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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 snd_pcm_free_stream(struct snd_pcm_str * pstr)
853{
854 struct snd_pcm_substream *substream, *substream_next;
855#if IS_ENABLED(CONFIG_SND_PCM_OSS)
856 struct snd_pcm_oss_setup *setup, *setupn;
857#endif
858 substream = pstr->substream;
859 while (substream) {
860 substream_next = substream->next;
861 snd_pcm_timer_done(substream);
862 snd_pcm_substream_proc_done(substream);
863 kfree(substream);
864 substream = substream_next;
865 }
866 snd_pcm_stream_proc_done(pstr);
867#if IS_ENABLED(CONFIG_SND_PCM_OSS)
868 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
869 setupn = setup->next;
870 kfree(setup->task_name);
871 kfree(setup);
872 }
873#endif
874 if (pstr->substream_count)
875 put_device(&pstr->dev);
876}
877
878static int snd_pcm_free(struct snd_pcm *pcm)
879{
880 struct snd_pcm_notify *notify;
881
882 if (!pcm)
883 return 0;
884 if (!pcm->internal) {
885 list_for_each_entry(notify, &snd_pcm_notify_list, list)
886 notify->n_unregister(pcm);
887 }
888 if (pcm->private_free)
889 pcm->private_free(pcm);
890 snd_pcm_lib_preallocate_free_for_all(pcm);
891 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
892 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
893 kfree(pcm);
894 return 0;
895}
896
897static int snd_pcm_dev_free(struct snd_device *device)
898{
899 struct snd_pcm *pcm = device->device_data;
900 return snd_pcm_free(pcm);
901}
902
903int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
904 struct file *file,
905 struct snd_pcm_substream **rsubstream)
906{
907 struct snd_pcm_str * pstr;
908 struct snd_pcm_substream *substream;
909 struct snd_pcm_runtime *runtime;
910 struct snd_card *card;
911 int prefer_subdevice;
912 size_t size;
913
914 if (snd_BUG_ON(!pcm || !rsubstream))
915 return -ENXIO;
916 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
917 stream != SNDRV_PCM_STREAM_CAPTURE))
918 return -EINVAL;
919 *rsubstream = NULL;
920 pstr = &pcm->streams[stream];
921 if (pstr->substream == NULL || pstr->substream_count == 0)
922 return -ENODEV;
923
924 card = pcm->card;
925 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
926
927 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
928 int opposite = !stream;
929
930 for (substream = pcm->streams[opposite].substream; substream;
931 substream = substream->next) {
932 if (SUBSTREAM_BUSY(substream))
933 return -EAGAIN;
934 }
935 }
936
937 if (file->f_flags & O_APPEND) {
938 if (prefer_subdevice < 0) {
939 if (pstr->substream_count > 1)
940 return -EINVAL; /* must be unique */
941 substream = pstr->substream;
942 } else {
943 for (substream = pstr->substream; substream;
944 substream = substream->next)
945 if (substream->number == prefer_subdevice)
946 break;
947 }
948 if (! substream)
949 return -ENODEV;
950 if (! SUBSTREAM_BUSY(substream))
951 return -EBADFD;
952 substream->ref_count++;
953 *rsubstream = substream;
954 return 0;
955 }
956
957 for (substream = pstr->substream; substream; substream = substream->next) {
958 if (!SUBSTREAM_BUSY(substream) &&
959 (prefer_subdevice == -1 ||
960 substream->number == prefer_subdevice))
961 break;
962 }
963 if (substream == NULL)
964 return -EAGAIN;
965
966 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
967 if (runtime == NULL)
968 return -ENOMEM;
969
970 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
971 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
972 if (runtime->status == NULL) {
973 kfree(runtime);
974 return -ENOMEM;
975 }
976 memset((void*)runtime->status, 0, size);
977
978 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
979 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
980 if (runtime->control == NULL) {
981 snd_free_pages((void*)runtime->status,
982 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
983 kfree(runtime);
984 return -ENOMEM;
985 }
986 memset((void*)runtime->control, 0, size);
987
988 init_waitqueue_head(&runtime->sleep);
989 init_waitqueue_head(&runtime->tsleep);
990
991 runtime->status->state = SNDRV_PCM_STATE_OPEN;
992
993 substream->runtime = runtime;
994 substream->private_data = pcm->private_data;
995 substream->ref_count = 1;
996 substream->f_flags = file->f_flags;
997 substream->pid = get_pid(task_pid(current));
998 pstr->substream_opened++;
999 *rsubstream = substream;
1000 return 0;
1001}
1002
1003void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1004{
1005 struct snd_pcm_runtime *runtime;
1006
1007 if (PCM_RUNTIME_CHECK(substream))
1008 return;
1009 runtime = substream->runtime;
1010 if (runtime->private_free != NULL)
1011 runtime->private_free(runtime);
1012 snd_free_pages((void*)runtime->status,
1013 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1014 snd_free_pages((void*)runtime->control,
1015 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1016 kfree(runtime->hw_constraints.rules);
1017 kfree(runtime);
1018 substream->runtime = NULL;
1019 put_pid(substream->pid);
1020 substream->pid = NULL;
1021 substream->pstr->substream_opened--;
1022}
1023
1024static ssize_t show_pcm_class(struct device *dev,
1025 struct device_attribute *attr, char *buf)
1026{
1027 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1028 struct snd_pcm *pcm = pstr->pcm;
1029 const char *str;
1030 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1031 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1032 [SNDRV_PCM_CLASS_MULTI] = "multi",
1033 [SNDRV_PCM_CLASS_MODEM] = "modem",
1034 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1035 };
1036
1037 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1038 str = "none";
1039 else
1040 str = strs[pcm->dev_class];
1041 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1042}
1043
1044static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1045static struct attribute *pcm_dev_attrs[] = {
1046 &dev_attr_pcm_class.attr,
1047 NULL
1048};
1049
1050static struct attribute_group pcm_dev_attr_group = {
1051 .attrs = pcm_dev_attrs,
1052};
1053
1054static const struct attribute_group *pcm_dev_attr_groups[] = {
1055 &pcm_dev_attr_group,
1056 NULL
1057};
1058
1059static int snd_pcm_dev_register(struct snd_device *device)
1060{
1061 int cidx, err;
1062 struct snd_pcm_substream *substream;
1063 struct snd_pcm_notify *notify;
1064 struct snd_pcm *pcm;
1065
1066 if (snd_BUG_ON(!device || !device->device_data))
1067 return -ENXIO;
1068 pcm = device->device_data;
1069 if (pcm->internal)
1070 return 0;
1071
1072 mutex_lock(®ister_mutex);
1073 err = snd_pcm_add(pcm);
1074 if (err)
1075 goto unlock;
1076 for (cidx = 0; cidx < 2; cidx++) {
1077 int devtype = -1;
1078 if (pcm->streams[cidx].substream == NULL)
1079 continue;
1080 switch (cidx) {
1081 case SNDRV_PCM_STREAM_PLAYBACK:
1082 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1083 break;
1084 case SNDRV_PCM_STREAM_CAPTURE:
1085 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1086 break;
1087 }
1088 /* register pcm */
1089 err = snd_register_device(devtype, pcm->card, pcm->device,
1090 &snd_pcm_f_ops[cidx], pcm,
1091 &pcm->streams[cidx].dev);
1092 if (err < 0) {
1093 list_del_init(&pcm->list);
1094 goto unlock;
1095 }
1096
1097 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1098 snd_pcm_timer_init(substream);
1099 }
1100
1101 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1102 notify->n_register(pcm);
1103
1104 unlock:
1105 mutex_unlock(®ister_mutex);
1106 return err;
1107}
1108
1109static int snd_pcm_dev_disconnect(struct snd_device *device)
1110{
1111 struct snd_pcm *pcm = device->device_data;
1112 struct snd_pcm_notify *notify;
1113 struct snd_pcm_substream *substream;
1114 int cidx;
1115
1116 mutex_lock(®ister_mutex);
1117 mutex_lock(&pcm->open_mutex);
1118 wake_up(&pcm->open_wait);
1119 list_del_init(&pcm->list);
1120 for (cidx = 0; cidx < 2; cidx++) {
1121 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1122 snd_pcm_stream_lock_irq(substream);
1123 if (substream->runtime) {
1124 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1125 wake_up(&substream->runtime->sleep);
1126 wake_up(&substream->runtime->tsleep);
1127 }
1128 snd_pcm_stream_unlock_irq(substream);
1129 }
1130 }
1131 if (!pcm->internal) {
1132 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1133 notify->n_disconnect(pcm);
1134 }
1135 for (cidx = 0; cidx < 2; cidx++) {
1136 if (!pcm->internal)
1137 snd_unregister_device(&pcm->streams[cidx].dev);
1138 if (pcm->streams[cidx].chmap_kctl) {
1139 snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1140 pcm->streams[cidx].chmap_kctl = NULL;
1141 }
1142 }
1143 mutex_unlock(&pcm->open_mutex);
1144 mutex_unlock(®ister_mutex);
1145 return 0;
1146}
1147
1148/**
1149 * snd_pcm_notify - Add/remove the notify list
1150 * @notify: PCM notify list
1151 * @nfree: 0 = register, 1 = unregister
1152 *
1153 * This adds the given notifier to the global list so that the callback is
1154 * called for each registered PCM devices. This exists only for PCM OSS
1155 * emulation, so far.
1156 */
1157int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1158{
1159 struct snd_pcm *pcm;
1160
1161 if (snd_BUG_ON(!notify ||
1162 !notify->n_register ||
1163 !notify->n_unregister ||
1164 !notify->n_disconnect))
1165 return -EINVAL;
1166 mutex_lock(®ister_mutex);
1167 if (nfree) {
1168 list_del(¬ify->list);
1169 list_for_each_entry(pcm, &snd_pcm_devices, list)
1170 notify->n_unregister(pcm);
1171 } else {
1172 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1173 list_for_each_entry(pcm, &snd_pcm_devices, list)
1174 notify->n_register(pcm);
1175 }
1176 mutex_unlock(®ister_mutex);
1177 return 0;
1178}
1179EXPORT_SYMBOL(snd_pcm_notify);
1180
1181#ifdef CONFIG_SND_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_SND_PROC_FS */
1228#define snd_pcm_proc_init()
1229#define snd_pcm_proc_done()
1230#endif /* CONFIG_SND_PROC_FS */
1231
1232
1233/*
1234 * ENTRY functions
1235 */
1236
1237static int __init alsa_pcm_init(void)
1238{
1239 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1240 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1241 snd_pcm_proc_init();
1242 return 0;
1243}
1244
1245static void __exit alsa_pcm_exit(void)
1246{
1247 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1248 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1249 snd_pcm_proc_done();
1250}
1251
1252module_init(alsa_pcm_init)
1253module_exit(alsa_pcm_exit)
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27#include <linux/device.h>
28#include <sound/core.h>
29#include <sound/minors.h>
30#include <sound/pcm.h>
31#include <sound/timer.h>
32#include <sound/control.h>
33#include <sound/info.h>
34
35#include "pcm_local.h"
36
37MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
38MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
39MODULE_LICENSE("GPL");
40
41static LIST_HEAD(snd_pcm_devices);
42static DEFINE_MUTEX(register_mutex);
43#if IS_ENABLED(CONFIG_SND_PCM_OSS)
44static LIST_HEAD(snd_pcm_notify_list);
45#endif
46
47static int snd_pcm_free(struct snd_pcm *pcm);
48static int snd_pcm_dev_free(struct snd_device *device);
49static int snd_pcm_dev_register(struct snd_device *device);
50static int snd_pcm_dev_disconnect(struct snd_device *device);
51
52static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
53{
54 struct snd_pcm *pcm;
55
56 list_for_each_entry(pcm, &snd_pcm_devices, list) {
57 if (pcm->card == card && pcm->device == device)
58 return pcm;
59 }
60 return NULL;
61}
62
63static int snd_pcm_next(struct snd_card *card, int device)
64{
65 struct snd_pcm *pcm;
66
67 list_for_each_entry(pcm, &snd_pcm_devices, list) {
68 if (pcm->card == card && pcm->device > device)
69 return pcm->device;
70 else if (pcm->card->number > card->number)
71 return -1;
72 }
73 return -1;
74}
75
76static int snd_pcm_add(struct snd_pcm *newpcm)
77{
78 struct snd_pcm *pcm;
79
80 if (newpcm->internal)
81 return 0;
82
83 list_for_each_entry(pcm, &snd_pcm_devices, list) {
84 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
85 return -EBUSY;
86 if (pcm->card->number > newpcm->card->number ||
87 (pcm->card == newpcm->card &&
88 pcm->device > newpcm->device)) {
89 list_add(&newpcm->list, pcm->list.prev);
90 return 0;
91 }
92 }
93 list_add_tail(&newpcm->list, &snd_pcm_devices);
94 return 0;
95}
96
97static int snd_pcm_control_ioctl(struct snd_card *card,
98 struct snd_ctl_file *control,
99 unsigned int cmd, unsigned long arg)
100{
101 switch (cmd) {
102 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
103 {
104 int device;
105
106 if (get_user(device, (int __user *)arg))
107 return -EFAULT;
108 mutex_lock(®ister_mutex);
109 device = snd_pcm_next(card, device);
110 mutex_unlock(®ister_mutex);
111 if (put_user(device, (int __user *)arg))
112 return -EFAULT;
113 return 0;
114 }
115 case SNDRV_CTL_IOCTL_PCM_INFO:
116 {
117 struct snd_pcm_info __user *info;
118 unsigned int device, subdevice;
119 int stream;
120 struct snd_pcm *pcm;
121 struct snd_pcm_str *pstr;
122 struct snd_pcm_substream *substream;
123 int err;
124
125 info = (struct snd_pcm_info __user *)arg;
126 if (get_user(device, &info->device))
127 return -EFAULT;
128 if (get_user(stream, &info->stream))
129 return -EFAULT;
130 if (stream < 0 || stream > 1)
131 return -EINVAL;
132 if (get_user(subdevice, &info->subdevice))
133 return -EFAULT;
134 mutex_lock(®ister_mutex);
135 pcm = snd_pcm_get(card, device);
136 if (pcm == NULL) {
137 err = -ENXIO;
138 goto _error;
139 }
140 pstr = &pcm->streams[stream];
141 if (pstr->substream_count == 0) {
142 err = -ENOENT;
143 goto _error;
144 }
145 if (subdevice >= pstr->substream_count) {
146 err = -ENXIO;
147 goto _error;
148 }
149 for (substream = pstr->substream; substream;
150 substream = substream->next)
151 if (substream->number == (int)subdevice)
152 break;
153 if (substream == NULL) {
154 err = -ENXIO;
155 goto _error;
156 }
157 mutex_lock(&pcm->open_mutex);
158 err = snd_pcm_info_user(substream, info);
159 mutex_unlock(&pcm->open_mutex);
160 _error:
161 mutex_unlock(®ister_mutex);
162 return err;
163 }
164 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
165 {
166 int val;
167
168 if (get_user(val, (int __user *)arg))
169 return -EFAULT;
170 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
171 return 0;
172 }
173 }
174 return -ENOIOCTLCMD;
175}
176
177#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
178
179static char *snd_pcm_format_names[] = {
180 FORMAT(S8),
181 FORMAT(U8),
182 FORMAT(S16_LE),
183 FORMAT(S16_BE),
184 FORMAT(U16_LE),
185 FORMAT(U16_BE),
186 FORMAT(S24_LE),
187 FORMAT(S24_BE),
188 FORMAT(U24_LE),
189 FORMAT(U24_BE),
190 FORMAT(S32_LE),
191 FORMAT(S32_BE),
192 FORMAT(U32_LE),
193 FORMAT(U32_BE),
194 FORMAT(FLOAT_LE),
195 FORMAT(FLOAT_BE),
196 FORMAT(FLOAT64_LE),
197 FORMAT(FLOAT64_BE),
198 FORMAT(IEC958_SUBFRAME_LE),
199 FORMAT(IEC958_SUBFRAME_BE),
200 FORMAT(MU_LAW),
201 FORMAT(A_LAW),
202 FORMAT(IMA_ADPCM),
203 FORMAT(MPEG),
204 FORMAT(GSM),
205 FORMAT(SPECIAL),
206 FORMAT(S24_3LE),
207 FORMAT(S24_3BE),
208 FORMAT(U24_3LE),
209 FORMAT(U24_3BE),
210 FORMAT(S20_3LE),
211 FORMAT(S20_3BE),
212 FORMAT(U20_3LE),
213 FORMAT(U20_3BE),
214 FORMAT(S18_3LE),
215 FORMAT(S18_3BE),
216 FORMAT(U18_3LE),
217 FORMAT(U18_3BE),
218 FORMAT(G723_24),
219 FORMAT(G723_24_1B),
220 FORMAT(G723_40),
221 FORMAT(G723_40_1B),
222 FORMAT(DSD_U8),
223 FORMAT(DSD_U16_LE),
224 FORMAT(DSD_U32_LE),
225 FORMAT(DSD_U16_BE),
226 FORMAT(DSD_U32_BE),
227};
228
229/**
230 * snd_pcm_format_name - Return a name string for the given PCM format
231 * @format: PCM format
232 */
233const char *snd_pcm_format_name(snd_pcm_format_t format)
234{
235 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
236 return "Unknown";
237 return snd_pcm_format_names[(__force unsigned int)format];
238}
239EXPORT_SYMBOL_GPL(snd_pcm_format_name);
240
241#ifdef CONFIG_SND_VERBOSE_PROCFS
242
243#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
244#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
245#define READY(v) [SNDRV_PCM_READY_##v] = #v
246#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
247#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
248#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
249#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
250#define START(v) [SNDRV_PCM_START_##v] = #v
251#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
252
253static char *snd_pcm_stream_names[] = {
254 STREAM(PLAYBACK),
255 STREAM(CAPTURE),
256};
257
258static char *snd_pcm_state_names[] = {
259 STATE(OPEN),
260 STATE(SETUP),
261 STATE(PREPARED),
262 STATE(RUNNING),
263 STATE(XRUN),
264 STATE(DRAINING),
265 STATE(PAUSED),
266 STATE(SUSPENDED),
267};
268
269static char *snd_pcm_access_names[] = {
270 ACCESS(MMAP_INTERLEAVED),
271 ACCESS(MMAP_NONINTERLEAVED),
272 ACCESS(MMAP_COMPLEX),
273 ACCESS(RW_INTERLEAVED),
274 ACCESS(RW_NONINTERLEAVED),
275};
276
277static char *snd_pcm_subformat_names[] = {
278 SUBFORMAT(STD),
279};
280
281static char *snd_pcm_tstamp_mode_names[] = {
282 TSTAMP(NONE),
283 TSTAMP(ENABLE),
284};
285
286static const char *snd_pcm_stream_name(int stream)
287{
288 return snd_pcm_stream_names[stream];
289}
290
291static const char *snd_pcm_access_name(snd_pcm_access_t access)
292{
293 return snd_pcm_access_names[(__force int)access];
294}
295
296static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
297{
298 return snd_pcm_subformat_names[(__force int)subformat];
299}
300
301static const char *snd_pcm_tstamp_mode_name(int mode)
302{
303 return snd_pcm_tstamp_mode_names[mode];
304}
305
306static const char *snd_pcm_state_name(snd_pcm_state_t state)
307{
308 return snd_pcm_state_names[(__force int)state];
309}
310
311#if IS_ENABLED(CONFIG_SND_PCM_OSS)
312#include <linux/soundcard.h>
313
314static const char *snd_pcm_oss_format_name(int format)
315{
316 switch (format) {
317 case AFMT_MU_LAW:
318 return "MU_LAW";
319 case AFMT_A_LAW:
320 return "A_LAW";
321 case AFMT_IMA_ADPCM:
322 return "IMA_ADPCM";
323 case AFMT_U8:
324 return "U8";
325 case AFMT_S16_LE:
326 return "S16_LE";
327 case AFMT_S16_BE:
328 return "S16_BE";
329 case AFMT_S8:
330 return "S8";
331 case AFMT_U16_LE:
332 return "U16_LE";
333 case AFMT_U16_BE:
334 return "U16_BE";
335 case AFMT_MPEG:
336 return "MPEG";
337 default:
338 return "unknown";
339 }
340}
341#endif
342
343static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
344 struct snd_info_buffer *buffer)
345{
346 struct snd_pcm_info *info;
347 int err;
348
349 if (! substream)
350 return;
351
352 info = kmalloc(sizeof(*info), GFP_KERNEL);
353 if (!info)
354 return;
355
356 err = snd_pcm_info(substream, info);
357 if (err < 0) {
358 snd_iprintf(buffer, "error %d\n", err);
359 kfree(info);
360 return;
361 }
362 snd_iprintf(buffer, "card: %d\n", info->card);
363 snd_iprintf(buffer, "device: %d\n", info->device);
364 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
365 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
366 snd_iprintf(buffer, "id: %s\n", info->id);
367 snd_iprintf(buffer, "name: %s\n", info->name);
368 snd_iprintf(buffer, "subname: %s\n", info->subname);
369 snd_iprintf(buffer, "class: %d\n", info->dev_class);
370 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
371 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
372 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
373 kfree(info);
374}
375
376static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
378{
379 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
380 buffer);
381}
382
383static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
384 struct snd_info_buffer *buffer)
385{
386 snd_pcm_proc_info_read(entry->private_data, buffer);
387}
388
389static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
390 struct snd_info_buffer *buffer)
391{
392 struct snd_pcm_substream *substream = entry->private_data;
393 struct snd_pcm_runtime *runtime;
394
395 mutex_lock(&substream->pcm->open_mutex);
396 runtime = substream->runtime;
397 if (!runtime) {
398 snd_iprintf(buffer, "closed\n");
399 goto unlock;
400 }
401 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
402 snd_iprintf(buffer, "no setup\n");
403 goto unlock;
404 }
405 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
406 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
407 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
408 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
409 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
410 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
411 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
412#if IS_ENABLED(CONFIG_SND_PCM_OSS)
413 if (substream->oss.oss) {
414 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
415 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
416 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
417 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
418 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
419 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
420 }
421#endif
422 unlock:
423 mutex_unlock(&substream->pcm->open_mutex);
424}
425
426static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
427 struct snd_info_buffer *buffer)
428{
429 struct snd_pcm_substream *substream = entry->private_data;
430 struct snd_pcm_runtime *runtime;
431
432 mutex_lock(&substream->pcm->open_mutex);
433 runtime = substream->runtime;
434 if (!runtime) {
435 snd_iprintf(buffer, "closed\n");
436 goto unlock;
437 }
438 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
439 snd_iprintf(buffer, "no setup\n");
440 goto unlock;
441 }
442 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
443 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
444 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
445 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
446 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
447 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
448 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
449 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
450 unlock:
451 mutex_unlock(&substream->pcm->open_mutex);
452}
453
454static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
455 struct snd_info_buffer *buffer)
456{
457 struct snd_pcm_substream *substream = entry->private_data;
458 struct snd_pcm_runtime *runtime;
459 struct snd_pcm_status status;
460 int err;
461
462 mutex_lock(&substream->pcm->open_mutex);
463 runtime = substream->runtime;
464 if (!runtime) {
465 snd_iprintf(buffer, "closed\n");
466 goto unlock;
467 }
468 memset(&status, 0, sizeof(status));
469 err = snd_pcm_status(substream, &status);
470 if (err < 0) {
471 snd_iprintf(buffer, "error %d\n", err);
472 goto unlock;
473 }
474 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
475 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
476 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
477 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
478 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
479 status.tstamp.tv_sec, status.tstamp.tv_nsec);
480 snd_iprintf(buffer, "delay : %ld\n", status.delay);
481 snd_iprintf(buffer, "avail : %ld\n", status.avail);
482 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
483 snd_iprintf(buffer, "-----\n");
484 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
485 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
486 unlock:
487 mutex_unlock(&substream->pcm->open_mutex);
488}
489
490#ifdef CONFIG_SND_PCM_XRUN_DEBUG
491static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
492 struct snd_info_buffer *buffer)
493{
494 struct snd_pcm_substream *substream = entry->private_data;
495 struct snd_pcm_runtime *runtime;
496
497 snd_pcm_stream_lock_irq(substream);
498 runtime = substream->runtime;
499 if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
500 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
501 snd_pcm_stream_unlock_irq(substream);
502}
503
504static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
505 struct snd_info_buffer *buffer)
506{
507 struct snd_pcm_str *pstr = entry->private_data;
508 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
509}
510
511static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
512 struct snd_info_buffer *buffer)
513{
514 struct snd_pcm_str *pstr = entry->private_data;
515 char line[64];
516 if (!snd_info_get_line(buffer, line, sizeof(line)))
517 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
518}
519#endif
520
521static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
522{
523 struct snd_pcm *pcm = pstr->pcm;
524 struct snd_info_entry *entry;
525 char name[16];
526
527 sprintf(name, "pcm%i%c", pcm->device,
528 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
529 entry = snd_info_create_card_entry(pcm->card, name,
530 pcm->card->proc_root);
531 if (!entry)
532 return -ENOMEM;
533 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
534 if (snd_info_register(entry) < 0) {
535 snd_info_free_entry(entry);
536 return -ENOMEM;
537 }
538 pstr->proc_root = entry;
539 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
540 if (entry) {
541 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
542 if (snd_info_register(entry) < 0) {
543 snd_info_free_entry(entry);
544 entry = NULL;
545 }
546 }
547 pstr->proc_info_entry = entry;
548
549#ifdef CONFIG_SND_PCM_XRUN_DEBUG
550 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
551 pstr->proc_root);
552 if (entry) {
553 entry->c.text.read = snd_pcm_xrun_debug_read;
554 entry->c.text.write = snd_pcm_xrun_debug_write;
555 entry->mode |= S_IWUSR;
556 entry->private_data = pstr;
557 if (snd_info_register(entry) < 0) {
558 snd_info_free_entry(entry);
559 entry = NULL;
560 }
561 }
562 pstr->proc_xrun_debug_entry = entry;
563#endif
564 return 0;
565}
566
567static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
568{
569#ifdef CONFIG_SND_PCM_XRUN_DEBUG
570 snd_info_free_entry(pstr->proc_xrun_debug_entry);
571 pstr->proc_xrun_debug_entry = NULL;
572#endif
573 snd_info_free_entry(pstr->proc_info_entry);
574 pstr->proc_info_entry = NULL;
575 snd_info_free_entry(pstr->proc_root);
576 pstr->proc_root = NULL;
577 return 0;
578}
579
580static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
581{
582 struct snd_info_entry *entry;
583 struct snd_card *card;
584 char name[16];
585
586 card = substream->pcm->card;
587
588 sprintf(name, "sub%i", substream->number);
589 entry = snd_info_create_card_entry(card, name,
590 substream->pstr->proc_root);
591 if (!entry)
592 return -ENOMEM;
593 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
594 if (snd_info_register(entry) < 0) {
595 snd_info_free_entry(entry);
596 return -ENOMEM;
597 }
598 substream->proc_root = entry;
599 entry = snd_info_create_card_entry(card, "info", substream->proc_root);
600 if (entry) {
601 snd_info_set_text_ops(entry, substream,
602 snd_pcm_substream_proc_info_read);
603 if (snd_info_register(entry) < 0) {
604 snd_info_free_entry(entry);
605 entry = NULL;
606 }
607 }
608 substream->proc_info_entry = entry;
609 entry = snd_info_create_card_entry(card, "hw_params",
610 substream->proc_root);
611 if (entry) {
612 snd_info_set_text_ops(entry, substream,
613 snd_pcm_substream_proc_hw_params_read);
614 if (snd_info_register(entry) < 0) {
615 snd_info_free_entry(entry);
616 entry = NULL;
617 }
618 }
619 substream->proc_hw_params_entry = entry;
620 entry = snd_info_create_card_entry(card, "sw_params",
621 substream->proc_root);
622 if (entry) {
623 snd_info_set_text_ops(entry, substream,
624 snd_pcm_substream_proc_sw_params_read);
625 if (snd_info_register(entry) < 0) {
626 snd_info_free_entry(entry);
627 entry = NULL;
628 }
629 }
630 substream->proc_sw_params_entry = entry;
631 entry = snd_info_create_card_entry(card, "status",
632 substream->proc_root);
633 if (entry) {
634 snd_info_set_text_ops(entry, substream,
635 snd_pcm_substream_proc_status_read);
636 if (snd_info_register(entry) < 0) {
637 snd_info_free_entry(entry);
638 entry = NULL;
639 }
640 }
641 substream->proc_status_entry = entry;
642
643#ifdef CONFIG_SND_PCM_XRUN_DEBUG
644 entry = snd_info_create_card_entry(card, "xrun_injection",
645 substream->proc_root);
646 if (entry) {
647 entry->private_data = substream;
648 entry->c.text.read = NULL;
649 entry->c.text.write = snd_pcm_xrun_injection_write;
650 entry->mode = S_IFREG | S_IWUSR;
651 if (snd_info_register(entry) < 0) {
652 snd_info_free_entry(entry);
653 entry = NULL;
654 }
655 }
656 substream->proc_xrun_injection_entry = entry;
657#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
658
659 return 0;
660}
661
662static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
663{
664 snd_info_free_entry(substream->proc_info_entry);
665 substream->proc_info_entry = NULL;
666 snd_info_free_entry(substream->proc_hw_params_entry);
667 substream->proc_hw_params_entry = NULL;
668 snd_info_free_entry(substream->proc_sw_params_entry);
669 substream->proc_sw_params_entry = NULL;
670 snd_info_free_entry(substream->proc_status_entry);
671 substream->proc_status_entry = NULL;
672#ifdef CONFIG_SND_PCM_XRUN_DEBUG
673 snd_info_free_entry(substream->proc_xrun_injection_entry);
674 substream->proc_xrun_injection_entry = NULL;
675#endif
676 snd_info_free_entry(substream->proc_root);
677 substream->proc_root = NULL;
678 return 0;
679}
680#else /* !CONFIG_SND_VERBOSE_PROCFS */
681static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
682static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
683static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
684static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
685#endif /* CONFIG_SND_VERBOSE_PROCFS */
686
687static const struct attribute_group *pcm_dev_attr_groups[];
688
689/**
690 * snd_pcm_new_stream - create a new PCM stream
691 * @pcm: the pcm instance
692 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
693 * @substream_count: the number of substreams
694 *
695 * Creates a new stream for the pcm.
696 * The corresponding stream on the pcm must have been empty before
697 * calling this, i.e. zero must be given to the argument of
698 * snd_pcm_new().
699 *
700 * Return: Zero if successful, or a negative error code on failure.
701 */
702int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
703{
704 int idx, err;
705 struct snd_pcm_str *pstr = &pcm->streams[stream];
706 struct snd_pcm_substream *substream, *prev;
707
708#if IS_ENABLED(CONFIG_SND_PCM_OSS)
709 mutex_init(&pstr->oss.setup_mutex);
710#endif
711 pstr->stream = stream;
712 pstr->pcm = pcm;
713 pstr->substream_count = substream_count;
714 if (!substream_count)
715 return 0;
716
717 snd_device_initialize(&pstr->dev, pcm->card);
718 pstr->dev.groups = pcm_dev_attr_groups;
719 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
720 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
721
722 if (!pcm->internal) {
723 err = snd_pcm_stream_proc_init(pstr);
724 if (err < 0) {
725 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
726 return err;
727 }
728 }
729 prev = NULL;
730 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
731 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
732 if (!substream)
733 return -ENOMEM;
734 substream->pcm = pcm;
735 substream->pstr = pstr;
736 substream->number = idx;
737 substream->stream = stream;
738 sprintf(substream->name, "subdevice #%i", idx);
739 substream->buffer_bytes_max = UINT_MAX;
740 if (prev == NULL)
741 pstr->substream = substream;
742 else
743 prev->next = substream;
744
745 if (!pcm->internal) {
746 err = snd_pcm_substream_proc_init(substream);
747 if (err < 0) {
748 pcm_err(pcm,
749 "Error in snd_pcm_stream_proc_init\n");
750 if (prev == NULL)
751 pstr->substream = NULL;
752 else
753 prev->next = NULL;
754 kfree(substream);
755 return err;
756 }
757 }
758 substream->group = &substream->self_group;
759 spin_lock_init(&substream->self_group.lock);
760 mutex_init(&substream->self_group.mutex);
761 INIT_LIST_HEAD(&substream->self_group.substreams);
762 list_add_tail(&substream->link_list, &substream->self_group.substreams);
763 atomic_set(&substream->mmap_count, 0);
764 prev = substream;
765 }
766 return 0;
767}
768EXPORT_SYMBOL(snd_pcm_new_stream);
769
770static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
771 int playback_count, int capture_count, bool internal,
772 struct snd_pcm **rpcm)
773{
774 struct snd_pcm *pcm;
775 int err;
776 static struct snd_device_ops ops = {
777 .dev_free = snd_pcm_dev_free,
778 .dev_register = snd_pcm_dev_register,
779 .dev_disconnect = snd_pcm_dev_disconnect,
780 };
781 static struct snd_device_ops internal_ops = {
782 .dev_free = snd_pcm_dev_free,
783 };
784
785 if (snd_BUG_ON(!card))
786 return -ENXIO;
787 if (rpcm)
788 *rpcm = NULL;
789 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
790 if (!pcm)
791 return -ENOMEM;
792 pcm->card = card;
793 pcm->device = device;
794 pcm->internal = internal;
795 mutex_init(&pcm->open_mutex);
796 init_waitqueue_head(&pcm->open_wait);
797 INIT_LIST_HEAD(&pcm->list);
798 if (id)
799 strlcpy(pcm->id, id, sizeof(pcm->id));
800
801 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
802 playback_count);
803 if (err < 0)
804 goto free_pcm;
805
806 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
807 if (err < 0)
808 goto free_pcm;
809
810 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
811 internal ? &internal_ops : &ops);
812 if (err < 0)
813 goto free_pcm;
814
815 if (rpcm)
816 *rpcm = pcm;
817 return 0;
818
819free_pcm:
820 snd_pcm_free(pcm);
821 return err;
822}
823
824/**
825 * snd_pcm_new - create a new PCM instance
826 * @card: the card instance
827 * @id: the id string
828 * @device: the device index (zero based)
829 * @playback_count: the number of substreams for playback
830 * @capture_count: the number of substreams for capture
831 * @rpcm: the pointer to store the new pcm instance
832 *
833 * Creates a new PCM instance.
834 *
835 * The pcm operators have to be set afterwards to the new instance
836 * via snd_pcm_set_ops().
837 *
838 * Return: Zero if successful, or a negative error code on failure.
839 */
840int snd_pcm_new(struct snd_card *card, const char *id, int device,
841 int playback_count, int capture_count, struct snd_pcm **rpcm)
842{
843 return _snd_pcm_new(card, id, device, playback_count, capture_count,
844 false, rpcm);
845}
846EXPORT_SYMBOL(snd_pcm_new);
847
848/**
849 * snd_pcm_new_internal - create a new internal PCM instance
850 * @card: the card instance
851 * @id: the id string
852 * @device: the device index (zero based - shared with normal PCMs)
853 * @playback_count: the number of substreams for playback
854 * @capture_count: the number of substreams for capture
855 * @rpcm: the pointer to store the new pcm instance
856 *
857 * Creates a new internal PCM instance with no userspace device or procfs
858 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
859 * will only be used internally by kernel drivers. i.e. it cannot be opened
860 * by userspace. It provides existing ASoC components drivers with a substream
861 * and access to any private data.
862 *
863 * The pcm operators have to be set afterwards to the new instance
864 * via snd_pcm_set_ops().
865 *
866 * Return: Zero if successful, or a negative error code on failure.
867 */
868int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
869 int playback_count, int capture_count,
870 struct snd_pcm **rpcm)
871{
872 return _snd_pcm_new(card, id, device, playback_count, capture_count,
873 true, rpcm);
874}
875EXPORT_SYMBOL(snd_pcm_new_internal);
876
877static void free_chmap(struct snd_pcm_str *pstr)
878{
879 if (pstr->chmap_kctl) {
880 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
881 pstr->chmap_kctl = NULL;
882 }
883}
884
885static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
886{
887 struct snd_pcm_substream *substream, *substream_next;
888#if IS_ENABLED(CONFIG_SND_PCM_OSS)
889 struct snd_pcm_oss_setup *setup, *setupn;
890#endif
891 substream = pstr->substream;
892 while (substream) {
893 substream_next = substream->next;
894 snd_pcm_timer_done(substream);
895 snd_pcm_substream_proc_done(substream);
896 kfree(substream);
897 substream = substream_next;
898 }
899 snd_pcm_stream_proc_done(pstr);
900#if IS_ENABLED(CONFIG_SND_PCM_OSS)
901 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
902 setupn = setup->next;
903 kfree(setup->task_name);
904 kfree(setup);
905 }
906#endif
907 free_chmap(pstr);
908 if (pstr->substream_count)
909 put_device(&pstr->dev);
910}
911
912#if IS_ENABLED(CONFIG_SND_PCM_OSS)
913#define pcm_call_notify(pcm, call) \
914 do { \
915 struct snd_pcm_notify *_notify; \
916 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
917 _notify->call(pcm); \
918 } while (0)
919#else
920#define pcm_call_notify(pcm, call) do {} while (0)
921#endif
922
923static int snd_pcm_free(struct snd_pcm *pcm)
924{
925 if (!pcm)
926 return 0;
927 if (!pcm->internal)
928 pcm_call_notify(pcm, n_unregister);
929 if (pcm->private_free)
930 pcm->private_free(pcm);
931 snd_pcm_lib_preallocate_free_for_all(pcm);
932 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
933 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
934 kfree(pcm);
935 return 0;
936}
937
938static int snd_pcm_dev_free(struct snd_device *device)
939{
940 struct snd_pcm *pcm = device->device_data;
941 return snd_pcm_free(pcm);
942}
943
944int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
945 struct file *file,
946 struct snd_pcm_substream **rsubstream)
947{
948 struct snd_pcm_str * pstr;
949 struct snd_pcm_substream *substream;
950 struct snd_pcm_runtime *runtime;
951 struct snd_card *card;
952 int prefer_subdevice;
953 size_t size;
954
955 if (snd_BUG_ON(!pcm || !rsubstream))
956 return -ENXIO;
957 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
958 stream != SNDRV_PCM_STREAM_CAPTURE))
959 return -EINVAL;
960 *rsubstream = NULL;
961 pstr = &pcm->streams[stream];
962 if (pstr->substream == NULL || pstr->substream_count == 0)
963 return -ENODEV;
964
965 card = pcm->card;
966 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
967
968 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
969 int opposite = !stream;
970
971 for (substream = pcm->streams[opposite].substream; substream;
972 substream = substream->next) {
973 if (SUBSTREAM_BUSY(substream))
974 return -EAGAIN;
975 }
976 }
977
978 if (file->f_flags & O_APPEND) {
979 if (prefer_subdevice < 0) {
980 if (pstr->substream_count > 1)
981 return -EINVAL; /* must be unique */
982 substream = pstr->substream;
983 } else {
984 for (substream = pstr->substream; substream;
985 substream = substream->next)
986 if (substream->number == prefer_subdevice)
987 break;
988 }
989 if (! substream)
990 return -ENODEV;
991 if (! SUBSTREAM_BUSY(substream))
992 return -EBADFD;
993 substream->ref_count++;
994 *rsubstream = substream;
995 return 0;
996 }
997
998 for (substream = pstr->substream; substream; substream = substream->next) {
999 if (!SUBSTREAM_BUSY(substream) &&
1000 (prefer_subdevice == -1 ||
1001 substream->number == prefer_subdevice))
1002 break;
1003 }
1004 if (substream == NULL)
1005 return -EAGAIN;
1006
1007 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
1008 if (runtime == NULL)
1009 return -ENOMEM;
1010
1011 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
1012 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
1013 if (runtime->status == NULL) {
1014 kfree(runtime);
1015 return -ENOMEM;
1016 }
1017 memset((void*)runtime->status, 0, size);
1018
1019 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
1020 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
1021 if (runtime->control == NULL) {
1022 snd_free_pages((void*)runtime->status,
1023 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1024 kfree(runtime);
1025 return -ENOMEM;
1026 }
1027 memset((void*)runtime->control, 0, size);
1028
1029 init_waitqueue_head(&runtime->sleep);
1030 init_waitqueue_head(&runtime->tsleep);
1031
1032 runtime->status->state = SNDRV_PCM_STATE_OPEN;
1033
1034 substream->runtime = runtime;
1035 substream->private_data = pcm->private_data;
1036 substream->ref_count = 1;
1037 substream->f_flags = file->f_flags;
1038 substream->pid = get_pid(task_pid(current));
1039 pstr->substream_opened++;
1040 *rsubstream = substream;
1041 return 0;
1042}
1043
1044void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1045{
1046 struct snd_pcm_runtime *runtime;
1047
1048 if (PCM_RUNTIME_CHECK(substream))
1049 return;
1050 runtime = substream->runtime;
1051 if (runtime->private_free != NULL)
1052 runtime->private_free(runtime);
1053 snd_free_pages((void*)runtime->status,
1054 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1055 snd_free_pages((void*)runtime->control,
1056 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1057 kfree(runtime->hw_constraints.rules);
1058 /* Avoid concurrent access to runtime via PCM timer interface */
1059 if (substream->timer)
1060 spin_lock_irq(&substream->timer->lock);
1061 substream->runtime = NULL;
1062 if (substream->timer)
1063 spin_unlock_irq(&substream->timer->lock);
1064 kfree(runtime);
1065 put_pid(substream->pid);
1066 substream->pid = NULL;
1067 substream->pstr->substream_opened--;
1068}
1069
1070static ssize_t show_pcm_class(struct device *dev,
1071 struct device_attribute *attr, char *buf)
1072{
1073 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1074 struct snd_pcm *pcm = pstr->pcm;
1075 const char *str;
1076 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1077 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1078 [SNDRV_PCM_CLASS_MULTI] = "multi",
1079 [SNDRV_PCM_CLASS_MODEM] = "modem",
1080 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1081 };
1082
1083 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1084 str = "none";
1085 else
1086 str = strs[pcm->dev_class];
1087 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1088}
1089
1090static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1091static struct attribute *pcm_dev_attrs[] = {
1092 &dev_attr_pcm_class.attr,
1093 NULL
1094};
1095
1096static const struct attribute_group pcm_dev_attr_group = {
1097 .attrs = pcm_dev_attrs,
1098};
1099
1100static const struct attribute_group *pcm_dev_attr_groups[] = {
1101 &pcm_dev_attr_group,
1102 NULL
1103};
1104
1105static int snd_pcm_dev_register(struct snd_device *device)
1106{
1107 int cidx, err;
1108 struct snd_pcm_substream *substream;
1109 struct snd_pcm *pcm;
1110
1111 if (snd_BUG_ON(!device || !device->device_data))
1112 return -ENXIO;
1113 pcm = device->device_data;
1114
1115 mutex_lock(®ister_mutex);
1116 err = snd_pcm_add(pcm);
1117 if (err)
1118 goto unlock;
1119 for (cidx = 0; cidx < 2; cidx++) {
1120 int devtype = -1;
1121 if (pcm->streams[cidx].substream == NULL)
1122 continue;
1123 switch (cidx) {
1124 case SNDRV_PCM_STREAM_PLAYBACK:
1125 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1126 break;
1127 case SNDRV_PCM_STREAM_CAPTURE:
1128 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1129 break;
1130 }
1131 /* register pcm */
1132 err = snd_register_device(devtype, pcm->card, pcm->device,
1133 &snd_pcm_f_ops[cidx], pcm,
1134 &pcm->streams[cidx].dev);
1135 if (err < 0) {
1136 list_del_init(&pcm->list);
1137 goto unlock;
1138 }
1139
1140 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1141 snd_pcm_timer_init(substream);
1142 }
1143
1144 pcm_call_notify(pcm, n_register);
1145
1146 unlock:
1147 mutex_unlock(®ister_mutex);
1148 return err;
1149}
1150
1151static int snd_pcm_dev_disconnect(struct snd_device *device)
1152{
1153 struct snd_pcm *pcm = device->device_data;
1154 struct snd_pcm_substream *substream;
1155 int cidx;
1156
1157 mutex_lock(®ister_mutex);
1158 mutex_lock(&pcm->open_mutex);
1159 wake_up(&pcm->open_wait);
1160 list_del_init(&pcm->list);
1161 for (cidx = 0; cidx < 2; cidx++) {
1162 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1163 snd_pcm_stream_lock_irq(substream);
1164 if (substream->runtime) {
1165 if (snd_pcm_running(substream))
1166 snd_pcm_stop(substream,
1167 SNDRV_PCM_STATE_DISCONNECTED);
1168 /* to be sure, set the state unconditionally */
1169 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1170 wake_up(&substream->runtime->sleep);
1171 wake_up(&substream->runtime->tsleep);
1172 }
1173 snd_pcm_stream_unlock_irq(substream);
1174 }
1175 }
1176
1177 pcm_call_notify(pcm, n_disconnect);
1178 for (cidx = 0; cidx < 2; cidx++) {
1179 snd_unregister_device(&pcm->streams[cidx].dev);
1180 free_chmap(&pcm->streams[cidx]);
1181 }
1182 mutex_unlock(&pcm->open_mutex);
1183 mutex_unlock(®ister_mutex);
1184 return 0;
1185}
1186
1187#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1188/**
1189 * snd_pcm_notify - Add/remove the notify list
1190 * @notify: PCM notify list
1191 * @nfree: 0 = register, 1 = unregister
1192 *
1193 * This adds the given notifier to the global list so that the callback is
1194 * called for each registered PCM devices. This exists only for PCM OSS
1195 * emulation, so far.
1196 */
1197int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1198{
1199 struct snd_pcm *pcm;
1200
1201 if (snd_BUG_ON(!notify ||
1202 !notify->n_register ||
1203 !notify->n_unregister ||
1204 !notify->n_disconnect))
1205 return -EINVAL;
1206 mutex_lock(®ister_mutex);
1207 if (nfree) {
1208 list_del(¬ify->list);
1209 list_for_each_entry(pcm, &snd_pcm_devices, list)
1210 notify->n_unregister(pcm);
1211 } else {
1212 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1213 list_for_each_entry(pcm, &snd_pcm_devices, list)
1214 notify->n_register(pcm);
1215 }
1216 mutex_unlock(®ister_mutex);
1217 return 0;
1218}
1219EXPORT_SYMBOL(snd_pcm_notify);
1220#endif /* CONFIG_SND_PCM_OSS */
1221
1222#ifdef CONFIG_SND_PROC_FS
1223/*
1224 * Info interface
1225 */
1226
1227static void snd_pcm_proc_read(struct snd_info_entry *entry,
1228 struct snd_info_buffer *buffer)
1229{
1230 struct snd_pcm *pcm;
1231
1232 mutex_lock(®ister_mutex);
1233 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1234 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1235 pcm->card->number, pcm->device, pcm->id, pcm->name);
1236 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1237 snd_iprintf(buffer, " : playback %i",
1238 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1239 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1240 snd_iprintf(buffer, " : capture %i",
1241 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1242 snd_iprintf(buffer, "\n");
1243 }
1244 mutex_unlock(®ister_mutex);
1245}
1246
1247static struct snd_info_entry *snd_pcm_proc_entry;
1248
1249static void snd_pcm_proc_init(void)
1250{
1251 struct snd_info_entry *entry;
1252
1253 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1254 if (entry) {
1255 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1256 if (snd_info_register(entry) < 0) {
1257 snd_info_free_entry(entry);
1258 entry = NULL;
1259 }
1260 }
1261 snd_pcm_proc_entry = entry;
1262}
1263
1264static void snd_pcm_proc_done(void)
1265{
1266 snd_info_free_entry(snd_pcm_proc_entry);
1267}
1268
1269#else /* !CONFIG_SND_PROC_FS */
1270#define snd_pcm_proc_init()
1271#define snd_pcm_proc_done()
1272#endif /* CONFIG_SND_PROC_FS */
1273
1274
1275/*
1276 * ENTRY functions
1277 */
1278
1279static int __init alsa_pcm_init(void)
1280{
1281 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1282 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1283 snd_pcm_proc_init();
1284 return 0;
1285}
1286
1287static void __exit alsa_pcm_exit(void)
1288{
1289 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1290 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1291 snd_pcm_proc_done();
1292}
1293
1294module_init(alsa_pcm_init)
1295module_exit(alsa_pcm_exit)