1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.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
32 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34 MODULE_LICENSE("GPL");
35
36 snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
37 static LIST_HEAD(snd_pcm_notify_list);
38 static DECLARE_MUTEX(register_mutex);
39
40 static int snd_pcm_free(snd_pcm_t *pcm);
41 static int snd_pcm_dev_free(snd_device_t *device);
42 static int snd_pcm_dev_register(snd_device_t *device);
43 static int snd_pcm_dev_disconnect(snd_device_t *device);
44 static int snd_pcm_dev_unregister(snd_device_t *device);
45
46 static int snd_pcm_control_ioctl(snd_card_t * card,
47 snd_ctl_file_t * control,
48 unsigned int cmd, unsigned long arg)
49 {
50 unsigned int tmp;
51
52 tmp = card->number * SNDRV_PCM_DEVICES;
53 switch (cmd) {
54 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
55 {
56 int device;
57
58 if (get_user(device, (int __user *)arg))
59 return -EFAULT;
60 device = device < 0 ? 0 : device + 1;
61 while (device < SNDRV_PCM_DEVICES) {
62 if (snd_pcm_devices[tmp + device])
63 break;
64 device++;
65 }
66 if (device == SNDRV_PCM_DEVICES)
67 device = -1;
68 if (put_user(device, (int __user *)arg))
69 return -EFAULT;
70 return 0;
71 }
72 case SNDRV_CTL_IOCTL_PCM_INFO:
73 {
74 snd_pcm_info_t __user *info;
75 unsigned int device, subdevice;
76 snd_pcm_stream_t stream;
77 snd_pcm_t *pcm;
78 snd_pcm_str_t *pstr;
79 snd_pcm_substream_t *substream;
80 info = (snd_pcm_info_t __user *)arg;
81 if (get_user(device, &info->device))
82 return -EFAULT;
83 if (device >= SNDRV_PCM_DEVICES)
84 return -ENXIO;
85 pcm = snd_pcm_devices[tmp + device];
86 if (pcm == NULL)
87 return -ENXIO;
88 if (get_user(stream, &info->stream))
89 return -EFAULT;
90 if (stream < 0 || stream > 1)
91 return -EINVAL;
92 pstr = &pcm->streams[stream];
93 if (pstr->substream_count == 0)
94 return -ENOENT;
95 if (get_user(subdevice, &info->subdevice))
96 return -EFAULT;
97 if (subdevice >= pstr->substream_count)
98 return -ENXIO;
99 for (substream = pstr->substream; substream; substream = substream->next)
100 if (substream->number == (int)subdevice)
101 break;
102 if (substream == NULL)
103 return -ENXIO;
104 return snd_pcm_info_user(substream, info);
105 }
106 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
107 {
108 int val;
109
110 if (get_user(val, (int __user *)arg))
111 return -EFAULT;
112 control->prefer_pcm_subdevice = val;
113 return 0;
114 }
115 }
116 return -ENOIOCTLCMD;
117 }
118 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
119 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
120 #define READY(v) [SNDRV_PCM_READY_##v] = #v
121 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
122 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
123 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
124 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
125 #define START(v) [SNDRV_PCM_START_##v] = #v
126 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
127 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
128
129 static char *snd_pcm_stream_names[] = {
130 STREAM(PLAYBACK),
131 STREAM(CAPTURE),
132 };
133
134 static char *snd_pcm_state_names[] = {
135 STATE(OPEN),
136 STATE(SETUP),
137 STATE(PREPARED),
138 STATE(RUNNING),
139 STATE(XRUN),
140 STATE(DRAINING),
141 STATE(PAUSED),
142 STATE(SUSPENDED),
143 };
144
145 static char *snd_pcm_access_names[] = {
146 ACCESS(MMAP_INTERLEAVED),
147 ACCESS(MMAP_NONINTERLEAVED),
148 ACCESS(MMAP_COMPLEX),
149 ACCESS(RW_INTERLEAVED),
150 ACCESS(RW_NONINTERLEAVED),
151 };
152
153 static char *snd_pcm_format_names[] = {
154 FORMAT(S8),
155 FORMAT(U8),
156 FORMAT(S16_LE),
157 FORMAT(S16_BE),
158 FORMAT(U16_LE),
159 FORMAT(U16_BE),
160 FORMAT(S24_LE),
161 FORMAT(S24_BE),
162 FORMAT(U24_LE),
163 FORMAT(U24_BE),
164 FORMAT(S32_LE),
165 FORMAT(S32_BE),
166 FORMAT(U32_LE),
167 FORMAT(U32_BE),
168 FORMAT(FLOAT_LE),
169 FORMAT(FLOAT_BE),
170 FORMAT(FLOAT64_LE),
171 FORMAT(FLOAT64_BE),
172 FORMAT(IEC958_SUBFRAME_LE),
173 FORMAT(IEC958_SUBFRAME_BE),
174 FORMAT(MU_LAW),
175 FORMAT(A_LAW),
176 FORMAT(IMA_ADPCM),
177 FORMAT(MPEG),
178 FORMAT(GSM),
179 FORMAT(SPECIAL),
180 FORMAT(S24_3LE),
181 FORMAT(S24_3BE),
182 FORMAT(U24_3LE),
183 FORMAT(U24_3BE),
184 FORMAT(S20_3LE),
185 FORMAT(S20_3BE),
186 FORMAT(U20_3LE),
187 FORMAT(U20_3BE),
188 FORMAT(S18_3LE),
189 FORMAT(S18_3BE),
190 FORMAT(U18_3LE),
191 FORMAT(U18_3BE),
192 };
193
194 static char *snd_pcm_subformat_names[] = {
195 SUBFORMAT(STD),
196 };
197
198 static char *snd_pcm_tstamp_mode_names[] = {
199 TSTAMP(NONE),
200 TSTAMP(MMAP),
201 };
202
203 static const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
204 {
205 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
206 return snd_pcm_stream_names[stream];
207 }
208
209 static const char *snd_pcm_access_name(snd_pcm_access_t access)
210 {
211 snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL);
212 return snd_pcm_access_names[access];
213 }
214
215 const char *snd_pcm_format_name(snd_pcm_format_t format)
216 {
217 snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL);
218 return snd_pcm_format_names[format];
219 }
220
221 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
222 {
223 snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL);
224 return snd_pcm_subformat_names[subformat];
225 }
226
227 static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
228 {
229 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
230 return snd_pcm_tstamp_mode_names[mode];
231 }
232
233 static const char *snd_pcm_state_name(snd_pcm_state_t state)
234 {
235 snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL);
236 return snd_pcm_state_names[state];
237 }
238
239 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
240 #include <linux/soundcard.h>
241 static const char *snd_pcm_oss_format_name(int format)
242 {
243 switch (format) {
244 case AFMT_MU_LAW:
245 return "MU_LAW";
246 case AFMT_A_LAW:
247 return "A_LAW";
248 case AFMT_IMA_ADPCM:
249 return "IMA_ADPCM";
250 case AFMT_U8:
251 return "U8";
252 case AFMT_S16_LE:
253 return "S16_LE";
254 case AFMT_S16_BE:
255 return "S16_BE";
256 case AFMT_S8:
257 return "S8";
258 case AFMT_U16_LE:
259 return "U16_LE";
260 case AFMT_U16_BE:
261 return "U16_BE";
262 case AFMT_MPEG:
263 return "MPEG";
264 default:
265 return "unknown";
266 }
267 }
268 #endif
269
270 #ifdef CONFIG_PROC_FS
271 static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer)
272 {
273 snd_pcm_info_t info;
274 int err;
275 snd_runtime_check(substream, return);
276 err = snd_pcm_info(substream, &info);
277 if (err < 0) {
278 snd_iprintf(buffer, "error %d\n", err);
279 return;
280 }
281 snd_iprintf(buffer, "card: %d\n", info.card);
282 snd_iprintf(buffer, "device: %d\n", info.device);
283 snd_iprintf(buffer, "subdevice: %d\n", info.subdevice);
284 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info.stream));
285 snd_iprintf(buffer, "id: %s\n", info.id);
286 snd_iprintf(buffer, "name: %s\n", info.name);
287 snd_iprintf(buffer, "subname: %s\n", info.subname);
288 snd_iprintf(buffer, "class: %d\n", info.dev_class);
289 snd_iprintf(buffer, "subclass: %d\n", info.dev_subclass);
290 snd_iprintf(buffer, "subdevices_count: %d\n", info.subdevices_count);
291 snd_iprintf(buffer, "subdevices_avail: %d\n", info.subdevices_avail);
292 }
293
294 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
295 {
296 snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
297 }
298
299 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
300 {
301 snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
302 }
303
304 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
305 {
306 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
307 snd_pcm_runtime_t *runtime = substream->runtime;
308 if (!runtime) {
309 snd_iprintf(buffer, "closed\n");
310 return;
311 }
312 snd_pcm_stream_lock_irq(substream);
313 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
314 snd_iprintf(buffer, "no setup\n");
315 snd_pcm_stream_unlock_irq(substream);
316 return;
317 }
318 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
319 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
320 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
321 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
322 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
323 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
324 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
325 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
326 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
327 if (substream->oss.oss) {
328 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
329 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
330 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
331 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
332 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
333 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
334 }
335 #endif
336 snd_pcm_stream_unlock_irq(substream);
337 }
338
339 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
340 {
341 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
342 snd_pcm_runtime_t *runtime = substream->runtime;
343 if (!runtime) {
344 snd_iprintf(buffer, "closed\n");
345 return;
346 }
347 snd_pcm_stream_lock_irq(substream);
348 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
349 snd_iprintf(buffer, "no setup\n");
350 snd_pcm_stream_unlock_irq(substream);
351 return;
352 }
353 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
354 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
355 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
356 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
357 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
358 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
359 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
360 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
361 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
362 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
363 snd_pcm_stream_unlock_irq(substream);
364 }
365
366 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
367 {
368 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
369 snd_pcm_runtime_t *runtime = substream->runtime;
370 snd_pcm_status_t status;
371 int err;
372 if (!runtime) {
373 snd_iprintf(buffer, "closed\n");
374 return;
375 }
376 memset(&status, 0, sizeof(status));
377 err = snd_pcm_status(substream, &status);
378 if (err < 0) {
379 snd_iprintf(buffer, "error %d\n", err);
380 return;
381 }
382 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
383 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
384 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
385 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
386 status.tstamp.tv_sec, status.tstamp.tv_nsec);
387 snd_iprintf(buffer, "delay : %ld\n", status.delay);
388 snd_iprintf(buffer, "avail : %ld\n", status.avail);
389 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
390 snd_iprintf(buffer, "-----\n");
391 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
392 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
393 }
394 #endif
395
396 #ifdef CONFIG_SND_DEBUG
397 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
398 {
399 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
400 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
401 }
402
403 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
404 {
405 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
406 char line[64];
407 if (!snd_info_get_line(buffer, line, sizeof(line)))
408 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
409 }
410 #endif
411
412 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
413 {
414 snd_pcm_t *pcm = pstr->pcm;
415 snd_info_entry_t *entry;
416 char name[16];
417
418 sprintf(name, "pcm%i%c", pcm->device,
419 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
420 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
421 return -ENOMEM;
422 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
423 if (snd_info_register(entry) < 0) {
424 snd_info_free_entry(entry);
425 return -ENOMEM;
426 }
427 pstr->proc_root = entry;
428
429 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
430 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
431 if (snd_info_register(entry) < 0) {
432 snd_info_free_entry(entry);
433 entry = NULL;
434 }
435 }
436 pstr->proc_info_entry = entry;
437
438 #ifdef CONFIG_SND_DEBUG
439 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
440 entry->c.text.read_size = 64;
441 entry->c.text.read = snd_pcm_xrun_debug_read;
442 entry->c.text.write_size = 64;
443 entry->c.text.write = snd_pcm_xrun_debug_write;
444 entry->private_data = pstr;
445 if (snd_info_register(entry) < 0) {
446 snd_info_free_entry(entry);
447 entry = NULL;
448 }
449 }
450 pstr->proc_xrun_debug_entry = entry;
451 #endif
452 return 0;
453 }
454
455 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
456 {
457 #ifdef CONFIG_SND_DEBUG
458 if (pstr->proc_xrun_debug_entry) {
459 snd_info_unregister(pstr->proc_xrun_debug_entry);
460 pstr->proc_xrun_debug_entry = NULL;
461 }
462 #endif
463 if (pstr->proc_info_entry) {
464 snd_info_unregister(pstr->proc_info_entry);
465 pstr->proc_info_entry = NULL;
466 }
467 if (pstr->proc_root) {
468 snd_info_unregister(pstr->proc_root);
469 pstr->proc_root = NULL;
470 }
471 return 0;
472 }
473
474 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
475 {
476 snd_info_entry_t *entry;
477 snd_card_t *card;
478 char name[16];
479
480 card = substream->pcm->card;
481
482 sprintf(name, "sub%i", substream->number);
483 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
484 return -ENOMEM;
485 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
486 if (snd_info_register(entry) < 0) {
487 snd_info_free_entry(entry);
488 return -ENOMEM;
489 }
490 substream->proc_root = entry;
491
492 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
493 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
494 if (snd_info_register(entry) < 0) {
495 snd_info_free_entry(entry);
496 entry = NULL;
497 }
498 }
499 substream->proc_info_entry = entry;
500
501 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
502 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
503 if (snd_info_register(entry) < 0) {
504 snd_info_free_entry(entry);
505 entry = NULL;
506 }
507 }
508 substream->proc_hw_params_entry = entry;
509
510 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
511 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
512 if (snd_info_register(entry) < 0) {
513 snd_info_free_entry(entry);
514 entry = NULL;
515 }
516 }
517 substream->proc_sw_params_entry = entry;
518
519 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
520 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
521 if (snd_info_register(entry) < 0) {
522 snd_info_free_entry(entry);
523 entry = NULL;
524 }
525 }
526 substream->proc_status_entry = entry;
527
528 return 0;
529 }
530
531 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
532 {
533 if (substream->proc_info_entry) {
534 snd_info_unregister(substream->proc_info_entry);
535 substream->proc_info_entry = NULL;
536 }
537 if (substream->proc_hw_params_entry) {
538 snd_info_unregister(substream->proc_hw_params_entry);
539 substream->proc_hw_params_entry = NULL;
540 }
541 if (substream->proc_sw_params_entry) {
542 snd_info_unregister(substream->proc_sw_params_entry);
543 substream->proc_sw_params_entry = NULL;
544 }
545 if (substream->proc_status_entry) {
546 snd_info_unregister(substream->proc_status_entry);
547 substream->proc_status_entry = NULL;
548 }
549 if (substream->proc_root) {
550 snd_info_unregister(substream->proc_root);
551 substream->proc_root = NULL;
552 }
553 return 0;
554 }
555
556 /**
557 * snd_pcm_new_stream - create a new PCM stream
558 * @pcm: the pcm instance
559 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
560 * @substream_count: the number of substreams
561 *
562 * Creates a new stream for the pcm.
563 * The corresponding stream on the pcm must have been empty before
564 * calling this, i.e. zero must be given to the argument of
565 * snd_pcm_new().
566 *
567 * Returns zero if successful, or a negative error code on failure.
568 */
569 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
570 {
571 int idx, err;
572 snd_pcm_str_t *pstr = &pcm->streams[stream];
573 snd_pcm_substream_t *substream, *prev;
574
575 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
576 init_MUTEX(&pstr->oss.setup_mutex);
577 #endif
578 pstr->stream = stream;
579 pstr->pcm = pcm;
580 pstr->substream_count = substream_count;
581 pstr->reg = &snd_pcm_reg[stream];
582 if (substream_count > 0) {
583 err = snd_pcm_stream_proc_init(pstr);
584 if (err < 0)
585 return err;
586 }
587 prev = NULL;
588 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
589 substream = kcalloc(1, sizeof(*substream), GFP_KERNEL);
590 if (substream == NULL)
591 return -ENOMEM;
592 substream->pcm = pcm;
593 substream->pstr = pstr;
594 substream->number = idx;
595 substream->stream = stream;
596 sprintf(substream->name, "subdevice #%i", idx);
597 substream->buffer_bytes_max = UINT_MAX;
598 if (prev == NULL)
599 pstr->substream = substream;
600 else
601 prev->next = substream;
602 err = snd_pcm_substream_proc_init(substream);
603 if (err < 0) {
604 kfree(substream);
605 return err;
606 }
607 substream->group = &substream->self_group;
608 spin_lock_init(&substream->self_group.lock);
609 INIT_LIST_HEAD(&substream->self_group.substreams);
610 list_add_tail(&substream->link_list, &substream->self_group.substreams);
611 spin_lock_init(&substream->timer_lock);
612 prev = substream;
613 }
614 return 0;
615 }
616
617 /**
618 * snd_pcm_new - create a new PCM instance
619 * @card: the card instance
620 * @id: the id string
621 * @device: the device index (zero based)
622 * @playback_count: the number of substreams for playback
623 * @capture_count: the number of substreams for capture
624 * @rpcm: the pointer to store the new pcm instance
625 *
626 * Creates a new PCM instance.
627 *
628 * The pcm operators have to be set afterwards to the new instance
629 * via snd_pcm_set_ops().
630 *
631 * Returns zero if successful, or a negative error code on failure.
632 */
633 int snd_pcm_new(snd_card_t * card, char *id, int device,
634 int playback_count, int capture_count,
635 snd_pcm_t ** rpcm)
636 {
637 snd_pcm_t *pcm;
638 int err;
639 static snd_device_ops_t ops = {
640 .dev_free = snd_pcm_dev_free,
641 .dev_register = snd_pcm_dev_register,
642 .dev_disconnect = snd_pcm_dev_disconnect,
643 .dev_unregister = snd_pcm_dev_unregister
644 };
645
646 snd_assert(rpcm != NULL, return -EINVAL);
647 *rpcm = NULL;
648 snd_assert(card != NULL, return -ENXIO);
649 pcm = kcalloc(1, sizeof(*pcm), GFP_KERNEL);
650 if (pcm == NULL)
651 return -ENOMEM;
652 pcm->card = card;
653 pcm->device = device;
654 if (id) {
655 strlcpy(pcm->id, id, sizeof(pcm->id));
656 }
657 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
658 snd_pcm_free(pcm);
659 return err;
660 }
661 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
662 snd_pcm_free(pcm);
663 return err;
664 }
665 init_MUTEX(&pcm->open_mutex);
666 init_waitqueue_head(&pcm->open_wait);
667 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
668 snd_pcm_free(pcm);
669 return err;
670 }
671 *rpcm = pcm;
672 return 0;
673 }
674
675 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
676 {
677 snd_pcm_substream_t *substream, *substream_next;
678 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
679 snd_pcm_oss_setup_t *setup, *setupn;
680 #endif
681 substream = pstr->substream;
682 while (substream) {
683 substream_next = substream->next;
684 snd_pcm_substream_proc_done(substream);
685 kfree(substream);
686 substream = substream_next;
687 }
688 snd_pcm_stream_proc_done(pstr);
689 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
690 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
691 setupn = setup->next;
692 kfree(setup->task_name);
693 kfree(setup);
694 }
695 #endif
696 }
697
698 static int snd_pcm_free(snd_pcm_t *pcm)
699 {
700 snd_assert(pcm != NULL, return -ENXIO);
701 if (pcm->private_free)
702 pcm->private_free(pcm);
703 snd_pcm_lib_preallocate_free_for_all(pcm);
704 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
705 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
706 kfree(pcm);
707 return 0;
708 }
709
710 static int snd_pcm_dev_free(snd_device_t *device)
711 {
712 snd_pcm_t *pcm = device->device_data;
713 return snd_pcm_free(pcm);
714 }
715
716 static void snd_pcm_tick_timer_func(unsigned long data)
717 {
718 snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
719 snd_pcm_tick_elapsed(substream);
720 }
721
722 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
723 snd_pcm_substream_t **rsubstream)
724 {
725 snd_pcm_str_t * pstr;
726 snd_pcm_substream_t * substream;
727 snd_pcm_runtime_t * runtime;
728 snd_ctl_file_t *kctl;
729 snd_card_t *card;
730 struct list_head *list;
731 int prefer_subdevice = -1;
732 size_t size;
733
734 snd_assert(rsubstream != NULL, return -EINVAL);
735 *rsubstream = NULL;
736 snd_assert(pcm != NULL, return -ENXIO);
737 pstr = &pcm->streams[stream];
738 if (pstr->substream == NULL)
739 return -ENODEV;
740
741 card = pcm->card;
742 down_read(&card->controls_rwsem);
743 list_for_each(list, &card->ctl_files) {
744 kctl = snd_ctl_file(list);
745 if (kctl->pid == current->pid) {
746 prefer_subdevice = kctl->prefer_pcm_subdevice;
747 break;
748 }
749 }
750 up_read(&card->controls_rwsem);
751
752 if (pstr->substream_count == 0)
753 return -ENODEV;
754 switch (stream) {
755 case SNDRV_PCM_STREAM_PLAYBACK:
756 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
757 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
758 if (SUBSTREAM_BUSY(substream))
759 return -EAGAIN;
760 }
761 }
762 break;
763 case SNDRV_PCM_STREAM_CAPTURE:
764 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
765 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
766 if (SUBSTREAM_BUSY(substream))
767 return -EAGAIN;
768 }
769 }
770 break;
771 default:
772 return -EINVAL;
773 }
774
775 if (prefer_subdevice >= 0) {
776 for (substream = pstr->substream; substream; substream = substream->next)
777 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
778 goto __ok;
779 }
780 for (substream = pstr->substream; substream; substream = substream->next)
781 if (!SUBSTREAM_BUSY(substream))
782 break;
783 __ok:
784 if (substream == NULL)
785 return -EAGAIN;
786
787 runtime = kcalloc(1, sizeof(*runtime), GFP_KERNEL);
788 if (runtime == NULL)
789 return -ENOMEM;
790
791 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
792 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
793 if (runtime->status == NULL) {
794 kfree(runtime);
795 return -ENOMEM;
796 }
797 memset((void*)runtime->status, 0, size);
798
799 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
800 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
801 if (runtime->control == NULL) {
802 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
803 kfree(runtime);
804 return -ENOMEM;
805 }
806 memset((void*)runtime->control, 0, size);
807
808 init_waitqueue_head(&runtime->sleep);
809 atomic_set(&runtime->mmap_count, 0);
810 init_timer(&runtime->tick_timer);
811 runtime->tick_timer.function = snd_pcm_tick_timer_func;
812 runtime->tick_timer.data = (unsigned long) substream;
813
814 runtime->status->state = SNDRV_PCM_STATE_OPEN;
815
816 substream->runtime = runtime;
817 substream->private_data = pcm->private_data;
818 pstr->substream_opened++;
819 *rsubstream = substream;
820 return 0;
821 }
822
823 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
824 {
825 snd_pcm_runtime_t * runtime;
826 substream->file = NULL;
827 runtime = substream->runtime;
828 snd_assert(runtime != NULL, return);
829 if (runtime->private_free != NULL)
830 runtime->private_free(runtime);
831 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
832 snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
833 kfree(runtime->hw_constraints.rules);
834 kfree(runtime);
835 substream->runtime = NULL;
836 substream->pstr->substream_opened--;
837 }
838
839 static int snd_pcm_dev_register(snd_device_t *device)
840 {
841 int idx, cidx, err;
842 unsigned short minor;
843 snd_pcm_substream_t *substream;
844 struct list_head *list;
845 char str[16];
846 snd_pcm_t *pcm = device->device_data;
847
848 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
849 down(®ister_mutex);
850 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
851 if (snd_pcm_devices[idx]) {
852 up(®ister_mutex);
853 return -EBUSY;
854 }
855 snd_pcm_devices[idx] = pcm;
856 for (cidx = 0; cidx < 2; cidx++) {
857 int devtype = -1;
858 if (pcm->streams[cidx].substream == NULL)
859 continue;
860 switch (cidx) {
861 case SNDRV_PCM_STREAM_PLAYBACK:
862 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
863 minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
864 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
865 break;
866 case SNDRV_PCM_STREAM_CAPTURE:
867 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
868 minor = SNDRV_MINOR_PCM_CAPTURE + idx;
869 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
870 break;
871 }
872 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
873 snd_pcm_devices[idx] = NULL;
874 up(®ister_mutex);
875 return err;
876 }
877 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
878 snd_pcm_timer_init(substream);
879 }
880 list_for_each(list, &snd_pcm_notify_list) {
881 snd_pcm_notify_t *notify;
882 notify = list_entry(list, snd_pcm_notify_t, list);
883 notify->n_register(pcm);
884 }
885 up(®ister_mutex);
886 return 0;
887 }
888
889 static int snd_pcm_dev_disconnect(snd_device_t *device)
890 {
891 snd_pcm_t *pcm = device->device_data;
892 struct list_head *list;
893 snd_pcm_substream_t *substream;
894 int idx, cidx;
895
896 down(®ister_mutex);
897 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
898 snd_pcm_devices[idx] = NULL;
899 for (cidx = 0; cidx < 2; cidx++)
900 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
901 if (substream->runtime)
902 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
903 list_for_each(list, &snd_pcm_notify_list) {
904 snd_pcm_notify_t *notify;
905 notify = list_entry(list, snd_pcm_notify_t, list);
906 notify->n_disconnect(pcm);
907 }
908 up(®ister_mutex);
909 return 0;
910 }
911
912 static int snd_pcm_dev_unregister(snd_device_t *device)
913 {
914 int idx, cidx, devtype;
915 snd_pcm_substream_t *substream;
916 struct list_head *list;
917 snd_pcm_t *pcm = device->device_data;
918
919 snd_assert(pcm != NULL, return -ENXIO);
920 down(®ister_mutex);
921 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
922 snd_pcm_devices[idx] = NULL;
923 for (cidx = 0; cidx < 2; cidx++) {
924 devtype = -1;
925 switch (cidx) {
926 case SNDRV_PCM_STREAM_PLAYBACK:
927 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
928 break;
929 case SNDRV_PCM_STREAM_CAPTURE:
930 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
931 break;
932 }
933 snd_unregister_device(devtype, pcm->card, pcm->device);
934 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
935 snd_pcm_timer_done(substream);
936 }
937 list_for_each(list, &snd_pcm_notify_list) {
938 snd_pcm_notify_t *notify;
939 notify = list_entry(list, snd_pcm_notify_t, list);
940 notify->n_unregister(pcm);
941 }
942 up(®ister_mutex);
943 return snd_pcm_free(pcm);
944 }
945
946 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
947 {
948 int idx;
949
950 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
951 down(®ister_mutex);
952 if (nfree) {
953 list_del(¬ify->list);
954 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
955 if (snd_pcm_devices[idx] == NULL)
956 continue;
957 notify->n_unregister(snd_pcm_devices[idx]);
958 }
959 } else {
960 list_add_tail(¬ify->list, &snd_pcm_notify_list);
961 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
962 if (snd_pcm_devices[idx] == NULL)
963 continue;
964 notify->n_register(snd_pcm_devices[idx]);
965 }
966 }
967 up(®ister_mutex);
968 return 0;
969 }
970
971 /*
972 * Info interface
973 */
974
975 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
976 {
977 int idx;
978 snd_pcm_t *pcm;
979
980 down(®ister_mutex);
981 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
982 pcm = snd_pcm_devices[idx];
983 if (pcm == NULL)
984 continue;
985 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
986 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
987 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
988 snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
989 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
990 snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
991 snd_iprintf(buffer, "\n");
992 }
993 up(®ister_mutex);
994 }
995
996 /*
997 * ENTRY functions
998 */
999
1000 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1001
1002 static int __init alsa_pcm_init(void)
1003 {
1004 snd_info_entry_t *entry;
1005
1006 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1007 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1008 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1009 if (snd_info_register(entry) < 0) {
1010 snd_info_free_entry(entry);
1011 entry = NULL;
1012 }
1013 }
1014 snd_pcm_proc_entry = entry;
1015 return 0;
1016 }
1017
1018 static void __exit alsa_pcm_exit(void)
1019 {
1020 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1021 if (snd_pcm_proc_entry) {
1022 snd_info_unregister(snd_pcm_proc_entry);
1023 snd_pcm_proc_entry = NULL;
1024 }
1025 }
1026
1027 module_init(alsa_pcm_init)
1028 module_exit(alsa_pcm_exit)
1029
1030 EXPORT_SYMBOL(snd_pcm_devices);
1031 EXPORT_SYMBOL(snd_pcm_new);
1032 EXPORT_SYMBOL(snd_pcm_new_stream);
1033 EXPORT_SYMBOL(snd_pcm_notify);
1034 EXPORT_SYMBOL(snd_pcm_open_substream);
1035 EXPORT_SYMBOL(snd_pcm_release_substream);
1036 EXPORT_SYMBOL(snd_pcm_format_name);
1037 /* pcm_native.c */
1038 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1039 EXPORT_SYMBOL(snd_pcm_start);
1040 #ifdef CONFIG_PM
1041 EXPORT_SYMBOL(snd_pcm_suspend);
1042 EXPORT_SYMBOL(snd_pcm_suspend_all);
1043 #endif
1044 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1045 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1046 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1047 EXPORT_SYMBOL(snd_pcm_mmap_data);
1048 #if SNDRV_PCM_INFO_MMAP_IOMEM
1049 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1050 #endif
1051 /* pcm_misc.c */
1052 EXPORT_SYMBOL(snd_pcm_format_signed);
1053 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1054 EXPORT_SYMBOL(snd_pcm_format_linear);
1055 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1056 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1057 EXPORT_SYMBOL(snd_pcm_format_width);
1058 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1059 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1060 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1061 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1062 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
1063
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