Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Initialization routines | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 LT |
22 | #include <linux/init.h> |
23 | #include <linux/sched.h> | |
24 | #include <linux/file.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/ctype.h> | |
1da177e4 | 28 | #include <linux/pm.h> |
d052d1be | 29 | |
1da177e4 LT |
30 | #include <sound/core.h> |
31 | #include <sound/control.h> | |
32 | #include <sound/info.h> | |
33 | ||
a9edfc60 KW |
34 | static DEFINE_SPINLOCK(shutdown_lock); |
35 | static LIST_HEAD(shutdown_files); | |
36 | ||
9c2e08c5 | 37 | static const struct file_operations snd_shutdown_f_ops; |
1da177e4 | 38 | |
6581f4e7 TI |
39 | static unsigned int snd_cards_lock; /* locked for registering/using */ |
40 | struct snd_card *snd_cards[SNDRV_CARDS]; | |
c0d3fb39 TI |
41 | EXPORT_SYMBOL(snd_cards); |
42 | ||
746df948 | 43 | static DEFINE_MUTEX(snd_card_mutex); |
1da177e4 | 44 | |
304cd07f TI |
45 | static char *slots[SNDRV_CARDS]; |
46 | module_param_array(slots, charp, NULL, 0444); | |
47 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); | |
48 | ||
49 | /* return non-zero if the given index is already reserved for another | |
50 | * module via slots option | |
51 | */ | |
52 | static int module_slot_mismatch(struct module *module, int idx) | |
53 | { | |
54 | #ifdef MODULE | |
55 | char *s1, *s2; | |
56 | if (!module || !module->name || !slots[idx]) | |
57 | return 0; | |
58 | s1 = slots[idx]; | |
59 | s2 = module->name; | |
60 | /* compare module name strings | |
61 | * hyphens are handled as equivalent with underscore | |
62 | */ | |
63 | for (;;) { | |
64 | char c1 = *s1++; | |
65 | char c2 = *s2++; | |
66 | if (c1 == '-') | |
67 | c1 = '_'; | |
68 | if (c2 == '-') | |
69 | c2 = '_'; | |
70 | if (c1 != c2) | |
71 | return 1; | |
72 | if (!c1) | |
73 | break; | |
74 | } | |
75 | #endif | |
76 | return 0; | |
77 | } | |
78 | ||
1da177e4 | 79 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
512bbd6a | 80 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
c0d3fb39 | 81 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
82 | #endif |
83 | ||
e28563cc | 84 | #ifdef CONFIG_PROC_FS |
512bbd6a TI |
85 | static void snd_card_id_read(struct snd_info_entry *entry, |
86 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
87 | { |
88 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
89 | } | |
90 | ||
e28563cc TI |
91 | static inline int init_info_for_card(struct snd_card *card) |
92 | { | |
93 | int err; | |
94 | struct snd_info_entry *entry; | |
95 | ||
96 | if ((err = snd_info_card_register(card)) < 0) { | |
97 | snd_printd("unable to create card info\n"); | |
98 | return err; | |
99 | } | |
100 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
101 | snd_printd("unable to create card entry\n"); | |
102 | return err; | |
103 | } | |
e28563cc TI |
104 | entry->c.text.read = snd_card_id_read; |
105 | if (snd_info_register(entry) < 0) { | |
106 | snd_info_free_entry(entry); | |
107 | entry = NULL; | |
108 | } | |
109 | card->proc_id = entry; | |
110 | return 0; | |
111 | } | |
112 | #else /* !CONFIG_PROC_FS */ | |
113 | #define init_info_for_card(card) | |
114 | #endif | |
115 | ||
1da177e4 LT |
116 | /** |
117 | * snd_card_new - create and initialize a soundcard structure | |
118 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
119 | * @xid: card identification (ASCII string) | |
120 | * @module: top level module for locking | |
121 | * @extra_size: allocate this extra size after the main soundcard structure | |
122 | * | |
123 | * Creates and initializes a soundcard structure. | |
124 | * | |
512bbd6a | 125 | * Returns kmallocated snd_card structure. Creates the ALSA control interface |
1da177e4 LT |
126 | * (which is blocked until snd_card_register function is called). |
127 | */ | |
512bbd6a | 128 | struct snd_card *snd_card_new(int idx, const char *xid, |
1da177e4 LT |
129 | struct module *module, int extra_size) |
130 | { | |
512bbd6a | 131 | struct snd_card *card; |
1da177e4 LT |
132 | int err; |
133 | ||
134 | if (extra_size < 0) | |
135 | extra_size = 0; | |
ca2c0966 | 136 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
1da177e4 LT |
137 | if (card == NULL) |
138 | return NULL; | |
139 | if (xid) { | |
140 | if (!snd_info_check_reserved_words(xid)) | |
141 | goto __error; | |
142 | strlcpy(card->id, xid, sizeof(card->id)); | |
143 | } | |
144 | err = 0; | |
746df948 | 145 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
146 | if (idx < 0) { |
147 | int idx2; | |
148 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
5c33dd70 | 149 | /* idx == -1 == 0xffff means: take any free slot */ |
1da177e4 | 150 | if (~snd_cards_lock & idx & 1<<idx2) { |
304cd07f TI |
151 | if (module_slot_mismatch(module, idx2)) |
152 | continue; | |
1da177e4 LT |
153 | idx = idx2; |
154 | if (idx >= snd_ecards_limit) | |
155 | snd_ecards_limit = idx + 1; | |
156 | break; | |
157 | } | |
5c33dd70 ON |
158 | } else { |
159 | if (idx < snd_ecards_limit) { | |
160 | if (snd_cards_lock & (1 << idx)) | |
161 | err = -EBUSY; /* invalid */ | |
162 | } else { | |
163 | if (idx < SNDRV_CARDS) | |
164 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
165 | else | |
166 | err = -ENODEV; | |
167 | } | |
168 | } | |
1da177e4 | 169 | if (idx < 0 || err < 0) { |
746df948 | 170 | mutex_unlock(&snd_card_mutex); |
5c33dd70 ON |
171 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
172 | idx, snd_ecards_limit - 1, err); | |
1da177e4 LT |
173 | goto __error; |
174 | } | |
175 | snd_cards_lock |= 1 << idx; /* lock it */ | |
746df948 | 176 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
177 | card->number = idx; |
178 | card->module = module; | |
179 | INIT_LIST_HEAD(&card->devices); | |
180 | init_rwsem(&card->controls_rwsem); | |
181 | rwlock_init(&card->ctl_files_rwlock); | |
182 | INIT_LIST_HEAD(&card->controls); | |
183 | INIT_LIST_HEAD(&card->ctl_files); | |
184 | spin_lock_init(&card->files_lock); | |
185 | init_waitqueue_head(&card->shutdown_sleep); | |
1da177e4 | 186 | #ifdef CONFIG_PM |
1a60d4c5 | 187 | mutex_init(&card->power_lock); |
1da177e4 LT |
188 | init_waitqueue_head(&card->power_sleep); |
189 | #endif | |
190 | /* the control interface cannot be accessed from the user space until */ | |
191 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
192 | if ((err = snd_ctl_create(card)) < 0) { | |
193 | snd_printd("unable to register control minors\n"); | |
194 | goto __error; | |
195 | } | |
196 | if ((err = snd_info_card_create(card)) < 0) { | |
197 | snd_printd("unable to create card info\n"); | |
198 | goto __error_ctl; | |
199 | } | |
200 | if (extra_size > 0) | |
512bbd6a | 201 | card->private_data = (char *)card + sizeof(struct snd_card); |
1da177e4 LT |
202 | return card; |
203 | ||
204 | __error_ctl: | |
205 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
206 | __error: | |
207 | kfree(card); | |
208 | return NULL; | |
209 | } | |
210 | ||
c0d3fb39 TI |
211 | EXPORT_SYMBOL(snd_card_new); |
212 | ||
746df948 TI |
213 | /* return non-zero if a card is already locked */ |
214 | int snd_card_locked(int card) | |
215 | { | |
216 | int locked; | |
217 | ||
218 | mutex_lock(&snd_card_mutex); | |
219 | locked = snd_cards_lock & (1 << card); | |
220 | mutex_unlock(&snd_card_mutex); | |
221 | return locked; | |
222 | } | |
223 | ||
b3b0abe1 CL |
224 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
225 | { | |
226 | return -ENODEV; | |
227 | } | |
228 | ||
229 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
230 | size_t count, loff_t *offset) | |
231 | { | |
232 | return -ENODEV; | |
233 | } | |
234 | ||
235 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
236 | size_t count, loff_t *offset) | |
237 | { | |
238 | return -ENODEV; | |
239 | } | |
240 | ||
a9edfc60 KW |
241 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
242 | { | |
243 | struct snd_monitor_file *df = NULL, *_df; | |
244 | ||
245 | spin_lock(&shutdown_lock); | |
246 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
247 | if (_df->file == file) { | |
248 | df = _df; | |
249 | break; | |
250 | } | |
251 | } | |
252 | spin_unlock(&shutdown_lock); | |
253 | ||
254 | if (likely(df)) | |
255 | return df->disconnected_f_op->release(inode, file); | |
256 | ||
257 | panic("%s(%p, %p) failed!", __FUNCTION__, inode, file); | |
258 | } | |
259 | ||
1da177e4 LT |
260 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
261 | { | |
262 | return POLLERR | POLLNVAL; | |
263 | } | |
264 | ||
b3b0abe1 CL |
265 | static long snd_disconnect_ioctl(struct file *file, |
266 | unsigned int cmd, unsigned long arg) | |
267 | { | |
268 | return -ENODEV; | |
269 | } | |
270 | ||
271 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
272 | { | |
273 | return -ENODEV; | |
274 | } | |
275 | ||
276 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
277 | { | |
278 | return -ENODEV; | |
279 | } | |
280 | ||
9c2e08c5 | 281 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
282 | { |
283 | .owner = THIS_MODULE, | |
284 | .llseek = snd_disconnect_llseek, | |
285 | .read = snd_disconnect_read, | |
286 | .write = snd_disconnect_write, | |
287 | .release = snd_disconnect_release, | |
288 | .poll = snd_disconnect_poll, | |
289 | .unlocked_ioctl = snd_disconnect_ioctl, | |
290 | #ifdef CONFIG_COMPAT | |
291 | .compat_ioctl = snd_disconnect_ioctl, | |
292 | #endif | |
293 | .mmap = snd_disconnect_mmap, | |
294 | .fasync = snd_disconnect_fasync | |
295 | }; | |
296 | ||
1da177e4 LT |
297 | /** |
298 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
299 | * @card: soundcard structure | |
300 | * | |
301 | * Disconnects all APIs from the file-operations (user space). | |
302 | * | |
303 | * Returns zero, otherwise a negative error code. | |
304 | * | |
305 | * Note: The current implementation replaces all active file->f_op with special | |
306 | * dummy file operations (they do nothing except release). | |
307 | */ | |
512bbd6a | 308 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
309 | { |
310 | struct snd_monitor_file *mfile; | |
311 | struct file *file; | |
1da177e4 LT |
312 | int err; |
313 | ||
314 | spin_lock(&card->files_lock); | |
315 | if (card->shutdown) { | |
316 | spin_unlock(&card->files_lock); | |
317 | return 0; | |
318 | } | |
319 | card->shutdown = 1; | |
320 | spin_unlock(&card->files_lock); | |
321 | ||
322 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 323 | mutex_lock(&snd_card_mutex); |
1da177e4 | 324 | snd_cards[card->number] = NULL; |
746df948 | 325 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
326 | |
327 | /* phase 2: replace file->f_op with special dummy operations */ | |
328 | ||
329 | spin_lock(&card->files_lock); | |
330 | mfile = card->files; | |
331 | while (mfile) { | |
332 | file = mfile->file; | |
333 | ||
334 | /* it's critical part, use endless loop */ | |
335 | /* we have no room to fail */ | |
a9edfc60 | 336 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 337 | |
a9edfc60 KW |
338 | spin_lock(&shutdown_lock); |
339 | list_add(&mfile->shutdown_list, &shutdown_files); | |
340 | spin_unlock(&shutdown_lock); | |
1da177e4 | 341 | |
a9edfc60 KW |
342 | fops_get(&snd_shutdown_f_ops); |
343 | mfile->file->f_op = &snd_shutdown_f_ops; | |
1da177e4 LT |
344 | |
345 | mfile = mfile->next; | |
346 | } | |
347 | spin_unlock(&card->files_lock); | |
348 | ||
349 | /* phase 3: notify all connected devices about disconnection */ | |
350 | /* at this point, they cannot respond to any calls except release() */ | |
351 | ||
352 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
353 | if (snd_mixer_oss_notify_callback) | |
354 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
355 | #endif | |
356 | ||
357 | /* notify all devices that we are disconnected */ | |
358 | err = snd_device_disconnect_all(card); | |
359 | if (err < 0) | |
360 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
361 | ||
746d4a02 | 362 | snd_info_card_disconnect(card); |
1da177e4 LT |
363 | return 0; |
364 | } | |
365 | ||
c0d3fb39 TI |
366 | EXPORT_SYMBOL(snd_card_disconnect); |
367 | ||
1da177e4 LT |
368 | /** |
369 | * snd_card_free - frees given soundcard structure | |
370 | * @card: soundcard structure | |
371 | * | |
372 | * This function releases the soundcard structure and the all assigned | |
373 | * devices automatically. That is, you don't have to release the devices | |
374 | * by yourself. | |
375 | * | |
376 | * Returns zero. Frees all associated devices and frees the control | |
377 | * interface associated to given soundcard. | |
378 | */ | |
c461482c | 379 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 380 | { |
1da177e4 LT |
381 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
382 | if (snd_mixer_oss_notify_callback) | |
383 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
384 | #endif | |
385 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
386 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
387 | /* Fatal, but this situation should never occur */ | |
388 | } | |
389 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
390 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
391 | /* Fatal, but this situation should never occur */ | |
392 | } | |
393 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
394 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
395 | /* Fatal, but this situation should never occur */ | |
396 | } | |
397 | if (card->private_free) | |
398 | card->private_free(card); | |
746d4a02 | 399 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
400 | if (snd_info_card_free(card) < 0) { |
401 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
402 | /* Not fatal error */ | |
403 | } | |
7d2aae1e TI |
404 | #ifndef CONFIG_SYSFS_DEPRECATED |
405 | if (card->card_dev) | |
406 | device_unregister(card->card_dev); | |
407 | #endif | |
c461482c TI |
408 | kfree(card); |
409 | return 0; | |
410 | } | |
411 | ||
412 | static int snd_card_free_prepare(struct snd_card *card) | |
413 | { | |
414 | if (card == NULL) | |
415 | return -EINVAL; | |
416 | (void) snd_card_disconnect(card); | |
746df948 | 417 | mutex_lock(&snd_card_mutex); |
c461482c | 418 | snd_cards[card->number] = NULL; |
1da177e4 | 419 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 420 | mutex_unlock(&snd_card_mutex); |
c461482c TI |
421 | #ifdef CONFIG_PM |
422 | wake_up(&card->power_sleep); | |
423 | #endif | |
424 | return 0; | |
425 | } | |
426 | ||
427 | int snd_card_free_when_closed(struct snd_card *card) | |
428 | { | |
429 | int free_now = 0; | |
430 | int ret = snd_card_free_prepare(card); | |
431 | if (ret) | |
432 | return ret; | |
433 | ||
434 | spin_lock(&card->files_lock); | |
435 | if (card->files == NULL) | |
436 | free_now = 1; | |
437 | else | |
438 | card->free_on_last_close = 1; | |
439 | spin_unlock(&card->files_lock); | |
440 | ||
441 | if (free_now) | |
442 | snd_card_do_free(card); | |
443 | return 0; | |
444 | } | |
445 | ||
446 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
447 | ||
448 | int snd_card_free(struct snd_card *card) | |
449 | { | |
450 | int ret = snd_card_free_prepare(card); | |
451 | if (ret) | |
452 | return ret; | |
453 | ||
454 | /* wait, until all devices are ready for the free operation */ | |
455 | wait_event(card->shutdown_sleep, card->files == NULL); | |
456 | snd_card_do_free(card); | |
1da177e4 LT |
457 | return 0; |
458 | } | |
459 | ||
c0d3fb39 TI |
460 | EXPORT_SYMBOL(snd_card_free); |
461 | ||
512bbd6a | 462 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 463 | { |
d001544d | 464 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
465 | char *id, *spos; |
466 | ||
467 | id = spos = card->shortname; | |
468 | while (*id != '\0') { | |
469 | if (*id == ' ') | |
470 | spos = id + 1; | |
471 | id++; | |
472 | } | |
473 | id = card->id; | |
474 | while (*spos != '\0' && !isalnum(*spos)) | |
475 | spos++; | |
476 | if (isdigit(*spos)) | |
477 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
478 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
479 | if (isalnum(*spos)) | |
480 | *id++ = *spos; | |
481 | spos++; | |
482 | } | |
483 | *id = '\0'; | |
484 | ||
485 | id = card->id; | |
486 | ||
487 | if (*id == '\0') | |
488 | strcpy(id, "default"); | |
489 | ||
490 | while (1) { | |
491 | if (loops-- == 0) { | |
492 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
493 | strcpy(card->id, card->proc_root->name); | |
494 | return; | |
495 | } | |
496 | if (!snd_info_check_reserved_words(id)) | |
497 | goto __change; | |
498 | for (i = 0; i < snd_ecards_limit; i++) { | |
499 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
500 | goto __change; | |
501 | } | |
502 | break; | |
503 | ||
504 | __change: | |
505 | len = strlen(id); | |
d001544d CL |
506 | if (idx_flag) { |
507 | if (id[len-1] != '9') | |
508 | id[len-1]++; | |
509 | else | |
510 | id[len-1] = 'A'; | |
511 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
512 | strcat(id, "_1"); |
513 | idx_flag++; | |
514 | } else { | |
515 | spos = id + len - 2; | |
516 | if ((size_t)len <= sizeof(card->id) - 2) | |
517 | spos++; | |
518 | *spos++ = '_'; | |
519 | *spos++ = '1'; | |
520 | *spos++ = '\0'; | |
521 | idx_flag++; | |
522 | } | |
523 | } | |
524 | } | |
525 | ||
526 | /** | |
527 | * snd_card_register - register the soundcard | |
528 | * @card: soundcard structure | |
529 | * | |
530 | * This function registers all the devices assigned to the soundcard. | |
531 | * Until calling this, the ALSA control interface is blocked from the | |
532 | * external accesses. Thus, you should call this function at the end | |
533 | * of the initialization of the card. | |
534 | * | |
535 | * Returns zero otherwise a negative error code if the registrain failed. | |
536 | */ | |
512bbd6a | 537 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
538 | { |
539 | int err; | |
1da177e4 | 540 | |
7c22f1aa | 541 | snd_assert(card != NULL, return -EINVAL); |
7d2aae1e TI |
542 | #ifndef CONFIG_SYSFS_DEPRECATED |
543 | if (!card->card_dev) { | |
544 | card->card_dev = device_create(sound_class, card->dev, 0, | |
545 | "card%i", card->number); | |
546 | if (IS_ERR(card->card_dev)) | |
547 | card->card_dev = NULL; | |
d80f19fa | 548 | } |
7d2aae1e | 549 | #endif |
1da177e4 LT |
550 | if ((err = snd_device_register_all(card)) < 0) |
551 | return err; | |
746df948 | 552 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
553 | if (snd_cards[card->number]) { |
554 | /* already registered */ | |
746df948 | 555 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
556 | return 0; |
557 | } | |
558 | if (card->id[0] == '\0') | |
559 | choose_default_id(card); | |
560 | snd_cards[card->number] = card; | |
746df948 | 561 | mutex_unlock(&snd_card_mutex); |
e28563cc | 562 | init_info_for_card(card); |
1da177e4 LT |
563 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
564 | if (snd_mixer_oss_notify_callback) | |
565 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
566 | #endif | |
567 | return 0; | |
568 | } | |
569 | ||
c0d3fb39 TI |
570 | EXPORT_SYMBOL(snd_card_register); |
571 | ||
e28563cc | 572 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 573 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 574 | |
a381a7a6 TI |
575 | static void snd_card_info_read(struct snd_info_entry *entry, |
576 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
577 | { |
578 | int idx, count; | |
512bbd6a | 579 | struct snd_card *card; |
1da177e4 LT |
580 | |
581 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 582 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
583 | if ((card = snd_cards[idx]) != NULL) { |
584 | count++; | |
d001544d | 585 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
586 | idx, |
587 | card->id, | |
588 | card->driver, | |
589 | card->shortname); | |
d001544d | 590 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
591 | card->longname); |
592 | } | |
746df948 | 593 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
594 | } |
595 | if (!count) | |
596 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
597 | } | |
598 | ||
e28563cc | 599 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 600 | |
512bbd6a | 601 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
602 | { |
603 | int idx, count; | |
512bbd6a | 604 | struct snd_card *card; |
1da177e4 LT |
605 | |
606 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 607 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
608 | if ((card = snd_cards[idx]) != NULL) { |
609 | count++; | |
610 | snd_iprintf(buffer, "%s\n", card->longname); | |
611 | } | |
746df948 | 612 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
613 | } |
614 | if (!count) { | |
615 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
616 | } | |
617 | } | |
618 | ||
619 | #endif | |
620 | ||
621 | #ifdef MODULE | |
512bbd6a TI |
622 | static struct snd_info_entry *snd_card_module_info_entry; |
623 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
624 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
625 | { |
626 | int idx; | |
512bbd6a | 627 | struct snd_card *card; |
1da177e4 LT |
628 | |
629 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 630 | mutex_lock(&snd_card_mutex); |
1da177e4 | 631 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
632 | snd_iprintf(buffer, "%2i %s\n", |
633 | idx, card->module->name); | |
746df948 | 634 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
635 | } |
636 | } | |
637 | #endif | |
638 | ||
639 | int __init snd_card_info_init(void) | |
640 | { | |
512bbd6a | 641 | struct snd_info_entry *entry; |
1da177e4 LT |
642 | |
643 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
644 | if (! entry) |
645 | return -ENOMEM; | |
1da177e4 LT |
646 | entry->c.text.read = snd_card_info_read; |
647 | if (snd_info_register(entry) < 0) { | |
648 | snd_info_free_entry(entry); | |
649 | return -ENOMEM; | |
650 | } | |
651 | snd_card_info_entry = entry; | |
652 | ||
653 | #ifdef MODULE | |
654 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
655 | if (entry) { | |
1da177e4 LT |
656 | entry->c.text.read = snd_card_module_info_read; |
657 | if (snd_info_register(entry) < 0) | |
658 | snd_info_free_entry(entry); | |
659 | else | |
660 | snd_card_module_info_entry = entry; | |
661 | } | |
662 | #endif | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | int __exit snd_card_info_done(void) | |
668 | { | |
746d4a02 | 669 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 670 | #ifdef MODULE |
746d4a02 | 671 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
672 | #endif |
673 | return 0; | |
674 | } | |
675 | ||
e28563cc TI |
676 | #endif /* CONFIG_PROC_FS */ |
677 | ||
1da177e4 LT |
678 | /** |
679 | * snd_component_add - add a component string | |
680 | * @card: soundcard structure | |
681 | * @component: the component id string | |
682 | * | |
683 | * This function adds the component id string to the supported list. | |
684 | * The component can be referred from the alsa-lib. | |
685 | * | |
686 | * Returns zero otherwise a negative error code. | |
687 | */ | |
688 | ||
512bbd6a | 689 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
690 | { |
691 | char *ptr; | |
692 | int len = strlen(component); | |
693 | ||
694 | ptr = strstr(card->components, component); | |
695 | if (ptr != NULL) { | |
696 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
697 | return 1; | |
698 | } | |
699 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
700 | snd_BUG(); | |
701 | return -ENOMEM; | |
702 | } | |
703 | if (card->components[0] != '\0') | |
704 | strcat(card->components, " "); | |
705 | strcat(card->components, component); | |
706 | return 0; | |
707 | } | |
708 | ||
c0d3fb39 TI |
709 | EXPORT_SYMBOL(snd_component_add); |
710 | ||
1da177e4 LT |
711 | /** |
712 | * snd_card_file_add - add the file to the file list of the card | |
713 | * @card: soundcard structure | |
714 | * @file: file pointer | |
715 | * | |
716 | * This function adds the file to the file linked-list of the card. | |
717 | * This linked-list is used to keep tracking the connection state, | |
718 | * and to avoid the release of busy resources by hotplug. | |
719 | * | |
720 | * Returns zero or a negative error code. | |
721 | */ | |
512bbd6a | 722 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
723 | { |
724 | struct snd_monitor_file *mfile; | |
725 | ||
726 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
727 | if (mfile == NULL) | |
728 | return -ENOMEM; | |
729 | mfile->file = file; | |
a9edfc60 | 730 | mfile->disconnected_f_op = NULL; |
1da177e4 LT |
731 | mfile->next = NULL; |
732 | spin_lock(&card->files_lock); | |
733 | if (card->shutdown) { | |
734 | spin_unlock(&card->files_lock); | |
735 | kfree(mfile); | |
736 | return -ENODEV; | |
737 | } | |
738 | mfile->next = card->files; | |
739 | card->files = mfile; | |
740 | spin_unlock(&card->files_lock); | |
741 | return 0; | |
742 | } | |
743 | ||
c0d3fb39 TI |
744 | EXPORT_SYMBOL(snd_card_file_add); |
745 | ||
1da177e4 LT |
746 | /** |
747 | * snd_card_file_remove - remove the file from the file list | |
748 | * @card: soundcard structure | |
749 | * @file: file pointer | |
750 | * | |
751 | * This function removes the file formerly added to the card via | |
752 | * snd_card_file_add() function. | |
2b29b13c TI |
753 | * If all files are removed and snd_card_free_when_closed() was |
754 | * called beforehand, it processes the pending release of | |
755 | * resources. | |
1da177e4 LT |
756 | * |
757 | * Returns zero or a negative error code. | |
758 | */ | |
512bbd6a | 759 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
760 | { |
761 | struct snd_monitor_file *mfile, *pfile = NULL; | |
c461482c | 762 | int last_close = 0; |
1da177e4 LT |
763 | |
764 | spin_lock(&card->files_lock); | |
765 | mfile = card->files; | |
766 | while (mfile) { | |
767 | if (mfile->file == file) { | |
768 | if (pfile) | |
769 | pfile->next = mfile->next; | |
770 | else | |
771 | card->files = mfile->next; | |
772 | break; | |
773 | } | |
774 | pfile = mfile; | |
775 | mfile = mfile->next; | |
776 | } | |
a9edfc60 KW |
777 | if (mfile && mfile->disconnected_f_op) { |
778 | fops_put(mfile->disconnected_f_op); | |
779 | spin_lock(&shutdown_lock); | |
780 | list_del(&mfile->shutdown_list); | |
781 | spin_unlock(&shutdown_lock); | |
782 | } | |
1da177e4 | 783 | if (card->files == NULL) |
c461482c TI |
784 | last_close = 1; |
785 | spin_unlock(&card->files_lock); | |
786 | if (last_close) { | |
1da177e4 | 787 | wake_up(&card->shutdown_sleep); |
c461482c TI |
788 | if (card->free_on_last_close) |
789 | snd_card_do_free(card); | |
790 | } | |
1da177e4 LT |
791 | if (!mfile) { |
792 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
793 | return -ENOENT; | |
794 | } | |
795 | kfree(mfile); | |
796 | return 0; | |
797 | } | |
798 | ||
c0d3fb39 TI |
799 | EXPORT_SYMBOL(snd_card_file_remove); |
800 | ||
1da177e4 LT |
801 | #ifdef CONFIG_PM |
802 | /** | |
803 | * snd_power_wait - wait until the power-state is changed. | |
804 | * @card: soundcard structure | |
805 | * @power_state: expected power state | |
1da177e4 LT |
806 | * |
807 | * Waits until the power-state is changed. | |
808 | * | |
809 | * Note: the power lock must be active before call. | |
810 | */ | |
cbac4b0c | 811 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
812 | { |
813 | wait_queue_t wait; | |
814 | int result = 0; | |
815 | ||
816 | /* fastpath */ | |
817 | if (snd_power_get_state(card) == power_state) | |
818 | return 0; | |
819 | init_waitqueue_entry(&wait, current); | |
820 | add_wait_queue(&card->power_sleep, &wait); | |
821 | while (1) { | |
822 | if (card->shutdown) { | |
823 | result = -ENODEV; | |
824 | break; | |
825 | } | |
826 | if (snd_power_get_state(card) == power_state) | |
827 | break; | |
1da177e4 LT |
828 | set_current_state(TASK_UNINTERRUPTIBLE); |
829 | snd_power_unlock(card); | |
830 | schedule_timeout(30 * HZ); | |
831 | snd_power_lock(card); | |
832 | } | |
833 | remove_wait_queue(&card->power_sleep, &wait); | |
834 | return result; | |
835 | } | |
836 | ||
c0d3fb39 | 837 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 838 | #endif /* CONFIG_PM */ |