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