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> | |
1da177e4 | 29 | #include <linux/pm.h> |
d052d1be | 30 | |
1da177e4 LT |
31 | #include <sound/core.h> |
32 | #include <sound/control.h> | |
33 | #include <sound/info.h> | |
34 | ||
a9edfc60 KW |
35 | static DEFINE_SPINLOCK(shutdown_lock); |
36 | static LIST_HEAD(shutdown_files); | |
37 | ||
9c2e08c5 | 38 | static const struct file_operations snd_shutdown_f_ops; |
1da177e4 | 39 | |
6581f4e7 TI |
40 | static unsigned int snd_cards_lock; /* locked for registering/using */ |
41 | struct snd_card *snd_cards[SNDRV_CARDS]; | |
c0d3fb39 TI |
42 | EXPORT_SYMBOL(snd_cards); |
43 | ||
746df948 | 44 | static DEFINE_MUTEX(snd_card_mutex); |
1da177e4 LT |
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); |
c0d3fb39 | 48 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
49 | #endif |
50 | ||
e28563cc | 51 | #ifdef CONFIG_PROC_FS |
512bbd6a TI |
52 | static void snd_card_id_read(struct snd_info_entry *entry, |
53 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
54 | { |
55 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
56 | } | |
57 | ||
e28563cc TI |
58 | static inline int init_info_for_card(struct snd_card *card) |
59 | { | |
60 | int err; | |
61 | struct snd_info_entry *entry; | |
62 | ||
63 | if ((err = snd_info_card_register(card)) < 0) { | |
64 | snd_printd("unable to create card info\n"); | |
65 | return err; | |
66 | } | |
67 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
68 | snd_printd("unable to create card entry\n"); | |
69 | return err; | |
70 | } | |
e28563cc TI |
71 | entry->c.text.read = snd_card_id_read; |
72 | if (snd_info_register(entry) < 0) { | |
73 | snd_info_free_entry(entry); | |
74 | entry = NULL; | |
75 | } | |
76 | card->proc_id = entry; | |
77 | return 0; | |
78 | } | |
79 | #else /* !CONFIG_PROC_FS */ | |
80 | #define init_info_for_card(card) | |
81 | #endif | |
82 | ||
1da177e4 LT |
83 | /** |
84 | * snd_card_new - create and initialize a soundcard structure | |
85 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
86 | * @xid: card identification (ASCII string) | |
87 | * @module: top level module for locking | |
88 | * @extra_size: allocate this extra size after the main soundcard structure | |
89 | * | |
90 | * Creates and initializes a soundcard structure. | |
91 | * | |
512bbd6a | 92 | * Returns kmallocated snd_card structure. Creates the ALSA control interface |
1da177e4 LT |
93 | * (which is blocked until snd_card_register function is called). |
94 | */ | |
512bbd6a | 95 | struct snd_card *snd_card_new(int idx, const char *xid, |
1da177e4 LT |
96 | struct module *module, int extra_size) |
97 | { | |
512bbd6a | 98 | struct snd_card *card; |
1da177e4 LT |
99 | int err; |
100 | ||
101 | if (extra_size < 0) | |
102 | extra_size = 0; | |
ca2c0966 | 103 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
1da177e4 LT |
104 | if (card == NULL) |
105 | return NULL; | |
106 | if (xid) { | |
107 | if (!snd_info_check_reserved_words(xid)) | |
108 | goto __error; | |
109 | strlcpy(card->id, xid, sizeof(card->id)); | |
110 | } | |
111 | err = 0; | |
746df948 | 112 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
113 | if (idx < 0) { |
114 | int idx2; | |
115 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
5c33dd70 | 116 | /* idx == -1 == 0xffff means: take any free slot */ |
1da177e4 LT |
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 | } | |
5c33dd70 ON |
123 | } else { |
124 | if (idx < snd_ecards_limit) { | |
125 | if (snd_cards_lock & (1 << idx)) | |
126 | err = -EBUSY; /* invalid */ | |
127 | } else { | |
128 | if (idx < SNDRV_CARDS) | |
129 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
130 | else | |
131 | err = -ENODEV; | |
132 | } | |
133 | } | |
1da177e4 | 134 | if (idx < 0 || err < 0) { |
746df948 | 135 | mutex_unlock(&snd_card_mutex); |
5c33dd70 ON |
136 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
137 | idx, snd_ecards_limit - 1, err); | |
1da177e4 LT |
138 | goto __error; |
139 | } | |
140 | snd_cards_lock |= 1 << idx; /* lock it */ | |
746df948 | 141 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
142 | card->number = idx; |
143 | card->module = module; | |
144 | INIT_LIST_HEAD(&card->devices); | |
145 | init_rwsem(&card->controls_rwsem); | |
146 | rwlock_init(&card->ctl_files_rwlock); | |
147 | INIT_LIST_HEAD(&card->controls); | |
148 | INIT_LIST_HEAD(&card->ctl_files); | |
149 | spin_lock_init(&card->files_lock); | |
150 | init_waitqueue_head(&card->shutdown_sleep); | |
1da177e4 | 151 | #ifdef CONFIG_PM |
1a60d4c5 | 152 | mutex_init(&card->power_lock); |
1da177e4 LT |
153 | init_waitqueue_head(&card->power_sleep); |
154 | #endif | |
155 | /* the control interface cannot be accessed from the user space until */ | |
156 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
157 | if ((err = snd_ctl_create(card)) < 0) { | |
158 | snd_printd("unable to register control minors\n"); | |
159 | goto __error; | |
160 | } | |
161 | if ((err = snd_info_card_create(card)) < 0) { | |
162 | snd_printd("unable to create card info\n"); | |
163 | goto __error_ctl; | |
164 | } | |
165 | if (extra_size > 0) | |
512bbd6a | 166 | card->private_data = (char *)card + sizeof(struct snd_card); |
1da177e4 LT |
167 | return card; |
168 | ||
169 | __error_ctl: | |
170 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
171 | __error: | |
172 | kfree(card); | |
173 | return NULL; | |
174 | } | |
175 | ||
c0d3fb39 TI |
176 | EXPORT_SYMBOL(snd_card_new); |
177 | ||
746df948 TI |
178 | /* return non-zero if a card is already locked */ |
179 | int snd_card_locked(int card) | |
180 | { | |
181 | int locked; | |
182 | ||
183 | mutex_lock(&snd_card_mutex); | |
184 | locked = snd_cards_lock & (1 << card); | |
185 | mutex_unlock(&snd_card_mutex); | |
186 | return locked; | |
187 | } | |
188 | ||
b3b0abe1 CL |
189 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
190 | { | |
191 | return -ENODEV; | |
192 | } | |
193 | ||
194 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
195 | size_t count, loff_t *offset) | |
196 | { | |
197 | return -ENODEV; | |
198 | } | |
199 | ||
200 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
201 | size_t count, loff_t *offset) | |
202 | { | |
203 | return -ENODEV; | |
204 | } | |
205 | ||
a9edfc60 KW |
206 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
207 | { | |
208 | struct snd_monitor_file *df = NULL, *_df; | |
209 | ||
210 | spin_lock(&shutdown_lock); | |
211 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
212 | if (_df->file == file) { | |
213 | df = _df; | |
214 | break; | |
215 | } | |
216 | } | |
217 | spin_unlock(&shutdown_lock); | |
218 | ||
219 | if (likely(df)) | |
220 | return df->disconnected_f_op->release(inode, file); | |
221 | ||
222 | panic("%s(%p, %p) failed!", __FUNCTION__, inode, file); | |
223 | } | |
224 | ||
1da177e4 LT |
225 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
226 | { | |
227 | return POLLERR | POLLNVAL; | |
228 | } | |
229 | ||
b3b0abe1 CL |
230 | static long snd_disconnect_ioctl(struct file *file, |
231 | unsigned int cmd, unsigned long arg) | |
232 | { | |
233 | return -ENODEV; | |
234 | } | |
235 | ||
236 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
237 | { | |
238 | return -ENODEV; | |
239 | } | |
240 | ||
241 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
242 | { | |
243 | return -ENODEV; | |
244 | } | |
245 | ||
9c2e08c5 | 246 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
247 | { |
248 | .owner = THIS_MODULE, | |
249 | .llseek = snd_disconnect_llseek, | |
250 | .read = snd_disconnect_read, | |
251 | .write = snd_disconnect_write, | |
252 | .release = snd_disconnect_release, | |
253 | .poll = snd_disconnect_poll, | |
254 | .unlocked_ioctl = snd_disconnect_ioctl, | |
255 | #ifdef CONFIG_COMPAT | |
256 | .compat_ioctl = snd_disconnect_ioctl, | |
257 | #endif | |
258 | .mmap = snd_disconnect_mmap, | |
259 | .fasync = snd_disconnect_fasync | |
260 | }; | |
261 | ||
1da177e4 LT |
262 | /** |
263 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
264 | * @card: soundcard structure | |
265 | * | |
266 | * Disconnects all APIs from the file-operations (user space). | |
267 | * | |
268 | * Returns zero, otherwise a negative error code. | |
269 | * | |
270 | * Note: The current implementation replaces all active file->f_op with special | |
271 | * dummy file operations (they do nothing except release). | |
272 | */ | |
512bbd6a | 273 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
274 | { |
275 | struct snd_monitor_file *mfile; | |
276 | struct file *file; | |
1da177e4 LT |
277 | int err; |
278 | ||
279 | spin_lock(&card->files_lock); | |
280 | if (card->shutdown) { | |
281 | spin_unlock(&card->files_lock); | |
282 | return 0; | |
283 | } | |
284 | card->shutdown = 1; | |
285 | spin_unlock(&card->files_lock); | |
286 | ||
287 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 288 | mutex_lock(&snd_card_mutex); |
1da177e4 | 289 | snd_cards[card->number] = NULL; |
746df948 | 290 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
291 | |
292 | /* phase 2: replace file->f_op with special dummy operations */ | |
293 | ||
294 | spin_lock(&card->files_lock); | |
295 | mfile = card->files; | |
296 | while (mfile) { | |
297 | file = mfile->file; | |
298 | ||
299 | /* it's critical part, use endless loop */ | |
300 | /* we have no room to fail */ | |
a9edfc60 | 301 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 302 | |
a9edfc60 KW |
303 | spin_lock(&shutdown_lock); |
304 | list_add(&mfile->shutdown_list, &shutdown_files); | |
305 | spin_unlock(&shutdown_lock); | |
1da177e4 | 306 | |
a9edfc60 KW |
307 | fops_get(&snd_shutdown_f_ops); |
308 | mfile->file->f_op = &snd_shutdown_f_ops; | |
1da177e4 LT |
309 | |
310 | mfile = mfile->next; | |
311 | } | |
312 | spin_unlock(&card->files_lock); | |
313 | ||
314 | /* phase 3: notify all connected devices about disconnection */ | |
315 | /* at this point, they cannot respond to any calls except release() */ | |
316 | ||
317 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
318 | if (snd_mixer_oss_notify_callback) | |
319 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
320 | #endif | |
321 | ||
322 | /* notify all devices that we are disconnected */ | |
323 | err = snd_device_disconnect_all(card); | |
324 | if (err < 0) | |
325 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
326 | ||
746d4a02 | 327 | snd_info_card_disconnect(card); |
1da177e4 LT |
328 | return 0; |
329 | } | |
330 | ||
c0d3fb39 TI |
331 | EXPORT_SYMBOL(snd_card_disconnect); |
332 | ||
1da177e4 LT |
333 | /** |
334 | * snd_card_free - frees given soundcard structure | |
335 | * @card: soundcard structure | |
336 | * | |
337 | * This function releases the soundcard structure and the all assigned | |
338 | * devices automatically. That is, you don't have to release the devices | |
339 | * by yourself. | |
340 | * | |
341 | * Returns zero. Frees all associated devices and frees the control | |
342 | * interface associated to given soundcard. | |
343 | */ | |
c461482c | 344 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 345 | { |
1da177e4 LT |
346 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
347 | if (snd_mixer_oss_notify_callback) | |
348 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
349 | #endif | |
350 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
351 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
352 | /* Fatal, but this situation should never occur */ | |
353 | } | |
354 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
355 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
356 | /* Fatal, but this situation should never occur */ | |
357 | } | |
358 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
359 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
360 | /* Fatal, but this situation should never occur */ | |
361 | } | |
362 | if (card->private_free) | |
363 | card->private_free(card); | |
746d4a02 | 364 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
365 | if (snd_info_card_free(card) < 0) { |
366 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
367 | /* Not fatal error */ | |
368 | } | |
7d2aae1e TI |
369 | #ifndef CONFIG_SYSFS_DEPRECATED |
370 | if (card->card_dev) | |
371 | device_unregister(card->card_dev); | |
372 | #endif | |
c461482c TI |
373 | kfree(card); |
374 | return 0; | |
375 | } | |
376 | ||
377 | static int snd_card_free_prepare(struct snd_card *card) | |
378 | { | |
379 | if (card == NULL) | |
380 | return -EINVAL; | |
381 | (void) snd_card_disconnect(card); | |
746df948 | 382 | mutex_lock(&snd_card_mutex); |
c461482c | 383 | snd_cards[card->number] = NULL; |
1da177e4 | 384 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 385 | mutex_unlock(&snd_card_mutex); |
c461482c TI |
386 | #ifdef CONFIG_PM |
387 | wake_up(&card->power_sleep); | |
388 | #endif | |
389 | return 0; | |
390 | } | |
391 | ||
392 | int snd_card_free_when_closed(struct snd_card *card) | |
393 | { | |
394 | int free_now = 0; | |
395 | int ret = snd_card_free_prepare(card); | |
396 | if (ret) | |
397 | return ret; | |
398 | ||
399 | spin_lock(&card->files_lock); | |
400 | if (card->files == NULL) | |
401 | free_now = 1; | |
402 | else | |
403 | card->free_on_last_close = 1; | |
404 | spin_unlock(&card->files_lock); | |
405 | ||
406 | if (free_now) | |
407 | snd_card_do_free(card); | |
408 | return 0; | |
409 | } | |
410 | ||
411 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
412 | ||
413 | int snd_card_free(struct snd_card *card) | |
414 | { | |
415 | int ret = snd_card_free_prepare(card); | |
416 | if (ret) | |
417 | return ret; | |
418 | ||
419 | /* wait, until all devices are ready for the free operation */ | |
420 | wait_event(card->shutdown_sleep, card->files == NULL); | |
421 | snd_card_do_free(card); | |
1da177e4 LT |
422 | return 0; |
423 | } | |
424 | ||
c0d3fb39 TI |
425 | EXPORT_SYMBOL(snd_card_free); |
426 | ||
512bbd6a | 427 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 428 | { |
d001544d | 429 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
430 | char *id, *spos; |
431 | ||
432 | id = spos = card->shortname; | |
433 | while (*id != '\0') { | |
434 | if (*id == ' ') | |
435 | spos = id + 1; | |
436 | id++; | |
437 | } | |
438 | id = card->id; | |
439 | while (*spos != '\0' && !isalnum(*spos)) | |
440 | spos++; | |
441 | if (isdigit(*spos)) | |
442 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
443 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
444 | if (isalnum(*spos)) | |
445 | *id++ = *spos; | |
446 | spos++; | |
447 | } | |
448 | *id = '\0'; | |
449 | ||
450 | id = card->id; | |
451 | ||
452 | if (*id == '\0') | |
453 | strcpy(id, "default"); | |
454 | ||
455 | while (1) { | |
456 | if (loops-- == 0) { | |
457 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
458 | strcpy(card->id, card->proc_root->name); | |
459 | return; | |
460 | } | |
461 | if (!snd_info_check_reserved_words(id)) | |
462 | goto __change; | |
463 | for (i = 0; i < snd_ecards_limit; i++) { | |
464 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
465 | goto __change; | |
466 | } | |
467 | break; | |
468 | ||
469 | __change: | |
470 | len = strlen(id); | |
d001544d CL |
471 | if (idx_flag) { |
472 | if (id[len-1] != '9') | |
473 | id[len-1]++; | |
474 | else | |
475 | id[len-1] = 'A'; | |
476 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
477 | strcat(id, "_1"); |
478 | idx_flag++; | |
479 | } else { | |
480 | spos = id + len - 2; | |
481 | if ((size_t)len <= sizeof(card->id) - 2) | |
482 | spos++; | |
483 | *spos++ = '_'; | |
484 | *spos++ = '1'; | |
485 | *spos++ = '\0'; | |
486 | idx_flag++; | |
487 | } | |
488 | } | |
489 | } | |
490 | ||
491 | /** | |
492 | * snd_card_register - register the soundcard | |
493 | * @card: soundcard structure | |
494 | * | |
495 | * This function registers all the devices assigned to the soundcard. | |
496 | * Until calling this, the ALSA control interface is blocked from the | |
497 | * external accesses. Thus, you should call this function at the end | |
498 | * of the initialization of the card. | |
499 | * | |
500 | * Returns zero otherwise a negative error code if the registrain failed. | |
501 | */ | |
512bbd6a | 502 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
503 | { |
504 | int err; | |
1da177e4 | 505 | |
7c22f1aa | 506 | snd_assert(card != NULL, return -EINVAL); |
7d2aae1e TI |
507 | #ifndef CONFIG_SYSFS_DEPRECATED |
508 | if (!card->card_dev) { | |
509 | card->card_dev = device_create(sound_class, card->dev, 0, | |
510 | "card%i", card->number); | |
511 | if (IS_ERR(card->card_dev)) | |
512 | card->card_dev = NULL; | |
d80f19fa | 513 | } |
7d2aae1e | 514 | #endif |
1da177e4 LT |
515 | if ((err = snd_device_register_all(card)) < 0) |
516 | return err; | |
746df948 | 517 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
518 | if (snd_cards[card->number]) { |
519 | /* already registered */ | |
746df948 | 520 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
521 | return 0; |
522 | } | |
523 | if (card->id[0] == '\0') | |
524 | choose_default_id(card); | |
525 | snd_cards[card->number] = card; | |
746df948 | 526 | mutex_unlock(&snd_card_mutex); |
e28563cc | 527 | init_info_for_card(card); |
1da177e4 LT |
528 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
529 | if (snd_mixer_oss_notify_callback) | |
530 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
531 | #endif | |
532 | return 0; | |
533 | } | |
534 | ||
c0d3fb39 TI |
535 | EXPORT_SYMBOL(snd_card_register); |
536 | ||
e28563cc | 537 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 538 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 539 | |
a381a7a6 TI |
540 | static void snd_card_info_read(struct snd_info_entry *entry, |
541 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
542 | { |
543 | int idx, count; | |
512bbd6a | 544 | struct snd_card *card; |
1da177e4 LT |
545 | |
546 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 547 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
548 | if ((card = snd_cards[idx]) != NULL) { |
549 | count++; | |
d001544d | 550 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
551 | idx, |
552 | card->id, | |
553 | card->driver, | |
554 | card->shortname); | |
d001544d | 555 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
556 | card->longname); |
557 | } | |
746df948 | 558 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
559 | } |
560 | if (!count) | |
561 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
562 | } | |
563 | ||
e28563cc | 564 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 565 | |
512bbd6a | 566 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
567 | { |
568 | int idx, count; | |
512bbd6a | 569 | struct snd_card *card; |
1da177e4 LT |
570 | |
571 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 572 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
573 | if ((card = snd_cards[idx]) != NULL) { |
574 | count++; | |
575 | snd_iprintf(buffer, "%s\n", card->longname); | |
576 | } | |
746df948 | 577 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
578 | } |
579 | if (!count) { | |
580 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
581 | } | |
582 | } | |
583 | ||
584 | #endif | |
585 | ||
586 | #ifdef MODULE | |
512bbd6a TI |
587 | static struct snd_info_entry *snd_card_module_info_entry; |
588 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
589 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
590 | { |
591 | int idx; | |
512bbd6a | 592 | struct snd_card *card; |
1da177e4 LT |
593 | |
594 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 595 | mutex_lock(&snd_card_mutex); |
1da177e4 | 596 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
597 | snd_iprintf(buffer, "%2i %s\n", |
598 | idx, card->module->name); | |
746df948 | 599 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
600 | } |
601 | } | |
602 | #endif | |
603 | ||
604 | int __init snd_card_info_init(void) | |
605 | { | |
512bbd6a | 606 | struct snd_info_entry *entry; |
1da177e4 LT |
607 | |
608 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
609 | if (! entry) |
610 | return -ENOMEM; | |
1da177e4 LT |
611 | entry->c.text.read = snd_card_info_read; |
612 | if (snd_info_register(entry) < 0) { | |
613 | snd_info_free_entry(entry); | |
614 | return -ENOMEM; | |
615 | } | |
616 | snd_card_info_entry = entry; | |
617 | ||
618 | #ifdef MODULE | |
619 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
620 | if (entry) { | |
1da177e4 LT |
621 | entry->c.text.read = snd_card_module_info_read; |
622 | if (snd_info_register(entry) < 0) | |
623 | snd_info_free_entry(entry); | |
624 | else | |
625 | snd_card_module_info_entry = entry; | |
626 | } | |
627 | #endif | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
632 | int __exit snd_card_info_done(void) | |
633 | { | |
746d4a02 | 634 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 635 | #ifdef MODULE |
746d4a02 | 636 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
637 | #endif |
638 | return 0; | |
639 | } | |
640 | ||
e28563cc TI |
641 | #endif /* CONFIG_PROC_FS */ |
642 | ||
1da177e4 LT |
643 | /** |
644 | * snd_component_add - add a component string | |
645 | * @card: soundcard structure | |
646 | * @component: the component id string | |
647 | * | |
648 | * This function adds the component id string to the supported list. | |
649 | * The component can be referred from the alsa-lib. | |
650 | * | |
651 | * Returns zero otherwise a negative error code. | |
652 | */ | |
653 | ||
512bbd6a | 654 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
655 | { |
656 | char *ptr; | |
657 | int len = strlen(component); | |
658 | ||
659 | ptr = strstr(card->components, component); | |
660 | if (ptr != NULL) { | |
661 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
662 | return 1; | |
663 | } | |
664 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
665 | snd_BUG(); | |
666 | return -ENOMEM; | |
667 | } | |
668 | if (card->components[0] != '\0') | |
669 | strcat(card->components, " "); | |
670 | strcat(card->components, component); | |
671 | return 0; | |
672 | } | |
673 | ||
c0d3fb39 TI |
674 | EXPORT_SYMBOL(snd_component_add); |
675 | ||
1da177e4 LT |
676 | /** |
677 | * snd_card_file_add - add the file to the file list of the card | |
678 | * @card: soundcard structure | |
679 | * @file: file pointer | |
680 | * | |
681 | * This function adds the file to the file linked-list of the card. | |
682 | * This linked-list is used to keep tracking the connection state, | |
683 | * and to avoid the release of busy resources by hotplug. | |
684 | * | |
685 | * Returns zero or a negative error code. | |
686 | */ | |
512bbd6a | 687 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
688 | { |
689 | struct snd_monitor_file *mfile; | |
690 | ||
691 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
692 | if (mfile == NULL) | |
693 | return -ENOMEM; | |
694 | mfile->file = file; | |
a9edfc60 | 695 | mfile->disconnected_f_op = NULL; |
1da177e4 LT |
696 | mfile->next = NULL; |
697 | spin_lock(&card->files_lock); | |
698 | if (card->shutdown) { | |
699 | spin_unlock(&card->files_lock); | |
700 | kfree(mfile); | |
701 | return -ENODEV; | |
702 | } | |
703 | mfile->next = card->files; | |
704 | card->files = mfile; | |
705 | spin_unlock(&card->files_lock); | |
706 | return 0; | |
707 | } | |
708 | ||
c0d3fb39 TI |
709 | EXPORT_SYMBOL(snd_card_file_add); |
710 | ||
1da177e4 LT |
711 | /** |
712 | * snd_card_file_remove - remove the file from the file list | |
713 | * @card: soundcard structure | |
714 | * @file: file pointer | |
715 | * | |
716 | * This function removes the file formerly added to the card via | |
717 | * snd_card_file_add() function. | |
2b29b13c TI |
718 | * If all files are removed and snd_card_free_when_closed() was |
719 | * called beforehand, it processes the pending release of | |
720 | * resources. | |
1da177e4 LT |
721 | * |
722 | * Returns zero or a negative error code. | |
723 | */ | |
512bbd6a | 724 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
725 | { |
726 | struct snd_monitor_file *mfile, *pfile = NULL; | |
c461482c | 727 | int last_close = 0; |
1da177e4 LT |
728 | |
729 | spin_lock(&card->files_lock); | |
730 | mfile = card->files; | |
731 | while (mfile) { | |
732 | if (mfile->file == file) { | |
733 | if (pfile) | |
734 | pfile->next = mfile->next; | |
735 | else | |
736 | card->files = mfile->next; | |
737 | break; | |
738 | } | |
739 | pfile = mfile; | |
740 | mfile = mfile->next; | |
741 | } | |
a9edfc60 KW |
742 | if (mfile && mfile->disconnected_f_op) { |
743 | fops_put(mfile->disconnected_f_op); | |
744 | spin_lock(&shutdown_lock); | |
745 | list_del(&mfile->shutdown_list); | |
746 | spin_unlock(&shutdown_lock); | |
747 | } | |
1da177e4 | 748 | if (card->files == NULL) |
c461482c TI |
749 | last_close = 1; |
750 | spin_unlock(&card->files_lock); | |
751 | if (last_close) { | |
1da177e4 | 752 | wake_up(&card->shutdown_sleep); |
c461482c TI |
753 | if (card->free_on_last_close) |
754 | snd_card_do_free(card); | |
755 | } | |
1da177e4 LT |
756 | if (!mfile) { |
757 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
758 | return -ENOENT; | |
759 | } | |
760 | kfree(mfile); | |
761 | return 0; | |
762 | } | |
763 | ||
c0d3fb39 TI |
764 | EXPORT_SYMBOL(snd_card_file_remove); |
765 | ||
1da177e4 LT |
766 | #ifdef CONFIG_PM |
767 | /** | |
768 | * snd_power_wait - wait until the power-state is changed. | |
769 | * @card: soundcard structure | |
770 | * @power_state: expected power state | |
1da177e4 LT |
771 | * |
772 | * Waits until the power-state is changed. | |
773 | * | |
774 | * Note: the power lock must be active before call. | |
775 | */ | |
cbac4b0c | 776 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
777 | { |
778 | wait_queue_t wait; | |
779 | int result = 0; | |
780 | ||
781 | /* fastpath */ | |
782 | if (snd_power_get_state(card) == power_state) | |
783 | return 0; | |
784 | init_waitqueue_entry(&wait, current); | |
785 | add_wait_queue(&card->power_sleep, &wait); | |
786 | while (1) { | |
787 | if (card->shutdown) { | |
788 | result = -ENODEV; | |
789 | break; | |
790 | } | |
791 | if (snd_power_get_state(card) == power_state) | |
792 | break; | |
1da177e4 LT |
793 | set_current_state(TASK_UNINTERRUPTIBLE); |
794 | snd_power_unlock(card); | |
795 | schedule_timeout(30 * HZ); | |
796 | snd_power_lock(card); | |
797 | } | |
798 | remove_wait_queue(&card->power_sleep, &wait); | |
799 | return result; | |
800 | } | |
801 | ||
c0d3fb39 | 802 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 803 | #endif /* CONFIG_PM */ |