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