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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/init.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27#include <linux/device.h>
28#include <sound/core.h>
29#include <sound/minors.h>
30#include <sound/pcm.h>
31#include <sound/control.h>
32#include <sound/info.h>
33
34MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
35MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
36MODULE_LICENSE("GPL");
37
38static LIST_HEAD(snd_pcm_devices);
39static LIST_HEAD(snd_pcm_notify_list);
40static DEFINE_MUTEX(register_mutex);
41
42static int snd_pcm_free(struct snd_pcm *pcm);
43static int snd_pcm_dev_free(struct snd_device *device);
44static int snd_pcm_dev_register(struct snd_device *device);
45static int snd_pcm_dev_disconnect(struct snd_device *device);
46
47static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
48{
49 struct snd_pcm *pcm;
50
51 list_for_each_entry(pcm, &snd_pcm_devices, list) {
52 if (pcm->card == card && pcm->device == device)
53 return pcm;
54 }
55 return NULL;
56}
57
58static int snd_pcm_next(struct snd_card *card, int device)
59{
60 struct snd_pcm *pcm;
61
62 list_for_each_entry(pcm, &snd_pcm_devices, list) {
63 if (pcm->card == card && pcm->device > device)
64 return pcm->device;
65 else if (pcm->card->number > card->number)
66 return -1;
67 }
68 return -1;
69}
70
71static int snd_pcm_add(struct snd_pcm *newpcm)
72{
73 struct snd_pcm *pcm;
74
75 if (newpcm->internal)
76 return 0;
77
78 list_for_each_entry(pcm, &snd_pcm_devices, list) {
79 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
80 return -EBUSY;
81 if (pcm->card->number > newpcm->card->number ||
82 (pcm->card == newpcm->card &&
83 pcm->device > newpcm->device)) {
84 list_add(&newpcm->list, pcm->list.prev);
85 return 0;
86 }
87 }
88 list_add_tail(&newpcm->list, &snd_pcm_devices);
89 return 0;
90}
91
92static int snd_pcm_control_ioctl(struct snd_card *card,
93 struct snd_ctl_file *control,
94 unsigned int cmd, unsigned long arg)
95{
96 switch (cmd) {
97 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
98 {
99 int device;
100
101 if (get_user(device, (int __user *)arg))
102 return -EFAULT;
103 mutex_lock(®ister_mutex);
104 device = snd_pcm_next(card, device);
105 mutex_unlock(®ister_mutex);
106 if (put_user(device, (int __user *)arg))
107 return -EFAULT;
108 return 0;
109 }
110 case SNDRV_CTL_IOCTL_PCM_INFO:
111 {
112 struct snd_pcm_info __user *info;
113 unsigned int device, subdevice;
114 int stream;
115 struct snd_pcm *pcm;
116 struct snd_pcm_str *pstr;
117 struct snd_pcm_substream *substream;
118 int err;
119
120 info = (struct snd_pcm_info __user *)arg;
121 if (get_user(device, &info->device))
122 return -EFAULT;
123 if (get_user(stream, &info->stream))
124 return -EFAULT;
125 if (stream < 0 || stream > 1)
126 return -EINVAL;
127 if (get_user(subdevice, &info->subdevice))
128 return -EFAULT;
129 mutex_lock(®ister_mutex);
130 pcm = snd_pcm_get(card, device);
131 if (pcm == NULL) {
132 err = -ENXIO;
133 goto _error;
134 }
135 pstr = &pcm->streams[stream];
136 if (pstr->substream_count == 0) {
137 err = -ENOENT;
138 goto _error;
139 }
140 if (subdevice >= pstr->substream_count) {
141 err = -ENXIO;
142 goto _error;
143 }
144 for (substream = pstr->substream; substream;
145 substream = substream->next)
146 if (substream->number == (int)subdevice)
147 break;
148 if (substream == NULL) {
149 err = -ENXIO;
150 goto _error;
151 }
152 err = snd_pcm_info_user(substream, info);
153 _error:
154 mutex_unlock(®ister_mutex);
155 return err;
156 }
157 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
158 {
159 int val;
160
161 if (get_user(val, (int __user *)arg))
162 return -EFAULT;
163 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
164 return 0;
165 }
166 }
167 return -ENOIOCTLCMD;
168}
169
170#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
171
172static char *snd_pcm_format_names[] = {
173 FORMAT(S8),
174 FORMAT(U8),
175 FORMAT(S16_LE),
176 FORMAT(S16_BE),
177 FORMAT(U16_LE),
178 FORMAT(U16_BE),
179 FORMAT(S24_LE),
180 FORMAT(S24_BE),
181 FORMAT(U24_LE),
182 FORMAT(U24_BE),
183 FORMAT(S32_LE),
184 FORMAT(S32_BE),
185 FORMAT(U32_LE),
186 FORMAT(U32_BE),
187 FORMAT(FLOAT_LE),
188 FORMAT(FLOAT_BE),
189 FORMAT(FLOAT64_LE),
190 FORMAT(FLOAT64_BE),
191 FORMAT(IEC958_SUBFRAME_LE),
192 FORMAT(IEC958_SUBFRAME_BE),
193 FORMAT(MU_LAW),
194 FORMAT(A_LAW),
195 FORMAT(IMA_ADPCM),
196 FORMAT(MPEG),
197 FORMAT(GSM),
198 FORMAT(SPECIAL),
199 FORMAT(S24_3LE),
200 FORMAT(S24_3BE),
201 FORMAT(U24_3LE),
202 FORMAT(U24_3BE),
203 FORMAT(S20_3LE),
204 FORMAT(S20_3BE),
205 FORMAT(U20_3LE),
206 FORMAT(U20_3BE),
207 FORMAT(S18_3LE),
208 FORMAT(S18_3BE),
209 FORMAT(U18_3LE),
210 FORMAT(U18_3BE),
211 FORMAT(G723_24),
212 FORMAT(G723_24_1B),
213 FORMAT(G723_40),
214 FORMAT(G723_40_1B),
215 FORMAT(DSD_U8),
216 FORMAT(DSD_U16_LE),
217 FORMAT(DSD_U32_LE),
218 FORMAT(DSD_U16_BE),
219 FORMAT(DSD_U32_BE),
220};
221
222/**
223 * snd_pcm_format_name - Return a name string for the given PCM format
224 * @format: PCM format
225 */
226const char *snd_pcm_format_name(snd_pcm_format_t format)
227{
228 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
229 return "Unknown";
230 return snd_pcm_format_names[(__force unsigned int)format];
231}
232EXPORT_SYMBOL_GPL(snd_pcm_format_name);
233
234#ifdef CONFIG_SND_VERBOSE_PROCFS
235
236#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
237#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
238#define READY(v) [SNDRV_PCM_READY_##v] = #v
239#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
240#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
241#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
242#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
243#define START(v) [SNDRV_PCM_START_##v] = #v
244#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
245
246static char *snd_pcm_stream_names[] = {
247 STREAM(PLAYBACK),
248 STREAM(CAPTURE),
249};
250
251static char *snd_pcm_state_names[] = {
252 STATE(OPEN),
253 STATE(SETUP),
254 STATE(PREPARED),
255 STATE(RUNNING),
256 STATE(XRUN),
257 STATE(DRAINING),
258 STATE(PAUSED),
259 STATE(SUSPENDED),
260};
261
262static char *snd_pcm_access_names[] = {
263 ACCESS(MMAP_INTERLEAVED),
264 ACCESS(MMAP_NONINTERLEAVED),
265 ACCESS(MMAP_COMPLEX),
266 ACCESS(RW_INTERLEAVED),
267 ACCESS(RW_NONINTERLEAVED),
268};
269
270static char *snd_pcm_subformat_names[] = {
271 SUBFORMAT(STD),
272};
273
274static char *snd_pcm_tstamp_mode_names[] = {
275 TSTAMP(NONE),
276 TSTAMP(ENABLE),
277};
278
279static const char *snd_pcm_stream_name(int stream)
280{
281 return snd_pcm_stream_names[stream];
282}
283
284static const char *snd_pcm_access_name(snd_pcm_access_t access)
285{
286 return snd_pcm_access_names[(__force int)access];
287}
288
289static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
290{
291 return snd_pcm_subformat_names[(__force int)subformat];
292}
293
294static const char *snd_pcm_tstamp_mode_name(int mode)
295{
296 return snd_pcm_tstamp_mode_names[mode];
297}
298
299static const char *snd_pcm_state_name(snd_pcm_state_t state)
300{
301 return snd_pcm_state_names[(__force int)state];
302}
303
304#if IS_ENABLED(CONFIG_SND_PCM_OSS)
305#include <linux/soundcard.h>
306
307static const char *snd_pcm_oss_format_name(int format)
308{
309 switch (format) {
310 case AFMT_MU_LAW:
311 return "MU_LAW";
312 case AFMT_A_LAW:
313 return "A_LAW";
314 case AFMT_IMA_ADPCM:
315 return "IMA_ADPCM";
316 case AFMT_U8:
317 return "U8";
318 case AFMT_S16_LE:
319 return "S16_LE";
320 case AFMT_S16_BE:
321 return "S16_BE";
322 case AFMT_S8:
323 return "S8";
324 case AFMT_U16_LE:
325 return "U16_LE";
326 case AFMT_U16_BE:
327 return "U16_BE";
328 case AFMT_MPEG:
329 return "MPEG";
330 default:
331 return "unknown";
332 }
333}
334#endif
335
336static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
337 struct snd_info_buffer *buffer)
338{
339 struct snd_pcm_info *info;
340 int err;
341
342 if (! substream)
343 return;
344
345 info = kmalloc(sizeof(*info), GFP_KERNEL);
346 if (!info)
347 return;
348
349 err = snd_pcm_info(substream, info);
350 if (err < 0) {
351 snd_iprintf(buffer, "error %d\n", err);
352 kfree(info);
353 return;
354 }
355 snd_iprintf(buffer, "card: %d\n", info->card);
356 snd_iprintf(buffer, "device: %d\n", info->device);
357 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
358 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
359 snd_iprintf(buffer, "id: %s\n", info->id);
360 snd_iprintf(buffer, "name: %s\n", info->name);
361 snd_iprintf(buffer, "subname: %s\n", info->subname);
362 snd_iprintf(buffer, "class: %d\n", info->dev_class);
363 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
364 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
365 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
366 kfree(info);
367}
368
369static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
370 struct snd_info_buffer *buffer)
371{
372 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
373 buffer);
374}
375
376static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
378{
379 snd_pcm_proc_info_read(entry->private_data, buffer);
380}
381
382static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
383 struct snd_info_buffer *buffer)
384{
385 struct snd_pcm_substream *substream = entry->private_data;
386 struct snd_pcm_runtime *runtime;
387
388 mutex_lock(&substream->pcm->open_mutex);
389 runtime = substream->runtime;
390 if (!runtime) {
391 snd_iprintf(buffer, "closed\n");
392 goto unlock;
393 }
394 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
395 snd_iprintf(buffer, "no setup\n");
396 goto unlock;
397 }
398 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
399 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
400 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
401 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
402 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
403 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
404 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
405#if IS_ENABLED(CONFIG_SND_PCM_OSS)
406 if (substream->oss.oss) {
407 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
408 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
409 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
410 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
411 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
412 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
413 }
414#endif
415 unlock:
416 mutex_unlock(&substream->pcm->open_mutex);
417}
418
419static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
420 struct snd_info_buffer *buffer)
421{
422 struct snd_pcm_substream *substream = entry->private_data;
423 struct snd_pcm_runtime *runtime;
424
425 mutex_lock(&substream->pcm->open_mutex);
426 runtime = substream->runtime;
427 if (!runtime) {
428 snd_iprintf(buffer, "closed\n");
429 goto unlock;
430 }
431 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
432 snd_iprintf(buffer, "no setup\n");
433 goto unlock;
434 }
435 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
436 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
437 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
438 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
439 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
440 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
441 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
442 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
443 unlock:
444 mutex_unlock(&substream->pcm->open_mutex);
445}
446
447static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
448 struct snd_info_buffer *buffer)
449{
450 struct snd_pcm_substream *substream = entry->private_data;
451 struct snd_pcm_runtime *runtime;
452 struct snd_pcm_status status;
453 int err;
454
455 mutex_lock(&substream->pcm->open_mutex);
456 runtime = substream->runtime;
457 if (!runtime) {
458 snd_iprintf(buffer, "closed\n");
459 goto unlock;
460 }
461 memset(&status, 0, sizeof(status));
462 err = snd_pcm_status(substream, &status);
463 if (err < 0) {
464 snd_iprintf(buffer, "error %d\n", err);
465 goto unlock;
466 }
467 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
468 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
469 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
470 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
471 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
472 status.tstamp.tv_sec, status.tstamp.tv_nsec);
473 snd_iprintf(buffer, "delay : %ld\n", status.delay);
474 snd_iprintf(buffer, "avail : %ld\n", status.avail);
475 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
476 snd_iprintf(buffer, "-----\n");
477 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
478 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
479 unlock:
480 mutex_unlock(&substream->pcm->open_mutex);
481}
482
483#ifdef CONFIG_SND_PCM_XRUN_DEBUG
484static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
485 struct snd_info_buffer *buffer)
486{
487 struct snd_pcm_substream *substream = entry->private_data;
488 struct snd_pcm_runtime *runtime;
489
490 snd_pcm_stream_lock_irq(substream);
491 runtime = substream->runtime;
492 if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
493 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
494 snd_pcm_stream_unlock_irq(substream);
495}
496
497static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
498 struct snd_info_buffer *buffer)
499{
500 struct snd_pcm_str *pstr = entry->private_data;
501 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
502}
503
504static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
505 struct snd_info_buffer *buffer)
506{
507 struct snd_pcm_str *pstr = entry->private_data;
508 char line[64];
509 if (!snd_info_get_line(buffer, line, sizeof(line)))
510 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
511}
512#endif
513
514static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
515{
516 struct snd_pcm *pcm = pstr->pcm;
517 struct snd_info_entry *entry;
518 char name[16];
519
520 sprintf(name, "pcm%i%c", pcm->device,
521 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
522 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
523 return -ENOMEM;
524 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
525 if (snd_info_register(entry) < 0) {
526 snd_info_free_entry(entry);
527 return -ENOMEM;
528 }
529 pstr->proc_root = entry;
530
531 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
532 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
533 if (snd_info_register(entry) < 0) {
534 snd_info_free_entry(entry);
535 entry = NULL;
536 }
537 }
538 pstr->proc_info_entry = entry;
539
540#ifdef CONFIG_SND_PCM_XRUN_DEBUG
541 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
542 pstr->proc_root)) != NULL) {
543 entry->c.text.read = snd_pcm_xrun_debug_read;
544 entry->c.text.write = snd_pcm_xrun_debug_write;
545 entry->mode |= S_IWUSR;
546 entry->private_data = pstr;
547 if (snd_info_register(entry) < 0) {
548 snd_info_free_entry(entry);
549 entry = NULL;
550 }
551 }
552 pstr->proc_xrun_debug_entry = entry;
553#endif
554 return 0;
555}
556
557static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
558{
559#ifdef CONFIG_SND_PCM_XRUN_DEBUG
560 snd_info_free_entry(pstr->proc_xrun_debug_entry);
561 pstr->proc_xrun_debug_entry = NULL;
562#endif
563 snd_info_free_entry(pstr->proc_info_entry);
564 pstr->proc_info_entry = NULL;
565 snd_info_free_entry(pstr->proc_root);
566 pstr->proc_root = NULL;
567 return 0;
568}
569
570static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
571{
572 struct snd_info_entry *entry;
573 struct snd_card *card;
574 char name[16];
575
576 card = substream->pcm->card;
577
578 sprintf(name, "sub%i", substream->number);
579 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
580 return -ENOMEM;
581 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
582 if (snd_info_register(entry) < 0) {
583 snd_info_free_entry(entry);
584 return -ENOMEM;
585 }
586 substream->proc_root = entry;
587
588 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
589 snd_info_set_text_ops(entry, substream,
590 snd_pcm_substream_proc_info_read);
591 if (snd_info_register(entry) < 0) {
592 snd_info_free_entry(entry);
593 entry = NULL;
594 }
595 }
596 substream->proc_info_entry = entry;
597
598 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
599 snd_info_set_text_ops(entry, substream,
600 snd_pcm_substream_proc_hw_params_read);
601 if (snd_info_register(entry) < 0) {
602 snd_info_free_entry(entry);
603 entry = NULL;
604 }
605 }
606 substream->proc_hw_params_entry = entry;
607
608 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
609 snd_info_set_text_ops(entry, substream,
610 snd_pcm_substream_proc_sw_params_read);
611 if (snd_info_register(entry) < 0) {
612 snd_info_free_entry(entry);
613 entry = NULL;
614 }
615 }
616 substream->proc_sw_params_entry = entry;
617
618 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
619 snd_info_set_text_ops(entry, substream,
620 snd_pcm_substream_proc_status_read);
621 if (snd_info_register(entry) < 0) {
622 snd_info_free_entry(entry);
623 entry = NULL;
624 }
625 }
626 substream->proc_status_entry = entry;
627
628#ifdef CONFIG_SND_PCM_XRUN_DEBUG
629 entry = snd_info_create_card_entry(card, "xrun_injection",
630 substream->proc_root);
631 if (entry) {
632 entry->private_data = substream;
633 entry->c.text.read = NULL;
634 entry->c.text.write = snd_pcm_xrun_injection_write;
635 entry->mode = S_IFREG | S_IWUSR;
636 if (snd_info_register(entry) < 0) {
637 snd_info_free_entry(entry);
638 entry = NULL;
639 }
640 }
641 substream->proc_xrun_injection_entry = entry;
642#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
643
644 return 0;
645}
646
647static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
648{
649 snd_info_free_entry(substream->proc_info_entry);
650 substream->proc_info_entry = NULL;
651 snd_info_free_entry(substream->proc_hw_params_entry);
652 substream->proc_hw_params_entry = NULL;
653 snd_info_free_entry(substream->proc_sw_params_entry);
654 substream->proc_sw_params_entry = NULL;
655 snd_info_free_entry(substream->proc_status_entry);
656 substream->proc_status_entry = NULL;
657#ifdef CONFIG_SND_PCM_XRUN_DEBUG
658 snd_info_free_entry(substream->proc_xrun_injection_entry);
659 substream->proc_xrun_injection_entry = NULL;
660#endif
661 snd_info_free_entry(substream->proc_root);
662 substream->proc_root = NULL;
663 return 0;
664}
665#else /* !CONFIG_SND_VERBOSE_PROCFS */
666static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
667static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
668static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
669static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
670#endif /* CONFIG_SND_VERBOSE_PROCFS */
671
672static const struct attribute_group *pcm_dev_attr_groups[];
673
674/**
675 * snd_pcm_new_stream - create a new PCM stream
676 * @pcm: the pcm instance
677 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
678 * @substream_count: the number of substreams
679 *
680 * Creates a new stream for the pcm.
681 * The corresponding stream on the pcm must have been empty before
682 * calling this, i.e. zero must be given to the argument of
683 * snd_pcm_new().
684 *
685 * Return: Zero if successful, or a negative error code on failure.
686 */
687int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
688{
689 int idx, err;
690 struct snd_pcm_str *pstr = &pcm->streams[stream];
691 struct snd_pcm_substream *substream, *prev;
692
693#if IS_ENABLED(CONFIG_SND_PCM_OSS)
694 mutex_init(&pstr->oss.setup_mutex);
695#endif
696 pstr->stream = stream;
697 pstr->pcm = pcm;
698 pstr->substream_count = substream_count;
699 if (!substream_count)
700 return 0;
701
702 snd_device_initialize(&pstr->dev, pcm->card);
703 pstr->dev.groups = pcm_dev_attr_groups;
704 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
705 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
706
707 if (!pcm->internal) {
708 err = snd_pcm_stream_proc_init(pstr);
709 if (err < 0) {
710 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
711 return err;
712 }
713 }
714 prev = NULL;
715 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
716 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
717 if (!substream)
718 return -ENOMEM;
719 substream->pcm = pcm;
720 substream->pstr = pstr;
721 substream->number = idx;
722 substream->stream = stream;
723 sprintf(substream->name, "subdevice #%i", idx);
724 substream->buffer_bytes_max = UINT_MAX;
725 if (prev == NULL)
726 pstr->substream = substream;
727 else
728 prev->next = substream;
729
730 if (!pcm->internal) {
731 err = snd_pcm_substream_proc_init(substream);
732 if (err < 0) {
733 pcm_err(pcm,
734 "Error in snd_pcm_stream_proc_init\n");
735 if (prev == NULL)
736 pstr->substream = NULL;
737 else
738 prev->next = NULL;
739 kfree(substream);
740 return err;
741 }
742 }
743 substream->group = &substream->self_group;
744 spin_lock_init(&substream->self_group.lock);
745 mutex_init(&substream->self_group.mutex);
746 INIT_LIST_HEAD(&substream->self_group.substreams);
747 list_add_tail(&substream->link_list, &substream->self_group.substreams);
748 atomic_set(&substream->mmap_count, 0);
749 prev = substream;
750 }
751 return 0;
752}
753EXPORT_SYMBOL(snd_pcm_new_stream);
754
755static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
756 int playback_count, int capture_count, bool internal,
757 struct snd_pcm **rpcm)
758{
759 struct snd_pcm *pcm;
760 int err;
761 static struct snd_device_ops ops = {
762 .dev_free = snd_pcm_dev_free,
763 .dev_register = snd_pcm_dev_register,
764 .dev_disconnect = snd_pcm_dev_disconnect,
765 };
766
767 if (snd_BUG_ON(!card))
768 return -ENXIO;
769 if (rpcm)
770 *rpcm = NULL;
771 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
772 if (!pcm)
773 return -ENOMEM;
774 pcm->card = card;
775 pcm->device = device;
776 pcm->internal = internal;
777 mutex_init(&pcm->open_mutex);
778 init_waitqueue_head(&pcm->open_wait);
779 INIT_LIST_HEAD(&pcm->list);
780 if (id)
781 strlcpy(pcm->id, id, sizeof(pcm->id));
782 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
783 snd_pcm_free(pcm);
784 return err;
785 }
786 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
787 snd_pcm_free(pcm);
788 return err;
789 }
790 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
791 snd_pcm_free(pcm);
792 return err;
793 }
794 if (rpcm)
795 *rpcm = pcm;
796 return 0;
797}
798
799/**
800 * snd_pcm_new - create a new PCM instance
801 * @card: the card instance
802 * @id: the id string
803 * @device: the device index (zero based)
804 * @playback_count: the number of substreams for playback
805 * @capture_count: the number of substreams for capture
806 * @rpcm: the pointer to store the new pcm instance
807 *
808 * Creates a new PCM instance.
809 *
810 * The pcm operators have to be set afterwards to the new instance
811 * via snd_pcm_set_ops().
812 *
813 * Return: Zero if successful, or a negative error code on failure.
814 */
815int snd_pcm_new(struct snd_card *card, const char *id, int device,
816 int playback_count, int capture_count, struct snd_pcm **rpcm)
817{
818 return _snd_pcm_new(card, id, device, playback_count, capture_count,
819 false, rpcm);
820}
821EXPORT_SYMBOL(snd_pcm_new);
822
823/**
824 * snd_pcm_new_internal - create a new internal PCM instance
825 * @card: the card instance
826 * @id: the id string
827 * @device: the device index (zero based - shared with normal PCMs)
828 * @playback_count: the number of substreams for playback
829 * @capture_count: the number of substreams for capture
830 * @rpcm: the pointer to store the new pcm instance
831 *
832 * Creates a new internal PCM instance with no userspace device or procfs
833 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
834 * will only be used internally by kernel drivers. i.e. it cannot be opened
835 * by userspace. It provides existing ASoC components drivers with a substream
836 * and access to any private data.
837 *
838 * The pcm operators have to be set afterwards to the new instance
839 * via snd_pcm_set_ops().
840 *
841 * Return: Zero if successful, or a negative error code on failure.
842 */
843int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
844 int playback_count, int capture_count,
845 struct snd_pcm **rpcm)
846{
847 return _snd_pcm_new(card, id, device, playback_count, capture_count,
848 true, rpcm);
849}
850EXPORT_SYMBOL(snd_pcm_new_internal);
851
852static void free_chmap(struct snd_pcm_str *pstr)
853{
854 if (pstr->chmap_kctl) {
855 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
856 pstr->chmap_kctl = NULL;
857 }
858}
859
860static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
861{
862 struct snd_pcm_substream *substream, *substream_next;
863#if IS_ENABLED(CONFIG_SND_PCM_OSS)
864 struct snd_pcm_oss_setup *setup, *setupn;
865#endif
866 substream = pstr->substream;
867 while (substream) {
868 substream_next = substream->next;
869 snd_pcm_timer_done(substream);
870 snd_pcm_substream_proc_done(substream);
871 kfree(substream);
872 substream = substream_next;
873 }
874 snd_pcm_stream_proc_done(pstr);
875#if IS_ENABLED(CONFIG_SND_PCM_OSS)
876 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
877 setupn = setup->next;
878 kfree(setup->task_name);
879 kfree(setup);
880 }
881#endif
882 free_chmap(pstr);
883 if (pstr->substream_count)
884 put_device(&pstr->dev);
885}
886
887static int snd_pcm_free(struct snd_pcm *pcm)
888{
889 struct snd_pcm_notify *notify;
890
891 if (!pcm)
892 return 0;
893 if (!pcm->internal) {
894 list_for_each_entry(notify, &snd_pcm_notify_list, list)
895 notify->n_unregister(pcm);
896 }
897 if (pcm->private_free)
898 pcm->private_free(pcm);
899 snd_pcm_lib_preallocate_free_for_all(pcm);
900 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
901 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
902 kfree(pcm);
903 return 0;
904}
905
906static int snd_pcm_dev_free(struct snd_device *device)
907{
908 struct snd_pcm *pcm = device->device_data;
909 return snd_pcm_free(pcm);
910}
911
912int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
913 struct file *file,
914 struct snd_pcm_substream **rsubstream)
915{
916 struct snd_pcm_str * pstr;
917 struct snd_pcm_substream *substream;
918 struct snd_pcm_runtime *runtime;
919 struct snd_card *card;
920 int prefer_subdevice;
921 size_t size;
922
923 if (snd_BUG_ON(!pcm || !rsubstream))
924 return -ENXIO;
925 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
926 stream != SNDRV_PCM_STREAM_CAPTURE))
927 return -EINVAL;
928 *rsubstream = NULL;
929 pstr = &pcm->streams[stream];
930 if (pstr->substream == NULL || pstr->substream_count == 0)
931 return -ENODEV;
932
933 card = pcm->card;
934 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
935
936 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
937 int opposite = !stream;
938
939 for (substream = pcm->streams[opposite].substream; substream;
940 substream = substream->next) {
941 if (SUBSTREAM_BUSY(substream))
942 return -EAGAIN;
943 }
944 }
945
946 if (file->f_flags & O_APPEND) {
947 if (prefer_subdevice < 0) {
948 if (pstr->substream_count > 1)
949 return -EINVAL; /* must be unique */
950 substream = pstr->substream;
951 } else {
952 for (substream = pstr->substream; substream;
953 substream = substream->next)
954 if (substream->number == prefer_subdevice)
955 break;
956 }
957 if (! substream)
958 return -ENODEV;
959 if (! SUBSTREAM_BUSY(substream))
960 return -EBADFD;
961 substream->ref_count++;
962 *rsubstream = substream;
963 return 0;
964 }
965
966 for (substream = pstr->substream; substream; substream = substream->next) {
967 if (!SUBSTREAM_BUSY(substream) &&
968 (prefer_subdevice == -1 ||
969 substream->number == prefer_subdevice))
970 break;
971 }
972 if (substream == NULL)
973 return -EAGAIN;
974
975 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
976 if (runtime == NULL)
977 return -ENOMEM;
978
979 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
980 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
981 if (runtime->status == NULL) {
982 kfree(runtime);
983 return -ENOMEM;
984 }
985 memset((void*)runtime->status, 0, size);
986
987 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
988 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
989 if (runtime->control == NULL) {
990 snd_free_pages((void*)runtime->status,
991 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
992 kfree(runtime);
993 return -ENOMEM;
994 }
995 memset((void*)runtime->control, 0, size);
996
997 init_waitqueue_head(&runtime->sleep);
998 init_waitqueue_head(&runtime->tsleep);
999
1000 runtime->status->state = SNDRV_PCM_STATE_OPEN;
1001
1002 substream->runtime = runtime;
1003 substream->private_data = pcm->private_data;
1004 substream->ref_count = 1;
1005 substream->f_flags = file->f_flags;
1006 substream->pid = get_pid(task_pid(current));
1007 pstr->substream_opened++;
1008 *rsubstream = substream;
1009 return 0;
1010}
1011
1012void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1013{
1014 struct snd_pcm_runtime *runtime;
1015
1016 if (PCM_RUNTIME_CHECK(substream))
1017 return;
1018 runtime = substream->runtime;
1019 if (runtime->private_free != NULL)
1020 runtime->private_free(runtime);
1021 snd_free_pages((void*)runtime->status,
1022 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1023 snd_free_pages((void*)runtime->control,
1024 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1025 kfree(runtime->hw_constraints.rules);
1026 kfree(runtime);
1027 substream->runtime = NULL;
1028 put_pid(substream->pid);
1029 substream->pid = NULL;
1030 substream->pstr->substream_opened--;
1031}
1032
1033static ssize_t show_pcm_class(struct device *dev,
1034 struct device_attribute *attr, char *buf)
1035{
1036 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1037 struct snd_pcm *pcm = pstr->pcm;
1038 const char *str;
1039 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1040 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1041 [SNDRV_PCM_CLASS_MULTI] = "multi",
1042 [SNDRV_PCM_CLASS_MODEM] = "modem",
1043 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1044 };
1045
1046 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1047 str = "none";
1048 else
1049 str = strs[pcm->dev_class];
1050 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1051}
1052
1053static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1054static struct attribute *pcm_dev_attrs[] = {
1055 &dev_attr_pcm_class.attr,
1056 NULL
1057};
1058
1059static struct attribute_group pcm_dev_attr_group = {
1060 .attrs = pcm_dev_attrs,
1061};
1062
1063static const struct attribute_group *pcm_dev_attr_groups[] = {
1064 &pcm_dev_attr_group,
1065 NULL
1066};
1067
1068static int snd_pcm_dev_register(struct snd_device *device)
1069{
1070 int cidx, err;
1071 struct snd_pcm_substream *substream;
1072 struct snd_pcm_notify *notify;
1073 struct snd_pcm *pcm;
1074
1075 if (snd_BUG_ON(!device || !device->device_data))
1076 return -ENXIO;
1077 pcm = device->device_data;
1078 if (pcm->internal)
1079 return 0;
1080
1081 mutex_lock(®ister_mutex);
1082 err = snd_pcm_add(pcm);
1083 if (err)
1084 goto unlock;
1085 for (cidx = 0; cidx < 2; cidx++) {
1086 int devtype = -1;
1087 if (pcm->streams[cidx].substream == NULL)
1088 continue;
1089 switch (cidx) {
1090 case SNDRV_PCM_STREAM_PLAYBACK:
1091 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1092 break;
1093 case SNDRV_PCM_STREAM_CAPTURE:
1094 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1095 break;
1096 }
1097 /* register pcm */
1098 err = snd_register_device(devtype, pcm->card, pcm->device,
1099 &snd_pcm_f_ops[cidx], pcm,
1100 &pcm->streams[cidx].dev);
1101 if (err < 0) {
1102 list_del_init(&pcm->list);
1103 goto unlock;
1104 }
1105
1106 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1107 snd_pcm_timer_init(substream);
1108 }
1109
1110 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1111 notify->n_register(pcm);
1112
1113 unlock:
1114 mutex_unlock(®ister_mutex);
1115 return err;
1116}
1117
1118static int snd_pcm_dev_disconnect(struct snd_device *device)
1119{
1120 struct snd_pcm *pcm = device->device_data;
1121 struct snd_pcm_notify *notify;
1122 struct snd_pcm_substream *substream;
1123 int cidx;
1124
1125 mutex_lock(®ister_mutex);
1126 mutex_lock(&pcm->open_mutex);
1127 wake_up(&pcm->open_wait);
1128 list_del_init(&pcm->list);
1129 for (cidx = 0; cidx < 2; cidx++) {
1130 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1131 snd_pcm_stream_lock_irq(substream);
1132 if (substream->runtime) {
1133 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1134 wake_up(&substream->runtime->sleep);
1135 wake_up(&substream->runtime->tsleep);
1136 }
1137 snd_pcm_stream_unlock_irq(substream);
1138 }
1139 }
1140 if (!pcm->internal) {
1141 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1142 notify->n_disconnect(pcm);
1143 }
1144 for (cidx = 0; cidx < 2; cidx++) {
1145 if (!pcm->internal)
1146 snd_unregister_device(&pcm->streams[cidx].dev);
1147 free_chmap(&pcm->streams[cidx]);
1148 }
1149 mutex_unlock(&pcm->open_mutex);
1150 mutex_unlock(®ister_mutex);
1151 return 0;
1152}
1153
1154/**
1155 * snd_pcm_notify - Add/remove the notify list
1156 * @notify: PCM notify list
1157 * @nfree: 0 = register, 1 = unregister
1158 *
1159 * This adds the given notifier to the global list so that the callback is
1160 * called for each registered PCM devices. This exists only for PCM OSS
1161 * emulation, so far.
1162 */
1163int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1164{
1165 struct snd_pcm *pcm;
1166
1167 if (snd_BUG_ON(!notify ||
1168 !notify->n_register ||
1169 !notify->n_unregister ||
1170 !notify->n_disconnect))
1171 return -EINVAL;
1172 mutex_lock(®ister_mutex);
1173 if (nfree) {
1174 list_del(¬ify->list);
1175 list_for_each_entry(pcm, &snd_pcm_devices, list)
1176 notify->n_unregister(pcm);
1177 } else {
1178 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1179 list_for_each_entry(pcm, &snd_pcm_devices, list)
1180 notify->n_register(pcm);
1181 }
1182 mutex_unlock(®ister_mutex);
1183 return 0;
1184}
1185EXPORT_SYMBOL(snd_pcm_notify);
1186
1187#ifdef CONFIG_SND_PROC_FS
1188/*
1189 * Info interface
1190 */
1191
1192static void snd_pcm_proc_read(struct snd_info_entry *entry,
1193 struct snd_info_buffer *buffer)
1194{
1195 struct snd_pcm *pcm;
1196
1197 mutex_lock(®ister_mutex);
1198 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1199 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1200 pcm->card->number, pcm->device, pcm->id, pcm->name);
1201 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1202 snd_iprintf(buffer, " : playback %i",
1203 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1204 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1205 snd_iprintf(buffer, " : capture %i",
1206 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1207 snd_iprintf(buffer, "\n");
1208 }
1209 mutex_unlock(®ister_mutex);
1210}
1211
1212static struct snd_info_entry *snd_pcm_proc_entry;
1213
1214static void snd_pcm_proc_init(void)
1215{
1216 struct snd_info_entry *entry;
1217
1218 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1219 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1220 if (snd_info_register(entry) < 0) {
1221 snd_info_free_entry(entry);
1222 entry = NULL;
1223 }
1224 }
1225 snd_pcm_proc_entry = entry;
1226}
1227
1228static void snd_pcm_proc_done(void)
1229{
1230 snd_info_free_entry(snd_pcm_proc_entry);
1231}
1232
1233#else /* !CONFIG_SND_PROC_FS */
1234#define snd_pcm_proc_init()
1235#define snd_pcm_proc_done()
1236#endif /* CONFIG_SND_PROC_FS */
1237
1238
1239/*
1240 * ENTRY functions
1241 */
1242
1243static int __init alsa_pcm_init(void)
1244{
1245 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1246 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1247 snd_pcm_proc_init();
1248 return 0;
1249}
1250
1251static void __exit alsa_pcm_exit(void)
1252{
1253 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1254 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1255 snd_pcm_proc_done();
1256}
1257
1258module_init(alsa_pcm_init)
1259module_exit(alsa_pcm_exit)
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/init.h>
8#include <linux/slab.h>
9#include <linux/module.h>
10#include <linux/time.h>
11#include <linux/mutex.h>
12#include <linux/device.h>
13#include <linux/nospec.h>
14#include <sound/core.h>
15#include <sound/minors.h>
16#include <sound/pcm.h>
17#include <sound/timer.h>
18#include <sound/control.h>
19#include <sound/info.h>
20
21#include "pcm_local.h"
22
23MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
24MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
25MODULE_LICENSE("GPL");
26
27static LIST_HEAD(snd_pcm_devices);
28static DEFINE_MUTEX(register_mutex);
29#if IS_ENABLED(CONFIG_SND_PCM_OSS)
30static LIST_HEAD(snd_pcm_notify_list);
31#endif
32
33static int snd_pcm_free(struct snd_pcm *pcm);
34static int snd_pcm_dev_free(struct snd_device *device);
35static int snd_pcm_dev_register(struct snd_device *device);
36static int snd_pcm_dev_disconnect(struct snd_device *device);
37
38static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
39{
40 struct snd_pcm *pcm;
41
42 list_for_each_entry(pcm, &snd_pcm_devices, list) {
43 if (pcm->card == card && pcm->device == device)
44 return pcm;
45 }
46 return NULL;
47}
48
49static int snd_pcm_next(struct snd_card *card, int device)
50{
51 struct snd_pcm *pcm;
52
53 list_for_each_entry(pcm, &snd_pcm_devices, list) {
54 if (pcm->card == card && pcm->device > device)
55 return pcm->device;
56 else if (pcm->card->number > card->number)
57 return -1;
58 }
59 return -1;
60}
61
62static int snd_pcm_add(struct snd_pcm *newpcm)
63{
64 struct snd_pcm *pcm;
65
66 if (newpcm->internal)
67 return 0;
68
69 list_for_each_entry(pcm, &snd_pcm_devices, list) {
70 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
71 return -EBUSY;
72 if (pcm->card->number > newpcm->card->number ||
73 (pcm->card == newpcm->card &&
74 pcm->device > newpcm->device)) {
75 list_add(&newpcm->list, pcm->list.prev);
76 return 0;
77 }
78 }
79 list_add_tail(&newpcm->list, &snd_pcm_devices);
80 return 0;
81}
82
83static int snd_pcm_control_ioctl(struct snd_card *card,
84 struct snd_ctl_file *control,
85 unsigned int cmd, unsigned long arg)
86{
87 switch (cmd) {
88 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
89 {
90 int device;
91
92 if (get_user(device, (int __user *)arg))
93 return -EFAULT;
94 mutex_lock(®ister_mutex);
95 device = snd_pcm_next(card, device);
96 mutex_unlock(®ister_mutex);
97 if (put_user(device, (int __user *)arg))
98 return -EFAULT;
99 return 0;
100 }
101 case SNDRV_CTL_IOCTL_PCM_INFO:
102 {
103 struct snd_pcm_info __user *info;
104 unsigned int device, subdevice;
105 int stream;
106 struct snd_pcm *pcm;
107 struct snd_pcm_str *pstr;
108 struct snd_pcm_substream *substream;
109 int err;
110
111 info = (struct snd_pcm_info __user *)arg;
112 if (get_user(device, &info->device))
113 return -EFAULT;
114 if (get_user(stream, &info->stream))
115 return -EFAULT;
116 if (stream < 0 || stream > 1)
117 return -EINVAL;
118 stream = array_index_nospec(stream, 2);
119 if (get_user(subdevice, &info->subdevice))
120 return -EFAULT;
121 mutex_lock(®ister_mutex);
122 pcm = snd_pcm_get(card, device);
123 if (pcm == NULL) {
124 err = -ENXIO;
125 goto _error;
126 }
127 pstr = &pcm->streams[stream];
128 if (pstr->substream_count == 0) {
129 err = -ENOENT;
130 goto _error;
131 }
132 if (subdevice >= pstr->substream_count) {
133 err = -ENXIO;
134 goto _error;
135 }
136 for (substream = pstr->substream; substream;
137 substream = substream->next)
138 if (substream->number == (int)subdevice)
139 break;
140 if (substream == NULL) {
141 err = -ENXIO;
142 goto _error;
143 }
144 mutex_lock(&pcm->open_mutex);
145 err = snd_pcm_info_user(substream, info);
146 mutex_unlock(&pcm->open_mutex);
147 _error:
148 mutex_unlock(®ister_mutex);
149 return err;
150 }
151 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
152 {
153 int val;
154
155 if (get_user(val, (int __user *)arg))
156 return -EFAULT;
157 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
158 return 0;
159 }
160 }
161 return -ENOIOCTLCMD;
162}
163
164#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
165
166static const char * const snd_pcm_format_names[] = {
167 FORMAT(S8),
168 FORMAT(U8),
169 FORMAT(S16_LE),
170 FORMAT(S16_BE),
171 FORMAT(U16_LE),
172 FORMAT(U16_BE),
173 FORMAT(S24_LE),
174 FORMAT(S24_BE),
175 FORMAT(U24_LE),
176 FORMAT(U24_BE),
177 FORMAT(S32_LE),
178 FORMAT(S32_BE),
179 FORMAT(U32_LE),
180 FORMAT(U32_BE),
181 FORMAT(FLOAT_LE),
182 FORMAT(FLOAT_BE),
183 FORMAT(FLOAT64_LE),
184 FORMAT(FLOAT64_BE),
185 FORMAT(IEC958_SUBFRAME_LE),
186 FORMAT(IEC958_SUBFRAME_BE),
187 FORMAT(MU_LAW),
188 FORMAT(A_LAW),
189 FORMAT(IMA_ADPCM),
190 FORMAT(MPEG),
191 FORMAT(GSM),
192 FORMAT(SPECIAL),
193 FORMAT(S24_3LE),
194 FORMAT(S24_3BE),
195 FORMAT(U24_3LE),
196 FORMAT(U24_3BE),
197 FORMAT(S20_3LE),
198 FORMAT(S20_3BE),
199 FORMAT(U20_3LE),
200 FORMAT(U20_3BE),
201 FORMAT(S18_3LE),
202 FORMAT(S18_3BE),
203 FORMAT(U18_3LE),
204 FORMAT(U18_3BE),
205 FORMAT(G723_24),
206 FORMAT(G723_24_1B),
207 FORMAT(G723_40),
208 FORMAT(G723_40_1B),
209 FORMAT(DSD_U8),
210 FORMAT(DSD_U16_LE),
211 FORMAT(DSD_U32_LE),
212 FORMAT(DSD_U16_BE),
213 FORMAT(DSD_U32_BE),
214};
215
216/**
217 * snd_pcm_format_name - Return a name string for the given PCM format
218 * @format: PCM format
219 *
220 * Return: the format name string
221 */
222const char *snd_pcm_format_name(snd_pcm_format_t format)
223{
224 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
225 return "Unknown";
226 return snd_pcm_format_names[(__force unsigned int)format];
227}
228EXPORT_SYMBOL_GPL(snd_pcm_format_name);
229
230#ifdef CONFIG_SND_VERBOSE_PROCFS
231
232#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
233#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
234#define READY(v) [SNDRV_PCM_READY_##v] = #v
235#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
236#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
237#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
238#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
239#define START(v) [SNDRV_PCM_START_##v] = #v
240#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
241
242static const char * const snd_pcm_stream_names[] = {
243 STREAM(PLAYBACK),
244 STREAM(CAPTURE),
245};
246
247static const char * const snd_pcm_state_names[] = {
248 STATE(OPEN),
249 STATE(SETUP),
250 STATE(PREPARED),
251 STATE(RUNNING),
252 STATE(XRUN),
253 STATE(DRAINING),
254 STATE(PAUSED),
255 STATE(SUSPENDED),
256};
257
258static const char * const snd_pcm_access_names[] = {
259 ACCESS(MMAP_INTERLEAVED),
260 ACCESS(MMAP_NONINTERLEAVED),
261 ACCESS(MMAP_COMPLEX),
262 ACCESS(RW_INTERLEAVED),
263 ACCESS(RW_NONINTERLEAVED),
264};
265
266static const char * const snd_pcm_subformat_names[] = {
267 SUBFORMAT(STD),
268};
269
270static const char * const snd_pcm_tstamp_mode_names[] = {
271 TSTAMP(NONE),
272 TSTAMP(ENABLE),
273};
274
275static const char *snd_pcm_stream_name(int stream)
276{
277 return snd_pcm_stream_names[stream];
278}
279
280static const char *snd_pcm_access_name(snd_pcm_access_t access)
281{
282 return snd_pcm_access_names[(__force int)access];
283}
284
285static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
286{
287 return snd_pcm_subformat_names[(__force int)subformat];
288}
289
290static const char *snd_pcm_tstamp_mode_name(int mode)
291{
292 return snd_pcm_tstamp_mode_names[mode];
293}
294
295static const char *snd_pcm_state_name(snd_pcm_state_t state)
296{
297 return snd_pcm_state_names[(__force int)state];
298}
299
300#if IS_ENABLED(CONFIG_SND_PCM_OSS)
301#include <linux/soundcard.h>
302
303static const char *snd_pcm_oss_format_name(int format)
304{
305 switch (format) {
306 case AFMT_MU_LAW:
307 return "MU_LAW";
308 case AFMT_A_LAW:
309 return "A_LAW";
310 case AFMT_IMA_ADPCM:
311 return "IMA_ADPCM";
312 case AFMT_U8:
313 return "U8";
314 case AFMT_S16_LE:
315 return "S16_LE";
316 case AFMT_S16_BE:
317 return "S16_BE";
318 case AFMT_S8:
319 return "S8";
320 case AFMT_U16_LE:
321 return "U16_LE";
322 case AFMT_U16_BE:
323 return "U16_BE";
324 case AFMT_MPEG:
325 return "MPEG";
326 default:
327 return "unknown";
328 }
329}
330#endif
331
332static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
333 struct snd_info_buffer *buffer)
334{
335 struct snd_pcm_info *info;
336 int err;
337
338 if (! substream)
339 return;
340
341 info = kmalloc(sizeof(*info), GFP_KERNEL);
342 if (!info)
343 return;
344
345 err = snd_pcm_info(substream, info);
346 if (err < 0) {
347 snd_iprintf(buffer, "error %d\n", err);
348 kfree(info);
349 return;
350 }
351 snd_iprintf(buffer, "card: %d\n", info->card);
352 snd_iprintf(buffer, "device: %d\n", info->device);
353 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
354 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
355 snd_iprintf(buffer, "id: %s\n", info->id);
356 snd_iprintf(buffer, "name: %s\n", info->name);
357 snd_iprintf(buffer, "subname: %s\n", info->subname);
358 snd_iprintf(buffer, "class: %d\n", info->dev_class);
359 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
360 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
361 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
362 kfree(info);
363}
364
365static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
366 struct snd_info_buffer *buffer)
367{
368 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
369 buffer);
370}
371
372static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
373 struct snd_info_buffer *buffer)
374{
375 snd_pcm_proc_info_read(entry->private_data, buffer);
376}
377
378static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
379 struct snd_info_buffer *buffer)
380{
381 struct snd_pcm_substream *substream = entry->private_data;
382 struct snd_pcm_runtime *runtime;
383
384 mutex_lock(&substream->pcm->open_mutex);
385 runtime = substream->runtime;
386 if (!runtime) {
387 snd_iprintf(buffer, "closed\n");
388 goto unlock;
389 }
390 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
391 snd_iprintf(buffer, "no setup\n");
392 goto unlock;
393 }
394 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
395 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
396 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
397 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
398 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
399 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
400 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
401#if IS_ENABLED(CONFIG_SND_PCM_OSS)
402 if (substream->oss.oss) {
403 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
404 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
405 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
406 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
407 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
408 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
409 }
410#endif
411 unlock:
412 mutex_unlock(&substream->pcm->open_mutex);
413}
414
415static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
416 struct snd_info_buffer *buffer)
417{
418 struct snd_pcm_substream *substream = entry->private_data;
419 struct snd_pcm_runtime *runtime;
420
421 mutex_lock(&substream->pcm->open_mutex);
422 runtime = substream->runtime;
423 if (!runtime) {
424 snd_iprintf(buffer, "closed\n");
425 goto unlock;
426 }
427 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
428 snd_iprintf(buffer, "no setup\n");
429 goto unlock;
430 }
431 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
432 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
433 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
434 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
435 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
436 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
437 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
438 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
439 unlock:
440 mutex_unlock(&substream->pcm->open_mutex);
441}
442
443static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
444 struct snd_info_buffer *buffer)
445{
446 struct snd_pcm_substream *substream = entry->private_data;
447 struct snd_pcm_runtime *runtime;
448 struct snd_pcm_status64 status;
449 int err;
450
451 mutex_lock(&substream->pcm->open_mutex);
452 runtime = substream->runtime;
453 if (!runtime) {
454 snd_iprintf(buffer, "closed\n");
455 goto unlock;
456 }
457 memset(&status, 0, sizeof(status));
458 err = snd_pcm_status64(substream, &status);
459 if (err < 0) {
460 snd_iprintf(buffer, "error %d\n", err);
461 goto unlock;
462 }
463 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
464 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
465 snd_iprintf(buffer, "trigger_time: %lld.%09lld\n",
466 status.trigger_tstamp_sec, status.trigger_tstamp_nsec);
467 snd_iprintf(buffer, "tstamp : %lld.%09lld\n",
468 status.tstamp_sec, status.tstamp_nsec);
469 snd_iprintf(buffer, "delay : %ld\n", status.delay);
470 snd_iprintf(buffer, "avail : %ld\n", status.avail);
471 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
472 snd_iprintf(buffer, "-----\n");
473 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
474 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
475 unlock:
476 mutex_unlock(&substream->pcm->open_mutex);
477}
478
479#ifdef CONFIG_SND_PCM_XRUN_DEBUG
480static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
481 struct snd_info_buffer *buffer)
482{
483 struct snd_pcm_substream *substream = entry->private_data;
484
485 snd_pcm_stop_xrun(substream);
486}
487
488static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
489 struct snd_info_buffer *buffer)
490{
491 struct snd_pcm_str *pstr = entry->private_data;
492 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
493}
494
495static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
496 struct snd_info_buffer *buffer)
497{
498 struct snd_pcm_str *pstr = entry->private_data;
499 char line[64];
500 if (!snd_info_get_line(buffer, line, sizeof(line)))
501 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
502}
503#endif
504
505static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
506{
507 struct snd_pcm *pcm = pstr->pcm;
508 struct snd_info_entry *entry;
509 char name[16];
510
511 sprintf(name, "pcm%i%c", pcm->device,
512 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
513 entry = snd_info_create_card_entry(pcm->card, name,
514 pcm->card->proc_root);
515 if (!entry)
516 return -ENOMEM;
517 entry->mode = S_IFDIR | 0555;
518 pstr->proc_root = entry;
519 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
520 if (entry)
521 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
522#ifdef CONFIG_SND_PCM_XRUN_DEBUG
523 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
524 pstr->proc_root);
525 if (entry) {
526 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
527 entry->c.text.write = snd_pcm_xrun_debug_write;
528 entry->mode |= 0200;
529 }
530#endif
531 return 0;
532}
533
534static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
535{
536 snd_info_free_entry(pstr->proc_root);
537 pstr->proc_root = NULL;
538 return 0;
539}
540
541static struct snd_info_entry *
542create_substream_info_entry(struct snd_pcm_substream *substream,
543 const char *name,
544 void (*read)(struct snd_info_entry *,
545 struct snd_info_buffer *))
546{
547 struct snd_info_entry *entry;
548
549 entry = snd_info_create_card_entry(substream->pcm->card, name,
550 substream->proc_root);
551 if (entry)
552 snd_info_set_text_ops(entry, substream, read);
553 return entry;
554}
555
556static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
557{
558 struct snd_info_entry *entry;
559 struct snd_card *card;
560 char name[16];
561
562 card = substream->pcm->card;
563
564 sprintf(name, "sub%i", substream->number);
565 entry = snd_info_create_card_entry(card, name,
566 substream->pstr->proc_root);
567 if (!entry)
568 return -ENOMEM;
569 entry->mode = S_IFDIR | 0555;
570 substream->proc_root = entry;
571
572 create_substream_info_entry(substream, "info",
573 snd_pcm_substream_proc_info_read);
574 create_substream_info_entry(substream, "hw_params",
575 snd_pcm_substream_proc_hw_params_read);
576 create_substream_info_entry(substream, "sw_params",
577 snd_pcm_substream_proc_sw_params_read);
578 create_substream_info_entry(substream, "status",
579 snd_pcm_substream_proc_status_read);
580
581#ifdef CONFIG_SND_PCM_XRUN_DEBUG
582 entry = create_substream_info_entry(substream, "xrun_injection", NULL);
583 if (entry) {
584 entry->c.text.write = snd_pcm_xrun_injection_write;
585 entry->mode = S_IFREG | 0200;
586 }
587#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
588
589 return 0;
590}
591
592#else /* !CONFIG_SND_VERBOSE_PROCFS */
593static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
594static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
595static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
596#endif /* CONFIG_SND_VERBOSE_PROCFS */
597
598static const struct attribute_group *pcm_dev_attr_groups[];
599
600/*
601 * PM callbacks: we need to deal only with suspend here, as the resume is
602 * triggered either from user-space or the driver's resume callback
603 */
604#ifdef CONFIG_PM_SLEEP
605static int do_pcm_suspend(struct device *dev)
606{
607 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
608
609 if (!pstr->pcm->no_device_suspend)
610 snd_pcm_suspend_all(pstr->pcm);
611 return 0;
612}
613#endif
614
615static const struct dev_pm_ops pcm_dev_pm_ops = {
616 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
617};
618
619/* device type for PCM -- basically only for passing PM callbacks */
620static const struct device_type pcm_dev_type = {
621 .name = "pcm",
622 .pm = &pcm_dev_pm_ops,
623};
624
625/**
626 * snd_pcm_new_stream - create a new PCM stream
627 * @pcm: the pcm instance
628 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
629 * @substream_count: the number of substreams
630 *
631 * Creates a new stream for the pcm.
632 * The corresponding stream on the pcm must have been empty before
633 * calling this, i.e. zero must be given to the argument of
634 * snd_pcm_new().
635 *
636 * Return: Zero if successful, or a negative error code on failure.
637 */
638int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
639{
640 int idx, err;
641 struct snd_pcm_str *pstr = &pcm->streams[stream];
642 struct snd_pcm_substream *substream, *prev;
643
644#if IS_ENABLED(CONFIG_SND_PCM_OSS)
645 mutex_init(&pstr->oss.setup_mutex);
646#endif
647 pstr->stream = stream;
648 pstr->pcm = pcm;
649 pstr->substream_count = substream_count;
650 if (!substream_count)
651 return 0;
652
653 snd_device_initialize(&pstr->dev, pcm->card);
654 pstr->dev.groups = pcm_dev_attr_groups;
655 pstr->dev.type = &pcm_dev_type;
656 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
657 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
658
659 if (!pcm->internal) {
660 err = snd_pcm_stream_proc_init(pstr);
661 if (err < 0) {
662 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
663 return err;
664 }
665 }
666 prev = NULL;
667 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
668 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
669 if (!substream)
670 return -ENOMEM;
671 substream->pcm = pcm;
672 substream->pstr = pstr;
673 substream->number = idx;
674 substream->stream = stream;
675 sprintf(substream->name, "subdevice #%i", idx);
676 substream->buffer_bytes_max = UINT_MAX;
677 if (prev == NULL)
678 pstr->substream = substream;
679 else
680 prev->next = substream;
681
682 if (!pcm->internal) {
683 err = snd_pcm_substream_proc_init(substream);
684 if (err < 0) {
685 pcm_err(pcm,
686 "Error in snd_pcm_stream_proc_init\n");
687 if (prev == NULL)
688 pstr->substream = NULL;
689 else
690 prev->next = NULL;
691 kfree(substream);
692 return err;
693 }
694 }
695 substream->group = &substream->self_group;
696 snd_pcm_group_init(&substream->self_group);
697 list_add_tail(&substream->link_list, &substream->self_group.substreams);
698 atomic_set(&substream->mmap_count, 0);
699 prev = substream;
700 }
701 return 0;
702}
703EXPORT_SYMBOL(snd_pcm_new_stream);
704
705static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
706 int playback_count, int capture_count, bool internal,
707 struct snd_pcm **rpcm)
708{
709 struct snd_pcm *pcm;
710 int err;
711 static const struct snd_device_ops ops = {
712 .dev_free = snd_pcm_dev_free,
713 .dev_register = snd_pcm_dev_register,
714 .dev_disconnect = snd_pcm_dev_disconnect,
715 };
716 static const struct snd_device_ops internal_ops = {
717 .dev_free = snd_pcm_dev_free,
718 };
719
720 if (snd_BUG_ON(!card))
721 return -ENXIO;
722 if (rpcm)
723 *rpcm = NULL;
724 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
725 if (!pcm)
726 return -ENOMEM;
727 pcm->card = card;
728 pcm->device = device;
729 pcm->internal = internal;
730 mutex_init(&pcm->open_mutex);
731 init_waitqueue_head(&pcm->open_wait);
732 INIT_LIST_HEAD(&pcm->list);
733 if (id)
734 strscpy(pcm->id, id, sizeof(pcm->id));
735
736 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
737 playback_count);
738 if (err < 0)
739 goto free_pcm;
740
741 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
742 if (err < 0)
743 goto free_pcm;
744
745 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
746 internal ? &internal_ops : &ops);
747 if (err < 0)
748 goto free_pcm;
749
750 if (rpcm)
751 *rpcm = pcm;
752 return 0;
753
754free_pcm:
755 snd_pcm_free(pcm);
756 return err;
757}
758
759/**
760 * snd_pcm_new - create a new PCM instance
761 * @card: the card instance
762 * @id: the id string
763 * @device: the device index (zero based)
764 * @playback_count: the number of substreams for playback
765 * @capture_count: the number of substreams for capture
766 * @rpcm: the pointer to store the new pcm instance
767 *
768 * Creates a new PCM instance.
769 *
770 * The pcm operators have to be set afterwards to the new instance
771 * via snd_pcm_set_ops().
772 *
773 * Return: Zero if successful, or a negative error code on failure.
774 */
775int snd_pcm_new(struct snd_card *card, const char *id, int device,
776 int playback_count, int capture_count, struct snd_pcm **rpcm)
777{
778 return _snd_pcm_new(card, id, device, playback_count, capture_count,
779 false, rpcm);
780}
781EXPORT_SYMBOL(snd_pcm_new);
782
783/**
784 * snd_pcm_new_internal - create a new internal PCM instance
785 * @card: the card instance
786 * @id: the id string
787 * @device: the device index (zero based - shared with normal PCMs)
788 * @playback_count: the number of substreams for playback
789 * @capture_count: the number of substreams for capture
790 * @rpcm: the pointer to store the new pcm instance
791 *
792 * Creates a new internal PCM instance with no userspace device or procfs
793 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
794 * will only be used internally by kernel drivers. i.e. it cannot be opened
795 * by userspace. It provides existing ASoC components drivers with a substream
796 * and access to any private data.
797 *
798 * The pcm operators have to be set afterwards to the new instance
799 * via snd_pcm_set_ops().
800 *
801 * Return: Zero if successful, or a negative error code on failure.
802 */
803int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
804 int playback_count, int capture_count,
805 struct snd_pcm **rpcm)
806{
807 return _snd_pcm_new(card, id, device, playback_count, capture_count,
808 true, rpcm);
809}
810EXPORT_SYMBOL(snd_pcm_new_internal);
811
812static void free_chmap(struct snd_pcm_str *pstr)
813{
814 if (pstr->chmap_kctl) {
815 struct snd_card *card = pstr->pcm->card;
816
817 down_write(&card->controls_rwsem);
818 snd_ctl_remove(card, pstr->chmap_kctl);
819 up_write(&card->controls_rwsem);
820 pstr->chmap_kctl = NULL;
821 }
822}
823
824static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
825{
826 struct snd_pcm_substream *substream, *substream_next;
827#if IS_ENABLED(CONFIG_SND_PCM_OSS)
828 struct snd_pcm_oss_setup *setup, *setupn;
829#endif
830
831 /* free all proc files under the stream */
832 snd_pcm_stream_proc_done(pstr);
833
834 substream = pstr->substream;
835 while (substream) {
836 substream_next = substream->next;
837 snd_pcm_timer_done(substream);
838 kfree(substream);
839 substream = substream_next;
840 }
841#if IS_ENABLED(CONFIG_SND_PCM_OSS)
842 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
843 setupn = setup->next;
844 kfree(setup->task_name);
845 kfree(setup);
846 }
847#endif
848 free_chmap(pstr);
849 if (pstr->substream_count)
850 put_device(&pstr->dev);
851}
852
853#if IS_ENABLED(CONFIG_SND_PCM_OSS)
854#define pcm_call_notify(pcm, call) \
855 do { \
856 struct snd_pcm_notify *_notify; \
857 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
858 _notify->call(pcm); \
859 } while (0)
860#else
861#define pcm_call_notify(pcm, call) do {} while (0)
862#endif
863
864static int snd_pcm_free(struct snd_pcm *pcm)
865{
866 if (!pcm)
867 return 0;
868 if (!pcm->internal)
869 pcm_call_notify(pcm, n_unregister);
870 if (pcm->private_free)
871 pcm->private_free(pcm);
872 snd_pcm_lib_preallocate_free_for_all(pcm);
873 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
874 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
875 kfree(pcm);
876 return 0;
877}
878
879static int snd_pcm_dev_free(struct snd_device *device)
880{
881 struct snd_pcm *pcm = device->device_data;
882 return snd_pcm_free(pcm);
883}
884
885int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
886 struct file *file,
887 struct snd_pcm_substream **rsubstream)
888{
889 struct snd_pcm_str * pstr;
890 struct snd_pcm_substream *substream;
891 struct snd_pcm_runtime *runtime;
892 struct snd_card *card;
893 int prefer_subdevice;
894 size_t size;
895
896 if (snd_BUG_ON(!pcm || !rsubstream))
897 return -ENXIO;
898 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
899 stream != SNDRV_PCM_STREAM_CAPTURE))
900 return -EINVAL;
901 *rsubstream = NULL;
902 pstr = &pcm->streams[stream];
903 if (pstr->substream == NULL || pstr->substream_count == 0)
904 return -ENODEV;
905
906 card = pcm->card;
907 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
908
909 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
910 int opposite = !stream;
911
912 for (substream = pcm->streams[opposite].substream; substream;
913 substream = substream->next) {
914 if (SUBSTREAM_BUSY(substream))
915 return -EAGAIN;
916 }
917 }
918
919 if (file->f_flags & O_APPEND) {
920 if (prefer_subdevice < 0) {
921 if (pstr->substream_count > 1)
922 return -EINVAL; /* must be unique */
923 substream = pstr->substream;
924 } else {
925 for (substream = pstr->substream; substream;
926 substream = substream->next)
927 if (substream->number == prefer_subdevice)
928 break;
929 }
930 if (! substream)
931 return -ENODEV;
932 if (! SUBSTREAM_BUSY(substream))
933 return -EBADFD;
934 substream->ref_count++;
935 *rsubstream = substream;
936 return 0;
937 }
938
939 for (substream = pstr->substream; substream; substream = substream->next) {
940 if (!SUBSTREAM_BUSY(substream) &&
941 (prefer_subdevice == -1 ||
942 substream->number == prefer_subdevice))
943 break;
944 }
945 if (substream == NULL)
946 return -EAGAIN;
947
948 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
949 if (runtime == NULL)
950 return -ENOMEM;
951
952 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
953 runtime->status = alloc_pages_exact(size, GFP_KERNEL);
954 if (runtime->status == NULL) {
955 kfree(runtime);
956 return -ENOMEM;
957 }
958 memset(runtime->status, 0, size);
959
960 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
961 runtime->control = alloc_pages_exact(size, GFP_KERNEL);
962 if (runtime->control == NULL) {
963 free_pages_exact(runtime->status,
964 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
965 kfree(runtime);
966 return -ENOMEM;
967 }
968 memset(runtime->control, 0, size);
969
970 init_waitqueue_head(&runtime->sleep);
971 init_waitqueue_head(&runtime->tsleep);
972
973 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_OPEN);
974 mutex_init(&runtime->buffer_mutex);
975 atomic_set(&runtime->buffer_accessing, 0);
976
977 substream->runtime = runtime;
978 substream->private_data = pcm->private_data;
979 substream->ref_count = 1;
980 substream->f_flags = file->f_flags;
981 substream->pid = get_pid(task_pid(current));
982 pstr->substream_opened++;
983 *rsubstream = substream;
984 return 0;
985}
986
987void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
988{
989 struct snd_pcm_runtime *runtime;
990
991 if (PCM_RUNTIME_CHECK(substream))
992 return;
993 runtime = substream->runtime;
994 if (runtime->private_free != NULL)
995 runtime->private_free(runtime);
996 free_pages_exact(runtime->status,
997 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
998 free_pages_exact(runtime->control,
999 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1000 kfree(runtime->hw_constraints.rules);
1001 /* Avoid concurrent access to runtime via PCM timer interface */
1002 if (substream->timer) {
1003 spin_lock_irq(&substream->timer->lock);
1004 substream->runtime = NULL;
1005 spin_unlock_irq(&substream->timer->lock);
1006 } else {
1007 substream->runtime = NULL;
1008 }
1009 mutex_destroy(&runtime->buffer_mutex);
1010 snd_fasync_free(runtime->fasync);
1011 kfree(runtime);
1012 put_pid(substream->pid);
1013 substream->pid = NULL;
1014 substream->pstr->substream_opened--;
1015}
1016
1017static ssize_t pcm_class_show(struct device *dev,
1018 struct device_attribute *attr, char *buf)
1019{
1020 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1021 struct snd_pcm *pcm = pstr->pcm;
1022 const char *str;
1023 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1024 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1025 [SNDRV_PCM_CLASS_MULTI] = "multi",
1026 [SNDRV_PCM_CLASS_MODEM] = "modem",
1027 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1028 };
1029
1030 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1031 str = "none";
1032 else
1033 str = strs[pcm->dev_class];
1034 return sysfs_emit(buf, "%s\n", str);
1035}
1036
1037static DEVICE_ATTR_RO(pcm_class);
1038static struct attribute *pcm_dev_attrs[] = {
1039 &dev_attr_pcm_class.attr,
1040 NULL
1041};
1042
1043static const struct attribute_group pcm_dev_attr_group = {
1044 .attrs = pcm_dev_attrs,
1045};
1046
1047static const struct attribute_group *pcm_dev_attr_groups[] = {
1048 &pcm_dev_attr_group,
1049 NULL
1050};
1051
1052static int snd_pcm_dev_register(struct snd_device *device)
1053{
1054 int cidx, err;
1055 struct snd_pcm_substream *substream;
1056 struct snd_pcm *pcm;
1057
1058 if (snd_BUG_ON(!device || !device->device_data))
1059 return -ENXIO;
1060 pcm = device->device_data;
1061
1062 mutex_lock(®ister_mutex);
1063 err = snd_pcm_add(pcm);
1064 if (err)
1065 goto unlock;
1066 for (cidx = 0; cidx < 2; cidx++) {
1067 int devtype = -1;
1068 if (pcm->streams[cidx].substream == NULL)
1069 continue;
1070 switch (cidx) {
1071 case SNDRV_PCM_STREAM_PLAYBACK:
1072 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1073 break;
1074 case SNDRV_PCM_STREAM_CAPTURE:
1075 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1076 break;
1077 }
1078 /* register pcm */
1079 err = snd_register_device(devtype, pcm->card, pcm->device,
1080 &snd_pcm_f_ops[cidx], pcm,
1081 &pcm->streams[cidx].dev);
1082 if (err < 0) {
1083 list_del_init(&pcm->list);
1084 goto unlock;
1085 }
1086
1087 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1088 snd_pcm_timer_init(substream);
1089 }
1090
1091 pcm_call_notify(pcm, n_register);
1092
1093 unlock:
1094 mutex_unlock(®ister_mutex);
1095 return err;
1096}
1097
1098static int snd_pcm_dev_disconnect(struct snd_device *device)
1099{
1100 struct snd_pcm *pcm = device->device_data;
1101 struct snd_pcm_substream *substream;
1102 int cidx;
1103
1104 mutex_lock(®ister_mutex);
1105 mutex_lock(&pcm->open_mutex);
1106 wake_up(&pcm->open_wait);
1107 list_del_init(&pcm->list);
1108
1109 for_each_pcm_substream(pcm, cidx, substream) {
1110 snd_pcm_stream_lock_irq(substream);
1111 if (substream->runtime) {
1112 if (snd_pcm_running(substream))
1113 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
1114 /* to be sure, set the state unconditionally */
1115 __snd_pcm_set_state(substream->runtime,
1116 SNDRV_PCM_STATE_DISCONNECTED);
1117 wake_up(&substream->runtime->sleep);
1118 wake_up(&substream->runtime->tsleep);
1119 }
1120 snd_pcm_stream_unlock_irq(substream);
1121 }
1122
1123 for_each_pcm_substream(pcm, cidx, substream)
1124 snd_pcm_sync_stop(substream, false);
1125
1126 pcm_call_notify(pcm, n_disconnect);
1127 for (cidx = 0; cidx < 2; cidx++) {
1128 snd_unregister_device(&pcm->streams[cidx].dev);
1129 free_chmap(&pcm->streams[cidx]);
1130 }
1131 mutex_unlock(&pcm->open_mutex);
1132 mutex_unlock(®ister_mutex);
1133 return 0;
1134}
1135
1136#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1137/**
1138 * snd_pcm_notify - Add/remove the notify list
1139 * @notify: PCM notify list
1140 * @nfree: 0 = register, 1 = unregister
1141 *
1142 * This adds the given notifier to the global list so that the callback is
1143 * called for each registered PCM devices. This exists only for PCM OSS
1144 * emulation, so far.
1145 *
1146 * Return: zero if successful, or a negative error code
1147 */
1148int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1149{
1150 struct snd_pcm *pcm;
1151
1152 if (snd_BUG_ON(!notify ||
1153 !notify->n_register ||
1154 !notify->n_unregister ||
1155 !notify->n_disconnect))
1156 return -EINVAL;
1157 mutex_lock(®ister_mutex);
1158 if (nfree) {
1159 list_del(¬ify->list);
1160 list_for_each_entry(pcm, &snd_pcm_devices, list)
1161 notify->n_unregister(pcm);
1162 } else {
1163 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1164 list_for_each_entry(pcm, &snd_pcm_devices, list)
1165 notify->n_register(pcm);
1166 }
1167 mutex_unlock(®ister_mutex);
1168 return 0;
1169}
1170EXPORT_SYMBOL(snd_pcm_notify);
1171#endif /* CONFIG_SND_PCM_OSS */
1172
1173#ifdef CONFIG_SND_PROC_FS
1174/*
1175 * Info interface
1176 */
1177
1178static void snd_pcm_proc_read(struct snd_info_entry *entry,
1179 struct snd_info_buffer *buffer)
1180{
1181 struct snd_pcm *pcm;
1182
1183 mutex_lock(®ister_mutex);
1184 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1185 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1186 pcm->card->number, pcm->device, pcm->id, pcm->name);
1187 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1188 snd_iprintf(buffer, " : playback %i",
1189 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1190 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1191 snd_iprintf(buffer, " : capture %i",
1192 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1193 snd_iprintf(buffer, "\n");
1194 }
1195 mutex_unlock(®ister_mutex);
1196}
1197
1198static struct snd_info_entry *snd_pcm_proc_entry;
1199
1200static void snd_pcm_proc_init(void)
1201{
1202 struct snd_info_entry *entry;
1203
1204 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1205 if (entry) {
1206 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1207 if (snd_info_register(entry) < 0) {
1208 snd_info_free_entry(entry);
1209 entry = NULL;
1210 }
1211 }
1212 snd_pcm_proc_entry = entry;
1213}
1214
1215static void snd_pcm_proc_done(void)
1216{
1217 snd_info_free_entry(snd_pcm_proc_entry);
1218}
1219
1220#else /* !CONFIG_SND_PROC_FS */
1221#define snd_pcm_proc_init()
1222#define snd_pcm_proc_done()
1223#endif /* CONFIG_SND_PROC_FS */
1224
1225
1226/*
1227 * ENTRY functions
1228 */
1229
1230static int __init alsa_pcm_init(void)
1231{
1232 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1233 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1234 snd_pcm_proc_init();
1235 return 0;
1236}
1237
1238static void __exit alsa_pcm_exit(void)
1239{
1240 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1241 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1242 snd_pcm_proc_done();
1243}
1244
1245module_init(alsa_pcm_init)
1246module_exit(alsa_pcm_exit)