Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
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 scoped_guard(mutex, ®ister_mutex)
95 device = snd_pcm_next(card, device);
96 if (put_user(device, (int __user *)arg))
97 return -EFAULT;
98 return 0;
99 }
100 case SNDRV_CTL_IOCTL_PCM_INFO:
101 {
102 struct snd_pcm_info __user *info;
103 unsigned int device, subdevice;
104 int stream;
105 struct snd_pcm *pcm;
106 struct snd_pcm_str *pstr;
107 struct snd_pcm_substream *substream;
108
109 info = (struct snd_pcm_info __user *)arg;
110 if (get_user(device, &info->device))
111 return -EFAULT;
112 if (get_user(stream, &info->stream))
113 return -EFAULT;
114 if (stream < 0 || stream > 1)
115 return -EINVAL;
116 stream = array_index_nospec(stream, 2);
117 if (get_user(subdevice, &info->subdevice))
118 return -EFAULT;
119 guard(mutex)(®ister_mutex);
120 pcm = snd_pcm_get(card, device);
121 if (pcm == NULL)
122 return -ENXIO;
123 pstr = &pcm->streams[stream];
124 if (pstr->substream_count == 0)
125 return -ENOENT;
126 if (subdevice >= pstr->substream_count)
127 return -ENXIO;
128 for (substream = pstr->substream; substream;
129 substream = substream->next)
130 if (substream->number == (int)subdevice)
131 break;
132 if (substream == NULL)
133 return -ENXIO;
134 guard(mutex)(&pcm->open_mutex);
135 return snd_pcm_info_user(substream, info);
136 }
137 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
138 {
139 int val;
140
141 if (get_user(val, (int __user *)arg))
142 return -EFAULT;
143 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
144 return 0;
145 }
146 }
147 return -ENOIOCTLCMD;
148}
149
150#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
151
152static const char * const snd_pcm_format_names[] = {
153 FORMAT(S8),
154 FORMAT(U8),
155 FORMAT(S16_LE),
156 FORMAT(S16_BE),
157 FORMAT(U16_LE),
158 FORMAT(U16_BE),
159 FORMAT(S24_LE),
160 FORMAT(S24_BE),
161 FORMAT(U24_LE),
162 FORMAT(U24_BE),
163 FORMAT(S32_LE),
164 FORMAT(S32_BE),
165 FORMAT(U32_LE),
166 FORMAT(U32_BE),
167 FORMAT(FLOAT_LE),
168 FORMAT(FLOAT_BE),
169 FORMAT(FLOAT64_LE),
170 FORMAT(FLOAT64_BE),
171 FORMAT(IEC958_SUBFRAME_LE),
172 FORMAT(IEC958_SUBFRAME_BE),
173 FORMAT(MU_LAW),
174 FORMAT(A_LAW),
175 FORMAT(IMA_ADPCM),
176 FORMAT(MPEG),
177 FORMAT(GSM),
178 FORMAT(SPECIAL),
179 FORMAT(S24_3LE),
180 FORMAT(S24_3BE),
181 FORMAT(U24_3LE),
182 FORMAT(U24_3BE),
183 FORMAT(S20_3LE),
184 FORMAT(S20_3BE),
185 FORMAT(U20_3LE),
186 FORMAT(U20_3BE),
187 FORMAT(S18_3LE),
188 FORMAT(S18_3BE),
189 FORMAT(U18_3LE),
190 FORMAT(U18_3BE),
191 FORMAT(G723_24),
192 FORMAT(G723_24_1B),
193 FORMAT(G723_40),
194 FORMAT(G723_40_1B),
195 FORMAT(DSD_U8),
196 FORMAT(DSD_U16_LE),
197 FORMAT(DSD_U32_LE),
198 FORMAT(DSD_U16_BE),
199 FORMAT(DSD_U32_BE),
200 FORMAT(S20_LE),
201 FORMAT(S20_BE),
202 FORMAT(U20_LE),
203 FORMAT(U20_BE),
204};
205
206/**
207 * snd_pcm_format_name - Return a name string for the given PCM format
208 * @format: PCM format
209 *
210 * Return: the format name string
211 */
212const char *snd_pcm_format_name(snd_pcm_format_t format)
213{
214 unsigned int format_num = (__force unsigned int)format;
215
216 if (format_num >= ARRAY_SIZE(snd_pcm_format_names) || !snd_pcm_format_names[format_num])
217 return "Unknown";
218 return snd_pcm_format_names[format_num];
219}
220EXPORT_SYMBOL_GPL(snd_pcm_format_name);
221
222#ifdef CONFIG_SND_VERBOSE_PROCFS
223
224#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
225#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
226#define READY(v) [SNDRV_PCM_READY_##v] = #v
227#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
228#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
229#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
230#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
231#define START(v) [SNDRV_PCM_START_##v] = #v
232#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
233
234static const char * const snd_pcm_stream_names[] = {
235 STREAM(PLAYBACK),
236 STREAM(CAPTURE),
237};
238
239static const char * const snd_pcm_state_names[] = {
240 STATE(OPEN),
241 STATE(SETUP),
242 STATE(PREPARED),
243 STATE(RUNNING),
244 STATE(XRUN),
245 STATE(DRAINING),
246 STATE(PAUSED),
247 STATE(SUSPENDED),
248 STATE(DISCONNECTED),
249};
250
251static const char * const snd_pcm_access_names[] = {
252 ACCESS(MMAP_INTERLEAVED),
253 ACCESS(MMAP_NONINTERLEAVED),
254 ACCESS(MMAP_COMPLEX),
255 ACCESS(RW_INTERLEAVED),
256 ACCESS(RW_NONINTERLEAVED),
257};
258
259static const char * const snd_pcm_subformat_names[] = {
260 SUBFORMAT(STD),
261 SUBFORMAT(MSBITS_MAX),
262 SUBFORMAT(MSBITS_20),
263 SUBFORMAT(MSBITS_24),
264};
265
266static const char * const snd_pcm_tstamp_mode_names[] = {
267 TSTAMP(NONE),
268 TSTAMP(ENABLE),
269};
270
271static const char *snd_pcm_stream_name(int stream)
272{
273 return snd_pcm_stream_names[stream];
274}
275
276static const char *snd_pcm_access_name(snd_pcm_access_t access)
277{
278 return snd_pcm_access_names[(__force int)access];
279}
280
281static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
282{
283 return snd_pcm_subformat_names[(__force int)subformat];
284}
285
286static const char *snd_pcm_tstamp_mode_name(int mode)
287{
288 return snd_pcm_tstamp_mode_names[mode];
289}
290
291static const char *snd_pcm_state_name(snd_pcm_state_t state)
292{
293 return snd_pcm_state_names[(__force int)state];
294}
295
296#if IS_ENABLED(CONFIG_SND_PCM_OSS)
297#include <linux/soundcard.h>
298
299static const char *snd_pcm_oss_format_name(int format)
300{
301 switch (format) {
302 case AFMT_MU_LAW:
303 return "MU_LAW";
304 case AFMT_A_LAW:
305 return "A_LAW";
306 case AFMT_IMA_ADPCM:
307 return "IMA_ADPCM";
308 case AFMT_U8:
309 return "U8";
310 case AFMT_S16_LE:
311 return "S16_LE";
312 case AFMT_S16_BE:
313 return "S16_BE";
314 case AFMT_S8:
315 return "S8";
316 case AFMT_U16_LE:
317 return "U16_LE";
318 case AFMT_U16_BE:
319 return "U16_BE";
320 case AFMT_MPEG:
321 return "MPEG";
322 default:
323 return "unknown";
324 }
325}
326#endif
327
328static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
329 struct snd_info_buffer *buffer)
330{
331 struct snd_pcm_info *info __free(kfree) = NULL;
332 int err;
333
334 if (! substream)
335 return;
336
337 info = kmalloc(sizeof(*info), GFP_KERNEL);
338 if (!info)
339 return;
340
341 err = snd_pcm_info(substream, info);
342 if (err < 0) {
343 snd_iprintf(buffer, "error %d\n", err);
344 return;
345 }
346 snd_iprintf(buffer, "card: %d\n", info->card);
347 snd_iprintf(buffer, "device: %d\n", info->device);
348 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
349 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
350 snd_iprintf(buffer, "id: %s\n", info->id);
351 snd_iprintf(buffer, "name: %s\n", info->name);
352 snd_iprintf(buffer, "subname: %s\n", info->subname);
353 snd_iprintf(buffer, "class: %d\n", info->dev_class);
354 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
355 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
356 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
357}
358
359static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
360 struct snd_info_buffer *buffer)
361{
362 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
363 buffer);
364}
365
366static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
367 struct snd_info_buffer *buffer)
368{
369 snd_pcm_proc_info_read(entry->private_data, buffer);
370}
371
372static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
373 struct snd_info_buffer *buffer)
374{
375 struct snd_pcm_substream *substream = entry->private_data;
376 struct snd_pcm_runtime *runtime;
377
378 guard(mutex)(&substream->pcm->open_mutex);
379 runtime = substream->runtime;
380 if (!runtime) {
381 snd_iprintf(buffer, "closed\n");
382 return;
383 }
384 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
385 snd_iprintf(buffer, "no setup\n");
386 return;
387 }
388 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
389 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
390 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
391 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
392 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
393 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
394 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
395#if IS_ENABLED(CONFIG_SND_PCM_OSS)
396 if (substream->oss.oss) {
397 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
398 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
399 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
400 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
401 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
402 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
403 }
404#endif
405}
406
407static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
408 struct snd_info_buffer *buffer)
409{
410 struct snd_pcm_substream *substream = entry->private_data;
411 struct snd_pcm_runtime *runtime;
412
413 guard(mutex)(&substream->pcm->open_mutex);
414 runtime = substream->runtime;
415 if (!runtime) {
416 snd_iprintf(buffer, "closed\n");
417 return;
418 }
419 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
420 snd_iprintf(buffer, "no setup\n");
421 return;
422 }
423 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
424 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
425 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
426 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
427 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
428 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
429 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
430 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
431}
432
433static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
434 struct snd_info_buffer *buffer)
435{
436 struct snd_pcm_substream *substream = entry->private_data;
437 struct snd_pcm_runtime *runtime;
438 struct snd_pcm_status64 status;
439 int err;
440
441 guard(mutex)(&substream->pcm->open_mutex);
442 runtime = substream->runtime;
443 if (!runtime) {
444 snd_iprintf(buffer, "closed\n");
445 return;
446 }
447 memset(&status, 0, sizeof(status));
448 err = snd_pcm_status64(substream, &status);
449 if (err < 0) {
450 snd_iprintf(buffer, "error %d\n", err);
451 return;
452 }
453 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
454 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
455 snd_iprintf(buffer, "trigger_time: %lld.%09lld\n",
456 status.trigger_tstamp_sec, status.trigger_tstamp_nsec);
457 snd_iprintf(buffer, "tstamp : %lld.%09lld\n",
458 status.tstamp_sec, status.tstamp_nsec);
459 snd_iprintf(buffer, "delay : %ld\n", status.delay);
460 snd_iprintf(buffer, "avail : %ld\n", status.avail);
461 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
462 snd_iprintf(buffer, "-----\n");
463 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
464 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
465#ifdef CONFIG_SND_PCM_XRUN_DEBUG
466 snd_iprintf(buffer, "xrun_counter: %d\n", substream->xrun_counter);
467#endif
468}
469
470#ifdef CONFIG_SND_PCM_XRUN_DEBUG
471static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
472 struct snd_info_buffer *buffer)
473{
474 struct snd_pcm_substream *substream = entry->private_data;
475
476 snd_pcm_stop_xrun(substream);
477}
478
479static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
480 struct snd_info_buffer *buffer)
481{
482 struct snd_pcm_str *pstr = entry->private_data;
483 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
484}
485
486static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
487 struct snd_info_buffer *buffer)
488{
489 struct snd_pcm_str *pstr = entry->private_data;
490 char line[64];
491 if (!snd_info_get_line(buffer, line, sizeof(line)))
492 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
493}
494#endif
495
496static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
497{
498 struct snd_pcm *pcm = pstr->pcm;
499 struct snd_info_entry *entry;
500 char name[16];
501
502 sprintf(name, "pcm%i%c", pcm->device,
503 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
504 entry = snd_info_create_card_entry(pcm->card, name,
505 pcm->card->proc_root);
506 if (!entry)
507 return -ENOMEM;
508 entry->mode = S_IFDIR | 0555;
509 pstr->proc_root = entry;
510 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
511 if (entry)
512 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
513#ifdef CONFIG_SND_PCM_XRUN_DEBUG
514 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
515 pstr->proc_root);
516 if (entry) {
517 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
518 entry->c.text.write = snd_pcm_xrun_debug_write;
519 entry->mode |= 0200;
520 }
521#endif
522 return 0;
523}
524
525static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
526{
527 snd_info_free_entry(pstr->proc_root);
528 pstr->proc_root = NULL;
529 return 0;
530}
531
532static struct snd_info_entry *
533create_substream_info_entry(struct snd_pcm_substream *substream,
534 const char *name,
535 void (*read)(struct snd_info_entry *,
536 struct snd_info_buffer *))
537{
538 struct snd_info_entry *entry;
539
540 entry = snd_info_create_card_entry(substream->pcm->card, name,
541 substream->proc_root);
542 if (entry)
543 snd_info_set_text_ops(entry, substream, read);
544 return entry;
545}
546
547static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
548{
549 struct snd_info_entry *entry;
550 struct snd_card *card;
551 char name[16];
552
553 card = substream->pcm->card;
554
555 sprintf(name, "sub%i", substream->number);
556 entry = snd_info_create_card_entry(card, name,
557 substream->pstr->proc_root);
558 if (!entry)
559 return -ENOMEM;
560 entry->mode = S_IFDIR | 0555;
561 substream->proc_root = entry;
562
563 create_substream_info_entry(substream, "info",
564 snd_pcm_substream_proc_info_read);
565 create_substream_info_entry(substream, "hw_params",
566 snd_pcm_substream_proc_hw_params_read);
567 create_substream_info_entry(substream, "sw_params",
568 snd_pcm_substream_proc_sw_params_read);
569 create_substream_info_entry(substream, "status",
570 snd_pcm_substream_proc_status_read);
571
572#ifdef CONFIG_SND_PCM_XRUN_DEBUG
573 entry = create_substream_info_entry(substream, "xrun_injection", NULL);
574 if (entry) {
575 entry->c.text.write = snd_pcm_xrun_injection_write;
576 entry->mode = S_IFREG | 0200;
577 }
578#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
579
580 return 0;
581}
582
583#else /* !CONFIG_SND_VERBOSE_PROCFS */
584static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
585static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
586static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
587#endif /* CONFIG_SND_VERBOSE_PROCFS */
588
589static const struct attribute_group *pcm_dev_attr_groups[];
590
591/*
592 * PM callbacks: we need to deal only with suspend here, as the resume is
593 * triggered either from user-space or the driver's resume callback
594 */
595#ifdef CONFIG_PM_SLEEP
596static int do_pcm_suspend(struct device *dev)
597{
598 struct snd_pcm_str *pstr = dev_get_drvdata(dev);
599
600 if (!pstr->pcm->no_device_suspend)
601 snd_pcm_suspend_all(pstr->pcm);
602 return 0;
603}
604#endif
605
606static const struct dev_pm_ops pcm_dev_pm_ops = {
607 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
608};
609
610/* device type for PCM -- basically only for passing PM callbacks */
611static const struct device_type pcm_dev_type = {
612 .name = "pcm",
613 .pm = &pcm_dev_pm_ops,
614};
615
616/**
617 * snd_pcm_new_stream - create a new PCM stream
618 * @pcm: the pcm instance
619 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
620 * @substream_count: the number of substreams
621 *
622 * Creates a new stream for the pcm.
623 * The corresponding stream on the pcm must have been empty before
624 * calling this, i.e. zero must be given to the argument of
625 * snd_pcm_new().
626 *
627 * Return: Zero if successful, or a negative error code on failure.
628 */
629int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
630{
631 int idx, err;
632 struct snd_pcm_str *pstr = &pcm->streams[stream];
633 struct snd_pcm_substream *substream, *prev;
634
635#if IS_ENABLED(CONFIG_SND_PCM_OSS)
636 mutex_init(&pstr->oss.setup_mutex);
637#endif
638 pstr->stream = stream;
639 pstr->pcm = pcm;
640 pstr->substream_count = substream_count;
641 if (!substream_count)
642 return 0;
643
644 err = snd_device_alloc(&pstr->dev, pcm->card);
645 if (err < 0)
646 return err;
647 dev_set_name(pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
648 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
649 pstr->dev->groups = pcm_dev_attr_groups;
650 pstr->dev->type = &pcm_dev_type;
651 dev_set_drvdata(pstr->dev, pstr);
652
653 if (!pcm->internal) {
654 err = snd_pcm_stream_proc_init(pstr);
655 if (err < 0) {
656 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
657 return err;
658 }
659 }
660 prev = NULL;
661 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
662 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
663 if (!substream)
664 return -ENOMEM;
665 substream->pcm = pcm;
666 substream->pstr = pstr;
667 substream->number = idx;
668 substream->stream = stream;
669 sprintf(substream->name, "subdevice #%i", idx);
670 substream->buffer_bytes_max = UINT_MAX;
671 if (prev == NULL)
672 pstr->substream = substream;
673 else
674 prev->next = substream;
675
676 if (!pcm->internal) {
677 err = snd_pcm_substream_proc_init(substream);
678 if (err < 0) {
679 pcm_err(pcm,
680 "Error in snd_pcm_stream_proc_init\n");
681 if (prev == NULL)
682 pstr->substream = NULL;
683 else
684 prev->next = NULL;
685 kfree(substream);
686 return err;
687 }
688 }
689 substream->group = &substream->self_group;
690 snd_pcm_group_init(&substream->self_group);
691 list_add_tail(&substream->link_list, &substream->self_group.substreams);
692 atomic_set(&substream->mmap_count, 0);
693 prev = substream;
694 }
695 return 0;
696}
697EXPORT_SYMBOL(snd_pcm_new_stream);
698
699static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
700 int playback_count, int capture_count, bool internal,
701 struct snd_pcm **rpcm)
702{
703 struct snd_pcm *pcm;
704 int err;
705 static const struct snd_device_ops ops = {
706 .dev_free = snd_pcm_dev_free,
707 .dev_register = snd_pcm_dev_register,
708 .dev_disconnect = snd_pcm_dev_disconnect,
709 };
710 static const struct snd_device_ops internal_ops = {
711 .dev_free = snd_pcm_dev_free,
712 };
713
714 if (snd_BUG_ON(!card))
715 return -ENXIO;
716 if (rpcm)
717 *rpcm = NULL;
718 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
719 if (!pcm)
720 return -ENOMEM;
721 pcm->card = card;
722 pcm->device = device;
723 pcm->internal = internal;
724 mutex_init(&pcm->open_mutex);
725 init_waitqueue_head(&pcm->open_wait);
726 INIT_LIST_HEAD(&pcm->list);
727 if (id)
728 strscpy(pcm->id, id, sizeof(pcm->id));
729
730 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
731 playback_count);
732 if (err < 0)
733 goto free_pcm;
734
735 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
736 if (err < 0)
737 goto free_pcm;
738
739 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
740 internal ? &internal_ops : &ops);
741 if (err < 0)
742 goto free_pcm;
743
744 if (rpcm)
745 *rpcm = pcm;
746 return 0;
747
748free_pcm:
749 snd_pcm_free(pcm);
750 return err;
751}
752
753/**
754 * snd_pcm_new - create a new PCM instance
755 * @card: the card instance
756 * @id: the id string
757 * @device: the device index (zero based)
758 * @playback_count: the number of substreams for playback
759 * @capture_count: the number of substreams for capture
760 * @rpcm: the pointer to store the new pcm instance
761 *
762 * Creates a new PCM instance.
763 *
764 * The pcm operators have to be set afterwards to the new instance
765 * via snd_pcm_set_ops().
766 *
767 * Return: Zero if successful, or a negative error code on failure.
768 */
769int snd_pcm_new(struct snd_card *card, const char *id, int device,
770 int playback_count, int capture_count, struct snd_pcm **rpcm)
771{
772 return _snd_pcm_new(card, id, device, playback_count, capture_count,
773 false, rpcm);
774}
775EXPORT_SYMBOL(snd_pcm_new);
776
777/**
778 * snd_pcm_new_internal - create a new internal PCM instance
779 * @card: the card instance
780 * @id: the id string
781 * @device: the device index (zero based - shared with normal PCMs)
782 * @playback_count: the number of substreams for playback
783 * @capture_count: the number of substreams for capture
784 * @rpcm: the pointer to store the new pcm instance
785 *
786 * Creates a new internal PCM instance with no userspace device or procfs
787 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
788 * will only be used internally by kernel drivers. i.e. it cannot be opened
789 * by userspace. It provides existing ASoC components drivers with a substream
790 * and access to any private data.
791 *
792 * The pcm operators have to be set afterwards to the new instance
793 * via snd_pcm_set_ops().
794 *
795 * Return: Zero if successful, or a negative error code on failure.
796 */
797int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
798 int playback_count, int capture_count,
799 struct snd_pcm **rpcm)
800{
801 return _snd_pcm_new(card, id, device, playback_count, capture_count,
802 true, rpcm);
803}
804EXPORT_SYMBOL(snd_pcm_new_internal);
805
806static void free_chmap(struct snd_pcm_str *pstr)
807{
808 if (pstr->chmap_kctl) {
809 struct snd_card *card = pstr->pcm->card;
810
811 snd_ctl_remove(card, pstr->chmap_kctl);
812 pstr->chmap_kctl = NULL;
813 }
814}
815
816static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
817{
818 struct snd_pcm_substream *substream, *substream_next;
819#if IS_ENABLED(CONFIG_SND_PCM_OSS)
820 struct snd_pcm_oss_setup *setup, *setupn;
821#endif
822
823 /* free all proc files under the stream */
824 snd_pcm_stream_proc_done(pstr);
825
826 substream = pstr->substream;
827 while (substream) {
828 substream_next = substream->next;
829 snd_pcm_timer_done(substream);
830 kfree(substream);
831 substream = substream_next;
832 }
833#if IS_ENABLED(CONFIG_SND_PCM_OSS)
834 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
835 setupn = setup->next;
836 kfree(setup->task_name);
837 kfree(setup);
838 }
839#endif
840 free_chmap(pstr);
841 if (pstr->substream_count)
842 put_device(pstr->dev);
843}
844
845#if IS_ENABLED(CONFIG_SND_PCM_OSS)
846#define pcm_call_notify(pcm, call) \
847 do { \
848 struct snd_pcm_notify *_notify; \
849 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
850 _notify->call(pcm); \
851 } while (0)
852#else
853#define pcm_call_notify(pcm, call) do {} while (0)
854#endif
855
856static int snd_pcm_free(struct snd_pcm *pcm)
857{
858 if (!pcm)
859 return 0;
860 if (!pcm->internal)
861 pcm_call_notify(pcm, n_unregister);
862 if (pcm->private_free)
863 pcm->private_free(pcm);
864 snd_pcm_lib_preallocate_free_for_all(pcm);
865 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
866 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
867 kfree(pcm);
868 return 0;
869}
870
871static int snd_pcm_dev_free(struct snd_device *device)
872{
873 struct snd_pcm *pcm = device->device_data;
874 return snd_pcm_free(pcm);
875}
876
877int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
878 struct file *file,
879 struct snd_pcm_substream **rsubstream)
880{
881 struct snd_pcm_str * pstr;
882 struct snd_pcm_substream *substream;
883 struct snd_pcm_runtime *runtime;
884 struct snd_card *card;
885 int prefer_subdevice;
886 size_t size;
887
888 if (snd_BUG_ON(!pcm || !rsubstream))
889 return -ENXIO;
890 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
891 stream != SNDRV_PCM_STREAM_CAPTURE))
892 return -EINVAL;
893 *rsubstream = NULL;
894 pstr = &pcm->streams[stream];
895 if (pstr->substream == NULL || pstr->substream_count == 0)
896 return -ENODEV;
897
898 card = pcm->card;
899 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
900
901 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
902 int opposite = !stream;
903
904 for (substream = pcm->streams[opposite].substream; substream;
905 substream = substream->next) {
906 if (SUBSTREAM_BUSY(substream))
907 return -EAGAIN;
908 }
909 }
910
911 if (file->f_flags & O_APPEND) {
912 if (prefer_subdevice < 0) {
913 if (pstr->substream_count > 1)
914 return -EINVAL; /* must be unique */
915 substream = pstr->substream;
916 } else {
917 for (substream = pstr->substream; substream;
918 substream = substream->next)
919 if (substream->number == prefer_subdevice)
920 break;
921 }
922 if (! substream)
923 return -ENODEV;
924 if (! SUBSTREAM_BUSY(substream))
925 return -EBADFD;
926 substream->ref_count++;
927 *rsubstream = substream;
928 return 0;
929 }
930
931 for (substream = pstr->substream; substream; substream = substream->next) {
932 if (!SUBSTREAM_BUSY(substream) &&
933 (prefer_subdevice == -1 ||
934 substream->number == prefer_subdevice))
935 break;
936 }
937 if (substream == NULL)
938 return -EAGAIN;
939
940 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
941 if (runtime == NULL)
942 return -ENOMEM;
943
944 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
945 runtime->status = alloc_pages_exact(size, GFP_KERNEL);
946 if (runtime->status == NULL) {
947 kfree(runtime);
948 return -ENOMEM;
949 }
950 memset(runtime->status, 0, size);
951
952 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
953 runtime->control = alloc_pages_exact(size, GFP_KERNEL);
954 if (runtime->control == NULL) {
955 free_pages_exact(runtime->status,
956 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
957 kfree(runtime);
958 return -ENOMEM;
959 }
960 memset(runtime->control, 0, size);
961
962 init_waitqueue_head(&runtime->sleep);
963 init_waitqueue_head(&runtime->tsleep);
964
965 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_OPEN);
966 mutex_init(&runtime->buffer_mutex);
967 atomic_set(&runtime->buffer_accessing, 0);
968
969 substream->runtime = runtime;
970 substream->private_data = pcm->private_data;
971 substream->ref_count = 1;
972 substream->f_flags = file->f_flags;
973 substream->pid = get_pid(task_pid(current));
974 pstr->substream_opened++;
975 *rsubstream = substream;
976#ifdef CONFIG_SND_PCM_XRUN_DEBUG
977 substream->xrun_counter = 0;
978#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
979 return 0;
980}
981
982void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
983{
984 struct snd_pcm_runtime *runtime;
985
986 if (PCM_RUNTIME_CHECK(substream))
987 return;
988 runtime = substream->runtime;
989 if (runtime->private_free != NULL)
990 runtime->private_free(runtime);
991 free_pages_exact(runtime->status,
992 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
993 free_pages_exact(runtime->control,
994 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
995 kfree(runtime->hw_constraints.rules);
996 /* Avoid concurrent access to runtime via PCM timer interface */
997 if (substream->timer) {
998 scoped_guard(spinlock_irq, &substream->timer->lock)
999 substream->runtime = NULL;
1000 } else {
1001 substream->runtime = NULL;
1002 }
1003 mutex_destroy(&runtime->buffer_mutex);
1004 snd_fasync_free(runtime->fasync);
1005 kfree(runtime);
1006 put_pid(substream->pid);
1007 substream->pid = NULL;
1008 substream->pstr->substream_opened--;
1009}
1010
1011static ssize_t pcm_class_show(struct device *dev,
1012 struct device_attribute *attr, char *buf)
1013{
1014 struct snd_pcm_str *pstr = dev_get_drvdata(dev);
1015 struct snd_pcm *pcm = pstr->pcm;
1016 const char *str;
1017 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1018 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1019 [SNDRV_PCM_CLASS_MULTI] = "multi",
1020 [SNDRV_PCM_CLASS_MODEM] = "modem",
1021 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1022 };
1023
1024 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1025 str = "none";
1026 else
1027 str = strs[pcm->dev_class];
1028 return sysfs_emit(buf, "%s\n", str);
1029}
1030
1031static DEVICE_ATTR_RO(pcm_class);
1032static struct attribute *pcm_dev_attrs[] = {
1033 &dev_attr_pcm_class.attr,
1034 NULL
1035};
1036
1037static const struct attribute_group pcm_dev_attr_group = {
1038 .attrs = pcm_dev_attrs,
1039};
1040
1041static const struct attribute_group *pcm_dev_attr_groups[] = {
1042 &pcm_dev_attr_group,
1043 NULL
1044};
1045
1046static int snd_pcm_dev_register(struct snd_device *device)
1047{
1048 int cidx, err;
1049 struct snd_pcm_substream *substream;
1050 struct snd_pcm *pcm;
1051
1052 if (snd_BUG_ON(!device || !device->device_data))
1053 return -ENXIO;
1054 pcm = device->device_data;
1055
1056 guard(mutex)(®ister_mutex);
1057 err = snd_pcm_add(pcm);
1058 if (err)
1059 return err;
1060 for (cidx = 0; cidx < 2; cidx++) {
1061 int devtype = -1;
1062 if (pcm->streams[cidx].substream == NULL)
1063 continue;
1064 switch (cidx) {
1065 case SNDRV_PCM_STREAM_PLAYBACK:
1066 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1067 break;
1068 case SNDRV_PCM_STREAM_CAPTURE:
1069 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1070 break;
1071 }
1072 /* register pcm */
1073 err = snd_register_device(devtype, pcm->card, pcm->device,
1074 &snd_pcm_f_ops[cidx], pcm,
1075 pcm->streams[cidx].dev);
1076 if (err < 0) {
1077 list_del_init(&pcm->list);
1078 return err;
1079 }
1080
1081 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1082 snd_pcm_timer_init(substream);
1083 }
1084
1085 pcm_call_notify(pcm, n_register);
1086 return err;
1087}
1088
1089static int snd_pcm_dev_disconnect(struct snd_device *device)
1090{
1091 struct snd_pcm *pcm = device->device_data;
1092 struct snd_pcm_substream *substream;
1093 int cidx;
1094
1095 guard(mutex)(®ister_mutex);
1096 guard(mutex)(&pcm->open_mutex);
1097 wake_up(&pcm->open_wait);
1098 list_del_init(&pcm->list);
1099
1100 for_each_pcm_substream(pcm, cidx, substream) {
1101 snd_pcm_stream_lock_irq(substream);
1102 if (substream->runtime) {
1103 if (snd_pcm_running(substream))
1104 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
1105 /* to be sure, set the state unconditionally */
1106 __snd_pcm_set_state(substream->runtime,
1107 SNDRV_PCM_STATE_DISCONNECTED);
1108 wake_up(&substream->runtime->sleep);
1109 wake_up(&substream->runtime->tsleep);
1110 }
1111 snd_pcm_stream_unlock_irq(substream);
1112 }
1113
1114 for_each_pcm_substream(pcm, cidx, substream)
1115 snd_pcm_sync_stop(substream, false);
1116
1117 pcm_call_notify(pcm, n_disconnect);
1118 for (cidx = 0; cidx < 2; cidx++) {
1119 if (pcm->streams[cidx].dev)
1120 snd_unregister_device(pcm->streams[cidx].dev);
1121 free_chmap(&pcm->streams[cidx]);
1122 }
1123 return 0;
1124}
1125
1126#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1127/**
1128 * snd_pcm_notify - Add/remove the notify list
1129 * @notify: PCM notify list
1130 * @nfree: 0 = register, 1 = unregister
1131 *
1132 * This adds the given notifier to the global list so that the callback is
1133 * called for each registered PCM devices. This exists only for PCM OSS
1134 * emulation, so far.
1135 *
1136 * Return: zero if successful, or a negative error code
1137 */
1138int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1139{
1140 struct snd_pcm *pcm;
1141
1142 if (snd_BUG_ON(!notify ||
1143 !notify->n_register ||
1144 !notify->n_unregister ||
1145 !notify->n_disconnect))
1146 return -EINVAL;
1147 guard(mutex)(®ister_mutex);
1148 if (nfree) {
1149 list_del(¬ify->list);
1150 list_for_each_entry(pcm, &snd_pcm_devices, list)
1151 notify->n_unregister(pcm);
1152 } else {
1153 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1154 list_for_each_entry(pcm, &snd_pcm_devices, list)
1155 notify->n_register(pcm);
1156 }
1157 return 0;
1158}
1159EXPORT_SYMBOL(snd_pcm_notify);
1160#endif /* CONFIG_SND_PCM_OSS */
1161
1162#ifdef CONFIG_SND_PROC_FS
1163/*
1164 * Info interface
1165 */
1166
1167static void snd_pcm_proc_read(struct snd_info_entry *entry,
1168 struct snd_info_buffer *buffer)
1169{
1170 struct snd_pcm *pcm;
1171
1172 guard(mutex)(®ister_mutex);
1173 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1174 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1175 pcm->card->number, pcm->device, pcm->id, pcm->name);
1176 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1177 snd_iprintf(buffer, " : playback %i",
1178 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1179 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1180 snd_iprintf(buffer, " : capture %i",
1181 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1182 snd_iprintf(buffer, "\n");
1183 }
1184}
1185
1186static struct snd_info_entry *snd_pcm_proc_entry;
1187
1188static void snd_pcm_proc_init(void)
1189{
1190 struct snd_info_entry *entry;
1191
1192 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1193 if (entry) {
1194 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1195 if (snd_info_register(entry) < 0) {
1196 snd_info_free_entry(entry);
1197 entry = NULL;
1198 }
1199 }
1200 snd_pcm_proc_entry = entry;
1201}
1202
1203static void snd_pcm_proc_done(void)
1204{
1205 snd_info_free_entry(snd_pcm_proc_entry);
1206}
1207
1208#else /* !CONFIG_SND_PROC_FS */
1209#define snd_pcm_proc_init()
1210#define snd_pcm_proc_done()
1211#endif /* CONFIG_SND_PROC_FS */
1212
1213
1214/*
1215 * ENTRY functions
1216 */
1217
1218static int __init alsa_pcm_init(void)
1219{
1220 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1221 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1222 snd_pcm_proc_init();
1223 return 0;
1224}
1225
1226static void __exit alsa_pcm_exit(void)
1227{
1228 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1229 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1230 snd_pcm_proc_done();
1231}
1232
1233module_init(alsa_pcm_init)
1234module_exit(alsa_pcm_exit)
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
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 list_for_each_entry(pcm, &snd_pcm_devices, list) {
76 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
77 return -EBUSY;
78 if (pcm->card->number > newpcm->card->number ||
79 (pcm->card == newpcm->card &&
80 pcm->device > newpcm->device)) {
81 list_add(&newpcm->list, pcm->list.prev);
82 return 0;
83 }
84 }
85 list_add_tail(&newpcm->list, &snd_pcm_devices);
86 return 0;
87}
88
89static int snd_pcm_control_ioctl(struct snd_card *card,
90 struct snd_ctl_file *control,
91 unsigned int cmd, unsigned long arg)
92{
93 switch (cmd) {
94 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
95 {
96 int device;
97
98 if (get_user(device, (int __user *)arg))
99 return -EFAULT;
100 mutex_lock(®ister_mutex);
101 device = snd_pcm_next(card, device);
102 mutex_unlock(®ister_mutex);
103 if (put_user(device, (int __user *)arg))
104 return -EFAULT;
105 return 0;
106 }
107 case SNDRV_CTL_IOCTL_PCM_INFO:
108 {
109 struct snd_pcm_info __user *info;
110 unsigned int device, subdevice;
111 int stream;
112 struct snd_pcm *pcm;
113 struct snd_pcm_str *pstr;
114 struct snd_pcm_substream *substream;
115 int err;
116
117 info = (struct snd_pcm_info __user *)arg;
118 if (get_user(device, &info->device))
119 return -EFAULT;
120 if (get_user(stream, &info->stream))
121 return -EFAULT;
122 if (stream < 0 || stream > 1)
123 return -EINVAL;
124 if (get_user(subdevice, &info->subdevice))
125 return -EFAULT;
126 mutex_lock(®ister_mutex);
127 pcm = snd_pcm_get(card, device);
128 if (pcm == NULL) {
129 err = -ENXIO;
130 goto _error;
131 }
132 pstr = &pcm->streams[stream];
133 if (pstr->substream_count == 0) {
134 err = -ENOENT;
135 goto _error;
136 }
137 if (subdevice >= pstr->substream_count) {
138 err = -ENXIO;
139 goto _error;
140 }
141 for (substream = pstr->substream; substream;
142 substream = substream->next)
143 if (substream->number == (int)subdevice)
144 break;
145 if (substream == NULL) {
146 err = -ENXIO;
147 goto _error;
148 }
149 err = snd_pcm_info_user(substream, info);
150 _error:
151 mutex_unlock(®ister_mutex);
152 return err;
153 }
154 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
155 {
156 int val;
157
158 if (get_user(val, (int __user *)arg))
159 return -EFAULT;
160 control->prefer_pcm_subdevice = val;
161 return 0;
162 }
163 }
164 return -ENOIOCTLCMD;
165}
166
167#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
168
169static char *snd_pcm_format_names[] = {
170 FORMAT(S8),
171 FORMAT(U8),
172 FORMAT(S16_LE),
173 FORMAT(S16_BE),
174 FORMAT(U16_LE),
175 FORMAT(U16_BE),
176 FORMAT(S24_LE),
177 FORMAT(S24_BE),
178 FORMAT(U24_LE),
179 FORMAT(U24_BE),
180 FORMAT(S32_LE),
181 FORMAT(S32_BE),
182 FORMAT(U32_LE),
183 FORMAT(U32_BE),
184 FORMAT(FLOAT_LE),
185 FORMAT(FLOAT_BE),
186 FORMAT(FLOAT64_LE),
187 FORMAT(FLOAT64_BE),
188 FORMAT(IEC958_SUBFRAME_LE),
189 FORMAT(IEC958_SUBFRAME_BE),
190 FORMAT(MU_LAW),
191 FORMAT(A_LAW),
192 FORMAT(IMA_ADPCM),
193 FORMAT(MPEG),
194 FORMAT(GSM),
195 FORMAT(SPECIAL),
196 FORMAT(S24_3LE),
197 FORMAT(S24_3BE),
198 FORMAT(U24_3LE),
199 FORMAT(U24_3BE),
200 FORMAT(S20_3LE),
201 FORMAT(S20_3BE),
202 FORMAT(U20_3LE),
203 FORMAT(U20_3BE),
204 FORMAT(S18_3LE),
205 FORMAT(S18_3BE),
206 FORMAT(U18_3LE),
207 FORMAT(U18_3BE),
208 FORMAT(G723_24),
209 FORMAT(G723_24_1B),
210 FORMAT(G723_40),
211 FORMAT(G723_40_1B),
212};
213
214const char *snd_pcm_format_name(snd_pcm_format_t format)
215{
216 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
217 return "Unknown";
218 return snd_pcm_format_names[(__force unsigned int)format];
219}
220EXPORT_SYMBOL_GPL(snd_pcm_format_name);
221
222#ifdef CONFIG_SND_VERBOSE_PROCFS
223
224#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
225#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
226#define READY(v) [SNDRV_PCM_READY_##v] = #v
227#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
228#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
229#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
230#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
231#define START(v) [SNDRV_PCM_START_##v] = #v
232#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
233
234static char *snd_pcm_stream_names[] = {
235 STREAM(PLAYBACK),
236 STREAM(CAPTURE),
237};
238
239static char *snd_pcm_state_names[] = {
240 STATE(OPEN),
241 STATE(SETUP),
242 STATE(PREPARED),
243 STATE(RUNNING),
244 STATE(XRUN),
245 STATE(DRAINING),
246 STATE(PAUSED),
247 STATE(SUSPENDED),
248};
249
250static char *snd_pcm_access_names[] = {
251 ACCESS(MMAP_INTERLEAVED),
252 ACCESS(MMAP_NONINTERLEAVED),
253 ACCESS(MMAP_COMPLEX),
254 ACCESS(RW_INTERLEAVED),
255 ACCESS(RW_NONINTERLEAVED),
256};
257
258static char *snd_pcm_subformat_names[] = {
259 SUBFORMAT(STD),
260};
261
262static char *snd_pcm_tstamp_mode_names[] = {
263 TSTAMP(NONE),
264 TSTAMP(ENABLE),
265};
266
267static const char *snd_pcm_stream_name(int stream)
268{
269 return snd_pcm_stream_names[stream];
270}
271
272static const char *snd_pcm_access_name(snd_pcm_access_t access)
273{
274 return snd_pcm_access_names[(__force int)access];
275}
276
277static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
278{
279 return snd_pcm_subformat_names[(__force int)subformat];
280}
281
282static const char *snd_pcm_tstamp_mode_name(int mode)
283{
284 return snd_pcm_tstamp_mode_names[mode];
285}
286
287static const char *snd_pcm_state_name(snd_pcm_state_t state)
288{
289 return snd_pcm_state_names[(__force int)state];
290}
291
292#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
293#include <linux/soundcard.h>
294
295static const char *snd_pcm_oss_format_name(int format)
296{
297 switch (format) {
298 case AFMT_MU_LAW:
299 return "MU_LAW";
300 case AFMT_A_LAW:
301 return "A_LAW";
302 case AFMT_IMA_ADPCM:
303 return "IMA_ADPCM";
304 case AFMT_U8:
305 return "U8";
306 case AFMT_S16_LE:
307 return "S16_LE";
308 case AFMT_S16_BE:
309 return "S16_BE";
310 case AFMT_S8:
311 return "S8";
312 case AFMT_U16_LE:
313 return "U16_LE";
314 case AFMT_U16_BE:
315 return "U16_BE";
316 case AFMT_MPEG:
317 return "MPEG";
318 default:
319 return "unknown";
320 }
321}
322#endif
323
324static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
325 struct snd_info_buffer *buffer)
326{
327 struct snd_pcm_info *info;
328 int err;
329
330 if (! substream)
331 return;
332
333 info = kmalloc(sizeof(*info), GFP_KERNEL);
334 if (! info) {
335 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
336 return;
337 }
338
339 err = snd_pcm_info(substream, info);
340 if (err < 0) {
341 snd_iprintf(buffer, "error %d\n", err);
342 kfree(info);
343 return;
344 }
345 snd_iprintf(buffer, "card: %d\n", info->card);
346 snd_iprintf(buffer, "device: %d\n", info->device);
347 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
348 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
349 snd_iprintf(buffer, "id: %s\n", info->id);
350 snd_iprintf(buffer, "name: %s\n", info->name);
351 snd_iprintf(buffer, "subname: %s\n", info->subname);
352 snd_iprintf(buffer, "class: %d\n", info->dev_class);
353 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
354 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
355 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
356 kfree(info);
357}
358
359static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
360 struct snd_info_buffer *buffer)
361{
362 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
363 buffer);
364}
365
366static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
367 struct snd_info_buffer *buffer)
368{
369 snd_pcm_proc_info_read(entry->private_data, buffer);
370}
371
372static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
373 struct snd_info_buffer *buffer)
374{
375 struct snd_pcm_substream *substream = entry->private_data;
376 struct snd_pcm_runtime *runtime;
377
378 mutex_lock(&substream->pcm->open_mutex);
379 runtime = substream->runtime;
380 if (!runtime) {
381 snd_iprintf(buffer, "closed\n");
382 goto unlock;
383 }
384 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
385 snd_iprintf(buffer, "no setup\n");
386 goto unlock;
387 }
388 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
389 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
390 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
391 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
392 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
393 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
394 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
395#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
396 if (substream->oss.oss) {
397 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
398 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
399 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
400 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
401 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
402 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
403 }
404#endif
405 unlock:
406 mutex_unlock(&substream->pcm->open_mutex);
407}
408
409static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
410 struct snd_info_buffer *buffer)
411{
412 struct snd_pcm_substream *substream = entry->private_data;
413 struct snd_pcm_runtime *runtime;
414
415 mutex_lock(&substream->pcm->open_mutex);
416 runtime = substream->runtime;
417 if (!runtime) {
418 snd_iprintf(buffer, "closed\n");
419 goto unlock;
420 }
421 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
422 snd_iprintf(buffer, "no setup\n");
423 goto unlock;
424 }
425 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
426 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
427 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
428 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
429 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
430 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
431 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
432 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
433 unlock:
434 mutex_unlock(&substream->pcm->open_mutex);
435}
436
437static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
438 struct snd_info_buffer *buffer)
439{
440 struct snd_pcm_substream *substream = entry->private_data;
441 struct snd_pcm_runtime *runtime;
442 struct snd_pcm_status status;
443 int err;
444
445 mutex_lock(&substream->pcm->open_mutex);
446 runtime = substream->runtime;
447 if (!runtime) {
448 snd_iprintf(buffer, "closed\n");
449 goto unlock;
450 }
451 memset(&status, 0, sizeof(status));
452 err = snd_pcm_status(substream, &status);
453 if (err < 0) {
454 snd_iprintf(buffer, "error %d\n", err);
455 goto unlock;
456 }
457 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
458 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
459 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
460 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
461 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
462 status.tstamp.tv_sec, status.tstamp.tv_nsec);
463 snd_iprintf(buffer, "delay : %ld\n", status.delay);
464 snd_iprintf(buffer, "avail : %ld\n", status.avail);
465 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
466 snd_iprintf(buffer, "-----\n");
467 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
468 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
469 unlock:
470 mutex_unlock(&substream->pcm->open_mutex);
471}
472
473#ifdef CONFIG_SND_PCM_XRUN_DEBUG
474static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
475 struct snd_info_buffer *buffer)
476{
477 struct snd_pcm_str *pstr = entry->private_data;
478 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
479}
480
481static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
482 struct snd_info_buffer *buffer)
483{
484 struct snd_pcm_str *pstr = entry->private_data;
485 char line[64];
486 if (!snd_info_get_line(buffer, line, sizeof(line)))
487 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
488}
489#endif
490
491static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
492{
493 struct snd_pcm *pcm = pstr->pcm;
494 struct snd_info_entry *entry;
495 char name[16];
496
497 sprintf(name, "pcm%i%c", pcm->device,
498 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
499 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
500 return -ENOMEM;
501 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
502 if (snd_info_register(entry) < 0) {
503 snd_info_free_entry(entry);
504 return -ENOMEM;
505 }
506 pstr->proc_root = entry;
507
508 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
509 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
510 if (snd_info_register(entry) < 0) {
511 snd_info_free_entry(entry);
512 entry = NULL;
513 }
514 }
515 pstr->proc_info_entry = entry;
516
517#ifdef CONFIG_SND_PCM_XRUN_DEBUG
518 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
519 pstr->proc_root)) != NULL) {
520 entry->c.text.read = snd_pcm_xrun_debug_read;
521 entry->c.text.write = snd_pcm_xrun_debug_write;
522 entry->mode |= S_IWUSR;
523 entry->private_data = pstr;
524 if (snd_info_register(entry) < 0) {
525 snd_info_free_entry(entry);
526 entry = NULL;
527 }
528 }
529 pstr->proc_xrun_debug_entry = entry;
530#endif
531 return 0;
532}
533
534static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
535{
536#ifdef CONFIG_SND_PCM_XRUN_DEBUG
537 snd_info_free_entry(pstr->proc_xrun_debug_entry);
538 pstr->proc_xrun_debug_entry = NULL;
539#endif
540 snd_info_free_entry(pstr->proc_info_entry);
541 pstr->proc_info_entry = NULL;
542 snd_info_free_entry(pstr->proc_root);
543 pstr->proc_root = NULL;
544 return 0;
545}
546
547static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
548{
549 struct snd_info_entry *entry;
550 struct snd_card *card;
551 char name[16];
552
553 card = substream->pcm->card;
554
555 sprintf(name, "sub%i", substream->number);
556 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
557 return -ENOMEM;
558 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
559 if (snd_info_register(entry) < 0) {
560 snd_info_free_entry(entry);
561 return -ENOMEM;
562 }
563 substream->proc_root = entry;
564
565 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
566 snd_info_set_text_ops(entry, substream,
567 snd_pcm_substream_proc_info_read);
568 if (snd_info_register(entry) < 0) {
569 snd_info_free_entry(entry);
570 entry = NULL;
571 }
572 }
573 substream->proc_info_entry = entry;
574
575 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
576 snd_info_set_text_ops(entry, substream,
577 snd_pcm_substream_proc_hw_params_read);
578 if (snd_info_register(entry) < 0) {
579 snd_info_free_entry(entry);
580 entry = NULL;
581 }
582 }
583 substream->proc_hw_params_entry = entry;
584
585 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
586 snd_info_set_text_ops(entry, substream,
587 snd_pcm_substream_proc_sw_params_read);
588 if (snd_info_register(entry) < 0) {
589 snd_info_free_entry(entry);
590 entry = NULL;
591 }
592 }
593 substream->proc_sw_params_entry = entry;
594
595 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
596 snd_info_set_text_ops(entry, substream,
597 snd_pcm_substream_proc_status_read);
598 if (snd_info_register(entry) < 0) {
599 snd_info_free_entry(entry);
600 entry = NULL;
601 }
602 }
603 substream->proc_status_entry = entry;
604
605 return 0;
606}
607
608static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
609{
610 snd_info_free_entry(substream->proc_info_entry);
611 substream->proc_info_entry = NULL;
612 snd_info_free_entry(substream->proc_hw_params_entry);
613 substream->proc_hw_params_entry = NULL;
614 snd_info_free_entry(substream->proc_sw_params_entry);
615 substream->proc_sw_params_entry = NULL;
616 snd_info_free_entry(substream->proc_status_entry);
617 substream->proc_status_entry = NULL;
618 snd_info_free_entry(substream->proc_root);
619 substream->proc_root = NULL;
620 return 0;
621}
622#else /* !CONFIG_SND_VERBOSE_PROCFS */
623static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
624static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
625static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
626static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
627#endif /* CONFIG_SND_VERBOSE_PROCFS */
628
629/**
630 * snd_pcm_new_stream - create a new PCM stream
631 * @pcm: the pcm instance
632 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
633 * @substream_count: the number of substreams
634 *
635 * Creates a new stream for the pcm.
636 * The corresponding stream on the pcm must have been empty before
637 * calling this, i.e. zero must be given to the argument of
638 * snd_pcm_new().
639 *
640 * Returns zero if successful, or a negative error code on failure.
641 */
642int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
643{
644 int idx, err;
645 struct snd_pcm_str *pstr = &pcm->streams[stream];
646 struct snd_pcm_substream *substream, *prev;
647
648#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
649 mutex_init(&pstr->oss.setup_mutex);
650#endif
651 pstr->stream = stream;
652 pstr->pcm = pcm;
653 pstr->substream_count = substream_count;
654 if (substream_count > 0 && !pcm->internal) {
655 err = snd_pcm_stream_proc_init(pstr);
656 if (err < 0) {
657 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
658 return err;
659 }
660 }
661 prev = NULL;
662 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
663 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
664 if (substream == NULL) {
665 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
666 return -ENOMEM;
667 }
668 substream->pcm = pcm;
669 substream->pstr = pstr;
670 substream->number = idx;
671 substream->stream = stream;
672 sprintf(substream->name, "subdevice #%i", idx);
673 substream->buffer_bytes_max = UINT_MAX;
674 if (prev == NULL)
675 pstr->substream = substream;
676 else
677 prev->next = substream;
678
679 if (!pcm->internal) {
680 err = snd_pcm_substream_proc_init(substream);
681 if (err < 0) {
682 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
683 if (prev == NULL)
684 pstr->substream = NULL;
685 else
686 prev->next = NULL;
687 kfree(substream);
688 return err;
689 }
690 }
691 substream->group = &substream->self_group;
692 spin_lock_init(&substream->self_group.lock);
693 INIT_LIST_HEAD(&substream->self_group.substreams);
694 list_add_tail(&substream->link_list, &substream->self_group.substreams);
695 atomic_set(&substream->mmap_count, 0);
696 prev = substream;
697 }
698 return 0;
699}
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 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
715 if (snd_BUG_ON(!card))
716 return -ENXIO;
717 if (rpcm)
718 *rpcm = NULL;
719 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
720 if (pcm == NULL) {
721 snd_printk(KERN_ERR "Cannot allocate PCM\n");
722 return -ENOMEM;
723 }
724 pcm->card = card;
725 pcm->device = device;
726 pcm->internal = internal;
727 if (id)
728 strlcpy(pcm->id, id, sizeof(pcm->id));
729 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
730 snd_pcm_free(pcm);
731 return err;
732 }
733 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
734 snd_pcm_free(pcm);
735 return err;
736 }
737 mutex_init(&pcm->open_mutex);
738 init_waitqueue_head(&pcm->open_wait);
739 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
740 snd_pcm_free(pcm);
741 return err;
742 }
743 if (rpcm)
744 *rpcm = pcm;
745 return 0;
746}
747
748/**
749 * snd_pcm_new - create a new PCM instance
750 * @card: the card instance
751 * @id: the id string
752 * @device: the device index (zero based)
753 * @playback_count: the number of substreams for playback
754 * @capture_count: the number of substreams for capture
755 * @rpcm: the pointer to store the new pcm instance
756 *
757 * Creates a new PCM instance.
758 *
759 * The pcm operators have to be set afterwards to the new instance
760 * via snd_pcm_set_ops().
761 *
762 * Returns zero if successful, or a negative error code on failure.
763 */
764int snd_pcm_new(struct snd_card *card, const char *id, int device,
765 int playback_count, int capture_count, struct snd_pcm **rpcm)
766{
767 return _snd_pcm_new(card, id, device, playback_count, capture_count,
768 false, rpcm);
769}
770EXPORT_SYMBOL(snd_pcm_new);
771
772/**
773 * snd_pcm_new_internal - create a new internal PCM instance
774 * @card: the card instance
775 * @id: the id string
776 * @device: the device index (zero based - shared with normal PCMs)
777 * @playback_count: the number of substreams for playback
778 * @capture_count: the number of substreams for capture
779 * @rpcm: the pointer to store the new pcm instance
780 *
781 * Creates a new internal PCM instance with no userspace device or procfs
782 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
783 * will only be used internally by kernel drivers. i.e. it cannot be opened
784 * by userspace. It provides existing ASoC components drivers with a substream
785 * and access to any private data.
786 *
787 * The pcm operators have to be set afterwards to the new instance
788 * via snd_pcm_set_ops().
789 *
790 * Returns zero if successful, or a negative error code on failure.
791 */
792int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
793 int playback_count, int capture_count,
794 struct snd_pcm **rpcm)
795{
796 return _snd_pcm_new(card, id, device, playback_count, capture_count,
797 true, rpcm);
798}
799EXPORT_SYMBOL(snd_pcm_new_internal);
800
801static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
802{
803 struct snd_pcm_substream *substream, *substream_next;
804#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
805 struct snd_pcm_oss_setup *setup, *setupn;
806#endif
807 substream = pstr->substream;
808 while (substream) {
809 substream_next = substream->next;
810 snd_pcm_timer_done(substream);
811 snd_pcm_substream_proc_done(substream);
812 kfree(substream);
813 substream = substream_next;
814 }
815 snd_pcm_stream_proc_done(pstr);
816#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
817 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
818 setupn = setup->next;
819 kfree(setup->task_name);
820 kfree(setup);
821 }
822#endif
823}
824
825static int snd_pcm_free(struct snd_pcm *pcm)
826{
827 struct snd_pcm_notify *notify;
828
829 if (!pcm)
830 return 0;
831 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
832 notify->n_unregister(pcm);
833 }
834 if (pcm->private_free)
835 pcm->private_free(pcm);
836 snd_pcm_lib_preallocate_free_for_all(pcm);
837 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
838 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
839 kfree(pcm);
840 return 0;
841}
842
843static int snd_pcm_dev_free(struct snd_device *device)
844{
845 struct snd_pcm *pcm = device->device_data;
846 return snd_pcm_free(pcm);
847}
848
849int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
850 struct file *file,
851 struct snd_pcm_substream **rsubstream)
852{
853 struct snd_pcm_str * pstr;
854 struct snd_pcm_substream *substream;
855 struct snd_pcm_runtime *runtime;
856 struct snd_ctl_file *kctl;
857 struct snd_card *card;
858 int prefer_subdevice = -1;
859 size_t size;
860
861 if (snd_BUG_ON(!pcm || !rsubstream))
862 return -ENXIO;
863 *rsubstream = NULL;
864 pstr = &pcm->streams[stream];
865 if (pstr->substream == NULL || pstr->substream_count == 0)
866 return -ENODEV;
867
868 card = pcm->card;
869 read_lock(&card->ctl_files_rwlock);
870 list_for_each_entry(kctl, &card->ctl_files, list) {
871 if (kctl->pid == task_pid(current)) {
872 prefer_subdevice = kctl->prefer_pcm_subdevice;
873 if (prefer_subdevice != -1)
874 break;
875 }
876 }
877 read_unlock(&card->ctl_files_rwlock);
878
879 switch (stream) {
880 case SNDRV_PCM_STREAM_PLAYBACK:
881 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
882 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
883 if (SUBSTREAM_BUSY(substream))
884 return -EAGAIN;
885 }
886 }
887 break;
888 case SNDRV_PCM_STREAM_CAPTURE:
889 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
890 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
891 if (SUBSTREAM_BUSY(substream))
892 return -EAGAIN;
893 }
894 }
895 break;
896 default:
897 return -EINVAL;
898 }
899
900 if (file->f_flags & O_APPEND) {
901 if (prefer_subdevice < 0) {
902 if (pstr->substream_count > 1)
903 return -EINVAL; /* must be unique */
904 substream = pstr->substream;
905 } else {
906 for (substream = pstr->substream; substream;
907 substream = substream->next)
908 if (substream->number == prefer_subdevice)
909 break;
910 }
911 if (! substream)
912 return -ENODEV;
913 if (! SUBSTREAM_BUSY(substream))
914 return -EBADFD;
915 substream->ref_count++;
916 *rsubstream = substream;
917 return 0;
918 }
919
920 if (prefer_subdevice >= 0) {
921 for (substream = pstr->substream; substream; substream = substream->next)
922 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
923 goto __ok;
924 }
925 for (substream = pstr->substream; substream; substream = substream->next)
926 if (!SUBSTREAM_BUSY(substream))
927 break;
928 __ok:
929 if (substream == NULL)
930 return -EAGAIN;
931
932 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
933 if (runtime == NULL)
934 return -ENOMEM;
935
936 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
937 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
938 if (runtime->status == NULL) {
939 kfree(runtime);
940 return -ENOMEM;
941 }
942 memset((void*)runtime->status, 0, size);
943
944 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
945 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
946 if (runtime->control == NULL) {
947 snd_free_pages((void*)runtime->status,
948 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
949 kfree(runtime);
950 return -ENOMEM;
951 }
952 memset((void*)runtime->control, 0, size);
953
954 init_waitqueue_head(&runtime->sleep);
955 init_waitqueue_head(&runtime->tsleep);
956
957 runtime->status->state = SNDRV_PCM_STATE_OPEN;
958
959 substream->runtime = runtime;
960 substream->private_data = pcm->private_data;
961 substream->ref_count = 1;
962 substream->f_flags = file->f_flags;
963 substream->pid = get_pid(task_pid(current));
964 pstr->substream_opened++;
965 *rsubstream = substream;
966 return 0;
967}
968
969void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
970{
971 struct snd_pcm_runtime *runtime;
972
973 if (PCM_RUNTIME_CHECK(substream))
974 return;
975 runtime = substream->runtime;
976 if (runtime->private_free != NULL)
977 runtime->private_free(runtime);
978 snd_free_pages((void*)runtime->status,
979 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
980 snd_free_pages((void*)runtime->control,
981 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
982 kfree(runtime->hw_constraints.rules);
983#ifdef CONFIG_SND_PCM_XRUN_DEBUG
984 if (runtime->hwptr_log)
985 kfree(runtime->hwptr_log);
986#endif
987 kfree(runtime);
988 substream->runtime = NULL;
989 put_pid(substream->pid);
990 substream->pid = NULL;
991 substream->pstr->substream_opened--;
992}
993
994static ssize_t show_pcm_class(struct device *dev,
995 struct device_attribute *attr, char *buf)
996{
997 struct snd_pcm *pcm;
998 const char *str;
999 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1000 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1001 [SNDRV_PCM_CLASS_MULTI] = "multi",
1002 [SNDRV_PCM_CLASS_MODEM] = "modem",
1003 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1004 };
1005
1006 if (! (pcm = dev_get_drvdata(dev)) ||
1007 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1008 str = "none";
1009 else
1010 str = strs[pcm->dev_class];
1011 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1012}
1013
1014static struct device_attribute pcm_attrs =
1015 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1016
1017static int snd_pcm_dev_register(struct snd_device *device)
1018{
1019 int cidx, err;
1020 struct snd_pcm_substream *substream;
1021 struct snd_pcm_notify *notify;
1022 char str[16];
1023 struct snd_pcm *pcm;
1024 struct device *dev;
1025
1026 if (snd_BUG_ON(!device || !device->device_data))
1027 return -ENXIO;
1028 pcm = device->device_data;
1029 mutex_lock(®ister_mutex);
1030 err = snd_pcm_add(pcm);
1031 if (err) {
1032 mutex_unlock(®ister_mutex);
1033 return err;
1034 }
1035 for (cidx = 0; cidx < 2; cidx++) {
1036 int devtype = -1;
1037 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1038 continue;
1039 switch (cidx) {
1040 case SNDRV_PCM_STREAM_PLAYBACK:
1041 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1042 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1043 break;
1044 case SNDRV_PCM_STREAM_CAPTURE:
1045 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1046 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1047 break;
1048 }
1049 /* device pointer to use, pcm->dev takes precedence if
1050 * it is assigned, otherwise fall back to card's device
1051 * if possible */
1052 dev = pcm->dev;
1053 if (!dev)
1054 dev = snd_card_get_device_link(pcm->card);
1055 /* register pcm */
1056 err = snd_register_device_for_dev(devtype, pcm->card,
1057 pcm->device,
1058 &snd_pcm_f_ops[cidx],
1059 pcm, str, dev);
1060 if (err < 0) {
1061 list_del(&pcm->list);
1062 mutex_unlock(®ister_mutex);
1063 return err;
1064 }
1065 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1066 &pcm_attrs);
1067 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1068 snd_pcm_timer_init(substream);
1069 }
1070
1071 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1072 notify->n_register(pcm);
1073
1074 mutex_unlock(®ister_mutex);
1075 return 0;
1076}
1077
1078static int snd_pcm_dev_disconnect(struct snd_device *device)
1079{
1080 struct snd_pcm *pcm = device->device_data;
1081 struct snd_pcm_notify *notify;
1082 struct snd_pcm_substream *substream;
1083 int cidx, devtype;
1084
1085 mutex_lock(®ister_mutex);
1086 if (list_empty(&pcm->list))
1087 goto unlock;
1088
1089 list_del_init(&pcm->list);
1090 for (cidx = 0; cidx < 2; cidx++)
1091 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1092 if (substream->runtime)
1093 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1094 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1095 notify->n_disconnect(pcm);
1096 }
1097 for (cidx = 0; cidx < 2; cidx++) {
1098 devtype = -1;
1099 switch (cidx) {
1100 case SNDRV_PCM_STREAM_PLAYBACK:
1101 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1102 break;
1103 case SNDRV_PCM_STREAM_CAPTURE:
1104 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1105 break;
1106 }
1107 snd_unregister_device(devtype, pcm->card, pcm->device);
1108 }
1109 unlock:
1110 mutex_unlock(®ister_mutex);
1111 return 0;
1112}
1113
1114int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1115{
1116 struct snd_pcm *pcm;
1117
1118 if (snd_BUG_ON(!notify ||
1119 !notify->n_register ||
1120 !notify->n_unregister ||
1121 !notify->n_disconnect))
1122 return -EINVAL;
1123 mutex_lock(®ister_mutex);
1124 if (nfree) {
1125 list_del(¬ify->list);
1126 list_for_each_entry(pcm, &snd_pcm_devices, list)
1127 notify->n_unregister(pcm);
1128 } else {
1129 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1130 list_for_each_entry(pcm, &snd_pcm_devices, list)
1131 notify->n_register(pcm);
1132 }
1133 mutex_unlock(®ister_mutex);
1134 return 0;
1135}
1136
1137EXPORT_SYMBOL(snd_pcm_notify);
1138
1139#ifdef CONFIG_PROC_FS
1140/*
1141 * Info interface
1142 */
1143
1144static void snd_pcm_proc_read(struct snd_info_entry *entry,
1145 struct snd_info_buffer *buffer)
1146{
1147 struct snd_pcm *pcm;
1148
1149 mutex_lock(®ister_mutex);
1150 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1151 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1152 pcm->card->number, pcm->device, pcm->id, pcm->name);
1153 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1154 snd_iprintf(buffer, " : playback %i",
1155 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1156 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1157 snd_iprintf(buffer, " : capture %i",
1158 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1159 snd_iprintf(buffer, "\n");
1160 }
1161 mutex_unlock(®ister_mutex);
1162}
1163
1164static struct snd_info_entry *snd_pcm_proc_entry;
1165
1166static void snd_pcm_proc_init(void)
1167{
1168 struct snd_info_entry *entry;
1169
1170 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1171 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1172 if (snd_info_register(entry) < 0) {
1173 snd_info_free_entry(entry);
1174 entry = NULL;
1175 }
1176 }
1177 snd_pcm_proc_entry = entry;
1178}
1179
1180static void snd_pcm_proc_done(void)
1181{
1182 snd_info_free_entry(snd_pcm_proc_entry);
1183}
1184
1185#else /* !CONFIG_PROC_FS */
1186#define snd_pcm_proc_init()
1187#define snd_pcm_proc_done()
1188#endif /* CONFIG_PROC_FS */
1189
1190
1191/*
1192 * ENTRY functions
1193 */
1194
1195static int __init alsa_pcm_init(void)
1196{
1197 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1198 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1199 snd_pcm_proc_init();
1200 return 0;
1201}
1202
1203static void __exit alsa_pcm_exit(void)
1204{
1205 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1206 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1207 snd_pcm_proc_done();
1208}
1209
1210module_init(alsa_pcm_init)
1211module_exit(alsa_pcm_exit)