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1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27#include <linux/device.h>
28#include <sound/core.h>
29#include <sound/minors.h>
30#include <sound/pcm.h>
31#include <sound/control.h>
32#include <sound/info.h>
33
34MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
35MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
36MODULE_LICENSE("GPL");
37
38static LIST_HEAD(snd_pcm_devices);
39static LIST_HEAD(snd_pcm_notify_list);
40static DEFINE_MUTEX(register_mutex);
41
42static int snd_pcm_free(struct snd_pcm *pcm);
43static int snd_pcm_dev_free(struct snd_device *device);
44static int snd_pcm_dev_register(struct snd_device *device);
45static int snd_pcm_dev_disconnect(struct snd_device *device);
46
47static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
48{
49 struct snd_pcm *pcm;
50
51 list_for_each_entry(pcm, &snd_pcm_devices, list) {
52 if (pcm->card == card && pcm->device == device)
53 return pcm;
54 }
55 return NULL;
56}
57
58static int snd_pcm_next(struct snd_card *card, int device)
59{
60 struct snd_pcm *pcm;
61
62 list_for_each_entry(pcm, &snd_pcm_devices, list) {
63 if (pcm->card == card && pcm->device > device)
64 return pcm->device;
65 else if (pcm->card->number > card->number)
66 return -1;
67 }
68 return -1;
69}
70
71static int snd_pcm_add(struct snd_pcm *newpcm)
72{
73 struct snd_pcm *pcm;
74
75 if (newpcm->internal)
76 return 0;
77
78 list_for_each_entry(pcm, &snd_pcm_devices, list) {
79 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
80 return -EBUSY;
81 if (pcm->card->number > newpcm->card->number ||
82 (pcm->card == newpcm->card &&
83 pcm->device > newpcm->device)) {
84 list_add(&newpcm->list, pcm->list.prev);
85 return 0;
86 }
87 }
88 list_add_tail(&newpcm->list, &snd_pcm_devices);
89 return 0;
90}
91
92static int snd_pcm_control_ioctl(struct snd_card *card,
93 struct snd_ctl_file *control,
94 unsigned int cmd, unsigned long arg)
95{
96 switch (cmd) {
97 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
98 {
99 int device;
100
101 if (get_user(device, (int __user *)arg))
102 return -EFAULT;
103 mutex_lock(®ister_mutex);
104 device = snd_pcm_next(card, device);
105 mutex_unlock(®ister_mutex);
106 if (put_user(device, (int __user *)arg))
107 return -EFAULT;
108 return 0;
109 }
110 case SNDRV_CTL_IOCTL_PCM_INFO:
111 {
112 struct snd_pcm_info __user *info;
113 unsigned int device, subdevice;
114 int stream;
115 struct snd_pcm *pcm;
116 struct snd_pcm_str *pstr;
117 struct snd_pcm_substream *substream;
118 int err;
119
120 info = (struct snd_pcm_info __user *)arg;
121 if (get_user(device, &info->device))
122 return -EFAULT;
123 if (get_user(stream, &info->stream))
124 return -EFAULT;
125 if (stream < 0 || stream > 1)
126 return -EINVAL;
127 if (get_user(subdevice, &info->subdevice))
128 return -EFAULT;
129 mutex_lock(®ister_mutex);
130 pcm = snd_pcm_get(card, device);
131 if (pcm == NULL) {
132 err = -ENXIO;
133 goto _error;
134 }
135 pstr = &pcm->streams[stream];
136 if (pstr->substream_count == 0) {
137 err = -ENOENT;
138 goto _error;
139 }
140 if (subdevice >= pstr->substream_count) {
141 err = -ENXIO;
142 goto _error;
143 }
144 for (substream = pstr->substream; substream;
145 substream = substream->next)
146 if (substream->number == (int)subdevice)
147 break;
148 if (substream == NULL) {
149 err = -ENXIO;
150 goto _error;
151 }
152 err = snd_pcm_info_user(substream, info);
153 _error:
154 mutex_unlock(®ister_mutex);
155 return err;
156 }
157 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
158 {
159 int val;
160
161 if (get_user(val, (int __user *)arg))
162 return -EFAULT;
163 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
164 return 0;
165 }
166 }
167 return -ENOIOCTLCMD;
168}
169
170#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
171
172static char *snd_pcm_format_names[] = {
173 FORMAT(S8),
174 FORMAT(U8),
175 FORMAT(S16_LE),
176 FORMAT(S16_BE),
177 FORMAT(U16_LE),
178 FORMAT(U16_BE),
179 FORMAT(S24_LE),
180 FORMAT(S24_BE),
181 FORMAT(U24_LE),
182 FORMAT(U24_BE),
183 FORMAT(S32_LE),
184 FORMAT(S32_BE),
185 FORMAT(U32_LE),
186 FORMAT(U32_BE),
187 FORMAT(FLOAT_LE),
188 FORMAT(FLOAT_BE),
189 FORMAT(FLOAT64_LE),
190 FORMAT(FLOAT64_BE),
191 FORMAT(IEC958_SUBFRAME_LE),
192 FORMAT(IEC958_SUBFRAME_BE),
193 FORMAT(MU_LAW),
194 FORMAT(A_LAW),
195 FORMAT(IMA_ADPCM),
196 FORMAT(MPEG),
197 FORMAT(GSM),
198 FORMAT(SPECIAL),
199 FORMAT(S24_3LE),
200 FORMAT(S24_3BE),
201 FORMAT(U24_3LE),
202 FORMAT(U24_3BE),
203 FORMAT(S20_3LE),
204 FORMAT(S20_3BE),
205 FORMAT(U20_3LE),
206 FORMAT(U20_3BE),
207 FORMAT(S18_3LE),
208 FORMAT(S18_3BE),
209 FORMAT(U18_3LE),
210 FORMAT(U18_3BE),
211 FORMAT(G723_24),
212 FORMAT(G723_24_1B),
213 FORMAT(G723_40),
214 FORMAT(G723_40_1B),
215 FORMAT(DSD_U8),
216 FORMAT(DSD_U16_LE),
217 FORMAT(DSD_U32_LE),
218 FORMAT(DSD_U16_BE),
219 FORMAT(DSD_U32_BE),
220};
221
222/**
223 * snd_pcm_format_name - Return a name string for the given PCM format
224 * @format: PCM format
225 */
226const char *snd_pcm_format_name(snd_pcm_format_t format)
227{
228 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
229 return "Unknown";
230 return snd_pcm_format_names[(__force unsigned int)format];
231}
232EXPORT_SYMBOL_GPL(snd_pcm_format_name);
233
234#ifdef CONFIG_SND_VERBOSE_PROCFS
235
236#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
237#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
238#define READY(v) [SNDRV_PCM_READY_##v] = #v
239#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
240#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
241#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
242#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
243#define START(v) [SNDRV_PCM_START_##v] = #v
244#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
245
246static char *snd_pcm_stream_names[] = {
247 STREAM(PLAYBACK),
248 STREAM(CAPTURE),
249};
250
251static char *snd_pcm_state_names[] = {
252 STATE(OPEN),
253 STATE(SETUP),
254 STATE(PREPARED),
255 STATE(RUNNING),
256 STATE(XRUN),
257 STATE(DRAINING),
258 STATE(PAUSED),
259 STATE(SUSPENDED),
260};
261
262static char *snd_pcm_access_names[] = {
263 ACCESS(MMAP_INTERLEAVED),
264 ACCESS(MMAP_NONINTERLEAVED),
265 ACCESS(MMAP_COMPLEX),
266 ACCESS(RW_INTERLEAVED),
267 ACCESS(RW_NONINTERLEAVED),
268};
269
270static char *snd_pcm_subformat_names[] = {
271 SUBFORMAT(STD),
272};
273
274static char *snd_pcm_tstamp_mode_names[] = {
275 TSTAMP(NONE),
276 TSTAMP(ENABLE),
277};
278
279static const char *snd_pcm_stream_name(int stream)
280{
281 return snd_pcm_stream_names[stream];
282}
283
284static const char *snd_pcm_access_name(snd_pcm_access_t access)
285{
286 return snd_pcm_access_names[(__force int)access];
287}
288
289static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
290{
291 return snd_pcm_subformat_names[(__force int)subformat];
292}
293
294static const char *snd_pcm_tstamp_mode_name(int mode)
295{
296 return snd_pcm_tstamp_mode_names[mode];
297}
298
299static const char *snd_pcm_state_name(snd_pcm_state_t state)
300{
301 return snd_pcm_state_names[(__force int)state];
302}
303
304#if IS_ENABLED(CONFIG_SND_PCM_OSS)
305#include <linux/soundcard.h>
306
307static const char *snd_pcm_oss_format_name(int format)
308{
309 switch (format) {
310 case AFMT_MU_LAW:
311 return "MU_LAW";
312 case AFMT_A_LAW:
313 return "A_LAW";
314 case AFMT_IMA_ADPCM:
315 return "IMA_ADPCM";
316 case AFMT_U8:
317 return "U8";
318 case AFMT_S16_LE:
319 return "S16_LE";
320 case AFMT_S16_BE:
321 return "S16_BE";
322 case AFMT_S8:
323 return "S8";
324 case AFMT_U16_LE:
325 return "U16_LE";
326 case AFMT_U16_BE:
327 return "U16_BE";
328 case AFMT_MPEG:
329 return "MPEG";
330 default:
331 return "unknown";
332 }
333}
334#endif
335
336static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
337 struct snd_info_buffer *buffer)
338{
339 struct snd_pcm_info *info;
340 int err;
341
342 if (! substream)
343 return;
344
345 info = kmalloc(sizeof(*info), GFP_KERNEL);
346 if (!info)
347 return;
348
349 err = snd_pcm_info(substream, info);
350 if (err < 0) {
351 snd_iprintf(buffer, "error %d\n", err);
352 kfree(info);
353 return;
354 }
355 snd_iprintf(buffer, "card: %d\n", info->card);
356 snd_iprintf(buffer, "device: %d\n", info->device);
357 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
358 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
359 snd_iprintf(buffer, "id: %s\n", info->id);
360 snd_iprintf(buffer, "name: %s\n", info->name);
361 snd_iprintf(buffer, "subname: %s\n", info->subname);
362 snd_iprintf(buffer, "class: %d\n", info->dev_class);
363 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
364 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
365 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
366 kfree(info);
367}
368
369static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
370 struct snd_info_buffer *buffer)
371{
372 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
373 buffer);
374}
375
376static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
378{
379 snd_pcm_proc_info_read(entry->private_data, buffer);
380}
381
382static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
383 struct snd_info_buffer *buffer)
384{
385 struct snd_pcm_substream *substream = entry->private_data;
386 struct snd_pcm_runtime *runtime;
387
388 mutex_lock(&substream->pcm->open_mutex);
389 runtime = substream->runtime;
390 if (!runtime) {
391 snd_iprintf(buffer, "closed\n");
392 goto unlock;
393 }
394 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
395 snd_iprintf(buffer, "no setup\n");
396 goto unlock;
397 }
398 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
399 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
400 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
401 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
402 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
403 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
404 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
405#if IS_ENABLED(CONFIG_SND_PCM_OSS)
406 if (substream->oss.oss) {
407 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
408 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
409 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
410 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
411 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
412 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
413 }
414#endif
415 unlock:
416 mutex_unlock(&substream->pcm->open_mutex);
417}
418
419static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
420 struct snd_info_buffer *buffer)
421{
422 struct snd_pcm_substream *substream = entry->private_data;
423 struct snd_pcm_runtime *runtime;
424
425 mutex_lock(&substream->pcm->open_mutex);
426 runtime = substream->runtime;
427 if (!runtime) {
428 snd_iprintf(buffer, "closed\n");
429 goto unlock;
430 }
431 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
432 snd_iprintf(buffer, "no setup\n");
433 goto unlock;
434 }
435 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
436 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
437 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
438 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
439 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
440 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
441 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
442 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
443 unlock:
444 mutex_unlock(&substream->pcm->open_mutex);
445}
446
447static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
448 struct snd_info_buffer *buffer)
449{
450 struct snd_pcm_substream *substream = entry->private_data;
451 struct snd_pcm_runtime *runtime;
452 struct snd_pcm_status status;
453 int err;
454
455 mutex_lock(&substream->pcm->open_mutex);
456 runtime = substream->runtime;
457 if (!runtime) {
458 snd_iprintf(buffer, "closed\n");
459 goto unlock;
460 }
461 memset(&status, 0, sizeof(status));
462 err = snd_pcm_status(substream, &status);
463 if (err < 0) {
464 snd_iprintf(buffer, "error %d\n", err);
465 goto unlock;
466 }
467 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
468 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
469 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
470 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
471 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
472 status.tstamp.tv_sec, status.tstamp.tv_nsec);
473 snd_iprintf(buffer, "delay : %ld\n", status.delay);
474 snd_iprintf(buffer, "avail : %ld\n", status.avail);
475 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
476 snd_iprintf(buffer, "-----\n");
477 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
478 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
479 unlock:
480 mutex_unlock(&substream->pcm->open_mutex);
481}
482
483#ifdef CONFIG_SND_PCM_XRUN_DEBUG
484static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
485 struct snd_info_buffer *buffer)
486{
487 struct snd_pcm_substream *substream = entry->private_data;
488 struct snd_pcm_runtime *runtime;
489
490 snd_pcm_stream_lock_irq(substream);
491 runtime = substream->runtime;
492 if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
493 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
494 snd_pcm_stream_unlock_irq(substream);
495}
496
497static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
498 struct snd_info_buffer *buffer)
499{
500 struct snd_pcm_str *pstr = entry->private_data;
501 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
502}
503
504static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
505 struct snd_info_buffer *buffer)
506{
507 struct snd_pcm_str *pstr = entry->private_data;
508 char line[64];
509 if (!snd_info_get_line(buffer, line, sizeof(line)))
510 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
511}
512#endif
513
514static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
515{
516 struct snd_pcm *pcm = pstr->pcm;
517 struct snd_info_entry *entry;
518 char name[16];
519
520 sprintf(name, "pcm%i%c", pcm->device,
521 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
522 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
523 return -ENOMEM;
524 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
525 if (snd_info_register(entry) < 0) {
526 snd_info_free_entry(entry);
527 return -ENOMEM;
528 }
529 pstr->proc_root = entry;
530
531 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
532 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
533 if (snd_info_register(entry) < 0) {
534 snd_info_free_entry(entry);
535 entry = NULL;
536 }
537 }
538 pstr->proc_info_entry = entry;
539
540#ifdef CONFIG_SND_PCM_XRUN_DEBUG
541 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
542 pstr->proc_root)) != NULL) {
543 entry->c.text.read = snd_pcm_xrun_debug_read;
544 entry->c.text.write = snd_pcm_xrun_debug_write;
545 entry->mode |= S_IWUSR;
546 entry->private_data = pstr;
547 if (snd_info_register(entry) < 0) {
548 snd_info_free_entry(entry);
549 entry = NULL;
550 }
551 }
552 pstr->proc_xrun_debug_entry = entry;
553#endif
554 return 0;
555}
556
557static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
558{
559#ifdef CONFIG_SND_PCM_XRUN_DEBUG
560 snd_info_free_entry(pstr->proc_xrun_debug_entry);
561 pstr->proc_xrun_debug_entry = NULL;
562#endif
563 snd_info_free_entry(pstr->proc_info_entry);
564 pstr->proc_info_entry = NULL;
565 snd_info_free_entry(pstr->proc_root);
566 pstr->proc_root = NULL;
567 return 0;
568}
569
570static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
571{
572 struct snd_info_entry *entry;
573 struct snd_card *card;
574 char name[16];
575
576 card = substream->pcm->card;
577
578 sprintf(name, "sub%i", substream->number);
579 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
580 return -ENOMEM;
581 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
582 if (snd_info_register(entry) < 0) {
583 snd_info_free_entry(entry);
584 return -ENOMEM;
585 }
586 substream->proc_root = entry;
587
588 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
589 snd_info_set_text_ops(entry, substream,
590 snd_pcm_substream_proc_info_read);
591 if (snd_info_register(entry) < 0) {
592 snd_info_free_entry(entry);
593 entry = NULL;
594 }
595 }
596 substream->proc_info_entry = entry;
597
598 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
599 snd_info_set_text_ops(entry, substream,
600 snd_pcm_substream_proc_hw_params_read);
601 if (snd_info_register(entry) < 0) {
602 snd_info_free_entry(entry);
603 entry = NULL;
604 }
605 }
606 substream->proc_hw_params_entry = entry;
607
608 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
609 snd_info_set_text_ops(entry, substream,
610 snd_pcm_substream_proc_sw_params_read);
611 if (snd_info_register(entry) < 0) {
612 snd_info_free_entry(entry);
613 entry = NULL;
614 }
615 }
616 substream->proc_sw_params_entry = entry;
617
618 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
619 snd_info_set_text_ops(entry, substream,
620 snd_pcm_substream_proc_status_read);
621 if (snd_info_register(entry) < 0) {
622 snd_info_free_entry(entry);
623 entry = NULL;
624 }
625 }
626 substream->proc_status_entry = entry;
627
628#ifdef CONFIG_SND_PCM_XRUN_DEBUG
629 entry = snd_info_create_card_entry(card, "xrun_injection",
630 substream->proc_root);
631 if (entry) {
632 entry->private_data = substream;
633 entry->c.text.read = NULL;
634 entry->c.text.write = snd_pcm_xrun_injection_write;
635 entry->mode = S_IFREG | S_IWUSR;
636 if (snd_info_register(entry) < 0) {
637 snd_info_free_entry(entry);
638 entry = NULL;
639 }
640 }
641 substream->proc_xrun_injection_entry = entry;
642#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
643
644 return 0;
645}
646
647static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
648{
649 snd_info_free_entry(substream->proc_info_entry);
650 substream->proc_info_entry = NULL;
651 snd_info_free_entry(substream->proc_hw_params_entry);
652 substream->proc_hw_params_entry = NULL;
653 snd_info_free_entry(substream->proc_sw_params_entry);
654 substream->proc_sw_params_entry = NULL;
655 snd_info_free_entry(substream->proc_status_entry);
656 substream->proc_status_entry = NULL;
657#ifdef CONFIG_SND_PCM_XRUN_DEBUG
658 snd_info_free_entry(substream->proc_xrun_injection_entry);
659 substream->proc_xrun_injection_entry = NULL;
660#endif
661 snd_info_free_entry(substream->proc_root);
662 substream->proc_root = NULL;
663 return 0;
664}
665#else /* !CONFIG_SND_VERBOSE_PROCFS */
666static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
667static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
668static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
669static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
670#endif /* CONFIG_SND_VERBOSE_PROCFS */
671
672static const struct attribute_group *pcm_dev_attr_groups[];
673
674/**
675 * snd_pcm_new_stream - create a new PCM stream
676 * @pcm: the pcm instance
677 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
678 * @substream_count: the number of substreams
679 *
680 * Creates a new stream for the pcm.
681 * The corresponding stream on the pcm must have been empty before
682 * calling this, i.e. zero must be given to the argument of
683 * snd_pcm_new().
684 *
685 * Return: Zero if successful, or a negative error code on failure.
686 */
687int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
688{
689 int idx, err;
690 struct snd_pcm_str *pstr = &pcm->streams[stream];
691 struct snd_pcm_substream *substream, *prev;
692
693#if IS_ENABLED(CONFIG_SND_PCM_OSS)
694 mutex_init(&pstr->oss.setup_mutex);
695#endif
696 pstr->stream = stream;
697 pstr->pcm = pcm;
698 pstr->substream_count = substream_count;
699 if (!substream_count)
700 return 0;
701
702 snd_device_initialize(&pstr->dev, pcm->card);
703 pstr->dev.groups = pcm_dev_attr_groups;
704 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
705 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
706
707 if (!pcm->internal) {
708 err = snd_pcm_stream_proc_init(pstr);
709 if (err < 0) {
710 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
711 return err;
712 }
713 }
714 prev = NULL;
715 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
716 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
717 if (!substream)
718 return -ENOMEM;
719 substream->pcm = pcm;
720 substream->pstr = pstr;
721 substream->number = idx;
722 substream->stream = stream;
723 sprintf(substream->name, "subdevice #%i", idx);
724 substream->buffer_bytes_max = UINT_MAX;
725 if (prev == NULL)
726 pstr->substream = substream;
727 else
728 prev->next = substream;
729
730 if (!pcm->internal) {
731 err = snd_pcm_substream_proc_init(substream);
732 if (err < 0) {
733 pcm_err(pcm,
734 "Error in snd_pcm_stream_proc_init\n");
735 if (prev == NULL)
736 pstr->substream = NULL;
737 else
738 prev->next = NULL;
739 kfree(substream);
740 return err;
741 }
742 }
743 substream->group = &substream->self_group;
744 spin_lock_init(&substream->self_group.lock);
745 mutex_init(&substream->self_group.mutex);
746 INIT_LIST_HEAD(&substream->self_group.substreams);
747 list_add_tail(&substream->link_list, &substream->self_group.substreams);
748 atomic_set(&substream->mmap_count, 0);
749 prev = substream;
750 }
751 return 0;
752}
753EXPORT_SYMBOL(snd_pcm_new_stream);
754
755static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
756 int playback_count, int capture_count, bool internal,
757 struct snd_pcm **rpcm)
758{
759 struct snd_pcm *pcm;
760 int err;
761 static struct snd_device_ops ops = {
762 .dev_free = snd_pcm_dev_free,
763 .dev_register = snd_pcm_dev_register,
764 .dev_disconnect = snd_pcm_dev_disconnect,
765 };
766
767 if (snd_BUG_ON(!card))
768 return -ENXIO;
769 if (rpcm)
770 *rpcm = NULL;
771 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
772 if (!pcm)
773 return -ENOMEM;
774 pcm->card = card;
775 pcm->device = device;
776 pcm->internal = internal;
777 mutex_init(&pcm->open_mutex);
778 init_waitqueue_head(&pcm->open_wait);
779 INIT_LIST_HEAD(&pcm->list);
780 if (id)
781 strlcpy(pcm->id, id, sizeof(pcm->id));
782 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
783 snd_pcm_free(pcm);
784 return err;
785 }
786 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
787 snd_pcm_free(pcm);
788 return err;
789 }
790 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
791 snd_pcm_free(pcm);
792 return err;
793 }
794 if (rpcm)
795 *rpcm = pcm;
796 return 0;
797}
798
799/**
800 * snd_pcm_new - create a new PCM instance
801 * @card: the card instance
802 * @id: the id string
803 * @device: the device index (zero based)
804 * @playback_count: the number of substreams for playback
805 * @capture_count: the number of substreams for capture
806 * @rpcm: the pointer to store the new pcm instance
807 *
808 * Creates a new PCM instance.
809 *
810 * The pcm operators have to be set afterwards to the new instance
811 * via snd_pcm_set_ops().
812 *
813 * Return: Zero if successful, or a negative error code on failure.
814 */
815int snd_pcm_new(struct snd_card *card, const char *id, int device,
816 int playback_count, int capture_count, struct snd_pcm **rpcm)
817{
818 return _snd_pcm_new(card, id, device, playback_count, capture_count,
819 false, rpcm);
820}
821EXPORT_SYMBOL(snd_pcm_new);
822
823/**
824 * snd_pcm_new_internal - create a new internal PCM instance
825 * @card: the card instance
826 * @id: the id string
827 * @device: the device index (zero based - shared with normal PCMs)
828 * @playback_count: the number of substreams for playback
829 * @capture_count: the number of substreams for capture
830 * @rpcm: the pointer to store the new pcm instance
831 *
832 * Creates a new internal PCM instance with no userspace device or procfs
833 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
834 * will only be used internally by kernel drivers. i.e. it cannot be opened
835 * by userspace. It provides existing ASoC components drivers with a substream
836 * and access to any private data.
837 *
838 * The pcm operators have to be set afterwards to the new instance
839 * via snd_pcm_set_ops().
840 *
841 * Return: Zero if successful, or a negative error code on failure.
842 */
843int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
844 int playback_count, int capture_count,
845 struct snd_pcm **rpcm)
846{
847 return _snd_pcm_new(card, id, device, playback_count, capture_count,
848 true, rpcm);
849}
850EXPORT_SYMBOL(snd_pcm_new_internal);
851
852static void free_chmap(struct snd_pcm_str *pstr)
853{
854 if (pstr->chmap_kctl) {
855 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
856 pstr->chmap_kctl = NULL;
857 }
858}
859
860static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
861{
862 struct snd_pcm_substream *substream, *substream_next;
863#if IS_ENABLED(CONFIG_SND_PCM_OSS)
864 struct snd_pcm_oss_setup *setup, *setupn;
865#endif
866 substream = pstr->substream;
867 while (substream) {
868 substream_next = substream->next;
869 snd_pcm_timer_done(substream);
870 snd_pcm_substream_proc_done(substream);
871 kfree(substream);
872 substream = substream_next;
873 }
874 snd_pcm_stream_proc_done(pstr);
875#if IS_ENABLED(CONFIG_SND_PCM_OSS)
876 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
877 setupn = setup->next;
878 kfree(setup->task_name);
879 kfree(setup);
880 }
881#endif
882 free_chmap(pstr);
883 if (pstr->substream_count)
884 put_device(&pstr->dev);
885}
886
887static int snd_pcm_free(struct snd_pcm *pcm)
888{
889 struct snd_pcm_notify *notify;
890
891 if (!pcm)
892 return 0;
893 if (!pcm->internal) {
894 list_for_each_entry(notify, &snd_pcm_notify_list, list)
895 notify->n_unregister(pcm);
896 }
897 if (pcm->private_free)
898 pcm->private_free(pcm);
899 snd_pcm_lib_preallocate_free_for_all(pcm);
900 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
901 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
902 kfree(pcm);
903 return 0;
904}
905
906static int snd_pcm_dev_free(struct snd_device *device)
907{
908 struct snd_pcm *pcm = device->device_data;
909 return snd_pcm_free(pcm);
910}
911
912int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
913 struct file *file,
914 struct snd_pcm_substream **rsubstream)
915{
916 struct snd_pcm_str * pstr;
917 struct snd_pcm_substream *substream;
918 struct snd_pcm_runtime *runtime;
919 struct snd_card *card;
920 int prefer_subdevice;
921 size_t size;
922
923 if (snd_BUG_ON(!pcm || !rsubstream))
924 return -ENXIO;
925 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
926 stream != SNDRV_PCM_STREAM_CAPTURE))
927 return -EINVAL;
928 *rsubstream = NULL;
929 pstr = &pcm->streams[stream];
930 if (pstr->substream == NULL || pstr->substream_count == 0)
931 return -ENODEV;
932
933 card = pcm->card;
934 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
935
936 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
937 int opposite = !stream;
938
939 for (substream = pcm->streams[opposite].substream; substream;
940 substream = substream->next) {
941 if (SUBSTREAM_BUSY(substream))
942 return -EAGAIN;
943 }
944 }
945
946 if (file->f_flags & O_APPEND) {
947 if (prefer_subdevice < 0) {
948 if (pstr->substream_count > 1)
949 return -EINVAL; /* must be unique */
950 substream = pstr->substream;
951 } else {
952 for (substream = pstr->substream; substream;
953 substream = substream->next)
954 if (substream->number == prefer_subdevice)
955 break;
956 }
957 if (! substream)
958 return -ENODEV;
959 if (! SUBSTREAM_BUSY(substream))
960 return -EBADFD;
961 substream->ref_count++;
962 *rsubstream = substream;
963 return 0;
964 }
965
966 for (substream = pstr->substream; substream; substream = substream->next) {
967 if (!SUBSTREAM_BUSY(substream) &&
968 (prefer_subdevice == -1 ||
969 substream->number == prefer_subdevice))
970 break;
971 }
972 if (substream == NULL)
973 return -EAGAIN;
974
975 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
976 if (runtime == NULL)
977 return -ENOMEM;
978
979 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
980 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
981 if (runtime->status == NULL) {
982 kfree(runtime);
983 return -ENOMEM;
984 }
985 memset((void*)runtime->status, 0, size);
986
987 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
988 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
989 if (runtime->control == NULL) {
990 snd_free_pages((void*)runtime->status,
991 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
992 kfree(runtime);
993 return -ENOMEM;
994 }
995 memset((void*)runtime->control, 0, size);
996
997 init_waitqueue_head(&runtime->sleep);
998 init_waitqueue_head(&runtime->tsleep);
999
1000 runtime->status->state = SNDRV_PCM_STATE_OPEN;
1001
1002 substream->runtime = runtime;
1003 substream->private_data = pcm->private_data;
1004 substream->ref_count = 1;
1005 substream->f_flags = file->f_flags;
1006 substream->pid = get_pid(task_pid(current));
1007 pstr->substream_opened++;
1008 *rsubstream = substream;
1009 return 0;
1010}
1011
1012void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1013{
1014 struct snd_pcm_runtime *runtime;
1015
1016 if (PCM_RUNTIME_CHECK(substream))
1017 return;
1018 runtime = substream->runtime;
1019 if (runtime->private_free != NULL)
1020 runtime->private_free(runtime);
1021 snd_free_pages((void*)runtime->status,
1022 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1023 snd_free_pages((void*)runtime->control,
1024 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1025 kfree(runtime->hw_constraints.rules);
1026 kfree(runtime);
1027 substream->runtime = NULL;
1028 put_pid(substream->pid);
1029 substream->pid = NULL;
1030 substream->pstr->substream_opened--;
1031}
1032
1033static ssize_t show_pcm_class(struct device *dev,
1034 struct device_attribute *attr, char *buf)
1035{
1036 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1037 struct snd_pcm *pcm = pstr->pcm;
1038 const char *str;
1039 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1040 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1041 [SNDRV_PCM_CLASS_MULTI] = "multi",
1042 [SNDRV_PCM_CLASS_MODEM] = "modem",
1043 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1044 };
1045
1046 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1047 str = "none";
1048 else
1049 str = strs[pcm->dev_class];
1050 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1051}
1052
1053static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1054static struct attribute *pcm_dev_attrs[] = {
1055 &dev_attr_pcm_class.attr,
1056 NULL
1057};
1058
1059static struct attribute_group pcm_dev_attr_group = {
1060 .attrs = pcm_dev_attrs,
1061};
1062
1063static const struct attribute_group *pcm_dev_attr_groups[] = {
1064 &pcm_dev_attr_group,
1065 NULL
1066};
1067
1068static int snd_pcm_dev_register(struct snd_device *device)
1069{
1070 int cidx, err;
1071 struct snd_pcm_substream *substream;
1072 struct snd_pcm_notify *notify;
1073 struct snd_pcm *pcm;
1074
1075 if (snd_BUG_ON(!device || !device->device_data))
1076 return -ENXIO;
1077 pcm = device->device_data;
1078 if (pcm->internal)
1079 return 0;
1080
1081 mutex_lock(®ister_mutex);
1082 err = snd_pcm_add(pcm);
1083 if (err)
1084 goto unlock;
1085 for (cidx = 0; cidx < 2; cidx++) {
1086 int devtype = -1;
1087 if (pcm->streams[cidx].substream == NULL)
1088 continue;
1089 switch (cidx) {
1090 case SNDRV_PCM_STREAM_PLAYBACK:
1091 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1092 break;
1093 case SNDRV_PCM_STREAM_CAPTURE:
1094 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1095 break;
1096 }
1097 /* register pcm */
1098 err = snd_register_device(devtype, pcm->card, pcm->device,
1099 &snd_pcm_f_ops[cidx], pcm,
1100 &pcm->streams[cidx].dev);
1101 if (err < 0) {
1102 list_del_init(&pcm->list);
1103 goto unlock;
1104 }
1105
1106 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1107 snd_pcm_timer_init(substream);
1108 }
1109
1110 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1111 notify->n_register(pcm);
1112
1113 unlock:
1114 mutex_unlock(®ister_mutex);
1115 return err;
1116}
1117
1118static int snd_pcm_dev_disconnect(struct snd_device *device)
1119{
1120 struct snd_pcm *pcm = device->device_data;
1121 struct snd_pcm_notify *notify;
1122 struct snd_pcm_substream *substream;
1123 int cidx;
1124
1125 mutex_lock(®ister_mutex);
1126 mutex_lock(&pcm->open_mutex);
1127 wake_up(&pcm->open_wait);
1128 list_del_init(&pcm->list);
1129 for (cidx = 0; cidx < 2; cidx++) {
1130 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1131 snd_pcm_stream_lock_irq(substream);
1132 if (substream->runtime) {
1133 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1134 wake_up(&substream->runtime->sleep);
1135 wake_up(&substream->runtime->tsleep);
1136 }
1137 snd_pcm_stream_unlock_irq(substream);
1138 }
1139 }
1140 if (!pcm->internal) {
1141 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1142 notify->n_disconnect(pcm);
1143 }
1144 for (cidx = 0; cidx < 2; cidx++) {
1145 if (!pcm->internal)
1146 snd_unregister_device(&pcm->streams[cidx].dev);
1147 free_chmap(&pcm->streams[cidx]);
1148 }
1149 mutex_unlock(&pcm->open_mutex);
1150 mutex_unlock(®ister_mutex);
1151 return 0;
1152}
1153
1154/**
1155 * snd_pcm_notify - Add/remove the notify list
1156 * @notify: PCM notify list
1157 * @nfree: 0 = register, 1 = unregister
1158 *
1159 * This adds the given notifier to the global list so that the callback is
1160 * called for each registered PCM devices. This exists only for PCM OSS
1161 * emulation, so far.
1162 */
1163int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1164{
1165 struct snd_pcm *pcm;
1166
1167 if (snd_BUG_ON(!notify ||
1168 !notify->n_register ||
1169 !notify->n_unregister ||
1170 !notify->n_disconnect))
1171 return -EINVAL;
1172 mutex_lock(®ister_mutex);
1173 if (nfree) {
1174 list_del(¬ify->list);
1175 list_for_each_entry(pcm, &snd_pcm_devices, list)
1176 notify->n_unregister(pcm);
1177 } else {
1178 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1179 list_for_each_entry(pcm, &snd_pcm_devices, list)
1180 notify->n_register(pcm);
1181 }
1182 mutex_unlock(®ister_mutex);
1183 return 0;
1184}
1185EXPORT_SYMBOL(snd_pcm_notify);
1186
1187#ifdef CONFIG_SND_PROC_FS
1188/*
1189 * Info interface
1190 */
1191
1192static void snd_pcm_proc_read(struct snd_info_entry *entry,
1193 struct snd_info_buffer *buffer)
1194{
1195 struct snd_pcm *pcm;
1196
1197 mutex_lock(®ister_mutex);
1198 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1199 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1200 pcm->card->number, pcm->device, pcm->id, pcm->name);
1201 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1202 snd_iprintf(buffer, " : playback %i",
1203 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1204 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1205 snd_iprintf(buffer, " : capture %i",
1206 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1207 snd_iprintf(buffer, "\n");
1208 }
1209 mutex_unlock(®ister_mutex);
1210}
1211
1212static struct snd_info_entry *snd_pcm_proc_entry;
1213
1214static void snd_pcm_proc_init(void)
1215{
1216 struct snd_info_entry *entry;
1217
1218 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1219 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1220 if (snd_info_register(entry) < 0) {
1221 snd_info_free_entry(entry);
1222 entry = NULL;
1223 }
1224 }
1225 snd_pcm_proc_entry = entry;
1226}
1227
1228static void snd_pcm_proc_done(void)
1229{
1230 snd_info_free_entry(snd_pcm_proc_entry);
1231}
1232
1233#else /* !CONFIG_SND_PROC_FS */
1234#define snd_pcm_proc_init()
1235#define snd_pcm_proc_done()
1236#endif /* CONFIG_SND_PROC_FS */
1237
1238
1239/*
1240 * ENTRY functions
1241 */
1242
1243static int __init alsa_pcm_init(void)
1244{
1245 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1246 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1247 snd_pcm_proc_init();
1248 return 0;
1249}
1250
1251static void __exit alsa_pcm_exit(void)
1252{
1253 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1254 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1255 snd_pcm_proc_done();
1256}
1257
1258module_init(alsa_pcm_init)
1259module_exit(alsa_pcm_exit)
1/*
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)