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1 | /* |
2 | * Initialization routines |
3 | * Copyright (c) by Jaroslav Kysela <perex@perex.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 <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> |
28 | #include <linux/pm.h> |
29 | |
30 | #include <sound/core.h> |
31 | #include <sound/control.h> |
32 | #include <sound/info.h> |
33 | |
34 | /* monitor files for graceful shutdown (hotplug) */ |
35 | struct snd_monitor_file { |
36 | struct file *file; |
37 | const struct file_operations *disconnected_f_op; |
38 | struct list_head shutdown_list; /* still need to shutdown */ |
39 | struct list_head list; /* link of monitor files */ |
40 | }; |
41 | |
42 | static DEFINE_SPINLOCK(shutdown_lock); |
43 | static LIST_HEAD(shutdown_files); |
44 | |
45 | static const struct file_operations snd_shutdown_f_ops; |
46 | |
47 | static unsigned int snd_cards_lock; /* locked for registering/using */ |
48 | struct snd_card *snd_cards[SNDRV_CARDS]; |
49 | EXPORT_SYMBOL(snd_cards); |
50 | |
51 | static DEFINE_MUTEX(snd_card_mutex); |
52 | |
53 | static char *slots[SNDRV_CARDS]; |
54 | module_param_array(slots, charp, NULL, 0444); |
55 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); |
56 | |
57 | /* return non-zero if the given index is reserved for the given |
58 | * module via slots option |
59 | */ |
60 | static int module_slot_match(struct module *module, int idx) |
61 | { |
62 | int match = 1; |
63 | #ifdef MODULE |
64 | const char *s1, *s2; |
65 | |
66 | if (!module || !module->name || !slots[idx]) |
67 | return 0; |
68 | |
69 | s1 = module->name; |
70 | s2 = slots[idx]; |
71 | if (*s2 == '!') { |
72 | match = 0; /* negative match */ |
73 | s2++; |
74 | } |
75 | /* compare module name strings |
76 | * hyphens are handled as equivalent with underscore |
77 | */ |
78 | for (;;) { |
79 | char c1 = *s1++; |
80 | char c2 = *s2++; |
81 | if (c1 == '-') |
82 | c1 = '_'; |
83 | if (c2 == '-') |
84 | c2 = '_'; |
85 | if (c1 != c2) |
86 | return !match; |
87 | if (!c1) |
88 | break; |
89 | } |
90 | #endif /* MODULE */ |
91 | return match; |
92 | } |
93 | |
94 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
95 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
96 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
97 | #endif |
98 | |
99 | #ifdef CONFIG_PROC_FS |
100 | static void snd_card_id_read(struct snd_info_entry *entry, |
101 | struct snd_info_buffer *buffer) |
102 | { |
103 | snd_iprintf(buffer, "%s\n", entry->card->id); |
104 | } |
105 | |
106 | static inline int init_info_for_card(struct snd_card *card) |
107 | { |
108 | int err; |
109 | struct snd_info_entry *entry; |
110 | |
111 | if ((err = snd_info_card_register(card)) < 0) { |
112 | snd_printd("unable to create card info\n"); |
113 | return err; |
114 | } |
115 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { |
116 | snd_printd("unable to create card entry\n"); |
117 | return err; |
118 | } |
119 | entry->c.text.read = snd_card_id_read; |
120 | if (snd_info_register(entry) < 0) { |
121 | snd_info_free_entry(entry); |
122 | entry = NULL; |
123 | } |
124 | card->proc_id = entry; |
125 | return 0; |
126 | } |
127 | #else /* !CONFIG_PROC_FS */ |
128 | #define init_info_for_card(card) |
129 | #endif |
130 | |
131 | /** |
132 | * snd_card_create - create and initialize a soundcard structure |
133 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
134 | * @xid: card identification (ASCII string) |
135 | * @module: top level module for locking |
136 | * @extra_size: allocate this extra size after the main soundcard structure |
137 | * @card_ret: the pointer to store the created card instance |
138 | * |
139 | * Creates and initializes a soundcard structure. |
140 | * |
141 | * The function allocates snd_card instance via kzalloc with the given |
142 | * space for the driver to use freely. The allocated struct is stored |
143 | * in the given card_ret pointer. |
144 | * |
145 | * Returns zero if successful or a negative error code. |
146 | */ |
147 | int snd_card_create(int idx, const char *xid, |
148 | struct module *module, int extra_size, |
149 | struct snd_card **card_ret) |
150 | { |
151 | struct snd_card *card; |
152 | int err, idx2; |
153 | |
154 | if (snd_BUG_ON(!card_ret)) |
155 | return -EINVAL; |
156 | *card_ret = NULL; |
157 | |
158 | if (extra_size < 0) |
159 | extra_size = 0; |
160 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
161 | if (!card) |
162 | return -ENOMEM; |
163 | if (xid) |
164 | strlcpy(card->id, xid, sizeof(card->id)); |
165 | err = 0; |
166 | mutex_lock(&snd_card_mutex); |
167 | if (idx < 0) { |
168 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
169 | /* idx == -1 == 0xffff means: take any free slot */ |
170 | if (~snd_cards_lock & idx & 1<<idx2) { |
171 | if (module_slot_match(module, idx2)) { |
172 | idx = idx2; |
173 | break; |
174 | } |
175 | } |
176 | } |
177 | if (idx < 0) { |
178 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
179 | /* idx == -1 == 0xffff means: take any free slot */ |
180 | if (~snd_cards_lock & idx & 1<<idx2) { |
181 | if (!slots[idx2] || !*slots[idx2]) { |
182 | idx = idx2; |
183 | break; |
184 | } |
185 | } |
186 | } |
187 | if (idx < 0) |
188 | err = -ENODEV; |
189 | else if (idx < snd_ecards_limit) { |
190 | if (snd_cards_lock & (1 << idx)) |
191 | err = -EBUSY; /* invalid */ |
192 | } else if (idx >= SNDRV_CARDS) |
193 | err = -ENODEV; |
194 | if (err < 0) { |
195 | mutex_unlock(&snd_card_mutex); |
196 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
197 | idx, snd_ecards_limit - 1, err); |
198 | goto __error; |
199 | } |
200 | snd_cards_lock |= 1 << idx; /* lock it */ |
201 | if (idx >= snd_ecards_limit) |
202 | snd_ecards_limit = idx + 1; /* increase the limit */ |
203 | mutex_unlock(&snd_card_mutex); |
204 | card->number = idx; |
205 | card->module = module; |
206 | INIT_LIST_HEAD(&card->devices); |
207 | init_rwsem(&card->controls_rwsem); |
208 | rwlock_init(&card->ctl_files_rwlock); |
209 | INIT_LIST_HEAD(&card->controls); |
210 | INIT_LIST_HEAD(&card->ctl_files); |
211 | spin_lock_init(&card->files_lock); |
212 | INIT_LIST_HEAD(&card->files_list); |
213 | init_waitqueue_head(&card->shutdown_sleep); |
214 | #ifdef CONFIG_PM |
215 | mutex_init(&card->power_lock); |
216 | init_waitqueue_head(&card->power_sleep); |
217 | #endif |
218 | /* the control interface cannot be accessed from the user space until */ |
219 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ |
220 | err = snd_ctl_create(card); |
221 | if (err < 0) { |
222 | snd_printk(KERN_ERR "unable to register control minors\n"); |
223 | goto __error; |
224 | } |
225 | err = snd_info_card_create(card); |
226 | if (err < 0) { |
227 | snd_printk(KERN_ERR "unable to create card info\n"); |
228 | goto __error_ctl; |
229 | } |
230 | if (extra_size > 0) |
231 | card->private_data = (char *)card + sizeof(struct snd_card); |
232 | *card_ret = card; |
233 | return 0; |
234 | |
235 | __error_ctl: |
236 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); |
237 | __error: |
238 | kfree(card); |
239 | return err; |
240 | } |
241 | EXPORT_SYMBOL(snd_card_create); |
242 | |
243 | /* return non-zero if a card is already locked */ |
244 | int snd_card_locked(int card) |
245 | { |
246 | int locked; |
247 | |
248 | mutex_lock(&snd_card_mutex); |
249 | locked = snd_cards_lock & (1 << card); |
250 | mutex_unlock(&snd_card_mutex); |
251 | return locked; |
252 | } |
253 | |
254 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
255 | { |
256 | return -ENODEV; |
257 | } |
258 | |
259 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, |
260 | size_t count, loff_t *offset) |
261 | { |
262 | return -ENODEV; |
263 | } |
264 | |
265 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, |
266 | size_t count, loff_t *offset) |
267 | { |
268 | return -ENODEV; |
269 | } |
270 | |
271 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
272 | { |
273 | struct snd_monitor_file *df = NULL, *_df; |
274 | |
275 | spin_lock(&shutdown_lock); |
276 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { |
277 | if (_df->file == file) { |
278 | df = _df; |
279 | list_del_init(&df->shutdown_list); |
280 | break; |
281 | } |
282 | } |
283 | spin_unlock(&shutdown_lock); |
284 | |
285 | if (likely(df)) { |
286 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) |
287 | df->disconnected_f_op->fasync(-1, file, 0); |
288 | return df->disconnected_f_op->release(inode, file); |
289 | } |
290 | |
291 | panic("%s(%p, %p) failed!", __func__, inode, file); |
292 | } |
293 | |
294 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
295 | { |
296 | return POLLERR | POLLNVAL; |
297 | } |
298 | |
299 | static long snd_disconnect_ioctl(struct file *file, |
300 | unsigned int cmd, unsigned long arg) |
301 | { |
302 | return -ENODEV; |
303 | } |
304 | |
305 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) |
306 | { |
307 | return -ENODEV; |
308 | } |
309 | |
310 | static int snd_disconnect_fasync(int fd, struct file *file, int on) |
311 | { |
312 | return -ENODEV; |
313 | } |
314 | |
315 | static const struct file_operations snd_shutdown_f_ops = |
316 | { |
317 | .owner = THIS_MODULE, |
318 | .llseek = snd_disconnect_llseek, |
319 | .read = snd_disconnect_read, |
320 | .write = snd_disconnect_write, |
321 | .release = snd_disconnect_release, |
322 | .poll = snd_disconnect_poll, |
323 | .unlocked_ioctl = snd_disconnect_ioctl, |
324 | #ifdef CONFIG_COMPAT |
325 | .compat_ioctl = snd_disconnect_ioctl, |
326 | #endif |
327 | .mmap = snd_disconnect_mmap, |
328 | .fasync = snd_disconnect_fasync |
329 | }; |
330 | |
331 | /** |
332 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) |
333 | * @card: soundcard structure |
334 | * |
335 | * Disconnects all APIs from the file-operations (user space). |
336 | * |
337 | * Returns zero, otherwise a negative error code. |
338 | * |
339 | * Note: The current implementation replaces all active file->f_op with special |
340 | * dummy file operations (they do nothing except release). |
341 | */ |
342 | int snd_card_disconnect(struct snd_card *card) |
343 | { |
344 | struct snd_monitor_file *mfile; |
345 | struct file *file; |
346 | int err; |
347 | |
348 | if (!card) |
349 | return -EINVAL; |
350 | |
351 | spin_lock(&card->files_lock); |
352 | if (card->shutdown) { |
353 | spin_unlock(&card->files_lock); |
354 | return 0; |
355 | } |
356 | card->shutdown = 1; |
357 | spin_unlock(&card->files_lock); |
358 | |
359 | /* phase 1: disable fops (user space) operations for ALSA API */ |
360 | mutex_lock(&snd_card_mutex); |
361 | snd_cards[card->number] = NULL; |
362 | snd_cards_lock &= ~(1 << card->number); |
363 | mutex_unlock(&snd_card_mutex); |
364 | |
365 | /* phase 2: replace file->f_op with special dummy operations */ |
366 | |
367 | spin_lock(&card->files_lock); |
368 | list_for_each_entry(mfile, &card->files_list, list) { |
369 | file = mfile->file; |
370 | |
371 | /* it's critical part, use endless loop */ |
372 | /* we have no room to fail */ |
373 | mfile->disconnected_f_op = mfile->file->f_op; |
374 | |
375 | spin_lock(&shutdown_lock); |
376 | list_add(&mfile->shutdown_list, &shutdown_files); |
377 | spin_unlock(&shutdown_lock); |
378 | |
379 | mfile->file->f_op = &snd_shutdown_f_ops; |
380 | fops_get(mfile->file->f_op); |
381 | } |
382 | spin_unlock(&card->files_lock); |
383 | |
384 | /* phase 3: notify all connected devices about disconnection */ |
385 | /* at this point, they cannot respond to any calls except release() */ |
386 | |
387 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
388 | if (snd_mixer_oss_notify_callback) |
389 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); |
390 | #endif |
391 | |
392 | /* notify all devices that we are disconnected */ |
393 | err = snd_device_disconnect_all(card); |
394 | if (err < 0) |
395 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); |
396 | |
397 | snd_info_card_disconnect(card); |
398 | #ifndef CONFIG_SYSFS_DEPRECATED |
399 | if (card->card_dev) { |
400 | device_unregister(card->card_dev); |
401 | card->card_dev = NULL; |
402 | } |
403 | #endif |
404 | #ifdef CONFIG_PM |
405 | wake_up(&card->power_sleep); |
406 | #endif |
407 | return 0; |
408 | } |
409 | |
410 | EXPORT_SYMBOL(snd_card_disconnect); |
411 | |
412 | /** |
413 | * snd_card_free - frees given soundcard structure |
414 | * @card: soundcard structure |
415 | * |
416 | * This function releases the soundcard structure and the all assigned |
417 | * devices automatically. That is, you don't have to release the devices |
418 | * by yourself. |
419 | * |
420 | * Returns zero. Frees all associated devices and frees the control |
421 | * interface associated to given soundcard. |
422 | */ |
423 | static int snd_card_do_free(struct snd_card *card) |
424 | { |
425 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
426 | if (snd_mixer_oss_notify_callback) |
427 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); |
428 | #endif |
429 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { |
430 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); |
431 | /* Fatal, but this situation should never occur */ |
432 | } |
433 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { |
434 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); |
435 | /* Fatal, but this situation should never occur */ |
436 | } |
437 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { |
438 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); |
439 | /* Fatal, but this situation should never occur */ |
440 | } |
441 | if (card->private_free) |
442 | card->private_free(card); |
443 | snd_info_free_entry(card->proc_id); |
444 | if (snd_info_card_free(card) < 0) { |
445 | snd_printk(KERN_WARNING "unable to free card info\n"); |
446 | /* Not fatal error */ |
447 | } |
448 | kfree(card); |
449 | return 0; |
450 | } |
451 | |
452 | int snd_card_free_when_closed(struct snd_card *card) |
453 | { |
454 | int free_now = 0; |
455 | int ret = snd_card_disconnect(card); |
456 | if (ret) |
457 | return ret; |
458 | |
459 | spin_lock(&card->files_lock); |
460 | if (list_empty(&card->files_list)) |
461 | free_now = 1; |
462 | else |
463 | card->free_on_last_close = 1; |
464 | spin_unlock(&card->files_lock); |
465 | |
466 | if (free_now) |
467 | snd_card_do_free(card); |
468 | return 0; |
469 | } |
470 | |
471 | EXPORT_SYMBOL(snd_card_free_when_closed); |
472 | |
473 | int snd_card_free(struct snd_card *card) |
474 | { |
475 | int ret = snd_card_disconnect(card); |
476 | if (ret) |
477 | return ret; |
478 | |
479 | /* wait, until all devices are ready for the free operation */ |
480 | wait_event(card->shutdown_sleep, list_empty(&card->files_list)); |
481 | snd_card_do_free(card); |
482 | return 0; |
483 | } |
484 | |
485 | EXPORT_SYMBOL(snd_card_free); |
486 | |
487 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *nid) |
488 | { |
489 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
490 | const char *spos, *src; |
491 | char *id; |
492 | |
493 | if (nid == NULL) { |
494 | id = card->shortname; |
495 | spos = src = id; |
496 | while (*id != '\0') { |
497 | if (*id == ' ') |
498 | spos = id + 1; |
499 | id++; |
500 | } |
501 | } else { |
502 | spos = src = nid; |
503 | } |
504 | id = card->id; |
505 | while (*spos != '\0' && !isalnum(*spos)) |
506 | spos++; |
507 | if (isdigit(*spos)) |
508 | *id++ = isalpha(src[0]) ? src[0] : 'D'; |
509 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { |
510 | if (isalnum(*spos)) |
511 | *id++ = *spos; |
512 | spos++; |
513 | } |
514 | *id = '\0'; |
515 | |
516 | id = card->id; |
517 | |
518 | if (*id == '\0') |
519 | strcpy(id, "default"); |
520 | |
521 | while (1) { |
522 | if (loops-- == 0) { |
523 | snd_printk(KERN_ERR "unable to set card id (%s)\n", id); |
524 | strcpy(card->id, card->proc_root->name); |
525 | return; |
526 | } |
527 | if (!snd_info_check_reserved_words(id)) |
528 | goto __change; |
529 | for (i = 0; i < snd_ecards_limit; i++) { |
530 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) |
531 | goto __change; |
532 | } |
533 | break; |
534 | |
535 | __change: |
536 | len = strlen(id); |
537 | if (idx_flag) { |
538 | if (id[len-1] != '9') |
539 | id[len-1]++; |
540 | else |
541 | id[len-1] = 'A'; |
542 | } else if ((size_t)len <= sizeof(card->id) - 3) { |
543 | strcat(id, "_1"); |
544 | idx_flag++; |
545 | } else { |
546 | spos = id + len - 2; |
547 | if ((size_t)len <= sizeof(card->id) - 2) |
548 | spos++; |
549 | *(char *)spos++ = '_'; |
550 | *(char *)spos++ = '1'; |
551 | *(char *)spos++ = '\0'; |
552 | idx_flag++; |
553 | } |
554 | } |
555 | } |
556 | |
557 | /** |
558 | * snd_card_set_id - set card identification name |
559 | * @card: soundcard structure |
560 | * @nid: new identification string |
561 | * |
562 | * This function sets the card identification and checks for name |
563 | * collisions. |
564 | */ |
565 | void snd_card_set_id(struct snd_card *card, const char *nid) |
566 | { |
567 | /* check if user specified own card->id */ |
568 | if (card->id[0] != '\0') |
569 | return; |
570 | mutex_lock(&snd_card_mutex); |
571 | snd_card_set_id_no_lock(card, nid); |
572 | mutex_unlock(&snd_card_mutex); |
573 | } |
574 | EXPORT_SYMBOL(snd_card_set_id); |
575 | |
576 | #ifndef CONFIG_SYSFS_DEPRECATED |
577 | static ssize_t |
578 | card_id_show_attr(struct device *dev, |
579 | struct device_attribute *attr, char *buf) |
580 | { |
581 | struct snd_card *card = dev_get_drvdata(dev); |
582 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); |
583 | } |
584 | |
585 | static ssize_t |
586 | card_id_store_attr(struct device *dev, struct device_attribute *attr, |
587 | const char *buf, size_t count) |
588 | { |
589 | struct snd_card *card = dev_get_drvdata(dev); |
590 | char buf1[sizeof(card->id)]; |
591 | size_t copy = count > sizeof(card->id) - 1 ? |
592 | sizeof(card->id) - 1 : count; |
593 | size_t idx; |
594 | int c; |
595 | |
596 | for (idx = 0; idx < copy; idx++) { |
597 | c = buf[idx]; |
598 | if (!isalnum(c) && c != '_' && c != '-') |
599 | return -EINVAL; |
600 | } |
601 | memcpy(buf1, buf, copy); |
602 | buf1[copy] = '\0'; |
603 | mutex_lock(&snd_card_mutex); |
604 | if (!snd_info_check_reserved_words(buf1)) { |
605 | __exist: |
606 | mutex_unlock(&snd_card_mutex); |
607 | return -EEXIST; |
608 | } |
609 | for (idx = 0; idx < snd_ecards_limit; idx++) { |
610 | if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) |
611 | goto __exist; |
612 | } |
613 | strcpy(card->id, buf1); |
614 | snd_info_card_id_change(card); |
615 | mutex_unlock(&snd_card_mutex); |
616 | |
617 | return count; |
618 | } |
619 | |
620 | static struct device_attribute card_id_attrs = |
621 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); |
622 | |
623 | static ssize_t |
624 | card_number_show_attr(struct device *dev, |
625 | struct device_attribute *attr, char *buf) |
626 | { |
627 | struct snd_card *card = dev_get_drvdata(dev); |
628 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); |
629 | } |
630 | |
631 | static struct device_attribute card_number_attrs = |
632 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); |
633 | #endif /* CONFIG_SYSFS_DEPRECATED */ |
634 | |
635 | /** |
636 | * snd_card_register - register the soundcard |
637 | * @card: soundcard structure |
638 | * |
639 | * This function registers all the devices assigned to the soundcard. |
640 | * Until calling this, the ALSA control interface is blocked from the |
641 | * external accesses. Thus, you should call this function at the end |
642 | * of the initialization of the card. |
643 | * |
644 | * Returns zero otherwise a negative error code if the registrain failed. |
645 | */ |
646 | int snd_card_register(struct snd_card *card) |
647 | { |
648 | int err; |
649 | |
650 | if (snd_BUG_ON(!card)) |
651 | return -EINVAL; |
652 | #ifndef CONFIG_SYSFS_DEPRECATED |
653 | if (!card->card_dev) { |
654 | card->card_dev = device_create(sound_class, card->dev, |
655 | MKDEV(0, 0), card, |
656 | "card%i", card->number); |
657 | if (IS_ERR(card->card_dev)) |
658 | card->card_dev = NULL; |
659 | } |
660 | #endif |
661 | if ((err = snd_device_register_all(card)) < 0) |
662 | return err; |
663 | mutex_lock(&snd_card_mutex); |
664 | if (snd_cards[card->number]) { |
665 | /* already registered */ |
666 | mutex_unlock(&snd_card_mutex); |
667 | return 0; |
668 | } |
669 | snd_card_set_id_no_lock(card, card->id[0] == '\0' ? NULL : card->id); |
670 | snd_cards[card->number] = card; |
671 | mutex_unlock(&snd_card_mutex); |
672 | init_info_for_card(card); |
673 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
674 | if (snd_mixer_oss_notify_callback) |
675 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); |
676 | #endif |
677 | #ifndef CONFIG_SYSFS_DEPRECATED |
678 | if (card->card_dev) { |
679 | err = device_create_file(card->card_dev, &card_id_attrs); |
680 | if (err < 0) |
681 | return err; |
682 | err = device_create_file(card->card_dev, &card_number_attrs); |
683 | if (err < 0) |
684 | return err; |
685 | } |
686 | #endif |
687 | return 0; |
688 | } |
689 | |
690 | EXPORT_SYMBOL(snd_card_register); |
691 | |
692 | #ifdef CONFIG_PROC_FS |
693 | static struct snd_info_entry *snd_card_info_entry; |
694 | |
695 | static void snd_card_info_read(struct snd_info_entry *entry, |
696 | struct snd_info_buffer *buffer) |
697 | { |
698 | int idx, count; |
699 | struct snd_card *card; |
700 | |
701 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { |
702 | mutex_lock(&snd_card_mutex); |
703 | if ((card = snd_cards[idx]) != NULL) { |
704 | count++; |
705 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
706 | idx, |
707 | card->id, |
708 | card->driver, |
709 | card->shortname); |
710 | snd_iprintf(buffer, " %s\n", |
711 | card->longname); |
712 | } |
713 | mutex_unlock(&snd_card_mutex); |
714 | } |
715 | if (!count) |
716 | snd_iprintf(buffer, "--- no soundcards ---\n"); |
717 | } |
718 | |
719 | #ifdef CONFIG_SND_OSSEMUL |
720 | |
721 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
722 | { |
723 | int idx, count; |
724 | struct snd_card *card; |
725 | |
726 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { |
727 | mutex_lock(&snd_card_mutex); |
728 | if ((card = snd_cards[idx]) != NULL) { |
729 | count++; |
730 | snd_iprintf(buffer, "%s\n", card->longname); |
731 | } |
732 | mutex_unlock(&snd_card_mutex); |
733 | } |
734 | if (!count) { |
735 | snd_iprintf(buffer, "--- no soundcards ---\n"); |
736 | } |
737 | } |
738 | |
739 | #endif |
740 | |
741 | #ifdef MODULE |
742 | static struct snd_info_entry *snd_card_module_info_entry; |
743 | static void snd_card_module_info_read(struct snd_info_entry *entry, |
744 | struct snd_info_buffer *buffer) |
745 | { |
746 | int idx; |
747 | struct snd_card *card; |
748 | |
749 | for (idx = 0; idx < SNDRV_CARDS; idx++) { |
750 | mutex_lock(&snd_card_mutex); |
751 | if ((card = snd_cards[idx]) != NULL) |
752 | snd_iprintf(buffer, "%2i %s\n", |
753 | idx, card->module->name); |
754 | mutex_unlock(&snd_card_mutex); |
755 | } |
756 | } |
757 | #endif |
758 | |
759 | int __init snd_card_info_init(void) |
760 | { |
761 | struct snd_info_entry *entry; |
762 | |
763 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); |
764 | if (! entry) |
765 | return -ENOMEM; |
766 | entry->c.text.read = snd_card_info_read; |
767 | if (snd_info_register(entry) < 0) { |
768 | snd_info_free_entry(entry); |
769 | return -ENOMEM; |
770 | } |
771 | snd_card_info_entry = entry; |
772 | |
773 | #ifdef MODULE |
774 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); |
775 | if (entry) { |
776 | entry->c.text.read = snd_card_module_info_read; |
777 | if (snd_info_register(entry) < 0) |
778 | snd_info_free_entry(entry); |
779 | else |
780 | snd_card_module_info_entry = entry; |
781 | } |
782 | #endif |
783 | |
784 | return 0; |
785 | } |
786 | |
787 | int __exit snd_card_info_done(void) |
788 | { |
789 | snd_info_free_entry(snd_card_info_entry); |
790 | #ifdef MODULE |
791 | snd_info_free_entry(snd_card_module_info_entry); |
792 | #endif |
793 | return 0; |
794 | } |
795 | |
796 | #endif /* CONFIG_PROC_FS */ |
797 | |
798 | /** |
799 | * snd_component_add - add a component string |
800 | * @card: soundcard structure |
801 | * @component: the component id string |
802 | * |
803 | * This function adds the component id string to the supported list. |
804 | * The component can be referred from the alsa-lib. |
805 | * |
806 | * Returns zero otherwise a negative error code. |
807 | */ |
808 | |
809 | int snd_component_add(struct snd_card *card, const char *component) |
810 | { |
811 | char *ptr; |
812 | int len = strlen(component); |
813 | |
814 | ptr = strstr(card->components, component); |
815 | if (ptr != NULL) { |
816 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ |
817 | return 1; |
818 | } |
819 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { |
820 | snd_BUG(); |
821 | return -ENOMEM; |
822 | } |
823 | if (card->components[0] != '\0') |
824 | strcat(card->components, " "); |
825 | strcat(card->components, component); |
826 | return 0; |
827 | } |
828 | |
829 | EXPORT_SYMBOL(snd_component_add); |
830 | |
831 | /** |
832 | * snd_card_file_add - add the file to the file list of the card |
833 | * @card: soundcard structure |
834 | * @file: file pointer |
835 | * |
836 | * This function adds the file to the file linked-list of the card. |
837 | * This linked-list is used to keep tracking the connection state, |
838 | * and to avoid the release of busy resources by hotplug. |
839 | * |
840 | * Returns zero or a negative error code. |
841 | */ |
842 | int snd_card_file_add(struct snd_card *card, struct file *file) |
843 | { |
844 | struct snd_monitor_file *mfile; |
845 | |
846 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); |
847 | if (mfile == NULL) |
848 | return -ENOMEM; |
849 | mfile->file = file; |
850 | mfile->disconnected_f_op = NULL; |
851 | spin_lock(&card->files_lock); |
852 | if (card->shutdown) { |
853 | spin_unlock(&card->files_lock); |
854 | kfree(mfile); |
855 | return -ENODEV; |
856 | } |
857 | list_add(&mfile->list, &card->files_list); |
858 | spin_unlock(&card->files_lock); |
859 | return 0; |
860 | } |
861 | |
862 | EXPORT_SYMBOL(snd_card_file_add); |
863 | |
864 | /** |
865 | * snd_card_file_remove - remove the file from the file list |
866 | * @card: soundcard structure |
867 | * @file: file pointer |
868 | * |
869 | * This function removes the file formerly added to the card via |
870 | * snd_card_file_add() function. |
871 | * If all files are removed and snd_card_free_when_closed() was |
872 | * called beforehand, it processes the pending release of |
873 | * resources. |
874 | * |
875 | * Returns zero or a negative error code. |
876 | */ |
877 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
878 | { |
879 | struct snd_monitor_file *mfile, *found = NULL; |
880 | int last_close = 0; |
881 | |
882 | spin_lock(&card->files_lock); |
883 | list_for_each_entry(mfile, &card->files_list, list) { |
884 | if (mfile->file == file) { |
885 | list_del(&mfile->list); |
886 | if (mfile->disconnected_f_op) |
887 | fops_put(mfile->disconnected_f_op); |
888 | found = mfile; |
889 | break; |
890 | } |
891 | } |
892 | if (list_empty(&card->files_list)) |
893 | last_close = 1; |
894 | spin_unlock(&card->files_lock); |
895 | if (last_close) { |
896 | wake_up(&card->shutdown_sleep); |
897 | if (card->free_on_last_close) |
898 | snd_card_do_free(card); |
899 | } |
900 | if (!found) { |
901 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
902 | return -ENOENT; |
903 | } |
904 | kfree(found); |
905 | return 0; |
906 | } |
907 | |
908 | EXPORT_SYMBOL(snd_card_file_remove); |
909 | |
910 | #ifdef CONFIG_PM |
911 | /** |
912 | * snd_power_wait - wait until the power-state is changed. |
913 | * @card: soundcard structure |
914 | * @power_state: expected power state |
915 | * |
916 | * Waits until the power-state is changed. |
917 | * |
918 | * Note: the power lock must be active before call. |
919 | */ |
920 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
921 | { |
922 | wait_queue_t wait; |
923 | int result = 0; |
924 | |
925 | /* fastpath */ |
926 | if (snd_power_get_state(card) == power_state) |
927 | return 0; |
928 | init_waitqueue_entry(&wait, current); |
929 | add_wait_queue(&card->power_sleep, &wait); |
930 | while (1) { |
931 | if (card->shutdown) { |
932 | result = -ENODEV; |
933 | break; |
934 | } |
935 | if (snd_power_get_state(card) == power_state) |
936 | break; |
937 | set_current_state(TASK_UNINTERRUPTIBLE); |
938 | snd_power_unlock(card); |
939 | schedule_timeout(30 * HZ); |
940 | snd_power_lock(card); |
941 | } |
942 | remove_wait_queue(&card->power_sleep, &wait); |
943 | return result; |
944 | } |
945 | |
946 | EXPORT_SYMBOL(snd_power_wait); |
947 | #endif /* CONFIG_PM */ |
948 |
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