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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->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/*
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/timer.h>
32#include <sound/control.h>
33#include <sound/info.h>
34
35#include "pcm_local.h"
36
37MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
38MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
39MODULE_LICENSE("GPL");
40
41static LIST_HEAD(snd_pcm_devices);
42static DEFINE_MUTEX(register_mutex);
43#if IS_ENABLED(CONFIG_SND_PCM_OSS)
44static LIST_HEAD(snd_pcm_notify_list);
45#endif
46
47static int snd_pcm_free(struct snd_pcm *pcm);
48static int snd_pcm_dev_free(struct snd_device *device);
49static int snd_pcm_dev_register(struct snd_device *device);
50static int snd_pcm_dev_disconnect(struct snd_device *device);
51
52static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
53{
54 struct snd_pcm *pcm;
55
56 list_for_each_entry(pcm, &snd_pcm_devices, list) {
57 if (pcm->card == card && pcm->device == device)
58 return pcm;
59 }
60 return NULL;
61}
62
63static int snd_pcm_next(struct snd_card *card, int device)
64{
65 struct snd_pcm *pcm;
66
67 list_for_each_entry(pcm, &snd_pcm_devices, list) {
68 if (pcm->card == card && pcm->device > device)
69 return pcm->device;
70 else if (pcm->card->number > card->number)
71 return -1;
72 }
73 return -1;
74}
75
76static int snd_pcm_add(struct snd_pcm *newpcm)
77{
78 struct snd_pcm *pcm;
79
80 if (newpcm->internal)
81 return 0;
82
83 list_for_each_entry(pcm, &snd_pcm_devices, list) {
84 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
85 return -EBUSY;
86 if (pcm->card->number > newpcm->card->number ||
87 (pcm->card == newpcm->card &&
88 pcm->device > newpcm->device)) {
89 list_add(&newpcm->list, pcm->list.prev);
90 return 0;
91 }
92 }
93 list_add_tail(&newpcm->list, &snd_pcm_devices);
94 return 0;
95}
96
97static int snd_pcm_control_ioctl(struct snd_card *card,
98 struct snd_ctl_file *control,
99 unsigned int cmd, unsigned long arg)
100{
101 switch (cmd) {
102 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
103 {
104 int device;
105
106 if (get_user(device, (int __user *)arg))
107 return -EFAULT;
108 mutex_lock(®ister_mutex);
109 device = snd_pcm_next(card, device);
110 mutex_unlock(®ister_mutex);
111 if (put_user(device, (int __user *)arg))
112 return -EFAULT;
113 return 0;
114 }
115 case SNDRV_CTL_IOCTL_PCM_INFO:
116 {
117 struct snd_pcm_info __user *info;
118 unsigned int device, subdevice;
119 int stream;
120 struct snd_pcm *pcm;
121 struct snd_pcm_str *pstr;
122 struct snd_pcm_substream *substream;
123 int err;
124
125 info = (struct snd_pcm_info __user *)arg;
126 if (get_user(device, &info->device))
127 return -EFAULT;
128 if (get_user(stream, &info->stream))
129 return -EFAULT;
130 if (stream < 0 || stream > 1)
131 return -EINVAL;
132 if (get_user(subdevice, &info->subdevice))
133 return -EFAULT;
134 mutex_lock(®ister_mutex);
135 pcm = snd_pcm_get(card, device);
136 if (pcm == NULL) {
137 err = -ENXIO;
138 goto _error;
139 }
140 pstr = &pcm->streams[stream];
141 if (pstr->substream_count == 0) {
142 err = -ENOENT;
143 goto _error;
144 }
145 if (subdevice >= pstr->substream_count) {
146 err = -ENXIO;
147 goto _error;
148 }
149 for (substream = pstr->substream; substream;
150 substream = substream->next)
151 if (substream->number == (int)subdevice)
152 break;
153 if (substream == NULL) {
154 err = -ENXIO;
155 goto _error;
156 }
157 mutex_lock(&pcm->open_mutex);
158 err = snd_pcm_info_user(substream, info);
159 mutex_unlock(&pcm->open_mutex);
160 _error:
161 mutex_unlock(®ister_mutex);
162 return err;
163 }
164 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
165 {
166 int val;
167
168 if (get_user(val, (int __user *)arg))
169 return -EFAULT;
170 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
171 return 0;
172 }
173 }
174 return -ENOIOCTLCMD;
175}
176
177#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
178
179static char *snd_pcm_format_names[] = {
180 FORMAT(S8),
181 FORMAT(U8),
182 FORMAT(S16_LE),
183 FORMAT(S16_BE),
184 FORMAT(U16_LE),
185 FORMAT(U16_BE),
186 FORMAT(S24_LE),
187 FORMAT(S24_BE),
188 FORMAT(U24_LE),
189 FORMAT(U24_BE),
190 FORMAT(S32_LE),
191 FORMAT(S32_BE),
192 FORMAT(U32_LE),
193 FORMAT(U32_BE),
194 FORMAT(FLOAT_LE),
195 FORMAT(FLOAT_BE),
196 FORMAT(FLOAT64_LE),
197 FORMAT(FLOAT64_BE),
198 FORMAT(IEC958_SUBFRAME_LE),
199 FORMAT(IEC958_SUBFRAME_BE),
200 FORMAT(MU_LAW),
201 FORMAT(A_LAW),
202 FORMAT(IMA_ADPCM),
203 FORMAT(MPEG),
204 FORMAT(GSM),
205 FORMAT(SPECIAL),
206 FORMAT(S24_3LE),
207 FORMAT(S24_3BE),
208 FORMAT(U24_3LE),
209 FORMAT(U24_3BE),
210 FORMAT(S20_3LE),
211 FORMAT(S20_3BE),
212 FORMAT(U20_3LE),
213 FORMAT(U20_3BE),
214 FORMAT(S18_3LE),
215 FORMAT(S18_3BE),
216 FORMAT(U18_3LE),
217 FORMAT(U18_3BE),
218 FORMAT(G723_24),
219 FORMAT(G723_24_1B),
220 FORMAT(G723_40),
221 FORMAT(G723_40_1B),
222 FORMAT(DSD_U8),
223 FORMAT(DSD_U16_LE),
224 FORMAT(DSD_U32_LE),
225 FORMAT(DSD_U16_BE),
226 FORMAT(DSD_U32_BE),
227};
228
229/**
230 * snd_pcm_format_name - Return a name string for the given PCM format
231 * @format: PCM format
232 */
233const char *snd_pcm_format_name(snd_pcm_format_t format)
234{
235 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
236 return "Unknown";
237 return snd_pcm_format_names[(__force unsigned int)format];
238}
239EXPORT_SYMBOL_GPL(snd_pcm_format_name);
240
241#ifdef CONFIG_SND_VERBOSE_PROCFS
242
243#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
244#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
245#define READY(v) [SNDRV_PCM_READY_##v] = #v
246#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
247#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
248#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
249#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
250#define START(v) [SNDRV_PCM_START_##v] = #v
251#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
252
253static char *snd_pcm_stream_names[] = {
254 STREAM(PLAYBACK),
255 STREAM(CAPTURE),
256};
257
258static char *snd_pcm_state_names[] = {
259 STATE(OPEN),
260 STATE(SETUP),
261 STATE(PREPARED),
262 STATE(RUNNING),
263 STATE(XRUN),
264 STATE(DRAINING),
265 STATE(PAUSED),
266 STATE(SUSPENDED),
267};
268
269static char *snd_pcm_access_names[] = {
270 ACCESS(MMAP_INTERLEAVED),
271 ACCESS(MMAP_NONINTERLEAVED),
272 ACCESS(MMAP_COMPLEX),
273 ACCESS(RW_INTERLEAVED),
274 ACCESS(RW_NONINTERLEAVED),
275};
276
277static char *snd_pcm_subformat_names[] = {
278 SUBFORMAT(STD),
279};
280
281static char *snd_pcm_tstamp_mode_names[] = {
282 TSTAMP(NONE),
283 TSTAMP(ENABLE),
284};
285
286static const char *snd_pcm_stream_name(int stream)
287{
288 return snd_pcm_stream_names[stream];
289}
290
291static const char *snd_pcm_access_name(snd_pcm_access_t access)
292{
293 return snd_pcm_access_names[(__force int)access];
294}
295
296static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
297{
298 return snd_pcm_subformat_names[(__force int)subformat];
299}
300
301static const char *snd_pcm_tstamp_mode_name(int mode)
302{
303 return snd_pcm_tstamp_mode_names[mode];
304}
305
306static const char *snd_pcm_state_name(snd_pcm_state_t state)
307{
308 return snd_pcm_state_names[(__force int)state];
309}
310
311#if IS_ENABLED(CONFIG_SND_PCM_OSS)
312#include <linux/soundcard.h>
313
314static const char *snd_pcm_oss_format_name(int format)
315{
316 switch (format) {
317 case AFMT_MU_LAW:
318 return "MU_LAW";
319 case AFMT_A_LAW:
320 return "A_LAW";
321 case AFMT_IMA_ADPCM:
322 return "IMA_ADPCM";
323 case AFMT_U8:
324 return "U8";
325 case AFMT_S16_LE:
326 return "S16_LE";
327 case AFMT_S16_BE:
328 return "S16_BE";
329 case AFMT_S8:
330 return "S8";
331 case AFMT_U16_LE:
332 return "U16_LE";
333 case AFMT_U16_BE:
334 return "U16_BE";
335 case AFMT_MPEG:
336 return "MPEG";
337 default:
338 return "unknown";
339 }
340}
341#endif
342
343static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
344 struct snd_info_buffer *buffer)
345{
346 struct snd_pcm_info *info;
347 int err;
348
349 if (! substream)
350 return;
351
352 info = kmalloc(sizeof(*info), GFP_KERNEL);
353 if (!info)
354 return;
355
356 err = snd_pcm_info(substream, info);
357 if (err < 0) {
358 snd_iprintf(buffer, "error %d\n", err);
359 kfree(info);
360 return;
361 }
362 snd_iprintf(buffer, "card: %d\n", info->card);
363 snd_iprintf(buffer, "device: %d\n", info->device);
364 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
365 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
366 snd_iprintf(buffer, "id: %s\n", info->id);
367 snd_iprintf(buffer, "name: %s\n", info->name);
368 snd_iprintf(buffer, "subname: %s\n", info->subname);
369 snd_iprintf(buffer, "class: %d\n", info->dev_class);
370 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
371 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
372 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
373 kfree(info);
374}
375
376static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
378{
379 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
380 buffer);
381}
382
383static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
384 struct snd_info_buffer *buffer)
385{
386 snd_pcm_proc_info_read(entry->private_data, buffer);
387}
388
389static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
390 struct snd_info_buffer *buffer)
391{
392 struct snd_pcm_substream *substream = entry->private_data;
393 struct snd_pcm_runtime *runtime;
394
395 mutex_lock(&substream->pcm->open_mutex);
396 runtime = substream->runtime;
397 if (!runtime) {
398 snd_iprintf(buffer, "closed\n");
399 goto unlock;
400 }
401 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
402 snd_iprintf(buffer, "no setup\n");
403 goto unlock;
404 }
405 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
406 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
407 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
408 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
409 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
410 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
411 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
412#if IS_ENABLED(CONFIG_SND_PCM_OSS)
413 if (substream->oss.oss) {
414 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
415 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
416 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
417 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
418 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
419 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
420 }
421#endif
422 unlock:
423 mutex_unlock(&substream->pcm->open_mutex);
424}
425
426static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
427 struct snd_info_buffer *buffer)
428{
429 struct snd_pcm_substream *substream = entry->private_data;
430 struct snd_pcm_runtime *runtime;
431
432 mutex_lock(&substream->pcm->open_mutex);
433 runtime = substream->runtime;
434 if (!runtime) {
435 snd_iprintf(buffer, "closed\n");
436 goto unlock;
437 }
438 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
439 snd_iprintf(buffer, "no setup\n");
440 goto unlock;
441 }
442 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
443 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
444 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
445 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
446 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
447 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
448 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
449 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
450 unlock:
451 mutex_unlock(&substream->pcm->open_mutex);
452}
453
454static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
455 struct snd_info_buffer *buffer)
456{
457 struct snd_pcm_substream *substream = entry->private_data;
458 struct snd_pcm_runtime *runtime;
459 struct snd_pcm_status status;
460 int err;
461
462 mutex_lock(&substream->pcm->open_mutex);
463 runtime = substream->runtime;
464 if (!runtime) {
465 snd_iprintf(buffer, "closed\n");
466 goto unlock;
467 }
468 memset(&status, 0, sizeof(status));
469 err = snd_pcm_status(substream, &status);
470 if (err < 0) {
471 snd_iprintf(buffer, "error %d\n", err);
472 goto unlock;
473 }
474 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
475 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
476 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
477 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
478 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
479 status.tstamp.tv_sec, status.tstamp.tv_nsec);
480 snd_iprintf(buffer, "delay : %ld\n", status.delay);
481 snd_iprintf(buffer, "avail : %ld\n", status.avail);
482 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
483 snd_iprintf(buffer, "-----\n");
484 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
485 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
486 unlock:
487 mutex_unlock(&substream->pcm->open_mutex);
488}
489
490#ifdef CONFIG_SND_PCM_XRUN_DEBUG
491static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
492 struct snd_info_buffer *buffer)
493{
494 struct snd_pcm_substream *substream = entry->private_data;
495 struct snd_pcm_runtime *runtime;
496
497 snd_pcm_stream_lock_irq(substream);
498 runtime = substream->runtime;
499 if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
500 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
501 snd_pcm_stream_unlock_irq(substream);
502}
503
504static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
505 struct snd_info_buffer *buffer)
506{
507 struct snd_pcm_str *pstr = entry->private_data;
508 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
509}
510
511static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
512 struct snd_info_buffer *buffer)
513{
514 struct snd_pcm_str *pstr = entry->private_data;
515 char line[64];
516 if (!snd_info_get_line(buffer, line, sizeof(line)))
517 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
518}
519#endif
520
521static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
522{
523 struct snd_pcm *pcm = pstr->pcm;
524 struct snd_info_entry *entry;
525 char name[16];
526
527 sprintf(name, "pcm%i%c", pcm->device,
528 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
529 entry = snd_info_create_card_entry(pcm->card, name,
530 pcm->card->proc_root);
531 if (!entry)
532 return -ENOMEM;
533 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
534 if (snd_info_register(entry) < 0) {
535 snd_info_free_entry(entry);
536 return -ENOMEM;
537 }
538 pstr->proc_root = entry;
539 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
540 if (entry) {
541 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
542 if (snd_info_register(entry) < 0) {
543 snd_info_free_entry(entry);
544 entry = NULL;
545 }
546 }
547 pstr->proc_info_entry = entry;
548
549#ifdef CONFIG_SND_PCM_XRUN_DEBUG
550 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
551 pstr->proc_root);
552 if (entry) {
553 entry->c.text.read = snd_pcm_xrun_debug_read;
554 entry->c.text.write = snd_pcm_xrun_debug_write;
555 entry->mode |= S_IWUSR;
556 entry->private_data = pstr;
557 if (snd_info_register(entry) < 0) {
558 snd_info_free_entry(entry);
559 entry = NULL;
560 }
561 }
562 pstr->proc_xrun_debug_entry = entry;
563#endif
564 return 0;
565}
566
567static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
568{
569#ifdef CONFIG_SND_PCM_XRUN_DEBUG
570 snd_info_free_entry(pstr->proc_xrun_debug_entry);
571 pstr->proc_xrun_debug_entry = NULL;
572#endif
573 snd_info_free_entry(pstr->proc_info_entry);
574 pstr->proc_info_entry = NULL;
575 snd_info_free_entry(pstr->proc_root);
576 pstr->proc_root = NULL;
577 return 0;
578}
579
580static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
581{
582 struct snd_info_entry *entry;
583 struct snd_card *card;
584 char name[16];
585
586 card = substream->pcm->card;
587
588 sprintf(name, "sub%i", substream->number);
589 entry = snd_info_create_card_entry(card, name,
590 substream->pstr->proc_root);
591 if (!entry)
592 return -ENOMEM;
593 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
594 if (snd_info_register(entry) < 0) {
595 snd_info_free_entry(entry);
596 return -ENOMEM;
597 }
598 substream->proc_root = entry;
599 entry = snd_info_create_card_entry(card, "info", substream->proc_root);
600 if (entry) {
601 snd_info_set_text_ops(entry, substream,
602 snd_pcm_substream_proc_info_read);
603 if (snd_info_register(entry) < 0) {
604 snd_info_free_entry(entry);
605 entry = NULL;
606 }
607 }
608 substream->proc_info_entry = entry;
609 entry = snd_info_create_card_entry(card, "hw_params",
610 substream->proc_root);
611 if (entry) {
612 snd_info_set_text_ops(entry, substream,
613 snd_pcm_substream_proc_hw_params_read);
614 if (snd_info_register(entry) < 0) {
615 snd_info_free_entry(entry);
616 entry = NULL;
617 }
618 }
619 substream->proc_hw_params_entry = entry;
620 entry = snd_info_create_card_entry(card, "sw_params",
621 substream->proc_root);
622 if (entry) {
623 snd_info_set_text_ops(entry, substream,
624 snd_pcm_substream_proc_sw_params_read);
625 if (snd_info_register(entry) < 0) {
626 snd_info_free_entry(entry);
627 entry = NULL;
628 }
629 }
630 substream->proc_sw_params_entry = entry;
631 entry = snd_info_create_card_entry(card, "status",
632 substream->proc_root);
633 if (entry) {
634 snd_info_set_text_ops(entry, substream,
635 snd_pcm_substream_proc_status_read);
636 if (snd_info_register(entry) < 0) {
637 snd_info_free_entry(entry);
638 entry = NULL;
639 }
640 }
641 substream->proc_status_entry = entry;
642
643#ifdef CONFIG_SND_PCM_XRUN_DEBUG
644 entry = snd_info_create_card_entry(card, "xrun_injection",
645 substream->proc_root);
646 if (entry) {
647 entry->private_data = substream;
648 entry->c.text.read = NULL;
649 entry->c.text.write = snd_pcm_xrun_injection_write;
650 entry->mode = S_IFREG | S_IWUSR;
651 if (snd_info_register(entry) < 0) {
652 snd_info_free_entry(entry);
653 entry = NULL;
654 }
655 }
656 substream->proc_xrun_injection_entry = entry;
657#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
658
659 return 0;
660}
661
662static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
663{
664 snd_info_free_entry(substream->proc_info_entry);
665 substream->proc_info_entry = NULL;
666 snd_info_free_entry(substream->proc_hw_params_entry);
667 substream->proc_hw_params_entry = NULL;
668 snd_info_free_entry(substream->proc_sw_params_entry);
669 substream->proc_sw_params_entry = NULL;
670 snd_info_free_entry(substream->proc_status_entry);
671 substream->proc_status_entry = NULL;
672#ifdef CONFIG_SND_PCM_XRUN_DEBUG
673 snd_info_free_entry(substream->proc_xrun_injection_entry);
674 substream->proc_xrun_injection_entry = NULL;
675#endif
676 snd_info_free_entry(substream->proc_root);
677 substream->proc_root = NULL;
678 return 0;
679}
680#else /* !CONFIG_SND_VERBOSE_PROCFS */
681static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
682static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
683static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
684static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
685#endif /* CONFIG_SND_VERBOSE_PROCFS */
686
687static const struct attribute_group *pcm_dev_attr_groups[];
688
689/**
690 * snd_pcm_new_stream - create a new PCM stream
691 * @pcm: the pcm instance
692 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
693 * @substream_count: the number of substreams
694 *
695 * Creates a new stream for the pcm.
696 * The corresponding stream on the pcm must have been empty before
697 * calling this, i.e. zero must be given to the argument of
698 * snd_pcm_new().
699 *
700 * Return: Zero if successful, or a negative error code on failure.
701 */
702int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
703{
704 int idx, err;
705 struct snd_pcm_str *pstr = &pcm->streams[stream];
706 struct snd_pcm_substream *substream, *prev;
707
708#if IS_ENABLED(CONFIG_SND_PCM_OSS)
709 mutex_init(&pstr->oss.setup_mutex);
710#endif
711 pstr->stream = stream;
712 pstr->pcm = pcm;
713 pstr->substream_count = substream_count;
714 if (!substream_count)
715 return 0;
716
717 snd_device_initialize(&pstr->dev, pcm->card);
718 pstr->dev.groups = pcm_dev_attr_groups;
719 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
720 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
721
722 if (!pcm->internal) {
723 err = snd_pcm_stream_proc_init(pstr);
724 if (err < 0) {
725 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
726 return err;
727 }
728 }
729 prev = NULL;
730 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
731 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
732 if (!substream)
733 return -ENOMEM;
734 substream->pcm = pcm;
735 substream->pstr = pstr;
736 substream->number = idx;
737 substream->stream = stream;
738 sprintf(substream->name, "subdevice #%i", idx);
739 substream->buffer_bytes_max = UINT_MAX;
740 if (prev == NULL)
741 pstr->substream = substream;
742 else
743 prev->next = substream;
744
745 if (!pcm->internal) {
746 err = snd_pcm_substream_proc_init(substream);
747 if (err < 0) {
748 pcm_err(pcm,
749 "Error in snd_pcm_stream_proc_init\n");
750 if (prev == NULL)
751 pstr->substream = NULL;
752 else
753 prev->next = NULL;
754 kfree(substream);
755 return err;
756 }
757 }
758 substream->group = &substream->self_group;
759 spin_lock_init(&substream->self_group.lock);
760 mutex_init(&substream->self_group.mutex);
761 INIT_LIST_HEAD(&substream->self_group.substreams);
762 list_add_tail(&substream->link_list, &substream->self_group.substreams);
763 atomic_set(&substream->mmap_count, 0);
764 prev = substream;
765 }
766 return 0;
767}
768EXPORT_SYMBOL(snd_pcm_new_stream);
769
770static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
771 int playback_count, int capture_count, bool internal,
772 struct snd_pcm **rpcm)
773{
774 struct snd_pcm *pcm;
775 int err;
776 static struct snd_device_ops ops = {
777 .dev_free = snd_pcm_dev_free,
778 .dev_register = snd_pcm_dev_register,
779 .dev_disconnect = snd_pcm_dev_disconnect,
780 };
781 static struct snd_device_ops internal_ops = {
782 .dev_free = snd_pcm_dev_free,
783 };
784
785 if (snd_BUG_ON(!card))
786 return -ENXIO;
787 if (rpcm)
788 *rpcm = NULL;
789 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
790 if (!pcm)
791 return -ENOMEM;
792 pcm->card = card;
793 pcm->device = device;
794 pcm->internal = internal;
795 mutex_init(&pcm->open_mutex);
796 init_waitqueue_head(&pcm->open_wait);
797 INIT_LIST_HEAD(&pcm->list);
798 if (id)
799 strlcpy(pcm->id, id, sizeof(pcm->id));
800
801 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
802 playback_count);
803 if (err < 0)
804 goto free_pcm;
805
806 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
807 if (err < 0)
808 goto free_pcm;
809
810 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
811 internal ? &internal_ops : &ops);
812 if (err < 0)
813 goto free_pcm;
814
815 if (rpcm)
816 *rpcm = pcm;
817 return 0;
818
819free_pcm:
820 snd_pcm_free(pcm);
821 return err;
822}
823
824/**
825 * snd_pcm_new - create a new PCM instance
826 * @card: the card instance
827 * @id: the id string
828 * @device: the device index (zero based)
829 * @playback_count: the number of substreams for playback
830 * @capture_count: the number of substreams for capture
831 * @rpcm: the pointer to store the new pcm instance
832 *
833 * Creates a new PCM instance.
834 *
835 * The pcm operators have to be set afterwards to the new instance
836 * via snd_pcm_set_ops().
837 *
838 * Return: Zero if successful, or a negative error code on failure.
839 */
840int snd_pcm_new(struct snd_card *card, const char *id, int device,
841 int playback_count, int capture_count, struct snd_pcm **rpcm)
842{
843 return _snd_pcm_new(card, id, device, playback_count, capture_count,
844 false, rpcm);
845}
846EXPORT_SYMBOL(snd_pcm_new);
847
848/**
849 * snd_pcm_new_internal - create a new internal PCM instance
850 * @card: the card instance
851 * @id: the id string
852 * @device: the device index (zero based - shared with normal PCMs)
853 * @playback_count: the number of substreams for playback
854 * @capture_count: the number of substreams for capture
855 * @rpcm: the pointer to store the new pcm instance
856 *
857 * Creates a new internal PCM instance with no userspace device or procfs
858 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
859 * will only be used internally by kernel drivers. i.e. it cannot be opened
860 * by userspace. It provides existing ASoC components drivers with a substream
861 * and access to any private data.
862 *
863 * The pcm operators have to be set afterwards to the new instance
864 * via snd_pcm_set_ops().
865 *
866 * Return: Zero if successful, or a negative error code on failure.
867 */
868int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
869 int playback_count, int capture_count,
870 struct snd_pcm **rpcm)
871{
872 return _snd_pcm_new(card, id, device, playback_count, capture_count,
873 true, rpcm);
874}
875EXPORT_SYMBOL(snd_pcm_new_internal);
876
877static void free_chmap(struct snd_pcm_str *pstr)
878{
879 if (pstr->chmap_kctl) {
880 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
881 pstr->chmap_kctl = NULL;
882 }
883}
884
885static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
886{
887 struct snd_pcm_substream *substream, *substream_next;
888#if IS_ENABLED(CONFIG_SND_PCM_OSS)
889 struct snd_pcm_oss_setup *setup, *setupn;
890#endif
891 substream = pstr->substream;
892 while (substream) {
893 substream_next = substream->next;
894 snd_pcm_timer_done(substream);
895 snd_pcm_substream_proc_done(substream);
896 kfree(substream);
897 substream = substream_next;
898 }
899 snd_pcm_stream_proc_done(pstr);
900#if IS_ENABLED(CONFIG_SND_PCM_OSS)
901 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
902 setupn = setup->next;
903 kfree(setup->task_name);
904 kfree(setup);
905 }
906#endif
907 free_chmap(pstr);
908 if (pstr->substream_count)
909 put_device(&pstr->dev);
910}
911
912#if IS_ENABLED(CONFIG_SND_PCM_OSS)
913#define pcm_call_notify(pcm, call) \
914 do { \
915 struct snd_pcm_notify *_notify; \
916 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
917 _notify->call(pcm); \
918 } while (0)
919#else
920#define pcm_call_notify(pcm, call) do {} while (0)
921#endif
922
923static int snd_pcm_free(struct snd_pcm *pcm)
924{
925 if (!pcm)
926 return 0;
927 if (!pcm->internal)
928 pcm_call_notify(pcm, n_unregister);
929 if (pcm->private_free)
930 pcm->private_free(pcm);
931 snd_pcm_lib_preallocate_free_for_all(pcm);
932 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
933 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
934 kfree(pcm);
935 return 0;
936}
937
938static int snd_pcm_dev_free(struct snd_device *device)
939{
940 struct snd_pcm *pcm = device->device_data;
941 return snd_pcm_free(pcm);
942}
943
944int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
945 struct file *file,
946 struct snd_pcm_substream **rsubstream)
947{
948 struct snd_pcm_str * pstr;
949 struct snd_pcm_substream *substream;
950 struct snd_pcm_runtime *runtime;
951 struct snd_card *card;
952 int prefer_subdevice;
953 size_t size;
954
955 if (snd_BUG_ON(!pcm || !rsubstream))
956 return -ENXIO;
957 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
958 stream != SNDRV_PCM_STREAM_CAPTURE))
959 return -EINVAL;
960 *rsubstream = NULL;
961 pstr = &pcm->streams[stream];
962 if (pstr->substream == NULL || pstr->substream_count == 0)
963 return -ENODEV;
964
965 card = pcm->card;
966 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
967
968 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
969 int opposite = !stream;
970
971 for (substream = pcm->streams[opposite].substream; substream;
972 substream = substream->next) {
973 if (SUBSTREAM_BUSY(substream))
974 return -EAGAIN;
975 }
976 }
977
978 if (file->f_flags & O_APPEND) {
979 if (prefer_subdevice < 0) {
980 if (pstr->substream_count > 1)
981 return -EINVAL; /* must be unique */
982 substream = pstr->substream;
983 } else {
984 for (substream = pstr->substream; substream;
985 substream = substream->next)
986 if (substream->number == prefer_subdevice)
987 break;
988 }
989 if (! substream)
990 return -ENODEV;
991 if (! SUBSTREAM_BUSY(substream))
992 return -EBADFD;
993 substream->ref_count++;
994 *rsubstream = substream;
995 return 0;
996 }
997
998 for (substream = pstr->substream; substream; substream = substream->next) {
999 if (!SUBSTREAM_BUSY(substream) &&
1000 (prefer_subdevice == -1 ||
1001 substream->number == prefer_subdevice))
1002 break;
1003 }
1004 if (substream == NULL)
1005 return -EAGAIN;
1006
1007 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
1008 if (runtime == NULL)
1009 return -ENOMEM;
1010
1011 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
1012 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
1013 if (runtime->status == NULL) {
1014 kfree(runtime);
1015 return -ENOMEM;
1016 }
1017 memset((void*)runtime->status, 0, size);
1018
1019 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
1020 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
1021 if (runtime->control == NULL) {
1022 snd_free_pages((void*)runtime->status,
1023 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1024 kfree(runtime);
1025 return -ENOMEM;
1026 }
1027 memset((void*)runtime->control, 0, size);
1028
1029 init_waitqueue_head(&runtime->sleep);
1030 init_waitqueue_head(&runtime->tsleep);
1031
1032 runtime->status->state = SNDRV_PCM_STATE_OPEN;
1033
1034 substream->runtime = runtime;
1035 substream->private_data = pcm->private_data;
1036 substream->ref_count = 1;
1037 substream->f_flags = file->f_flags;
1038 substream->pid = get_pid(task_pid(current));
1039 pstr->substream_opened++;
1040 *rsubstream = substream;
1041 return 0;
1042}
1043
1044void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1045{
1046 struct snd_pcm_runtime *runtime;
1047
1048 if (PCM_RUNTIME_CHECK(substream))
1049 return;
1050 runtime = substream->runtime;
1051 if (runtime->private_free != NULL)
1052 runtime->private_free(runtime);
1053 snd_free_pages((void*)runtime->status,
1054 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1055 snd_free_pages((void*)runtime->control,
1056 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1057 kfree(runtime->hw_constraints.rules);
1058 /* Avoid concurrent access to runtime via PCM timer interface */
1059 if (substream->timer)
1060 spin_lock_irq(&substream->timer->lock);
1061 substream->runtime = NULL;
1062 if (substream->timer)
1063 spin_unlock_irq(&substream->timer->lock);
1064 kfree(runtime);
1065 put_pid(substream->pid);
1066 substream->pid = NULL;
1067 substream->pstr->substream_opened--;
1068}
1069
1070static ssize_t show_pcm_class(struct device *dev,
1071 struct device_attribute *attr, char *buf)
1072{
1073 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1074 struct snd_pcm *pcm = pstr->pcm;
1075 const char *str;
1076 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1077 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1078 [SNDRV_PCM_CLASS_MULTI] = "multi",
1079 [SNDRV_PCM_CLASS_MODEM] = "modem",
1080 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1081 };
1082
1083 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1084 str = "none";
1085 else
1086 str = strs[pcm->dev_class];
1087 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1088}
1089
1090static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1091static struct attribute *pcm_dev_attrs[] = {
1092 &dev_attr_pcm_class.attr,
1093 NULL
1094};
1095
1096static const struct attribute_group pcm_dev_attr_group = {
1097 .attrs = pcm_dev_attrs,
1098};
1099
1100static const struct attribute_group *pcm_dev_attr_groups[] = {
1101 &pcm_dev_attr_group,
1102 NULL
1103};
1104
1105static int snd_pcm_dev_register(struct snd_device *device)
1106{
1107 int cidx, err;
1108 struct snd_pcm_substream *substream;
1109 struct snd_pcm *pcm;
1110
1111 if (snd_BUG_ON(!device || !device->device_data))
1112 return -ENXIO;
1113 pcm = device->device_data;
1114
1115 mutex_lock(®ister_mutex);
1116 err = snd_pcm_add(pcm);
1117 if (err)
1118 goto unlock;
1119 for (cidx = 0; cidx < 2; cidx++) {
1120 int devtype = -1;
1121 if (pcm->streams[cidx].substream == NULL)
1122 continue;
1123 switch (cidx) {
1124 case SNDRV_PCM_STREAM_PLAYBACK:
1125 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1126 break;
1127 case SNDRV_PCM_STREAM_CAPTURE:
1128 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1129 break;
1130 }
1131 /* register pcm */
1132 err = snd_register_device(devtype, pcm->card, pcm->device,
1133 &snd_pcm_f_ops[cidx], pcm,
1134 &pcm->streams[cidx].dev);
1135 if (err < 0) {
1136 list_del_init(&pcm->list);
1137 goto unlock;
1138 }
1139
1140 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1141 snd_pcm_timer_init(substream);
1142 }
1143
1144 pcm_call_notify(pcm, n_register);
1145
1146 unlock:
1147 mutex_unlock(®ister_mutex);
1148 return err;
1149}
1150
1151static int snd_pcm_dev_disconnect(struct snd_device *device)
1152{
1153 struct snd_pcm *pcm = device->device_data;
1154 struct snd_pcm_substream *substream;
1155 int cidx;
1156
1157 mutex_lock(®ister_mutex);
1158 mutex_lock(&pcm->open_mutex);
1159 wake_up(&pcm->open_wait);
1160 list_del_init(&pcm->list);
1161 for (cidx = 0; cidx < 2; cidx++) {
1162 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1163 snd_pcm_stream_lock_irq(substream);
1164 if (substream->runtime) {
1165 if (snd_pcm_running(substream))
1166 snd_pcm_stop(substream,
1167 SNDRV_PCM_STATE_DISCONNECTED);
1168 /* to be sure, set the state unconditionally */
1169 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1170 wake_up(&substream->runtime->sleep);
1171 wake_up(&substream->runtime->tsleep);
1172 }
1173 snd_pcm_stream_unlock_irq(substream);
1174 }
1175 }
1176
1177 pcm_call_notify(pcm, n_disconnect);
1178 for (cidx = 0; cidx < 2; cidx++) {
1179 snd_unregister_device(&pcm->streams[cidx].dev);
1180 free_chmap(&pcm->streams[cidx]);
1181 }
1182 mutex_unlock(&pcm->open_mutex);
1183 mutex_unlock(®ister_mutex);
1184 return 0;
1185}
1186
1187#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1188/**
1189 * snd_pcm_notify - Add/remove the notify list
1190 * @notify: PCM notify list
1191 * @nfree: 0 = register, 1 = unregister
1192 *
1193 * This adds the given notifier to the global list so that the callback is
1194 * called for each registered PCM devices. This exists only for PCM OSS
1195 * emulation, so far.
1196 */
1197int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1198{
1199 struct snd_pcm *pcm;
1200
1201 if (snd_BUG_ON(!notify ||
1202 !notify->n_register ||
1203 !notify->n_unregister ||
1204 !notify->n_disconnect))
1205 return -EINVAL;
1206 mutex_lock(®ister_mutex);
1207 if (nfree) {
1208 list_del(¬ify->list);
1209 list_for_each_entry(pcm, &snd_pcm_devices, list)
1210 notify->n_unregister(pcm);
1211 } else {
1212 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1213 list_for_each_entry(pcm, &snd_pcm_devices, list)
1214 notify->n_register(pcm);
1215 }
1216 mutex_unlock(®ister_mutex);
1217 return 0;
1218}
1219EXPORT_SYMBOL(snd_pcm_notify);
1220#endif /* CONFIG_SND_PCM_OSS */
1221
1222#ifdef CONFIG_SND_PROC_FS
1223/*
1224 * Info interface
1225 */
1226
1227static void snd_pcm_proc_read(struct snd_info_entry *entry,
1228 struct snd_info_buffer *buffer)
1229{
1230 struct snd_pcm *pcm;
1231
1232 mutex_lock(®ister_mutex);
1233 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1234 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1235 pcm->card->number, pcm->device, pcm->id, pcm->name);
1236 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1237 snd_iprintf(buffer, " : playback %i",
1238 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1239 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1240 snd_iprintf(buffer, " : capture %i",
1241 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1242 snd_iprintf(buffer, "\n");
1243 }
1244 mutex_unlock(®ister_mutex);
1245}
1246
1247static struct snd_info_entry *snd_pcm_proc_entry;
1248
1249static void snd_pcm_proc_init(void)
1250{
1251 struct snd_info_entry *entry;
1252
1253 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1254 if (entry) {
1255 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1256 if (snd_info_register(entry) < 0) {
1257 snd_info_free_entry(entry);
1258 entry = NULL;
1259 }
1260 }
1261 snd_pcm_proc_entry = entry;
1262}
1263
1264static void snd_pcm_proc_done(void)
1265{
1266 snd_info_free_entry(snd_pcm_proc_entry);
1267}
1268
1269#else /* !CONFIG_SND_PROC_FS */
1270#define snd_pcm_proc_init()
1271#define snd_pcm_proc_done()
1272#endif /* CONFIG_SND_PROC_FS */
1273
1274
1275/*
1276 * ENTRY functions
1277 */
1278
1279static int __init alsa_pcm_init(void)
1280{
1281 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1282 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1283 snd_pcm_proc_init();
1284 return 0;
1285}
1286
1287static void __exit alsa_pcm_exit(void)
1288{
1289 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1290 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1291 snd_pcm_proc_done();
1292}
1293
1294module_init(alsa_pcm_init)
1295module_exit(alsa_pcm_exit)