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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
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
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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
750
751
752
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755
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760
761
762
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
774
775
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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;
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 kfree(runtime->hwptr_log);
985#endif
986 kfree(runtime);
987 substream->runtime = NULL;
988 put_pid(substream->pid);
989 substream->pid = NULL;
990 substream->pstr->substream_opened--;
991}
992
993static ssize_t show_pcm_class(struct device *dev,
994 struct device_attribute *attr, char *buf)
995{
996 struct snd_pcm *pcm;
997 const char *str;
998 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
999 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1000 [SNDRV_PCM_CLASS_MULTI] = "multi",
1001 [SNDRV_PCM_CLASS_MODEM] = "modem",
1002 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1003 };
1004
1005 if (! (pcm = dev_get_drvdata(dev)) ||
1006 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1007 str = "none";
1008 else
1009 str = strs[pcm->dev_class];
1010 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1011}
1012
1013static struct device_attribute pcm_attrs =
1014 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1015
1016static int snd_pcm_dev_register(struct snd_device *device)
1017{
1018 int cidx, err;
1019 struct snd_pcm_substream *substream;
1020 struct snd_pcm_notify *notify;
1021 char str[16];
1022 struct snd_pcm *pcm;
1023 struct device *dev;
1024
1025 if (snd_BUG_ON(!device || !device->device_data))
1026 return -ENXIO;
1027 pcm = device->device_data;
1028 mutex_lock(®ister_mutex);
1029 err = snd_pcm_add(pcm);
1030 if (err) {
1031 mutex_unlock(®ister_mutex);
1032 return err;
1033 }
1034 for (cidx = 0; cidx < 2; cidx++) {
1035 int devtype = -1;
1036 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1037 continue;
1038 switch (cidx) {
1039 case SNDRV_PCM_STREAM_PLAYBACK:
1040 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1041 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1042 break;
1043 case SNDRV_PCM_STREAM_CAPTURE:
1044 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1045 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1046 break;
1047 }
1048
1049
1050
1051 dev = pcm->dev;
1052 if (!dev)
1053 dev = snd_card_get_device_link(pcm->card);
1054
1055 err = snd_register_device_for_dev(devtype, pcm->card,
1056 pcm->device,
1057 &snd_pcm_f_ops[cidx],
1058 pcm, str, dev);
1059 if (err < 0) {
1060 list_del(&pcm->list);
1061 mutex_unlock(®ister_mutex);
1062 return err;
1063 }
1064 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1065 &pcm_attrs);
1066 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1067 snd_pcm_timer_init(substream);
1068 }
1069
1070 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1071 notify->n_register(pcm);
1072
1073 mutex_unlock(®ister_mutex);
1074 return 0;
1075}
1076
1077static int snd_pcm_dev_disconnect(struct snd_device *device)
1078{
1079 struct snd_pcm *pcm = device->device_data;
1080 struct snd_pcm_notify *notify;
1081 struct snd_pcm_substream *substream;
1082 int cidx, devtype;
1083
1084 mutex_lock(®ister_mutex);
1085 if (list_empty(&pcm->list))
1086 goto unlock;
1087
1088 mutex_lock(&pcm->open_mutex);
1089 wake_up(&pcm->open_wait);
1090 list_del_init(&pcm->list);
1091 for (cidx = 0; cidx < 2; cidx++)
1092 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1093 snd_pcm_stream_lock_irq(substream);
1094 if (substream->runtime) {
1095 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1096 wake_up(&substream->runtime->sleep);
1097 wake_up(&substream->runtime->tsleep);
1098 }
1099 snd_pcm_stream_unlock_irq(substream);
1100 }
1101 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1102 notify->n_disconnect(pcm);
1103 }
1104 for (cidx = 0; cidx < 2; cidx++) {
1105 devtype = -1;
1106 switch (cidx) {
1107 case SNDRV_PCM_STREAM_PLAYBACK:
1108 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1109 break;
1110 case SNDRV_PCM_STREAM_CAPTURE:
1111 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1112 break;
1113 }
1114 snd_unregister_device(devtype, pcm->card, pcm->device);
1115 if (pcm->streams[cidx].chmap_kctl) {
1116 snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1117 pcm->streams[cidx].chmap_kctl = NULL;
1118 }
1119 }
1120 mutex_unlock(&pcm->open_mutex);
1121 unlock:
1122 mutex_unlock(®ister_mutex);
1123 return 0;
1124}
1125
1126int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1127{
1128 struct snd_pcm *pcm;
1129
1130 if (snd_BUG_ON(!notify ||
1131 !notify->n_register ||
1132 !notify->n_unregister ||
1133 !notify->n_disconnect))
1134 return -EINVAL;
1135 mutex_lock(®ister_mutex);
1136 if (nfree) {
1137 list_del(¬ify->list);
1138 list_for_each_entry(pcm, &snd_pcm_devices, list)
1139 notify->n_unregister(pcm);
1140 } else {
1141 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1142 list_for_each_entry(pcm, &snd_pcm_devices, list)
1143 notify->n_register(pcm);
1144 }
1145 mutex_unlock(®ister_mutex);
1146 return 0;
1147}
1148
1149EXPORT_SYMBOL(snd_pcm_notify);
1150
1151#ifdef CONFIG_PROC_FS
1152
1153
1154
1155
1156static void snd_pcm_proc_read(struct snd_info_entry *entry,
1157 struct snd_info_buffer *buffer)
1158{
1159 struct snd_pcm *pcm;
1160
1161 mutex_lock(®ister_mutex);
1162 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1163 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1164 pcm->card->number, pcm->device, pcm->id, pcm->name);
1165 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1166 snd_iprintf(buffer, " : playback %i",
1167 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1168 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1169 snd_iprintf(buffer, " : capture %i",
1170 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1171 snd_iprintf(buffer, "\n");
1172 }
1173 mutex_unlock(®ister_mutex);
1174}
1175
1176static struct snd_info_entry *snd_pcm_proc_entry;
1177
1178static void snd_pcm_proc_init(void)
1179{
1180 struct snd_info_entry *entry;
1181
1182 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1183 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1184 if (snd_info_register(entry) < 0) {
1185 snd_info_free_entry(entry);
1186 entry = NULL;
1187 }
1188 }
1189 snd_pcm_proc_entry = entry;
1190}
1191
1192static void snd_pcm_proc_done(void)
1193{
1194 snd_info_free_entry(snd_pcm_proc_entry);
1195}
1196
1197#else
1198#define snd_pcm_proc_init()
1199#define snd_pcm_proc_done()
1200#endif
1201
1202
1203
1204
1205
1206
1207static int __init alsa_pcm_init(void)
1208{
1209 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1210 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1211 snd_pcm_proc_init();
1212 return 0;
1213}
1214
1215static void __exit alsa_pcm_exit(void)
1216{
1217 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1218 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1219 snd_pcm_proc_done();
1220}
1221
1222module_init(alsa_pcm_init)
1223module_exit(alsa_pcm_exit)
1224
