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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 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 FORMAT(S20_LE),
215 FORMAT(S20_BE),
216 FORMAT(U20_LE),
217 FORMAT(U20_BE),
218};
219
220/**
221 * snd_pcm_format_name - Return a name string for the given PCM format
222 * @format: PCM format
223 *
224 * Return: the format name string
225 */
226const char *snd_pcm_format_name(snd_pcm_format_t format)
227{
228 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
229 return "Unknown";
230 return snd_pcm_format_names[(__force unsigned int)format];
231}
232EXPORT_SYMBOL_GPL(snd_pcm_format_name);
233
234#ifdef CONFIG_SND_VERBOSE_PROCFS
235
236#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
237#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
238#define READY(v) [SNDRV_PCM_READY_##v] = #v
239#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
240#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
241#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
242#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
243#define START(v) [SNDRV_PCM_START_##v] = #v
244#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
245
246static const char * const snd_pcm_stream_names[] = {
247 STREAM(PLAYBACK),
248 STREAM(CAPTURE),
249};
250
251static const char * const snd_pcm_state_names[] = {
252 STATE(OPEN),
253 STATE(SETUP),
254 STATE(PREPARED),
255 STATE(RUNNING),
256 STATE(XRUN),
257 STATE(DRAINING),
258 STATE(PAUSED),
259 STATE(SUSPENDED),
260 STATE(DISCONNECTED),
261};
262
263static const char * const snd_pcm_access_names[] = {
264 ACCESS(MMAP_INTERLEAVED),
265 ACCESS(MMAP_NONINTERLEAVED),
266 ACCESS(MMAP_COMPLEX),
267 ACCESS(RW_INTERLEAVED),
268 ACCESS(RW_NONINTERLEAVED),
269};
270
271static const char * const snd_pcm_subformat_names[] = {
272 SUBFORMAT(STD),
273 SUBFORMAT(MSBITS_MAX),
274 SUBFORMAT(MSBITS_20),
275 SUBFORMAT(MSBITS_24),
276};
277
278static const char * const snd_pcm_tstamp_mode_names[] = {
279 TSTAMP(NONE),
280 TSTAMP(ENABLE),
281};
282
283static const char *snd_pcm_stream_name(int stream)
284{
285 return snd_pcm_stream_names[stream];
286}
287
288static const char *snd_pcm_access_name(snd_pcm_access_t access)
289{
290 return snd_pcm_access_names[(__force int)access];
291}
292
293static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
294{
295 return snd_pcm_subformat_names[(__force int)subformat];
296}
297
298static const char *snd_pcm_tstamp_mode_name(int mode)
299{
300 return snd_pcm_tstamp_mode_names[mode];
301}
302
303static const char *snd_pcm_state_name(snd_pcm_state_t state)
304{
305 return snd_pcm_state_names[(__force int)state];
306}
307
308#if IS_ENABLED(CONFIG_SND_PCM_OSS)
309#include <linux/soundcard.h>
310
311static const char *snd_pcm_oss_format_name(int format)
312{
313 switch (format) {
314 case AFMT_MU_LAW:
315 return "MU_LAW";
316 case AFMT_A_LAW:
317 return "A_LAW";
318 case AFMT_IMA_ADPCM:
319 return "IMA_ADPCM";
320 case AFMT_U8:
321 return "U8";
322 case AFMT_S16_LE:
323 return "S16_LE";
324 case AFMT_S16_BE:
325 return "S16_BE";
326 case AFMT_S8:
327 return "S8";
328 case AFMT_U16_LE:
329 return "U16_LE";
330 case AFMT_U16_BE:
331 return "U16_BE";
332 case AFMT_MPEG:
333 return "MPEG";
334 default:
335 return "unknown";
336 }
337}
338#endif
339
340static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
341 struct snd_info_buffer *buffer)
342{
343 struct snd_pcm_info *info;
344 int err;
345
346 if (! substream)
347 return;
348
349 info = kmalloc(sizeof(*info), GFP_KERNEL);
350 if (!info)
351 return;
352
353 err = snd_pcm_info(substream, info);
354 if (err < 0) {
355 snd_iprintf(buffer, "error %d\n", err);
356 kfree(info);
357 return;
358 }
359 snd_iprintf(buffer, "card: %d\n", info->card);
360 snd_iprintf(buffer, "device: %d\n", info->device);
361 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
362 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
363 snd_iprintf(buffer, "id: %s\n", info->id);
364 snd_iprintf(buffer, "name: %s\n", info->name);
365 snd_iprintf(buffer, "subname: %s\n", info->subname);
366 snd_iprintf(buffer, "class: %d\n", info->dev_class);
367 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
368 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
369 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
370 kfree(info);
371}
372
373static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
374 struct snd_info_buffer *buffer)
375{
376 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
377 buffer);
378}
379
380static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
381 struct snd_info_buffer *buffer)
382{
383 snd_pcm_proc_info_read(entry->private_data, buffer);
384}
385
386static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
387 struct snd_info_buffer *buffer)
388{
389 struct snd_pcm_substream *substream = entry->private_data;
390 struct snd_pcm_runtime *runtime;
391
392 mutex_lock(&substream->pcm->open_mutex);
393 runtime = substream->runtime;
394 if (!runtime) {
395 snd_iprintf(buffer, "closed\n");
396 goto unlock;
397 }
398 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
399 snd_iprintf(buffer, "no setup\n");
400 goto unlock;
401 }
402 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
403 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
404 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
405 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
406 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
407 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
408 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
409#if IS_ENABLED(CONFIG_SND_PCM_OSS)
410 if (substream->oss.oss) {
411 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
412 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
413 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
414 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
415 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
416 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
417 }
418#endif
419 unlock:
420 mutex_unlock(&substream->pcm->open_mutex);
421}
422
423static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
424 struct snd_info_buffer *buffer)
425{
426 struct snd_pcm_substream *substream = entry->private_data;
427 struct snd_pcm_runtime *runtime;
428
429 mutex_lock(&substream->pcm->open_mutex);
430 runtime = substream->runtime;
431 if (!runtime) {
432 snd_iprintf(buffer, "closed\n");
433 goto unlock;
434 }
435 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
436 snd_iprintf(buffer, "no setup\n");
437 goto unlock;
438 }
439 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
440 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
441 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
442 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
443 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
444 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
445 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
446 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
447 unlock:
448 mutex_unlock(&substream->pcm->open_mutex);
449}
450
451static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
452 struct snd_info_buffer *buffer)
453{
454 struct snd_pcm_substream *substream = entry->private_data;
455 struct snd_pcm_runtime *runtime;
456 struct snd_pcm_status64 status;
457 int err;
458
459 mutex_lock(&substream->pcm->open_mutex);
460 runtime = substream->runtime;
461 if (!runtime) {
462 snd_iprintf(buffer, "closed\n");
463 goto unlock;
464 }
465 memset(&status, 0, sizeof(status));
466 err = snd_pcm_status64(substream, &status);
467 if (err < 0) {
468 snd_iprintf(buffer, "error %d\n", err);
469 goto unlock;
470 }
471 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
472 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
473 snd_iprintf(buffer, "trigger_time: %lld.%09lld\n",
474 status.trigger_tstamp_sec, status.trigger_tstamp_nsec);
475 snd_iprintf(buffer, "tstamp : %lld.%09lld\n",
476 status.tstamp_sec, status.tstamp_nsec);
477 snd_iprintf(buffer, "delay : %ld\n", status.delay);
478 snd_iprintf(buffer, "avail : %ld\n", status.avail);
479 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
480 snd_iprintf(buffer, "-----\n");
481 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
482 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
483 unlock:
484 mutex_unlock(&substream->pcm->open_mutex);
485}
486
487#ifdef CONFIG_SND_PCM_XRUN_DEBUG
488static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
489 struct snd_info_buffer *buffer)
490{
491 struct snd_pcm_substream *substream = entry->private_data;
492
493 snd_pcm_stop_xrun(substream);
494}
495
496static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
497 struct snd_info_buffer *buffer)
498{
499 struct snd_pcm_str *pstr = entry->private_data;
500 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
501}
502
503static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
504 struct snd_info_buffer *buffer)
505{
506 struct snd_pcm_str *pstr = entry->private_data;
507 char line[64];
508 if (!snd_info_get_line(buffer, line, sizeof(line)))
509 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
510}
511#endif
512
513static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
514{
515 struct snd_pcm *pcm = pstr->pcm;
516 struct snd_info_entry *entry;
517 char name[16];
518
519 sprintf(name, "pcm%i%c", pcm->device,
520 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
521 entry = snd_info_create_card_entry(pcm->card, name,
522 pcm->card->proc_root);
523 if (!entry)
524 return -ENOMEM;
525 entry->mode = S_IFDIR | 0555;
526 pstr->proc_root = entry;
527 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
528 if (entry)
529 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
530#ifdef CONFIG_SND_PCM_XRUN_DEBUG
531 entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
532 pstr->proc_root);
533 if (entry) {
534 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
535 entry->c.text.write = snd_pcm_xrun_debug_write;
536 entry->mode |= 0200;
537 }
538#endif
539 return 0;
540}
541
542static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
543{
544 snd_info_free_entry(pstr->proc_root);
545 pstr->proc_root = NULL;
546 return 0;
547}
548
549static struct snd_info_entry *
550create_substream_info_entry(struct snd_pcm_substream *substream,
551 const char *name,
552 void (*read)(struct snd_info_entry *,
553 struct snd_info_buffer *))
554{
555 struct snd_info_entry *entry;
556
557 entry = snd_info_create_card_entry(substream->pcm->card, name,
558 substream->proc_root);
559 if (entry)
560 snd_info_set_text_ops(entry, substream, read);
561 return entry;
562}
563
564static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
565{
566 struct snd_info_entry *entry;
567 struct snd_card *card;
568 char name[16];
569
570 card = substream->pcm->card;
571
572 sprintf(name, "sub%i", substream->number);
573 entry = snd_info_create_card_entry(card, name,
574 substream->pstr->proc_root);
575 if (!entry)
576 return -ENOMEM;
577 entry->mode = S_IFDIR | 0555;
578 substream->proc_root = entry;
579
580 create_substream_info_entry(substream, "info",
581 snd_pcm_substream_proc_info_read);
582 create_substream_info_entry(substream, "hw_params",
583 snd_pcm_substream_proc_hw_params_read);
584 create_substream_info_entry(substream, "sw_params",
585 snd_pcm_substream_proc_sw_params_read);
586 create_substream_info_entry(substream, "status",
587 snd_pcm_substream_proc_status_read);
588
589#ifdef CONFIG_SND_PCM_XRUN_DEBUG
590 entry = create_substream_info_entry(substream, "xrun_injection", NULL);
591 if (entry) {
592 entry->c.text.write = snd_pcm_xrun_injection_write;
593 entry->mode = S_IFREG | 0200;
594 }
595#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
596
597 return 0;
598}
599
600#else /* !CONFIG_SND_VERBOSE_PROCFS */
601static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
602static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
603static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
604#endif /* CONFIG_SND_VERBOSE_PROCFS */
605
606static const struct attribute_group *pcm_dev_attr_groups[];
607
608/*
609 * PM callbacks: we need to deal only with suspend here, as the resume is
610 * triggered either from user-space or the driver's resume callback
611 */
612#ifdef CONFIG_PM_SLEEP
613static int do_pcm_suspend(struct device *dev)
614{
615 struct snd_pcm_str *pstr = dev_get_drvdata(dev);
616
617 if (!pstr->pcm->no_device_suspend)
618 snd_pcm_suspend_all(pstr->pcm);
619 return 0;
620}
621#endif
622
623static const struct dev_pm_ops pcm_dev_pm_ops = {
624 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
625};
626
627/* device type for PCM -- basically only for passing PM callbacks */
628static const struct device_type pcm_dev_type = {
629 .name = "pcm",
630 .pm = &pcm_dev_pm_ops,
631};
632
633/**
634 * snd_pcm_new_stream - create a new PCM stream
635 * @pcm: the pcm instance
636 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
637 * @substream_count: the number of substreams
638 *
639 * Creates a new stream for the pcm.
640 * The corresponding stream on the pcm must have been empty before
641 * calling this, i.e. zero must be given to the argument of
642 * snd_pcm_new().
643 *
644 * Return: Zero if successful, or a negative error code on failure.
645 */
646int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
647{
648 int idx, err;
649 struct snd_pcm_str *pstr = &pcm->streams[stream];
650 struct snd_pcm_substream *substream, *prev;
651
652#if IS_ENABLED(CONFIG_SND_PCM_OSS)
653 mutex_init(&pstr->oss.setup_mutex);
654#endif
655 pstr->stream = stream;
656 pstr->pcm = pcm;
657 pstr->substream_count = substream_count;
658 if (!substream_count)
659 return 0;
660
661 err = snd_device_alloc(&pstr->dev, pcm->card);
662 if (err < 0)
663 return err;
664 dev_set_name(pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
665 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
666 pstr->dev->groups = pcm_dev_attr_groups;
667 pstr->dev->type = &pcm_dev_type;
668 dev_set_drvdata(pstr->dev, pstr);
669
670 if (!pcm->internal) {
671 err = snd_pcm_stream_proc_init(pstr);
672 if (err < 0) {
673 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
674 return err;
675 }
676 }
677 prev = NULL;
678 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
679 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
680 if (!substream)
681 return -ENOMEM;
682 substream->pcm = pcm;
683 substream->pstr = pstr;
684 substream->number = idx;
685 substream->stream = stream;
686 sprintf(substream->name, "subdevice #%i", idx);
687 substream->buffer_bytes_max = UINT_MAX;
688 if (prev == NULL)
689 pstr->substream = substream;
690 else
691 prev->next = substream;
692
693 if (!pcm->internal) {
694 err = snd_pcm_substream_proc_init(substream);
695 if (err < 0) {
696 pcm_err(pcm,
697 "Error in snd_pcm_stream_proc_init\n");
698 if (prev == NULL)
699 pstr->substream = NULL;
700 else
701 prev->next = NULL;
702 kfree(substream);
703 return err;
704 }
705 }
706 substream->group = &substream->self_group;
707 snd_pcm_group_init(&substream->self_group);
708 list_add_tail(&substream->link_list, &substream->self_group.substreams);
709 atomic_set(&substream->mmap_count, 0);
710 prev = substream;
711 }
712 return 0;
713}
714EXPORT_SYMBOL(snd_pcm_new_stream);
715
716static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
717 int playback_count, int capture_count, bool internal,
718 struct snd_pcm **rpcm)
719{
720 struct snd_pcm *pcm;
721 int err;
722 static const struct snd_device_ops ops = {
723 .dev_free = snd_pcm_dev_free,
724 .dev_register = snd_pcm_dev_register,
725 .dev_disconnect = snd_pcm_dev_disconnect,
726 };
727 static const struct snd_device_ops internal_ops = {
728 .dev_free = snd_pcm_dev_free,
729 };
730
731 if (snd_BUG_ON(!card))
732 return -ENXIO;
733 if (rpcm)
734 *rpcm = NULL;
735 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
736 if (!pcm)
737 return -ENOMEM;
738 pcm->card = card;
739 pcm->device = device;
740 pcm->internal = internal;
741 mutex_init(&pcm->open_mutex);
742 init_waitqueue_head(&pcm->open_wait);
743 INIT_LIST_HEAD(&pcm->list);
744 if (id)
745 strscpy(pcm->id, id, sizeof(pcm->id));
746
747 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
748 playback_count);
749 if (err < 0)
750 goto free_pcm;
751
752 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
753 if (err < 0)
754 goto free_pcm;
755
756 err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
757 internal ? &internal_ops : &ops);
758 if (err < 0)
759 goto free_pcm;
760
761 if (rpcm)
762 *rpcm = pcm;
763 return 0;
764
765free_pcm:
766 snd_pcm_free(pcm);
767 return err;
768}
769
770/**
771 * snd_pcm_new - create a new PCM instance
772 * @card: the card instance
773 * @id: the id string
774 * @device: the device index (zero based)
775 * @playback_count: the number of substreams for playback
776 * @capture_count: the number of substreams for capture
777 * @rpcm: the pointer to store the new pcm instance
778 *
779 * Creates a new PCM instance.
780 *
781 * The pcm operators have to be set afterwards to the new instance
782 * via snd_pcm_set_ops().
783 *
784 * Return: Zero if successful, or a negative error code on failure.
785 */
786int snd_pcm_new(struct snd_card *card, const char *id, int device,
787 int playback_count, int capture_count, struct snd_pcm **rpcm)
788{
789 return _snd_pcm_new(card, id, device, playback_count, capture_count,
790 false, rpcm);
791}
792EXPORT_SYMBOL(snd_pcm_new);
793
794/**
795 * snd_pcm_new_internal - create a new internal PCM instance
796 * @card: the card instance
797 * @id: the id string
798 * @device: the device index (zero based - shared with normal PCMs)
799 * @playback_count: the number of substreams for playback
800 * @capture_count: the number of substreams for capture
801 * @rpcm: the pointer to store the new pcm instance
802 *
803 * Creates a new internal PCM instance with no userspace device or procfs
804 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
805 * will only be used internally by kernel drivers. i.e. it cannot be opened
806 * by userspace. It provides existing ASoC components drivers with a substream
807 * and access to any private data.
808 *
809 * The pcm operators have to be set afterwards to the new instance
810 * via snd_pcm_set_ops().
811 *
812 * Return: Zero if successful, or a negative error code on failure.
813 */
814int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
815 int playback_count, int capture_count,
816 struct snd_pcm **rpcm)
817{
818 return _snd_pcm_new(card, id, device, playback_count, capture_count,
819 true, rpcm);
820}
821EXPORT_SYMBOL(snd_pcm_new_internal);
822
823static void free_chmap(struct snd_pcm_str *pstr)
824{
825 if (pstr->chmap_kctl) {
826 struct snd_card *card = pstr->pcm->card;
827
828 snd_ctl_remove(card, pstr->chmap_kctl);
829 pstr->chmap_kctl = NULL;
830 }
831}
832
833static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
834{
835 struct snd_pcm_substream *substream, *substream_next;
836#if IS_ENABLED(CONFIG_SND_PCM_OSS)
837 struct snd_pcm_oss_setup *setup, *setupn;
838#endif
839
840 /* free all proc files under the stream */
841 snd_pcm_stream_proc_done(pstr);
842
843 substream = pstr->substream;
844 while (substream) {
845 substream_next = substream->next;
846 snd_pcm_timer_done(substream);
847 kfree(substream);
848 substream = substream_next;
849 }
850#if IS_ENABLED(CONFIG_SND_PCM_OSS)
851 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
852 setupn = setup->next;
853 kfree(setup->task_name);
854 kfree(setup);
855 }
856#endif
857 free_chmap(pstr);
858 if (pstr->substream_count)
859 put_device(pstr->dev);
860}
861
862#if IS_ENABLED(CONFIG_SND_PCM_OSS)
863#define pcm_call_notify(pcm, call) \
864 do { \
865 struct snd_pcm_notify *_notify; \
866 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
867 _notify->call(pcm); \
868 } while (0)
869#else
870#define pcm_call_notify(pcm, call) do {} while (0)
871#endif
872
873static int snd_pcm_free(struct snd_pcm *pcm)
874{
875 if (!pcm)
876 return 0;
877 if (!pcm->internal)
878 pcm_call_notify(pcm, n_unregister);
879 if (pcm->private_free)
880 pcm->private_free(pcm);
881 snd_pcm_lib_preallocate_free_for_all(pcm);
882 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
883 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
884 kfree(pcm);
885 return 0;
886}
887
888static int snd_pcm_dev_free(struct snd_device *device)
889{
890 struct snd_pcm *pcm = device->device_data;
891 return snd_pcm_free(pcm);
892}
893
894int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
895 struct file *file,
896 struct snd_pcm_substream **rsubstream)
897{
898 struct snd_pcm_str * pstr;
899 struct snd_pcm_substream *substream;
900 struct snd_pcm_runtime *runtime;
901 struct snd_card *card;
902 int prefer_subdevice;
903 size_t size;
904
905 if (snd_BUG_ON(!pcm || !rsubstream))
906 return -ENXIO;
907 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
908 stream != SNDRV_PCM_STREAM_CAPTURE))
909 return -EINVAL;
910 *rsubstream = NULL;
911 pstr = &pcm->streams[stream];
912 if (pstr->substream == NULL || pstr->substream_count == 0)
913 return -ENODEV;
914
915 card = pcm->card;
916 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
917
918 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
919 int opposite = !stream;
920
921 for (substream = pcm->streams[opposite].substream; substream;
922 substream = substream->next) {
923 if (SUBSTREAM_BUSY(substream))
924 return -EAGAIN;
925 }
926 }
927
928 if (file->f_flags & O_APPEND) {
929 if (prefer_subdevice < 0) {
930 if (pstr->substream_count > 1)
931 return -EINVAL; /* must be unique */
932 substream = pstr->substream;
933 } else {
934 for (substream = pstr->substream; substream;
935 substream = substream->next)
936 if (substream->number == prefer_subdevice)
937 break;
938 }
939 if (! substream)
940 return -ENODEV;
941 if (! SUBSTREAM_BUSY(substream))
942 return -EBADFD;
943 substream->ref_count++;
944 *rsubstream = substream;
945 return 0;
946 }
947
948 for (substream = pstr->substream; substream; substream = substream->next) {
949 if (!SUBSTREAM_BUSY(substream) &&
950 (prefer_subdevice == -1 ||
951 substream->number == prefer_subdevice))
952 break;
953 }
954 if (substream == NULL)
955 return -EAGAIN;
956
957 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
958 if (runtime == NULL)
959 return -ENOMEM;
960
961 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
962 runtime->status = alloc_pages_exact(size, GFP_KERNEL);
963 if (runtime->status == NULL) {
964 kfree(runtime);
965 return -ENOMEM;
966 }
967 memset(runtime->status, 0, size);
968
969 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
970 runtime->control = alloc_pages_exact(size, GFP_KERNEL);
971 if (runtime->control == NULL) {
972 free_pages_exact(runtime->status,
973 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
974 kfree(runtime);
975 return -ENOMEM;
976 }
977 memset(runtime->control, 0, size);
978
979 init_waitqueue_head(&runtime->sleep);
980 init_waitqueue_head(&runtime->tsleep);
981
982 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_OPEN);
983 mutex_init(&runtime->buffer_mutex);
984 atomic_set(&runtime->buffer_accessing, 0);
985
986 substream->runtime = runtime;
987 substream->private_data = pcm->private_data;
988 substream->ref_count = 1;
989 substream->f_flags = file->f_flags;
990 substream->pid = get_pid(task_pid(current));
991 pstr->substream_opened++;
992 *rsubstream = substream;
993 return 0;
994}
995
996void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
997{
998 struct snd_pcm_runtime *runtime;
999
1000 if (PCM_RUNTIME_CHECK(substream))
1001 return;
1002 runtime = substream->runtime;
1003 if (runtime->private_free != NULL)
1004 runtime->private_free(runtime);
1005 free_pages_exact(runtime->status,
1006 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1007 free_pages_exact(runtime->control,
1008 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1009 kfree(runtime->hw_constraints.rules);
1010 /* Avoid concurrent access to runtime via PCM timer interface */
1011 if (substream->timer) {
1012 spin_lock_irq(&substream->timer->lock);
1013 substream->runtime = NULL;
1014 spin_unlock_irq(&substream->timer->lock);
1015 } else {
1016 substream->runtime = NULL;
1017 }
1018 mutex_destroy(&runtime->buffer_mutex);
1019 snd_fasync_free(runtime->fasync);
1020 kfree(runtime);
1021 put_pid(substream->pid);
1022 substream->pid = NULL;
1023 substream->pstr->substream_opened--;
1024}
1025
1026static ssize_t pcm_class_show(struct device *dev,
1027 struct device_attribute *attr, char *buf)
1028{
1029 struct snd_pcm_str *pstr = dev_get_drvdata(dev);
1030 struct snd_pcm *pcm = pstr->pcm;
1031 const char *str;
1032 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1033 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1034 [SNDRV_PCM_CLASS_MULTI] = "multi",
1035 [SNDRV_PCM_CLASS_MODEM] = "modem",
1036 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1037 };
1038
1039 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1040 str = "none";
1041 else
1042 str = strs[pcm->dev_class];
1043 return sysfs_emit(buf, "%s\n", str);
1044}
1045
1046static DEVICE_ATTR_RO(pcm_class);
1047static struct attribute *pcm_dev_attrs[] = {
1048 &dev_attr_pcm_class.attr,
1049 NULL
1050};
1051
1052static const struct attribute_group pcm_dev_attr_group = {
1053 .attrs = pcm_dev_attrs,
1054};
1055
1056static const struct attribute_group *pcm_dev_attr_groups[] = {
1057 &pcm_dev_attr_group,
1058 NULL
1059};
1060
1061static int snd_pcm_dev_register(struct snd_device *device)
1062{
1063 int cidx, err;
1064 struct snd_pcm_substream *substream;
1065 struct snd_pcm *pcm;
1066
1067 if (snd_BUG_ON(!device || !device->device_data))
1068 return -ENXIO;
1069 pcm = device->device_data;
1070
1071 mutex_lock(®ister_mutex);
1072 err = snd_pcm_add(pcm);
1073 if (err)
1074 goto unlock;
1075 for (cidx = 0; cidx < 2; cidx++) {
1076 int devtype = -1;
1077 if (pcm->streams[cidx].substream == NULL)
1078 continue;
1079 switch (cidx) {
1080 case SNDRV_PCM_STREAM_PLAYBACK:
1081 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1082 break;
1083 case SNDRV_PCM_STREAM_CAPTURE:
1084 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1085 break;
1086 }
1087 /* register pcm */
1088 err = snd_register_device(devtype, pcm->card, pcm->device,
1089 &snd_pcm_f_ops[cidx], pcm,
1090 pcm->streams[cidx].dev);
1091 if (err < 0) {
1092 list_del_init(&pcm->list);
1093 goto unlock;
1094 }
1095
1096 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1097 snd_pcm_timer_init(substream);
1098 }
1099
1100 pcm_call_notify(pcm, n_register);
1101
1102 unlock:
1103 mutex_unlock(®ister_mutex);
1104 return err;
1105}
1106
1107static int snd_pcm_dev_disconnect(struct snd_device *device)
1108{
1109 struct snd_pcm *pcm = device->device_data;
1110 struct snd_pcm_substream *substream;
1111 int cidx;
1112
1113 mutex_lock(®ister_mutex);
1114 mutex_lock(&pcm->open_mutex);
1115 wake_up(&pcm->open_wait);
1116 list_del_init(&pcm->list);
1117
1118 for_each_pcm_substream(pcm, cidx, substream) {
1119 snd_pcm_stream_lock_irq(substream);
1120 if (substream->runtime) {
1121 if (snd_pcm_running(substream))
1122 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
1123 /* to be sure, set the state unconditionally */
1124 __snd_pcm_set_state(substream->runtime,
1125 SNDRV_PCM_STATE_DISCONNECTED);
1126 wake_up(&substream->runtime->sleep);
1127 wake_up(&substream->runtime->tsleep);
1128 }
1129 snd_pcm_stream_unlock_irq(substream);
1130 }
1131
1132 for_each_pcm_substream(pcm, cidx, substream)
1133 snd_pcm_sync_stop(substream, false);
1134
1135 pcm_call_notify(pcm, n_disconnect);
1136 for (cidx = 0; cidx < 2; cidx++) {
1137 if (pcm->streams[cidx].dev)
1138 snd_unregister_device(pcm->streams[cidx].dev);
1139 free_chmap(&pcm->streams[cidx]);
1140 }
1141 mutex_unlock(&pcm->open_mutex);
1142 mutex_unlock(®ister_mutex);
1143 return 0;
1144}
1145
1146#if IS_ENABLED(CONFIG_SND_PCM_OSS)
1147/**
1148 * snd_pcm_notify - Add/remove the notify list
1149 * @notify: PCM notify list
1150 * @nfree: 0 = register, 1 = unregister
1151 *
1152 * This adds the given notifier to the global list so that the callback is
1153 * called for each registered PCM devices. This exists only for PCM OSS
1154 * emulation, so far.
1155 *
1156 * Return: zero if successful, or a negative error code
1157 */
1158int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1159{
1160 struct snd_pcm *pcm;
1161
1162 if (snd_BUG_ON(!notify ||
1163 !notify->n_register ||
1164 !notify->n_unregister ||
1165 !notify->n_disconnect))
1166 return -EINVAL;
1167 mutex_lock(®ister_mutex);
1168 if (nfree) {
1169 list_del(¬ify->list);
1170 list_for_each_entry(pcm, &snd_pcm_devices, list)
1171 notify->n_unregister(pcm);
1172 } else {
1173 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1174 list_for_each_entry(pcm, &snd_pcm_devices, list)
1175 notify->n_register(pcm);
1176 }
1177 mutex_unlock(®ister_mutex);
1178 return 0;
1179}
1180EXPORT_SYMBOL(snd_pcm_notify);
1181#endif /* CONFIG_SND_PCM_OSS */
1182
1183#ifdef CONFIG_SND_PROC_FS
1184/*
1185 * Info interface
1186 */
1187
1188static void snd_pcm_proc_read(struct snd_info_entry *entry,
1189 struct snd_info_buffer *buffer)
1190{
1191 struct snd_pcm *pcm;
1192
1193 mutex_lock(®ister_mutex);
1194 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1195 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1196 pcm->card->number, pcm->device, pcm->id, pcm->name);
1197 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1198 snd_iprintf(buffer, " : playback %i",
1199 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1200 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1201 snd_iprintf(buffer, " : capture %i",
1202 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1203 snd_iprintf(buffer, "\n");
1204 }
1205 mutex_unlock(®ister_mutex);
1206}
1207
1208static struct snd_info_entry *snd_pcm_proc_entry;
1209
1210static void snd_pcm_proc_init(void)
1211{
1212 struct snd_info_entry *entry;
1213
1214 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
1215 if (entry) {
1216 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1217 if (snd_info_register(entry) < 0) {
1218 snd_info_free_entry(entry);
1219 entry = NULL;
1220 }
1221 }
1222 snd_pcm_proc_entry = entry;
1223}
1224
1225static void snd_pcm_proc_done(void)
1226{
1227 snd_info_free_entry(snd_pcm_proc_entry);
1228}
1229
1230#else /* !CONFIG_SND_PROC_FS */
1231#define snd_pcm_proc_init()
1232#define snd_pcm_proc_done()
1233#endif /* CONFIG_SND_PROC_FS */
1234
1235
1236/*
1237 * ENTRY functions
1238 */
1239
1240static int __init alsa_pcm_init(void)
1241{
1242 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1243 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1244 snd_pcm_proc_init();
1245 return 0;
1246}
1247
1248static void __exit alsa_pcm_exit(void)
1249{
1250 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1251 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1252 snd_pcm_proc_done();
1253}
1254
1255module_init(alsa_pcm_init)
1256module_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/time.h>
25#include <linux/mutex.h>
26#include <sound/core.h>
27#include <sound/minors.h>
28#include <sound/pcm.h>
29#include <sound/control.h>
30#include <sound/info.h>
31
32MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34MODULE_LICENSE("GPL");
35
36static LIST_HEAD(snd_pcm_devices);
37static LIST_HEAD(snd_pcm_notify_list);
38static DEFINE_MUTEX(register_mutex);
39
40static int snd_pcm_free(struct snd_pcm *pcm);
41static int snd_pcm_dev_free(struct snd_device *device);
42static int snd_pcm_dev_register(struct snd_device *device);
43static int snd_pcm_dev_disconnect(struct snd_device *device);
44
45static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
46{
47 struct snd_pcm *pcm;
48
49 list_for_each_entry(pcm, &snd_pcm_devices, list) {
50 if (pcm->card == card && pcm->device == device)
51 return pcm;
52 }
53 return NULL;
54}
55
56static int snd_pcm_next(struct snd_card *card, int device)
57{
58 struct snd_pcm *pcm;
59
60 list_for_each_entry(pcm, &snd_pcm_devices, list) {
61 if (pcm->card == card && pcm->device > device)
62 return pcm->device;
63 else if (pcm->card->number > card->number)
64 return -1;
65 }
66 return -1;
67}
68
69static int snd_pcm_add(struct snd_pcm *newpcm)
70{
71 struct snd_pcm *pcm;
72
73 list_for_each_entry(pcm, &snd_pcm_devices, list) {
74 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
75 return -EBUSY;
76 if (pcm->card->number > newpcm->card->number ||
77 (pcm->card == newpcm->card &&
78 pcm->device > newpcm->device)) {
79 list_add(&newpcm->list, pcm->list.prev);
80 return 0;
81 }
82 }
83 list_add_tail(&newpcm->list, &snd_pcm_devices);
84 return 0;
85}
86
87static int snd_pcm_control_ioctl(struct snd_card *card,
88 struct snd_ctl_file *control,
89 unsigned int cmd, unsigned long arg)
90{
91 switch (cmd) {
92 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
93 {
94 int device;
95
96 if (get_user(device, (int __user *)arg))
97 return -EFAULT;
98 mutex_lock(®ister_mutex);
99 device = snd_pcm_next(card, device);
100 mutex_unlock(®ister_mutex);
101 if (put_user(device, (int __user *)arg))
102 return -EFAULT;
103 return 0;
104 }
105 case SNDRV_CTL_IOCTL_PCM_INFO:
106 {
107 struct snd_pcm_info __user *info;
108 unsigned int device, subdevice;
109 int stream;
110 struct snd_pcm *pcm;
111 struct snd_pcm_str *pstr;
112 struct snd_pcm_substream *substream;
113 int err;
114
115 info = (struct snd_pcm_info __user *)arg;
116 if (get_user(device, &info->device))
117 return -EFAULT;
118 if (get_user(stream, &info->stream))
119 return -EFAULT;
120 if (stream < 0 || stream > 1)
121 return -EINVAL;
122 if (get_user(subdevice, &info->subdevice))
123 return -EFAULT;
124 mutex_lock(®ister_mutex);
125 pcm = snd_pcm_get(card, device);
126 if (pcm == NULL) {
127 err = -ENXIO;
128 goto _error;
129 }
130 pstr = &pcm->streams[stream];
131 if (pstr->substream_count == 0) {
132 err = -ENOENT;
133 goto _error;
134 }
135 if (subdevice >= pstr->substream_count) {
136 err = -ENXIO;
137 goto _error;
138 }
139 for (substream = pstr->substream; substream;
140 substream = substream->next)
141 if (substream->number == (int)subdevice)
142 break;
143 if (substream == NULL) {
144 err = -ENXIO;
145 goto _error;
146 }
147 err = snd_pcm_info_user(substream, info);
148 _error:
149 mutex_unlock(®ister_mutex);
150 return err;
151 }
152 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
153 {
154 int val;
155
156 if (get_user(val, (int __user *)arg))
157 return -EFAULT;
158 control->prefer_pcm_subdevice = val;
159 return 0;
160 }
161 }
162 return -ENOIOCTLCMD;
163}
164
165#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
166
167static char *snd_pcm_format_names[] = {
168 FORMAT(S8),
169 FORMAT(U8),
170 FORMAT(S16_LE),
171 FORMAT(S16_BE),
172 FORMAT(U16_LE),
173 FORMAT(U16_BE),
174 FORMAT(S24_LE),
175 FORMAT(S24_BE),
176 FORMAT(U24_LE),
177 FORMAT(U24_BE),
178 FORMAT(S32_LE),
179 FORMAT(S32_BE),
180 FORMAT(U32_LE),
181 FORMAT(U32_BE),
182 FORMAT(FLOAT_LE),
183 FORMAT(FLOAT_BE),
184 FORMAT(FLOAT64_LE),
185 FORMAT(FLOAT64_BE),
186 FORMAT(IEC958_SUBFRAME_LE),
187 FORMAT(IEC958_SUBFRAME_BE),
188 FORMAT(MU_LAW),
189 FORMAT(A_LAW),
190 FORMAT(IMA_ADPCM),
191 FORMAT(MPEG),
192 FORMAT(GSM),
193 FORMAT(SPECIAL),
194 FORMAT(S24_3LE),
195 FORMAT(S24_3BE),
196 FORMAT(U24_3LE),
197 FORMAT(U24_3BE),
198 FORMAT(S20_3LE),
199 FORMAT(S20_3BE),
200 FORMAT(U20_3LE),
201 FORMAT(U20_3BE),
202 FORMAT(S18_3LE),
203 FORMAT(S18_3BE),
204 FORMAT(U18_3LE),
205 FORMAT(U18_3BE),
206 FORMAT(G723_24),
207 FORMAT(G723_24_1B),
208 FORMAT(G723_40),
209 FORMAT(G723_40_1B),
210};
211
212const char *snd_pcm_format_name(snd_pcm_format_t format)
213{
214 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
215 return "Unknown";
216 return snd_pcm_format_names[(__force unsigned int)format];
217}
218EXPORT_SYMBOL_GPL(snd_pcm_format_name);
219
220#ifdef CONFIG_SND_VERBOSE_PROCFS
221
222#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
223#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
224#define READY(v) [SNDRV_PCM_READY_##v] = #v
225#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
226#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
227#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
228#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
229#define START(v) [SNDRV_PCM_START_##v] = #v
230#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
231
232static char *snd_pcm_stream_names[] = {
233 STREAM(PLAYBACK),
234 STREAM(CAPTURE),
235};
236
237static char *snd_pcm_state_names[] = {
238 STATE(OPEN),
239 STATE(SETUP),
240 STATE(PREPARED),
241 STATE(RUNNING),
242 STATE(XRUN),
243 STATE(DRAINING),
244 STATE(PAUSED),
245 STATE(SUSPENDED),
246};
247
248static char *snd_pcm_access_names[] = {
249 ACCESS(MMAP_INTERLEAVED),
250 ACCESS(MMAP_NONINTERLEAVED),
251 ACCESS(MMAP_COMPLEX),
252 ACCESS(RW_INTERLEAVED),
253 ACCESS(RW_NONINTERLEAVED),
254};
255
256static char *snd_pcm_subformat_names[] = {
257 SUBFORMAT(STD),
258};
259
260static char *snd_pcm_tstamp_mode_names[] = {
261 TSTAMP(NONE),
262 TSTAMP(ENABLE),
263};
264
265static const char *snd_pcm_stream_name(int stream)
266{
267 return snd_pcm_stream_names[stream];
268}
269
270static const char *snd_pcm_access_name(snd_pcm_access_t access)
271{
272 return snd_pcm_access_names[(__force int)access];
273}
274
275static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
276{
277 return snd_pcm_subformat_names[(__force int)subformat];
278}
279
280static const char *snd_pcm_tstamp_mode_name(int mode)
281{
282 return snd_pcm_tstamp_mode_names[mode];
283}
284
285static const char *snd_pcm_state_name(snd_pcm_state_t state)
286{
287 return snd_pcm_state_names[(__force int)state];
288}
289
290#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
291#include <linux/soundcard.h>
292
293static const char *snd_pcm_oss_format_name(int format)
294{
295 switch (format) {
296 case AFMT_MU_LAW:
297 return "MU_LAW";
298 case AFMT_A_LAW:
299 return "A_LAW";
300 case AFMT_IMA_ADPCM:
301 return "IMA_ADPCM";
302 case AFMT_U8:
303 return "U8";
304 case AFMT_S16_LE:
305 return "S16_LE";
306 case AFMT_S16_BE:
307 return "S16_BE";
308 case AFMT_S8:
309 return "S8";
310 case AFMT_U16_LE:
311 return "U16_LE";
312 case AFMT_U16_BE:
313 return "U16_BE";
314 case AFMT_MPEG:
315 return "MPEG";
316 default:
317 return "unknown";
318 }
319}
320#endif
321
322static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
323 struct snd_info_buffer *buffer)
324{
325 struct snd_pcm_info *info;
326 int err;
327
328 if (! substream)
329 return;
330
331 info = kmalloc(sizeof(*info), GFP_KERNEL);
332 if (! info) {
333 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
334 return;
335 }
336
337 err = snd_pcm_info(substream, info);
338 if (err < 0) {
339 snd_iprintf(buffer, "error %d\n", err);
340 kfree(info);
341 return;
342 }
343 snd_iprintf(buffer, "card: %d\n", info->card);
344 snd_iprintf(buffer, "device: %d\n", info->device);
345 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
346 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
347 snd_iprintf(buffer, "id: %s\n", info->id);
348 snd_iprintf(buffer, "name: %s\n", info->name);
349 snd_iprintf(buffer, "subname: %s\n", info->subname);
350 snd_iprintf(buffer, "class: %d\n", info->dev_class);
351 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
352 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
353 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
354 kfree(info);
355}
356
357static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
358 struct snd_info_buffer *buffer)
359{
360 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
361 buffer);
362}
363
364static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
365 struct snd_info_buffer *buffer)
366{
367 snd_pcm_proc_info_read(entry->private_data, buffer);
368}
369
370static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
371 struct snd_info_buffer *buffer)
372{
373 struct snd_pcm_substream *substream = entry->private_data;
374 struct snd_pcm_runtime *runtime;
375
376 mutex_lock(&substream->pcm->open_mutex);
377 runtime = substream->runtime;
378 if (!runtime) {
379 snd_iprintf(buffer, "closed\n");
380 goto unlock;
381 }
382 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
383 snd_iprintf(buffer, "no setup\n");
384 goto unlock;
385 }
386 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
387 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
388 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
389 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
390 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
391 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
392 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
393#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394 if (substream->oss.oss) {
395 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
396 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
397 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
398 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
399 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
400 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
401 }
402#endif
403 unlock:
404 mutex_unlock(&substream->pcm->open_mutex);
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 mutex_lock(&substream->pcm->open_mutex);
414 runtime = substream->runtime;
415 if (!runtime) {
416 snd_iprintf(buffer, "closed\n");
417 goto unlock;
418 }
419 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
420 snd_iprintf(buffer, "no setup\n");
421 goto unlock;
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 unlock:
432 mutex_unlock(&substream->pcm->open_mutex);
433}
434
435static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
436 struct snd_info_buffer *buffer)
437{
438 struct snd_pcm_substream *substream = entry->private_data;
439 struct snd_pcm_runtime *runtime;
440 struct snd_pcm_status status;
441 int err;
442
443 mutex_lock(&substream->pcm->open_mutex);
444 runtime = substream->runtime;
445 if (!runtime) {
446 snd_iprintf(buffer, "closed\n");
447 goto unlock;
448 }
449 memset(&status, 0, sizeof(status));
450 err = snd_pcm_status(substream, &status);
451 if (err < 0) {
452 snd_iprintf(buffer, "error %d\n", err);
453 goto unlock;
454 }
455 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
456 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
457 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
458 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
459 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
460 status.tstamp.tv_sec, status.tstamp.tv_nsec);
461 snd_iprintf(buffer, "delay : %ld\n", status.delay);
462 snd_iprintf(buffer, "avail : %ld\n", status.avail);
463 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
464 snd_iprintf(buffer, "-----\n");
465 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
466 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
467 unlock:
468 mutex_unlock(&substream->pcm->open_mutex);
469}
470
471#ifdef CONFIG_SND_PCM_XRUN_DEBUG
472static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
473 struct snd_info_buffer *buffer)
474{
475 struct snd_pcm_str *pstr = entry->private_data;
476 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
477}
478
479static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
480 struct snd_info_buffer *buffer)
481{
482 struct snd_pcm_str *pstr = entry->private_data;
483 char line[64];
484 if (!snd_info_get_line(buffer, line, sizeof(line)))
485 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
486}
487#endif
488
489static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
490{
491 struct snd_pcm *pcm = pstr->pcm;
492 struct snd_info_entry *entry;
493 char name[16];
494
495 sprintf(name, "pcm%i%c", pcm->device,
496 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
497 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
498 return -ENOMEM;
499 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
500 if (snd_info_register(entry) < 0) {
501 snd_info_free_entry(entry);
502 return -ENOMEM;
503 }
504 pstr->proc_root = entry;
505
506 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
507 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
508 if (snd_info_register(entry) < 0) {
509 snd_info_free_entry(entry);
510 entry = NULL;
511 }
512 }
513 pstr->proc_info_entry = entry;
514
515#ifdef CONFIG_SND_PCM_XRUN_DEBUG
516 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
517 pstr->proc_root)) != NULL) {
518 entry->c.text.read = snd_pcm_xrun_debug_read;
519 entry->c.text.write = snd_pcm_xrun_debug_write;
520 entry->mode |= S_IWUSR;
521 entry->private_data = pstr;
522 if (snd_info_register(entry) < 0) {
523 snd_info_free_entry(entry);
524 entry = NULL;
525 }
526 }
527 pstr->proc_xrun_debug_entry = entry;
528#endif
529 return 0;
530}
531
532static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
533{
534#ifdef CONFIG_SND_PCM_XRUN_DEBUG
535 snd_info_free_entry(pstr->proc_xrun_debug_entry);
536 pstr->proc_xrun_debug_entry = NULL;
537#endif
538 snd_info_free_entry(pstr->proc_info_entry);
539 pstr->proc_info_entry = NULL;
540 snd_info_free_entry(pstr->proc_root);
541 pstr->proc_root = NULL;
542 return 0;
543}
544
545static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
546{
547 struct snd_info_entry *entry;
548 struct snd_card *card;
549 char name[16];
550
551 card = substream->pcm->card;
552
553 sprintf(name, "sub%i", substream->number);
554 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
555 return -ENOMEM;
556 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
557 if (snd_info_register(entry) < 0) {
558 snd_info_free_entry(entry);
559 return -ENOMEM;
560 }
561 substream->proc_root = entry;
562
563 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
564 snd_info_set_text_ops(entry, substream,
565 snd_pcm_substream_proc_info_read);
566 if (snd_info_register(entry) < 0) {
567 snd_info_free_entry(entry);
568 entry = NULL;
569 }
570 }
571 substream->proc_info_entry = entry;
572
573 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
574 snd_info_set_text_ops(entry, substream,
575 snd_pcm_substream_proc_hw_params_read);
576 if (snd_info_register(entry) < 0) {
577 snd_info_free_entry(entry);
578 entry = NULL;
579 }
580 }
581 substream->proc_hw_params_entry = entry;
582
583 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
584 snd_info_set_text_ops(entry, substream,
585 snd_pcm_substream_proc_sw_params_read);
586 if (snd_info_register(entry) < 0) {
587 snd_info_free_entry(entry);
588 entry = NULL;
589 }
590 }
591 substream->proc_sw_params_entry = entry;
592
593 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
594 snd_info_set_text_ops(entry, substream,
595 snd_pcm_substream_proc_status_read);
596 if (snd_info_register(entry) < 0) {
597 snd_info_free_entry(entry);
598 entry = NULL;
599 }
600 }
601 substream->proc_status_entry = entry;
602
603 return 0;
604}
605
606static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
607{
608 snd_info_free_entry(substream->proc_info_entry);
609 substream->proc_info_entry = NULL;
610 snd_info_free_entry(substream->proc_hw_params_entry);
611 substream->proc_hw_params_entry = NULL;
612 snd_info_free_entry(substream->proc_sw_params_entry);
613 substream->proc_sw_params_entry = NULL;
614 snd_info_free_entry(substream->proc_status_entry);
615 substream->proc_status_entry = NULL;
616 snd_info_free_entry(substream->proc_root);
617 substream->proc_root = NULL;
618 return 0;
619}
620#else /* !CONFIG_SND_VERBOSE_PROCFS */
621static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
622static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
623static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
624static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
625#endif /* CONFIG_SND_VERBOSE_PROCFS */
626
627/**
628 * snd_pcm_new_stream - create a new PCM stream
629 * @pcm: the pcm instance
630 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
631 * @substream_count: the number of substreams
632 *
633 * Creates a new stream for the pcm.
634 * The corresponding stream on the pcm must have been empty before
635 * calling this, i.e. zero must be given to the argument of
636 * snd_pcm_new().
637 *
638 * Returns zero if successful, or a negative error code on failure.
639 */
640int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
641{
642 int idx, err;
643 struct snd_pcm_str *pstr = &pcm->streams[stream];
644 struct snd_pcm_substream *substream, *prev;
645
646#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
647 mutex_init(&pstr->oss.setup_mutex);
648#endif
649 pstr->stream = stream;
650 pstr->pcm = pcm;
651 pstr->substream_count = substream_count;
652 if (substream_count > 0) {
653 err = snd_pcm_stream_proc_init(pstr);
654 if (err < 0) {
655 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
656 return err;
657 }
658 }
659 prev = NULL;
660 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
661 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
662 if (substream == NULL) {
663 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
664 return -ENOMEM;
665 }
666 substream->pcm = pcm;
667 substream->pstr = pstr;
668 substream->number = idx;
669 substream->stream = stream;
670 sprintf(substream->name, "subdevice #%i", idx);
671 substream->buffer_bytes_max = UINT_MAX;
672 if (prev == NULL)
673 pstr->substream = substream;
674 else
675 prev->next = substream;
676 err = snd_pcm_substream_proc_init(substream);
677 if (err < 0) {
678 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
679 if (prev == NULL)
680 pstr->substream = NULL;
681 else
682 prev->next = NULL;
683 kfree(substream);
684 return err;
685 }
686 substream->group = &substream->self_group;
687 spin_lock_init(&substream->self_group.lock);
688 INIT_LIST_HEAD(&substream->self_group.substreams);
689 list_add_tail(&substream->link_list, &substream->self_group.substreams);
690 atomic_set(&substream->mmap_count, 0);
691 prev = substream;
692 }
693 return 0;
694}
695
696EXPORT_SYMBOL(snd_pcm_new_stream);
697
698/**
699 * snd_pcm_new - create a new PCM instance
700 * @card: the card instance
701 * @id: the id string
702 * @device: the device index (zero based)
703 * @playback_count: the number of substreams for playback
704 * @capture_count: the number of substreams for capture
705 * @rpcm: the pointer to store the new pcm instance
706 *
707 * Creates a new PCM instance.
708 *
709 * The pcm operators have to be set afterwards to the new instance
710 * via snd_pcm_set_ops().
711 *
712 * Returns zero if successful, or a negative error code on failure.
713 */
714int snd_pcm_new(struct snd_card *card, const char *id, int device,
715 int playback_count, int capture_count,
716 struct snd_pcm ** rpcm)
717{
718 struct snd_pcm *pcm;
719 int err;
720 static struct snd_device_ops ops = {
721 .dev_free = snd_pcm_dev_free,
722 .dev_register = snd_pcm_dev_register,
723 .dev_disconnect = snd_pcm_dev_disconnect,
724 };
725
726 if (snd_BUG_ON(!card))
727 return -ENXIO;
728 if (rpcm)
729 *rpcm = NULL;
730 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
731 if (pcm == NULL) {
732 snd_printk(KERN_ERR "Cannot allocate PCM\n");
733 return -ENOMEM;
734 }
735 pcm->card = card;
736 pcm->device = device;
737 if (id)
738 strlcpy(pcm->id, id, sizeof(pcm->id));
739 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
740 snd_pcm_free(pcm);
741 return err;
742 }
743 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
744 snd_pcm_free(pcm);
745 return err;
746 }
747 mutex_init(&pcm->open_mutex);
748 init_waitqueue_head(&pcm->open_wait);
749 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
750 snd_pcm_free(pcm);
751 return err;
752 }
753 if (rpcm)
754 *rpcm = pcm;
755 return 0;
756}
757
758EXPORT_SYMBOL(snd_pcm_new);
759
760static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
761{
762 struct snd_pcm_substream *substream, *substream_next;
763#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
764 struct snd_pcm_oss_setup *setup, *setupn;
765#endif
766 substream = pstr->substream;
767 while (substream) {
768 substream_next = substream->next;
769 snd_pcm_timer_done(substream);
770 snd_pcm_substream_proc_done(substream);
771 kfree(substream);
772 substream = substream_next;
773 }
774 snd_pcm_stream_proc_done(pstr);
775#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
776 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
777 setupn = setup->next;
778 kfree(setup->task_name);
779 kfree(setup);
780 }
781#endif
782}
783
784static int snd_pcm_free(struct snd_pcm *pcm)
785{
786 struct snd_pcm_notify *notify;
787
788 if (!pcm)
789 return 0;
790 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
791 notify->n_unregister(pcm);
792 }
793 if (pcm->private_free)
794 pcm->private_free(pcm);
795 snd_pcm_lib_preallocate_free_for_all(pcm);
796 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
797 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
798 kfree(pcm);
799 return 0;
800}
801
802static int snd_pcm_dev_free(struct snd_device *device)
803{
804 struct snd_pcm *pcm = device->device_data;
805 return snd_pcm_free(pcm);
806}
807
808int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
809 struct file *file,
810 struct snd_pcm_substream **rsubstream)
811{
812 struct snd_pcm_str * pstr;
813 struct snd_pcm_substream *substream;
814 struct snd_pcm_runtime *runtime;
815 struct snd_ctl_file *kctl;
816 struct snd_card *card;
817 int prefer_subdevice = -1;
818 size_t size;
819
820 if (snd_BUG_ON(!pcm || !rsubstream))
821 return -ENXIO;
822 *rsubstream = NULL;
823 pstr = &pcm->streams[stream];
824 if (pstr->substream == NULL || pstr->substream_count == 0)
825 return -ENODEV;
826
827 card = pcm->card;
828 read_lock(&card->ctl_files_rwlock);
829 list_for_each_entry(kctl, &card->ctl_files, list) {
830 if (kctl->pid == task_pid(current)) {
831 prefer_subdevice = kctl->prefer_pcm_subdevice;
832 if (prefer_subdevice != -1)
833 break;
834 }
835 }
836 read_unlock(&card->ctl_files_rwlock);
837
838 switch (stream) {
839 case SNDRV_PCM_STREAM_PLAYBACK:
840 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
841 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
842 if (SUBSTREAM_BUSY(substream))
843 return -EAGAIN;
844 }
845 }
846 break;
847 case SNDRV_PCM_STREAM_CAPTURE:
848 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
849 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
850 if (SUBSTREAM_BUSY(substream))
851 return -EAGAIN;
852 }
853 }
854 break;
855 default:
856 return -EINVAL;
857 }
858
859 if (file->f_flags & O_APPEND) {
860 if (prefer_subdevice < 0) {
861 if (pstr->substream_count > 1)
862 return -EINVAL; /* must be unique */
863 substream = pstr->substream;
864 } else {
865 for (substream = pstr->substream; substream;
866 substream = substream->next)
867 if (substream->number == prefer_subdevice)
868 break;
869 }
870 if (! substream)
871 return -ENODEV;
872 if (! SUBSTREAM_BUSY(substream))
873 return -EBADFD;
874 substream->ref_count++;
875 *rsubstream = substream;
876 return 0;
877 }
878
879 if (prefer_subdevice >= 0) {
880 for (substream = pstr->substream; substream; substream = substream->next)
881 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
882 goto __ok;
883 }
884 for (substream = pstr->substream; substream; substream = substream->next)
885 if (!SUBSTREAM_BUSY(substream))
886 break;
887 __ok:
888 if (substream == NULL)
889 return -EAGAIN;
890
891 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
892 if (runtime == NULL)
893 return -ENOMEM;
894
895 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
896 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
897 if (runtime->status == NULL) {
898 kfree(runtime);
899 return -ENOMEM;
900 }
901 memset((void*)runtime->status, 0, size);
902
903 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
904 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
905 if (runtime->control == NULL) {
906 snd_free_pages((void*)runtime->status,
907 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
908 kfree(runtime);
909 return -ENOMEM;
910 }
911 memset((void*)runtime->control, 0, size);
912
913 init_waitqueue_head(&runtime->sleep);
914 init_waitqueue_head(&runtime->tsleep);
915
916 runtime->status->state = SNDRV_PCM_STATE_OPEN;
917
918 substream->runtime = runtime;
919 substream->private_data = pcm->private_data;
920 substream->ref_count = 1;
921 substream->f_flags = file->f_flags;
922 substream->pid = get_pid(task_pid(current));
923 pstr->substream_opened++;
924 *rsubstream = substream;
925 return 0;
926}
927
928void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
929{
930 struct snd_pcm_runtime *runtime;
931
932 if (PCM_RUNTIME_CHECK(substream))
933 return;
934 runtime = substream->runtime;
935 if (runtime->private_free != NULL)
936 runtime->private_free(runtime);
937 snd_free_pages((void*)runtime->status,
938 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
939 snd_free_pages((void*)runtime->control,
940 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
941 kfree(runtime->hw_constraints.rules);
942#ifdef CONFIG_SND_PCM_XRUN_DEBUG
943 if (runtime->hwptr_log)
944 kfree(runtime->hwptr_log);
945#endif
946 kfree(runtime);
947 substream->runtime = NULL;
948 put_pid(substream->pid);
949 substream->pid = NULL;
950 substream->pstr->substream_opened--;
951}
952
953static ssize_t show_pcm_class(struct device *dev,
954 struct device_attribute *attr, char *buf)
955{
956 struct snd_pcm *pcm;
957 const char *str;
958 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
959 [SNDRV_PCM_CLASS_GENERIC] = "generic",
960 [SNDRV_PCM_CLASS_MULTI] = "multi",
961 [SNDRV_PCM_CLASS_MODEM] = "modem",
962 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
963 };
964
965 if (! (pcm = dev_get_drvdata(dev)) ||
966 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
967 str = "none";
968 else
969 str = strs[pcm->dev_class];
970 return snprintf(buf, PAGE_SIZE, "%s\n", str);
971}
972
973static struct device_attribute pcm_attrs =
974 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
975
976static int snd_pcm_dev_register(struct snd_device *device)
977{
978 int cidx, err;
979 struct snd_pcm_substream *substream;
980 struct snd_pcm_notify *notify;
981 char str[16];
982 struct snd_pcm *pcm;
983 struct device *dev;
984
985 if (snd_BUG_ON(!device || !device->device_data))
986 return -ENXIO;
987 pcm = device->device_data;
988 mutex_lock(®ister_mutex);
989 err = snd_pcm_add(pcm);
990 if (err) {
991 mutex_unlock(®ister_mutex);
992 return err;
993 }
994 for (cidx = 0; cidx < 2; cidx++) {
995 int devtype = -1;
996 if (pcm->streams[cidx].substream == NULL)
997 continue;
998 switch (cidx) {
999 case SNDRV_PCM_STREAM_PLAYBACK:
1000 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1001 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1002 break;
1003 case SNDRV_PCM_STREAM_CAPTURE:
1004 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1005 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1006 break;
1007 }
1008 /* device pointer to use, pcm->dev takes precedence if
1009 * it is assigned, otherwise fall back to card's device
1010 * if possible */
1011 dev = pcm->dev;
1012 if (!dev)
1013 dev = snd_card_get_device_link(pcm->card);
1014 /* register pcm */
1015 err = snd_register_device_for_dev(devtype, pcm->card,
1016 pcm->device,
1017 &snd_pcm_f_ops[cidx],
1018 pcm, str, dev);
1019 if (err < 0) {
1020 list_del(&pcm->list);
1021 mutex_unlock(®ister_mutex);
1022 return err;
1023 }
1024 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1025 &pcm_attrs);
1026 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1027 snd_pcm_timer_init(substream);
1028 }
1029
1030 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1031 notify->n_register(pcm);
1032
1033 mutex_unlock(®ister_mutex);
1034 return 0;
1035}
1036
1037static int snd_pcm_dev_disconnect(struct snd_device *device)
1038{
1039 struct snd_pcm *pcm = device->device_data;
1040 struct snd_pcm_notify *notify;
1041 struct snd_pcm_substream *substream;
1042 int cidx, devtype;
1043
1044 mutex_lock(®ister_mutex);
1045 if (list_empty(&pcm->list))
1046 goto unlock;
1047
1048 list_del_init(&pcm->list);
1049 for (cidx = 0; cidx < 2; cidx++)
1050 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1051 if (substream->runtime)
1052 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1053 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1054 notify->n_disconnect(pcm);
1055 }
1056 for (cidx = 0; cidx < 2; cidx++) {
1057 devtype = -1;
1058 switch (cidx) {
1059 case SNDRV_PCM_STREAM_PLAYBACK:
1060 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1061 break;
1062 case SNDRV_PCM_STREAM_CAPTURE:
1063 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1064 break;
1065 }
1066 snd_unregister_device(devtype, pcm->card, pcm->device);
1067 }
1068 unlock:
1069 mutex_unlock(®ister_mutex);
1070 return 0;
1071}
1072
1073int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1074{
1075 struct snd_pcm *pcm;
1076
1077 if (snd_BUG_ON(!notify ||
1078 !notify->n_register ||
1079 !notify->n_unregister ||
1080 !notify->n_disconnect))
1081 return -EINVAL;
1082 mutex_lock(®ister_mutex);
1083 if (nfree) {
1084 list_del(¬ify->list);
1085 list_for_each_entry(pcm, &snd_pcm_devices, list)
1086 notify->n_unregister(pcm);
1087 } else {
1088 list_add_tail(¬ify->list, &snd_pcm_notify_list);
1089 list_for_each_entry(pcm, &snd_pcm_devices, list)
1090 notify->n_register(pcm);
1091 }
1092 mutex_unlock(®ister_mutex);
1093 return 0;
1094}
1095
1096EXPORT_SYMBOL(snd_pcm_notify);
1097
1098#ifdef CONFIG_PROC_FS
1099/*
1100 * Info interface
1101 */
1102
1103static void snd_pcm_proc_read(struct snd_info_entry *entry,
1104 struct snd_info_buffer *buffer)
1105{
1106 struct snd_pcm *pcm;
1107
1108 mutex_lock(®ister_mutex);
1109 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1110 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1111 pcm->card->number, pcm->device, pcm->id, pcm->name);
1112 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1113 snd_iprintf(buffer, " : playback %i",
1114 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1115 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1116 snd_iprintf(buffer, " : capture %i",
1117 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1118 snd_iprintf(buffer, "\n");
1119 }
1120 mutex_unlock(®ister_mutex);
1121}
1122
1123static struct snd_info_entry *snd_pcm_proc_entry;
1124
1125static void snd_pcm_proc_init(void)
1126{
1127 struct snd_info_entry *entry;
1128
1129 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1130 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1131 if (snd_info_register(entry) < 0) {
1132 snd_info_free_entry(entry);
1133 entry = NULL;
1134 }
1135 }
1136 snd_pcm_proc_entry = entry;
1137}
1138
1139static void snd_pcm_proc_done(void)
1140{
1141 snd_info_free_entry(snd_pcm_proc_entry);
1142}
1143
1144#else /* !CONFIG_PROC_FS */
1145#define snd_pcm_proc_init()
1146#define snd_pcm_proc_done()
1147#endif /* CONFIG_PROC_FS */
1148
1149
1150/*
1151 * ENTRY functions
1152 */
1153
1154static int __init alsa_pcm_init(void)
1155{
1156 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1157 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1158 snd_pcm_proc_init();
1159 return 0;
1160}
1161
1162static void __exit alsa_pcm_exit(void)
1163{
1164 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1165 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1166 snd_pcm_proc_done();
1167}
1168
1169module_init(alsa_pcm_init)
1170module_exit(alsa_pcm_exit)