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