1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/time.h>
25#include <linux/mutex.h>
26#include <sound/core.h>
27#include <sound/minors.h>
28#include <sound/pcm.h>
29#include <sound/control.h>
30#include <sound/info.h>
31
32MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34MODULE_LICENSE("GPL");
35
36static LIST_HEAD(snd_pcm_devices);
37static LIST_HEAD(snd_pcm_notify_list);
38static DEFINE_MUTEX(register_mutex);
39
40static int snd_pcm_free(struct snd_pcm *pcm);
41static int snd_pcm_dev_free(struct snd_device *device);
42static int snd_pcm_dev_register(struct snd_device *device);
43static int snd_pcm_dev_disconnect(struct snd_device *device);
44
45static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
46{
47 struct snd_pcm *pcm;
48
49 list_for_each_entry(pcm, &snd_pcm_devices, list) {
50 if (pcm->card == card && pcm->device == device)
51 return pcm;
52 }
53 return NULL;
54}
55
56static int snd_pcm_next(struct snd_card *card, int device)
57{
58 struct snd_pcm *pcm;
59
60 list_for_each_entry(pcm, &snd_pcm_devices, list) {
61 if (pcm->card == card && pcm->device > device)
62 return pcm->device;
63 else if (pcm->card->number > card->number)
64 return -1;
65 }
66 return -1;
67}
68
69static int snd_pcm_add(struct snd_pcm *newpcm)
70{
71 struct snd_pcm *pcm;
72
73 list_for_each_entry(pcm, &snd_pcm_devices, list) {
74 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
75 return -EBUSY;
76 if (pcm->card->number > newpcm->card->number ||
77 (pcm->card == newpcm->card &&
78 pcm->device > newpcm->device)) {
79 list_add(&newpcm->list, pcm->list.prev);
80 return 0;
81 }
82 }
83 list_add_tail(&newpcm->list, &snd_pcm_devices);
84 return 0;
85}
86
87static int snd_pcm_control_ioctl(struct snd_card *card,
88 struct snd_ctl_file *control,
89 unsigned int cmd, unsigned long arg)
90{
91 switch (cmd) {
92 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
93 {
94 int device;
95
96 if (get_user(device, (int __user *)arg))
97 return -EFAULT;
98 mutex_lock(®ister_mutex);
99 device = snd_pcm_next(card, device);
100 mutex_unlock(®ister_mutex);
101 if (put_user(device, (int __user *)arg))
102 return -EFAULT;
103 return 0;
104 }
105 case SNDRV_CTL_IOCTL_PCM_INFO:
106 {
107 struct snd_pcm_info __user *info;
108 unsigned int device, subdevice;
109 int stream;
110 struct snd_pcm *pcm;
111 struct snd_pcm_str *pstr;
112 struct snd_pcm_substream *substream;
113 int err;
114
115 info = (struct snd_pcm_info __user *)arg;
116 if (get_user(device, &info->device))
117 return -EFAULT;
118 if (get_user(stream, &info->stream))
119 return -EFAULT;
120 if (stream < 0 || stream > 1)
121 return -EINVAL;
122 if (get_user(subdevice, &info->subdevice))
123 return -EFAULT;
124 mutex_lock(®ister_mutex);
125 pcm = snd_pcm_get(card, device);
126 if (pcm == NULL) {
127 err = -ENXIO;
128 goto _error;
129 }
130 pstr = &pcm->streams[stream];
131 if (pstr->substream_count == 0) {
132 err = -ENOENT;
133 goto _error;
134 }
135 if (subdevice >= pstr->substream_count) {
136 err = -ENXIO;
137 goto _error;
138 }
139 for (substream = pstr->substream; substream;
140 substream = substream->next)
141 if (substream->number == (int)subdevice)
142 break;
143 if (substream == NULL) {
144 err = -ENXIO;
145 goto _error;
146 }
147 err = snd_pcm_info_user(substream, info);
148 _error:
149 mutex_unlock(®ister_mutex);
150 return err;
151 }
152 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
153 {
154 int val;
155
156 if (get_user(val, (int __user *)arg))
157 return -EFAULT;
158 control->prefer_pcm_subdevice = val;
159 return 0;
160 }
161 }
162 return -ENOIOCTLCMD;
163}
164
165#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
166
167static char *snd_pcm_format_names[] = {
168 FORMAT(S8),
169 FORMAT(U8),
170 FORMAT(S16_LE),
171 FORMAT(S16_BE),
172 FORMAT(U16_LE),
173 FORMAT(U16_BE),
174 FORMAT(S24_LE),
175 FORMAT(S24_BE),
176 FORMAT(U24_LE),
177 FORMAT(U24_BE),
178 FORMAT(S32_LE),
179 FORMAT(S32_BE),
180 FORMAT(U32_LE),
181 FORMAT(U32_BE),
182 FORMAT(FLOAT_LE),
183 FORMAT(FLOAT_BE),
184 FORMAT(FLOAT64_LE),
185 FORMAT(FLOAT64_BE),
186 FORMAT(IEC958_SUBFRAME_LE),
187 FORMAT(IEC958_SUBFRAME_BE),
188 FORMAT(MU_LAW),
189 FORMAT(A_LAW),
190 FORMAT(IMA_ADPCM),
191 FORMAT(MPEG),
192 FORMAT(GSM),
193 FORMAT(SPECIAL),
194 FORMAT(S24_3LE),
195 FORMAT(S24_3BE),
196 FORMAT(U24_3LE),
197 FORMAT(U24_3BE),
198 FORMAT(S20_3LE),
199 FORMAT(S20_3BE),
200 FORMAT(U20_3LE),
201 FORMAT(U20_3BE),
202 FORMAT(S18_3LE),
203 FORMAT(S18_3BE),
204 FORMAT(U18_3LE),
205 FORMAT(U18_3BE),
206};
207
208const char *snd_pcm_format_name(snd_pcm_format_t format)
209{
210 return snd_pcm_format_names[format];
211}
212EXPORT_SYMBOL_GPL(snd_pcm_format_name);
213
214#ifdef CONFIG_SND_VERBOSE_PROCFS
215
216#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
217#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
218#define READY(v) [SNDRV_PCM_READY_##v] = #v
219#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
220#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
221#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
222#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
223#define START(v) [SNDRV_PCM_START_##v] = #v
224#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
225
226static char *snd_pcm_stream_names[] = {
227 STREAM(PLAYBACK),
228 STREAM(CAPTURE),
229};
230
231static char *snd_pcm_state_names[] = {
232 STATE(OPEN),
233 STATE(SETUP),
234 STATE(PREPARED),
235 STATE(RUNNING),
236 STATE(XRUN),
237 STATE(DRAINING),
238 STATE(PAUSED),
239 STATE(SUSPENDED),
240};
241
242static char *snd_pcm_access_names[] = {
243 ACCESS(MMAP_INTERLEAVED),
244 ACCESS(MMAP_NONINTERLEAVED),
245 ACCESS(MMAP_COMPLEX),
246 ACCESS(RW_INTERLEAVED),
247 ACCESS(RW_NONINTERLEAVED),
248};
249
250static char *snd_pcm_subformat_names[] = {
251 SUBFORMAT(STD),
252};
253
254static char *snd_pcm_tstamp_mode_names[] = {
255 TSTAMP(NONE),
256 TSTAMP(ENABLE),
257};
258
259static const char *snd_pcm_stream_name(int stream)
260{
261 return snd_pcm_stream_names[stream];
262}
263
264static const char *snd_pcm_access_name(snd_pcm_access_t access)
265{
266 return snd_pcm_access_names[access];
267}
268
269static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
270{
271 return snd_pcm_subformat_names[subformat];
272}
273
274static const char *snd_pcm_tstamp_mode_name(int mode)
275{
276 return snd_pcm_tstamp_mode_names[mode];
277}
278
279static const char *snd_pcm_state_name(snd_pcm_state_t state)
280{
281 return snd_pcm_state_names[state];
282}
283
284#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
285#include <linux/soundcard.h>
286
287static const char *snd_pcm_oss_format_name(int format)
288{
289 switch (format) {
290 case AFMT_MU_LAW:
291 return "MU_LAW";
292 case AFMT_A_LAW:
293 return "A_LAW";
294 case AFMT_IMA_ADPCM:
295 return "IMA_ADPCM";
296 case AFMT_U8:
297 return "U8";
298 case AFMT_S16_LE:
299 return "S16_LE";
300 case AFMT_S16_BE:
301 return "S16_BE";
302 case AFMT_S8:
303 return "S8";
304 case AFMT_U16_LE:
305 return "U16_LE";
306 case AFMT_U16_BE:
307 return "U16_BE";
308 case AFMT_MPEG:
309 return "MPEG";
310 default:
311 return "unknown";
312 }
313}
314#endif
315
316static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
317 struct snd_info_buffer *buffer)
318{
319 struct snd_pcm_info *info;
320 int err;
321
322 if (! substream)
323 return;
324
325 info = kmalloc(sizeof(*info), GFP_KERNEL);
326 if (! info) {
327 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
328 return;
329 }
330
331 err = snd_pcm_info(substream, info);
332 if (err < 0) {
333 snd_iprintf(buffer, "error %d\n", err);
334 kfree(info);
335 return;
336 }
337 snd_iprintf(buffer, "card: %d\n", info->card);
338 snd_iprintf(buffer, "device: %d\n", info->device);
339 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
340 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
341 snd_iprintf(buffer, "id: %s\n", info->id);
342 snd_iprintf(buffer, "name: %s\n", info->name);
343 snd_iprintf(buffer, "subname: %s\n", info->subname);
344 snd_iprintf(buffer, "class: %d\n", info->dev_class);
345 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
346 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
347 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
348 kfree(info);
349}
350
351static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
352 struct snd_info_buffer *buffer)
353{
354 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
355 buffer);
356}
357
358static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
359 struct snd_info_buffer *buffer)
360{
361 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
362 buffer);
363}
364
365static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
366 struct snd_info_buffer *buffer)
367{
368 struct snd_pcm_substream *substream = entry->private_data;
369 struct snd_pcm_runtime *runtime = substream->runtime;
370 if (!runtime) {
371 snd_iprintf(buffer, "closed\n");
372 return;
373 }
374 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
375 snd_iprintf(buffer, "no setup\n");
376 return;
377 }
378 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
379 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
380 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
381 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
382 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
383 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
384 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
385#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
386 if (substream->oss.oss) {
387 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
388 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
389 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
390 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
391 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
392 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
393 }
394#endif
395}
396
397static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
398 struct snd_info_buffer *buffer)
399{
400 struct snd_pcm_substream *substream = entry->private_data;
401 struct snd_pcm_runtime *runtime = substream->runtime;
402 if (!runtime) {
403 snd_iprintf(buffer, "closed\n");
404 return;
405 }
406 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
407 snd_iprintf(buffer, "no setup\n");
408 return;
409 }
410 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
411 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
412 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
413 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
414 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
415 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
416 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
417 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
418}
419
420static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
421 struct snd_info_buffer *buffer)
422{
423 struct snd_pcm_substream *substream = entry->private_data;
424 struct snd_pcm_runtime *runtime = substream->runtime;
425 struct snd_pcm_status status;
426 int err;
427 if (!runtime) {
428 snd_iprintf(buffer, "closed\n");
429 return;
430 }
431 memset(&status, 0, sizeof(status));
432 err = snd_pcm_status(substream, &status);
433 if (err < 0) {
434 snd_iprintf(buffer, "error %d\n", err);
435 return;
436 }
437 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
438 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
439 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
440 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
441 status.tstamp.tv_sec, status.tstamp.tv_nsec);
442 snd_iprintf(buffer, "delay : %ld\n", status.delay);
443 snd_iprintf(buffer, "avail : %ld\n", status.avail);
444 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
445 snd_iprintf(buffer, "-----\n");
446 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
447 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
448}
449
450#ifdef CONFIG_SND_PCM_XRUN_DEBUG
451static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
452 struct snd_info_buffer *buffer)
453{
454 struct snd_pcm_str *pstr = entry->private_data;
455 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
456}
457
458static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
459 struct snd_info_buffer *buffer)
460{
461 struct snd_pcm_str *pstr = entry->private_data;
462 char line[64];
463 if (!snd_info_get_line(buffer, line, sizeof(line)))
464 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
465}
466#endif
467
468static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
469{
470 struct snd_pcm *pcm = pstr->pcm;
471 struct snd_info_entry *entry;
472 char name[16];
473
474 sprintf(name, "pcm%i%c", pcm->device,
475 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
476 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
477 return -ENOMEM;
478 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
479 if (snd_info_register(entry) < 0) {
480 snd_info_free_entry(entry);
481 return -ENOMEM;
482 }
483 pstr->proc_root = entry;
484
485 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
486 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
487 if (snd_info_register(entry) < 0) {
488 snd_info_free_entry(entry);
489 entry = NULL;
490 }
491 }
492 pstr->proc_info_entry = entry;
493
494#ifdef CONFIG_SND_PCM_XRUN_DEBUG
495 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
496 pstr->proc_root)) != NULL) {
497 entry->c.text.read = snd_pcm_xrun_debug_read;
498 entry->c.text.write = snd_pcm_xrun_debug_write;
499 entry->mode |= S_IWUSR;
500 entry->private_data = pstr;
501 if (snd_info_register(entry) < 0) {
502 snd_info_free_entry(entry);
503 entry = NULL;
504 }
505 }
506 pstr->proc_xrun_debug_entry = entry;
507#endif
508 return 0;
509}
510
511static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
512{
513#ifdef CONFIG_SND_PCM_XRUN_DEBUG
514 snd_info_free_entry(pstr->proc_xrun_debug_entry);
515 pstr->proc_xrun_debug_entry = NULL;
516#endif
517 snd_info_free_entry(pstr->proc_info_entry);
518 pstr->proc_info_entry = NULL;
519 snd_info_free_entry(pstr->proc_root);
520 pstr->proc_root = NULL;
521 return 0;
522}
523
524static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
525{
526 struct snd_info_entry *entry;
527 struct snd_card *card;
528 char name[16];
529
530 card = substream->pcm->card;
531
532 sprintf(name, "sub%i", substream->number);
533 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
534 return -ENOMEM;
535 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
536 if (snd_info_register(entry) < 0) {
537 snd_info_free_entry(entry);
538 return -ENOMEM;
539 }
540 substream->proc_root = entry;
541
542 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
543 snd_info_set_text_ops(entry, substream,
544 snd_pcm_substream_proc_info_read);
545 if (snd_info_register(entry) < 0) {
546 snd_info_free_entry(entry);
547 entry = NULL;
548 }
549 }
550 substream->proc_info_entry = entry;
551
552 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
553 snd_info_set_text_ops(entry, substream,
554 snd_pcm_substream_proc_hw_params_read);
555 if (snd_info_register(entry) < 0) {
556 snd_info_free_entry(entry);
557 entry = NULL;
558 }
559 }
560 substream->proc_hw_params_entry = entry;
561
562 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
563 snd_info_set_text_ops(entry, substream,
564 snd_pcm_substream_proc_sw_params_read);
565 if (snd_info_register(entry) < 0) {
566 snd_info_free_entry(entry);
567 entry = NULL;
568 }
569 }
570 substream->proc_sw_params_entry = entry;
571
572 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
573 snd_info_set_text_ops(entry, substream,
574 snd_pcm_substream_proc_status_read);
575 if (snd_info_register(entry) < 0) {
576 snd_info_free_entry(entry);
577 entry = NULL;
578 }
579 }
580 substream->proc_status_entry = entry;
581
582 return 0;
583}
584
585static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
586{
587 snd_info_free_entry(substream->proc_info_entry);
588 substream->proc_info_entry = NULL;
589 snd_info_free_entry(substream->proc_hw_params_entry);
590 substream->proc_hw_params_entry = NULL;
591 snd_info_free_entry(substream->proc_sw_params_entry);
592 substream->proc_sw_params_entry = NULL;
593 snd_info_free_entry(substream->proc_status_entry);
594 substream->proc_status_entry = NULL;
595 snd_info_free_entry(substream->proc_root);
596 substream->proc_root = NULL;
597 return 0;
598}
599#else
600static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
601static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
602static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
603static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
604#endif
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
620{
621 int idx, err;
622 struct snd_pcm_str *pstr = &pcm->streams[stream];
623 struct snd_pcm_substream *substream, *prev;
624
625#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
626 mutex_init(&pstr->oss.setup_mutex);
627#endif
628 pstr->stream = stream;
629 pstr->pcm = pcm;
630 pstr->substream_count = substream_count;
631 if (substream_count > 0) {
632 err = snd_pcm_stream_proc_init(pstr);
633 if (err < 0) {
634 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
635 return err;
636 }
637 }
638 prev = NULL;
639 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
640 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
641 if (substream == NULL) {
642 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
643 return -ENOMEM;
644 }
645 substream->pcm = pcm;
646 substream->pstr = pstr;
647 substream->number = idx;
648 substream->stream = stream;
649 sprintf(substream->name, "subdevice #%i", idx);
650 snprintf(substream->latency_id, sizeof(substream->latency_id),
651 "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
652 (stream ? 'c' : 'p'), idx);
653 substream->buffer_bytes_max = UINT_MAX;
654 if (prev == NULL)
655 pstr->substream = substream;
656 else
657 prev->next = substream;
658 err = snd_pcm_substream_proc_init(substream);
659 if (err < 0) {
660 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
661 if (prev == NULL)
662 pstr->substream = NULL;
663 else
664 prev->next = NULL;
665 kfree(substream);
666 return err;
667 }
668 substream->group = &substream->self_group;
669 spin_lock_init(&substream->self_group.lock);
670 INIT_LIST_HEAD(&substream->self_group.substreams);
671 list_add_tail(&substream->link_list, &substream->self_group.substreams);
672 atomic_set(&substream->mmap_count, 0);
673 prev = substream;
674 }
675 return 0;
676}
677
678EXPORT_SYMBOL(snd_pcm_new_stream);
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696int snd_pcm_new(struct snd_card *card, const char *id, int device,
697 int playback_count, int capture_count,
698 struct snd_pcm ** rpcm)
699{
700 struct snd_pcm *pcm;
701 int err;
702 static struct snd_device_ops ops = {
703 .dev_free = snd_pcm_dev_free,
704 .dev_register = snd_pcm_dev_register,
705 .dev_disconnect = snd_pcm_dev_disconnect,
706 };
707
708 if (snd_BUG_ON(!card))
709 return -ENXIO;
710 if (rpcm)
711 *rpcm = NULL;
712 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
713 if (pcm == NULL) {
714 snd_printk(KERN_ERR "Cannot allocate PCM\n");
715 return -ENOMEM;
716 }
717 pcm->card = card;
718 pcm->device = device;
719 if (id)
720 strlcpy(pcm->id, id, sizeof(pcm->id));
721 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
722 snd_pcm_free(pcm);
723 return err;
724 }
725 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
726 snd_pcm_free(pcm);
727 return err;
728 }
729 mutex_init(&pcm->open_mutex);
730 init_waitqueue_head(&pcm->open_wait);
731 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
732 snd_pcm_free(pcm);
733 return err;
734 }
735 if (rpcm)
736 *rpcm = pcm;
737 return 0;
738}
739
740EXPORT_SYMBOL(snd_pcm_new);
741
742static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
743{
744 struct snd_pcm_substream *substream, *substream_next;
745#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
746 struct snd_pcm_oss_setup *setup, *setupn;
747#endif
748 substream = pstr->substream;
749 while (substream) {
750 substream_next = substream->next;
751 snd_pcm_timer_done(substream);
752 snd_pcm_substream_proc_done(substream);
753 kfree(substream);
754 substream = substream_next;
755 }
756 snd_pcm_stream_proc_done(pstr);
757#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
758 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
759 setupn = setup->next;
760 kfree(setup->task_name);
761 kfree(setup);
762 }
763#endif
764}
765
766static int snd_pcm_free(struct snd_pcm *pcm)
767{
768 struct snd_pcm_notify *notify;
769
770 if (!pcm)
771 return 0;
772 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
773 notify->n_unregister(pcm);
774 }
775 if (pcm->private_free)
776 pcm->private_free(pcm);
777 snd_pcm_lib_preallocate_free_for_all(pcm);
778 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
779 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
780 kfree(pcm);
781 return 0;
782}
783
784static int snd_pcm_dev_free(struct snd_device *device)
785{
786 struct snd_pcm *pcm = device->device_data;
787 return snd_pcm_free(pcm);
788}
789
790int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
791 struct file *file,
792 struct snd_pcm_substream **rsubstream)
793{
794 struct snd_pcm_str * pstr;
795 struct snd_pcm_substream *substream;
796 struct snd_pcm_runtime *runtime;
797 struct snd_ctl_file *kctl;
798 struct snd_card *card;
799 int prefer_subdevice = -1;
800 size_t size;
801
802 if (snd_BUG_ON(!pcm || !rsubstream))
803 return -ENXIO;
804 *rsubstream = NULL;
805 pstr = &pcm->streams[stream];
806 if (pstr->substream == NULL || pstr->substream_count == 0)
807 return -ENODEV;
808
809 card = pcm->card;
810 read_lock(&card->ctl_files_rwlock);
811 list_for_each_entry(kctl, &card->ctl_files, list) {
812 if (kctl->pid == current->pid) {
813 prefer_subdevice = kctl->prefer_pcm_subdevice;
814 if (prefer_subdevice != -1)
815 break;
816 }
817 }
818 read_unlock(&card->ctl_files_rwlock);
819
820 switch (stream) {
821 case SNDRV_PCM_STREAM_PLAYBACK:
822 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
823 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
824 if (SUBSTREAM_BUSY(substream))
825 return -EAGAIN;
826 }
827 }
828 break;
829 case SNDRV_PCM_STREAM_CAPTURE:
830 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
831 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
832 if (SUBSTREAM_BUSY(substream))
833 return -EAGAIN;
834 }
835 }
836 break;
837 default:
838 return -EINVAL;
839 }
840
841 if (file->f_flags & O_APPEND) {
842 if (prefer_subdevice < 0) {
843 if (pstr->substream_count > 1)
844 return -EINVAL;
845 substream = pstr->substream;
846 } else {
847 for (substream = pstr->substream; substream;
848 substream = substream->next)
849 if (substream->number == prefer_subdevice)
850 break;
851 }
852 if (! substream)
853 return -ENODEV;
854 if (! SUBSTREAM_BUSY(substream))
855 return -EBADFD;
856 substream->ref_count++;
857 *rsubstream = substream;
858 return 0;
859 }
860
861 if (prefer_subdevice >= 0) {
862 for (substream = pstr->substream; substream; substream = substream->next)
863 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
864 goto __ok;
865 }
866 for (substream = pstr->substream; substream; substream = substream->next)
867 if (!SUBSTREAM_BUSY(substream))
868 break;
869 __ok:
870 if (substream == NULL)
871 return -EAGAIN;
872
873 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
874 if (runtime == NULL)
875 return -ENOMEM;
876
877 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
878 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
879 if (runtime->status == NULL) {
880 kfree(runtime);
881 return -ENOMEM;
882 }
883 memset((void*)runtime->status, 0, size);
884
885 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
886 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
887 if (runtime->control == NULL) {
888 snd_free_pages((void*)runtime->status,
889 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
890 kfree(runtime);
891 return -ENOMEM;
892 }
893 memset((void*)runtime->control, 0, size);
894
895 init_waitqueue_head(&runtime->sleep);
896
897 runtime->status->state = SNDRV_PCM_STATE_OPEN;
898
899 substream->runtime = runtime;
900 substream->private_data = pcm->private_data;
901 substream->ref_count = 1;
902 substream->f_flags = file->f_flags;
903 pstr->substream_opened++;
904 *rsubstream = substream;
905 return 0;
906}
907
908void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
909{
910 struct snd_pcm_runtime *runtime;
911
912 if (PCM_RUNTIME_CHECK(substream))
913 return;
914 runtime = substream->runtime;
915 if (runtime->private_free != NULL)
916 runtime->private_free(runtime);
917 snd_free_pages((void*)runtime->status,
918 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
919 snd_free_pages((void*)runtime->control,
920 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
921 kfree(runtime->hw_constraints.rules);
922 kfree(runtime);
923 substream->runtime = NULL;
924 substream->pstr->substream_opened--;
925}
926
927static ssize_t show_pcm_class(struct device *dev,
928 struct device_attribute *attr, char *buf)
929{
930 struct snd_pcm *pcm;
931 const char *str;
932 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
933 [SNDRV_PCM_CLASS_GENERIC] = "generic",
934 [SNDRV_PCM_CLASS_MULTI] = "multi",
935 [SNDRV_PCM_CLASS_MODEM] = "modem",
936 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
937 };
938
939 if (! (pcm = dev_get_drvdata(dev)) ||
940 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
941 str = "none";
942 else
943 str = strs[pcm->dev_class];
944 return snprintf(buf, PAGE_SIZE, "%s\n", str);
945}
946
947static struct device_attribute pcm_attrs =
948 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
949
950static int snd_pcm_dev_register(struct snd_device *device)
951{
952 int cidx, err;
953 struct snd_pcm_substream *substream;
954 struct snd_pcm_notify *notify;
955 char str[16];
956 struct snd_pcm *pcm;
957 struct device *dev;
958
959 if (snd_BUG_ON(!device || !device->device_data))
960 return -ENXIO;
961 pcm = device->device_data;
962 mutex_lock(®ister_mutex);
963 err = snd_pcm_add(pcm);
964 if (err) {
965 mutex_unlock(®ister_mutex);
966 return err;
967 }
968 for (cidx = 0; cidx < 2; cidx++) {
969 int devtype = -1;
970 if (pcm->streams[cidx].substream == NULL)
971 continue;
972 switch (cidx) {
973 case SNDRV_PCM_STREAM_PLAYBACK:
974 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
975 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
976 break;
977 case SNDRV_PCM_STREAM_CAPTURE:
978 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
979 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
980 break;
981 }
982
983
984
985 dev = pcm->dev;
986 if (!dev)
987 dev = snd_card_get_device_link(pcm->card);
988
989 err = snd_register_device_for_dev(devtype, pcm->card,
990 pcm->device,
991 &snd_pcm_f_ops[cidx],
992 pcm, str, dev);
993 if (err < 0) {
994 list_del(&pcm->list);
995 mutex_unlock(®ister_mutex);
996 return err;
997 }
998 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
999 &pcm_attrs);
1000 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1001 snd_pcm_timer_init(substream);
1002 }
1003
1004 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1005 notify->n_register(pcm);
1006
1007 mutex_unlock(®ister_mutex);
1008 return 0;
1009}
1010
1011static int snd_pcm_dev_disconnect(struct snd_device *device)
1012{
1013 struct snd_pcm *pcm = device->device_data;
1014 struct snd_pcm_notify *notify;
1015 struct snd_pcm_substream *substream;
1016 int cidx, devtype;
1017
1018 mutex_lock(®ister_mutex);
1019 if (list_empty(&pcm->list))
1020 goto unlock;
1021
1022 list_del_init(&pcm->list);
1023 for (cidx = 0; cidx < 2; cidx++)
1024 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1025 if (substream->runtime)
1026 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1027 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1028 notify->n_disconnect(pcm);
1029 }
1030 for (cidx = 0; cidx < 2; cidx++) {
1031 devtype = -1;
1032 switch (cidx) {
1033 case SNDRV_PCM_STREAM_PLAYBACK:
1034 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1035 break;
1036 case SNDRV_PCM_STREAM_CAPTURE:
1037 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1038 break;
1039 }
1040 snd_unregister_device(devtype, pcm->card, pcm->device);
1041 }
1042 unlock:
1043 mutex_unlock(®ister_mutex);
1044 return 0;
1045}
1046
1047int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1048{
1049 struct snd_pcm *pcm;
1050
1051 if (snd_BUG_ON(!notify ||
1052 !notify->n_register ||
1053 !notify->n_unregister ||
1054 !notify->n_disconnect))
1055 return -EINVAL;
1056 mutex_lock(®ister_mutex);
1057 if (nfree) {
1058 list_del(¬ify->list);
1059 list_for_each_entry(pcm, &snd_pcm_devices, list)
1060 notify->n_unregister(pcm);
1061 } else {
1062 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1063 list_for_each_entry(pcm, &snd_pcm_devices, list)
1064 notify->n_register(pcm);
1065 }
1066 mutex_unlock(®ister_mutex);
1067 return 0;
1068}
1069
1070EXPORT_SYMBOL(snd_pcm_notify);
1071
1072#ifdef CONFIG_PROC_FS
1073
1074
1075
1076
1077static void snd_pcm_proc_read(struct snd_info_entry *entry,
1078 struct snd_info_buffer *buffer)
1079{
1080 struct snd_pcm *pcm;
1081
1082 mutex_lock(®ister_mutex);
1083 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1084 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1085 pcm->card->number, pcm->device, pcm->id, pcm->name);
1086 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1087 snd_iprintf(buffer, " : playback %i",
1088 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1089 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1090 snd_iprintf(buffer, " : capture %i",
1091 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1092 snd_iprintf(buffer, "\n");
1093 }
1094 mutex_unlock(®ister_mutex);
1095}
1096
1097static struct snd_info_entry *snd_pcm_proc_entry;
1098
1099static void snd_pcm_proc_init(void)
1100{
1101 struct snd_info_entry *entry;
1102
1103 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1104 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1105 if (snd_info_register(entry) < 0) {
1106 snd_info_free_entry(entry);
1107 entry = NULL;
1108 }
1109 }
1110 snd_pcm_proc_entry = entry;
1111}
1112
1113static void snd_pcm_proc_done(void)
1114{
1115 snd_info_free_entry(snd_pcm_proc_entry);
1116}
1117
1118#else
1119#define snd_pcm_proc_init()
1120#define snd_pcm_proc_done()
1121#endif
1122
1123
1124
1125
1126
1127
1128static int __init alsa_pcm_init(void)
1129{
1130 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1131 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1132 snd_pcm_proc_init();
1133 return 0;
1134}
1135
1136static void __exit alsa_pcm_exit(void)
1137{
1138 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1139 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1140 snd_pcm_proc_done();
1141}
1142
1143module_init(alsa_pcm_init)
1144module_exit(alsa_pcm_exit)
1145
