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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 FORMAT(DSD_U8),
213 FORMAT(DSD_U16_LE),
214};
215
216const char *snd_pcm_format_name(snd_pcm_format_t format)
217{
218 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
219 return "Unknown";
220 return snd_pcm_format_names[(__force unsigned int)format];
221}
222EXPORT_SYMBOL_GPL(snd_pcm_format_name);
223
224#ifdef CONFIG_SND_VERBOSE_PROCFS
225
226#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
227#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
228#define READY(v) [SNDRV_PCM_READY_##v] = #v
229#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
230#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
231#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
232#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
233#define START(v) [SNDRV_PCM_START_##v] = #v
234#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
235
236static char *snd_pcm_stream_names[] = {
237 STREAM(PLAYBACK),
238 STREAM(CAPTURE),
239};
240
241static char *snd_pcm_state_names[] = {
242 STATE(OPEN),
243 STATE(SETUP),
244 STATE(PREPARED),
245 STATE(RUNNING),
246 STATE(XRUN),
247 STATE(DRAINING),
248 STATE(PAUSED),
249 STATE(SUSPENDED),
250};
251
252static char *snd_pcm_access_names[] = {
253 ACCESS(MMAP_INTERLEAVED),
254 ACCESS(MMAP_NONINTERLEAVED),
255 ACCESS(MMAP_COMPLEX),
256 ACCESS(RW_INTERLEAVED),
257 ACCESS(RW_NONINTERLEAVED),
258};
259
260static char *snd_pcm_subformat_names[] = {
261 SUBFORMAT(STD),
262};
263
264static char *snd_pcm_tstamp_mode_names[] = {
265 TSTAMP(NONE),
266 TSTAMP(ENABLE),
267};
268
269static const char *snd_pcm_stream_name(int stream)
270{
271 return snd_pcm_stream_names[stream];
272}
273
274static const char *snd_pcm_access_name(snd_pcm_access_t access)
275{
276 return snd_pcm_access_names[(__force int)access];
277}
278
279static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
280{
281 return snd_pcm_subformat_names[(__force int)subformat];
282}
283
284static const char *snd_pcm_tstamp_mode_name(int mode)
285{
286 return snd_pcm_tstamp_mode_names[mode];
287}
288
289static const char *snd_pcm_state_name(snd_pcm_state_t state)
290{
291 return snd_pcm_state_names[(__force int)state];
292}
293
294#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
295#include <linux/soundcard.h>
296
297static const char *snd_pcm_oss_format_name(int format)
298{
299 switch (format) {
300 case AFMT_MU_LAW:
301 return "MU_LAW";
302 case AFMT_A_LAW:
303 return "A_LAW";
304 case AFMT_IMA_ADPCM:
305 return "IMA_ADPCM";
306 case AFMT_U8:
307 return "U8";
308 case AFMT_S16_LE:
309 return "S16_LE";
310 case AFMT_S16_BE:
311 return "S16_BE";
312 case AFMT_S8:
313 return "S8";
314 case AFMT_U16_LE:
315 return "U16_LE";
316 case AFMT_U16_BE:
317 return "U16_BE";
318 case AFMT_MPEG:
319 return "MPEG";
320 default:
321 return "unknown";
322 }
323}
324#endif
325
326static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
327 struct snd_info_buffer *buffer)
328{
329 struct snd_pcm_info *info;
330 int err;
331
332 if (! substream)
333 return;
334
335 info = kmalloc(sizeof(*info), GFP_KERNEL);
336 if (! info) {
337 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
338 return;
339 }
340
341 err = snd_pcm_info(substream, info);
342 if (err < 0) {
343 snd_iprintf(buffer, "error %d\n", err);
344 kfree(info);
345 return;
346 }
347 snd_iprintf(buffer, "card: %d\n", info->card);
348 snd_iprintf(buffer, "device: %d\n", info->device);
349 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
350 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
351 snd_iprintf(buffer, "id: %s\n", info->id);
352 snd_iprintf(buffer, "name: %s\n", info->name);
353 snd_iprintf(buffer, "subname: %s\n", info->subname);
354 snd_iprintf(buffer, "class: %d\n", info->dev_class);
355 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
356 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
357 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
358 kfree(info);
359}
360
361static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
362 struct snd_info_buffer *buffer)
363{
364 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
365 buffer);
366}
367
368static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
369 struct snd_info_buffer *buffer)
370{
371 snd_pcm_proc_info_read(entry->private_data, buffer);
372}
373
374static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
375 struct snd_info_buffer *buffer)
376{
377 struct snd_pcm_substream *substream = entry->private_data;
378 struct snd_pcm_runtime *runtime;
379
380 mutex_lock(&substream->pcm->open_mutex);
381 runtime = substream->runtime;
382 if (!runtime) {
383 snd_iprintf(buffer, "closed\n");
384 goto unlock;
385 }
386 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
387 snd_iprintf(buffer, "no setup\n");
388 goto unlock;
389 }
390 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
391 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
392 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
393 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
394 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
395 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
396 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
397#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
398 if (substream->oss.oss) {
399 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
400 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
401 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
402 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
403 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
404 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
405 }
406#endif
407 unlock:
408 mutex_unlock(&substream->pcm->open_mutex);
409}
410
411static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
412 struct snd_info_buffer *buffer)
413{
414 struct snd_pcm_substream *substream = entry->private_data;
415 struct snd_pcm_runtime *runtime;
416
417 mutex_lock(&substream->pcm->open_mutex);
418 runtime = substream->runtime;
419 if (!runtime) {
420 snd_iprintf(buffer, "closed\n");
421 goto unlock;
422 }
423 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
424 snd_iprintf(buffer, "no setup\n");
425 goto unlock;
426 }
427 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
428 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
429 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
430 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
431 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
432 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
433 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
434 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
435 unlock:
436 mutex_unlock(&substream->pcm->open_mutex);
437}
438
439static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
440 struct snd_info_buffer *buffer)
441{
442 struct snd_pcm_substream *substream = entry->private_data;
443 struct snd_pcm_runtime *runtime;
444 struct snd_pcm_status status;
445 int err;
446
447 mutex_lock(&substream->pcm->open_mutex);
448 runtime = substream->runtime;
449 if (!runtime) {
450 snd_iprintf(buffer, "closed\n");
451 goto unlock;
452 }
453 memset(&status, 0, sizeof(status));
454 err = snd_pcm_status(substream, &status);
455 if (err < 0) {
456 snd_iprintf(buffer, "error %d\n", err);
457 goto unlock;
458 }
459 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
460 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
461 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
462 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
463 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
464 status.tstamp.tv_sec, status.tstamp.tv_nsec);
465 snd_iprintf(buffer, "delay : %ld\n", status.delay);
466 snd_iprintf(buffer, "avail : %ld\n", status.avail);
467 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
468 snd_iprintf(buffer, "-----\n");
469 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
470 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
471 unlock:
472 mutex_unlock(&substream->pcm->open_mutex);
473}
474
475#ifdef CONFIG_SND_PCM_XRUN_DEBUG
476static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
477 struct snd_info_buffer *buffer)
478{
479 struct snd_pcm_str *pstr = entry->private_data;
480 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
481}
482
483static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
484 struct snd_info_buffer *buffer)
485{
486 struct snd_pcm_str *pstr = entry->private_data;
487 char line[64];
488 if (!snd_info_get_line(buffer, line, sizeof(line)))
489 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
490}
491#endif
492
493static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
494{
495 struct snd_pcm *pcm = pstr->pcm;
496 struct snd_info_entry *entry;
497 char name[16];
498
499 sprintf(name, "pcm%i%c", pcm->device,
500 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
501 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
502 return -ENOMEM;
503 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
504 if (snd_info_register(entry) < 0) {
505 snd_info_free_entry(entry);
506 return -ENOMEM;
507 }
508 pstr->proc_root = entry;
509
510 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
511 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
512 if (snd_info_register(entry) < 0) {
513 snd_info_free_entry(entry);
514 entry = NULL;
515 }
516 }
517 pstr->proc_info_entry = entry;
518
519#ifdef CONFIG_SND_PCM_XRUN_DEBUG
520 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
521 pstr->proc_root)) != NULL) {
522 entry->c.text.read = snd_pcm_xrun_debug_read;
523 entry->c.text.write = snd_pcm_xrun_debug_write;
524 entry->mode |= S_IWUSR;
525 entry->private_data = pstr;
526 if (snd_info_register(entry) < 0) {
527 snd_info_free_entry(entry);
528 entry = NULL;
529 }
530 }
531 pstr->proc_xrun_debug_entry = entry;
532#endif
533 return 0;
534}
535
536static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
537{
538#ifdef CONFIG_SND_PCM_XRUN_DEBUG
539 snd_info_free_entry(pstr->proc_xrun_debug_entry);
540 pstr->proc_xrun_debug_entry = NULL;
541#endif
542 snd_info_free_entry(pstr->proc_info_entry);
543 pstr->proc_info_entry = NULL;
544 snd_info_free_entry(pstr->proc_root);
545 pstr->proc_root = NULL;
546 return 0;
547}
548
549static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
550{
551 struct snd_info_entry *entry;
552 struct snd_card *card;
553 char name[16];
554
555 card = substream->pcm->card;
556
557 sprintf(name, "sub%i", substream->number);
558 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
559 return -ENOMEM;
560 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
561 if (snd_info_register(entry) < 0) {
562 snd_info_free_entry(entry);
563 return -ENOMEM;
564 }
565 substream->proc_root = entry;
566
567 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
568 snd_info_set_text_ops(entry, substream,
569 snd_pcm_substream_proc_info_read);
570 if (snd_info_register(entry) < 0) {
571 snd_info_free_entry(entry);
572 entry = NULL;
573 }
574 }
575 substream->proc_info_entry = entry;
576
577 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
578 snd_info_set_text_ops(entry, substream,
579 snd_pcm_substream_proc_hw_params_read);
580 if (snd_info_register(entry) < 0) {
581 snd_info_free_entry(entry);
582 entry = NULL;
583 }
584 }
585 substream->proc_hw_params_entry = entry;
586
587 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
588 snd_info_set_text_ops(entry, substream,
589 snd_pcm_substream_proc_sw_params_read);
590 if (snd_info_register(entry) < 0) {
591 snd_info_free_entry(entry);
592 entry = NULL;
593 }
594 }
595 substream->proc_sw_params_entry = entry;
596
597 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
598 snd_info_set_text_ops(entry, substream,
599 snd_pcm_substream_proc_status_read);
600 if (snd_info_register(entry) < 0) {
601 snd_info_free_entry(entry);
602 entry = NULL;
603 }
604 }
605 substream->proc_status_entry = entry;
606
607 return 0;
608}
609
610static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
611{
612 snd_info_free_entry(substream->proc_info_entry);
613 substream->proc_info_entry = NULL;
614 snd_info_free_entry(substream->proc_hw_params_entry);
615 substream->proc_hw_params_entry = NULL;
616 snd_info_free_entry(substream->proc_sw_params_entry);
617 substream->proc_sw_params_entry = NULL;
618 snd_info_free_entry(substream->proc_status_entry);
619 substream->proc_status_entry = NULL;
620 snd_info_free_entry(substream->proc_root);
621 substream->proc_root = NULL;
622 return 0;
623}
624#else
625static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
626static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
627static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
628static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
629#endif
630
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643
644int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
645{
646 int idx, err;
647 struct snd_pcm_str *pstr = &pcm->streams[stream];
648 struct snd_pcm_substream *substream, *prev;
649
650#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
651 mutex_init(&pstr->oss.setup_mutex);
652#endif
653 pstr->stream = stream;
654 pstr->pcm = pcm;
655 pstr->substream_count = substream_count;
656 if (substream_count > 0 && !pcm->internal) {
657 err = snd_pcm_stream_proc_init(pstr);
658 if (err < 0) {
659 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
660 return err;
661 }
662 }
663 prev = NULL;
664 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
665 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
666 if (substream == NULL) {
667 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
668 return -ENOMEM;
669 }
670 substream->pcm = pcm;
671 substream->pstr = pstr;
672 substream->number = idx;
673 substream->stream = stream;
674 sprintf(substream->name, "subdevice #%i", idx);
675 substream->buffer_bytes_max = UINT_MAX;
676 if (prev == NULL)
677 pstr->substream = substream;
678 else
679 prev->next = substream;
680
681 if (!pcm->internal) {
682 err = snd_pcm_substream_proc_init(substream);
683 if (err < 0) {
684 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
685 if (prev == NULL)
686 pstr->substream = NULL;
687 else
688 prev->next = NULL;
689 kfree(substream);
690 return err;
691 }
692 }
693 substream->group = &substream->self_group;
694 spin_lock_init(&substream->self_group.lock);
695 INIT_LIST_HEAD(&substream->self_group.substreams);
696 list_add_tail(&substream->link_list, &substream->self_group.substreams);
697 atomic_set(&substream->mmap_count, 0);
698 prev = substream;
699 }
700 return 0;
701}
702
703EXPORT_SYMBOL(snd_pcm_new_stream);
704
705static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
706 int playback_count, int capture_count, bool internal,
707 struct snd_pcm **rpcm)
708{
709 struct snd_pcm *pcm;
710 int err;
711 static struct snd_device_ops ops = {
712 .dev_free = snd_pcm_dev_free,
713 .dev_register = snd_pcm_dev_register,
714 .dev_disconnect = snd_pcm_dev_disconnect,
715 };
716
717 if (snd_BUG_ON(!card))
718 return -ENXIO;
719 if (rpcm)
720 *rpcm = NULL;
721 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
722 if (pcm == NULL) {
723 snd_printk(KERN_ERR "Cannot allocate PCM\n");
724 return -ENOMEM;
725 }
726 pcm->card = card;
727 pcm->device = device;
728 pcm->internal = internal;
729 if (id)
730 strlcpy(pcm->id, id, sizeof(pcm->id));
731 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
732 snd_pcm_free(pcm);
733 return err;
734 }
735 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
736 snd_pcm_free(pcm);
737 return err;
738 }
739 mutex_init(&pcm->open_mutex);
740 init_waitqueue_head(&pcm->open_wait);
741 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
742 snd_pcm_free(pcm);
743 return err;
744 }
745 if (rpcm)
746 *rpcm = pcm;
747 return 0;
748}
749
750
751
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754
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764
765
766int snd_pcm_new(struct snd_card *card, const char *id, int device,
767 int playback_count, int capture_count, struct snd_pcm **rpcm)
768{
769 return _snd_pcm_new(card, id, device, playback_count, capture_count,
770 false, rpcm);
771}
772EXPORT_SYMBOL(snd_pcm_new);
773
774
775
776
777
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784
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793
794int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
795 int playback_count, int capture_count,
796 struct snd_pcm **rpcm)
797{
798 return _snd_pcm_new(card, id, device, playback_count, capture_count,
799 true, rpcm);
800}
801EXPORT_SYMBOL(snd_pcm_new_internal);
802
803static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
804{
805 struct snd_pcm_substream *substream, *substream_next;
806#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
807 struct snd_pcm_oss_setup *setup, *setupn;
808#endif
809 substream = pstr->substream;
810 while (substream) {
811 substream_next = substream->next;
812 snd_pcm_timer_done(substream);
813 snd_pcm_substream_proc_done(substream);
814 kfree(substream);
815 substream = substream_next;
816 }
817 snd_pcm_stream_proc_done(pstr);
818#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
819 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
820 setupn = setup->next;
821 kfree(setup->task_name);
822 kfree(setup);
823 }
824#endif
825}
826
827static int snd_pcm_free(struct snd_pcm *pcm)
828{
829 struct snd_pcm_notify *notify;
830
831 if (!pcm)
832 return 0;
833 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
834 notify->n_unregister(pcm);
835 }
836 if (pcm->private_free)
837 pcm->private_free(pcm);
838 snd_pcm_lib_preallocate_free_for_all(pcm);
839 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
840 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
841 kfree(pcm);
842 return 0;
843}
844
845static int snd_pcm_dev_free(struct snd_device *device)
846{
847 struct snd_pcm *pcm = device->device_data;
848 return snd_pcm_free(pcm);
849}
850
851int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
852 struct file *file,
853 struct snd_pcm_substream **rsubstream)
854{
855 struct snd_pcm_str * pstr;
856 struct snd_pcm_substream *substream;
857 struct snd_pcm_runtime *runtime;
858 struct snd_ctl_file *kctl;
859 struct snd_card *card;
860 int prefer_subdevice = -1;
861 size_t size;
862
863 if (snd_BUG_ON(!pcm || !rsubstream))
864 return -ENXIO;
865 *rsubstream = NULL;
866 pstr = &pcm->streams[stream];
867 if (pstr->substream == NULL || pstr->substream_count == 0)
868 return -ENODEV;
869
870 card = pcm->card;
871 read_lock(&card->ctl_files_rwlock);
872 list_for_each_entry(kctl, &card->ctl_files, list) {
873 if (kctl->pid == task_pid(current)) {
874 prefer_subdevice = kctl->prefer_pcm_subdevice;
875 if (prefer_subdevice != -1)
876 break;
877 }
878 }
879 read_unlock(&card->ctl_files_rwlock);
880
881 switch (stream) {
882 case SNDRV_PCM_STREAM_PLAYBACK:
883 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
884 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
885 if (SUBSTREAM_BUSY(substream))
886 return -EAGAIN;
887 }
888 }
889 break;
890 case SNDRV_PCM_STREAM_CAPTURE:
891 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
892 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
893 if (SUBSTREAM_BUSY(substream))
894 return -EAGAIN;
895 }
896 }
897 break;
898 default:
899 return -EINVAL;
900 }
901
902 if (file->f_flags & O_APPEND) {
903 if (prefer_subdevice < 0) {
904 if (pstr->substream_count > 1)
905 return -EINVAL;
906 substream = pstr->substream;
907 } else {
908 for (substream = pstr->substream; substream;
909 substream = substream->next)
910 if (substream->number == prefer_subdevice)
911 break;
912 }
913 if (! substream)
914 return -ENODEV;
915 if (! SUBSTREAM_BUSY(substream))
916 return -EBADFD;
917 substream->ref_count++;
918 *rsubstream = substream;
919 return 0;
920 }
921
922 if (prefer_subdevice >= 0) {
923 for (substream = pstr->substream; substream; substream = substream->next)
924 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
925 goto __ok;
926 }
927 for (substream = pstr->substream; substream; substream = substream->next)
928 if (!SUBSTREAM_BUSY(substream))
929 break;
930 __ok:
931 if (substream == NULL)
932 return -EAGAIN;
933
934 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
935 if (runtime == NULL)
936 return -ENOMEM;
937
938 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
939 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
940 if (runtime->status == NULL) {
941 kfree(runtime);
942 return -ENOMEM;
943 }
944 memset((void*)runtime->status, 0, size);
945
946 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
947 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
948 if (runtime->control == NULL) {
949 snd_free_pages((void*)runtime->status,
950 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
951 kfree(runtime);
952 return -ENOMEM;
953 }
954 memset((void*)runtime->control, 0, size);
955
956 init_waitqueue_head(&runtime->sleep);
957 init_waitqueue_head(&runtime->tsleep);
958
959 runtime->status->state = SNDRV_PCM_STATE_OPEN;
960
961 substream->runtime = runtime;
962 substream->private_data = pcm->private_data;
963 substream->ref_count = 1;
964 substream->f_flags = file->f_flags;
965 substream->pid = get_pid(task_pid(current));
966 pstr->substream_opened++;
967 *rsubstream = substream;
968 return 0;
969}
970
971void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
972{
973 struct snd_pcm_runtime *runtime;
974
975 if (PCM_RUNTIME_CHECK(substream))
976 return;
977 runtime = substream->runtime;
978 if (runtime->private_free != NULL)
979 runtime->private_free(runtime);
980 snd_free_pages((void*)runtime->status,
981 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
982 snd_free_pages((void*)runtime->control,
983 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
984 kfree(runtime->hw_constraints.rules);
985#ifdef CONFIG_SND_PCM_XRUN_DEBUG
986 kfree(runtime->hwptr_log);
987#endif
988 kfree(runtime);
989 substream->runtime = NULL;
990 put_pid(substream->pid);
991 substream->pid = NULL;
992 substream->pstr->substream_opened--;
993}
994
995static ssize_t show_pcm_class(struct device *dev,
996 struct device_attribute *attr, char *buf)
997{
998 struct snd_pcm *pcm;
999 const char *str;
1000 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1001 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1002 [SNDRV_PCM_CLASS_MULTI] = "multi",
1003 [SNDRV_PCM_CLASS_MODEM] = "modem",
1004 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1005 };
1006
1007 if (! (pcm = dev_get_drvdata(dev)) ||
1008 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1009 str = "none";
1010 else
1011 str = strs[pcm->dev_class];
1012 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1013}
1014
1015static struct device_attribute pcm_attrs =
1016 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1017
1018static int snd_pcm_dev_register(struct snd_device *device)
1019{
1020 int cidx, err;
1021 struct snd_pcm_substream *substream;
1022 struct snd_pcm_notify *notify;
1023 char str[16];
1024 struct snd_pcm *pcm;
1025 struct device *dev;
1026
1027 if (snd_BUG_ON(!device || !device->device_data))
1028 return -ENXIO;
1029 pcm = device->device_data;
1030 mutex_lock(®ister_mutex);
1031 err = snd_pcm_add(pcm);
1032 if (err) {
1033 mutex_unlock(®ister_mutex);
1034 return err;
1035 }
1036 for (cidx = 0; cidx < 2; cidx++) {
1037 int devtype = -1;
1038 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1039 continue;
1040 switch (cidx) {
1041 case SNDRV_PCM_STREAM_PLAYBACK:
1042 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1043 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1044 break;
1045 case SNDRV_PCM_STREAM_CAPTURE:
1046 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1047 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1048 break;
1049 }
1050
1051
1052
1053 dev = pcm->dev;
1054 if (!dev)
1055 dev = snd_card_get_device_link(pcm->card);
1056
1057 err = snd_register_device_for_dev(devtype, pcm->card,
1058 pcm->device,
1059 &snd_pcm_f_ops[cidx],
1060 pcm, str, dev);
1061 if (err < 0) {
1062 list_del(&pcm->list);
1063 mutex_unlock(®ister_mutex);
1064 return err;
1065 }
1066 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1067 &pcm_attrs);
1068 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1069 snd_pcm_timer_init(substream);
1070 }
1071
1072 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1073 notify->n_register(pcm);
1074
1075 mutex_unlock(®ister_mutex);
1076 return 0;
1077}
1078
1079static int snd_pcm_dev_disconnect(struct snd_device *device)
1080{
1081 struct snd_pcm *pcm = device->device_data;
1082 struct snd_pcm_notify *notify;
1083 struct snd_pcm_substream *substream;
1084 int cidx, devtype;
1085
1086 mutex_lock(®ister_mutex);
1087 if (list_empty(&pcm->list))
1088 goto unlock;
1089
1090 mutex_lock(&pcm->open_mutex);
1091 wake_up(&pcm->open_wait);
1092 list_del_init(&pcm->list);
1093 for (cidx = 0; cidx < 2; cidx++)
1094 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1095 snd_pcm_stream_lock_irq(substream);
1096 if (substream->runtime) {
1097 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1098 wake_up(&substream->runtime->sleep);
1099 wake_up(&substream->runtime->tsleep);
1100 }
1101 snd_pcm_stream_unlock_irq(substream);
1102 }
1103 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1104 notify->n_disconnect(pcm);
1105 }
1106 for (cidx = 0; cidx < 2; cidx++) {
1107 devtype = -1;
1108 switch (cidx) {
1109 case SNDRV_PCM_STREAM_PLAYBACK:
1110 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1111 break;
1112 case SNDRV_PCM_STREAM_CAPTURE:
1113 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1114 break;
1115 }
1116 snd_unregister_device(devtype, pcm->card, pcm->device);
1117 if (pcm->streams[cidx].chmap_kctl) {
1118 snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1119 pcm->streams[cidx].chmap_kctl = NULL;
1120 }
1121 }
1122 mutex_unlock(&pcm->open_mutex);
1123 unlock:
1124 mutex_unlock(®ister_mutex);
1125 return 0;
1126}
1127
1128int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1129{
1130 struct snd_pcm *pcm;
1131
1132 if (snd_BUG_ON(!notify ||
1133 !notify->n_register ||
1134 !notify->n_unregister ||
1135 !notify->n_disconnect))
1136 return -EINVAL;
1137 mutex_lock(®ister_mutex);
1138 if (nfree) {
1139 list_del(¬ify->list);
1140 list_for_each_entry(pcm, &snd_pcm_devices, list)
1141 notify->n_unregister(pcm);
1142 } else {
1143 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1144 list_for_each_entry(pcm, &snd_pcm_devices, list)
1145 notify->n_register(pcm);
1146 }
1147 mutex_unlock(®ister_mutex);
1148 return 0;
1149}
1150
1151EXPORT_SYMBOL(snd_pcm_notify);
1152
1153#ifdef CONFIG_PROC_FS
1154
1155
1156
1157
1158static void snd_pcm_proc_read(struct snd_info_entry *entry,
1159 struct snd_info_buffer *buffer)
1160{
1161 struct snd_pcm *pcm;
1162
1163 mutex_lock(®ister_mutex);
1164 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1165 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1166 pcm->card->number, pcm->device, pcm->id, pcm->name);
1167 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1168 snd_iprintf(buffer, " : playback %i",
1169 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1170 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1171 snd_iprintf(buffer, " : capture %i",
1172 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1173 snd_iprintf(buffer, "\n");
1174 }
1175 mutex_unlock(®ister_mutex);
1176}
1177
1178static struct snd_info_entry *snd_pcm_proc_entry;
1179
1180static void snd_pcm_proc_init(void)
1181{
1182 struct snd_info_entry *entry;
1183
1184 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1185 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1186 if (snd_info_register(entry) < 0) {
1187 snd_info_free_entry(entry);
1188 entry = NULL;
1189 }
1190 }
1191 snd_pcm_proc_entry = entry;
1192}
1193
1194static void snd_pcm_proc_done(void)
1195{
1196 snd_info_free_entry(snd_pcm_proc_entry);
1197}
1198
1199#else
1200#define snd_pcm_proc_init()
1201#define snd_pcm_proc_done()
1202#endif
1203
1204
1205
1206
1207
1208
1209static int __init alsa_pcm_init(void)
1210{
1211 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1212 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1213 snd_pcm_proc_init();
1214 return 0;
1215}
1216
1217static void __exit alsa_pcm_exit(void)
1218{
1219 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1220 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1221 snd_pcm_proc_done();
1222}
1223
1224module_init(alsa_pcm_init)
1225module_exit(alsa_pcm_exit)
1226
