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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 __free(kfree) = NULL;
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 return err;
251}
252
253/* macro for simplified cast */
254#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
255
256static bool hw_support_mmap(struct snd_pcm_substream *substream)
257{
258 struct snd_dma_buffer *dmabuf;
259
260 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
261 return false;
262
263 if (substream->ops->mmap || substream->ops->page)
264 return true;
265
266 dmabuf = snd_pcm_get_dma_buf(substream);
267 if (!dmabuf)
268 dmabuf = &substream->dma_buffer;
269 switch (dmabuf->dev.type) {
270 case SNDRV_DMA_TYPE_UNKNOWN:
271 /* we can't know the device, so just assume that the driver does
272 * everything right
273 */
274 return true;
275 case SNDRV_DMA_TYPE_CONTINUOUS:
276 case SNDRV_DMA_TYPE_VMALLOC:
277 return true;
278 default:
279 return dma_can_mmap(dmabuf->dev.dev);
280 }
281}
282
283static int constrain_mask_params(struct snd_pcm_substream *substream,
284 struct snd_pcm_hw_params *params)
285{
286 struct snd_pcm_hw_constraints *constrs =
287 &substream->runtime->hw_constraints;
288 struct snd_mask *m;
289 unsigned int k;
290 struct snd_mask old_mask __maybe_unused;
291 int changed;
292
293 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
294 m = hw_param_mask(params, k);
295 if (snd_mask_empty(m))
296 return -EINVAL;
297
298 /* This parameter is not requested to change by a caller. */
299 if (!(params->rmask & PARAM_MASK_BIT(k)))
300 continue;
301
302 if (trace_hw_mask_param_enabled())
303 old_mask = *m;
304
305 changed = snd_mask_refine(m, constrs_mask(constrs, k));
306 if (changed < 0)
307 return changed;
308 if (changed == 0)
309 continue;
310
311 /* Set corresponding flag so that the caller gets it. */
312 trace_hw_mask_param(substream, k, 0, &old_mask, m);
313 params->cmask |= PARAM_MASK_BIT(k);
314 }
315
316 return 0;
317}
318
319static int constrain_interval_params(struct snd_pcm_substream *substream,
320 struct snd_pcm_hw_params *params)
321{
322 struct snd_pcm_hw_constraints *constrs =
323 &substream->runtime->hw_constraints;
324 struct snd_interval *i;
325 unsigned int k;
326 struct snd_interval old_interval __maybe_unused;
327 int changed;
328
329 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
330 i = hw_param_interval(params, k);
331 if (snd_interval_empty(i))
332 return -EINVAL;
333
334 /* This parameter is not requested to change by a caller. */
335 if (!(params->rmask & PARAM_MASK_BIT(k)))
336 continue;
337
338 if (trace_hw_interval_param_enabled())
339 old_interval = *i;
340
341 changed = snd_interval_refine(i, constrs_interval(constrs, k));
342 if (changed < 0)
343 return changed;
344 if (changed == 0)
345 continue;
346
347 /* Set corresponding flag so that the caller gets it. */
348 trace_hw_interval_param(substream, k, 0, &old_interval, i);
349 params->cmask |= PARAM_MASK_BIT(k);
350 }
351
352 return 0;
353}
354
355static int constrain_params_by_rules(struct snd_pcm_substream *substream,
356 struct snd_pcm_hw_params *params)
357{
358 struct snd_pcm_hw_constraints *constrs =
359 &substream->runtime->hw_constraints;
360 unsigned int k;
361 unsigned int *rstamps __free(kfree) = NULL;
362 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
363 unsigned int stamp;
364 struct snd_pcm_hw_rule *r;
365 unsigned int d;
366 struct snd_mask old_mask __maybe_unused;
367 struct snd_interval old_interval __maybe_unused;
368 bool again;
369 int changed, err = 0;
370
371 /*
372 * Each application of rule has own sequence number.
373 *
374 * Each member of 'rstamps' array represents the sequence number of
375 * recent application of corresponding rule.
376 */
377 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
378 if (!rstamps)
379 return -ENOMEM;
380
381 /*
382 * Each member of 'vstamps' array represents the sequence number of
383 * recent application of rule in which corresponding parameters were
384 * changed.
385 *
386 * In initial state, elements corresponding to parameters requested by
387 * a caller is 1. For unrequested parameters, corresponding members
388 * have 0 so that the parameters are never changed anymore.
389 */
390 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
391 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
392
393 /* Due to the above design, actual sequence number starts at 2. */
394 stamp = 2;
395retry:
396 /* Apply all rules in order. */
397 again = false;
398 for (k = 0; k < constrs->rules_num; k++) {
399 r = &constrs->rules[k];
400
401 /*
402 * Check condition bits of this rule. When the rule has
403 * some condition bits, parameter without the bits is
404 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
405 * is an example of the condition bits.
406 */
407 if (r->cond && !(r->cond & params->flags))
408 continue;
409
410 /*
411 * The 'deps' array includes maximum four dependencies
412 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
413 * member of this array is a sentinel and should be
414 * negative value.
415 *
416 * This rule should be processed in this time when dependent
417 * parameters were changed at former applications of the other
418 * rules.
419 */
420 for (d = 0; r->deps[d] >= 0; d++) {
421 if (vstamps[r->deps[d]] > rstamps[k])
422 break;
423 }
424 if (r->deps[d] < 0)
425 continue;
426
427 if (trace_hw_mask_param_enabled()) {
428 if (hw_is_mask(r->var))
429 old_mask = *hw_param_mask(params, r->var);
430 }
431 if (trace_hw_interval_param_enabled()) {
432 if (hw_is_interval(r->var))
433 old_interval = *hw_param_interval(params, r->var);
434 }
435
436 changed = r->func(params, r);
437 if (changed < 0)
438 return changed;
439
440 /*
441 * When the parameter is changed, notify it to the caller
442 * by corresponding returned bit, then preparing for next
443 * iteration.
444 */
445 if (changed && r->var >= 0) {
446 if (hw_is_mask(r->var)) {
447 trace_hw_mask_param(substream, r->var,
448 k + 1, &old_mask,
449 hw_param_mask(params, r->var));
450 }
451 if (hw_is_interval(r->var)) {
452 trace_hw_interval_param(substream, r->var,
453 k + 1, &old_interval,
454 hw_param_interval(params, r->var));
455 }
456
457 params->cmask |= PARAM_MASK_BIT(r->var);
458 vstamps[r->var] = stamp;
459 again = true;
460 }
461
462 rstamps[k] = stamp++;
463 }
464
465 /* Iterate to evaluate all rules till no parameters are changed. */
466 if (again)
467 goto retry;
468
469 return err;
470}
471
472static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
473 struct snd_pcm_hw_params *params)
474{
475 const struct snd_interval *i;
476 const struct snd_mask *m;
477 struct snd_mask *m_rw;
478 int err;
479
480 if (!params->msbits) {
481 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
482 if (snd_interval_single(i))
483 params->msbits = snd_interval_value(i);
484 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
485 if (snd_mask_single(m)) {
486 snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
487 params->msbits = snd_pcm_format_width(format);
488 }
489 }
490
491 if (params->msbits) {
492 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
493 if (snd_mask_single(m)) {
494 snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
495
496 if (snd_pcm_format_linear(format) &&
497 snd_pcm_format_width(format) != params->msbits) {
498 m_rw = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
499 snd_mask_reset(m_rw,
500 (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
501 if (snd_mask_empty(m_rw))
502 return -EINVAL;
503 }
504 }
505 }
506
507 if (!params->rate_den) {
508 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
509 if (snd_interval_single(i)) {
510 params->rate_num = snd_interval_value(i);
511 params->rate_den = 1;
512 }
513 }
514
515 if (!params->fifo_size) {
516 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
517 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
518 if (snd_mask_single(m) && snd_interval_single(i)) {
519 err = snd_pcm_ops_ioctl(substream,
520 SNDRV_PCM_IOCTL1_FIFO_SIZE,
521 params);
522 if (err < 0)
523 return err;
524 }
525 }
526
527 if (!params->info) {
528 params->info = substream->runtime->hw.info;
529 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
530 SNDRV_PCM_INFO_DRAIN_TRIGGER);
531 if (!hw_support_mmap(substream))
532 params->info &= ~(SNDRV_PCM_INFO_MMAP |
533 SNDRV_PCM_INFO_MMAP_VALID);
534 }
535
536 return 0;
537}
538
539int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
540 struct snd_pcm_hw_params *params)
541{
542 int err;
543
544 params->info = 0;
545 params->fifo_size = 0;
546 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
547 params->msbits = 0;
548 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
549 params->rate_num = 0;
550 params->rate_den = 0;
551 }
552
553 err = constrain_mask_params(substream, params);
554 if (err < 0)
555 return err;
556
557 err = constrain_interval_params(substream, params);
558 if (err < 0)
559 return err;
560
561 err = constrain_params_by_rules(substream, params);
562 if (err < 0)
563 return err;
564
565 params->rmask = 0;
566
567 return 0;
568}
569EXPORT_SYMBOL(snd_pcm_hw_refine);
570
571static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
572 struct snd_pcm_hw_params __user * _params)
573{
574 struct snd_pcm_hw_params *params __free(kfree) = NULL;
575 int err;
576
577 params = memdup_user(_params, sizeof(*params));
578 if (IS_ERR(params))
579 return PTR_ERR(no_free_ptr(params));
580
581 err = snd_pcm_hw_refine(substream, params);
582 if (err < 0)
583 return err;
584
585 err = fixup_unreferenced_params(substream, params);
586 if (err < 0)
587 return err;
588
589 if (copy_to_user(_params, params, sizeof(*params)))
590 return -EFAULT;
591 return 0;
592}
593
594static int period_to_usecs(struct snd_pcm_runtime *runtime)
595{
596 int usecs;
597
598 if (! runtime->rate)
599 return -1; /* invalid */
600
601 /* take 75% of period time as the deadline */
602 usecs = (750000 / runtime->rate) * runtime->period_size;
603 usecs += ((750000 % runtime->rate) * runtime->period_size) /
604 runtime->rate;
605
606 return usecs;
607}
608
609static void snd_pcm_set_state(struct snd_pcm_substream *substream,
610 snd_pcm_state_t state)
611{
612 guard(pcm_stream_lock_irq)(substream);
613 if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
614 __snd_pcm_set_state(substream->runtime, state);
615}
616
617static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
618 int event)
619{
620#ifdef CONFIG_SND_PCM_TIMER
621 if (substream->timer)
622 snd_timer_notify(substream->timer, event,
623 &substream->runtime->trigger_tstamp);
624#endif
625}
626
627void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
628{
629 if (substream->runtime && substream->runtime->stop_operating) {
630 substream->runtime->stop_operating = false;
631 if (substream->ops && substream->ops->sync_stop)
632 substream->ops->sync_stop(substream);
633 else if (sync_irq && substream->pcm->card->sync_irq > 0)
634 synchronize_irq(substream->pcm->card->sync_irq);
635 }
636}
637
638/**
639 * snd_pcm_hw_params_choose - choose a configuration defined by @params
640 * @pcm: PCM instance
641 * @params: the hw_params instance
642 *
643 * Choose one configuration from configuration space defined by @params.
644 * The configuration chosen is that obtained fixing in this order:
645 * first access, first format, first subformat, min channels,
646 * min rate, min period time, max buffer size, min tick time
647 *
648 * Return: Zero if successful, or a negative error code on failure.
649 */
650static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
651 struct snd_pcm_hw_params *params)
652{
653 static const int vars[] = {
654 SNDRV_PCM_HW_PARAM_ACCESS,
655 SNDRV_PCM_HW_PARAM_FORMAT,
656 SNDRV_PCM_HW_PARAM_SUBFORMAT,
657 SNDRV_PCM_HW_PARAM_CHANNELS,
658 SNDRV_PCM_HW_PARAM_RATE,
659 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
660 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
661 SNDRV_PCM_HW_PARAM_TICK_TIME,
662 -1
663 };
664 const int *v;
665 struct snd_mask old_mask __maybe_unused;
666 struct snd_interval old_interval __maybe_unused;
667 int changed;
668
669 for (v = vars; *v != -1; v++) {
670 /* Keep old parameter to trace. */
671 if (trace_hw_mask_param_enabled()) {
672 if (hw_is_mask(*v))
673 old_mask = *hw_param_mask(params, *v);
674 }
675 if (trace_hw_interval_param_enabled()) {
676 if (hw_is_interval(*v))
677 old_interval = *hw_param_interval(params, *v);
678 }
679 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
680 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
681 else
682 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
683 if (changed < 0)
684 return changed;
685 if (changed == 0)
686 continue;
687
688 /* Trace the changed parameter. */
689 if (hw_is_mask(*v)) {
690 trace_hw_mask_param(pcm, *v, 0, &old_mask,
691 hw_param_mask(params, *v));
692 }
693 if (hw_is_interval(*v)) {
694 trace_hw_interval_param(pcm, *v, 0, &old_interval,
695 hw_param_interval(params, *v));
696 }
697 }
698
699 return 0;
700}
701
702/* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
703 * block the further r/w operations
704 */
705static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
706{
707 if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
708 return -EBUSY;
709 mutex_lock(&runtime->buffer_mutex);
710 return 0; /* keep buffer_mutex, unlocked by below */
711}
712
713/* release buffer_mutex and clear r/w access flag */
714static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
715{
716 mutex_unlock(&runtime->buffer_mutex);
717 atomic_inc(&runtime->buffer_accessing);
718}
719
720#if IS_ENABLED(CONFIG_SND_PCM_OSS)
721#define is_oss_stream(substream) ((substream)->oss.oss)
722#else
723#define is_oss_stream(substream) false
724#endif
725
726static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
727 struct snd_pcm_hw_params *params)
728{
729 struct snd_pcm_runtime *runtime;
730 int err, usecs;
731 unsigned int bits;
732 snd_pcm_uframes_t frames;
733
734 if (PCM_RUNTIME_CHECK(substream))
735 return -ENXIO;
736 runtime = substream->runtime;
737 err = snd_pcm_buffer_access_lock(runtime);
738 if (err < 0)
739 return err;
740 scoped_guard(pcm_stream_lock_irq, substream) {
741 switch (runtime->state) {
742 case SNDRV_PCM_STATE_OPEN:
743 case SNDRV_PCM_STATE_SETUP:
744 case SNDRV_PCM_STATE_PREPARED:
745 if (!is_oss_stream(substream) &&
746 atomic_read(&substream->mmap_count))
747 err = -EBADFD;
748 break;
749 default:
750 err = -EBADFD;
751 break;
752 }
753 }
754 if (err)
755 goto unlock;
756
757 snd_pcm_sync_stop(substream, true);
758
759 params->rmask = ~0U;
760 err = snd_pcm_hw_refine(substream, params);
761 if (err < 0)
762 goto _error;
763
764 err = snd_pcm_hw_params_choose(substream, params);
765 if (err < 0)
766 goto _error;
767
768 err = fixup_unreferenced_params(substream, params);
769 if (err < 0)
770 goto _error;
771
772 if (substream->managed_buffer_alloc) {
773 err = snd_pcm_lib_malloc_pages(substream,
774 params_buffer_bytes(params));
775 if (err < 0)
776 goto _error;
777 runtime->buffer_changed = err > 0;
778 }
779
780 if (substream->ops->hw_params != NULL) {
781 err = substream->ops->hw_params(substream, params);
782 if (err < 0)
783 goto _error;
784 }
785
786 runtime->access = params_access(params);
787 runtime->format = params_format(params);
788 runtime->subformat = params_subformat(params);
789 runtime->channels = params_channels(params);
790 runtime->rate = params_rate(params);
791 runtime->period_size = params_period_size(params);
792 runtime->periods = params_periods(params);
793 runtime->buffer_size = params_buffer_size(params);
794 runtime->info = params->info;
795 runtime->rate_num = params->rate_num;
796 runtime->rate_den = params->rate_den;
797 runtime->no_period_wakeup =
798 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
799 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
800
801 bits = snd_pcm_format_physical_width(runtime->format);
802 runtime->sample_bits = bits;
803 bits *= runtime->channels;
804 runtime->frame_bits = bits;
805 frames = 1;
806 while (bits % 8 != 0) {
807 bits *= 2;
808 frames *= 2;
809 }
810 runtime->byte_align = bits / 8;
811 runtime->min_align = frames;
812
813 /* Default sw params */
814 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
815 runtime->period_step = 1;
816 runtime->control->avail_min = runtime->period_size;
817 runtime->start_threshold = 1;
818 runtime->stop_threshold = runtime->buffer_size;
819 runtime->silence_threshold = 0;
820 runtime->silence_size = 0;
821 runtime->boundary = runtime->buffer_size;
822 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
823 runtime->boundary *= 2;
824
825 /* clear the buffer for avoiding possible kernel info leaks */
826 if (runtime->dma_area && !substream->ops->copy) {
827 size_t size = runtime->dma_bytes;
828
829 if (runtime->info & SNDRV_PCM_INFO_MMAP)
830 size = PAGE_ALIGN(size);
831 memset(runtime->dma_area, 0, size);
832 }
833
834 snd_pcm_timer_resolution_change(substream);
835 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
836
837 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
838 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
839 usecs = period_to_usecs(runtime);
840 if (usecs >= 0)
841 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
842 usecs);
843 err = 0;
844 _error:
845 if (err) {
846 /* hardware might be unusable from this time,
847 * so we force application to retry to set
848 * the correct hardware parameter settings
849 */
850 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
851 if (substream->ops->hw_free != NULL)
852 substream->ops->hw_free(substream);
853 if (substream->managed_buffer_alloc)
854 snd_pcm_lib_free_pages(substream);
855 }
856 unlock:
857 snd_pcm_buffer_access_unlock(runtime);
858 return err;
859}
860
861static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
862 struct snd_pcm_hw_params __user * _params)
863{
864 struct snd_pcm_hw_params *params __free(kfree) = NULL;
865 int err;
866
867 params = memdup_user(_params, sizeof(*params));
868 if (IS_ERR(params))
869 return PTR_ERR(no_free_ptr(params));
870
871 err = snd_pcm_hw_params(substream, params);
872 if (err < 0)
873 return err;
874
875 if (copy_to_user(_params, params, sizeof(*params)))
876 return -EFAULT;
877 return err;
878}
879
880static int do_hw_free(struct snd_pcm_substream *substream)
881{
882 int result = 0;
883
884 snd_pcm_sync_stop(substream, true);
885 if (substream->ops->hw_free)
886 result = substream->ops->hw_free(substream);
887 if (substream->managed_buffer_alloc)
888 snd_pcm_lib_free_pages(substream);
889 return result;
890}
891
892static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
893{
894 struct snd_pcm_runtime *runtime;
895 int result = 0;
896
897 if (PCM_RUNTIME_CHECK(substream))
898 return -ENXIO;
899 runtime = substream->runtime;
900 result = snd_pcm_buffer_access_lock(runtime);
901 if (result < 0)
902 return result;
903 scoped_guard(pcm_stream_lock_irq, substream) {
904 switch (runtime->state) {
905 case SNDRV_PCM_STATE_SETUP:
906 case SNDRV_PCM_STATE_PREPARED:
907 if (atomic_read(&substream->mmap_count))
908 result = -EBADFD;
909 break;
910 default:
911 result = -EBADFD;
912 break;
913 }
914 }
915 if (result)
916 goto unlock;
917 result = do_hw_free(substream);
918 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
919 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
920 unlock:
921 snd_pcm_buffer_access_unlock(runtime);
922 return result;
923}
924
925static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
926 struct snd_pcm_sw_params *params)
927{
928 struct snd_pcm_runtime *runtime;
929 int err;
930
931 if (PCM_RUNTIME_CHECK(substream))
932 return -ENXIO;
933 runtime = substream->runtime;
934 scoped_guard(pcm_stream_lock_irq, substream) {
935 if (runtime->state == SNDRV_PCM_STATE_OPEN)
936 return -EBADFD;
937 }
938
939 if (params->tstamp_mode < 0 ||
940 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
941 return -EINVAL;
942 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
943 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
944 return -EINVAL;
945 if (params->avail_min == 0)
946 return -EINVAL;
947 if (params->silence_size >= runtime->boundary) {
948 if (params->silence_threshold != 0)
949 return -EINVAL;
950 } else {
951 if (params->silence_size > params->silence_threshold)
952 return -EINVAL;
953 if (params->silence_threshold > runtime->buffer_size)
954 return -EINVAL;
955 }
956 err = 0;
957 scoped_guard(pcm_stream_lock_irq, substream) {
958 runtime->tstamp_mode = params->tstamp_mode;
959 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
960 runtime->tstamp_type = params->tstamp_type;
961 runtime->period_step = params->period_step;
962 runtime->control->avail_min = params->avail_min;
963 runtime->start_threshold = params->start_threshold;
964 runtime->stop_threshold = params->stop_threshold;
965 runtime->silence_threshold = params->silence_threshold;
966 runtime->silence_size = params->silence_size;
967 params->boundary = runtime->boundary;
968 if (snd_pcm_running(substream)) {
969 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
970 runtime->silence_size > 0)
971 snd_pcm_playback_silence(substream, ULONG_MAX);
972 err = snd_pcm_update_state(substream, runtime);
973 }
974 }
975 return err;
976}
977
978static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
979 struct snd_pcm_sw_params __user * _params)
980{
981 struct snd_pcm_sw_params params;
982 int err;
983 if (copy_from_user(¶ms, _params, sizeof(params)))
984 return -EFAULT;
985 err = snd_pcm_sw_params(substream, ¶ms);
986 if (copy_to_user(_params, ¶ms, sizeof(params)))
987 return -EFAULT;
988 return err;
989}
990
991static inline snd_pcm_uframes_t
992snd_pcm_calc_delay(struct snd_pcm_substream *substream)
993{
994 snd_pcm_uframes_t delay;
995
996 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
997 delay = snd_pcm_playback_hw_avail(substream->runtime);
998 else
999 delay = snd_pcm_capture_avail(substream->runtime);
1000 return delay + substream->runtime->delay;
1001}
1002
1003int snd_pcm_status64(struct snd_pcm_substream *substream,
1004 struct snd_pcm_status64 *status)
1005{
1006 struct snd_pcm_runtime *runtime = substream->runtime;
1007
1008 guard(pcm_stream_lock_irq)(substream);
1009
1010 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1011 &runtime->audio_tstamp_config);
1012
1013 /* backwards compatible behavior */
1014 if (runtime->audio_tstamp_config.type_requested ==
1015 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1016 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1017 runtime->audio_tstamp_config.type_requested =
1018 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1019 else
1020 runtime->audio_tstamp_config.type_requested =
1021 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1022 runtime->audio_tstamp_report.valid = 0;
1023 } else
1024 runtime->audio_tstamp_report.valid = 1;
1025
1026 status->state = runtime->state;
1027 status->suspended_state = runtime->suspended_state;
1028 if (status->state == SNDRV_PCM_STATE_OPEN)
1029 return 0;
1030 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1031 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1032 if (snd_pcm_running(substream)) {
1033 snd_pcm_update_hw_ptr(substream);
1034 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1035 status->tstamp_sec = runtime->status->tstamp.tv_sec;
1036 status->tstamp_nsec =
1037 runtime->status->tstamp.tv_nsec;
1038 status->driver_tstamp_sec =
1039 runtime->driver_tstamp.tv_sec;
1040 status->driver_tstamp_nsec =
1041 runtime->driver_tstamp.tv_nsec;
1042 status->audio_tstamp_sec =
1043 runtime->status->audio_tstamp.tv_sec;
1044 status->audio_tstamp_nsec =
1045 runtime->status->audio_tstamp.tv_nsec;
1046 if (runtime->audio_tstamp_report.valid == 1)
1047 /* backwards compatibility, no report provided in COMPAT mode */
1048 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1049 &status->audio_tstamp_accuracy,
1050 &runtime->audio_tstamp_report);
1051
1052 goto _tstamp_end;
1053 }
1054 } else {
1055 /* get tstamp only in fallback mode and only if enabled */
1056 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1057 struct timespec64 tstamp;
1058
1059 snd_pcm_gettime(runtime, &tstamp);
1060 status->tstamp_sec = tstamp.tv_sec;
1061 status->tstamp_nsec = tstamp.tv_nsec;
1062 }
1063 }
1064 _tstamp_end:
1065 status->appl_ptr = runtime->control->appl_ptr;
1066 status->hw_ptr = runtime->status->hw_ptr;
1067 status->avail = snd_pcm_avail(substream);
1068 status->delay = snd_pcm_running(substream) ?
1069 snd_pcm_calc_delay(substream) : 0;
1070 status->avail_max = runtime->avail_max;
1071 status->overrange = runtime->overrange;
1072 runtime->avail_max = 0;
1073 runtime->overrange = 0;
1074 return 0;
1075}
1076
1077static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1078 struct snd_pcm_status64 __user * _status,
1079 bool ext)
1080{
1081 struct snd_pcm_status64 status;
1082 int res;
1083
1084 memset(&status, 0, sizeof(status));
1085 /*
1086 * with extension, parameters are read/write,
1087 * get audio_tstamp_data from user,
1088 * ignore rest of status structure
1089 */
1090 if (ext && get_user(status.audio_tstamp_data,
1091 (u32 __user *)(&_status->audio_tstamp_data)))
1092 return -EFAULT;
1093 res = snd_pcm_status64(substream, &status);
1094 if (res < 0)
1095 return res;
1096 if (copy_to_user(_status, &status, sizeof(status)))
1097 return -EFAULT;
1098 return 0;
1099}
1100
1101static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1102 struct snd_pcm_status32 __user * _status,
1103 bool ext)
1104{
1105 struct snd_pcm_status64 status64;
1106 struct snd_pcm_status32 status32;
1107 int res;
1108
1109 memset(&status64, 0, sizeof(status64));
1110 memset(&status32, 0, sizeof(status32));
1111 /*
1112 * with extension, parameters are read/write,
1113 * get audio_tstamp_data from user,
1114 * ignore rest of status structure
1115 */
1116 if (ext && get_user(status64.audio_tstamp_data,
1117 (u32 __user *)(&_status->audio_tstamp_data)))
1118 return -EFAULT;
1119 res = snd_pcm_status64(substream, &status64);
1120 if (res < 0)
1121 return res;
1122
1123 status32 = (struct snd_pcm_status32) {
1124 .state = status64.state,
1125 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1126 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1127 .tstamp_sec = status64.tstamp_sec,
1128 .tstamp_nsec = status64.tstamp_nsec,
1129 .appl_ptr = status64.appl_ptr,
1130 .hw_ptr = status64.hw_ptr,
1131 .delay = status64.delay,
1132 .avail = status64.avail,
1133 .avail_max = status64.avail_max,
1134 .overrange = status64.overrange,
1135 .suspended_state = status64.suspended_state,
1136 .audio_tstamp_data = status64.audio_tstamp_data,
1137 .audio_tstamp_sec = status64.audio_tstamp_sec,
1138 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1139 .driver_tstamp_sec = status64.audio_tstamp_sec,
1140 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1141 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1142 };
1143
1144 if (copy_to_user(_status, &status32, sizeof(status32)))
1145 return -EFAULT;
1146
1147 return 0;
1148}
1149
1150static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1151 struct snd_pcm_channel_info * info)
1152{
1153 struct snd_pcm_runtime *runtime;
1154 unsigned int channel;
1155
1156 channel = info->channel;
1157 runtime = substream->runtime;
1158 scoped_guard(pcm_stream_lock_irq, substream) {
1159 if (runtime->state == SNDRV_PCM_STATE_OPEN)
1160 return -EBADFD;
1161 }
1162 if (channel >= runtime->channels)
1163 return -EINVAL;
1164 memset(info, 0, sizeof(*info));
1165 info->channel = channel;
1166 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1167}
1168
1169static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1170 struct snd_pcm_channel_info __user * _info)
1171{
1172 struct snd_pcm_channel_info info;
1173 int res;
1174
1175 if (copy_from_user(&info, _info, sizeof(info)))
1176 return -EFAULT;
1177 res = snd_pcm_channel_info(substream, &info);
1178 if (res < 0)
1179 return res;
1180 if (copy_to_user(_info, &info, sizeof(info)))
1181 return -EFAULT;
1182 return 0;
1183}
1184
1185static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1186{
1187 struct snd_pcm_runtime *runtime = substream->runtime;
1188 if (runtime->trigger_master == NULL)
1189 return;
1190 if (runtime->trigger_master == substream) {
1191 if (!runtime->trigger_tstamp_latched)
1192 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1193 } else {
1194 snd_pcm_trigger_tstamp(runtime->trigger_master);
1195 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1196 }
1197 runtime->trigger_master = NULL;
1198}
1199
1200#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
1201
1202struct action_ops {
1203 int (*pre_action)(struct snd_pcm_substream *substream,
1204 snd_pcm_state_t state);
1205 int (*do_action)(struct snd_pcm_substream *substream,
1206 snd_pcm_state_t state);
1207 void (*undo_action)(struct snd_pcm_substream *substream,
1208 snd_pcm_state_t state);
1209 void (*post_action)(struct snd_pcm_substream *substream,
1210 snd_pcm_state_t state);
1211};
1212
1213/*
1214 * this functions is core for handling of linked stream
1215 * Note: the stream state might be changed also on failure
1216 * Note2: call with calling stream lock + link lock
1217 */
1218static int snd_pcm_action_group(const struct action_ops *ops,
1219 struct snd_pcm_substream *substream,
1220 snd_pcm_state_t state,
1221 bool stream_lock)
1222{
1223 struct snd_pcm_substream *s = NULL;
1224 struct snd_pcm_substream *s1;
1225 int res = 0, depth = 1;
1226
1227 snd_pcm_group_for_each_entry(s, substream) {
1228 if (s != substream) {
1229 if (!stream_lock)
1230 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1231 else if (s->pcm->nonatomic)
1232 mutex_lock_nested(&s->self_group.mutex, depth);
1233 else
1234 spin_lock_nested(&s->self_group.lock, depth);
1235 depth++;
1236 }
1237 res = ops->pre_action(s, state);
1238 if (res < 0)
1239 goto _unlock;
1240 }
1241 snd_pcm_group_for_each_entry(s, substream) {
1242 res = ops->do_action(s, state);
1243 if (res < 0) {
1244 if (ops->undo_action) {
1245 snd_pcm_group_for_each_entry(s1, substream) {
1246 if (s1 == s) /* failed stream */
1247 break;
1248 ops->undo_action(s1, state);
1249 }
1250 }
1251 s = NULL; /* unlock all */
1252 goto _unlock;
1253 }
1254 }
1255 snd_pcm_group_for_each_entry(s, substream) {
1256 ops->post_action(s, state);
1257 }
1258 _unlock:
1259 /* unlock streams */
1260 snd_pcm_group_for_each_entry(s1, substream) {
1261 if (s1 != substream) {
1262 if (!stream_lock)
1263 mutex_unlock(&s1->runtime->buffer_mutex);
1264 else if (s1->pcm->nonatomic)
1265 mutex_unlock(&s1->self_group.mutex);
1266 else
1267 spin_unlock(&s1->self_group.lock);
1268 }
1269 if (s1 == s) /* end */
1270 break;
1271 }
1272 return res;
1273}
1274
1275/*
1276 * Note: call with stream lock
1277 */
1278static int snd_pcm_action_single(const struct action_ops *ops,
1279 struct snd_pcm_substream *substream,
1280 snd_pcm_state_t state)
1281{
1282 int res;
1283
1284 res = ops->pre_action(substream, state);
1285 if (res < 0)
1286 return res;
1287 res = ops->do_action(substream, state);
1288 if (res == 0)
1289 ops->post_action(substream, state);
1290 else if (ops->undo_action)
1291 ops->undo_action(substream, state);
1292 return res;
1293}
1294
1295static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1296 struct snd_pcm_group *new_group)
1297{
1298 substream->group = new_group;
1299 list_move(&substream->link_list, &new_group->substreams);
1300}
1301
1302/*
1303 * Unref and unlock the group, but keep the stream lock;
1304 * when the group becomes empty and no longer referred, destroy itself
1305 */
1306static void snd_pcm_group_unref(struct snd_pcm_group *group,
1307 struct snd_pcm_substream *substream)
1308{
1309 bool do_free;
1310
1311 if (!group)
1312 return;
1313 do_free = refcount_dec_and_test(&group->refs);
1314 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1315 if (do_free)
1316 kfree(group);
1317}
1318
1319/*
1320 * Lock the group inside a stream lock and reference it;
1321 * return the locked group object, or NULL if not linked
1322 */
1323static struct snd_pcm_group *
1324snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1325{
1326 bool nonatomic = substream->pcm->nonatomic;
1327 struct snd_pcm_group *group;
1328 bool trylock;
1329
1330 for (;;) {
1331 if (!snd_pcm_stream_linked(substream))
1332 return NULL;
1333 group = substream->group;
1334 /* block freeing the group object */
1335 refcount_inc(&group->refs);
1336
1337 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1338 spin_trylock(&group->lock);
1339 if (trylock)
1340 break; /* OK */
1341
1342 /* re-lock for avoiding ABBA deadlock */
1343 snd_pcm_stream_unlock(substream);
1344 snd_pcm_group_lock(group, nonatomic);
1345 snd_pcm_stream_lock(substream);
1346
1347 /* check the group again; the above opens a small race window */
1348 if (substream->group == group)
1349 break; /* OK */
1350 /* group changed, try again */
1351 snd_pcm_group_unref(group, substream);
1352 }
1353 return group;
1354}
1355
1356/*
1357 * Note: call with stream lock
1358 */
1359static int snd_pcm_action(const struct action_ops *ops,
1360 struct snd_pcm_substream *substream,
1361 snd_pcm_state_t state)
1362{
1363 struct snd_pcm_group *group;
1364 int res;
1365
1366 group = snd_pcm_stream_group_ref(substream);
1367 if (group)
1368 res = snd_pcm_action_group(ops, substream, state, true);
1369 else
1370 res = snd_pcm_action_single(ops, substream, state);
1371 snd_pcm_group_unref(group, substream);
1372 return res;
1373}
1374
1375/*
1376 * Note: don't use any locks before
1377 */
1378static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1379 struct snd_pcm_substream *substream,
1380 snd_pcm_state_t state)
1381{
1382 guard(pcm_stream_lock_irq)(substream);
1383 return snd_pcm_action(ops, substream, state);
1384}
1385
1386/*
1387 */
1388static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1389 struct snd_pcm_substream *substream,
1390 snd_pcm_state_t state)
1391{
1392 int res;
1393
1394 /* Guarantee the group members won't change during non-atomic action */
1395 guard(rwsem_read)(&snd_pcm_link_rwsem);
1396 res = snd_pcm_buffer_access_lock(substream->runtime);
1397 if (res < 0)
1398 return res;
1399 if (snd_pcm_stream_linked(substream))
1400 res = snd_pcm_action_group(ops, substream, state, false);
1401 else
1402 res = snd_pcm_action_single(ops, substream, state);
1403 snd_pcm_buffer_access_unlock(substream->runtime);
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 guard(pcm_stream_lock_irqsave)(substream);
1574 if (substream->runtime && snd_pcm_running(substream))
1575 __snd_pcm_xrun(substream);
1576 return 0;
1577}
1578EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1579
1580/*
1581 * pause callbacks: pass boolean (to start pause or resume) as state argument
1582 */
1583#define pause_pushed(state) (__force bool)(state)
1584
1585static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1586 snd_pcm_state_t state)
1587{
1588 struct snd_pcm_runtime *runtime = substream->runtime;
1589 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1590 return -ENOSYS;
1591 if (pause_pushed(state)) {
1592 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1593 return -EBADFD;
1594 } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1595 return -EBADFD;
1596 runtime->trigger_master = substream;
1597 return 0;
1598}
1599
1600static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1601 snd_pcm_state_t state)
1602{
1603 if (substream->runtime->trigger_master != substream)
1604 return 0;
1605 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1606 * a delta between the current jiffies, this gives a large enough
1607 * delta, effectively to skip the check once.
1608 */
1609 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1610 return substream->ops->trigger(substream,
1611 pause_pushed(state) ?
1612 SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1613 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1614}
1615
1616static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1617 snd_pcm_state_t state)
1618{
1619 if (substream->runtime->trigger_master == substream)
1620 substream->ops->trigger(substream,
1621 pause_pushed(state) ?
1622 SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1623 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1624}
1625
1626static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1627 snd_pcm_state_t state)
1628{
1629 struct snd_pcm_runtime *runtime = substream->runtime;
1630 snd_pcm_trigger_tstamp(substream);
1631 if (pause_pushed(state)) {
1632 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1633 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1634 wake_up(&runtime->sleep);
1635 wake_up(&runtime->tsleep);
1636 } else {
1637 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1638 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1639 }
1640}
1641
1642static const struct action_ops snd_pcm_action_pause = {
1643 .pre_action = snd_pcm_pre_pause,
1644 .do_action = snd_pcm_do_pause,
1645 .undo_action = snd_pcm_undo_pause,
1646 .post_action = snd_pcm_post_pause
1647};
1648
1649/*
1650 * Push/release the pause for all linked streams.
1651 */
1652static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1653{
1654 return snd_pcm_action(&snd_pcm_action_pause, substream,
1655 (__force snd_pcm_state_t)push);
1656}
1657
1658static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1659 bool push)
1660{
1661 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1662 (__force snd_pcm_state_t)push);
1663}
1664
1665#ifdef CONFIG_PM
1666/* suspend callback: state argument ignored */
1667
1668static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1669 snd_pcm_state_t state)
1670{
1671 struct snd_pcm_runtime *runtime = substream->runtime;
1672 switch (runtime->state) {
1673 case SNDRV_PCM_STATE_SUSPENDED:
1674 return -EBUSY;
1675 /* unresumable PCM state; return -EBUSY for skipping suspend */
1676 case SNDRV_PCM_STATE_OPEN:
1677 case SNDRV_PCM_STATE_SETUP:
1678 case SNDRV_PCM_STATE_DISCONNECTED:
1679 return -EBUSY;
1680 }
1681 runtime->trigger_master = substream;
1682 return 0;
1683}
1684
1685static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1686 snd_pcm_state_t state)
1687{
1688 struct snd_pcm_runtime *runtime = substream->runtime;
1689 if (runtime->trigger_master != substream)
1690 return 0;
1691 if (! snd_pcm_running(substream))
1692 return 0;
1693 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1694 runtime->stop_operating = true;
1695 return 0; /* suspend unconditionally */
1696}
1697
1698static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1699 snd_pcm_state_t state)
1700{
1701 struct snd_pcm_runtime *runtime = substream->runtime;
1702 snd_pcm_trigger_tstamp(substream);
1703 runtime->suspended_state = runtime->state;
1704 runtime->status->suspended_state = runtime->suspended_state;
1705 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1706 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1707 wake_up(&runtime->sleep);
1708 wake_up(&runtime->tsleep);
1709}
1710
1711static const struct action_ops snd_pcm_action_suspend = {
1712 .pre_action = snd_pcm_pre_suspend,
1713 .do_action = snd_pcm_do_suspend,
1714 .post_action = snd_pcm_post_suspend
1715};
1716
1717/*
1718 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1719 * @substream: the PCM substream
1720 *
1721 * After this call, all streams are changed to SUSPENDED state.
1722 *
1723 * Return: Zero if successful, or a negative error code.
1724 */
1725static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1726{
1727 guard(pcm_stream_lock_irqsave)(substream);
1728 return snd_pcm_action(&snd_pcm_action_suspend, substream,
1729 ACTION_ARG_IGNORE);
1730}
1731
1732/**
1733 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1734 * @pcm: the PCM instance
1735 *
1736 * After this call, all streams are changed to SUSPENDED state.
1737 *
1738 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1739 */
1740int snd_pcm_suspend_all(struct snd_pcm *pcm)
1741{
1742 struct snd_pcm_substream *substream;
1743 int stream, err = 0;
1744
1745 if (! pcm)
1746 return 0;
1747
1748 for_each_pcm_substream(pcm, stream, substream) {
1749 /* FIXME: the open/close code should lock this as well */
1750 if (!substream->runtime)
1751 continue;
1752
1753 /*
1754 * Skip BE dai link PCM's that are internal and may
1755 * not have their substream ops set.
1756 */
1757 if (!substream->ops)
1758 continue;
1759
1760 err = snd_pcm_suspend(substream);
1761 if (err < 0 && err != -EBUSY)
1762 return err;
1763 }
1764
1765 for_each_pcm_substream(pcm, stream, substream)
1766 snd_pcm_sync_stop(substream, false);
1767
1768 return 0;
1769}
1770EXPORT_SYMBOL(snd_pcm_suspend_all);
1771
1772/* resume callbacks: state argument ignored */
1773
1774static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1775 snd_pcm_state_t state)
1776{
1777 struct snd_pcm_runtime *runtime = substream->runtime;
1778 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1779 return -ENOSYS;
1780 runtime->trigger_master = substream;
1781 return 0;
1782}
1783
1784static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1785 snd_pcm_state_t state)
1786{
1787 struct snd_pcm_runtime *runtime = substream->runtime;
1788 if (runtime->trigger_master != substream)
1789 return 0;
1790 /* DMA not running previously? */
1791 if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1792 (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1793 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1794 return 0;
1795 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1796}
1797
1798static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1799 snd_pcm_state_t state)
1800{
1801 if (substream->runtime->trigger_master == substream &&
1802 snd_pcm_running(substream))
1803 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1804}
1805
1806static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1807 snd_pcm_state_t state)
1808{
1809 struct snd_pcm_runtime *runtime = substream->runtime;
1810 snd_pcm_trigger_tstamp(substream);
1811 __snd_pcm_set_state(runtime, runtime->suspended_state);
1812 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1813}
1814
1815static const struct action_ops snd_pcm_action_resume = {
1816 .pre_action = snd_pcm_pre_resume,
1817 .do_action = snd_pcm_do_resume,
1818 .undo_action = snd_pcm_undo_resume,
1819 .post_action = snd_pcm_post_resume
1820};
1821
1822static int snd_pcm_resume(struct snd_pcm_substream *substream)
1823{
1824 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1825 ACTION_ARG_IGNORE);
1826}
1827
1828#else
1829
1830static int snd_pcm_resume(struct snd_pcm_substream *substream)
1831{
1832 return -ENOSYS;
1833}
1834
1835#endif /* CONFIG_PM */
1836
1837/*
1838 * xrun ioctl
1839 *
1840 * Change the RUNNING stream(s) to XRUN state.
1841 */
1842static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1843{
1844 struct snd_pcm_runtime *runtime = substream->runtime;
1845
1846 guard(pcm_stream_lock_irq)(substream);
1847 switch (runtime->state) {
1848 case SNDRV_PCM_STATE_XRUN:
1849 return 0; /* already there */
1850 case SNDRV_PCM_STATE_RUNNING:
1851 __snd_pcm_xrun(substream);
1852 return 0;
1853 default:
1854 return -EBADFD;
1855 }
1856}
1857
1858/*
1859 * reset ioctl
1860 */
1861/* reset callbacks: state argument ignored */
1862static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1863 snd_pcm_state_t state)
1864{
1865 struct snd_pcm_runtime *runtime = substream->runtime;
1866 switch (runtime->state) {
1867 case SNDRV_PCM_STATE_RUNNING:
1868 case SNDRV_PCM_STATE_PREPARED:
1869 case SNDRV_PCM_STATE_PAUSED:
1870 case SNDRV_PCM_STATE_SUSPENDED:
1871 return 0;
1872 default:
1873 return -EBADFD;
1874 }
1875}
1876
1877static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1878 snd_pcm_state_t state)
1879{
1880 struct snd_pcm_runtime *runtime = substream->runtime;
1881 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1882 if (err < 0)
1883 return err;
1884 guard(pcm_stream_lock_irq)(substream);
1885 runtime->hw_ptr_base = 0;
1886 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1887 runtime->status->hw_ptr % runtime->period_size;
1888 runtime->silence_start = runtime->status->hw_ptr;
1889 runtime->silence_filled = 0;
1890 return 0;
1891}
1892
1893static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1894 snd_pcm_state_t state)
1895{
1896 struct snd_pcm_runtime *runtime = substream->runtime;
1897 guard(pcm_stream_lock_irq)(substream);
1898 runtime->control->appl_ptr = runtime->status->hw_ptr;
1899 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1900 runtime->silence_size > 0)
1901 snd_pcm_playback_silence(substream, ULONG_MAX);
1902}
1903
1904static const struct action_ops snd_pcm_action_reset = {
1905 .pre_action = snd_pcm_pre_reset,
1906 .do_action = snd_pcm_do_reset,
1907 .post_action = snd_pcm_post_reset
1908};
1909
1910static int snd_pcm_reset(struct snd_pcm_substream *substream)
1911{
1912 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1913 ACTION_ARG_IGNORE);
1914}
1915
1916/*
1917 * prepare ioctl
1918 */
1919/* pass f_flags as state argument */
1920static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1921 snd_pcm_state_t state)
1922{
1923 struct snd_pcm_runtime *runtime = substream->runtime;
1924 int f_flags = (__force int)state;
1925
1926 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1927 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1928 return -EBADFD;
1929 if (snd_pcm_running(substream))
1930 return -EBUSY;
1931 substream->f_flags = f_flags;
1932 return 0;
1933}
1934
1935static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1936 snd_pcm_state_t state)
1937{
1938 int err;
1939 snd_pcm_sync_stop(substream, true);
1940 err = substream->ops->prepare(substream);
1941 if (err < 0)
1942 return err;
1943 return snd_pcm_do_reset(substream, state);
1944}
1945
1946static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1947 snd_pcm_state_t state)
1948{
1949 struct snd_pcm_runtime *runtime = substream->runtime;
1950 runtime->control->appl_ptr = runtime->status->hw_ptr;
1951 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1952}
1953
1954static const struct action_ops snd_pcm_action_prepare = {
1955 .pre_action = snd_pcm_pre_prepare,
1956 .do_action = snd_pcm_do_prepare,
1957 .post_action = snd_pcm_post_prepare
1958};
1959
1960/**
1961 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1962 * @substream: the PCM substream instance
1963 * @file: file to refer f_flags
1964 *
1965 * Return: Zero if successful, or a negative error code.
1966 */
1967static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1968 struct file *file)
1969{
1970 int f_flags;
1971
1972 if (file)
1973 f_flags = file->f_flags;
1974 else
1975 f_flags = substream->f_flags;
1976
1977 scoped_guard(pcm_stream_lock_irq, substream) {
1978 switch (substream->runtime->state) {
1979 case SNDRV_PCM_STATE_PAUSED:
1980 snd_pcm_pause(substream, false);
1981 fallthrough;
1982 case SNDRV_PCM_STATE_SUSPENDED:
1983 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1984 break;
1985 }
1986 }
1987
1988 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1989 substream,
1990 (__force snd_pcm_state_t)f_flags);
1991}
1992
1993/*
1994 * drain ioctl
1995 */
1996
1997/* drain init callbacks: state argument ignored */
1998static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
1999 snd_pcm_state_t state)
2000{
2001 struct snd_pcm_runtime *runtime = substream->runtime;
2002 switch (runtime->state) {
2003 case SNDRV_PCM_STATE_OPEN:
2004 case SNDRV_PCM_STATE_DISCONNECTED:
2005 case SNDRV_PCM_STATE_SUSPENDED:
2006 return -EBADFD;
2007 }
2008 runtime->trigger_master = substream;
2009 return 0;
2010}
2011
2012static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2013 snd_pcm_state_t state)
2014{
2015 struct snd_pcm_runtime *runtime = substream->runtime;
2016 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2017 switch (runtime->state) {
2018 case SNDRV_PCM_STATE_PREPARED:
2019 /* start playback stream if possible */
2020 if (! snd_pcm_playback_empty(substream)) {
2021 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2022 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2023 } else {
2024 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2025 }
2026 break;
2027 case SNDRV_PCM_STATE_RUNNING:
2028 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2029 break;
2030 case SNDRV_PCM_STATE_XRUN:
2031 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2032 break;
2033 default:
2034 break;
2035 }
2036 } else {
2037 /* stop running stream */
2038 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2039 snd_pcm_state_t new_state;
2040
2041 new_state = snd_pcm_capture_avail(runtime) > 0 ?
2042 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2043 snd_pcm_do_stop(substream, new_state);
2044 snd_pcm_post_stop(substream, new_state);
2045 }
2046 }
2047
2048 if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2049 runtime->trigger_master == substream &&
2050 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2051 return substream->ops->trigger(substream,
2052 SNDRV_PCM_TRIGGER_DRAIN);
2053
2054 return 0;
2055}
2056
2057static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2058 snd_pcm_state_t state)
2059{
2060}
2061
2062static const struct action_ops snd_pcm_action_drain_init = {
2063 .pre_action = snd_pcm_pre_drain_init,
2064 .do_action = snd_pcm_do_drain_init,
2065 .post_action = snd_pcm_post_drain_init
2066};
2067
2068/*
2069 * Drain the stream(s).
2070 * When the substream is linked, sync until the draining of all playback streams
2071 * is finished.
2072 * After this call, all streams are supposed to be either SETUP or DRAINING
2073 * (capture only) state.
2074 */
2075static int snd_pcm_drain(struct snd_pcm_substream *substream,
2076 struct file *file)
2077{
2078 struct snd_card *card;
2079 struct snd_pcm_runtime *runtime;
2080 struct snd_pcm_substream *s;
2081 struct snd_pcm_group *group;
2082 wait_queue_entry_t wait;
2083 int result = 0;
2084 int nonblock = 0;
2085
2086 card = substream->pcm->card;
2087 runtime = substream->runtime;
2088
2089 if (runtime->state == SNDRV_PCM_STATE_OPEN)
2090 return -EBADFD;
2091
2092 if (file) {
2093 if (file->f_flags & O_NONBLOCK)
2094 nonblock = 1;
2095 } else if (substream->f_flags & O_NONBLOCK)
2096 nonblock = 1;
2097
2098 snd_pcm_stream_lock_irq(substream);
2099 /* resume pause */
2100 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2101 snd_pcm_pause(substream, false);
2102
2103 /* pre-start/stop - all running streams are changed to DRAINING state */
2104 result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2105 ACTION_ARG_IGNORE);
2106 if (result < 0)
2107 goto unlock;
2108 /* in non-blocking, we don't wait in ioctl but let caller poll */
2109 if (nonblock) {
2110 result = -EAGAIN;
2111 goto unlock;
2112 }
2113
2114 for (;;) {
2115 long tout;
2116 struct snd_pcm_runtime *to_check;
2117 if (signal_pending(current)) {
2118 result = -ERESTARTSYS;
2119 break;
2120 }
2121 /* find a substream to drain */
2122 to_check = NULL;
2123 group = snd_pcm_stream_group_ref(substream);
2124 snd_pcm_group_for_each_entry(s, substream) {
2125 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2126 continue;
2127 runtime = s->runtime;
2128 if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2129 to_check = runtime;
2130 break;
2131 }
2132 }
2133 snd_pcm_group_unref(group, substream);
2134 if (!to_check)
2135 break; /* all drained */
2136 init_waitqueue_entry(&wait, current);
2137 set_current_state(TASK_INTERRUPTIBLE);
2138 add_wait_queue(&to_check->sleep, &wait);
2139 snd_pcm_stream_unlock_irq(substream);
2140 if (runtime->no_period_wakeup)
2141 tout = MAX_SCHEDULE_TIMEOUT;
2142 else {
2143 tout = 100;
2144 if (runtime->rate) {
2145 long t = runtime->buffer_size * 1100 / runtime->rate;
2146 tout = max(t, tout);
2147 }
2148 tout = msecs_to_jiffies(tout);
2149 }
2150 tout = schedule_timeout(tout);
2151
2152 snd_pcm_stream_lock_irq(substream);
2153 group = snd_pcm_stream_group_ref(substream);
2154 snd_pcm_group_for_each_entry(s, substream) {
2155 if (s->runtime == to_check) {
2156 remove_wait_queue(&to_check->sleep, &wait);
2157 break;
2158 }
2159 }
2160 snd_pcm_group_unref(group, substream);
2161
2162 if (card->shutdown) {
2163 result = -ENODEV;
2164 break;
2165 }
2166 if (tout == 0) {
2167 if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2168 result = -ESTRPIPE;
2169 else {
2170 dev_dbg(substream->pcm->card->dev,
2171 "playback drain timeout (DMA or IRQ trouble?)\n");
2172 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2173 result = -EIO;
2174 }
2175 break;
2176 }
2177 }
2178
2179 unlock:
2180 snd_pcm_stream_unlock_irq(substream);
2181
2182 return result;
2183}
2184
2185/*
2186 * drop ioctl
2187 *
2188 * Immediately put all linked substreams into SETUP state.
2189 */
2190static int snd_pcm_drop(struct snd_pcm_substream *substream)
2191{
2192 struct snd_pcm_runtime *runtime;
2193 int result = 0;
2194
2195 if (PCM_RUNTIME_CHECK(substream))
2196 return -ENXIO;
2197 runtime = substream->runtime;
2198
2199 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2200 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2201 return -EBADFD;
2202
2203 guard(pcm_stream_lock_irq)(substream);
2204 /* resume pause */
2205 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2206 snd_pcm_pause(substream, false);
2207
2208 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2209 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2210
2211 return result;
2212}
2213
2214
2215static bool is_pcm_file(struct file *file)
2216{
2217 struct inode *inode = file_inode(file);
2218 struct snd_pcm *pcm;
2219 unsigned int minor;
2220
2221 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2222 return false;
2223 minor = iminor(inode);
2224 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2225 if (!pcm)
2226 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2227 if (!pcm)
2228 return false;
2229 snd_card_unref(pcm->card);
2230 return true;
2231}
2232
2233/*
2234 * PCM link handling
2235 */
2236static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2237{
2238 struct snd_pcm_file *pcm_file;
2239 struct snd_pcm_substream *substream1;
2240 struct snd_pcm_group *group __free(kfree) = NULL;
2241 struct snd_pcm_group *target_group;
2242 bool nonatomic = substream->pcm->nonatomic;
2243 CLASS(fd, f)(fd);
2244
2245 if (!f.file)
2246 return -EBADFD;
2247 if (!is_pcm_file(f.file))
2248 return -EBADFD;
2249
2250 pcm_file = f.file->private_data;
2251 substream1 = pcm_file->substream;
2252
2253 if (substream == substream1)
2254 return -EINVAL;
2255
2256 group = kzalloc(sizeof(*group), GFP_KERNEL);
2257 if (!group)
2258 return -ENOMEM;
2259 snd_pcm_group_init(group);
2260
2261 guard(rwsem_write)(&snd_pcm_link_rwsem);
2262 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2263 substream->runtime->state != substream1->runtime->state ||
2264 substream->pcm->nonatomic != substream1->pcm->nonatomic)
2265 return -EBADFD;
2266 if (snd_pcm_stream_linked(substream1))
2267 return -EALREADY;
2268
2269 scoped_guard(pcm_stream_lock_irq, substream) {
2270 if (!snd_pcm_stream_linked(substream)) {
2271 snd_pcm_group_assign(substream, group);
2272 group = NULL; /* assigned, don't free this one below */
2273 }
2274 target_group = substream->group;
2275 }
2276
2277 snd_pcm_group_lock_irq(target_group, nonatomic);
2278 snd_pcm_stream_lock_nested(substream1);
2279 snd_pcm_group_assign(substream1, target_group);
2280 refcount_inc(&target_group->refs);
2281 snd_pcm_stream_unlock(substream1);
2282 snd_pcm_group_unlock_irq(target_group, nonatomic);
2283 return 0;
2284}
2285
2286static void relink_to_local(struct snd_pcm_substream *substream)
2287{
2288 snd_pcm_stream_lock_nested(substream);
2289 snd_pcm_group_assign(substream, &substream->self_group);
2290 snd_pcm_stream_unlock(substream);
2291}
2292
2293static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2294{
2295 struct snd_pcm_group *group;
2296 bool nonatomic = substream->pcm->nonatomic;
2297 bool do_free = false;
2298
2299 guard(rwsem_write)(&snd_pcm_link_rwsem);
2300
2301 if (!snd_pcm_stream_linked(substream))
2302 return -EALREADY;
2303
2304 group = substream->group;
2305 snd_pcm_group_lock_irq(group, nonatomic);
2306
2307 relink_to_local(substream);
2308 refcount_dec(&group->refs);
2309
2310 /* detach the last stream, too */
2311 if (list_is_singular(&group->substreams)) {
2312 relink_to_local(list_first_entry(&group->substreams,
2313 struct snd_pcm_substream,
2314 link_list));
2315 do_free = refcount_dec_and_test(&group->refs);
2316 }
2317
2318 snd_pcm_group_unlock_irq(group, nonatomic);
2319 if (do_free)
2320 kfree(group);
2321 return 0;
2322}
2323
2324/*
2325 * hw configurator
2326 */
2327static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2328 struct snd_pcm_hw_rule *rule)
2329{
2330 struct snd_interval t;
2331 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2332 hw_param_interval_c(params, rule->deps[1]), &t);
2333 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2334}
2335
2336static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2337 struct snd_pcm_hw_rule *rule)
2338{
2339 struct snd_interval t;
2340 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2341 hw_param_interval_c(params, rule->deps[1]), &t);
2342 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2343}
2344
2345static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2346 struct snd_pcm_hw_rule *rule)
2347{
2348 struct snd_interval t;
2349 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2350 hw_param_interval_c(params, rule->deps[1]),
2351 (unsigned long) rule->private, &t);
2352 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2353}
2354
2355static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2356 struct snd_pcm_hw_rule *rule)
2357{
2358 struct snd_interval t;
2359 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2360 (unsigned long) rule->private,
2361 hw_param_interval_c(params, rule->deps[1]), &t);
2362 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2363}
2364
2365static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2366 struct snd_pcm_hw_rule *rule)
2367{
2368 snd_pcm_format_t k;
2369 const struct snd_interval *i =
2370 hw_param_interval_c(params, rule->deps[0]);
2371 struct snd_mask m;
2372 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2373 snd_mask_any(&m);
2374 pcm_for_each_format(k) {
2375 int bits;
2376 if (!snd_mask_test_format(mask, k))
2377 continue;
2378 bits = snd_pcm_format_physical_width(k);
2379 if (bits <= 0)
2380 continue; /* ignore invalid formats */
2381 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2382 snd_mask_reset(&m, (__force unsigned)k);
2383 }
2384 return snd_mask_refine(mask, &m);
2385}
2386
2387static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2388 struct snd_pcm_hw_rule *rule)
2389{
2390 struct snd_interval t;
2391 snd_pcm_format_t k;
2392
2393 t.min = UINT_MAX;
2394 t.max = 0;
2395 t.openmin = 0;
2396 t.openmax = 0;
2397 pcm_for_each_format(k) {
2398 int bits;
2399 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2400 continue;
2401 bits = snd_pcm_format_physical_width(k);
2402 if (bits <= 0)
2403 continue; /* ignore invalid formats */
2404 if (t.min > (unsigned)bits)
2405 t.min = bits;
2406 if (t.max < (unsigned)bits)
2407 t.max = bits;
2408 }
2409 t.integer = 1;
2410 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2411}
2412
2413#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2414#error "Change this table"
2415#endif
2416
2417static const unsigned int rates[] = {
2418 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2419 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2420};
2421
2422const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2423 .count = ARRAY_SIZE(rates),
2424 .list = rates,
2425};
2426
2427static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2428 struct snd_pcm_hw_rule *rule)
2429{
2430 struct snd_pcm_hardware *hw = rule->private;
2431 return snd_interval_list(hw_param_interval(params, rule->var),
2432 snd_pcm_known_rates.count,
2433 snd_pcm_known_rates.list, hw->rates);
2434}
2435
2436static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2437 struct snd_pcm_hw_rule *rule)
2438{
2439 struct snd_interval t;
2440 struct snd_pcm_substream *substream = rule->private;
2441 t.min = 0;
2442 t.max = substream->buffer_bytes_max;
2443 t.openmin = 0;
2444 t.openmax = 0;
2445 t.integer = 1;
2446 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2447}
2448
2449static int snd_pcm_hw_rule_subformats(struct snd_pcm_hw_params *params,
2450 struct snd_pcm_hw_rule *rule)
2451{
2452 struct snd_mask *sfmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
2453 struct snd_mask *fmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2454 u32 *subformats = rule->private;
2455 snd_pcm_format_t f;
2456 struct snd_mask m;
2457
2458 snd_mask_none(&m);
2459 /* All PCMs support at least the default STD subformat. */
2460 snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_STD);
2461
2462 pcm_for_each_format(f) {
2463 if (!snd_mask_test(fmask, (__force unsigned)f))
2464 continue;
2465
2466 if (f == SNDRV_PCM_FORMAT_S32_LE && *subformats)
2467 m.bits[0] |= *subformats;
2468 else if (snd_pcm_format_linear(f))
2469 snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
2470 }
2471
2472 return snd_mask_refine(sfmask, &m);
2473}
2474
2475static int snd_pcm_hw_constraint_subformats(struct snd_pcm_runtime *runtime,
2476 unsigned int cond, u32 *subformats)
2477{
2478 return snd_pcm_hw_rule_add(runtime, cond, -1,
2479 snd_pcm_hw_rule_subformats, (void *)subformats,
2480 SNDRV_PCM_HW_PARAM_SUBFORMAT,
2481 SNDRV_PCM_HW_PARAM_FORMAT, -1);
2482}
2483
2484static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2485{
2486 struct snd_pcm_runtime *runtime = substream->runtime;
2487 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2488 int k, err;
2489
2490 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2491 snd_mask_any(constrs_mask(constrs, k));
2492 }
2493
2494 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2495 snd_interval_any(constrs_interval(constrs, k));
2496 }
2497
2498 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2499 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2500 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2501 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2502 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2503
2504 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2505 snd_pcm_hw_rule_format, NULL,
2506 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2507 if (err < 0)
2508 return err;
2509 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2510 snd_pcm_hw_rule_sample_bits, NULL,
2511 SNDRV_PCM_HW_PARAM_FORMAT,
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_div, NULL,
2517 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2518 if (err < 0)
2519 return err;
2520 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2521 snd_pcm_hw_rule_mul, NULL,
2522 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2523 if (err < 0)
2524 return err;
2525 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2526 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2527 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2528 if (err < 0)
2529 return err;
2530 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2531 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2532 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2533 if (err < 0)
2534 return err;
2535 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2536 snd_pcm_hw_rule_div, NULL,
2537 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2538 if (err < 0)
2539 return err;
2540 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2541 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2542 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2543 if (err < 0)
2544 return err;
2545 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2546 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2547 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2548 if (err < 0)
2549 return err;
2550 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2551 snd_pcm_hw_rule_div, NULL,
2552 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2553 if (err < 0)
2554 return err;
2555 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2556 snd_pcm_hw_rule_div, NULL,
2557 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2558 if (err < 0)
2559 return err;
2560 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2561 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2562 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2563 if (err < 0)
2564 return err;
2565 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2566 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2567 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2568 if (err < 0)
2569 return err;
2570 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2571 snd_pcm_hw_rule_mul, NULL,
2572 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2573 if (err < 0)
2574 return err;
2575 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2576 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2577 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2578 if (err < 0)
2579 return err;
2580 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2581 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2582 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2583 if (err < 0)
2584 return err;
2585 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2586 snd_pcm_hw_rule_muldivk, (void*) 8,
2587 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2588 if (err < 0)
2589 return err;
2590 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2591 snd_pcm_hw_rule_muldivk, (void*) 8,
2592 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2593 if (err < 0)
2594 return err;
2595 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2596 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2597 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2598 if (err < 0)
2599 return err;
2600 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2601 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2602 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2603 if (err < 0)
2604 return err;
2605 return 0;
2606}
2607
2608static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2609{
2610 struct snd_pcm_runtime *runtime = substream->runtime;
2611 struct snd_pcm_hardware *hw = &runtime->hw;
2612 int err;
2613 unsigned int mask = 0;
2614
2615 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2616 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2617 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2618 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2619 if (hw_support_mmap(substream)) {
2620 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2621 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2622 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2623 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2624 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2625 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2626 }
2627 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2628 if (err < 0)
2629 return err;
2630
2631 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2632 if (err < 0)
2633 return err;
2634
2635 err = snd_pcm_hw_constraint_subformats(runtime, 0, &hw->subformats);
2636 if (err < 0)
2637 return err;
2638
2639 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2640 hw->channels_min, hw->channels_max);
2641 if (err < 0)
2642 return err;
2643
2644 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2645 hw->rate_min, hw->rate_max);
2646 if (err < 0)
2647 return err;
2648
2649 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2650 hw->period_bytes_min, hw->period_bytes_max);
2651 if (err < 0)
2652 return err;
2653
2654 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2655 hw->periods_min, hw->periods_max);
2656 if (err < 0)
2657 return err;
2658
2659 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2660 hw->period_bytes_min, hw->buffer_bytes_max);
2661 if (err < 0)
2662 return err;
2663
2664 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2665 snd_pcm_hw_rule_buffer_bytes_max, substream,
2666 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2667 if (err < 0)
2668 return err;
2669
2670 /* FIXME: remove */
2671 if (runtime->dma_bytes) {
2672 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2673 if (err < 0)
2674 return err;
2675 }
2676
2677 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2678 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2679 snd_pcm_hw_rule_rate, hw,
2680 SNDRV_PCM_HW_PARAM_RATE, -1);
2681 if (err < 0)
2682 return err;
2683 }
2684
2685 /* FIXME: this belong to lowlevel */
2686 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2687
2688 return 0;
2689}
2690
2691static void pcm_release_private(struct snd_pcm_substream *substream)
2692{
2693 if (snd_pcm_stream_linked(substream))
2694 snd_pcm_unlink(substream);
2695}
2696
2697void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2698{
2699 substream->ref_count--;
2700 if (substream->ref_count > 0)
2701 return;
2702
2703 snd_pcm_drop(substream);
2704 if (substream->hw_opened) {
2705 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2706 do_hw_free(substream);
2707 substream->ops->close(substream);
2708 substream->hw_opened = 0;
2709 }
2710 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2711 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2712 if (substream->pcm_release) {
2713 substream->pcm_release(substream);
2714 substream->pcm_release = NULL;
2715 }
2716 snd_pcm_detach_substream(substream);
2717}
2718EXPORT_SYMBOL(snd_pcm_release_substream);
2719
2720int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2721 struct file *file,
2722 struct snd_pcm_substream **rsubstream)
2723{
2724 struct snd_pcm_substream *substream;
2725 int err;
2726
2727 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2728 if (err < 0)
2729 return err;
2730 if (substream->ref_count > 1) {
2731 *rsubstream = substream;
2732 return 0;
2733 }
2734
2735 err = snd_pcm_hw_constraints_init(substream);
2736 if (err < 0) {
2737 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2738 goto error;
2739 }
2740
2741 err = substream->ops->open(substream);
2742 if (err < 0)
2743 goto error;
2744
2745 substream->hw_opened = 1;
2746
2747 err = snd_pcm_hw_constraints_complete(substream);
2748 if (err < 0) {
2749 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2750 goto error;
2751 }
2752
2753 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2754 * the DMA buffer requires it
2755 */
2756 if (substream->managed_buffer_alloc &&
2757 substream->dma_buffer.dev.need_sync)
2758 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2759
2760 *rsubstream = substream;
2761 return 0;
2762
2763 error:
2764 snd_pcm_release_substream(substream);
2765 return err;
2766}
2767EXPORT_SYMBOL(snd_pcm_open_substream);
2768
2769static int snd_pcm_open_file(struct file *file,
2770 struct snd_pcm *pcm,
2771 int stream)
2772{
2773 struct snd_pcm_file *pcm_file;
2774 struct snd_pcm_substream *substream;
2775 int err;
2776
2777 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2778 if (err < 0)
2779 return err;
2780
2781 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2782 if (pcm_file == NULL) {
2783 snd_pcm_release_substream(substream);
2784 return -ENOMEM;
2785 }
2786 pcm_file->substream = substream;
2787 if (substream->ref_count == 1)
2788 substream->pcm_release = pcm_release_private;
2789 file->private_data = pcm_file;
2790
2791 return 0;
2792}
2793
2794static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2795{
2796 struct snd_pcm *pcm;
2797 int err = nonseekable_open(inode, file);
2798 if (err < 0)
2799 return err;
2800 pcm = snd_lookup_minor_data(iminor(inode),
2801 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2802 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2803 if (pcm)
2804 snd_card_unref(pcm->card);
2805 return err;
2806}
2807
2808static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2809{
2810 struct snd_pcm *pcm;
2811 int err = nonseekable_open(inode, file);
2812 if (err < 0)
2813 return err;
2814 pcm = snd_lookup_minor_data(iminor(inode),
2815 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2816 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2817 if (pcm)
2818 snd_card_unref(pcm->card);
2819 return err;
2820}
2821
2822static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2823{
2824 int err;
2825 wait_queue_entry_t wait;
2826
2827 if (pcm == NULL) {
2828 err = -ENODEV;
2829 goto __error1;
2830 }
2831 err = snd_card_file_add(pcm->card, file);
2832 if (err < 0)
2833 goto __error1;
2834 if (!try_module_get(pcm->card->module)) {
2835 err = -EFAULT;
2836 goto __error2;
2837 }
2838 init_waitqueue_entry(&wait, current);
2839 add_wait_queue(&pcm->open_wait, &wait);
2840 mutex_lock(&pcm->open_mutex);
2841 while (1) {
2842 err = snd_pcm_open_file(file, pcm, stream);
2843 if (err >= 0)
2844 break;
2845 if (err == -EAGAIN) {
2846 if (file->f_flags & O_NONBLOCK) {
2847 err = -EBUSY;
2848 break;
2849 }
2850 } else
2851 break;
2852 set_current_state(TASK_INTERRUPTIBLE);
2853 mutex_unlock(&pcm->open_mutex);
2854 schedule();
2855 mutex_lock(&pcm->open_mutex);
2856 if (pcm->card->shutdown) {
2857 err = -ENODEV;
2858 break;
2859 }
2860 if (signal_pending(current)) {
2861 err = -ERESTARTSYS;
2862 break;
2863 }
2864 }
2865 remove_wait_queue(&pcm->open_wait, &wait);
2866 mutex_unlock(&pcm->open_mutex);
2867 if (err < 0)
2868 goto __error;
2869 return err;
2870
2871 __error:
2872 module_put(pcm->card->module);
2873 __error2:
2874 snd_card_file_remove(pcm->card, file);
2875 __error1:
2876 return err;
2877}
2878
2879static int snd_pcm_release(struct inode *inode, struct file *file)
2880{
2881 struct snd_pcm *pcm;
2882 struct snd_pcm_substream *substream;
2883 struct snd_pcm_file *pcm_file;
2884
2885 pcm_file = file->private_data;
2886 substream = pcm_file->substream;
2887 if (snd_BUG_ON(!substream))
2888 return -ENXIO;
2889 pcm = substream->pcm;
2890
2891 /* block until the device gets woken up as it may touch the hardware */
2892 snd_power_wait(pcm->card);
2893
2894 scoped_guard(mutex, &pcm->open_mutex) {
2895 snd_pcm_release_substream(substream);
2896 kfree(pcm_file);
2897 }
2898 wake_up(&pcm->open_wait);
2899 module_put(pcm->card->module);
2900 snd_card_file_remove(pcm->card, file);
2901 return 0;
2902}
2903
2904/* check and update PCM state; return 0 or a negative error
2905 * call this inside PCM lock
2906 */
2907static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2908{
2909 switch (substream->runtime->state) {
2910 case SNDRV_PCM_STATE_DRAINING:
2911 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2912 return -EBADFD;
2913 fallthrough;
2914 case SNDRV_PCM_STATE_RUNNING:
2915 return snd_pcm_update_hw_ptr(substream);
2916 case SNDRV_PCM_STATE_PREPARED:
2917 case SNDRV_PCM_STATE_PAUSED:
2918 return 0;
2919 case SNDRV_PCM_STATE_SUSPENDED:
2920 return -ESTRPIPE;
2921 case SNDRV_PCM_STATE_XRUN:
2922 return -EPIPE;
2923 default:
2924 return -EBADFD;
2925 }
2926}
2927
2928/* increase the appl_ptr; returns the processed frames or a negative error */
2929static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2930 snd_pcm_uframes_t frames,
2931 snd_pcm_sframes_t avail)
2932{
2933 struct snd_pcm_runtime *runtime = substream->runtime;
2934 snd_pcm_sframes_t appl_ptr;
2935 int ret;
2936
2937 if (avail <= 0)
2938 return 0;
2939 if (frames > (snd_pcm_uframes_t)avail)
2940 frames = avail;
2941 appl_ptr = runtime->control->appl_ptr + frames;
2942 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2943 appl_ptr -= runtime->boundary;
2944 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2945 return ret < 0 ? ret : frames;
2946}
2947
2948/* decrease the appl_ptr; returns the processed frames or zero for error */
2949static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2950 snd_pcm_uframes_t frames,
2951 snd_pcm_sframes_t avail)
2952{
2953 struct snd_pcm_runtime *runtime = substream->runtime;
2954 snd_pcm_sframes_t appl_ptr;
2955 int ret;
2956
2957 if (avail <= 0)
2958 return 0;
2959 if (frames > (snd_pcm_uframes_t)avail)
2960 frames = avail;
2961 appl_ptr = runtime->control->appl_ptr - frames;
2962 if (appl_ptr < 0)
2963 appl_ptr += runtime->boundary;
2964 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2965 /* NOTE: we return zero for errors because PulseAudio gets depressed
2966 * upon receiving an error from rewind ioctl and stops processing
2967 * any longer. Returning zero means that no rewind is done, so
2968 * it's not absolutely wrong to answer like that.
2969 */
2970 return ret < 0 ? 0 : frames;
2971}
2972
2973static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2974 snd_pcm_uframes_t frames)
2975{
2976 snd_pcm_sframes_t ret;
2977
2978 if (frames == 0)
2979 return 0;
2980
2981 scoped_guard(pcm_stream_lock_irq, substream) {
2982 ret = do_pcm_hwsync(substream);
2983 if (!ret)
2984 ret = rewind_appl_ptr(substream, frames,
2985 snd_pcm_hw_avail(substream));
2986 }
2987 if (ret >= 0)
2988 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2989 return ret;
2990}
2991
2992static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2993 snd_pcm_uframes_t frames)
2994{
2995 snd_pcm_sframes_t ret;
2996
2997 if (frames == 0)
2998 return 0;
2999
3000 scoped_guard(pcm_stream_lock_irq, substream) {
3001 ret = do_pcm_hwsync(substream);
3002 if (!ret)
3003 ret = forward_appl_ptr(substream, frames,
3004 snd_pcm_avail(substream));
3005 }
3006 if (ret >= 0)
3007 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3008 return ret;
3009}
3010
3011static int snd_pcm_delay(struct snd_pcm_substream *substream,
3012 snd_pcm_sframes_t *delay)
3013{
3014 int err;
3015
3016 scoped_guard(pcm_stream_lock_irq, substream) {
3017 err = do_pcm_hwsync(substream);
3018 if (delay && !err)
3019 *delay = snd_pcm_calc_delay(substream);
3020 }
3021 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3022
3023 return err;
3024}
3025
3026static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3027{
3028 return snd_pcm_delay(substream, NULL);
3029}
3030
3031static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3032 struct snd_pcm_sync_ptr __user *_sync_ptr)
3033{
3034 struct snd_pcm_runtime *runtime = substream->runtime;
3035 struct snd_pcm_sync_ptr sync_ptr;
3036 volatile struct snd_pcm_mmap_status *status;
3037 volatile struct snd_pcm_mmap_control *control;
3038 int err;
3039
3040 memset(&sync_ptr, 0, sizeof(sync_ptr));
3041 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3042 return -EFAULT;
3043 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3044 return -EFAULT;
3045 status = runtime->status;
3046 control = runtime->control;
3047 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3048 err = snd_pcm_hwsync(substream);
3049 if (err < 0)
3050 return err;
3051 }
3052 scoped_guard(pcm_stream_lock_irq, substream) {
3053 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3054 err = pcm_lib_apply_appl_ptr(substream,
3055 sync_ptr.c.control.appl_ptr);
3056 if (err < 0)
3057 return err;
3058 } else {
3059 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3060 }
3061 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3062 control->avail_min = sync_ptr.c.control.avail_min;
3063 else
3064 sync_ptr.c.control.avail_min = control->avail_min;
3065 sync_ptr.s.status.state = status->state;
3066 sync_ptr.s.status.hw_ptr = status->hw_ptr;
3067 sync_ptr.s.status.tstamp = status->tstamp;
3068 sync_ptr.s.status.suspended_state = status->suspended_state;
3069 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3070 }
3071 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3072 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3073 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3074 return -EFAULT;
3075 return 0;
3076}
3077
3078struct snd_pcm_mmap_status32 {
3079 snd_pcm_state_t state;
3080 s32 pad1;
3081 u32 hw_ptr;
3082 s32 tstamp_sec;
3083 s32 tstamp_nsec;
3084 snd_pcm_state_t suspended_state;
3085 s32 audio_tstamp_sec;
3086 s32 audio_tstamp_nsec;
3087} __packed;
3088
3089struct snd_pcm_mmap_control32 {
3090 u32 appl_ptr;
3091 u32 avail_min;
3092};
3093
3094struct snd_pcm_sync_ptr32 {
3095 u32 flags;
3096 union {
3097 struct snd_pcm_mmap_status32 status;
3098 unsigned char reserved[64];
3099 } s;
3100 union {
3101 struct snd_pcm_mmap_control32 control;
3102 unsigned char reserved[64];
3103 } c;
3104} __packed;
3105
3106/* recalcuate the boundary within 32bit */
3107static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3108{
3109 snd_pcm_uframes_t boundary;
3110
3111 if (! runtime->buffer_size)
3112 return 0;
3113 boundary = runtime->buffer_size;
3114 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3115 boundary *= 2;
3116 return boundary;
3117}
3118
3119static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3120 struct snd_pcm_sync_ptr32 __user *src)
3121{
3122 struct snd_pcm_runtime *runtime = substream->runtime;
3123 volatile struct snd_pcm_mmap_status *status;
3124 volatile struct snd_pcm_mmap_control *control;
3125 u32 sflags;
3126 struct snd_pcm_mmap_control scontrol;
3127 struct snd_pcm_mmap_status sstatus;
3128 snd_pcm_uframes_t boundary;
3129 int err;
3130
3131 if (snd_BUG_ON(!runtime))
3132 return -EINVAL;
3133
3134 if (get_user(sflags, &src->flags) ||
3135 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3136 get_user(scontrol.avail_min, &src->c.control.avail_min))
3137 return -EFAULT;
3138 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3139 err = snd_pcm_hwsync(substream);
3140 if (err < 0)
3141 return err;
3142 }
3143 status = runtime->status;
3144 control = runtime->control;
3145 boundary = recalculate_boundary(runtime);
3146 if (! boundary)
3147 boundary = 0x7fffffff;
3148 scoped_guard(pcm_stream_lock_irq, substream) {
3149 /* FIXME: we should consider the boundary for the sync from app */
3150 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3151 err = pcm_lib_apply_appl_ptr(substream,
3152 scontrol.appl_ptr);
3153 if (err < 0)
3154 return err;
3155 } else
3156 scontrol.appl_ptr = control->appl_ptr % boundary;
3157 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3158 control->avail_min = scontrol.avail_min;
3159 else
3160 scontrol.avail_min = control->avail_min;
3161 sstatus.state = status->state;
3162 sstatus.hw_ptr = status->hw_ptr % boundary;
3163 sstatus.tstamp = status->tstamp;
3164 sstatus.suspended_state = status->suspended_state;
3165 sstatus.audio_tstamp = status->audio_tstamp;
3166 }
3167 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3168 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3169 if (put_user(sstatus.state, &src->s.status.state) ||
3170 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3171 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3172 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3173 put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3174 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3175 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3176 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3177 put_user(scontrol.avail_min, &src->c.control.avail_min))
3178 return -EFAULT;
3179
3180 return 0;
3181}
3182#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3183
3184static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3185{
3186 struct snd_pcm_runtime *runtime = substream->runtime;
3187 int arg;
3188
3189 if (get_user(arg, _arg))
3190 return -EFAULT;
3191 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3192 return -EINVAL;
3193 runtime->tstamp_type = arg;
3194 return 0;
3195}
3196
3197static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3198 struct snd_xferi __user *_xferi)
3199{
3200 struct snd_xferi xferi;
3201 struct snd_pcm_runtime *runtime = substream->runtime;
3202 snd_pcm_sframes_t result;
3203
3204 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3205 return -EBADFD;
3206 if (put_user(0, &_xferi->result))
3207 return -EFAULT;
3208 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3209 return -EFAULT;
3210 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3211 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3212 else
3213 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3214 if (put_user(result, &_xferi->result))
3215 return -EFAULT;
3216 return result < 0 ? result : 0;
3217}
3218
3219static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3220 struct snd_xfern __user *_xfern)
3221{
3222 struct snd_xfern xfern;
3223 struct snd_pcm_runtime *runtime = substream->runtime;
3224 void *bufs __free(kfree) = NULL;
3225 snd_pcm_sframes_t result;
3226
3227 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3228 return -EBADFD;
3229 if (runtime->channels > 128)
3230 return -EINVAL;
3231 if (put_user(0, &_xfern->result))
3232 return -EFAULT;
3233 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3234 return -EFAULT;
3235
3236 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3237 if (IS_ERR(bufs))
3238 return PTR_ERR(no_free_ptr(bufs));
3239 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3240 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3241 else
3242 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3243 if (put_user(result, &_xfern->result))
3244 return -EFAULT;
3245 return result < 0 ? result : 0;
3246}
3247
3248static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3249 snd_pcm_uframes_t __user *_frames)
3250{
3251 snd_pcm_uframes_t frames;
3252 snd_pcm_sframes_t result;
3253
3254 if (get_user(frames, _frames))
3255 return -EFAULT;
3256 if (put_user(0, _frames))
3257 return -EFAULT;
3258 result = snd_pcm_rewind(substream, frames);
3259 if (put_user(result, _frames))
3260 return -EFAULT;
3261 return result < 0 ? result : 0;
3262}
3263
3264static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3265 snd_pcm_uframes_t __user *_frames)
3266{
3267 snd_pcm_uframes_t frames;
3268 snd_pcm_sframes_t result;
3269
3270 if (get_user(frames, _frames))
3271 return -EFAULT;
3272 if (put_user(0, _frames))
3273 return -EFAULT;
3274 result = snd_pcm_forward(substream, frames);
3275 if (put_user(result, _frames))
3276 return -EFAULT;
3277 return result < 0 ? result : 0;
3278}
3279
3280static int snd_pcm_common_ioctl(struct file *file,
3281 struct snd_pcm_substream *substream,
3282 unsigned int cmd, void __user *arg)
3283{
3284 struct snd_pcm_file *pcm_file = file->private_data;
3285 int res;
3286
3287 if (PCM_RUNTIME_CHECK(substream))
3288 return -ENXIO;
3289
3290 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3291 return -EBADFD;
3292
3293 res = snd_power_wait(substream->pcm->card);
3294 if (res < 0)
3295 return res;
3296
3297 switch (cmd) {
3298 case SNDRV_PCM_IOCTL_PVERSION:
3299 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3300 case SNDRV_PCM_IOCTL_INFO:
3301 return snd_pcm_info_user(substream, arg);
3302 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
3303 return 0;
3304 case SNDRV_PCM_IOCTL_TTSTAMP:
3305 return snd_pcm_tstamp(substream, arg);
3306 case SNDRV_PCM_IOCTL_USER_PVERSION:
3307 if (get_user(pcm_file->user_pversion,
3308 (unsigned int __user *)arg))
3309 return -EFAULT;
3310 return 0;
3311 case SNDRV_PCM_IOCTL_HW_REFINE:
3312 return snd_pcm_hw_refine_user(substream, arg);
3313 case SNDRV_PCM_IOCTL_HW_PARAMS:
3314 return snd_pcm_hw_params_user(substream, arg);
3315 case SNDRV_PCM_IOCTL_HW_FREE:
3316 return snd_pcm_hw_free(substream);
3317 case SNDRV_PCM_IOCTL_SW_PARAMS:
3318 return snd_pcm_sw_params_user(substream, arg);
3319 case SNDRV_PCM_IOCTL_STATUS32:
3320 return snd_pcm_status_user32(substream, arg, false);
3321 case SNDRV_PCM_IOCTL_STATUS_EXT32:
3322 return snd_pcm_status_user32(substream, arg, true);
3323 case SNDRV_PCM_IOCTL_STATUS64:
3324 return snd_pcm_status_user64(substream, arg, false);
3325 case SNDRV_PCM_IOCTL_STATUS_EXT64:
3326 return snd_pcm_status_user64(substream, arg, true);
3327 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3328 return snd_pcm_channel_info_user(substream, arg);
3329 case SNDRV_PCM_IOCTL_PREPARE:
3330 return snd_pcm_prepare(substream, file);
3331 case SNDRV_PCM_IOCTL_RESET:
3332 return snd_pcm_reset(substream);
3333 case SNDRV_PCM_IOCTL_START:
3334 return snd_pcm_start_lock_irq(substream);
3335 case SNDRV_PCM_IOCTL_LINK:
3336 return snd_pcm_link(substream, (int)(unsigned long) arg);
3337 case SNDRV_PCM_IOCTL_UNLINK:
3338 return snd_pcm_unlink(substream);
3339 case SNDRV_PCM_IOCTL_RESUME:
3340 return snd_pcm_resume(substream);
3341 case SNDRV_PCM_IOCTL_XRUN:
3342 return snd_pcm_xrun(substream);
3343 case SNDRV_PCM_IOCTL_HWSYNC:
3344 return snd_pcm_hwsync(substream);
3345 case SNDRV_PCM_IOCTL_DELAY:
3346 {
3347 snd_pcm_sframes_t delay = 0;
3348 snd_pcm_sframes_t __user *res = arg;
3349 int err;
3350
3351 err = snd_pcm_delay(substream, &delay);
3352 if (err)
3353 return err;
3354 if (put_user(delay, res))
3355 return -EFAULT;
3356 return 0;
3357 }
3358 case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3359 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3360 case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3361 return snd_pcm_sync_ptr(substream, arg);
3362#ifdef CONFIG_SND_SUPPORT_OLD_API
3363 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3364 return snd_pcm_hw_refine_old_user(substream, arg);
3365 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3366 return snd_pcm_hw_params_old_user(substream, arg);
3367#endif
3368 case SNDRV_PCM_IOCTL_DRAIN:
3369 return snd_pcm_drain(substream, file);
3370 case SNDRV_PCM_IOCTL_DROP:
3371 return snd_pcm_drop(substream);
3372 case SNDRV_PCM_IOCTL_PAUSE:
3373 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3374 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3375 case SNDRV_PCM_IOCTL_READI_FRAMES:
3376 return snd_pcm_xferi_frames_ioctl(substream, arg);
3377 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3378 case SNDRV_PCM_IOCTL_READN_FRAMES:
3379 return snd_pcm_xfern_frames_ioctl(substream, arg);
3380 case SNDRV_PCM_IOCTL_REWIND:
3381 return snd_pcm_rewind_ioctl(substream, arg);
3382 case SNDRV_PCM_IOCTL_FORWARD:
3383 return snd_pcm_forward_ioctl(substream, arg);
3384 }
3385 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3386 return -ENOTTY;
3387}
3388
3389static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3390 unsigned long arg)
3391{
3392 struct snd_pcm_file *pcm_file;
3393
3394 pcm_file = file->private_data;
3395
3396 if (((cmd >> 8) & 0xff) != 'A')
3397 return -ENOTTY;
3398
3399 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3400 (void __user *)arg);
3401}
3402
3403/**
3404 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3405 * @substream: PCM substream
3406 * @cmd: IOCTL cmd
3407 * @arg: IOCTL argument
3408 *
3409 * The function is provided primarily for OSS layer and USB gadget drivers,
3410 * and it allows only the limited set of ioctls (hw_params, sw_params,
3411 * prepare, start, drain, drop, forward).
3412 *
3413 * Return: zero if successful, or a negative error code
3414 */
3415int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3416 unsigned int cmd, void *arg)
3417{
3418 snd_pcm_uframes_t *frames = arg;
3419 snd_pcm_sframes_t result;
3420
3421 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3422 return -EBADFD;
3423
3424 switch (cmd) {
3425 case SNDRV_PCM_IOCTL_FORWARD:
3426 {
3427 /* provided only for OSS; capture-only and no value returned */
3428 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3429 return -EINVAL;
3430 result = snd_pcm_forward(substream, *frames);
3431 return result < 0 ? result : 0;
3432 }
3433 case SNDRV_PCM_IOCTL_HW_PARAMS:
3434 return snd_pcm_hw_params(substream, arg);
3435 case SNDRV_PCM_IOCTL_SW_PARAMS:
3436 return snd_pcm_sw_params(substream, arg);
3437 case SNDRV_PCM_IOCTL_PREPARE:
3438 return snd_pcm_prepare(substream, NULL);
3439 case SNDRV_PCM_IOCTL_START:
3440 return snd_pcm_start_lock_irq(substream);
3441 case SNDRV_PCM_IOCTL_DRAIN:
3442 return snd_pcm_drain(substream, NULL);
3443 case SNDRV_PCM_IOCTL_DROP:
3444 return snd_pcm_drop(substream);
3445 case SNDRV_PCM_IOCTL_DELAY:
3446 return snd_pcm_delay(substream, frames);
3447 default:
3448 return -EINVAL;
3449 }
3450}
3451EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3452
3453static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3454 loff_t * offset)
3455{
3456 struct snd_pcm_file *pcm_file;
3457 struct snd_pcm_substream *substream;
3458 struct snd_pcm_runtime *runtime;
3459 snd_pcm_sframes_t result;
3460
3461 pcm_file = file->private_data;
3462 substream = pcm_file->substream;
3463 if (PCM_RUNTIME_CHECK(substream))
3464 return -ENXIO;
3465 runtime = substream->runtime;
3466 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3467 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3468 return -EBADFD;
3469 if (!frame_aligned(runtime, count))
3470 return -EINVAL;
3471 count = bytes_to_frames(runtime, count);
3472 result = snd_pcm_lib_read(substream, buf, count);
3473 if (result > 0)
3474 result = frames_to_bytes(runtime, result);
3475 return result;
3476}
3477
3478static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3479 size_t count, loff_t * offset)
3480{
3481 struct snd_pcm_file *pcm_file;
3482 struct snd_pcm_substream *substream;
3483 struct snd_pcm_runtime *runtime;
3484 snd_pcm_sframes_t result;
3485
3486 pcm_file = file->private_data;
3487 substream = pcm_file->substream;
3488 if (PCM_RUNTIME_CHECK(substream))
3489 return -ENXIO;
3490 runtime = substream->runtime;
3491 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3492 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3493 return -EBADFD;
3494 if (!frame_aligned(runtime, count))
3495 return -EINVAL;
3496 count = bytes_to_frames(runtime, count);
3497 result = snd_pcm_lib_write(substream, buf, count);
3498 if (result > 0)
3499 result = frames_to_bytes(runtime, result);
3500 return result;
3501}
3502
3503static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3504{
3505 struct snd_pcm_file *pcm_file;
3506 struct snd_pcm_substream *substream;
3507 struct snd_pcm_runtime *runtime;
3508 snd_pcm_sframes_t result;
3509 unsigned long i;
3510 void __user **bufs __free(kfree) = NULL;
3511 snd_pcm_uframes_t frames;
3512 const struct iovec *iov = iter_iov(to);
3513
3514 pcm_file = iocb->ki_filp->private_data;
3515 substream = pcm_file->substream;
3516 if (PCM_RUNTIME_CHECK(substream))
3517 return -ENXIO;
3518 runtime = substream->runtime;
3519 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3520 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3521 return -EBADFD;
3522 if (!user_backed_iter(to))
3523 return -EINVAL;
3524 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3525 return -EINVAL;
3526 if (!frame_aligned(runtime, iov->iov_len))
3527 return -EINVAL;
3528 frames = bytes_to_samples(runtime, iov->iov_len);
3529 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3530 if (bufs == NULL)
3531 return -ENOMEM;
3532 for (i = 0; i < to->nr_segs; ++i) {
3533 bufs[i] = iov->iov_base;
3534 iov++;
3535 }
3536 result = snd_pcm_lib_readv(substream, bufs, frames);
3537 if (result > 0)
3538 result = frames_to_bytes(runtime, result);
3539 return result;
3540}
3541
3542static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3543{
3544 struct snd_pcm_file *pcm_file;
3545 struct snd_pcm_substream *substream;
3546 struct snd_pcm_runtime *runtime;
3547 snd_pcm_sframes_t result;
3548 unsigned long i;
3549 void __user **bufs __free(kfree) = NULL;
3550 snd_pcm_uframes_t frames;
3551 const struct iovec *iov = iter_iov(from);
3552
3553 pcm_file = iocb->ki_filp->private_data;
3554 substream = pcm_file->substream;
3555 if (PCM_RUNTIME_CHECK(substream))
3556 return -ENXIO;
3557 runtime = substream->runtime;
3558 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3559 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3560 return -EBADFD;
3561 if (!user_backed_iter(from))
3562 return -EINVAL;
3563 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3564 !frame_aligned(runtime, iov->iov_len))
3565 return -EINVAL;
3566 frames = bytes_to_samples(runtime, iov->iov_len);
3567 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3568 if (bufs == NULL)
3569 return -ENOMEM;
3570 for (i = 0; i < from->nr_segs; ++i) {
3571 bufs[i] = iov->iov_base;
3572 iov++;
3573 }
3574 result = snd_pcm_lib_writev(substream, bufs, frames);
3575 if (result > 0)
3576 result = frames_to_bytes(runtime, result);
3577 return result;
3578}
3579
3580static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3581{
3582 struct snd_pcm_file *pcm_file;
3583 struct snd_pcm_substream *substream;
3584 struct snd_pcm_runtime *runtime;
3585 __poll_t mask, ok;
3586 snd_pcm_uframes_t avail;
3587
3588 pcm_file = file->private_data;
3589
3590 substream = pcm_file->substream;
3591 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3592 ok = EPOLLOUT | EPOLLWRNORM;
3593 else
3594 ok = EPOLLIN | EPOLLRDNORM;
3595 if (PCM_RUNTIME_CHECK(substream))
3596 return ok | EPOLLERR;
3597
3598 runtime = substream->runtime;
3599 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3600 return ok | EPOLLERR;
3601
3602 poll_wait(file, &runtime->sleep, wait);
3603
3604 mask = 0;
3605 guard(pcm_stream_lock_irq)(substream);
3606 avail = snd_pcm_avail(substream);
3607 switch (runtime->state) {
3608 case SNDRV_PCM_STATE_RUNNING:
3609 case SNDRV_PCM_STATE_PREPARED:
3610 case SNDRV_PCM_STATE_PAUSED:
3611 if (avail >= runtime->control->avail_min)
3612 mask = ok;
3613 break;
3614 case SNDRV_PCM_STATE_DRAINING:
3615 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3616 mask = ok;
3617 if (!avail)
3618 mask |= EPOLLERR;
3619 }
3620 break;
3621 default:
3622 mask = ok | EPOLLERR;
3623 break;
3624 }
3625 return mask;
3626}
3627
3628/*
3629 * mmap support
3630 */
3631
3632/*
3633 * Only on coherent architectures, we can mmap the status and the control records
3634 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3635 */
3636#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3637/*
3638 * mmap status record
3639 */
3640static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3641{
3642 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3643 struct snd_pcm_runtime *runtime;
3644
3645 if (substream == NULL)
3646 return VM_FAULT_SIGBUS;
3647 runtime = substream->runtime;
3648 vmf->page = virt_to_page(runtime->status);
3649 get_page(vmf->page);
3650 return 0;
3651}
3652
3653static const struct vm_operations_struct snd_pcm_vm_ops_status =
3654{
3655 .fault = snd_pcm_mmap_status_fault,
3656};
3657
3658static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3659 struct vm_area_struct *area)
3660{
3661 long size;
3662 if (!(area->vm_flags & VM_READ))
3663 return -EINVAL;
3664 size = area->vm_end - area->vm_start;
3665 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3666 return -EINVAL;
3667 area->vm_ops = &snd_pcm_vm_ops_status;
3668 area->vm_private_data = substream;
3669 vm_flags_mod(area, VM_DONTEXPAND | VM_DONTDUMP,
3670 VM_WRITE | VM_MAYWRITE);
3671
3672 return 0;
3673}
3674
3675/*
3676 * mmap control record
3677 */
3678static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3679{
3680 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3681 struct snd_pcm_runtime *runtime;
3682
3683 if (substream == NULL)
3684 return VM_FAULT_SIGBUS;
3685 runtime = substream->runtime;
3686 vmf->page = virt_to_page(runtime->control);
3687 get_page(vmf->page);
3688 return 0;
3689}
3690
3691static const struct vm_operations_struct snd_pcm_vm_ops_control =
3692{
3693 .fault = snd_pcm_mmap_control_fault,
3694};
3695
3696static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3697 struct vm_area_struct *area)
3698{
3699 long size;
3700 if (!(area->vm_flags & VM_READ))
3701 return -EINVAL;
3702 size = area->vm_end - area->vm_start;
3703 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3704 return -EINVAL;
3705 area->vm_ops = &snd_pcm_vm_ops_control;
3706 area->vm_private_data = substream;
3707 vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3708 return 0;
3709}
3710
3711static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3712{
3713 /* If drivers require the explicit sync (typically for non-coherent
3714 * pages), we have to disable the mmap of status and control data
3715 * to enforce the control via SYNC_PTR ioctl.
3716 */
3717 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3718 return false;
3719 /* See pcm_control_mmap_allowed() below.
3720 * Since older alsa-lib requires both status and control mmaps to be
3721 * coupled, we have to disable the status mmap for old alsa-lib, too.
3722 */
3723 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3724 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3725 return false;
3726 return true;
3727}
3728
3729static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3730{
3731 if (pcm_file->no_compat_mmap)
3732 return false;
3733 /* see above */
3734 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3735 return false;
3736 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3737 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3738 * thus it effectively assures the manual update of appl_ptr.
3739 */
3740 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3741 return false;
3742 return true;
3743}
3744
3745#else /* ! coherent mmap */
3746/*
3747 * don't support mmap for status and control records.
3748 */
3749#define pcm_status_mmap_allowed(pcm_file) false
3750#define pcm_control_mmap_allowed(pcm_file) false
3751
3752static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3753 struct vm_area_struct *area)
3754{
3755 return -ENXIO;
3756}
3757static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3758 struct vm_area_struct *area)
3759{
3760 return -ENXIO;
3761}
3762#endif /* coherent mmap */
3763
3764/*
3765 * fault callback for mmapping a RAM page
3766 */
3767static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3768{
3769 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3770 struct snd_pcm_runtime *runtime;
3771 unsigned long offset;
3772 struct page * page;
3773 size_t dma_bytes;
3774
3775 if (substream == NULL)
3776 return VM_FAULT_SIGBUS;
3777 runtime = substream->runtime;
3778 offset = vmf->pgoff << PAGE_SHIFT;
3779 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3780 if (offset > dma_bytes - PAGE_SIZE)
3781 return VM_FAULT_SIGBUS;
3782 if (substream->ops->page)
3783 page = substream->ops->page(substream, offset);
3784 else if (!snd_pcm_get_dma_buf(substream))
3785 page = virt_to_page(runtime->dma_area + offset);
3786 else
3787 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3788 if (!page)
3789 return VM_FAULT_SIGBUS;
3790 get_page(page);
3791 vmf->page = page;
3792 return 0;
3793}
3794
3795static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3796 .open = snd_pcm_mmap_data_open,
3797 .close = snd_pcm_mmap_data_close,
3798};
3799
3800static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3801 .open = snd_pcm_mmap_data_open,
3802 .close = snd_pcm_mmap_data_close,
3803 .fault = snd_pcm_mmap_data_fault,
3804};
3805
3806/*
3807 * mmap the DMA buffer on RAM
3808 */
3809
3810/**
3811 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3812 * @substream: PCM substream
3813 * @area: VMA
3814 *
3815 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3816 * this function is invoked implicitly.
3817 *
3818 * Return: zero if successful, or a negative error code
3819 */
3820int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3821 struct vm_area_struct *area)
3822{
3823 vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3824 if (!substream->ops->page &&
3825 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3826 return 0;
3827 /* mmap with fault handler */
3828 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3829 return 0;
3830}
3831EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3832
3833/*
3834 * mmap the DMA buffer on I/O memory area
3835 */
3836#if SNDRV_PCM_INFO_MMAP_IOMEM
3837/**
3838 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3839 * @substream: PCM substream
3840 * @area: VMA
3841 *
3842 * When your hardware uses the iomapped pages as the hardware buffer and
3843 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3844 * is supposed to work only on limited architectures.
3845 *
3846 * Return: zero if successful, or a negative error code
3847 */
3848int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3849 struct vm_area_struct *area)
3850{
3851 struct snd_pcm_runtime *runtime = substream->runtime;
3852
3853 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3854 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3855}
3856EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3857#endif /* SNDRV_PCM_INFO_MMAP */
3858
3859/*
3860 * mmap DMA buffer
3861 */
3862int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3863 struct vm_area_struct *area)
3864{
3865 struct snd_pcm_runtime *runtime;
3866 long size;
3867 unsigned long offset;
3868 size_t dma_bytes;
3869 int err;
3870
3871 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3872 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3873 return -EINVAL;
3874 } else {
3875 if (!(area->vm_flags & VM_READ))
3876 return -EINVAL;
3877 }
3878 runtime = substream->runtime;
3879 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3880 return -EBADFD;
3881 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3882 return -ENXIO;
3883 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3884 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3885 return -EINVAL;
3886 size = area->vm_end - area->vm_start;
3887 offset = area->vm_pgoff << PAGE_SHIFT;
3888 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3889 if ((size_t)size > dma_bytes)
3890 return -EINVAL;
3891 if (offset > dma_bytes - size)
3892 return -EINVAL;
3893
3894 area->vm_ops = &snd_pcm_vm_ops_data;
3895 area->vm_private_data = substream;
3896 if (substream->ops->mmap)
3897 err = substream->ops->mmap(substream, area);
3898 else
3899 err = snd_pcm_lib_default_mmap(substream, area);
3900 if (!err)
3901 atomic_inc(&substream->mmap_count);
3902 return err;
3903}
3904EXPORT_SYMBOL(snd_pcm_mmap_data);
3905
3906static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3907{
3908 struct snd_pcm_file * pcm_file;
3909 struct snd_pcm_substream *substream;
3910 unsigned long offset;
3911
3912 pcm_file = file->private_data;
3913 substream = pcm_file->substream;
3914 if (PCM_RUNTIME_CHECK(substream))
3915 return -ENXIO;
3916 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3917 return -EBADFD;
3918
3919 offset = area->vm_pgoff << PAGE_SHIFT;
3920 switch (offset) {
3921 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3922 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3923 return -ENXIO;
3924 fallthrough;
3925 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3926 if (!pcm_status_mmap_allowed(pcm_file))
3927 return -ENXIO;
3928 return snd_pcm_mmap_status(substream, file, area);
3929 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3930 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3931 return -ENXIO;
3932 fallthrough;
3933 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3934 if (!pcm_control_mmap_allowed(pcm_file))
3935 return -ENXIO;
3936 return snd_pcm_mmap_control(substream, file, area);
3937 default:
3938 return snd_pcm_mmap_data(substream, file, area);
3939 }
3940 return 0;
3941}
3942
3943static int snd_pcm_fasync(int fd, struct file * file, int on)
3944{
3945 struct snd_pcm_file * pcm_file;
3946 struct snd_pcm_substream *substream;
3947 struct snd_pcm_runtime *runtime;
3948
3949 pcm_file = file->private_data;
3950 substream = pcm_file->substream;
3951 if (PCM_RUNTIME_CHECK(substream))
3952 return -ENXIO;
3953 runtime = substream->runtime;
3954 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3955 return -EBADFD;
3956 return snd_fasync_helper(fd, file, on, &runtime->fasync);
3957}
3958
3959/*
3960 * ioctl32 compat
3961 */
3962#ifdef CONFIG_COMPAT
3963#include "pcm_compat.c"
3964#else
3965#define snd_pcm_ioctl_compat NULL
3966#endif
3967
3968/*
3969 * To be removed helpers to keep binary compatibility
3970 */
3971
3972#ifdef CONFIG_SND_SUPPORT_OLD_API
3973#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3974#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3975
3976static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3977 struct snd_pcm_hw_params_old *oparams)
3978{
3979 unsigned int i;
3980
3981 memset(params, 0, sizeof(*params));
3982 params->flags = oparams->flags;
3983 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3984 params->masks[i].bits[0] = oparams->masks[i];
3985 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3986 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3987 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3988 params->info = oparams->info;
3989 params->msbits = oparams->msbits;
3990 params->rate_num = oparams->rate_num;
3991 params->rate_den = oparams->rate_den;
3992 params->fifo_size = oparams->fifo_size;
3993}
3994
3995static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3996 struct snd_pcm_hw_params *params)
3997{
3998 unsigned int i;
3999
4000 memset(oparams, 0, sizeof(*oparams));
4001 oparams->flags = params->flags;
4002 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4003 oparams->masks[i] = params->masks[i].bits[0];
4004 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4005 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4006 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4007 oparams->info = params->info;
4008 oparams->msbits = params->msbits;
4009 oparams->rate_num = params->rate_num;
4010 oparams->rate_den = params->rate_den;
4011 oparams->fifo_size = params->fifo_size;
4012}
4013
4014static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4015 struct snd_pcm_hw_params_old __user * _oparams)
4016{
4017 struct snd_pcm_hw_params *params __free(kfree) = NULL;
4018 struct snd_pcm_hw_params_old *oparams __free(kfree) = NULL;
4019 int err;
4020
4021 params = kmalloc(sizeof(*params), GFP_KERNEL);
4022 if (!params)
4023 return -ENOMEM;
4024
4025 oparams = memdup_user(_oparams, sizeof(*oparams));
4026 if (IS_ERR(oparams))
4027 return PTR_ERR(no_free_ptr(oparams));
4028 snd_pcm_hw_convert_from_old_params(params, oparams);
4029 err = snd_pcm_hw_refine(substream, params);
4030 if (err < 0)
4031 return err;
4032
4033 err = fixup_unreferenced_params(substream, params);
4034 if (err < 0)
4035 return err;
4036
4037 snd_pcm_hw_convert_to_old_params(oparams, params);
4038 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4039 return -EFAULT;
4040 return 0;
4041}
4042
4043static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4044 struct snd_pcm_hw_params_old __user * _oparams)
4045{
4046 struct snd_pcm_hw_params *params __free(kfree) = NULL;
4047 struct snd_pcm_hw_params_old *oparams __free(kfree) = NULL;
4048 int err;
4049
4050 params = kmalloc(sizeof(*params), GFP_KERNEL);
4051 if (!params)
4052 return -ENOMEM;
4053
4054 oparams = memdup_user(_oparams, sizeof(*oparams));
4055 if (IS_ERR(oparams))
4056 return PTR_ERR(no_free_ptr(oparams));
4057
4058 snd_pcm_hw_convert_from_old_params(params, oparams);
4059 err = snd_pcm_hw_params(substream, params);
4060 if (err < 0)
4061 return err;
4062
4063 snd_pcm_hw_convert_to_old_params(oparams, params);
4064 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4065 return -EFAULT;
4066 return 0;
4067}
4068#endif /* CONFIG_SND_SUPPORT_OLD_API */
4069
4070#ifndef CONFIG_MMU
4071static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4072 unsigned long addr,
4073 unsigned long len,
4074 unsigned long pgoff,
4075 unsigned long flags)
4076{
4077 struct snd_pcm_file *pcm_file = file->private_data;
4078 struct snd_pcm_substream *substream = pcm_file->substream;
4079 struct snd_pcm_runtime *runtime = substream->runtime;
4080 unsigned long offset = pgoff << PAGE_SHIFT;
4081
4082 switch (offset) {
4083 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4084 return (unsigned long)runtime->status;
4085 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4086 return (unsigned long)runtime->control;
4087 default:
4088 return (unsigned long)runtime->dma_area + offset;
4089 }
4090}
4091#else
4092# define snd_pcm_get_unmapped_area NULL
4093#endif
4094
4095/*
4096 * Register section
4097 */
4098
4099const struct file_operations snd_pcm_f_ops[2] = {
4100 {
4101 .owner = THIS_MODULE,
4102 .write = snd_pcm_write,
4103 .write_iter = snd_pcm_writev,
4104 .open = snd_pcm_playback_open,
4105 .release = snd_pcm_release,
4106 .llseek = no_llseek,
4107 .poll = snd_pcm_poll,
4108 .unlocked_ioctl = snd_pcm_ioctl,
4109 .compat_ioctl = snd_pcm_ioctl_compat,
4110 .mmap = snd_pcm_mmap,
4111 .fasync = snd_pcm_fasync,
4112 .get_unmapped_area = snd_pcm_get_unmapped_area,
4113 },
4114 {
4115 .owner = THIS_MODULE,
4116 .read = snd_pcm_read,
4117 .read_iter = snd_pcm_readv,
4118 .open = snd_pcm_capture_open,
4119 .release = snd_pcm_release,
4120 .llseek = no_llseek,
4121 .poll = snd_pcm_poll,
4122 .unlocked_ioctl = snd_pcm_ioctl,
4123 .compat_ioctl = snd_pcm_ioctl_compat,
4124 .mmap = snd_pcm_mmap,
4125 .fasync = snd_pcm_fasync,
4126 .get_unmapped_area = snd_pcm_get_unmapped_area,
4127 }
4128};