/sound/core/pcm.c
C | 1153 lines | 988 code | 106 blank | 59 comment | 171 complexity | 879cd627fbac18bff5de1b0ebd34b5d6 MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
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};
207
208const char *snd_pcm_format_name(snd_pcm_format_t format)
209{
210 return snd_pcm_format_names[format];
211}
212EXPORT_SYMBOL_GPL(snd_pcm_format_name);
213
214#ifdef CONFIG_SND_VERBOSE_PROCFS
215
216#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
217#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
218#define READY(v) [SNDRV_PCM_READY_##v] = #v
219#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
220#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
221#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
222#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
223#define START(v) [SNDRV_PCM_START_##v] = #v
224#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
225
226static char *snd_pcm_stream_names[] = {
227 STREAM(PLAYBACK),
228 STREAM(CAPTURE),
229};
230
231static char *snd_pcm_state_names[] = {
232 STATE(OPEN),
233 STATE(SETUP),
234 STATE(PREPARED),
235 STATE(RUNNING),
236 STATE(XRUN),
237 STATE(DRAINING),
238 STATE(PAUSED),
239 STATE(SUSPENDED),
240};
241
242static char *snd_pcm_access_names[] = {
243 ACCESS(MMAP_INTERLEAVED),
244 ACCESS(MMAP_NONINTERLEAVED),
245 ACCESS(MMAP_COMPLEX),
246 ACCESS(RW_INTERLEAVED),
247 ACCESS(RW_NONINTERLEAVED),
248};
249
250static char *snd_pcm_subformat_names[] = {
251 SUBFORMAT(STD),
252};
253
254static char *snd_pcm_tstamp_mode_names[] = {
255 TSTAMP(NONE),
256 TSTAMP(ENABLE),
257};
258
259static const char *snd_pcm_stream_name(int stream)
260{
261 return snd_pcm_stream_names[stream];
262}
263
264static const char *snd_pcm_access_name(snd_pcm_access_t access)
265{
266 return snd_pcm_access_names[access];
267}
268
269static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
270{
271 return snd_pcm_subformat_names[subformat];
272}
273
274static const char *snd_pcm_tstamp_mode_name(int mode)
275{
276 return snd_pcm_tstamp_mode_names[mode];
277}
278
279static const char *snd_pcm_state_name(snd_pcm_state_t state)
280{
281 return snd_pcm_state_names[state];
282}
283
284#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
285#include <linux/soundcard.h>
286
287static const char *snd_pcm_oss_format_name(int format)
288{
289 switch (format) {
290 case AFMT_MU_LAW:
291 return "MU_LAW";
292 case AFMT_A_LAW:
293 return "A_LAW";
294 case AFMT_IMA_ADPCM:
295 return "IMA_ADPCM";
296 case AFMT_U8:
297 return "U8";
298 case AFMT_S16_LE:
299 return "S16_LE";
300 case AFMT_S16_BE:
301 return "S16_BE";
302 case AFMT_S8:
303 return "S8";
304 case AFMT_U16_LE:
305 return "U16_LE";
306 case AFMT_U16_BE:
307 return "U16_BE";
308 case AFMT_MPEG:
309 return "MPEG";
310 default:
311 return "unknown";
312 }
313}
314#endif
315
316static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
317 struct snd_info_buffer *buffer)
318{
319 struct snd_pcm_info *info;
320 int err;
321
322 if (! substream)
323 return;
324
325 info = kmalloc(sizeof(*info), GFP_KERNEL);
326 if (! info) {
327 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
328 return;
329 }
330
331 err = snd_pcm_info(substream, info);
332 if (err < 0) {
333 snd_iprintf(buffer, "error %d\n", err);
334 kfree(info);
335 return;
336 }
337 snd_iprintf(buffer, "card: %d\n", info->card);
338 snd_iprintf(buffer, "device: %d\n", info->device);
339 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
340 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
341 snd_iprintf(buffer, "id: %s\n", info->id);
342 snd_iprintf(buffer, "name: %s\n", info->name);
343 snd_iprintf(buffer, "subname: %s\n", info->subname);
344 snd_iprintf(buffer, "class: %d\n", info->dev_class);
345 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
346 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
347 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
348 kfree(info);
349}
350
351static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
352 struct snd_info_buffer *buffer)
353{
354 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
355 buffer);
356}
357
358static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
359 struct snd_info_buffer *buffer)
360{
361 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
362 buffer);
363}
364
365static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
366 struct snd_info_buffer *buffer)
367{
368 struct snd_pcm_substream *substream = entry->private_data;
369 struct snd_pcm_runtime *runtime = substream->runtime;
370 if (!runtime) {
371 snd_iprintf(buffer, "closed\n");
372 return;
373 }
374 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
375 snd_iprintf(buffer, "no setup\n");
376 return;
377 }
378 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
379 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
380 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
381 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
382 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
383 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
384 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
385#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
386 if (substream->oss.oss) {
387 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
388 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
389 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
390 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
391 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
392 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
393 }
394#endif
395}
396
397static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
398 struct snd_info_buffer *buffer)
399{
400 struct snd_pcm_substream *substream = entry->private_data;
401 struct snd_pcm_runtime *runtime = substream->runtime;
402 if (!runtime) {
403 snd_iprintf(buffer, "closed\n");
404 return;
405 }
406 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
407 snd_iprintf(buffer, "no setup\n");
408 return;
409 }
410 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
411 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
412 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
413 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
414 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
415 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
416 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
417 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
418}
419
420static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
421 struct snd_info_buffer *buffer)
422{
423 struct snd_pcm_substream *substream = entry->private_data;
424 struct snd_pcm_runtime *runtime = substream->runtime;
425 struct snd_pcm_status status;
426 int err;
427 if (!runtime) {
428 snd_iprintf(buffer, "closed\n");
429 return;
430 }
431 memset(&status, 0, sizeof(status));
432 err = snd_pcm_status(substream, &status);
433 if (err < 0) {
434 snd_iprintf(buffer, "error %d\n", err);
435 return;
436 }
437 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
438 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
439 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
440 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
441 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
442 status.tstamp.tv_sec, status.tstamp.tv_nsec);
443 snd_iprintf(buffer, "delay : %ld\n", status.delay);
444 snd_iprintf(buffer, "avail : %ld\n", status.avail);
445 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
446 snd_iprintf(buffer, "-----\n");
447 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
448 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
449}
450
451#ifdef CONFIG_SND_PCM_XRUN_DEBUG
452static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
453 struct snd_info_buffer *buffer)
454{
455 struct snd_pcm_str *pstr = entry->private_data;
456 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
457}
458
459static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
460 struct snd_info_buffer *buffer)
461{
462 struct snd_pcm_str *pstr = entry->private_data;
463 char line[64];
464 if (!snd_info_get_line(buffer, line, sizeof(line)))
465 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
466}
467#endif
468
469static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
470{
471 struct snd_pcm *pcm = pstr->pcm;
472 struct snd_info_entry *entry;
473 char name[16];
474
475 sprintf(name, "pcm%i%c", pcm->device,
476 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
477 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
478 return -ENOMEM;
479 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
480 if (snd_info_register(entry) < 0) {
481 snd_info_free_entry(entry);
482 return -ENOMEM;
483 }
484 pstr->proc_root = entry;
485
486 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
487 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
488 if (snd_info_register(entry) < 0) {
489 snd_info_free_entry(entry);
490 entry = NULL;
491 }
492 }
493 pstr->proc_info_entry = entry;
494
495#ifdef CONFIG_SND_PCM_XRUN_DEBUG
496 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
497 pstr->proc_root)) != NULL) {
498 entry->c.text.read = snd_pcm_xrun_debug_read;
499 entry->c.text.write = snd_pcm_xrun_debug_write;
500 entry->mode |= S_IWUSR;
501 entry->private_data = pstr;
502 if (snd_info_register(entry) < 0) {
503 snd_info_free_entry(entry);
504 entry = NULL;
505 }
506 }
507 pstr->proc_xrun_debug_entry = entry;
508#endif
509 return 0;
510}
511
512static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
513{
514#ifdef CONFIG_SND_PCM_XRUN_DEBUG
515 snd_info_free_entry(pstr->proc_xrun_debug_entry);
516 pstr->proc_xrun_debug_entry = NULL;
517#endif
518 snd_info_free_entry(pstr->proc_info_entry);
519 pstr->proc_info_entry = NULL;
520 snd_info_free_entry(pstr->proc_root);
521 pstr->proc_root = NULL;
522 return 0;
523}
524
525static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
526{
527 struct snd_info_entry *entry;
528 struct snd_card *card;
529 char name[16];
530
531 card = substream->pcm->card;
532
533 sprintf(name, "sub%i", substream->number);
534 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
535 return -ENOMEM;
536 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
537 if (snd_info_register(entry) < 0) {
538 snd_info_free_entry(entry);
539 return -ENOMEM;
540 }
541 substream->proc_root = entry;
542
543 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
544 snd_info_set_text_ops(entry, substream,
545 snd_pcm_substream_proc_info_read);
546 if (snd_info_register(entry) < 0) {
547 snd_info_free_entry(entry);
548 entry = NULL;
549 }
550 }
551 substream->proc_info_entry = entry;
552
553 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
554 snd_info_set_text_ops(entry, substream,
555 snd_pcm_substream_proc_hw_params_read);
556 if (snd_info_register(entry) < 0) {
557 snd_info_free_entry(entry);
558 entry = NULL;
559 }
560 }
561 substream->proc_hw_params_entry = entry;
562
563 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
564 snd_info_set_text_ops(entry, substream,
565 snd_pcm_substream_proc_sw_params_read);
566 if (snd_info_register(entry) < 0) {
567 snd_info_free_entry(entry);
568 entry = NULL;
569 }
570 }
571 substream->proc_sw_params_entry = entry;
572
573 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
574 snd_info_set_text_ops(entry, substream,
575 snd_pcm_substream_proc_status_read);
576 if (snd_info_register(entry) < 0) {
577 snd_info_free_entry(entry);
578 entry = NULL;
579 }
580 }
581 substream->proc_status_entry = entry;
582
583 return 0;
584}
585
586static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
587{
588 snd_info_free_entry(substream->proc_info_entry);
589 substream->proc_info_entry = NULL;
590 snd_info_free_entry(substream->proc_hw_params_entry);
591 substream->proc_hw_params_entry = NULL;
592 snd_info_free_entry(substream->proc_sw_params_entry);
593 substream->proc_sw_params_entry = NULL;
594 snd_info_free_entry(substream->proc_status_entry);
595 substream->proc_status_entry = NULL;
596 snd_info_free_entry(substream->proc_root);
597 substream->proc_root = NULL;
598 return 0;
599}
600#else /* !CONFIG_SND_VERBOSE_PROCFS */
601static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
602static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
603static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
604static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
605#endif /* CONFIG_SND_VERBOSE_PROCFS */
606
607/**
608 * snd_pcm_new_stream - create a new PCM stream
609 * @pcm: the pcm instance
610 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
611 * @substream_count: the number of substreams
612 *
613 * Creates a new stream for the pcm.
614 * The corresponding stream on the pcm must have been empty before
615 * calling this, i.e. zero must be given to the argument of
616 * snd_pcm_new().
617 *
618 * Returns zero if successful, or a negative error code on failure.
619 */
620int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
621{
622 int idx, err;
623 struct snd_pcm_str *pstr = &pcm->streams[stream];
624 struct snd_pcm_substream *substream, *prev;
625
626#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
627 mutex_init(&pstr->oss.setup_mutex);
628#endif
629 pstr->stream = stream;
630 pstr->pcm = pcm;
631 pstr->substream_count = substream_count;
632 if (substream_count > 0) {
633 err = snd_pcm_stream_proc_init(pstr);
634 if (err < 0) {
635 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
636 return err;
637 }
638 }
639 prev = NULL;
640 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
641 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
642 if (substream == NULL) {
643 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
644 return -ENOMEM;
645 }
646 substream->pcm = pcm;
647 substream->pstr = pstr;
648 substream->number = idx;
649 substream->stream = stream;
650 sprintf(substream->name, "subdevice #%i", idx);
651 snprintf(substream->latency_id, sizeof(substream->latency_id),
652 "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
653 (stream ? 'c' : 'p'), idx);
654 substream->buffer_bytes_max = UINT_MAX;
655 if (prev == NULL)
656 pstr->substream = substream;
657 else
658 prev->next = substream;
659 err = snd_pcm_substream_proc_init(substream);
660 if (err < 0) {
661 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
662 if (prev == NULL)
663 pstr->substream = NULL;
664 else
665 prev->next = NULL;
666 kfree(substream);
667 return err;
668 }
669 substream->group = &substream->self_group;
670 spin_lock_init(&substream->self_group.lock);
671 INIT_LIST_HEAD(&substream->self_group.substreams);
672 list_add_tail(&substream->link_list, &substream->self_group.substreams);
673 atomic_set(&substream->mmap_count, 0);
674 prev = substream;
675 }
676 return 0;
677}
678
679EXPORT_SYMBOL(snd_pcm_new_stream);
680
681/**
682 * snd_pcm_new - create a new PCM instance
683 * @card: the card instance
684 * @id: the id string
685 * @device: the device index (zero based)
686 * @playback_count: the number of substreams for playback
687 * @capture_count: the number of substreams for capture
688 * @rpcm: the pointer to store the new pcm instance
689 *
690 * Creates a new PCM instance.
691 *
692 * The pcm operators have to be set afterwards to the new instance
693 * via snd_pcm_set_ops().
694 *
695 * Returns zero if successful, or a negative error code on failure.
696 */
697int snd_pcm_new(struct snd_card *card, const char *id, int device,
698 int playback_count, int capture_count,
699 struct snd_pcm ** rpcm)
700{
701 struct snd_pcm *pcm;
702 int err;
703 static struct snd_device_ops ops = {
704 .dev_free = snd_pcm_dev_free,
705 .dev_register = snd_pcm_dev_register,
706 .dev_disconnect = snd_pcm_dev_disconnect,
707 };
708
709 if (snd_BUG_ON(!card))
710 return -ENXIO;
711 if (rpcm)
712 *rpcm = NULL;
713 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
714 if (pcm == NULL) {
715 snd_printk(KERN_ERR "Cannot allocate PCM\n");
716 return -ENOMEM;
717 }
718 pcm->card = card;
719 pcm->device = device;
720 if (id)
721 strlcpy(pcm->id, id, sizeof(pcm->id));
722 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
723 snd_pcm_free(pcm);
724 return err;
725 }
726 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
727 snd_pcm_free(pcm);
728 return err;
729 }
730 mutex_init(&pcm->open_mutex);
731 init_waitqueue_head(&pcm->open_wait);
732 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
733 snd_pcm_free(pcm);
734 return err;
735 }
736 if (rpcm)
737 *rpcm = pcm;
738 return 0;
739}
740
741EXPORT_SYMBOL(snd_pcm_new);
742
743static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
744{
745 struct snd_pcm_substream *substream, *substream_next;
746#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
747 struct snd_pcm_oss_setup *setup, *setupn;
748#endif
749 substream = pstr->substream;
750 while (substream) {
751 substream_next = substream->next;
752 snd_pcm_timer_done(substream);
753 snd_pcm_substream_proc_done(substream);
754 kfree(substream);
755 substream = substream_next;
756 }
757 snd_pcm_stream_proc_done(pstr);
758#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
759 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
760 setupn = setup->next;
761 kfree(setup->task_name);
762 kfree(setup);
763 }
764#endif
765}
766
767static int snd_pcm_free(struct snd_pcm *pcm)
768{
769 struct snd_pcm_notify *notify;
770
771 if (!pcm)
772 return 0;
773 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
774 notify->n_unregister(pcm);
775 }
776 if (pcm->private_free)
777 pcm->private_free(pcm);
778 snd_pcm_lib_preallocate_free_for_all(pcm);
779 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
780 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
781 kfree(pcm);
782 return 0;
783}
784
785static int snd_pcm_dev_free(struct snd_device *device)
786{
787 struct snd_pcm *pcm = device->device_data;
788 return snd_pcm_free(pcm);
789}
790
791int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
792 struct file *file,
793 struct snd_pcm_substream **rsubstream)
794{
795 struct snd_pcm_str * pstr;
796 struct snd_pcm_substream *substream;
797 struct snd_pcm_runtime *runtime;
798 struct snd_ctl_file *kctl;
799 struct snd_card *card;
800 int prefer_subdevice = -1;
801 size_t size;
802
803 if (snd_BUG_ON(!pcm || !rsubstream))
804 return -ENXIO;
805 *rsubstream = NULL;
806 pstr = &pcm->streams[stream];
807 if (pstr->substream == NULL || pstr->substream_count == 0)
808 return -ENODEV;
809
810 card = pcm->card;
811 read_lock(&card->ctl_files_rwlock);
812 list_for_each_entry(kctl, &card->ctl_files, list) {
813 if (kctl->pid == task_pid(current)) {
814 prefer_subdevice = kctl->prefer_pcm_subdevice;
815 if (prefer_subdevice != -1)
816 break;
817 }
818 }
819 read_unlock(&card->ctl_files_rwlock);
820
821 switch (stream) {
822 case SNDRV_PCM_STREAM_PLAYBACK:
823 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
824 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
825 if (SUBSTREAM_BUSY(substream))
826 return -EAGAIN;
827 }
828 }
829 break;
830 case SNDRV_PCM_STREAM_CAPTURE:
831 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
832 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
833 if (SUBSTREAM_BUSY(substream))
834 return -EAGAIN;
835 }
836 }
837 break;
838 default:
839 return -EINVAL;
840 }
841
842 if (file->f_flags & O_APPEND) {
843 if (prefer_subdevice < 0) {
844 if (pstr->substream_count > 1)
845 return -EINVAL; /* must be unique */
846 substream = pstr->substream;
847 } else {
848 for (substream = pstr->substream; substream;
849 substream = substream->next)
850 if (substream->number == prefer_subdevice)
851 break;
852 }
853 if (! substream)
854 return -ENODEV;
855 if (! SUBSTREAM_BUSY(substream))
856 return -EBADFD;
857 substream->ref_count++;
858 *rsubstream = substream;
859 return 0;
860 }
861
862 if (prefer_subdevice >= 0) {
863 for (substream = pstr->substream; substream; substream = substream->next)
864 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
865 goto __ok;
866 }
867 for (substream = pstr->substream; substream; substream = substream->next)
868 if (!SUBSTREAM_BUSY(substream))
869 break;
870 __ok:
871 if (substream == NULL)
872 return -EAGAIN;
873
874 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
875 if (runtime == NULL)
876 return -ENOMEM;
877
878 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
879 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
880 if (runtime->status == NULL) {
881 kfree(runtime);
882 return -ENOMEM;
883 }
884 memset((void*)runtime->status, 0, size);
885
886 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
887 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
888 if (runtime->control == NULL) {
889 snd_free_pages((void*)runtime->status,
890 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
891 kfree(runtime);
892 return -ENOMEM;
893 }
894 memset((void*)runtime->control, 0, size);
895
896 init_waitqueue_head(&runtime->sleep);
897 init_waitqueue_head(&runtime->tsleep);
898
899 runtime->status->state = SNDRV_PCM_STATE_OPEN;
900
901 substream->runtime = runtime;
902 substream->private_data = pcm->private_data;
903 substream->ref_count = 1;
904 substream->f_flags = file->f_flags;
905 substream->pid = get_pid(task_pid(current));
906 pstr->substream_opened++;
907 *rsubstream = substream;
908 return 0;
909}
910
911void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
912{
913 struct snd_pcm_runtime *runtime;
914
915 if (PCM_RUNTIME_CHECK(substream))
916 return;
917 runtime = substream->runtime;
918 if (runtime->private_free != NULL)
919 runtime->private_free(runtime);
920 snd_free_pages((void*)runtime->status,
921 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
922 snd_free_pages((void*)runtime->control,
923 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
924 kfree(runtime->hw_constraints.rules);
925#ifdef CONFIG_SND_PCM_XRUN_DEBUG
926 if (runtime->hwptr_log)
927 kfree(runtime->hwptr_log);
928#endif
929 kfree(runtime);
930 substream->runtime = NULL;
931 put_pid(substream->pid);
932 substream->pid = NULL;
933 substream->pstr->substream_opened--;
934}
935
936static ssize_t show_pcm_class(struct device *dev,
937 struct device_attribute *attr, char *buf)
938{
939 struct snd_pcm *pcm;
940 const char *str;
941 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
942 [SNDRV_PCM_CLASS_GENERIC] = "generic",
943 [SNDRV_PCM_CLASS_MULTI] = "multi",
944 [SNDRV_PCM_CLASS_MODEM] = "modem",
945 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
946 };
947
948 if (! (pcm = dev_get_drvdata(dev)) ||
949 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
950 str = "none";
951 else
952 str = strs[pcm->dev_class];
953 return snprintf(buf, PAGE_SIZE, "%s\n", str);
954}
955
956static struct device_attribute pcm_attrs =
957 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
958
959static int snd_pcm_dev_register(struct snd_device *device)
960{
961 int cidx, err;
962 struct snd_pcm_substream *substream;
963 struct snd_pcm_notify *notify;
964 char str[16];
965 struct snd_pcm *pcm;
966 struct device *dev;
967
968 if (snd_BUG_ON(!device || !device->device_data))
969 return -ENXIO;
970 pcm = device->device_data;
971 mutex_lock(®ister_mutex);
972 err = snd_pcm_add(pcm);
973 if (err) {
974 mutex_unlock(®ister_mutex);
975 return err;
976 }
977 for (cidx = 0; cidx < 2; cidx++) {
978 int devtype = -1;
979 if (pcm->streams[cidx].substream == NULL)
980 continue;
981 switch (cidx) {
982 case SNDRV_PCM_STREAM_PLAYBACK:
983 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
984 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
985 break;
986 case SNDRV_PCM_STREAM_CAPTURE:
987 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
988 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
989 break;
990 }
991 /* device pointer to use, pcm->dev takes precedence if
992 * it is assigned, otherwise fall back to card's device
993 * if possible */
994 dev = pcm->dev;
995 if (!dev)
996 dev = snd_card_get_device_link(pcm->card);
997 /* register pcm */
998 err = snd_register_device_for_dev(devtype, pcm->card,
999 pcm->device,
1000 &snd_pcm_f_ops[cidx],
1001 pcm, str, dev);
1002 if (err < 0) {
1003 list_del(&pcm->list);
1004 mutex_unlock(®ister_mutex);
1005 return err;
1006 }
1007 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1008 &pcm_attrs);
1009 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1010 snd_pcm_timer_init(substream);
1011 }
1012
1013 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1014 notify->n_register(pcm);
1015
1016 mutex_unlock(®ister_mutex);
1017 return 0;
1018}
1019
1020static int snd_pcm_dev_disconnect(struct snd_device *device)
1021{
1022 struct snd_pcm *pcm = device->device_data;
1023 struct snd_pcm_notify *notify;
1024 struct snd_pcm_substream *substream;
1025 int cidx, devtype;
1026
1027 mutex_lock(®ister_mutex);
1028 if (list_empty(&pcm->list))
1029 goto unlock;
1030
1031 list_del_init(&pcm->list);
1032 for (cidx = 0; cidx < 2; cidx++)
1033 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1034 if (substream->runtime)
1035 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1036 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1037 notify->n_disconnect(pcm);
1038 }
1039 for (cidx = 0; cidx < 2; cidx++) {
1040 devtype = -1;
1041 switch (cidx) {
1042 case SNDRV_PCM_STREAM_PLAYBACK:
1043 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1044 break;
1045 case SNDRV_PCM_STREAM_CAPTURE:
1046 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1047 break;
1048 }
1049 snd_unregister_device(devtype, pcm->card, pcm->device);
1050 }
1051 unlock:
1052 mutex_unlock(®ister_mutex);
1053 return 0;
1054}
1055
1056int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1057{
1058 struct snd_pcm *pcm;
1059
1060 if (snd_BUG_ON(!notify ||
1061 !notify->n_register ||
1062 !notify->n_unregister ||
1063 !notify->n_disconnect))
1064 return -EINVAL;
1065 mutex_lock(®ister_mutex);
1066 if (nfree) {
1067 list_del(¬ify->list);
1068 list_for_each_entry(pcm, &snd_pcm_devices, list)
1069 notify->n_unregister(pcm);
1070 } else {
1071 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1072 list_for_each_entry(pcm, &snd_pcm_devices, list)
1073 notify->n_register(pcm);
1074 }
1075 mutex_unlock(®ister_mutex);
1076 return 0;
1077}
1078
1079EXPORT_SYMBOL(snd_pcm_notify);
1080
1081#ifdef CONFIG_PROC_FS
1082/*
1083 * Info interface
1084 */
1085
1086static void snd_pcm_proc_read(struct snd_info_entry *entry,
1087 struct snd_info_buffer *buffer)
1088{
1089 struct snd_pcm *pcm;
1090
1091 mutex_lock(®ister_mutex);
1092 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1093 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1094 pcm->card->number, pcm->device, pcm->id, pcm->name);
1095 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1096 snd_iprintf(buffer, " : playback %i",
1097 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1098 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1099 snd_iprintf(buffer, " : capture %i",
1100 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1101 snd_iprintf(buffer, "\n");
1102 }
1103 mutex_unlock(®ister_mutex);
1104}
1105
1106static struct snd_info_entry *snd_pcm_proc_entry;
1107
1108static void snd_pcm_proc_init(void)
1109{
1110 struct snd_info_entry *entry;
1111
1112 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1113 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1114 if (snd_info_register(entry) < 0) {
1115 snd_info_free_entry(entry);
1116 entry = NULL;
1117 }
1118 }
1119 snd_pcm_proc_entry = entry;
1120}
1121
1122static void snd_pcm_proc_done(void)
1123{
1124 snd_info_free_entry(snd_pcm_proc_entry);
1125}
1126
1127#else /* !CONFIG_PROC_FS */
1128#define snd_pcm_proc_init()
1129#define snd_pcm_proc_done()
1130#endif /* CONFIG_PROC_FS */
1131
1132
1133/*
1134 * ENTRY functions
1135 */
1136
1137static int __init alsa_pcm_init(void)
1138{
1139 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1140 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1141 snd_pcm_proc_init();
1142 return 0;
1143}
1144
1145static void __exit alsa_pcm_exit(void)
1146{
1147 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1148 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1149 snd_pcm_proc_done();
1150}
1151
1152module_init(alsa_pcm_init)
1153module_exit(alsa_pcm_exit)