]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Routines for driver control interface | |
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/threads.h> |
23 | #include <linux/interrupt.h> | |
1da177e4 LT |
24 | #include <linux/slab.h> |
25 | #include <linux/vmalloc.h> | |
26 | #include <linux/time.h> | |
27 | #include <sound/core.h> | |
28 | #include <sound/minors.h> | |
29 | #include <sound/info.h> | |
30 | #include <sound/control.h> | |
31 | ||
32 | /* max number of user-defined controls */ | |
33 | #define MAX_USER_CONTROLS 32 | |
34 | ||
82e9bae6 | 35 | struct snd_kctl_ioctl { |
1da177e4 LT |
36 | struct list_head list; /* list of all ioctls */ |
37 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 38 | }; |
1da177e4 LT |
39 | |
40 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
41 | static LIST_HEAD(snd_control_ioctls); | |
42 | #ifdef CONFIG_COMPAT | |
43 | static LIST_HEAD(snd_control_compat_ioctls); | |
44 | #endif | |
45 | ||
46 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
47 | { | |
1da177e4 | 48 | unsigned long flags; |
82e9bae6 TI |
49 | struct snd_card *card; |
50 | struct snd_ctl_file *ctl; | |
1da177e4 LT |
51 | int err; |
52 | ||
f87135f5 | 53 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
54 | if (!card) { |
55 | err = -ENODEV; | |
56 | goto __error1; | |
57 | } | |
58 | err = snd_card_file_add(card, file); | |
59 | if (err < 0) { | |
60 | err = -ENODEV; | |
61 | goto __error1; | |
62 | } | |
63 | if (!try_module_get(card->module)) { | |
64 | err = -EFAULT; | |
65 | goto __error2; | |
66 | } | |
ca2c0966 | 67 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
68 | if (ctl == NULL) { |
69 | err = -ENOMEM; | |
70 | goto __error; | |
71 | } | |
72 | INIT_LIST_HEAD(&ctl->events); | |
73 | init_waitqueue_head(&ctl->change_sleep); | |
74 | spin_lock_init(&ctl->read_lock); | |
75 | ctl->card = card; | |
2529bba7 TI |
76 | ctl->prefer_pcm_subdevice = -1; |
77 | ctl->prefer_rawmidi_subdevice = -1; | |
1da177e4 LT |
78 | ctl->pid = current->pid; |
79 | file->private_data = ctl; | |
80 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
81 | list_add_tail(&ctl->list, &card->ctl_files); | |
82 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
83 | return 0; | |
84 | ||
85 | __error: | |
86 | module_put(card->module); | |
87 | __error2: | |
88 | snd_card_file_remove(card, file); | |
89 | __error1: | |
90 | return err; | |
91 | } | |
92 | ||
82e9bae6 | 93 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 94 | { |
7507e8da | 95 | unsigned long flags; |
82e9bae6 | 96 | struct snd_kctl_event *cread; |
1da177e4 | 97 | |
7507e8da | 98 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
99 | while (!list_empty(&ctl->events)) { |
100 | cread = snd_kctl_event(ctl->events.next); | |
101 | list_del(&cread->list); | |
102 | kfree(cread); | |
103 | } | |
7507e8da | 104 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
105 | } |
106 | ||
107 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
108 | { | |
109 | unsigned long flags; | |
82e9bae6 TI |
110 | struct snd_card *card; |
111 | struct snd_ctl_file *ctl; | |
112 | struct snd_kcontrol *control; | |
1da177e4 LT |
113 | unsigned int idx; |
114 | ||
115 | ctl = file->private_data; | |
116 | fasync_helper(-1, file, 0, &ctl->fasync); | |
117 | file->private_data = NULL; | |
118 | card = ctl->card; | |
119 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
120 | list_del(&ctl->list); | |
121 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
122 | down_write(&card->controls_rwsem); | |
9244b2c3 | 123 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
124 | for (idx = 0; idx < control->count; idx++) |
125 | if (control->vd[idx].owner == ctl) | |
126 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
127 | up_write(&card->controls_rwsem); |
128 | snd_ctl_empty_read_queue(ctl); | |
129 | kfree(ctl); | |
130 | module_put(card->module); | |
131 | snd_card_file_remove(card, file); | |
132 | return 0; | |
133 | } | |
134 | ||
82e9bae6 TI |
135 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
136 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
137 | { |
138 | unsigned long flags; | |
82e9bae6 TI |
139 | struct snd_ctl_file *ctl; |
140 | struct snd_kctl_event *ev; | |
1da177e4 | 141 | |
7c22f1aa | 142 | snd_assert(card != NULL && id != NULL, return); |
1da177e4 LT |
143 | read_lock(&card->ctl_files_rwlock); |
144 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
145 | card->mixer_oss_change_count++; | |
146 | #endif | |
9244b2c3 | 147 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
148 | if (!ctl->subscribed) |
149 | continue; | |
150 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 151 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
152 | if (ev->id.numid == id->numid) { |
153 | ev->mask |= mask; | |
154 | goto _found; | |
155 | } | |
156 | } | |
ca2c0966 | 157 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
158 | if (ev) { |
159 | ev->id = *id; | |
160 | ev->mask = mask; | |
161 | list_add_tail(&ev->list, &ctl->events); | |
162 | } else { | |
163 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
164 | } | |
165 | _found: | |
166 | wake_up(&ctl->change_sleep); | |
167 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
168 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
169 | } | |
170 | read_unlock(&card->ctl_files_rwlock); | |
171 | } | |
172 | ||
c0d3fb39 TI |
173 | EXPORT_SYMBOL(snd_ctl_notify); |
174 | ||
1da177e4 LT |
175 | /** |
176 | * snd_ctl_new - create a control instance from the template | |
177 | * @control: the control template | |
178 | * @access: the default control access | |
179 | * | |
82e9bae6 | 180 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
181 | * to the new instance. It does not copy volatile data (access). |
182 | * | |
183 | * Returns the pointer of the new instance, or NULL on failure. | |
184 | */ | |
0b51ba07 AB |
185 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
186 | unsigned int access) | |
1da177e4 | 187 | { |
82e9bae6 | 188 | struct snd_kcontrol *kctl; |
1da177e4 LT |
189 | unsigned int idx; |
190 | ||
7c22f1aa TI |
191 | snd_assert(control != NULL, return NULL); |
192 | snd_assert(control->count > 0, return NULL); | |
82e9bae6 | 193 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 TI |
194 | if (kctl == NULL) { |
195 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); | |
1da177e4 | 196 | return NULL; |
73e77ba0 | 197 | } |
1da177e4 LT |
198 | *kctl = *control; |
199 | for (idx = 0; idx < kctl->count; idx++) | |
200 | kctl->vd[idx].access = access; | |
201 | return kctl; | |
202 | } | |
203 | ||
204 | /** | |
205 | * snd_ctl_new1 - create a control instance from the template | |
206 | * @ncontrol: the initialization record | |
207 | * @private_data: the private data to set | |
208 | * | |
82e9bae6 | 209 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
210 | * template. When the access field of ncontrol is 0, it's assumed as |
211 | * READWRITE access. When the count field is 0, it's assumes as one. | |
212 | * | |
213 | * Returns the pointer of the newly generated instance, or NULL on failure. | |
214 | */ | |
82e9bae6 TI |
215 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
216 | void *private_data) | |
1da177e4 | 217 | { |
82e9bae6 | 218 | struct snd_kcontrol kctl; |
1da177e4 LT |
219 | unsigned int access; |
220 | ||
7c22f1aa | 221 | snd_assert(ncontrol != NULL, return NULL); |
1da177e4 LT |
222 | snd_assert(ncontrol->info != NULL, return NULL); |
223 | memset(&kctl, 0, sizeof(kctl)); | |
224 | kctl.id.iface = ncontrol->iface; | |
225 | kctl.id.device = ncontrol->device; | |
226 | kctl.id.subdevice = ncontrol->subdevice; | |
227 | if (ncontrol->name) | |
228 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); | |
229 | kctl.id.index = ncontrol->index; | |
230 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
231 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 JK |
232 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
233 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| | |
8aa9b586 JK |
234 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
235 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
236 | kctl.info = ncontrol->info; |
237 | kctl.get = ncontrol->get; | |
238 | kctl.put = ncontrol->put; | |
8aa9b586 | 239 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
240 | kctl.private_value = ncontrol->private_value; |
241 | kctl.private_data = private_data; | |
242 | return snd_ctl_new(&kctl, access); | |
243 | } | |
244 | ||
c0d3fb39 TI |
245 | EXPORT_SYMBOL(snd_ctl_new1); |
246 | ||
1da177e4 LT |
247 | /** |
248 | * snd_ctl_free_one - release the control instance | |
249 | * @kcontrol: the control instance | |
250 | * | |
251 | * Releases the control instance created via snd_ctl_new() | |
252 | * or snd_ctl_new1(). | |
253 | * Don't call this after the control was added to the card. | |
254 | */ | |
82e9bae6 | 255 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
256 | { |
257 | if (kcontrol) { | |
258 | if (kcontrol->private_free) | |
259 | kcontrol->private_free(kcontrol); | |
260 | kfree(kcontrol); | |
261 | } | |
262 | } | |
263 | ||
c0d3fb39 TI |
264 | EXPORT_SYMBOL(snd_ctl_free_one); |
265 | ||
82e9bae6 | 266 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
1da177e4 LT |
267 | unsigned int count) |
268 | { | |
82e9bae6 | 269 | struct snd_kcontrol *kctl; |
1da177e4 | 270 | |
9244b2c3 | 271 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
272 | if ((kctl->id.numid <= card->last_numid && |
273 | kctl->id.numid + kctl->count > card->last_numid) || | |
274 | (kctl->id.numid <= card->last_numid + count - 1 && | |
275 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) | |
276 | return card->last_numid = kctl->id.numid + kctl->count - 1; | |
277 | } | |
278 | return card->last_numid; | |
279 | } | |
280 | ||
82e9bae6 | 281 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 LT |
282 | { |
283 | unsigned int last_numid, iter = 100000; | |
284 | ||
285 | last_numid = card->last_numid; | |
286 | while (last_numid != snd_ctl_hole_check(card, count)) { | |
287 | if (--iter == 0) { | |
288 | /* this situation is very unlikely */ | |
289 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
290 | return -ENOMEM; | |
291 | } | |
292 | last_numid = card->last_numid; | |
293 | } | |
294 | return 0; | |
295 | } | |
296 | ||
297 | /** | |
298 | * snd_ctl_add - add the control instance to the card | |
299 | * @card: the card instance | |
300 | * @kcontrol: the control instance to add | |
301 | * | |
302 | * Adds the control instance created via snd_ctl_new() or | |
303 | * snd_ctl_new1() to the given card. Assigns also an unique | |
304 | * numid used for fast search. | |
305 | * | |
306 | * Returns zero if successful, or a negative error code on failure. | |
307 | * | |
308 | * It frees automatically the control which cannot be added. | |
309 | */ | |
82e9bae6 | 310 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 311 | { |
82e9bae6 | 312 | struct snd_ctl_elem_id id; |
1da177e4 | 313 | unsigned int idx; |
c6077b30 | 314 | int err = -EINVAL; |
1da177e4 | 315 | |
73e77ba0 | 316 | if (! kcontrol) |
c6077b30 TI |
317 | return err; |
318 | snd_assert(card != NULL, goto error); | |
319 | snd_assert(kcontrol->info != NULL, goto error); | |
1da177e4 LT |
320 | id = kcontrol->id; |
321 | down_write(&card->controls_rwsem); | |
322 | if (snd_ctl_find_id(card, &id)) { | |
323 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
324 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
325 | id.iface, | |
326 | id.device, | |
327 | id.subdevice, | |
328 | id.name, | |
329 | id.index); | |
c6077b30 TI |
330 | err = -EBUSY; |
331 | goto error; | |
1da177e4 LT |
332 | } |
333 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
334 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
335 | err = -ENOMEM; |
336 | goto error; | |
1da177e4 LT |
337 | } |
338 | list_add_tail(&kcontrol->list, &card->controls); | |
339 | card->controls_count += kcontrol->count; | |
340 | kcontrol->id.numid = card->last_numid + 1; | |
341 | card->last_numid += kcontrol->count; | |
342 | up_write(&card->controls_rwsem); | |
343 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
344 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
345 | return 0; | |
c6077b30 TI |
346 | |
347 | error: | |
348 | snd_ctl_free_one(kcontrol); | |
349 | return err; | |
1da177e4 LT |
350 | } |
351 | ||
c0d3fb39 TI |
352 | EXPORT_SYMBOL(snd_ctl_add); |
353 | ||
1da177e4 LT |
354 | /** |
355 | * snd_ctl_remove - remove the control from the card and release it | |
356 | * @card: the card instance | |
357 | * @kcontrol: the control instance to remove | |
358 | * | |
359 | * Removes the control from the card and then releases the instance. | |
360 | * You don't need to call snd_ctl_free_one(). You must be in | |
361 | * the write lock - down_write(&card->controls_rwsem). | |
362 | * | |
363 | * Returns 0 if successful, or a negative error code on failure. | |
364 | */ | |
82e9bae6 | 365 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 366 | { |
82e9bae6 | 367 | struct snd_ctl_elem_id id; |
1da177e4 LT |
368 | unsigned int idx; |
369 | ||
7c22f1aa | 370 | snd_assert(card != NULL && kcontrol != NULL, return -EINVAL); |
1da177e4 LT |
371 | list_del(&kcontrol->list); |
372 | card->controls_count -= kcontrol->count; | |
373 | id = kcontrol->id; | |
374 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
375 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
376 | snd_ctl_free_one(kcontrol); | |
377 | return 0; | |
378 | } | |
379 | ||
c0d3fb39 TI |
380 | EXPORT_SYMBOL(snd_ctl_remove); |
381 | ||
1da177e4 LT |
382 | /** |
383 | * snd_ctl_remove_id - remove the control of the given id and release it | |
384 | * @card: the card instance | |
385 | * @id: the control id to remove | |
386 | * | |
387 | * Finds the control instance with the given id, removes it from the | |
388 | * card list and releases it. | |
389 | * | |
390 | * Returns 0 if successful, or a negative error code on failure. | |
391 | */ | |
82e9bae6 | 392 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 393 | { |
82e9bae6 | 394 | struct snd_kcontrol *kctl; |
1da177e4 LT |
395 | int ret; |
396 | ||
397 | down_write(&card->controls_rwsem); | |
398 | kctl = snd_ctl_find_id(card, id); | |
399 | if (kctl == NULL) { | |
400 | up_write(&card->controls_rwsem); | |
401 | return -ENOENT; | |
402 | } | |
403 | ret = snd_ctl_remove(card, kctl); | |
404 | up_write(&card->controls_rwsem); | |
405 | return ret; | |
406 | } | |
407 | ||
c0d3fb39 TI |
408 | EXPORT_SYMBOL(snd_ctl_remove_id); |
409 | ||
1da177e4 LT |
410 | /** |
411 | * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it | |
412 | * @file: active control handle | |
413 | * @id: the control id to remove | |
414 | * | |
415 | * Finds the control instance with the given id, removes it from the | |
416 | * card list and releases it. | |
417 | * | |
418 | * Returns 0 if successful, or a negative error code on failure. | |
419 | */ | |
82e9bae6 TI |
420 | static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file, |
421 | struct snd_ctl_elem_id *id) | |
1da177e4 | 422 | { |
82e9bae6 TI |
423 | struct snd_card *card = file->card; |
424 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
425 | int idx, ret; |
426 | ||
427 | down_write(&card->controls_rwsem); | |
428 | kctl = snd_ctl_find_id(card, id); | |
429 | if (kctl == NULL) { | |
430 | up_write(&card->controls_rwsem); | |
431 | return -ENOENT; | |
432 | } | |
433 | for (idx = 0; idx < kctl->count; idx++) | |
434 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
435 | up_write(&card->controls_rwsem); | |
436 | return -EBUSY; | |
437 | } | |
438 | ret = snd_ctl_remove(card, kctl); | |
439 | up_write(&card->controls_rwsem); | |
440 | return ret; | |
441 | } | |
442 | ||
443 | /** | |
444 | * snd_ctl_rename_id - replace the id of a control on the card | |
445 | * @card: the card instance | |
446 | * @src_id: the old id | |
447 | * @dst_id: the new id | |
448 | * | |
449 | * Finds the control with the old id from the card, and replaces the | |
450 | * id with the new one. | |
451 | * | |
452 | * Returns zero if successful, or a negative error code on failure. | |
453 | */ | |
82e9bae6 TI |
454 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
455 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 456 | { |
82e9bae6 | 457 | struct snd_kcontrol *kctl; |
1da177e4 LT |
458 | |
459 | down_write(&card->controls_rwsem); | |
460 | kctl = snd_ctl_find_id(card, src_id); | |
461 | if (kctl == NULL) { | |
462 | up_write(&card->controls_rwsem); | |
463 | return -ENOENT; | |
464 | } | |
465 | kctl->id = *dst_id; | |
466 | kctl->id.numid = card->last_numid + 1; | |
467 | card->last_numid += kctl->count; | |
468 | up_write(&card->controls_rwsem); | |
469 | return 0; | |
470 | } | |
471 | ||
c0d3fb39 TI |
472 | EXPORT_SYMBOL(snd_ctl_rename_id); |
473 | ||
1da177e4 LT |
474 | /** |
475 | * snd_ctl_find_numid - find the control instance with the given number-id | |
476 | * @card: the card instance | |
477 | * @numid: the number-id to search | |
478 | * | |
479 | * Finds the control instance with the given number-id from the card. | |
480 | * | |
481 | * Returns the pointer of the instance if found, or NULL if not. | |
482 | * | |
483 | * The caller must down card->controls_rwsem before calling this function | |
484 | * (if the race condition can happen). | |
485 | */ | |
82e9bae6 | 486 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 487 | { |
82e9bae6 | 488 | struct snd_kcontrol *kctl; |
1da177e4 | 489 | |
7c22f1aa | 490 | snd_assert(card != NULL && numid != 0, return NULL); |
9244b2c3 | 491 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
492 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
493 | return kctl; | |
494 | } | |
495 | return NULL; | |
496 | } | |
497 | ||
c0d3fb39 TI |
498 | EXPORT_SYMBOL(snd_ctl_find_numid); |
499 | ||
1da177e4 LT |
500 | /** |
501 | * snd_ctl_find_id - find the control instance with the given id | |
502 | * @card: the card instance | |
503 | * @id: the id to search | |
504 | * | |
505 | * Finds the control instance with the given id from the card. | |
506 | * | |
507 | * Returns the pointer of the instance if found, or NULL if not. | |
508 | * | |
509 | * The caller must down card->controls_rwsem before calling this function | |
510 | * (if the race condition can happen). | |
511 | */ | |
82e9bae6 TI |
512 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
513 | struct snd_ctl_elem_id *id) | |
1da177e4 | 514 | { |
82e9bae6 | 515 | struct snd_kcontrol *kctl; |
1da177e4 | 516 | |
7c22f1aa | 517 | snd_assert(card != NULL && id != NULL, return NULL); |
1da177e4 LT |
518 | if (id->numid != 0) |
519 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 520 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
521 | if (kctl->id.iface != id->iface) |
522 | continue; | |
523 | if (kctl->id.device != id->device) | |
524 | continue; | |
525 | if (kctl->id.subdevice != id->subdevice) | |
526 | continue; | |
527 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
528 | continue; | |
529 | if (kctl->id.index > id->index) | |
530 | continue; | |
531 | if (kctl->id.index + kctl->count <= id->index) | |
532 | continue; | |
533 | return kctl; | |
534 | } | |
535 | return NULL; | |
536 | } | |
537 | ||
c0d3fb39 TI |
538 | EXPORT_SYMBOL(snd_ctl_find_id); |
539 | ||
82e9bae6 | 540 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
541 | unsigned int cmd, void __user *arg) |
542 | { | |
82e9bae6 | 543 | struct snd_ctl_card_info *info; |
1da177e4 | 544 | |
ca2c0966 | 545 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
546 | if (! info) |
547 | return -ENOMEM; | |
548 | down_read(&snd_ioctl_rwsem); | |
549 | info->card = card->number; | |
550 | strlcpy(info->id, card->id, sizeof(info->id)); | |
551 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
552 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
553 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
554 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
555 | strlcpy(info->components, card->components, sizeof(info->components)); | |
556 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 557 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
558 | kfree(info); |
559 | return -EFAULT; | |
560 | } | |
561 | kfree(info); | |
562 | return 0; | |
563 | } | |
564 | ||
82e9bae6 TI |
565 | static int snd_ctl_elem_list(struct snd_card *card, |
566 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
567 | { |
568 | struct list_head *plist; | |
82e9bae6 TI |
569 | struct snd_ctl_elem_list list; |
570 | struct snd_kcontrol *kctl; | |
571 | struct snd_ctl_elem_id *dst, *id; | |
1da177e4 LT |
572 | unsigned int offset, space, first, jidx; |
573 | ||
574 | if (copy_from_user(&list, _list, sizeof(list))) | |
575 | return -EFAULT; | |
576 | offset = list.offset; | |
577 | space = list.space; | |
578 | first = 0; | |
579 | /* try limit maximum space */ | |
580 | if (space > 16384) | |
581 | return -ENOMEM; | |
582 | if (space > 0) { | |
583 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 584 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
585 | if (dst == NULL) |
586 | return -ENOMEM; | |
587 | down_read(&card->controls_rwsem); | |
588 | list.count = card->controls_count; | |
589 | plist = card->controls.next; | |
590 | while (plist != &card->controls) { | |
591 | if (offset == 0) | |
592 | break; | |
593 | kctl = snd_kcontrol(plist); | |
594 | if (offset < kctl->count) | |
595 | break; | |
596 | offset -= kctl->count; | |
597 | plist = plist->next; | |
598 | } | |
599 | list.used = 0; | |
600 | id = dst; | |
601 | while (space > 0 && plist != &card->controls) { | |
602 | kctl = snd_kcontrol(plist); | |
603 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
604 | snd_ctl_build_ioff(id, kctl, jidx); | |
605 | id++; | |
606 | space--; | |
607 | list.used++; | |
608 | } | |
609 | plist = plist->next; | |
610 | offset = 0; | |
611 | } | |
612 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
613 | if (list.used > 0 && |
614 | copy_to_user(list.pids, dst, | |
615 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
616 | vfree(dst); |
617 | return -EFAULT; | |
618 | } | |
619 | vfree(dst); | |
620 | } else { | |
621 | down_read(&card->controls_rwsem); | |
622 | list.count = card->controls_count; | |
623 | up_read(&card->controls_rwsem); | |
624 | } | |
625 | if (copy_to_user(_list, &list, sizeof(list))) | |
626 | return -EFAULT; | |
627 | return 0; | |
628 | } | |
629 | ||
82e9bae6 TI |
630 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
631 | struct snd_ctl_elem_info *info) | |
1da177e4 | 632 | { |
82e9bae6 TI |
633 | struct snd_card *card = ctl->card; |
634 | struct snd_kcontrol *kctl; | |
635 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
636 | unsigned int index_offset; |
637 | int result; | |
638 | ||
639 | down_read(&card->controls_rwsem); | |
640 | kctl = snd_ctl_find_id(card, &info->id); | |
641 | if (kctl == NULL) { | |
642 | up_read(&card->controls_rwsem); | |
643 | return -ENOENT; | |
644 | } | |
645 | #ifdef CONFIG_SND_DEBUG | |
646 | info->access = 0; | |
647 | #endif | |
648 | result = kctl->info(kctl, info); | |
649 | if (result >= 0) { | |
650 | snd_assert(info->access == 0, ); | |
651 | index_offset = snd_ctl_get_ioff(kctl, &info->id); | |
652 | vd = &kctl->vd[index_offset]; | |
653 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
654 | info->access = vd->access; | |
655 | if (vd->owner) { | |
656 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
657 | if (vd->owner == ctl) | |
658 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
659 | info->owner = vd->owner_pid; | |
660 | } else { | |
661 | info->owner = -1; | |
662 | } | |
663 | } | |
664 | up_read(&card->controls_rwsem); | |
665 | return result; | |
666 | } | |
667 | ||
82e9bae6 TI |
668 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
669 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 670 | { |
82e9bae6 | 671 | struct snd_ctl_elem_info info; |
1da177e4 LT |
672 | int result; |
673 | ||
674 | if (copy_from_user(&info, _info, sizeof(info))) | |
675 | return -EFAULT; | |
64649400 | 676 | snd_power_lock(ctl->card); |
cbac4b0c | 677 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
678 | if (result >= 0) |
679 | result = snd_ctl_elem_info(ctl, &info); | |
680 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
681 | if (result >= 0) |
682 | if (copy_to_user(_info, &info, sizeof(info))) | |
683 | return -EFAULT; | |
684 | return result; | |
685 | } | |
686 | ||
d3bd67cd TI |
687 | static int snd_ctl_elem_read(struct snd_card *card, |
688 | struct snd_ctl_elem_value *control) | |
1da177e4 | 689 | { |
82e9bae6 TI |
690 | struct snd_kcontrol *kctl; |
691 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 692 | unsigned int index_offset; |
8ace4f3c | 693 | int result; |
1da177e4 LT |
694 | |
695 | down_read(&card->controls_rwsem); | |
696 | kctl = snd_ctl_find_id(card, &control->id); | |
697 | if (kctl == NULL) { | |
698 | result = -ENOENT; | |
699 | } else { | |
700 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
701 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
702 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
703 | kctl->get != NULL) { | |
704 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
705 | result = kctl->get(kctl, control); | |
706 | } else | |
707 | result = -EPERM; | |
1da177e4 LT |
708 | } |
709 | up_read(&card->controls_rwsem); | |
710 | return result; | |
711 | } | |
712 | ||
82e9bae6 TI |
713 | static int snd_ctl_elem_read_user(struct snd_card *card, |
714 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 715 | { |
82e9bae6 | 716 | struct snd_ctl_elem_value *control; |
1da177e4 LT |
717 | int result; |
718 | ||
719 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
720 | if (control == NULL) | |
721 | return -ENOMEM; | |
722 | if (copy_from_user(control, _control, sizeof(*control))) { | |
723 | kfree(control); | |
724 | return -EFAULT; | |
725 | } | |
64649400 | 726 | snd_power_lock(card); |
cbac4b0c | 727 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
728 | if (result >= 0) |
729 | result = snd_ctl_elem_read(card, control); | |
730 | snd_power_unlock(card); | |
1da177e4 LT |
731 | if (result >= 0) |
732 | if (copy_to_user(_control, control, sizeof(*control))) | |
733 | result = -EFAULT; | |
734 | kfree(control); | |
735 | return result; | |
736 | } | |
737 | ||
d3bd67cd TI |
738 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
739 | struct snd_ctl_elem_value *control) | |
1da177e4 | 740 | { |
82e9bae6 TI |
741 | struct snd_kcontrol *kctl; |
742 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 743 | unsigned int index_offset; |
8ace4f3c | 744 | int result; |
1da177e4 LT |
745 | |
746 | down_read(&card->controls_rwsem); | |
747 | kctl = snd_ctl_find_id(card, &control->id); | |
748 | if (kctl == NULL) { | |
749 | result = -ENOENT; | |
750 | } else { | |
751 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
752 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
753 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
754 | kctl->put == NULL || | |
755 | (file && vd->owner && vd->owner != file)) { | |
756 | result = -EPERM; | |
1da177e4 | 757 | } else { |
8ace4f3c TI |
758 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
759 | result = kctl->put(kctl, control); | |
760 | } | |
761 | if (result > 0) { | |
762 | up_read(&card->controls_rwsem); | |
763 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
764 | &control->id); | |
765 | return 0; | |
1da177e4 LT |
766 | } |
767 | } | |
768 | up_read(&card->controls_rwsem); | |
769 | return result; | |
770 | } | |
771 | ||
82e9bae6 TI |
772 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
773 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 774 | { |
82e9bae6 | 775 | struct snd_ctl_elem_value *control; |
64649400 | 776 | struct snd_card *card; |
1da177e4 LT |
777 | int result; |
778 | ||
779 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
780 | if (control == NULL) | |
781 | return -ENOMEM; | |
782 | if (copy_from_user(control, _control, sizeof(*control))) { | |
783 | kfree(control); | |
784 | return -EFAULT; | |
785 | } | |
64649400 GP |
786 | card = file->card; |
787 | snd_power_lock(card); | |
cbac4b0c | 788 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
789 | if (result >= 0) |
790 | result = snd_ctl_elem_write(card, file, control); | |
791 | snd_power_unlock(card); | |
1da177e4 LT |
792 | if (result >= 0) |
793 | if (copy_to_user(_control, control, sizeof(*control))) | |
794 | result = -EFAULT; | |
795 | kfree(control); | |
796 | return result; | |
797 | } | |
798 | ||
82e9bae6 TI |
799 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
800 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 801 | { |
82e9bae6 TI |
802 | struct snd_card *card = file->card; |
803 | struct snd_ctl_elem_id id; | |
804 | struct snd_kcontrol *kctl; | |
805 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
806 | int result; |
807 | ||
808 | if (copy_from_user(&id, _id, sizeof(id))) | |
809 | return -EFAULT; | |
810 | down_write(&card->controls_rwsem); | |
811 | kctl = snd_ctl_find_id(card, &id); | |
812 | if (kctl == NULL) { | |
813 | result = -ENOENT; | |
814 | } else { | |
815 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
816 | if (vd->owner != NULL) | |
817 | result = -EBUSY; | |
818 | else { | |
819 | vd->owner = file; | |
820 | vd->owner_pid = current->pid; | |
821 | result = 0; | |
822 | } | |
823 | } | |
824 | up_write(&card->controls_rwsem); | |
825 | return result; | |
826 | } | |
827 | ||
82e9bae6 TI |
828 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
829 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 830 | { |
82e9bae6 TI |
831 | struct snd_card *card = file->card; |
832 | struct snd_ctl_elem_id id; | |
833 | struct snd_kcontrol *kctl; | |
834 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
835 | int result; |
836 | ||
837 | if (copy_from_user(&id, _id, sizeof(id))) | |
838 | return -EFAULT; | |
839 | down_write(&card->controls_rwsem); | |
840 | kctl = snd_ctl_find_id(card, &id); | |
841 | if (kctl == NULL) { | |
842 | result = -ENOENT; | |
843 | } else { | |
844 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
845 | if (vd->owner == NULL) | |
846 | result = -EINVAL; | |
847 | else if (vd->owner != file) | |
848 | result = -EPERM; | |
849 | else { | |
850 | vd->owner = NULL; | |
851 | vd->owner_pid = 0; | |
852 | result = 0; | |
853 | } | |
854 | } | |
855 | up_write(&card->controls_rwsem); | |
856 | return result; | |
857 | } | |
858 | ||
859 | struct user_element { | |
82e9bae6 | 860 | struct snd_ctl_elem_info info; |
1da177e4 LT |
861 | void *elem_data; /* element data */ |
862 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
863 | void *tlv_data; /* TLV data */ |
864 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 LT |
865 | void *priv_data; /* private data (like strings for enumerated type) */ |
866 | unsigned long priv_data_size; /* size of private data in bytes */ | |
867 | }; | |
868 | ||
82e9bae6 TI |
869 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
870 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
871 | { |
872 | struct user_element *ue = kcontrol->private_data; | |
873 | ||
874 | *uinfo = ue->info; | |
875 | return 0; | |
876 | } | |
877 | ||
82e9bae6 TI |
878 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
879 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
880 | { |
881 | struct user_element *ue = kcontrol->private_data; | |
882 | ||
883 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
884 | return 0; | |
885 | } | |
886 | ||
82e9bae6 TI |
887 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
888 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
889 | { |
890 | int change; | |
891 | struct user_element *ue = kcontrol->private_data; | |
892 | ||
893 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
894 | if (change) | |
895 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
896 | return change; | |
897 | } | |
898 | ||
8aa9b586 JK |
899 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
900 | int op_flag, | |
901 | unsigned int size, | |
902 | unsigned int __user *tlv) | |
903 | { | |
904 | struct user_element *ue = kcontrol->private_data; | |
905 | int change = 0; | |
906 | void *new_data; | |
907 | ||
908 | if (op_flag > 0) { | |
909 | if (size > 1024 * 128) /* sane value */ | |
910 | return -EINVAL; | |
911 | new_data = kmalloc(size, GFP_KERNEL); | |
912 | if (new_data == NULL) | |
913 | return -ENOMEM; | |
914 | if (copy_from_user(new_data, tlv, size)) { | |
915 | kfree(new_data); | |
916 | return -EFAULT; | |
917 | } | |
918 | change = ue->tlv_data_size != size; | |
919 | if (!change) | |
920 | change = memcmp(ue->tlv_data, new_data, size); | |
921 | kfree(ue->tlv_data); | |
922 | ue->tlv_data = new_data; | |
923 | ue->tlv_data_size = size; | |
924 | } else { | |
18c1c3f6 TI |
925 | if (! ue->tlv_data_size || ! ue->tlv_data) |
926 | return -ENXIO; | |
8aa9b586 JK |
927 | if (size < ue->tlv_data_size) |
928 | return -ENOSPC; | |
929 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) | |
930 | return -EFAULT; | |
931 | } | |
932 | return change; | |
933 | } | |
934 | ||
82e9bae6 | 935 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 936 | { |
8aa9b586 JK |
937 | struct user_element *ue = kcontrol->private_data; |
938 | if (ue->tlv_data) | |
939 | kfree(ue->tlv_data); | |
940 | kfree(ue); | |
1da177e4 LT |
941 | } |
942 | ||
82e9bae6 TI |
943 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
944 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 945 | { |
82e9bae6 TI |
946 | struct snd_card *card = file->card; |
947 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
948 | unsigned int access; |
949 | long private_size; | |
950 | struct user_element *ue; | |
951 | int idx, err; | |
952 | ||
953 | if (card->user_ctl_count >= MAX_USER_CONTROLS) | |
954 | return -ENOMEM; | |
955 | if (info->count > 1024) | |
956 | return -EINVAL; | |
957 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 958 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
959 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
960 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
961 | info->id.numid = 0; |
962 | memset(&kctl, 0, sizeof(kctl)); | |
963 | down_write(&card->controls_rwsem); | |
964 | _kctl = snd_ctl_find_id(card, &info->id); | |
965 | err = 0; | |
966 | if (_kctl) { | |
967 | if (replace) | |
968 | err = snd_ctl_remove(card, _kctl); | |
969 | else | |
970 | err = -EBUSY; | |
971 | } else { | |
972 | if (replace) | |
973 | err = -ENOENT; | |
974 | } | |
975 | up_write(&card->controls_rwsem); | |
976 | if (err < 0) | |
977 | return err; | |
978 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
979 | kctl.count = info->owner ? info->owner : 1; | |
980 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
981 | kctl.info = snd_ctl_elem_user_info; | |
982 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
983 | kctl.get = snd_ctl_elem_user_get; | |
984 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
985 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
986 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
987 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
988 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
989 | } | |
1da177e4 LT |
990 | switch (info->type) { |
991 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
992 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
993 | private_size = sizeof(long); | |
994 | if (info->count > 128) | |
995 | return -EINVAL; | |
996 | break; | |
997 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
998 | private_size = sizeof(long long); | |
999 | if (info->count > 64) | |
1000 | return -EINVAL; | |
1001 | break; | |
1002 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
1003 | private_size = sizeof(unsigned char); | |
1004 | if (info->count > 512) | |
1005 | return -EINVAL; | |
1006 | break; | |
1007 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1008 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1009 | if (info->count != 1) |
1010 | return -EINVAL; | |
1011 | break; | |
1012 | default: | |
1013 | return -EINVAL; | |
1014 | } | |
1015 | private_size *= info->count; | |
ca2c0966 | 1016 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1017 | if (ue == NULL) |
1018 | return -ENOMEM; | |
1019 | ue->info = *info; | |
86148e84 | 1020 | ue->info.access = 0; |
1da177e4 LT |
1021 | ue->elem_data = (char *)ue + sizeof(*ue); |
1022 | ue->elem_data_size = private_size; | |
1023 | kctl.private_free = snd_ctl_elem_user_free; | |
1024 | _kctl = snd_ctl_new(&kctl, access); | |
1025 | if (_kctl == NULL) { | |
2fbf182e | 1026 | kfree(ue); |
1da177e4 LT |
1027 | return -ENOMEM; |
1028 | } | |
1029 | _kctl->private_data = ue; | |
1030 | for (idx = 0; idx < _kctl->count; idx++) | |
1031 | _kctl->vd[idx].owner = file; | |
1032 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1033 | if (err < 0) |
1da177e4 | 1034 | return err; |
1da177e4 LT |
1035 | |
1036 | down_write(&card->controls_rwsem); | |
1037 | card->user_ctl_count++; | |
1038 | up_write(&card->controls_rwsem); | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
82e9bae6 TI |
1043 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1044 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1045 | { |
82e9bae6 | 1046 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1047 | if (copy_from_user(&info, _info, sizeof(info))) |
1048 | return -EFAULT; | |
1049 | return snd_ctl_elem_add(file, &info, replace); | |
1050 | } | |
1051 | ||
82e9bae6 TI |
1052 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1053 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1054 | { |
82e9bae6 | 1055 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1056 | int err; |
1057 | ||
1058 | if (copy_from_user(&id, _id, sizeof(id))) | |
1059 | return -EFAULT; | |
1060 | err = snd_ctl_remove_unlocked_id(file, &id); | |
1061 | if (! err) { | |
82e9bae6 | 1062 | struct snd_card *card = file->card; |
1da177e4 LT |
1063 | down_write(&card->controls_rwsem); |
1064 | card->user_ctl_count--; | |
1065 | up_write(&card->controls_rwsem); | |
1066 | } | |
1067 | return err; | |
1068 | } | |
1069 | ||
82e9bae6 | 1070 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1071 | { |
1072 | int subscribe; | |
1073 | if (get_user(subscribe, ptr)) | |
1074 | return -EFAULT; | |
1075 | if (subscribe < 0) { | |
1076 | subscribe = file->subscribed; | |
1077 | if (put_user(subscribe, ptr)) | |
1078 | return -EFAULT; | |
1079 | return 0; | |
1080 | } | |
1081 | if (subscribe) { | |
1082 | file->subscribed = 1; | |
1083 | return 0; | |
1084 | } else if (file->subscribed) { | |
1085 | snd_ctl_empty_read_queue(file); | |
1086 | file->subscribed = 0; | |
1087 | } | |
1088 | return 0; | |
1089 | } | |
1090 | ||
8aa9b586 JK |
1091 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1092 | struct snd_ctl_tlv __user *_tlv, | |
1093 | int op_flag) | |
42750b04 | 1094 | { |
8aa9b586 | 1095 | struct snd_card *card = file->card; |
42750b04 JK |
1096 | struct snd_ctl_tlv tlv; |
1097 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1098 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1099 | unsigned int len; |
1100 | int err = 0; | |
1101 | ||
1102 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1103 | return -EFAULT; | |
8aa9b586 JK |
1104 | if (tlv.length < sizeof(unsigned int) * 3) |
1105 | return -EINVAL; | |
1106 | down_read(&card->controls_rwsem); | |
1107 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1108 | if (kctl == NULL) { | |
1109 | err = -ENOENT; | |
1110 | goto __kctl_end; | |
1111 | } | |
1112 | if (kctl->tlv.p == NULL) { | |
1113 | err = -ENXIO; | |
1114 | goto __kctl_end; | |
1115 | } | |
1116 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1117 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1118 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1119 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1120 | err = -ENXIO; | |
1121 | goto __kctl_end; | |
1122 | } | |
1123 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
1124 | if (file && vd->owner != NULL && vd->owner != file) { | |
1125 | err = -EPERM; | |
1126 | goto __kctl_end; | |
1127 | } | |
1128 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); | |
1129 | if (err > 0) { | |
1130 | up_read(&card->controls_rwsem); | |
1131 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1132 | return 0; | |
1133 | } | |
1134 | } else { | |
1135 | if (op_flag) { | |
1136 | err = -ENXIO; | |
1137 | goto __kctl_end; | |
1138 | } | |
1139 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1140 | if (tlv.length < len) { | |
1141 | err = -ENOMEM; | |
1142 | goto __kctl_end; | |
1143 | } | |
1144 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1145 | err = -EFAULT; | |
1146 | } | |
42750b04 | 1147 | __kctl_end: |
8aa9b586 JK |
1148 | up_read(&card->controls_rwsem); |
1149 | return err; | |
42750b04 JK |
1150 | } |
1151 | ||
1da177e4 LT |
1152 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1153 | { | |
82e9bae6 TI |
1154 | struct snd_ctl_file *ctl; |
1155 | struct snd_card *card; | |
82e9bae6 | 1156 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1157 | void __user *argp = (void __user *)arg; |
1158 | int __user *ip = argp; | |
1159 | int err; | |
1160 | ||
1161 | ctl = file->private_data; | |
1162 | card = ctl->card; | |
1163 | snd_assert(card != NULL, return -ENXIO); | |
1164 | switch (cmd) { | |
1165 | case SNDRV_CTL_IOCTL_PVERSION: | |
1166 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1167 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1168 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1169 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1170 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1171 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1172 | return snd_ctl_elem_info_user(ctl, argp); | |
1173 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1174 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1175 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1176 | return snd_ctl_elem_write_user(ctl, argp); | |
1177 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1178 | return snd_ctl_elem_lock(ctl, argp); | |
1179 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1180 | return snd_ctl_elem_unlock(ctl, argp); | |
1181 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1182 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1183 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1184 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1185 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1186 | return snd_ctl_elem_remove(ctl, argp); | |
1187 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1188 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 JK |
1189 | case SNDRV_CTL_IOCTL_TLV_READ: |
1190 | return snd_ctl_tlv_ioctl(ctl, argp, 0); | |
1191 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
1192 | return snd_ctl_tlv_ioctl(ctl, argp, 1); | |
1193 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1194 | return snd_ctl_tlv_ioctl(ctl, argp, -1); | |
1da177e4 | 1195 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1196 | return -ENOPROTOOPT; |
1da177e4 LT |
1197 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1198 | #ifdef CONFIG_PM | |
1199 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1200 | #else | |
1201 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1202 | #endif | |
1203 | } | |
1204 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1205 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1206 | err = p->fioctl(card, ctl, cmd, arg); |
1207 | if (err != -ENOIOCTLCMD) { | |
1208 | up_read(&snd_ioctl_rwsem); | |
1209 | return err; | |
1210 | } | |
1211 | } | |
1212 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1213 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1214 | return -ENOTTY; |
1215 | } | |
1216 | ||
82e9bae6 TI |
1217 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1218 | size_t count, loff_t * offset) | |
1da177e4 | 1219 | { |
82e9bae6 | 1220 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1221 | int err = 0; |
1222 | ssize_t result = 0; | |
1223 | ||
1224 | ctl = file->private_data; | |
1225 | snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO); | |
1226 | if (!ctl->subscribed) | |
1227 | return -EBADFD; | |
82e9bae6 | 1228 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1229 | return -EINVAL; |
1230 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1231 | while (count >= sizeof(struct snd_ctl_event)) { |
1232 | struct snd_ctl_event ev; | |
1233 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1234 | while (list_empty(&ctl->events)) { |
1235 | wait_queue_t wait; | |
1236 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1237 | err = -EAGAIN; | |
1238 | goto __end_lock; | |
1239 | } | |
1240 | init_waitqueue_entry(&wait, current); | |
1241 | add_wait_queue(&ctl->change_sleep, &wait); | |
1242 | set_current_state(TASK_INTERRUPTIBLE); | |
1243 | spin_unlock_irq(&ctl->read_lock); | |
1244 | schedule(); | |
1245 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1246 | if (signal_pending(current)) | |
0e5d720c | 1247 | return -ERESTARTSYS; |
1da177e4 LT |
1248 | spin_lock_irq(&ctl->read_lock); |
1249 | } | |
1250 | kev = snd_kctl_event(ctl->events.next); | |
1251 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1252 | ev.data.elem.mask = kev->mask; | |
1253 | ev.data.elem.id = kev->id; | |
1254 | list_del(&kev->list); | |
1255 | spin_unlock_irq(&ctl->read_lock); | |
1256 | kfree(kev); | |
82e9bae6 | 1257 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1258 | err = -EFAULT; |
1259 | goto __end; | |
1260 | } | |
1261 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1262 | buffer += sizeof(struct snd_ctl_event); |
1263 | count -= sizeof(struct snd_ctl_event); | |
1264 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1265 | } |
1266 | __end_lock: | |
1267 | spin_unlock_irq(&ctl->read_lock); | |
1268 | __end: | |
1269 | return result > 0 ? result : err; | |
1270 | } | |
1271 | ||
1272 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1273 | { | |
1274 | unsigned int mask; | |
82e9bae6 | 1275 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1276 | |
1277 | ctl = file->private_data; | |
1278 | if (!ctl->subscribed) | |
1279 | return 0; | |
1280 | poll_wait(file, &ctl->change_sleep, wait); | |
1281 | ||
1282 | mask = 0; | |
1283 | if (!list_empty(&ctl->events)) | |
1284 | mask |= POLLIN | POLLRDNORM; | |
1285 | ||
1286 | return mask; | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | * register the device-specific control-ioctls. | |
1291 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1292 | */ | |
1293 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1294 | { | |
82e9bae6 | 1295 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1296 | |
82e9bae6 | 1297 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1298 | if (pn == NULL) |
1299 | return -ENOMEM; | |
1300 | pn->fioctl = fcn; | |
1301 | down_write(&snd_ioctl_rwsem); | |
1302 | list_add_tail(&pn->list, lists); | |
1303 | up_write(&snd_ioctl_rwsem); | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1308 | { | |
1309 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1310 | } | |
1311 | ||
c0d3fb39 TI |
1312 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1313 | ||
1da177e4 LT |
1314 | #ifdef CONFIG_COMPAT |
1315 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1316 | { | |
1317 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1318 | } | |
c0d3fb39 TI |
1319 | |
1320 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1321 | #endif |
1322 | ||
1323 | /* | |
1324 | * de-register the device-specific control-ioctls. | |
1325 | */ | |
82e9bae6 TI |
1326 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1327 | struct list_head *lists) | |
1da177e4 | 1328 | { |
82e9bae6 | 1329 | struct snd_kctl_ioctl *p; |
1da177e4 | 1330 | |
7c22f1aa | 1331 | snd_assert(fcn != NULL, return -EINVAL); |
1da177e4 | 1332 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1333 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1334 | if (p->fioctl == fcn) { |
1335 | list_del(&p->list); | |
1336 | up_write(&snd_ioctl_rwsem); | |
1337 | kfree(p); | |
1338 | return 0; | |
1339 | } | |
1340 | } | |
1341 | up_write(&snd_ioctl_rwsem); | |
1342 | snd_BUG(); | |
1343 | return -EINVAL; | |
1344 | } | |
1345 | ||
1346 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1347 | { | |
1348 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1349 | } | |
1350 | ||
c0d3fb39 TI |
1351 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1352 | ||
1da177e4 LT |
1353 | #ifdef CONFIG_COMPAT |
1354 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1355 | { | |
1356 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1357 | } | |
1358 | ||
c0d3fb39 | 1359 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1360 | #endif |
1361 | ||
1362 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1363 | { | |
82e9bae6 | 1364 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1365 | int err; |
1366 | ctl = file->private_data; | |
1367 | err = fasync_helper(fd, file, on, &ctl->fasync); | |
1368 | if (err < 0) | |
1369 | return err; | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * ioctl32 compat | |
1375 | */ | |
1376 | #ifdef CONFIG_COMPAT | |
1377 | #include "control_compat.c" | |
1378 | #else | |
1379 | #define snd_ctl_ioctl_compat NULL | |
1380 | #endif | |
1381 | ||
1382 | /* | |
1383 | * INIT PART | |
1384 | */ | |
1385 | ||
9c2e08c5 | 1386 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1387 | { |
1388 | .owner = THIS_MODULE, | |
1389 | .read = snd_ctl_read, | |
1390 | .open = snd_ctl_open, | |
1391 | .release = snd_ctl_release, | |
1392 | .poll = snd_ctl_poll, | |
1393 | .unlocked_ioctl = snd_ctl_ioctl, | |
1394 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1395 | .fasync = snd_ctl_fasync, | |
1396 | }; | |
1397 | ||
1da177e4 LT |
1398 | /* |
1399 | * registration of the control device | |
1400 | */ | |
82e9bae6 | 1401 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1402 | { |
82e9bae6 | 1403 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1404 | int err, cardnum; |
1405 | char name[16]; | |
1406 | ||
1407 | snd_assert(card != NULL, return -ENXIO); | |
1408 | cardnum = card->number; | |
1409 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1410 | sprintf(name, "controlC%i", cardnum); | |
f87135f5 CL |
1411 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1412 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1413 | return err; |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * disconnection of the control device | |
1419 | */ | |
82e9bae6 | 1420 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1421 | { |
82e9bae6 | 1422 | struct snd_card *card = device->device_data; |
82e9bae6 | 1423 | struct snd_ctl_file *ctl; |
c461482c TI |
1424 | int err, cardnum; |
1425 | ||
1426 | snd_assert(card != NULL, return -ENXIO); | |
1427 | cardnum = card->number; | |
1428 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1da177e4 LT |
1429 | |
1430 | down_read(&card->controls_rwsem); | |
9244b2c3 | 1431 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1432 | wake_up(&ctl->change_sleep); |
1433 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1434 | } | |
1435 | up_read(&card->controls_rwsem); | |
c461482c TI |
1436 | |
1437 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1438 | card, -1)) < 0) | |
1439 | return err; | |
1da177e4 LT |
1440 | return 0; |
1441 | } | |
1442 | ||
1443 | /* | |
1444 | * free all controls | |
1445 | */ | |
82e9bae6 | 1446 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1447 | { |
82e9bae6 TI |
1448 | struct snd_card *card = device->device_data; |
1449 | struct snd_kcontrol *control; | |
1da177e4 LT |
1450 | |
1451 | down_write(&card->controls_rwsem); | |
1452 | while (!list_empty(&card->controls)) { | |
1453 | control = snd_kcontrol(card->controls.next); | |
1454 | snd_ctl_remove(card, control); | |
1455 | } | |
1456 | up_write(&card->controls_rwsem); | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1da177e4 LT |
1460 | /* |
1461 | * create control core: | |
1462 | * called from init.c | |
1463 | */ | |
82e9bae6 | 1464 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1465 | { |
82e9bae6 | 1466 | static struct snd_device_ops ops = { |
1da177e4 LT |
1467 | .dev_free = snd_ctl_dev_free, |
1468 | .dev_register = snd_ctl_dev_register, | |
1469 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1470 | }; |
1471 | ||
1472 | snd_assert(card != NULL, return -ENXIO); | |
1473 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1474 | } | |
b9ed4f2b TI |
1475 | |
1476 | /* | |
1477 | * Frequently used control callbacks | |
1478 | */ | |
1479 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
1480 | struct snd_ctl_elem_info *uinfo) | |
1481 | { | |
1482 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1483 | uinfo->count = 1; | |
1484 | uinfo->value.integer.min = 0; | |
1485 | uinfo->value.integer.max = 1; | |
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); | |
1490 | ||
1491 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
1492 | struct snd_ctl_elem_info *uinfo) | |
1493 | { | |
1494 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1495 | uinfo->count = 2; | |
1496 | uinfo->value.integer.min = 0; | |
1497 | uinfo->value.integer.max = 1; | |
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |