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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->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)