073
4074 snd_pcm_hw_convert_from_old_params(params, oparams);
4075 err = snd_pcm_hw_params(substream, params);
4076 if (err < 0)
4077 goto out_old;
4078
4079 snd_pcm_hw_convert_to_old_params(oparams, params);
4080 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4081 err = -EFAULT;
4082out_old:
4083 kfree(oparams);
4084out:
4085 kfree(params);
4086 return err;
4087}
4088#endif /* CONFIG_SND_SUPPORT_OLD_API */
4089
4090#ifndef CONFIG_MMU
4091static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4092 unsigned long addr,
4093 unsigned long len,
4094 unsigned long pgoff,
4095 unsigned long flags)
4096{
4097 struct snd_pcm_file *pcm_file = file->private_data;
4098 struct snd_pcm_substream *substream = pcm_file->substream;
4099 struct snd_pcm_runtime *runtime = substream->runtime;
4100 unsigned long offset = pgoff << PAGE_SHIFT;
4101
4102 switch (offset) {
4103 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4104 return (unsigned long)runtime->status;
4105 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4106 return (unsigned long)runtime->control;
4107 default:
4108 return (unsigned long)runtime->dma_area + offset;
4109 }
4110}
4111#else
4112# define snd_pcm_get_unmapped_area NULL
4113#endif
4114
4115/*
4116 * Register section
4117 */
4118
4119const struct file_operations snd_pcm_f_ops[2] = {
4120 {
4121 .owner = THIS_MODULE,
4122 .write = snd_pcm_write,
4123 .write_iter = snd_pcm_writev,
4124 .open = snd_pcm_playback_open,
4125 .release = snd_pcm_release,
4126 .llseek = no_llseek,
4127 .poll = snd_pcm_poll,
4128 .unlocked_ioctl = snd_pcm_ioctl,
4129 .compat_ioctl = snd_pcm_ioctl_compat,
4130 .mmap = snd_pcm_mmap,
4131 .fasync = snd_pcm_fasync,
4132 .get_unmapped_area = snd_pcm_get_unmapped_area,
4133 },
4134 {
4135 .owner = THIS_MODULE,
4136 .read = snd_pcm_read,
4137 .read_iter = snd_pcm_readv,
4138 .open = snd_pcm_capture_open,
4139 .release = snd_pcm_release,
4140 .llseek = no_llseek,
4141 .poll = snd_pcm_poll,
4142 .unlocked_ioctl = snd_pcm_ioctl,
4143 .compat_ioctl = snd_pcm_ioctl_compat,
4144 .mmap = snd_pcm_mmap,
4145 .fasync = snd_pcm_fasync,
4146 .get_unmapped_area = snd_pcm_get_unmapped_area,
4147 }
4148};