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