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