Commit | Line | Data |
---|---|---|
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 | 123 | /** |
53fb1e63 | 124 | * snd_card_create - create and initialize a soundcard structure |
1da177e4 LT |
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 | |
53fb1e63 | 129 | * @card_ret: the pointer to store the created card instance |
1da177e4 LT |
130 | * |
131 | * Creates and initializes a soundcard structure. | |
132 | * | |
53fb1e63 TI |
133 | * The function allocates snd_card instance via kzalloc with the given |
134 | * space for the driver to use freely. The allocated struct is stored | |
135 | * in the given card_ret pointer. | |
136 | * | |
137 | * Returns zero if successful or a negative error code. | |
1da177e4 | 138 | */ |
53fb1e63 TI |
139 | int snd_card_create(int idx, const char *xid, |
140 | struct module *module, int extra_size, | |
141 | struct snd_card **card_ret) | |
1da177e4 | 142 | { |
512bbd6a | 143 | struct snd_card *card; |
a93bbaa7 | 144 | int err, idx2; |
1da177e4 | 145 | |
53fb1e63 TI |
146 | if (snd_BUG_ON(!card_ret)) |
147 | return -EINVAL; | |
148 | *card_ret = NULL; | |
149 | ||
1da177e4 LT |
150 | if (extra_size < 0) |
151 | extra_size = 0; | |
ca2c0966 | 152 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
53fb1e63 TI |
153 | if (!card) |
154 | return -ENOMEM; | |
1da177e4 | 155 | if (xid) { |
53fb1e63 TI |
156 | if (!snd_info_check_reserved_words(xid)) { |
157 | snd_printk(KERN_ERR | |
158 | "given id string '%s' is reserved.\n", xid); | |
159 | err = -EBUSY; | |
1da177e4 | 160 | goto __error; |
53fb1e63 | 161 | } |
1da177e4 LT |
162 | strlcpy(card->id, xid, sizeof(card->id)); |
163 | } | |
164 | err = 0; | |
746df948 | 165 | mutex_lock(&snd_card_mutex); |
1da177e4 | 166 | if (idx < 0) { |
1da177e4 | 167 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
5c33dd70 | 168 | /* idx == -1 == 0xffff means: take any free slot */ |
1da177e4 | 169 | if (~snd_cards_lock & idx & 1<<idx2) { |
a93bbaa7 TI |
170 | if (module_slot_match(module, idx2)) { |
171 | idx = idx2; | |
172 | break; | |
173 | } | |
174 | } | |
175 | } | |
176 | if (idx < 0) { | |
177 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
178 | /* idx == -1 == 0xffff means: take any free slot */ | |
179 | if (~snd_cards_lock & idx & 1<<idx2) { | |
180 | if (!slots[idx2] || !*slots[idx2]) { | |
181 | idx = idx2; | |
182 | break; | |
183 | } | |
1da177e4 | 184 | } |
5c33dd70 | 185 | } |
a93bbaa7 TI |
186 | if (idx < 0) |
187 | err = -ENODEV; | |
188 | else if (idx < snd_ecards_limit) { | |
189 | if (snd_cards_lock & (1 << idx)) | |
190 | err = -EBUSY; /* invalid */ | |
191 | } else if (idx >= SNDRV_CARDS) | |
192 | err = -ENODEV; | |
193 | if (err < 0) { | |
746df948 | 194 | mutex_unlock(&snd_card_mutex); |
5c33dd70 ON |
195 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
196 | idx, snd_ecards_limit - 1, err); | |
1da177e4 LT |
197 | goto __error; |
198 | } | |
199 | snd_cards_lock |= 1 << idx; /* lock it */ | |
a93bbaa7 TI |
200 | if (idx >= snd_ecards_limit) |
201 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
746df948 | 202 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
203 | card->number = idx; |
204 | card->module = module; | |
205 | INIT_LIST_HEAD(&card->devices); | |
206 | init_rwsem(&card->controls_rwsem); | |
207 | rwlock_init(&card->ctl_files_rwlock); | |
208 | INIT_LIST_HEAD(&card->controls); | |
209 | INIT_LIST_HEAD(&card->ctl_files); | |
210 | spin_lock_init(&card->files_lock); | |
211 | init_waitqueue_head(&card->shutdown_sleep); | |
1da177e4 | 212 | #ifdef CONFIG_PM |
1a60d4c5 | 213 | mutex_init(&card->power_lock); |
1da177e4 LT |
214 | init_waitqueue_head(&card->power_sleep); |
215 | #endif | |
216 | /* the control interface cannot be accessed from the user space until */ | |
217 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
218 | err = snd_ctl_create(card); |
219 | if (err < 0) { | |
220 | snd_printk(KERN_ERR "unable to register control minors\n"); | |
1da177e4 LT |
221 | goto __error; |
222 | } | |
53fb1e63 TI |
223 | err = snd_info_card_create(card); |
224 | if (err < 0) { | |
225 | snd_printk(KERN_ERR "unable to create card info\n"); | |
1da177e4 LT |
226 | goto __error_ctl; |
227 | } | |
228 | if (extra_size > 0) | |
512bbd6a | 229 | card->private_data = (char *)card + sizeof(struct snd_card); |
53fb1e63 TI |
230 | *card_ret = card; |
231 | return 0; | |
1da177e4 LT |
232 | |
233 | __error_ctl: | |
234 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
235 | __error: | |
236 | kfree(card); | |
53fb1e63 | 237 | return err; |
1da177e4 | 238 | } |
53fb1e63 | 239 | EXPORT_SYMBOL(snd_card_create); |
c0d3fb39 | 240 | |
746df948 TI |
241 | /* return non-zero if a card is already locked */ |
242 | int snd_card_locked(int card) | |
243 | { | |
244 | int locked; | |
245 | ||
246 | mutex_lock(&snd_card_mutex); | |
247 | locked = snd_cards_lock & (1 << card); | |
248 | mutex_unlock(&snd_card_mutex); | |
249 | return locked; | |
250 | } | |
251 | ||
b3b0abe1 CL |
252 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
253 | { | |
254 | return -ENODEV; | |
255 | } | |
256 | ||
257 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
258 | size_t count, loff_t *offset) | |
259 | { | |
260 | return -ENODEV; | |
261 | } | |
262 | ||
263 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
264 | size_t count, loff_t *offset) | |
265 | { | |
266 | return -ENODEV; | |
267 | } | |
268 | ||
a9edfc60 KW |
269 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
270 | { | |
271 | struct snd_monitor_file *df = NULL, *_df; | |
272 | ||
273 | spin_lock(&shutdown_lock); | |
274 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
275 | if (_df->file == file) { | |
276 | df = _df; | |
277 | break; | |
278 | } | |
279 | } | |
280 | spin_unlock(&shutdown_lock); | |
281 | ||
233e70f4 AV |
282 | if (likely(df)) { |
283 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
284 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 285 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 286 | } |
a9edfc60 | 287 | |
9bf8e7dd | 288 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
289 | } |
290 | ||
1da177e4 LT |
291 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
292 | { | |
293 | return POLLERR | POLLNVAL; | |
294 | } | |
295 | ||
b3b0abe1 CL |
296 | static long snd_disconnect_ioctl(struct file *file, |
297 | unsigned int cmd, unsigned long arg) | |
298 | { | |
299 | return -ENODEV; | |
300 | } | |
301 | ||
302 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
303 | { | |
304 | return -ENODEV; | |
305 | } | |
306 | ||
307 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
308 | { | |
309 | return -ENODEV; | |
310 | } | |
311 | ||
9c2e08c5 | 312 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
313 | { |
314 | .owner = THIS_MODULE, | |
315 | .llseek = snd_disconnect_llseek, | |
316 | .read = snd_disconnect_read, | |
317 | .write = snd_disconnect_write, | |
318 | .release = snd_disconnect_release, | |
319 | .poll = snd_disconnect_poll, | |
320 | .unlocked_ioctl = snd_disconnect_ioctl, | |
321 | #ifdef CONFIG_COMPAT | |
322 | .compat_ioctl = snd_disconnect_ioctl, | |
323 | #endif | |
324 | .mmap = snd_disconnect_mmap, | |
325 | .fasync = snd_disconnect_fasync | |
326 | }; | |
327 | ||
1da177e4 LT |
328 | /** |
329 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
330 | * @card: soundcard structure | |
331 | * | |
332 | * Disconnects all APIs from the file-operations (user space). | |
333 | * | |
334 | * Returns zero, otherwise a negative error code. | |
335 | * | |
336 | * Note: The current implementation replaces all active file->f_op with special | |
337 | * dummy file operations (they do nothing except release). | |
338 | */ | |
512bbd6a | 339 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
340 | { |
341 | struct snd_monitor_file *mfile; | |
342 | struct file *file; | |
1da177e4 LT |
343 | int err; |
344 | ||
f18638dc TI |
345 | if (!card) |
346 | return -EINVAL; | |
347 | ||
1da177e4 LT |
348 | spin_lock(&card->files_lock); |
349 | if (card->shutdown) { | |
350 | spin_unlock(&card->files_lock); | |
351 | return 0; | |
352 | } | |
353 | card->shutdown = 1; | |
354 | spin_unlock(&card->files_lock); | |
355 | ||
356 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 357 | mutex_lock(&snd_card_mutex); |
1da177e4 | 358 | snd_cards[card->number] = NULL; |
f18638dc | 359 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 360 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
361 | |
362 | /* phase 2: replace file->f_op with special dummy operations */ | |
363 | ||
364 | spin_lock(&card->files_lock); | |
365 | mfile = card->files; | |
366 | while (mfile) { | |
367 | file = mfile->file; | |
368 | ||
369 | /* it's critical part, use endless loop */ | |
370 | /* we have no room to fail */ | |
a9edfc60 | 371 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 372 | |
a9edfc60 KW |
373 | spin_lock(&shutdown_lock); |
374 | list_add(&mfile->shutdown_list, &shutdown_files); | |
375 | spin_unlock(&shutdown_lock); | |
1da177e4 | 376 | |
a9edfc60 | 377 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 378 | fops_get(mfile->file->f_op); |
1da177e4 LT |
379 | |
380 | mfile = mfile->next; | |
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 | ||
746d4a02 | 397 | snd_info_card_disconnect(card); |
73d38b13 TI |
398 | #ifndef CONFIG_SYSFS_DEPRECATED |
399 | if (card->card_dev) { | |
400 | device_unregister(card->card_dev); | |
401 | card->card_dev = NULL; | |
402 | } | |
f18638dc TI |
403 | #endif |
404 | #ifdef CONFIG_PM | |
405 | wake_up(&card->power_sleep); | |
73d38b13 | 406 | #endif |
1da177e4 LT |
407 | return 0; |
408 | } | |
409 | ||
c0d3fb39 TI |
410 | EXPORT_SYMBOL(snd_card_disconnect); |
411 | ||
1da177e4 LT |
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 | */ | |
c461482c | 423 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 424 | { |
1da177e4 LT |
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); | |
746d4a02 | 443 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
444 | if (snd_info_card_free(card) < 0) { |
445 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
446 | /* Not fatal error */ | |
447 | } | |
c461482c TI |
448 | kfree(card); |
449 | return 0; | |
450 | } | |
451 | ||
c461482c TI |
452 | int snd_card_free_when_closed(struct snd_card *card) |
453 | { | |
454 | int free_now = 0; | |
f18638dc | 455 | int ret = snd_card_disconnect(card); |
c461482c TI |
456 | if (ret) |
457 | return ret; | |
458 | ||
459 | spin_lock(&card->files_lock); | |
460 | if (card->files == NULL) | |
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 | { | |
f18638dc | 475 | int ret = snd_card_disconnect(card); |
c461482c TI |
476 | if (ret) |
477 | return ret; | |
478 | ||
479 | /* wait, until all devices are ready for the free operation */ | |
480 | wait_event(card->shutdown_sleep, card->files == NULL); | |
481 | snd_card_do_free(card); | |
1da177e4 LT |
482 | return 0; |
483 | } | |
484 | ||
c0d3fb39 TI |
485 | EXPORT_SYMBOL(snd_card_free); |
486 | ||
512bbd6a | 487 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 488 | { |
d001544d | 489 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
490 | char *id, *spos; |
491 | ||
492 | id = spos = card->shortname; | |
493 | while (*id != '\0') { | |
494 | if (*id == ' ') | |
495 | spos = id + 1; | |
496 | id++; | |
497 | } | |
498 | id = card->id; | |
499 | while (*spos != '\0' && !isalnum(*spos)) | |
500 | spos++; | |
501 | if (isdigit(*spos)) | |
502 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
503 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
504 | if (isalnum(*spos)) | |
505 | *id++ = *spos; | |
506 | spos++; | |
507 | } | |
508 | *id = '\0'; | |
509 | ||
510 | id = card->id; | |
511 | ||
512 | if (*id == '\0') | |
513 | strcpy(id, "default"); | |
514 | ||
515 | while (1) { | |
516 | if (loops-- == 0) { | |
517 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
518 | strcpy(card->id, card->proc_root->name); | |
519 | return; | |
520 | } | |
521 | if (!snd_info_check_reserved_words(id)) | |
522 | goto __change; | |
523 | for (i = 0; i < snd_ecards_limit; i++) { | |
524 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
525 | goto __change; | |
526 | } | |
527 | break; | |
528 | ||
529 | __change: | |
530 | len = strlen(id); | |
d001544d CL |
531 | if (idx_flag) { |
532 | if (id[len-1] != '9') | |
533 | id[len-1]++; | |
534 | else | |
535 | id[len-1] = 'A'; | |
536 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
537 | strcat(id, "_1"); |
538 | idx_flag++; | |
539 | } else { | |
540 | spos = id + len - 2; | |
541 | if ((size_t)len <= sizeof(card->id) - 2) | |
542 | spos++; | |
543 | *spos++ = '_'; | |
544 | *spos++ = '1'; | |
545 | *spos++ = '\0'; | |
546 | idx_flag++; | |
547 | } | |
548 | } | |
549 | } | |
550 | ||
9fb6198e JK |
551 | #ifndef CONFIG_SYSFS_DEPRECATED |
552 | static ssize_t | |
553 | card_id_show_attr(struct device *dev, | |
554 | struct device_attribute *attr, char *buf) | |
555 | { | |
556 | struct snd_card *card = dev_get_drvdata(dev); | |
557 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); | |
558 | } | |
559 | ||
560 | static ssize_t | |
561 | card_id_store_attr(struct device *dev, struct device_attribute *attr, | |
562 | const char *buf, size_t count) | |
563 | { | |
564 | struct snd_card *card = dev_get_drvdata(dev); | |
565 | char buf1[sizeof(card->id)]; | |
566 | size_t copy = count > sizeof(card->id) - 1 ? | |
567 | sizeof(card->id) - 1 : count; | |
568 | size_t idx; | |
569 | int c; | |
570 | ||
571 | for (idx = 0; idx < copy; idx++) { | |
572 | c = buf[idx]; | |
573 | if (!isalnum(c) && c != '_' && c != '-') | |
574 | return -EINVAL; | |
575 | } | |
576 | memcpy(buf1, buf, copy); | |
577 | buf1[copy] = '\0'; | |
578 | mutex_lock(&snd_card_mutex); | |
579 | if (!snd_info_check_reserved_words(buf1)) { | |
580 | __exist: | |
581 | mutex_unlock(&snd_card_mutex); | |
582 | return -EEXIST; | |
583 | } | |
584 | for (idx = 0; idx < snd_ecards_limit; idx++) { | |
585 | if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) | |
586 | goto __exist; | |
587 | } | |
588 | strcpy(card->id, buf1); | |
c2eb9c4e | 589 | snd_info_card_id_change(card); |
9fb6198e JK |
590 | mutex_unlock(&snd_card_mutex); |
591 | ||
592 | return count; | |
593 | } | |
594 | ||
595 | static struct device_attribute card_id_attrs = | |
596 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); | |
597 | ||
598 | static ssize_t | |
599 | card_number_show_attr(struct device *dev, | |
600 | struct device_attribute *attr, char *buf) | |
601 | { | |
602 | struct snd_card *card = dev_get_drvdata(dev); | |
603 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); | |
604 | } | |
605 | ||
606 | static struct device_attribute card_number_attrs = | |
607 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); | |
608 | #endif /* CONFIG_SYSFS_DEPRECATED */ | |
609 | ||
1da177e4 LT |
610 | /** |
611 | * snd_card_register - register the soundcard | |
612 | * @card: soundcard structure | |
613 | * | |
614 | * This function registers all the devices assigned to the soundcard. | |
615 | * Until calling this, the ALSA control interface is blocked from the | |
616 | * external accesses. Thus, you should call this function at the end | |
617 | * of the initialization of the card. | |
618 | * | |
619 | * Returns zero otherwise a negative error code if the registrain failed. | |
620 | */ | |
512bbd6a | 621 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
622 | { |
623 | int err; | |
1da177e4 | 624 | |
7eaa943c TI |
625 | if (snd_BUG_ON(!card)) |
626 | return -EINVAL; | |
7d2aae1e TI |
627 | #ifndef CONFIG_SYSFS_DEPRECATED |
628 | if (!card->card_dev) { | |
abe9ab8f | 629 | card->card_dev = device_create(sound_class, card->dev, |
9fb6198e | 630 | MKDEV(0, 0), card, |
abe9ab8f | 631 | "card%i", card->number); |
7d2aae1e TI |
632 | if (IS_ERR(card->card_dev)) |
633 | card->card_dev = NULL; | |
d80f19fa | 634 | } |
7d2aae1e | 635 | #endif |
1da177e4 LT |
636 | if ((err = snd_device_register_all(card)) < 0) |
637 | return err; | |
746df948 | 638 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
639 | if (snd_cards[card->number]) { |
640 | /* already registered */ | |
746df948 | 641 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
642 | return 0; |
643 | } | |
644 | if (card->id[0] == '\0') | |
645 | choose_default_id(card); | |
646 | snd_cards[card->number] = card; | |
746df948 | 647 | mutex_unlock(&snd_card_mutex); |
e28563cc | 648 | init_info_for_card(card); |
1da177e4 LT |
649 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
650 | if (snd_mixer_oss_notify_callback) | |
651 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e JK |
652 | #endif |
653 | #ifndef CONFIG_SYSFS_DEPRECATED | |
654 | if (card->card_dev) { | |
2af75293 HE |
655 | err = device_create_file(card->card_dev, &card_id_attrs); |
656 | if (err < 0) | |
657 | return err; | |
658 | err = device_create_file(card->card_dev, &card_number_attrs); | |
659 | if (err < 0) | |
660 | return err; | |
9fb6198e | 661 | } |
1da177e4 LT |
662 | #endif |
663 | return 0; | |
664 | } | |
665 | ||
c0d3fb39 TI |
666 | EXPORT_SYMBOL(snd_card_register); |
667 | ||
e28563cc | 668 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 669 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 670 | |
a381a7a6 TI |
671 | static void snd_card_info_read(struct snd_info_entry *entry, |
672 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
673 | { |
674 | int idx, count; | |
512bbd6a | 675 | struct snd_card *card; |
1da177e4 LT |
676 | |
677 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 678 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
679 | if ((card = snd_cards[idx]) != NULL) { |
680 | count++; | |
d001544d | 681 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
682 | idx, |
683 | card->id, | |
684 | card->driver, | |
685 | card->shortname); | |
d001544d | 686 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
687 | card->longname); |
688 | } | |
746df948 | 689 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
690 | } |
691 | if (!count) | |
692 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
693 | } | |
694 | ||
e28563cc | 695 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 696 | |
512bbd6a | 697 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
698 | { |
699 | int idx, count; | |
512bbd6a | 700 | struct snd_card *card; |
1da177e4 LT |
701 | |
702 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 703 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
704 | if ((card = snd_cards[idx]) != NULL) { |
705 | count++; | |
706 | snd_iprintf(buffer, "%s\n", card->longname); | |
707 | } | |
746df948 | 708 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
709 | } |
710 | if (!count) { | |
711 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
712 | } | |
713 | } | |
714 | ||
715 | #endif | |
716 | ||
717 | #ifdef MODULE | |
512bbd6a TI |
718 | static struct snd_info_entry *snd_card_module_info_entry; |
719 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
720 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
721 | { |
722 | int idx; | |
512bbd6a | 723 | struct snd_card *card; |
1da177e4 LT |
724 | |
725 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 726 | mutex_lock(&snd_card_mutex); |
1da177e4 | 727 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
728 | snd_iprintf(buffer, "%2i %s\n", |
729 | idx, card->module->name); | |
746df948 | 730 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
731 | } |
732 | } | |
733 | #endif | |
734 | ||
735 | int __init snd_card_info_init(void) | |
736 | { | |
512bbd6a | 737 | struct snd_info_entry *entry; |
1da177e4 LT |
738 | |
739 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
740 | if (! entry) |
741 | return -ENOMEM; | |
1da177e4 LT |
742 | entry->c.text.read = snd_card_info_read; |
743 | if (snd_info_register(entry) < 0) { | |
744 | snd_info_free_entry(entry); | |
745 | return -ENOMEM; | |
746 | } | |
747 | snd_card_info_entry = entry; | |
748 | ||
749 | #ifdef MODULE | |
750 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
751 | if (entry) { | |
1da177e4 LT |
752 | entry->c.text.read = snd_card_module_info_read; |
753 | if (snd_info_register(entry) < 0) | |
754 | snd_info_free_entry(entry); | |
755 | else | |
756 | snd_card_module_info_entry = entry; | |
757 | } | |
758 | #endif | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
763 | int __exit snd_card_info_done(void) | |
764 | { | |
746d4a02 | 765 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 766 | #ifdef MODULE |
746d4a02 | 767 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
768 | #endif |
769 | return 0; | |
770 | } | |
771 | ||
e28563cc TI |
772 | #endif /* CONFIG_PROC_FS */ |
773 | ||
1da177e4 LT |
774 | /** |
775 | * snd_component_add - add a component string | |
776 | * @card: soundcard structure | |
777 | * @component: the component id string | |
778 | * | |
779 | * This function adds the component id string to the supported list. | |
780 | * The component can be referred from the alsa-lib. | |
781 | * | |
782 | * Returns zero otherwise a negative error code. | |
783 | */ | |
784 | ||
512bbd6a | 785 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
786 | { |
787 | char *ptr; | |
788 | int len = strlen(component); | |
789 | ||
790 | ptr = strstr(card->components, component); | |
791 | if (ptr != NULL) { | |
792 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
793 | return 1; | |
794 | } | |
795 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
796 | snd_BUG(); | |
797 | return -ENOMEM; | |
798 | } | |
799 | if (card->components[0] != '\0') | |
800 | strcat(card->components, " "); | |
801 | strcat(card->components, component); | |
802 | return 0; | |
803 | } | |
804 | ||
c0d3fb39 TI |
805 | EXPORT_SYMBOL(snd_component_add); |
806 | ||
1da177e4 LT |
807 | /** |
808 | * snd_card_file_add - add the file to the file list of the card | |
809 | * @card: soundcard structure | |
810 | * @file: file pointer | |
811 | * | |
812 | * This function adds the file to the file linked-list of the card. | |
813 | * This linked-list is used to keep tracking the connection state, | |
814 | * and to avoid the release of busy resources by hotplug. | |
815 | * | |
816 | * Returns zero or a negative error code. | |
817 | */ | |
512bbd6a | 818 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
819 | { |
820 | struct snd_monitor_file *mfile; | |
821 | ||
822 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
823 | if (mfile == NULL) | |
824 | return -ENOMEM; | |
825 | mfile->file = file; | |
a9edfc60 | 826 | mfile->disconnected_f_op = NULL; |
1da177e4 LT |
827 | mfile->next = NULL; |
828 | spin_lock(&card->files_lock); | |
829 | if (card->shutdown) { | |
830 | spin_unlock(&card->files_lock); | |
831 | kfree(mfile); | |
832 | return -ENODEV; | |
833 | } | |
834 | mfile->next = card->files; | |
835 | card->files = mfile; | |
836 | spin_unlock(&card->files_lock); | |
837 | return 0; | |
838 | } | |
839 | ||
c0d3fb39 TI |
840 | EXPORT_SYMBOL(snd_card_file_add); |
841 | ||
1da177e4 LT |
842 | /** |
843 | * snd_card_file_remove - remove the file from the file list | |
844 | * @card: soundcard structure | |
845 | * @file: file pointer | |
846 | * | |
847 | * This function removes the file formerly added to the card via | |
848 | * snd_card_file_add() function. | |
2b29b13c TI |
849 | * If all files are removed and snd_card_free_when_closed() was |
850 | * called beforehand, it processes the pending release of | |
851 | * resources. | |
1da177e4 LT |
852 | * |
853 | * Returns zero or a negative error code. | |
854 | */ | |
512bbd6a | 855 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 LT |
856 | { |
857 | struct snd_monitor_file *mfile, *pfile = NULL; | |
c461482c | 858 | int last_close = 0; |
1da177e4 LT |
859 | |
860 | spin_lock(&card->files_lock); | |
861 | mfile = card->files; | |
862 | while (mfile) { | |
863 | if (mfile->file == file) { | |
864 | if (pfile) | |
865 | pfile->next = mfile->next; | |
866 | else | |
867 | card->files = mfile->next; | |
868 | break; | |
869 | } | |
870 | pfile = mfile; | |
871 | mfile = mfile->next; | |
872 | } | |
a9edfc60 KW |
873 | if (mfile && mfile->disconnected_f_op) { |
874 | fops_put(mfile->disconnected_f_op); | |
875 | spin_lock(&shutdown_lock); | |
876 | list_del(&mfile->shutdown_list); | |
877 | spin_unlock(&shutdown_lock); | |
878 | } | |
1da177e4 | 879 | if (card->files == NULL) |
c461482c TI |
880 | last_close = 1; |
881 | spin_unlock(&card->files_lock); | |
882 | if (last_close) { | |
1da177e4 | 883 | wake_up(&card->shutdown_sleep); |
c461482c TI |
884 | if (card->free_on_last_close) |
885 | snd_card_do_free(card); | |
886 | } | |
1da177e4 LT |
887 | if (!mfile) { |
888 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); | |
889 | return -ENOENT; | |
890 | } | |
891 | kfree(mfile); | |
892 | return 0; | |
893 | } | |
894 | ||
c0d3fb39 TI |
895 | EXPORT_SYMBOL(snd_card_file_remove); |
896 | ||
1da177e4 LT |
897 | #ifdef CONFIG_PM |
898 | /** | |
899 | * snd_power_wait - wait until the power-state is changed. | |
900 | * @card: soundcard structure | |
901 | * @power_state: expected power state | |
1da177e4 LT |
902 | * |
903 | * Waits until the power-state is changed. | |
904 | * | |
905 | * Note: the power lock must be active before call. | |
906 | */ | |
cbac4b0c | 907 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
908 | { |
909 | wait_queue_t wait; | |
910 | int result = 0; | |
911 | ||
912 | /* fastpath */ | |
913 | if (snd_power_get_state(card) == power_state) | |
914 | return 0; | |
915 | init_waitqueue_entry(&wait, current); | |
916 | add_wait_queue(&card->power_sleep, &wait); | |
917 | while (1) { | |
918 | if (card->shutdown) { | |
919 | result = -ENODEV; | |
920 | break; | |
921 | } | |
922 | if (snd_power_get_state(card) == power_state) | |
923 | break; | |
1da177e4 LT |
924 | set_current_state(TASK_UNINTERRUPTIBLE); |
925 | snd_power_unlock(card); | |
926 | schedule_timeout(30 * HZ); | |
927 | snd_power_lock(card); | |
928 | } | |
929 | remove_wait_queue(&card->power_sleep, &wait); | |
930 | return result; | |
931 | } | |
932 | ||
c0d3fb39 | 933 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 934 | #endif /* CONFIG_PM */ |