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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 | ||
a93bbaa7 | 49 | /* return non-zero if the given index is reserved for the given |
304cd07f TI |
50 | * module via slots option |
51 | */ | |
a93bbaa7 | 52 | static int module_slot_match(struct module *module, int idx) |
304cd07f | 53 | { |
a93bbaa7 | 54 | int match = 1; |
304cd07f | 55 | #ifdef MODULE |
a93bbaa7 TI |
56 | const char *s1, *s2; |
57 | ||
304cd07f TI |
58 | if (!module || !module->name || !slots[idx]) |
59 | return 0; | |
a93bbaa7 TI |
60 | |
61 | s1 = module->name; | |
62 | s2 = slots[idx]; | |
63 | if (*s2 == '!') { | |
64 | match = 0; /* negative match */ | |
65 | s2++; | |
66 | } | |
304cd07f TI |
67 | /* compare module name strings |
68 | * hyphens are handled as equivalent with underscore | |
69 | */ | |
70 | for (;;) { | |
71 | char c1 = *s1++; | |
72 | char c2 = *s2++; | |
73 | if (c1 == '-') | |
74 | c1 = '_'; | |
75 | if (c2 == '-') | |
76 | c2 = '_'; | |
77 | if (c1 != c2) | |
a93bbaa7 | 78 | return !match; |
304cd07f TI |
79 | if (!c1) |
80 | break; | |
81 | } | |
a93bbaa7 TI |
82 | #endif /* MODULE */ |
83 | return match; | |
304cd07f TI |
84 | } |
85 | ||
1da177e4 | 86 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
512bbd6a | 87 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
c0d3fb39 | 88 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
89 | #endif |
90 | ||
e28563cc | 91 | #ifdef CONFIG_PROC_FS |
512bbd6a TI |
92 | static void snd_card_id_read(struct snd_info_entry *entry, |
93 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
94 | { |
95 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
96 | } | |
97 | ||
e28563cc TI |
98 | static inline int init_info_for_card(struct snd_card *card) |
99 | { | |
100 | int err; | |
101 | struct snd_info_entry *entry; | |
102 | ||
103 | if ((err = snd_info_card_register(card)) < 0) { | |
104 | snd_printd("unable to create card info\n"); | |
105 | return err; | |
106 | } | |
107 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
108 | snd_printd("unable to create card entry\n"); | |
109 | return err; | |
110 | } | |
e28563cc TI |
111 | entry->c.text.read = snd_card_id_read; |
112 | if (snd_info_register(entry) < 0) { | |
113 | snd_info_free_entry(entry); | |
114 | entry = NULL; | |
115 | } | |
116 | card->proc_id = entry; | |
117 | return 0; | |
118 | } | |
119 | #else /* !CONFIG_PROC_FS */ | |
120 | #define init_info_for_card(card) | |
121 | #endif | |
122 | ||
1da177e4 LT |
123 | /** |
124 | * snd_card_new - create and initialize a soundcard structure | |
125 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] | |
126 | * @xid: card identification (ASCII string) | |
127 | * @module: top level module for locking | |
128 | * @extra_size: allocate this extra size after the main soundcard structure | |
129 | * | |
130 | * Creates and initializes a soundcard structure. | |
131 | * | |
512bbd6a | 132 | * Returns kmallocated snd_card structure. Creates the ALSA control interface |
1da177e4 LT |
133 | * (which is blocked until snd_card_register function is called). |
134 | */ | |
512bbd6a | 135 | struct snd_card *snd_card_new(int idx, const char *xid, |
1da177e4 LT |
136 | struct module *module, int extra_size) |
137 | { | |
512bbd6a | 138 | struct snd_card *card; |
a93bbaa7 | 139 | int err, idx2; |
1da177e4 LT |
140 | |
141 | if (extra_size < 0) | |
142 | extra_size = 0; | |
ca2c0966 | 143 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
1da177e4 LT |
144 | if (card == NULL) |
145 | return NULL; | |
146 | if (xid) { | |
147 | if (!snd_info_check_reserved_words(xid)) | |
148 | goto __error; | |
149 | strlcpy(card->id, xid, sizeof(card->id)); | |
150 | } | |
151 | err = 0; | |
746df948 | 152 | mutex_lock(&snd_card_mutex); |
1da177e4 | 153 | if (idx < 0) { |
1da177e4 | 154 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
5c33dd70 | 155 | /* idx == -1 == 0xffff means: take any free slot */ |
1da177e4 | 156 | if (~snd_cards_lock & idx & 1<<idx2) { |
a93bbaa7 TI |
157 | if (module_slot_match(module, idx2)) { |
158 | idx = idx2; | |
159 | break; | |
160 | } | |
161 | } | |
162 | } | |
163 | if (idx < 0) { | |
164 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
165 | /* idx == -1 == 0xffff means: take any free slot */ | |
166 | if (~snd_cards_lock & idx & 1<<idx2) { | |
167 | if (!slots[idx2] || !*slots[idx2]) { | |
168 | idx = idx2; | |
169 | break; | |
170 | } | |
1da177e4 | 171 | } |
5c33dd70 | 172 | } |
a93bbaa7 TI |
173 | if (idx < 0) |
174 | err = -ENODEV; | |
175 | else if (idx < snd_ecards_limit) { | |
176 | if (snd_cards_lock & (1 << idx)) | |
177 | err = -EBUSY; /* invalid */ | |
178 | } else if (idx >= SNDRV_CARDS) | |
179 | err = -ENODEV; | |
180 | if (err < 0) { | |
746df948 | 181 | mutex_unlock(&snd_card_mutex); |
5c33dd70 ON |
182 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
183 | idx, snd_ecards_limit - 1, err); | |
1da177e4 LT |
184 | goto __error; |
185 | } | |
186 | snd_cards_lock |= 1 << idx; /* lock it */ | |
a93bbaa7 TI |
187 | if (idx >= snd_ecards_limit) |
188 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
746df948 | 189 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
190 | card->number = idx; |
191 | card->module = module; | |
192 | INIT_LIST_HEAD(&card->devices); | |
193 | init_rwsem(&card->controls_rwsem); | |
194 | rwlock_init(&card->ctl_files_rwlock); | |
195 | INIT_LIST_HEAD(&card->controls); | |
196 | INIT_LIST_HEAD(&card->ctl_files); | |
197 | spin_lock_init(&card->files_lock); | |
198 | init_waitqueue_head(&card->shutdown_sleep); | |
1da177e4 | 199 | #ifdef CONFIG_PM |
1a60d4c5 | 200 | mutex_init(&card->power_lock); |
1da177e4 LT |
201 | init_waitqueue_head(&card->power_sleep); |
202 | #endif | |
203 | /* the control interface cannot be accessed from the user space until */ | |
204 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
205 | if ((err = snd_ctl_create(card)) < 0) { | |
206 | snd_printd("unable to register control minors\n"); | |
207 | goto __error; | |
208 | } | |
209 | if ((err = snd_info_card_create(card)) < 0) { | |
210 | snd_printd("unable to create card info\n"); | |
211 | goto __error_ctl; | |
212 | } | |
213 | if (extra_size > 0) | |
512bbd6a | 214 | card->private_data = (char *)card + sizeof(struct snd_card); |
1da177e4 LT |
215 | return card; |
216 | ||
217 | __error_ctl: | |
218 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
219 | __error: | |
220 | kfree(card); | |
221 | return NULL; | |
222 | } | |
223 | ||
c0d3fb39 TI |
224 | EXPORT_SYMBOL(snd_card_new); |
225 | ||
746df948 TI |
226 | /* return non-zero if a card is already locked */ |
227 | int snd_card_locked(int card) | |
228 | { | |
229 | int locked; | |
230 | ||
231 | mutex_lock(&snd_card_mutex); | |
232 | locked = snd_cards_lock & (1 << card); | |
233 | mutex_unlock(&snd_card_mutex); | |
234 | return locked; | |
235 | } | |
236 | ||
b3b0abe1 CL |
237 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
238 | { | |
239 | return -ENODEV; | |
240 | } | |
241 | ||
242 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
243 | size_t count, loff_t *offset) | |
244 | { | |
245 | return -ENODEV; | |
246 | } | |
247 | ||
248 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
249 | size_t count, loff_t *offset) | |
250 | { | |
251 | return -ENODEV; | |
252 | } | |
253 | ||
a9edfc60 KW |
254 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
255 | { | |
256 | struct snd_monitor_file *df = NULL, *_df; | |
257 | ||
258 | spin_lock(&shutdown_lock); | |
259 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
260 | if (_df->file == file) { | |
261 | df = _df; | |
262 | break; | |
263 | } | |
264 | } | |
265 | spin_unlock(&shutdown_lock); | |
266 | ||
233e70f4 AV |
267 | if (likely(df)) { |
268 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
269 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 270 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 271 | } |
a9edfc60 | 272 | |
9bf8e7dd | 273 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
274 | } |
275 | ||
1da177e4 LT |
276 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
277 | { | |
278 | return POLLERR | POLLNVAL; | |
279 | } | |
280 | ||
b3b0abe1 CL |
281 | static long snd_disconnect_ioctl(struct file *file, |
282 | unsigned int cmd, unsigned long arg) | |
283 | { | |
284 | return -ENODEV; | |
285 | } | |
286 | ||
287 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
288 | { | |
289 | return -ENODEV; | |
290 | } | |
291 | ||
292 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
293 | { | |
294 | return -ENODEV; | |
295 | } | |
296 | ||
9c2e08c5 | 297 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
298 | { |
299 | .owner = THIS_MODULE, | |
300 | .llseek = snd_disconnect_llseek, | |
301 | .read = snd_disconnect_read, | |
302 | .write = snd_disconnect_write, | |
303 | .release = snd_disconnect_release, | |
304 | .poll = snd_disconnect_poll, | |
305 | .unlocked_ioctl = snd_disconnect_ioctl, | |
306 | #ifdef CONFIG_COMPAT | |
307 | .compat_ioctl = snd_disconnect_ioctl, | |
308 | #endif | |
309 | .mmap = snd_disconnect_mmap, | |
310 | .fasync = snd_disconnect_fasync | |
311 | }; | |
312 | ||
1da177e4 LT |
313 | /** |
314 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
315 | * @card: soundcard structure | |
316 | * | |
317 | * Disconnects all APIs from the file-operations (user space). | |
318 | * | |
319 | * Returns zero, otherwise a negative error code. | |
320 | * | |
321 | * Note: The current implementation replaces all active file->f_op with special | |
322 | * dummy file operations (they do nothing except release). | |
323 | */ | |
512bbd6a | 324 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
325 | { |
326 | struct snd_monitor_file *mfile; | |
327 | struct file *file; | |
1da177e4 LT |
328 | int err; |
329 | ||
f18638dc TI |
330 | if (!card) |
331 | return -EINVAL; | |
332 | ||
1da177e4 LT |
333 | spin_lock(&card->files_lock); |
334 | if (card->shutdown) { | |
335 | spin_unlock(&card->files_lock); | |
336 | return 0; | |
337 | } | |
338 | card->shutdown = 1; | |
339 | spin_unlock(&card->files_lock); | |
340 | ||
341 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 342 | mutex_lock(&snd_card_mutex); |
1da177e4 | 343 | snd_cards[card->number] = NULL; |
f18638dc | 344 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 345 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
346 | |
347 | /* phase 2: replace file->f_op with special dummy operations */ | |
348 | ||
349 | spin_lock(&card->files_lock); | |
350 | mfile = card->files; | |
351 | while (mfile) { | |
352 | file = mfile->file; | |
353 | ||
354 | /* it's critical part, use endless loop */ | |
355 | /* we have no room to fail */ | |
a9edfc60 | 356 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 357 | |
a9edfc60 KW |
358 | spin_lock(&shutdown_lock); |
359 | list_add(&mfile->shutdown_list, &shutdown_files); | |
360 | spin_unlock(&shutdown_lock); | |
1da177e4 | 361 | |
a9edfc60 | 362 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 363 | fops_get(mfile->file->f_op); |
1da177e4 LT |
364 | |
365 | mfile = mfile->next; | |
366 | } | |
367 | spin_unlock(&card->files_lock); | |
368 | ||
369 | /* phase 3: notify all connected devices about disconnection */ | |
370 | /* at this point, they cannot respond to any calls except release() */ | |
371 | ||
372 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
373 | if (snd_mixer_oss_notify_callback) | |
374 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
375 | #endif | |
376 | ||
377 | /* notify all devices that we are disconnected */ | |
378 | err = snd_device_disconnect_all(card); | |
379 | if (err < 0) | |
380 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
381 | ||
746d4a02 | 382 | snd_info_card_disconnect(card); |
73d38b13 TI |
383 | #ifndef CONFIG_SYSFS_DEPRECATED |
384 | if (card->card_dev) { | |
385 | device_unregister(card->card_dev); | |
386 | card->card_dev = NULL; | |
387 | } | |
f18638dc TI |
388 | #endif |
389 | #ifdef CONFIG_PM | |
390 | wake_up(&card->power_sleep); | |
73d38b13 | 391 | #endif |
1da177e4 LT |
392 | return 0; |
393 | } | |
394 | ||
c0d3fb39 TI |
395 | EXPORT_SYMBOL(snd_card_disconnect); |
396 | ||
1da177e4 LT |
397 | /** |
398 | * snd_card_free - frees given soundcard structure | |
399 | * @card: soundcard structure | |
400 | * | |
401 | * This function releases the soundcard structure and the all assigned | |
402 | * devices automatically. That is, you don't have to release the devices | |
403 | * by yourself. | |
404 | * | |
405 | * Returns zero. Frees all associated devices and frees the control | |
406 | * interface associated to given soundcard. | |
407 | */ | |
c461482c | 408 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 409 | { |
1da177e4 LT |
410 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
411 | if (snd_mixer_oss_notify_callback) | |
412 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
413 | #endif | |
414 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
415 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
416 | /* Fatal, but this situation should never occur */ | |
417 | } | |
418 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
419 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
420 | /* Fatal, but this situation should never occur */ | |
421 | } | |
422 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
423 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
424 | /* Fatal, but this situation should never occur */ | |
425 | } | |
426 | if (card->private_free) | |
427 | card->private_free(card); | |
746d4a02 | 428 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
429 | if (snd_info_card_free(card) < 0) { |
430 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
431 | /* Not fatal error */ | |
432 | } | |
c461482c TI |
433 | kfree(card); |
434 | return 0; | |
435 | } | |
436 | ||
c461482c TI |
437 | int snd_card_free_when_closed(struct snd_card *card) |
438 | { | |
439 | int free_now = 0; | |
f18638dc | 440 | int ret = snd_card_disconnect(card); |
c461482c TI |
441 | if (ret) |
442 | return ret; | |
443 | ||
444 | spin_lock(&card->files_lock); | |
445 | if (card->files == NULL) | |
446 | free_now = 1; | |
447 | else | |
448 | card->free_on_last_close = 1; | |
449 | spin_unlock(&card->files_lock); | |
450 | ||
451 | if (free_now) | |
452 | snd_card_do_free(card); | |
453 | return 0; | |
454 | } | |
455 | ||
456 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
457 | ||
458 | int snd_card_free(struct snd_card *card) | |
459 | { | |
f18638dc | 460 | int ret = snd_card_disconnect(card); |
c461482c TI |
461 | if (ret) |
462 | return ret; | |
463 | ||
464 | /* wait, until all devices are ready for the free operation */ | |
465 | wait_event(card->shutdown_sleep, card->files == NULL); | |
466 | snd_card_do_free(card); | |
1da177e4 LT |
467 | return 0; |
468 | } | |
469 | ||
c0d3fb39 TI |
470 | EXPORT_SYMBOL(snd_card_free); |
471 | ||
512bbd6a | 472 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 473 | { |
d001544d | 474 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
475 | char *id, *spos; |
476 | ||
477 | id = spos = card->shortname; | |
478 | while (*id != '\0') { | |
479 | if (*id == ' ') | |
480 | spos = id + 1; | |
481 | id++; | |
482 | } | |
483 | id = card->id; | |
484 | while (*spos != '\0' && !isalnum(*spos)) | |
485 | spos++; | |
486 | if (isdigit(*spos)) | |
487 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
488 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
489 | if (isalnum(*spos)) | |
490 | *id++ = *spos; | |
491 | spos++; | |
492 | } | |
493 | *id = '\0'; | |
494 | ||
495 | id = card->id; | |
496 | ||
497 | if (*id == '\0') | |
498 | strcpy(id, "default"); | |
499 | ||
500 | while (1) { | |
501 | if (loops-- == 0) { | |
502 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
503 | strcpy(card->id, card->proc_root->name); | |
504 | return; | |
505 | } | |
506 | if (!snd_info_check_reserved_words(id)) | |
507 | goto __change; | |
508 | for (i = 0; i < snd_ecards_limit; i++) { | |
509 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
510 | goto __change; | |
511 | } | |
512 | break; | |
513 | ||
514 | __change: | |
515 | len = strlen(id); | |
d001544d CL |
516 | if (idx_flag) { |
517 | if (id[len-1] != '9') | |
518 | id[len-1]++; | |
519 | else | |
520 | id[len-1] = 'A'; | |
521 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
522 | strcat(id, "_1"); |
523 | idx_flag++; | |
524 | } else { | |
525 | spos = id + len - 2; | |
526 | if ((size_t)len <= sizeof(card->id) - 2) | |
527 | spos++; | |
528 | *spos++ = '_'; | |
529 | *spos++ = '1'; | |
530 | *spos++ = '\0'; | |
531 | idx_flag++; | |
532 | } | |
533 | } | |
534 | } | |
535 | ||
9fb6198e JK |
536 | #ifndef CONFIG_SYSFS_DEPRECATED |
537 | static ssize_t | |
538 | card_id_show_attr(struct device *dev, | |
539 | struct device_attribute *attr, char *buf) | |
540 | { | |
541 | struct snd_card *card = dev_get_drvdata(dev); | |
542 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); | |
543 | } | |
544 | ||
545 | static ssize_t | |
546 | card_id_store_attr(struct device *dev, struct device_attribute *attr, | |
547 | const char *buf, size_t count) | |
548 | { | |
549 | struct snd_card *card = dev_get_drvdata(dev); | |
550 | char buf1[sizeof(card->id)]; | |
551 | size_t copy = count > sizeof(card->id) - 1 ? | |
552 | sizeof(card->id) - 1 : count; | |
553 | size_t idx; | |
554 | int c; | |
555 | ||
556 | for (idx = 0; idx < copy; idx++) { | |
557 | c = buf[idx]; | |
558 | if (!isalnum(c) && c != '_' && c != '-') | |
559 | return -EINVAL; | |
560 | } | |
561 | memcpy(buf1, buf, copy); | |
562 | buf1[copy] = '\0'; | |
563 | mutex_lock(&snd_card_mutex); | |
564 | if (!snd_info_check_reserved_words(buf1)) { | |
565 | __exist: | |
566 | mutex_unlock(&snd_card_mutex); | |
567 | return -EEXIST; | |
568 | } | |
569 | for (idx = 0; idx < snd_ecards_limit; idx++) { | |
570 | if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) | |
571 | goto __exist; | |
572 | } | |
573 | strcpy(card->id, buf1); | |
c2eb9c4e | 574 | snd_info_card_id_change(card); |
9fb6198e JK |
575 | mutex_unlock(&snd_card_mutex); |
576 | ||
577 | return count; | |
578 | } | |
579 | ||
580 | static struct device_attribute card_id_attrs = | |
581 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); | |
582 | ||
583 | static ssize_t | |
584 | card_number_show_attr(struct device *dev, | |
585 | struct device_attribute *attr, char *buf) | |
586 | { | |
587 | struct snd_card *card = dev_get_drvdata(dev); | |
588 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); | |
589 | } | |
590 | ||
591 | static struct device_attribute card_number_attrs = | |
592 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); | |
593 | #endif /* CONFIG_SYSFS_DEPRECATED */ | |
594 | ||
1da177e4 LT |
595 | /** |
596 | * snd_card_register - register the soundcard | |
597 | * @card: soundcard structure | |
598 | * | |
599 | * This function registers all the devices assigned to the soundcard. | |
600 | * Until calling this, the ALSA control interface is blocked from the | |
601 | * external accesses. Thus, you should call this function at the end | |
602 | * of the initialization of the card. | |
603 | * | |
604 | * Returns zero otherwise a negative error code if the registrain failed. | |
605 | */ | |
512bbd6a | 606 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
607 | { |
608 | int err; | |
1da177e4 | 609 | |
7eaa943c TI |
610 | if (snd_BUG_ON(!card)) |
611 | return -EINVAL; | |
7d2aae1e TI |
612 | #ifndef CONFIG_SYSFS_DEPRECATED |
613 | if (!card->card_dev) { | |
abe9ab8f | 614 | card->card_dev = device_create(sound_class, card->dev, |
9fb6198e | 615 | MKDEV(0, 0), card, |
abe9ab8f | 616 | "card%i", card->number); |
7d2aae1e TI |
617 | if (IS_ERR(card->card_dev)) |
618 | card->card_dev = NULL; | |
d80f19fa | 619 | } |
7d2aae1e | 620 | #endif |
1da177e4 LT |
621 | if ((err = snd_device_register_all(card)) < 0) |
622 | return err; | |
746df948 | 623 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
624 | if (snd_cards[card->number]) { |
625 | /* already registered */ | |
746df948 | 626 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
627 | return 0; |
628 | } | |
629 | if (card->id[0] == '\0') | |
630 | choose_default_id(card); | |
631 | snd_cards[card->number] = card; | |
746df948 | 632 | mutex_unlock(&snd_card_mutex); |
e28563cc | 633 | init_info_for_card(card); |
1da177e4 LT |
634 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
635 | if (snd_mixer_oss_notify_callback) | |
636 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e JK |
637 | #endif |
638 | #ifndef CONFIG_SYSFS_DEPRECATED | |
639 | if (card->card_dev) { | |
2af75293 HE |
640 | err = device_create_file(card->card_dev, &card_id_attrs); |
641 | if (err < 0) | |
642 | return err; | |
643 | err = device_create_file(card->card_dev, &card_number_attrs); | |
644 | if (err < 0) | |
645 | return err; | |
9fb6198e | 646 | } |
1da177e4 LT |
647 | #endif |
648 | return 0; | |
649 | } | |
650 | ||
c0d3fb39 TI |
651 | EXPORT_SYMBOL(snd_card_register); |
652 | ||
e28563cc | 653 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 654 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 655 | |
a381a7a6 TI |
656 | static void snd_card_info_read(struct snd_info_entry *entry, |
657 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
658 | { |
659 | int idx, count; | |
512bbd6a | 660 | struct snd_card *card; |
1da177e4 LT |
661 | |
662 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 663 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
664 | if ((card = snd_cards[idx]) != NULL) { |
665 | count++; | |
d001544d | 666 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
667 | idx, |
668 | card->id, | |
669 | card->driver, | |
670 | card->shortname); | |
d001544d | 671 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
672 | card->longname); |
673 | } | |
746df948 | 674 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
675 | } |
676 | if (!count) | |
677 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
678 | } | |
679 | ||
e28563cc | 680 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 681 | |
512bbd6a | 682 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
683 | { |
684 | int idx, count; | |
512bbd6a | 685 | struct snd_card *card; |
1da177e4 LT |
686 | |
687 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 688 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
689 | if ((card = snd_cards[idx]) != NULL) { |
690 | count++; | |
691 | snd_iprintf(buffer, "%s\n", card->longname); | |
692 | } | |
746df948 | 693 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
694 | } |
695 | if (!count) { | |
696 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
697 | } | |
698 | } | |
699 | ||
700 | #endif | |
701 | ||
702 | #ifdef MODULE | |
512bbd6a TI |
703 | static struct snd_info_entry *snd_card_module_info_entry; |
704 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
705 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
706 | { |
707 | int idx; | |
512bbd6a | 708 | struct snd_card *card; |
1da177e4 LT |
709 | |
710 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 711 | mutex_lock(&snd_card_mutex); |
1da177e4 | 712 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
713 | snd_iprintf(buffer, "%2i %s\n", |
714 | idx, card->module->name); | |
746df948 | 715 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
716 | } |
717 | } | |
718 | #endif | |
719 | ||
720 | int __init snd_card_info_init(void) | |
721 | { | |
512bbd6a | 722 | struct snd_info_entry *entry; |
1da177e4 LT |
723 | |
724 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
725 | if (! entry) |
726 | return -ENOMEM; | |
1da177e4 LT |
727 | entry->c.text.read = snd_card_info_read; |
728 | if (snd_info_register(entry) < 0) { | |
729 | snd_info_free_entry(entry); | |
730 | return -ENOMEM; | |
731 | } | |
732 | snd_card_info_entry = entry; | |
733 | ||
734 | #ifdef MODULE | |
735 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
736 | if (entry) { | |
1da177e4 LT |
737 | entry->c.text.read = snd_card_module_info_read; |
738 | if (snd_info_register(entry) < 0) | |
739 | snd_info_free_entry(entry); | |
740 | else | |
741 | snd_card_module_info_entry = entry; | |
742 | } | |
743 | #endif | |
744 | ||
745 | return 0; | |
746 | } | |
747 | ||
748 | int __exit snd_card_info_done(void) | |
749 | { | |
746d4a02 | 750 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 751 | #ifdef MODULE |
746d4a02 | 752 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
753 | #endif |
754 | return 0; | |
755 | } | |
756 | ||
e28563cc TI |
757 | #endif /* CONFIG_PROC_FS */ |
758 | ||
1da177e4 LT |
759 | /** |
760 | * snd_component_add - add a component string | |
761 | * @card: soundcard structure | |
762 | * @component: the component id string | |
763 | * | |
764 | * This function adds the component id string to the supported list. | |
765 | * The component can be referred from the alsa-lib. | |
766 | * | |
767 | * Returns zero otherwise a negative error code. | |
768 | */ | |
769 | ||
512bbd6a | 770 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
771 | { |
772 | char *ptr; | |
773 | int len = strlen(component); | |
774 | ||
775 | ptr = strstr(card->components, component); | |
776 | if (ptr != NULL) { | |
777 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
778 | return 1; | |
779 | } | |
780 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
781 | snd_BUG(); | |
782 | return -ENOMEM; | |
783 | } | |
784 | if (card->components[0] != '\0') | |
785 | strcat(card->components, " "); | |
786 | strcat(card->components, component); | |
787 | return 0; | |
788 | } | |
789 | ||
c0d3fb39 TI |
790 | EXPORT_SYMBOL(snd_component_add); |
791 | ||
1da177e4 LT |
792 | /** |
793 | * snd_card_file_add - add the file to the file list of the card | |
794 | * @card: soundcard structure | |
795 | * @file: file pointer | |
796 | * | |
797 | * This function adds the file to the file linked-list of the card. | |
798 | * This linked-list is used to keep tracking the connection state, | |
799 | * and to avoid the release of busy resources by hotplug. | |
800 | * | |
801 | * Returns zero or a negative error code. | |
802 | */ | |
512bbd6a | 803 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
804 | { |
805 | struct snd_monitor_file *mfile; | |
806 | ||
807 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
808 | if (mfile == NULL) | |
809 | return -ENOMEM; | |
810 | mfile->file = file; | |
a9edfc60 | 811 | mfile->disconnected_f_op = NULL; |
1da177e4 LT |
812 | mfile->next = NULL; |
813 | spin_lock(&card->files_lock); | |
814 | if (card->shutdown) { | |
815 | spin_unlock(&card->files_lock); | |
816 | kfree(mfile); | |
817 | return -ENODEV; | |
818 | } | |
819 | mfile->next = card->files; | |
820 | card->files = mfile; | |
821 | spin_unlock(&card->files_lock); | |
822 | return 0; | |
823 | } | |
824 | ||
c0d3fb39 TI |
825 | EXPORT_SYMBOL(snd_card_file_add); |
826 | ||
1da177e4 LT |
827 | /** |
828 | * snd_card_file_remove - remove the file from the file list | |
829 | * @card: soundcard structure | |
830 | * @file: file pointer | |
831 | * | |
832 | * This function removes the file formerly added to the card via | |
833 | * snd_card_file_add() function. | |
2b29b13c TI |
834 | * If all files are removed and snd_card_free_when_closed() was |
835 | * called beforehand, it processes the pending release of | |
836 | * resources. | |
1da177e4 LT |
837 | * |
838 | * Returns zero or a negative error code. | |
839 | */ | |
512bbd6a | 840 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
841 | { |
842 | struct snd_monitor_file *mfile, *pfile = NULL; | |
c461482c | 843 | int last_close = 0; |
1da177e4 LT |
844 | |
845 | spin_lock(&card->files_lock); | |
846 | mfile = card->files; | |
847 | while (mfile) { | |
848 | if (mfile->file == file) { | |
849 | if (pfile) | |
850 | pfile->next = mfile->next; | |
851 | else | |
852 | card->files = mfile->next; | |
853 | break; | |
854 | } | |
855 | pfile = mfile; | |
856 | mfile = mfile->next; | |
857 | } | |
a9edfc60 KW |
858 | if (mfile && mfile->disconnected_f_op) { |
859 | fops_put(mfile->disconnected_f_op); | |
860 | spin_lock(&shutdown_lock); | |
861 | list_del(&mfile->shutdown_list); | |
862 | spin_unlock(&shutdown_lock); | |
863 | } | |
1da177e4 | 864 | if (card->files == NULL) |
c461482c TI |
865 | last_close = 1; |
866 | spin_unlock(&card->files_lock); | |
867 | if (last_close) { | |
1da177e4 | 868 | wake_up(&card->shutdown_sleep); |
c461482c TI |
869 | if (card->free_on_last_close) |
870 | snd_card_do_free(card); | |
871 | } | |
1da177e4 LT |
872 | if (!mfile) { |
873 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
874 | return -ENOENT; | |
875 | } | |
876 | kfree(mfile); | |
877 | return 0; | |
878 | } | |
879 | ||
c0d3fb39 TI |
880 | EXPORT_SYMBOL(snd_card_file_remove); |
881 | ||
1da177e4 LT |
882 | #ifdef CONFIG_PM |
883 | /** | |
884 | * snd_power_wait - wait until the power-state is changed. | |
885 | * @card: soundcard structure | |
886 | * @power_state: expected power state | |
1da177e4 LT |
887 | * |
888 | * Waits until the power-state is changed. | |
889 | * | |
890 | * Note: the power lock must be active before call. | |
891 | */ | |
cbac4b0c | 892 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
893 | { |
894 | wait_queue_t wait; | |
895 | int result = 0; | |
896 | ||
897 | /* fastpath */ | |
898 | if (snd_power_get_state(card) == power_state) | |
899 | return 0; | |
900 | init_waitqueue_entry(&wait, current); | |
901 | add_wait_queue(&card->power_sleep, &wait); | |
902 | while (1) { | |
903 | if (card->shutdown) { | |
904 | result = -ENODEV; | |
905 | break; | |
906 | } | |
907 | if (snd_power_get_state(card) == power_state) | |
908 | break; | |
1da177e4 LT |
909 | set_current_state(TASK_UNINTERRUPTIBLE); |
910 | snd_power_unlock(card); | |
911 | schedule_timeout(30 * HZ); | |
912 | snd_power_lock(card); | |
913 | } | |
914 | remove_wait_queue(&card->power_sleep, &wait); | |
915 | return result; | |
916 | } | |
917 | ||
c0d3fb39 | 918 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 919 | #endif /* CONFIG_PM */ |