This source file includes following definitions.
- snd_pcm_get
- snd_pcm_next
- snd_pcm_add
- snd_pcm_control_ioctl
- snd_pcm_format_name
- snd_pcm_stream_name
- snd_pcm_access_name
- snd_pcm_subformat_name
- snd_pcm_tstamp_mode_name
- snd_pcm_state_name
- snd_pcm_oss_format_name
- snd_pcm_proc_info_read
- snd_pcm_stream_proc_info_read
- snd_pcm_substream_proc_info_read
- snd_pcm_substream_proc_hw_params_read
- snd_pcm_substream_proc_sw_params_read
- snd_pcm_substream_proc_status_read
- snd_pcm_xrun_injection_write
- snd_pcm_xrun_debug_read
- snd_pcm_xrun_debug_write
- snd_pcm_stream_proc_init
- snd_pcm_stream_proc_done
- create_substream_info_entry
- snd_pcm_substream_proc_init
- snd_pcm_stream_proc_init
- snd_pcm_stream_proc_done
- snd_pcm_substream_proc_init
- do_pcm_suspend
- snd_pcm_new_stream
- _snd_pcm_new
- snd_pcm_new
- snd_pcm_new_internal
- free_chmap
- snd_pcm_free_stream
- snd_pcm_free
- snd_pcm_dev_free
- snd_pcm_attach_substream
- snd_pcm_detach_substream
- show_pcm_class
- snd_pcm_dev_register
- snd_pcm_dev_disconnect
- snd_pcm_notify
- snd_pcm_proc_read
- snd_pcm_proc_init
- snd_pcm_proc_done
- alsa_pcm_init
- alsa_pcm_exit
1
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3
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5
6
7 #include <linux/init.h>
8 #include <linux/slab.h>
9 #include <linux/module.h>
10 #include <linux/time.h>
11 #include <linux/mutex.h>
12 #include <linux/device.h>
13 #include <linux/nospec.h>
14 #include <sound/core.h>
15 #include <sound/minors.h>
16 #include <sound/pcm.h>
17 #include <sound/timer.h>
18 #include <sound/control.h>
19 #include <sound/info.h>
20
21 #include "pcm_local.h"
22
23 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
24 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
25 MODULE_LICENSE("GPL");
26
27 static LIST_HEAD(snd_pcm_devices);
28 static DEFINE_MUTEX(register_mutex);
29 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
30 static LIST_HEAD(snd_pcm_notify_list);
31 #endif
32
33 static int snd_pcm_free(struct snd_pcm *pcm);
34 static int snd_pcm_dev_free(struct snd_device *device);
35 static int snd_pcm_dev_register(struct snd_device *device);
36 static int snd_pcm_dev_disconnect(struct snd_device *device);
37
38 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
39 {
40 struct snd_pcm *pcm;
41
42 list_for_each_entry(pcm, &snd_pcm_devices, list) {
43 if (pcm->card == card && pcm->device == device)
44 return pcm;
45 }
46 return NULL;
47 }
48
49 static int snd_pcm_next(struct snd_card *card, int device)
50 {
51 struct snd_pcm *pcm;
52
53 list_for_each_entry(pcm, &snd_pcm_devices, list) {
54 if (pcm->card == card && pcm->device > device)
55 return pcm->device;
56 else if (pcm->card->number > card->number)
57 return -1;
58 }
59 return -1;
60 }
61
62 static int snd_pcm_add(struct snd_pcm *newpcm)
63 {
64 struct snd_pcm *pcm;
65
66 if (newpcm->internal)
67 return 0;
68
69 list_for_each_entry(pcm, &snd_pcm_devices, list) {
70 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
71 return -EBUSY;
72 if (pcm->card->number > newpcm->card->number ||
73 (pcm->card == newpcm->card &&
74 pcm->device > newpcm->device)) {
75 list_add(&newpcm->list, pcm->list.prev);
76 return 0;
77 }
78 }
79 list_add_tail(&newpcm->list, &snd_pcm_devices);
80 return 0;
81 }
82
83 static int snd_pcm_control_ioctl(struct snd_card *card,
84 struct snd_ctl_file *control,
85 unsigned int cmd, unsigned long arg)
86 {
87 switch (cmd) {
88 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
89 {
90 int device;
91
92 if (get_user(device, (int __user *)arg))
93 return -EFAULT;
94 mutex_lock(®ister_mutex);
95 device = snd_pcm_next(card, device);
96 mutex_unlock(®ister_mutex);
97 if (put_user(device, (int __user *)arg))
98 return -EFAULT;
99 return 0;
100 }
101 case SNDRV_CTL_IOCTL_PCM_INFO:
102 {
103 struct snd_pcm_info __user *info;
104 unsigned int device, subdevice;
105 int stream;
106 struct snd_pcm *pcm;
107 struct snd_pcm_str *pstr;
108 struct snd_pcm_substream *substream;
109 int err;
110
111 info = (struct snd_pcm_info __user *)arg;
112 if (get_user(device, &info->device))
113 return -EFAULT;
114 if (get_user(stream, &info->stream))
115 return -EFAULT;
116 if (stream < 0 || stream > 1)
117 return -EINVAL;
118 stream = array_index_nospec(stream, 2);
119 if (get_user(subdevice, &info->subdevice))
120 return -EFAULT;
121 mutex_lock(®ister_mutex);
122 pcm = snd_pcm_get(card, device);
123 if (pcm == NULL) {
124 err = -ENXIO;
125 goto _error;
126 }
127 pstr = &pcm->streams[stream];
128 if (pstr->substream_count == 0) {
129 err = -ENOENT;
130 goto _error;
131 }
132 if (subdevice >= pstr->substream_count) {
133 err = -ENXIO;
134 goto _error;
135 }
136 for (substream = pstr->substream; substream;
137 substream = substream->next)
138 if (substream->number == (int)subdevice)
139 break;
140 if (substream == NULL) {
141 err = -ENXIO;
142 goto _error;
143 }
144 mutex_lock(&pcm->open_mutex);
145 err = snd_pcm_info_user(substream, info);
146 mutex_unlock(&pcm->open_mutex);
147 _error:
148 mutex_unlock(®ister_mutex);
149 return err;
150 }
151 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
152 {
153 int val;
154
155 if (get_user(val, (int __user *)arg))
156 return -EFAULT;
157 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
158 return 0;
159 }
160 }
161 return -ENOIOCTLCMD;
162 }
163
164 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
165
166 static char *snd_pcm_format_names[] = {
167 FORMAT(S8),
168 FORMAT(U8),
169 FORMAT(S16_LE),
170 FORMAT(S16_BE),
171 FORMAT(U16_LE),
172 FORMAT(U16_BE),
173 FORMAT(S24_LE),
174 FORMAT(S24_BE),
175 FORMAT(U24_LE),
176 FORMAT(U24_BE),
177 FORMAT(S32_LE),
178 FORMAT(S32_BE),
179 FORMAT(U32_LE),
180 FORMAT(U32_BE),
181 FORMAT(FLOAT_LE),
182 FORMAT(FLOAT_BE),
183 FORMAT(FLOAT64_LE),
184 FORMAT(FLOAT64_BE),
185 FORMAT(IEC958_SUBFRAME_LE),
186 FORMAT(IEC958_SUBFRAME_BE),
187 FORMAT(MU_LAW),
188 FORMAT(A_LAW),
189 FORMAT(IMA_ADPCM),
190 FORMAT(MPEG),
191 FORMAT(GSM),
192 FORMAT(SPECIAL),
193 FORMAT(S24_3LE),
194 FORMAT(S24_3BE),
195 FORMAT(U24_3LE),
196 FORMAT(U24_3BE),
197 FORMAT(S20_3LE),
198 FORMAT(S20_3BE),
199 FORMAT(U20_3LE),
200 FORMAT(U20_3BE),
201 FORMAT(S18_3LE),
202 FORMAT(S18_3BE),
203 FORMAT(U18_3LE),
204 FORMAT(U18_3BE),
205 FORMAT(G723_24),
206 FORMAT(G723_24_1B),
207 FORMAT(G723_40),
208 FORMAT(G723_40_1B),
209 FORMAT(DSD_U8),
210 FORMAT(DSD_U16_LE),
211 FORMAT(DSD_U32_LE),
212 FORMAT(DSD_U16_BE),
213 FORMAT(DSD_U32_BE),
214 };
215
216
217
218
219
220 const char *snd_pcm_format_name(snd_pcm_format_t format)
221 {
222 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
223 return "Unknown";
224 return snd_pcm_format_names[(__force unsigned int)format];
225 }
226 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
227
228 #ifdef CONFIG_SND_VERBOSE_PROCFS
229
230 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
231 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
232 #define READY(v) [SNDRV_PCM_READY_##v] = #v
233 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
234 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
235 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
236 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
237 #define START(v) [SNDRV_PCM_START_##v] = #v
238 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
239
240 static char *snd_pcm_stream_names[] = {
241 STREAM(PLAYBACK),
242 STREAM(CAPTURE),
243 };
244
245 static char *snd_pcm_state_names[] = {
246 STATE(OPEN),
247 STATE(SETUP),
248 STATE(PREPARED),
249 STATE(RUNNING),
250 STATE(XRUN),
251 STATE(DRAINING),
252 STATE(PAUSED),
253 STATE(SUSPENDED),
254 };
255
256 static char *snd_pcm_access_names[] = {
257 ACCESS(MMAP_INTERLEAVED),
258 ACCESS(MMAP_NONINTERLEAVED),
259 ACCESS(MMAP_COMPLEX),
260 ACCESS(RW_INTERLEAVED),
261 ACCESS(RW_NONINTERLEAVED),
262 };
263
264 static char *snd_pcm_subformat_names[] = {
265 SUBFORMAT(STD),
266 };
267
268 static char *snd_pcm_tstamp_mode_names[] = {
269 TSTAMP(NONE),
270 TSTAMP(ENABLE),
271 };
272
273 static const char *snd_pcm_stream_name(int stream)
274 {
275 return snd_pcm_stream_names[stream];
276 }
277
278 static const char *snd_pcm_access_name(snd_pcm_access_t access)
279 {
280 return snd_pcm_access_names[(__force int)access];
281 }
282
283 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
284 {
285 return snd_pcm_subformat_names[(__force int)subformat];
286 }
287
288 static const char *snd_pcm_tstamp_mode_name(int mode)
289 {
290 return snd_pcm_tstamp_mode_names[mode];
291 }
292
293 static const char *snd_pcm_state_name(snd_pcm_state_t state)
294 {
295 return snd_pcm_state_names[(__force int)state];
296 }
297
298 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
299 #include <linux/soundcard.h>
300
301 static const char *snd_pcm_oss_format_name(int format)
302 {
303 switch (format) {
304 case AFMT_MU_LAW:
305 return "MU_LAW";
306 case AFMT_A_LAW:
307 return "A_LAW";
308 case AFMT_IMA_ADPCM:
309 return "IMA_ADPCM";
310 case AFMT_U8:
311 return "U8";
312 case AFMT_S16_LE:
313 return "S16_LE";
314 case AFMT_S16_BE:
315 return "S16_BE";
316 case AFMT_S8:
317 return "S8";
318 case AFMT_U16_LE:
319 return "U16_LE";
320 case AFMT_U16_BE:
321 return "U16_BE";
322 case AFMT_MPEG:
323 return "MPEG";
324 default:
325 return "unknown";
326 }
327 }
328 #endif
329
330 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
331 struct snd_info_buffer *buffer)
332 {
333 struct snd_pcm_info *info;
334 int err;
335
336 if (! substream)
337 return;
338
339 info = kmalloc(sizeof(*info), GFP_KERNEL);
340 if (!info)
341 return;
342
343 err = snd_pcm_info(substream, info);
344 if (err < 0) {
345 snd_iprintf(buffer, "error %d\n", err);
346 kfree(info);
347 return;
348 }
349 snd_iprintf(buffer, "card: %d\n", info->card);
350 snd_iprintf(buffer, "device: %d\n", info->device);
351 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
352 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
353 snd_iprintf(buffer, "id: %s\n", info->id);
354 snd_iprintf(buffer, "name: %s\n", info->name);
355 snd_iprintf(buffer, "subname: %s\n", info->subname);
356 snd_iprintf(buffer, "class: %d\n", info->dev_class);
357 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
358 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
359 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
360 kfree(info);
361 }
362
363 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
364 struct snd_info_buffer *buffer)
365 {
366 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
367 buffer);
368 }
369
370 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
371 struct snd_info_buffer *buffer)
372 {
373 snd_pcm_proc_info_read(entry->private_data, buffer);
374 }
375
376 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
378 {
379 struct snd_pcm_substream *substream = entry->private_data;
380 struct snd_pcm_runtime *runtime;
381
382 mutex_lock(&substream->pcm->open_mutex);
383 runtime = substream->runtime;
384 if (!runtime) {
385 snd_iprintf(buffer, "closed\n");
386 goto unlock;
387 }
388 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
389 snd_iprintf(buffer, "no setup\n");
390 goto unlock;
391 }
392 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
393 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
394 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
395 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
396 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
397 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
398 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
399 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
400 if (substream->oss.oss) {
401 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
402 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
403 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
404 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
405 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
406 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
407 }
408 #endif
409 unlock:
410 mutex_unlock(&substream->pcm->open_mutex);
411 }
412
413 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
414 struct snd_info_buffer *buffer)
415 {
416 struct snd_pcm_substream *substream = entry->private_data;
417 struct snd_pcm_runtime *runtime;
418
419 mutex_lock(&substream->pcm->open_mutex);
420 runtime = substream->runtime;
421 if (!runtime) {
422 snd_iprintf(buffer, "closed\n");
423 goto unlock;
424 }
425 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
426 snd_iprintf(buffer, "no setup\n");
427 goto unlock;
428 }
429 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
430 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
431 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
432 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
433 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
434 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
435 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
436 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
437 unlock:
438 mutex_unlock(&substream->pcm->open_mutex);
439 }
440
441 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
442 struct snd_info_buffer *buffer)
443 {
444 struct snd_pcm_substream *substream = entry->private_data;
445 struct snd_pcm_runtime *runtime;
446 struct snd_pcm_status status;
447 int err;
448
449 mutex_lock(&substream->pcm->open_mutex);
450 runtime = substream->runtime;
451 if (!runtime) {
452 snd_iprintf(buffer, "closed\n");
453 goto unlock;
454 }
455 memset(&status, 0, sizeof(status));
456 err = snd_pcm_status(substream, &status);
457 if (err < 0) {
458 snd_iprintf(buffer, "error %d\n", err);
459 goto unlock;
460 }
461 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
462 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
463 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
464 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
465 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
466 status.tstamp.tv_sec, status.tstamp.tv_nsec);
467 snd_iprintf(buffer, "delay : %ld\n", status.delay);
468 snd_iprintf(buffer, "avail : %ld\n", status.avail);
469 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
470 snd_iprintf(buffer, "-----\n");
471 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
472 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
473 unlock:
474 mutex_unlock(&substream->pcm->open_mutex);
475 }
476
477 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
478 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
479 struct snd_info_buffer *buffer)
480 {
481 struct snd_pcm_substream *substream = entry->private_data;
482
483 snd_pcm_stop_xrun(substream);
484 }
485
486 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
487 struct snd_info_buffer *buffer)
488 {
489 struct snd_pcm_str *pstr = entry->private_data;
490 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
491 }
492
493 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
494 struct snd_info_buffer *buffer)
495 {
496 struct snd_pcm_str *pstr = entry->private_data;
497 char line[64];
498 if (!snd_info_get_line(buffer, line, sizeof(line)))
499 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
500 }
501 #endif
502
503 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
504 {
505 struct snd_pcm *pcm = pstr->pcm;
506 struct snd_info_entry *entry;
507 char name[16];
508
509 sprintf(name, "pcm%i%c", pcm->device,
510 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
511 entry = snd_info_create_card_entry(pcm->card, name,
512 pcm->card->proc_root);
513 if (!entry)
514 return -ENOMEM;
515 entry->mode = S_IFDIR | 0555;
516 pstr->proc_root = entry;
517 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
518 if (entry)
519 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
520 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
521 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
522 pstr->proc_root);
523 if (entry) {
524 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
525 entry->c.text.write = snd_pcm_xrun_debug_write;
526 entry->mode |= 0200;
527 }
528 #endif
529 return 0;
530 }
531
532 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
533 {
534 snd_info_free_entry(pstr->proc_root);
535 pstr->proc_root = NULL;
536 return 0;
537 }
538
539 static struct snd_info_entry *
540 create_substream_info_entry(struct snd_pcm_substream *substream,
541 const char *name,
542 void (*read)(struct snd_info_entry *,
543 struct snd_info_buffer *))
544 {
545 struct snd_info_entry *entry;
546
547 entry = snd_info_create_card_entry(substream->pcm->card, name,
548 substream->proc_root);
549 if (entry)
550 snd_info_set_text_ops(entry, substream, read);
551 return entry;
552 }
553
554 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
555 {
556 struct snd_info_entry *entry;
557 struct snd_card *card;
558 char name[16];
559
560 card = substream->pcm->card;
561
562 sprintf(name, "sub%i", substream->number);
563 entry = snd_info_create_card_entry(card, name,
564 substream->pstr->proc_root);
565 if (!entry)
566 return -ENOMEM;
567 entry->mode = S_IFDIR | 0555;
568 substream->proc_root = entry;
569
570 create_substream_info_entry(substream, "info",
571 snd_pcm_substream_proc_info_read);
572 create_substream_info_entry(substream, "hw_params",
573 snd_pcm_substream_proc_hw_params_read);
574 create_substream_info_entry(substream, "sw_params",
575 snd_pcm_substream_proc_sw_params_read);
576 create_substream_info_entry(substream, "status",
577 snd_pcm_substream_proc_status_read);
578
579 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
580 entry = create_substream_info_entry(substream, "xrun_injection", NULL);
581 if (entry) {
582 entry->c.text.write = snd_pcm_xrun_injection_write;
583 entry->mode = S_IFREG | 0200;
584 }
585 #endif
586
587 return 0;
588 }
589
590 #else
591 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
592 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
593 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
594 #endif
595
596 static const struct attribute_group *pcm_dev_attr_groups[];
597
598
599
600
601
602 #ifdef CONFIG_PM_SLEEP
603 static int do_pcm_suspend(struct device *dev)
604 {
605 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
606
607 if (!pstr->pcm->no_device_suspend)
608 snd_pcm_suspend_all(pstr->pcm);
609 return 0;
610 }
611 #endif
612
613 static const struct dev_pm_ops pcm_dev_pm_ops = {
614 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
615 };
616
617
618 static const struct device_type pcm_dev_type = {
619 .name = "pcm",
620 .pm = &pcm_dev_pm_ops,
621 };
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
637 {
638 int idx, err;
639 struct snd_pcm_str *pstr = &pcm->streams[stream];
640 struct snd_pcm_substream *substream, *prev;
641
642 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
643 mutex_init(&pstr->oss.setup_mutex);
644 #endif
645 pstr->stream = stream;
646 pstr->pcm = pcm;
647 pstr->substream_count = substream_count;
648 if (!substream_count)
649 return 0;
650
651 snd_device_initialize(&pstr->dev, pcm->card);
652 pstr->dev.groups = pcm_dev_attr_groups;
653 pstr->dev.type = &pcm_dev_type;
654 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
655 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
656
657 if (!pcm->internal) {
658 err = snd_pcm_stream_proc_init(pstr);
659 if (err < 0) {
660 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
661 return err;
662 }
663 }
664 prev = NULL;
665 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
666 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
667 if (!substream)
668 return -ENOMEM;
669 substream->pcm = pcm;
670 substream->pstr = pstr;
671 substream->number = idx;
672 substream->stream = stream;
673 sprintf(substream->name, "subdevice #%i", idx);
674 substream->buffer_bytes_max = UINT_MAX;
675 if (prev == NULL)
676 pstr->substream = substream;
677 else
678 prev->next = substream;
679
680 if (!pcm->internal) {
681 err = snd_pcm_substream_proc_init(substream);
682 if (err < 0) {
683 pcm_err(pcm,
684 "Error in snd_pcm_stream_proc_init\n");
685 if (prev == NULL)
686 pstr->substream = NULL;
687 else
688 prev->next = NULL;
689 kfree(substream);
690 return err;
691 }
692 }
693 substream->group = &substream->self_group;
694 snd_pcm_group_init(&substream->self_group);
695 list_add_tail(&substream->link_list, &substream->self_group.substreams);
696 atomic_set(&substream->mmap_count, 0);
697 prev = substream;
698 }
699 return 0;
700 }
701 EXPORT_SYMBOL(snd_pcm_new_stream);
702
703 static 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 static struct snd_device_ops internal_ops = {
715 .dev_free = snd_pcm_dev_free,
716 };
717
718 if (snd_BUG_ON(!card))
719 return -ENXIO;
720 if (rpcm)
721 *rpcm = NULL;
722 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
723 if (!pcm)
724 return -ENOMEM;
725 pcm->card = card;
726 pcm->device = device;
727 pcm->internal = internal;
728 mutex_init(&pcm->open_mutex);
729 init_waitqueue_head(&pcm->open_wait);
730 INIT_LIST_HEAD(&pcm->list);
731 if (id)
732 strlcpy(pcm->id, id, sizeof(pcm->id));
733
734 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
735 playback_count);
736 if (err < 0)
737 goto free_pcm;
738
739 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
740 if (err < 0)
741 goto free_pcm;
742
743 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
744 internal ? &internal_ops : &ops);
745 if (err < 0)
746 goto free_pcm;
747
748 if (rpcm)
749 *rpcm = pcm;
750 return 0;
751
752 free_pcm:
753 snd_pcm_free(pcm);
754 return err;
755 }
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773 int snd_pcm_new(struct snd_card *card, const char *id, int device,
774 int playback_count, int capture_count, struct snd_pcm **rpcm)
775 {
776 return _snd_pcm_new(card, id, device, playback_count, capture_count,
777 false, rpcm);
778 }
779 EXPORT_SYMBOL(snd_pcm_new);
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
802 int playback_count, int capture_count,
803 struct snd_pcm **rpcm)
804 {
805 return _snd_pcm_new(card, id, device, playback_count, capture_count,
806 true, rpcm);
807 }
808 EXPORT_SYMBOL(snd_pcm_new_internal);
809
810 static void free_chmap(struct snd_pcm_str *pstr)
811 {
812 if (pstr->chmap_kctl) {
813 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
814 pstr->chmap_kctl = NULL;
815 }
816 }
817
818 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
819 {
820 struct snd_pcm_substream *substream, *substream_next;
821 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
822 struct snd_pcm_oss_setup *setup, *setupn;
823 #endif
824
825
826 snd_pcm_stream_proc_done(pstr);
827
828 substream = pstr->substream;
829 while (substream) {
830 substream_next = substream->next;
831 snd_pcm_timer_done(substream);
832 kfree(substream);
833 substream = substream_next;
834 }
835 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
836 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
837 setupn = setup->next;
838 kfree(setup->task_name);
839 kfree(setup);
840 }
841 #endif
842 free_chmap(pstr);
843 if (pstr->substream_count)
844 put_device(&pstr->dev);
845 }
846
847 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
848 #define pcm_call_notify(pcm, call) \
849 do { \
850 struct snd_pcm_notify *_notify; \
851 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
852 _notify->call(pcm); \
853 } while (0)
854 #else
855 #define pcm_call_notify(pcm, call) do {} while (0)
856 #endif
857
858 static int snd_pcm_free(struct snd_pcm *pcm)
859 {
860 if (!pcm)
861 return 0;
862 if (!pcm->internal)
863 pcm_call_notify(pcm, n_unregister);
864 if (pcm->private_free)
865 pcm->private_free(pcm);
866 snd_pcm_lib_preallocate_free_for_all(pcm);
867 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
868 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
869 kfree(pcm);
870 return 0;
871 }
872
873 static int snd_pcm_dev_free(struct snd_device *device)
874 {
875 struct snd_pcm *pcm = device->device_data;
876 return snd_pcm_free(pcm);
877 }
878
879 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
880 struct file *file,
881 struct snd_pcm_substream **rsubstream)
882 {
883 struct snd_pcm_str * pstr;
884 struct snd_pcm_substream *substream;
885 struct snd_pcm_runtime *runtime;
886 struct snd_card *card;
887 int prefer_subdevice;
888 size_t size;
889
890 if (snd_BUG_ON(!pcm || !rsubstream))
891 return -ENXIO;
892 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
893 stream != SNDRV_PCM_STREAM_CAPTURE))
894 return -EINVAL;
895 *rsubstream = NULL;
896 pstr = &pcm->streams[stream];
897 if (pstr->substream == NULL || pstr->substream_count == 0)
898 return -ENODEV;
899
900 card = pcm->card;
901 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
902
903 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
904 int opposite = !stream;
905
906 for (substream = pcm->streams[opposite].substream; substream;
907 substream = substream->next) {
908 if (SUBSTREAM_BUSY(substream))
909 return -EAGAIN;
910 }
911 }
912
913 if (file->f_flags & O_APPEND) {
914 if (prefer_subdevice < 0) {
915 if (pstr->substream_count > 1)
916 return -EINVAL;
917 substream = pstr->substream;
918 } else {
919 for (substream = pstr->substream; substream;
920 substream = substream->next)
921 if (substream->number == prefer_subdevice)
922 break;
923 }
924 if (! substream)
925 return -ENODEV;
926 if (! SUBSTREAM_BUSY(substream))
927 return -EBADFD;
928 substream->ref_count++;
929 *rsubstream = substream;
930 return 0;
931 }
932
933 for (substream = pstr->substream; substream; substream = substream->next) {
934 if (!SUBSTREAM_BUSY(substream) &&
935 (prefer_subdevice == -1 ||
936 substream->number == prefer_subdevice))
937 break;
938 }
939 if (substream == NULL)
940 return -EAGAIN;
941
942 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
943 if (runtime == NULL)
944 return -ENOMEM;
945
946 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
947 runtime->status = alloc_pages_exact(size, GFP_KERNEL);
948 if (runtime->status == NULL) {
949 kfree(runtime);
950 return -ENOMEM;
951 }
952 memset(runtime->status, 0, size);
953
954 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
955 runtime->control = alloc_pages_exact(size, GFP_KERNEL);
956 if (runtime->control == NULL) {
957 free_pages_exact(runtime->status,
958 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
959 kfree(runtime);
960 return -ENOMEM;
961 }
962 memset(runtime->control, 0, size);
963
964 init_waitqueue_head(&runtime->sleep);
965 init_waitqueue_head(&runtime->tsleep);
966
967 runtime->status->state = SNDRV_PCM_STATE_OPEN;
968
969 substream->runtime = runtime;
970 substream->private_data = pcm->private_data;
971 substream->ref_count = 1;
972 substream->f_flags = file->f_flags;
973 substream->pid = get_pid(task_pid(current));
974 pstr->substream_opened++;
975 *rsubstream = substream;
976 return 0;
977 }
978
979 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
980 {
981 struct snd_pcm_runtime *runtime;
982
983 if (PCM_RUNTIME_CHECK(substream))
984 return;
985 runtime = substream->runtime;
986 if (runtime->private_free != NULL)
987 runtime->private_free(runtime);
988 free_pages_exact(runtime->status,
989 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
990 free_pages_exact(runtime->control,
991 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
992 kfree(runtime->hw_constraints.rules);
993
994 if (substream->timer)
995 spin_lock_irq(&substream->timer->lock);
996 substream->runtime = NULL;
997 if (substream->timer)
998 spin_unlock_irq(&substream->timer->lock);
999 kfree(runtime);
1000 put_pid(substream->pid);
1001 substream->pid = NULL;
1002 substream->pstr->substream_opened--;
1003 }
1004
1005 static ssize_t show_pcm_class(struct device *dev,
1006 struct device_attribute *attr, char *buf)
1007 {
1008 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1009 struct snd_pcm *pcm = pstr->pcm;
1010 const char *str;
1011 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1012 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1013 [SNDRV_PCM_CLASS_MULTI] = "multi",
1014 [SNDRV_PCM_CLASS_MODEM] = "modem",
1015 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1016 };
1017
1018 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1019 str = "none";
1020 else
1021 str = strs[pcm->dev_class];
1022 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1023 }
1024
1025 static DEVICE_ATTR(pcm_class, 0444, show_pcm_class, NULL);
1026 static struct attribute *pcm_dev_attrs[] = {
1027 &dev_attr_pcm_class.attr,
1028 NULL
1029 };
1030
1031 static const struct attribute_group pcm_dev_attr_group = {
1032 .attrs = pcm_dev_attrs,
1033 };
1034
1035 static const struct attribute_group *pcm_dev_attr_groups[] = {
1036 &pcm_dev_attr_group,
1037 NULL
1038 };
1039
1040 static int snd_pcm_dev_register(struct snd_device *device)
1041 {
1042 int cidx, err;
1043 struct snd_pcm_substream *substream;
1044 struct snd_pcm *pcm;
1045
1046 if (snd_BUG_ON(!device || !device->device_data))
1047 return -ENXIO;
1048 pcm = device->device_data;
1049
1050 mutex_lock(®ister_mutex);
1051 err = snd_pcm_add(pcm);
1052 if (err)
1053 goto unlock;
1054 for (cidx = 0; cidx < 2; cidx++) {
1055 int devtype = -1;
1056 if (pcm->streams[cidx].substream == NULL)
1057 continue;
1058 switch (cidx) {
1059 case SNDRV_PCM_STREAM_PLAYBACK:
1060 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1061 break;
1062 case SNDRV_PCM_STREAM_CAPTURE:
1063 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1064 break;
1065 }
1066
1067 err = snd_register_device(devtype, pcm->card, pcm->device,
1068 &snd_pcm_f_ops[cidx], pcm,
1069 &pcm->streams[cidx].dev);
1070 if (err < 0) {
1071 list_del_init(&pcm->list);
1072 goto unlock;
1073 }
1074
1075 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1076 snd_pcm_timer_init(substream);
1077 }
1078
1079 pcm_call_notify(pcm, n_register);
1080
1081 unlock:
1082 mutex_unlock(®ister_mutex);
1083 return err;
1084 }
1085
1086 static int snd_pcm_dev_disconnect(struct snd_device *device)
1087 {
1088 struct snd_pcm *pcm = device->device_data;
1089 struct snd_pcm_substream *substream;
1090 int cidx;
1091
1092 mutex_lock(®ister_mutex);
1093 mutex_lock(&pcm->open_mutex);
1094 wake_up(&pcm->open_wait);
1095 list_del_init(&pcm->list);
1096 for (cidx = 0; cidx < 2; cidx++) {
1097 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1098 snd_pcm_stream_lock_irq(substream);
1099 if (substream->runtime) {
1100 if (snd_pcm_running(substream))
1101 snd_pcm_stop(substream,
1102 SNDRV_PCM_STATE_DISCONNECTED);
1103
1104 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1105 wake_up(&substream->runtime->sleep);
1106 wake_up(&substream->runtime->tsleep);
1107 }
1108 snd_pcm_stream_unlock_irq(substream);
1109 }
1110 }
1111
1112 pcm_call_notify(pcm, n_disconnect);
1113 for (cidx = 0; cidx < 2; cidx++) {
1114 snd_unregister_device(&pcm->streams[cidx].dev);
1115 free_chmap(&pcm->streams[cidx]);
1116 }
1117 mutex_unlock(&pcm->open_mutex);
1118 mutex_unlock(®ister_mutex);
1119 return 0;
1120 }
1121
1122 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1133 {
1134 struct snd_pcm *pcm;
1135
1136 if (snd_BUG_ON(!notify ||
1137 !notify->n_register ||
1138 !notify->n_unregister ||
1139 !notify->n_disconnect))
1140 return -EINVAL;
1141 mutex_lock(®ister_mutex);
1142 if (nfree) {
1143 list_del(¬ify->list);
1144 list_for_each_entry(pcm, &snd_pcm_devices, list)
1145 notify->n_unregister(pcm);
1146 } else {
1147 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1148 list_for_each_entry(pcm, &snd_pcm_devices, list)
1149 notify->n_register(pcm);
1150 }
1151 mutex_unlock(®ister_mutex);
1152 return 0;
1153 }
1154 EXPORT_SYMBOL(snd_pcm_notify);
1155 #endif
1156
1157 #ifdef CONFIG_SND_PROC_FS
1158
1159
1160
1161
1162 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1163 struct snd_info_buffer *buffer)
1164 {
1165 struct snd_pcm *pcm;
1166
1167 mutex_lock(®ister_mutex);
1168 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1169 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1170 pcm->card->number, pcm->device, pcm->id, pcm->name);
1171 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1172 snd_iprintf(buffer, " : playback %i",
1173 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1174 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1175 snd_iprintf(buffer, " : capture %i",
1176 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1177 snd_iprintf(buffer, "\n");
1178 }
1179 mutex_unlock(®ister_mutex);
1180 }
1181
1182 static struct snd_info_entry *snd_pcm_proc_entry;
1183
1184 static void snd_pcm_proc_init(void)
1185 {
1186 struct snd_info_entry *entry;
1187
1188 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1189 if (entry) {
1190 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1191 if (snd_info_register(entry) < 0) {
1192 snd_info_free_entry(entry);
1193 entry = NULL;
1194 }
1195 }
1196 snd_pcm_proc_entry = entry;
1197 }
1198
1199 static void snd_pcm_proc_done(void)
1200 {
1201 snd_info_free_entry(snd_pcm_proc_entry);
1202 }
1203
1204 #else
1205 #define snd_pcm_proc_init()
1206 #define snd_pcm_proc_done()
1207 #endif
1208
1209
1210
1211
1212
1213
1214 static int __init alsa_pcm_init(void)
1215 {
1216 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1217 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1218 snd_pcm_proc_init();
1219 return 0;
1220 }
1221
1222 static void __exit alsa_pcm_exit(void)
1223 {
1224 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1225 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1226 snd_pcm_proc_done();
1227 }
1228
1229 module_init(alsa_pcm_init)
1230 module_exit(alsa_pcm_exit)