ALSA: sound: Move dereference after NULL test and drop unnecessary NULL tests
[linux-2.6.git] / sound / core / pcm.c
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
32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34 MODULE_LICENSE("GPL");
35
36 static LIST_HEAD(snd_pcm_devices);
37 static LIST_HEAD(snd_pcm_notify_list);
38 static DEFINE_MUTEX(register_mutex);
39
40 static int snd_pcm_free(struct snd_pcm *pcm);
41 static int snd_pcm_dev_free(struct snd_device *device);
42 static int snd_pcm_dev_register(struct snd_device *device);
43 static int snd_pcm_dev_disconnect(struct snd_device *device);
44
45 static 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
56 static 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
69 static 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
87 static 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(&register_mutex);
99                         device = snd_pcm_next(card, device);
100                         mutex_unlock(&register_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(&register_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(&register_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
167 static 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 };
207
208 const char *snd_pcm_format_name(snd_pcm_format_t format)
209 {
210         return snd_pcm_format_names[format];
211 }
212 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
213
214 #ifdef CONFIG_SND_VERBOSE_PROCFS
215
216 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
217 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
218 #define READY(v) [SNDRV_PCM_READY_##v] = #v
219 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
220 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
221 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
222 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
223 #define START(v) [SNDRV_PCM_START_##v] = #v
224 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
225
226 static char *snd_pcm_stream_names[] = {
227         STREAM(PLAYBACK),
228         STREAM(CAPTURE),
229 };
230
231 static char *snd_pcm_state_names[] = {
232         STATE(OPEN),
233         STATE(SETUP),
234         STATE(PREPARED),
235         STATE(RUNNING),
236         STATE(XRUN),
237         STATE(DRAINING),
238         STATE(PAUSED),
239         STATE(SUSPENDED),
240 };
241
242 static char *snd_pcm_access_names[] = {
243         ACCESS(MMAP_INTERLEAVED), 
244         ACCESS(MMAP_NONINTERLEAVED),
245         ACCESS(MMAP_COMPLEX),
246         ACCESS(RW_INTERLEAVED),
247         ACCESS(RW_NONINTERLEAVED),
248 };
249
250 static char *snd_pcm_subformat_names[] = {
251         SUBFORMAT(STD), 
252 };
253
254 static char *snd_pcm_tstamp_mode_names[] = {
255         TSTAMP(NONE),
256         TSTAMP(ENABLE),
257 };
258
259 static const char *snd_pcm_stream_name(int stream)
260 {
261         return snd_pcm_stream_names[stream];
262 }
263
264 static const char *snd_pcm_access_name(snd_pcm_access_t access)
265 {
266         return snd_pcm_access_names[access];
267 }
268
269 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
270 {
271         return snd_pcm_subformat_names[subformat];
272 }
273
274 static const char *snd_pcm_tstamp_mode_name(int mode)
275 {
276         return snd_pcm_tstamp_mode_names[mode];
277 }
278
279 static const char *snd_pcm_state_name(snd_pcm_state_t state)
280 {
281         return snd_pcm_state_names[state];
282 }
283
284 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
285 #include <linux/soundcard.h>
286
287 static const char *snd_pcm_oss_format_name(int format)
288 {
289         switch (format) {
290         case AFMT_MU_LAW:
291                 return "MU_LAW";
292         case AFMT_A_LAW:
293                 return "A_LAW";
294         case AFMT_IMA_ADPCM:
295                 return "IMA_ADPCM";
296         case AFMT_U8:
297                 return "U8";
298         case AFMT_S16_LE:
299                 return "S16_LE";
300         case AFMT_S16_BE:
301                 return "S16_BE";
302         case AFMT_S8:
303                 return "S8";
304         case AFMT_U16_LE:
305                 return "U16_LE";
306         case AFMT_U16_BE:
307                 return "U16_BE";
308         case AFMT_MPEG:
309                 return "MPEG";
310         default:
311                 return "unknown";
312         }
313 }
314 #endif
315
316 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
317                                    struct snd_info_buffer *buffer)
318 {
319         struct snd_pcm_info *info;
320         int err;
321
322         if (! substream)
323                 return;
324
325         info = kmalloc(sizeof(*info), GFP_KERNEL);
326         if (! info) {
327                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
328                 return;
329         }
330
331         err = snd_pcm_info(substream, info);
332         if (err < 0) {
333                 snd_iprintf(buffer, "error %d\n", err);
334                 kfree(info);
335                 return;
336         }
337         snd_iprintf(buffer, "card: %d\n", info->card);
338         snd_iprintf(buffer, "device: %d\n", info->device);
339         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
340         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
341         snd_iprintf(buffer, "id: %s\n", info->id);
342         snd_iprintf(buffer, "name: %s\n", info->name);
343         snd_iprintf(buffer, "subname: %s\n", info->subname);
344         snd_iprintf(buffer, "class: %d\n", info->dev_class);
345         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
346         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
347         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
348         kfree(info);
349 }
350
351 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
352                                           struct snd_info_buffer *buffer)
353 {
354         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
355                                buffer);
356 }
357
358 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
359                                              struct snd_info_buffer *buffer)
360 {
361         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
362                                buffer);
363 }
364
365 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
366                                                   struct snd_info_buffer *buffer)
367 {
368         struct snd_pcm_substream *substream = entry->private_data;
369         struct snd_pcm_runtime *runtime = substream->runtime;
370         if (!runtime) {
371                 snd_iprintf(buffer, "closed\n");
372                 return;
373         }
374         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
375                 snd_iprintf(buffer, "no setup\n");
376                 return;
377         }
378         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
379         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
380         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
381         snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
382         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
383         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
384         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
385 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
386         if (substream->oss.oss) {
387                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
388                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
389                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
390                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
391                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
392                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
393         }
394 #endif
395 }
396
397 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
398                                                   struct snd_info_buffer *buffer)
399 {
400         struct snd_pcm_substream *substream = entry->private_data;
401         struct snd_pcm_runtime *runtime = substream->runtime;
402         if (!runtime) {
403                 snd_iprintf(buffer, "closed\n");
404                 return;
405         }
406         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
407                 snd_iprintf(buffer, "no setup\n");
408                 return;
409         }
410         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
411         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
412         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
413         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
414         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
415         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
416         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
417         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
418 }
419
420 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
421                                                struct snd_info_buffer *buffer)
422 {
423         struct snd_pcm_substream *substream = entry->private_data;
424         struct snd_pcm_runtime *runtime = substream->runtime;
425         struct snd_pcm_status status;
426         int err;
427         if (!runtime) {
428                 snd_iprintf(buffer, "closed\n");
429                 return;
430         }
431         memset(&status, 0, sizeof(status));
432         err = snd_pcm_status(substream, &status);
433         if (err < 0) {
434                 snd_iprintf(buffer, "error %d\n", err);
435                 return;
436         }
437         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
438         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
439                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
440         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
441                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
442         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
443         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
444         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
445         snd_iprintf(buffer, "-----\n");
446         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
447         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
448 }
449
450 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
451 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
452                                     struct snd_info_buffer *buffer)
453 {
454         struct snd_pcm_str *pstr = entry->private_data;
455         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
456 }
457
458 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
459                                      struct snd_info_buffer *buffer)
460 {
461         struct snd_pcm_str *pstr = entry->private_data;
462         char line[64];
463         if (!snd_info_get_line(buffer, line, sizeof(line)))
464                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
465 }
466 #endif
467
468 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
469 {
470         struct snd_pcm *pcm = pstr->pcm;
471         struct snd_info_entry *entry;
472         char name[16];
473
474         sprintf(name, "pcm%i%c", pcm->device, 
475                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
476         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
477                 return -ENOMEM;
478         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
479         if (snd_info_register(entry) < 0) {
480                 snd_info_free_entry(entry);
481                 return -ENOMEM;
482         }
483         pstr->proc_root = entry;
484
485         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
486                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
487                 if (snd_info_register(entry) < 0) {
488                         snd_info_free_entry(entry);
489                         entry = NULL;
490                 }
491         }
492         pstr->proc_info_entry = entry;
493
494 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
495         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
496                                                 pstr->proc_root)) != NULL) {
497                 entry->c.text.read = snd_pcm_xrun_debug_read;
498                 entry->c.text.write = snd_pcm_xrun_debug_write;
499                 entry->mode |= S_IWUSR;
500                 entry->private_data = pstr;
501                 if (snd_info_register(entry) < 0) {
502                         snd_info_free_entry(entry);
503                         entry = NULL;
504                 }
505         }
506         pstr->proc_xrun_debug_entry = entry;
507 #endif
508         return 0;
509 }
510
511 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
512 {
513 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
514         snd_info_free_entry(pstr->proc_xrun_debug_entry);
515         pstr->proc_xrun_debug_entry = NULL;
516 #endif
517         snd_info_free_entry(pstr->proc_info_entry);
518         pstr->proc_info_entry = NULL;
519         snd_info_free_entry(pstr->proc_root);
520         pstr->proc_root = NULL;
521         return 0;
522 }
523
524 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
525 {
526         struct snd_info_entry *entry;
527         struct snd_card *card;
528         char name[16];
529
530         card = substream->pcm->card;
531
532         sprintf(name, "sub%i", substream->number);
533         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
534                 return -ENOMEM;
535         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
536         if (snd_info_register(entry) < 0) {
537                 snd_info_free_entry(entry);
538                 return -ENOMEM;
539         }
540         substream->proc_root = entry;
541
542         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
543                 snd_info_set_text_ops(entry, substream,
544                                       snd_pcm_substream_proc_info_read);
545                 if (snd_info_register(entry) < 0) {
546                         snd_info_free_entry(entry);
547                         entry = NULL;
548                 }
549         }
550         substream->proc_info_entry = entry;
551
552         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
553                 snd_info_set_text_ops(entry, substream,
554                                       snd_pcm_substream_proc_hw_params_read);
555                 if (snd_info_register(entry) < 0) {
556                         snd_info_free_entry(entry);
557                         entry = NULL;
558                 }
559         }
560         substream->proc_hw_params_entry = entry;
561
562         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
563                 snd_info_set_text_ops(entry, substream,
564                                       snd_pcm_substream_proc_sw_params_read);
565                 if (snd_info_register(entry) < 0) {
566                         snd_info_free_entry(entry);
567                         entry = NULL;
568                 }
569         }
570         substream->proc_sw_params_entry = entry;
571
572         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
573                 snd_info_set_text_ops(entry, substream,
574                                       snd_pcm_substream_proc_status_read);
575                 if (snd_info_register(entry) < 0) {
576                         snd_info_free_entry(entry);
577                         entry = NULL;
578                 }
579         }
580         substream->proc_status_entry = entry;
581
582         return 0;
583 }
584
585 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
586 {
587         snd_info_free_entry(substream->proc_info_entry);
588         substream->proc_info_entry = NULL;
589         snd_info_free_entry(substream->proc_hw_params_entry);
590         substream->proc_hw_params_entry = NULL;
591         snd_info_free_entry(substream->proc_sw_params_entry);
592         substream->proc_sw_params_entry = NULL;
593         snd_info_free_entry(substream->proc_status_entry);
594         substream->proc_status_entry = NULL;
595         snd_info_free_entry(substream->proc_root);
596         substream->proc_root = NULL;
597         return 0;
598 }
599 #else /* !CONFIG_SND_VERBOSE_PROCFS */
600 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
601 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
602 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
603 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
604 #endif /* CONFIG_SND_VERBOSE_PROCFS */
605
606 /**
607  * snd_pcm_new_stream - create a new PCM stream
608  * @pcm: the pcm instance
609  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
610  * @substream_count: the number of substreams
611  *
612  * Creates a new stream for the pcm.
613  * The corresponding stream on the pcm must have been empty before
614  * calling this, i.e. zero must be given to the argument of
615  * snd_pcm_new().
616  *
617  * Returns zero if successful, or a negative error code on failure.
618  */
619 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
620 {
621         int idx, err;
622         struct snd_pcm_str *pstr = &pcm->streams[stream];
623         struct snd_pcm_substream *substream, *prev;
624
625 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
626         mutex_init(&pstr->oss.setup_mutex);
627 #endif
628         pstr->stream = stream;
629         pstr->pcm = pcm;
630         pstr->substream_count = substream_count;
631         if (substream_count > 0) {
632                 err = snd_pcm_stream_proc_init(pstr);
633                 if (err < 0) {
634                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
635                         return err;
636                 }
637         }
638         prev = NULL;
639         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
640                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
641                 if (substream == NULL) {
642                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
643                         return -ENOMEM;
644                 }
645                 substream->pcm = pcm;
646                 substream->pstr = pstr;
647                 substream->number = idx;
648                 substream->stream = stream;
649                 sprintf(substream->name, "subdevice #%i", idx);
650                 snprintf(substream->latency_id, sizeof(substream->latency_id),
651                          "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
652                          (stream ? 'c' : 'p'), idx);
653                 substream->buffer_bytes_max = UINT_MAX;
654                 if (prev == NULL)
655                         pstr->substream = substream;
656                 else
657                         prev->next = substream;
658                 err = snd_pcm_substream_proc_init(substream);
659                 if (err < 0) {
660                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
661                         if (prev == NULL)
662                                 pstr->substream = NULL;
663                         else
664                                 prev->next = NULL;
665                         kfree(substream);
666                         return err;
667                 }
668                 substream->group = &substream->self_group;
669                 spin_lock_init(&substream->self_group.lock);
670                 INIT_LIST_HEAD(&substream->self_group.substreams);
671                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
672                 atomic_set(&substream->mmap_count, 0);
673                 prev = substream;
674         }
675         return 0;
676 }                               
677
678 EXPORT_SYMBOL(snd_pcm_new_stream);
679
680 /**
681  * snd_pcm_new - create a new PCM instance
682  * @card: the card instance
683  * @id: the id string
684  * @device: the device index (zero based)
685  * @playback_count: the number of substreams for playback
686  * @capture_count: the number of substreams for capture
687  * @rpcm: the pointer to store the new pcm instance
688  *
689  * Creates a new PCM instance.
690  *
691  * The pcm operators have to be set afterwards to the new instance
692  * via snd_pcm_set_ops().
693  *
694  * Returns zero if successful, or a negative error code on failure.
695  */
696 int snd_pcm_new(struct snd_card *card, const char *id, int device,
697                 int playback_count, int capture_count,
698                 struct snd_pcm ** rpcm)
699 {
700         struct snd_pcm *pcm;
701         int err;
702         static struct snd_device_ops ops = {
703                 .dev_free = snd_pcm_dev_free,
704                 .dev_register = snd_pcm_dev_register,
705                 .dev_disconnect = snd_pcm_dev_disconnect,
706         };
707
708         if (snd_BUG_ON(!card))
709                 return -ENXIO;
710         if (rpcm)
711                 *rpcm = NULL;
712         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
713         if (pcm == NULL) {
714                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
715                 return -ENOMEM;
716         }
717         pcm->card = card;
718         pcm->device = device;
719         if (id)
720                 strlcpy(pcm->id, id, sizeof(pcm->id));
721         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
722                 snd_pcm_free(pcm);
723                 return err;
724         }
725         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
726                 snd_pcm_free(pcm);
727                 return err;
728         }
729         mutex_init(&pcm->open_mutex);
730         init_waitqueue_head(&pcm->open_wait);
731         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
732                 snd_pcm_free(pcm);
733                 return err;
734         }
735         if (rpcm)
736                 *rpcm = pcm;
737         return 0;
738 }
739
740 EXPORT_SYMBOL(snd_pcm_new);
741
742 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
743 {
744         struct snd_pcm_substream *substream, *substream_next;
745 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
746         struct snd_pcm_oss_setup *setup, *setupn;
747 #endif
748         substream = pstr->substream;
749         while (substream) {
750                 substream_next = substream->next;
751                 snd_pcm_timer_done(substream);
752                 snd_pcm_substream_proc_done(substream);
753                 kfree(substream);
754                 substream = substream_next;
755         }
756         snd_pcm_stream_proc_done(pstr);
757 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
758         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
759                 setupn = setup->next;
760                 kfree(setup->task_name);
761                 kfree(setup);
762         }
763 #endif
764 }
765
766 static int snd_pcm_free(struct snd_pcm *pcm)
767 {
768         struct snd_pcm_notify *notify;
769
770         if (!pcm)
771                 return 0;
772         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
773                 notify->n_unregister(pcm);
774         }
775         if (pcm->private_free)
776                 pcm->private_free(pcm);
777         snd_pcm_lib_preallocate_free_for_all(pcm);
778         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
779         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
780         kfree(pcm);
781         return 0;
782 }
783
784 static int snd_pcm_dev_free(struct snd_device *device)
785 {
786         struct snd_pcm *pcm = device->device_data;
787         return snd_pcm_free(pcm);
788 }
789
790 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
791                              struct file *file,
792                              struct snd_pcm_substream **rsubstream)
793 {
794         struct snd_pcm_str * pstr;
795         struct snd_pcm_substream *substream;
796         struct snd_pcm_runtime *runtime;
797         struct snd_ctl_file *kctl;
798         struct snd_card *card;
799         int prefer_subdevice = -1;
800         size_t size;
801
802         if (snd_BUG_ON(!pcm || !rsubstream))
803                 return -ENXIO;
804         *rsubstream = NULL;
805         pstr = &pcm->streams[stream];
806         if (pstr->substream == NULL || pstr->substream_count == 0)
807                 return -ENODEV;
808
809         card = pcm->card;
810         read_lock(&card->ctl_files_rwlock);
811         list_for_each_entry(kctl, &card->ctl_files, list) {
812                 if (kctl->pid == current->pid) {
813                         prefer_subdevice = kctl->prefer_pcm_subdevice;
814                         if (prefer_subdevice != -1)
815                                 break;
816                 }
817         }
818         read_unlock(&card->ctl_files_rwlock);
819
820         switch (stream) {
821         case SNDRV_PCM_STREAM_PLAYBACK:
822                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
823                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
824                                 if (SUBSTREAM_BUSY(substream))
825                                         return -EAGAIN;
826                         }
827                 }
828                 break;
829         case SNDRV_PCM_STREAM_CAPTURE:
830                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
831                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
832                                 if (SUBSTREAM_BUSY(substream))
833                                         return -EAGAIN;
834                         }
835                 }
836                 break;
837         default:
838                 return -EINVAL;
839         }
840
841         if (file->f_flags & O_APPEND) {
842                 if (prefer_subdevice < 0) {
843                         if (pstr->substream_count > 1)
844                                 return -EINVAL; /* must be unique */
845                         substream = pstr->substream;
846                 } else {
847                         for (substream = pstr->substream; substream;
848                              substream = substream->next)
849                                 if (substream->number == prefer_subdevice)
850                                         break;
851                 }
852                 if (! substream)
853                         return -ENODEV;
854                 if (! SUBSTREAM_BUSY(substream))
855                         return -EBADFD;
856                 substream->ref_count++;
857                 *rsubstream = substream;
858                 return 0;
859         }
860
861         if (prefer_subdevice >= 0) {
862                 for (substream = pstr->substream; substream; substream = substream->next)
863                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
864                                 goto __ok;
865         }
866         for (substream = pstr->substream; substream; substream = substream->next)
867                 if (!SUBSTREAM_BUSY(substream))
868                         break;
869       __ok:
870         if (substream == NULL)
871                 return -EAGAIN;
872
873         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
874         if (runtime == NULL)
875                 return -ENOMEM;
876
877         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
878         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
879         if (runtime->status == NULL) {
880                 kfree(runtime);
881                 return -ENOMEM;
882         }
883         memset((void*)runtime->status, 0, size);
884
885         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
886         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
887         if (runtime->control == NULL) {
888                 snd_free_pages((void*)runtime->status,
889                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
890                 kfree(runtime);
891                 return -ENOMEM;
892         }
893         memset((void*)runtime->control, 0, size);
894
895         init_waitqueue_head(&runtime->sleep);
896
897         runtime->status->state = SNDRV_PCM_STATE_OPEN;
898
899         substream->runtime = runtime;
900         substream->private_data = pcm->private_data;
901         substream->ref_count = 1;
902         substream->f_flags = file->f_flags;
903         pstr->substream_opened++;
904         *rsubstream = substream;
905         return 0;
906 }
907
908 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
909 {
910         struct snd_pcm_runtime *runtime;
911
912         if (PCM_RUNTIME_CHECK(substream))
913                 return;
914         runtime = substream->runtime;
915         if (runtime->private_free != NULL)
916                 runtime->private_free(runtime);
917         snd_free_pages((void*)runtime->status,
918                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
919         snd_free_pages((void*)runtime->control,
920                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
921         kfree(runtime->hw_constraints.rules);
922         kfree(runtime);
923         substream->runtime = NULL;
924         substream->pstr->substream_opened--;
925 }
926
927 static ssize_t show_pcm_class(struct device *dev,
928                               struct device_attribute *attr, char *buf)
929 {
930         struct snd_pcm *pcm;
931         const char *str;
932         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
933                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
934                 [SNDRV_PCM_CLASS_MULTI] = "multi",
935                 [SNDRV_PCM_CLASS_MODEM] = "modem",
936                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
937         };
938
939         if (! (pcm = dev_get_drvdata(dev)) ||
940             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
941                 str = "none";
942         else
943                 str = strs[pcm->dev_class];
944         return snprintf(buf, PAGE_SIZE, "%s\n", str);
945 }
946
947 static struct device_attribute pcm_attrs =
948         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
949
950 static int snd_pcm_dev_register(struct snd_device *device)
951 {
952         int cidx, err;
953         struct snd_pcm_substream *substream;
954         struct snd_pcm_notify *notify;
955         char str[16];
956         struct snd_pcm *pcm;
957         struct device *dev;
958
959         if (snd_BUG_ON(!device || !device->device_data))
960                 return -ENXIO;
961         pcm = device->device_data;
962         mutex_lock(&register_mutex);
963         err = snd_pcm_add(pcm);
964         if (err) {
965                 mutex_unlock(&register_mutex);
966                 return err;
967         }
968         for (cidx = 0; cidx < 2; cidx++) {
969                 int devtype = -1;
970                 if (pcm->streams[cidx].substream == NULL)
971                         continue;
972                 switch (cidx) {
973                 case SNDRV_PCM_STREAM_PLAYBACK:
974                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
975                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
976                         break;
977                 case SNDRV_PCM_STREAM_CAPTURE:
978                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
979                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
980                         break;
981                 }
982                 /* device pointer to use, pcm->dev takes precedence if
983                  * it is assigned, otherwise fall back to card's device
984                  * if possible */
985                 dev = pcm->dev;
986                 if (!dev)
987                         dev = snd_card_get_device_link(pcm->card);
988                 /* register pcm */
989                 err = snd_register_device_for_dev(devtype, pcm->card,
990                                                   pcm->device,
991                                                   &snd_pcm_f_ops[cidx],
992                                                   pcm, str, dev);
993                 if (err < 0) {
994                         list_del(&pcm->list);
995                         mutex_unlock(&register_mutex);
996                         return err;
997                 }
998                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
999                                           &pcm_attrs);
1000                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1001                         snd_pcm_timer_init(substream);
1002         }
1003
1004         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1005                 notify->n_register(pcm);
1006
1007         mutex_unlock(&register_mutex);
1008         return 0;
1009 }
1010
1011 static int snd_pcm_dev_disconnect(struct snd_device *device)
1012 {
1013         struct snd_pcm *pcm = device->device_data;
1014         struct snd_pcm_notify *notify;
1015         struct snd_pcm_substream *substream;
1016         int cidx, devtype;
1017
1018         mutex_lock(&register_mutex);
1019         if (list_empty(&pcm->list))
1020                 goto unlock;
1021
1022         list_del_init(&pcm->list);
1023         for (cidx = 0; cidx < 2; cidx++)
1024                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1025                         if (substream->runtime)
1026                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1027         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1028                 notify->n_disconnect(pcm);
1029         }
1030         for (cidx = 0; cidx < 2; cidx++) {
1031                 devtype = -1;
1032                 switch (cidx) {
1033                 case SNDRV_PCM_STREAM_PLAYBACK:
1034                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1035                         break;
1036                 case SNDRV_PCM_STREAM_CAPTURE:
1037                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1038                         break;
1039                 }
1040                 snd_unregister_device(devtype, pcm->card, pcm->device);
1041         }
1042  unlock:
1043         mutex_unlock(&register_mutex);
1044         return 0;
1045 }
1046
1047 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1048 {
1049         struct snd_pcm *pcm;
1050
1051         if (snd_BUG_ON(!notify ||
1052                        !notify->n_register ||
1053                        !notify->n_unregister ||
1054                        !notify->n_disconnect))
1055                 return -EINVAL;
1056         mutex_lock(&register_mutex);
1057         if (nfree) {
1058                 list_del(&notify->list);
1059                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1060                         notify->n_unregister(pcm);
1061         } else {
1062                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1063                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1064                         notify->n_register(pcm);
1065         }
1066         mutex_unlock(&register_mutex);
1067         return 0;
1068 }
1069
1070 EXPORT_SYMBOL(snd_pcm_notify);
1071
1072 #ifdef CONFIG_PROC_FS
1073 /*
1074  *  Info interface
1075  */
1076
1077 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1078                               struct snd_info_buffer *buffer)
1079 {
1080         struct snd_pcm *pcm;
1081
1082         mutex_lock(&register_mutex);
1083         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1084                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1085                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1086                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1087                         snd_iprintf(buffer, " : playback %i",
1088                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1089                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1090                         snd_iprintf(buffer, " : capture %i",
1091                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1092                 snd_iprintf(buffer, "\n");
1093         }
1094         mutex_unlock(&register_mutex);
1095 }
1096
1097 static struct snd_info_entry *snd_pcm_proc_entry;
1098
1099 static void snd_pcm_proc_init(void)
1100 {
1101         struct snd_info_entry *entry;
1102
1103         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1104                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1105                 if (snd_info_register(entry) < 0) {
1106                         snd_info_free_entry(entry);
1107                         entry = NULL;
1108                 }
1109         }
1110         snd_pcm_proc_entry = entry;
1111 }
1112
1113 static void snd_pcm_proc_done(void)
1114 {
1115         snd_info_free_entry(snd_pcm_proc_entry);
1116 }
1117
1118 #else /* !CONFIG_PROC_FS */
1119 #define snd_pcm_proc_init()
1120 #define snd_pcm_proc_done()
1121 #endif /* CONFIG_PROC_FS */
1122
1123
1124 /*
1125  *  ENTRY functions
1126  */
1127
1128 static int __init alsa_pcm_init(void)
1129 {
1130         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1131         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1132         snd_pcm_proc_init();
1133         return 0;
1134 }
1135
1136 static void __exit alsa_pcm_exit(void)
1137 {
1138         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1139         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1140         snd_pcm_proc_done();
1141 }
1142
1143 module_init(alsa_pcm_init)
1144 module_exit(alsa_pcm_exit)