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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 | 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 | ||
6581f4e7 TI |
41 | static unsigned int snd_cards_lock; /* locked for registering/using */ |
42 | struct snd_card *snd_cards[SNDRV_CARDS]; | |
c0d3fb39 TI |
43 | EXPORT_SYMBOL(snd_cards); |
44 | ||
746df948 | 45 | static DEFINE_MUTEX(snd_card_mutex); |
1da177e4 LT |
46 | |
47 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
512bbd6a | 48 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
c0d3fb39 | 49 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
50 | #endif |
51 | ||
e28563cc | 52 | #ifdef CONFIG_PROC_FS |
512bbd6a TI |
53 | static void snd_card_id_read(struct snd_info_entry *entry, |
54 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
55 | { |
56 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
57 | } | |
58 | ||
e28563cc TI |
59 | static inline int init_info_for_card(struct snd_card *card) |
60 | { | |
61 | int err; | |
62 | struct snd_info_entry *entry; | |
63 | ||
64 | if ((err = snd_info_card_register(card)) < 0) { | |
65 | snd_printd("unable to create card info\n"); | |
66 | return err; | |
67 | } | |
68 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
69 | snd_printd("unable to create card entry\n"); | |
70 | return err; | |
71 | } | |
e28563cc TI |
72 | entry->c.text.read = snd_card_id_read; |
73 | if (snd_info_register(entry) < 0) { | |
74 | snd_info_free_entry(entry); | |
75 | entry = NULL; | |
76 | } | |
77 | card->proc_id = entry; | |
78 | return 0; | |
79 | } | |
80 | #else /* !CONFIG_PROC_FS */ | |
81 | #define init_info_for_card(card) | |
82 | #endif | |
83 | ||
1da177e4 LT |
84 | static void snd_card_free_thread(void * __card); |
85 | ||
86 | /** | |
87 | * snd_card_new - create and initialize a soundcard structure | |
88 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
89 | * @xid: card identification (ASCII string) | |
90 | * @module: top level module for locking | |
91 | * @extra_size: allocate this extra size after the main soundcard structure | |
92 | * | |
93 | * Creates and initializes a soundcard structure. | |
94 | * | |
512bbd6a | 95 | * Returns kmallocated snd_card structure. Creates the ALSA control interface |
1da177e4 LT |
96 | * (which is blocked until snd_card_register function is called). |
97 | */ | |
512bbd6a | 98 | struct snd_card *snd_card_new(int idx, const char *xid, |
1da177e4 LT |
99 | struct module *module, int extra_size) |
100 | { | |
512bbd6a | 101 | struct snd_card *card; |
1da177e4 LT |
102 | int err; |
103 | ||
104 | if (extra_size < 0) | |
105 | extra_size = 0; | |
ca2c0966 | 106 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
1da177e4 LT |
107 | if (card == NULL) |
108 | return NULL; | |
109 | if (xid) { | |
110 | if (!snd_info_check_reserved_words(xid)) | |
111 | goto __error; | |
112 | strlcpy(card->id, xid, sizeof(card->id)); | |
113 | } | |
114 | err = 0; | |
746df948 | 115 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
116 | if (idx < 0) { |
117 | int idx2; | |
118 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
119 | if (~snd_cards_lock & idx & 1<<idx2) { | |
120 | idx = idx2; | |
121 | if (idx >= snd_ecards_limit) | |
122 | snd_ecards_limit = idx + 1; | |
123 | break; | |
124 | } | |
125 | } else if (idx < snd_ecards_limit) { | |
126 | if (snd_cards_lock & (1 << idx)) | |
127 | err = -ENODEV; /* invalid */ | |
128 | } else if (idx < SNDRV_CARDS) | |
129 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
130 | else | |
131 | err = -ENODEV; | |
132 | if (idx < 0 || err < 0) { | |
746df948 | 133 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
134 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); |
135 | goto __error; | |
136 | } | |
137 | snd_cards_lock |= 1 << idx; /* lock it */ | |
746df948 | 138 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
139 | card->number = idx; |
140 | card->module = module; | |
141 | INIT_LIST_HEAD(&card->devices); | |
142 | init_rwsem(&card->controls_rwsem); | |
143 | rwlock_init(&card->ctl_files_rwlock); | |
144 | INIT_LIST_HEAD(&card->controls); | |
145 | INIT_LIST_HEAD(&card->ctl_files); | |
146 | spin_lock_init(&card->files_lock); | |
147 | init_waitqueue_head(&card->shutdown_sleep); | |
148 | INIT_WORK(&card->free_workq, snd_card_free_thread, card); | |
149 | #ifdef CONFIG_PM | |
1a60d4c5 | 150 | mutex_init(&card->power_lock); |
1da177e4 LT |
151 | init_waitqueue_head(&card->power_sleep); |
152 | #endif | |
153 | /* the control interface cannot be accessed from the user space until */ | |
154 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
155 | if ((err = snd_ctl_create(card)) < 0) { | |
156 | snd_printd("unable to register control minors\n"); | |
157 | goto __error; | |
158 | } | |
159 | if ((err = snd_info_card_create(card)) < 0) { | |
160 | snd_printd("unable to create card info\n"); | |
161 | goto __error_ctl; | |
162 | } | |
163 | if (extra_size > 0) | |
512bbd6a | 164 | card->private_data = (char *)card + sizeof(struct snd_card); |
1da177e4 LT |
165 | return card; |
166 | ||
167 | __error_ctl: | |
168 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
169 | __error: | |
170 | kfree(card); | |
171 | return NULL; | |
172 | } | |
173 | ||
c0d3fb39 TI |
174 | EXPORT_SYMBOL(snd_card_new); |
175 | ||
746df948 TI |
176 | /* return non-zero if a card is already locked */ |
177 | int snd_card_locked(int card) | |
178 | { | |
179 | int locked; | |
180 | ||
181 | mutex_lock(&snd_card_mutex); | |
182 | locked = snd_cards_lock & (1 << card); | |
183 | mutex_unlock(&snd_card_mutex); | |
184 | return locked; | |
185 | } | |
186 | ||
b3b0abe1 CL |
187 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
188 | { | |
189 | return -ENODEV; | |
190 | } | |
191 | ||
192 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
193 | size_t count, loff_t *offset) | |
194 | { | |
195 | return -ENODEV; | |
196 | } | |
197 | ||
198 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
199 | size_t count, loff_t *offset) | |
200 | { | |
201 | return -ENODEV; | |
202 | } | |
203 | ||
1da177e4 LT |
204 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
205 | { | |
206 | return POLLERR | POLLNVAL; | |
207 | } | |
208 | ||
b3b0abe1 CL |
209 | static long snd_disconnect_ioctl(struct file *file, |
210 | unsigned int cmd, unsigned long arg) | |
211 | { | |
212 | return -ENODEV; | |
213 | } | |
214 | ||
215 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
216 | { | |
217 | return -ENODEV; | |
218 | } | |
219 | ||
220 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
221 | { | |
222 | return -ENODEV; | |
223 | } | |
224 | ||
1da177e4 LT |
225 | /** |
226 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
227 | * @card: soundcard structure | |
228 | * | |
229 | * Disconnects all APIs from the file-operations (user space). | |
230 | * | |
231 | * Returns zero, otherwise a negative error code. | |
232 | * | |
233 | * Note: The current implementation replaces all active file->f_op with special | |
234 | * dummy file operations (they do nothing except release). | |
235 | */ | |
512bbd6a | 236 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
237 | { |
238 | struct snd_monitor_file *mfile; | |
239 | struct file *file; | |
240 | struct snd_shutdown_f_ops *s_f_ops; | |
99ac48f5 AV |
241 | struct file_operations *f_ops; |
242 | const struct file_operations *old_f_ops; | |
1da177e4 LT |
243 | int err; |
244 | ||
245 | spin_lock(&card->files_lock); | |
246 | if (card->shutdown) { | |
247 | spin_unlock(&card->files_lock); | |
248 | return 0; | |
249 | } | |
250 | card->shutdown = 1; | |
251 | spin_unlock(&card->files_lock); | |
252 | ||
253 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 254 | mutex_lock(&snd_card_mutex); |
1da177e4 | 255 | snd_cards[card->number] = NULL; |
746df948 | 256 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
257 | |
258 | /* phase 2: replace file->f_op with special dummy operations */ | |
259 | ||
260 | spin_lock(&card->files_lock); | |
261 | mfile = card->files; | |
262 | while (mfile) { | |
263 | file = mfile->file; | |
264 | ||
265 | /* it's critical part, use endless loop */ | |
266 | /* we have no room to fail */ | |
267 | s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); | |
268 | if (s_f_ops == NULL) | |
269 | panic("Atomic allocation failed for snd_shutdown_f_ops!"); | |
270 | ||
271 | f_ops = &s_f_ops->f_ops; | |
272 | ||
273 | memset(f_ops, 0, sizeof(*f_ops)); | |
274 | f_ops->owner = file->f_op->owner; | |
275 | f_ops->release = file->f_op->release; | |
b3b0abe1 CL |
276 | f_ops->llseek = snd_disconnect_llseek; |
277 | f_ops->read = snd_disconnect_read; | |
278 | f_ops->write = snd_disconnect_write; | |
1da177e4 | 279 | f_ops->poll = snd_disconnect_poll; |
b3b0abe1 CL |
280 | f_ops->unlocked_ioctl = snd_disconnect_ioctl; |
281 | #ifdef CONFIG_COMPAT | |
282 | f_ops->compat_ioctl = snd_disconnect_ioctl; | |
283 | #endif | |
284 | f_ops->mmap = snd_disconnect_mmap; | |
285 | f_ops->fasync = snd_disconnect_fasync; | |
1da177e4 LT |
286 | |
287 | s_f_ops->next = card->s_f_ops; | |
288 | card->s_f_ops = s_f_ops; | |
289 | ||
290 | f_ops = fops_get(f_ops); | |
291 | ||
292 | old_f_ops = file->f_op; | |
293 | file->f_op = f_ops; /* must be atomic */ | |
294 | fops_put(old_f_ops); | |
295 | ||
296 | mfile = mfile->next; | |
297 | } | |
298 | spin_unlock(&card->files_lock); | |
299 | ||
300 | /* phase 3: notify all connected devices about disconnection */ | |
301 | /* at this point, they cannot respond to any calls except release() */ | |
302 | ||
303 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
304 | if (snd_mixer_oss_notify_callback) | |
305 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
306 | #endif | |
307 | ||
308 | /* notify all devices that we are disconnected */ | |
309 | err = snd_device_disconnect_all(card); | |
310 | if (err < 0) | |
311 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
c0d3fb39 TI |
316 | EXPORT_SYMBOL(snd_card_disconnect); |
317 | ||
1da177e4 LT |
318 | /** |
319 | * snd_card_free - frees given soundcard structure | |
320 | * @card: soundcard structure | |
321 | * | |
322 | * This function releases the soundcard structure and the all assigned | |
323 | * devices automatically. That is, you don't have to release the devices | |
324 | * by yourself. | |
325 | * | |
326 | * Returns zero. Frees all associated devices and frees the control | |
327 | * interface associated to given soundcard. | |
328 | */ | |
512bbd6a | 329 | int snd_card_free(struct snd_card *card) |
1da177e4 LT |
330 | { |
331 | struct snd_shutdown_f_ops *s_f_ops; | |
332 | ||
333 | if (card == NULL) | |
334 | return -EINVAL; | |
746df948 | 335 | mutex_lock(&snd_card_mutex); |
1da177e4 | 336 | snd_cards[card->number] = NULL; |
746df948 | 337 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
338 | |
339 | #ifdef CONFIG_PM | |
340 | wake_up(&card->power_sleep); | |
1da177e4 | 341 | #endif |
1da177e4 LT |
342 | /* wait, until all devices are ready for the free operation */ |
343 | wait_event(card->shutdown_sleep, card->files == NULL); | |
344 | ||
345 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
346 | if (snd_mixer_oss_notify_callback) | |
347 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
348 | #endif | |
349 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
350 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
351 | /* Fatal, but this situation should never occur */ | |
352 | } | |
353 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
354 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
355 | /* Fatal, but this situation should never occur */ | |
356 | } | |
357 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
358 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
359 | /* Fatal, but this situation should never occur */ | |
360 | } | |
361 | if (card->private_free) | |
362 | card->private_free(card); | |
e28563cc | 363 | snd_info_unregister(card->proc_id); |
1da177e4 LT |
364 | if (snd_info_card_free(card) < 0) { |
365 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
366 | /* Not fatal error */ | |
367 | } | |
368 | while (card->s_f_ops) { | |
369 | s_f_ops = card->s_f_ops; | |
370 | card->s_f_ops = s_f_ops->next; | |
371 | kfree(s_f_ops); | |
372 | } | |
746df948 | 373 | mutex_lock(&snd_card_mutex); |
1da177e4 | 374 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 375 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
376 | kfree(card); |
377 | return 0; | |
378 | } | |
379 | ||
c0d3fb39 TI |
380 | EXPORT_SYMBOL(snd_card_free); |
381 | ||
1da177e4 LT |
382 | static void snd_card_free_thread(void * __card) |
383 | { | |
512bbd6a | 384 | struct snd_card *card = __card; |
1da177e4 LT |
385 | struct module * module = card->module; |
386 | ||
387 | if (!try_module_get(module)) { | |
388 | snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); | |
389 | module = NULL; | |
390 | } | |
391 | ||
392 | snd_card_free(card); | |
393 | ||
394 | module_put(module); | |
395 | } | |
396 | ||
397 | /** | |
398 | * snd_card_free_in_thread - call snd_card_free() in thread | |
399 | * @card: soundcard structure | |
400 | * | |
401 | * This function schedules the call of snd_card_free() function in a | |
402 | * work queue. When all devices are released (non-busy), the work | |
403 | * is woken up and calls snd_card_free(). | |
404 | * | |
405 | * When a card can be disconnected at any time by hotplug service, | |
406 | * this function should be used in disconnect (or detach) callback | |
407 | * instead of calling snd_card_free() directly. | |
408 | * | |
409 | * Returns - zero otherwise a negative error code if the start of thread failed. | |
410 | */ | |
512bbd6a | 411 | int snd_card_free_in_thread(struct snd_card *card) |
1da177e4 LT |
412 | { |
413 | if (card->files == NULL) { | |
414 | snd_card_free(card); | |
415 | return 0; | |
416 | } | |
417 | ||
418 | if (schedule_work(&card->free_workq)) | |
419 | return 0; | |
420 | ||
421 | snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); | |
422 | /* try to free the structure immediately */ | |
423 | snd_card_free(card); | |
424 | return -EFAULT; | |
425 | } | |
426 | ||
c0d3fb39 TI |
427 | EXPORT_SYMBOL(snd_card_free_in_thread); |
428 | ||
512bbd6a | 429 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 430 | { |
d001544d | 431 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
432 | char *id, *spos; |
433 | ||
434 | id = spos = card->shortname; | |
435 | while (*id != '\0') { | |
436 | if (*id == ' ') | |
437 | spos = id + 1; | |
438 | id++; | |
439 | } | |
440 | id = card->id; | |
441 | while (*spos != '\0' && !isalnum(*spos)) | |
442 | spos++; | |
443 | if (isdigit(*spos)) | |
444 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
445 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
446 | if (isalnum(*spos)) | |
447 | *id++ = *spos; | |
448 | spos++; | |
449 | } | |
450 | *id = '\0'; | |
451 | ||
452 | id = card->id; | |
453 | ||
454 | if (*id == '\0') | |
455 | strcpy(id, "default"); | |
456 | ||
457 | while (1) { | |
458 | if (loops-- == 0) { | |
459 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
460 | strcpy(card->id, card->proc_root->name); | |
461 | return; | |
462 | } | |
463 | if (!snd_info_check_reserved_words(id)) | |
464 | goto __change; | |
465 | for (i = 0; i < snd_ecards_limit; i++) { | |
466 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
467 | goto __change; | |
468 | } | |
469 | break; | |
470 | ||
471 | __change: | |
472 | len = strlen(id); | |
d001544d CL |
473 | if (idx_flag) { |
474 | if (id[len-1] != '9') | |
475 | id[len-1]++; | |
476 | else | |
477 | id[len-1] = 'A'; | |
478 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
479 | strcat(id, "_1"); |
480 | idx_flag++; | |
481 | } else { | |
482 | spos = id + len - 2; | |
483 | if ((size_t)len <= sizeof(card->id) - 2) | |
484 | spos++; | |
485 | *spos++ = '_'; | |
486 | *spos++ = '1'; | |
487 | *spos++ = '\0'; | |
488 | idx_flag++; | |
489 | } | |
490 | } | |
491 | } | |
492 | ||
493 | /** | |
494 | * snd_card_register - register the soundcard | |
495 | * @card: soundcard structure | |
496 | * | |
497 | * This function registers all the devices assigned to the soundcard. | |
498 | * Until calling this, the ALSA control interface is blocked from the | |
499 | * external accesses. Thus, you should call this function at the end | |
500 | * of the initialization of the card. | |
501 | * | |
502 | * Returns zero otherwise a negative error code if the registrain failed. | |
503 | */ | |
512bbd6a | 504 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
505 | { |
506 | int err; | |
1da177e4 | 507 | |
7c22f1aa | 508 | snd_assert(card != NULL, return -EINVAL); |
1da177e4 LT |
509 | if ((err = snd_device_register_all(card)) < 0) |
510 | return err; | |
746df948 | 511 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
512 | if (snd_cards[card->number]) { |
513 | /* already registered */ | |
746df948 | 514 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
515 | return 0; |
516 | } | |
517 | if (card->id[0] == '\0') | |
518 | choose_default_id(card); | |
519 | snd_cards[card->number] = card; | |
746df948 | 520 | mutex_unlock(&snd_card_mutex); |
e28563cc | 521 | init_info_for_card(card); |
1da177e4 LT |
522 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
523 | if (snd_mixer_oss_notify_callback) | |
524 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
525 | #endif | |
526 | return 0; | |
527 | } | |
528 | ||
c0d3fb39 TI |
529 | EXPORT_SYMBOL(snd_card_register); |
530 | ||
e28563cc | 531 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 532 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 533 | |
a381a7a6 TI |
534 | static void snd_card_info_read(struct snd_info_entry *entry, |
535 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
536 | { |
537 | int idx, count; | |
512bbd6a | 538 | struct snd_card *card; |
1da177e4 LT |
539 | |
540 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 541 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
542 | if ((card = snd_cards[idx]) != NULL) { |
543 | count++; | |
d001544d | 544 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
545 | idx, |
546 | card->id, | |
547 | card->driver, | |
548 | card->shortname); | |
d001544d | 549 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
550 | card->longname); |
551 | } | |
746df948 | 552 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
553 | } |
554 | if (!count) | |
555 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
556 | } | |
557 | ||
e28563cc | 558 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 559 | |
512bbd6a | 560 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
561 | { |
562 | int idx, count; | |
512bbd6a | 563 | struct snd_card *card; |
1da177e4 LT |
564 | |
565 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 566 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
567 | if ((card = snd_cards[idx]) != NULL) { |
568 | count++; | |
569 | snd_iprintf(buffer, "%s\n", card->longname); | |
570 | } | |
746df948 | 571 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
572 | } |
573 | if (!count) { | |
574 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
575 | } | |
576 | } | |
577 | ||
578 | #endif | |
579 | ||
580 | #ifdef MODULE | |
512bbd6a TI |
581 | static struct snd_info_entry *snd_card_module_info_entry; |
582 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
583 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
584 | { |
585 | int idx; | |
512bbd6a | 586 | struct snd_card *card; |
1da177e4 LT |
587 | |
588 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 589 | mutex_lock(&snd_card_mutex); |
1da177e4 | 590 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
591 | snd_iprintf(buffer, "%2i %s\n", |
592 | idx, card->module->name); | |
746df948 | 593 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
594 | } |
595 | } | |
596 | #endif | |
597 | ||
598 | int __init snd_card_info_init(void) | |
599 | { | |
512bbd6a | 600 | struct snd_info_entry *entry; |
1da177e4 LT |
601 | |
602 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
603 | if (! entry) |
604 | return -ENOMEM; | |
1da177e4 LT |
605 | entry->c.text.read = snd_card_info_read; |
606 | if (snd_info_register(entry) < 0) { | |
607 | snd_info_free_entry(entry); | |
608 | return -ENOMEM; | |
609 | } | |
610 | snd_card_info_entry = entry; | |
611 | ||
612 | #ifdef MODULE | |
613 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
614 | if (entry) { | |
1da177e4 LT |
615 | entry->c.text.read = snd_card_module_info_read; |
616 | if (snd_info_register(entry) < 0) | |
617 | snd_info_free_entry(entry); | |
618 | else | |
619 | snd_card_module_info_entry = entry; | |
620 | } | |
621 | #endif | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
626 | int __exit snd_card_info_done(void) | |
627 | { | |
e28563cc | 628 | snd_info_unregister(snd_card_info_entry); |
1da177e4 | 629 | #ifdef MODULE |
e28563cc | 630 | snd_info_unregister(snd_card_module_info_entry); |
1da177e4 LT |
631 | #endif |
632 | return 0; | |
633 | } | |
634 | ||
e28563cc TI |
635 | #endif /* CONFIG_PROC_FS */ |
636 | ||
1da177e4 LT |
637 | /** |
638 | * snd_component_add - add a component string | |
639 | * @card: soundcard structure | |
640 | * @component: the component id string | |
641 | * | |
642 | * This function adds the component id string to the supported list. | |
643 | * The component can be referred from the alsa-lib. | |
644 | * | |
645 | * Returns zero otherwise a negative error code. | |
646 | */ | |
647 | ||
512bbd6a | 648 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
649 | { |
650 | char *ptr; | |
651 | int len = strlen(component); | |
652 | ||
653 | ptr = strstr(card->components, component); | |
654 | if (ptr != NULL) { | |
655 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
656 | return 1; | |
657 | } | |
658 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
659 | snd_BUG(); | |
660 | return -ENOMEM; | |
661 | } | |
662 | if (card->components[0] != '\0') | |
663 | strcat(card->components, " "); | |
664 | strcat(card->components, component); | |
665 | return 0; | |
666 | } | |
667 | ||
c0d3fb39 TI |
668 | EXPORT_SYMBOL(snd_component_add); |
669 | ||
1da177e4 LT |
670 | /** |
671 | * snd_card_file_add - add the file to the file list of the card | |
672 | * @card: soundcard structure | |
673 | * @file: file pointer | |
674 | * | |
675 | * This function adds the file to the file linked-list of the card. | |
676 | * This linked-list is used to keep tracking the connection state, | |
677 | * and to avoid the release of busy resources by hotplug. | |
678 | * | |
679 | * Returns zero or a negative error code. | |
680 | */ | |
512bbd6a | 681 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
682 | { |
683 | struct snd_monitor_file *mfile; | |
684 | ||
685 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
686 | if (mfile == NULL) | |
687 | return -ENOMEM; | |
688 | mfile->file = file; | |
689 | mfile->next = NULL; | |
690 | spin_lock(&card->files_lock); | |
691 | if (card->shutdown) { | |
692 | spin_unlock(&card->files_lock); | |
693 | kfree(mfile); | |
694 | return -ENODEV; | |
695 | } | |
696 | mfile->next = card->files; | |
697 | card->files = mfile; | |
698 | spin_unlock(&card->files_lock); | |
699 | return 0; | |
700 | } | |
701 | ||
c0d3fb39 TI |
702 | EXPORT_SYMBOL(snd_card_file_add); |
703 | ||
1da177e4 LT |
704 | /** |
705 | * snd_card_file_remove - remove the file from the file list | |
706 | * @card: soundcard structure | |
707 | * @file: file pointer | |
708 | * | |
709 | * This function removes the file formerly added to the card via | |
710 | * snd_card_file_add() function. | |
711 | * If all files are removed and the release of the card is | |
712 | * scheduled, it will wake up the the thread to call snd_card_free() | |
713 | * (see snd_card_free_in_thread() function). | |
714 | * | |
715 | * Returns zero or a negative error code. | |
716 | */ | |
512bbd6a | 717 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
718 | { |
719 | struct snd_monitor_file *mfile, *pfile = NULL; | |
720 | ||
721 | spin_lock(&card->files_lock); | |
722 | mfile = card->files; | |
723 | while (mfile) { | |
724 | if (mfile->file == file) { | |
725 | if (pfile) | |
726 | pfile->next = mfile->next; | |
727 | else | |
728 | card->files = mfile->next; | |
729 | break; | |
730 | } | |
731 | pfile = mfile; | |
732 | mfile = mfile->next; | |
733 | } | |
734 | spin_unlock(&card->files_lock); | |
735 | if (card->files == NULL) | |
736 | wake_up(&card->shutdown_sleep); | |
737 | if (!mfile) { | |
738 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
739 | return -ENOENT; | |
740 | } | |
741 | kfree(mfile); | |
742 | return 0; | |
743 | } | |
744 | ||
c0d3fb39 TI |
745 | EXPORT_SYMBOL(snd_card_file_remove); |
746 | ||
1da177e4 LT |
747 | #ifdef CONFIG_PM |
748 | /** | |
749 | * snd_power_wait - wait until the power-state is changed. | |
750 | * @card: soundcard structure | |
751 | * @power_state: expected power state | |
1da177e4 LT |
752 | * |
753 | * Waits until the power-state is changed. | |
754 | * | |
755 | * Note: the power lock must be active before call. | |
756 | */ | |
cbac4b0c | 757 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
758 | { |
759 | wait_queue_t wait; | |
760 | int result = 0; | |
761 | ||
762 | /* fastpath */ | |
763 | if (snd_power_get_state(card) == power_state) | |
764 | return 0; | |
765 | init_waitqueue_entry(&wait, current); | |
766 | add_wait_queue(&card->power_sleep, &wait); | |
767 | while (1) { | |
768 | if (card->shutdown) { | |
769 | result = -ENODEV; | |
770 | break; | |
771 | } | |
772 | if (snd_power_get_state(card) == power_state) | |
773 | break; | |
1da177e4 LT |
774 | set_current_state(TASK_UNINTERRUPTIBLE); |
775 | snd_power_unlock(card); | |
776 | schedule_timeout(30 * HZ); | |
777 | snd_power_lock(card); | |
778 | } | |
779 | remove_wait_queue(&card->power_sleep, &wait); | |
780 | return result; | |
781 | } | |
782 | ||
c0d3fb39 | 783 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 784 | #endif /* CONFIG_PM */ |