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