Commit | Line | Data |
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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> | |
d052d1be RK |
31 | #include <linux/platform_device.h> |
32 | ||
1da177e4 LT |
33 | #include <sound/core.h> |
34 | #include <sound/control.h> | |
35 | #include <sound/info.h> | |
36 | ||
37 | struct snd_shutdown_f_ops { | |
38 | struct file_operations f_ops; | |
39 | struct snd_shutdown_f_ops *next; | |
40 | }; | |
41 | ||
42 | unsigned int snd_cards_lock = 0; /* locked for registering/using */ | |
512bbd6a | 43 | struct snd_card *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL}; |
1da177e4 LT |
44 | DEFINE_RWLOCK(snd_card_rwlock); |
45 | ||
46 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
512bbd6a | 47 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
1da177e4 LT |
48 | #endif |
49 | ||
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 | ||
56 | static void snd_card_free_thread(void * __card); | |
57 | ||
58 | /** | |
59 | * snd_card_new - create and initialize a soundcard structure | |
60 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
61 | * @xid: card identification (ASCII string) | |
62 | * @module: top level module for locking | |
63 | * @extra_size: allocate this extra size after the main soundcard structure | |
64 | * | |
65 | * Creates and initializes a soundcard structure. | |
66 | * | |
512bbd6a | 67 | * Returns kmallocated snd_card structure. Creates the ALSA control interface |
1da177e4 LT |
68 | * (which is blocked until snd_card_register function is called). |
69 | */ | |
512bbd6a | 70 | struct snd_card *snd_card_new(int idx, const char *xid, |
1da177e4 LT |
71 | struct module *module, int extra_size) |
72 | { | |
512bbd6a | 73 | struct snd_card *card; |
1da177e4 LT |
74 | int err; |
75 | ||
76 | if (extra_size < 0) | |
77 | extra_size = 0; | |
ca2c0966 | 78 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
1da177e4 LT |
79 | if (card == NULL) |
80 | return NULL; | |
81 | if (xid) { | |
82 | if (!snd_info_check_reserved_words(xid)) | |
83 | goto __error; | |
84 | strlcpy(card->id, xid, sizeof(card->id)); | |
85 | } | |
86 | err = 0; | |
87 | write_lock(&snd_card_rwlock); | |
88 | if (idx < 0) { | |
89 | int idx2; | |
90 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
91 | if (~snd_cards_lock & idx & 1<<idx2) { | |
92 | idx = idx2; | |
93 | if (idx >= snd_ecards_limit) | |
94 | snd_ecards_limit = idx + 1; | |
95 | break; | |
96 | } | |
97 | } else if (idx < snd_ecards_limit) { | |
98 | if (snd_cards_lock & (1 << idx)) | |
99 | err = -ENODEV; /* invalid */ | |
100 | } else if (idx < SNDRV_CARDS) | |
101 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
102 | else | |
103 | err = -ENODEV; | |
104 | if (idx < 0 || err < 0) { | |
105 | write_unlock(&snd_card_rwlock); | |
106 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); | |
107 | goto __error; | |
108 | } | |
109 | snd_cards_lock |= 1 << idx; /* lock it */ | |
110 | write_unlock(&snd_card_rwlock); | |
111 | card->number = idx; | |
112 | card->module = module; | |
113 | INIT_LIST_HEAD(&card->devices); | |
114 | init_rwsem(&card->controls_rwsem); | |
115 | rwlock_init(&card->ctl_files_rwlock); | |
116 | INIT_LIST_HEAD(&card->controls); | |
117 | INIT_LIST_HEAD(&card->ctl_files); | |
118 | spin_lock_init(&card->files_lock); | |
119 | init_waitqueue_head(&card->shutdown_sleep); | |
120 | INIT_WORK(&card->free_workq, snd_card_free_thread, card); | |
121 | #ifdef CONFIG_PM | |
122 | init_MUTEX(&card->power_lock); | |
123 | init_waitqueue_head(&card->power_sleep); | |
124 | #endif | |
125 | /* the control interface cannot be accessed from the user space until */ | |
126 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
127 | if ((err = snd_ctl_create(card)) < 0) { | |
128 | snd_printd("unable to register control minors\n"); | |
129 | goto __error; | |
130 | } | |
131 | if ((err = snd_info_card_create(card)) < 0) { | |
132 | snd_printd("unable to create card info\n"); | |
133 | goto __error_ctl; | |
134 | } | |
135 | if (extra_size > 0) | |
512bbd6a | 136 | card->private_data = (char *)card + sizeof(struct snd_card); |
1da177e4 LT |
137 | return card; |
138 | ||
139 | __error_ctl: | |
140 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
141 | __error: | |
142 | kfree(card); | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) | |
147 | { | |
148 | return POLLERR | POLLNVAL; | |
149 | } | |
150 | ||
151 | /** | |
152 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
153 | * @card: soundcard structure | |
154 | * | |
155 | * Disconnects all APIs from the file-operations (user space). | |
156 | * | |
157 | * Returns zero, otherwise a negative error code. | |
158 | * | |
159 | * Note: The current implementation replaces all active file->f_op with special | |
160 | * dummy file operations (they do nothing except release). | |
161 | */ | |
512bbd6a | 162 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
163 | { |
164 | struct snd_monitor_file *mfile; | |
165 | struct file *file; | |
166 | struct snd_shutdown_f_ops *s_f_ops; | |
167 | struct file_operations *f_ops, *old_f_ops; | |
168 | int err; | |
169 | ||
170 | spin_lock(&card->files_lock); | |
171 | if (card->shutdown) { | |
172 | spin_unlock(&card->files_lock); | |
173 | return 0; | |
174 | } | |
175 | card->shutdown = 1; | |
176 | spin_unlock(&card->files_lock); | |
177 | ||
178 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
179 | write_lock(&snd_card_rwlock); | |
180 | snd_cards[card->number] = NULL; | |
181 | write_unlock(&snd_card_rwlock); | |
182 | ||
183 | /* phase 2: replace file->f_op with special dummy operations */ | |
184 | ||
185 | spin_lock(&card->files_lock); | |
186 | mfile = card->files; | |
187 | while (mfile) { | |
188 | file = mfile->file; | |
189 | ||
190 | /* it's critical part, use endless loop */ | |
191 | /* we have no room to fail */ | |
192 | s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); | |
193 | if (s_f_ops == NULL) | |
194 | panic("Atomic allocation failed for snd_shutdown_f_ops!"); | |
195 | ||
196 | f_ops = &s_f_ops->f_ops; | |
197 | ||
198 | memset(f_ops, 0, sizeof(*f_ops)); | |
199 | f_ops->owner = file->f_op->owner; | |
200 | f_ops->release = file->f_op->release; | |
201 | f_ops->poll = snd_disconnect_poll; | |
202 | ||
203 | s_f_ops->next = card->s_f_ops; | |
204 | card->s_f_ops = s_f_ops; | |
205 | ||
206 | f_ops = fops_get(f_ops); | |
207 | ||
208 | old_f_ops = file->f_op; | |
209 | file->f_op = f_ops; /* must be atomic */ | |
210 | fops_put(old_f_ops); | |
211 | ||
212 | mfile = mfile->next; | |
213 | } | |
214 | spin_unlock(&card->files_lock); | |
215 | ||
216 | /* phase 3: notify all connected devices about disconnection */ | |
217 | /* at this point, they cannot respond to any calls except release() */ | |
218 | ||
219 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
220 | if (snd_mixer_oss_notify_callback) | |
221 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
222 | #endif | |
223 | ||
224 | /* notify all devices that we are disconnected */ | |
225 | err = snd_device_disconnect_all(card); | |
226 | if (err < 0) | |
227 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
ecbcfe36 | 232 | #ifdef CONFIG_SND_GENERIC_DRIVER |
512bbd6a | 233 | static void snd_generic_device_unregister(struct snd_card *card); |
ecbcfe36 TI |
234 | #else |
235 | #define snd_generic_device_unregister(x) /*NOP*/ | |
1da177e4 LT |
236 | #endif |
237 | ||
238 | /** | |
239 | * snd_card_free - frees given soundcard structure | |
240 | * @card: soundcard structure | |
241 | * | |
242 | * This function releases the soundcard structure and the all assigned | |
243 | * devices automatically. That is, you don't have to release the devices | |
244 | * by yourself. | |
245 | * | |
246 | * Returns zero. Frees all associated devices and frees the control | |
247 | * interface associated to given soundcard. | |
248 | */ | |
512bbd6a | 249 | int snd_card_free(struct snd_card *card) |
1da177e4 LT |
250 | { |
251 | struct snd_shutdown_f_ops *s_f_ops; | |
252 | ||
253 | if (card == NULL) | |
254 | return -EINVAL; | |
255 | write_lock(&snd_card_rwlock); | |
256 | snd_cards[card->number] = NULL; | |
257 | write_unlock(&snd_card_rwlock); | |
258 | ||
259 | #ifdef CONFIG_PM | |
260 | wake_up(&card->power_sleep); | |
1da177e4 | 261 | #endif |
1da177e4 LT |
262 | /* wait, until all devices are ready for the free operation */ |
263 | wait_event(card->shutdown_sleep, card->files == NULL); | |
264 | ||
265 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
266 | if (snd_mixer_oss_notify_callback) | |
267 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
268 | #endif | |
269 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
270 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
271 | /* Fatal, but this situation should never occur */ | |
272 | } | |
273 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
274 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
275 | /* Fatal, but this situation should never occur */ | |
276 | } | |
277 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
278 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
279 | /* Fatal, but this situation should never occur */ | |
280 | } | |
281 | if (card->private_free) | |
282 | card->private_free(card); | |
283 | if (card->proc_id) | |
284 | snd_info_unregister(card->proc_id); | |
285 | if (snd_info_card_free(card) < 0) { | |
286 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
287 | /* Not fatal error */ | |
288 | } | |
ecbcfe36 | 289 | snd_generic_device_unregister(card); |
1da177e4 LT |
290 | while (card->s_f_ops) { |
291 | s_f_ops = card->s_f_ops; | |
292 | card->s_f_ops = s_f_ops->next; | |
293 | kfree(s_f_ops); | |
294 | } | |
295 | write_lock(&snd_card_rwlock); | |
296 | snd_cards_lock &= ~(1 << card->number); | |
297 | write_unlock(&snd_card_rwlock); | |
298 | kfree(card); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static void snd_card_free_thread(void * __card) | |
303 | { | |
512bbd6a | 304 | struct snd_card *card = __card; |
1da177e4 LT |
305 | struct module * module = card->module; |
306 | ||
307 | if (!try_module_get(module)) { | |
308 | snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); | |
309 | module = NULL; | |
310 | } | |
311 | ||
312 | snd_card_free(card); | |
313 | ||
314 | module_put(module); | |
315 | } | |
316 | ||
317 | /** | |
318 | * snd_card_free_in_thread - call snd_card_free() in thread | |
319 | * @card: soundcard structure | |
320 | * | |
321 | * This function schedules the call of snd_card_free() function in a | |
322 | * work queue. When all devices are released (non-busy), the work | |
323 | * is woken up and calls snd_card_free(). | |
324 | * | |
325 | * When a card can be disconnected at any time by hotplug service, | |
326 | * this function should be used in disconnect (or detach) callback | |
327 | * instead of calling snd_card_free() directly. | |
328 | * | |
329 | * Returns - zero otherwise a negative error code if the start of thread failed. | |
330 | */ | |
512bbd6a | 331 | int snd_card_free_in_thread(struct snd_card *card) |
1da177e4 LT |
332 | { |
333 | if (card->files == NULL) { | |
334 | snd_card_free(card); | |
335 | return 0; | |
336 | } | |
337 | ||
338 | if (schedule_work(&card->free_workq)) | |
339 | return 0; | |
340 | ||
341 | snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); | |
342 | /* try to free the structure immediately */ | |
343 | snd_card_free(card); | |
344 | return -EFAULT; | |
345 | } | |
346 | ||
512bbd6a | 347 | static void choose_default_id(struct snd_card *card) |
1da177e4 LT |
348 | { |
349 | int i, len, idx_flag = 0, loops = 8; | |
350 | char *id, *spos; | |
351 | ||
352 | id = spos = card->shortname; | |
353 | while (*id != '\0') { | |
354 | if (*id == ' ') | |
355 | spos = id + 1; | |
356 | id++; | |
357 | } | |
358 | id = card->id; | |
359 | while (*spos != '\0' && !isalnum(*spos)) | |
360 | spos++; | |
361 | if (isdigit(*spos)) | |
362 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
363 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
364 | if (isalnum(*spos)) | |
365 | *id++ = *spos; | |
366 | spos++; | |
367 | } | |
368 | *id = '\0'; | |
369 | ||
370 | id = card->id; | |
371 | ||
372 | if (*id == '\0') | |
373 | strcpy(id, "default"); | |
374 | ||
375 | while (1) { | |
376 | if (loops-- == 0) { | |
377 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
378 | strcpy(card->id, card->proc_root->name); | |
379 | return; | |
380 | } | |
381 | if (!snd_info_check_reserved_words(id)) | |
382 | goto __change; | |
383 | for (i = 0; i < snd_ecards_limit; i++) { | |
384 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
385 | goto __change; | |
386 | } | |
387 | break; | |
388 | ||
389 | __change: | |
390 | len = strlen(id); | |
391 | if (idx_flag) | |
392 | id[len-1]++; | |
393 | else if ((size_t)len <= sizeof(card->id) - 3) { | |
394 | strcat(id, "_1"); | |
395 | idx_flag++; | |
396 | } else { | |
397 | spos = id + len - 2; | |
398 | if ((size_t)len <= sizeof(card->id) - 2) | |
399 | spos++; | |
400 | *spos++ = '_'; | |
401 | *spos++ = '1'; | |
402 | *spos++ = '\0'; | |
403 | idx_flag++; | |
404 | } | |
405 | } | |
406 | } | |
407 | ||
408 | /** | |
409 | * snd_card_register - register the soundcard | |
410 | * @card: soundcard structure | |
411 | * | |
412 | * This function registers all the devices assigned to the soundcard. | |
413 | * Until calling this, the ALSA control interface is blocked from the | |
414 | * external accesses. Thus, you should call this function at the end | |
415 | * of the initialization of the card. | |
416 | * | |
417 | * Returns zero otherwise a negative error code if the registrain failed. | |
418 | */ | |
512bbd6a | 419 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
420 | { |
421 | int err; | |
512bbd6a | 422 | struct snd_info_entry *entry; |
1da177e4 | 423 | |
7c22f1aa | 424 | snd_assert(card != NULL, return -EINVAL); |
1da177e4 LT |
425 | if ((err = snd_device_register_all(card)) < 0) |
426 | return err; | |
427 | write_lock(&snd_card_rwlock); | |
428 | if (snd_cards[card->number]) { | |
429 | /* already registered */ | |
430 | write_unlock(&snd_card_rwlock); | |
431 | return 0; | |
432 | } | |
433 | if (card->id[0] == '\0') | |
434 | choose_default_id(card); | |
435 | snd_cards[card->number] = card; | |
436 | write_unlock(&snd_card_rwlock); | |
437 | if ((err = snd_info_card_register(card)) < 0) { | |
438 | snd_printd("unable to create card info\n"); | |
439 | goto __skip_info; | |
440 | } | |
441 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
442 | snd_printd("unable to create card entry\n"); | |
443 | goto __skip_info; | |
444 | } | |
445 | entry->c.text.read_size = PAGE_SIZE; | |
446 | entry->c.text.read = snd_card_id_read; | |
447 | if (snd_info_register(entry) < 0) { | |
448 | snd_info_free_entry(entry); | |
449 | entry = NULL; | |
450 | } | |
451 | card->proc_id = entry; | |
452 | __skip_info: | |
453 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
454 | if (snd_mixer_oss_notify_callback) | |
455 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
456 | #endif | |
457 | return 0; | |
458 | } | |
459 | ||
512bbd6a | 460 | static struct snd_info_entry *snd_card_info_entry = NULL; |
1da177e4 | 461 | |
512bbd6a | 462 | static void snd_card_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
1da177e4 LT |
463 | { |
464 | int idx, count; | |
512bbd6a | 465 | struct snd_card *card; |
1da177e4 LT |
466 | |
467 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
468 | read_lock(&snd_card_rwlock); | |
469 | if ((card = snd_cards[idx]) != NULL) { | |
470 | count++; | |
471 | snd_iprintf(buffer, "%i [%-15s]: %s - %s\n", | |
472 | idx, | |
473 | card->id, | |
474 | card->driver, | |
475 | card->shortname); | |
476 | snd_iprintf(buffer, " %s\n", | |
477 | card->longname); | |
478 | } | |
479 | read_unlock(&snd_card_rwlock); | |
480 | } | |
481 | if (!count) | |
482 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
483 | } | |
484 | ||
485 | #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS) | |
486 | ||
512bbd6a | 487 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
488 | { |
489 | int idx, count; | |
512bbd6a | 490 | struct snd_card *card; |
1da177e4 LT |
491 | |
492 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
493 | read_lock(&snd_card_rwlock); | |
494 | if ((card = snd_cards[idx]) != NULL) { | |
495 | count++; | |
496 | snd_iprintf(buffer, "%s\n", card->longname); | |
497 | } | |
498 | read_unlock(&snd_card_rwlock); | |
499 | } | |
500 | if (!count) { | |
501 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
502 | } | |
503 | } | |
504 | ||
505 | #endif | |
506 | ||
507 | #ifdef MODULE | |
512bbd6a TI |
508 | static struct snd_info_entry *snd_card_module_info_entry; |
509 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
510 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
511 | { |
512 | int idx; | |
512bbd6a | 513 | struct snd_card *card; |
1da177e4 LT |
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 | { | |
512bbd6a | 526 | struct snd_info_entry *entry; |
1da177e4 LT |
527 | |
528 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
529 | if (! entry) |
530 | return -ENOMEM; | |
1da177e4 LT |
531 | entry->c.text.read_size = PAGE_SIZE; |
532 | entry->c.text.read = snd_card_info_read; | |
533 | if (snd_info_register(entry) < 0) { | |
534 | snd_info_free_entry(entry); | |
535 | return -ENOMEM; | |
536 | } | |
537 | snd_card_info_entry = entry; | |
538 | ||
539 | #ifdef MODULE | |
540 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
541 | if (entry) { | |
542 | entry->c.text.read_size = PAGE_SIZE; | |
543 | entry->c.text.read = snd_card_module_info_read; | |
544 | if (snd_info_register(entry) < 0) | |
545 | snd_info_free_entry(entry); | |
546 | else | |
547 | snd_card_module_info_entry = entry; | |
548 | } | |
549 | #endif | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | int __exit snd_card_info_done(void) | |
555 | { | |
556 | if (snd_card_info_entry) | |
557 | snd_info_unregister(snd_card_info_entry); | |
558 | #ifdef MODULE | |
559 | if (snd_card_module_info_entry) | |
560 | snd_info_unregister(snd_card_module_info_entry); | |
561 | #endif | |
562 | return 0; | |
563 | } | |
564 | ||
565 | /** | |
566 | * snd_component_add - add a component string | |
567 | * @card: soundcard structure | |
568 | * @component: the component id string | |
569 | * | |
570 | * This function adds the component id string to the supported list. | |
571 | * The component can be referred from the alsa-lib. | |
572 | * | |
573 | * Returns zero otherwise a negative error code. | |
574 | */ | |
575 | ||
512bbd6a | 576 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
577 | { |
578 | char *ptr; | |
579 | int len = strlen(component); | |
580 | ||
581 | ptr = strstr(card->components, component); | |
582 | if (ptr != NULL) { | |
583 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
584 | return 1; | |
585 | } | |
586 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
587 | snd_BUG(); | |
588 | return -ENOMEM; | |
589 | } | |
590 | if (card->components[0] != '\0') | |
591 | strcat(card->components, " "); | |
592 | strcat(card->components, component); | |
593 | return 0; | |
594 | } | |
595 | ||
596 | /** | |
597 | * snd_card_file_add - add the file to the file list of the card | |
598 | * @card: soundcard structure | |
599 | * @file: file pointer | |
600 | * | |
601 | * This function adds the file to the file linked-list of the card. | |
602 | * This linked-list is used to keep tracking the connection state, | |
603 | * and to avoid the release of busy resources by hotplug. | |
604 | * | |
605 | * Returns zero or a negative error code. | |
606 | */ | |
512bbd6a | 607 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
608 | { |
609 | struct snd_monitor_file *mfile; | |
610 | ||
611 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
612 | if (mfile == NULL) | |
613 | return -ENOMEM; | |
614 | mfile->file = file; | |
615 | mfile->next = NULL; | |
616 | spin_lock(&card->files_lock); | |
617 | if (card->shutdown) { | |
618 | spin_unlock(&card->files_lock); | |
619 | kfree(mfile); | |
620 | return -ENODEV; | |
621 | } | |
622 | mfile->next = card->files; | |
623 | card->files = mfile; | |
624 | spin_unlock(&card->files_lock); | |
625 | return 0; | |
626 | } | |
627 | ||
628 | /** | |
629 | * snd_card_file_remove - remove the file from the file list | |
630 | * @card: soundcard structure | |
631 | * @file: file pointer | |
632 | * | |
633 | * This function removes the file formerly added to the card via | |
634 | * snd_card_file_add() function. | |
635 | * If all files are removed and the release of the card is | |
636 | * scheduled, it will wake up the the thread to call snd_card_free() | |
637 | * (see snd_card_free_in_thread() function). | |
638 | * | |
639 | * Returns zero or a negative error code. | |
640 | */ | |
512bbd6a | 641 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
642 | { |
643 | struct snd_monitor_file *mfile, *pfile = NULL; | |
644 | ||
645 | spin_lock(&card->files_lock); | |
646 | mfile = card->files; | |
647 | while (mfile) { | |
648 | if (mfile->file == file) { | |
649 | if (pfile) | |
650 | pfile->next = mfile->next; | |
651 | else | |
652 | card->files = mfile->next; | |
653 | break; | |
654 | } | |
655 | pfile = mfile; | |
656 | mfile = mfile->next; | |
657 | } | |
658 | spin_unlock(&card->files_lock); | |
659 | if (card->files == NULL) | |
660 | wake_up(&card->shutdown_sleep); | |
661 | if (!mfile) { | |
662 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
663 | return -ENOENT; | |
664 | } | |
665 | kfree(mfile); | |
666 | return 0; | |
667 | } | |
668 | ||
ecbcfe36 TI |
669 | #ifdef CONFIG_SND_GENERIC_DRIVER |
670 | /* | |
671 | * generic device without a proper bus using platform_device | |
672 | * (e.g. ISA) | |
673 | */ | |
674 | struct snd_generic_device { | |
675 | struct platform_device pdev; | |
512bbd6a | 676 | struct snd_card *card; |
ecbcfe36 TI |
677 | }; |
678 | ||
3ae5eaec | 679 | #define get_snd_generic_card(dev) container_of(dev, struct snd_generic_device, pdev)->card |
ecbcfe36 TI |
680 | |
681 | #define SND_GENERIC_NAME "snd_generic" | |
682 | ||
683 | #ifdef CONFIG_PM | |
3ae5eaec RK |
684 | static int snd_generic_suspend(struct platform_device *dev, pm_message_t state); |
685 | static int snd_generic_resume(struct platform_device *dev); | |
ecbcfe36 TI |
686 | #endif |
687 | ||
688 | /* initialized in sound.c */ | |
3ae5eaec | 689 | struct platform_driver snd_generic_driver = { |
ecbcfe36 TI |
690 | #ifdef CONFIG_PM |
691 | .suspend = snd_generic_suspend, | |
692 | .resume = snd_generic_resume, | |
693 | #endif | |
3ae5eaec RK |
694 | .driver = { |
695 | .name = SND_GENERIC_NAME, | |
696 | }, | |
ecbcfe36 TI |
697 | }; |
698 | ||
699 | void snd_generic_device_release(struct device *dev) | |
700 | { | |
701 | } | |
702 | ||
512bbd6a | 703 | static int snd_generic_device_register(struct snd_card *card) |
ecbcfe36 TI |
704 | { |
705 | struct snd_generic_device *dev; | |
706 | int err; | |
707 | ||
708 | if (card->generic_dev) | |
709 | return 0; /* already registered */ | |
710 | ||
ca2c0966 | 711 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
ecbcfe36 TI |
712 | if (! dev) { |
713 | snd_printk(KERN_ERR "can't allocate generic_device\n"); | |
714 | return -ENOMEM; | |
715 | } | |
716 | ||
717 | dev->pdev.name = SND_GENERIC_NAME; | |
718 | dev->pdev.id = card->number; | |
719 | dev->pdev.dev.release = snd_generic_device_release; | |
720 | dev->card = card; | |
721 | if ((err = platform_device_register(&dev->pdev)) < 0) { | |
722 | kfree(dev); | |
723 | return err; | |
724 | } | |
725 | card->generic_dev = dev; | |
726 | return 0; | |
727 | } | |
728 | ||
512bbd6a | 729 | static void snd_generic_device_unregister(struct snd_card *card) |
ecbcfe36 TI |
730 | { |
731 | struct snd_generic_device *dev = card->generic_dev; | |
732 | if (dev) { | |
733 | platform_device_unregister(&dev->pdev); | |
734 | kfree(dev); | |
735 | card->generic_dev = NULL; | |
736 | } | |
737 | } | |
738 | ||
739 | /** | |
740 | * snd_card_set_generic_dev - assign the generic device to the card | |
741 | * @card: soundcard structure | |
742 | * | |
743 | * Assigns a generic device to the card. This function is provided as the | |
744 | * last resort, for devices without any proper bus. Thus this won't override | |
745 | * the device already assigned to the card. | |
746 | * | |
747 | * Returns zero if successful, or a negative error code. | |
748 | */ | |
512bbd6a | 749 | int snd_card_set_generic_dev(struct snd_card *card) |
ecbcfe36 TI |
750 | { |
751 | int err; | |
752 | if ((err = snd_generic_device_register(card)) < 0) | |
753 | return err; | |
754 | if (! card->dev) | |
755 | snd_card_set_dev(card, &card->generic_dev->pdev.dev); | |
756 | return 0; | |
757 | } | |
758 | #endif /* CONFIG_SND_GENERIC_DRIVER */ | |
759 | ||
1da177e4 LT |
760 | #ifdef CONFIG_PM |
761 | /** | |
762 | * snd_power_wait - wait until the power-state is changed. | |
763 | * @card: soundcard structure | |
764 | * @power_state: expected power state | |
765 | * @file: file structure for the O_NONBLOCK check (optional) | |
766 | * | |
767 | * Waits until the power-state is changed. | |
768 | * | |
769 | * Note: the power lock must be active before call. | |
770 | */ | |
512bbd6a | 771 | int snd_power_wait(struct snd_card *card, unsigned int power_state, struct file *file) |
1da177e4 LT |
772 | { |
773 | wait_queue_t wait; | |
774 | int result = 0; | |
775 | ||
776 | /* fastpath */ | |
777 | if (snd_power_get_state(card) == power_state) | |
778 | return 0; | |
779 | init_waitqueue_entry(&wait, current); | |
780 | add_wait_queue(&card->power_sleep, &wait); | |
781 | while (1) { | |
782 | if (card->shutdown) { | |
783 | result = -ENODEV; | |
784 | break; | |
785 | } | |
786 | if (snd_power_get_state(card) == power_state) | |
787 | break; | |
788 | #if 0 /* block all devices */ | |
789 | if (file && (file->f_flags & O_NONBLOCK)) { | |
790 | result = -EAGAIN; | |
791 | break; | |
792 | } | |
793 | #endif | |
794 | set_current_state(TASK_UNINTERRUPTIBLE); | |
795 | snd_power_unlock(card); | |
796 | schedule_timeout(30 * HZ); | |
797 | snd_power_lock(card); | |
798 | } | |
799 | remove_wait_queue(&card->power_sleep, &wait); | |
800 | return result; | |
801 | } | |
802 | ||
803 | /** | |
804 | * snd_card_set_pm_callback - set the PCI power-management callbacks | |
805 | * @card: soundcard structure | |
806 | * @suspend: suspend callback function | |
807 | * @resume: resume callback function | |
808 | * @private_data: private data to pass to the callback functions | |
809 | * | |
810 | * Sets the power-management callback functions of the card. | |
811 | * These callbacks are called from ALSA's common PCI suspend/resume | |
812 | * handler and from the control API. | |
813 | */ | |
512bbd6a TI |
814 | int snd_card_set_pm_callback(struct snd_card *card, |
815 | int (*suspend)(struct snd_card *, pm_message_t), | |
816 | int (*resume)(struct snd_card *), | |
1da177e4 LT |
817 | void *private_data) |
818 | { | |
819 | card->pm_suspend = suspend; | |
820 | card->pm_resume = resume; | |
821 | card->pm_private_data = private_data; | |
822 | return 0; | |
823 | } | |
824 | ||
ecbcfe36 | 825 | #ifdef CONFIG_SND_GENERIC_DRIVER |
1da177e4 | 826 | /* suspend/resume callbacks for snd_generic platform device */ |
3ae5eaec | 827 | static int snd_generic_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 828 | { |
512bbd6a | 829 | struct snd_card *card; |
1da177e4 | 830 | |
1da177e4 LT |
831 | card = get_snd_generic_card(dev); |
832 | if (card->power_state == SNDRV_CTL_POWER_D3hot) | |
833 | return 0; | |
d5c5d8fe TI |
834 | if (card->pm_suspend) |
835 | card->pm_suspend(card, PMSG_SUSPEND); | |
1da177e4 LT |
836 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); |
837 | return 0; | |
838 | } | |
839 | ||
3ae5eaec | 840 | static int snd_generic_resume(struct platform_device *dev) |
1da177e4 | 841 | { |
512bbd6a | 842 | struct snd_card *card; |
1da177e4 | 843 | |
1da177e4 LT |
844 | card = get_snd_generic_card(dev); |
845 | if (card->power_state == SNDRV_CTL_POWER_D0) | |
846 | return 0; | |
aa92c4af | 847 | if (card->pm_resume) |
d5c5d8fe | 848 | card->pm_resume(card); |
1da177e4 LT |
849 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); |
850 | return 0; | |
851 | } | |
852 | ||
853 | /** | |
854 | * snd_card_set_generic_pm_callback - set the generic power-management callbacks | |
855 | * @card: soundcard structure | |
856 | * @suspend: suspend callback function | |
857 | * @resume: resume callback function | |
858 | * @private_data: private data to pass to the callback functions | |
859 | * | |
860 | * Registers the power-management and sets the lowlevel callbacks for | |
861 | * the given card. These callbacks are called from the ALSA's common | |
862 | * PM handler and from the control API. | |
863 | */ | |
512bbd6a TI |
864 | int snd_card_set_generic_pm_callback(struct snd_card *card, |
865 | int (*suspend)(struct snd_card *, pm_message_t), | |
866 | int (*resume)(struct snd_card *), | |
1da177e4 LT |
867 | void *private_data) |
868 | { | |
ecbcfe36 TI |
869 | int err; |
870 | if ((err = snd_generic_device_register(card)) < 0) | |
871 | return err; | |
872 | return snd_card_set_pm_callback(card, suspend, resume, private_data); | |
1da177e4 | 873 | } |
ecbcfe36 | 874 | #endif /* CONFIG_SND_GENERIC_DRIVER */ |
1da177e4 LT |
875 | |
876 | #ifdef CONFIG_PCI | |
877 | int snd_card_pci_suspend(struct pci_dev *dev, pm_message_t state) | |
878 | { | |
512bbd6a | 879 | struct snd_card *card = pci_get_drvdata(dev); |
1da177e4 LT |
880 | int err; |
881 | if (! card || ! card->pm_suspend) | |
882 | return 0; | |
883 | if (card->power_state == SNDRV_CTL_POWER_D3hot) | |
884 | return 0; | |
885 | err = card->pm_suspend(card, PMSG_SUSPEND); | |
886 | pci_save_state(dev); | |
887 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
888 | return err; | |
889 | } | |
890 | ||
891 | int snd_card_pci_resume(struct pci_dev *dev) | |
892 | { | |
512bbd6a | 893 | struct snd_card *card = pci_get_drvdata(dev); |
1da177e4 LT |
894 | if (! card || ! card->pm_resume) |
895 | return 0; | |
896 | if (card->power_state == SNDRV_CTL_POWER_D0) | |
897 | return 0; | |
898 | /* restore the PCI config space */ | |
899 | pci_restore_state(dev); | |
900 | card->pm_resume(card); | |
901 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
902 | return 0; | |
903 | } | |
904 | #endif | |
905 | ||
906 | #endif /* CONFIG_PM */ |