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[PATCH] fix semaphore handling in __unregister_chrdev_region
[linux/fpc-iii.git] / sound / core / pcm.c
blob8d94325529a87258bcdade5152f55fdb8f37b53f
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
276 snd_runtime_check(substream, return);
277
278 info = kmalloc(sizeof(*info), GFP_KERNEL);
279 if (! info) {
280 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
281 return;
282 }
283
284 err = snd_pcm_info(substream, info);
285 if (err < 0) {
286 snd_iprintf(buffer, "error %d\n", err);
287 kfree(info);
288 return;
289 }
290 snd_iprintf(buffer, "card: %d\n", info->card);
291 snd_iprintf(buffer, "device: %d\n", info->device);
292 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
293 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
294 snd_iprintf(buffer, "id: %s\n", info->id);
295 snd_iprintf(buffer, "name: %s\n", info->name);
296 snd_iprintf(buffer, "subname: %s\n", info->subname);
297 snd_iprintf(buffer, "class: %d\n", info->dev_class);
298 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
299 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
300 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
301 kfree(info);
302 }
303
304 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
305 {
306 snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
307 }
308
309 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
310 {
311 snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
312 }
313
314 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
315 {
316 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
317 snd_pcm_runtime_t *runtime = substream->runtime;
318 if (!runtime) {
319 snd_iprintf(buffer, "closed\n");
320 return;
321 }
322 snd_pcm_stream_lock_irq(substream);
323 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
324 snd_iprintf(buffer, "no setup\n");
325 snd_pcm_stream_unlock_irq(substream);
326 return;
327 }
328 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
329 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
330 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
331 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
332 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
333 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
334 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
335 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
337 if (substream->oss.oss) {
338 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
339 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
340 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
341 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
342 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
343 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
344 }
345 #endif
346 snd_pcm_stream_unlock_irq(substream);
347 }
348
349 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
350 {
351 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
352 snd_pcm_runtime_t *runtime = substream->runtime;
353 if (!runtime) {
354 snd_iprintf(buffer, "closed\n");
355 return;
356 }
357 snd_pcm_stream_lock_irq(substream);
358 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
359 snd_iprintf(buffer, "no setup\n");
360 snd_pcm_stream_unlock_irq(substream);
361 return;
362 }
363 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
364 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
365 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
366 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
367 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
368 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
369 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
370 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
371 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
372 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
373 snd_pcm_stream_unlock_irq(substream);
374 }
375
376 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
377 {
378 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
379 snd_pcm_runtime_t *runtime = substream->runtime;
380 snd_pcm_status_t status;
381 int err;
382 if (!runtime) {
383 snd_iprintf(buffer, "closed\n");
384 return;
385 }
386 memset(&status, 0, sizeof(status));
387 err = snd_pcm_status(substream, &status);
388 if (err < 0) {
389 snd_iprintf(buffer, "error %d\n", err);
390 return;
391 }
392 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
393 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
394 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
395 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
396 status.tstamp.tv_sec, status.tstamp.tv_nsec);
397 snd_iprintf(buffer, "delay : %ld\n", status.delay);
398 snd_iprintf(buffer, "avail : %ld\n", status.avail);
399 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
400 snd_iprintf(buffer, "-----\n");
401 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
402 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
403 }
404 #endif
405
406 #ifdef CONFIG_SND_DEBUG
407 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
408 {
409 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
410 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
411 }
412
413 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
414 {
415 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
416 char line[64];
417 if (!snd_info_get_line(buffer, line, sizeof(line)))
418 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
419 }
420 #endif
421
422 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
423 {
424 snd_pcm_t *pcm = pstr->pcm;
425 snd_info_entry_t *entry;
426 char name[16];
427
428 sprintf(name, "pcm%i%c", pcm->device,
429 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
430 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
431 return -ENOMEM;
432 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
433 if (snd_info_register(entry) < 0) {
434 snd_info_free_entry(entry);
435 return -ENOMEM;
436 }
437 pstr->proc_root = entry;
438
439 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
440 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
441 if (snd_info_register(entry) < 0) {
442 snd_info_free_entry(entry);
443 entry = NULL;
444 }
445 }
446 pstr->proc_info_entry = entry;
447
448 #ifdef CONFIG_SND_DEBUG
449 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
450 entry->c.text.read_size = 64;
451 entry->c.text.read = snd_pcm_xrun_debug_read;
452 entry->c.text.write_size = 64;
453 entry->c.text.write = snd_pcm_xrun_debug_write;
454 entry->private_data = pstr;
455 if (snd_info_register(entry) < 0) {
456 snd_info_free_entry(entry);
457 entry = NULL;
458 }
459 }
460 pstr->proc_xrun_debug_entry = entry;
461 #endif
462 return 0;
463 }
464
465 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
466 {
467 #ifdef CONFIG_SND_DEBUG
468 if (pstr->proc_xrun_debug_entry) {
469 snd_info_unregister(pstr->proc_xrun_debug_entry);
470 pstr->proc_xrun_debug_entry = NULL;
471 }
472 #endif
473 if (pstr->proc_info_entry) {
474 snd_info_unregister(pstr->proc_info_entry);
475 pstr->proc_info_entry = NULL;
476 }
477 if (pstr->proc_root) {
478 snd_info_unregister(pstr->proc_root);
479 pstr->proc_root = NULL;
480 }
481 return 0;
482 }
483
484 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
485 {
486 snd_info_entry_t *entry;
487 snd_card_t *card;
488 char name[16];
489
490 card = substream->pcm->card;
491
492 sprintf(name, "sub%i", substream->number);
493 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
494 return -ENOMEM;
495 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
496 if (snd_info_register(entry) < 0) {
497 snd_info_free_entry(entry);
498 return -ENOMEM;
499 }
500 substream->proc_root = entry;
501
502 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
503 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
504 if (snd_info_register(entry) < 0) {
505 snd_info_free_entry(entry);
506 entry = NULL;
507 }
508 }
509 substream->proc_info_entry = entry;
510
511 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
512 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
513 if (snd_info_register(entry) < 0) {
514 snd_info_free_entry(entry);
515 entry = NULL;
516 }
517 }
518 substream->proc_hw_params_entry = entry;
519
520 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
521 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
522 if (snd_info_register(entry) < 0) {
523 snd_info_free_entry(entry);
524 entry = NULL;
525 }
526 }
527 substream->proc_sw_params_entry = entry;
528
529 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
530 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
531 if (snd_info_register(entry) < 0) {
532 snd_info_free_entry(entry);
533 entry = NULL;
534 }
535 }
536 substream->proc_status_entry = entry;
537
538 return 0;
539 }
540
541 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
542 {
543 if (substream->proc_info_entry) {
544 snd_info_unregister(substream->proc_info_entry);
545 substream->proc_info_entry = NULL;
546 }
547 if (substream->proc_hw_params_entry) {
548 snd_info_unregister(substream->proc_hw_params_entry);
549 substream->proc_hw_params_entry = NULL;
550 }
551 if (substream->proc_sw_params_entry) {
552 snd_info_unregister(substream->proc_sw_params_entry);
553 substream->proc_sw_params_entry = NULL;
554 }
555 if (substream->proc_status_entry) {
556 snd_info_unregister(substream->proc_status_entry);
557 substream->proc_status_entry = NULL;
558 }
559 if (substream->proc_root) {
560 snd_info_unregister(substream->proc_root);
561 substream->proc_root = NULL;
562 }
563 return 0;
564 }
565
566 /**
567 * snd_pcm_new_stream - create a new PCM stream
568 * @pcm: the pcm instance
569 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
570 * @substream_count: the number of substreams
571 *
572 * Creates a new stream for the pcm.
573 * The corresponding stream on the pcm must have been empty before
574 * calling this, i.e. zero must be given to the argument of
575 * snd_pcm_new().
576 *
577 * Returns zero if successful, or a negative error code on failure.
578 */
579 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
580 {
581 int idx, err;
582 snd_pcm_str_t *pstr = &pcm->streams[stream];
583 snd_pcm_substream_t *substream, *prev;
584
585 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
586 init_MUTEX(&pstr->oss.setup_mutex);
587 #endif
588 pstr->stream = stream;
589 pstr->pcm = pcm;
590 pstr->substream_count = substream_count;
591 pstr->reg = &snd_pcm_reg[stream];
592 if (substream_count > 0) {
593 err = snd_pcm_stream_proc_init(pstr);
594 if (err < 0)
595 return err;
596 }
597 prev = NULL;
598 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
599 substream = kcalloc(1, sizeof(*substream), GFP_KERNEL);
600 if (substream == NULL)
601 return -ENOMEM;
602 substream->pcm = pcm;
603 substream->pstr = pstr;
604 substream->number = idx;
605 substream->stream = stream;
606 sprintf(substream->name, "subdevice #%i", idx);
607 substream->buffer_bytes_max = UINT_MAX;
608 if (prev == NULL)
609 pstr->substream = substream;
610 else
611 prev->next = substream;
612 err = snd_pcm_substream_proc_init(substream);
613 if (err < 0) {
614 kfree(substream);
615 return err;
616 }
617 substream->group = &substream->self_group;
618 spin_lock_init(&substream->self_group.lock);
619 INIT_LIST_HEAD(&substream->self_group.substreams);
620 list_add_tail(&substream->link_list, &substream->self_group.substreams);
621 spin_lock_init(&substream->timer_lock);
622 prev = substream;
623 }
624 return 0;
625 }
626
627 /**
628 * snd_pcm_new - create a new PCM instance
629 * @card: the card instance
630 * @id: the id string
631 * @device: the device index (zero based)
632 * @playback_count: the number of substreams for playback
633 * @capture_count: the number of substreams for capture
634 * @rpcm: the pointer to store the new pcm instance
635 *
636 * Creates a new PCM instance.
637 *
638 * The pcm operators have to be set afterwards to the new instance
639 * via snd_pcm_set_ops().
640 *
641 * Returns zero if successful, or a negative error code on failure.
642 */
643 int snd_pcm_new(snd_card_t * card, char *id, int device,
644 int playback_count, int capture_count,
645 snd_pcm_t ** rpcm)
646 {
647 snd_pcm_t *pcm;
648 int err;
649 static snd_device_ops_t ops = {
650 .dev_free = snd_pcm_dev_free,
651 .dev_register = snd_pcm_dev_register,
652 .dev_disconnect = snd_pcm_dev_disconnect,
653 .dev_unregister = snd_pcm_dev_unregister
654 };
655
656 snd_assert(rpcm != NULL, return -EINVAL);
657 *rpcm = NULL;
658 snd_assert(card != NULL, return -ENXIO);
659 pcm = kcalloc(1, sizeof(*pcm), GFP_KERNEL);
660 if (pcm == NULL)
661 return -ENOMEM;
662 pcm->card = card;
663 pcm->device = device;
664 if (id) {
665 strlcpy(pcm->id, id, sizeof(pcm->id));
666 }
667 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
668 snd_pcm_free(pcm);
669 return err;
670 }
671 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
672 snd_pcm_free(pcm);
673 return err;
674 }
675 init_MUTEX(&pcm->open_mutex);
676 init_waitqueue_head(&pcm->open_wait);
677 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
678 snd_pcm_free(pcm);
679 return err;
680 }
681 *rpcm = pcm;
682 return 0;
683 }
684
685 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
686 {
687 snd_pcm_substream_t *substream, *substream_next;
688 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
689 snd_pcm_oss_setup_t *setup, *setupn;
690 #endif
691 substream = pstr->substream;
692 while (substream) {
693 substream_next = substream->next;
694 snd_pcm_substream_proc_done(substream);
695 kfree(substream);
696 substream = substream_next;
697 }
698 snd_pcm_stream_proc_done(pstr);
699 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
700 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
701 setupn = setup->next;
702 kfree(setup->task_name);
703 kfree(setup);
704 }
705 #endif
706 }
707
708 static int snd_pcm_free(snd_pcm_t *pcm)
709 {
710 snd_assert(pcm != NULL, return -ENXIO);
711 if (pcm->private_free)
712 pcm->private_free(pcm);
713 snd_pcm_lib_preallocate_free_for_all(pcm);
714 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
715 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
716 kfree(pcm);
717 return 0;
718 }
719
720 static int snd_pcm_dev_free(snd_device_t *device)
721 {
722 snd_pcm_t *pcm = device->device_data;
723 return snd_pcm_free(pcm);
724 }
725
726 static void snd_pcm_tick_timer_func(unsigned long data)
727 {
728 snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
729 snd_pcm_tick_elapsed(substream);
730 }
731
732 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
733 snd_pcm_substream_t **rsubstream)
734 {
735 snd_pcm_str_t * pstr;
736 snd_pcm_substream_t * substream;
737 snd_pcm_runtime_t * runtime;
738 snd_ctl_file_t *kctl;
739 snd_card_t *card;
740 struct list_head *list;
741 int prefer_subdevice = -1;
742 size_t size;
743
744 snd_assert(rsubstream != NULL, return -EINVAL);
745 *rsubstream = NULL;
746 snd_assert(pcm != NULL, return -ENXIO);
747 pstr = &pcm->streams[stream];
748 if (pstr->substream == NULL)
749 return -ENODEV;
750
751 card = pcm->card;
752 down_read(&card->controls_rwsem);
753 list_for_each(list, &card->ctl_files) {
754 kctl = snd_ctl_file(list);
755 if (kctl->pid == current->pid) {
756 prefer_subdevice = kctl->prefer_pcm_subdevice;
757 break;
758 }
759 }
760 up_read(&card->controls_rwsem);
761
762 if (pstr->substream_count == 0)
763 return -ENODEV;
764 switch (stream) {
765 case SNDRV_PCM_STREAM_PLAYBACK:
766 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
767 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
768 if (SUBSTREAM_BUSY(substream))
769 return -EAGAIN;
770 }
771 }
772 break;
773 case SNDRV_PCM_STREAM_CAPTURE:
774 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
775 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
776 if (SUBSTREAM_BUSY(substream))
777 return -EAGAIN;
778 }
779 }
780 break;
781 default:
782 return -EINVAL;
783 }
784
785 if (prefer_subdevice >= 0) {
786 for (substream = pstr->substream; substream; substream = substream->next)
787 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
788 goto __ok;
789 }
790 for (substream = pstr->substream; substream; substream = substream->next)
791 if (!SUBSTREAM_BUSY(substream))
792 break;
793 __ok:
794 if (substream == NULL)
795 return -EAGAIN;
796
797 runtime = kcalloc(1, sizeof(*runtime), GFP_KERNEL);
798 if (runtime == NULL)
799 return -ENOMEM;
800
801 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
802 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
803 if (runtime->status == NULL) {
804 kfree(runtime);
805 return -ENOMEM;
806 }
807 memset((void*)runtime->status, 0, size);
808
809 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
810 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
811 if (runtime->control == NULL) {
812 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
813 kfree(runtime);
814 return -ENOMEM;
815 }
816 memset((void*)runtime->control, 0, size);
817
818 init_waitqueue_head(&runtime->sleep);
819 atomic_set(&runtime->mmap_count, 0);
820 init_timer(&runtime->tick_timer);
821 runtime->tick_timer.function = snd_pcm_tick_timer_func;
822 runtime->tick_timer.data = (unsigned long) substream;
823
824 runtime->status->state = SNDRV_PCM_STATE_OPEN;
825
826 substream->runtime = runtime;
827 substream->private_data = pcm->private_data;
828 pstr->substream_opened++;
829 *rsubstream = substream;
830 return 0;
831 }
832
833 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
834 {
835 snd_pcm_runtime_t * runtime;
836 substream->file = NULL;
837 runtime = substream->runtime;
838 snd_assert(runtime != NULL, return);
839 if (runtime->private_free != NULL)
840 runtime->private_free(runtime);
841 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
842 snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
843 kfree(runtime->hw_constraints.rules);
844 kfree(runtime);
845 substream->runtime = NULL;
846 substream->pstr->substream_opened--;
847 }
848
849 static int snd_pcm_dev_register(snd_device_t *device)
850 {
851 int idx, cidx, err;
852 unsigned short minor;
853 snd_pcm_substream_t *substream;
854 struct list_head *list;
855 char str[16];
856 snd_pcm_t *pcm = device->device_data;
857
858 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
859 down(&register_mutex);
860 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
861 if (snd_pcm_devices[idx]) {
862 up(&register_mutex);
863 return -EBUSY;
864 }
865 snd_pcm_devices[idx] = pcm;
866 for (cidx = 0; cidx < 2; cidx++) {
867 int devtype = -1;
868 if (pcm->streams[cidx].substream == NULL)
869 continue;
870 switch (cidx) {
871 case SNDRV_PCM_STREAM_PLAYBACK:
872 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
873 minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
874 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
875 break;
876 case SNDRV_PCM_STREAM_CAPTURE:
877 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
878 minor = SNDRV_MINOR_PCM_CAPTURE + idx;
879 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
880 break;
881 }
882 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
883 snd_pcm_devices[idx] = NULL;
884 up(&register_mutex);
885 return err;
886 }
887 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
888 snd_pcm_timer_init(substream);
889 }
890 list_for_each(list, &snd_pcm_notify_list) {
891 snd_pcm_notify_t *notify;
892 notify = list_entry(list, snd_pcm_notify_t, list);
893 notify->n_register(pcm);
894 }
895 up(&register_mutex);
896 return 0;
897 }
898
899 static int snd_pcm_dev_disconnect(snd_device_t *device)
900 {
901 snd_pcm_t *pcm = device->device_data;
902 struct list_head *list;
903 snd_pcm_substream_t *substream;
904 int idx, cidx;
905
906 down(&register_mutex);
907 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
908 snd_pcm_devices[idx] = NULL;
909 for (cidx = 0; cidx < 2; cidx++)
910 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
911 if (substream->runtime)
912 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
913 list_for_each(list, &snd_pcm_notify_list) {
914 snd_pcm_notify_t *notify;
915 notify = list_entry(list, snd_pcm_notify_t, list);
916 notify->n_disconnect(pcm);
917 }
918 up(&register_mutex);
919 return 0;
920 }
921
922 static int snd_pcm_dev_unregister(snd_device_t *device)
923 {
924 int idx, cidx, devtype;
925 snd_pcm_substream_t *substream;
926 struct list_head *list;
927 snd_pcm_t *pcm = device->device_data;
928
929 snd_assert(pcm != NULL, return -ENXIO);
930 down(&register_mutex);
931 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
932 snd_pcm_devices[idx] = NULL;
933 for (cidx = 0; cidx < 2; cidx++) {
934 devtype = -1;
935 switch (cidx) {
936 case SNDRV_PCM_STREAM_PLAYBACK:
937 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
938 break;
939 case SNDRV_PCM_STREAM_CAPTURE:
940 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
941 break;
942 }
943 snd_unregister_device(devtype, pcm->card, pcm->device);
944 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
945 snd_pcm_timer_done(substream);
946 }
947 list_for_each(list, &snd_pcm_notify_list) {
948 snd_pcm_notify_t *notify;
949 notify = list_entry(list, snd_pcm_notify_t, list);
950 notify->n_unregister(pcm);
951 }
952 up(&register_mutex);
953 return snd_pcm_free(pcm);
954 }
955
956 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
957 {
958 int idx;
959
960 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
961 down(&register_mutex);
962 if (nfree) {
963 list_del(&notify->list);
964 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
965 if (snd_pcm_devices[idx] == NULL)
966 continue;
967 notify->n_unregister(snd_pcm_devices[idx]);
968 }
969 } else {
970 list_add_tail(&notify->list, &snd_pcm_notify_list);
971 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
972 if (snd_pcm_devices[idx] == NULL)
973 continue;
974 notify->n_register(snd_pcm_devices[idx]);
975 }
976 }
977 up(&register_mutex);
978 return 0;
979 }
980
981 /*
982 * Info interface
983 */
984
985 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
986 {
987 int idx;
988 snd_pcm_t *pcm;
989
990 down(&register_mutex);
991 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
992 pcm = snd_pcm_devices[idx];
993 if (pcm == NULL)
994 continue;
995 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
996 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
997 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
998 snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
999 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1000 snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1001 snd_iprintf(buffer, "\n");
1002 }
1003 up(&register_mutex);
1004 }
1005
1006 /*
1007 * ENTRY functions
1008 */
1009
1010 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1011
1012 static int __init alsa_pcm_init(void)
1013 {
1014 snd_info_entry_t *entry;
1015
1016 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1017 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1018 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1019 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1020 if (snd_info_register(entry) < 0) {
1021 snd_info_free_entry(entry);
1022 entry = NULL;
1023 }
1024 }
1025 snd_pcm_proc_entry = entry;
1026 return 0;
1027 }
1028
1029 static void __exit alsa_pcm_exit(void)
1030 {
1031 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1032 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1033 if (snd_pcm_proc_entry) {
1034 snd_info_unregister(snd_pcm_proc_entry);
1035 snd_pcm_proc_entry = NULL;
1036 }
1037 }
1038
1039 module_init(alsa_pcm_init)
1040 module_exit(alsa_pcm_exit)
1041
1042 EXPORT_SYMBOL(snd_pcm_devices);
1043 EXPORT_SYMBOL(snd_pcm_new);
1044 EXPORT_SYMBOL(snd_pcm_new_stream);
1045 EXPORT_SYMBOL(snd_pcm_notify);
1046 EXPORT_SYMBOL(snd_pcm_open_substream);
1047 EXPORT_SYMBOL(snd_pcm_release_substream);
1048 EXPORT_SYMBOL(snd_pcm_format_name);
1049 /* pcm_native.c */
1050 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1051 EXPORT_SYMBOL(snd_pcm_start);
1052 #ifdef CONFIG_PM
1053 EXPORT_SYMBOL(snd_pcm_suspend);
1054 EXPORT_SYMBOL(snd_pcm_suspend_all);
1055 #endif
1056 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1057 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1058 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1059 EXPORT_SYMBOL(snd_pcm_mmap_data);
1060 #if SNDRV_PCM_INFO_MMAP_IOMEM
1061 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1062 #endif
1063 /* pcm_misc.c */
1064 EXPORT_SYMBOL(snd_pcm_format_signed);
1065 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1066 EXPORT_SYMBOL(snd_pcm_format_linear);
1067 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1068 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1069 EXPORT_SYMBOL(snd_pcm_format_width);
1070 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1071 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1072 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1073 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1074 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
Linux with added FPC-III support