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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 if (newpcm->internal)
76 return 0;
77
78 list_for_each_entry(pcm, &snd_pcm_devices, list) {
79 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
80 return -EBUSY;
81 if (pcm->card->number > newpcm->card->number ||
82 (pcm->card == newpcm->card &&
83 pcm->device > newpcm->device)) {
84 list_add(&newpcm->list, pcm->list.prev);
85 return 0;
86 }
87 }
88 list_add_tail(&newpcm->list, &snd_pcm_devices);
89 return 0;
90}
91
92static int snd_pcm_control_ioctl(struct snd_card *card,
93 struct snd_ctl_file *control,
94 unsigned int cmd, unsigned long arg)
95{
96 switch (cmd) {
97 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
98 {
99 int device;
100
101 if (get_user(device, (int __user *)arg))
102 return -EFAULT;
103 mutex_lock(®ister_mutex);
104 device = snd_pcm_next(card, device);
105 mutex_unlock(®ister_mutex);
106 if (put_user(device, (int __user *)arg))
107 return -EFAULT;
108 return 0;
109 }
110 case SNDRV_CTL_IOCTL_PCM_INFO:
111 {
112 struct snd_pcm_info __user *info;
113 unsigned int device, subdevice;
114 int stream;
115 struct snd_pcm *pcm;
116 struct snd_pcm_str *pstr;
117 struct snd_pcm_substream *substream;
118 int err;
119
120 info = (struct snd_pcm_info __user *)arg;
121 if (get_user(device, &info->device))
122 return -EFAULT;
123 if (get_user(stream, &info->stream))
124 return -EFAULT;
125 if (stream < 0 || stream > 1)
126 return -EINVAL;
127 if (get_user(subdevice, &info->subdevice))
128 return -EFAULT;
129 mutex_lock(®ister_mutex);
130 pcm = snd_pcm_get(card, device);
131 if (pcm == NULL) {
132 err = -ENXIO;
133 goto _error;
134 }
135 pstr = &pcm->streams[stream];
136 if (pstr->substream_count == 0) {
137 err = -ENOENT;
138 goto _error;
139 }
140 if (subdevice >= pstr->substream_count) {
141 err = -ENXIO;
142 goto _error;
143 }
144 for (substream = pstr->substream; substream;
145 substream = substream->next)
146 if (substream->number == (int)subdevice)
147 break;
148 if (substream == NULL) {
149 err = -ENXIO;
150 goto _error;
151 }
152 err = snd_pcm_info_user(substream, info);
153 _error:
154 mutex_unlock(®ister_mutex);
155 return err;
156 }
157 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
158 {
159 int val;
160
161 if (get_user(val, (int __user *)arg))
162 return -EFAULT;
163 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
164 return 0;
165 }
166 }
167 return -ENOIOCTLCMD;
168}
169
170#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
171
172static char *snd_pcm_format_names[] = {
173 FORMAT(S8),
174 FORMAT(U8),
175 FORMAT(S16_LE),
176 FORMAT(S16_BE),
177 FORMAT(U16_LE),
178 FORMAT(U16_BE),
179 FORMAT(S24_LE),
180 FORMAT(S24_BE),
181 FORMAT(U24_LE),
182 FORMAT(U24_BE),
183 FORMAT(S32_LE),
184 FORMAT(S32_BE),
185 FORMAT(U32_LE),
186 FORMAT(U32_BE),
187 FORMAT(FLOAT_LE),
188 FORMAT(FLOAT_BE),
189 FORMAT(FLOAT64_LE),
190 FORMAT(FLOAT64_BE),
191 FORMAT(IEC958_SUBFRAME_LE),
192 FORMAT(IEC958_SUBFRAME_BE),
193 FORMAT(MU_LAW),
194 FORMAT(A_LAW),
195 FORMAT(IMA_ADPCM),
196 FORMAT(MPEG),
197 FORMAT(GSM),
198 FORMAT(SPECIAL),
199 FORMAT(S24_3LE),
200 FORMAT(S24_3BE),
201 FORMAT(U24_3LE),
202 FORMAT(U24_3BE),
203 FORMAT(S20_3LE),
204 FORMAT(S20_3BE),
205 FORMAT(U20_3LE),
206 FORMAT(U20_3BE),
207 FORMAT(S18_3LE),
208 FORMAT(S18_3BE),
209 FORMAT(U18_3LE),
210 FORMAT(U18_3BE),
211 FORMAT(G723_24),
212 FORMAT(G723_24_1B),
213 FORMAT(G723_40),
214 FORMAT(G723_40_1B),
215 FORMAT(DSD_U8),
216 FORMAT(DSD_U16_LE),
217 FORMAT(DSD_U32_LE),
218 FORMAT(DSD_U16_BE),
219 FORMAT(DSD_U32_BE),
220};
221
222
223
224
225
226const char *snd_pcm_format_name(snd_pcm_format_t format)
227{
228 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
229 return "Unknown";
230 return snd_pcm_format_names[(__force unsigned int)format];
231}
232EXPORT_SYMBOL_GPL(snd_pcm_format_name);
233
234#ifdef CONFIG_SND_VERBOSE_PROCFS
235
236#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
237#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
238#define READY(v) [SNDRV_PCM_READY_##v] = #v
239#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
240#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
241#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
242#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
243#define START(v) [SNDRV_PCM_START_##v] = #v
244#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
245
246static char *snd_pcm_stream_names[] = {
247 STREAM(PLAYBACK),
248 STREAM(CAPTURE),
249};
250
251static char *snd_pcm_state_names[] = {
252 STATE(OPEN),
253 STATE(SETUP),
254 STATE(PREPARED),
255 STATE(RUNNING),
256 STATE(XRUN),
257 STATE(DRAINING),
258 STATE(PAUSED),
259 STATE(SUSPENDED),
260};
261
262static char *snd_pcm_access_names[] = {
263 ACCESS(MMAP_INTERLEAVED),
264 ACCESS(MMAP_NONINTERLEAVED),
265 ACCESS(MMAP_COMPLEX),
266 ACCESS(RW_INTERLEAVED),
267 ACCESS(RW_NONINTERLEAVED),
268};
269
270static char *snd_pcm_subformat_names[] = {
271 SUBFORMAT(STD),
272};
273
274static char *snd_pcm_tstamp_mode_names[] = {
275 TSTAMP(NONE),
276 TSTAMP(ENABLE),
277};
278
279static const char *snd_pcm_stream_name(int stream)
280{
281 return snd_pcm_stream_names[stream];
282}
283
284static const char *snd_pcm_access_name(snd_pcm_access_t access)
285{
286 return snd_pcm_access_names[(__force int)access];
287}
288
289static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
290{
291 return snd_pcm_subformat_names[(__force int)subformat];
292}
293
294static const char *snd_pcm_tstamp_mode_name(int mode)
295{
296 return snd_pcm_tstamp_mode_names[mode];
297}
298
299static const char *snd_pcm_state_name(snd_pcm_state_t state)
300{
301 return snd_pcm_state_names[(__force int)state];
302}
303
304#if IS_ENABLED(CONFIG_SND_PCM_OSS)
305#include <linux/soundcard.h>
306
307static const char *snd_pcm_oss_format_name(int format)
308{
309 switch (format) {
310 case AFMT_MU_LAW:
311 return "MU_LAW";
312 case AFMT_A_LAW:
313 return "A_LAW";
314 case AFMT_IMA_ADPCM:
315 return "IMA_ADPCM";
316 case AFMT_U8:
317 return "U8";
318 case AFMT_S16_LE:
319 return "S16_LE";
320 case AFMT_S16_BE:
321 return "S16_BE";
322 case AFMT_S8:
323 return "S8";
324 case AFMT_U16_LE:
325 return "U16_LE";
326 case AFMT_U16_BE:
327 return "U16_BE";
328 case AFMT_MPEG:
329 return "MPEG";
330 default:
331 return "unknown";
332 }
333}
334#endif
335
336static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
337 struct snd_info_buffer *buffer)
338{
339 struct snd_pcm_info *info;
340 int err;
341
342 if (! substream)
343 return;
344
345 info = kmalloc(sizeof(*info), GFP_KERNEL);
346 if (!info)
347 return;
348
349 err = snd_pcm_info(substream, info);
350 if (err < 0) {
351 snd_iprintf(buffer, "error %d\n", err);
352 kfree(info);
353 return;
354 }
355 snd_iprintf(buffer, "card: %d\n", info->card);
356 snd_iprintf(buffer, "device: %d\n", info->device);
357 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
358 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
359 snd_iprintf(buffer, "id: %s\n", info->id);
360 snd_iprintf(buffer, "name: %s\n", info->name);
361 snd_iprintf(buffer, "subname: %s\n", info->subname);
362 snd_iprintf(buffer, "class: %d\n", info->dev_class);
363 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
364 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
365 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
366 kfree(info);
367}
368
369static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
370 struct snd_info_buffer *buffer)
371{
372 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
373 buffer);
374}
375
376static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
378{
379 snd_pcm_proc_info_read(entry->private_data, buffer);
380}
381
382static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
383 struct snd_info_buffer *buffer)
384{
385 struct snd_pcm_substream *substream = entry->private_data;
386 struct snd_pcm_runtime *runtime;
387
388 mutex_lock(&substream->pcm->open_mutex);
389 runtime = substream->runtime;
390 if (!runtime) {
391 snd_iprintf(buffer, "closed\n");
392 goto unlock;
393 }
394 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
395 snd_iprintf(buffer, "no setup\n");
396 goto unlock;
397 }
398 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
399 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
400 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
401 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
402 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
403 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
404 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
405#if IS_ENABLED(CONFIG_SND_PCM_OSS)
406 if (substream->oss.oss) {
407 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
408 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
409 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
410 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
411 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
412 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
413 }
414#endif
415 unlock:
416 mutex_unlock(&substream->pcm->open_mutex);
417}
418
419static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
420 struct snd_info_buffer *buffer)
421{
422 struct snd_pcm_substream *substream = entry->private_data;
423 struct snd_pcm_runtime *runtime;
424
425 mutex_lock(&substream->pcm->open_mutex);
426 runtime = substream->runtime;
427 if (!runtime) {
428 snd_iprintf(buffer, "closed\n");
429 goto unlock;
430 }
431 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
432 snd_iprintf(buffer, "no setup\n");
433 goto unlock;
434 }
435 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
436 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
437 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
438 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
439 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
440 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
441 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
442 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
443 unlock:
444 mutex_unlock(&substream->pcm->open_mutex);
445}
446
447static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
448 struct snd_info_buffer *buffer)
449{
450 struct snd_pcm_substream *substream = entry->private_data;
451 struct snd_pcm_runtime *runtime;
452 struct snd_pcm_status status;
453 int err;
454
455 mutex_lock(&substream->pcm->open_mutex);
456 runtime = substream->runtime;
457 if (!runtime) {
458 snd_iprintf(buffer, "closed\n");
459 goto unlock;
460 }
461 memset(&status, 0, sizeof(status));
462 err = snd_pcm_status(substream, &status);
463 if (err < 0) {
464 snd_iprintf(buffer, "error %d\n", err);
465 goto unlock;
466 }
467 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
468 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
469 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
470 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
471 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
472 status.tstamp.tv_sec, status.tstamp.tv_nsec);
473 snd_iprintf(buffer, "delay : %ld\n", status.delay);
474 snd_iprintf(buffer, "avail : %ld\n", status.avail);
475 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
476 snd_iprintf(buffer, "-----\n");
477 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
478 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
479 unlock:
480 mutex_unlock(&substream->pcm->open_mutex);
481}
482
483#ifdef CONFIG_SND_PCM_XRUN_DEBUG
484static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
485 struct snd_info_buffer *buffer)
486{
487 struct snd_pcm_substream *substream = entry->private_data;
488 struct snd_pcm_runtime *runtime;
489
490 snd_pcm_stream_lock_irq(substream);
491 runtime = substream->runtime;
492 if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
493 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
494 snd_pcm_stream_unlock_irq(substream);
495}
496
497static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
498 struct snd_info_buffer *buffer)
499{
500 struct snd_pcm_str *pstr = entry->private_data;
501 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
502}
503
504static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
505 struct snd_info_buffer *buffer)
506{
507 struct snd_pcm_str *pstr = entry->private_data;
508 char line[64];
509 if (!snd_info_get_line(buffer, line, sizeof(line)))
510 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
511}
512#endif
513
514static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
515{
516 struct snd_pcm *pcm = pstr->pcm;
517 struct snd_info_entry *entry;
518 char name[16];
519
520 sprintf(name, "pcm%i%c", pcm->device,
521 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
522 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
523 return -ENOMEM;
524 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
525 if (snd_info_register(entry) < 0) {
526 snd_info_free_entry(entry);
527 return -ENOMEM;
528 }
529 pstr->proc_root = entry;
530
531 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
532 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
533 if (snd_info_register(entry) < 0) {
534 snd_info_free_entry(entry);
535 entry = NULL;
536 }
537 }
538 pstr->proc_info_entry = entry;
539
540#ifdef CONFIG_SND_PCM_XRUN_DEBUG
541 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
542 pstr->proc_root)) != NULL) {
543 entry->c.text.read = snd_pcm_xrun_debug_read;
544 entry->c.text.write = snd_pcm_xrun_debug_write;
545 entry->mode |= S_IWUSR;
546 entry->private_data = pstr;
547 if (snd_info_register(entry) < 0) {
548 snd_info_free_entry(entry);
549 entry = NULL;
550 }
551 }
552 pstr->proc_xrun_debug_entry = entry;
553#endif
554 return 0;
555}
556
557static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
558{
559#ifdef CONFIG_SND_PCM_XRUN_DEBUG
560 snd_info_free_entry(pstr->proc_xrun_debug_entry);
561 pstr->proc_xrun_debug_entry = NULL;
562#endif
563 snd_info_free_entry(pstr->proc_info_entry);
564 pstr->proc_info_entry = NULL;
565 snd_info_free_entry(pstr->proc_root);
566 pstr->proc_root = NULL;
567 return 0;
568}
569
570static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
571{
572 struct snd_info_entry *entry;
573 struct snd_card *card;
574 char name[16];
575
576 card = substream->pcm->card;
577
578 sprintf(name, "sub%i", substream->number);
579 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
580 return -ENOMEM;
581 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
582 if (snd_info_register(entry) < 0) {
583 snd_info_free_entry(entry);
584 return -ENOMEM;
585 }
586 substream->proc_root = entry;
587
588 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
589 snd_info_set_text_ops(entry, substream,
590 snd_pcm_substream_proc_info_read);
591 if (snd_info_register(entry) < 0) {
592 snd_info_free_entry(entry);
593 entry = NULL;
594 }
595 }
596 substream->proc_info_entry = entry;
597
598 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
599 snd_info_set_text_ops(entry, substream,
600 snd_pcm_substream_proc_hw_params_read);
601 if (snd_info_register(entry) < 0) {
602 snd_info_free_entry(entry);
603 entry = NULL;
604 }
605 }
606 substream->proc_hw_params_entry = entry;
607
608 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
609 snd_info_set_text_ops(entry, substream,
610 snd_pcm_substream_proc_sw_params_read);
611 if (snd_info_register(entry) < 0) {
612 snd_info_free_entry(entry);
613 entry = NULL;
614 }
615 }
616 substream->proc_sw_params_entry = entry;
617
618 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
619 snd_info_set_text_ops(entry, substream,
620 snd_pcm_substream_proc_status_read);
621 if (snd_info_register(entry) < 0) {
622 snd_info_free_entry(entry);
623 entry = NULL;
624 }
625 }
626 substream->proc_status_entry = entry;
627
628#ifdef CONFIG_SND_PCM_XRUN_DEBUG
629 entry = snd_info_create_card_entry(card, "xrun_injection",
630 substream->proc_root);
631 if (entry) {
632 entry->private_data = substream;
633 entry->c.text.read = NULL;
634 entry->c.text.write = snd_pcm_xrun_injection_write;
635 entry->mode = S_IFREG | S_IWUSR;
636 if (snd_info_register(entry) < 0) {
637 snd_info_free_entry(entry);
638 entry = NULL;
639 }
640 }
641 substream->proc_xrun_injection_entry = entry;
642#endif
643
644 return 0;
645}
646
647static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
648{
649 snd_info_free_entry(substream->proc_info_entry);
650 substream->proc_info_entry = NULL;
651 snd_info_free_entry(substream->proc_hw_params_entry);
652 substream->proc_hw_params_entry = NULL;
653 snd_info_free_entry(substream->proc_sw_params_entry);
654 substream->proc_sw_params_entry = NULL;
655 snd_info_free_entry(substream->proc_status_entry);
656 substream->proc_status_entry = NULL;
657#ifdef CONFIG_SND_PCM_XRUN_DEBUG
658 snd_info_free_entry(substream->proc_xrun_injection_entry);
659 substream->proc_xrun_injection_entry = NULL;
660#endif
661 snd_info_free_entry(substream->proc_root);
662 substream->proc_root = NULL;
663 return 0;
664}
665#else
666static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
667static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
668static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
669static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
670#endif
671
672static const struct attribute_group *pcm_dev_attr_groups[];
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
688{
689 int idx, err;
690 struct snd_pcm_str *pstr = &pcm->streams[stream];
691 struct snd_pcm_substream *substream, *prev;
692
693#if IS_ENABLED(CONFIG_SND_PCM_OSS)
694 mutex_init(&pstr->oss.setup_mutex);
695#endif
696 pstr->stream = stream;
697 pstr->pcm = pcm;
698 pstr->substream_count = substream_count;
699 if (!substream_count)
700 return 0;
701
702 snd_device_initialize(&pstr->dev, pcm->card);
703 pstr->dev.groups = pcm_dev_attr_groups;
704 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
705 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
706
707 if (!pcm->internal) {
708 err = snd_pcm_stream_proc_init(pstr);
709 if (err < 0) {
710 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
711 return err;
712 }
713 }
714 prev = NULL;
715 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
716 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
717 if (!substream)
718 return -ENOMEM;
719 substream->pcm = pcm;
720 substream->pstr = pstr;
721 substream->number = idx;
722 substream->stream = stream;
723 sprintf(substream->name, "subdevice #%i", idx);
724 substream->buffer_bytes_max = UINT_MAX;
725 if (prev == NULL)
726 pstr->substream = substream;
727 else
728 prev->next = substream;
729
730 if (!pcm->internal) {
731 err = snd_pcm_substream_proc_init(substream);
732 if (err < 0) {
733 pcm_err(pcm,
734 "Error in snd_pcm_stream_proc_init\n");
735 if (prev == NULL)
736 pstr->substream = NULL;
737 else
738 prev->next = NULL;
739 kfree(substream);
740 return err;
741 }
742 }
743 substream->group = &substream->self_group;
744 spin_lock_init(&substream->self_group.lock);
745 mutex_init(&substream->self_group.mutex);
746 INIT_LIST_HEAD(&substream->self_group.substreams);
747 list_add_tail(&substream->link_list, &substream->self_group.substreams);
748 atomic_set(&substream->mmap_count, 0);
749 prev = substream;
750 }
751 return 0;
752}
753EXPORT_SYMBOL(snd_pcm_new_stream);
754
755static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
756 int playback_count, int capture_count, bool internal,
757 struct snd_pcm **rpcm)
758{
759 struct snd_pcm *pcm;
760 int err;
761 static struct snd_device_ops ops = {
762 .dev_free = snd_pcm_dev_free,
763 .dev_register = snd_pcm_dev_register,
764 .dev_disconnect = snd_pcm_dev_disconnect,
765 };
766
767 if (snd_BUG_ON(!card))
768 return -ENXIO;
769 if (rpcm)
770 *rpcm = NULL;
771 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
772 if (!pcm)
773 return -ENOMEM;
774 pcm->card = card;
775 pcm->device = device;
776 pcm->internal = internal;
777 mutex_init(&pcm->open_mutex);
778 init_waitqueue_head(&pcm->open_wait);
779 INIT_LIST_HEAD(&pcm->list);
780 if (id)
781 strlcpy(pcm->id, id, sizeof(pcm->id));
782 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
783 snd_pcm_free(pcm);
784 return err;
785 }
786 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
787 snd_pcm_free(pcm);
788 return err;
789 }
790 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
791 snd_pcm_free(pcm);
792 return err;
793 }
794 if (rpcm)
795 *rpcm = pcm;
796 return 0;
797}
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815int snd_pcm_new(struct snd_card *card, const char *id, int device,
816 int playback_count, int capture_count, struct snd_pcm **rpcm)
817{
818 return _snd_pcm_new(card, id, device, playback_count, capture_count,
819 false, rpcm);
820}
821EXPORT_SYMBOL(snd_pcm_new);
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
844 int playback_count, int capture_count,
845 struct snd_pcm **rpcm)
846{
847 return _snd_pcm_new(card, id, device, playback_count, capture_count,
848 true, rpcm);
849}
850EXPORT_SYMBOL(snd_pcm_new_internal);
851
852static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
853{
854 struct snd_pcm_substream *substream, *substream_next;
855#if IS_ENABLED(CONFIG_SND_PCM_OSS)
856 struct snd_pcm_oss_setup *setup, *setupn;
857#endif
858 substream = pstr->substream;
859 while (substream) {
860 substream_next = substream->next;
861 snd_pcm_timer_done(substream);
862 snd_pcm_substream_proc_done(substream);
863 kfree(substream);
864 substream = substream_next;
865 }
866 snd_pcm_stream_proc_done(pstr);
867#if IS_ENABLED(CONFIG_SND_PCM_OSS)
868 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
869 setupn = setup->next;
870 kfree(setup->task_name);
871 kfree(setup);
872 }
873#endif
874 if (pstr->substream_count)
875 put_device(&pstr->dev);
876}
877
878static int snd_pcm_free(struct snd_pcm *pcm)
879{
880 struct snd_pcm_notify *notify;
881
882 if (!pcm)
883 return 0;
884 if (!pcm->internal) {
885 list_for_each_entry(notify, &snd_pcm_notify_list, list)
886 notify->n_unregister(pcm);
887 }
888 if (pcm->private_free)
889 pcm->private_free(pcm);
890 snd_pcm_lib_preallocate_free_for_all(pcm);
891 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
892 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
893 kfree(pcm);
894 return 0;
895}
896
897static int snd_pcm_dev_free(struct snd_device *device)
898{
899 struct snd_pcm *pcm = device->device_data;
900 return snd_pcm_free(pcm);
901}
902
903int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
904 struct file *file,
905 struct snd_pcm_substream **rsubstream)
906{
907 struct snd_pcm_str * pstr;
908 struct snd_pcm_substream *substream;
909 struct snd_pcm_runtime *runtime;
910 struct snd_card *card;
911 int prefer_subdevice;
912 size_t size;
913
914 if (snd_BUG_ON(!pcm || !rsubstream))
915 return -ENXIO;
916 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
917 stream != SNDRV_PCM_STREAM_CAPTURE))
918 return -EINVAL;
919 *rsubstream = NULL;
920 pstr = &pcm->streams[stream];
921 if (pstr->substream == NULL || pstr->substream_count == 0)
922 return -ENODEV;
923
924 card = pcm->card;
925 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
926
927 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
928 int opposite = !stream;
929
930 for (substream = pcm->streams[opposite].substream; substream;
931 substream = substream->next) {
932 if (SUBSTREAM_BUSY(substream))
933 return -EAGAIN;
934 }
935 }
936
937 if (file->f_flags & O_APPEND) {
938 if (prefer_subdevice < 0) {
939 if (pstr->substream_count > 1)
940 return -EINVAL;
941 substream = pstr->substream;
942 } else {
943 for (substream = pstr->substream; substream;
944 substream = substream->next)
945 if (substream->number == prefer_subdevice)
946 break;
947 }
948 if (! substream)
949 return -ENODEV;
950 if (! SUBSTREAM_BUSY(substream))
951 return -EBADFD;
952 substream->ref_count++;
953 *rsubstream = substream;
954 return 0;
955 }
956
957 for (substream = pstr->substream; substream; substream = substream->next) {
958 if (!SUBSTREAM_BUSY(substream) &&
959 (prefer_subdevice == -1 ||
960 substream->number == prefer_subdevice))
961 break;
962 }
963 if (substream == NULL)
964 return -EAGAIN;
965
966 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
967 if (runtime == NULL)
968 return -ENOMEM;
969
970 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
971 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
972 if (runtime->status == NULL) {
973 kfree(runtime);
974 return -ENOMEM;
975 }
976 memset((void*)runtime->status, 0, size);
977
978 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
979 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
980 if (runtime->control == NULL) {
981 snd_free_pages((void*)runtime->status,
982 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
983 kfree(runtime);
984 return -ENOMEM;
985 }
986 memset((void*)runtime->control, 0, size);
987
988 init_waitqueue_head(&runtime->sleep);
989 init_waitqueue_head(&runtime->tsleep);
990
991 runtime->status->state = SNDRV_PCM_STATE_OPEN;
992
993 substream->runtime = runtime;
994 substream->private_data = pcm->private_data;
995 substream->ref_count = 1;
996 substream->f_flags = file->f_flags;
997 substream->pid = get_pid(task_pid(current));
998 pstr->substream_opened++;
999 *rsubstream = substream;
1000 return 0;
1001}
1002
1003void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1004{
1005 struct snd_pcm_runtime *runtime;
1006
1007 if (PCM_RUNTIME_CHECK(substream))
1008 return;
1009 runtime = substream->runtime;
1010 if (runtime->private_free != NULL)
1011 runtime->private_free(runtime);
1012 snd_free_pages((void*)runtime->status,
1013 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1014 snd_free_pages((void*)runtime->control,
1015 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1016 kfree(runtime->hw_constraints.rules);
1017 kfree(runtime);
1018 substream->runtime = NULL;
1019 put_pid(substream->pid);
1020 substream->pid = NULL;
1021 substream->pstr->substream_opened--;
1022}
1023
1024static ssize_t show_pcm_class(struct device *dev,
1025 struct device_attribute *attr, char *buf)
1026{
1027 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1028 struct snd_pcm *pcm = pstr->pcm;
1029 const char *str;
1030 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1031 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1032 [SNDRV_PCM_CLASS_MULTI] = "multi",
1033 [SNDRV_PCM_CLASS_MODEM] = "modem",
1034 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1035 };
1036
1037 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1038 str = "none";
1039 else
1040 str = strs[pcm->dev_class];
1041 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1042}
1043
1044static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1045static struct attribute *pcm_dev_attrs[] = {
1046 &dev_attr_pcm_class.attr,
1047 NULL
1048};
1049
1050static struct attribute_group pcm_dev_attr_group = {
1051 .attrs = pcm_dev_attrs,
1052};
1053
1054static const struct attribute_group *pcm_dev_attr_groups[] = {
1055 &pcm_dev_attr_group,
1056 NULL
1057};
1058
1059static int snd_pcm_dev_register(struct snd_device *device)
1060{
1061 int cidx, err;
1062 struct snd_pcm_substream *substream;
1063 struct snd_pcm_notify *notify;
1064 struct snd_pcm *pcm;
1065
1066 if (snd_BUG_ON(!device || !device->device_data))
1067 return -ENXIO;
1068 pcm = device->device_data;
1069 if (pcm->internal)
1070 return 0;
1071
1072 mutex_lock(®ister_mutex);
1073 err = snd_pcm_add(pcm);
1074 if (err)
1075 goto unlock;
1076 for (cidx = 0; cidx < 2; cidx++) {
1077 int devtype = -1;
1078 if (pcm->streams[cidx].substream == NULL)
1079 continue;
1080 switch (cidx) {
1081 case SNDRV_PCM_STREAM_PLAYBACK:
1082 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1083 break;
1084 case SNDRV_PCM_STREAM_CAPTURE:
1085 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1086 break;
1087 }
1088
1089 err = snd_register_device(devtype, pcm->card, pcm->device,
1090 &snd_pcm_f_ops[cidx], pcm,
1091 &pcm->streams[cidx].dev);
1092 if (err < 0) {
1093 list_del_init(&pcm->list);
1094 goto unlock;
1095 }
1096
1097 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1098 snd_pcm_timer_init(substream);
1099 }
1100
1101 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1102 notify->n_register(pcm);
1103
1104 unlock:
1105 mutex_unlock(®ister_mutex);
1106 return err;
1107}
1108
1109static int snd_pcm_dev_disconnect(struct snd_device *device)
1110{
1111 struct snd_pcm *pcm = device->device_data;
1112 struct snd_pcm_notify *notify;
1113 struct snd_pcm_substream *substream;
1114 int cidx;
1115
1116 mutex_lock(®ister_mutex);
1117 mutex_lock(&pcm->open_mutex);
1118 wake_up(&pcm->open_wait);
1119 list_del_init(&pcm->list);
1120 for (cidx = 0; cidx < 2; cidx++) {
1121 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1122 snd_pcm_stream_lock_irq(substream);
1123 if (substream->runtime) {
1124 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1125 wake_up(&substream->runtime->sleep);
1126 wake_up(&substream->runtime->tsleep);
1127 }
1128 snd_pcm_stream_unlock_irq(substream);
1129 }
1130 }
1131 if (!pcm->internal) {
1132 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1133 notify->n_disconnect(pcm);
1134 }
1135 for (cidx = 0; cidx < 2; cidx++) {
1136 if (!pcm->internal)
1137 snd_unregister_device(&pcm->streams[cidx].dev);
1138 if (pcm->streams[cidx].chmap_kctl) {
1139 snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1140 pcm->streams[cidx].chmap_kctl = NULL;
1141 }
1142 }
1143 mutex_unlock(&pcm->open_mutex);
1144 mutex_unlock(®ister_mutex);
1145 return 0;
1146}
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1158{
1159 struct snd_pcm *pcm;
1160
1161 if (snd_BUG_ON(!notify ||
1162 !notify->n_register ||
1163 !notify->n_unregister ||
1164 !notify->n_disconnect))
1165 return -EINVAL;
1166 mutex_lock(®ister_mutex);
1167 if (nfree) {
1168 list_del(¬ify->list);
1169 list_for_each_entry(pcm, &snd_pcm_devices, list)
1170 notify->n_unregister(pcm);
1171 } else {
1172 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1173 list_for_each_entry(pcm, &snd_pcm_devices, list)
1174 notify->n_register(pcm);
1175 }
1176 mutex_unlock(®ister_mutex);
1177 return 0;
1178}
1179EXPORT_SYMBOL(snd_pcm_notify);
1180
1181#ifdef CONFIG_SND_PROC_FS
1182
1183
1184
1185
1186static void snd_pcm_proc_read(struct snd_info_entry *entry,
1187 struct snd_info_buffer *buffer)
1188{
1189 struct snd_pcm *pcm;
1190
1191 mutex_lock(®ister_mutex);
1192 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1193 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1194 pcm->card->number, pcm->device, pcm->id, pcm->name);
1195 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1196 snd_iprintf(buffer, " : playback %i",
1197 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1198 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1199 snd_iprintf(buffer, " : capture %i",
1200 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1201 snd_iprintf(buffer, "\n");
1202 }
1203 mutex_unlock(®ister_mutex);
1204}
1205
1206static struct snd_info_entry *snd_pcm_proc_entry;
1207
1208static void snd_pcm_proc_init(void)
1209{
1210 struct snd_info_entry *entry;
1211
1212 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1213 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1214 if (snd_info_register(entry) < 0) {
1215 snd_info_free_entry(entry);
1216 entry = NULL;
1217 }
1218 }
1219 snd_pcm_proc_entry = entry;
1220}
1221
1222static void snd_pcm_proc_done(void)
1223{
1224 snd_info_free_entry(snd_pcm_proc_entry);
1225}
1226
1227#else
1228#define snd_pcm_proc_init()
1229#define snd_pcm_proc_done()
1230#endif
1231
1232
1233
1234
1235
1236
1237static int __init alsa_pcm_init(void)
1238{
1239 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1240 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1241 snd_pcm_proc_init();
1242 return 0;
1243}
1244
1245static void __exit alsa_pcm_exit(void)
1246{
1247 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1248 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1249 snd_pcm_proc_done();
1250}
1251
1252module_init(alsa_pcm_init)
1253module_exit(alsa_pcm_exit)
1254
