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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> | |
31 | #include <sound/core.h> | |
32 | #include <sound/control.h> | |
33 | #include <sound/info.h> | |
34 | ||
35 | struct snd_shutdown_f_ops { | |
36 | struct file_operations f_ops; | |
37 | struct snd_shutdown_f_ops *next; | |
38 | }; | |
39 | ||
40 | unsigned int snd_cards_lock = 0; /* locked for registering/using */ | |
41 | snd_card_t *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL}; | |
42 | DEFINE_RWLOCK(snd_card_rwlock); | |
43 | ||
44 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
45 | int (*snd_mixer_oss_notify_callback)(snd_card_t *card, int free_flag); | |
46 | #endif | |
47 | ||
48 | static void snd_card_id_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) | |
49 | { | |
50 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
51 | } | |
52 | ||
53 | static void snd_card_free_thread(void * __card); | |
54 | ||
55 | /** | |
56 | * snd_card_new - create and initialize a soundcard structure | |
57 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
58 | * @xid: card identification (ASCII string) | |
59 | * @module: top level module for locking | |
60 | * @extra_size: allocate this extra size after the main soundcard structure | |
61 | * | |
62 | * Creates and initializes a soundcard structure. | |
63 | * | |
64 | * Returns kmallocated snd_card_t structure. Creates the ALSA control interface | |
65 | * (which is blocked until snd_card_register function is called). | |
66 | */ | |
67 | snd_card_t *snd_card_new(int idx, const char *xid, | |
68 | struct module *module, int extra_size) | |
69 | { | |
70 | snd_card_t *card; | |
71 | int err; | |
72 | ||
73 | if (extra_size < 0) | |
74 | extra_size = 0; | |
75 | card = kcalloc(1, sizeof(*card) + extra_size, GFP_KERNEL); | |
76 | if (card == NULL) | |
77 | return NULL; | |
78 | if (xid) { | |
79 | if (!snd_info_check_reserved_words(xid)) | |
80 | goto __error; | |
81 | strlcpy(card->id, xid, sizeof(card->id)); | |
82 | } | |
83 | err = 0; | |
84 | write_lock(&snd_card_rwlock); | |
85 | if (idx < 0) { | |
86 | int idx2; | |
87 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
88 | if (~snd_cards_lock & idx & 1<<idx2) { | |
89 | idx = idx2; | |
90 | if (idx >= snd_ecards_limit) | |
91 | snd_ecards_limit = idx + 1; | |
92 | break; | |
93 | } | |
94 | } else if (idx < snd_ecards_limit) { | |
95 | if (snd_cards_lock & (1 << idx)) | |
96 | err = -ENODEV; /* invalid */ | |
97 | } else if (idx < SNDRV_CARDS) | |
98 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
99 | else | |
100 | err = -ENODEV; | |
101 | if (idx < 0 || err < 0) { | |
102 | write_unlock(&snd_card_rwlock); | |
103 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); | |
104 | goto __error; | |
105 | } | |
106 | snd_cards_lock |= 1 << idx; /* lock it */ | |
107 | write_unlock(&snd_card_rwlock); | |
108 | card->number = idx; | |
109 | card->module = module; | |
110 | INIT_LIST_HEAD(&card->devices); | |
111 | init_rwsem(&card->controls_rwsem); | |
112 | rwlock_init(&card->ctl_files_rwlock); | |
113 | INIT_LIST_HEAD(&card->controls); | |
114 | INIT_LIST_HEAD(&card->ctl_files); | |
115 | spin_lock_init(&card->files_lock); | |
116 | init_waitqueue_head(&card->shutdown_sleep); | |
117 | INIT_WORK(&card->free_workq, snd_card_free_thread, card); | |
118 | #ifdef CONFIG_PM | |
119 | init_MUTEX(&card->power_lock); | |
120 | init_waitqueue_head(&card->power_sleep); | |
121 | #endif | |
122 | /* the control interface cannot be accessed from the user space until */ | |
123 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
124 | if ((err = snd_ctl_create(card)) < 0) { | |
125 | snd_printd("unable to register control minors\n"); | |
126 | goto __error; | |
127 | } | |
128 | if ((err = snd_info_card_create(card)) < 0) { | |
129 | snd_printd("unable to create card info\n"); | |
130 | goto __error_ctl; | |
131 | } | |
132 | if (extra_size > 0) | |
133 | card->private_data = (char *)card + sizeof(snd_card_t); | |
134 | return card; | |
135 | ||
136 | __error_ctl: | |
137 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
138 | __error: | |
139 | kfree(card); | |
140 | return NULL; | |
141 | } | |
142 | ||
143 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) | |
144 | { | |
145 | return POLLERR | POLLNVAL; | |
146 | } | |
147 | ||
148 | /** | |
149 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
150 | * @card: soundcard structure | |
151 | * | |
152 | * Disconnects all APIs from the file-operations (user space). | |
153 | * | |
154 | * Returns zero, otherwise a negative error code. | |
155 | * | |
156 | * Note: The current implementation replaces all active file->f_op with special | |
157 | * dummy file operations (they do nothing except release). | |
158 | */ | |
159 | int snd_card_disconnect(snd_card_t * card) | |
160 | { | |
161 | struct snd_monitor_file *mfile; | |
162 | struct file *file; | |
163 | struct snd_shutdown_f_ops *s_f_ops; | |
164 | struct file_operations *f_ops, *old_f_ops; | |
165 | int err; | |
166 | ||
167 | spin_lock(&card->files_lock); | |
168 | if (card->shutdown) { | |
169 | spin_unlock(&card->files_lock); | |
170 | return 0; | |
171 | } | |
172 | card->shutdown = 1; | |
173 | spin_unlock(&card->files_lock); | |
174 | ||
175 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
176 | write_lock(&snd_card_rwlock); | |
177 | snd_cards[card->number] = NULL; | |
178 | write_unlock(&snd_card_rwlock); | |
179 | ||
180 | /* phase 2: replace file->f_op with special dummy operations */ | |
181 | ||
182 | spin_lock(&card->files_lock); | |
183 | mfile = card->files; | |
184 | while (mfile) { | |
185 | file = mfile->file; | |
186 | ||
187 | /* it's critical part, use endless loop */ | |
188 | /* we have no room to fail */ | |
189 | s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); | |
190 | if (s_f_ops == NULL) | |
191 | panic("Atomic allocation failed for snd_shutdown_f_ops!"); | |
192 | ||
193 | f_ops = &s_f_ops->f_ops; | |
194 | ||
195 | memset(f_ops, 0, sizeof(*f_ops)); | |
196 | f_ops->owner = file->f_op->owner; | |
197 | f_ops->release = file->f_op->release; | |
198 | f_ops->poll = snd_disconnect_poll; | |
199 | ||
200 | s_f_ops->next = card->s_f_ops; | |
201 | card->s_f_ops = s_f_ops; | |
202 | ||
203 | f_ops = fops_get(f_ops); | |
204 | ||
205 | old_f_ops = file->f_op; | |
206 | file->f_op = f_ops; /* must be atomic */ | |
207 | fops_put(old_f_ops); | |
208 | ||
209 | mfile = mfile->next; | |
210 | } | |
211 | spin_unlock(&card->files_lock); | |
212 | ||
213 | /* phase 3: notify all connected devices about disconnection */ | |
214 | /* at this point, they cannot respond to any calls except release() */ | |
215 | ||
216 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
217 | if (snd_mixer_oss_notify_callback) | |
218 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
219 | #endif | |
220 | ||
221 | /* notify all devices that we are disconnected */ | |
222 | err = snd_device_disconnect_all(card); | |
223 | if (err < 0) | |
224 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | #if defined(CONFIG_PM) && defined(CONFIG_SND_GENERIC_PM) | |
230 | static void snd_generic_device_unregister(struct snd_generic_device *dev); | |
231 | #endif | |
232 | ||
233 | /** | |
234 | * snd_card_free - frees given soundcard structure | |
235 | * @card: soundcard structure | |
236 | * | |
237 | * This function releases the soundcard structure and the all assigned | |
238 | * devices automatically. That is, you don't have to release the devices | |
239 | * by yourself. | |
240 | * | |
241 | * Returns zero. Frees all associated devices and frees the control | |
242 | * interface associated to given soundcard. | |
243 | */ | |
244 | int snd_card_free(snd_card_t * card) | |
245 | { | |
246 | struct snd_shutdown_f_ops *s_f_ops; | |
247 | ||
248 | if (card == NULL) | |
249 | return -EINVAL; | |
250 | write_lock(&snd_card_rwlock); | |
251 | snd_cards[card->number] = NULL; | |
252 | write_unlock(&snd_card_rwlock); | |
253 | ||
254 | #ifdef CONFIG_PM | |
255 | wake_up(&card->power_sleep); | |
256 | #ifdef CONFIG_SND_GENERIC_PM | |
257 | if (card->pm_dev) { | |
258 | snd_generic_device_unregister(card->pm_dev); | |
259 | card->pm_dev = NULL; | |
260 | } | |
261 | #endif | |
262 | #endif | |
263 | ||
264 | /* wait, until all devices are ready for the free operation */ | |
265 | wait_event(card->shutdown_sleep, card->files == NULL); | |
266 | ||
267 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
268 | if (snd_mixer_oss_notify_callback) | |
269 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
270 | #endif | |
271 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
272 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
273 | /* Fatal, but this situation should never occur */ | |
274 | } | |
275 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
276 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
277 | /* Fatal, but this situation should never occur */ | |
278 | } | |
279 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
280 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
281 | /* Fatal, but this situation should never occur */ | |
282 | } | |
283 | if (card->private_free) | |
284 | card->private_free(card); | |
285 | if (card->proc_id) | |
286 | snd_info_unregister(card->proc_id); | |
287 | if (snd_info_card_free(card) < 0) { | |
288 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
289 | /* Not fatal error */ | |
290 | } | |
291 | while (card->s_f_ops) { | |
292 | s_f_ops = card->s_f_ops; | |
293 | card->s_f_ops = s_f_ops->next; | |
294 | kfree(s_f_ops); | |
295 | } | |
296 | write_lock(&snd_card_rwlock); | |
297 | snd_cards_lock &= ~(1 << card->number); | |
298 | write_unlock(&snd_card_rwlock); | |
299 | kfree(card); | |
300 | return 0; | |
301 | } | |
302 | ||
303 | static void snd_card_free_thread(void * __card) | |
304 | { | |
305 | snd_card_t *card = __card; | |
306 | struct module * module = card->module; | |
307 | ||
308 | if (!try_module_get(module)) { | |
309 | snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); | |
310 | module = NULL; | |
311 | } | |
312 | ||
313 | snd_card_free(card); | |
314 | ||
315 | module_put(module); | |
316 | } | |
317 | ||
318 | /** | |
319 | * snd_card_free_in_thread - call snd_card_free() in thread | |
320 | * @card: soundcard structure | |
321 | * | |
322 | * This function schedules the call of snd_card_free() function in a | |
323 | * work queue. When all devices are released (non-busy), the work | |
324 | * is woken up and calls snd_card_free(). | |
325 | * | |
326 | * When a card can be disconnected at any time by hotplug service, | |
327 | * this function should be used in disconnect (or detach) callback | |
328 | * instead of calling snd_card_free() directly. | |
329 | * | |
330 | * Returns - zero otherwise a negative error code if the start of thread failed. | |
331 | */ | |
332 | int snd_card_free_in_thread(snd_card_t * card) | |
333 | { | |
334 | if (card->files == NULL) { | |
335 | snd_card_free(card); | |
336 | return 0; | |
337 | } | |
338 | ||
339 | if (schedule_work(&card->free_workq)) | |
340 | return 0; | |
341 | ||
342 | snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); | |
343 | /* try to free the structure immediately */ | |
344 | snd_card_free(card); | |
345 | return -EFAULT; | |
346 | } | |
347 | ||
348 | static void choose_default_id(snd_card_t * card) | |
349 | { | |
350 | int i, len, idx_flag = 0, loops = 8; | |
351 | char *id, *spos; | |
352 | ||
353 | id = spos = card->shortname; | |
354 | while (*id != '\0') { | |
355 | if (*id == ' ') | |
356 | spos = id + 1; | |
357 | id++; | |
358 | } | |
359 | id = card->id; | |
360 | while (*spos != '\0' && !isalnum(*spos)) | |
361 | spos++; | |
362 | if (isdigit(*spos)) | |
363 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
364 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
365 | if (isalnum(*spos)) | |
366 | *id++ = *spos; | |
367 | spos++; | |
368 | } | |
369 | *id = '\0'; | |
370 | ||
371 | id = card->id; | |
372 | ||
373 | if (*id == '\0') | |
374 | strcpy(id, "default"); | |
375 | ||
376 | while (1) { | |
377 | if (loops-- == 0) { | |
378 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
379 | strcpy(card->id, card->proc_root->name); | |
380 | return; | |
381 | } | |
382 | if (!snd_info_check_reserved_words(id)) | |
383 | goto __change; | |
384 | for (i = 0; i < snd_ecards_limit; i++) { | |
385 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
386 | goto __change; | |
387 | } | |
388 | break; | |
389 | ||
390 | __change: | |
391 | len = strlen(id); | |
392 | if (idx_flag) | |
393 | id[len-1]++; | |
394 | else if ((size_t)len <= sizeof(card->id) - 3) { | |
395 | strcat(id, "_1"); | |
396 | idx_flag++; | |
397 | } else { | |
398 | spos = id + len - 2; | |
399 | if ((size_t)len <= sizeof(card->id) - 2) | |
400 | spos++; | |
401 | *spos++ = '_'; | |
402 | *spos++ = '1'; | |
403 | *spos++ = '\0'; | |
404 | idx_flag++; | |
405 | } | |
406 | } | |
407 | } | |
408 | ||
409 | /** | |
410 | * snd_card_register - register the soundcard | |
411 | * @card: soundcard structure | |
412 | * | |
413 | * This function registers all the devices assigned to the soundcard. | |
414 | * Until calling this, the ALSA control interface is blocked from the | |
415 | * external accesses. Thus, you should call this function at the end | |
416 | * of the initialization of the card. | |
417 | * | |
418 | * Returns zero otherwise a negative error code if the registrain failed. | |
419 | */ | |
420 | int snd_card_register(snd_card_t * card) | |
421 | { | |
422 | int err; | |
423 | snd_info_entry_t *entry; | |
424 | ||
425 | snd_runtime_check(card != NULL, return -EINVAL); | |
426 | if ((err = snd_device_register_all(card)) < 0) | |
427 | return err; | |
428 | write_lock(&snd_card_rwlock); | |
429 | if (snd_cards[card->number]) { | |
430 | /* already registered */ | |
431 | write_unlock(&snd_card_rwlock); | |
432 | return 0; | |
433 | } | |
434 | if (card->id[0] == '\0') | |
435 | choose_default_id(card); | |
436 | snd_cards[card->number] = card; | |
437 | write_unlock(&snd_card_rwlock); | |
438 | if ((err = snd_info_card_register(card)) < 0) { | |
439 | snd_printd("unable to create card info\n"); | |
440 | goto __skip_info; | |
441 | } | |
442 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
443 | snd_printd("unable to create card entry\n"); | |
444 | goto __skip_info; | |
445 | } | |
446 | entry->c.text.read_size = PAGE_SIZE; | |
447 | entry->c.text.read = snd_card_id_read; | |
448 | if (snd_info_register(entry) < 0) { | |
449 | snd_info_free_entry(entry); | |
450 | entry = NULL; | |
451 | } | |
452 | card->proc_id = entry; | |
453 | __skip_info: | |
454 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
455 | if (snd_mixer_oss_notify_callback) | |
456 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
457 | #endif | |
458 | return 0; | |
459 | } | |
460 | ||
461 | static snd_info_entry_t *snd_card_info_entry = NULL; | |
462 | ||
463 | static void snd_card_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) | |
464 | { | |
465 | int idx, count; | |
466 | snd_card_t *card; | |
467 | ||
468 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
469 | read_lock(&snd_card_rwlock); | |
470 | if ((card = snd_cards[idx]) != NULL) { | |
471 | count++; | |
472 | snd_iprintf(buffer, "%i [%-15s]: %s - %s\n", | |
473 | idx, | |
474 | card->id, | |
475 | card->driver, | |
476 | card->shortname); | |
477 | snd_iprintf(buffer, " %s\n", | |
478 | card->longname); | |
479 | } | |
480 | read_unlock(&snd_card_rwlock); | |
481 | } | |
482 | if (!count) | |
483 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
484 | } | |
485 | ||
486 | #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS) | |
487 | ||
488 | void snd_card_info_read_oss(snd_info_buffer_t * buffer) | |
489 | { | |
490 | int idx, count; | |
491 | snd_card_t *card; | |
492 | ||
493 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
494 | read_lock(&snd_card_rwlock); | |
495 | if ((card = snd_cards[idx]) != NULL) { | |
496 | count++; | |
497 | snd_iprintf(buffer, "%s\n", card->longname); | |
498 | } | |
499 | read_unlock(&snd_card_rwlock); | |
500 | } | |
501 | if (!count) { | |
502 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
503 | } | |
504 | } | |
505 | ||
506 | #endif | |
507 | ||
508 | #ifdef MODULE | |
509 | static snd_info_entry_t *snd_card_module_info_entry; | |
510 | static void snd_card_module_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) | |
511 | { | |
512 | int idx; | |
513 | snd_card_t *card; | |
514 | ||
515 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
516 | read_lock(&snd_card_rwlock); | |
517 | if ((card = snd_cards[idx]) != NULL) | |
518 | snd_iprintf(buffer, "%i %s\n", idx, card->module->name); | |
519 | read_unlock(&snd_card_rwlock); | |
520 | } | |
521 | } | |
522 | #endif | |
523 | ||
524 | int __init snd_card_info_init(void) | |
525 | { | |
526 | snd_info_entry_t *entry; | |
527 | ||
528 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
529 | snd_runtime_check(entry != NULL, return -ENOMEM); | |
530 | entry->c.text.read_size = PAGE_SIZE; | |
531 | entry->c.text.read = snd_card_info_read; | |
532 | if (snd_info_register(entry) < 0) { | |
533 | snd_info_free_entry(entry); | |
534 | return -ENOMEM; | |
535 | } | |
536 | snd_card_info_entry = entry; | |
537 | ||
538 | #ifdef MODULE | |
539 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
540 | if (entry) { | |
541 | entry->c.text.read_size = PAGE_SIZE; | |
542 | entry->c.text.read = snd_card_module_info_read; | |
543 | if (snd_info_register(entry) < 0) | |
544 | snd_info_free_entry(entry); | |
545 | else | |
546 | snd_card_module_info_entry = entry; | |
547 | } | |
548 | #endif | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | int __exit snd_card_info_done(void) | |
554 | { | |
555 | if (snd_card_info_entry) | |
556 | snd_info_unregister(snd_card_info_entry); | |
557 | #ifdef MODULE | |
558 | if (snd_card_module_info_entry) | |
559 | snd_info_unregister(snd_card_module_info_entry); | |
560 | #endif | |
561 | return 0; | |
562 | } | |
563 | ||
564 | /** | |
565 | * snd_component_add - add a component string | |
566 | * @card: soundcard structure | |
567 | * @component: the component id string | |
568 | * | |
569 | * This function adds the component id string to the supported list. | |
570 | * The component can be referred from the alsa-lib. | |
571 | * | |
572 | * Returns zero otherwise a negative error code. | |
573 | */ | |
574 | ||
575 | int snd_component_add(snd_card_t *card, const char *component) | |
576 | { | |
577 | char *ptr; | |
578 | int len = strlen(component); | |
579 | ||
580 | ptr = strstr(card->components, component); | |
581 | if (ptr != NULL) { | |
582 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
583 | return 1; | |
584 | } | |
585 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
586 | snd_BUG(); | |
587 | return -ENOMEM; | |
588 | } | |
589 | if (card->components[0] != '\0') | |
590 | strcat(card->components, " "); | |
591 | strcat(card->components, component); | |
592 | return 0; | |
593 | } | |
594 | ||
595 | /** | |
596 | * snd_card_file_add - add the file to the file list of the card | |
597 | * @card: soundcard structure | |
598 | * @file: file pointer | |
599 | * | |
600 | * This function adds the file to the file linked-list of the card. | |
601 | * This linked-list is used to keep tracking the connection state, | |
602 | * and to avoid the release of busy resources by hotplug. | |
603 | * | |
604 | * Returns zero or a negative error code. | |
605 | */ | |
606 | int snd_card_file_add(snd_card_t *card, struct file *file) | |
607 | { | |
608 | struct snd_monitor_file *mfile; | |
609 | ||
610 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
611 | if (mfile == NULL) | |
612 | return -ENOMEM; | |
613 | mfile->file = file; | |
614 | mfile->next = NULL; | |
615 | spin_lock(&card->files_lock); | |
616 | if (card->shutdown) { | |
617 | spin_unlock(&card->files_lock); | |
618 | kfree(mfile); | |
619 | return -ENODEV; | |
620 | } | |
621 | mfile->next = card->files; | |
622 | card->files = mfile; | |
623 | spin_unlock(&card->files_lock); | |
624 | return 0; | |
625 | } | |
626 | ||
627 | /** | |
628 | * snd_card_file_remove - remove the file from the file list | |
629 | * @card: soundcard structure | |
630 | * @file: file pointer | |
631 | * | |
632 | * This function removes the file formerly added to the card via | |
633 | * snd_card_file_add() function. | |
634 | * If all files are removed and the release of the card is | |
635 | * scheduled, it will wake up the the thread to call snd_card_free() | |
636 | * (see snd_card_free_in_thread() function). | |
637 | * | |
638 | * Returns zero or a negative error code. | |
639 | */ | |
640 | int snd_card_file_remove(snd_card_t *card, struct file *file) | |
641 | { | |
642 | struct snd_monitor_file *mfile, *pfile = NULL; | |
643 | ||
644 | spin_lock(&card->files_lock); | |
645 | mfile = card->files; | |
646 | while (mfile) { | |
647 | if (mfile->file == file) { | |
648 | if (pfile) | |
649 | pfile->next = mfile->next; | |
650 | else | |
651 | card->files = mfile->next; | |
652 | break; | |
653 | } | |
654 | pfile = mfile; | |
655 | mfile = mfile->next; | |
656 | } | |
657 | spin_unlock(&card->files_lock); | |
658 | if (card->files == NULL) | |
659 | wake_up(&card->shutdown_sleep); | |
660 | if (!mfile) { | |
661 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
662 | return -ENOENT; | |
663 | } | |
664 | kfree(mfile); | |
665 | return 0; | |
666 | } | |
667 | ||
668 | #ifdef CONFIG_PM | |
669 | /** | |
670 | * snd_power_wait - wait until the power-state is changed. | |
671 | * @card: soundcard structure | |
672 | * @power_state: expected power state | |
673 | * @file: file structure for the O_NONBLOCK check (optional) | |
674 | * | |
675 | * Waits until the power-state is changed. | |
676 | * | |
677 | * Note: the power lock must be active before call. | |
678 | */ | |
679 | int snd_power_wait(snd_card_t *card, unsigned int power_state, struct file *file) | |
680 | { | |
681 | wait_queue_t wait; | |
682 | int result = 0; | |
683 | ||
684 | /* fastpath */ | |
685 | if (snd_power_get_state(card) == power_state) | |
686 | return 0; | |
687 | init_waitqueue_entry(&wait, current); | |
688 | add_wait_queue(&card->power_sleep, &wait); | |
689 | while (1) { | |
690 | if (card->shutdown) { | |
691 | result = -ENODEV; | |
692 | break; | |
693 | } | |
694 | if (snd_power_get_state(card) == power_state) | |
695 | break; | |
696 | #if 0 /* block all devices */ | |
697 | if (file && (file->f_flags & O_NONBLOCK)) { | |
698 | result = -EAGAIN; | |
699 | break; | |
700 | } | |
701 | #endif | |
702 | set_current_state(TASK_UNINTERRUPTIBLE); | |
703 | snd_power_unlock(card); | |
704 | schedule_timeout(30 * HZ); | |
705 | snd_power_lock(card); | |
706 | } | |
707 | remove_wait_queue(&card->power_sleep, &wait); | |
708 | return result; | |
709 | } | |
710 | ||
711 | /** | |
712 | * snd_card_set_pm_callback - set the PCI power-management callbacks | |
713 | * @card: soundcard structure | |
714 | * @suspend: suspend callback function | |
715 | * @resume: resume callback function | |
716 | * @private_data: private data to pass to the callback functions | |
717 | * | |
718 | * Sets the power-management callback functions of the card. | |
719 | * These callbacks are called from ALSA's common PCI suspend/resume | |
720 | * handler and from the control API. | |
721 | */ | |
722 | int snd_card_set_pm_callback(snd_card_t *card, | |
723 | int (*suspend)(snd_card_t *, pm_message_t), | |
724 | int (*resume)(snd_card_t *), | |
725 | void *private_data) | |
726 | { | |
727 | card->pm_suspend = suspend; | |
728 | card->pm_resume = resume; | |
729 | card->pm_private_data = private_data; | |
730 | return 0; | |
731 | } | |
732 | ||
733 | #ifdef CONFIG_SND_GENERIC_PM | |
734 | /* | |
735 | * use platform_device for generic power-management without a proper bus | |
736 | * (e.g. ISA) | |
737 | */ | |
738 | struct snd_generic_device { | |
739 | struct platform_device pdev; | |
740 | snd_card_t *card; | |
741 | }; | |
742 | ||
743 | #define get_snd_generic_card(dev) container_of(to_platform_device(dev), struct snd_generic_device, pdev)->card | |
744 | ||
745 | #define SND_GENERIC_NAME "snd_generic_pm" | |
746 | ||
747 | static int snd_generic_suspend(struct device *dev, u32 state, u32 level); | |
748 | static int snd_generic_resume(struct device *dev, u32 level); | |
749 | ||
750 | static struct device_driver snd_generic_driver = { | |
751 | .name = SND_GENERIC_NAME, | |
752 | .bus = &platform_bus_type, | |
753 | .suspend = snd_generic_suspend, | |
754 | .resume = snd_generic_resume, | |
755 | }; | |
756 | ||
757 | static int generic_driver_registered; | |
758 | ||
759 | static void generic_driver_unregister(void) | |
760 | { | |
761 | if (generic_driver_registered) { | |
762 | generic_driver_registered--; | |
763 | if (! generic_driver_registered) | |
764 | driver_unregister(&snd_generic_driver); | |
765 | } | |
766 | } | |
767 | ||
768 | static struct snd_generic_device *snd_generic_device_register(snd_card_t *card) | |
769 | { | |
770 | struct snd_generic_device *dev; | |
771 | ||
772 | if (! generic_driver_registered) { | |
773 | if (driver_register(&snd_generic_driver) < 0) | |
774 | return NULL; | |
775 | } | |
776 | generic_driver_registered++; | |
777 | ||
778 | dev = kcalloc(1, sizeof(*dev), GFP_KERNEL); | |
779 | if (! dev) { | |
780 | generic_driver_unregister(); | |
781 | return NULL; | |
782 | } | |
783 | ||
784 | dev->pdev.name = SND_GENERIC_NAME; | |
785 | dev->pdev.id = card->number; | |
786 | dev->card = card; | |
787 | if (platform_device_register(&dev->pdev) < 0) { | |
788 | kfree(dev); | |
789 | generic_driver_unregister(); | |
790 | return NULL; | |
791 | } | |
792 | return dev; | |
793 | } | |
794 | ||
795 | static void snd_generic_device_unregister(struct snd_generic_device *dev) | |
796 | { | |
797 | platform_device_unregister(&dev->pdev); | |
798 | kfree(dev); | |
799 | generic_driver_unregister(); | |
800 | } | |
801 | ||
802 | /* suspend/resume callbacks for snd_generic platform device */ | |
803 | static int snd_generic_suspend(struct device *dev, u32 state, u32 level) | |
804 | { | |
805 | snd_card_t *card; | |
806 | ||
807 | if (level != SUSPEND_DISABLE) | |
808 | return 0; | |
809 | ||
810 | card = get_snd_generic_card(dev); | |
811 | if (card->power_state == SNDRV_CTL_POWER_D3hot) | |
812 | return 0; | |
813 | card->pm_suspend(card, PMSG_SUSPEND); | |
814 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
815 | return 0; | |
816 | } | |
817 | ||
818 | static int snd_generic_resume(struct device *dev, u32 level) | |
819 | { | |
820 | snd_card_t *card; | |
821 | ||
822 | if (level != RESUME_ENABLE) | |
823 | return 0; | |
824 | ||
825 | card = get_snd_generic_card(dev); | |
826 | if (card->power_state == SNDRV_CTL_POWER_D0) | |
827 | return 0; | |
828 | card->pm_resume(card); | |
829 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
830 | return 0; | |
831 | } | |
832 | ||
833 | /** | |
834 | * snd_card_set_generic_pm_callback - set the generic power-management callbacks | |
835 | * @card: soundcard structure | |
836 | * @suspend: suspend callback function | |
837 | * @resume: resume callback function | |
838 | * @private_data: private data to pass to the callback functions | |
839 | * | |
840 | * Registers the power-management and sets the lowlevel callbacks for | |
841 | * the given card. These callbacks are called from the ALSA's common | |
842 | * PM handler and from the control API. | |
843 | */ | |
844 | int snd_card_set_generic_pm_callback(snd_card_t *card, | |
845 | int (*suspend)(snd_card_t *, pm_message_t), | |
846 | int (*resume)(snd_card_t *), | |
847 | void *private_data) | |
848 | { | |
849 | card->pm_dev = snd_generic_device_register(card); | |
850 | if (! card->pm_dev) | |
851 | return -ENOMEM; | |
852 | snd_card_set_pm_callback(card, suspend, resume, private_data); | |
853 | return 0; | |
854 | } | |
855 | #endif /* CONFIG_SND_GENERIC_PM */ | |
856 | ||
857 | #ifdef CONFIG_PCI | |
858 | int snd_card_pci_suspend(struct pci_dev *dev, pm_message_t state) | |
859 | { | |
860 | snd_card_t *card = pci_get_drvdata(dev); | |
861 | int err; | |
862 | if (! card || ! card->pm_suspend) | |
863 | return 0; | |
864 | if (card->power_state == SNDRV_CTL_POWER_D3hot) | |
865 | return 0; | |
866 | err = card->pm_suspend(card, PMSG_SUSPEND); | |
867 | pci_save_state(dev); | |
868 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
869 | return err; | |
870 | } | |
871 | ||
872 | int snd_card_pci_resume(struct pci_dev *dev) | |
873 | { | |
874 | snd_card_t *card = pci_get_drvdata(dev); | |
875 | if (! card || ! card->pm_resume) | |
876 | return 0; | |
877 | if (card->power_state == SNDRV_CTL_POWER_D0) | |
878 | return 0; | |
879 | /* restore the PCI config space */ | |
880 | pci_restore_state(dev); | |
881 | card->pm_resume(card); | |
882 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
883 | return 0; | |
884 | } | |
885 | #endif | |
886 | ||
887 | #endif /* CONFIG_PM */ |