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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 | ||
9bf8e7dd | 257 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
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 | ||
f18638dc TI |
314 | if (!card) |
315 | return -EINVAL; | |
316 | ||
1da177e4 LT |
317 | spin_lock(&card->files_lock); |
318 | if (card->shutdown) { | |
319 | spin_unlock(&card->files_lock); | |
320 | return 0; | |
321 | } | |
322 | card->shutdown = 1; | |
323 | spin_unlock(&card->files_lock); | |
324 | ||
325 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 326 | mutex_lock(&snd_card_mutex); |
1da177e4 | 327 | snd_cards[card->number] = NULL; |
f18638dc | 328 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 329 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
330 | |
331 | /* phase 2: replace file->f_op with special dummy operations */ | |
332 | ||
333 | spin_lock(&card->files_lock); | |
334 | mfile = card->files; | |
335 | while (mfile) { | |
336 | file = mfile->file; | |
337 | ||
338 | /* it's critical part, use endless loop */ | |
339 | /* we have no room to fail */ | |
a9edfc60 | 340 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 341 | |
a9edfc60 KW |
342 | spin_lock(&shutdown_lock); |
343 | list_add(&mfile->shutdown_list, &shutdown_files); | |
344 | spin_unlock(&shutdown_lock); | |
1da177e4 | 345 | |
a9edfc60 | 346 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 347 | fops_get(mfile->file->f_op); |
1da177e4 LT |
348 | |
349 | mfile = mfile->next; | |
350 | } | |
351 | spin_unlock(&card->files_lock); | |
352 | ||
353 | /* phase 3: notify all connected devices about disconnection */ | |
354 | /* at this point, they cannot respond to any calls except release() */ | |
355 | ||
356 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
357 | if (snd_mixer_oss_notify_callback) | |
358 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
359 | #endif | |
360 | ||
361 | /* notify all devices that we are disconnected */ | |
362 | err = snd_device_disconnect_all(card); | |
363 | if (err < 0) | |
364 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
365 | ||
746d4a02 | 366 | snd_info_card_disconnect(card); |
73d38b13 TI |
367 | #ifndef CONFIG_SYSFS_DEPRECATED |
368 | if (card->card_dev) { | |
369 | device_unregister(card->card_dev); | |
370 | card->card_dev = NULL; | |
371 | } | |
f18638dc TI |
372 | #endif |
373 | #ifdef CONFIG_PM | |
374 | wake_up(&card->power_sleep); | |
73d38b13 | 375 | #endif |
1da177e4 LT |
376 | return 0; |
377 | } | |
378 | ||
c0d3fb39 TI |
379 | EXPORT_SYMBOL(snd_card_disconnect); |
380 | ||
1da177e4 LT |
381 | /** |
382 | * snd_card_free - frees given soundcard structure | |
383 | * @card: soundcard structure | |
384 | * | |
385 | * This function releases the soundcard structure and the all assigned | |
386 | * devices automatically. That is, you don't have to release the devices | |
387 | * by yourself. | |
388 | * | |
389 | * Returns zero. Frees all associated devices and frees the control | |
390 | * interface associated to given soundcard. | |
391 | */ | |
c461482c | 392 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 393 | { |
1da177e4 LT |
394 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
395 | if (snd_mixer_oss_notify_callback) | |
396 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
397 | #endif | |
398 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
399 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
400 | /* Fatal, but this situation should never occur */ | |
401 | } | |
402 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
403 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
404 | /* Fatal, but this situation should never occur */ | |
405 | } | |
406 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
407 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
408 | /* Fatal, but this situation should never occur */ | |
409 | } | |
410 | if (card->private_free) | |
411 | card->private_free(card); | |
746d4a02 | 412 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
413 | if (snd_info_card_free(card) < 0) { |
414 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
415 | /* Not fatal error */ | |
416 | } | |
c461482c TI |
417 | kfree(card); |
418 | return 0; | |
419 | } | |
420 | ||
c461482c TI |
421 | int snd_card_free_when_closed(struct snd_card *card) |
422 | { | |
423 | int free_now = 0; | |
f18638dc | 424 | int ret = snd_card_disconnect(card); |
c461482c TI |
425 | if (ret) |
426 | return ret; | |
427 | ||
428 | spin_lock(&card->files_lock); | |
429 | if (card->files == NULL) | |
430 | free_now = 1; | |
431 | else | |
432 | card->free_on_last_close = 1; | |
433 | spin_unlock(&card->files_lock); | |
434 | ||
435 | if (free_now) | |
436 | snd_card_do_free(card); | |
437 | return 0; | |
438 | } | |
439 | ||
440 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
441 | ||
442 | int snd_card_free(struct snd_card *card) | |
443 | { | |
f18638dc | 444 | int ret = snd_card_disconnect(card); |
c461482c TI |
445 | if (ret) |
446 | return ret; | |
447 | ||
448 | /* wait, until all devices are ready for the free operation */ | |
449 | wait_event(card->shutdown_sleep, card->files == NULL); | |
450 | snd_card_do_free(card); | |
1da177e4 LT |
451 | return 0; |
452 | } | |
453 | ||
c0d3fb39 TI |
454 | EXPORT_SYMBOL(snd_card_free); |
455 | ||
512bbd6a | 456 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 457 | { |
d001544d | 458 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
459 | char *id, *spos; |
460 | ||
461 | id = spos = card->shortname; | |
462 | while (*id != '\0') { | |
463 | if (*id == ' ') | |
464 | spos = id + 1; | |
465 | id++; | |
466 | } | |
467 | id = card->id; | |
468 | while (*spos != '\0' && !isalnum(*spos)) | |
469 | spos++; | |
470 | if (isdigit(*spos)) | |
471 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
472 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
473 | if (isalnum(*spos)) | |
474 | *id++ = *spos; | |
475 | spos++; | |
476 | } | |
477 | *id = '\0'; | |
478 | ||
479 | id = card->id; | |
480 | ||
481 | if (*id == '\0') | |
482 | strcpy(id, "default"); | |
483 | ||
484 | while (1) { | |
485 | if (loops-- == 0) { | |
486 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
487 | strcpy(card->id, card->proc_root->name); | |
488 | return; | |
489 | } | |
490 | if (!snd_info_check_reserved_words(id)) | |
491 | goto __change; | |
492 | for (i = 0; i < snd_ecards_limit; i++) { | |
493 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
494 | goto __change; | |
495 | } | |
496 | break; | |
497 | ||
498 | __change: | |
499 | len = strlen(id); | |
d001544d CL |
500 | if (idx_flag) { |
501 | if (id[len-1] != '9') | |
502 | id[len-1]++; | |
503 | else | |
504 | id[len-1] = 'A'; | |
505 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
506 | strcat(id, "_1"); |
507 | idx_flag++; | |
508 | } else { | |
509 | spos = id + len - 2; | |
510 | if ((size_t)len <= sizeof(card->id) - 2) | |
511 | spos++; | |
512 | *spos++ = '_'; | |
513 | *spos++ = '1'; | |
514 | *spos++ = '\0'; | |
515 | idx_flag++; | |
516 | } | |
517 | } | |
518 | } | |
519 | ||
520 | /** | |
521 | * snd_card_register - register the soundcard | |
522 | * @card: soundcard structure | |
523 | * | |
524 | * This function registers all the devices assigned to the soundcard. | |
525 | * Until calling this, the ALSA control interface is blocked from the | |
526 | * external accesses. Thus, you should call this function at the end | |
527 | * of the initialization of the card. | |
528 | * | |
529 | * Returns zero otherwise a negative error code if the registrain failed. | |
530 | */ | |
512bbd6a | 531 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
532 | { |
533 | int err; | |
1da177e4 | 534 | |
7c22f1aa | 535 | snd_assert(card != NULL, return -EINVAL); |
7d2aae1e TI |
536 | #ifndef CONFIG_SYSFS_DEPRECATED |
537 | if (!card->card_dev) { | |
538 | card->card_dev = device_create(sound_class, card->dev, 0, | |
539 | "card%i", card->number); | |
540 | if (IS_ERR(card->card_dev)) | |
541 | card->card_dev = NULL; | |
d80f19fa | 542 | } |
7d2aae1e | 543 | #endif |
1da177e4 LT |
544 | if ((err = snd_device_register_all(card)) < 0) |
545 | return err; | |
746df948 | 546 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
547 | if (snd_cards[card->number]) { |
548 | /* already registered */ | |
746df948 | 549 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
550 | return 0; |
551 | } | |
552 | if (card->id[0] == '\0') | |
553 | choose_default_id(card); | |
554 | snd_cards[card->number] = card; | |
746df948 | 555 | mutex_unlock(&snd_card_mutex); |
e28563cc | 556 | init_info_for_card(card); |
1da177e4 LT |
557 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
558 | if (snd_mixer_oss_notify_callback) | |
559 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
560 | #endif | |
561 | return 0; | |
562 | } | |
563 | ||
c0d3fb39 TI |
564 | EXPORT_SYMBOL(snd_card_register); |
565 | ||
e28563cc | 566 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 567 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 568 | |
a381a7a6 TI |
569 | static void snd_card_info_read(struct snd_info_entry *entry, |
570 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
571 | { |
572 | int idx, count; | |
512bbd6a | 573 | struct snd_card *card; |
1da177e4 LT |
574 | |
575 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 576 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
577 | if ((card = snd_cards[idx]) != NULL) { |
578 | count++; | |
d001544d | 579 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
580 | idx, |
581 | card->id, | |
582 | card->driver, | |
583 | card->shortname); | |
d001544d | 584 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
585 | card->longname); |
586 | } | |
746df948 | 587 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
588 | } |
589 | if (!count) | |
590 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
591 | } | |
592 | ||
e28563cc | 593 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 594 | |
512bbd6a | 595 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
596 | { |
597 | int idx, count; | |
512bbd6a | 598 | struct snd_card *card; |
1da177e4 LT |
599 | |
600 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 601 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
602 | if ((card = snd_cards[idx]) != NULL) { |
603 | count++; | |
604 | snd_iprintf(buffer, "%s\n", card->longname); | |
605 | } | |
746df948 | 606 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
607 | } |
608 | if (!count) { | |
609 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
610 | } | |
611 | } | |
612 | ||
613 | #endif | |
614 | ||
615 | #ifdef MODULE | |
512bbd6a TI |
616 | static struct snd_info_entry *snd_card_module_info_entry; |
617 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
618 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
619 | { |
620 | int idx; | |
512bbd6a | 621 | struct snd_card *card; |
1da177e4 LT |
622 | |
623 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 624 | mutex_lock(&snd_card_mutex); |
1da177e4 | 625 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
626 | snd_iprintf(buffer, "%2i %s\n", |
627 | idx, card->module->name); | |
746df948 | 628 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
629 | } |
630 | } | |
631 | #endif | |
632 | ||
633 | int __init snd_card_info_init(void) | |
634 | { | |
512bbd6a | 635 | struct snd_info_entry *entry; |
1da177e4 LT |
636 | |
637 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
638 | if (! entry) |
639 | return -ENOMEM; | |
1da177e4 LT |
640 | entry->c.text.read = snd_card_info_read; |
641 | if (snd_info_register(entry) < 0) { | |
642 | snd_info_free_entry(entry); | |
643 | return -ENOMEM; | |
644 | } | |
645 | snd_card_info_entry = entry; | |
646 | ||
647 | #ifdef MODULE | |
648 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
649 | if (entry) { | |
1da177e4 LT |
650 | entry->c.text.read = snd_card_module_info_read; |
651 | if (snd_info_register(entry) < 0) | |
652 | snd_info_free_entry(entry); | |
653 | else | |
654 | snd_card_module_info_entry = entry; | |
655 | } | |
656 | #endif | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
661 | int __exit snd_card_info_done(void) | |
662 | { | |
746d4a02 | 663 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 664 | #ifdef MODULE |
746d4a02 | 665 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
666 | #endif |
667 | return 0; | |
668 | } | |
669 | ||
e28563cc TI |
670 | #endif /* CONFIG_PROC_FS */ |
671 | ||
1da177e4 LT |
672 | /** |
673 | * snd_component_add - add a component string | |
674 | * @card: soundcard structure | |
675 | * @component: the component id string | |
676 | * | |
677 | * This function adds the component id string to the supported list. | |
678 | * The component can be referred from the alsa-lib. | |
679 | * | |
680 | * Returns zero otherwise a negative error code. | |
681 | */ | |
682 | ||
512bbd6a | 683 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
684 | { |
685 | char *ptr; | |
686 | int len = strlen(component); | |
687 | ||
688 | ptr = strstr(card->components, component); | |
689 | if (ptr != NULL) { | |
690 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
691 | return 1; | |
692 | } | |
693 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
694 | snd_BUG(); | |
695 | return -ENOMEM; | |
696 | } | |
697 | if (card->components[0] != '\0') | |
698 | strcat(card->components, " "); | |
699 | strcat(card->components, component); | |
700 | return 0; | |
701 | } | |
702 | ||
c0d3fb39 TI |
703 | EXPORT_SYMBOL(snd_component_add); |
704 | ||
1da177e4 LT |
705 | /** |
706 | * snd_card_file_add - add the file to the file list of the card | |
707 | * @card: soundcard structure | |
708 | * @file: file pointer | |
709 | * | |
710 | * This function adds the file to the file linked-list of the card. | |
711 | * This linked-list is used to keep tracking the connection state, | |
712 | * and to avoid the release of busy resources by hotplug. | |
713 | * | |
714 | * Returns zero or a negative error code. | |
715 | */ | |
512bbd6a | 716 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
717 | { |
718 | struct snd_monitor_file *mfile; | |
719 | ||
720 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
721 | if (mfile == NULL) | |
722 | return -ENOMEM; | |
723 | mfile->file = file; | |
a9edfc60 | 724 | mfile->disconnected_f_op = NULL; |
1da177e4 LT |
725 | mfile->next = NULL; |
726 | spin_lock(&card->files_lock); | |
727 | if (card->shutdown) { | |
728 | spin_unlock(&card->files_lock); | |
729 | kfree(mfile); | |
730 | return -ENODEV; | |
731 | } | |
732 | mfile->next = card->files; | |
733 | card->files = mfile; | |
734 | spin_unlock(&card->files_lock); | |
735 | return 0; | |
736 | } | |
737 | ||
c0d3fb39 TI |
738 | EXPORT_SYMBOL(snd_card_file_add); |
739 | ||
1da177e4 LT |
740 | /** |
741 | * snd_card_file_remove - remove the file from the file list | |
742 | * @card: soundcard structure | |
743 | * @file: file pointer | |
744 | * | |
745 | * This function removes the file formerly added to the card via | |
746 | * snd_card_file_add() function. | |
2b29b13c TI |
747 | * If all files are removed and snd_card_free_when_closed() was |
748 | * called beforehand, it processes the pending release of | |
749 | * resources. | |
1da177e4 LT |
750 | * |
751 | * Returns zero or a negative error code. | |
752 | */ | |
512bbd6a | 753 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
754 | { |
755 | struct snd_monitor_file *mfile, *pfile = NULL; | |
c461482c | 756 | int last_close = 0; |
1da177e4 LT |
757 | |
758 | spin_lock(&card->files_lock); | |
759 | mfile = card->files; | |
760 | while (mfile) { | |
761 | if (mfile->file == file) { | |
762 | if (pfile) | |
763 | pfile->next = mfile->next; | |
764 | else | |
765 | card->files = mfile->next; | |
766 | break; | |
767 | } | |
768 | pfile = mfile; | |
769 | mfile = mfile->next; | |
770 | } | |
a9edfc60 KW |
771 | if (mfile && mfile->disconnected_f_op) { |
772 | fops_put(mfile->disconnected_f_op); | |
773 | spin_lock(&shutdown_lock); | |
774 | list_del(&mfile->shutdown_list); | |
775 | spin_unlock(&shutdown_lock); | |
776 | } | |
1da177e4 | 777 | if (card->files == NULL) |
c461482c TI |
778 | last_close = 1; |
779 | spin_unlock(&card->files_lock); | |
780 | if (last_close) { | |
1da177e4 | 781 | wake_up(&card->shutdown_sleep); |
c461482c TI |
782 | if (card->free_on_last_close) |
783 | snd_card_do_free(card); | |
784 | } | |
1da177e4 LT |
785 | if (!mfile) { |
786 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
787 | return -ENOENT; | |
788 | } | |
789 | kfree(mfile); | |
790 | return 0; | |
791 | } | |
792 | ||
c0d3fb39 TI |
793 | EXPORT_SYMBOL(snd_card_file_remove); |
794 | ||
1da177e4 LT |
795 | #ifdef CONFIG_PM |
796 | /** | |
797 | * snd_power_wait - wait until the power-state is changed. | |
798 | * @card: soundcard structure | |
799 | * @power_state: expected power state | |
1da177e4 LT |
800 | * |
801 | * Waits until the power-state is changed. | |
802 | * | |
803 | * Note: the power lock must be active before call. | |
804 | */ | |
cbac4b0c | 805 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
806 | { |
807 | wait_queue_t wait; | |
808 | int result = 0; | |
809 | ||
810 | /* fastpath */ | |
811 | if (snd_power_get_state(card) == power_state) | |
812 | return 0; | |
813 | init_waitqueue_entry(&wait, current); | |
814 | add_wait_queue(&card->power_sleep, &wait); | |
815 | while (1) { | |
816 | if (card->shutdown) { | |
817 | result = -ENODEV; | |
818 | break; | |
819 | } | |
820 | if (snd_power_get_state(card) == power_state) | |
821 | break; | |
1da177e4 LT |
822 | set_current_state(TASK_UNINTERRUPTIBLE); |
823 | snd_power_unlock(card); | |
824 | schedule_timeout(30 * HZ); | |
825 | snd_power_lock(card); | |
826 | } | |
827 | remove_wait_queue(&card->power_sleep, &wait); | |
828 | return result; | |
829 | } | |
830 | ||
c0d3fb39 | 831 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 832 | #endif /* CONFIG_PM */ |