Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Initialization routines | |
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/sched.h> | |
25 | #include <linux/file.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/ctype.h> | |
29 | #include <linux/pci.h> | |
30 | #include <linux/pm.h> | |
d052d1be | 31 | |
1da177e4 LT |
32 | #include <sound/core.h> |
33 | #include <sound/control.h> | |
34 | #include <sound/info.h> | |
35 | ||
36 | struct snd_shutdown_f_ops { | |
37 | struct file_operations f_ops; | |
38 | struct snd_shutdown_f_ops *next; | |
39 | }; | |
40 | ||
41 | unsigned int snd_cards_lock = 0; /* locked for registering/using */ | |
512bbd6a | 42 | struct snd_card *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL}; |
1da177e4 LT |
43 | DEFINE_RWLOCK(snd_card_rwlock); |
44 | ||
45 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
512bbd6a | 46 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
1da177e4 LT |
47 | #endif |
48 | ||
e28563cc | 49 | #ifdef CONFIG_PROC_FS |
512bbd6a TI |
50 | static void snd_card_id_read(struct snd_info_entry *entry, |
51 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
52 | { |
53 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
54 | } | |
55 | ||
e28563cc TI |
56 | static inline int init_info_for_card(struct snd_card *card) |
57 | { | |
58 | int err; | |
59 | struct snd_info_entry *entry; | |
60 | ||
61 | if ((err = snd_info_card_register(card)) < 0) { | |
62 | snd_printd("unable to create card info\n"); | |
63 | return err; | |
64 | } | |
65 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
66 | snd_printd("unable to create card entry\n"); | |
67 | return err; | |
68 | } | |
69 | entry->c.text.read_size = PAGE_SIZE; | |
70 | entry->c.text.read = snd_card_id_read; | |
71 | if (snd_info_register(entry) < 0) { | |
72 | snd_info_free_entry(entry); | |
73 | entry = NULL; | |
74 | } | |
75 | card->proc_id = entry; | |
76 | return 0; | |
77 | } | |
78 | #else /* !CONFIG_PROC_FS */ | |
79 | #define init_info_for_card(card) | |
80 | #endif | |
81 | ||
1da177e4 LT |
82 | static void snd_card_free_thread(void * __card); |
83 | ||
84 | /** | |
85 | * snd_card_new - create and initialize a soundcard structure | |
86 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
87 | * @xid: card identification (ASCII string) | |
88 | * @module: top level module for locking | |
89 | * @extra_size: allocate this extra size after the main soundcard structure | |
90 | * | |
91 | * Creates and initializes a soundcard structure. | |
92 | * | |
512bbd6a | 93 | * Returns kmallocated snd_card structure. Creates the ALSA control interface |
1da177e4 LT |
94 | * (which is blocked until snd_card_register function is called). |
95 | */ | |
512bbd6a | 96 | struct snd_card *snd_card_new(int idx, const char *xid, |
1da177e4 LT |
97 | struct module *module, int extra_size) |
98 | { | |
512bbd6a | 99 | struct snd_card *card; |
1da177e4 LT |
100 | int err; |
101 | ||
102 | if (extra_size < 0) | |
103 | extra_size = 0; | |
ca2c0966 | 104 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
1da177e4 LT |
105 | if (card == NULL) |
106 | return NULL; | |
107 | if (xid) { | |
108 | if (!snd_info_check_reserved_words(xid)) | |
109 | goto __error; | |
110 | strlcpy(card->id, xid, sizeof(card->id)); | |
111 | } | |
112 | err = 0; | |
113 | write_lock(&snd_card_rwlock); | |
114 | if (idx < 0) { | |
115 | int idx2; | |
116 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
117 | if (~snd_cards_lock & idx & 1<<idx2) { | |
118 | idx = idx2; | |
119 | if (idx >= snd_ecards_limit) | |
120 | snd_ecards_limit = idx + 1; | |
121 | break; | |
122 | } | |
123 | } else if (idx < snd_ecards_limit) { | |
124 | if (snd_cards_lock & (1 << idx)) | |
125 | err = -ENODEV; /* invalid */ | |
126 | } else if (idx < SNDRV_CARDS) | |
127 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
128 | else | |
129 | err = -ENODEV; | |
130 | if (idx < 0 || err < 0) { | |
131 | write_unlock(&snd_card_rwlock); | |
132 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); | |
133 | goto __error; | |
134 | } | |
135 | snd_cards_lock |= 1 << idx; /* lock it */ | |
136 | write_unlock(&snd_card_rwlock); | |
137 | card->number = idx; | |
138 | card->module = module; | |
139 | INIT_LIST_HEAD(&card->devices); | |
140 | init_rwsem(&card->controls_rwsem); | |
141 | rwlock_init(&card->ctl_files_rwlock); | |
142 | INIT_LIST_HEAD(&card->controls); | |
143 | INIT_LIST_HEAD(&card->ctl_files); | |
144 | spin_lock_init(&card->files_lock); | |
145 | init_waitqueue_head(&card->shutdown_sleep); | |
146 | INIT_WORK(&card->free_workq, snd_card_free_thread, card); | |
147 | #ifdef CONFIG_PM | |
1a60d4c5 | 148 | mutex_init(&card->power_lock); |
1da177e4 LT |
149 | init_waitqueue_head(&card->power_sleep); |
150 | #endif | |
151 | /* the control interface cannot be accessed from the user space until */ | |
152 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
153 | if ((err = snd_ctl_create(card)) < 0) { | |
154 | snd_printd("unable to register control minors\n"); | |
155 | goto __error; | |
156 | } | |
157 | if ((err = snd_info_card_create(card)) < 0) { | |
158 | snd_printd("unable to create card info\n"); | |
159 | goto __error_ctl; | |
160 | } | |
161 | if (extra_size > 0) | |
512bbd6a | 162 | card->private_data = (char *)card + sizeof(struct snd_card); |
1da177e4 LT |
163 | return card; |
164 | ||
165 | __error_ctl: | |
166 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
167 | __error: | |
168 | kfree(card); | |
169 | return NULL; | |
170 | } | |
171 | ||
172 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) | |
173 | { | |
174 | return POLLERR | POLLNVAL; | |
175 | } | |
176 | ||
177 | /** | |
178 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
179 | * @card: soundcard structure | |
180 | * | |
181 | * Disconnects all APIs from the file-operations (user space). | |
182 | * | |
183 | * Returns zero, otherwise a negative error code. | |
184 | * | |
185 | * Note: The current implementation replaces all active file->f_op with special | |
186 | * dummy file operations (they do nothing except release). | |
187 | */ | |
512bbd6a | 188 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
189 | { |
190 | struct snd_monitor_file *mfile; | |
191 | struct file *file; | |
192 | struct snd_shutdown_f_ops *s_f_ops; | |
193 | struct file_operations *f_ops, *old_f_ops; | |
194 | int err; | |
195 | ||
196 | spin_lock(&card->files_lock); | |
197 | if (card->shutdown) { | |
198 | spin_unlock(&card->files_lock); | |
199 | return 0; | |
200 | } | |
201 | card->shutdown = 1; | |
202 | spin_unlock(&card->files_lock); | |
203 | ||
204 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
205 | write_lock(&snd_card_rwlock); | |
206 | snd_cards[card->number] = NULL; | |
207 | write_unlock(&snd_card_rwlock); | |
208 | ||
209 | /* phase 2: replace file->f_op with special dummy operations */ | |
210 | ||
211 | spin_lock(&card->files_lock); | |
212 | mfile = card->files; | |
213 | while (mfile) { | |
214 | file = mfile->file; | |
215 | ||
216 | /* it's critical part, use endless loop */ | |
217 | /* we have no room to fail */ | |
218 | s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); | |
219 | if (s_f_ops == NULL) | |
220 | panic("Atomic allocation failed for snd_shutdown_f_ops!"); | |
221 | ||
222 | f_ops = &s_f_ops->f_ops; | |
223 | ||
224 | memset(f_ops, 0, sizeof(*f_ops)); | |
225 | f_ops->owner = file->f_op->owner; | |
226 | f_ops->release = file->f_op->release; | |
227 | f_ops->poll = snd_disconnect_poll; | |
228 | ||
229 | s_f_ops->next = card->s_f_ops; | |
230 | card->s_f_ops = s_f_ops; | |
231 | ||
232 | f_ops = fops_get(f_ops); | |
233 | ||
234 | old_f_ops = file->f_op; | |
235 | file->f_op = f_ops; /* must be atomic */ | |
236 | fops_put(old_f_ops); | |
237 | ||
238 | mfile = mfile->next; | |
239 | } | |
240 | spin_unlock(&card->files_lock); | |
241 | ||
242 | /* phase 3: notify all connected devices about disconnection */ | |
243 | /* at this point, they cannot respond to any calls except release() */ | |
244 | ||
245 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
246 | if (snd_mixer_oss_notify_callback) | |
247 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
248 | #endif | |
249 | ||
250 | /* notify all devices that we are disconnected */ | |
251 | err = snd_device_disconnect_all(card); | |
252 | if (err < 0) | |
253 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
1da177e4 LT |
258 | /** |
259 | * snd_card_free - frees given soundcard structure | |
260 | * @card: soundcard structure | |
261 | * | |
262 | * This function releases the soundcard structure and the all assigned | |
263 | * devices automatically. That is, you don't have to release the devices | |
264 | * by yourself. | |
265 | * | |
266 | * Returns zero. Frees all associated devices and frees the control | |
267 | * interface associated to given soundcard. | |
268 | */ | |
512bbd6a | 269 | int snd_card_free(struct snd_card *card) |
1da177e4 LT |
270 | { |
271 | struct snd_shutdown_f_ops *s_f_ops; | |
272 | ||
273 | if (card == NULL) | |
274 | return -EINVAL; | |
275 | write_lock(&snd_card_rwlock); | |
276 | snd_cards[card->number] = NULL; | |
277 | write_unlock(&snd_card_rwlock); | |
278 | ||
279 | #ifdef CONFIG_PM | |
280 | wake_up(&card->power_sleep); | |
1da177e4 | 281 | #endif |
1da177e4 LT |
282 | /* wait, until all devices are ready for the free operation */ |
283 | wait_event(card->shutdown_sleep, card->files == NULL); | |
284 | ||
285 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
286 | if (snd_mixer_oss_notify_callback) | |
287 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
288 | #endif | |
289 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
290 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
291 | /* Fatal, but this situation should never occur */ | |
292 | } | |
293 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
294 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
295 | /* Fatal, but this situation should never occur */ | |
296 | } | |
297 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
298 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
299 | /* Fatal, but this situation should never occur */ | |
300 | } | |
301 | if (card->private_free) | |
302 | card->private_free(card); | |
e28563cc | 303 | snd_info_unregister(card->proc_id); |
1da177e4 LT |
304 | if (snd_info_card_free(card) < 0) { |
305 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
306 | /* Not fatal error */ | |
307 | } | |
308 | while (card->s_f_ops) { | |
309 | s_f_ops = card->s_f_ops; | |
310 | card->s_f_ops = s_f_ops->next; | |
311 | kfree(s_f_ops); | |
312 | } | |
313 | write_lock(&snd_card_rwlock); | |
314 | snd_cards_lock &= ~(1 << card->number); | |
315 | write_unlock(&snd_card_rwlock); | |
316 | kfree(card); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static void snd_card_free_thread(void * __card) | |
321 | { | |
512bbd6a | 322 | struct snd_card *card = __card; |
1da177e4 LT |
323 | struct module * module = card->module; |
324 | ||
325 | if (!try_module_get(module)) { | |
326 | snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); | |
327 | module = NULL; | |
328 | } | |
329 | ||
330 | snd_card_free(card); | |
331 | ||
332 | module_put(module); | |
333 | } | |
334 | ||
335 | /** | |
336 | * snd_card_free_in_thread - call snd_card_free() in thread | |
337 | * @card: soundcard structure | |
338 | * | |
339 | * This function schedules the call of snd_card_free() function in a | |
340 | * work queue. When all devices are released (non-busy), the work | |
341 | * is woken up and calls snd_card_free(). | |
342 | * | |
343 | * When a card can be disconnected at any time by hotplug service, | |
344 | * this function should be used in disconnect (or detach) callback | |
345 | * instead of calling snd_card_free() directly. | |
346 | * | |
347 | * Returns - zero otherwise a negative error code if the start of thread failed. | |
348 | */ | |
512bbd6a | 349 | int snd_card_free_in_thread(struct snd_card *card) |
1da177e4 LT |
350 | { |
351 | if (card->files == NULL) { | |
352 | snd_card_free(card); | |
353 | return 0; | |
354 | } | |
355 | ||
356 | if (schedule_work(&card->free_workq)) | |
357 | return 0; | |
358 | ||
359 | snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); | |
360 | /* try to free the structure immediately */ | |
361 | snd_card_free(card); | |
362 | return -EFAULT; | |
363 | } | |
364 | ||
512bbd6a | 365 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 366 | { |
d001544d | 367 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
368 | char *id, *spos; |
369 | ||
370 | id = spos = card->shortname; | |
371 | while (*id != '\0') { | |
372 | if (*id == ' ') | |
373 | spos = id + 1; | |
374 | id++; | |
375 | } | |
376 | id = card->id; | |
377 | while (*spos != '\0' && !isalnum(*spos)) | |
378 | spos++; | |
379 | if (isdigit(*spos)) | |
380 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
381 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
382 | if (isalnum(*spos)) | |
383 | *id++ = *spos; | |
384 | spos++; | |
385 | } | |
386 | *id = '\0'; | |
387 | ||
388 | id = card->id; | |
389 | ||
390 | if (*id == '\0') | |
391 | strcpy(id, "default"); | |
392 | ||
393 | while (1) { | |
394 | if (loops-- == 0) { | |
395 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
396 | strcpy(card->id, card->proc_root->name); | |
397 | return; | |
398 | } | |
399 | if (!snd_info_check_reserved_words(id)) | |
400 | goto __change; | |
401 | for (i = 0; i < snd_ecards_limit; i++) { | |
402 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
403 | goto __change; | |
404 | } | |
405 | break; | |
406 | ||
407 | __change: | |
408 | len = strlen(id); | |
d001544d CL |
409 | if (idx_flag) { |
410 | if (id[len-1] != '9') | |
411 | id[len-1]++; | |
412 | else | |
413 | id[len-1] = 'A'; | |
414 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
415 | strcat(id, "_1"); |
416 | idx_flag++; | |
417 | } else { | |
418 | spos = id + len - 2; | |
419 | if ((size_t)len <= sizeof(card->id) - 2) | |
420 | spos++; | |
421 | *spos++ = '_'; | |
422 | *spos++ = '1'; | |
423 | *spos++ = '\0'; | |
424 | idx_flag++; | |
425 | } | |
426 | } | |
427 | } | |
428 | ||
429 | /** | |
430 | * snd_card_register - register the soundcard | |
431 | * @card: soundcard structure | |
432 | * | |
433 | * This function registers all the devices assigned to the soundcard. | |
434 | * Until calling this, the ALSA control interface is blocked from the | |
435 | * external accesses. Thus, you should call this function at the end | |
436 | * of the initialization of the card. | |
437 | * | |
438 | * Returns zero otherwise a negative error code if the registrain failed. | |
439 | */ | |
512bbd6a | 440 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
441 | { |
442 | int err; | |
1da177e4 | 443 | |
7c22f1aa | 444 | snd_assert(card != NULL, return -EINVAL); |
1da177e4 LT |
445 | if ((err = snd_device_register_all(card)) < 0) |
446 | return err; | |
447 | write_lock(&snd_card_rwlock); | |
448 | if (snd_cards[card->number]) { | |
449 | /* already registered */ | |
450 | write_unlock(&snd_card_rwlock); | |
451 | return 0; | |
452 | } | |
453 | if (card->id[0] == '\0') | |
454 | choose_default_id(card); | |
455 | snd_cards[card->number] = card; | |
456 | write_unlock(&snd_card_rwlock); | |
e28563cc | 457 | init_info_for_card(card); |
1da177e4 LT |
458 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
459 | if (snd_mixer_oss_notify_callback) | |
460 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
461 | #endif | |
462 | return 0; | |
463 | } | |
464 | ||
e28563cc | 465 | #ifdef CONFIG_PROC_FS |
512bbd6a | 466 | static struct snd_info_entry *snd_card_info_entry = NULL; |
1da177e4 | 467 | |
a381a7a6 TI |
468 | static void snd_card_info_read(struct snd_info_entry *entry, |
469 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
470 | { |
471 | int idx, count; | |
512bbd6a | 472 | struct snd_card *card; |
1da177e4 LT |
473 | |
474 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
475 | read_lock(&snd_card_rwlock); | |
476 | if ((card = snd_cards[idx]) != NULL) { | |
477 | count++; | |
d001544d | 478 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
479 | idx, |
480 | card->id, | |
481 | card->driver, | |
482 | card->shortname); | |
d001544d | 483 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
484 | card->longname); |
485 | } | |
486 | read_unlock(&snd_card_rwlock); | |
487 | } | |
488 | if (!count) | |
489 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
490 | } | |
491 | ||
e28563cc | 492 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 493 | |
512bbd6a | 494 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
495 | { |
496 | int idx, count; | |
512bbd6a | 497 | struct snd_card *card; |
1da177e4 LT |
498 | |
499 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
500 | read_lock(&snd_card_rwlock); | |
501 | if ((card = snd_cards[idx]) != NULL) { | |
502 | count++; | |
503 | snd_iprintf(buffer, "%s\n", card->longname); | |
504 | } | |
505 | read_unlock(&snd_card_rwlock); | |
506 | } | |
507 | if (!count) { | |
508 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
509 | } | |
510 | } | |
511 | ||
512 | #endif | |
513 | ||
514 | #ifdef MODULE | |
512bbd6a TI |
515 | static struct snd_info_entry *snd_card_module_info_entry; |
516 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
517 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
518 | { |
519 | int idx; | |
512bbd6a | 520 | struct snd_card *card; |
1da177e4 LT |
521 | |
522 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
523 | read_lock(&snd_card_rwlock); | |
524 | if ((card = snd_cards[idx]) != NULL) | |
d001544d CL |
525 | snd_iprintf(buffer, "%2i %s\n", |
526 | idx, card->module->name); | |
1da177e4 LT |
527 | read_unlock(&snd_card_rwlock); |
528 | } | |
529 | } | |
530 | #endif | |
531 | ||
532 | int __init snd_card_info_init(void) | |
533 | { | |
512bbd6a | 534 | struct snd_info_entry *entry; |
1da177e4 LT |
535 | |
536 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
537 | if (! entry) |
538 | return -ENOMEM; | |
1da177e4 LT |
539 | entry->c.text.read_size = PAGE_SIZE; |
540 | entry->c.text.read = snd_card_info_read; | |
541 | if (snd_info_register(entry) < 0) { | |
542 | snd_info_free_entry(entry); | |
543 | return -ENOMEM; | |
544 | } | |
545 | snd_card_info_entry = entry; | |
546 | ||
547 | #ifdef MODULE | |
548 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
549 | if (entry) { | |
550 | entry->c.text.read_size = PAGE_SIZE; | |
551 | entry->c.text.read = snd_card_module_info_read; | |
552 | if (snd_info_register(entry) < 0) | |
553 | snd_info_free_entry(entry); | |
554 | else | |
555 | snd_card_module_info_entry = entry; | |
556 | } | |
557 | #endif | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | int __exit snd_card_info_done(void) | |
563 | { | |
e28563cc | 564 | snd_info_unregister(snd_card_info_entry); |
1da177e4 | 565 | #ifdef MODULE |
e28563cc | 566 | snd_info_unregister(snd_card_module_info_entry); |
1da177e4 LT |
567 | #endif |
568 | return 0; | |
569 | } | |
570 | ||
e28563cc TI |
571 | #endif /* CONFIG_PROC_FS */ |
572 | ||
1da177e4 LT |
573 | /** |
574 | * snd_component_add - add a component string | |
575 | * @card: soundcard structure | |
576 | * @component: the component id string | |
577 | * | |
578 | * This function adds the component id string to the supported list. | |
579 | * The component can be referred from the alsa-lib. | |
580 | * | |
581 | * Returns zero otherwise a negative error code. | |
582 | */ | |
583 | ||
512bbd6a | 584 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
585 | { |
586 | char *ptr; | |
587 | int len = strlen(component); | |
588 | ||
589 | ptr = strstr(card->components, component); | |
590 | if (ptr != NULL) { | |
591 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
592 | return 1; | |
593 | } | |
594 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
595 | snd_BUG(); | |
596 | return -ENOMEM; | |
597 | } | |
598 | if (card->components[0] != '\0') | |
599 | strcat(card->components, " "); | |
600 | strcat(card->components, component); | |
601 | return 0; | |
602 | } | |
603 | ||
604 | /** | |
605 | * snd_card_file_add - add the file to the file list of the card | |
606 | * @card: soundcard structure | |
607 | * @file: file pointer | |
608 | * | |
609 | * This function adds the file to the file linked-list of the card. | |
610 | * This linked-list is used to keep tracking the connection state, | |
611 | * and to avoid the release of busy resources by hotplug. | |
612 | * | |
613 | * Returns zero or a negative error code. | |
614 | */ | |
512bbd6a | 615 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
616 | { |
617 | struct snd_monitor_file *mfile; | |
618 | ||
619 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
620 | if (mfile == NULL) | |
621 | return -ENOMEM; | |
622 | mfile->file = file; | |
623 | mfile->next = NULL; | |
624 | spin_lock(&card->files_lock); | |
625 | if (card->shutdown) { | |
626 | spin_unlock(&card->files_lock); | |
627 | kfree(mfile); | |
628 | return -ENODEV; | |
629 | } | |
630 | mfile->next = card->files; | |
631 | card->files = mfile; | |
632 | spin_unlock(&card->files_lock); | |
633 | return 0; | |
634 | } | |
635 | ||
636 | /** | |
637 | * snd_card_file_remove - remove the file from the file list | |
638 | * @card: soundcard structure | |
639 | * @file: file pointer | |
640 | * | |
641 | * This function removes the file formerly added to the card via | |
642 | * snd_card_file_add() function. | |
643 | * If all files are removed and the release of the card is | |
644 | * scheduled, it will wake up the the thread to call snd_card_free() | |
645 | * (see snd_card_free_in_thread() function). | |
646 | * | |
647 | * Returns zero or a negative error code. | |
648 | */ | |
512bbd6a | 649 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
650 | { |
651 | struct snd_monitor_file *mfile, *pfile = NULL; | |
652 | ||
653 | spin_lock(&card->files_lock); | |
654 | mfile = card->files; | |
655 | while (mfile) { | |
656 | if (mfile->file == file) { | |
657 | if (pfile) | |
658 | pfile->next = mfile->next; | |
659 | else | |
660 | card->files = mfile->next; | |
661 | break; | |
662 | } | |
663 | pfile = mfile; | |
664 | mfile = mfile->next; | |
665 | } | |
666 | spin_unlock(&card->files_lock); | |
667 | if (card->files == NULL) | |
668 | wake_up(&card->shutdown_sleep); | |
669 | if (!mfile) { | |
670 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
671 | return -ENOENT; | |
672 | } | |
673 | kfree(mfile); | |
674 | return 0; | |
675 | } | |
676 | ||
677 | #ifdef CONFIG_PM | |
678 | /** | |
679 | * snd_power_wait - wait until the power-state is changed. | |
680 | * @card: soundcard structure | |
681 | * @power_state: expected power state | |
682 | * @file: file structure for the O_NONBLOCK check (optional) | |
683 | * | |
684 | * Waits until the power-state is changed. | |
685 | * | |
686 | * Note: the power lock must be active before call. | |
687 | */ | |
512bbd6a | 688 | int snd_power_wait(struct snd_card *card, unsigned int power_state, struct file *file) |
1da177e4 LT |
689 | { |
690 | wait_queue_t wait; | |
691 | int result = 0; | |
692 | ||
693 | /* fastpath */ | |
694 | if (snd_power_get_state(card) == power_state) | |
695 | return 0; | |
696 | init_waitqueue_entry(&wait, current); | |
697 | add_wait_queue(&card->power_sleep, &wait); | |
698 | while (1) { | |
699 | if (card->shutdown) { | |
700 | result = -ENODEV; | |
701 | break; | |
702 | } | |
703 | if (snd_power_get_state(card) == power_state) | |
704 | break; | |
705 | #if 0 /* block all devices */ | |
706 | if (file && (file->f_flags & O_NONBLOCK)) { | |
707 | result = -EAGAIN; | |
708 | break; | |
709 | } | |
710 | #endif | |
711 | set_current_state(TASK_UNINTERRUPTIBLE); | |
712 | snd_power_unlock(card); | |
713 | schedule_timeout(30 * HZ); | |
714 | snd_power_lock(card); | |
715 | } | |
716 | remove_wait_queue(&card->power_sleep, &wait); | |
717 | return result; | |
718 | } | |
719 | ||
1da177e4 | 720 | #endif /* CONFIG_PM */ |