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Commit | Line | Data |
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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 | ||
02f4865f TI |
53 | err = nonseekable_open(inode, file); |
54 | if (err < 0) | |
55 | return err; | |
56 | ||
f87135f5 | 57 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
58 | if (!card) { |
59 | err = -ENODEV; | |
60 | goto __error1; | |
61 | } | |
62 | err = snd_card_file_add(card, file); | |
63 | if (err < 0) { | |
64 | err = -ENODEV; | |
65 | goto __error1; | |
66 | } | |
67 | if (!try_module_get(card->module)) { | |
68 | err = -EFAULT; | |
69 | goto __error2; | |
70 | } | |
ca2c0966 | 71 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
72 | if (ctl == NULL) { |
73 | err = -ENOMEM; | |
74 | goto __error; | |
75 | } | |
76 | INIT_LIST_HEAD(&ctl->events); | |
77 | init_waitqueue_head(&ctl->change_sleep); | |
78 | spin_lock_init(&ctl->read_lock); | |
79 | ctl->card = card; | |
2529bba7 TI |
80 | ctl->prefer_pcm_subdevice = -1; |
81 | ctl->prefer_rawmidi_subdevice = -1; | |
25d27ede | 82 | ctl->pid = get_pid(task_pid(current)); |
1da177e4 LT |
83 | file->private_data = ctl; |
84 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
85 | list_add_tail(&ctl->list, &card->ctl_files); | |
86 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
87 | return 0; | |
88 | ||
89 | __error: | |
90 | module_put(card->module); | |
91 | __error2: | |
92 | snd_card_file_remove(card, file); | |
93 | __error1: | |
94 | return err; | |
95 | } | |
96 | ||
82e9bae6 | 97 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 98 | { |
7507e8da | 99 | unsigned long flags; |
82e9bae6 | 100 | struct snd_kctl_event *cread; |
1da177e4 | 101 | |
7507e8da | 102 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
103 | while (!list_empty(&ctl->events)) { |
104 | cread = snd_kctl_event(ctl->events.next); | |
105 | list_del(&cread->list); | |
106 | kfree(cread); | |
107 | } | |
7507e8da | 108 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
109 | } |
110 | ||
111 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
112 | { | |
113 | unsigned long flags; | |
82e9bae6 TI |
114 | struct snd_card *card; |
115 | struct snd_ctl_file *ctl; | |
116 | struct snd_kcontrol *control; | |
1da177e4 LT |
117 | unsigned int idx; |
118 | ||
119 | ctl = file->private_data; | |
1da177e4 LT |
120 | file->private_data = NULL; |
121 | card = ctl->card; | |
122 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
123 | list_del(&ctl->list); | |
124 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
125 | down_write(&card->controls_rwsem); | |
9244b2c3 | 126 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
127 | for (idx = 0; idx < control->count; idx++) |
128 | if (control->vd[idx].owner == ctl) | |
129 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
130 | up_write(&card->controls_rwsem); |
131 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 132 | put_pid(ctl->pid); |
1da177e4 LT |
133 | kfree(ctl); |
134 | module_put(card->module); | |
135 | snd_card_file_remove(card, file); | |
136 | return 0; | |
137 | } | |
138 | ||
82e9bae6 TI |
139 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
140 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
141 | { |
142 | unsigned long flags; | |
82e9bae6 TI |
143 | struct snd_ctl_file *ctl; |
144 | struct snd_kctl_event *ev; | |
1da177e4 | 145 | |
7eaa943c TI |
146 | if (snd_BUG_ON(!card || !id)) |
147 | return; | |
1da177e4 LT |
148 | read_lock(&card->ctl_files_rwlock); |
149 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
150 | card->mixer_oss_change_count++; | |
151 | #endif | |
9244b2c3 | 152 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
153 | if (!ctl->subscribed) |
154 | continue; | |
155 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 156 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
157 | if (ev->id.numid == id->numid) { |
158 | ev->mask |= mask; | |
159 | goto _found; | |
160 | } | |
161 | } | |
ca2c0966 | 162 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
163 | if (ev) { |
164 | ev->id = *id; | |
165 | ev->mask = mask; | |
166 | list_add_tail(&ev->list, &ctl->events); | |
167 | } else { | |
168 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
169 | } | |
170 | _found: | |
171 | wake_up(&ctl->change_sleep); | |
172 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
173 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
174 | } | |
175 | read_unlock(&card->ctl_files_rwlock); | |
176 | } | |
177 | ||
c0d3fb39 TI |
178 | EXPORT_SYMBOL(snd_ctl_notify); |
179 | ||
1da177e4 LT |
180 | /** |
181 | * snd_ctl_new - create a control instance from the template | |
182 | * @control: the control template | |
183 | * @access: the default control access | |
184 | * | |
82e9bae6 | 185 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
186 | * to the new instance. It does not copy volatile data (access). |
187 | * | |
188 | * Returns the pointer of the new instance, or NULL on failure. | |
189 | */ | |
0b51ba07 AB |
190 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
191 | unsigned int access) | |
1da177e4 | 192 | { |
82e9bae6 | 193 | struct snd_kcontrol *kctl; |
1da177e4 LT |
194 | unsigned int idx; |
195 | ||
7eaa943c TI |
196 | if (snd_BUG_ON(!control || !control->count)) |
197 | return NULL; | |
82e9bae6 | 198 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 TI |
199 | if (kctl == NULL) { |
200 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); | |
1da177e4 | 201 | return NULL; |
73e77ba0 | 202 | } |
1da177e4 LT |
203 | *kctl = *control; |
204 | for (idx = 0; idx < kctl->count; idx++) | |
205 | kctl->vd[idx].access = access; | |
206 | return kctl; | |
207 | } | |
208 | ||
209 | /** | |
210 | * snd_ctl_new1 - create a control instance from the template | |
211 | * @ncontrol: the initialization record | |
212 | * @private_data: the private data to set | |
213 | * | |
82e9bae6 | 214 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
215 | * template. When the access field of ncontrol is 0, it's assumed as |
216 | * READWRITE access. When the count field is 0, it's assumes as one. | |
217 | * | |
218 | * Returns the pointer of the newly generated instance, or NULL on failure. | |
219 | */ | |
82e9bae6 TI |
220 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
221 | void *private_data) | |
1da177e4 | 222 | { |
82e9bae6 | 223 | struct snd_kcontrol kctl; |
1da177e4 LT |
224 | unsigned int access; |
225 | ||
7eaa943c TI |
226 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
227 | return NULL; | |
1da177e4 LT |
228 | memset(&kctl, 0, sizeof(kctl)); |
229 | kctl.id.iface = ncontrol->iface; | |
230 | kctl.id.device = ncontrol->device; | |
231 | kctl.id.subdevice = ncontrol->subdevice; | |
366840d7 | 232 | if (ncontrol->name) { |
1da177e4 | 233 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
366840d7 MB |
234 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
235 | snd_printk(KERN_WARNING | |
236 | "Control name '%s' truncated to '%s'\n", | |
237 | ncontrol->name, kctl.id.name); | |
238 | } | |
1da177e4 LT |
239 | kctl.id.index = ncontrol->index; |
240 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
241 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 JK |
242 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
243 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| | |
a75d7a4c CL |
244 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
245 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| | |
246 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
247 | kctl.info = ncontrol->info; |
248 | kctl.get = ncontrol->get; | |
249 | kctl.put = ncontrol->put; | |
8aa9b586 | 250 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
251 | kctl.private_value = ncontrol->private_value; |
252 | kctl.private_data = private_data; | |
253 | return snd_ctl_new(&kctl, access); | |
254 | } | |
255 | ||
c0d3fb39 TI |
256 | EXPORT_SYMBOL(snd_ctl_new1); |
257 | ||
1da177e4 LT |
258 | /** |
259 | * snd_ctl_free_one - release the control instance | |
260 | * @kcontrol: the control instance | |
261 | * | |
262 | * Releases the control instance created via snd_ctl_new() | |
263 | * or snd_ctl_new1(). | |
264 | * Don't call this after the control was added to the card. | |
265 | */ | |
82e9bae6 | 266 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
267 | { |
268 | if (kcontrol) { | |
269 | if (kcontrol->private_free) | |
270 | kcontrol->private_free(kcontrol); | |
271 | kfree(kcontrol); | |
272 | } | |
273 | } | |
274 | ||
c0d3fb39 TI |
275 | EXPORT_SYMBOL(snd_ctl_free_one); |
276 | ||
82e9bae6 | 277 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
1da177e4 LT |
278 | unsigned int count) |
279 | { | |
82e9bae6 | 280 | struct snd_kcontrol *kctl; |
1da177e4 | 281 | |
9244b2c3 | 282 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
283 | if ((kctl->id.numid <= card->last_numid && |
284 | kctl->id.numid + kctl->count > card->last_numid) || | |
285 | (kctl->id.numid <= card->last_numid + count - 1 && | |
286 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) | |
287 | return card->last_numid = kctl->id.numid + kctl->count - 1; | |
288 | } | |
289 | return card->last_numid; | |
290 | } | |
291 | ||
82e9bae6 | 292 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 LT |
293 | { |
294 | unsigned int last_numid, iter = 100000; | |
295 | ||
296 | last_numid = card->last_numid; | |
297 | while (last_numid != snd_ctl_hole_check(card, count)) { | |
298 | if (--iter == 0) { | |
299 | /* this situation is very unlikely */ | |
300 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
301 | return -ENOMEM; | |
302 | } | |
303 | last_numid = card->last_numid; | |
304 | } | |
305 | return 0; | |
306 | } | |
307 | ||
308 | /** | |
309 | * snd_ctl_add - add the control instance to the card | |
310 | * @card: the card instance | |
311 | * @kcontrol: the control instance to add | |
312 | * | |
313 | * Adds the control instance created via snd_ctl_new() or | |
314 | * snd_ctl_new1() to the given card. Assigns also an unique | |
315 | * numid used for fast search. | |
316 | * | |
317 | * Returns zero if successful, or a negative error code on failure. | |
318 | * | |
319 | * It frees automatically the control which cannot be added. | |
320 | */ | |
82e9bae6 | 321 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 322 | { |
82e9bae6 | 323 | struct snd_ctl_elem_id id; |
1da177e4 | 324 | unsigned int idx; |
c6077b30 | 325 | int err = -EINVAL; |
1da177e4 | 326 | |
73e77ba0 | 327 | if (! kcontrol) |
c6077b30 | 328 | return err; |
7eaa943c TI |
329 | if (snd_BUG_ON(!card || !kcontrol->info)) |
330 | goto error; | |
1da177e4 LT |
331 | id = kcontrol->id; |
332 | down_write(&card->controls_rwsem); | |
333 | if (snd_ctl_find_id(card, &id)) { | |
334 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
335 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
336 | id.iface, | |
337 | id.device, | |
338 | id.subdevice, | |
339 | id.name, | |
340 | id.index); | |
c6077b30 TI |
341 | err = -EBUSY; |
342 | goto error; | |
1da177e4 LT |
343 | } |
344 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
345 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
346 | err = -ENOMEM; |
347 | goto error; | |
1da177e4 LT |
348 | } |
349 | list_add_tail(&kcontrol->list, &card->controls); | |
350 | card->controls_count += kcontrol->count; | |
351 | kcontrol->id.numid = card->last_numid + 1; | |
352 | card->last_numid += kcontrol->count; | |
353 | up_write(&card->controls_rwsem); | |
354 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
355 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
356 | return 0; | |
c6077b30 TI |
357 | |
358 | error: | |
359 | snd_ctl_free_one(kcontrol); | |
360 | return err; | |
1da177e4 LT |
361 | } |
362 | ||
c0d3fb39 TI |
363 | EXPORT_SYMBOL(snd_ctl_add); |
364 | ||
1da177e4 LT |
365 | /** |
366 | * snd_ctl_remove - remove the control from the card and release it | |
367 | * @card: the card instance | |
368 | * @kcontrol: the control instance to remove | |
369 | * | |
370 | * Removes the control from the card and then releases the instance. | |
371 | * You don't need to call snd_ctl_free_one(). You must be in | |
372 | * the write lock - down_write(&card->controls_rwsem). | |
373 | * | |
374 | * Returns 0 if successful, or a negative error code on failure. | |
375 | */ | |
82e9bae6 | 376 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 377 | { |
82e9bae6 | 378 | struct snd_ctl_elem_id id; |
1da177e4 LT |
379 | unsigned int idx; |
380 | ||
7eaa943c TI |
381 | if (snd_BUG_ON(!card || !kcontrol)) |
382 | return -EINVAL; | |
1da177e4 LT |
383 | list_del(&kcontrol->list); |
384 | card->controls_count -= kcontrol->count; | |
385 | id = kcontrol->id; | |
386 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
387 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
388 | snd_ctl_free_one(kcontrol); | |
389 | return 0; | |
390 | } | |
391 | ||
c0d3fb39 TI |
392 | EXPORT_SYMBOL(snd_ctl_remove); |
393 | ||
1da177e4 LT |
394 | /** |
395 | * snd_ctl_remove_id - remove the control of the given id and release it | |
396 | * @card: the card instance | |
397 | * @id: the control id to remove | |
398 | * | |
399 | * Finds the control instance with the given id, removes it from the | |
400 | * card list and releases it. | |
401 | * | |
402 | * Returns 0 if successful, or a negative error code on failure. | |
403 | */ | |
82e9bae6 | 404 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 405 | { |
82e9bae6 | 406 | struct snd_kcontrol *kctl; |
1da177e4 LT |
407 | int ret; |
408 | ||
409 | down_write(&card->controls_rwsem); | |
410 | kctl = snd_ctl_find_id(card, id); | |
411 | if (kctl == NULL) { | |
412 | up_write(&card->controls_rwsem); | |
413 | return -ENOENT; | |
414 | } | |
415 | ret = snd_ctl_remove(card, kctl); | |
416 | up_write(&card->controls_rwsem); | |
417 | return ret; | |
418 | } | |
419 | ||
c0d3fb39 TI |
420 | EXPORT_SYMBOL(snd_ctl_remove_id); |
421 | ||
1da177e4 | 422 | /** |
f217ac59 | 423 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
424 | * @file: active control handle |
425 | * @id: the control id to remove | |
426 | * | |
427 | * Finds the control instance with the given id, removes it from the | |
428 | * card list and releases it. | |
429 | * | |
430 | * Returns 0 if successful, or a negative error code on failure. | |
431 | */ | |
f217ac59 CL |
432 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
433 | struct snd_ctl_elem_id *id) | |
1da177e4 | 434 | { |
82e9bae6 TI |
435 | struct snd_card *card = file->card; |
436 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
437 | int idx, ret; |
438 | ||
439 | down_write(&card->controls_rwsem); | |
440 | kctl = snd_ctl_find_id(card, id); | |
441 | if (kctl == NULL) { | |
317b8081 CL |
442 | ret = -ENOENT; |
443 | goto error; | |
1da177e4 | 444 | } |
18dd0aa5 CL |
445 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
446 | ret = -EINVAL; | |
447 | goto error; | |
448 | } | |
1da177e4 LT |
449 | for (idx = 0; idx < kctl->count; idx++) |
450 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
451 | ret = -EBUSY; |
452 | goto error; | |
1da177e4 LT |
453 | } |
454 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
455 | if (ret < 0) |
456 | goto error; | |
457 | card->user_ctl_count--; | |
317b8081 | 458 | error: |
1da177e4 LT |
459 | up_write(&card->controls_rwsem); |
460 | return ret; | |
461 | } | |
462 | ||
463 | /** | |
464 | * snd_ctl_rename_id - replace the id of a control on the card | |
465 | * @card: the card instance | |
466 | * @src_id: the old id | |
467 | * @dst_id: the new id | |
468 | * | |
469 | * Finds the control with the old id from the card, and replaces the | |
470 | * id with the new one. | |
471 | * | |
472 | * Returns zero if successful, or a negative error code on failure. | |
473 | */ | |
82e9bae6 TI |
474 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
475 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 476 | { |
82e9bae6 | 477 | struct snd_kcontrol *kctl; |
1da177e4 LT |
478 | |
479 | down_write(&card->controls_rwsem); | |
480 | kctl = snd_ctl_find_id(card, src_id); | |
481 | if (kctl == NULL) { | |
482 | up_write(&card->controls_rwsem); | |
483 | return -ENOENT; | |
484 | } | |
485 | kctl->id = *dst_id; | |
486 | kctl->id.numid = card->last_numid + 1; | |
487 | card->last_numid += kctl->count; | |
488 | up_write(&card->controls_rwsem); | |
489 | return 0; | |
490 | } | |
491 | ||
c0d3fb39 TI |
492 | EXPORT_SYMBOL(snd_ctl_rename_id); |
493 | ||
1da177e4 LT |
494 | /** |
495 | * snd_ctl_find_numid - find the control instance with the given number-id | |
496 | * @card: the card instance | |
497 | * @numid: the number-id to search | |
498 | * | |
499 | * Finds the control instance with the given number-id from the card. | |
500 | * | |
501 | * Returns the pointer of the instance if found, or NULL if not. | |
502 | * | |
503 | * The caller must down card->controls_rwsem before calling this function | |
504 | * (if the race condition can happen). | |
505 | */ | |
82e9bae6 | 506 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 507 | { |
82e9bae6 | 508 | struct snd_kcontrol *kctl; |
1da177e4 | 509 | |
7eaa943c TI |
510 | if (snd_BUG_ON(!card || !numid)) |
511 | return NULL; | |
9244b2c3 | 512 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
513 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
514 | return kctl; | |
515 | } | |
516 | return NULL; | |
517 | } | |
518 | ||
c0d3fb39 TI |
519 | EXPORT_SYMBOL(snd_ctl_find_numid); |
520 | ||
1da177e4 LT |
521 | /** |
522 | * snd_ctl_find_id - find the control instance with the given id | |
523 | * @card: the card instance | |
524 | * @id: the id to search | |
525 | * | |
526 | * Finds the control instance with the given id from the card. | |
527 | * | |
528 | * Returns the pointer of the instance if found, or NULL if not. | |
529 | * | |
530 | * The caller must down card->controls_rwsem before calling this function | |
531 | * (if the race condition can happen). | |
532 | */ | |
82e9bae6 TI |
533 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
534 | struct snd_ctl_elem_id *id) | |
1da177e4 | 535 | { |
82e9bae6 | 536 | struct snd_kcontrol *kctl; |
1da177e4 | 537 | |
7eaa943c TI |
538 | if (snd_BUG_ON(!card || !id)) |
539 | return NULL; | |
1da177e4 LT |
540 | if (id->numid != 0) |
541 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 542 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
543 | if (kctl->id.iface != id->iface) |
544 | continue; | |
545 | if (kctl->id.device != id->device) | |
546 | continue; | |
547 | if (kctl->id.subdevice != id->subdevice) | |
548 | continue; | |
549 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
550 | continue; | |
551 | if (kctl->id.index > id->index) | |
552 | continue; | |
553 | if (kctl->id.index + kctl->count <= id->index) | |
554 | continue; | |
555 | return kctl; | |
556 | } | |
557 | return NULL; | |
558 | } | |
559 | ||
c0d3fb39 TI |
560 | EXPORT_SYMBOL(snd_ctl_find_id); |
561 | ||
82e9bae6 | 562 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
563 | unsigned int cmd, void __user *arg) |
564 | { | |
82e9bae6 | 565 | struct snd_ctl_card_info *info; |
1da177e4 | 566 | |
ca2c0966 | 567 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
568 | if (! info) |
569 | return -ENOMEM; | |
570 | down_read(&snd_ioctl_rwsem); | |
571 | info->card = card->number; | |
572 | strlcpy(info->id, card->id, sizeof(info->id)); | |
573 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
574 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
575 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
576 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
577 | strlcpy(info->components, card->components, sizeof(info->components)); | |
578 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 579 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
580 | kfree(info); |
581 | return -EFAULT; | |
582 | } | |
583 | kfree(info); | |
584 | return 0; | |
585 | } | |
586 | ||
82e9bae6 TI |
587 | static int snd_ctl_elem_list(struct snd_card *card, |
588 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
589 | { |
590 | struct list_head *plist; | |
82e9bae6 TI |
591 | struct snd_ctl_elem_list list; |
592 | struct snd_kcontrol *kctl; | |
593 | struct snd_ctl_elem_id *dst, *id; | |
1da177e4 LT |
594 | unsigned int offset, space, first, jidx; |
595 | ||
596 | if (copy_from_user(&list, _list, sizeof(list))) | |
597 | return -EFAULT; | |
598 | offset = list.offset; | |
599 | space = list.space; | |
600 | first = 0; | |
601 | /* try limit maximum space */ | |
602 | if (space > 16384) | |
603 | return -ENOMEM; | |
604 | if (space > 0) { | |
605 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 606 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
607 | if (dst == NULL) |
608 | return -ENOMEM; | |
609 | down_read(&card->controls_rwsem); | |
610 | list.count = card->controls_count; | |
611 | plist = card->controls.next; | |
612 | while (plist != &card->controls) { | |
613 | if (offset == 0) | |
614 | break; | |
615 | kctl = snd_kcontrol(plist); | |
616 | if (offset < kctl->count) | |
617 | break; | |
618 | offset -= kctl->count; | |
619 | plist = plist->next; | |
620 | } | |
621 | list.used = 0; | |
622 | id = dst; | |
623 | while (space > 0 && plist != &card->controls) { | |
624 | kctl = snd_kcontrol(plist); | |
625 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
626 | snd_ctl_build_ioff(id, kctl, jidx); | |
627 | id++; | |
628 | space--; | |
629 | list.used++; | |
630 | } | |
631 | plist = plist->next; | |
632 | offset = 0; | |
633 | } | |
634 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
635 | if (list.used > 0 && |
636 | copy_to_user(list.pids, dst, | |
637 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
638 | vfree(dst); |
639 | return -EFAULT; | |
640 | } | |
641 | vfree(dst); | |
642 | } else { | |
643 | down_read(&card->controls_rwsem); | |
644 | list.count = card->controls_count; | |
645 | up_read(&card->controls_rwsem); | |
646 | } | |
647 | if (copy_to_user(_list, &list, sizeof(list))) | |
648 | return -EFAULT; | |
649 | return 0; | |
650 | } | |
651 | ||
82e9bae6 TI |
652 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
653 | struct snd_ctl_elem_info *info) | |
1da177e4 | 654 | { |
82e9bae6 TI |
655 | struct snd_card *card = ctl->card; |
656 | struct snd_kcontrol *kctl; | |
657 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
658 | unsigned int index_offset; |
659 | int result; | |
660 | ||
661 | down_read(&card->controls_rwsem); | |
662 | kctl = snd_ctl_find_id(card, &info->id); | |
663 | if (kctl == NULL) { | |
664 | up_read(&card->controls_rwsem); | |
665 | return -ENOENT; | |
666 | } | |
667 | #ifdef CONFIG_SND_DEBUG | |
668 | info->access = 0; | |
669 | #endif | |
670 | result = kctl->info(kctl, info); | |
671 | if (result >= 0) { | |
7eaa943c | 672 | snd_BUG_ON(info->access); |
1da177e4 LT |
673 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
674 | vd = &kctl->vd[index_offset]; | |
675 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
676 | info->access = vd->access; | |
677 | if (vd->owner) { | |
678 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
679 | if (vd->owner == ctl) | |
680 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 681 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
682 | } else { |
683 | info->owner = -1; | |
684 | } | |
685 | } | |
686 | up_read(&card->controls_rwsem); | |
687 | return result; | |
688 | } | |
689 | ||
82e9bae6 TI |
690 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
691 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 692 | { |
82e9bae6 | 693 | struct snd_ctl_elem_info info; |
1da177e4 LT |
694 | int result; |
695 | ||
696 | if (copy_from_user(&info, _info, sizeof(info))) | |
697 | return -EFAULT; | |
64649400 | 698 | snd_power_lock(ctl->card); |
cbac4b0c | 699 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
700 | if (result >= 0) |
701 | result = snd_ctl_elem_info(ctl, &info); | |
702 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
703 | if (result >= 0) |
704 | if (copy_to_user(_info, &info, sizeof(info))) | |
705 | return -EFAULT; | |
706 | return result; | |
707 | } | |
708 | ||
d3bd67cd TI |
709 | static int snd_ctl_elem_read(struct snd_card *card, |
710 | struct snd_ctl_elem_value *control) | |
1da177e4 | 711 | { |
82e9bae6 TI |
712 | struct snd_kcontrol *kctl; |
713 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 714 | unsigned int index_offset; |
8ace4f3c | 715 | int result; |
1da177e4 LT |
716 | |
717 | down_read(&card->controls_rwsem); | |
718 | kctl = snd_ctl_find_id(card, &control->id); | |
719 | if (kctl == NULL) { | |
720 | result = -ENOENT; | |
721 | } else { | |
722 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
723 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
724 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
725 | kctl->get != NULL) { | |
726 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
727 | result = kctl->get(kctl, control); | |
728 | } else | |
729 | result = -EPERM; | |
1da177e4 LT |
730 | } |
731 | up_read(&card->controls_rwsem); | |
732 | return result; | |
733 | } | |
734 | ||
82e9bae6 TI |
735 | static int snd_ctl_elem_read_user(struct snd_card *card, |
736 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 737 | { |
82e9bae6 | 738 | struct snd_ctl_elem_value *control; |
1da177e4 | 739 | int result; |
ef44a1ec LZ |
740 | |
741 | control = memdup_user(_control, sizeof(*control)); | |
742 | if (IS_ERR(control)) | |
743 | return PTR_ERR(control); | |
744 | ||
64649400 | 745 | snd_power_lock(card); |
cbac4b0c | 746 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
747 | if (result >= 0) |
748 | result = snd_ctl_elem_read(card, control); | |
749 | snd_power_unlock(card); | |
1da177e4 LT |
750 | if (result >= 0) |
751 | if (copy_to_user(_control, control, sizeof(*control))) | |
752 | result = -EFAULT; | |
753 | kfree(control); | |
754 | return result; | |
755 | } | |
756 | ||
d3bd67cd TI |
757 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
758 | struct snd_ctl_elem_value *control) | |
1da177e4 | 759 | { |
82e9bae6 TI |
760 | struct snd_kcontrol *kctl; |
761 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 762 | unsigned int index_offset; |
8ace4f3c | 763 | int result; |
1da177e4 LT |
764 | |
765 | down_read(&card->controls_rwsem); | |
766 | kctl = snd_ctl_find_id(card, &control->id); | |
767 | if (kctl == NULL) { | |
768 | result = -ENOENT; | |
769 | } else { | |
770 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
771 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
772 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
773 | kctl->put == NULL || | |
774 | (file && vd->owner && vd->owner != file)) { | |
775 | result = -EPERM; | |
1da177e4 | 776 | } else { |
8ace4f3c TI |
777 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
778 | result = kctl->put(kctl, control); | |
779 | } | |
780 | if (result > 0) { | |
781 | up_read(&card->controls_rwsem); | |
782 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
783 | &control->id); | |
784 | return 0; | |
1da177e4 LT |
785 | } |
786 | } | |
787 | up_read(&card->controls_rwsem); | |
788 | return result; | |
789 | } | |
790 | ||
82e9bae6 TI |
791 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
792 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 793 | { |
82e9bae6 | 794 | struct snd_ctl_elem_value *control; |
64649400 | 795 | struct snd_card *card; |
1da177e4 LT |
796 | int result; |
797 | ||
ef44a1ec LZ |
798 | control = memdup_user(_control, sizeof(*control)); |
799 | if (IS_ERR(control)) | |
800 | return PTR_ERR(control); | |
801 | ||
64649400 GP |
802 | card = file->card; |
803 | snd_power_lock(card); | |
cbac4b0c | 804 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
805 | if (result >= 0) |
806 | result = snd_ctl_elem_write(card, file, control); | |
807 | snd_power_unlock(card); | |
1da177e4 LT |
808 | if (result >= 0) |
809 | if (copy_to_user(_control, control, sizeof(*control))) | |
810 | result = -EFAULT; | |
811 | kfree(control); | |
812 | return result; | |
813 | } | |
814 | ||
82e9bae6 TI |
815 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
816 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 817 | { |
82e9bae6 TI |
818 | struct snd_card *card = file->card; |
819 | struct snd_ctl_elem_id id; | |
820 | struct snd_kcontrol *kctl; | |
821 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
822 | int result; |
823 | ||
824 | if (copy_from_user(&id, _id, sizeof(id))) | |
825 | return -EFAULT; | |
826 | down_write(&card->controls_rwsem); | |
827 | kctl = snd_ctl_find_id(card, &id); | |
828 | if (kctl == NULL) { | |
829 | result = -ENOENT; | |
830 | } else { | |
831 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
832 | if (vd->owner != NULL) | |
833 | result = -EBUSY; | |
834 | else { | |
835 | vd->owner = file; | |
1da177e4 LT |
836 | result = 0; |
837 | } | |
838 | } | |
839 | up_write(&card->controls_rwsem); | |
840 | return result; | |
841 | } | |
842 | ||
82e9bae6 TI |
843 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
844 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 845 | { |
82e9bae6 TI |
846 | struct snd_card *card = file->card; |
847 | struct snd_ctl_elem_id id; | |
848 | struct snd_kcontrol *kctl; | |
849 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
850 | int result; |
851 | ||
852 | if (copy_from_user(&id, _id, sizeof(id))) | |
853 | return -EFAULT; | |
854 | down_write(&card->controls_rwsem); | |
855 | kctl = snd_ctl_find_id(card, &id); | |
856 | if (kctl == NULL) { | |
857 | result = -ENOENT; | |
858 | } else { | |
859 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
860 | if (vd->owner == NULL) | |
861 | result = -EINVAL; | |
862 | else if (vd->owner != file) | |
863 | result = -EPERM; | |
864 | else { | |
865 | vd->owner = NULL; | |
1da177e4 LT |
866 | result = 0; |
867 | } | |
868 | } | |
869 | up_write(&card->controls_rwsem); | |
870 | return result; | |
871 | } | |
872 | ||
873 | struct user_element { | |
82e9bae6 | 874 | struct snd_ctl_elem_info info; |
1da177e4 LT |
875 | void *elem_data; /* element data */ |
876 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
877 | void *tlv_data; /* TLV data */ |
878 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 LT |
879 | void *priv_data; /* private data (like strings for enumerated type) */ |
880 | unsigned long priv_data_size; /* size of private data in bytes */ | |
881 | }; | |
882 | ||
82e9bae6 TI |
883 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
884 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
885 | { |
886 | struct user_element *ue = kcontrol->private_data; | |
887 | ||
888 | *uinfo = ue->info; | |
889 | return 0; | |
890 | } | |
891 | ||
82e9bae6 TI |
892 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
893 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
894 | { |
895 | struct user_element *ue = kcontrol->private_data; | |
896 | ||
897 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
898 | return 0; | |
899 | } | |
900 | ||
82e9bae6 TI |
901 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
902 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
903 | { |
904 | int change; | |
905 | struct user_element *ue = kcontrol->private_data; | |
906 | ||
907 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
908 | if (change) | |
909 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
910 | return change; | |
911 | } | |
912 | ||
8aa9b586 JK |
913 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
914 | int op_flag, | |
915 | unsigned int size, | |
916 | unsigned int __user *tlv) | |
917 | { | |
918 | struct user_element *ue = kcontrol->private_data; | |
919 | int change = 0; | |
920 | void *new_data; | |
921 | ||
922 | if (op_flag > 0) { | |
923 | if (size > 1024 * 128) /* sane value */ | |
924 | return -EINVAL; | |
ef44a1ec LZ |
925 | |
926 | new_data = memdup_user(tlv, size); | |
927 | if (IS_ERR(new_data)) | |
928 | return PTR_ERR(new_data); | |
8aa9b586 JK |
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; | |
2a031aed | 966 | if (info->count < 1) |
1da177e4 LT |
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 | |
1068 | if (copy_from_user(&id, _id, sizeof(id))) | |
1069 | return -EFAULT; | |
f217ac59 | 1070 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1071 | } |
1072 | ||
82e9bae6 | 1073 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1074 | { |
1075 | int subscribe; | |
1076 | if (get_user(subscribe, ptr)) | |
1077 | return -EFAULT; | |
1078 | if (subscribe < 0) { | |
1079 | subscribe = file->subscribed; | |
1080 | if (put_user(subscribe, ptr)) | |
1081 | return -EFAULT; | |
1082 | return 0; | |
1083 | } | |
1084 | if (subscribe) { | |
1085 | file->subscribed = 1; | |
1086 | return 0; | |
1087 | } else if (file->subscribed) { | |
1088 | snd_ctl_empty_read_queue(file); | |
1089 | file->subscribed = 0; | |
1090 | } | |
1091 | return 0; | |
1092 | } | |
1093 | ||
8aa9b586 JK |
1094 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1095 | struct snd_ctl_tlv __user *_tlv, | |
1096 | int op_flag) | |
42750b04 | 1097 | { |
8aa9b586 | 1098 | struct snd_card *card = file->card; |
42750b04 JK |
1099 | struct snd_ctl_tlv tlv; |
1100 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1101 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1102 | unsigned int len; |
1103 | int err = 0; | |
1104 | ||
1105 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1106 | return -EFAULT; | |
6123637f | 1107 | if (tlv.length < sizeof(unsigned int) * 2) |
8aa9b586 JK |
1108 | return -EINVAL; |
1109 | down_read(&card->controls_rwsem); | |
1110 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1111 | if (kctl == NULL) { | |
1112 | err = -ENOENT; | |
1113 | goto __kctl_end; | |
1114 | } | |
1115 | if (kctl->tlv.p == NULL) { | |
1116 | err = -ENXIO; | |
1117 | goto __kctl_end; | |
1118 | } | |
1119 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1120 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1121 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1122 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1123 | err = -ENXIO; | |
1124 | goto __kctl_end; | |
1125 | } | |
1126 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
bec145ae | 1127 | if (vd->owner != NULL && vd->owner != file) { |
8aa9b586 JK |
1128 | err = -EPERM; |
1129 | goto __kctl_end; | |
1130 | } | |
1131 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); | |
1132 | if (err > 0) { | |
1133 | up_read(&card->controls_rwsem); | |
1134 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1135 | return 0; | |
1136 | } | |
1137 | } else { | |
1138 | if (op_flag) { | |
1139 | err = -ENXIO; | |
1140 | goto __kctl_end; | |
1141 | } | |
1142 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1143 | if (tlv.length < len) { | |
1144 | err = -ENOMEM; | |
1145 | goto __kctl_end; | |
1146 | } | |
1147 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1148 | err = -EFAULT; | |
1149 | } | |
42750b04 | 1150 | __kctl_end: |
8aa9b586 JK |
1151 | up_read(&card->controls_rwsem); |
1152 | return err; | |
42750b04 JK |
1153 | } |
1154 | ||
1da177e4 LT |
1155 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1156 | { | |
82e9bae6 TI |
1157 | struct snd_ctl_file *ctl; |
1158 | struct snd_card *card; | |
82e9bae6 | 1159 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1160 | void __user *argp = (void __user *)arg; |
1161 | int __user *ip = argp; | |
1162 | int err; | |
1163 | ||
1164 | ctl = file->private_data; | |
1165 | card = ctl->card; | |
7eaa943c TI |
1166 | if (snd_BUG_ON(!card)) |
1167 | return -ENXIO; | |
1da177e4 LT |
1168 | switch (cmd) { |
1169 | case SNDRV_CTL_IOCTL_PVERSION: | |
1170 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1171 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1172 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1173 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1174 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1175 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1176 | return snd_ctl_elem_info_user(ctl, argp); | |
1177 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1178 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1179 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1180 | return snd_ctl_elem_write_user(ctl, argp); | |
1181 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1182 | return snd_ctl_elem_lock(ctl, argp); | |
1183 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1184 | return snd_ctl_elem_unlock(ctl, argp); | |
1185 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1186 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1187 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1188 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1189 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1190 | return snd_ctl_elem_remove(ctl, argp); | |
1191 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1192 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 JK |
1193 | case SNDRV_CTL_IOCTL_TLV_READ: |
1194 | return snd_ctl_tlv_ioctl(ctl, argp, 0); | |
1195 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
1196 | return snd_ctl_tlv_ioctl(ctl, argp, 1); | |
1197 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1198 | return snd_ctl_tlv_ioctl(ctl, argp, -1); | |
1da177e4 | 1199 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1200 | return -ENOPROTOOPT; |
1da177e4 LT |
1201 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1202 | #ifdef CONFIG_PM | |
1203 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1204 | #else | |
1205 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1206 | #endif | |
1207 | } | |
1208 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1209 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1210 | err = p->fioctl(card, ctl, cmd, arg); |
1211 | if (err != -ENOIOCTLCMD) { | |
1212 | up_read(&snd_ioctl_rwsem); | |
1213 | return err; | |
1214 | } | |
1215 | } | |
1216 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1217 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1218 | return -ENOTTY; |
1219 | } | |
1220 | ||
82e9bae6 TI |
1221 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1222 | size_t count, loff_t * offset) | |
1da177e4 | 1223 | { |
82e9bae6 | 1224 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1225 | int err = 0; |
1226 | ssize_t result = 0; | |
1227 | ||
1228 | ctl = file->private_data; | |
7eaa943c TI |
1229 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1230 | return -ENXIO; | |
1da177e4 LT |
1231 | if (!ctl->subscribed) |
1232 | return -EBADFD; | |
82e9bae6 | 1233 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1234 | return -EINVAL; |
1235 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1236 | while (count >= sizeof(struct snd_ctl_event)) { |
1237 | struct snd_ctl_event ev; | |
1238 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1239 | while (list_empty(&ctl->events)) { |
1240 | wait_queue_t wait; | |
1241 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1242 | err = -EAGAIN; | |
1243 | goto __end_lock; | |
1244 | } | |
1245 | init_waitqueue_entry(&wait, current); | |
1246 | add_wait_queue(&ctl->change_sleep, &wait); | |
1247 | set_current_state(TASK_INTERRUPTIBLE); | |
1248 | spin_unlock_irq(&ctl->read_lock); | |
1249 | schedule(); | |
1250 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1251 | if (signal_pending(current)) | |
0e5d720c | 1252 | return -ERESTARTSYS; |
1da177e4 LT |
1253 | spin_lock_irq(&ctl->read_lock); |
1254 | } | |
1255 | kev = snd_kctl_event(ctl->events.next); | |
1256 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1257 | ev.data.elem.mask = kev->mask; | |
1258 | ev.data.elem.id = kev->id; | |
1259 | list_del(&kev->list); | |
1260 | spin_unlock_irq(&ctl->read_lock); | |
1261 | kfree(kev); | |
82e9bae6 | 1262 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1263 | err = -EFAULT; |
1264 | goto __end; | |
1265 | } | |
1266 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1267 | buffer += sizeof(struct snd_ctl_event); |
1268 | count -= sizeof(struct snd_ctl_event); | |
1269 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1270 | } |
1271 | __end_lock: | |
1272 | spin_unlock_irq(&ctl->read_lock); | |
1273 | __end: | |
1274 | return result > 0 ? result : err; | |
1275 | } | |
1276 | ||
1277 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1278 | { | |
1279 | unsigned int mask; | |
82e9bae6 | 1280 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1281 | |
1282 | ctl = file->private_data; | |
1283 | if (!ctl->subscribed) | |
1284 | return 0; | |
1285 | poll_wait(file, &ctl->change_sleep, wait); | |
1286 | ||
1287 | mask = 0; | |
1288 | if (!list_empty(&ctl->events)) | |
1289 | mask |= POLLIN | POLLRDNORM; | |
1290 | ||
1291 | return mask; | |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * register the device-specific control-ioctls. | |
1296 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1297 | */ | |
1298 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1299 | { | |
82e9bae6 | 1300 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1301 | |
82e9bae6 | 1302 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1303 | if (pn == NULL) |
1304 | return -ENOMEM; | |
1305 | pn->fioctl = fcn; | |
1306 | down_write(&snd_ioctl_rwsem); | |
1307 | list_add_tail(&pn->list, lists); | |
1308 | up_write(&snd_ioctl_rwsem); | |
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1313 | { | |
1314 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1315 | } | |
1316 | ||
c0d3fb39 TI |
1317 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1318 | ||
1da177e4 LT |
1319 | #ifdef CONFIG_COMPAT |
1320 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1321 | { | |
1322 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1323 | } | |
c0d3fb39 TI |
1324 | |
1325 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1326 | #endif |
1327 | ||
1328 | /* | |
1329 | * de-register the device-specific control-ioctls. | |
1330 | */ | |
82e9bae6 TI |
1331 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1332 | struct list_head *lists) | |
1da177e4 | 1333 | { |
82e9bae6 | 1334 | struct snd_kctl_ioctl *p; |
1da177e4 | 1335 | |
7eaa943c TI |
1336 | if (snd_BUG_ON(!fcn)) |
1337 | return -EINVAL; | |
1da177e4 | 1338 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1339 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1340 | if (p->fioctl == fcn) { |
1341 | list_del(&p->list); | |
1342 | up_write(&snd_ioctl_rwsem); | |
1343 | kfree(p); | |
1344 | return 0; | |
1345 | } | |
1346 | } | |
1347 | up_write(&snd_ioctl_rwsem); | |
1348 | snd_BUG(); | |
1349 | return -EINVAL; | |
1350 | } | |
1351 | ||
1352 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1353 | { | |
1354 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1355 | } | |
1356 | ||
c0d3fb39 TI |
1357 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1358 | ||
1da177e4 LT |
1359 | #ifdef CONFIG_COMPAT |
1360 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1361 | { | |
1362 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1363 | } | |
1364 | ||
c0d3fb39 | 1365 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1366 | #endif |
1367 | ||
1368 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1369 | { | |
82e9bae6 | 1370 | struct snd_ctl_file *ctl; |
60aa4924 | 1371 | |
1da177e4 | 1372 | ctl = file->private_data; |
60aa4924 | 1373 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | /* | |
1377 | * ioctl32 compat | |
1378 | */ | |
1379 | #ifdef CONFIG_COMPAT | |
1380 | #include "control_compat.c" | |
1381 | #else | |
1382 | #define snd_ctl_ioctl_compat NULL | |
1383 | #endif | |
1384 | ||
1385 | /* | |
1386 | * INIT PART | |
1387 | */ | |
1388 | ||
9c2e08c5 | 1389 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1390 | { |
1391 | .owner = THIS_MODULE, | |
1392 | .read = snd_ctl_read, | |
1393 | .open = snd_ctl_open, | |
1394 | .release = snd_ctl_release, | |
02f4865f | 1395 | .llseek = no_llseek, |
1da177e4 LT |
1396 | .poll = snd_ctl_poll, |
1397 | .unlocked_ioctl = snd_ctl_ioctl, | |
1398 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1399 | .fasync = snd_ctl_fasync, | |
1400 | }; | |
1401 | ||
1da177e4 LT |
1402 | /* |
1403 | * registration of the control device | |
1404 | */ | |
82e9bae6 | 1405 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1406 | { |
82e9bae6 | 1407 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1408 | int err, cardnum; |
1409 | char name[16]; | |
1410 | ||
7eaa943c TI |
1411 | if (snd_BUG_ON(!card)) |
1412 | return -ENXIO; | |
1da177e4 | 1413 | cardnum = card->number; |
7eaa943c TI |
1414 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1415 | return -ENXIO; | |
1da177e4 | 1416 | sprintf(name, "controlC%i", cardnum); |
f87135f5 CL |
1417 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1418 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1419 | return err; |
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | /* | |
1424 | * disconnection of the control device | |
1425 | */ | |
82e9bae6 | 1426 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1427 | { |
82e9bae6 | 1428 | struct snd_card *card = device->device_data; |
82e9bae6 | 1429 | struct snd_ctl_file *ctl; |
c461482c TI |
1430 | int err, cardnum; |
1431 | ||
7eaa943c TI |
1432 | if (snd_BUG_ON(!card)) |
1433 | return -ENXIO; | |
c461482c | 1434 | cardnum = card->number; |
7eaa943c TI |
1435 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1436 | return -ENXIO; | |
1da177e4 | 1437 | |
d8009882 | 1438 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1439 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1440 | wake_up(&ctl->change_sleep); |
1441 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1442 | } | |
d8009882 | 1443 | read_unlock(&card->ctl_files_rwlock); |
c461482c TI |
1444 | |
1445 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1446 | card, -1)) < 0) | |
1447 | return err; | |
1da177e4 LT |
1448 | return 0; |
1449 | } | |
1450 | ||
1451 | /* | |
1452 | * free all controls | |
1453 | */ | |
82e9bae6 | 1454 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1455 | { |
82e9bae6 TI |
1456 | struct snd_card *card = device->device_data; |
1457 | struct snd_kcontrol *control; | |
1da177e4 LT |
1458 | |
1459 | down_write(&card->controls_rwsem); | |
1460 | while (!list_empty(&card->controls)) { | |
1461 | control = snd_kcontrol(card->controls.next); | |
1462 | snd_ctl_remove(card, control); | |
1463 | } | |
1464 | up_write(&card->controls_rwsem); | |
1465 | return 0; | |
1466 | } | |
1467 | ||
1da177e4 LT |
1468 | /* |
1469 | * create control core: | |
1470 | * called from init.c | |
1471 | */ | |
82e9bae6 | 1472 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1473 | { |
82e9bae6 | 1474 | static struct snd_device_ops ops = { |
1da177e4 LT |
1475 | .dev_free = snd_ctl_dev_free, |
1476 | .dev_register = snd_ctl_dev_register, | |
1477 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1478 | }; |
1479 | ||
7eaa943c TI |
1480 | if (snd_BUG_ON(!card)) |
1481 | return -ENXIO; | |
1da177e4 LT |
1482 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); |
1483 | } | |
b9ed4f2b TI |
1484 | |
1485 | /* | |
1486 | * Frequently used control callbacks | |
1487 | */ | |
1488 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
1489 | struct snd_ctl_elem_info *uinfo) | |
1490 | { | |
1491 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1492 | uinfo->count = 1; | |
1493 | uinfo->value.integer.min = 0; | |
1494 | uinfo->value.integer.max = 1; | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); | |
1499 | ||
1500 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
1501 | struct snd_ctl_elem_info *uinfo) | |
1502 | { | |
1503 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1504 | uinfo->count = 2; | |
1505 | uinfo->value.integer.min = 0; | |
1506 | uinfo->value.integer.max = 1; | |
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |