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 | ||
22 | #include <sound/driver.h> | |
23 | #include <linux/threads.h> | |
24 | #include <linux/interrupt.h> | |
1da177e4 LT |
25 | #include <linux/slab.h> |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/time.h> | |
28 | #include <sound/core.h> | |
29 | #include <sound/minors.h> | |
30 | #include <sound/info.h> | |
31 | #include <sound/control.h> | |
32 | ||
33 | /* max number of user-defined controls */ | |
34 | #define MAX_USER_CONTROLS 32 | |
35 | ||
82e9bae6 | 36 | struct snd_kctl_ioctl { |
1da177e4 LT |
37 | struct list_head list; /* list of all ioctls */ |
38 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 39 | }; |
1da177e4 LT |
40 | |
41 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
42 | static LIST_HEAD(snd_control_ioctls); | |
43 | #ifdef CONFIG_COMPAT | |
44 | static LIST_HEAD(snd_control_compat_ioctls); | |
45 | #endif | |
46 | ||
47 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
48 | { | |
1da177e4 | 49 | unsigned long flags; |
82e9bae6 TI |
50 | struct snd_card *card; |
51 | struct snd_ctl_file *ctl; | |
1da177e4 LT |
52 | int err; |
53 | ||
f87135f5 | 54 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
55 | if (!card) { |
56 | err = -ENODEV; | |
57 | goto __error1; | |
58 | } | |
59 | err = snd_card_file_add(card, file); | |
60 | if (err < 0) { | |
61 | err = -ENODEV; | |
62 | goto __error1; | |
63 | } | |
64 | if (!try_module_get(card->module)) { | |
65 | err = -EFAULT; | |
66 | goto __error2; | |
67 | } | |
ca2c0966 | 68 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
69 | if (ctl == NULL) { |
70 | err = -ENOMEM; | |
71 | goto __error; | |
72 | } | |
73 | INIT_LIST_HEAD(&ctl->events); | |
74 | init_waitqueue_head(&ctl->change_sleep); | |
75 | spin_lock_init(&ctl->read_lock); | |
76 | ctl->card = card; | |
2529bba7 TI |
77 | ctl->prefer_pcm_subdevice = -1; |
78 | ctl->prefer_rawmidi_subdevice = -1; | |
1da177e4 LT |
79 | ctl->pid = current->pid; |
80 | file->private_data = ctl; | |
81 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
82 | list_add_tail(&ctl->list, &card->ctl_files); | |
83 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
84 | return 0; | |
85 | ||
86 | __error: | |
87 | module_put(card->module); | |
88 | __error2: | |
89 | snd_card_file_remove(card, file); | |
90 | __error1: | |
91 | return err; | |
92 | } | |
93 | ||
82e9bae6 | 94 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 95 | { |
7507e8da | 96 | unsigned long flags; |
82e9bae6 | 97 | struct snd_kctl_event *cread; |
1da177e4 | 98 | |
7507e8da | 99 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
100 | while (!list_empty(&ctl->events)) { |
101 | cread = snd_kctl_event(ctl->events.next); | |
102 | list_del(&cread->list); | |
103 | kfree(cread); | |
104 | } | |
7507e8da | 105 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
106 | } |
107 | ||
108 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
109 | { | |
110 | unsigned long flags; | |
82e9bae6 TI |
111 | struct snd_card *card; |
112 | struct snd_ctl_file *ctl; | |
113 | struct snd_kcontrol *control; | |
1da177e4 LT |
114 | unsigned int idx; |
115 | ||
116 | ctl = file->private_data; | |
117 | fasync_helper(-1, file, 0, &ctl->fasync); | |
118 | file->private_data = NULL; | |
119 | card = ctl->card; | |
120 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
121 | list_del(&ctl->list); | |
122 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
123 | down_write(&card->controls_rwsem); | |
9244b2c3 | 124 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
125 | for (idx = 0; idx < control->count; idx++) |
126 | if (control->vd[idx].owner == ctl) | |
127 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
128 | up_write(&card->controls_rwsem); |
129 | snd_ctl_empty_read_queue(ctl); | |
130 | kfree(ctl); | |
131 | module_put(card->module); | |
132 | snd_card_file_remove(card, file); | |
133 | return 0; | |
134 | } | |
135 | ||
82e9bae6 TI |
136 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
137 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
138 | { |
139 | unsigned long flags; | |
82e9bae6 TI |
140 | struct snd_ctl_file *ctl; |
141 | struct snd_kctl_event *ev; | |
1da177e4 | 142 | |
7c22f1aa | 143 | snd_assert(card != NULL && id != NULL, return); |
1da177e4 LT |
144 | read_lock(&card->ctl_files_rwlock); |
145 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
146 | card->mixer_oss_change_count++; | |
147 | #endif | |
9244b2c3 | 148 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
149 | if (!ctl->subscribed) |
150 | continue; | |
151 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 152 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
153 | if (ev->id.numid == id->numid) { |
154 | ev->mask |= mask; | |
155 | goto _found; | |
156 | } | |
157 | } | |
ca2c0966 | 158 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
159 | if (ev) { |
160 | ev->id = *id; | |
161 | ev->mask = mask; | |
162 | list_add_tail(&ev->list, &ctl->events); | |
163 | } else { | |
164 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
165 | } | |
166 | _found: | |
167 | wake_up(&ctl->change_sleep); | |
168 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
169 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
170 | } | |
171 | read_unlock(&card->ctl_files_rwlock); | |
172 | } | |
173 | ||
c0d3fb39 TI |
174 | EXPORT_SYMBOL(snd_ctl_notify); |
175 | ||
1da177e4 LT |
176 | /** |
177 | * snd_ctl_new - create a control instance from the template | |
178 | * @control: the control template | |
179 | * @access: the default control access | |
180 | * | |
82e9bae6 | 181 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
182 | * to the new instance. It does not copy volatile data (access). |
183 | * | |
184 | * Returns the pointer of the new instance, or NULL on failure. | |
185 | */ | |
0b51ba07 AB |
186 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
187 | unsigned int access) | |
1da177e4 | 188 | { |
82e9bae6 | 189 | struct snd_kcontrol *kctl; |
1da177e4 LT |
190 | unsigned int idx; |
191 | ||
7c22f1aa TI |
192 | snd_assert(control != NULL, return NULL); |
193 | snd_assert(control->count > 0, return NULL); | |
82e9bae6 | 194 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 TI |
195 | if (kctl == NULL) { |
196 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); | |
1da177e4 | 197 | return NULL; |
73e77ba0 | 198 | } |
1da177e4 LT |
199 | *kctl = *control; |
200 | for (idx = 0; idx < kctl->count; idx++) | |
201 | kctl->vd[idx].access = access; | |
202 | return kctl; | |
203 | } | |
204 | ||
205 | /** | |
206 | * snd_ctl_new1 - create a control instance from the template | |
207 | * @ncontrol: the initialization record | |
208 | * @private_data: the private data to set | |
209 | * | |
82e9bae6 | 210 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
211 | * template. When the access field of ncontrol is 0, it's assumed as |
212 | * READWRITE access. When the count field is 0, it's assumes as one. | |
213 | * | |
214 | * Returns the pointer of the newly generated instance, or NULL on failure. | |
215 | */ | |
82e9bae6 TI |
216 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
217 | void *private_data) | |
1da177e4 | 218 | { |
82e9bae6 | 219 | struct snd_kcontrol kctl; |
1da177e4 LT |
220 | unsigned int access; |
221 | ||
7c22f1aa | 222 | snd_assert(ncontrol != NULL, return NULL); |
1da177e4 LT |
223 | snd_assert(ncontrol->info != NULL, return NULL); |
224 | memset(&kctl, 0, sizeof(kctl)); | |
225 | kctl.id.iface = ncontrol->iface; | |
226 | kctl.id.device = ncontrol->device; | |
227 | kctl.id.subdevice = ncontrol->subdevice; | |
228 | if (ncontrol->name) | |
229 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); | |
230 | kctl.id.index = ncontrol->index; | |
231 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
232 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 JK |
233 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
234 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| | |
235 | SNDRV_CTL_ELEM_ACCESS_DINDIRECT| | |
236 | SNDRV_CTL_ELEM_ACCESS_INDIRECT| | |
237 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| | |
238 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
239 | kctl.info = ncontrol->info; |
240 | kctl.get = ncontrol->get; | |
241 | kctl.put = ncontrol->put; | |
8aa9b586 | 242 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
243 | kctl.private_value = ncontrol->private_value; |
244 | kctl.private_data = private_data; | |
245 | return snd_ctl_new(&kctl, access); | |
246 | } | |
247 | ||
c0d3fb39 TI |
248 | EXPORT_SYMBOL(snd_ctl_new1); |
249 | ||
1da177e4 LT |
250 | /** |
251 | * snd_ctl_free_one - release the control instance | |
252 | * @kcontrol: the control instance | |
253 | * | |
254 | * Releases the control instance created via snd_ctl_new() | |
255 | * or snd_ctl_new1(). | |
256 | * Don't call this after the control was added to the card. | |
257 | */ | |
82e9bae6 | 258 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
259 | { |
260 | if (kcontrol) { | |
261 | if (kcontrol->private_free) | |
262 | kcontrol->private_free(kcontrol); | |
263 | kfree(kcontrol); | |
264 | } | |
265 | } | |
266 | ||
c0d3fb39 TI |
267 | EXPORT_SYMBOL(snd_ctl_free_one); |
268 | ||
82e9bae6 | 269 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
1da177e4 LT |
270 | unsigned int count) |
271 | { | |
82e9bae6 | 272 | struct snd_kcontrol *kctl; |
1da177e4 | 273 | |
9244b2c3 | 274 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
275 | if ((kctl->id.numid <= card->last_numid && |
276 | kctl->id.numid + kctl->count > card->last_numid) || | |
277 | (kctl->id.numid <= card->last_numid + count - 1 && | |
278 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) | |
279 | return card->last_numid = kctl->id.numid + kctl->count - 1; | |
280 | } | |
281 | return card->last_numid; | |
282 | } | |
283 | ||
82e9bae6 | 284 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 LT |
285 | { |
286 | unsigned int last_numid, iter = 100000; | |
287 | ||
288 | last_numid = card->last_numid; | |
289 | while (last_numid != snd_ctl_hole_check(card, count)) { | |
290 | if (--iter == 0) { | |
291 | /* this situation is very unlikely */ | |
292 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
293 | return -ENOMEM; | |
294 | } | |
295 | last_numid = card->last_numid; | |
296 | } | |
297 | return 0; | |
298 | } | |
299 | ||
300 | /** | |
301 | * snd_ctl_add - add the control instance to the card | |
302 | * @card: the card instance | |
303 | * @kcontrol: the control instance to add | |
304 | * | |
305 | * Adds the control instance created via snd_ctl_new() or | |
306 | * snd_ctl_new1() to the given card. Assigns also an unique | |
307 | * numid used for fast search. | |
308 | * | |
309 | * Returns zero if successful, or a negative error code on failure. | |
310 | * | |
311 | * It frees automatically the control which cannot be added. | |
312 | */ | |
82e9bae6 | 313 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 314 | { |
82e9bae6 | 315 | struct snd_ctl_elem_id id; |
1da177e4 | 316 | unsigned int idx; |
c6077b30 | 317 | int err = -EINVAL; |
1da177e4 | 318 | |
73e77ba0 | 319 | if (! kcontrol) |
c6077b30 TI |
320 | return err; |
321 | snd_assert(card != NULL, goto error); | |
322 | snd_assert(kcontrol->info != NULL, goto error); | |
1da177e4 LT |
323 | id = kcontrol->id; |
324 | down_write(&card->controls_rwsem); | |
325 | if (snd_ctl_find_id(card, &id)) { | |
326 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
327 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
328 | id.iface, | |
329 | id.device, | |
330 | id.subdevice, | |
331 | id.name, | |
332 | id.index); | |
c6077b30 TI |
333 | err = -EBUSY; |
334 | goto error; | |
1da177e4 LT |
335 | } |
336 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
337 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
338 | err = -ENOMEM; |
339 | goto error; | |
1da177e4 LT |
340 | } |
341 | list_add_tail(&kcontrol->list, &card->controls); | |
342 | card->controls_count += kcontrol->count; | |
343 | kcontrol->id.numid = card->last_numid + 1; | |
344 | card->last_numid += kcontrol->count; | |
345 | up_write(&card->controls_rwsem); | |
346 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
347 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
348 | return 0; | |
c6077b30 TI |
349 | |
350 | error: | |
351 | snd_ctl_free_one(kcontrol); | |
352 | return err; | |
1da177e4 LT |
353 | } |
354 | ||
c0d3fb39 TI |
355 | EXPORT_SYMBOL(snd_ctl_add); |
356 | ||
1da177e4 LT |
357 | /** |
358 | * snd_ctl_remove - remove the control from the card and release it | |
359 | * @card: the card instance | |
360 | * @kcontrol: the control instance to remove | |
361 | * | |
362 | * Removes the control from the card and then releases the instance. | |
363 | * You don't need to call snd_ctl_free_one(). You must be in | |
364 | * the write lock - down_write(&card->controls_rwsem). | |
365 | * | |
366 | * Returns 0 if successful, or a negative error code on failure. | |
367 | */ | |
82e9bae6 | 368 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 369 | { |
82e9bae6 | 370 | struct snd_ctl_elem_id id; |
1da177e4 LT |
371 | unsigned int idx; |
372 | ||
7c22f1aa | 373 | snd_assert(card != NULL && kcontrol != NULL, return -EINVAL); |
1da177e4 LT |
374 | list_del(&kcontrol->list); |
375 | card->controls_count -= kcontrol->count; | |
376 | id = kcontrol->id; | |
377 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
378 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
379 | snd_ctl_free_one(kcontrol); | |
380 | return 0; | |
381 | } | |
382 | ||
c0d3fb39 TI |
383 | EXPORT_SYMBOL(snd_ctl_remove); |
384 | ||
1da177e4 LT |
385 | /** |
386 | * snd_ctl_remove_id - remove the control of the given id and release it | |
387 | * @card: the card instance | |
388 | * @id: the control id to remove | |
389 | * | |
390 | * Finds the control instance with the given id, removes it from the | |
391 | * card list and releases it. | |
392 | * | |
393 | * Returns 0 if successful, or a negative error code on failure. | |
394 | */ | |
82e9bae6 | 395 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 396 | { |
82e9bae6 | 397 | struct snd_kcontrol *kctl; |
1da177e4 LT |
398 | int ret; |
399 | ||
400 | down_write(&card->controls_rwsem); | |
401 | kctl = snd_ctl_find_id(card, id); | |
402 | if (kctl == NULL) { | |
403 | up_write(&card->controls_rwsem); | |
404 | return -ENOENT; | |
405 | } | |
406 | ret = snd_ctl_remove(card, kctl); | |
407 | up_write(&card->controls_rwsem); | |
408 | return ret; | |
409 | } | |
410 | ||
c0d3fb39 TI |
411 | EXPORT_SYMBOL(snd_ctl_remove_id); |
412 | ||
1da177e4 LT |
413 | /** |
414 | * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it | |
415 | * @file: active control handle | |
416 | * @id: the control id to remove | |
417 | * | |
418 | * Finds the control instance with the given id, removes it from the | |
419 | * card list and releases it. | |
420 | * | |
421 | * Returns 0 if successful, or a negative error code on failure. | |
422 | */ | |
82e9bae6 TI |
423 | static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file, |
424 | struct snd_ctl_elem_id *id) | |
1da177e4 | 425 | { |
82e9bae6 TI |
426 | struct snd_card *card = file->card; |
427 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
428 | int idx, ret; |
429 | ||
430 | down_write(&card->controls_rwsem); | |
431 | kctl = snd_ctl_find_id(card, id); | |
432 | if (kctl == NULL) { | |
433 | up_write(&card->controls_rwsem); | |
434 | return -ENOENT; | |
435 | } | |
436 | for (idx = 0; idx < kctl->count; idx++) | |
437 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
438 | up_write(&card->controls_rwsem); | |
439 | return -EBUSY; | |
440 | } | |
441 | ret = snd_ctl_remove(card, kctl); | |
442 | up_write(&card->controls_rwsem); | |
443 | return ret; | |
444 | } | |
445 | ||
446 | /** | |
447 | * snd_ctl_rename_id - replace the id of a control on the card | |
448 | * @card: the card instance | |
449 | * @src_id: the old id | |
450 | * @dst_id: the new id | |
451 | * | |
452 | * Finds the control with the old id from the card, and replaces the | |
453 | * id with the new one. | |
454 | * | |
455 | * Returns zero if successful, or a negative error code on failure. | |
456 | */ | |
82e9bae6 TI |
457 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
458 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 459 | { |
82e9bae6 | 460 | struct snd_kcontrol *kctl; |
1da177e4 LT |
461 | |
462 | down_write(&card->controls_rwsem); | |
463 | kctl = snd_ctl_find_id(card, src_id); | |
464 | if (kctl == NULL) { | |
465 | up_write(&card->controls_rwsem); | |
466 | return -ENOENT; | |
467 | } | |
468 | kctl->id = *dst_id; | |
469 | kctl->id.numid = card->last_numid + 1; | |
470 | card->last_numid += kctl->count; | |
471 | up_write(&card->controls_rwsem); | |
472 | return 0; | |
473 | } | |
474 | ||
c0d3fb39 TI |
475 | EXPORT_SYMBOL(snd_ctl_rename_id); |
476 | ||
1da177e4 LT |
477 | /** |
478 | * snd_ctl_find_numid - find the control instance with the given number-id | |
479 | * @card: the card instance | |
480 | * @numid: the number-id to search | |
481 | * | |
482 | * Finds the control instance with the given number-id from the card. | |
483 | * | |
484 | * Returns the pointer of the instance if found, or NULL if not. | |
485 | * | |
486 | * The caller must down card->controls_rwsem before calling this function | |
487 | * (if the race condition can happen). | |
488 | */ | |
82e9bae6 | 489 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 490 | { |
82e9bae6 | 491 | struct snd_kcontrol *kctl; |
1da177e4 | 492 | |
7c22f1aa | 493 | snd_assert(card != NULL && numid != 0, return NULL); |
9244b2c3 | 494 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
495 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
496 | return kctl; | |
497 | } | |
498 | return NULL; | |
499 | } | |
500 | ||
c0d3fb39 TI |
501 | EXPORT_SYMBOL(snd_ctl_find_numid); |
502 | ||
1da177e4 LT |
503 | /** |
504 | * snd_ctl_find_id - find the control instance with the given id | |
505 | * @card: the card instance | |
506 | * @id: the id to search | |
507 | * | |
508 | * Finds the control instance with the given id from the card. | |
509 | * | |
510 | * Returns the pointer of the instance if found, or NULL if not. | |
511 | * | |
512 | * The caller must down card->controls_rwsem before calling this function | |
513 | * (if the race condition can happen). | |
514 | */ | |
82e9bae6 TI |
515 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
516 | struct snd_ctl_elem_id *id) | |
1da177e4 | 517 | { |
82e9bae6 | 518 | struct snd_kcontrol *kctl; |
1da177e4 | 519 | |
7c22f1aa | 520 | snd_assert(card != NULL && id != NULL, return NULL); |
1da177e4 LT |
521 | if (id->numid != 0) |
522 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 523 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
524 | if (kctl->id.iface != id->iface) |
525 | continue; | |
526 | if (kctl->id.device != id->device) | |
527 | continue; | |
528 | if (kctl->id.subdevice != id->subdevice) | |
529 | continue; | |
530 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
531 | continue; | |
532 | if (kctl->id.index > id->index) | |
533 | continue; | |
534 | if (kctl->id.index + kctl->count <= id->index) | |
535 | continue; | |
536 | return kctl; | |
537 | } | |
538 | return NULL; | |
539 | } | |
540 | ||
c0d3fb39 TI |
541 | EXPORT_SYMBOL(snd_ctl_find_id); |
542 | ||
82e9bae6 | 543 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
544 | unsigned int cmd, void __user *arg) |
545 | { | |
82e9bae6 | 546 | struct snd_ctl_card_info *info; |
1da177e4 | 547 | |
ca2c0966 | 548 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
549 | if (! info) |
550 | return -ENOMEM; | |
551 | down_read(&snd_ioctl_rwsem); | |
552 | info->card = card->number; | |
553 | strlcpy(info->id, card->id, sizeof(info->id)); | |
554 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
555 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
556 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
557 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
558 | strlcpy(info->components, card->components, sizeof(info->components)); | |
559 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 560 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
561 | kfree(info); |
562 | return -EFAULT; | |
563 | } | |
564 | kfree(info); | |
565 | return 0; | |
566 | } | |
567 | ||
82e9bae6 TI |
568 | static int snd_ctl_elem_list(struct snd_card *card, |
569 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
570 | { |
571 | struct list_head *plist; | |
82e9bae6 TI |
572 | struct snd_ctl_elem_list list; |
573 | struct snd_kcontrol *kctl; | |
574 | struct snd_ctl_elem_id *dst, *id; | |
1da177e4 LT |
575 | unsigned int offset, space, first, jidx; |
576 | ||
577 | if (copy_from_user(&list, _list, sizeof(list))) | |
578 | return -EFAULT; | |
579 | offset = list.offset; | |
580 | space = list.space; | |
581 | first = 0; | |
582 | /* try limit maximum space */ | |
583 | if (space > 16384) | |
584 | return -ENOMEM; | |
585 | if (space > 0) { | |
586 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 587 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
588 | if (dst == NULL) |
589 | return -ENOMEM; | |
590 | down_read(&card->controls_rwsem); | |
591 | list.count = card->controls_count; | |
592 | plist = card->controls.next; | |
593 | while (plist != &card->controls) { | |
594 | if (offset == 0) | |
595 | break; | |
596 | kctl = snd_kcontrol(plist); | |
597 | if (offset < kctl->count) | |
598 | break; | |
599 | offset -= kctl->count; | |
600 | plist = plist->next; | |
601 | } | |
602 | list.used = 0; | |
603 | id = dst; | |
604 | while (space > 0 && plist != &card->controls) { | |
605 | kctl = snd_kcontrol(plist); | |
606 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
607 | snd_ctl_build_ioff(id, kctl, jidx); | |
608 | id++; | |
609 | space--; | |
610 | list.used++; | |
611 | } | |
612 | plist = plist->next; | |
613 | offset = 0; | |
614 | } | |
615 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
616 | if (list.used > 0 && |
617 | copy_to_user(list.pids, dst, | |
618 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
619 | vfree(dst); |
620 | return -EFAULT; | |
621 | } | |
622 | vfree(dst); | |
623 | } else { | |
624 | down_read(&card->controls_rwsem); | |
625 | list.count = card->controls_count; | |
626 | up_read(&card->controls_rwsem); | |
627 | } | |
628 | if (copy_to_user(_list, &list, sizeof(list))) | |
629 | return -EFAULT; | |
630 | return 0; | |
631 | } | |
632 | ||
82e9bae6 TI |
633 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
634 | struct snd_ctl_elem_info *info) | |
1da177e4 | 635 | { |
82e9bae6 TI |
636 | struct snd_card *card = ctl->card; |
637 | struct snd_kcontrol *kctl; | |
638 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
639 | unsigned int index_offset; |
640 | int result; | |
641 | ||
642 | down_read(&card->controls_rwsem); | |
643 | kctl = snd_ctl_find_id(card, &info->id); | |
644 | if (kctl == NULL) { | |
645 | up_read(&card->controls_rwsem); | |
646 | return -ENOENT; | |
647 | } | |
648 | #ifdef CONFIG_SND_DEBUG | |
649 | info->access = 0; | |
650 | #endif | |
651 | result = kctl->info(kctl, info); | |
652 | if (result >= 0) { | |
653 | snd_assert(info->access == 0, ); | |
654 | index_offset = snd_ctl_get_ioff(kctl, &info->id); | |
655 | vd = &kctl->vd[index_offset]; | |
656 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
657 | info->access = vd->access; | |
658 | if (vd->owner) { | |
659 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
660 | if (vd->owner == ctl) | |
661 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
662 | info->owner = vd->owner_pid; | |
663 | } else { | |
664 | info->owner = -1; | |
665 | } | |
666 | } | |
667 | up_read(&card->controls_rwsem); | |
668 | return result; | |
669 | } | |
670 | ||
82e9bae6 TI |
671 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
672 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 673 | { |
82e9bae6 | 674 | struct snd_ctl_elem_info info; |
1da177e4 LT |
675 | int result; |
676 | ||
677 | if (copy_from_user(&info, _info, sizeof(info))) | |
678 | return -EFAULT; | |
64649400 | 679 | snd_power_lock(ctl->card); |
cbac4b0c | 680 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
681 | if (result >= 0) |
682 | result = snd_ctl_elem_info(ctl, &info); | |
683 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
684 | if (result >= 0) |
685 | if (copy_to_user(_info, &info, sizeof(info))) | |
686 | return -EFAULT; | |
687 | return result; | |
688 | } | |
689 | ||
82e9bae6 | 690 | int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control) |
1da177e4 | 691 | { |
82e9bae6 TI |
692 | struct snd_kcontrol *kctl; |
693 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
694 | unsigned int index_offset; |
695 | int result, indirect; | |
696 | ||
697 | down_read(&card->controls_rwsem); | |
698 | kctl = snd_ctl_find_id(card, &control->id); | |
699 | if (kctl == NULL) { | |
700 | result = -ENOENT; | |
701 | } else { | |
702 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
703 | vd = &kctl->vd[index_offset]; | |
704 | indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0; | |
705 | if (control->indirect != indirect) { | |
706 | result = -EACCES; | |
707 | } else { | |
708 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get != NULL) { | |
709 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
710 | result = kctl->get(kctl, control); | |
711 | } else { | |
712 | result = -EPERM; | |
713 | } | |
714 | } | |
715 | } | |
716 | up_read(&card->controls_rwsem); | |
717 | return result; | |
718 | } | |
719 | ||
82e9bae6 TI |
720 | static int snd_ctl_elem_read_user(struct snd_card *card, |
721 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 722 | { |
82e9bae6 | 723 | struct snd_ctl_elem_value *control; |
1da177e4 LT |
724 | int result; |
725 | ||
726 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
727 | if (control == NULL) | |
728 | return -ENOMEM; | |
729 | if (copy_from_user(control, _control, sizeof(*control))) { | |
730 | kfree(control); | |
731 | return -EFAULT; | |
732 | } | |
64649400 | 733 | snd_power_lock(card); |
cbac4b0c | 734 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
735 | if (result >= 0) |
736 | result = snd_ctl_elem_read(card, control); | |
737 | snd_power_unlock(card); | |
1da177e4 LT |
738 | if (result >= 0) |
739 | if (copy_to_user(_control, control, sizeof(*control))) | |
740 | result = -EFAULT; | |
741 | kfree(control); | |
742 | return result; | |
743 | } | |
744 | ||
82e9bae6 TI |
745 | int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
746 | struct snd_ctl_elem_value *control) | |
1da177e4 | 747 | { |
82e9bae6 TI |
748 | struct snd_kcontrol *kctl; |
749 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
750 | unsigned int index_offset; |
751 | int result, indirect; | |
752 | ||
753 | down_read(&card->controls_rwsem); | |
754 | kctl = snd_ctl_find_id(card, &control->id); | |
755 | if (kctl == NULL) { | |
756 | result = -ENOENT; | |
757 | } else { | |
758 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
759 | vd = &kctl->vd[index_offset]; | |
760 | indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0; | |
761 | if (control->indirect != indirect) { | |
762 | result = -EACCES; | |
763 | } else { | |
764 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || | |
765 | kctl->put == NULL || | |
766 | (file && vd->owner != NULL && vd->owner != file)) { | |
767 | result = -EPERM; | |
768 | } else { | |
769 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
770 | result = kctl->put(kctl, control); | |
771 | } | |
772 | if (result > 0) { | |
773 | up_read(&card->controls_rwsem); | |
774 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &control->id); | |
775 | return 0; | |
776 | } | |
777 | } | |
778 | } | |
779 | up_read(&card->controls_rwsem); | |
780 | return result; | |
781 | } | |
782 | ||
82e9bae6 TI |
783 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
784 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 785 | { |
82e9bae6 | 786 | struct snd_ctl_elem_value *control; |
64649400 | 787 | struct snd_card *card; |
1da177e4 LT |
788 | int result; |
789 | ||
790 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
791 | if (control == NULL) | |
792 | return -ENOMEM; | |
793 | if (copy_from_user(control, _control, sizeof(*control))) { | |
794 | kfree(control); | |
795 | return -EFAULT; | |
796 | } | |
64649400 GP |
797 | card = file->card; |
798 | snd_power_lock(card); | |
cbac4b0c | 799 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
800 | if (result >= 0) |
801 | result = snd_ctl_elem_write(card, file, control); | |
802 | snd_power_unlock(card); | |
1da177e4 LT |
803 | if (result >= 0) |
804 | if (copy_to_user(_control, control, sizeof(*control))) | |
805 | result = -EFAULT; | |
806 | kfree(control); | |
807 | return result; | |
808 | } | |
809 | ||
82e9bae6 TI |
810 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
811 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 812 | { |
82e9bae6 TI |
813 | struct snd_card *card = file->card; |
814 | struct snd_ctl_elem_id id; | |
815 | struct snd_kcontrol *kctl; | |
816 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
817 | int result; |
818 | ||
819 | if (copy_from_user(&id, _id, sizeof(id))) | |
820 | return -EFAULT; | |
821 | down_write(&card->controls_rwsem); | |
822 | kctl = snd_ctl_find_id(card, &id); | |
823 | if (kctl == NULL) { | |
824 | result = -ENOENT; | |
825 | } else { | |
826 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
827 | if (vd->owner != NULL) | |
828 | result = -EBUSY; | |
829 | else { | |
830 | vd->owner = file; | |
831 | vd->owner_pid = current->pid; | |
832 | result = 0; | |
833 | } | |
834 | } | |
835 | up_write(&card->controls_rwsem); | |
836 | return result; | |
837 | } | |
838 | ||
82e9bae6 TI |
839 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
840 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 841 | { |
82e9bae6 TI |
842 | struct snd_card *card = file->card; |
843 | struct snd_ctl_elem_id id; | |
844 | struct snd_kcontrol *kctl; | |
845 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
846 | int result; |
847 | ||
848 | if (copy_from_user(&id, _id, sizeof(id))) | |
849 | return -EFAULT; | |
850 | down_write(&card->controls_rwsem); | |
851 | kctl = snd_ctl_find_id(card, &id); | |
852 | if (kctl == NULL) { | |
853 | result = -ENOENT; | |
854 | } else { | |
855 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
856 | if (vd->owner == NULL) | |
857 | result = -EINVAL; | |
858 | else if (vd->owner != file) | |
859 | result = -EPERM; | |
860 | else { | |
861 | vd->owner = NULL; | |
862 | vd->owner_pid = 0; | |
863 | result = 0; | |
864 | } | |
865 | } | |
866 | up_write(&card->controls_rwsem); | |
867 | return result; | |
868 | } | |
869 | ||
870 | struct user_element { | |
82e9bae6 | 871 | struct snd_ctl_elem_info info; |
1da177e4 LT |
872 | void *elem_data; /* element data */ |
873 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
874 | void *tlv_data; /* TLV data */ |
875 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 LT |
876 | void *priv_data; /* private data (like strings for enumerated type) */ |
877 | unsigned long priv_data_size; /* size of private data in bytes */ | |
878 | }; | |
879 | ||
82e9bae6 TI |
880 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
881 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
882 | { |
883 | struct user_element *ue = kcontrol->private_data; | |
884 | ||
885 | *uinfo = ue->info; | |
886 | return 0; | |
887 | } | |
888 | ||
82e9bae6 TI |
889 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
890 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
891 | { |
892 | struct user_element *ue = kcontrol->private_data; | |
893 | ||
894 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
895 | return 0; | |
896 | } | |
897 | ||
82e9bae6 TI |
898 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
899 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
900 | { |
901 | int change; | |
902 | struct user_element *ue = kcontrol->private_data; | |
903 | ||
904 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
905 | if (change) | |
906 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
907 | return change; | |
908 | } | |
909 | ||
8aa9b586 JK |
910 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
911 | int op_flag, | |
912 | unsigned int size, | |
913 | unsigned int __user *tlv) | |
914 | { | |
915 | struct user_element *ue = kcontrol->private_data; | |
916 | int change = 0; | |
917 | void *new_data; | |
918 | ||
919 | if (op_flag > 0) { | |
920 | if (size > 1024 * 128) /* sane value */ | |
921 | return -EINVAL; | |
922 | new_data = kmalloc(size, GFP_KERNEL); | |
923 | if (new_data == NULL) | |
924 | return -ENOMEM; | |
925 | if (copy_from_user(new_data, tlv, size)) { | |
926 | kfree(new_data); | |
927 | return -EFAULT; | |
928 | } | |
929 | change = ue->tlv_data_size != size; | |
930 | if (!change) | |
931 | change = memcmp(ue->tlv_data, new_data, size); | |
932 | kfree(ue->tlv_data); | |
933 | ue->tlv_data = new_data; | |
934 | ue->tlv_data_size = size; | |
935 | } else { | |
18c1c3f6 TI |
936 | if (! ue->tlv_data_size || ! ue->tlv_data) |
937 | return -ENXIO; | |
8aa9b586 JK |
938 | if (size < ue->tlv_data_size) |
939 | return -ENOSPC; | |
940 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) | |
941 | return -EFAULT; | |
942 | } | |
943 | return change; | |
944 | } | |
945 | ||
82e9bae6 | 946 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 947 | { |
8aa9b586 JK |
948 | struct user_element *ue = kcontrol->private_data; |
949 | if (ue->tlv_data) | |
950 | kfree(ue->tlv_data); | |
951 | kfree(ue); | |
1da177e4 LT |
952 | } |
953 | ||
82e9bae6 TI |
954 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
955 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 956 | { |
82e9bae6 TI |
957 | struct snd_card *card = file->card; |
958 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
959 | unsigned int access; |
960 | long private_size; | |
961 | struct user_element *ue; | |
962 | int idx, err; | |
963 | ||
964 | if (card->user_ctl_count >= MAX_USER_CONTROLS) | |
965 | return -ENOMEM; | |
966 | if (info->count > 1024) | |
967 | return -EINVAL; | |
968 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 969 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
970 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
971 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
972 | info->id.numid = 0; |
973 | memset(&kctl, 0, sizeof(kctl)); | |
974 | down_write(&card->controls_rwsem); | |
975 | _kctl = snd_ctl_find_id(card, &info->id); | |
976 | err = 0; | |
977 | if (_kctl) { | |
978 | if (replace) | |
979 | err = snd_ctl_remove(card, _kctl); | |
980 | else | |
981 | err = -EBUSY; | |
982 | } else { | |
983 | if (replace) | |
984 | err = -ENOENT; | |
985 | } | |
986 | up_write(&card->controls_rwsem); | |
987 | if (err < 0) | |
988 | return err; | |
989 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
990 | kctl.count = info->owner ? info->owner : 1; | |
991 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
992 | kctl.info = snd_ctl_elem_user_info; | |
993 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
994 | kctl.get = snd_ctl_elem_user_get; | |
995 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
996 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
997 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
998 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
999 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
1000 | } | |
1da177e4 LT |
1001 | switch (info->type) { |
1002 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
1003 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1004 | private_size = sizeof(long); | |
1005 | if (info->count > 128) | |
1006 | return -EINVAL; | |
1007 | break; | |
1008 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
1009 | private_size = sizeof(long long); | |
1010 | if (info->count > 64) | |
1011 | return -EINVAL; | |
1012 | break; | |
1013 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
1014 | private_size = sizeof(unsigned char); | |
1015 | if (info->count > 512) | |
1016 | return -EINVAL; | |
1017 | break; | |
1018 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1019 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1020 | if (info->count != 1) |
1021 | return -EINVAL; | |
1022 | break; | |
1023 | default: | |
1024 | return -EINVAL; | |
1025 | } | |
1026 | private_size *= info->count; | |
ca2c0966 | 1027 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1028 | if (ue == NULL) |
1029 | return -ENOMEM; | |
1030 | ue->info = *info; | |
86148e84 | 1031 | ue->info.access = 0; |
1da177e4 LT |
1032 | ue->elem_data = (char *)ue + sizeof(*ue); |
1033 | ue->elem_data_size = private_size; | |
1034 | kctl.private_free = snd_ctl_elem_user_free; | |
1035 | _kctl = snd_ctl_new(&kctl, access); | |
1036 | if (_kctl == NULL) { | |
2fbf182e | 1037 | kfree(ue); |
1da177e4 LT |
1038 | return -ENOMEM; |
1039 | } | |
1040 | _kctl->private_data = ue; | |
1041 | for (idx = 0; idx < _kctl->count; idx++) | |
1042 | _kctl->vd[idx].owner = file; | |
1043 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1044 | if (err < 0) |
1da177e4 | 1045 | return err; |
1da177e4 LT |
1046 | |
1047 | down_write(&card->controls_rwsem); | |
1048 | card->user_ctl_count++; | |
1049 | up_write(&card->controls_rwsem); | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
82e9bae6 TI |
1054 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1055 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1056 | { |
82e9bae6 | 1057 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1058 | if (copy_from_user(&info, _info, sizeof(info))) |
1059 | return -EFAULT; | |
1060 | return snd_ctl_elem_add(file, &info, replace); | |
1061 | } | |
1062 | ||
82e9bae6 TI |
1063 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1064 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1065 | { |
82e9bae6 | 1066 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1067 | int err; |
1068 | ||
1069 | if (copy_from_user(&id, _id, sizeof(id))) | |
1070 | return -EFAULT; | |
1071 | err = snd_ctl_remove_unlocked_id(file, &id); | |
1072 | if (! err) { | |
82e9bae6 | 1073 | struct snd_card *card = file->card; |
1da177e4 LT |
1074 | down_write(&card->controls_rwsem); |
1075 | card->user_ctl_count--; | |
1076 | up_write(&card->controls_rwsem); | |
1077 | } | |
1078 | return err; | |
1079 | } | |
1080 | ||
82e9bae6 | 1081 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1082 | { |
1083 | int subscribe; | |
1084 | if (get_user(subscribe, ptr)) | |
1085 | return -EFAULT; | |
1086 | if (subscribe < 0) { | |
1087 | subscribe = file->subscribed; | |
1088 | if (put_user(subscribe, ptr)) | |
1089 | return -EFAULT; | |
1090 | return 0; | |
1091 | } | |
1092 | if (subscribe) { | |
1093 | file->subscribed = 1; | |
1094 | return 0; | |
1095 | } else if (file->subscribed) { | |
1096 | snd_ctl_empty_read_queue(file); | |
1097 | file->subscribed = 0; | |
1098 | } | |
1099 | return 0; | |
1100 | } | |
1101 | ||
8aa9b586 JK |
1102 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1103 | struct snd_ctl_tlv __user *_tlv, | |
1104 | int op_flag) | |
42750b04 | 1105 | { |
8aa9b586 | 1106 | struct snd_card *card = file->card; |
42750b04 JK |
1107 | struct snd_ctl_tlv tlv; |
1108 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1109 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1110 | unsigned int len; |
1111 | int err = 0; | |
1112 | ||
1113 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1114 | return -EFAULT; | |
8aa9b586 JK |
1115 | if (tlv.length < sizeof(unsigned int) * 3) |
1116 | return -EINVAL; | |
1117 | down_read(&card->controls_rwsem); | |
1118 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1119 | if (kctl == NULL) { | |
1120 | err = -ENOENT; | |
1121 | goto __kctl_end; | |
1122 | } | |
1123 | if (kctl->tlv.p == NULL) { | |
1124 | err = -ENXIO; | |
1125 | goto __kctl_end; | |
1126 | } | |
1127 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1128 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1129 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1130 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1131 | err = -ENXIO; | |
1132 | goto __kctl_end; | |
1133 | } | |
1134 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
1135 | if (file && vd->owner != NULL && vd->owner != file) { | |
1136 | err = -EPERM; | |
1137 | goto __kctl_end; | |
1138 | } | |
1139 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); | |
1140 | if (err > 0) { | |
1141 | up_read(&card->controls_rwsem); | |
1142 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1143 | return 0; | |
1144 | } | |
1145 | } else { | |
1146 | if (op_flag) { | |
1147 | err = -ENXIO; | |
1148 | goto __kctl_end; | |
1149 | } | |
1150 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1151 | if (tlv.length < len) { | |
1152 | err = -ENOMEM; | |
1153 | goto __kctl_end; | |
1154 | } | |
1155 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1156 | err = -EFAULT; | |
1157 | } | |
42750b04 | 1158 | __kctl_end: |
8aa9b586 JK |
1159 | up_read(&card->controls_rwsem); |
1160 | return err; | |
42750b04 JK |
1161 | } |
1162 | ||
1da177e4 LT |
1163 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1164 | { | |
82e9bae6 TI |
1165 | struct snd_ctl_file *ctl; |
1166 | struct snd_card *card; | |
82e9bae6 | 1167 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1168 | void __user *argp = (void __user *)arg; |
1169 | int __user *ip = argp; | |
1170 | int err; | |
1171 | ||
1172 | ctl = file->private_data; | |
1173 | card = ctl->card; | |
1174 | snd_assert(card != NULL, return -ENXIO); | |
1175 | switch (cmd) { | |
1176 | case SNDRV_CTL_IOCTL_PVERSION: | |
1177 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1178 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1179 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1180 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1181 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1182 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1183 | return snd_ctl_elem_info_user(ctl, argp); | |
1184 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1185 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1186 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1187 | return snd_ctl_elem_write_user(ctl, argp); | |
1188 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1189 | return snd_ctl_elem_lock(ctl, argp); | |
1190 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1191 | return snd_ctl_elem_unlock(ctl, argp); | |
1192 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1193 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1194 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1195 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1196 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1197 | return snd_ctl_elem_remove(ctl, argp); | |
1198 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1199 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 JK |
1200 | case SNDRV_CTL_IOCTL_TLV_READ: |
1201 | return snd_ctl_tlv_ioctl(ctl, argp, 0); | |
1202 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
1203 | return snd_ctl_tlv_ioctl(ctl, argp, 1); | |
1204 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1205 | return snd_ctl_tlv_ioctl(ctl, argp, -1); | |
1da177e4 | 1206 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1207 | return -ENOPROTOOPT; |
1da177e4 LT |
1208 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1209 | #ifdef CONFIG_PM | |
1210 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1211 | #else | |
1212 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1213 | #endif | |
1214 | } | |
1215 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1216 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1217 | err = p->fioctl(card, ctl, cmd, arg); |
1218 | if (err != -ENOIOCTLCMD) { | |
1219 | up_read(&snd_ioctl_rwsem); | |
1220 | return err; | |
1221 | } | |
1222 | } | |
1223 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1224 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1225 | return -ENOTTY; |
1226 | } | |
1227 | ||
82e9bae6 TI |
1228 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1229 | size_t count, loff_t * offset) | |
1da177e4 | 1230 | { |
82e9bae6 | 1231 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1232 | int err = 0; |
1233 | ssize_t result = 0; | |
1234 | ||
1235 | ctl = file->private_data; | |
1236 | snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO); | |
1237 | if (!ctl->subscribed) | |
1238 | return -EBADFD; | |
82e9bae6 | 1239 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1240 | return -EINVAL; |
1241 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1242 | while (count >= sizeof(struct snd_ctl_event)) { |
1243 | struct snd_ctl_event ev; | |
1244 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1245 | while (list_empty(&ctl->events)) { |
1246 | wait_queue_t wait; | |
1247 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1248 | err = -EAGAIN; | |
1249 | goto __end_lock; | |
1250 | } | |
1251 | init_waitqueue_entry(&wait, current); | |
1252 | add_wait_queue(&ctl->change_sleep, &wait); | |
1253 | set_current_state(TASK_INTERRUPTIBLE); | |
1254 | spin_unlock_irq(&ctl->read_lock); | |
1255 | schedule(); | |
1256 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1257 | if (signal_pending(current)) | |
0e5d720c | 1258 | return -ERESTARTSYS; |
1da177e4 LT |
1259 | spin_lock_irq(&ctl->read_lock); |
1260 | } | |
1261 | kev = snd_kctl_event(ctl->events.next); | |
1262 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1263 | ev.data.elem.mask = kev->mask; | |
1264 | ev.data.elem.id = kev->id; | |
1265 | list_del(&kev->list); | |
1266 | spin_unlock_irq(&ctl->read_lock); | |
1267 | kfree(kev); | |
82e9bae6 | 1268 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1269 | err = -EFAULT; |
1270 | goto __end; | |
1271 | } | |
1272 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1273 | buffer += sizeof(struct snd_ctl_event); |
1274 | count -= sizeof(struct snd_ctl_event); | |
1275 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1276 | } |
1277 | __end_lock: | |
1278 | spin_unlock_irq(&ctl->read_lock); | |
1279 | __end: | |
1280 | return result > 0 ? result : err; | |
1281 | } | |
1282 | ||
1283 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1284 | { | |
1285 | unsigned int mask; | |
82e9bae6 | 1286 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1287 | |
1288 | ctl = file->private_data; | |
1289 | if (!ctl->subscribed) | |
1290 | return 0; | |
1291 | poll_wait(file, &ctl->change_sleep, wait); | |
1292 | ||
1293 | mask = 0; | |
1294 | if (!list_empty(&ctl->events)) | |
1295 | mask |= POLLIN | POLLRDNORM; | |
1296 | ||
1297 | return mask; | |
1298 | } | |
1299 | ||
1300 | /* | |
1301 | * register the device-specific control-ioctls. | |
1302 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1303 | */ | |
1304 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1305 | { | |
82e9bae6 | 1306 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1307 | |
82e9bae6 | 1308 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1309 | if (pn == NULL) |
1310 | return -ENOMEM; | |
1311 | pn->fioctl = fcn; | |
1312 | down_write(&snd_ioctl_rwsem); | |
1313 | list_add_tail(&pn->list, lists); | |
1314 | up_write(&snd_ioctl_rwsem); | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1319 | { | |
1320 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1321 | } | |
1322 | ||
c0d3fb39 TI |
1323 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1324 | ||
1da177e4 LT |
1325 | #ifdef CONFIG_COMPAT |
1326 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1327 | { | |
1328 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1329 | } | |
c0d3fb39 TI |
1330 | |
1331 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1332 | #endif |
1333 | ||
1334 | /* | |
1335 | * de-register the device-specific control-ioctls. | |
1336 | */ | |
82e9bae6 TI |
1337 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1338 | struct list_head *lists) | |
1da177e4 | 1339 | { |
82e9bae6 | 1340 | struct snd_kctl_ioctl *p; |
1da177e4 | 1341 | |
7c22f1aa | 1342 | snd_assert(fcn != NULL, return -EINVAL); |
1da177e4 | 1343 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1344 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1345 | if (p->fioctl == fcn) { |
1346 | list_del(&p->list); | |
1347 | up_write(&snd_ioctl_rwsem); | |
1348 | kfree(p); | |
1349 | return 0; | |
1350 | } | |
1351 | } | |
1352 | up_write(&snd_ioctl_rwsem); | |
1353 | snd_BUG(); | |
1354 | return -EINVAL; | |
1355 | } | |
1356 | ||
1357 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1358 | { | |
1359 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1360 | } | |
1361 | ||
c0d3fb39 TI |
1362 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1363 | ||
1da177e4 LT |
1364 | #ifdef CONFIG_COMPAT |
1365 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1366 | { | |
1367 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1368 | } | |
1369 | ||
c0d3fb39 | 1370 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1371 | #endif |
1372 | ||
1373 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1374 | { | |
82e9bae6 | 1375 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1376 | int err; |
1377 | ctl = file->private_data; | |
1378 | err = fasync_helper(fd, file, on, &ctl->fasync); | |
1379 | if (err < 0) | |
1380 | return err; | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * ioctl32 compat | |
1386 | */ | |
1387 | #ifdef CONFIG_COMPAT | |
1388 | #include "control_compat.c" | |
1389 | #else | |
1390 | #define snd_ctl_ioctl_compat NULL | |
1391 | #endif | |
1392 | ||
1393 | /* | |
1394 | * INIT PART | |
1395 | */ | |
1396 | ||
9c2e08c5 | 1397 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1398 | { |
1399 | .owner = THIS_MODULE, | |
1400 | .read = snd_ctl_read, | |
1401 | .open = snd_ctl_open, | |
1402 | .release = snd_ctl_release, | |
1403 | .poll = snd_ctl_poll, | |
1404 | .unlocked_ioctl = snd_ctl_ioctl, | |
1405 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1406 | .fasync = snd_ctl_fasync, | |
1407 | }; | |
1408 | ||
1da177e4 LT |
1409 | /* |
1410 | * registration of the control device | |
1411 | */ | |
82e9bae6 | 1412 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1413 | { |
82e9bae6 | 1414 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1415 | int err, cardnum; |
1416 | char name[16]; | |
1417 | ||
1418 | snd_assert(card != NULL, return -ENXIO); | |
1419 | cardnum = card->number; | |
1420 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1421 | sprintf(name, "controlC%i", cardnum); | |
f87135f5 CL |
1422 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1423 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1424 | return err; |
1425 | return 0; | |
1426 | } | |
1427 | ||
1428 | /* | |
1429 | * disconnection of the control device | |
1430 | */ | |
82e9bae6 | 1431 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1432 | { |
82e9bae6 | 1433 | struct snd_card *card = device->device_data; |
82e9bae6 | 1434 | struct snd_ctl_file *ctl; |
c461482c TI |
1435 | int err, cardnum; |
1436 | ||
1437 | snd_assert(card != NULL, return -ENXIO); | |
1438 | cardnum = card->number; | |
1439 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1da177e4 LT |
1440 | |
1441 | down_read(&card->controls_rwsem); | |
9244b2c3 | 1442 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1443 | wake_up(&ctl->change_sleep); |
1444 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1445 | } | |
1446 | up_read(&card->controls_rwsem); | |
c461482c TI |
1447 | |
1448 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1449 | card, -1)) < 0) | |
1450 | return err; | |
1da177e4 LT |
1451 | return 0; |
1452 | } | |
1453 | ||
1454 | /* | |
1455 | * free all controls | |
1456 | */ | |
82e9bae6 | 1457 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1458 | { |
82e9bae6 TI |
1459 | struct snd_card *card = device->device_data; |
1460 | struct snd_kcontrol *control; | |
1da177e4 LT |
1461 | |
1462 | down_write(&card->controls_rwsem); | |
1463 | while (!list_empty(&card->controls)) { | |
1464 | control = snd_kcontrol(card->controls.next); | |
1465 | snd_ctl_remove(card, control); | |
1466 | } | |
1467 | up_write(&card->controls_rwsem); | |
1468 | return 0; | |
1469 | } | |
1470 | ||
1da177e4 LT |
1471 | /* |
1472 | * create control core: | |
1473 | * called from init.c | |
1474 | */ | |
82e9bae6 | 1475 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1476 | { |
82e9bae6 | 1477 | static struct snd_device_ops ops = { |
1da177e4 LT |
1478 | .dev_free = snd_ctl_dev_free, |
1479 | .dev_register = snd_ctl_dev_register, | |
1480 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1481 | }; |
1482 | ||
1483 | snd_assert(card != NULL, return -ENXIO); | |
1484 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1485 | } | |
b9ed4f2b TI |
1486 | |
1487 | /* | |
1488 | * Frequently used control callbacks | |
1489 | */ | |
1490 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
1491 | struct snd_ctl_elem_info *uinfo) | |
1492 | { | |
1493 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1494 | uinfo->count = 1; | |
1495 | uinfo->value.integer.min = 0; | |
1496 | uinfo->value.integer.max = 1; | |
1497 | return 0; | |
1498 | } | |
1499 | ||
1500 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); | |
1501 | ||
1502 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
1503 | struct snd_ctl_elem_info *uinfo) | |
1504 | { | |
1505 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1506 | uinfo->count = 2; | |
1507 | uinfo->value.integer.min = 0; | |
1508 | uinfo->value.integer.max = 1; | |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |