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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 <linux/nospec.h>
29#include <sound/core.h>
30#include <sound/minors.h>
31#include <sound/pcm.h>
32#include <sound/timer.h>
33#include <sound/control.h>
34#include <sound/info.h>
35
36#include "pcm_local.h"
37
38MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
39MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
40MODULE_LICENSE("GPL");
41
42static LIST_HEAD(snd_pcm_devices);
43static DEFINE_MUTEX(register_mutex);
44#if IS_ENABLED(CONFIG_SND_PCM_OSS)
45static LIST_HEAD(snd_pcm_notify_list);
46#endif
47
48static int snd_pcm_free(struct snd_pcm *pcm);
49static int snd_pcm_dev_free(struct snd_device *device);
50static int snd_pcm_dev_register(struct snd_device *device);
51static int snd_pcm_dev_disconnect(struct snd_device *device);
52
53static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
54{
55 struct snd_pcm *pcm;
56
57 list_for_each_entry(pcm, &snd_pcm_devices, list) {
58 if (pcm->card == card && pcm->device == device)
59 return pcm;
60 }
61 return NULL;
62}
63
64static int snd_pcm_next(struct snd_card *card, int device)
65{
66 struct snd_pcm *pcm;
67
68 list_for_each_entry(pcm, &snd_pcm_devices, list) {
69 if (pcm->card == card && pcm->device > device)
70 return pcm->device;
71 else if (pcm->card->number > card->number)
72 return -1;
73 }
74 return -1;
75}
76
77static int snd_pcm_add(struct snd_pcm *newpcm)
78{
79 struct snd_pcm *pcm;
80
81 if (newpcm->internal)
82 return 0;
83
84 list_for_each_entry(pcm, &snd_pcm_devices, list) {
85 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
86 return -EBUSY;
87 if (pcm->card->number > newpcm->card->number ||
88 (pcm->card == newpcm->card &&
89 pcm->device > newpcm->device)) {
90 list_add(&newpcm->list, pcm->list.prev);
91 return 0;
92 }
93 }
94 list_add_tail(&newpcm->list, &snd_pcm_devices);
95 return 0;
96}
97
98static int snd_pcm_control_ioctl(struct snd_card *card,
99 struct snd_ctl_file *control,
100 unsigned int cmd, unsigned long arg)
101{
102 switch (cmd) {
103 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
104 {
105 int device;
106
107 if (get_user(device, (int __user *)arg))
108 return -EFAULT;
109 mutex_lock(®ister_mutex);
110 device = snd_pcm_next(card, device);
111 mutex_unlock(®ister_mutex);
112 if (put_user(device, (int __user *)arg))
113 return -EFAULT;
114 return 0;
115 }
116 case SNDRV_CTL_IOCTL_PCM_INFO:
117 {
118 struct snd_pcm_info __user *info;
119 unsigned int device, subdevice;
120 int stream;
121 struct snd_pcm *pcm;
122 struct snd_pcm_str *pstr;
123 struct snd_pcm_substream *substream;
124 int err;
125
126 info = (struct snd_pcm_info __user *)arg;
127 if (get_user(device, &info->device))
128 return -EFAULT;
129 if (get_user(stream, &info->stream))
130 return -EFAULT;
131 if (stream < 0 || stream > 1)
132 return -EINVAL;
133 stream = array_index_nospec(stream, 2);
134 if (get_user(subdevice, &info->subdevice))
135 return -EFAULT;
136 mutex_lock(®ister_mutex);
137 pcm = snd_pcm_get(card, device);
138 if (pcm == NULL) {
139 err = -ENXIO;
140 goto _error;
141 }
142 pstr = &pcm->streams[stream];
143 if (pstr->substream_count == 0) {
144 err = -ENOENT;
145 goto _error;
146 }
147 if (subdevice >= pstr->substream_count) {
148 err = -ENXIO;
149 goto _error;
150 }
151 for (substream = pstr->substream; substream;
152 substream = substream->next)
153 if (substream->number == (int)subdevice)
154 break;
155 if (substream == NULL) {
156 err = -ENXIO;
157 goto _error;
158 }
159 mutex_lock(&pcm->open_mutex);
160 err = snd_pcm_info_user(substream, info);
161 mutex_unlock(&pcm->open_mutex);
162 _error:
163 mutex_unlock(®ister_mutex);
164 return err;
165 }
166 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
167 {
168 int val;
169
170 if (get_user(val, (int __user *)arg))
171 return -EFAULT;
172 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
173 return 0;
174 }
175 }
176 return -ENOIOCTLCMD;
177}
178
179#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
180
181static char *snd_pcm_format_names[] = {
182 FORMAT(S8),
183 FORMAT(U8),
184 FORMAT(S16_LE),
185 FORMAT(S16_BE),
186 FORMAT(U16_LE),
187 FORMAT(U16_BE),
188 FORMAT(S24_LE),
189 FORMAT(S24_BE),
190 FORMAT(U24_LE),
191 FORMAT(U24_BE),
192 FORMAT(S32_LE),
193 FORMAT(S32_BE),
194 FORMAT(U32_LE),
195 FORMAT(U32_BE),
196 FORMAT(FLOAT_LE),
197 FORMAT(FLOAT_BE),
198 FORMAT(FLOAT64_LE),
199 FORMAT(FLOAT64_BE),
200 FORMAT(IEC958_SUBFRAME_LE),
201 FORMAT(IEC958_SUBFRAME_BE),
202 FORMAT(MU_LAW),
203 FORMAT(A_LAW),
204 FORMAT(IMA_ADPCM),
205 FORMAT(MPEG),
206 FORMAT(GSM),
207 FORMAT(SPECIAL),
208 FORMAT(S24_3LE),
209 FORMAT(S24_3BE),
210 FORMAT(U24_3LE),
211 FORMAT(U24_3BE),
212 FORMAT(S20_3LE),
213 FORMAT(S20_3BE),
214 FORMAT(U20_3LE),
215 FORMAT(U20_3BE),
216 FORMAT(S18_3LE),
217 FORMAT(S18_3BE),
218 FORMAT(U18_3LE),
219 FORMAT(U18_3BE),
220 FORMAT(G723_24),
221 FORMAT(G723_24_1B),
222 FORMAT(G723_40),
223 FORMAT(G723_40_1B),
224 FORMAT(DSD_U8),
225 FORMAT(DSD_U16_LE),
226 FORMAT(DSD_U32_LE),
227 FORMAT(DSD_U16_BE),
228 FORMAT(DSD_U32_BE),
229};
230
231
232
233
234
235const char *snd_pcm_format_name(snd_pcm_format_t format)
236{
237 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
238 return "Unknown";
239 return snd_pcm_format_names[(__force unsigned int)format];
240}
241EXPORT_SYMBOL_GPL(snd_pcm_format_name);
242
243#ifdef CONFIG_SND_VERBOSE_PROCFS
244
245#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
246#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
247#define READY(v) [SNDRV_PCM_READY_##v] = #v
248#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
249#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
250#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
251#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
252#define START(v) [SNDRV_PCM_START_##v] = #v
253#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
254
255static char *snd_pcm_stream_names[] = {
256 STREAM(PLAYBACK),
257 STREAM(CAPTURE),
258};
259
260static char *snd_pcm_state_names[] = {
261 STATE(OPEN),
262 STATE(SETUP),
263 STATE(PREPARED),
264 STATE(RUNNING),
265 STATE(XRUN),
266 STATE(DRAINING),
267 STATE(PAUSED),
268 STATE(SUSPENDED),
269};
270
271static char *snd_pcm_access_names[] = {
272 ACCESS(MMAP_INTERLEAVED),
273 ACCESS(MMAP_NONINTERLEAVED),
274 ACCESS(MMAP_COMPLEX),
275 ACCESS(RW_INTERLEAVED),
276 ACCESS(RW_NONINTERLEAVED),
277};
278
279static char *snd_pcm_subformat_names[] = {
280 SUBFORMAT(STD),
281};
282
283static char *snd_pcm_tstamp_mode_names[] = {
284 TSTAMP(NONE),
285 TSTAMP(ENABLE),
286};
287
288static const char *snd_pcm_stream_name(int stream)
289{
290 return snd_pcm_stream_names[stream];
291}
292
293static const char *snd_pcm_access_name(snd_pcm_access_t access)
294{
295 return snd_pcm_access_names[(__force int)access];
296}
297
298static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
299{
300 return snd_pcm_subformat_names[(__force int)subformat];
301}
302
303static const char *snd_pcm_tstamp_mode_name(int mode)
304{
305 return snd_pcm_tstamp_mode_names[mode];
306}
307
308static const char *snd_pcm_state_name(snd_pcm_state_t state)
309{
310 return snd_pcm_state_names[(__force int)state];
311}
312
313#if IS_ENABLED(CONFIG_SND_PCM_OSS)
314#include <linux/soundcard.h>
315
316static const char *snd_pcm_oss_format_name(int format)
317{
318 switch (format) {
319 case AFMT_MU_LAW:
320 return "MU_LAW";
321 case AFMT_A_LAW:
322 return "A_LAW";
323 case AFMT_IMA_ADPCM:
324 return "IMA_ADPCM";
325 case AFMT_U8:
326 return "U8";
327 case AFMT_S16_LE:
328 return "S16_LE";
329 case AFMT_S16_BE:
330 return "S16_BE";
331 case AFMT_S8:
332 return "S8";
333 case AFMT_U16_LE:
334 return "U16_LE";
335 case AFMT_U16_BE:
336 return "U16_BE";
337 case AFMT_MPEG:
338 return "MPEG";
339 default:
340 return "unknown";
341 }
342}
343#endif
344
345static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
346 struct snd_info_buffer *buffer)
347{
348 struct snd_pcm_info *info;
349 int err;
350
351 if (! substream)
352 return;
353
354 info = kmalloc(sizeof(*info), GFP_KERNEL);
355 if (!info)
356 return;
357
358 err = snd_pcm_info(substream, info);
359 if (err < 0) {
360 snd_iprintf(buffer, "error %d\n", err);
361 kfree(info);
362 return;
363 }
364 snd_iprintf(buffer, "card: %d\n", info->card);
365 snd_iprintf(buffer, "device: %d\n", info->device);
366 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
367 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
368 snd_iprintf(buffer, "id: %s\n", info->id);
369 snd_iprintf(buffer, "name: %s\n", info->name);
370 snd_iprintf(buffer, "subname: %s\n", info->subname);
371 snd_iprintf(buffer, "class: %d\n", info->dev_class);
372 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
373 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
374 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
375 kfree(info);
376}
377
378static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
379 struct snd_info_buffer *buffer)
380{
381 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
382 buffer);
383}
384
385static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
386 struct snd_info_buffer *buffer)
387{
388 snd_pcm_proc_info_read(entry->private_data, buffer);
389}
390
391static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
392 struct snd_info_buffer *buffer)
393{
394 struct snd_pcm_substream *substream = entry->private_data;
395 struct snd_pcm_runtime *runtime;
396
397 mutex_lock(&substream->pcm->open_mutex);
398 runtime = substream->runtime;
399 if (!runtime) {
400 snd_iprintf(buffer, "closed\n");
401 goto unlock;
402 }
403 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
404 snd_iprintf(buffer, "no setup\n");
405 goto unlock;
406 }
407 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
408 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
409 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
410 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
411 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
412 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
413 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
414#if IS_ENABLED(CONFIG_SND_PCM_OSS)
415 if (substream->oss.oss) {
416 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
417 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
418 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
419 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
420 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
421 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
422 }
423#endif
424 unlock:
425 mutex_unlock(&substream->pcm->open_mutex);
426}
427
428static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
429 struct snd_info_buffer *buffer)
430{
431 struct snd_pcm_substream *substream = entry->private_data;
432 struct snd_pcm_runtime *runtime;
433
434 mutex_lock(&substream->pcm->open_mutex);
435 runtime = substream->runtime;
436 if (!runtime) {
437 snd_iprintf(buffer, "closed\n");
438 goto unlock;
439 }
440 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
441 snd_iprintf(buffer, "no setup\n");
442 goto unlock;
443 }
444 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
445 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
446 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
447 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
448 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
449 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
450 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
451 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
452 unlock:
453 mutex_unlock(&substream->pcm->open_mutex);
454}
455
456static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
457 struct snd_info_buffer *buffer)
458{
459 struct snd_pcm_substream *substream = entry->private_data;
460 struct snd_pcm_runtime *runtime;
461 struct snd_pcm_status status;
462 int err;
463
464 mutex_lock(&substream->pcm->open_mutex);
465 runtime = substream->runtime;
466 if (!runtime) {
467 snd_iprintf(buffer, "closed\n");
468 goto unlock;
469 }
470 memset(&status, 0, sizeof(status));
471 err = snd_pcm_status(substream, &status);
472 if (err < 0) {
473 snd_iprintf(buffer, "error %d\n", err);
474 goto unlock;
475 }
476 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
477 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
478 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
479 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
480 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
481 status.tstamp.tv_sec, status.tstamp.tv_nsec);
482 snd_iprintf(buffer, "delay : %ld\n", status.delay);
483 snd_iprintf(buffer, "avail : %ld\n", status.avail);
484 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
485 snd_iprintf(buffer, "-----\n");
486 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
487 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
488 unlock:
489 mutex_unlock(&substream->pcm->open_mutex);
490}
491
492#ifdef CONFIG_SND_PCM_XRUN_DEBUG
493static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
494 struct snd_info_buffer *buffer)
495{
496 struct snd_pcm_substream *substream = entry->private_data;
497
498 snd_pcm_stop_xrun(substream);
499}
500
501static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
502 struct snd_info_buffer *buffer)
503{
504 struct snd_pcm_str *pstr = entry->private_data;
505 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
506}
507
508static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
509 struct snd_info_buffer *buffer)
510{
511 struct snd_pcm_str *pstr = entry->private_data;
512 char line[64];
513 if (!snd_info_get_line(buffer, line, sizeof(line)))
514 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
515}
516#endif
517
518static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
519{
520 struct snd_pcm *pcm = pstr->pcm;
521 struct snd_info_entry *entry;
522 char name[16];
523
524 sprintf(name, "pcm%i%c", pcm->device,
525 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
526 entry = snd_info_create_card_entry(pcm->card, name,
527 pcm->card->proc_root);
528 if (!entry)
529 return -ENOMEM;
530 entry->mode = S_IFDIR | 0555;
531 pstr->proc_root = entry;
532 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
533 if (entry)
534 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
535#ifdef CONFIG_SND_PCM_XRUN_DEBUG
536 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
537 pstr->proc_root);
538 if (entry) {
539 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
540 entry->c.text.write = snd_pcm_xrun_debug_write;
541 entry->mode |= 0200;
542 }
543#endif
544 return 0;
545}
546
547static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
548{
549 snd_info_free_entry(pstr->proc_root);
550 pstr->proc_root = NULL;
551 return 0;
552}
553
554static struct snd_info_entry *
555create_substream_info_entry(struct snd_pcm_substream *substream,
556 const char *name,
557 void (*read)(struct snd_info_entry *,
558 struct snd_info_buffer *))
559{
560 struct snd_info_entry *entry;
561
562 entry = snd_info_create_card_entry(substream->pcm->card, name,
563 substream->proc_root);
564 if (entry)
565 snd_info_set_text_ops(entry, substream, read);
566 return entry;
567}
568
569static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
570{
571 struct snd_info_entry *entry;
572 struct snd_card *card;
573 char name[16];
574
575 card = substream->pcm->card;
576
577 sprintf(name, "sub%i", substream->number);
578 entry = snd_info_create_card_entry(card, name,
579 substream->pstr->proc_root);
580 if (!entry)
581 return -ENOMEM;
582 entry->mode = S_IFDIR | 0555;
583 substream->proc_root = entry;
584
585 create_substream_info_entry(substream, "info",
586 snd_pcm_substream_proc_info_read);
587 create_substream_info_entry(substream, "hw_params",
588 snd_pcm_substream_proc_hw_params_read);
589 create_substream_info_entry(substream, "sw_params",
590 snd_pcm_substream_proc_sw_params_read);
591 create_substream_info_entry(substream, "status",
592 snd_pcm_substream_proc_status_read);
593
594#ifdef CONFIG_SND_PCM_XRUN_DEBUG
595 entry = create_substream_info_entry(substream, "xrun_injection", NULL);
596 if (entry) {
597 entry->c.text.write = snd_pcm_xrun_injection_write;
598 entry->mode = S_IFREG | 0200;
599 }
600#endif
601
602 return 0;
603}
604
605#else
606static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
607static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
608static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
609#endif
610
611static const struct attribute_group *pcm_dev_attr_groups[];
612
613
614
615
616
617#ifdef CONFIG_PM_SLEEP
618static int do_pcm_suspend(struct device *dev)
619{
620 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
621
622 if (!pstr->pcm->no_device_suspend)
623 snd_pcm_suspend_all(pstr->pcm);
624 return 0;
625}
626#endif
627
628static const struct dev_pm_ops pcm_dev_pm_ops = {
629 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
630};
631
632
633static const struct device_type pcm_dev_type = {
634 .name = "pcm",
635 .pm = &pcm_dev_pm_ops,
636};
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
652{
653 int idx, err;
654 struct snd_pcm_str *pstr = &pcm->streams[stream];
655 struct snd_pcm_substream *substream, *prev;
656
657#if IS_ENABLED(CONFIG_SND_PCM_OSS)
658 mutex_init(&pstr->oss.setup_mutex);
659#endif
660 pstr->stream = stream;
661 pstr->pcm = pcm;
662 pstr->substream_count = substream_count;
663 if (!substream_count)
664 return 0;
665
666 snd_device_initialize(&pstr->dev, pcm->card);
667 pstr->dev.groups = pcm_dev_attr_groups;
668 pstr->dev.type = &pcm_dev_type;
669 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
670 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
671
672 if (!pcm->internal) {
673 err = snd_pcm_stream_proc_init(pstr);
674 if (err < 0) {
675 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
676 return err;
677 }
678 }
679 prev = NULL;
680 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
681 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
682 if (!substream)
683 return -ENOMEM;
684 substream->pcm = pcm;
685 substream->pstr = pstr;
686 substream->number = idx;
687 substream->stream = stream;
688 sprintf(substream->name, "subdevice #%i", idx);
689 substream->buffer_bytes_max = UINT_MAX;
690 if (prev == NULL)
691 pstr->substream = substream;
692 else
693 prev->next = substream;
694
695 if (!pcm->internal) {
696 err = snd_pcm_substream_proc_init(substream);
697 if (err < 0) {
698 pcm_err(pcm,
699 "Error in snd_pcm_stream_proc_init\n");
700 if (prev == NULL)
701 pstr->substream = NULL;
702 else
703 prev->next = NULL;
704 kfree(substream);
705 return err;
706 }
707 }
708 substream->group = &substream->self_group;
709 snd_pcm_group_init(&substream->self_group);
710 list_add_tail(&substream->link_list, &substream->self_group.substreams);
711 atomic_set(&substream->mmap_count, 0);
712 prev = substream;
713 }
714 return 0;
715}
716EXPORT_SYMBOL(snd_pcm_new_stream);
717
718static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
719 int playback_count, int capture_count, bool internal,
720 struct snd_pcm **rpcm)
721{
722 struct snd_pcm *pcm;
723 int err;
724 static struct snd_device_ops ops = {
725 .dev_free = snd_pcm_dev_free,
726 .dev_register = snd_pcm_dev_register,
727 .dev_disconnect = snd_pcm_dev_disconnect,
728 };
729 static struct snd_device_ops internal_ops = {
730 .dev_free = snd_pcm_dev_free,
731 };
732
733 if (snd_BUG_ON(!card))
734 return -ENXIO;
735 if (rpcm)
736 *rpcm = NULL;
737 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
738 if (!pcm)
739 return -ENOMEM;
740 pcm->card = card;
741 pcm->device = device;
742 pcm->internal = internal;
743 mutex_init(&pcm->open_mutex);
744 init_waitqueue_head(&pcm->open_wait);
745 INIT_LIST_HEAD(&pcm->list);
746 if (id)
747 strlcpy(pcm->id, id, sizeof(pcm->id));
748
749 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
750 playback_count);
751 if (err < 0)
752 goto free_pcm;
753
754 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
755 if (err < 0)
756 goto free_pcm;
757
758 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
759 internal ? &internal_ops : &ops);
760 if (err < 0)
761 goto free_pcm;
762
763 if (rpcm)
764 *rpcm = pcm;
765 return 0;
766
767free_pcm:
768 snd_pcm_free(pcm);
769 return err;
770}
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788int snd_pcm_new(struct snd_card *card, const char *id, int device,
789 int playback_count, int capture_count, struct snd_pcm **rpcm)
790{
791 return _snd_pcm_new(card, id, device, playback_count, capture_count,
792 false, rpcm);
793}
794EXPORT_SYMBOL(snd_pcm_new);
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
817 int playback_count, int capture_count,
818 struct snd_pcm **rpcm)
819{
820 return _snd_pcm_new(card, id, device, playback_count, capture_count,
821 true, rpcm);
822}
823EXPORT_SYMBOL(snd_pcm_new_internal);
824
825static void free_chmap(struct snd_pcm_str *pstr)
826{
827 if (pstr->chmap_kctl) {
828 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
829 pstr->chmap_kctl = NULL;
830 }
831}
832
833static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
834{
835 struct snd_pcm_substream *substream, *substream_next;
836#if IS_ENABLED(CONFIG_SND_PCM_OSS)
837 struct snd_pcm_oss_setup *setup, *setupn;
838#endif
839
840
841 snd_pcm_stream_proc_done(pstr);
842
843 substream = pstr->substream;
844 while (substream) {
845 substream_next = substream->next;
846 snd_pcm_timer_done(substream);
847 kfree(substream);
848 substream = substream_next;
849 }
850#if IS_ENABLED(CONFIG_SND_PCM_OSS)
851 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
852 setupn = setup->next;
853 kfree(setup->task_name);
854 kfree(setup);
855 }
856#endif
857 free_chmap(pstr);
858 if (pstr->substream_count)
859 put_device(&pstr->dev);
860}
861
862#if IS_ENABLED(CONFIG_SND_PCM_OSS)
863#define pcm_call_notify(pcm, call) \
864 do { \
865 struct snd_pcm_notify *_notify; \
866 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
867 _notify->call(pcm); \
868 } while (0)
869#else
870#define pcm_call_notify(pcm, call) do {} while (0)
871#endif
872
873static int snd_pcm_free(struct snd_pcm *pcm)
874{
875 if (!pcm)
876 return 0;
877 if (!pcm->internal)
878 pcm_call_notify(pcm, n_unregister);
879 if (pcm->private_free)
880 pcm->private_free(pcm);
881 snd_pcm_lib_preallocate_free_for_all(pcm);
882 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
883 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
884 kfree(pcm);
885 return 0;
886}
887
888static int snd_pcm_dev_free(struct snd_device *device)
889{
890 struct snd_pcm *pcm = device->device_data;
891 return snd_pcm_free(pcm);
892}
893
894int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
895 struct file *file,
896 struct snd_pcm_substream **rsubstream)
897{
898 struct snd_pcm_str * pstr;
899 struct snd_pcm_substream *substream;
900 struct snd_pcm_runtime *runtime;
901 struct snd_card *card;
902 int prefer_subdevice;
903 size_t size;
904
905 if (snd_BUG_ON(!pcm || !rsubstream))
906 return -ENXIO;
907 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
908 stream != SNDRV_PCM_STREAM_CAPTURE))
909 return -EINVAL;
910 *rsubstream = NULL;
911 pstr = &pcm->streams[stream];
912 if (pstr->substream == NULL || pstr->substream_count == 0)
913 return -ENODEV;
914
915 card = pcm->card;
916 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
917
918 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
919 int opposite = !stream;
920
921 for (substream = pcm->streams[opposite].substream; substream;
922 substream = substream->next) {
923 if (SUBSTREAM_BUSY(substream))
924 return -EAGAIN;
925 }
926 }
927
928 if (file->f_flags & O_APPEND) {
929 if (prefer_subdevice < 0) {
930 if (pstr->substream_count > 1)
931 return -EINVAL;
932 substream = pstr->substream;
933 } else {
934 for (substream = pstr->substream; substream;
935 substream = substream->next)
936 if (substream->number == prefer_subdevice)
937 break;
938 }
939 if (! substream)
940 return -ENODEV;
941 if (! SUBSTREAM_BUSY(substream))
942 return -EBADFD;
943 substream->ref_count++;
944 *rsubstream = substream;
945 return 0;
946 }
947
948 for (substream = pstr->substream; substream; substream = substream->next) {
949 if (!SUBSTREAM_BUSY(substream) &&
950 (prefer_subdevice == -1 ||
951 substream->number == prefer_subdevice))
952 break;
953 }
954 if (substream == NULL)
955 return -EAGAIN;
956
957 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
958 if (runtime == NULL)
959 return -ENOMEM;
960
961 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
962 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
963 if (runtime->status == NULL) {
964 kfree(runtime);
965 return -ENOMEM;
966 }
967 memset((void*)runtime->status, 0, size);
968
969 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
970 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
971 if (runtime->control == NULL) {
972 snd_free_pages((void*)runtime->status,
973 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
974 kfree(runtime);
975 return -ENOMEM;
976 }
977 memset((void*)runtime->control, 0, size);
978
979 init_waitqueue_head(&runtime->sleep);
980 init_waitqueue_head(&runtime->tsleep);
981
982 runtime->status->state = SNDRV_PCM_STATE_OPEN;
983
984 substream->runtime = runtime;
985 substream->private_data = pcm->private_data;
986 substream->ref_count = 1;
987 substream->f_flags = file->f_flags;
988 substream->pid = get_pid(task_pid(current));
989 pstr->substream_opened++;
990 *rsubstream = substream;
991 return 0;
992}
993
994void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
995{
996 struct snd_pcm_runtime *runtime;
997
998 if (PCM_RUNTIME_CHECK(substream))
999 return;
1000 runtime = substream->runtime;
1001 if (runtime->private_free != NULL)
1002 runtime->private_free(runtime);
1003 snd_free_pages((void*)runtime->status,
1004 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1005 snd_free_pages((void*)runtime->control,
1006 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1007 kfree(runtime->hw_constraints.rules);
1008
1009 if (substream->timer)
1010 spin_lock_irq(&substream->timer->lock);
1011 substream->runtime = NULL;
1012 if (substream->timer)
1013 spin_unlock_irq(&substream->timer->lock);
1014 kfree(runtime);
1015 put_pid(substream->pid);
1016 substream->pid = NULL;
1017 substream->pstr->substream_opened--;
1018}
1019
1020static ssize_t show_pcm_class(struct device *dev,
1021 struct device_attribute *attr, char *buf)
1022{
1023 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1024 struct snd_pcm *pcm = pstr->pcm;
1025 const char *str;
1026 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1027 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1028 [SNDRV_PCM_CLASS_MULTI] = "multi",
1029 [SNDRV_PCM_CLASS_MODEM] = "modem",
1030 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1031 };
1032
1033 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1034 str = "none";
1035 else
1036 str = strs[pcm->dev_class];
1037 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1038}
1039
1040static DEVICE_ATTR(pcm_class, 0444, show_pcm_class, NULL);
1041static struct attribute *pcm_dev_attrs[] = {
1042 &dev_attr_pcm_class.attr,
1043 NULL
1044};
1045
1046static const struct attribute_group pcm_dev_attr_group = {
1047 .attrs = pcm_dev_attrs,
1048};
1049
1050static const struct attribute_group *pcm_dev_attr_groups[] = {
1051 &pcm_dev_attr_group,
1052 NULL
1053};
1054
1055static int snd_pcm_dev_register(struct snd_device *device)
1056{
1057 int cidx, err;
1058 struct snd_pcm_substream *substream;
1059 struct snd_pcm *pcm;
1060
1061 if (snd_BUG_ON(!device || !device->device_data))
1062 return -ENXIO;
1063 pcm = device->device_data;
1064
1065 mutex_lock(®ister_mutex);
1066 err = snd_pcm_add(pcm);
1067 if (err)
1068 goto unlock;
1069 for (cidx = 0; cidx < 2; cidx++) {
1070 int devtype = -1;
1071 if (pcm->streams[cidx].substream == NULL)
1072 continue;
1073 switch (cidx) {
1074 case SNDRV_PCM_STREAM_PLAYBACK:
1075 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1076 break;
1077 case SNDRV_PCM_STREAM_CAPTURE:
1078 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1079 break;
1080 }
1081
1082 err = snd_register_device(devtype, pcm->card, pcm->device,
1083 &snd_pcm_f_ops[cidx], pcm,
1084 &pcm->streams[cidx].dev);
1085 if (err < 0) {
1086 list_del_init(&pcm->list);
1087 goto unlock;
1088 }
1089
1090 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1091 snd_pcm_timer_init(substream);
1092 }
1093
1094 pcm_call_notify(pcm, n_register);
1095
1096 unlock:
1097 mutex_unlock(®ister_mutex);
1098 return err;
1099}
1100
1101static int snd_pcm_dev_disconnect(struct snd_device *device)
1102{
1103 struct snd_pcm *pcm = device->device_data;
1104 struct snd_pcm_substream *substream;
1105 int cidx;
1106
1107 mutex_lock(®ister_mutex);
1108 mutex_lock(&pcm->open_mutex);
1109 wake_up(&pcm->open_wait);
1110 list_del_init(&pcm->list);
1111 for (cidx = 0; cidx < 2; cidx++) {
1112 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1113 snd_pcm_stream_lock_irq(substream);
1114 if (substream->runtime) {
1115 if (snd_pcm_running(substream))
1116 snd_pcm_stop(substream,
1117 SNDRV_PCM_STATE_DISCONNECTED);
1118
1119 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1120 wake_up(&substream->runtime->sleep);
1121 wake_up(&substream->runtime->tsleep);
1122 }
1123 snd_pcm_stream_unlock_irq(substream);
1124 }
1125 }
1126
1127 pcm_call_notify(pcm, n_disconnect);
1128 for (cidx = 0; cidx < 2; cidx++) {
1129 snd_unregister_device(&pcm->streams[cidx].dev);
1130 free_chmap(&pcm->streams[cidx]);
1131 }
1132 mutex_unlock(&pcm->open_mutex);
1133 mutex_unlock(®ister_mutex);
1134 return 0;
1135}
1136
1137#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1148{
1149 struct snd_pcm *pcm;
1150
1151 if (snd_BUG_ON(!notify ||
1152 !notify->n_register ||
1153 !notify->n_unregister ||
1154 !notify->n_disconnect))
1155 return -EINVAL;
1156 mutex_lock(®ister_mutex);
1157 if (nfree) {
1158 list_del(¬ify->list);
1159 list_for_each_entry(pcm, &snd_pcm_devices, list)
1160 notify->n_unregister(pcm);
1161 } else {
1162 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1163 list_for_each_entry(pcm, &snd_pcm_devices, list)
1164 notify->n_register(pcm);
1165 }
1166 mutex_unlock(®ister_mutex);
1167 return 0;
1168}
1169EXPORT_SYMBOL(snd_pcm_notify);
1170#endif
1171
1172#ifdef CONFIG_SND_PROC_FS
1173
1174
1175
1176
1177static void snd_pcm_proc_read(struct snd_info_entry *entry,
1178 struct snd_info_buffer *buffer)
1179{
1180 struct snd_pcm *pcm;
1181
1182 mutex_lock(®ister_mutex);
1183 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1184 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1185 pcm->card->number, pcm->device, pcm->id, pcm->name);
1186 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1187 snd_iprintf(buffer, " : playback %i",
1188 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1189 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1190 snd_iprintf(buffer, " : capture %i",
1191 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1192 snd_iprintf(buffer, "\n");
1193 }
1194 mutex_unlock(®ister_mutex);
1195}
1196
1197static struct snd_info_entry *snd_pcm_proc_entry;
1198
1199static void snd_pcm_proc_init(void)
1200{
1201 struct snd_info_entry *entry;
1202
1203 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1204 if (entry) {
1205 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1206 if (snd_info_register(entry) < 0) {
1207 snd_info_free_entry(entry);
1208 entry = NULL;
1209 }
1210 }
1211 snd_pcm_proc_entry = entry;
1212}
1213
1214static void snd_pcm_proc_done(void)
1215{
1216 snd_info_free_entry(snd_pcm_proc_entry);
1217}
1218
1219#else
1220#define snd_pcm_proc_init()
1221#define snd_pcm_proc_done()
1222#endif
1223
1224
1225
1226
1227
1228
1229static int __init alsa_pcm_init(void)
1230{
1231 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1232 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1233 snd_pcm_proc_init();
1234 return 0;
1235}
1236
1237static void __exit alsa_pcm_exit(void)
1238{
1239 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1240 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1241 snd_pcm_proc_done();
1242}
1243
1244module_init(alsa_pcm_init)
1245module_exit(alsa_pcm_exit)
1246
