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; | |
10a8ebbb | 155 | if (xid) |
5fdc18d9 | 156 | strlcpy(card->id, xid, sizeof(card->id)); |
1da177e4 | 157 | err = 0; |
746df948 | 158 | mutex_lock(&snd_card_mutex); |
1da177e4 | 159 | if (idx < 0) { |
1da177e4 | 160 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) |
5c33dd70 | 161 | /* idx == -1 == 0xffff means: take any free slot */ |
1da177e4 | 162 | if (~snd_cards_lock & idx & 1<<idx2) { |
a93bbaa7 TI |
163 | if (module_slot_match(module, idx2)) { |
164 | idx = idx2; | |
165 | break; | |
166 | } | |
167 | } | |
168 | } | |
169 | if (idx < 0) { | |
170 | for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) | |
171 | /* idx == -1 == 0xffff means: take any free slot */ | |
172 | if (~snd_cards_lock & idx & 1<<idx2) { | |
173 | if (!slots[idx2] || !*slots[idx2]) { | |
174 | idx = idx2; | |
175 | break; | |
176 | } | |
1da177e4 | 177 | } |
5c33dd70 | 178 | } |
a93bbaa7 TI |
179 | if (idx < 0) |
180 | err = -ENODEV; | |
181 | else if (idx < snd_ecards_limit) { | |
182 | if (snd_cards_lock & (1 << idx)) | |
183 | err = -EBUSY; /* invalid */ | |
184 | } else if (idx >= SNDRV_CARDS) | |
185 | err = -ENODEV; | |
186 | if (err < 0) { | |
746df948 | 187 | mutex_unlock(&snd_card_mutex); |
5c33dd70 ON |
188 | snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", |
189 | idx, snd_ecards_limit - 1, err); | |
1da177e4 LT |
190 | goto __error; |
191 | } | |
192 | snd_cards_lock |= 1 << idx; /* lock it */ | |
a93bbaa7 TI |
193 | if (idx >= snd_ecards_limit) |
194 | snd_ecards_limit = idx + 1; /* increase the limit */ | |
746df948 | 195 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
196 | card->number = idx; |
197 | card->module = module; | |
198 | INIT_LIST_HEAD(&card->devices); | |
199 | init_rwsem(&card->controls_rwsem); | |
200 | rwlock_init(&card->ctl_files_rwlock); | |
201 | INIT_LIST_HEAD(&card->controls); | |
202 | INIT_LIST_HEAD(&card->ctl_files); | |
203 | spin_lock_init(&card->files_lock); | |
118dd6bf | 204 | INIT_LIST_HEAD(&card->files_list); |
1da177e4 | 205 | init_waitqueue_head(&card->shutdown_sleep); |
1da177e4 | 206 | #ifdef CONFIG_PM |
1a60d4c5 | 207 | mutex_init(&card->power_lock); |
1da177e4 LT |
208 | init_waitqueue_head(&card->power_sleep); |
209 | #endif | |
210 | /* the control interface cannot be accessed from the user space until */ | |
211 | /* snd_cards_bitmask and snd_cards are set with snd_card_register */ | |
53fb1e63 TI |
212 | err = snd_ctl_create(card); |
213 | if (err < 0) { | |
214 | snd_printk(KERN_ERR "unable to register control minors\n"); | |
1da177e4 LT |
215 | goto __error; |
216 | } | |
53fb1e63 TI |
217 | err = snd_info_card_create(card); |
218 | if (err < 0) { | |
219 | snd_printk(KERN_ERR "unable to create card info\n"); | |
1da177e4 LT |
220 | goto __error_ctl; |
221 | } | |
222 | if (extra_size > 0) | |
512bbd6a | 223 | card->private_data = (char *)card + sizeof(struct snd_card); |
53fb1e63 TI |
224 | *card_ret = card; |
225 | return 0; | |
1da177e4 LT |
226 | |
227 | __error_ctl: | |
228 | snd_device_free_all(card, SNDRV_DEV_CMD_PRE); | |
229 | __error: | |
230 | kfree(card); | |
53fb1e63 | 231 | return err; |
1da177e4 | 232 | } |
53fb1e63 | 233 | EXPORT_SYMBOL(snd_card_create); |
c0d3fb39 | 234 | |
746df948 TI |
235 | /* return non-zero if a card is already locked */ |
236 | int snd_card_locked(int card) | |
237 | { | |
238 | int locked; | |
239 | ||
240 | mutex_lock(&snd_card_mutex); | |
241 | locked = snd_cards_lock & (1 << card); | |
242 | mutex_unlock(&snd_card_mutex); | |
243 | return locked; | |
244 | } | |
245 | ||
b3b0abe1 CL |
246 | static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig) |
247 | { | |
248 | return -ENODEV; | |
249 | } | |
250 | ||
251 | static ssize_t snd_disconnect_read(struct file *file, char __user *buf, | |
252 | size_t count, loff_t *offset) | |
253 | { | |
254 | return -ENODEV; | |
255 | } | |
256 | ||
257 | static ssize_t snd_disconnect_write(struct file *file, const char __user *buf, | |
258 | size_t count, loff_t *offset) | |
259 | { | |
260 | return -ENODEV; | |
261 | } | |
262 | ||
a9edfc60 KW |
263 | static int snd_disconnect_release(struct inode *inode, struct file *file) |
264 | { | |
265 | struct snd_monitor_file *df = NULL, *_df; | |
266 | ||
267 | spin_lock(&shutdown_lock); | |
268 | list_for_each_entry(_df, &shutdown_files, shutdown_list) { | |
269 | if (_df->file == file) { | |
270 | df = _df; | |
118dd6bf | 271 | list_del_init(&df->shutdown_list); |
a9edfc60 KW |
272 | break; |
273 | } | |
274 | } | |
275 | spin_unlock(&shutdown_lock); | |
276 | ||
233e70f4 AV |
277 | if (likely(df)) { |
278 | if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync) | |
279 | df->disconnected_f_op->fasync(-1, file, 0); | |
a9edfc60 | 280 | return df->disconnected_f_op->release(inode, file); |
233e70f4 | 281 | } |
a9edfc60 | 282 | |
9bf8e7dd | 283 | panic("%s(%p, %p) failed!", __func__, inode, file); |
a9edfc60 KW |
284 | } |
285 | ||
1da177e4 LT |
286 | static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) |
287 | { | |
288 | return POLLERR | POLLNVAL; | |
289 | } | |
290 | ||
b3b0abe1 CL |
291 | static long snd_disconnect_ioctl(struct file *file, |
292 | unsigned int cmd, unsigned long arg) | |
293 | { | |
294 | return -ENODEV; | |
295 | } | |
296 | ||
297 | static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma) | |
298 | { | |
299 | return -ENODEV; | |
300 | } | |
301 | ||
302 | static int snd_disconnect_fasync(int fd, struct file *file, int on) | |
303 | { | |
304 | return -ENODEV; | |
305 | } | |
306 | ||
9c2e08c5 | 307 | static const struct file_operations snd_shutdown_f_ops = |
a9edfc60 KW |
308 | { |
309 | .owner = THIS_MODULE, | |
310 | .llseek = snd_disconnect_llseek, | |
311 | .read = snd_disconnect_read, | |
312 | .write = snd_disconnect_write, | |
313 | .release = snd_disconnect_release, | |
314 | .poll = snd_disconnect_poll, | |
315 | .unlocked_ioctl = snd_disconnect_ioctl, | |
316 | #ifdef CONFIG_COMPAT | |
317 | .compat_ioctl = snd_disconnect_ioctl, | |
318 | #endif | |
319 | .mmap = snd_disconnect_mmap, | |
320 | .fasync = snd_disconnect_fasync | |
321 | }; | |
322 | ||
1da177e4 LT |
323 | /** |
324 | * snd_card_disconnect - disconnect all APIs from the file-operations (user space) | |
325 | * @card: soundcard structure | |
326 | * | |
327 | * Disconnects all APIs from the file-operations (user space). | |
328 | * | |
329 | * Returns zero, otherwise a negative error code. | |
330 | * | |
331 | * Note: The current implementation replaces all active file->f_op with special | |
332 | * dummy file operations (they do nothing except release). | |
333 | */ | |
512bbd6a | 334 | int snd_card_disconnect(struct snd_card *card) |
1da177e4 LT |
335 | { |
336 | struct snd_monitor_file *mfile; | |
337 | struct file *file; | |
1da177e4 LT |
338 | int err; |
339 | ||
f18638dc TI |
340 | if (!card) |
341 | return -EINVAL; | |
342 | ||
1da177e4 LT |
343 | spin_lock(&card->files_lock); |
344 | if (card->shutdown) { | |
345 | spin_unlock(&card->files_lock); | |
346 | return 0; | |
347 | } | |
348 | card->shutdown = 1; | |
349 | spin_unlock(&card->files_lock); | |
350 | ||
351 | /* phase 1: disable fops (user space) operations for ALSA API */ | |
746df948 | 352 | mutex_lock(&snd_card_mutex); |
1da177e4 | 353 | snd_cards[card->number] = NULL; |
f18638dc | 354 | snd_cards_lock &= ~(1 << card->number); |
746df948 | 355 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
356 | |
357 | /* phase 2: replace file->f_op with special dummy operations */ | |
358 | ||
359 | spin_lock(&card->files_lock); | |
118dd6bf | 360 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 LT |
361 | file = mfile->file; |
362 | ||
363 | /* it's critical part, use endless loop */ | |
364 | /* we have no room to fail */ | |
a9edfc60 | 365 | mfile->disconnected_f_op = mfile->file->f_op; |
1da177e4 | 366 | |
a9edfc60 KW |
367 | spin_lock(&shutdown_lock); |
368 | list_add(&mfile->shutdown_list, &shutdown_files); | |
369 | spin_unlock(&shutdown_lock); | |
1da177e4 | 370 | |
a9edfc60 | 371 | mfile->file->f_op = &snd_shutdown_f_ops; |
bc9abce0 | 372 | fops_get(mfile->file->f_op); |
1da177e4 LT |
373 | } |
374 | spin_unlock(&card->files_lock); | |
375 | ||
376 | /* phase 3: notify all connected devices about disconnection */ | |
377 | /* at this point, they cannot respond to any calls except release() */ | |
378 | ||
379 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
380 | if (snd_mixer_oss_notify_callback) | |
381 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); | |
382 | #endif | |
383 | ||
384 | /* notify all devices that we are disconnected */ | |
385 | err = snd_device_disconnect_all(card); | |
386 | if (err < 0) | |
387 | snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); | |
388 | ||
746d4a02 | 389 | snd_info_card_disconnect(card); |
73d38b13 TI |
390 | #ifndef CONFIG_SYSFS_DEPRECATED |
391 | if (card->card_dev) { | |
392 | device_unregister(card->card_dev); | |
393 | card->card_dev = NULL; | |
394 | } | |
f18638dc TI |
395 | #endif |
396 | #ifdef CONFIG_PM | |
397 | wake_up(&card->power_sleep); | |
73d38b13 | 398 | #endif |
1da177e4 LT |
399 | return 0; |
400 | } | |
401 | ||
c0d3fb39 TI |
402 | EXPORT_SYMBOL(snd_card_disconnect); |
403 | ||
1da177e4 LT |
404 | /** |
405 | * snd_card_free - frees given soundcard structure | |
406 | * @card: soundcard structure | |
407 | * | |
408 | * This function releases the soundcard structure and the all assigned | |
409 | * devices automatically. That is, you don't have to release the devices | |
410 | * by yourself. | |
411 | * | |
412 | * Returns zero. Frees all associated devices and frees the control | |
413 | * interface associated to given soundcard. | |
414 | */ | |
c461482c | 415 | static int snd_card_do_free(struct snd_card *card) |
1da177e4 | 416 | { |
1da177e4 LT |
417 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
418 | if (snd_mixer_oss_notify_callback) | |
419 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); | |
420 | #endif | |
421 | if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { | |
422 | snd_printk(KERN_ERR "unable to free all devices (pre)\n"); | |
423 | /* Fatal, but this situation should never occur */ | |
424 | } | |
425 | if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { | |
426 | snd_printk(KERN_ERR "unable to free all devices (normal)\n"); | |
427 | /* Fatal, but this situation should never occur */ | |
428 | } | |
429 | if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { | |
430 | snd_printk(KERN_ERR "unable to free all devices (post)\n"); | |
431 | /* Fatal, but this situation should never occur */ | |
432 | } | |
433 | if (card->private_free) | |
434 | card->private_free(card); | |
746d4a02 | 435 | snd_info_free_entry(card->proc_id); |
1da177e4 LT |
436 | if (snd_info_card_free(card) < 0) { |
437 | snd_printk(KERN_WARNING "unable to free card info\n"); | |
438 | /* Not fatal error */ | |
439 | } | |
c461482c TI |
440 | kfree(card); |
441 | return 0; | |
442 | } | |
443 | ||
c461482c TI |
444 | int snd_card_free_when_closed(struct snd_card *card) |
445 | { | |
446 | int free_now = 0; | |
f18638dc | 447 | int ret = snd_card_disconnect(card); |
c461482c TI |
448 | if (ret) |
449 | return ret; | |
450 | ||
451 | spin_lock(&card->files_lock); | |
118dd6bf | 452 | if (list_empty(&card->files_list)) |
c461482c TI |
453 | free_now = 1; |
454 | else | |
455 | card->free_on_last_close = 1; | |
456 | spin_unlock(&card->files_lock); | |
457 | ||
458 | if (free_now) | |
459 | snd_card_do_free(card); | |
460 | return 0; | |
461 | } | |
462 | ||
463 | EXPORT_SYMBOL(snd_card_free_when_closed); | |
464 | ||
465 | int snd_card_free(struct snd_card *card) | |
466 | { | |
f18638dc | 467 | int ret = snd_card_disconnect(card); |
c461482c TI |
468 | if (ret) |
469 | return ret; | |
470 | ||
471 | /* wait, until all devices are ready for the free operation */ | |
118dd6bf | 472 | wait_event(card->shutdown_sleep, list_empty(&card->files_list)); |
c461482c | 473 | snd_card_do_free(card); |
1da177e4 LT |
474 | return 0; |
475 | } | |
476 | ||
c0d3fb39 TI |
477 | EXPORT_SYMBOL(snd_card_free); |
478 | ||
5fdc18d9 | 479 | static void snd_card_set_id_no_lock(struct snd_card *card, const char *nid) |
1da177e4 | 480 | { |
d001544d | 481 | int i, len, idx_flag = 0, loops = SNDRV_CARDS; |
10a8ebbb JK |
482 | const char *spos, *src; |
483 | char *id; | |
1da177e4 | 484 | |
10a8ebbb JK |
485 | if (nid == NULL) { |
486 | id = card->shortname; | |
487 | spos = src = id; | |
488 | while (*id != '\0') { | |
489 | if (*id == ' ') | |
490 | spos = id + 1; | |
491 | id++; | |
492 | } | |
493 | } else { | |
494 | spos = src = nid; | |
1da177e4 LT |
495 | } |
496 | id = card->id; | |
497 | while (*spos != '\0' && !isalnum(*spos)) | |
498 | spos++; | |
499 | if (isdigit(*spos)) | |
10a8ebbb | 500 | *id++ = isalpha(src[0]) ? src[0] : 'D'; |
1da177e4 LT |
501 | while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { |
502 | if (isalnum(*spos)) | |
503 | *id++ = *spos; | |
504 | spos++; | |
505 | } | |
506 | *id = '\0'; | |
507 | ||
508 | id = card->id; | |
509 | ||
510 | if (*id == '\0') | |
511 | strcpy(id, "default"); | |
512 | ||
513 | while (1) { | |
514 | if (loops-- == 0) { | |
10a8ebbb | 515 | snd_printk(KERN_ERR "unable to set card id (%s)\n", id); |
1da177e4 LT |
516 | strcpy(card->id, card->proc_root->name); |
517 | return; | |
518 | } | |
519 | if (!snd_info_check_reserved_words(id)) | |
520 | goto __change; | |
521 | for (i = 0; i < snd_ecards_limit; i++) { | |
5fdc18d9 | 522 | if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) |
1da177e4 LT |
523 | goto __change; |
524 | } | |
525 | break; | |
526 | ||
527 | __change: | |
528 | len = strlen(id); | |
d001544d CL |
529 | if (idx_flag) { |
530 | if (id[len-1] != '9') | |
531 | id[len-1]++; | |
532 | else | |
533 | id[len-1] = 'A'; | |
534 | } else if ((size_t)len <= sizeof(card->id) - 3) { | |
1da177e4 LT |
535 | strcat(id, "_1"); |
536 | idx_flag++; | |
537 | } else { | |
538 | spos = id + len - 2; | |
539 | if ((size_t)len <= sizeof(card->id) - 2) | |
540 | spos++; | |
10a8ebbb JK |
541 | *(char *)spos++ = '_'; |
542 | *(char *)spos++ = '1'; | |
543 | *(char *)spos++ = '\0'; | |
1da177e4 LT |
544 | idx_flag++; |
545 | } | |
546 | } | |
547 | } | |
548 | ||
872c7820 MB |
549 | /** |
550 | * snd_card_set_id - set card identification name | |
551 | * @card: soundcard structure | |
552 | * @nid: new identification string | |
553 | * | |
554 | * This function sets the card identification and checks for name | |
555 | * collisions. | |
556 | */ | |
557 | void snd_card_set_id(struct snd_card *card, const char *nid) | |
558 | { | |
5fdc18d9 JK |
559 | /* check if user specified own card->id */ |
560 | if (card->id[0] != '\0') | |
561 | return; | |
562 | mutex_lock(&snd_card_mutex); | |
563 | snd_card_set_id_no_lock(card, nid); | |
564 | mutex_unlock(&snd_card_mutex); | |
872c7820 | 565 | } |
10a8ebbb JK |
566 | EXPORT_SYMBOL(snd_card_set_id); |
567 | ||
9fb6198e JK |
568 | #ifndef CONFIG_SYSFS_DEPRECATED |
569 | static ssize_t | |
570 | card_id_show_attr(struct device *dev, | |
571 | struct device_attribute *attr, char *buf) | |
572 | { | |
573 | struct snd_card *card = dev_get_drvdata(dev); | |
574 | return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)"); | |
575 | } | |
576 | ||
577 | static ssize_t | |
578 | card_id_store_attr(struct device *dev, struct device_attribute *attr, | |
579 | const char *buf, size_t count) | |
580 | { | |
581 | struct snd_card *card = dev_get_drvdata(dev); | |
582 | char buf1[sizeof(card->id)]; | |
583 | size_t copy = count > sizeof(card->id) - 1 ? | |
584 | sizeof(card->id) - 1 : count; | |
585 | size_t idx; | |
586 | int c; | |
587 | ||
588 | for (idx = 0; idx < copy; idx++) { | |
589 | c = buf[idx]; | |
590 | if (!isalnum(c) && c != '_' && c != '-') | |
591 | return -EINVAL; | |
592 | } | |
593 | memcpy(buf1, buf, copy); | |
594 | buf1[copy] = '\0'; | |
595 | mutex_lock(&snd_card_mutex); | |
596 | if (!snd_info_check_reserved_words(buf1)) { | |
597 | __exist: | |
598 | mutex_unlock(&snd_card_mutex); | |
599 | return -EEXIST; | |
600 | } | |
601 | for (idx = 0; idx < snd_ecards_limit; idx++) { | |
602 | if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) | |
603 | goto __exist; | |
604 | } | |
605 | strcpy(card->id, buf1); | |
c2eb9c4e | 606 | snd_info_card_id_change(card); |
9fb6198e JK |
607 | mutex_unlock(&snd_card_mutex); |
608 | ||
609 | return count; | |
610 | } | |
611 | ||
612 | static struct device_attribute card_id_attrs = | |
613 | __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr); | |
614 | ||
615 | static ssize_t | |
616 | card_number_show_attr(struct device *dev, | |
617 | struct device_attribute *attr, char *buf) | |
618 | { | |
619 | struct snd_card *card = dev_get_drvdata(dev); | |
620 | return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1); | |
621 | } | |
622 | ||
623 | static struct device_attribute card_number_attrs = | |
624 | __ATTR(number, S_IRUGO, card_number_show_attr, NULL); | |
625 | #endif /* CONFIG_SYSFS_DEPRECATED */ | |
626 | ||
1da177e4 LT |
627 | /** |
628 | * snd_card_register - register the soundcard | |
629 | * @card: soundcard structure | |
630 | * | |
631 | * This function registers all the devices assigned to the soundcard. | |
632 | * Until calling this, the ALSA control interface is blocked from the | |
633 | * external accesses. Thus, you should call this function at the end | |
634 | * of the initialization of the card. | |
635 | * | |
636 | * Returns zero otherwise a negative error code if the registrain failed. | |
637 | */ | |
512bbd6a | 638 | int snd_card_register(struct snd_card *card) |
1da177e4 LT |
639 | { |
640 | int err; | |
1da177e4 | 641 | |
7eaa943c TI |
642 | if (snd_BUG_ON(!card)) |
643 | return -EINVAL; | |
7d2aae1e TI |
644 | #ifndef CONFIG_SYSFS_DEPRECATED |
645 | if (!card->card_dev) { | |
abe9ab8f | 646 | card->card_dev = device_create(sound_class, card->dev, |
9fb6198e | 647 | MKDEV(0, 0), card, |
abe9ab8f | 648 | "card%i", card->number); |
7d2aae1e TI |
649 | if (IS_ERR(card->card_dev)) |
650 | card->card_dev = NULL; | |
d80f19fa | 651 | } |
7d2aae1e | 652 | #endif |
1da177e4 LT |
653 | if ((err = snd_device_register_all(card)) < 0) |
654 | return err; | |
746df948 | 655 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
656 | if (snd_cards[card->number]) { |
657 | /* already registered */ | |
746df948 | 658 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
659 | return 0; |
660 | } | |
5fdc18d9 | 661 | snd_card_set_id_no_lock(card, card->id[0] == '\0' ? NULL : card->id); |
1da177e4 | 662 | snd_cards[card->number] = card; |
746df948 | 663 | mutex_unlock(&snd_card_mutex); |
e28563cc | 664 | init_info_for_card(card); |
1da177e4 LT |
665 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
666 | if (snd_mixer_oss_notify_callback) | |
667 | snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); | |
9fb6198e JK |
668 | #endif |
669 | #ifndef CONFIG_SYSFS_DEPRECATED | |
670 | if (card->card_dev) { | |
2af75293 HE |
671 | err = device_create_file(card->card_dev, &card_id_attrs); |
672 | if (err < 0) | |
673 | return err; | |
674 | err = device_create_file(card->card_dev, &card_number_attrs); | |
675 | if (err < 0) | |
676 | return err; | |
9fb6198e | 677 | } |
1da177e4 LT |
678 | #endif |
679 | return 0; | |
680 | } | |
681 | ||
c0d3fb39 TI |
682 | EXPORT_SYMBOL(snd_card_register); |
683 | ||
e28563cc | 684 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 685 | static struct snd_info_entry *snd_card_info_entry; |
1da177e4 | 686 | |
a381a7a6 TI |
687 | static void snd_card_info_read(struct snd_info_entry *entry, |
688 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
689 | { |
690 | int idx, count; | |
512bbd6a | 691 | struct snd_card *card; |
1da177e4 LT |
692 | |
693 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 694 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
695 | if ((card = snd_cards[idx]) != NULL) { |
696 | count++; | |
d001544d | 697 | snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n", |
1da177e4 LT |
698 | idx, |
699 | card->id, | |
700 | card->driver, | |
701 | card->shortname); | |
d001544d | 702 | snd_iprintf(buffer, " %s\n", |
1da177e4 LT |
703 | card->longname); |
704 | } | |
746df948 | 705 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
706 | } |
707 | if (!count) | |
708 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
709 | } | |
710 | ||
e28563cc | 711 | #ifdef CONFIG_SND_OSSEMUL |
1da177e4 | 712 | |
512bbd6a | 713 | void snd_card_info_read_oss(struct snd_info_buffer *buffer) |
1da177e4 LT |
714 | { |
715 | int idx, count; | |
512bbd6a | 716 | struct snd_card *card; |
1da177e4 LT |
717 | |
718 | for (idx = count = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 719 | mutex_lock(&snd_card_mutex); |
1da177e4 LT |
720 | if ((card = snd_cards[idx]) != NULL) { |
721 | count++; | |
722 | snd_iprintf(buffer, "%s\n", card->longname); | |
723 | } | |
746df948 | 724 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
725 | } |
726 | if (!count) { | |
727 | snd_iprintf(buffer, "--- no soundcards ---\n"); | |
728 | } | |
729 | } | |
730 | ||
731 | #endif | |
732 | ||
733 | #ifdef MODULE | |
512bbd6a TI |
734 | static struct snd_info_entry *snd_card_module_info_entry; |
735 | static void snd_card_module_info_read(struct snd_info_entry *entry, | |
736 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
737 | { |
738 | int idx; | |
512bbd6a | 739 | struct snd_card *card; |
1da177e4 LT |
740 | |
741 | for (idx = 0; idx < SNDRV_CARDS; idx++) { | |
746df948 | 742 | mutex_lock(&snd_card_mutex); |
1da177e4 | 743 | if ((card = snd_cards[idx]) != NULL) |
d001544d CL |
744 | snd_iprintf(buffer, "%2i %s\n", |
745 | idx, card->module->name); | |
746df948 | 746 | mutex_unlock(&snd_card_mutex); |
1da177e4 LT |
747 | } |
748 | } | |
749 | #endif | |
750 | ||
751 | int __init snd_card_info_init(void) | |
752 | { | |
512bbd6a | 753 | struct snd_info_entry *entry; |
1da177e4 LT |
754 | |
755 | entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); | |
7c22f1aa TI |
756 | if (! entry) |
757 | return -ENOMEM; | |
1da177e4 LT |
758 | entry->c.text.read = snd_card_info_read; |
759 | if (snd_info_register(entry) < 0) { | |
760 | snd_info_free_entry(entry); | |
761 | return -ENOMEM; | |
762 | } | |
763 | snd_card_info_entry = entry; | |
764 | ||
765 | #ifdef MODULE | |
766 | entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); | |
767 | if (entry) { | |
1da177e4 LT |
768 | entry->c.text.read = snd_card_module_info_read; |
769 | if (snd_info_register(entry) < 0) | |
770 | snd_info_free_entry(entry); | |
771 | else | |
772 | snd_card_module_info_entry = entry; | |
773 | } | |
774 | #endif | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
779 | int __exit snd_card_info_done(void) | |
780 | { | |
746d4a02 | 781 | snd_info_free_entry(snd_card_info_entry); |
1da177e4 | 782 | #ifdef MODULE |
746d4a02 | 783 | snd_info_free_entry(snd_card_module_info_entry); |
1da177e4 LT |
784 | #endif |
785 | return 0; | |
786 | } | |
787 | ||
e28563cc TI |
788 | #endif /* CONFIG_PROC_FS */ |
789 | ||
1da177e4 LT |
790 | /** |
791 | * snd_component_add - add a component string | |
792 | * @card: soundcard structure | |
793 | * @component: the component id string | |
794 | * | |
795 | * This function adds the component id string to the supported list. | |
796 | * The component can be referred from the alsa-lib. | |
797 | * | |
798 | * Returns zero otherwise a negative error code. | |
799 | */ | |
800 | ||
512bbd6a | 801 | int snd_component_add(struct snd_card *card, const char *component) |
1da177e4 LT |
802 | { |
803 | char *ptr; | |
804 | int len = strlen(component); | |
805 | ||
806 | ptr = strstr(card->components, component); | |
807 | if (ptr != NULL) { | |
808 | if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ | |
809 | return 1; | |
810 | } | |
811 | if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { | |
812 | snd_BUG(); | |
813 | return -ENOMEM; | |
814 | } | |
815 | if (card->components[0] != '\0') | |
816 | strcat(card->components, " "); | |
817 | strcat(card->components, component); | |
818 | return 0; | |
819 | } | |
820 | ||
c0d3fb39 TI |
821 | EXPORT_SYMBOL(snd_component_add); |
822 | ||
1da177e4 LT |
823 | /** |
824 | * snd_card_file_add - add the file to the file list of the card | |
825 | * @card: soundcard structure | |
826 | * @file: file pointer | |
827 | * | |
828 | * This function adds the file to the file linked-list of the card. | |
829 | * This linked-list is used to keep tracking the connection state, | |
830 | * and to avoid the release of busy resources by hotplug. | |
831 | * | |
832 | * Returns zero or a negative error code. | |
833 | */ | |
512bbd6a | 834 | int snd_card_file_add(struct snd_card *card, struct file *file) |
1da177e4 LT |
835 | { |
836 | struct snd_monitor_file *mfile; | |
837 | ||
838 | mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); | |
839 | if (mfile == NULL) | |
840 | return -ENOMEM; | |
841 | mfile->file = file; | |
a9edfc60 | 842 | mfile->disconnected_f_op = NULL; |
1da177e4 LT |
843 | spin_lock(&card->files_lock); |
844 | if (card->shutdown) { | |
845 | spin_unlock(&card->files_lock); | |
846 | kfree(mfile); | |
847 | return -ENODEV; | |
848 | } | |
118dd6bf | 849 | list_add(&mfile->list, &card->files_list); |
1da177e4 LT |
850 | spin_unlock(&card->files_lock); |
851 | return 0; | |
852 | } | |
853 | ||
c0d3fb39 TI |
854 | EXPORT_SYMBOL(snd_card_file_add); |
855 | ||
1da177e4 LT |
856 | /** |
857 | * snd_card_file_remove - remove the file from the file list | |
858 | * @card: soundcard structure | |
859 | * @file: file pointer | |
860 | * | |
861 | * This function removes the file formerly added to the card via | |
862 | * snd_card_file_add() function. | |
2b29b13c TI |
863 | * If all files are removed and snd_card_free_when_closed() was |
864 | * called beforehand, it processes the pending release of | |
865 | * resources. | |
1da177e4 LT |
866 | * |
867 | * Returns zero or a negative error code. | |
868 | */ | |
512bbd6a | 869 | int snd_card_file_remove(struct snd_card *card, struct file *file) |
1da177e4 | 870 | { |
118dd6bf | 871 | struct snd_monitor_file *mfile, *found = NULL; |
c461482c | 872 | int last_close = 0; |
1da177e4 LT |
873 | |
874 | spin_lock(&card->files_lock); | |
118dd6bf | 875 | list_for_each_entry(mfile, &card->files_list, list) { |
1da177e4 | 876 | if (mfile->file == file) { |
118dd6bf TI |
877 | list_del(&mfile->list); |
878 | if (mfile->disconnected_f_op) | |
879 | fops_put(mfile->disconnected_f_op); | |
880 | found = mfile; | |
1da177e4 LT |
881 | break; |
882 | } | |
a9edfc60 | 883 | } |
118dd6bf | 884 | if (list_empty(&card->files_list)) |
c461482c TI |
885 | last_close = 1; |
886 | spin_unlock(&card->files_lock); | |
887 | if (last_close) { | |
1da177e4 | 888 | wake_up(&card->shutdown_sleep); |
c461482c TI |
889 | if (card->free_on_last_close) |
890 | snd_card_do_free(card); | |
891 | } | |
118dd6bf | 892 | if (!found) { |
1da177e4 LT |
893 | snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); |
894 | return -ENOENT; | |
895 | } | |
118dd6bf | 896 | kfree(found); |
1da177e4 LT |
897 | return 0; |
898 | } | |
899 | ||
c0d3fb39 TI |
900 | EXPORT_SYMBOL(snd_card_file_remove); |
901 | ||
1da177e4 LT |
902 | #ifdef CONFIG_PM |
903 | /** | |
904 | * snd_power_wait - wait until the power-state is changed. | |
905 | * @card: soundcard structure | |
906 | * @power_state: expected power state | |
1da177e4 LT |
907 | * |
908 | * Waits until the power-state is changed. | |
909 | * | |
910 | * Note: the power lock must be active before call. | |
911 | */ | |
cbac4b0c | 912 | int snd_power_wait(struct snd_card *card, unsigned int power_state) |
1da177e4 LT |
913 | { |
914 | wait_queue_t wait; | |
915 | int result = 0; | |
916 | ||
917 | /* fastpath */ | |
918 | if (snd_power_get_state(card) == power_state) | |
919 | return 0; | |
920 | init_waitqueue_entry(&wait, current); | |
921 | add_wait_queue(&card->power_sleep, &wait); | |
922 | while (1) { | |
923 | if (card->shutdown) { | |
924 | result = -ENODEV; | |
925 | break; | |
926 | } | |
927 | if (snd_power_get_state(card) == power_state) | |
928 | break; | |
1da177e4 LT |
929 | set_current_state(TASK_UNINTERRUPTIBLE); |
930 | snd_power_unlock(card); | |
931 | schedule_timeout(30 * HZ); | |
932 | snd_power_lock(card); | |
933 | } | |
934 | remove_wait_queue(&card->power_sleep, &wait); | |
935 | return result; | |
936 | } | |
937 | ||
c0d3fb39 | 938 | EXPORT_SYMBOL(snd_power_wait); |
1da177e4 | 939 | #endif /* CONFIG_PM */ |