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