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; | |
25d27ede | 78 | ctl->pid = get_pid(task_pid(current)); |
1da177e4 LT |
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; | |
1da177e4 LT |
116 | file->private_data = NULL; |
117 | card = ctl->card; | |
118 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
119 | list_del(&ctl->list); | |
120 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
121 | down_write(&card->controls_rwsem); | |
9244b2c3 | 122 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
123 | for (idx = 0; idx < control->count; idx++) |
124 | if (control->vd[idx].owner == ctl) | |
125 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
126 | up_write(&card->controls_rwsem); |
127 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 128 | put_pid(ctl->pid); |
1da177e4 LT |
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 | |
7eaa943c TI |
142 | if (snd_BUG_ON(!card || !id)) |
143 | 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 | ||
7eaa943c TI |
192 | if (snd_BUG_ON(!control || !control->count)) |
193 | 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 | ||
7eaa943c TI |
222 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
223 | return NULL; | |
1da177e4 LT |
224 | memset(&kctl, 0, sizeof(kctl)); |
225 | kctl.id.iface = ncontrol->iface; | |
226 | kctl.id.device = ncontrol->device; | |
227 | kctl.id.subdevice = ncontrol->subdevice; | |
366840d7 | 228 | if (ncontrol->name) { |
1da177e4 | 229 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
366840d7 MB |
230 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
231 | snd_printk(KERN_WARNING | |
232 | "Control name '%s' truncated to '%s'\n", | |
233 | ncontrol->name, kctl.id.name); | |
234 | } | |
1da177e4 LT |
235 | kctl.id.index = ncontrol->index; |
236 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
237 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 JK |
238 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
239 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| | |
a75d7a4c CL |
240 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
241 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| | |
242 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
243 | kctl.info = ncontrol->info; |
244 | kctl.get = ncontrol->get; | |
245 | kctl.put = ncontrol->put; | |
8aa9b586 | 246 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
247 | kctl.private_value = ncontrol->private_value; |
248 | kctl.private_data = private_data; | |
249 | return snd_ctl_new(&kctl, access); | |
250 | } | |
251 | ||
c0d3fb39 TI |
252 | EXPORT_SYMBOL(snd_ctl_new1); |
253 | ||
1da177e4 LT |
254 | /** |
255 | * snd_ctl_free_one - release the control instance | |
256 | * @kcontrol: the control instance | |
257 | * | |
258 | * Releases the control instance created via snd_ctl_new() | |
259 | * or snd_ctl_new1(). | |
260 | * Don't call this after the control was added to the card. | |
261 | */ | |
82e9bae6 | 262 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
263 | { |
264 | if (kcontrol) { | |
265 | if (kcontrol->private_free) | |
266 | kcontrol->private_free(kcontrol); | |
267 | kfree(kcontrol); | |
268 | } | |
269 | } | |
270 | ||
c0d3fb39 TI |
271 | EXPORT_SYMBOL(snd_ctl_free_one); |
272 | ||
82e9bae6 | 273 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
1da177e4 LT |
274 | unsigned int count) |
275 | { | |
82e9bae6 | 276 | struct snd_kcontrol *kctl; |
1da177e4 | 277 | |
9244b2c3 | 278 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
279 | if ((kctl->id.numid <= card->last_numid && |
280 | kctl->id.numid + kctl->count > card->last_numid) || | |
281 | (kctl->id.numid <= card->last_numid + count - 1 && | |
282 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) | |
283 | return card->last_numid = kctl->id.numid + kctl->count - 1; | |
284 | } | |
285 | return card->last_numid; | |
286 | } | |
287 | ||
82e9bae6 | 288 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 LT |
289 | { |
290 | unsigned int last_numid, iter = 100000; | |
291 | ||
292 | last_numid = card->last_numid; | |
293 | while (last_numid != snd_ctl_hole_check(card, count)) { | |
294 | if (--iter == 0) { | |
295 | /* this situation is very unlikely */ | |
296 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
297 | return -ENOMEM; | |
298 | } | |
299 | last_numid = card->last_numid; | |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
304 | /** | |
305 | * snd_ctl_add - add the control instance to the card | |
306 | * @card: the card instance | |
307 | * @kcontrol: the control instance to add | |
308 | * | |
309 | * Adds the control instance created via snd_ctl_new() or | |
310 | * snd_ctl_new1() to the given card. Assigns also an unique | |
311 | * numid used for fast search. | |
312 | * | |
313 | * Returns zero if successful, or a negative error code on failure. | |
314 | * | |
315 | * It frees automatically the control which cannot be added. | |
316 | */ | |
82e9bae6 | 317 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 318 | { |
82e9bae6 | 319 | struct snd_ctl_elem_id id; |
1da177e4 | 320 | unsigned int idx; |
c6077b30 | 321 | int err = -EINVAL; |
1da177e4 | 322 | |
73e77ba0 | 323 | if (! kcontrol) |
c6077b30 | 324 | return err; |
7eaa943c TI |
325 | if (snd_BUG_ON(!card || !kcontrol->info)) |
326 | goto error; | |
1da177e4 LT |
327 | id = kcontrol->id; |
328 | down_write(&card->controls_rwsem); | |
329 | if (snd_ctl_find_id(card, &id)) { | |
330 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
331 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
332 | id.iface, | |
333 | id.device, | |
334 | id.subdevice, | |
335 | id.name, | |
336 | id.index); | |
c6077b30 TI |
337 | err = -EBUSY; |
338 | goto error; | |
1da177e4 LT |
339 | } |
340 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
341 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
342 | err = -ENOMEM; |
343 | goto error; | |
1da177e4 LT |
344 | } |
345 | list_add_tail(&kcontrol->list, &card->controls); | |
346 | card->controls_count += kcontrol->count; | |
347 | kcontrol->id.numid = card->last_numid + 1; | |
348 | card->last_numid += kcontrol->count; | |
349 | up_write(&card->controls_rwsem); | |
350 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
351 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
352 | return 0; | |
c6077b30 TI |
353 | |
354 | error: | |
355 | snd_ctl_free_one(kcontrol); | |
356 | return err; | |
1da177e4 LT |
357 | } |
358 | ||
c0d3fb39 TI |
359 | EXPORT_SYMBOL(snd_ctl_add); |
360 | ||
1da177e4 LT |
361 | /** |
362 | * snd_ctl_remove - remove the control from the card and release it | |
363 | * @card: the card instance | |
364 | * @kcontrol: the control instance to remove | |
365 | * | |
366 | * Removes the control from the card and then releases the instance. | |
367 | * You don't need to call snd_ctl_free_one(). You must be in | |
368 | * the write lock - down_write(&card->controls_rwsem). | |
369 | * | |
370 | * Returns 0 if successful, or a negative error code on failure. | |
371 | */ | |
82e9bae6 | 372 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 373 | { |
82e9bae6 | 374 | struct snd_ctl_elem_id id; |
1da177e4 LT |
375 | unsigned int idx; |
376 | ||
7eaa943c TI |
377 | if (snd_BUG_ON(!card || !kcontrol)) |
378 | return -EINVAL; | |
1da177e4 LT |
379 | list_del(&kcontrol->list); |
380 | card->controls_count -= kcontrol->count; | |
381 | id = kcontrol->id; | |
382 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
383 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
384 | snd_ctl_free_one(kcontrol); | |
385 | return 0; | |
386 | } | |
387 | ||
c0d3fb39 TI |
388 | EXPORT_SYMBOL(snd_ctl_remove); |
389 | ||
1da177e4 LT |
390 | /** |
391 | * snd_ctl_remove_id - remove the control of the given id and release it | |
392 | * @card: the card instance | |
393 | * @id: the control id to remove | |
394 | * | |
395 | * Finds the control instance with the given id, removes it from the | |
396 | * card list and releases it. | |
397 | * | |
398 | * Returns 0 if successful, or a negative error code on failure. | |
399 | */ | |
82e9bae6 | 400 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 401 | { |
82e9bae6 | 402 | struct snd_kcontrol *kctl; |
1da177e4 LT |
403 | int ret; |
404 | ||
405 | down_write(&card->controls_rwsem); | |
406 | kctl = snd_ctl_find_id(card, id); | |
407 | if (kctl == NULL) { | |
408 | up_write(&card->controls_rwsem); | |
409 | return -ENOENT; | |
410 | } | |
411 | ret = snd_ctl_remove(card, kctl); | |
412 | up_write(&card->controls_rwsem); | |
413 | return ret; | |
414 | } | |
415 | ||
c0d3fb39 TI |
416 | EXPORT_SYMBOL(snd_ctl_remove_id); |
417 | ||
1da177e4 | 418 | /** |
f217ac59 | 419 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
420 | * @file: active control handle |
421 | * @id: the control id to remove | |
422 | * | |
423 | * Finds the control instance with the given id, removes it from the | |
424 | * card list and releases it. | |
425 | * | |
426 | * Returns 0 if successful, or a negative error code on failure. | |
427 | */ | |
f217ac59 CL |
428 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
429 | struct snd_ctl_elem_id *id) | |
1da177e4 | 430 | { |
82e9bae6 TI |
431 | struct snd_card *card = file->card; |
432 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
433 | int idx, ret; |
434 | ||
435 | down_write(&card->controls_rwsem); | |
436 | kctl = snd_ctl_find_id(card, id); | |
437 | if (kctl == NULL) { | |
317b8081 CL |
438 | ret = -ENOENT; |
439 | goto error; | |
1da177e4 | 440 | } |
18dd0aa5 CL |
441 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
442 | ret = -EINVAL; | |
443 | goto error; | |
444 | } | |
1da177e4 LT |
445 | for (idx = 0; idx < kctl->count; idx++) |
446 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
447 | ret = -EBUSY; |
448 | goto error; | |
1da177e4 LT |
449 | } |
450 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
451 | if (ret < 0) |
452 | goto error; | |
453 | card->user_ctl_count--; | |
317b8081 | 454 | error: |
1da177e4 LT |
455 | up_write(&card->controls_rwsem); |
456 | return ret; | |
457 | } | |
458 | ||
459 | /** | |
460 | * snd_ctl_rename_id - replace the id of a control on the card | |
461 | * @card: the card instance | |
462 | * @src_id: the old id | |
463 | * @dst_id: the new id | |
464 | * | |
465 | * Finds the control with the old id from the card, and replaces the | |
466 | * id with the new one. | |
467 | * | |
468 | * Returns zero if successful, or a negative error code on failure. | |
469 | */ | |
82e9bae6 TI |
470 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
471 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 472 | { |
82e9bae6 | 473 | struct snd_kcontrol *kctl; |
1da177e4 LT |
474 | |
475 | down_write(&card->controls_rwsem); | |
476 | kctl = snd_ctl_find_id(card, src_id); | |
477 | if (kctl == NULL) { | |
478 | up_write(&card->controls_rwsem); | |
479 | return -ENOENT; | |
480 | } | |
481 | kctl->id = *dst_id; | |
482 | kctl->id.numid = card->last_numid + 1; | |
483 | card->last_numid += kctl->count; | |
484 | up_write(&card->controls_rwsem); | |
485 | return 0; | |
486 | } | |
487 | ||
c0d3fb39 TI |
488 | EXPORT_SYMBOL(snd_ctl_rename_id); |
489 | ||
1da177e4 LT |
490 | /** |
491 | * snd_ctl_find_numid - find the control instance with the given number-id | |
492 | * @card: the card instance | |
493 | * @numid: the number-id to search | |
494 | * | |
495 | * Finds the control instance with the given number-id from the card. | |
496 | * | |
497 | * Returns the pointer of the instance if found, or NULL if not. | |
498 | * | |
499 | * The caller must down card->controls_rwsem before calling this function | |
500 | * (if the race condition can happen). | |
501 | */ | |
82e9bae6 | 502 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 503 | { |
82e9bae6 | 504 | struct snd_kcontrol *kctl; |
1da177e4 | 505 | |
7eaa943c TI |
506 | if (snd_BUG_ON(!card || !numid)) |
507 | return NULL; | |
9244b2c3 | 508 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
509 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
510 | return kctl; | |
511 | } | |
512 | return NULL; | |
513 | } | |
514 | ||
c0d3fb39 TI |
515 | EXPORT_SYMBOL(snd_ctl_find_numid); |
516 | ||
1da177e4 LT |
517 | /** |
518 | * snd_ctl_find_id - find the control instance with the given id | |
519 | * @card: the card instance | |
520 | * @id: the id to search | |
521 | * | |
522 | * Finds the control instance with the given id from the card. | |
523 | * | |
524 | * Returns the pointer of the instance if found, or NULL if not. | |
525 | * | |
526 | * The caller must down card->controls_rwsem before calling this function | |
527 | * (if the race condition can happen). | |
528 | */ | |
82e9bae6 TI |
529 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
530 | struct snd_ctl_elem_id *id) | |
1da177e4 | 531 | { |
82e9bae6 | 532 | struct snd_kcontrol *kctl; |
1da177e4 | 533 | |
7eaa943c TI |
534 | if (snd_BUG_ON(!card || !id)) |
535 | return NULL; | |
1da177e4 LT |
536 | if (id->numid != 0) |
537 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 538 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
539 | if (kctl->id.iface != id->iface) |
540 | continue; | |
541 | if (kctl->id.device != id->device) | |
542 | continue; | |
543 | if (kctl->id.subdevice != id->subdevice) | |
544 | continue; | |
545 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
546 | continue; | |
547 | if (kctl->id.index > id->index) | |
548 | continue; | |
549 | if (kctl->id.index + kctl->count <= id->index) | |
550 | continue; | |
551 | return kctl; | |
552 | } | |
553 | return NULL; | |
554 | } | |
555 | ||
c0d3fb39 TI |
556 | EXPORT_SYMBOL(snd_ctl_find_id); |
557 | ||
82e9bae6 | 558 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
559 | unsigned int cmd, void __user *arg) |
560 | { | |
82e9bae6 | 561 | struct snd_ctl_card_info *info; |
1da177e4 | 562 | |
ca2c0966 | 563 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
564 | if (! info) |
565 | return -ENOMEM; | |
566 | down_read(&snd_ioctl_rwsem); | |
567 | info->card = card->number; | |
568 | strlcpy(info->id, card->id, sizeof(info->id)); | |
569 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
570 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
571 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
572 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
573 | strlcpy(info->components, card->components, sizeof(info->components)); | |
574 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 575 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
576 | kfree(info); |
577 | return -EFAULT; | |
578 | } | |
579 | kfree(info); | |
580 | return 0; | |
581 | } | |
582 | ||
82e9bae6 TI |
583 | static int snd_ctl_elem_list(struct snd_card *card, |
584 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
585 | { |
586 | struct list_head *plist; | |
82e9bae6 TI |
587 | struct snd_ctl_elem_list list; |
588 | struct snd_kcontrol *kctl; | |
589 | struct snd_ctl_elem_id *dst, *id; | |
1da177e4 LT |
590 | unsigned int offset, space, first, jidx; |
591 | ||
592 | if (copy_from_user(&list, _list, sizeof(list))) | |
593 | return -EFAULT; | |
594 | offset = list.offset; | |
595 | space = list.space; | |
596 | first = 0; | |
597 | /* try limit maximum space */ | |
598 | if (space > 16384) | |
599 | return -ENOMEM; | |
600 | if (space > 0) { | |
601 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 602 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
603 | if (dst == NULL) |
604 | return -ENOMEM; | |
605 | down_read(&card->controls_rwsem); | |
606 | list.count = card->controls_count; | |
607 | plist = card->controls.next; | |
608 | while (plist != &card->controls) { | |
609 | if (offset == 0) | |
610 | break; | |
611 | kctl = snd_kcontrol(plist); | |
612 | if (offset < kctl->count) | |
613 | break; | |
614 | offset -= kctl->count; | |
615 | plist = plist->next; | |
616 | } | |
617 | list.used = 0; | |
618 | id = dst; | |
619 | while (space > 0 && plist != &card->controls) { | |
620 | kctl = snd_kcontrol(plist); | |
621 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
622 | snd_ctl_build_ioff(id, kctl, jidx); | |
623 | id++; | |
624 | space--; | |
625 | list.used++; | |
626 | } | |
627 | plist = plist->next; | |
628 | offset = 0; | |
629 | } | |
630 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
631 | if (list.used > 0 && |
632 | copy_to_user(list.pids, dst, | |
633 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
634 | vfree(dst); |
635 | return -EFAULT; | |
636 | } | |
637 | vfree(dst); | |
638 | } else { | |
639 | down_read(&card->controls_rwsem); | |
640 | list.count = card->controls_count; | |
641 | up_read(&card->controls_rwsem); | |
642 | } | |
643 | if (copy_to_user(_list, &list, sizeof(list))) | |
644 | return -EFAULT; | |
645 | return 0; | |
646 | } | |
647 | ||
82e9bae6 TI |
648 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
649 | struct snd_ctl_elem_info *info) | |
1da177e4 | 650 | { |
82e9bae6 TI |
651 | struct snd_card *card = ctl->card; |
652 | struct snd_kcontrol *kctl; | |
653 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
654 | unsigned int index_offset; |
655 | int result; | |
656 | ||
657 | down_read(&card->controls_rwsem); | |
658 | kctl = snd_ctl_find_id(card, &info->id); | |
659 | if (kctl == NULL) { | |
660 | up_read(&card->controls_rwsem); | |
661 | return -ENOENT; | |
662 | } | |
663 | #ifdef CONFIG_SND_DEBUG | |
664 | info->access = 0; | |
665 | #endif | |
666 | result = kctl->info(kctl, info); | |
667 | if (result >= 0) { | |
7eaa943c | 668 | snd_BUG_ON(info->access); |
1da177e4 LT |
669 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
670 | vd = &kctl->vd[index_offset]; | |
671 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
672 | info->access = vd->access; | |
673 | if (vd->owner) { | |
674 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
675 | if (vd->owner == ctl) | |
676 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 677 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
678 | } else { |
679 | info->owner = -1; | |
680 | } | |
681 | } | |
682 | up_read(&card->controls_rwsem); | |
683 | return result; | |
684 | } | |
685 | ||
82e9bae6 TI |
686 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
687 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 688 | { |
82e9bae6 | 689 | struct snd_ctl_elem_info info; |
1da177e4 LT |
690 | int result; |
691 | ||
692 | if (copy_from_user(&info, _info, sizeof(info))) | |
693 | return -EFAULT; | |
64649400 | 694 | snd_power_lock(ctl->card); |
cbac4b0c | 695 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
696 | if (result >= 0) |
697 | result = snd_ctl_elem_info(ctl, &info); | |
698 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
699 | if (result >= 0) |
700 | if (copy_to_user(_info, &info, sizeof(info))) | |
701 | return -EFAULT; | |
702 | return result; | |
703 | } | |
704 | ||
d3bd67cd TI |
705 | static int snd_ctl_elem_read(struct snd_card *card, |
706 | struct snd_ctl_elem_value *control) | |
1da177e4 | 707 | { |
82e9bae6 TI |
708 | struct snd_kcontrol *kctl; |
709 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 710 | unsigned int index_offset; |
8ace4f3c | 711 | int result; |
1da177e4 LT |
712 | |
713 | down_read(&card->controls_rwsem); | |
714 | kctl = snd_ctl_find_id(card, &control->id); | |
715 | if (kctl == NULL) { | |
716 | result = -ENOENT; | |
717 | } else { | |
718 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
719 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
720 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
721 | kctl->get != NULL) { | |
722 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
723 | result = kctl->get(kctl, control); | |
724 | } else | |
725 | result = -EPERM; | |
1da177e4 LT |
726 | } |
727 | up_read(&card->controls_rwsem); | |
728 | return result; | |
729 | } | |
730 | ||
82e9bae6 TI |
731 | static int snd_ctl_elem_read_user(struct snd_card *card, |
732 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 733 | { |
82e9bae6 | 734 | struct snd_ctl_elem_value *control; |
1da177e4 | 735 | int result; |
ef44a1ec LZ |
736 | |
737 | control = memdup_user(_control, sizeof(*control)); | |
738 | if (IS_ERR(control)) | |
739 | return PTR_ERR(control); | |
740 | ||
64649400 | 741 | snd_power_lock(card); |
cbac4b0c | 742 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
743 | if (result >= 0) |
744 | result = snd_ctl_elem_read(card, control); | |
745 | snd_power_unlock(card); | |
1da177e4 LT |
746 | if (result >= 0) |
747 | if (copy_to_user(_control, control, sizeof(*control))) | |
748 | result = -EFAULT; | |
749 | kfree(control); | |
750 | return result; | |
751 | } | |
752 | ||
d3bd67cd TI |
753 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
754 | struct snd_ctl_elem_value *control) | |
1da177e4 | 755 | { |
82e9bae6 TI |
756 | struct snd_kcontrol *kctl; |
757 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 758 | unsigned int index_offset; |
8ace4f3c | 759 | int result; |
1da177e4 LT |
760 | |
761 | down_read(&card->controls_rwsem); | |
762 | kctl = snd_ctl_find_id(card, &control->id); | |
763 | if (kctl == NULL) { | |
764 | result = -ENOENT; | |
765 | } else { | |
766 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
767 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
768 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
769 | kctl->put == NULL || | |
770 | (file && vd->owner && vd->owner != file)) { | |
771 | result = -EPERM; | |
1da177e4 | 772 | } else { |
8ace4f3c TI |
773 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
774 | result = kctl->put(kctl, control); | |
775 | } | |
776 | if (result > 0) { | |
777 | up_read(&card->controls_rwsem); | |
778 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
779 | &control->id); | |
780 | return 0; | |
1da177e4 LT |
781 | } |
782 | } | |
783 | up_read(&card->controls_rwsem); | |
784 | return result; | |
785 | } | |
786 | ||
82e9bae6 TI |
787 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
788 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 789 | { |
82e9bae6 | 790 | struct snd_ctl_elem_value *control; |
64649400 | 791 | struct snd_card *card; |
1da177e4 LT |
792 | int result; |
793 | ||
ef44a1ec LZ |
794 | control = memdup_user(_control, sizeof(*control)); |
795 | if (IS_ERR(control)) | |
796 | return PTR_ERR(control); | |
797 | ||
64649400 GP |
798 | card = file->card; |
799 | snd_power_lock(card); | |
cbac4b0c | 800 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
801 | if (result >= 0) |
802 | result = snd_ctl_elem_write(card, file, control); | |
803 | snd_power_unlock(card); | |
1da177e4 LT |
804 | if (result >= 0) |
805 | if (copy_to_user(_control, control, sizeof(*control))) | |
806 | result = -EFAULT; | |
807 | kfree(control); | |
808 | return result; | |
809 | } | |
810 | ||
82e9bae6 TI |
811 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
812 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 813 | { |
82e9bae6 TI |
814 | struct snd_card *card = file->card; |
815 | struct snd_ctl_elem_id id; | |
816 | struct snd_kcontrol *kctl; | |
817 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
818 | int result; |
819 | ||
820 | if (copy_from_user(&id, _id, sizeof(id))) | |
821 | return -EFAULT; | |
822 | down_write(&card->controls_rwsem); | |
823 | kctl = snd_ctl_find_id(card, &id); | |
824 | if (kctl == NULL) { | |
825 | result = -ENOENT; | |
826 | } else { | |
827 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
828 | if (vd->owner != NULL) | |
829 | result = -EBUSY; | |
830 | else { | |
831 | vd->owner = file; | |
1da177e4 LT |
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; | |
1da177e4 LT |
862 | result = 0; |
863 | } | |
864 | } | |
865 | up_write(&card->controls_rwsem); | |
866 | return result; | |
867 | } | |
868 | ||
869 | struct user_element { | |
82e9bae6 | 870 | struct snd_ctl_elem_info info; |
1da177e4 LT |
871 | void *elem_data; /* element data */ |
872 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
873 | void *tlv_data; /* TLV data */ |
874 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 LT |
875 | void *priv_data; /* private data (like strings for enumerated type) */ |
876 | unsigned long priv_data_size; /* size of private data in bytes */ | |
877 | }; | |
878 | ||
82e9bae6 TI |
879 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
880 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
881 | { |
882 | struct user_element *ue = kcontrol->private_data; | |
883 | ||
884 | *uinfo = ue->info; | |
885 | return 0; | |
886 | } | |
887 | ||
82e9bae6 TI |
888 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
889 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
890 | { |
891 | struct user_element *ue = kcontrol->private_data; | |
892 | ||
893 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
894 | return 0; | |
895 | } | |
896 | ||
82e9bae6 TI |
897 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
898 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
899 | { |
900 | int change; | |
901 | struct user_element *ue = kcontrol->private_data; | |
902 | ||
903 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
904 | if (change) | |
905 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
906 | return change; | |
907 | } | |
908 | ||
8aa9b586 JK |
909 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
910 | int op_flag, | |
911 | unsigned int size, | |
912 | unsigned int __user *tlv) | |
913 | { | |
914 | struct user_element *ue = kcontrol->private_data; | |
915 | int change = 0; | |
916 | void *new_data; | |
917 | ||
918 | if (op_flag > 0) { | |
919 | if (size > 1024 * 128) /* sane value */ | |
920 | return -EINVAL; | |
ef44a1ec LZ |
921 | |
922 | new_data = memdup_user(tlv, size); | |
923 | if (IS_ERR(new_data)) | |
924 | return PTR_ERR(new_data); | |
8aa9b586 JK |
925 | change = ue->tlv_data_size != size; |
926 | if (!change) | |
927 | change = memcmp(ue->tlv_data, new_data, size); | |
928 | kfree(ue->tlv_data); | |
929 | ue->tlv_data = new_data; | |
930 | ue->tlv_data_size = size; | |
931 | } else { | |
18c1c3f6 TI |
932 | if (! ue->tlv_data_size || ! ue->tlv_data) |
933 | return -ENXIO; | |
8aa9b586 JK |
934 | if (size < ue->tlv_data_size) |
935 | return -ENOSPC; | |
936 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) | |
937 | return -EFAULT; | |
938 | } | |
939 | return change; | |
940 | } | |
941 | ||
82e9bae6 | 942 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 943 | { |
8aa9b586 JK |
944 | struct user_element *ue = kcontrol->private_data; |
945 | if (ue->tlv_data) | |
946 | kfree(ue->tlv_data); | |
947 | kfree(ue); | |
1da177e4 LT |
948 | } |
949 | ||
82e9bae6 TI |
950 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
951 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 952 | { |
82e9bae6 TI |
953 | struct snd_card *card = file->card; |
954 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
955 | unsigned int access; |
956 | long private_size; | |
957 | struct user_element *ue; | |
958 | int idx, err; | |
959 | ||
960 | if (card->user_ctl_count >= MAX_USER_CONTROLS) | |
961 | return -ENOMEM; | |
2a031aed | 962 | if (info->count < 1) |
1da177e4 LT |
963 | return -EINVAL; |
964 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 965 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
966 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
967 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
968 | info->id.numid = 0; |
969 | memset(&kctl, 0, sizeof(kctl)); | |
970 | down_write(&card->controls_rwsem); | |
971 | _kctl = snd_ctl_find_id(card, &info->id); | |
972 | err = 0; | |
973 | if (_kctl) { | |
974 | if (replace) | |
975 | err = snd_ctl_remove(card, _kctl); | |
976 | else | |
977 | err = -EBUSY; | |
978 | } else { | |
979 | if (replace) | |
980 | err = -ENOENT; | |
981 | } | |
982 | up_write(&card->controls_rwsem); | |
983 | if (err < 0) | |
984 | return err; | |
985 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
986 | kctl.count = info->owner ? info->owner : 1; | |
987 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
988 | kctl.info = snd_ctl_elem_user_info; | |
989 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
990 | kctl.get = snd_ctl_elem_user_get; | |
991 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
992 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
993 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
994 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
995 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
996 | } | |
1da177e4 LT |
997 | switch (info->type) { |
998 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
999 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1000 | private_size = sizeof(long); | |
1001 | if (info->count > 128) | |
1002 | return -EINVAL; | |
1003 | break; | |
1004 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
1005 | private_size = sizeof(long long); | |
1006 | if (info->count > 64) | |
1007 | return -EINVAL; | |
1008 | break; | |
1009 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
1010 | private_size = sizeof(unsigned char); | |
1011 | if (info->count > 512) | |
1012 | return -EINVAL; | |
1013 | break; | |
1014 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1015 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1016 | if (info->count != 1) |
1017 | return -EINVAL; | |
1018 | break; | |
1019 | default: | |
1020 | return -EINVAL; | |
1021 | } | |
1022 | private_size *= info->count; | |
ca2c0966 | 1023 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1024 | if (ue == NULL) |
1025 | return -ENOMEM; | |
1026 | ue->info = *info; | |
86148e84 | 1027 | ue->info.access = 0; |
1da177e4 LT |
1028 | ue->elem_data = (char *)ue + sizeof(*ue); |
1029 | ue->elem_data_size = private_size; | |
1030 | kctl.private_free = snd_ctl_elem_user_free; | |
1031 | _kctl = snd_ctl_new(&kctl, access); | |
1032 | if (_kctl == NULL) { | |
2fbf182e | 1033 | kfree(ue); |
1da177e4 LT |
1034 | return -ENOMEM; |
1035 | } | |
1036 | _kctl->private_data = ue; | |
1037 | for (idx = 0; idx < _kctl->count; idx++) | |
1038 | _kctl->vd[idx].owner = file; | |
1039 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1040 | if (err < 0) |
1da177e4 | 1041 | return err; |
1da177e4 LT |
1042 | |
1043 | down_write(&card->controls_rwsem); | |
1044 | card->user_ctl_count++; | |
1045 | up_write(&card->controls_rwsem); | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
82e9bae6 TI |
1050 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1051 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1052 | { |
82e9bae6 | 1053 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1054 | if (copy_from_user(&info, _info, sizeof(info))) |
1055 | return -EFAULT; | |
1056 | return snd_ctl_elem_add(file, &info, replace); | |
1057 | } | |
1058 | ||
82e9bae6 TI |
1059 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1060 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1061 | { |
82e9bae6 | 1062 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1063 | |
1064 | if (copy_from_user(&id, _id, sizeof(id))) | |
1065 | return -EFAULT; | |
f217ac59 | 1066 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1067 | } |
1068 | ||
82e9bae6 | 1069 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1070 | { |
1071 | int subscribe; | |
1072 | if (get_user(subscribe, ptr)) | |
1073 | return -EFAULT; | |
1074 | if (subscribe < 0) { | |
1075 | subscribe = file->subscribed; | |
1076 | if (put_user(subscribe, ptr)) | |
1077 | return -EFAULT; | |
1078 | return 0; | |
1079 | } | |
1080 | if (subscribe) { | |
1081 | file->subscribed = 1; | |
1082 | return 0; | |
1083 | } else if (file->subscribed) { | |
1084 | snd_ctl_empty_read_queue(file); | |
1085 | file->subscribed = 0; | |
1086 | } | |
1087 | return 0; | |
1088 | } | |
1089 | ||
8aa9b586 JK |
1090 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1091 | struct snd_ctl_tlv __user *_tlv, | |
1092 | int op_flag) | |
42750b04 | 1093 | { |
8aa9b586 | 1094 | struct snd_card *card = file->card; |
42750b04 JK |
1095 | struct snd_ctl_tlv tlv; |
1096 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1097 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1098 | unsigned int len; |
1099 | int err = 0; | |
1100 | ||
1101 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1102 | return -EFAULT; | |
6123637f | 1103 | if (tlv.length < sizeof(unsigned int) * 2) |
8aa9b586 JK |
1104 | return -EINVAL; |
1105 | down_read(&card->controls_rwsem); | |
1106 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1107 | if (kctl == NULL) { | |
1108 | err = -ENOENT; | |
1109 | goto __kctl_end; | |
1110 | } | |
1111 | if (kctl->tlv.p == NULL) { | |
1112 | err = -ENXIO; | |
1113 | goto __kctl_end; | |
1114 | } | |
1115 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1116 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1117 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1118 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1119 | err = -ENXIO; | |
1120 | goto __kctl_end; | |
1121 | } | |
1122 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
bec145ae | 1123 | if (vd->owner != NULL && vd->owner != file) { |
8aa9b586 JK |
1124 | err = -EPERM; |
1125 | goto __kctl_end; | |
1126 | } | |
1127 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); | |
1128 | if (err > 0) { | |
1129 | up_read(&card->controls_rwsem); | |
1130 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1131 | return 0; | |
1132 | } | |
1133 | } else { | |
1134 | if (op_flag) { | |
1135 | err = -ENXIO; | |
1136 | goto __kctl_end; | |
1137 | } | |
1138 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1139 | if (tlv.length < len) { | |
1140 | err = -ENOMEM; | |
1141 | goto __kctl_end; | |
1142 | } | |
1143 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1144 | err = -EFAULT; | |
1145 | } | |
42750b04 | 1146 | __kctl_end: |
8aa9b586 JK |
1147 | up_read(&card->controls_rwsem); |
1148 | return err; | |
42750b04 JK |
1149 | } |
1150 | ||
1da177e4 LT |
1151 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1152 | { | |
82e9bae6 TI |
1153 | struct snd_ctl_file *ctl; |
1154 | struct snd_card *card; | |
82e9bae6 | 1155 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1156 | void __user *argp = (void __user *)arg; |
1157 | int __user *ip = argp; | |
1158 | int err; | |
1159 | ||
1160 | ctl = file->private_data; | |
1161 | card = ctl->card; | |
7eaa943c TI |
1162 | if (snd_BUG_ON(!card)) |
1163 | return -ENXIO; | |
1da177e4 LT |
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; | |
7eaa943c TI |
1225 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1226 | return -ENXIO; | |
1da177e4 LT |
1227 | if (!ctl->subscribed) |
1228 | return -EBADFD; | |
82e9bae6 | 1229 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1230 | return -EINVAL; |
1231 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1232 | while (count >= sizeof(struct snd_ctl_event)) { |
1233 | struct snd_ctl_event ev; | |
1234 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1235 | while (list_empty(&ctl->events)) { |
1236 | wait_queue_t wait; | |
1237 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1238 | err = -EAGAIN; | |
1239 | goto __end_lock; | |
1240 | } | |
1241 | init_waitqueue_entry(&wait, current); | |
1242 | add_wait_queue(&ctl->change_sleep, &wait); | |
1243 | set_current_state(TASK_INTERRUPTIBLE); | |
1244 | spin_unlock_irq(&ctl->read_lock); | |
1245 | schedule(); | |
1246 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1247 | if (signal_pending(current)) | |
0e5d720c | 1248 | return -ERESTARTSYS; |
1da177e4 LT |
1249 | spin_lock_irq(&ctl->read_lock); |
1250 | } | |
1251 | kev = snd_kctl_event(ctl->events.next); | |
1252 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1253 | ev.data.elem.mask = kev->mask; | |
1254 | ev.data.elem.id = kev->id; | |
1255 | list_del(&kev->list); | |
1256 | spin_unlock_irq(&ctl->read_lock); | |
1257 | kfree(kev); | |
82e9bae6 | 1258 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1259 | err = -EFAULT; |
1260 | goto __end; | |
1261 | } | |
1262 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1263 | buffer += sizeof(struct snd_ctl_event); |
1264 | count -= sizeof(struct snd_ctl_event); | |
1265 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1266 | } |
1267 | __end_lock: | |
1268 | spin_unlock_irq(&ctl->read_lock); | |
1269 | __end: | |
1270 | return result > 0 ? result : err; | |
1271 | } | |
1272 | ||
1273 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1274 | { | |
1275 | unsigned int mask; | |
82e9bae6 | 1276 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1277 | |
1278 | ctl = file->private_data; | |
1279 | if (!ctl->subscribed) | |
1280 | return 0; | |
1281 | poll_wait(file, &ctl->change_sleep, wait); | |
1282 | ||
1283 | mask = 0; | |
1284 | if (!list_empty(&ctl->events)) | |
1285 | mask |= POLLIN | POLLRDNORM; | |
1286 | ||
1287 | return mask; | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * register the device-specific control-ioctls. | |
1292 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1293 | */ | |
1294 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1295 | { | |
82e9bae6 | 1296 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1297 | |
82e9bae6 | 1298 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1299 | if (pn == NULL) |
1300 | return -ENOMEM; | |
1301 | pn->fioctl = fcn; | |
1302 | down_write(&snd_ioctl_rwsem); | |
1303 | list_add_tail(&pn->list, lists); | |
1304 | up_write(&snd_ioctl_rwsem); | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1309 | { | |
1310 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1311 | } | |
1312 | ||
c0d3fb39 TI |
1313 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1314 | ||
1da177e4 LT |
1315 | #ifdef CONFIG_COMPAT |
1316 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1317 | { | |
1318 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1319 | } | |
c0d3fb39 TI |
1320 | |
1321 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1322 | #endif |
1323 | ||
1324 | /* | |
1325 | * de-register the device-specific control-ioctls. | |
1326 | */ | |
82e9bae6 TI |
1327 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1328 | struct list_head *lists) | |
1da177e4 | 1329 | { |
82e9bae6 | 1330 | struct snd_kctl_ioctl *p; |
1da177e4 | 1331 | |
7eaa943c TI |
1332 | if (snd_BUG_ON(!fcn)) |
1333 | return -EINVAL; | |
1da177e4 | 1334 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1335 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1336 | if (p->fioctl == fcn) { |
1337 | list_del(&p->list); | |
1338 | up_write(&snd_ioctl_rwsem); | |
1339 | kfree(p); | |
1340 | return 0; | |
1341 | } | |
1342 | } | |
1343 | up_write(&snd_ioctl_rwsem); | |
1344 | snd_BUG(); | |
1345 | return -EINVAL; | |
1346 | } | |
1347 | ||
1348 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1349 | { | |
1350 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1351 | } | |
1352 | ||
c0d3fb39 TI |
1353 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1354 | ||
1da177e4 LT |
1355 | #ifdef CONFIG_COMPAT |
1356 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1357 | { | |
1358 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1359 | } | |
1360 | ||
c0d3fb39 | 1361 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1362 | #endif |
1363 | ||
1364 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1365 | { | |
82e9bae6 | 1366 | struct snd_ctl_file *ctl; |
60aa4924 | 1367 | |
1da177e4 | 1368 | ctl = file->private_data; |
60aa4924 | 1369 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | /* | |
1373 | * ioctl32 compat | |
1374 | */ | |
1375 | #ifdef CONFIG_COMPAT | |
1376 | #include "control_compat.c" | |
1377 | #else | |
1378 | #define snd_ctl_ioctl_compat NULL | |
1379 | #endif | |
1380 | ||
1381 | /* | |
1382 | * INIT PART | |
1383 | */ | |
1384 | ||
9c2e08c5 | 1385 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1386 | { |
1387 | .owner = THIS_MODULE, | |
1388 | .read = snd_ctl_read, | |
1389 | .open = snd_ctl_open, | |
1390 | .release = snd_ctl_release, | |
1391 | .poll = snd_ctl_poll, | |
1392 | .unlocked_ioctl = snd_ctl_ioctl, | |
1393 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1394 | .fasync = snd_ctl_fasync, | |
1395 | }; | |
1396 | ||
1da177e4 LT |
1397 | /* |
1398 | * registration of the control device | |
1399 | */ | |
82e9bae6 | 1400 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1401 | { |
82e9bae6 | 1402 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1403 | int err, cardnum; |
1404 | char name[16]; | |
1405 | ||
7eaa943c TI |
1406 | if (snd_BUG_ON(!card)) |
1407 | return -ENXIO; | |
1da177e4 | 1408 | cardnum = card->number; |
7eaa943c TI |
1409 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1410 | return -ENXIO; | |
1da177e4 | 1411 | sprintf(name, "controlC%i", cardnum); |
f87135f5 CL |
1412 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1413 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1414 | return err; |
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * disconnection of the control device | |
1420 | */ | |
82e9bae6 | 1421 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1422 | { |
82e9bae6 | 1423 | struct snd_card *card = device->device_data; |
82e9bae6 | 1424 | struct snd_ctl_file *ctl; |
c461482c TI |
1425 | int err, cardnum; |
1426 | ||
7eaa943c TI |
1427 | if (snd_BUG_ON(!card)) |
1428 | return -ENXIO; | |
c461482c | 1429 | cardnum = card->number; |
7eaa943c TI |
1430 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1431 | return -ENXIO; | |
1da177e4 | 1432 | |
d8009882 | 1433 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1434 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1435 | wake_up(&ctl->change_sleep); |
1436 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1437 | } | |
d8009882 | 1438 | read_unlock(&card->ctl_files_rwlock); |
c461482c TI |
1439 | |
1440 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1441 | card, -1)) < 0) | |
1442 | return err; | |
1da177e4 LT |
1443 | return 0; |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * free all controls | |
1448 | */ | |
82e9bae6 | 1449 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1450 | { |
82e9bae6 TI |
1451 | struct snd_card *card = device->device_data; |
1452 | struct snd_kcontrol *control; | |
1da177e4 LT |
1453 | |
1454 | down_write(&card->controls_rwsem); | |
1455 | while (!list_empty(&card->controls)) { | |
1456 | control = snd_kcontrol(card->controls.next); | |
1457 | snd_ctl_remove(card, control); | |
1458 | } | |
1459 | up_write(&card->controls_rwsem); | |
1460 | return 0; | |
1461 | } | |
1462 | ||
1da177e4 LT |
1463 | /* |
1464 | * create control core: | |
1465 | * called from init.c | |
1466 | */ | |
82e9bae6 | 1467 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1468 | { |
82e9bae6 | 1469 | static struct snd_device_ops ops = { |
1da177e4 LT |
1470 | .dev_free = snd_ctl_dev_free, |
1471 | .dev_register = snd_ctl_dev_register, | |
1472 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1473 | }; |
1474 | ||
7eaa943c TI |
1475 | if (snd_BUG_ON(!card)) |
1476 | return -ENXIO; | |
1da177e4 LT |
1477 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); |
1478 | } | |
b9ed4f2b TI |
1479 | |
1480 | /* | |
1481 | * Frequently used control callbacks | |
1482 | */ | |
1483 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
1484 | struct snd_ctl_elem_info *uinfo) | |
1485 | { | |
1486 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1487 | uinfo->count = 1; | |
1488 | uinfo->value.integer.min = 0; | |
1489 | uinfo->value.integer.max = 1; | |
1490 | return 0; | |
1491 | } | |
1492 | ||
1493 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); | |
1494 | ||
1495 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
1496 | struct snd_ctl_elem_info *uinfo) | |
1497 | { | |
1498 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1499 | uinfo->count = 2; | |
1500 | uinfo->value.integer.min = 0; | |
1501 | uinfo->value.integer.max = 1; | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |