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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> | |
da155d5b | 24 | #include <linux/module.h> |
1da177e4 LT |
25 | #include <linux/file.h> |
26 | #include <linux/slab.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/ctype.h> | |
1da177e4 | 29 | #include <linux/pm.h> |
d052d1be | 30 | |
1da177e4 LT |
31 | #include <sound/core.h> |
32 | #include <sound/control.h> | |
33 | #include <sound/info.h> | |
34 | ||
82a783f4 TI |
35 | /* monitor files for graceful shutdown (hotplug) */ |
36 | struct snd_monitor_file { | |
37 | struct file *file; | |
38 | const struct file_operations *disconnected_f_op; | |
39 | struct list_head shutdown_list; /* still need to shutdown */ | |
40 | struct list_head list; /* link of monitor files */ | |
41 | }; | |
42 | ||
a9edfc60 KW |
43 | static DEFINE_SPINLOCK(shutdown_lock); |
44 | static LIST_HEAD(shutdown_files); | |
45 | ||
9c2e08c5 | 46 | static const struct file_operations snd_shutdown_f_ops; |
1da177e4 | 47 | |
6581f4e7 TI |
48 | static unsigned int snd_cards_lock; /* locked for registering/using */ |
49 | struct snd_card *snd_cards[SNDRV_CARDS]; | |
c0d3fb39 TI |
50 | EXPORT_SYMBOL(snd_cards); |
51 | ||
746df948 | 52 | static DEFINE_MUTEX(snd_card_mutex); |
1da177e4 | 53 | |
304cd07f TI |
54 | static char *slots[SNDRV_CARDS]; |
55 | module_param_array(slots, charp, NULL, 0444); | |
56 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); | |
57 | ||
a93bbaa7 | 58 | /* return non-zero if the given index is reserved for the given |
304cd07f TI |
59 | * module via slots option |
60 | */ | |
a93bbaa7 | 61 | static int module_slot_match(struct module *module, int idx) |
304cd07f | 62 | { |
a93bbaa7 | 63 | int match = 1; |
304cd07f | 64 | #ifdef MODULE |
a93bbaa7 TI |
65 | const char *s1, *s2; |
66 | ||
304cd07f TI |
67 | if (!module || !module->name || !slots[idx]) |
68 | return 0; | |
a93bbaa7 TI |
69 | |
70 | s1 = module->name; | |
71 | s2 = slots[idx]; | |
72 | if (*s2 == '!') { | |
73 | match = 0; /* negative match */ | |
74 | s2++; | |
75 | } | |
304cd07f TI |
76 | /* compare module name strings |
77 | * hyphens are handled as equivalent with underscore | |
78 | */ | |
79 | for (;;) { | |
80 | char c1 = *s1++; | |
81 | char c2 = *s2++; | |
82 | if (c1 == '-') | |
83 | c1 = '_'; | |
84 | if (c2 == '-') | |
85 | c2 = '_'; | |
86 | if (c1 != c2) | |
a93bbaa7 | 87 | return !match; |
304cd07f TI |
88 | if (!c1) |
89 | break; | |
90 | } | |
a93bbaa7 TI |
91 | #endif /* MODULE */ |
92 | return match; | |
304cd07f TI |
93 | } |
94 | ||
1da177e4 | 95 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
512bbd6a | 96 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
c0d3fb39 | 97 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
98 | #endif |
99 | ||
e28563cc | 100 | #ifdef CONFIG_PROC_FS |
512bbd6a TI |
101 | static void snd_card_id_read(struct snd_info_entry *entry, |
102 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
103 | { |
104 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
105 | } | |
106 | ||
e28563cc TI |
107 | static inline int init_info_for_card(struct snd_card *card) |
108 | { | |
109 | int err; | |
110 | struct snd_info_entry *entry; | |
111 | ||
112 | if ((err = snd_info_card_register(card)) < 0) { | |
113 | snd_printd("unable to create card info\n"); | |
114 | return err; | |
115 | } | |
116 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
117 | snd_printd("unable to create card entry\n"); | |
118 | return err; | |
119 | } | |
e28563cc TI |
120 | entry->c.text.read = snd_card_id_read; |
121 | if (snd_info_register(entry) < 0) { | |
122 | snd_info_free_entry(entry); | |
123 | entry = NULL; | |
124 | } | |
125 | card->proc_id = entry; | |
126 | return 0; | |
127 | } | |
128 | #else /* !CONFIG_PROC_FS */ | |
129 | #define init_info_for_card(card) | |
130 | #endif | |
131 | ||
1da177e4 | 132 | /** |
53fb1e63 | 133 | * snd_card_create - create and initialize a soundcard structure |
1da177e4 LT |
134 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
135 | * @xid: card identification (ASCII string) | |
136 | * @module: top level module for locking | |
137 | * @extra_size: allocate this extra size after the main soundcard structure | |
53fb1e63 | 138 | * @card_ret: the pointer to store the created card instance |
1da177e4 LT |
139 | * |
140 | * Creates and initializes a soundcard structure. | |
141 | * | |
53fb1e63 TI |
142 | * The function allocates snd_card instance via kzalloc with the given |
143 | * space for the driver to use freely. The allocated struct is stored | |
144 | * in the given card_ret pointer. | |
145 | * | |
146 | * Returns zero if successful or a negative error code. | |
1da177e4 | 147 | */ |
53fb1e63 TI |
148 | int snd_card_create(int idx, const char *xid, |
149 | struct module *module, int extra_size, | |
150 | struct snd_card **card_ret) | |
1da177e4 | 151 | { |
512bbd6a | 152 | struct snd_card *card; |
a93bbaa7 | 153 | int err, idx2; |
1da177e4 | 154 | |
53fb1e63 TI |
155 | if (snd_BUG_ON(!card_ret)) |
156 | return -EINVAL; | |
157 | *card_ret = NULL; | |
158 | ||
1da177e4 LT |
159 | if (extra_size < 0) |
160 | extra_size = 0; | |
ca2c0966 | 161 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
53fb1e63 TI |
162 | if (!card) |
163 | return -ENOMEM; | |
10a8ebbb | 164 | if (xid) |
5fdc18d9 | 165 | strlcpy(card->id, xid, sizeof(card->id)); |
1da177e4 | 166 | err = 0; |
746df948 | 167 | mutex_lock(&snd_card_mutex); |
1da177e4 | 168 | if (idx < 0) { |
1da177e4 | 169 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
5c33dd70 | 170 | /* idx == -1 == 0xffff means: take any free slot */ |
1da177e4 | 171 | if (~snd_cards_lock & idx & 1<<idx2) { |
a93bbaa7 TI |
172 | if (module_slot_match(module, idx2)) { |
173 | idx = idx2; | |
174 | break; | |
175 | } | |
176 | } | |
177 | } | |
178 | if (idx < 0) { | |
179 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
180 | /* idx == -1 == 0xffff means: take any free slot */ | |
181 | if (~snd_cards_lock & idx & 1<<idx2) { | |
182 | if (!slots[idx2] || !*slots[idx2]) { | |
183 | idx = idx2; | |
184 | break; | |
185 | } | |
1da177e4 | 186 | } |
5c33dd70 | 187 | } |
a93bbaa7 TI |
188 | if (idx < 0) |
189 | err = -ENODEV; | |
190 | else if (idx < snd_ecards_limit) { | |
191 | if (snd_cards_lock & (1 << idx)) | |
192 | err = -EBUSY; /* invalid */ | |
193 | } else if (idx >= SNDRV_CARDS) | |
194 | err = -ENODEV; | |
195 | if (err < 0) { | |
746df948 | 196 | mutex_unlock(&snd_card_mutex); |
5c33dd70 ON |
197 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
198 | idx, snd_ecards_limit - 1, err); | |
1da177e4 LT |
199 | goto __error; |
200 | } | |
201 | snd_cards_lock |= 1 << idx; /* lock it */ | |
a93bbaa7 TI |
202 | if (idx >= snd_ecards_limit) |
203 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
746df948 | 204 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
205 | card->number = idx; |
206 | card->module = module; | |
207 | INIT_LIST_HEAD(&card->devices); | |
208 | init_rwsem(&card->controls_rwsem); | |
209 | rwlock_init(&card->ctl_files_rwlock); | |
210 | INIT_LIST_HEAD(&card->controls); | |
211 | INIT_LIST_HEAD(&card->ctl_files); | |
212 | spin_lock_init(&card->files_lock); | |
118dd6bf | 213 | INIT_LIST_HEAD(&card->files_list); |
1da177e4 | 214 | init_waitqueue_head(&card->shutdown_sleep); |
1da177e4 | 215 | #ifdef CONFIG_PM |
1a60d4c5 | 216 | mutex_init(&card->power_lock); |
1da177e4 LT |
217 | init_waitqueue_head(&card->power_sleep); |
218 | #endif | |
219 | /* the control interface cannot be accessed from the user space until */ | |
220 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
221 | err = snd_ctl_create(card); |
222 | if (err < 0) { | |
223 | snd_printk(KERN_ERR "unable to register control minors\n"); | |
1da177e4 LT |
224 | goto __error; |
225 | } | |
53fb1e63 TI |
226 | err = snd_info_card_create(card); |
227 | if (err < 0) { | |
228 | snd_printk(KERN_ERR "unable to create card info\n"); | |
1da177e4 LT |
229 | goto __error_ctl; |
230 | } | |
231 | if (extra_size > 0) | |
512bbd6a | 232 | card->private_data = (char *)card + sizeof(struct snd_card); |
53fb1e63 TI |
233 | *card_ret = card; |
234 | return 0; | |
1da177e4 LT |
235 | |
236 | __error_ctl: | |
237 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
238 | __error: | |
239 | kfree(card); | |
53fb1e63 | 240 | return err; |
1da177e4 | 241 | } |
53fb1e63 | 242 | EXPORT_SYMBOL(snd_card_create); |
c0d3fb39 | 243 | |
746df948 TI |
244 | /* return non-zero if a card is already locked */ |
245 | int snd_card_locked(int card) | |
246 | { | |
247 | int locked; | |
248 | ||
249 | mutex_lock(&snd_card_mutex); | |
250 | locked = snd_cards_lock & (1 << card); | |
251 | mutex_unlock(&snd_card_mutex); | |
252 | return locked; | |
253 | } | |
254 | ||
b3b0abe1 CL |
255 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
256 | { | |
257 | return -ENODEV; | |
258 | } | |
259 | ||
260 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
261 | size_t count, loff_t *offset) | |
262 | { | |
263 | return -ENODEV; | |
264 | } | |
265 | ||
266 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
267 | size_t count, loff_t *offset) | |
268 | { | |
269 | return -ENODEV; | |
270 | } | |
271 | ||
a9edfc60 KW |
272 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
273 | { | |
274 | struct snd_monitor_file *df = NULL, *_df; | |
275 | ||
276 | spin_lock(&shutdown_lock); | |
277 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
278 | if (_df->file == file) { | |
279 | df = _df; | |
118dd6bf | 280 | list_del_init(&df->shutdown_list); |
a9edfc60 KW |
281 | break; |
282 | } | |
283 | } | |
284 | spin_unlock(&shutdown_lock); | |
285 | ||
233e70f4 AV |
286 | if (likely(df)) { |
287 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
288 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 289 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 290 | } |
a9edfc60 | 291 | |
9bf8e7dd | 292 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
293 | } |
294 | ||
1da177e4 LT |
295 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
296 | { | |
297 | return POLLERR | POLLNVAL; | |
298 | } | |
299 | ||
b3b0abe1 CL |
300 | static long snd_disconnect_ioctl(struct file *file, |
301 | unsigned int cmd, unsigned long arg) | |
302 | { | |
303 | return -ENODEV; | |
304 | } | |
305 | ||
306 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
307 | { | |
308 | return -ENODEV; | |
309 | } | |
310 | ||
311 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
312 | { | |
313 | return -ENODEV; | |
314 | } | |
315 | ||
9c2e08c5 | 316 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
317 | { |
318 | .owner = THIS_MODULE, | |
319 | .llseek = snd_disconnect_llseek, | |
320 | .read = snd_disconnect_read, | |
321 | .write = snd_disconnect_write, | |
322 | .release = snd_disconnect_release, | |
323 | .poll = snd_disconnect_poll, | |
324 | .unlocked_ioctl = snd_disconnect_ioctl, | |
325 | #ifdef CONFIG_COMPAT | |
326 | .compat_ioctl = snd_disconnect_ioctl, | |
327 | #endif | |
328 | .mmap = snd_disconnect_mmap, | |
329 | .fasync = snd_disconnect_fasync | |
330 | }; | |
331 | ||
1da177e4 LT |
332 | /** |
333 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
334 | * @card: soundcard structure | |
335 | * | |
336 | * Disconnects all APIs from the file-operations (user space). | |
337 | * | |
338 | * Returns zero, otherwise a negative error code. | |
339 | * | |
340 | * Note: The current implementation replaces all active file->f_op with special | |
341 | * dummy file operations (they do nothing except release). | |
342 | */ | |
512bbd6a | 343 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
344 | { |
345 | struct snd_monitor_file *mfile; | |
1da177e4 LT |
346 | int err; |
347 | ||
f18638dc TI |
348 | if (!card) |
349 | return -EINVAL; | |
350 | ||
1da177e4 LT |
351 | spin_lock(&card->files_lock); |
352 | if (card->shutdown) { | |
353 | spin_unlock(&card->files_lock); | |
354 | return 0; | |
355 | } | |
356 | card->shutdown = 1; | |
357 | spin_unlock(&card->files_lock); | |
358 | ||
359 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 360 | mutex_lock(&snd_card_mutex); |
1da177e4 | 361 | snd_cards[card->number] = NULL; |
f18638dc | 362 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 363 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
364 | |
365 | /* phase 2: replace file->f_op with special dummy operations */ | |
366 | ||
367 | spin_lock(&card->files_lock); | |
118dd6bf | 368 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 LT |
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 | spin_unlock(&card->files_lock); | |
381 | ||
382 | /* phase 3: notify all connected devices about disconnection */ | |
383 | /* at this point, they cannot respond to any calls except release() */ | |
384 | ||
385 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
386 | if (snd_mixer_oss_notify_callback) | |
387 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
388 | #endif | |
389 | ||
390 | /* notify all devices that we are disconnected */ | |
391 | err = snd_device_disconnect_all(card); | |
392 | if (err < 0) | |
393 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
394 | ||
746d4a02 | 395 | snd_info_card_disconnect(card); |
73d38b13 TI |
396 | if (card->card_dev) { |
397 | device_unregister(card->card_dev); | |
398 | card->card_dev = NULL; | |
399 | } | |
f18638dc TI |
400 | #ifdef CONFIG_PM |
401 | wake_up(&card->power_sleep); | |
73d38b13 | 402 | #endif |
1da177e4 LT |
403 | return 0; |
404 | } | |
405 | ||
c0d3fb39 TI |
406 | EXPORT_SYMBOL(snd_card_disconnect); |
407 | ||
1da177e4 LT |
408 | /** |
409 | * snd_card_free - frees given soundcard structure | |
410 | * @card: soundcard structure | |
411 | * | |
412 | * This function releases the soundcard structure and the all assigned | |
413 | * devices automatically. That is, you don't have to release the devices | |
414 | * by yourself. | |
415 | * | |
416 | * Returns zero. Frees all associated devices and frees the control | |
417 | * interface associated to given soundcard. | |
418 | */ | |
c461482c | 419 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 420 | { |
1da177e4 LT |
421 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
422 | if (snd_mixer_oss_notify_callback) | |
423 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
424 | #endif | |
425 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
426 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
427 | /* Fatal, but this situation should never occur */ | |
428 | } | |
429 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
430 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
431 | /* Fatal, but this situation should never occur */ | |
432 | } | |
433 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
434 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
435 | /* Fatal, but this situation should never occur */ | |
436 | } | |
437 | if (card->private_free) | |
438 | card->private_free(card); | |
746d4a02 | 439 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
440 | if (snd_info_card_free(card) < 0) { |
441 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
442 | /* Not fatal error */ | |
443 | } | |
c461482c TI |
444 | kfree(card); |
445 | return 0; | |
446 | } | |
447 | ||
c461482c TI |
448 | int snd_card_free_when_closed(struct snd_card *card) |
449 | { | |
450 | int free_now = 0; | |
f18638dc | 451 | int ret = snd_card_disconnect(card); |
c461482c TI |
452 | if (ret) |
453 | return ret; | |
454 | ||
455 | spin_lock(&card->files_lock); | |
118dd6bf | 456 | if (list_empty(&card->files_list)) |
c461482c TI |
457 | free_now = 1; |
458 | else | |
459 | card->free_on_last_close = 1; | |
460 | spin_unlock(&card->files_lock); | |
461 | ||
462 | if (free_now) | |
463 | snd_card_do_free(card); | |
464 | return 0; | |
465 | } | |
466 | ||
467 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
468 | ||
469 | int snd_card_free(struct snd_card *card) | |
470 | { | |
f18638dc | 471 | int ret = snd_card_disconnect(card); |
c461482c TI |
472 | if (ret) |
473 | return ret; | |
474 | ||
475 | /* wait, until all devices are ready for the free operation */ | |
118dd6bf | 476 | wait_event(card->shutdown_sleep, list_empty(&card->files_list)); |
c461482c | 477 | snd_card_do_free(card); |
1da177e4 LT |
478 | return 0; |
479 | } | |
480 | ||
c0d3fb39 TI |
481 | EXPORT_SYMBOL(snd_card_free); |
482 | ||
5fdc18d9 | 483 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *nid) |
1da177e4 | 484 | { |
d001544d | 485 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
10a8ebbb JK |
486 | const char *spos, *src; |
487 | char *id; | |
1da177e4 | 488 | |
10a8ebbb JK |
489 | if (nid == NULL) { |
490 | id = card->shortname; | |
491 | spos = src = id; | |
492 | while (*id != '\0') { | |
493 | if (*id == ' ') | |
494 | spos = id + 1; | |
495 | id++; | |
496 | } | |
497 | } else { | |
498 | spos = src = nid; | |
1da177e4 LT |
499 | } |
500 | id = card->id; | |
501 | while (*spos != '\0' && !isalnum(*spos)) | |
502 | spos++; | |
503 | if (isdigit(*spos)) | |
10a8ebbb | 504 | *id++ = isalpha(src[0]) ? src[0] : 'D'; |
1da177e4 LT |
505 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { |
506 | if (isalnum(*spos)) | |
507 | *id++ = *spos; | |
508 | spos++; | |
509 | } | |
510 | *id = '\0'; | |
511 | ||
512 | id = card->id; | |
513 | ||
514 | if (*id == '\0') | |
d8e4f9ae | 515 | strcpy(id, "Default"); |
1da177e4 LT |
516 | |
517 | while (1) { | |
518 | if (loops-- == 0) { | |
10a8ebbb | 519 | snd_printk(KERN_ERR "unable to set card id (%s)\n", id); |
1da177e4 LT |
520 | strcpy(card->id, card->proc_root->name); |
521 | return; | |
522 | } | |
523 | if (!snd_info_check_reserved_words(id)) | |
524 | goto __change; | |
525 | for (i = 0; i < snd_ecards_limit; i++) { | |
5fdc18d9 | 526 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) |
1da177e4 LT |
527 | goto __change; |
528 | } | |
529 | break; | |
530 | ||
531 | __change: | |
532 | len = strlen(id); | |
d001544d CL |
533 | if (idx_flag) { |
534 | if (id[len-1] != '9') | |
535 | id[len-1]++; | |
536 | else | |
537 | id[len-1] = 'A'; | |
538 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
539 | strcat(id, "_1"); |
540 | idx_flag++; | |
541 | } else { | |
542 | spos = id + len - 2; | |
543 | if ((size_t)len <= sizeof(card->id) - 2) | |
544 | spos++; | |
10a8ebbb JK |
545 | *(char *)spos++ = '_'; |
546 | *(char *)spos++ = '1'; | |
547 | *(char *)spos++ = '\0'; | |
1da177e4 LT |
548 | idx_flag++; |
549 | } | |
550 | } | |
551 | } | |
552 | ||
872c7820 MB |
553 | /** |
554 | * snd_card_set_id - set card identification name | |
555 | * @card: soundcard structure | |
556 | * @nid: new identification string | |
557 | * | |
558 | * This function sets the card identification and checks for name | |
559 | * collisions. | |
560 | */ | |
561 | void snd_card_set_id(struct snd_card *card, const char *nid) | |
562 | { | |
5fdc18d9 JK |
563 | /* check if user specified own card->id */ |
564 | if (card->id[0] != '\0') | |
565 | return; | |
566 | mutex_lock(&snd_card_mutex); | |
567 | snd_card_set_id_no_lock(card, nid); | |
568 | mutex_unlock(&snd_card_mutex); | |
872c7820 | 569 | } |
10a8ebbb JK |
570 | EXPORT_SYMBOL(snd_card_set_id); |
571 | ||
9fb6198e JK |
572 | static ssize_t |
573 | card_id_show_attr(struct device *dev, | |
574 | struct device_attribute *attr, char *buf) | |
575 | { | |
576 | struct snd_card *card = dev_get_drvdata(dev); | |
577 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); | |
578 | } | |
579 | ||
580 | static ssize_t | |
581 | card_id_store_attr(struct device *dev, struct device_attribute *attr, | |
582 | const char *buf, size_t count) | |
583 | { | |
584 | struct snd_card *card = dev_get_drvdata(dev); | |
585 | char buf1[sizeof(card->id)]; | |
586 | size_t copy = count > sizeof(card->id) - 1 ? | |
587 | sizeof(card->id) - 1 : count; | |
588 | size_t idx; | |
589 | int c; | |
590 | ||
591 | for (idx = 0; idx < copy; idx++) { | |
592 | c = buf[idx]; | |
593 | if (!isalnum(c) && c != '_' && c != '-') | |
594 | return -EINVAL; | |
595 | } | |
596 | memcpy(buf1, buf, copy); | |
597 | buf1[copy] = '\0'; | |
598 | mutex_lock(&snd_card_mutex); | |
599 | if (!snd_info_check_reserved_words(buf1)) { | |
600 | __exist: | |
601 | mutex_unlock(&snd_card_mutex); | |
602 | return -EEXIST; | |
603 | } | |
604 | for (idx = 0; idx < snd_ecards_limit; idx++) { | |
4437ecdc PU |
605 | if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) { |
606 | if (card == snd_cards[idx]) | |
607 | goto __ok; | |
608 | else | |
609 | goto __exist; | |
610 | } | |
9fb6198e JK |
611 | } |
612 | strcpy(card->id, buf1); | |
c2eb9c4e | 613 | snd_info_card_id_change(card); |
4437ecdc | 614 | __ok: |
9fb6198e JK |
615 | mutex_unlock(&snd_card_mutex); |
616 | ||
617 | return count; | |
618 | } | |
619 | ||
620 | static struct device_attribute card_id_attrs = | |
621 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); | |
622 | ||
623 | static ssize_t | |
624 | card_number_show_attr(struct device *dev, | |
625 | struct device_attribute *attr, char *buf) | |
626 | { | |
627 | struct snd_card *card = dev_get_drvdata(dev); | |
628 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); | |
629 | } | |
630 | ||
631 | static struct device_attribute card_number_attrs = | |
632 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); | |
9fb6198e | 633 | |
1da177e4 LT |
634 | /** |
635 | * snd_card_register - register the soundcard | |
636 | * @card: soundcard structure | |
637 | * | |
638 | * This function registers all the devices assigned to the soundcard. | |
639 | * Until calling this, the ALSA control interface is blocked from the | |
640 | * external accesses. Thus, you should call this function at the end | |
641 | * of the initialization of the card. | |
642 | * | |
b595076a | 643 | * Returns zero otherwise a negative error code if the registration failed. |
1da177e4 | 644 | */ |
512bbd6a | 645 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
646 | { |
647 | int err; | |
1da177e4 | 648 | |
7eaa943c TI |
649 | if (snd_BUG_ON(!card)) |
650 | return -EINVAL; | |
39aba963 | 651 | |
7d2aae1e | 652 | if (!card->card_dev) { |
abe9ab8f | 653 | card->card_dev = device_create(sound_class, card->dev, |
9fb6198e | 654 | MKDEV(0, 0), card, |
abe9ab8f | 655 | "card%i", card->number); |
7d2aae1e TI |
656 | if (IS_ERR(card->card_dev)) |
657 | card->card_dev = NULL; | |
d80f19fa | 658 | } |
39aba963 | 659 | |
1da177e4 LT |
660 | if ((err = snd_device_register_all(card)) < 0) |
661 | return err; | |
746df948 | 662 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
663 | if (snd_cards[card->number]) { |
664 | /* already registered */ | |
746df948 | 665 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
666 | return 0; |
667 | } | |
5fdc18d9 | 668 | snd_card_set_id_no_lock(card, card->id[0] == '\0' ? NULL : card->id); |
1da177e4 | 669 | snd_cards[card->number] = card; |
746df948 | 670 | mutex_unlock(&snd_card_mutex); |
e28563cc | 671 | init_info_for_card(card); |
1da177e4 LT |
672 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
673 | if (snd_mixer_oss_notify_callback) | |
674 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e | 675 | #endif |
9fb6198e | 676 | if (card->card_dev) { |
2af75293 HE |
677 | err = device_create_file(card->card_dev, &card_id_attrs); |
678 | if (err < 0) | |
679 | return err; | |
680 | err = device_create_file(card->card_dev, &card_number_attrs); | |
681 | if (err < 0) | |
682 | return err; | |
9fb6198e | 683 | } |
39aba963 | 684 | |
1da177e4 LT |
685 | return 0; |
686 | } | |
687 | ||
c0d3fb39 TI |
688 | EXPORT_SYMBOL(snd_card_register); |
689 | ||
e28563cc | 690 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 691 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 692 | |
a381a7a6 TI |
693 | static void snd_card_info_read(struct snd_info_entry *entry, |
694 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
695 | { |
696 | int idx, count; | |
512bbd6a | 697 | struct snd_card *card; |
1da177e4 LT |
698 | |
699 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 700 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
701 | if ((card = snd_cards[idx]) != NULL) { |
702 | count++; | |
d001544d | 703 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
704 | idx, |
705 | card->id, | |
706 | card->driver, | |
707 | card->shortname); | |
d001544d | 708 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
709 | card->longname); |
710 | } | |
746df948 | 711 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
712 | } |
713 | if (!count) | |
714 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
715 | } | |
716 | ||
e28563cc | 717 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 718 | |
512bbd6a | 719 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
720 | { |
721 | int idx, count; | |
512bbd6a | 722 | struct snd_card *card; |
1da177e4 LT |
723 | |
724 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 725 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
726 | if ((card = snd_cards[idx]) != NULL) { |
727 | count++; | |
728 | snd_iprintf(buffer, "%s\n", card->longname); | |
729 | } | |
746df948 | 730 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
731 | } |
732 | if (!count) { | |
733 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
734 | } | |
735 | } | |
736 | ||
737 | #endif | |
738 | ||
739 | #ifdef MODULE | |
512bbd6a TI |
740 | static struct snd_info_entry *snd_card_module_info_entry; |
741 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
742 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
743 | { |
744 | int idx; | |
512bbd6a | 745 | struct snd_card *card; |
1da177e4 LT |
746 | |
747 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 748 | mutex_lock(&snd_card_mutex); |
1da177e4 | 749 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
750 | snd_iprintf(buffer, "%2i %s\n", |
751 | idx, card->module->name); | |
746df948 | 752 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
753 | } |
754 | } | |
755 | #endif | |
756 | ||
757 | int __init snd_card_info_init(void) | |
758 | { | |
512bbd6a | 759 | struct snd_info_entry *entry; |
1da177e4 LT |
760 | |
761 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
762 | if (! entry) |
763 | return -ENOMEM; | |
1da177e4 LT |
764 | entry->c.text.read = snd_card_info_read; |
765 | if (snd_info_register(entry) < 0) { | |
766 | snd_info_free_entry(entry); | |
767 | return -ENOMEM; | |
768 | } | |
769 | snd_card_info_entry = entry; | |
770 | ||
771 | #ifdef MODULE | |
772 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
773 | if (entry) { | |
1da177e4 LT |
774 | entry->c.text.read = snd_card_module_info_read; |
775 | if (snd_info_register(entry) < 0) | |
776 | snd_info_free_entry(entry); | |
777 | else | |
778 | snd_card_module_info_entry = entry; | |
779 | } | |
780 | #endif | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
785 | int __exit snd_card_info_done(void) | |
786 | { | |
746d4a02 | 787 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 788 | #ifdef MODULE |
746d4a02 | 789 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
790 | #endif |
791 | return 0; | |
792 | } | |
793 | ||
e28563cc TI |
794 | #endif /* CONFIG_PROC_FS */ |
795 | ||
1da177e4 LT |
796 | /** |
797 | * snd_component_add - add a component string | |
798 | * @card: soundcard structure | |
799 | * @component: the component id string | |
800 | * | |
801 | * This function adds the component id string to the supported list. | |
802 | * The component can be referred from the alsa-lib. | |
803 | * | |
804 | * Returns zero otherwise a negative error code. | |
805 | */ | |
806 | ||
512bbd6a | 807 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
808 | { |
809 | char *ptr; | |
810 | int len = strlen(component); | |
811 | ||
812 | ptr = strstr(card->components, component); | |
813 | if (ptr != NULL) { | |
814 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
815 | return 1; | |
816 | } | |
817 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
818 | snd_BUG(); | |
819 | return -ENOMEM; | |
820 | } | |
821 | if (card->components[0] != '\0') | |
822 | strcat(card->components, " "); | |
823 | strcat(card->components, component); | |
824 | return 0; | |
825 | } | |
826 | ||
c0d3fb39 TI |
827 | EXPORT_SYMBOL(snd_component_add); |
828 | ||
1da177e4 LT |
829 | /** |
830 | * snd_card_file_add - add the file to the file list of the card | |
831 | * @card: soundcard structure | |
832 | * @file: file pointer | |
833 | * | |
834 | * This function adds the file to the file linked-list of the card. | |
835 | * This linked-list is used to keep tracking the connection state, | |
836 | * and to avoid the release of busy resources by hotplug. | |
837 | * | |
838 | * Returns zero or a negative error code. | |
839 | */ | |
512bbd6a | 840 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
841 | { |
842 | struct snd_monitor_file *mfile; | |
843 | ||
844 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
845 | if (mfile == NULL) | |
846 | return -ENOMEM; | |
847 | mfile->file = file; | |
a9edfc60 | 848 | mfile->disconnected_f_op = NULL; |
a45e3d6b | 849 | INIT_LIST_HEAD(&mfile->shutdown_list); |
1da177e4 LT |
850 | spin_lock(&card->files_lock); |
851 | if (card->shutdown) { | |
852 | spin_unlock(&card->files_lock); | |
853 | kfree(mfile); | |
854 | return -ENODEV; | |
855 | } | |
118dd6bf | 856 | list_add(&mfile->list, &card->files_list); |
1da177e4 LT |
857 | spin_unlock(&card->files_lock); |
858 | return 0; | |
859 | } | |
860 | ||
c0d3fb39 TI |
861 | EXPORT_SYMBOL(snd_card_file_add); |
862 | ||
1da177e4 LT |
863 | /** |
864 | * snd_card_file_remove - remove the file from the file list | |
865 | * @card: soundcard structure | |
866 | * @file: file pointer | |
867 | * | |
868 | * This function removes the file formerly added to the card via | |
869 | * snd_card_file_add() function. | |
2b29b13c TI |
870 | * If all files are removed and snd_card_free_when_closed() was |
871 | * called beforehand, it processes the pending release of | |
872 | * resources. | |
1da177e4 LT |
873 | * |
874 | * Returns zero or a negative error code. | |
875 | */ | |
512bbd6a | 876 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 | 877 | { |
118dd6bf | 878 | struct snd_monitor_file *mfile, *found = NULL; |
c461482c | 879 | int last_close = 0; |
1da177e4 LT |
880 | |
881 | spin_lock(&card->files_lock); | |
118dd6bf | 882 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 | 883 | if (mfile->file == file) { |
118dd6bf | 884 | list_del(&mfile->list); |
a45e3d6b TI |
885 | spin_lock(&shutdown_lock); |
886 | list_del(&mfile->shutdown_list); | |
887 | spin_unlock(&shutdown_lock); | |
118dd6bf TI |
888 | if (mfile->disconnected_f_op) |
889 | fops_put(mfile->disconnected_f_op); | |
890 | found = mfile; | |
1da177e4 LT |
891 | break; |
892 | } | |
a9edfc60 | 893 | } |
118dd6bf | 894 | if (list_empty(&card->files_list)) |
c461482c TI |
895 | last_close = 1; |
896 | spin_unlock(&card->files_lock); | |
897 | if (last_close) { | |
1da177e4 | 898 | wake_up(&card->shutdown_sleep); |
c461482c TI |
899 | if (card->free_on_last_close) |
900 | snd_card_do_free(card); | |
901 | } | |
118dd6bf | 902 | if (!found) { |
1da177e4 LT |
903 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
904 | return -ENOENT; | |
905 | } | |
118dd6bf | 906 | kfree(found); |
1da177e4 LT |
907 | return 0; |
908 | } | |
909 | ||
c0d3fb39 TI |
910 | EXPORT_SYMBOL(snd_card_file_remove); |
911 | ||
1da177e4 LT |
912 | #ifdef CONFIG_PM |
913 | /** | |
914 | * snd_power_wait - wait until the power-state is changed. | |
915 | * @card: soundcard structure | |
916 | * @power_state: expected power state | |
1da177e4 LT |
917 | * |
918 | * Waits until the power-state is changed. | |
919 | * | |
920 | * Note: the power lock must be active before call. | |
921 | */ | |
cbac4b0c | 922 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
923 | { |
924 | wait_queue_t wait; | |
925 | int result = 0; | |
926 | ||
927 | /* fastpath */ | |
928 | if (snd_power_get_state(card) == power_state) | |
929 | return 0; | |
930 | init_waitqueue_entry(&wait, current); | |
931 | add_wait_queue(&card->power_sleep, &wait); | |
932 | while (1) { | |
933 | if (card->shutdown) { | |
934 | result = -ENODEV; | |
935 | break; | |
936 | } | |
937 | if (snd_power_get_state(card) == power_state) | |
938 | break; | |
1da177e4 LT |
939 | set_current_state(TASK_UNINTERRUPTIBLE); |
940 | snd_power_unlock(card); | |
941 | schedule_timeout(30 * HZ); | |
942 | snd_power_lock(card); | |
943 | } | |
944 | remove_wait_queue(&card->power_sleep, &wait); | |
945 | return result; | |
946 | } | |
947 | ||
c0d3fb39 | 948 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 949 | #endif /* CONFIG_PM */ |