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 | ||
82a783f4 TI |
34 | /* monitor files for graceful shutdown (hotplug) */ |
35 | struct snd_monitor_file { | |
36 | struct file *file; | |
37 | const struct file_operations *disconnected_f_op; | |
38 | struct list_head shutdown_list; /* still need to shutdown */ | |
39 | struct list_head list; /* link of monitor files */ | |
40 | }; | |
41 | ||
a9edfc60 KW |
42 | static DEFINE_SPINLOCK(shutdown_lock); |
43 | static LIST_HEAD(shutdown_files); | |
44 | ||
9c2e08c5 | 45 | static const struct file_operations snd_shutdown_f_ops; |
1da177e4 | 46 | |
6581f4e7 TI |
47 | static unsigned int snd_cards_lock; /* locked for registering/using */ |
48 | struct snd_card *snd_cards[SNDRV_CARDS]; | |
c0d3fb39 TI |
49 | EXPORT_SYMBOL(snd_cards); |
50 | ||
746df948 | 51 | static DEFINE_MUTEX(snd_card_mutex); |
1da177e4 | 52 | |
304cd07f TI |
53 | static char *slots[SNDRV_CARDS]; |
54 | module_param_array(slots, charp, NULL, 0444); | |
55 | MODULE_PARM_DESC(slots, "Module names assigned to the slots."); | |
56 | ||
a93bbaa7 | 57 | /* return non-zero if the given index is reserved for the given |
304cd07f TI |
58 | * module via slots option |
59 | */ | |
a93bbaa7 | 60 | static int module_slot_match(struct module *module, int idx) |
304cd07f | 61 | { |
a93bbaa7 | 62 | int match = 1; |
304cd07f | 63 | #ifdef MODULE |
a93bbaa7 TI |
64 | const char *s1, *s2; |
65 | ||
304cd07f TI |
66 | if (!module || !module->name || !slots[idx]) |
67 | return 0; | |
a93bbaa7 TI |
68 | |
69 | s1 = module->name; | |
70 | s2 = slots[idx]; | |
71 | if (*s2 == '!') { | |
72 | match = 0; /* negative match */ | |
73 | s2++; | |
74 | } | |
304cd07f TI |
75 | /* compare module name strings |
76 | * hyphens are handled as equivalent with underscore | |
77 | */ | |
78 | for (;;) { | |
79 | char c1 = *s1++; | |
80 | char c2 = *s2++; | |
81 | if (c1 == '-') | |
82 | c1 = '_'; | |
83 | if (c2 == '-') | |
84 | c2 = '_'; | |
85 | if (c1 != c2) | |
a93bbaa7 | 86 | return !match; |
304cd07f TI |
87 | if (!c1) |
88 | break; | |
89 | } | |
a93bbaa7 TI |
90 | #endif /* MODULE */ |
91 | return match; | |
304cd07f TI |
92 | } |
93 | ||
1da177e4 | 94 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
512bbd6a | 95 | int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag); |
c0d3fb39 | 96 | EXPORT_SYMBOL(snd_mixer_oss_notify_callback); |
1da177e4 LT |
97 | #endif |
98 | ||
e28563cc | 99 | #ifdef CONFIG_PROC_FS |
512bbd6a TI |
100 | static void snd_card_id_read(struct snd_info_entry *entry, |
101 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
102 | { |
103 | snd_iprintf(buffer, "%s\n", entry->card->id); | |
104 | } | |
105 | ||
e28563cc TI |
106 | static inline int init_info_for_card(struct snd_card *card) |
107 | { | |
108 | int err; | |
109 | struct snd_info_entry *entry; | |
110 | ||
111 | if ((err = snd_info_card_register(card)) < 0) { | |
112 | snd_printd("unable to create card info\n"); | |
113 | return err; | |
114 | } | |
115 | if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { | |
116 | snd_printd("unable to create card entry\n"); | |
117 | return err; | |
118 | } | |
e28563cc TI |
119 | entry->c.text.read = snd_card_id_read; |
120 | if (snd_info_register(entry) < 0) { | |
121 | snd_info_free_entry(entry); | |
122 | entry = NULL; | |
123 | } | |
124 | card->proc_id = entry; | |
125 | return 0; | |
126 | } | |
127 | #else /* !CONFIG_PROC_FS */ | |
128 | #define init_info_for_card(card) | |
129 | #endif | |
130 | ||
1da177e4 | 131 | /** |
53fb1e63 | 132 | * snd_card_create - create and initialize a soundcard structure |
1da177e4 LT |
133 | * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] |
134 | * @xid: card identification (ASCII string) | |
135 | * @module: top level module for locking | |
136 | * @extra_size: allocate this extra size after the main soundcard structure | |
53fb1e63 | 137 | * @card_ret: the pointer to store the created card instance |
1da177e4 LT |
138 | * |
139 | * Creates and initializes a soundcard structure. | |
140 | * | |
53fb1e63 TI |
141 | * The function allocates snd_card instance via kzalloc with the given |
142 | * space for the driver to use freely. The allocated struct is stored | |
143 | * in the given card_ret pointer. | |
144 | * | |
145 | * Returns zero if successful or a negative error code. | |
1da177e4 | 146 | */ |
53fb1e63 TI |
147 | int snd_card_create(int idx, const char *xid, |
148 | struct module *module, int extra_size, | |
149 | struct snd_card **card_ret) | |
1da177e4 | 150 | { |
512bbd6a | 151 | struct snd_card *card; |
a93bbaa7 | 152 | int err, idx2; |
1da177e4 | 153 | |
53fb1e63 TI |
154 | if (snd_BUG_ON(!card_ret)) |
155 | return -EINVAL; | |
156 | *card_ret = NULL; | |
157 | ||
1da177e4 LT |
158 | if (extra_size < 0) |
159 | extra_size = 0; | |
ca2c0966 | 160 | card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); |
53fb1e63 TI |
161 | if (!card) |
162 | return -ENOMEM; | |
10a8ebbb | 163 | if (xid) |
5fdc18d9 | 164 | strlcpy(card->id, xid, sizeof(card->id)); |
1da177e4 | 165 | err = 0; |
746df948 | 166 | mutex_lock(&snd_card_mutex); |
1da177e4 | 167 | if (idx < 0) { |
1da177e4 | 168 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
5c33dd70 | 169 | /* idx == -1 == 0xffff means: take any free slot */ |
1da177e4 | 170 | if (~snd_cards_lock & idx & 1<<idx2) { |
a93bbaa7 TI |
171 | if (module_slot_match(module, idx2)) { |
172 | idx = idx2; | |
173 | break; | |
174 | } | |
175 | } | |
176 | } | |
177 | if (idx < 0) { | |
178 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
179 | /* idx == -1 == 0xffff means: take any free slot */ | |
180 | if (~snd_cards_lock & idx & 1<<idx2) { | |
181 | if (!slots[idx2] || !*slots[idx2]) { | |
182 | idx = idx2; | |
183 | break; | |
184 | } | |
1da177e4 | 185 | } |
5c33dd70 | 186 | } |
a93bbaa7 TI |
187 | if (idx < 0) |
188 | err = -ENODEV; | |
189 | else if (idx < snd_ecards_limit) { | |
190 | if (snd_cards_lock & (1 << idx)) | |
191 | err = -EBUSY; /* invalid */ | |
192 | } else if (idx >= SNDRV_CARDS) | |
193 | err = -ENODEV; | |
194 | if (err < 0) { | |
746df948 | 195 | mutex_unlock(&snd_card_mutex); |
5c33dd70 ON |
196 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
197 | idx, snd_ecards_limit - 1, err); | |
1da177e4 LT |
198 | goto __error; |
199 | } | |
200 | snd_cards_lock |= 1 << idx; /* lock it */ | |
a93bbaa7 TI |
201 | if (idx >= snd_ecards_limit) |
202 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
746df948 | 203 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
204 | card->number = idx; |
205 | card->module = module; | |
206 | INIT_LIST_HEAD(&card->devices); | |
207 | init_rwsem(&card->controls_rwsem); | |
208 | rwlock_init(&card->ctl_files_rwlock); | |
209 | INIT_LIST_HEAD(&card->controls); | |
210 | INIT_LIST_HEAD(&card->ctl_files); | |
211 | spin_lock_init(&card->files_lock); | |
118dd6bf | 212 | INIT_LIST_HEAD(&card->files_list); |
1da177e4 | 213 | init_waitqueue_head(&card->shutdown_sleep); |
1da177e4 | 214 | #ifdef CONFIG_PM |
1a60d4c5 | 215 | mutex_init(&card->power_lock); |
1da177e4 LT |
216 | init_waitqueue_head(&card->power_sleep); |
217 | #endif | |
218 | /* the control interface cannot be accessed from the user space until */ | |
219 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
220 | err = snd_ctl_create(card); |
221 | if (err < 0) { | |
222 | snd_printk(KERN_ERR "unable to register control minors\n"); | |
1da177e4 LT |
223 | goto __error; |
224 | } | |
53fb1e63 TI |
225 | err = snd_info_card_create(card); |
226 | if (err < 0) { | |
227 | snd_printk(KERN_ERR "unable to create card info\n"); | |
1da177e4 LT |
228 | goto __error_ctl; |
229 | } | |
230 | if (extra_size > 0) | |
512bbd6a | 231 | card->private_data = (char *)card + sizeof(struct snd_card); |
53fb1e63 TI |
232 | *card_ret = card; |
233 | return 0; | |
1da177e4 LT |
234 | |
235 | __error_ctl: | |
236 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
237 | __error: | |
238 | kfree(card); | |
53fb1e63 | 239 | return err; |
1da177e4 | 240 | } |
53fb1e63 | 241 | EXPORT_SYMBOL(snd_card_create); |
c0d3fb39 | 242 | |
746df948 TI |
243 | /* return non-zero if a card is already locked */ |
244 | int snd_card_locked(int card) | |
245 | { | |
246 | int locked; | |
247 | ||
248 | mutex_lock(&snd_card_mutex); | |
249 | locked = snd_cards_lock & (1 << card); | |
250 | mutex_unlock(&snd_card_mutex); | |
251 | return locked; | |
252 | } | |
253 | ||
b3b0abe1 CL |
254 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
255 | { | |
256 | return -ENODEV; | |
257 | } | |
258 | ||
259 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
260 | size_t count, loff_t *offset) | |
261 | { | |
262 | return -ENODEV; | |
263 | } | |
264 | ||
265 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
266 | size_t count, loff_t *offset) | |
267 | { | |
268 | return -ENODEV; | |
269 | } | |
270 | ||
a9edfc60 KW |
271 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
272 | { | |
273 | struct snd_monitor_file *df = NULL, *_df; | |
274 | ||
275 | spin_lock(&shutdown_lock); | |
276 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
277 | if (_df->file == file) { | |
278 | df = _df; | |
118dd6bf | 279 | list_del_init(&df->shutdown_list); |
a9edfc60 KW |
280 | break; |
281 | } | |
282 | } | |
283 | spin_unlock(&shutdown_lock); | |
284 | ||
233e70f4 AV |
285 | if (likely(df)) { |
286 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
287 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 288 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 289 | } |
a9edfc60 | 290 | |
9bf8e7dd | 291 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
292 | } |
293 | ||
1da177e4 LT |
294 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
295 | { | |
296 | return POLLERR | POLLNVAL; | |
297 | } | |
298 | ||
b3b0abe1 CL |
299 | static long snd_disconnect_ioctl(struct file *file, |
300 | unsigned int cmd, unsigned long arg) | |
301 | { | |
302 | return -ENODEV; | |
303 | } | |
304 | ||
305 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
306 | { | |
307 | return -ENODEV; | |
308 | } | |
309 | ||
310 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
311 | { | |
312 | return -ENODEV; | |
313 | } | |
314 | ||
9c2e08c5 | 315 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
316 | { |
317 | .owner = THIS_MODULE, | |
318 | .llseek = snd_disconnect_llseek, | |
319 | .read = snd_disconnect_read, | |
320 | .write = snd_disconnect_write, | |
321 | .release = snd_disconnect_release, | |
322 | .poll = snd_disconnect_poll, | |
323 | .unlocked_ioctl = snd_disconnect_ioctl, | |
324 | #ifdef CONFIG_COMPAT | |
325 | .compat_ioctl = snd_disconnect_ioctl, | |
326 | #endif | |
327 | .mmap = snd_disconnect_mmap, | |
328 | .fasync = snd_disconnect_fasync | |
329 | }; | |
330 | ||
1da177e4 LT |
331 | /** |
332 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
333 | * @card: soundcard structure | |
334 | * | |
335 | * Disconnects all APIs from the file-operations (user space). | |
336 | * | |
337 | * Returns zero, otherwise a negative error code. | |
338 | * | |
339 | * Note: The current implementation replaces all active file->f_op with special | |
340 | * dummy file operations (they do nothing except release). | |
341 | */ | |
512bbd6a | 342 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
343 | { |
344 | struct snd_monitor_file *mfile; | |
345 | struct file *file; | |
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 | file = mfile->file; |
370 | ||
371 | /* it's critical part, use endless loop */ | |
372 | /* we have no room to fail */ | |
a9edfc60 | 373 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 374 | |
a9edfc60 KW |
375 | spin_lock(&shutdown_lock); |
376 | list_add(&mfile->shutdown_list, &shutdown_files); | |
377 | spin_unlock(&shutdown_lock); | |
1da177e4 | 378 | |
a9edfc60 | 379 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 380 | fops_get(mfile->file->f_op); |
1da177e4 LT |
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); | |
118dd6bf | 460 | if (list_empty(&card->files_list)) |
c461482c TI |
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 */ | |
118dd6bf | 480 | wait_event(card->shutdown_sleep, list_empty(&card->files_list)); |
c461482c | 481 | snd_card_do_free(card); |
1da177e4 LT |
482 | return 0; |
483 | } | |
484 | ||
c0d3fb39 TI |
485 | EXPORT_SYMBOL(snd_card_free); |
486 | ||
5fdc18d9 | 487 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *nid) |
1da177e4 | 488 | { |
d001544d | 489 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
10a8ebbb JK |
490 | const char *spos, *src; |
491 | char *id; | |
1da177e4 | 492 | |
10a8ebbb JK |
493 | if (nid == NULL) { |
494 | id = card->shortname; | |
495 | spos = src = id; | |
496 | while (*id != '\0') { | |
497 | if (*id == ' ') | |
498 | spos = id + 1; | |
499 | id++; | |
500 | } | |
501 | } else { | |
502 | spos = src = nid; | |
1da177e4 LT |
503 | } |
504 | id = card->id; | |
505 | while (*spos != '\0' && !isalnum(*spos)) | |
506 | spos++; | |
507 | if (isdigit(*spos)) | |
10a8ebbb | 508 | *id++ = isalpha(src[0]) ? src[0] : 'D'; |
1da177e4 LT |
509 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { |
510 | if (isalnum(*spos)) | |
511 | *id++ = *spos; | |
512 | spos++; | |
513 | } | |
514 | *id = '\0'; | |
515 | ||
516 | id = card->id; | |
517 | ||
518 | if (*id == '\0') | |
519 | strcpy(id, "default"); | |
520 | ||
521 | while (1) { | |
522 | if (loops-- == 0) { | |
10a8ebbb | 523 | snd_printk(KERN_ERR "unable to set card id (%s)\n", id); |
1da177e4 LT |
524 | strcpy(card->id, card->proc_root->name); |
525 | return; | |
526 | } | |
527 | if (!snd_info_check_reserved_words(id)) | |
528 | goto __change; | |
529 | for (i = 0; i < snd_ecards_limit; i++) { | |
5fdc18d9 | 530 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) |
1da177e4 LT |
531 | goto __change; |
532 | } | |
533 | break; | |
534 | ||
535 | __change: | |
536 | len = strlen(id); | |
d001544d CL |
537 | if (idx_flag) { |
538 | if (id[len-1] != '9') | |
539 | id[len-1]++; | |
540 | else | |
541 | id[len-1] = 'A'; | |
542 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
543 | strcat(id, "_1"); |
544 | idx_flag++; | |
545 | } else { | |
546 | spos = id + len - 2; | |
547 | if ((size_t)len <= sizeof(card->id) - 2) | |
548 | spos++; | |
10a8ebbb JK |
549 | *(char *)spos++ = '_'; |
550 | *(char *)spos++ = '1'; | |
551 | *(char *)spos++ = '\0'; | |
1da177e4 LT |
552 | idx_flag++; |
553 | } | |
554 | } | |
555 | } | |
556 | ||
872c7820 MB |
557 | /** |
558 | * snd_card_set_id - set card identification name | |
559 | * @card: soundcard structure | |
560 | * @nid: new identification string | |
561 | * | |
562 | * This function sets the card identification and checks for name | |
563 | * collisions. | |
564 | */ | |
565 | void snd_card_set_id(struct snd_card *card, const char *nid) | |
566 | { | |
5fdc18d9 JK |
567 | /* check if user specified own card->id */ |
568 | if (card->id[0] != '\0') | |
569 | return; | |
570 | mutex_lock(&snd_card_mutex); | |
571 | snd_card_set_id_no_lock(card, nid); | |
572 | mutex_unlock(&snd_card_mutex); | |
872c7820 | 573 | } |
10a8ebbb JK |
574 | EXPORT_SYMBOL(snd_card_set_id); |
575 | ||
9fb6198e JK |
576 | #ifndef CONFIG_SYSFS_DEPRECATED |
577 | static ssize_t | |
578 | card_id_show_attr(struct device *dev, | |
579 | struct device_attribute *attr, char *buf) | |
580 | { | |
581 | struct snd_card *card = dev_get_drvdata(dev); | |
582 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); | |
583 | } | |
584 | ||
585 | static ssize_t | |
586 | card_id_store_attr(struct device *dev, struct device_attribute *attr, | |
587 | const char *buf, size_t count) | |
588 | { | |
589 | struct snd_card *card = dev_get_drvdata(dev); | |
590 | char buf1[sizeof(card->id)]; | |
591 | size_t copy = count > sizeof(card->id) - 1 ? | |
592 | sizeof(card->id) - 1 : count; | |
593 | size_t idx; | |
594 | int c; | |
595 | ||
596 | for (idx = 0; idx < copy; idx++) { | |
597 | c = buf[idx]; | |
598 | if (!isalnum(c) && c != '_' && c != '-') | |
599 | return -EINVAL; | |
600 | } | |
601 | memcpy(buf1, buf, copy); | |
602 | buf1[copy] = '\0'; | |
603 | mutex_lock(&snd_card_mutex); | |
604 | if (!snd_info_check_reserved_words(buf1)) { | |
605 | __exist: | |
606 | mutex_unlock(&snd_card_mutex); | |
607 | return -EEXIST; | |
608 | } | |
609 | for (idx = 0; idx < snd_ecards_limit; idx++) { | |
610 | if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) | |
611 | goto __exist; | |
612 | } | |
613 | strcpy(card->id, buf1); | |
c2eb9c4e | 614 | snd_info_card_id_change(card); |
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); | |
633 | #endif /* CONFIG_SYSFS_DEPRECATED */ | |
634 | ||
1da177e4 LT |
635 | /** |
636 | * snd_card_register - register the soundcard | |
637 | * @card: soundcard structure | |
638 | * | |
639 | * This function registers all the devices assigned to the soundcard. | |
640 | * Until calling this, the ALSA control interface is blocked from the | |
641 | * external accesses. Thus, you should call this function at the end | |
642 | * of the initialization of the card. | |
643 | * | |
644 | * Returns zero otherwise a negative error code if the registrain failed. | |
645 | */ | |
512bbd6a | 646 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
647 | { |
648 | int err; | |
1da177e4 | 649 | |
7eaa943c TI |
650 | if (snd_BUG_ON(!card)) |
651 | return -EINVAL; | |
7d2aae1e TI |
652 | #ifndef CONFIG_SYSFS_DEPRECATED |
653 | if (!card->card_dev) { | |
abe9ab8f | 654 | card->card_dev = device_create(sound_class, card->dev, |
9fb6198e | 655 | MKDEV(0, 0), card, |
abe9ab8f | 656 | "card%i", card->number); |
7d2aae1e TI |
657 | if (IS_ERR(card->card_dev)) |
658 | card->card_dev = NULL; | |
d80f19fa | 659 | } |
7d2aae1e | 660 | #endif |
1da177e4 LT |
661 | if ((err = snd_device_register_all(card)) < 0) |
662 | return err; | |
746df948 | 663 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
664 | if (snd_cards[card->number]) { |
665 | /* already registered */ | |
746df948 | 666 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
667 | return 0; |
668 | } | |
5fdc18d9 | 669 | snd_card_set_id_no_lock(card, card->id[0] == '\0' ? NULL : card->id); |
1da177e4 | 670 | snd_cards[card->number] = card; |
746df948 | 671 | mutex_unlock(&snd_card_mutex); |
e28563cc | 672 | init_info_for_card(card); |
1da177e4 LT |
673 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
674 | if (snd_mixer_oss_notify_callback) | |
675 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e JK |
676 | #endif |
677 | #ifndef CONFIG_SYSFS_DEPRECATED | |
678 | if (card->card_dev) { | |
2af75293 HE |
679 | err = device_create_file(card->card_dev, &card_id_attrs); |
680 | if (err < 0) | |
681 | return err; | |
682 | err = device_create_file(card->card_dev, &card_number_attrs); | |
683 | if (err < 0) | |
684 | return err; | |
9fb6198e | 685 | } |
1da177e4 LT |
686 | #endif |
687 | return 0; | |
688 | } | |
689 | ||
c0d3fb39 TI |
690 | EXPORT_SYMBOL(snd_card_register); |
691 | ||
e28563cc | 692 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 693 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 694 | |
a381a7a6 TI |
695 | static void snd_card_info_read(struct snd_info_entry *entry, |
696 | 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++; | |
d001544d | 705 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
706 | idx, |
707 | card->id, | |
708 | card->driver, | |
709 | card->shortname); | |
d001544d | 710 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
711 | card->longname); |
712 | } | |
746df948 | 713 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
714 | } |
715 | if (!count) | |
716 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
717 | } | |
718 | ||
e28563cc | 719 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 720 | |
512bbd6a | 721 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
722 | { |
723 | int idx, count; | |
512bbd6a | 724 | struct snd_card *card; |
1da177e4 LT |
725 | |
726 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 727 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
728 | if ((card = snd_cards[idx]) != NULL) { |
729 | count++; | |
730 | snd_iprintf(buffer, "%s\n", card->longname); | |
731 | } | |
746df948 | 732 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
733 | } |
734 | if (!count) { | |
735 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
736 | } | |
737 | } | |
738 | ||
739 | #endif | |
740 | ||
741 | #ifdef MODULE | |
512bbd6a TI |
742 | static struct snd_info_entry *snd_card_module_info_entry; |
743 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
744 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
745 | { |
746 | int idx; | |
512bbd6a | 747 | struct snd_card *card; |
1da177e4 LT |
748 | |
749 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 750 | mutex_lock(&snd_card_mutex); |
1da177e4 | 751 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
752 | snd_iprintf(buffer, "%2i %s\n", |
753 | idx, card->module->name); | |
746df948 | 754 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
755 | } |
756 | } | |
757 | #endif | |
758 | ||
759 | int __init snd_card_info_init(void) | |
760 | { | |
512bbd6a | 761 | struct snd_info_entry *entry; |
1da177e4 LT |
762 | |
763 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
764 | if (! entry) |
765 | return -ENOMEM; | |
1da177e4 LT |
766 | entry->c.text.read = snd_card_info_read; |
767 | if (snd_info_register(entry) < 0) { | |
768 | snd_info_free_entry(entry); | |
769 | return -ENOMEM; | |
770 | } | |
771 | snd_card_info_entry = entry; | |
772 | ||
773 | #ifdef MODULE | |
774 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
775 | if (entry) { | |
1da177e4 LT |
776 | entry->c.text.read = snd_card_module_info_read; |
777 | if (snd_info_register(entry) < 0) | |
778 | snd_info_free_entry(entry); | |
779 | else | |
780 | snd_card_module_info_entry = entry; | |
781 | } | |
782 | #endif | |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
787 | int __exit snd_card_info_done(void) | |
788 | { | |
746d4a02 | 789 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 790 | #ifdef MODULE |
746d4a02 | 791 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
792 | #endif |
793 | return 0; | |
794 | } | |
795 | ||
e28563cc TI |
796 | #endif /* CONFIG_PROC_FS */ |
797 | ||
1da177e4 LT |
798 | /** |
799 | * snd_component_add - add a component string | |
800 | * @card: soundcard structure | |
801 | * @component: the component id string | |
802 | * | |
803 | * This function adds the component id string to the supported list. | |
804 | * The component can be referred from the alsa-lib. | |
805 | * | |
806 | * Returns zero otherwise a negative error code. | |
807 | */ | |
808 | ||
512bbd6a | 809 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
810 | { |
811 | char *ptr; | |
812 | int len = strlen(component); | |
813 | ||
814 | ptr = strstr(card->components, component); | |
815 | if (ptr != NULL) { | |
816 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
817 | return 1; | |
818 | } | |
819 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
820 | snd_BUG(); | |
821 | return -ENOMEM; | |
822 | } | |
823 | if (card->components[0] != '\0') | |
824 | strcat(card->components, " "); | |
825 | strcat(card->components, component); | |
826 | return 0; | |
827 | } | |
828 | ||
c0d3fb39 TI |
829 | EXPORT_SYMBOL(snd_component_add); |
830 | ||
1da177e4 LT |
831 | /** |
832 | * snd_card_file_add - add the file to the file list of the card | |
833 | * @card: soundcard structure | |
834 | * @file: file pointer | |
835 | * | |
836 | * This function adds the file to the file linked-list of the card. | |
837 | * This linked-list is used to keep tracking the connection state, | |
838 | * and to avoid the release of busy resources by hotplug. | |
839 | * | |
840 | * Returns zero or a negative error code. | |
841 | */ | |
512bbd6a | 842 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
843 | { |
844 | struct snd_monitor_file *mfile; | |
845 | ||
846 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
847 | if (mfile == NULL) | |
848 | return -ENOMEM; | |
849 | mfile->file = file; | |
a9edfc60 | 850 | mfile->disconnected_f_op = NULL; |
1da177e4 LT |
851 | spin_lock(&card->files_lock); |
852 | if (card->shutdown) { | |
853 | spin_unlock(&card->files_lock); | |
854 | kfree(mfile); | |
855 | return -ENODEV; | |
856 | } | |
118dd6bf | 857 | list_add(&mfile->list, &card->files_list); |
1da177e4 LT |
858 | spin_unlock(&card->files_lock); |
859 | return 0; | |
860 | } | |
861 | ||
c0d3fb39 TI |
862 | EXPORT_SYMBOL(snd_card_file_add); |
863 | ||
1da177e4 LT |
864 | /** |
865 | * snd_card_file_remove - remove the file from the file list | |
866 | * @card: soundcard structure | |
867 | * @file: file pointer | |
868 | * | |
869 | * This function removes the file formerly added to the card via | |
870 | * snd_card_file_add() function. | |
2b29b13c TI |
871 | * If all files are removed and snd_card_free_when_closed() was |
872 | * called beforehand, it processes the pending release of | |
873 | * resources. | |
1da177e4 LT |
874 | * |
875 | * Returns zero or a negative error code. | |
876 | */ | |
512bbd6a | 877 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 | 878 | { |
118dd6bf | 879 | struct snd_monitor_file *mfile, *found = NULL; |
c461482c | 880 | int last_close = 0; |
1da177e4 LT |
881 | |
882 | spin_lock(&card->files_lock); | |
118dd6bf | 883 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 | 884 | if (mfile->file == file) { |
118dd6bf TI |
885 | list_del(&mfile->list); |
886 | if (mfile->disconnected_f_op) | |
887 | fops_put(mfile->disconnected_f_op); | |
888 | found = mfile; | |
1da177e4 LT |
889 | break; |
890 | } | |
a9edfc60 | 891 | } |
118dd6bf | 892 | if (list_empty(&card->files_list)) |
c461482c TI |
893 | last_close = 1; |
894 | spin_unlock(&card->files_lock); | |
895 | if (last_close) { | |
1da177e4 | 896 | wake_up(&card->shutdown_sleep); |
c461482c TI |
897 | if (card->free_on_last_close) |
898 | snd_card_do_free(card); | |
899 | } | |
118dd6bf | 900 | if (!found) { |
1da177e4 LT |
901 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
902 | return -ENOENT; | |
903 | } | |
118dd6bf | 904 | kfree(found); |
1da177e4 LT |
905 | return 0; |
906 | } | |
907 | ||
c0d3fb39 TI |
908 | EXPORT_SYMBOL(snd_card_file_remove); |
909 | ||
1da177e4 LT |
910 | #ifdef CONFIG_PM |
911 | /** | |
912 | * snd_power_wait - wait until the power-state is changed. | |
913 | * @card: soundcard structure | |
914 | * @power_state: expected power state | |
1da177e4 LT |
915 | * |
916 | * Waits until the power-state is changed. | |
917 | * | |
918 | * Note: the power lock must be active before call. | |
919 | */ | |
cbac4b0c | 920 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
921 | { |
922 | wait_queue_t wait; | |
923 | int result = 0; | |
924 | ||
925 | /* fastpath */ | |
926 | if (snd_power_get_state(card) == power_state) | |
927 | return 0; | |
928 | init_waitqueue_entry(&wait, current); | |
929 | add_wait_queue(&card->power_sleep, &wait); | |
930 | while (1) { | |
931 | if (card->shutdown) { | |
932 | result = -ENODEV; | |
933 | break; | |
934 | } | |
935 | if (snd_power_get_state(card) == power_state) | |
936 | break; | |
1da177e4 LT |
937 | set_current_state(TASK_UNINTERRUPTIBLE); |
938 | snd_power_unlock(card); | |
939 | schedule_timeout(30 * HZ); | |
940 | snd_power_lock(card); | |
941 | } | |
942 | remove_wait_queue(&card->power_sleep, &wait); | |
943 | return result; | |
944 | } | |
945 | ||
c0d3fb39 | 946 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 947 | #endif /* CONFIG_PM */ |