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