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7#include <linux/init.h>
8#include <linux/slab.h>
9#include <linux/module.h>
10#include <linux/time.h>
11#include <linux/mutex.h>
12#include <linux/device.h>
13#include <linux/nospec.h>
14#include <sound/core.h>
15#include <sound/minors.h>
16#include <sound/pcm.h>
17#include <sound/timer.h>
18#include <sound/control.h>
19#include <sound/info.h>
20
21#include "pcm_local.h"
22
23MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
24MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
25MODULE_LICENSE("GPL");
26
27static LIST_HEAD(snd_pcm_devices);
28static DEFINE_MUTEX(register_mutex);
29#if IS_ENABLED(CONFIG_SND_PCM_OSS)
30static LIST_HEAD(snd_pcm_notify_list);
31#endif
32
33static int snd_pcm_free(struct snd_pcm *pcm);
34static int snd_pcm_dev_free(struct snd_device *device);
35static int snd_pcm_dev_register(struct snd_device *device);
36static int snd_pcm_dev_disconnect(struct snd_device *device);
37
38static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
39{
40 struct snd_pcm *pcm;
41
42 list_for_each_entry(pcm, &snd_pcm_devices, list) {
43 if (pcm->card == card && pcm->device == device)
44 return pcm;
45 }
46 return NULL;
47}
48
49static int snd_pcm_next(struct snd_card *card, int device)
50{
51 struct snd_pcm *pcm;
52
53 list_for_each_entry(pcm, &snd_pcm_devices, list) {
54 if (pcm->card == card && pcm->device > device)
55 return pcm->device;
56 else if (pcm->card->number > card->number)
57 return -1;
58 }
59 return -1;
60}
61
62static int snd_pcm_add(struct snd_pcm *newpcm)
63{
64 struct snd_pcm *pcm;
65
66 if (newpcm->internal)
67 return 0;
68
69 list_for_each_entry(pcm, &snd_pcm_devices, list) {
70 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
71 return -EBUSY;
72 if (pcm->card->number > newpcm->card->number ||
73 (pcm->card == newpcm->card &&
74 pcm->device > newpcm->device)) {
75 list_add(&newpcm->list, pcm->list.prev);
76 return 0;
77 }
78 }
79 list_add_tail(&newpcm->list, &snd_pcm_devices);
80 return 0;
81}
82
83static int snd_pcm_control_ioctl(struct snd_card *card,
84 struct snd_ctl_file *control,
85 unsigned int cmd, unsigned long arg)
86{
87 switch (cmd) {
88 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
89 {
90 int device;
91
92 if (get_user(device, (int __user *)arg))
93 return -EFAULT;
94 mutex_lock(®ister_mutex);
95 device = snd_pcm_next(card, device);
96 mutex_unlock(®ister_mutex);
97 if (put_user(device, (int __user *)arg))
98 return -EFAULT;
99 return 0;
100 }
101 case SNDRV_CTL_IOCTL_PCM_INFO:
102 {
103 struct snd_pcm_info __user *info;
104 unsigned int device, subdevice;
105 int stream;
106 struct snd_pcm *pcm;
107 struct snd_pcm_str *pstr;
108 struct snd_pcm_substream *substream;
109 int err;
110
111 info = (struct snd_pcm_info __user *)arg;
112 if (get_user(device, &info->device))
113 return -EFAULT;
114 if (get_user(stream, &info->stream))
115 return -EFAULT;
116 if (stream < 0 || stream > 1)
117 return -EINVAL;
118 stream = array_index_nospec(stream, 2);
119 if (get_user(subdevice, &info->subdevice))
120 return -EFAULT;
121 mutex_lock(®ister_mutex);
122 pcm = snd_pcm_get(card, device);
123 if (pcm == NULL) {
124 err = -ENXIO;
125 goto _error;
126 }
127 pstr = &pcm->streams[stream];
128 if (pstr->substream_count == 0) {
129 err = -ENOENT;
130 goto _error;
131 }
132 if (subdevice >= pstr->substream_count) {
133 err = -ENXIO;
134 goto _error;
135 }
136 for (substream = pstr->substream; substream;
137 substream = substream->next)
138 if (substream->number == (int)subdevice)
139 break;
140 if (substream == NULL) {
141 err = -ENXIO;
142 goto _error;
143 }
144 mutex_lock(&pcm->open_mutex);
145 err = snd_pcm_info_user(substream, info);
146 mutex_unlock(&pcm->open_mutex);
147 _error:
148 mutex_unlock(®ister_mutex);
149 return err;
150 }
151 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
152 {
153 int val;
154
155 if (get_user(val, (int __user *)arg))
156 return -EFAULT;
157 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
158 return 0;
159 }
160 }
161 return -ENOIOCTLCMD;
162}
163
164#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
165
166static const char * const snd_pcm_format_names[] = {
167 FORMAT(S8),
168 FORMAT(U8),
169 FORMAT(S16_LE),
170 FORMAT(S16_BE),
171 FORMAT(U16_LE),
172 FORMAT(U16_BE),
173 FORMAT(S24_LE),
174 FORMAT(S24_BE),
175 FORMAT(U24_LE),
176 FORMAT(U24_BE),
177 FORMAT(S32_LE),
178 FORMAT(S32_BE),
179 FORMAT(U32_LE),
180 FORMAT(U32_BE),
181 FORMAT(FLOAT_LE),
182 FORMAT(FLOAT_BE),
183 FORMAT(FLOAT64_LE),
184 FORMAT(FLOAT64_BE),
185 FORMAT(IEC958_SUBFRAME_LE),
186 FORMAT(IEC958_SUBFRAME_BE),
187 FORMAT(MU_LAW),
188 FORMAT(A_LAW),
189 FORMAT(IMA_ADPCM),
190 FORMAT(MPEG),
191 FORMAT(GSM),
192 FORMAT(SPECIAL),
193 FORMAT(S24_3LE),
194 FORMAT(S24_3BE),
195 FORMAT(U24_3LE),
196 FORMAT(U24_3BE),
197 FORMAT(S20_3LE),
198 FORMAT(S20_3BE),
199 FORMAT(U20_3LE),
200 FORMAT(U20_3BE),
201 FORMAT(S18_3LE),
202 FORMAT(S18_3BE),
203 FORMAT(U18_3LE),
204 FORMAT(U18_3BE),
205 FORMAT(G723_24),
206 FORMAT(G723_24_1B),
207 FORMAT(G723_40),
208 FORMAT(G723_40_1B),
209 FORMAT(DSD_U8),
210 FORMAT(DSD_U16_LE),
211 FORMAT(DSD_U32_LE),
212 FORMAT(DSD_U16_BE),
213 FORMAT(DSD_U32_BE),
214};
215
216
217
218
219
220const char *snd_pcm_format_name(snd_pcm_format_t format)
221{
222 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
223 return "Unknown";
224 return snd_pcm_format_names[(__force unsigned int)format];
225}
226EXPORT_SYMBOL_GPL(snd_pcm_format_name);
227
228#ifdef CONFIG_SND_VERBOSE_PROCFS
229
230#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
231#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
232#define READY(v) [SNDRV_PCM_READY_##v] = #v
233#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
234#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
235#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
236#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
237#define START(v) [SNDRV_PCM_START_##v] = #v
238#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
239
240static const char * const snd_pcm_stream_names[] = {
241 STREAM(PLAYBACK),
242 STREAM(CAPTURE),
243};
244
245static const char * const snd_pcm_state_names[] = {
246 STATE(OPEN),
247 STATE(SETUP),
248 STATE(PREPARED),
249 STATE(RUNNING),
250 STATE(XRUN),
251 STATE(DRAINING),
252 STATE(PAUSED),
253 STATE(SUSPENDED),
254};
255
256static const char * const snd_pcm_access_names[] = {
257 ACCESS(MMAP_INTERLEAVED),
258 ACCESS(MMAP_NONINTERLEAVED),
259 ACCESS(MMAP_COMPLEX),
260 ACCESS(RW_INTERLEAVED),
261 ACCESS(RW_NONINTERLEAVED),
262};
263
264static const char * const snd_pcm_subformat_names[] = {
265 SUBFORMAT(STD),
266};
267
268static const char * const snd_pcm_tstamp_mode_names[] = {
269 TSTAMP(NONE),
270 TSTAMP(ENABLE),
271};
272
273static const char *snd_pcm_stream_name(int stream)
274{
275 return snd_pcm_stream_names[stream];
276}
277
278static const char *snd_pcm_access_name(snd_pcm_access_t access)
279{
280 return snd_pcm_access_names[(__force int)access];
281}
282
283static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
284{
285 return snd_pcm_subformat_names[(__force int)subformat];
286}
287
288static const char *snd_pcm_tstamp_mode_name(int mode)
289{
290 return snd_pcm_tstamp_mode_names[mode];
291}
292
293static const char *snd_pcm_state_name(snd_pcm_state_t state)
294{
295 return snd_pcm_state_names[(__force int)state];
296}
297
298#if IS_ENABLED(CONFIG_SND_PCM_OSS)
299#include <linux/soundcard.h>
300
301static const char *snd_pcm_oss_format_name(int format)
302{
303 switch (format) {
304 case AFMT_MU_LAW:
305 return "MU_LAW";
306 case AFMT_A_LAW:
307 return "A_LAW";
308 case AFMT_IMA_ADPCM:
309 return "IMA_ADPCM";
310 case AFMT_U8:
311 return "U8";
312 case AFMT_S16_LE:
313 return "S16_LE";
314 case AFMT_S16_BE:
315 return "S16_BE";
316 case AFMT_S8:
317 return "S8";
318 case AFMT_U16_LE:
319 return "U16_LE";
320 case AFMT_U16_BE:
321 return "U16_BE";
322 case AFMT_MPEG:
323 return "MPEG";
324 default:
325 return "unknown";
326 }
327}
328#endif
329
330static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
331 struct snd_info_buffer *buffer)
332{
333 struct snd_pcm_info *info;
334 int err;
335
336 if (! substream)
337 return;
338
339 info = kmalloc(sizeof(*info), GFP_KERNEL);
340 if (!info)
341 return;
342
343 err = snd_pcm_info(substream, info);
344 if (err < 0) {
345 snd_iprintf(buffer, "error %d\n", err);
346 kfree(info);
347 return;
348 }
349 snd_iprintf(buffer, "card: %d\n", info->card);
350 snd_iprintf(buffer, "device: %d\n", info->device);
351 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
352 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
353 snd_iprintf(buffer, "id: %s\n", info->id);
354 snd_iprintf(buffer, "name: %s\n", info->name);
355 snd_iprintf(buffer, "subname: %s\n", info->subname);
356 snd_iprintf(buffer, "class: %d\n", info->dev_class);
357 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
358 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
359 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
360 kfree(info);
361}
362
363static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
364 struct snd_info_buffer *buffer)
365{
366 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
367 buffer);
368}
369
370static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
371 struct snd_info_buffer *buffer)
372{
373 snd_pcm_proc_info_read(entry->private_data, buffer);
374}
375
376static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
378{
379 struct snd_pcm_substream *substream = entry->private_data;
380 struct snd_pcm_runtime *runtime;
381
382 mutex_lock(&substream->pcm->open_mutex);
383 runtime = substream->runtime;
384 if (!runtime) {
385 snd_iprintf(buffer, "closed\n");
386 goto unlock;
387 }
388 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
389 snd_iprintf(buffer, "no setup\n");
390 goto unlock;
391 }
392 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
393 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
394 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
395 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
396 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
397 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
398 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
399#if IS_ENABLED(CONFIG_SND_PCM_OSS)
400 if (substream->oss.oss) {
401 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
402 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
403 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
404 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
405 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
406 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
407 }
408#endif
409 unlock:
410 mutex_unlock(&substream->pcm->open_mutex);
411}
412
413static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
414 struct snd_info_buffer *buffer)
415{
416 struct snd_pcm_substream *substream = entry->private_data;
417 struct snd_pcm_runtime *runtime;
418
419 mutex_lock(&substream->pcm->open_mutex);
420 runtime = substream->runtime;
421 if (!runtime) {
422 snd_iprintf(buffer, "closed\n");
423 goto unlock;
424 }
425 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
426 snd_iprintf(buffer, "no setup\n");
427 goto unlock;
428 }
429 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
430 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
431 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
432 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
433 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
434 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
435 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
436 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
437 unlock:
438 mutex_unlock(&substream->pcm->open_mutex);
439}
440
441static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
442 struct snd_info_buffer *buffer)
443{
444 struct snd_pcm_substream *substream = entry->private_data;
445 struct snd_pcm_runtime *runtime;
446 struct snd_pcm_status64 status;
447 int err;
448
449 mutex_lock(&substream->pcm->open_mutex);
450 runtime = substream->runtime;
451 if (!runtime) {
452 snd_iprintf(buffer, "closed\n");
453 goto unlock;
454 }
455 memset(&status, 0, sizeof(status));
456 err = snd_pcm_status64(substream, &status);
457 if (err < 0) {
458 snd_iprintf(buffer, "error %d\n", err);
459 goto unlock;
460 }
461 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
462 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
463 snd_iprintf(buffer, "trigger_time: %lld.%09lld\n",
464 status.trigger_tstamp_sec, status.trigger_tstamp_nsec);
465 snd_iprintf(buffer, "tstamp : %lld.%09lld\n",
466 status.tstamp_sec, status.tstamp_nsec);
467 snd_iprintf(buffer, "delay : %ld\n", status.delay);
468 snd_iprintf(buffer, "avail : %ld\n", status.avail);
469 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
470 snd_iprintf(buffer, "-----\n");
471 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
472 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
473 unlock:
474 mutex_unlock(&substream->pcm->open_mutex);
475}
476
477#ifdef CONFIG_SND_PCM_XRUN_DEBUG
478static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
479 struct snd_info_buffer *buffer)
480{
481 struct snd_pcm_substream *substream = entry->private_data;
482
483 snd_pcm_stop_xrun(substream);
484}
485
486static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
487 struct snd_info_buffer *buffer)
488{
489 struct snd_pcm_str *pstr = entry->private_data;
490 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
491}
492
493static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
494 struct snd_info_buffer *buffer)
495{
496 struct snd_pcm_str *pstr = entry->private_data;
497 char line[64];
498 if (!snd_info_get_line(buffer, line, sizeof(line)))
499 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
500}
501#endif
502
503static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
504{
505 struct snd_pcm *pcm = pstr->pcm;
506 struct snd_info_entry *entry;
507 char name[16];
508
509 sprintf(name, "pcm%i%c", pcm->device,
510 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
511 entry = snd_info_create_card_entry(pcm->card, name,
512 pcm->card->proc_root);
513 if (!entry)
514 return -ENOMEM;
515 entry->mode = S_IFDIR | 0555;
516 pstr->proc_root = entry;
517 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
518 if (entry)
519 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
520#ifdef CONFIG_SND_PCM_XRUN_DEBUG
521 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
522 pstr->proc_root);
523 if (entry) {
524 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
525 entry->c.text.write = snd_pcm_xrun_debug_write;
526 entry->mode |= 0200;
527 }
528#endif
529 return 0;
530}
531
532static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
533{
534 snd_info_free_entry(pstr->proc_root);
535 pstr->proc_root = NULL;
536 return 0;
537}
538
539static struct snd_info_entry *
540create_substream_info_entry(struct snd_pcm_substream *substream,
541 const char *name,
542 void (*read)(struct snd_info_entry *,
543 struct snd_info_buffer *))
544{
545 struct snd_info_entry *entry;
546
547 entry = snd_info_create_card_entry(substream->pcm->card, name,
548 substream->proc_root);
549 if (entry)
550 snd_info_set_text_ops(entry, substream, read);
551 return entry;
552}
553
554static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
555{
556 struct snd_info_entry *entry;
557 struct snd_card *card;
558 char name[16];
559
560 card = substream->pcm->card;
561
562 sprintf(name, "sub%i", substream->number);
563 entry = snd_info_create_card_entry(card, name,
564 substream->pstr->proc_root);
565 if (!entry)
566 return -ENOMEM;
567 entry->mode = S_IFDIR | 0555;
568 substream->proc_root = entry;
569
570 create_substream_info_entry(substream, "info",
571 snd_pcm_substream_proc_info_read);
572 create_substream_info_entry(substream, "hw_params",
573 snd_pcm_substream_proc_hw_params_read);
574 create_substream_info_entry(substream, "sw_params",
575 snd_pcm_substream_proc_sw_params_read);
576 create_substream_info_entry(substream, "status",
577 snd_pcm_substream_proc_status_read);
578
579#ifdef CONFIG_SND_PCM_XRUN_DEBUG
580 entry = create_substream_info_entry(substream, "xrun_injection", NULL);
581 if (entry) {
582 entry->c.text.write = snd_pcm_xrun_injection_write;
583 entry->mode = S_IFREG | 0200;
584 }
585#endif
586
587 return 0;
588}
589
590#else
591static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
592static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
593static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
594#endif
595
596static const struct attribute_group *pcm_dev_attr_groups[];
597
598
599
600
601
602#ifdef CONFIG_PM_SLEEP
603static int do_pcm_suspend(struct device *dev)
604{
605 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
606
607 if (!pstr->pcm->no_device_suspend)
608 snd_pcm_suspend_all(pstr->pcm);
609 return 0;
610}
611#endif
612
613static const struct dev_pm_ops pcm_dev_pm_ops = {
614 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
615};
616
617
618static const struct device_type pcm_dev_type = {
619 .name = "pcm",
620 .pm = &pcm_dev_pm_ops,
621};
622
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631
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633
634
635
636int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
637{
638 int idx, err;
639 struct snd_pcm_str *pstr = &pcm->streams[stream];
640 struct snd_pcm_substream *substream, *prev;
641
642#if IS_ENABLED(CONFIG_SND_PCM_OSS)
643 mutex_init(&pstr->oss.setup_mutex);
644#endif
645 pstr->stream = stream;
646 pstr->pcm = pcm;
647 pstr->substream_count = substream_count;
648 if (!substream_count)
649 return 0;
650
651 snd_device_initialize(&pstr->dev, pcm->card);
652 pstr->dev.groups = pcm_dev_attr_groups;
653 pstr->dev.type = &pcm_dev_type;
654 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
655 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
656
657 if (!pcm->internal) {
658 err = snd_pcm_stream_proc_init(pstr);
659 if (err < 0) {
660 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
661 return err;
662 }
663 }
664 prev = NULL;
665 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
666 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
667 if (!substream)
668 return -ENOMEM;
669 substream->pcm = pcm;
670 substream->pstr = pstr;
671 substream->number = idx;
672 substream->stream = stream;
673 sprintf(substream->name, "subdevice #%i", idx);
674 substream->buffer_bytes_max = UINT_MAX;
675 if (prev == NULL)
676 pstr->substream = substream;
677 else
678 prev->next = substream;
679
680 if (!pcm->internal) {
681 err = snd_pcm_substream_proc_init(substream);
682 if (err < 0) {
683 pcm_err(pcm,
684 "Error in snd_pcm_stream_proc_init\n");
685 if (prev == NULL)
686 pstr->substream = NULL;
687 else
688 prev->next = NULL;
689 kfree(substream);
690 return err;
691 }
692 }
693 substream->group = &substream->self_group;
694 snd_pcm_group_init(&substream->self_group);
695 list_add_tail(&substream->link_list, &substream->self_group.substreams);
696 atomic_set(&substream->mmap_count, 0);
697 prev = substream;
698 }
699 return 0;
700}
701EXPORT_SYMBOL(snd_pcm_new_stream);
702
703static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
704 int playback_count, int capture_count, bool internal,
705 struct snd_pcm **rpcm)
706{
707 struct snd_pcm *pcm;
708 int err;
709 static const struct snd_device_ops ops = {
710 .dev_free = snd_pcm_dev_free,
711 .dev_register = snd_pcm_dev_register,
712 .dev_disconnect = snd_pcm_dev_disconnect,
713 };
714 static const struct snd_device_ops internal_ops = {
715 .dev_free = snd_pcm_dev_free,
716 };
717
718 if (snd_BUG_ON(!card))
719 return -ENXIO;
720 if (rpcm)
721 *rpcm = NULL;
722 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
723 if (!pcm)
724 return -ENOMEM;
725 pcm->card = card;
726 pcm->device = device;
727 pcm->internal = internal;
728 mutex_init(&pcm->open_mutex);
729 init_waitqueue_head(&pcm->open_wait);
730 INIT_LIST_HEAD(&pcm->list);
731 if (id)
732 strscpy(pcm->id, id, sizeof(pcm->id));
733
734 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
735 playback_count);
736 if (err < 0)
737 goto free_pcm;
738
739 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
740 if (err < 0)
741 goto free_pcm;
742
743 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
744 internal ? &internal_ops : &ops);
745 if (err < 0)
746 goto free_pcm;
747
748 if (rpcm)
749 *rpcm = pcm;
750 return 0;
751
752free_pcm:
753 snd_pcm_free(pcm);
754 return err;
755}
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773int snd_pcm_new(struct snd_card *card, const char *id, int device,
774 int playback_count, int capture_count, struct snd_pcm **rpcm)
775{
776 return _snd_pcm_new(card, id, device, playback_count, capture_count,
777 false, rpcm);
778}
779EXPORT_SYMBOL(snd_pcm_new);
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
802 int playback_count, int capture_count,
803 struct snd_pcm **rpcm)
804{
805 return _snd_pcm_new(card, id, device, playback_count, capture_count,
806 true, rpcm);
807}
808EXPORT_SYMBOL(snd_pcm_new_internal);
809
810static void free_chmap(struct snd_pcm_str *pstr)
811{
812 if (pstr->chmap_kctl) {
813 struct snd_card *card = pstr->pcm->card;
814
815 down_write(&card->controls_rwsem);
816 snd_ctl_remove(card, pstr->chmap_kctl);
817 up_write(&card->controls_rwsem);
818 pstr->chmap_kctl = NULL;
819 }
820}
821
822static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
823{
824 struct snd_pcm_substream *substream, *substream_next;
825#if IS_ENABLED(CONFIG_SND_PCM_OSS)
826 struct snd_pcm_oss_setup *setup, *setupn;
827#endif
828
829
830 snd_pcm_stream_proc_done(pstr);
831
832 substream = pstr->substream;
833 while (substream) {
834 substream_next = substream->next;
835 snd_pcm_timer_done(substream);
836 kfree(substream);
837 substream = substream_next;
838 }
839#if IS_ENABLED(CONFIG_SND_PCM_OSS)
840 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
841 setupn = setup->next;
842 kfree(setup->task_name);
843 kfree(setup);
844 }
845#endif
846 free_chmap(pstr);
847 if (pstr->substream_count)
848 put_device(&pstr->dev);
849}
850
851#if IS_ENABLED(CONFIG_SND_PCM_OSS)
852#define pcm_call_notify(pcm, call) \
853 do { \
854 struct snd_pcm_notify *_notify; \
855 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
856 _notify->call(pcm); \
857 } while (0)
858#else
859#define pcm_call_notify(pcm, call) do {} while (0)
860#endif
861
862static int snd_pcm_free(struct snd_pcm *pcm)
863{
864 if (!pcm)
865 return 0;
866 if (!pcm->internal)
867 pcm_call_notify(pcm, n_unregister);
868 if (pcm->private_free)
869 pcm->private_free(pcm);
870 snd_pcm_lib_preallocate_free_for_all(pcm);
871 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
872 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
873 kfree(pcm);
874 return 0;
875}
876
877static int snd_pcm_dev_free(struct snd_device *device)
878{
879 struct snd_pcm *pcm = device->device_data;
880 return snd_pcm_free(pcm);
881}
882
883int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
884 struct file *file,
885 struct snd_pcm_substream **rsubstream)
886{
887 struct snd_pcm_str * pstr;
888 struct snd_pcm_substream *substream;
889 struct snd_pcm_runtime *runtime;
890 struct snd_card *card;
891 int prefer_subdevice;
892 size_t size;
893
894 if (snd_BUG_ON(!pcm || !rsubstream))
895 return -ENXIO;
896 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
897 stream != SNDRV_PCM_STREAM_CAPTURE))
898 return -EINVAL;
899 *rsubstream = NULL;
900 pstr = &pcm->streams[stream];
901 if (pstr->substream == NULL || pstr->substream_count == 0)
902 return -ENODEV;
903
904 card = pcm->card;
905 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
906
907 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
908 int opposite = !stream;
909
910 for (substream = pcm->streams[opposite].substream; substream;
911 substream = substream->next) {
912 if (SUBSTREAM_BUSY(substream))
913 return -EAGAIN;
914 }
915 }
916
917 if (file->f_flags & O_APPEND) {
918 if (prefer_subdevice < 0) {
919 if (pstr->substream_count > 1)
920 return -EINVAL;
921 substream = pstr->substream;
922 } else {
923 for (substream = pstr->substream; substream;
924 substream = substream->next)
925 if (substream->number == prefer_subdevice)
926 break;
927 }
928 if (! substream)
929 return -ENODEV;
930 if (! SUBSTREAM_BUSY(substream))
931 return -EBADFD;
932 substream->ref_count++;
933 *rsubstream = substream;
934 return 0;
935 }
936
937 for (substream = pstr->substream; substream; substream = substream->next) {
938 if (!SUBSTREAM_BUSY(substream) &&
939 (prefer_subdevice == -1 ||
940 substream->number == prefer_subdevice))
941 break;
942 }
943 if (substream == NULL)
944 return -EAGAIN;
945
946 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
947 if (runtime == NULL)
948 return -ENOMEM;
949
950 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
951 runtime->status = alloc_pages_exact(size, GFP_KERNEL);
952 if (runtime->status == NULL) {
953 kfree(runtime);
954 return -ENOMEM;
955 }
956 memset(runtime->status, 0, size);
957
958 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
959 runtime->control = alloc_pages_exact(size, GFP_KERNEL);
960 if (runtime->control == NULL) {
961 free_pages_exact(runtime->status,
962 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
963 kfree(runtime);
964 return -ENOMEM;
965 }
966 memset(runtime->control, 0, size);
967
968 init_waitqueue_head(&runtime->sleep);
969 init_waitqueue_head(&runtime->tsleep);
970
971 runtime->status->state = SNDRV_PCM_STATE_OPEN;
972 mutex_init(&runtime->buffer_mutex);
973 atomic_set(&runtime->buffer_accessing, 0);
974
975 substream->runtime = runtime;
976 substream->private_data = pcm->private_data;
977 substream->ref_count = 1;
978 substream->f_flags = file->f_flags;
979 substream->pid = get_pid(task_pid(current));
980 pstr->substream_opened++;
981 *rsubstream = substream;
982 return 0;
983}
984
985void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
986{
987 struct snd_pcm_runtime *runtime;
988
989 if (PCM_RUNTIME_CHECK(substream))
990 return;
991 runtime = substream->runtime;
992 if (runtime->private_free != NULL)
993 runtime->private_free(runtime);
994 free_pages_exact(runtime->status,
995 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
996 free_pages_exact(runtime->control,
997 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
998 kfree(runtime->hw_constraints.rules);
999
1000 if (substream->timer) {
1001 spin_lock_irq(&substream->timer->lock);
1002 substream->runtime = NULL;
1003 spin_unlock_irq(&substream->timer->lock);
1004 } else {
1005 substream->runtime = NULL;
1006 }
1007 mutex_destroy(&runtime->buffer_mutex);
1008 kfree(runtime);
1009 put_pid(substream->pid);
1010 substream->pid = NULL;
1011 substream->pstr->substream_opened--;
1012}
1013
1014static ssize_t pcm_class_show(struct device *dev,
1015 struct device_attribute *attr, char *buf)
1016{
1017 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1018 struct snd_pcm *pcm = pstr->pcm;
1019 const char *str;
1020 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1021 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1022 [SNDRV_PCM_CLASS_MULTI] = "multi",
1023 [SNDRV_PCM_CLASS_MODEM] = "modem",
1024 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1025 };
1026
1027 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1028 str = "none";
1029 else
1030 str = strs[pcm->dev_class];
1031 return sprintf(buf, "%s\n", str);
1032}
1033
1034static DEVICE_ATTR_RO(pcm_class);
1035static struct attribute *pcm_dev_attrs[] = {
1036 &dev_attr_pcm_class.attr,
1037 NULL
1038};
1039
1040static const struct attribute_group pcm_dev_attr_group = {
1041 .attrs = pcm_dev_attrs,
1042};
1043
1044static const struct attribute_group *pcm_dev_attr_groups[] = {
1045 &pcm_dev_attr_group,
1046 NULL
1047};
1048
1049static int snd_pcm_dev_register(struct snd_device *device)
1050{
1051 int cidx, err;
1052 struct snd_pcm_substream *substream;
1053 struct snd_pcm *pcm;
1054
1055 if (snd_BUG_ON(!device || !device->device_data))
1056 return -ENXIO;
1057 pcm = device->device_data;
1058
1059 mutex_lock(®ister_mutex);
1060 err = snd_pcm_add(pcm);
1061 if (err)
1062 goto unlock;
1063 for (cidx = 0; cidx < 2; cidx++) {
1064 int devtype = -1;
1065 if (pcm->streams[cidx].substream == NULL)
1066 continue;
1067 switch (cidx) {
1068 case SNDRV_PCM_STREAM_PLAYBACK:
1069 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1070 break;
1071 case SNDRV_PCM_STREAM_CAPTURE:
1072 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1073 break;
1074 }
1075
1076 err = snd_register_device(devtype, pcm->card, pcm->device,
1077 &snd_pcm_f_ops[cidx], pcm,
1078 &pcm->streams[cidx].dev);
1079 if (err < 0) {
1080 list_del_init(&pcm->list);
1081 goto unlock;
1082 }
1083
1084 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1085 snd_pcm_timer_init(substream);
1086 }
1087
1088 pcm_call_notify(pcm, n_register);
1089
1090 unlock:
1091 mutex_unlock(®ister_mutex);
1092 return err;
1093}
1094
1095static int snd_pcm_dev_disconnect(struct snd_device *device)
1096{
1097 struct snd_pcm *pcm = device->device_data;
1098 struct snd_pcm_substream *substream;
1099 int cidx;
1100
1101 mutex_lock(®ister_mutex);
1102 mutex_lock(&pcm->open_mutex);
1103 wake_up(&pcm->open_wait);
1104 list_del_init(&pcm->list);
1105
1106 for_each_pcm_substream(pcm, cidx, substream) {
1107 snd_pcm_stream_lock_irq(substream);
1108 if (substream->runtime) {
1109 if (snd_pcm_running(substream))
1110 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
1111
1112 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1113 wake_up(&substream->runtime->sleep);
1114 wake_up(&substream->runtime->tsleep);
1115 }
1116 snd_pcm_stream_unlock_irq(substream);
1117 }
1118
1119 for_each_pcm_substream(pcm, cidx, substream)
1120 snd_pcm_sync_stop(substream, false);
1121
1122 pcm_call_notify(pcm, n_disconnect);
1123 for (cidx = 0; cidx < 2; cidx++) {
1124 snd_unregister_device(&pcm->streams[cidx].dev);
1125 free_chmap(&pcm->streams[cidx]);
1126 }
1127 mutex_unlock(&pcm->open_mutex);
1128 mutex_unlock(®ister_mutex);
1129 return 0;
1130}
1131
1132#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1143{
1144 struct snd_pcm *pcm;
1145
1146 if (snd_BUG_ON(!notify ||
1147 !notify->n_register ||
1148 !notify->n_unregister ||
1149 !notify->n_disconnect))
1150 return -EINVAL;
1151 mutex_lock(®ister_mutex);
1152 if (nfree) {
1153 list_del(¬ify->list);
1154 list_for_each_entry(pcm, &snd_pcm_devices, list)
1155 notify->n_unregister(pcm);
1156 } else {
1157 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1158 list_for_each_entry(pcm, &snd_pcm_devices, list)
1159 notify->n_register(pcm);
1160 }
1161 mutex_unlock(®ister_mutex);
1162 return 0;
1163}
1164EXPORT_SYMBOL(snd_pcm_notify);
1165#endif
1166
1167#ifdef CONFIG_SND_PROC_FS
1168
1169
1170
1171
1172static void snd_pcm_proc_read(struct snd_info_entry *entry,
1173 struct snd_info_buffer *buffer)
1174{
1175 struct snd_pcm *pcm;
1176
1177 mutex_lock(®ister_mutex);
1178 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1179 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1180 pcm->card->number, pcm->device, pcm->id, pcm->name);
1181 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1182 snd_iprintf(buffer, " : playback %i",
1183 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1184 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1185 snd_iprintf(buffer, " : capture %i",
1186 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1187 snd_iprintf(buffer, "\n");
1188 }
1189 mutex_unlock(®ister_mutex);
1190}
1191
1192static struct snd_info_entry *snd_pcm_proc_entry;
1193
1194static void snd_pcm_proc_init(void)
1195{
1196 struct snd_info_entry *entry;
1197
1198 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1199 if (entry) {
1200 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1201 if (snd_info_register(entry) < 0) {
1202 snd_info_free_entry(entry);
1203 entry = NULL;
1204 }
1205 }
1206 snd_pcm_proc_entry = entry;
1207}
1208
1209static void snd_pcm_proc_done(void)
1210{
1211 snd_info_free_entry(snd_pcm_proc_entry);
1212}
1213
1214#else
1215#define snd_pcm_proc_init()
1216#define snd_pcm_proc_done()
1217#endif
1218
1219
1220
1221
1222
1223
1224static int __init alsa_pcm_init(void)
1225{
1226 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1227 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1228 snd_pcm_proc_init();
1229 return 0;
1230}
1231
1232static void __exit alsa_pcm_exit(void)
1233{
1234 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1235 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1236 snd_pcm_proc_done();
1237}
1238
1239module_init(alsa_pcm_init)
1240module_exit(alsa_pcm_exit)
1241
