Loading...
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/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->internal)
53 continue;
54 if (pcm->card == card && pcm->device == device)
55 return pcm;
56 }
57 return NULL;
58}
59
60static int snd_pcm_next(struct snd_card *card, int device)
61{
62 struct snd_pcm *pcm;
63
64 list_for_each_entry(pcm, &snd_pcm_devices, list) {
65 if (pcm->internal)
66 continue;
67 if (pcm->card == card && pcm->device > device)
68 return pcm->device;
69 else if (pcm->card->number > card->number)
70 return -1;
71 }
72 return -1;
73}
74
75static int snd_pcm_add(struct snd_pcm *newpcm)
76{
77 struct snd_pcm *pcm;
78
79 list_for_each_entry(pcm, &snd_pcm_devices, list) {
80 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
81 return -EBUSY;
82 if (pcm->card->number > newpcm->card->number ||
83 (pcm->card == newpcm->card &&
84 pcm->device > newpcm->device)) {
85 list_add(&newpcm->list, pcm->list.prev);
86 return 0;
87 }
88 }
89 list_add_tail(&newpcm->list, &snd_pcm_devices);
90 return 0;
91}
92
93static int snd_pcm_control_ioctl(struct snd_card *card,
94 struct snd_ctl_file *control,
95 unsigned int cmd, unsigned long arg)
96{
97 switch (cmd) {
98 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
99 {
100 int device;
101
102 if (get_user(device, (int __user *)arg))
103 return -EFAULT;
104 mutex_lock(®ister_mutex);
105 device = snd_pcm_next(card, device);
106 mutex_unlock(®ister_mutex);
107 if (put_user(device, (int __user *)arg))
108 return -EFAULT;
109 return 0;
110 }
111 case SNDRV_CTL_IOCTL_PCM_INFO:
112 {
113 struct snd_pcm_info __user *info;
114 unsigned int device, subdevice;
115 int stream;
116 struct snd_pcm *pcm;
117 struct snd_pcm_str *pstr;
118 struct snd_pcm_substream *substream;
119 int err;
120
121 info = (struct snd_pcm_info __user *)arg;
122 if (get_user(device, &info->device))
123 return -EFAULT;
124 if (get_user(stream, &info->stream))
125 return -EFAULT;
126 if (stream < 0 || stream > 1)
127 return -EINVAL;
128 if (get_user(subdevice, &info->subdevice))
129 return -EFAULT;
130 mutex_lock(®ister_mutex);
131 pcm = snd_pcm_get(card, device);
132 if (pcm == NULL) {
133 err = -ENXIO;
134 goto _error;
135 }
136 pstr = &pcm->streams[stream];
137 if (pstr->substream_count == 0) {
138 err = -ENOENT;
139 goto _error;
140 }
141 if (subdevice >= pstr->substream_count) {
142 err = -ENXIO;
143 goto _error;
144 }
145 for (substream = pstr->substream; substream;
146 substream = substream->next)
147 if (substream->number == (int)subdevice)
148 break;
149 if (substream == NULL) {
150 err = -ENXIO;
151 goto _error;
152 }
153 err = snd_pcm_info_user(substream, info);
154 _error:
155 mutex_unlock(®ister_mutex);
156 return err;
157 }
158 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
159 {
160 int val;
161
162 if (get_user(val, (int __user *)arg))
163 return -EFAULT;
164 control->prefer_pcm_subdevice = val;
165 return 0;
166 }
167 }
168 return -ENOIOCTLCMD;
169}
170
171#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
172
173static char *snd_pcm_format_names[] = {
174 FORMAT(S8),
175 FORMAT(U8),
176 FORMAT(S16_LE),
177 FORMAT(S16_BE),
178 FORMAT(U16_LE),
179 FORMAT(U16_BE),
180 FORMAT(S24_LE),
181 FORMAT(S24_BE),
182 FORMAT(U24_LE),
183 FORMAT(U24_BE),
184 FORMAT(S32_LE),
185 FORMAT(S32_BE),
186 FORMAT(U32_LE),
187 FORMAT(U32_BE),
188 FORMAT(FLOAT_LE),
189 FORMAT(FLOAT_BE),
190 FORMAT(FLOAT64_LE),
191 FORMAT(FLOAT64_BE),
192 FORMAT(IEC958_SUBFRAME_LE),
193 FORMAT(IEC958_SUBFRAME_BE),
194 FORMAT(MU_LAW),
195 FORMAT(A_LAW),
196 FORMAT(IMA_ADPCM),
197 FORMAT(MPEG),
198 FORMAT(GSM),
199 FORMAT(SPECIAL),
200 FORMAT(S24_3LE),
201 FORMAT(S24_3BE),
202 FORMAT(U24_3LE),
203 FORMAT(U24_3BE),
204 FORMAT(S20_3LE),
205 FORMAT(S20_3BE),
206 FORMAT(U20_3LE),
207 FORMAT(U20_3BE),
208 FORMAT(S18_3LE),
209 FORMAT(S18_3BE),
210 FORMAT(U18_3LE),
211 FORMAT(U18_3BE),
212 FORMAT(G723_24),
213 FORMAT(G723_24_1B),
214 FORMAT(G723_40),
215 FORMAT(G723_40_1B),
216 FORMAT(DSD_U8),
217 FORMAT(DSD_U16_LE),
218};
219
220const char *snd_pcm_format_name(snd_pcm_format_t format)
221{
222 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
223 return "Unknown";
224 return snd_pcm_format_names[(__force unsigned int)format];
225}
226EXPORT_SYMBOL_GPL(snd_pcm_format_name);
227
228#ifdef CONFIG_SND_VERBOSE_PROCFS
229
230#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
231#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
232#define READY(v) [SNDRV_PCM_READY_##v] = #v
233#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
234#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
235#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
236#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
237#define START(v) [SNDRV_PCM_START_##v] = #v
238#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
239
240static char *snd_pcm_stream_names[] = {
241 STREAM(PLAYBACK),
242 STREAM(CAPTURE),
243};
244
245static char *snd_pcm_state_names[] = {
246 STATE(OPEN),
247 STATE(SETUP),
248 STATE(PREPARED),
249 STATE(RUNNING),
250 STATE(XRUN),
251 STATE(DRAINING),
252 STATE(PAUSED),
253 STATE(SUSPENDED),
254};
255
256static char *snd_pcm_access_names[] = {
257 ACCESS(MMAP_INTERLEAVED),
258 ACCESS(MMAP_NONINTERLEAVED),
259 ACCESS(MMAP_COMPLEX),
260 ACCESS(RW_INTERLEAVED),
261 ACCESS(RW_NONINTERLEAVED),
262};
263
264static char *snd_pcm_subformat_names[] = {
265 SUBFORMAT(STD),
266};
267
268static char *snd_pcm_tstamp_mode_names[] = {
269 TSTAMP(NONE),
270 TSTAMP(ENABLE),
271};
272
273static const char *snd_pcm_stream_name(int stream)
274{
275 return snd_pcm_stream_names[stream];
276}
277
278static const char *snd_pcm_access_name(snd_pcm_access_t access)
279{
280 return snd_pcm_access_names[(__force int)access];
281}
282
283static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
284{
285 return snd_pcm_subformat_names[(__force int)subformat];
286}
287
288static const char *snd_pcm_tstamp_mode_name(int mode)
289{
290 return snd_pcm_tstamp_mode_names[mode];
291}
292
293static const char *snd_pcm_state_name(snd_pcm_state_t state)
294{
295 return snd_pcm_state_names[(__force int)state];
296}
297
298#if IS_ENABLED(CONFIG_SND_PCM_OSS)
299#include <linux/soundcard.h>
300
301static const char *snd_pcm_oss_format_name(int format)
302{
303 switch (format) {
304 case AFMT_MU_LAW:
305 return "MU_LAW";
306 case AFMT_A_LAW:
307 return "A_LAW";
308 case AFMT_IMA_ADPCM:
309 return "IMA_ADPCM";
310 case AFMT_U8:
311 return "U8";
312 case AFMT_S16_LE:
313 return "S16_LE";
314 case AFMT_S16_BE:
315 return "S16_BE";
316 case AFMT_S8:
317 return "S8";
318 case AFMT_U16_LE:
319 return "U16_LE";
320 case AFMT_U16_BE:
321 return "U16_BE";
322 case AFMT_MPEG:
323 return "MPEG";
324 default:
325 return "unknown";
326 }
327}
328#endif
329
330static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
331 struct snd_info_buffer *buffer)
332{
333 struct snd_pcm_info *info;
334 int err;
335
336 if (! substream)
337 return;
338
339 info = kmalloc(sizeof(*info), GFP_KERNEL);
340 if (! info) {
341 pcm_dbg(substream->pcm,
342 "snd_pcm_proc_info_read: cannot malloc\n");
343 return;
344 }
345
346 err = snd_pcm_info(substream, info);
347 if (err < 0) {
348 snd_iprintf(buffer, "error %d\n", err);
349 kfree(info);
350 return;
351 }
352 snd_iprintf(buffer, "card: %d\n", info->card);
353 snd_iprintf(buffer, "device: %d\n", info->device);
354 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
355 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
356 snd_iprintf(buffer, "id: %s\n", info->id);
357 snd_iprintf(buffer, "name: %s\n", info->name);
358 snd_iprintf(buffer, "subname: %s\n", info->subname);
359 snd_iprintf(buffer, "class: %d\n", info->dev_class);
360 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
361 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
362 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
363 kfree(info);
364}
365
366static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
367 struct snd_info_buffer *buffer)
368{
369 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
370 buffer);
371}
372
373static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
374 struct snd_info_buffer *buffer)
375{
376 snd_pcm_proc_info_read(entry->private_data, buffer);
377}
378
379static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
380 struct snd_info_buffer *buffer)
381{
382 struct snd_pcm_substream *substream = entry->private_data;
383 struct snd_pcm_runtime *runtime;
384
385 mutex_lock(&substream->pcm->open_mutex);
386 runtime = substream->runtime;
387 if (!runtime) {
388 snd_iprintf(buffer, "closed\n");
389 goto unlock;
390 }
391 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
392 snd_iprintf(buffer, "no setup\n");
393 goto unlock;
394 }
395 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
396 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
397 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
398 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
399 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
400 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
401 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
402#if IS_ENABLED(CONFIG_SND_PCM_OSS)
403 if (substream->oss.oss) {
404 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
405 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
406 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
407 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
408 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
409 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
410 }
411#endif
412 unlock:
413 mutex_unlock(&substream->pcm->open_mutex);
414}
415
416static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
417 struct snd_info_buffer *buffer)
418{
419 struct snd_pcm_substream *substream = entry->private_data;
420 struct snd_pcm_runtime *runtime;
421
422 mutex_lock(&substream->pcm->open_mutex);
423 runtime = substream->runtime;
424 if (!runtime) {
425 snd_iprintf(buffer, "closed\n");
426 goto unlock;
427 }
428 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
429 snd_iprintf(buffer, "no setup\n");
430 goto unlock;
431 }
432 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
433 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
434 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
435 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
436 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
437 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
438 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
439 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
440 unlock:
441 mutex_unlock(&substream->pcm->open_mutex);
442}
443
444static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
445 struct snd_info_buffer *buffer)
446{
447 struct snd_pcm_substream *substream = entry->private_data;
448 struct snd_pcm_runtime *runtime;
449 struct snd_pcm_status status;
450 int err;
451
452 mutex_lock(&substream->pcm->open_mutex);
453 runtime = substream->runtime;
454 if (!runtime) {
455 snd_iprintf(buffer, "closed\n");
456 goto unlock;
457 }
458 memset(&status, 0, sizeof(status));
459 err = snd_pcm_status(substream, &status);
460 if (err < 0) {
461 snd_iprintf(buffer, "error %d\n", err);
462 goto unlock;
463 }
464 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
465 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
466 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
467 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
468 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
469 status.tstamp.tv_sec, status.tstamp.tv_nsec);
470 snd_iprintf(buffer, "delay : %ld\n", status.delay);
471 snd_iprintf(buffer, "avail : %ld\n", status.avail);
472 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
473 snd_iprintf(buffer, "-----\n");
474 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
475 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
476 unlock:
477 mutex_unlock(&substream->pcm->open_mutex);
478}
479
480#ifdef CONFIG_SND_PCM_XRUN_DEBUG
481static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
482 struct snd_info_buffer *buffer)
483{
484 struct snd_pcm_str *pstr = entry->private_data;
485 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
486}
487
488static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
489 struct snd_info_buffer *buffer)
490{
491 struct snd_pcm_str *pstr = entry->private_data;
492 char line[64];
493 if (!snd_info_get_line(buffer, line, sizeof(line)))
494 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
495}
496#endif
497
498static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
499{
500 struct snd_pcm *pcm = pstr->pcm;
501 struct snd_info_entry *entry;
502 char name[16];
503
504 sprintf(name, "pcm%i%c", pcm->device,
505 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
506 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
507 return -ENOMEM;
508 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
509 if (snd_info_register(entry) < 0) {
510 snd_info_free_entry(entry);
511 return -ENOMEM;
512 }
513 pstr->proc_root = entry;
514
515 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
516 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
517 if (snd_info_register(entry) < 0) {
518 snd_info_free_entry(entry);
519 entry = NULL;
520 }
521 }
522 pstr->proc_info_entry = entry;
523
524#ifdef CONFIG_SND_PCM_XRUN_DEBUG
525 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
526 pstr->proc_root)) != NULL) {
527 entry->c.text.read = snd_pcm_xrun_debug_read;
528 entry->c.text.write = snd_pcm_xrun_debug_write;
529 entry->mode |= S_IWUSR;
530 entry->private_data = pstr;
531 if (snd_info_register(entry) < 0) {
532 snd_info_free_entry(entry);
533 entry = NULL;
534 }
535 }
536 pstr->proc_xrun_debug_entry = entry;
537#endif
538 return 0;
539}
540
541static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
542{
543#ifdef CONFIG_SND_PCM_XRUN_DEBUG
544 snd_info_free_entry(pstr->proc_xrun_debug_entry);
545 pstr->proc_xrun_debug_entry = NULL;
546#endif
547 snd_info_free_entry(pstr->proc_info_entry);
548 pstr->proc_info_entry = NULL;
549 snd_info_free_entry(pstr->proc_root);
550 pstr->proc_root = NULL;
551 return 0;
552}
553
554static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
555{
556 struct snd_info_entry *entry;
557 struct snd_card *card;
558 char name[16];
559
560 card = substream->pcm->card;
561
562 sprintf(name, "sub%i", substream->number);
563 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
564 return -ENOMEM;
565 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
566 if (snd_info_register(entry) < 0) {
567 snd_info_free_entry(entry);
568 return -ENOMEM;
569 }
570 substream->proc_root = entry;
571
572 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
573 snd_info_set_text_ops(entry, substream,
574 snd_pcm_substream_proc_info_read);
575 if (snd_info_register(entry) < 0) {
576 snd_info_free_entry(entry);
577 entry = NULL;
578 }
579 }
580 substream->proc_info_entry = entry;
581
582 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
583 snd_info_set_text_ops(entry, substream,
584 snd_pcm_substream_proc_hw_params_read);
585 if (snd_info_register(entry) < 0) {
586 snd_info_free_entry(entry);
587 entry = NULL;
588 }
589 }
590 substream->proc_hw_params_entry = entry;
591
592 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
593 snd_info_set_text_ops(entry, substream,
594 snd_pcm_substream_proc_sw_params_read);
595 if (snd_info_register(entry) < 0) {
596 snd_info_free_entry(entry);
597 entry = NULL;
598 }
599 }
600 substream->proc_sw_params_entry = entry;
601
602 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
603 snd_info_set_text_ops(entry, substream,
604 snd_pcm_substream_proc_status_read);
605 if (snd_info_register(entry) < 0) {
606 snd_info_free_entry(entry);
607 entry = NULL;
608 }
609 }
610 substream->proc_status_entry = entry;
611
612 return 0;
613}
614
615static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
616{
617 snd_info_free_entry(substream->proc_info_entry);
618 substream->proc_info_entry = NULL;
619 snd_info_free_entry(substream->proc_hw_params_entry);
620 substream->proc_hw_params_entry = NULL;
621 snd_info_free_entry(substream->proc_sw_params_entry);
622 substream->proc_sw_params_entry = NULL;
623 snd_info_free_entry(substream->proc_status_entry);
624 substream->proc_status_entry = NULL;
625 snd_info_free_entry(substream->proc_root);
626 substream->proc_root = NULL;
627 return 0;
628}
629#else /* !CONFIG_SND_VERBOSE_PROCFS */
630static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
631static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
632static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
633static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
634#endif /* CONFIG_SND_VERBOSE_PROCFS */
635
636/**
637 * snd_pcm_new_stream - create a new PCM stream
638 * @pcm: the pcm instance
639 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
640 * @substream_count: the number of substreams
641 *
642 * Creates a new stream for the pcm.
643 * The corresponding stream on the pcm must have been empty before
644 * calling this, i.e. zero must be given to the argument of
645 * snd_pcm_new().
646 *
647 * Return: Zero if successful, or a negative error code on failure.
648 */
649int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
650{
651 int idx, err;
652 struct snd_pcm_str *pstr = &pcm->streams[stream];
653 struct snd_pcm_substream *substream, *prev;
654
655#if IS_ENABLED(CONFIG_SND_PCM_OSS)
656 mutex_init(&pstr->oss.setup_mutex);
657#endif
658 pstr->stream = stream;
659 pstr->pcm = pcm;
660 pstr->substream_count = substream_count;
661 if (substream_count > 0 && !pcm->internal) {
662 err = snd_pcm_stream_proc_init(pstr);
663 if (err < 0) {
664 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
665 return err;
666 }
667 }
668 prev = NULL;
669 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
670 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
671 if (substream == NULL) {
672 pcm_err(pcm, "Cannot allocate PCM substream\n");
673 return -ENOMEM;
674 }
675 substream->pcm = pcm;
676 substream->pstr = pstr;
677 substream->number = idx;
678 substream->stream = stream;
679 sprintf(substream->name, "subdevice #%i", idx);
680 substream->buffer_bytes_max = UINT_MAX;
681 if (prev == NULL)
682 pstr->substream = substream;
683 else
684 prev->next = substream;
685
686 if (!pcm->internal) {
687 err = snd_pcm_substream_proc_init(substream);
688 if (err < 0) {
689 pcm_err(pcm,
690 "Error in snd_pcm_stream_proc_init\n");
691 if (prev == NULL)
692 pstr->substream = NULL;
693 else
694 prev->next = NULL;
695 kfree(substream);
696 return err;
697 }
698 }
699 substream->group = &substream->self_group;
700 spin_lock_init(&substream->self_group.lock);
701 INIT_LIST_HEAD(&substream->self_group.substreams);
702 list_add_tail(&substream->link_list, &substream->self_group.substreams);
703 atomic_set(&substream->mmap_count, 0);
704 prev = substream;
705 }
706 return 0;
707}
708
709EXPORT_SYMBOL(snd_pcm_new_stream);
710
711static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
712 int playback_count, int capture_count, bool internal,
713 struct snd_pcm **rpcm)
714{
715 struct snd_pcm *pcm;
716 int err;
717 static struct snd_device_ops ops = {
718 .dev_free = snd_pcm_dev_free,
719 .dev_register = snd_pcm_dev_register,
720 .dev_disconnect = snd_pcm_dev_disconnect,
721 };
722
723 if (snd_BUG_ON(!card))
724 return -ENXIO;
725 if (rpcm)
726 *rpcm = NULL;
727 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
728 if (pcm == NULL) {
729 dev_err(card->dev, "Cannot allocate PCM\n");
730 return -ENOMEM;
731 }
732 pcm->card = card;
733 pcm->device = device;
734 pcm->internal = internal;
735 if (id)
736 strlcpy(pcm->id, id, sizeof(pcm->id));
737 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
738 snd_pcm_free(pcm);
739 return err;
740 }
741 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
742 snd_pcm_free(pcm);
743 return err;
744 }
745 mutex_init(&pcm->open_mutex);
746 init_waitqueue_head(&pcm->open_wait);
747 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
748 snd_pcm_free(pcm);
749 return err;
750 }
751 if (rpcm)
752 *rpcm = pcm;
753 return 0;
754}
755
756/**
757 * snd_pcm_new - create a new PCM instance
758 * @card: the card instance
759 * @id: the id string
760 * @device: the device index (zero based)
761 * @playback_count: the number of substreams for playback
762 * @capture_count: the number of substreams for capture
763 * @rpcm: the pointer to store the new pcm instance
764 *
765 * Creates a new PCM instance.
766 *
767 * The pcm operators have to be set afterwards to the new instance
768 * via snd_pcm_set_ops().
769 *
770 * Return: Zero if successful, or a negative error code on failure.
771 */
772int snd_pcm_new(struct snd_card *card, const char *id, int device,
773 int playback_count, int capture_count, struct snd_pcm **rpcm)
774{
775 return _snd_pcm_new(card, id, device, playback_count, capture_count,
776 false, rpcm);
777}
778EXPORT_SYMBOL(snd_pcm_new);
779
780/**
781 * snd_pcm_new_internal - create a new internal PCM instance
782 * @card: the card instance
783 * @id: the id string
784 * @device: the device index (zero based - shared with normal PCMs)
785 * @playback_count: the number of substreams for playback
786 * @capture_count: the number of substreams for capture
787 * @rpcm: the pointer to store the new pcm instance
788 *
789 * Creates a new internal PCM instance with no userspace device or procfs
790 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
791 * will only be used internally by kernel drivers. i.e. it cannot be opened
792 * by userspace. It provides existing ASoC components drivers with a substream
793 * and access to any private data.
794 *
795 * The pcm operators have to be set afterwards to the new instance
796 * via snd_pcm_set_ops().
797 *
798 * Return: Zero if successful, or a negative error code on failure.
799 */
800int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
801 int playback_count, int capture_count,
802 struct snd_pcm **rpcm)
803{
804 return _snd_pcm_new(card, id, device, playback_count, capture_count,
805 true, rpcm);
806}
807EXPORT_SYMBOL(snd_pcm_new_internal);
808
809static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
810{
811 struct snd_pcm_substream *substream, *substream_next;
812#if IS_ENABLED(CONFIG_SND_PCM_OSS)
813 struct snd_pcm_oss_setup *setup, *setupn;
814#endif
815 substream = pstr->substream;
816 while (substream) {
817 substream_next = substream->next;
818 snd_pcm_timer_done(substream);
819 snd_pcm_substream_proc_done(substream);
820 kfree(substream);
821 substream = substream_next;
822 }
823 snd_pcm_stream_proc_done(pstr);
824#if IS_ENABLED(CONFIG_SND_PCM_OSS)
825 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
826 setupn = setup->next;
827 kfree(setup->task_name);
828 kfree(setup);
829 }
830#endif
831}
832
833static int snd_pcm_free(struct snd_pcm *pcm)
834{
835 struct snd_pcm_notify *notify;
836
837 if (!pcm)
838 return 0;
839 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
840 notify->n_unregister(pcm);
841 }
842 if (pcm->private_free)
843 pcm->private_free(pcm);
844 snd_pcm_lib_preallocate_free_for_all(pcm);
845 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
846 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
847 kfree(pcm);
848 return 0;
849}
850
851static int snd_pcm_dev_free(struct snd_device *device)
852{
853 struct snd_pcm *pcm = device->device_data;
854 return snd_pcm_free(pcm);
855}
856
857int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
858 struct file *file,
859 struct snd_pcm_substream **rsubstream)
860{
861 struct snd_pcm_str * pstr;
862 struct snd_pcm_substream *substream;
863 struct snd_pcm_runtime *runtime;
864 struct snd_ctl_file *kctl;
865 struct snd_card *card;
866 int prefer_subdevice = -1;
867 size_t size;
868
869 if (snd_BUG_ON(!pcm || !rsubstream))
870 return -ENXIO;
871 *rsubstream = NULL;
872 pstr = &pcm->streams[stream];
873 if (pstr->substream == NULL || pstr->substream_count == 0)
874 return -ENODEV;
875
876 card = pcm->card;
877 read_lock(&card->ctl_files_rwlock);
878 list_for_each_entry(kctl, &card->ctl_files, list) {
879 if (kctl->pid == task_pid(current)) {
880 prefer_subdevice = kctl->prefer_pcm_subdevice;
881 if (prefer_subdevice != -1)
882 break;
883 }
884 }
885 read_unlock(&card->ctl_files_rwlock);
886
887 switch (stream) {
888 case SNDRV_PCM_STREAM_PLAYBACK:
889 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
890 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
891 if (SUBSTREAM_BUSY(substream))
892 return -EAGAIN;
893 }
894 }
895 break;
896 case SNDRV_PCM_STREAM_CAPTURE:
897 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
898 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
899 if (SUBSTREAM_BUSY(substream))
900 return -EAGAIN;
901 }
902 }
903 break;
904 default:
905 return -EINVAL;
906 }
907
908 if (file->f_flags & O_APPEND) {
909 if (prefer_subdevice < 0) {
910 if (pstr->substream_count > 1)
911 return -EINVAL; /* must be unique */
912 substream = pstr->substream;
913 } else {
914 for (substream = pstr->substream; substream;
915 substream = substream->next)
916 if (substream->number == prefer_subdevice)
917 break;
918 }
919 if (! substream)
920 return -ENODEV;
921 if (! SUBSTREAM_BUSY(substream))
922 return -EBADFD;
923 substream->ref_count++;
924 *rsubstream = substream;
925 return 0;
926 }
927
928 if (prefer_subdevice >= 0) {
929 for (substream = pstr->substream; substream; substream = substream->next)
930 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
931 goto __ok;
932 }
933 for (substream = pstr->substream; substream; substream = substream->next)
934 if (!SUBSTREAM_BUSY(substream))
935 break;
936 __ok:
937 if (substream == NULL)
938 return -EAGAIN;
939
940 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
941 if (runtime == NULL)
942 return -ENOMEM;
943
944 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
945 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
946 if (runtime->status == NULL) {
947 kfree(runtime);
948 return -ENOMEM;
949 }
950 memset((void*)runtime->status, 0, size);
951
952 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
953 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
954 if (runtime->control == NULL) {
955 snd_free_pages((void*)runtime->status,
956 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
957 kfree(runtime);
958 return -ENOMEM;
959 }
960 memset((void*)runtime->control, 0, size);
961
962 init_waitqueue_head(&runtime->sleep);
963 init_waitqueue_head(&runtime->tsleep);
964
965 runtime->status->state = SNDRV_PCM_STATE_OPEN;
966
967 substream->runtime = runtime;
968 substream->private_data = pcm->private_data;
969 substream->ref_count = 1;
970 substream->f_flags = file->f_flags;
971 substream->pid = get_pid(task_pid(current));
972 pstr->substream_opened++;
973 *rsubstream = substream;
974 return 0;
975}
976
977void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
978{
979 struct snd_pcm_runtime *runtime;
980
981 if (PCM_RUNTIME_CHECK(substream))
982 return;
983 runtime = substream->runtime;
984 if (runtime->private_free != NULL)
985 runtime->private_free(runtime);
986 snd_free_pages((void*)runtime->status,
987 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
988 snd_free_pages((void*)runtime->control,
989 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
990 kfree(runtime->hw_constraints.rules);
991#ifdef CONFIG_SND_PCM_XRUN_DEBUG
992 kfree(runtime->hwptr_log);
993#endif
994 kfree(runtime);
995 substream->runtime = NULL;
996 put_pid(substream->pid);
997 substream->pid = NULL;
998 substream->pstr->substream_opened--;
999}
1000
1001static ssize_t show_pcm_class(struct device *dev,
1002 struct device_attribute *attr, char *buf)
1003{
1004 struct snd_pcm *pcm;
1005 const char *str;
1006 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1007 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1008 [SNDRV_PCM_CLASS_MULTI] = "multi",
1009 [SNDRV_PCM_CLASS_MODEM] = "modem",
1010 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1011 };
1012
1013 if (! (pcm = dev_get_drvdata(dev)) ||
1014 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1015 str = "none";
1016 else
1017 str = strs[pcm->dev_class];
1018 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1019}
1020
1021static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1022static struct attribute *pcm_dev_attrs[] = {
1023 &dev_attr_pcm_class.attr,
1024 NULL
1025};
1026
1027static struct attribute_group pcm_dev_attr_group = {
1028 .attrs = pcm_dev_attrs,
1029};
1030
1031static const struct attribute_group *pcm_dev_attr_groups[] = {
1032 &pcm_dev_attr_group,
1033 NULL
1034};
1035
1036static int snd_pcm_dev_register(struct snd_device *device)
1037{
1038 int cidx, err;
1039 struct snd_pcm_substream *substream;
1040 struct snd_pcm_notify *notify;
1041 char str[16];
1042 struct snd_pcm *pcm;
1043 struct device *dev;
1044
1045 if (snd_BUG_ON(!device || !device->device_data))
1046 return -ENXIO;
1047 pcm = device->device_data;
1048 mutex_lock(®ister_mutex);
1049 err = snd_pcm_add(pcm);
1050 if (err) {
1051 mutex_unlock(®ister_mutex);
1052 return err;
1053 }
1054 for (cidx = 0; cidx < 2; cidx++) {
1055 int devtype = -1;
1056 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1057 continue;
1058 switch (cidx) {
1059 case SNDRV_PCM_STREAM_PLAYBACK:
1060 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1061 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1062 break;
1063 case SNDRV_PCM_STREAM_CAPTURE:
1064 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1065 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1066 break;
1067 }
1068 /* device pointer to use, pcm->dev takes precedence if
1069 * it is assigned, otherwise fall back to card's device
1070 * if possible */
1071 dev = pcm->dev;
1072 if (!dev)
1073 dev = snd_card_get_device_link(pcm->card);
1074 /* register pcm */
1075 err = snd_register_device_for_dev(devtype, pcm->card,
1076 pcm->device,
1077 &snd_pcm_f_ops[cidx],
1078 pcm, str, dev);
1079 if (err < 0) {
1080 list_del(&pcm->list);
1081 mutex_unlock(®ister_mutex);
1082 return err;
1083 }
1084
1085 dev = snd_get_device(devtype, pcm->card, pcm->device);
1086 if (dev) {
1087 err = sysfs_create_groups(&dev->kobj,
1088 pcm_dev_attr_groups);
1089 if (err < 0)
1090 dev_warn(dev,
1091 "pcm %d:%d: cannot create sysfs groups\n",
1092 pcm->card->number, pcm->device);
1093 put_device(dev);
1094 }
1095
1096 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1097 snd_pcm_timer_init(substream);
1098 }
1099
1100 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1101 notify->n_register(pcm);
1102
1103 mutex_unlock(®ister_mutex);
1104 return 0;
1105}
1106
1107static int snd_pcm_dev_disconnect(struct snd_device *device)
1108{
1109 struct snd_pcm *pcm = device->device_data;
1110 struct snd_pcm_notify *notify;
1111 struct snd_pcm_substream *substream;
1112 int cidx, devtype;
1113
1114 mutex_lock(®ister_mutex);
1115 if (list_empty(&pcm->list))
1116 goto unlock;
1117
1118 mutex_lock(&pcm->open_mutex);
1119 wake_up(&pcm->open_wait);
1120 list_del_init(&pcm->list);
1121 for (cidx = 0; cidx < 2; cidx++)
1122 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1123 snd_pcm_stream_lock_irq(substream);
1124 if (substream->runtime) {
1125 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1126 wake_up(&substream->runtime->sleep);
1127 wake_up(&substream->runtime->tsleep);
1128 }
1129 snd_pcm_stream_unlock_irq(substream);
1130 }
1131 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1132 notify->n_disconnect(pcm);
1133 }
1134 for (cidx = 0; cidx < 2; cidx++) {
1135 devtype = -1;
1136 switch (cidx) {
1137 case SNDRV_PCM_STREAM_PLAYBACK:
1138 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1139 break;
1140 case SNDRV_PCM_STREAM_CAPTURE:
1141 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1142 break;
1143 }
1144 snd_unregister_device(devtype, pcm->card, pcm->device);
1145 if (pcm->streams[cidx].chmap_kctl) {
1146 snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1147 pcm->streams[cidx].chmap_kctl = NULL;
1148 }
1149 }
1150 mutex_unlock(&pcm->open_mutex);
1151 unlock:
1152 mutex_unlock(®ister_mutex);
1153 return 0;
1154}
1155
1156int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1157{
1158 struct snd_pcm *pcm;
1159
1160 if (snd_BUG_ON(!notify ||
1161 !notify->n_register ||
1162 !notify->n_unregister ||
1163 !notify->n_disconnect))
1164 return -EINVAL;
1165 mutex_lock(®ister_mutex);
1166 if (nfree) {
1167 list_del(¬ify->list);
1168 list_for_each_entry(pcm, &snd_pcm_devices, list)
1169 notify->n_unregister(pcm);
1170 } else {
1171 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1172 list_for_each_entry(pcm, &snd_pcm_devices, list)
1173 notify->n_register(pcm);
1174 }
1175 mutex_unlock(®ister_mutex);
1176 return 0;
1177}
1178
1179EXPORT_SYMBOL(snd_pcm_notify);
1180
1181#ifdef CONFIG_PROC_FS
1182/*
1183 * Info interface
1184 */
1185
1186static void snd_pcm_proc_read(struct snd_info_entry *entry,
1187 struct snd_info_buffer *buffer)
1188{
1189 struct snd_pcm *pcm;
1190
1191 mutex_lock(®ister_mutex);
1192 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1193 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1194 pcm->card->number, pcm->device, pcm->id, pcm->name);
1195 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1196 snd_iprintf(buffer, " : playback %i",
1197 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1198 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1199 snd_iprintf(buffer, " : capture %i",
1200 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1201 snd_iprintf(buffer, "\n");
1202 }
1203 mutex_unlock(®ister_mutex);
1204}
1205
1206static struct snd_info_entry *snd_pcm_proc_entry;
1207
1208static void snd_pcm_proc_init(void)
1209{
1210 struct snd_info_entry *entry;
1211
1212 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1213 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1214 if (snd_info_register(entry) < 0) {
1215 snd_info_free_entry(entry);
1216 entry = NULL;
1217 }
1218 }
1219 snd_pcm_proc_entry = entry;
1220}
1221
1222static void snd_pcm_proc_done(void)
1223{
1224 snd_info_free_entry(snd_pcm_proc_entry);
1225}
1226
1227#else /* !CONFIG_PROC_FS */
1228#define snd_pcm_proc_init()
1229#define snd_pcm_proc_done()
1230#endif /* CONFIG_PROC_FS */
1231
1232
1233/*
1234 * ENTRY functions
1235 */
1236
1237static int __init alsa_pcm_init(void)
1238{
1239 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1240 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1241 snd_pcm_proc_init();
1242 return 0;
1243}
1244
1245static void __exit alsa_pcm_exit(void)
1246{
1247 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1248 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1249 snd_pcm_proc_done();
1250}
1251
1252module_init(alsa_pcm_init)
1253module_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 FORMAT(S20_LE),
215 FORMAT(S20_BE),
216 FORMAT(U20_LE),
217 FORMAT(U20_BE),
218};
219
220/**
221 * snd_pcm_format_name - Return a name string for the given PCM format
222 * @format: PCM format
223 *
224 * Return: the format name string
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 const char * const snd_pcm_stream_names[] = {
247 STREAM(PLAYBACK),
248 STREAM(CAPTURE),
249};
250
251static const char * const 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 STATE(DISCONNECTED),
261};
262
263static const char * const snd_pcm_access_names[] = {
264 ACCESS(MMAP_INTERLEAVED),
265 ACCESS(MMAP_NONINTERLEAVED),
266 ACCESS(MMAP_COMPLEX),
267 ACCESS(RW_INTERLEAVED),
268 ACCESS(RW_NONINTERLEAVED),
269};
270
271static const char * const snd_pcm_subformat_names[] = {
272 SUBFORMAT(STD),
273 SUBFORMAT(MSBITS_MAX),
274 SUBFORMAT(MSBITS_20),
275 SUBFORMAT(MSBITS_24),
276};
277
278static const char * const snd_pcm_tstamp_mode_names[] = {
279 TSTAMP(NONE),
280 TSTAMP(ENABLE),
281};
282
283static const char *snd_pcm_stream_name(int stream)
284{
285 return snd_pcm_stream_names[stream];
286}
287
288static const char *snd_pcm_access_name(snd_pcm_access_t access)
289{
290 return snd_pcm_access_names[(__force int)access];
291}
292
293static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
294{
295 return snd_pcm_subformat_names[(__force int)subformat];
296}
297
298static const char *snd_pcm_tstamp_mode_name(int mode)
299{
300 return snd_pcm_tstamp_mode_names[mode];
301}
302
303static const char *snd_pcm_state_name(snd_pcm_state_t state)
304{
305 return snd_pcm_state_names[(__force int)state];
306}
307
308#if IS_ENABLED(CONFIG_SND_PCM_OSS)
309#include <linux/soundcard.h>
310
311static const char *snd_pcm_oss_format_name(int format)
312{
313 switch (format) {
314 case AFMT_MU_LAW:
315 return "MU_LAW";
316 case AFMT_A_LAW:
317 return "A_LAW";
318 case AFMT_IMA_ADPCM:
319 return "IMA_ADPCM";
320 case AFMT_U8:
321 return "U8";
322 case AFMT_S16_LE:
323 return "S16_LE";
324 case AFMT_S16_BE:
325 return "S16_BE";
326 case AFMT_S8:
327 return "S8";
328 case AFMT_U16_LE:
329 return "U16_LE";
330 case AFMT_U16_BE:
331 return "U16_BE";
332 case AFMT_MPEG:
333 return "MPEG";
334 default:
335 return "unknown";
336 }
337}
338#endif
339
340static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
341 struct snd_info_buffer *buffer)
342{
343 struct snd_pcm_info *info;
344 int err;
345
346 if (! substream)
347 return;
348
349 info = kmalloc(sizeof(*info), GFP_KERNEL);
350 if (!info)
351 return;
352
353 err = snd_pcm_info(substream, info);
354 if (err < 0) {
355 snd_iprintf(buffer, "error %d\n", err);
356 kfree(info);
357 return;
358 }
359 snd_iprintf(buffer, "card: %d\n", info->card);
360 snd_iprintf(buffer, "device: %d\n", info->device);
361 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
362 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
363 snd_iprintf(buffer, "id: %s\n", info->id);
364 snd_iprintf(buffer, "name: %s\n", info->name);
365 snd_iprintf(buffer, "subname: %s\n", info->subname);
366 snd_iprintf(buffer, "class: %d\n", info->dev_class);
367 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
368 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
369 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
370 kfree(info);
371}
372
373static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
374 struct snd_info_buffer *buffer)
375{
376 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
377 buffer);
378}
379
380static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
381 struct snd_info_buffer *buffer)
382{
383 snd_pcm_proc_info_read(entry->private_data, buffer);
384}
385
386static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
387 struct snd_info_buffer *buffer)
388{
389 struct snd_pcm_substream *substream = entry->private_data;
390 struct snd_pcm_runtime *runtime;
391
392 mutex_lock(&substream->pcm->open_mutex);
393 runtime = substream->runtime;
394 if (!runtime) {
395 snd_iprintf(buffer, "closed\n");
396 goto unlock;
397 }
398 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
399 snd_iprintf(buffer, "no setup\n");
400 goto unlock;
401 }
402 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
403 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
404 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
405 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
406 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
407 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
408 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
409#if IS_ENABLED(CONFIG_SND_PCM_OSS)
410 if (substream->oss.oss) {
411 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
412 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
413 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
414 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
415 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
416 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
417 }
418#endif
419 unlock:
420 mutex_unlock(&substream->pcm->open_mutex);
421}
422
423static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
424 struct snd_info_buffer *buffer)
425{
426 struct snd_pcm_substream *substream = entry->private_data;
427 struct snd_pcm_runtime *runtime;
428
429 mutex_lock(&substream->pcm->open_mutex);
430 runtime = substream->runtime;
431 if (!runtime) {
432 snd_iprintf(buffer, "closed\n");
433 goto unlock;
434 }
435 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
436 snd_iprintf(buffer, "no setup\n");
437 goto unlock;
438 }
439 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
440 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
441 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
442 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
443 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
444 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
445 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
446 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
447 unlock:
448 mutex_unlock(&substream->pcm->open_mutex);
449}
450
451static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
452 struct snd_info_buffer *buffer)
453{
454 struct snd_pcm_substream *substream = entry->private_data;
455 struct snd_pcm_runtime *runtime;
456 struct snd_pcm_status64 status;
457 int err;
458
459 mutex_lock(&substream->pcm->open_mutex);
460 runtime = substream->runtime;
461 if (!runtime) {
462 snd_iprintf(buffer, "closed\n");
463 goto unlock;
464 }
465 memset(&status, 0, sizeof(status));
466 err = snd_pcm_status64(substream, &status);
467 if (err < 0) {
468 snd_iprintf(buffer, "error %d\n", err);
469 goto unlock;
470 }
471 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
472 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
473 snd_iprintf(buffer, "trigger_time: %lld.%09lld\n",
474 status.trigger_tstamp_sec, status.trigger_tstamp_nsec);
475 snd_iprintf(buffer, "tstamp : %lld.%09lld\n",
476 status.tstamp_sec, status.tstamp_nsec);
477 snd_iprintf(buffer, "delay : %ld\n", status.delay);
478 snd_iprintf(buffer, "avail : %ld\n", status.avail);
479 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
480 snd_iprintf(buffer, "-----\n");
481 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
482 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
483 unlock:
484 mutex_unlock(&substream->pcm->open_mutex);
485}
486
487#ifdef CONFIG_SND_PCM_XRUN_DEBUG
488static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
489 struct snd_info_buffer *buffer)
490{
491 struct snd_pcm_substream *substream = entry->private_data;
492
493 snd_pcm_stop_xrun(substream);
494}
495
496static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
497 struct snd_info_buffer *buffer)
498{
499 struct snd_pcm_str *pstr = entry->private_data;
500 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
501}
502
503static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
504 struct snd_info_buffer *buffer)
505{
506 struct snd_pcm_str *pstr = entry->private_data;
507 char line[64];
508 if (!snd_info_get_line(buffer, line, sizeof(line)))
509 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
510}
511#endif
512
513static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
514{
515 struct snd_pcm *pcm = pstr->pcm;
516 struct snd_info_entry *entry;
517 char name[16];
518
519 sprintf(name, "pcm%i%c", pcm->device,
520 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
521 entry = snd_info_create_card_entry(pcm->card, name,
522 pcm->card->proc_root);
523 if (!entry)
524 return -ENOMEM;
525 entry->mode = S_IFDIR | 0555;
526 pstr->proc_root = entry;
527 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
528 if (entry)
529 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
530#ifdef CONFIG_SND_PCM_XRUN_DEBUG
531 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
532 pstr->proc_root);
533 if (entry) {
534 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
535 entry->c.text.write = snd_pcm_xrun_debug_write;
536 entry->mode |= 0200;
537 }
538#endif
539 return 0;
540}
541
542static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
543{
544 snd_info_free_entry(pstr->proc_root);
545 pstr->proc_root = NULL;
546 return 0;
547}
548
549static struct snd_info_entry *
550create_substream_info_entry(struct snd_pcm_substream *substream,
551 const char *name,
552 void (*read)(struct snd_info_entry *,
553 struct snd_info_buffer *))
554{
555 struct snd_info_entry *entry;
556
557 entry = snd_info_create_card_entry(substream->pcm->card, name,
558 substream->proc_root);
559 if (entry)
560 snd_info_set_text_ops(entry, substream, read);
561 return entry;
562}
563
564static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
565{
566 struct snd_info_entry *entry;
567 struct snd_card *card;
568 char name[16];
569
570 card = substream->pcm->card;
571
572 sprintf(name, "sub%i", substream->number);
573 entry = snd_info_create_card_entry(card, name,
574 substream->pstr->proc_root);
575 if (!entry)
576 return -ENOMEM;
577 entry->mode = S_IFDIR | 0555;
578 substream->proc_root = entry;
579
580 create_substream_info_entry(substream, "info",
581 snd_pcm_substream_proc_info_read);
582 create_substream_info_entry(substream, "hw_params",
583 snd_pcm_substream_proc_hw_params_read);
584 create_substream_info_entry(substream, "sw_params",
585 snd_pcm_substream_proc_sw_params_read);
586 create_substream_info_entry(substream, "status",
587 snd_pcm_substream_proc_status_read);
588
589#ifdef CONFIG_SND_PCM_XRUN_DEBUG
590 entry = create_substream_info_entry(substream, "xrun_injection", NULL);
591 if (entry) {
592 entry->c.text.write = snd_pcm_xrun_injection_write;
593 entry->mode = S_IFREG | 0200;
594 }
595#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
596
597 return 0;
598}
599
600#else /* !CONFIG_SND_VERBOSE_PROCFS */
601static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
602static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
603static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
604#endif /* CONFIG_SND_VERBOSE_PROCFS */
605
606static const struct attribute_group *pcm_dev_attr_groups[];
607
608/*
609 * PM callbacks: we need to deal only with suspend here, as the resume is
610 * triggered either from user-space or the driver's resume callback
611 */
612#ifdef CONFIG_PM_SLEEP
613static int do_pcm_suspend(struct device *dev)
614{
615 struct snd_pcm_str *pstr = dev_get_drvdata(dev);
616
617 if (!pstr->pcm->no_device_suspend)
618 snd_pcm_suspend_all(pstr->pcm);
619 return 0;
620}
621#endif
622
623static const struct dev_pm_ops pcm_dev_pm_ops = {
624 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
625};
626
627/* device type for PCM -- basically only for passing PM callbacks */
628static const struct device_type pcm_dev_type = {
629 .name = "pcm",
630 .pm = &pcm_dev_pm_ops,
631};
632
633/**
634 * snd_pcm_new_stream - create a new PCM stream
635 * @pcm: the pcm instance
636 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
637 * @substream_count: the number of substreams
638 *
639 * Creates a new stream for the pcm.
640 * The corresponding stream on the pcm must have been empty before
641 * calling this, i.e. zero must be given to the argument of
642 * snd_pcm_new().
643 *
644 * Return: Zero if successful, or a negative error code on failure.
645 */
646int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
647{
648 int idx, err;
649 struct snd_pcm_str *pstr = &pcm->streams[stream];
650 struct snd_pcm_substream *substream, *prev;
651
652#if IS_ENABLED(CONFIG_SND_PCM_OSS)
653 mutex_init(&pstr->oss.setup_mutex);
654#endif
655 pstr->stream = stream;
656 pstr->pcm = pcm;
657 pstr->substream_count = substream_count;
658 if (!substream_count)
659 return 0;
660
661 err = snd_device_alloc(&pstr->dev, pcm->card);
662 if (err < 0)
663 return err;
664 dev_set_name(pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
665 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
666 pstr->dev->groups = pcm_dev_attr_groups;
667 pstr->dev->type = &pcm_dev_type;
668 dev_set_drvdata(pstr->dev, pstr);
669
670 if (!pcm->internal) {
671 err = snd_pcm_stream_proc_init(pstr);
672 if (err < 0) {
673 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
674 return err;
675 }
676 }
677 prev = NULL;
678 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
679 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
680 if (!substream)
681 return -ENOMEM;
682 substream->pcm = pcm;
683 substream->pstr = pstr;
684 substream->number = idx;
685 substream->stream = stream;
686 sprintf(substream->name, "subdevice #%i", idx);
687 substream->buffer_bytes_max = UINT_MAX;
688 if (prev == NULL)
689 pstr->substream = substream;
690 else
691 prev->next = substream;
692
693 if (!pcm->internal) {
694 err = snd_pcm_substream_proc_init(substream);
695 if (err < 0) {
696 pcm_err(pcm,
697 "Error in snd_pcm_stream_proc_init\n");
698 if (prev == NULL)
699 pstr->substream = NULL;
700 else
701 prev->next = NULL;
702 kfree(substream);
703 return err;
704 }
705 }
706 substream->group = &substream->self_group;
707 snd_pcm_group_init(&substream->self_group);
708 list_add_tail(&substream->link_list, &substream->self_group.substreams);
709 atomic_set(&substream->mmap_count, 0);
710 prev = substream;
711 }
712 return 0;
713}
714EXPORT_SYMBOL(snd_pcm_new_stream);
715
716static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
717 int playback_count, int capture_count, bool internal,
718 struct snd_pcm **rpcm)
719{
720 struct snd_pcm *pcm;
721 int err;
722 static const struct snd_device_ops ops = {
723 .dev_free = snd_pcm_dev_free,
724 .dev_register = snd_pcm_dev_register,
725 .dev_disconnect = snd_pcm_dev_disconnect,
726 };
727 static const struct snd_device_ops internal_ops = {
728 .dev_free = snd_pcm_dev_free,
729 };
730
731 if (snd_BUG_ON(!card))
732 return -ENXIO;
733 if (rpcm)
734 *rpcm = NULL;
735 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
736 if (!pcm)
737 return -ENOMEM;
738 pcm->card = card;
739 pcm->device = device;
740 pcm->internal = internal;
741 mutex_init(&pcm->open_mutex);
742 init_waitqueue_head(&pcm->open_wait);
743 INIT_LIST_HEAD(&pcm->list);
744 if (id)
745 strscpy(pcm->id, id, sizeof(pcm->id));
746
747 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
748 playback_count);
749 if (err < 0)
750 goto free_pcm;
751
752 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
753 if (err < 0)
754 goto free_pcm;
755
756 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
757 internal ? &internal_ops : &ops);
758 if (err < 0)
759 goto free_pcm;
760
761 if (rpcm)
762 *rpcm = pcm;
763 return 0;
764
765free_pcm:
766 snd_pcm_free(pcm);
767 return err;
768}
769
770/**
771 * snd_pcm_new - create a new PCM instance
772 * @card: the card instance
773 * @id: the id string
774 * @device: the device index (zero based)
775 * @playback_count: the number of substreams for playback
776 * @capture_count: the number of substreams for capture
777 * @rpcm: the pointer to store the new pcm instance
778 *
779 * Creates a new PCM instance.
780 *
781 * The pcm operators have to be set afterwards to the new instance
782 * via snd_pcm_set_ops().
783 *
784 * Return: Zero if successful, or a negative error code on failure.
785 */
786int snd_pcm_new(struct snd_card *card, const char *id, int device,
787 int playback_count, int capture_count, struct snd_pcm **rpcm)
788{
789 return _snd_pcm_new(card, id, device, playback_count, capture_count,
790 false, rpcm);
791}
792EXPORT_SYMBOL(snd_pcm_new);
793
794/**
795 * snd_pcm_new_internal - create a new internal PCM instance
796 * @card: the card instance
797 * @id: the id string
798 * @device: the device index (zero based - shared with normal PCMs)
799 * @playback_count: the number of substreams for playback
800 * @capture_count: the number of substreams for capture
801 * @rpcm: the pointer to store the new pcm instance
802 *
803 * Creates a new internal PCM instance with no userspace device or procfs
804 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
805 * will only be used internally by kernel drivers. i.e. it cannot be opened
806 * by userspace. It provides existing ASoC components drivers with a substream
807 * and access to any private data.
808 *
809 * The pcm operators have to be set afterwards to the new instance
810 * via snd_pcm_set_ops().
811 *
812 * Return: Zero if successful, or a negative error code on failure.
813 */
814int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
815 int playback_count, int capture_count,
816 struct snd_pcm **rpcm)
817{
818 return _snd_pcm_new(card, id, device, playback_count, capture_count,
819 true, rpcm);
820}
821EXPORT_SYMBOL(snd_pcm_new_internal);
822
823static void free_chmap(struct snd_pcm_str *pstr)
824{
825 if (pstr->chmap_kctl) {
826 struct snd_card *card = pstr->pcm->card;
827
828 snd_ctl_remove(card, pstr->chmap_kctl);
829 pstr->chmap_kctl = NULL;
830 }
831}
832
833static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
834{
835 struct snd_pcm_substream *substream, *substream_next;
836#if IS_ENABLED(CONFIG_SND_PCM_OSS)
837 struct snd_pcm_oss_setup *setup, *setupn;
838#endif
839
840 /* free all proc files under the stream */
841 snd_pcm_stream_proc_done(pstr);
842
843 substream = pstr->substream;
844 while (substream) {
845 substream_next = substream->next;
846 snd_pcm_timer_done(substream);
847 kfree(substream);
848 substream = substream_next;
849 }
850#if IS_ENABLED(CONFIG_SND_PCM_OSS)
851 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
852 setupn = setup->next;
853 kfree(setup->task_name);
854 kfree(setup);
855 }
856#endif
857 free_chmap(pstr);
858 if (pstr->substream_count)
859 put_device(pstr->dev);
860}
861
862#if IS_ENABLED(CONFIG_SND_PCM_OSS)
863#define pcm_call_notify(pcm, call) \
864 do { \
865 struct snd_pcm_notify *_notify; \
866 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
867 _notify->call(pcm); \
868 } while (0)
869#else
870#define pcm_call_notify(pcm, call) do {} while (0)
871#endif
872
873static int snd_pcm_free(struct snd_pcm *pcm)
874{
875 if (!pcm)
876 return 0;
877 if (!pcm->internal)
878 pcm_call_notify(pcm, n_unregister);
879 if (pcm->private_free)
880 pcm->private_free(pcm);
881 snd_pcm_lib_preallocate_free_for_all(pcm);
882 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
883 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
884 kfree(pcm);
885 return 0;
886}
887
888static int snd_pcm_dev_free(struct snd_device *device)
889{
890 struct snd_pcm *pcm = device->device_data;
891 return snd_pcm_free(pcm);
892}
893
894int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
895 struct file *file,
896 struct snd_pcm_substream **rsubstream)
897{
898 struct snd_pcm_str * pstr;
899 struct snd_pcm_substream *substream;
900 struct snd_pcm_runtime *runtime;
901 struct snd_card *card;
902 int prefer_subdevice;
903 size_t size;
904
905 if (snd_BUG_ON(!pcm || !rsubstream))
906 return -ENXIO;
907 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
908 stream != SNDRV_PCM_STREAM_CAPTURE))
909 return -EINVAL;
910 *rsubstream = NULL;
911 pstr = &pcm->streams[stream];
912 if (pstr->substream == NULL || pstr->substream_count == 0)
913 return -ENODEV;
914
915 card = pcm->card;
916 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
917
918 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
919 int opposite = !stream;
920
921 for (substream = pcm->streams[opposite].substream; substream;
922 substream = substream->next) {
923 if (SUBSTREAM_BUSY(substream))
924 return -EAGAIN;
925 }
926 }
927
928 if (file->f_flags & O_APPEND) {
929 if (prefer_subdevice < 0) {
930 if (pstr->substream_count > 1)
931 return -EINVAL; /* must be unique */
932 substream = pstr->substream;
933 } else {
934 for (substream = pstr->substream; substream;
935 substream = substream->next)
936 if (substream->number == prefer_subdevice)
937 break;
938 }
939 if (! substream)
940 return -ENODEV;
941 if (! SUBSTREAM_BUSY(substream))
942 return -EBADFD;
943 substream->ref_count++;
944 *rsubstream = substream;
945 return 0;
946 }
947
948 for (substream = pstr->substream; substream; substream = substream->next) {
949 if (!SUBSTREAM_BUSY(substream) &&
950 (prefer_subdevice == -1 ||
951 substream->number == prefer_subdevice))
952 break;
953 }
954 if (substream == NULL)
955 return -EAGAIN;
956
957 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
958 if (runtime == NULL)
959 return -ENOMEM;
960
961 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
962 runtime->status = alloc_pages_exact(size, GFP_KERNEL);
963 if (runtime->status == NULL) {
964 kfree(runtime);
965 return -ENOMEM;
966 }
967 memset(runtime->status, 0, size);
968
969 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
970 runtime->control = alloc_pages_exact(size, GFP_KERNEL);
971 if (runtime->control == NULL) {
972 free_pages_exact(runtime->status,
973 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
974 kfree(runtime);
975 return -ENOMEM;
976 }
977 memset(runtime->control, 0, size);
978
979 init_waitqueue_head(&runtime->sleep);
980 init_waitqueue_head(&runtime->tsleep);
981
982 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_OPEN);
983 mutex_init(&runtime->buffer_mutex);
984 atomic_set(&runtime->buffer_accessing, 0);
985
986 substream->runtime = runtime;
987 substream->private_data = pcm->private_data;
988 substream->ref_count = 1;
989 substream->f_flags = file->f_flags;
990 substream->pid = get_pid(task_pid(current));
991 pstr->substream_opened++;
992 *rsubstream = substream;
993 return 0;
994}
995
996void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
997{
998 struct snd_pcm_runtime *runtime;
999
1000 if (PCM_RUNTIME_CHECK(substream))
1001 return;
1002 runtime = substream->runtime;
1003 if (runtime->private_free != NULL)
1004 runtime->private_free(runtime);
1005 free_pages_exact(runtime->status,
1006 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1007 free_pages_exact(runtime->control,
1008 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1009 kfree(runtime->hw_constraints.rules);
1010 /* Avoid concurrent access to runtime via PCM timer interface */
1011 if (substream->timer) {
1012 spin_lock_irq(&substream->timer->lock);
1013 substream->runtime = NULL;
1014 spin_unlock_irq(&substream->timer->lock);
1015 } else {
1016 substream->runtime = NULL;
1017 }
1018 mutex_destroy(&runtime->buffer_mutex);
1019 snd_fasync_free(runtime->fasync);
1020 kfree(runtime);
1021 put_pid(substream->pid);
1022 substream->pid = NULL;
1023 substream->pstr->substream_opened--;
1024}
1025
1026static ssize_t pcm_class_show(struct device *dev,
1027 struct device_attribute *attr, char *buf)
1028{
1029 struct snd_pcm_str *pstr = dev_get_drvdata(dev);
1030 struct snd_pcm *pcm = pstr->pcm;
1031 const char *str;
1032 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1033 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1034 [SNDRV_PCM_CLASS_MULTI] = "multi",
1035 [SNDRV_PCM_CLASS_MODEM] = "modem",
1036 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1037 };
1038
1039 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1040 str = "none";
1041 else
1042 str = strs[pcm->dev_class];
1043 return sysfs_emit(buf, "%s\n", str);
1044}
1045
1046static DEVICE_ATTR_RO(pcm_class);
1047static struct attribute *pcm_dev_attrs[] = {
1048 &dev_attr_pcm_class.attr,
1049 NULL
1050};
1051
1052static const struct attribute_group pcm_dev_attr_group = {
1053 .attrs = pcm_dev_attrs,
1054};
1055
1056static const struct attribute_group *pcm_dev_attr_groups[] = {
1057 &pcm_dev_attr_group,
1058 NULL
1059};
1060
1061static int snd_pcm_dev_register(struct snd_device *device)
1062{
1063 int cidx, err;
1064 struct snd_pcm_substream *substream;
1065 struct snd_pcm *pcm;
1066
1067 if (snd_BUG_ON(!device || !device->device_data))
1068 return -ENXIO;
1069 pcm = device->device_data;
1070
1071 mutex_lock(®ister_mutex);
1072 err = snd_pcm_add(pcm);
1073 if (err)
1074 goto unlock;
1075 for (cidx = 0; cidx < 2; cidx++) {
1076 int devtype = -1;
1077 if (pcm->streams[cidx].substream == NULL)
1078 continue;
1079 switch (cidx) {
1080 case SNDRV_PCM_STREAM_PLAYBACK:
1081 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1082 break;
1083 case SNDRV_PCM_STREAM_CAPTURE:
1084 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1085 break;
1086 }
1087 /* register pcm */
1088 err = snd_register_device(devtype, pcm->card, pcm->device,
1089 &snd_pcm_f_ops[cidx], pcm,
1090 pcm->streams[cidx].dev);
1091 if (err < 0) {
1092 list_del_init(&pcm->list);
1093 goto unlock;
1094 }
1095
1096 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1097 snd_pcm_timer_init(substream);
1098 }
1099
1100 pcm_call_notify(pcm, n_register);
1101
1102 unlock:
1103 mutex_unlock(®ister_mutex);
1104 return err;
1105}
1106
1107static int snd_pcm_dev_disconnect(struct snd_device *device)
1108{
1109 struct snd_pcm *pcm = device->device_data;
1110 struct snd_pcm_substream *substream;
1111 int cidx;
1112
1113 mutex_lock(®ister_mutex);
1114 mutex_lock(&pcm->open_mutex);
1115 wake_up(&pcm->open_wait);
1116 list_del_init(&pcm->list);
1117
1118 for_each_pcm_substream(pcm, cidx, substream) {
1119 snd_pcm_stream_lock_irq(substream);
1120 if (substream->runtime) {
1121 if (snd_pcm_running(substream))
1122 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
1123 /* to be sure, set the state unconditionally */
1124 __snd_pcm_set_state(substream->runtime,
1125 SNDRV_PCM_STATE_DISCONNECTED);
1126 wake_up(&substream->runtime->sleep);
1127 wake_up(&substream->runtime->tsleep);
1128 }
1129 snd_pcm_stream_unlock_irq(substream);
1130 }
1131
1132 for_each_pcm_substream(pcm, cidx, substream)
1133 snd_pcm_sync_stop(substream, false);
1134
1135 pcm_call_notify(pcm, n_disconnect);
1136 for (cidx = 0; cidx < 2; cidx++) {
1137 if (pcm->streams[cidx].dev)
1138 snd_unregister_device(pcm->streams[cidx].dev);
1139 free_chmap(&pcm->streams[cidx]);
1140 }
1141 mutex_unlock(&pcm->open_mutex);
1142 mutex_unlock(®ister_mutex);
1143 return 0;
1144}
1145
1146#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1147/**
1148 * snd_pcm_notify - Add/remove the notify list
1149 * @notify: PCM notify list
1150 * @nfree: 0 = register, 1 = unregister
1151 *
1152 * This adds the given notifier to the global list so that the callback is
1153 * called for each registered PCM devices. This exists only for PCM OSS
1154 * emulation, so far.
1155 *
1156 * Return: zero if successful, or a negative error code
1157 */
1158int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1159{
1160 struct snd_pcm *pcm;
1161
1162 if (snd_BUG_ON(!notify ||
1163 !notify->n_register ||
1164 !notify->n_unregister ||
1165 !notify->n_disconnect))
1166 return -EINVAL;
1167 mutex_lock(®ister_mutex);
1168 if (nfree) {
1169 list_del(¬ify->list);
1170 list_for_each_entry(pcm, &snd_pcm_devices, list)
1171 notify->n_unregister(pcm);
1172 } else {
1173 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1174 list_for_each_entry(pcm, &snd_pcm_devices, list)
1175 notify->n_register(pcm);
1176 }
1177 mutex_unlock(®ister_mutex);
1178 return 0;
1179}
1180EXPORT_SYMBOL(snd_pcm_notify);
1181#endif /* CONFIG_SND_PCM_OSS */
1182
1183#ifdef CONFIG_SND_PROC_FS
1184/*
1185 * Info interface
1186 */
1187
1188static void snd_pcm_proc_read(struct snd_info_entry *entry,
1189 struct snd_info_buffer *buffer)
1190{
1191 struct snd_pcm *pcm;
1192
1193 mutex_lock(®ister_mutex);
1194 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1195 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1196 pcm->card->number, pcm->device, pcm->id, pcm->name);
1197 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1198 snd_iprintf(buffer, " : playback %i",
1199 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1200 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1201 snd_iprintf(buffer, " : capture %i",
1202 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1203 snd_iprintf(buffer, "\n");
1204 }
1205 mutex_unlock(®ister_mutex);
1206}
1207
1208static struct snd_info_entry *snd_pcm_proc_entry;
1209
1210static void snd_pcm_proc_init(void)
1211{
1212 struct snd_info_entry *entry;
1213
1214 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1215 if (entry) {
1216 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1217 if (snd_info_register(entry) < 0) {
1218 snd_info_free_entry(entry);
1219 entry = NULL;
1220 }
1221 }
1222 snd_pcm_proc_entry = entry;
1223}
1224
1225static void snd_pcm_proc_done(void)
1226{
1227 snd_info_free_entry(snd_pcm_proc_entry);
1228}
1229
1230#else /* !CONFIG_SND_PROC_FS */
1231#define snd_pcm_proc_init()
1232#define snd_pcm_proc_done()
1233#endif /* CONFIG_SND_PROC_FS */
1234
1235
1236/*
1237 * ENTRY functions
1238 */
1239
1240static int __init alsa_pcm_init(void)
1241{
1242 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1243 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1244 snd_pcm_proc_init();
1245 return 0;
1246}
1247
1248static void __exit alsa_pcm_exit(void)
1249{
1250 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1251 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1252 snd_pcm_proc_done();
1253}
1254
1255module_init(alsa_pcm_init)
1256module_exit(alsa_pcm_exit)