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