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); | |
118dd6bf | 211 | INIT_LIST_HEAD(&card->files_list); |
1da177e4 | 212 | init_waitqueue_head(&card->shutdown_sleep); |
1da177e4 | 213 | #ifdef CONFIG_PM |
1a60d4c5 | 214 | mutex_init(&card->power_lock); |
1da177e4 LT |
215 | init_waitqueue_head(&card->power_sleep); |
216 | #endif | |
217 | /* the control interface cannot be accessed from the user space until */ | |
218 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
219 | err = snd_ctl_create(card); |
220 | if (err < 0) { | |
221 | snd_printk(KERN_ERR "unable to register control minors\n"); | |
1da177e4 LT |
222 | goto __error; |
223 | } | |
53fb1e63 TI |
224 | err = snd_info_card_create(card); |
225 | if (err < 0) { | |
226 | snd_printk(KERN_ERR "unable to create card info\n"); | |
1da177e4 LT |
227 | goto __error_ctl; |
228 | } | |
229 | if (extra_size > 0) | |
512bbd6a | 230 | card->private_data = (char *)card + sizeof(struct snd_card); |
53fb1e63 TI |
231 | *card_ret = card; |
232 | return 0; | |
1da177e4 LT |
233 | |
234 | __error_ctl: | |
235 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
236 | __error: | |
237 | kfree(card); | |
53fb1e63 | 238 | return err; |
1da177e4 | 239 | } |
53fb1e63 | 240 | EXPORT_SYMBOL(snd_card_create); |
c0d3fb39 | 241 | |
746df948 TI |
242 | /* return non-zero if a card is already locked */ |
243 | int snd_card_locked(int card) | |
244 | { | |
245 | int locked; | |
246 | ||
247 | mutex_lock(&snd_card_mutex); | |
248 | locked = snd_cards_lock & (1 << card); | |
249 | mutex_unlock(&snd_card_mutex); | |
250 | return locked; | |
251 | } | |
252 | ||
b3b0abe1 CL |
253 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
254 | { | |
255 | return -ENODEV; | |
256 | } | |
257 | ||
258 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
259 | size_t count, loff_t *offset) | |
260 | { | |
261 | return -ENODEV; | |
262 | } | |
263 | ||
264 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
265 | size_t count, loff_t *offset) | |
266 | { | |
267 | return -ENODEV; | |
268 | } | |
269 | ||
a9edfc60 KW |
270 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
271 | { | |
272 | struct snd_monitor_file *df = NULL, *_df; | |
273 | ||
274 | spin_lock(&shutdown_lock); | |
275 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
276 | if (_df->file == file) { | |
277 | df = _df; | |
118dd6bf | 278 | list_del_init(&df->shutdown_list); |
a9edfc60 KW |
279 | break; |
280 | } | |
281 | } | |
282 | spin_unlock(&shutdown_lock); | |
283 | ||
233e70f4 AV |
284 | if (likely(df)) { |
285 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
286 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 287 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 288 | } |
a9edfc60 | 289 | |
9bf8e7dd | 290 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
291 | } |
292 | ||
1da177e4 LT |
293 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
294 | { | |
295 | return POLLERR | POLLNVAL; | |
296 | } | |
297 | ||
b3b0abe1 CL |
298 | static long snd_disconnect_ioctl(struct file *file, |
299 | unsigned int cmd, unsigned long arg) | |
300 | { | |
301 | return -ENODEV; | |
302 | } | |
303 | ||
304 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
305 | { | |
306 | return -ENODEV; | |
307 | } | |
308 | ||
309 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
310 | { | |
311 | return -ENODEV; | |
312 | } | |
313 | ||
9c2e08c5 | 314 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
315 | { |
316 | .owner = THIS_MODULE, | |
317 | .llseek = snd_disconnect_llseek, | |
318 | .read = snd_disconnect_read, | |
319 | .write = snd_disconnect_write, | |
320 | .release = snd_disconnect_release, | |
321 | .poll = snd_disconnect_poll, | |
322 | .unlocked_ioctl = snd_disconnect_ioctl, | |
323 | #ifdef CONFIG_COMPAT | |
324 | .compat_ioctl = snd_disconnect_ioctl, | |
325 | #endif | |
326 | .mmap = snd_disconnect_mmap, | |
327 | .fasync = snd_disconnect_fasync | |
328 | }; | |
329 | ||
1da177e4 LT |
330 | /** |
331 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
332 | * @card: soundcard structure | |
333 | * | |
334 | * Disconnects all APIs from the file-operations (user space). | |
335 | * | |
336 | * Returns zero, otherwise a negative error code. | |
337 | * | |
338 | * Note: The current implementation replaces all active file->f_op with special | |
339 | * dummy file operations (they do nothing except release). | |
340 | */ | |
512bbd6a | 341 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
342 | { |
343 | struct snd_monitor_file *mfile; | |
344 | struct file *file; | |
1da177e4 LT |
345 | int err; |
346 | ||
f18638dc TI |
347 | if (!card) |
348 | return -EINVAL; | |
349 | ||
1da177e4 LT |
350 | spin_lock(&card->files_lock); |
351 | if (card->shutdown) { | |
352 | spin_unlock(&card->files_lock); | |
353 | return 0; | |
354 | } | |
355 | card->shutdown = 1; | |
356 | spin_unlock(&card->files_lock); | |
357 | ||
358 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 359 | mutex_lock(&snd_card_mutex); |
1da177e4 | 360 | snd_cards[card->number] = NULL; |
f18638dc | 361 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 362 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
363 | |
364 | /* phase 2: replace file->f_op with special dummy operations */ | |
365 | ||
366 | spin_lock(&card->files_lock); | |
118dd6bf | 367 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 LT |
368 | file = mfile->file; |
369 | ||
370 | /* it's critical part, use endless loop */ | |
371 | /* we have no room to fail */ | |
a9edfc60 | 372 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 373 | |
a9edfc60 KW |
374 | spin_lock(&shutdown_lock); |
375 | list_add(&mfile->shutdown_list, &shutdown_files); | |
376 | spin_unlock(&shutdown_lock); | |
1da177e4 | 377 | |
a9edfc60 | 378 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 379 | fops_get(mfile->file->f_op); |
1da177e4 LT |
380 | } |
381 | spin_unlock(&card->files_lock); | |
382 | ||
383 | /* phase 3: notify all connected devices about disconnection */ | |
384 | /* at this point, they cannot respond to any calls except release() */ | |
385 | ||
386 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
387 | if (snd_mixer_oss_notify_callback) | |
388 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
389 | #endif | |
390 | ||
391 | /* notify all devices that we are disconnected */ | |
392 | err = snd_device_disconnect_all(card); | |
393 | if (err < 0) | |
394 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
395 | ||
746d4a02 | 396 | snd_info_card_disconnect(card); |
73d38b13 TI |
397 | #ifndef CONFIG_SYSFS_DEPRECATED |
398 | if (card->card_dev) { | |
399 | device_unregister(card->card_dev); | |
400 | card->card_dev = NULL; | |
401 | } | |
f18638dc TI |
402 | #endif |
403 | #ifdef CONFIG_PM | |
404 | wake_up(&card->power_sleep); | |
73d38b13 | 405 | #endif |
1da177e4 LT |
406 | return 0; |
407 | } | |
408 | ||
c0d3fb39 TI |
409 | EXPORT_SYMBOL(snd_card_disconnect); |
410 | ||
1da177e4 LT |
411 | /** |
412 | * snd_card_free - frees given soundcard structure | |
413 | * @card: soundcard structure | |
414 | * | |
415 | * This function releases the soundcard structure and the all assigned | |
416 | * devices automatically. That is, you don't have to release the devices | |
417 | * by yourself. | |
418 | * | |
419 | * Returns zero. Frees all associated devices and frees the control | |
420 | * interface associated to given soundcard. | |
421 | */ | |
c461482c | 422 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 423 | { |
1da177e4 LT |
424 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
425 | if (snd_mixer_oss_notify_callback) | |
426 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
427 | #endif | |
428 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
429 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
430 | /* Fatal, but this situation should never occur */ | |
431 | } | |
432 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
433 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
434 | /* Fatal, but this situation should never occur */ | |
435 | } | |
436 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
437 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
438 | /* Fatal, but this situation should never occur */ | |
439 | } | |
440 | if (card->private_free) | |
441 | card->private_free(card); | |
746d4a02 | 442 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
443 | if (snd_info_card_free(card) < 0) { |
444 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
445 | /* Not fatal error */ | |
446 | } | |
c461482c TI |
447 | kfree(card); |
448 | return 0; | |
449 | } | |
450 | ||
c461482c TI |
451 | int snd_card_free_when_closed(struct snd_card *card) |
452 | { | |
453 | int free_now = 0; | |
f18638dc | 454 | int ret = snd_card_disconnect(card); |
c461482c TI |
455 | if (ret) |
456 | return ret; | |
457 | ||
458 | spin_lock(&card->files_lock); | |
118dd6bf | 459 | if (list_empty(&card->files_list)) |
c461482c TI |
460 | free_now = 1; |
461 | else | |
462 | card->free_on_last_close = 1; | |
463 | spin_unlock(&card->files_lock); | |
464 | ||
465 | if (free_now) | |
466 | snd_card_do_free(card); | |
467 | return 0; | |
468 | } | |
469 | ||
470 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
471 | ||
472 | int snd_card_free(struct snd_card *card) | |
473 | { | |
f18638dc | 474 | int ret = snd_card_disconnect(card); |
c461482c TI |
475 | if (ret) |
476 | return ret; | |
477 | ||
478 | /* wait, until all devices are ready for the free operation */ | |
118dd6bf | 479 | wait_event(card->shutdown_sleep, list_empty(&card->files_list)); |
c461482c | 480 | snd_card_do_free(card); |
1da177e4 LT |
481 | return 0; |
482 | } | |
483 | ||
c0d3fb39 TI |
484 | EXPORT_SYMBOL(snd_card_free); |
485 | ||
512bbd6a | 486 | static void choose_default_id(struct snd_card *card) |
1da177e4 | 487 | { |
d001544d | 488 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
1da177e4 LT |
489 | char *id, *spos; |
490 | ||
491 | id = spos = card->shortname; | |
492 | while (*id != '\0') { | |
493 | if (*id == ' ') | |
494 | spos = id + 1; | |
495 | id++; | |
496 | } | |
497 | id = card->id; | |
498 | while (*spos != '\0' && !isalnum(*spos)) | |
499 | spos++; | |
500 | if (isdigit(*spos)) | |
501 | *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; | |
502 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { | |
503 | if (isalnum(*spos)) | |
504 | *id++ = *spos; | |
505 | spos++; | |
506 | } | |
507 | *id = '\0'; | |
508 | ||
509 | id = card->id; | |
510 | ||
511 | if (*id == '\0') | |
512 | strcpy(id, "default"); | |
513 | ||
514 | while (1) { | |
515 | if (loops-- == 0) { | |
516 | snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); | |
517 | strcpy(card->id, card->proc_root->name); | |
518 | return; | |
519 | } | |
520 | if (!snd_info_check_reserved_words(id)) | |
521 | goto __change; | |
522 | for (i = 0; i < snd_ecards_limit; i++) { | |
523 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) | |
524 | goto __change; | |
525 | } | |
526 | break; | |
527 | ||
528 | __change: | |
529 | len = strlen(id); | |
d001544d CL |
530 | if (idx_flag) { |
531 | if (id[len-1] != '9') | |
532 | id[len-1]++; | |
533 | else | |
534 | id[len-1] = 'A'; | |
535 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
536 | strcat(id, "_1"); |
537 | idx_flag++; | |
538 | } else { | |
539 | spos = id + len - 2; | |
540 | if ((size_t)len <= sizeof(card->id) - 2) | |
541 | spos++; | |
542 | *spos++ = '_'; | |
543 | *spos++ = '1'; | |
544 | *spos++ = '\0'; | |
545 | idx_flag++; | |
546 | } | |
547 | } | |
548 | } | |
549 | ||
9fb6198e JK |
550 | #ifndef CONFIG_SYSFS_DEPRECATED |
551 | static ssize_t | |
552 | card_id_show_attr(struct device *dev, | |
553 | struct device_attribute *attr, char *buf) | |
554 | { | |
555 | struct snd_card *card = dev_get_drvdata(dev); | |
556 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); | |
557 | } | |
558 | ||
559 | static ssize_t | |
560 | card_id_store_attr(struct device *dev, struct device_attribute *attr, | |
561 | const char *buf, size_t count) | |
562 | { | |
563 | struct snd_card *card = dev_get_drvdata(dev); | |
564 | char buf1[sizeof(card->id)]; | |
565 | size_t copy = count > sizeof(card->id) - 1 ? | |
566 | sizeof(card->id) - 1 : count; | |
567 | size_t idx; | |
568 | int c; | |
569 | ||
570 | for (idx = 0; idx < copy; idx++) { | |
571 | c = buf[idx]; | |
572 | if (!isalnum(c) && c != '_' && c != '-') | |
573 | return -EINVAL; | |
574 | } | |
575 | memcpy(buf1, buf, copy); | |
576 | buf1[copy] = '\0'; | |
577 | mutex_lock(&snd_card_mutex); | |
578 | if (!snd_info_check_reserved_words(buf1)) { | |
579 | __exist: | |
580 | mutex_unlock(&snd_card_mutex); | |
581 | return -EEXIST; | |
582 | } | |
583 | for (idx = 0; idx < snd_ecards_limit; idx++) { | |
584 | if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) | |
585 | goto __exist; | |
586 | } | |
587 | strcpy(card->id, buf1); | |
c2eb9c4e | 588 | snd_info_card_id_change(card); |
9fb6198e JK |
589 | mutex_unlock(&snd_card_mutex); |
590 | ||
591 | return count; | |
592 | } | |
593 | ||
594 | static struct device_attribute card_id_attrs = | |
595 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); | |
596 | ||
597 | static ssize_t | |
598 | card_number_show_attr(struct device *dev, | |
599 | struct device_attribute *attr, char *buf) | |
600 | { | |
601 | struct snd_card *card = dev_get_drvdata(dev); | |
602 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); | |
603 | } | |
604 | ||
605 | static struct device_attribute card_number_attrs = | |
606 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); | |
607 | #endif /* CONFIG_SYSFS_DEPRECATED */ | |
608 | ||
1da177e4 LT |
609 | /** |
610 | * snd_card_register - register the soundcard | |
611 | * @card: soundcard structure | |
612 | * | |
613 | * This function registers all the devices assigned to the soundcard. | |
614 | * Until calling this, the ALSA control interface is blocked from the | |
615 | * external accesses. Thus, you should call this function at the end | |
616 | * of the initialization of the card. | |
617 | * | |
618 | * Returns zero otherwise a negative error code if the registrain failed. | |
619 | */ | |
512bbd6a | 620 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
621 | { |
622 | int err; | |
1da177e4 | 623 | |
7eaa943c TI |
624 | if (snd_BUG_ON(!card)) |
625 | return -EINVAL; | |
7d2aae1e TI |
626 | #ifndef CONFIG_SYSFS_DEPRECATED |
627 | if (!card->card_dev) { | |
abe9ab8f | 628 | card->card_dev = device_create(sound_class, card->dev, |
9fb6198e | 629 | MKDEV(0, 0), card, |
abe9ab8f | 630 | "card%i", card->number); |
7d2aae1e TI |
631 | if (IS_ERR(card->card_dev)) |
632 | card->card_dev = NULL; | |
d80f19fa | 633 | } |
7d2aae1e | 634 | #endif |
1da177e4 LT |
635 | if ((err = snd_device_register_all(card)) < 0) |
636 | return err; | |
746df948 | 637 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
638 | if (snd_cards[card->number]) { |
639 | /* already registered */ | |
746df948 | 640 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
641 | return 0; |
642 | } | |
643 | if (card->id[0] == '\0') | |
644 | choose_default_id(card); | |
645 | snd_cards[card->number] = card; | |
746df948 | 646 | mutex_unlock(&snd_card_mutex); |
e28563cc | 647 | init_info_for_card(card); |
1da177e4 LT |
648 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
649 | if (snd_mixer_oss_notify_callback) | |
650 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e JK |
651 | #endif |
652 | #ifndef CONFIG_SYSFS_DEPRECATED | |
653 | if (card->card_dev) { | |
2af75293 HE |
654 | err = device_create_file(card->card_dev, &card_id_attrs); |
655 | if (err < 0) | |
656 | return err; | |
657 | err = device_create_file(card->card_dev, &card_number_attrs); | |
658 | if (err < 0) | |
659 | return err; | |
9fb6198e | 660 | } |
1da177e4 LT |
661 | #endif |
662 | return 0; | |
663 | } | |
664 | ||
c0d3fb39 TI |
665 | EXPORT_SYMBOL(snd_card_register); |
666 | ||
e28563cc | 667 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 668 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 669 | |
a381a7a6 TI |
670 | static void snd_card_info_read(struct snd_info_entry *entry, |
671 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
672 | { |
673 | int idx, count; | |
512bbd6a | 674 | struct snd_card *card; |
1da177e4 LT |
675 | |
676 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 677 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
678 | if ((card = snd_cards[idx]) != NULL) { |
679 | count++; | |
d001544d | 680 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
681 | idx, |
682 | card->id, | |
683 | card->driver, | |
684 | card->shortname); | |
d001544d | 685 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
686 | card->longname); |
687 | } | |
746df948 | 688 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
689 | } |
690 | if (!count) | |
691 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
692 | } | |
693 | ||
e28563cc | 694 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 695 | |
512bbd6a | 696 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
697 | { |
698 | int idx, count; | |
512bbd6a | 699 | struct snd_card *card; |
1da177e4 LT |
700 | |
701 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 702 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
703 | if ((card = snd_cards[idx]) != NULL) { |
704 | count++; | |
705 | snd_iprintf(buffer, "%s\n", card->longname); | |
706 | } | |
746df948 | 707 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
708 | } |
709 | if (!count) { | |
710 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
711 | } | |
712 | } | |
713 | ||
714 | #endif | |
715 | ||
716 | #ifdef MODULE | |
512bbd6a TI |
717 | static struct snd_info_entry *snd_card_module_info_entry; |
718 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
719 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
720 | { |
721 | int idx; | |
512bbd6a | 722 | struct snd_card *card; |
1da177e4 LT |
723 | |
724 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 725 | mutex_lock(&snd_card_mutex); |
1da177e4 | 726 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
727 | snd_iprintf(buffer, "%2i %s\n", |
728 | idx, card->module->name); | |
746df948 | 729 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
730 | } |
731 | } | |
732 | #endif | |
733 | ||
734 | int __init snd_card_info_init(void) | |
735 | { | |
512bbd6a | 736 | struct snd_info_entry *entry; |
1da177e4 LT |
737 | |
738 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
739 | if (! entry) |
740 | return -ENOMEM; | |
1da177e4 LT |
741 | entry->c.text.read = snd_card_info_read; |
742 | if (snd_info_register(entry) < 0) { | |
743 | snd_info_free_entry(entry); | |
744 | return -ENOMEM; | |
745 | } | |
746 | snd_card_info_entry = entry; | |
747 | ||
748 | #ifdef MODULE | |
749 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
750 | if (entry) { | |
1da177e4 LT |
751 | entry->c.text.read = snd_card_module_info_read; |
752 | if (snd_info_register(entry) < 0) | |
753 | snd_info_free_entry(entry); | |
754 | else | |
755 | snd_card_module_info_entry = entry; | |
756 | } | |
757 | #endif | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | int __exit snd_card_info_done(void) | |
763 | { | |
746d4a02 | 764 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 765 | #ifdef MODULE |
746d4a02 | 766 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
767 | #endif |
768 | return 0; | |
769 | } | |
770 | ||
e28563cc TI |
771 | #endif /* CONFIG_PROC_FS */ |
772 | ||
1da177e4 LT |
773 | /** |
774 | * snd_component_add - add a component string | |
775 | * @card: soundcard structure | |
776 | * @component: the component id string | |
777 | * | |
778 | * This function adds the component id string to the supported list. | |
779 | * The component can be referred from the alsa-lib. | |
780 | * | |
781 | * Returns zero otherwise a negative error code. | |
782 | */ | |
783 | ||
512bbd6a | 784 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
785 | { |
786 | char *ptr; | |
787 | int len = strlen(component); | |
788 | ||
789 | ptr = strstr(card->components, component); | |
790 | if (ptr != NULL) { | |
791 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
792 | return 1; | |
793 | } | |
794 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
795 | snd_BUG(); | |
796 | return -ENOMEM; | |
797 | } | |
798 | if (card->components[0] != '\0') | |
799 | strcat(card->components, " "); | |
800 | strcat(card->components, component); | |
801 | return 0; | |
802 | } | |
803 | ||
c0d3fb39 TI |
804 | EXPORT_SYMBOL(snd_component_add); |
805 | ||
1da177e4 LT |
806 | /** |
807 | * snd_card_file_add - add the file to the file list of the card | |
808 | * @card: soundcard structure | |
809 | * @file: file pointer | |
810 | * | |
811 | * This function adds the file to the file linked-list of the card. | |
812 | * This linked-list is used to keep tracking the connection state, | |
813 | * and to avoid the release of busy resources by hotplug. | |
814 | * | |
815 | * Returns zero or a negative error code. | |
816 | */ | |
512bbd6a | 817 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
818 | { |
819 | struct snd_monitor_file *mfile; | |
820 | ||
821 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
822 | if (mfile == NULL) | |
823 | return -ENOMEM; | |
824 | mfile->file = file; | |
a9edfc60 | 825 | mfile->disconnected_f_op = NULL; |
1da177e4 LT |
826 | spin_lock(&card->files_lock); |
827 | if (card->shutdown) { | |
828 | spin_unlock(&card->files_lock); | |
829 | kfree(mfile); | |
830 | return -ENODEV; | |
831 | } | |
118dd6bf | 832 | list_add(&mfile->list, &card->files_list); |
1da177e4 LT |
833 | spin_unlock(&card->files_lock); |
834 | return 0; | |
835 | } | |
836 | ||
c0d3fb39 TI |
837 | EXPORT_SYMBOL(snd_card_file_add); |
838 | ||
1da177e4 LT |
839 | /** |
840 | * snd_card_file_remove - remove the file from the file list | |
841 | * @card: soundcard structure | |
842 | * @file: file pointer | |
843 | * | |
844 | * This function removes the file formerly added to the card via | |
845 | * snd_card_file_add() function. | |
2b29b13c TI |
846 | * If all files are removed and snd_card_free_when_closed() was |
847 | * called beforehand, it processes the pending release of | |
848 | * resources. | |
1da177e4 LT |
849 | * |
850 | * Returns zero or a negative error code. | |
851 | */ | |
512bbd6a | 852 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 | 853 | { |
118dd6bf | 854 | struct snd_monitor_file *mfile, *found = NULL; |
c461482c | 855 | int last_close = 0; |
1da177e4 LT |
856 | |
857 | spin_lock(&card->files_lock); | |
118dd6bf | 858 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 | 859 | if (mfile->file == file) { |
118dd6bf TI |
860 | list_del(&mfile->list); |
861 | if (mfile->disconnected_f_op) | |
862 | fops_put(mfile->disconnected_f_op); | |
863 | found = mfile; | |
1da177e4 LT |
864 | break; |
865 | } | |
a9edfc60 | 866 | } |
118dd6bf | 867 | if (list_empty(&card->files_list)) |
c461482c TI |
868 | last_close = 1; |
869 | spin_unlock(&card->files_lock); | |
870 | if (last_close) { | |
1da177e4 | 871 | wake_up(&card->shutdown_sleep); |
c461482c TI |
872 | if (card->free_on_last_close) |
873 | snd_card_do_free(card); | |
874 | } | |
118dd6bf | 875 | if (!found) { |
1da177e4 LT |
876 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
877 | return -ENOENT; | |
878 | } | |
118dd6bf | 879 | kfree(found); |
1da177e4 LT |
880 | return 0; |
881 | } | |
882 | ||
c0d3fb39 TI |
883 | EXPORT_SYMBOL(snd_card_file_remove); |
884 | ||
1da177e4 LT |
885 | #ifdef CONFIG_PM |
886 | /** | |
887 | * snd_power_wait - wait until the power-state is changed. | |
888 | * @card: soundcard structure | |
889 | * @power_state: expected power state | |
1da177e4 LT |
890 | * |
891 | * Waits until the power-state is changed. | |
892 | * | |
893 | * Note: the power lock must be active before call. | |
894 | */ | |
cbac4b0c | 895 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
896 | { |
897 | wait_queue_t wait; | |
898 | int result = 0; | |
899 | ||
900 | /* fastpath */ | |
901 | if (snd_power_get_state(card) == power_state) | |
902 | return 0; | |
903 | init_waitqueue_entry(&wait, current); | |
904 | add_wait_queue(&card->power_sleep, &wait); | |
905 | while (1) { | |
906 | if (card->shutdown) { | |
907 | result = -ENODEV; | |
908 | break; | |
909 | } | |
910 | if (snd_power_get_state(card) == power_state) | |
911 | break; | |
1da177e4 LT |
912 | set_current_state(TASK_UNINTERRUPTIBLE); |
913 | snd_power_unlock(card); | |
914 | schedule_timeout(30 * HZ); | |
915 | snd_power_lock(card); | |
916 | } | |
917 | remove_wait_queue(&card->power_sleep, &wait); | |
918 | return result; | |
919 | } | |
920 | ||
c0d3fb39 | 921 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 922 | #endif /* CONFIG_PM */ |