Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Initialization routines | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
4 | * | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <sound/driver.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/file.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/ctype.h> | |
29 | #include <linux/pci.h> | |
30 | #include <linux/pm.h> | |
d052d1be | 31 | |
1da177e4 LT |
32 | #include <sound/core.h> |
33 | #include <sound/control.h> | |
34 | #include <sound/info.h> | |
35 | ||
36 | struct snd_shutdown_f_ops { | |
37 | struct file_operations f_ops; | |
38 | struct snd_shutdown_f_ops *next; | |
39 | }; | |
40 | ||
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 | /** |
85 | * snd_card_new - create and initialize a soundcard structure | |
86 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
87 | * @xid: card identification (ASCII string) | |
88 | * @module: top level module for locking | |
89 | * @extra_size: allocate this extra size after the main soundcard structure | |
90 | * | |
91 | * Creates and initializes a soundcard structure. | |
92 | * | |
512bbd6a | 93 | * Returns kmallocated snd_card structure. Creates the ALSA control interface |
1da177e4 LT |
94 | * (which is blocked until snd_card_register function is called). |
95 | */ | |
512bbd6a | 96 | struct snd_card *snd_card_new(int idx, const char *xid, |
1da177e4 LT |
97 | struct module *module, int extra_size) |
98 | { | |
512bbd6a | 99 | struct snd_card *card; |
1da177e4 LT |
100 | int err; |
101 | ||
102 | if (extra_size < 0) | |
103 | extra_size = 0; | |
ca2c0966 | 104 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
1da177e4 LT |
105 | if (card == NULL) |
106 | return NULL; | |
107 | if (xid) { | |
108 | if (!snd_info_check_reserved_words(xid)) | |
109 | goto __error; | |
110 | strlcpy(card->id, xid, sizeof(card->id)); | |
111 | } | |
112 | err = 0; | |
746df948 | 113 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
114 | if (idx < 0) { |
115 | int idx2; | |
116 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
117 | if (~snd_cards_lock & idx & 1<<idx2) { | |
118 | idx = idx2; | |
119 | if (idx >= snd_ecards_limit) | |
120 | snd_ecards_limit = idx + 1; | |
121 | break; | |
122 | } | |
123 | } else if (idx < snd_ecards_limit) { | |
124 | if (snd_cards_lock & (1 << idx)) | |
125 | err = -ENODEV; /* invalid */ | |
126 | } else if (idx < SNDRV_CARDS) | |
127 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
128 | else | |
129 | err = -ENODEV; | |
130 | if (idx < 0 || err < 0) { | |
746df948 | 131 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
132 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); |
133 | goto __error; | |
134 | } | |
135 | snd_cards_lock |= 1 << idx; /* lock it */ | |
746df948 | 136 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
137 | card->number = idx; |
138 | card->module = module; | |
139 | INIT_LIST_HEAD(&card->devices); | |
140 | init_rwsem(&card->controls_rwsem); | |
141 | rwlock_init(&card->ctl_files_rwlock); | |
142 | INIT_LIST_HEAD(&card->controls); | |
143 | INIT_LIST_HEAD(&card->ctl_files); | |
144 | spin_lock_init(&card->files_lock); | |
145 | init_waitqueue_head(&card->shutdown_sleep); | |
1da177e4 | 146 | #ifdef CONFIG_PM |
1a60d4c5 | 147 | mutex_init(&card->power_lock); |
1da177e4 LT |
148 | init_waitqueue_head(&card->power_sleep); |
149 | #endif | |
150 | /* the control interface cannot be accessed from the user space until */ | |
151 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
152 | if ((err = snd_ctl_create(card)) < 0) { | |
153 | snd_printd("unable to register control minors\n"); | |
154 | goto __error; | |
155 | } | |
156 | if ((err = snd_info_card_create(card)) < 0) { | |
157 | snd_printd("unable to create card info\n"); | |
158 | goto __error_ctl; | |
159 | } | |
160 | if (extra_size > 0) | |
512bbd6a | 161 | card->private_data = (char *)card + sizeof(struct snd_card); |
1da177e4 LT |
162 | return card; |
163 | ||
164 | __error_ctl: | |
165 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
166 | __error: | |
167 | kfree(card); | |
168 | return NULL; | |
169 | } | |
170 | ||
c0d3fb39 TI |
171 | EXPORT_SYMBOL(snd_card_new); |
172 | ||
746df948 TI |
173 | /* return non-zero if a card is already locked */ |
174 | int snd_card_locked(int card) | |
175 | { | |
176 | int locked; | |
177 | ||
178 | mutex_lock(&snd_card_mutex); | |
179 | locked = snd_cards_lock & (1 << card); | |
180 | mutex_unlock(&snd_card_mutex); | |
181 | return locked; | |
182 | } | |
183 | ||
b3b0abe1 CL |
184 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
185 | { | |
186 | return -ENODEV; | |
187 | } | |
188 | ||
189 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
190 | size_t count, loff_t *offset) | |
191 | { | |
192 | return -ENODEV; | |
193 | } | |
194 | ||
195 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
196 | size_t count, loff_t *offset) | |
197 | { | |
198 | return -ENODEV; | |
199 | } | |
200 | ||
1da177e4 LT |
201 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
202 | { | |
203 | return POLLERR | POLLNVAL; | |
204 | } | |
205 | ||
b3b0abe1 CL |
206 | static long snd_disconnect_ioctl(struct file *file, |
207 | unsigned int cmd, unsigned long arg) | |
208 | { | |
209 | return -ENODEV; | |
210 | } | |
211 | ||
212 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
213 | { | |
214 | return -ENODEV; | |
215 | } | |
216 | ||
217 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
218 | { | |
219 | return -ENODEV; | |
220 | } | |
221 | ||
1da177e4 LT |
222 | /** |
223 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
224 | * @card: soundcard structure | |
225 | * | |
226 | * Disconnects all APIs from the file-operations (user space). | |
227 | * | |
228 | * Returns zero, otherwise a negative error code. | |
229 | * | |
230 | * Note: The current implementation replaces all active file->f_op with special | |
231 | * dummy file operations (they do nothing except release). | |
232 | */ | |
512bbd6a | 233 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
234 | { |
235 | struct snd_monitor_file *mfile; | |
236 | struct file *file; | |
237 | struct snd_shutdown_f_ops *s_f_ops; | |
99ac48f5 AV |
238 | struct file_operations *f_ops; |
239 | const struct file_operations *old_f_ops; | |
1da177e4 LT |
240 | int err; |
241 | ||
242 | spin_lock(&card->files_lock); | |
243 | if (card->shutdown) { | |
244 | spin_unlock(&card->files_lock); | |
245 | return 0; | |
246 | } | |
247 | card->shutdown = 1; | |
248 | spin_unlock(&card->files_lock); | |
249 | ||
250 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 251 | mutex_lock(&snd_card_mutex); |
1da177e4 | 252 | snd_cards[card->number] = NULL; |
746df948 | 253 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
254 | |
255 | /* phase 2: replace file->f_op with special dummy operations */ | |
256 | ||
257 | spin_lock(&card->files_lock); | |
258 | mfile = card->files; | |
259 | while (mfile) { | |
260 | file = mfile->file; | |
261 | ||
262 | /* it's critical part, use endless loop */ | |
263 | /* we have no room to fail */ | |
264 | s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); | |
265 | if (s_f_ops == NULL) | |
266 | panic("Atomic allocation failed for snd_shutdown_f_ops!"); | |
267 | ||
268 | f_ops = &s_f_ops->f_ops; | |
269 | ||
270 | memset(f_ops, 0, sizeof(*f_ops)); | |
271 | f_ops->owner = file->f_op->owner; | |
272 | f_ops->release = file->f_op->release; | |
b3b0abe1 CL |
273 | f_ops->llseek = snd_disconnect_llseek; |
274 | f_ops->read = snd_disconnect_read; | |
275 | f_ops->write = snd_disconnect_write; | |
1da177e4 | 276 | f_ops->poll = snd_disconnect_poll; |
b3b0abe1 CL |
277 | f_ops->unlocked_ioctl = snd_disconnect_ioctl; |
278 | #ifdef CONFIG_COMPAT | |
279 | f_ops->compat_ioctl = snd_disconnect_ioctl; | |
280 | #endif | |
281 | f_ops->mmap = snd_disconnect_mmap; | |
282 | f_ops->fasync = snd_disconnect_fasync; | |
1da177e4 LT |
283 | |
284 | s_f_ops->next = card->s_f_ops; | |
285 | card->s_f_ops = s_f_ops; | |
286 | ||
287 | f_ops = fops_get(f_ops); | |
288 | ||
289 | old_f_ops = file->f_op; | |
290 | file->f_op = f_ops; /* must be atomic */ | |
291 | fops_put(old_f_ops); | |
292 | ||
293 | mfile = mfile->next; | |
294 | } | |
295 | spin_unlock(&card->files_lock); | |
296 | ||
297 | /* phase 3: notify all connected devices about disconnection */ | |
298 | /* at this point, they cannot respond to any calls except release() */ | |
299 | ||
300 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
301 | if (snd_mixer_oss_notify_callback) | |
302 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
303 | #endif | |
304 | ||
305 | /* notify all devices that we are disconnected */ | |
306 | err = snd_device_disconnect_all(card); | |
307 | if (err < 0) | |
308 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
309 | ||
746d4a02 | 310 | snd_info_card_disconnect(card); |
1da177e4 LT |
311 | return 0; |
312 | } | |
313 | ||
c0d3fb39 TI |
314 | EXPORT_SYMBOL(snd_card_disconnect); |
315 | ||
1da177e4 LT |
316 | /** |
317 | * snd_card_free - frees given soundcard structure | |
318 | * @card: soundcard structure | |
319 | * | |
320 | * This function releases the soundcard structure and the all assigned | |
321 | * devices automatically. That is, you don't have to release the devices | |
322 | * by yourself. | |
323 | * | |
324 | * Returns zero. Frees all associated devices and frees the control | |
325 | * interface associated to given soundcard. | |
326 | */ | |
c461482c | 327 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 LT |
328 | { |
329 | struct snd_shutdown_f_ops *s_f_ops; | |
330 | ||
1da177e4 LT |
331 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
332 | if (snd_mixer_oss_notify_callback) | |
333 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
334 | #endif | |
335 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
336 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
337 | /* Fatal, but this situation should never occur */ | |
338 | } | |
339 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
340 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
341 | /* Fatal, but this situation should never occur */ | |
342 | } | |
343 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
344 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
345 | /* Fatal, but this situation should never occur */ | |
346 | } | |
347 | if (card->private_free) | |
348 | card->private_free(card); | |
746d4a02 | 349 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
350 | if (snd_info_card_free(card) < 0) { |
351 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
352 | /* Not fatal error */ | |
353 | } | |
354 | while (card->s_f_ops) { | |
355 | s_f_ops = card->s_f_ops; | |
356 | card->s_f_ops = s_f_ops->next; | |
357 | kfree(s_f_ops); | |
358 | } | |
c461482c TI |
359 | kfree(card); |
360 | return 0; | |
361 | } | |
362 | ||
363 | static int snd_card_free_prepare(struct snd_card *card) | |
364 | { | |
365 | if (card == NULL) | |
366 | return -EINVAL; | |
367 | (void) snd_card_disconnect(card); | |
746df948 | 368 | mutex_lock(&snd_card_mutex); |
c461482c | 369 | snd_cards[card->number] = NULL; |
1da177e4 | 370 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 371 | mutex_unlock(&snd_card_mutex); |
c461482c TI |
372 | #ifdef CONFIG_PM |
373 | wake_up(&card->power_sleep); | |
374 | #endif | |
375 | return 0; | |
376 | } | |
377 | ||
378 | int snd_card_free_when_closed(struct snd_card *card) | |
379 | { | |
380 | int free_now = 0; | |
381 | int ret = snd_card_free_prepare(card); | |
382 | if (ret) | |
383 | return ret; | |
384 | ||
385 | spin_lock(&card->files_lock); | |
386 | if (card->files == NULL) | |
387 | free_now = 1; | |
388 | else | |
389 | card->free_on_last_close = 1; | |
390 | spin_unlock(&card->files_lock); | |
391 | ||
392 | if (free_now) | |
393 | snd_card_do_free(card); | |
394 | return 0; | |
395 | } | |
396 | ||
397 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
398 | ||
399 | int snd_card_free(struct snd_card *card) | |
400 | { | |
401 | int ret = snd_card_free_prepare(card); | |
402 | if (ret) | |
403 | return ret; | |
404 | ||
405 | /* wait, until all devices are ready for the free operation */ | |
406 | wait_event(card->shutdown_sleep, card->files == NULL); | |
407 | snd_card_do_free(card); | |
1da177e4 LT |
408 | return 0; |
409 | } | |
410 | ||
c0d3fb39 TI |
411 | EXPORT_SYMBOL(snd_card_free); |
412 | ||
512bbd6a | 413 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 414 | { |
d001544d | 415 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
416 | char *id, *spos; |
417 | ||
418 | id = spos = card->shortname; | |
419 | while (*id != '\0') { | |
420 | if (*id == ' ') | |
421 | spos = id + 1; | |
422 | id++; | |
423 | } | |
424 | id = card->id; | |
425 | while (*spos != '\0' && !isalnum(*spos)) | |
426 | spos++; | |
427 | if (isdigit(*spos)) | |
428 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
429 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
430 | if (isalnum(*spos)) | |
431 | *id++ = *spos; | |
432 | spos++; | |
433 | } | |
434 | *id = '\0'; | |
435 | ||
436 | id = card->id; | |
437 | ||
438 | if (*id == '\0') | |
439 | strcpy(id, "default"); | |
440 | ||
441 | while (1) { | |
442 | if (loops-- == 0) { | |
443 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
444 | strcpy(card->id, card->proc_root->name); | |
445 | return; | |
446 | } | |
447 | if (!snd_info_check_reserved_words(id)) | |
448 | goto __change; | |
449 | for (i = 0; i < snd_ecards_limit; i++) { | |
450 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
451 | goto __change; | |
452 | } | |
453 | break; | |
454 | ||
455 | __change: | |
456 | len = strlen(id); | |
d001544d CL |
457 | if (idx_flag) { |
458 | if (id[len-1] != '9') | |
459 | id[len-1]++; | |
460 | else | |
461 | id[len-1] = 'A'; | |
462 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
463 | strcat(id, "_1"); |
464 | idx_flag++; | |
465 | } else { | |
466 | spos = id + len - 2; | |
467 | if ((size_t)len <= sizeof(card->id) - 2) | |
468 | spos++; | |
469 | *spos++ = '_'; | |
470 | *spos++ = '1'; | |
471 | *spos++ = '\0'; | |
472 | idx_flag++; | |
473 | } | |
474 | } | |
475 | } | |
476 | ||
477 | /** | |
478 | * snd_card_register - register the soundcard | |
479 | * @card: soundcard structure | |
480 | * | |
481 | * This function registers all the devices assigned to the soundcard. | |
482 | * Until calling this, the ALSA control interface is blocked from the | |
483 | * external accesses. Thus, you should call this function at the end | |
484 | * of the initialization of the card. | |
485 | * | |
486 | * Returns zero otherwise a negative error code if the registrain failed. | |
487 | */ | |
512bbd6a | 488 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
489 | { |
490 | int err; | |
1da177e4 | 491 | |
7c22f1aa | 492 | snd_assert(card != NULL, return -EINVAL); |
1da177e4 LT |
493 | if ((err = snd_device_register_all(card)) < 0) |
494 | return err; | |
746df948 | 495 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
496 | if (snd_cards[card->number]) { |
497 | /* already registered */ | |
746df948 | 498 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
499 | return 0; |
500 | } | |
501 | if (card->id[0] == '\0') | |
502 | choose_default_id(card); | |
503 | snd_cards[card->number] = card; | |
746df948 | 504 | mutex_unlock(&snd_card_mutex); |
e28563cc | 505 | init_info_for_card(card); |
1da177e4 LT |
506 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
507 | if (snd_mixer_oss_notify_callback) | |
508 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
509 | #endif | |
510 | return 0; | |
511 | } | |
512 | ||
c0d3fb39 TI |
513 | EXPORT_SYMBOL(snd_card_register); |
514 | ||
e28563cc | 515 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 516 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 517 | |
a381a7a6 TI |
518 | static void snd_card_info_read(struct snd_info_entry *entry, |
519 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
520 | { |
521 | int idx, count; | |
512bbd6a | 522 | struct snd_card *card; |
1da177e4 LT |
523 | |
524 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 525 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
526 | if ((card = snd_cards[idx]) != NULL) { |
527 | count++; | |
d001544d | 528 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
529 | idx, |
530 | card->id, | |
531 | card->driver, | |
532 | card->shortname); | |
d001544d | 533 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
534 | card->longname); |
535 | } | |
746df948 | 536 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
537 | } |
538 | if (!count) | |
539 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
540 | } | |
541 | ||
e28563cc | 542 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 543 | |
512bbd6a | 544 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
545 | { |
546 | int idx, count; | |
512bbd6a | 547 | struct snd_card *card; |
1da177e4 LT |
548 | |
549 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 550 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
551 | if ((card = snd_cards[idx]) != NULL) { |
552 | count++; | |
553 | snd_iprintf(buffer, "%s\n", card->longname); | |
554 | } | |
746df948 | 555 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
556 | } |
557 | if (!count) { | |
558 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
559 | } | |
560 | } | |
561 | ||
562 | #endif | |
563 | ||
564 | #ifdef MODULE | |
512bbd6a TI |
565 | static struct snd_info_entry *snd_card_module_info_entry; |
566 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
567 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
568 | { |
569 | int idx; | |
512bbd6a | 570 | struct snd_card *card; |
1da177e4 LT |
571 | |
572 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 573 | mutex_lock(&snd_card_mutex); |
1da177e4 | 574 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
575 | snd_iprintf(buffer, "%2i %s\n", |
576 | idx, card->module->name); | |
746df948 | 577 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
578 | } |
579 | } | |
580 | #endif | |
581 | ||
582 | int __init snd_card_info_init(void) | |
583 | { | |
512bbd6a | 584 | struct snd_info_entry *entry; |
1da177e4 LT |
585 | |
586 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
587 | if (! entry) |
588 | return -ENOMEM; | |
1da177e4 LT |
589 | entry->c.text.read = snd_card_info_read; |
590 | if (snd_info_register(entry) < 0) { | |
591 | snd_info_free_entry(entry); | |
592 | return -ENOMEM; | |
593 | } | |
594 | snd_card_info_entry = entry; | |
595 | ||
596 | #ifdef MODULE | |
597 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
598 | if (entry) { | |
1da177e4 LT |
599 | entry->c.text.read = snd_card_module_info_read; |
600 | if (snd_info_register(entry) < 0) | |
601 | snd_info_free_entry(entry); | |
602 | else | |
603 | snd_card_module_info_entry = entry; | |
604 | } | |
605 | #endif | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | int __exit snd_card_info_done(void) | |
611 | { | |
746d4a02 | 612 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 613 | #ifdef MODULE |
746d4a02 | 614 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
615 | #endif |
616 | return 0; | |
617 | } | |
618 | ||
e28563cc TI |
619 | #endif /* CONFIG_PROC_FS */ |
620 | ||
1da177e4 LT |
621 | /** |
622 | * snd_component_add - add a component string | |
623 | * @card: soundcard structure | |
624 | * @component: the component id string | |
625 | * | |
626 | * This function adds the component id string to the supported list. | |
627 | * The component can be referred from the alsa-lib. | |
628 | * | |
629 | * Returns zero otherwise a negative error code. | |
630 | */ | |
631 | ||
512bbd6a | 632 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
633 | { |
634 | char *ptr; | |
635 | int len = strlen(component); | |
636 | ||
637 | ptr = strstr(card->components, component); | |
638 | if (ptr != NULL) { | |
639 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
640 | return 1; | |
641 | } | |
642 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
643 | snd_BUG(); | |
644 | return -ENOMEM; | |
645 | } | |
646 | if (card->components[0] != '\0') | |
647 | strcat(card->components, " "); | |
648 | strcat(card->components, component); | |
649 | return 0; | |
650 | } | |
651 | ||
c0d3fb39 TI |
652 | EXPORT_SYMBOL(snd_component_add); |
653 | ||
1da177e4 LT |
654 | /** |
655 | * snd_card_file_add - add the file to the file list of the card | |
656 | * @card: soundcard structure | |
657 | * @file: file pointer | |
658 | * | |
659 | * This function adds the file to the file linked-list of the card. | |
660 | * This linked-list is used to keep tracking the connection state, | |
661 | * and to avoid the release of busy resources by hotplug. | |
662 | * | |
663 | * Returns zero or a negative error code. | |
664 | */ | |
512bbd6a | 665 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
666 | { |
667 | struct snd_monitor_file *mfile; | |
668 | ||
669 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
670 | if (mfile == NULL) | |
671 | return -ENOMEM; | |
672 | mfile->file = file; | |
673 | mfile->next = NULL; | |
674 | spin_lock(&card->files_lock); | |
675 | if (card->shutdown) { | |
676 | spin_unlock(&card->files_lock); | |
677 | kfree(mfile); | |
678 | return -ENODEV; | |
679 | } | |
680 | mfile->next = card->files; | |
681 | card->files = mfile; | |
682 | spin_unlock(&card->files_lock); | |
683 | return 0; | |
684 | } | |
685 | ||
c0d3fb39 TI |
686 | EXPORT_SYMBOL(snd_card_file_add); |
687 | ||
1da177e4 LT |
688 | /** |
689 | * snd_card_file_remove - remove the file from the file list | |
690 | * @card: soundcard structure | |
691 | * @file: file pointer | |
692 | * | |
693 | * This function removes the file formerly added to the card via | |
694 | * snd_card_file_add() function. | |
2b29b13c TI |
695 | * If all files are removed and snd_card_free_when_closed() was |
696 | * called beforehand, it processes the pending release of | |
697 | * resources. | |
1da177e4 LT |
698 | * |
699 | * Returns zero or a negative error code. | |
700 | */ | |
512bbd6a | 701 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
702 | { |
703 | struct snd_monitor_file *mfile, *pfile = NULL; | |
c461482c | 704 | int last_close = 0; |
1da177e4 LT |
705 | |
706 | spin_lock(&card->files_lock); | |
707 | mfile = card->files; | |
708 | while (mfile) { | |
709 | if (mfile->file == file) { | |
710 | if (pfile) | |
711 | pfile->next = mfile->next; | |
712 | else | |
713 | card->files = mfile->next; | |
714 | break; | |
715 | } | |
716 | pfile = mfile; | |
717 | mfile = mfile->next; | |
718 | } | |
1da177e4 | 719 | if (card->files == NULL) |
c461482c TI |
720 | last_close = 1; |
721 | spin_unlock(&card->files_lock); | |
722 | if (last_close) { | |
1da177e4 | 723 | wake_up(&card->shutdown_sleep); |
c461482c TI |
724 | if (card->free_on_last_close) |
725 | snd_card_do_free(card); | |
726 | } | |
1da177e4 LT |
727 | if (!mfile) { |
728 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
729 | return -ENOENT; | |
730 | } | |
731 | kfree(mfile); | |
732 | return 0; | |
733 | } | |
734 | ||
c0d3fb39 TI |
735 | EXPORT_SYMBOL(snd_card_file_remove); |
736 | ||
1da177e4 LT |
737 | #ifdef CONFIG_PM |
738 | /** | |
739 | * snd_power_wait - wait until the power-state is changed. | |
740 | * @card: soundcard structure | |
741 | * @power_state: expected power state | |
1da177e4 LT |
742 | * |
743 | * Waits until the power-state is changed. | |
744 | * | |
745 | * Note: the power lock must be active before call. | |
746 | */ | |
cbac4b0c | 747 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
748 | { |
749 | wait_queue_t wait; | |
750 | int result = 0; | |
751 | ||
752 | /* fastpath */ | |
753 | if (snd_power_get_state(card) == power_state) | |
754 | return 0; | |
755 | init_waitqueue_entry(&wait, current); | |
756 | add_wait_queue(&card->power_sleep, &wait); | |
757 | while (1) { | |
758 | if (card->shutdown) { | |
759 | result = -ENODEV; | |
760 | break; | |
761 | } | |
762 | if (snd_power_get_state(card) == power_state) | |
763 | break; | |
1da177e4 LT |
764 | set_current_state(TASK_UNINTERRUPTIBLE); |
765 | snd_power_unlock(card); | |
766 | schedule_timeout(30 * HZ); | |
767 | snd_power_lock(card); | |
768 | } | |
769 | remove_wait_queue(&card->power_sleep, &wait); | |
770 | return result; | |
771 | } | |
772 | ||
c0d3fb39 | 773 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 774 | #endif /* CONFIG_PM */ |