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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 | ||
f87135f5 | 53 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
54 | if (!card) { |
55 | err = -ENODEV; | |
56 | goto __error1; | |
57 | } | |
58 | err = snd_card_file_add(card, file); | |
59 | if (err < 0) { | |
60 | err = -ENODEV; | |
61 | goto __error1; | |
62 | } | |
63 | if (!try_module_get(card->module)) { | |
64 | err = -EFAULT; | |
65 | goto __error2; | |
66 | } | |
ca2c0966 | 67 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
68 | if (ctl == NULL) { |
69 | err = -ENOMEM; | |
70 | goto __error; | |
71 | } | |
72 | INIT_LIST_HEAD(&ctl->events); | |
73 | init_waitqueue_head(&ctl->change_sleep); | |
74 | spin_lock_init(&ctl->read_lock); | |
75 | ctl->card = card; | |
2529bba7 TI |
76 | ctl->prefer_pcm_subdevice = -1; |
77 | ctl->prefer_rawmidi_subdevice = -1; | |
1da177e4 LT |
78 | ctl->pid = current->pid; |
79 | file->private_data = ctl; | |
80 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
81 | list_add_tail(&ctl->list, &card->ctl_files); | |
82 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
83 | return 0; | |
84 | ||
85 | __error: | |
86 | module_put(card->module); | |
87 | __error2: | |
88 | snd_card_file_remove(card, file); | |
89 | __error1: | |
90 | return err; | |
91 | } | |
92 | ||
82e9bae6 | 93 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 94 | { |
7507e8da | 95 | unsigned long flags; |
82e9bae6 | 96 | struct snd_kctl_event *cread; |
1da177e4 | 97 | |
7507e8da | 98 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
99 | while (!list_empty(&ctl->events)) { |
100 | cread = snd_kctl_event(ctl->events.next); | |
101 | list_del(&cread->list); | |
102 | kfree(cread); | |
103 | } | |
7507e8da | 104 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
105 | } |
106 | ||
107 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
108 | { | |
109 | unsigned long flags; | |
82e9bae6 TI |
110 | struct snd_card *card; |
111 | struct snd_ctl_file *ctl; | |
112 | struct snd_kcontrol *control; | |
1da177e4 LT |
113 | unsigned int idx; |
114 | ||
115 | ctl = file->private_data; | |
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); | |
128 | kfree(ctl); | |
129 | module_put(card->module); | |
130 | snd_card_file_remove(card, file); | |
131 | return 0; | |
132 | } | |
133 | ||
82e9bae6 TI |
134 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
135 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
136 | { |
137 | unsigned long flags; | |
82e9bae6 TI |
138 | struct snd_ctl_file *ctl; |
139 | struct snd_kctl_event *ev; | |
1da177e4 | 140 | |
7eaa943c TI |
141 | if (snd_BUG_ON(!card || !id)) |
142 | return; | |
1da177e4 LT |
143 | read_lock(&card->ctl_files_rwlock); |
144 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
145 | card->mixer_oss_change_count++; | |
146 | #endif | |
9244b2c3 | 147 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
148 | if (!ctl->subscribed) |
149 | continue; | |
150 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 151 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
152 | if (ev->id.numid == id->numid) { |
153 | ev->mask |= mask; | |
154 | goto _found; | |
155 | } | |
156 | } | |
ca2c0966 | 157 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
158 | if (ev) { |
159 | ev->id = *id; | |
160 | ev->mask = mask; | |
161 | list_add_tail(&ev->list, &ctl->events); | |
162 | } else { | |
163 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
164 | } | |
165 | _found: | |
166 | wake_up(&ctl->change_sleep); | |
167 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
168 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
169 | } | |
170 | read_unlock(&card->ctl_files_rwlock); | |
171 | } | |
172 | ||
c0d3fb39 TI |
173 | EXPORT_SYMBOL(snd_ctl_notify); |
174 | ||
1da177e4 LT |
175 | /** |
176 | * snd_ctl_new - create a control instance from the template | |
177 | * @control: the control template | |
178 | * @access: the default control access | |
179 | * | |
82e9bae6 | 180 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
181 | * to the new instance. It does not copy volatile data (access). |
182 | * | |
183 | * Returns the pointer of the new instance, or NULL on failure. | |
184 | */ | |
0b51ba07 AB |
185 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
186 | unsigned int access) | |
1da177e4 | 187 | { |
82e9bae6 | 188 | struct snd_kcontrol *kctl; |
1da177e4 LT |
189 | unsigned int idx; |
190 | ||
7eaa943c TI |
191 | if (snd_BUG_ON(!control || !control->count)) |
192 | return NULL; | |
82e9bae6 | 193 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 TI |
194 | if (kctl == NULL) { |
195 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); | |
1da177e4 | 196 | return NULL; |
73e77ba0 | 197 | } |
1da177e4 LT |
198 | *kctl = *control; |
199 | for (idx = 0; idx < kctl->count; idx++) | |
200 | kctl->vd[idx].access = access; | |
201 | return kctl; | |
202 | } | |
203 | ||
204 | /** | |
205 | * snd_ctl_new1 - create a control instance from the template | |
206 | * @ncontrol: the initialization record | |
207 | * @private_data: the private data to set | |
208 | * | |
82e9bae6 | 209 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
210 | * template. When the access field of ncontrol is 0, it's assumed as |
211 | * READWRITE access. When the count field is 0, it's assumes as one. | |
212 | * | |
213 | * Returns the pointer of the newly generated instance, or NULL on failure. | |
214 | */ | |
82e9bae6 TI |
215 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
216 | void *private_data) | |
1da177e4 | 217 | { |
82e9bae6 | 218 | struct snd_kcontrol kctl; |
1da177e4 LT |
219 | unsigned int access; |
220 | ||
7eaa943c TI |
221 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
222 | return NULL; | |
1da177e4 LT |
223 | memset(&kctl, 0, sizeof(kctl)); |
224 | kctl.id.iface = ncontrol->iface; | |
225 | kctl.id.device = ncontrol->device; | |
226 | kctl.id.subdevice = ncontrol->subdevice; | |
366840d7 | 227 | if (ncontrol->name) { |
1da177e4 | 228 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
366840d7 MB |
229 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
230 | snd_printk(KERN_WARNING | |
231 | "Control name '%s' truncated to '%s'\n", | |
232 | ncontrol->name, kctl.id.name); | |
233 | } | |
1da177e4 LT |
234 | kctl.id.index = ncontrol->index; |
235 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
236 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 JK |
237 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
238 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| | |
8aa9b586 JK |
239 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
240 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
241 | kctl.info = ncontrol->info; |
242 | kctl.get = ncontrol->get; | |
243 | kctl.put = ncontrol->put; | |
8aa9b586 | 244 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
245 | kctl.private_value = ncontrol->private_value; |
246 | kctl.private_data = private_data; | |
247 | return snd_ctl_new(&kctl, access); | |
248 | } | |
249 | ||
c0d3fb39 TI |
250 | EXPORT_SYMBOL(snd_ctl_new1); |
251 | ||
1da177e4 LT |
252 | /** |
253 | * snd_ctl_free_one - release the control instance | |
254 | * @kcontrol: the control instance | |
255 | * | |
256 | * Releases the control instance created via snd_ctl_new() | |
257 | * or snd_ctl_new1(). | |
258 | * Don't call this after the control was added to the card. | |
259 | */ | |
82e9bae6 | 260 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
261 | { |
262 | if (kcontrol) { | |
263 | if (kcontrol->private_free) | |
264 | kcontrol->private_free(kcontrol); | |
265 | kfree(kcontrol); | |
266 | } | |
267 | } | |
268 | ||
c0d3fb39 TI |
269 | EXPORT_SYMBOL(snd_ctl_free_one); |
270 | ||
82e9bae6 | 271 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
1da177e4 LT |
272 | unsigned int count) |
273 | { | |
82e9bae6 | 274 | struct snd_kcontrol *kctl; |
1da177e4 | 275 | |
9244b2c3 | 276 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
277 | if ((kctl->id.numid <= card->last_numid && |
278 | kctl->id.numid + kctl->count > card->last_numid) || | |
279 | (kctl->id.numid <= card->last_numid + count - 1 && | |
280 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) | |
281 | return card->last_numid = kctl->id.numid + kctl->count - 1; | |
282 | } | |
283 | return card->last_numid; | |
284 | } | |
285 | ||
82e9bae6 | 286 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 LT |
287 | { |
288 | unsigned int last_numid, iter = 100000; | |
289 | ||
290 | last_numid = card->last_numid; | |
291 | while (last_numid != snd_ctl_hole_check(card, count)) { | |
292 | if (--iter == 0) { | |
293 | /* this situation is very unlikely */ | |
294 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
295 | return -ENOMEM; | |
296 | } | |
297 | last_numid = card->last_numid; | |
298 | } | |
299 | return 0; | |
300 | } | |
301 | ||
302 | /** | |
303 | * snd_ctl_add - add the control instance to the card | |
304 | * @card: the card instance | |
305 | * @kcontrol: the control instance to add | |
306 | * | |
307 | * Adds the control instance created via snd_ctl_new() or | |
308 | * snd_ctl_new1() to the given card. Assigns also an unique | |
309 | * numid used for fast search. | |
310 | * | |
311 | * Returns zero if successful, or a negative error code on failure. | |
312 | * | |
313 | * It frees automatically the control which cannot be added. | |
314 | */ | |
82e9bae6 | 315 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 316 | { |
82e9bae6 | 317 | struct snd_ctl_elem_id id; |
1da177e4 | 318 | unsigned int idx; |
c6077b30 | 319 | int err = -EINVAL; |
1da177e4 | 320 | |
73e77ba0 | 321 | if (! kcontrol) |
c6077b30 | 322 | return err; |
7eaa943c TI |
323 | if (snd_BUG_ON(!card || !kcontrol->info)) |
324 | goto error; | |
1da177e4 LT |
325 | id = kcontrol->id; |
326 | down_write(&card->controls_rwsem); | |
327 | if (snd_ctl_find_id(card, &id)) { | |
328 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
329 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
330 | id.iface, | |
331 | id.device, | |
332 | id.subdevice, | |
333 | id.name, | |
334 | id.index); | |
c6077b30 TI |
335 | err = -EBUSY; |
336 | goto error; | |
1da177e4 LT |
337 | } |
338 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
339 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
340 | err = -ENOMEM; |
341 | goto error; | |
1da177e4 LT |
342 | } |
343 | list_add_tail(&kcontrol->list, &card->controls); | |
344 | card->controls_count += kcontrol->count; | |
345 | kcontrol->id.numid = card->last_numid + 1; | |
346 | card->last_numid += kcontrol->count; | |
347 | up_write(&card->controls_rwsem); | |
348 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
349 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
350 | return 0; | |
c6077b30 TI |
351 | |
352 | error: | |
353 | snd_ctl_free_one(kcontrol); | |
354 | return err; | |
1da177e4 LT |
355 | } |
356 | ||
c0d3fb39 TI |
357 | EXPORT_SYMBOL(snd_ctl_add); |
358 | ||
1da177e4 LT |
359 | /** |
360 | * snd_ctl_remove - remove the control from the card and release it | |
361 | * @card: the card instance | |
362 | * @kcontrol: the control instance to remove | |
363 | * | |
364 | * Removes the control from the card and then releases the instance. | |
365 | * You don't need to call snd_ctl_free_one(). You must be in | |
366 | * the write lock - down_write(&card->controls_rwsem). | |
367 | * | |
368 | * Returns 0 if successful, or a negative error code on failure. | |
369 | */ | |
82e9bae6 | 370 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 371 | { |
82e9bae6 | 372 | struct snd_ctl_elem_id id; |
1da177e4 LT |
373 | unsigned int idx; |
374 | ||
7eaa943c TI |
375 | if (snd_BUG_ON(!card || !kcontrol)) |
376 | return -EINVAL; | |
1da177e4 LT |
377 | list_del(&kcontrol->list); |
378 | card->controls_count -= kcontrol->count; | |
379 | id = kcontrol->id; | |
380 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
381 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
382 | snd_ctl_free_one(kcontrol); | |
383 | return 0; | |
384 | } | |
385 | ||
c0d3fb39 TI |
386 | EXPORT_SYMBOL(snd_ctl_remove); |
387 | ||
1da177e4 LT |
388 | /** |
389 | * snd_ctl_remove_id - remove the control of the given id and release it | |
390 | * @card: the card instance | |
391 | * @id: the control id to remove | |
392 | * | |
393 | * Finds the control instance with the given id, removes it from the | |
394 | * card list and releases it. | |
395 | * | |
396 | * Returns 0 if successful, or a negative error code on failure. | |
397 | */ | |
82e9bae6 | 398 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 399 | { |
82e9bae6 | 400 | struct snd_kcontrol *kctl; |
1da177e4 LT |
401 | int ret; |
402 | ||
403 | down_write(&card->controls_rwsem); | |
404 | kctl = snd_ctl_find_id(card, id); | |
405 | if (kctl == NULL) { | |
406 | up_write(&card->controls_rwsem); | |
407 | return -ENOENT; | |
408 | } | |
409 | ret = snd_ctl_remove(card, kctl); | |
410 | up_write(&card->controls_rwsem); | |
411 | return ret; | |
412 | } | |
413 | ||
c0d3fb39 TI |
414 | EXPORT_SYMBOL(snd_ctl_remove_id); |
415 | ||
1da177e4 LT |
416 | /** |
417 | * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it | |
418 | * @file: active control handle | |
419 | * @id: the control id to remove | |
420 | * | |
421 | * Finds the control instance with the given id, removes it from the | |
422 | * card list and releases it. | |
423 | * | |
424 | * Returns 0 if successful, or a negative error code on failure. | |
425 | */ | |
82e9bae6 TI |
426 | static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file, |
427 | struct snd_ctl_elem_id *id) | |
1da177e4 | 428 | { |
82e9bae6 TI |
429 | struct snd_card *card = file->card; |
430 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
431 | int idx, ret; |
432 | ||
433 | down_write(&card->controls_rwsem); | |
434 | kctl = snd_ctl_find_id(card, id); | |
435 | if (kctl == NULL) { | |
436 | up_write(&card->controls_rwsem); | |
437 | return -ENOENT; | |
438 | } | |
439 | for (idx = 0; idx < kctl->count; idx++) | |
440 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
441 | up_write(&card->controls_rwsem); | |
442 | return -EBUSY; | |
443 | } | |
444 | ret = snd_ctl_remove(card, kctl); | |
445 | up_write(&card->controls_rwsem); | |
446 | return ret; | |
447 | } | |
448 | ||
449 | /** | |
450 | * snd_ctl_rename_id - replace the id of a control on the card | |
451 | * @card: the card instance | |
452 | * @src_id: the old id | |
453 | * @dst_id: the new id | |
454 | * | |
455 | * Finds the control with the old id from the card, and replaces the | |
456 | * id with the new one. | |
457 | * | |
458 | * Returns zero if successful, or a negative error code on failure. | |
459 | */ | |
82e9bae6 TI |
460 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
461 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 462 | { |
82e9bae6 | 463 | struct snd_kcontrol *kctl; |
1da177e4 LT |
464 | |
465 | down_write(&card->controls_rwsem); | |
466 | kctl = snd_ctl_find_id(card, src_id); | |
467 | if (kctl == NULL) { | |
468 | up_write(&card->controls_rwsem); | |
469 | return -ENOENT; | |
470 | } | |
471 | kctl->id = *dst_id; | |
472 | kctl->id.numid = card->last_numid + 1; | |
473 | card->last_numid += kctl->count; | |
474 | up_write(&card->controls_rwsem); | |
475 | return 0; | |
476 | } | |
477 | ||
c0d3fb39 TI |
478 | EXPORT_SYMBOL(snd_ctl_rename_id); |
479 | ||
1da177e4 LT |
480 | /** |
481 | * snd_ctl_find_numid - find the control instance with the given number-id | |
482 | * @card: the card instance | |
483 | * @numid: the number-id to search | |
484 | * | |
485 | * Finds the control instance with the given number-id from the card. | |
486 | * | |
487 | * Returns the pointer of the instance if found, or NULL if not. | |
488 | * | |
489 | * The caller must down card->controls_rwsem before calling this function | |
490 | * (if the race condition can happen). | |
491 | */ | |
82e9bae6 | 492 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 493 | { |
82e9bae6 | 494 | struct snd_kcontrol *kctl; |
1da177e4 | 495 | |
7eaa943c TI |
496 | if (snd_BUG_ON(!card || !numid)) |
497 | return NULL; | |
9244b2c3 | 498 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
499 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
500 | return kctl; | |
501 | } | |
502 | return NULL; | |
503 | } | |
504 | ||
c0d3fb39 TI |
505 | EXPORT_SYMBOL(snd_ctl_find_numid); |
506 | ||
1da177e4 LT |
507 | /** |
508 | * snd_ctl_find_id - find the control instance with the given id | |
509 | * @card: the card instance | |
510 | * @id: the id to search | |
511 | * | |
512 | * Finds the control instance with the given id from the card. | |
513 | * | |
514 | * Returns the pointer of the instance if found, or NULL if not. | |
515 | * | |
516 | * The caller must down card->controls_rwsem before calling this function | |
517 | * (if the race condition can happen). | |
518 | */ | |
82e9bae6 TI |
519 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
520 | struct snd_ctl_elem_id *id) | |
1da177e4 | 521 | { |
82e9bae6 | 522 | struct snd_kcontrol *kctl; |
1da177e4 | 523 | |
7eaa943c TI |
524 | if (snd_BUG_ON(!card || !id)) |
525 | return NULL; | |
1da177e4 LT |
526 | if (id->numid != 0) |
527 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 528 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
529 | if (kctl->id.iface != id->iface) |
530 | continue; | |
531 | if (kctl->id.device != id->device) | |
532 | continue; | |
533 | if (kctl->id.subdevice != id->subdevice) | |
534 | continue; | |
535 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
536 | continue; | |
537 | if (kctl->id.index > id->index) | |
538 | continue; | |
539 | if (kctl->id.index + kctl->count <= id->index) | |
540 | continue; | |
541 | return kctl; | |
542 | } | |
543 | return NULL; | |
544 | } | |
545 | ||
c0d3fb39 TI |
546 | EXPORT_SYMBOL(snd_ctl_find_id); |
547 | ||
82e9bae6 | 548 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
549 | unsigned int cmd, void __user *arg) |
550 | { | |
82e9bae6 | 551 | struct snd_ctl_card_info *info; |
1da177e4 | 552 | |
ca2c0966 | 553 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
554 | if (! info) |
555 | return -ENOMEM; | |
556 | down_read(&snd_ioctl_rwsem); | |
557 | info->card = card->number; | |
558 | strlcpy(info->id, card->id, sizeof(info->id)); | |
559 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
560 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
561 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
562 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
563 | strlcpy(info->components, card->components, sizeof(info->components)); | |
564 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 565 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
566 | kfree(info); |
567 | return -EFAULT; | |
568 | } | |
569 | kfree(info); | |
570 | return 0; | |
571 | } | |
572 | ||
82e9bae6 TI |
573 | static int snd_ctl_elem_list(struct snd_card *card, |
574 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
575 | { |
576 | struct list_head *plist; | |
82e9bae6 TI |
577 | struct snd_ctl_elem_list list; |
578 | struct snd_kcontrol *kctl; | |
579 | struct snd_ctl_elem_id *dst, *id; | |
1da177e4 LT |
580 | unsigned int offset, space, first, jidx; |
581 | ||
582 | if (copy_from_user(&list, _list, sizeof(list))) | |
583 | return -EFAULT; | |
584 | offset = list.offset; | |
585 | space = list.space; | |
586 | first = 0; | |
587 | /* try limit maximum space */ | |
588 | if (space > 16384) | |
589 | return -ENOMEM; | |
590 | if (space > 0) { | |
591 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 592 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
593 | if (dst == NULL) |
594 | return -ENOMEM; | |
595 | down_read(&card->controls_rwsem); | |
596 | list.count = card->controls_count; | |
597 | plist = card->controls.next; | |
598 | while (plist != &card->controls) { | |
599 | if (offset == 0) | |
600 | break; | |
601 | kctl = snd_kcontrol(plist); | |
602 | if (offset < kctl->count) | |
603 | break; | |
604 | offset -= kctl->count; | |
605 | plist = plist->next; | |
606 | } | |
607 | list.used = 0; | |
608 | id = dst; | |
609 | while (space > 0 && plist != &card->controls) { | |
610 | kctl = snd_kcontrol(plist); | |
611 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
612 | snd_ctl_build_ioff(id, kctl, jidx); | |
613 | id++; | |
614 | space--; | |
615 | list.used++; | |
616 | } | |
617 | plist = plist->next; | |
618 | offset = 0; | |
619 | } | |
620 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
621 | if (list.used > 0 && |
622 | copy_to_user(list.pids, dst, | |
623 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
624 | vfree(dst); |
625 | return -EFAULT; | |
626 | } | |
627 | vfree(dst); | |
628 | } else { | |
629 | down_read(&card->controls_rwsem); | |
630 | list.count = card->controls_count; | |
631 | up_read(&card->controls_rwsem); | |
632 | } | |
633 | if (copy_to_user(_list, &list, sizeof(list))) | |
634 | return -EFAULT; | |
635 | return 0; | |
636 | } | |
637 | ||
82e9bae6 TI |
638 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
639 | struct snd_ctl_elem_info *info) | |
1da177e4 | 640 | { |
82e9bae6 TI |
641 | struct snd_card *card = ctl->card; |
642 | struct snd_kcontrol *kctl; | |
643 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
644 | unsigned int index_offset; |
645 | int result; | |
646 | ||
647 | down_read(&card->controls_rwsem); | |
648 | kctl = snd_ctl_find_id(card, &info->id); | |
649 | if (kctl == NULL) { | |
650 | up_read(&card->controls_rwsem); | |
651 | return -ENOENT; | |
652 | } | |
653 | #ifdef CONFIG_SND_DEBUG | |
654 | info->access = 0; | |
655 | #endif | |
656 | result = kctl->info(kctl, info); | |
657 | if (result >= 0) { | |
7eaa943c | 658 | snd_BUG_ON(info->access); |
1da177e4 LT |
659 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
660 | vd = &kctl->vd[index_offset]; | |
661 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
662 | info->access = vd->access; | |
663 | if (vd->owner) { | |
664 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
665 | if (vd->owner == ctl) | |
666 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
667 | info->owner = vd->owner_pid; | |
668 | } else { | |
669 | info->owner = -1; | |
670 | } | |
671 | } | |
672 | up_read(&card->controls_rwsem); | |
673 | return result; | |
674 | } | |
675 | ||
82e9bae6 TI |
676 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
677 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 678 | { |
82e9bae6 | 679 | struct snd_ctl_elem_info info; |
1da177e4 LT |
680 | int result; |
681 | ||
682 | if (copy_from_user(&info, _info, sizeof(info))) | |
683 | return -EFAULT; | |
64649400 | 684 | snd_power_lock(ctl->card); |
cbac4b0c | 685 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
686 | if (result >= 0) |
687 | result = snd_ctl_elem_info(ctl, &info); | |
688 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
689 | if (result >= 0) |
690 | if (copy_to_user(_info, &info, sizeof(info))) | |
691 | return -EFAULT; | |
692 | return result; | |
693 | } | |
694 | ||
d3bd67cd TI |
695 | static int snd_ctl_elem_read(struct snd_card *card, |
696 | struct snd_ctl_elem_value *control) | |
1da177e4 | 697 | { |
82e9bae6 TI |
698 | struct snd_kcontrol *kctl; |
699 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 700 | unsigned int index_offset; |
8ace4f3c | 701 | int result; |
1da177e4 LT |
702 | |
703 | down_read(&card->controls_rwsem); | |
704 | kctl = snd_ctl_find_id(card, &control->id); | |
705 | if (kctl == NULL) { | |
706 | result = -ENOENT; | |
707 | } else { | |
708 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
709 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
710 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
711 | kctl->get != NULL) { | |
712 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
713 | result = kctl->get(kctl, control); | |
714 | } else | |
715 | result = -EPERM; | |
1da177e4 LT |
716 | } |
717 | up_read(&card->controls_rwsem); | |
718 | return result; | |
719 | } | |
720 | ||
82e9bae6 TI |
721 | static int snd_ctl_elem_read_user(struct snd_card *card, |
722 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 723 | { |
82e9bae6 | 724 | struct snd_ctl_elem_value *control; |
1da177e4 LT |
725 | int result; |
726 | ||
727 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
728 | if (control == NULL) | |
729 | return -ENOMEM; | |
730 | if (copy_from_user(control, _control, sizeof(*control))) { | |
731 | kfree(control); | |
732 | return -EFAULT; | |
733 | } | |
64649400 | 734 | snd_power_lock(card); |
cbac4b0c | 735 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
736 | if (result >= 0) |
737 | result = snd_ctl_elem_read(card, control); | |
738 | snd_power_unlock(card); | |
1da177e4 LT |
739 | if (result >= 0) |
740 | if (copy_to_user(_control, control, sizeof(*control))) | |
741 | result = -EFAULT; | |
742 | kfree(control); | |
743 | return result; | |
744 | } | |
745 | ||
d3bd67cd TI |
746 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
747 | struct snd_ctl_elem_value *control) | |
1da177e4 | 748 | { |
82e9bae6 TI |
749 | struct snd_kcontrol *kctl; |
750 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 751 | unsigned int index_offset; |
8ace4f3c | 752 | int result; |
1da177e4 LT |
753 | |
754 | down_read(&card->controls_rwsem); | |
755 | kctl = snd_ctl_find_id(card, &control->id); | |
756 | if (kctl == NULL) { | |
757 | result = -ENOENT; | |
758 | } else { | |
759 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
760 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
761 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
762 | kctl->put == NULL || | |
763 | (file && vd->owner && vd->owner != file)) { | |
764 | result = -EPERM; | |
1da177e4 | 765 | } else { |
8ace4f3c TI |
766 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
767 | result = kctl->put(kctl, control); | |
768 | } | |
769 | if (result > 0) { | |
770 | up_read(&card->controls_rwsem); | |
771 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
772 | &control->id); | |
773 | return 0; | |
1da177e4 LT |
774 | } |
775 | } | |
776 | up_read(&card->controls_rwsem); | |
777 | return result; | |
778 | } | |
779 | ||
82e9bae6 TI |
780 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
781 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 782 | { |
82e9bae6 | 783 | struct snd_ctl_elem_value *control; |
64649400 | 784 | struct snd_card *card; |
1da177e4 LT |
785 | int result; |
786 | ||
787 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
788 | if (control == NULL) | |
789 | return -ENOMEM; | |
790 | if (copy_from_user(control, _control, sizeof(*control))) { | |
791 | kfree(control); | |
792 | return -EFAULT; | |
793 | } | |
64649400 GP |
794 | card = file->card; |
795 | snd_power_lock(card); | |
cbac4b0c | 796 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
797 | if (result >= 0) |
798 | result = snd_ctl_elem_write(card, file, control); | |
799 | snd_power_unlock(card); | |
1da177e4 LT |
800 | if (result >= 0) |
801 | if (copy_to_user(_control, control, sizeof(*control))) | |
802 | result = -EFAULT; | |
803 | kfree(control); | |
804 | return result; | |
805 | } | |
806 | ||
82e9bae6 TI |
807 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
808 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 809 | { |
82e9bae6 TI |
810 | struct snd_card *card = file->card; |
811 | struct snd_ctl_elem_id id; | |
812 | struct snd_kcontrol *kctl; | |
813 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
814 | int result; |
815 | ||
816 | if (copy_from_user(&id, _id, sizeof(id))) | |
817 | return -EFAULT; | |
818 | down_write(&card->controls_rwsem); | |
819 | kctl = snd_ctl_find_id(card, &id); | |
820 | if (kctl == NULL) { | |
821 | result = -ENOENT; | |
822 | } else { | |
823 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
824 | if (vd->owner != NULL) | |
825 | result = -EBUSY; | |
826 | else { | |
827 | vd->owner = file; | |
828 | vd->owner_pid = current->pid; | |
829 | result = 0; | |
830 | } | |
831 | } | |
832 | up_write(&card->controls_rwsem); | |
833 | return result; | |
834 | } | |
835 | ||
82e9bae6 TI |
836 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
837 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 838 | { |
82e9bae6 TI |
839 | struct snd_card *card = file->card; |
840 | struct snd_ctl_elem_id id; | |
841 | struct snd_kcontrol *kctl; | |
842 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
843 | int result; |
844 | ||
845 | if (copy_from_user(&id, _id, sizeof(id))) | |
846 | return -EFAULT; | |
847 | down_write(&card->controls_rwsem); | |
848 | kctl = snd_ctl_find_id(card, &id); | |
849 | if (kctl == NULL) { | |
850 | result = -ENOENT; | |
851 | } else { | |
852 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
853 | if (vd->owner == NULL) | |
854 | result = -EINVAL; | |
855 | else if (vd->owner != file) | |
856 | result = -EPERM; | |
857 | else { | |
858 | vd->owner = NULL; | |
859 | vd->owner_pid = 0; | |
860 | result = 0; | |
861 | } | |
862 | } | |
863 | up_write(&card->controls_rwsem); | |
864 | return result; | |
865 | } | |
866 | ||
867 | struct user_element { | |
82e9bae6 | 868 | struct snd_ctl_elem_info info; |
1da177e4 LT |
869 | void *elem_data; /* element data */ |
870 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
871 | void *tlv_data; /* TLV data */ |
872 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 LT |
873 | void *priv_data; /* private data (like strings for enumerated type) */ |
874 | unsigned long priv_data_size; /* size of private data in bytes */ | |
875 | }; | |
876 | ||
82e9bae6 TI |
877 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
878 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
879 | { |
880 | struct user_element *ue = kcontrol->private_data; | |
881 | ||
882 | *uinfo = ue->info; | |
883 | return 0; | |
884 | } | |
885 | ||
82e9bae6 TI |
886 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
887 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
888 | { |
889 | struct user_element *ue = kcontrol->private_data; | |
890 | ||
891 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
892 | return 0; | |
893 | } | |
894 | ||
82e9bae6 TI |
895 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
896 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
897 | { |
898 | int change; | |
899 | struct user_element *ue = kcontrol->private_data; | |
900 | ||
901 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
902 | if (change) | |
903 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
904 | return change; | |
905 | } | |
906 | ||
8aa9b586 JK |
907 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
908 | int op_flag, | |
909 | unsigned int size, | |
910 | unsigned int __user *tlv) | |
911 | { | |
912 | struct user_element *ue = kcontrol->private_data; | |
913 | int change = 0; | |
914 | void *new_data; | |
915 | ||
916 | if (op_flag > 0) { | |
917 | if (size > 1024 * 128) /* sane value */ | |
918 | return -EINVAL; | |
919 | new_data = kmalloc(size, GFP_KERNEL); | |
920 | if (new_data == NULL) | |
921 | return -ENOMEM; | |
922 | if (copy_from_user(new_data, tlv, size)) { | |
923 | kfree(new_data); | |
924 | return -EFAULT; | |
925 | } | |
926 | change = ue->tlv_data_size != size; | |
927 | if (!change) | |
928 | change = memcmp(ue->tlv_data, new_data, size); | |
929 | kfree(ue->tlv_data); | |
930 | ue->tlv_data = new_data; | |
931 | ue->tlv_data_size = size; | |
932 | } else { | |
18c1c3f6 TI |
933 | if (! ue->tlv_data_size || ! ue->tlv_data) |
934 | return -ENXIO; | |
8aa9b586 JK |
935 | if (size < ue->tlv_data_size) |
936 | return -ENOSPC; | |
937 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) | |
938 | return -EFAULT; | |
939 | } | |
940 | return change; | |
941 | } | |
942 | ||
82e9bae6 | 943 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 944 | { |
8aa9b586 JK |
945 | struct user_element *ue = kcontrol->private_data; |
946 | if (ue->tlv_data) | |
947 | kfree(ue->tlv_data); | |
948 | kfree(ue); | |
1da177e4 LT |
949 | } |
950 | ||
82e9bae6 TI |
951 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
952 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 953 | { |
82e9bae6 TI |
954 | struct snd_card *card = file->card; |
955 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
956 | unsigned int access; |
957 | long private_size; | |
958 | struct user_element *ue; | |
959 | int idx, err; | |
960 | ||
961 | if (card->user_ctl_count >= MAX_USER_CONTROLS) | |
962 | return -ENOMEM; | |
963 | if (info->count > 1024) | |
964 | return -EINVAL; | |
965 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 966 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
967 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
968 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
969 | info->id.numid = 0; |
970 | memset(&kctl, 0, sizeof(kctl)); | |
971 | down_write(&card->controls_rwsem); | |
972 | _kctl = snd_ctl_find_id(card, &info->id); | |
973 | err = 0; | |
974 | if (_kctl) { | |
975 | if (replace) | |
976 | err = snd_ctl_remove(card, _kctl); | |
977 | else | |
978 | err = -EBUSY; | |
979 | } else { | |
980 | if (replace) | |
981 | err = -ENOENT; | |
982 | } | |
983 | up_write(&card->controls_rwsem); | |
984 | if (err < 0) | |
985 | return err; | |
986 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
987 | kctl.count = info->owner ? info->owner : 1; | |
988 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
989 | kctl.info = snd_ctl_elem_user_info; | |
990 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
991 | kctl.get = snd_ctl_elem_user_get; | |
992 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
993 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
994 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
995 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
996 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
997 | } | |
1da177e4 LT |
998 | switch (info->type) { |
999 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
1000 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1001 | private_size = sizeof(long); | |
1002 | if (info->count > 128) | |
1003 | return -EINVAL; | |
1004 | break; | |
1005 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
1006 | private_size = sizeof(long long); | |
1007 | if (info->count > 64) | |
1008 | return -EINVAL; | |
1009 | break; | |
1010 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
1011 | private_size = sizeof(unsigned char); | |
1012 | if (info->count > 512) | |
1013 | return -EINVAL; | |
1014 | break; | |
1015 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1016 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1017 | if (info->count != 1) |
1018 | return -EINVAL; | |
1019 | break; | |
1020 | default: | |
1021 | return -EINVAL; | |
1022 | } | |
1023 | private_size *= info->count; | |
ca2c0966 | 1024 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1025 | if (ue == NULL) |
1026 | return -ENOMEM; | |
1027 | ue->info = *info; | |
86148e84 | 1028 | ue->info.access = 0; |
1da177e4 LT |
1029 | ue->elem_data = (char *)ue + sizeof(*ue); |
1030 | ue->elem_data_size = private_size; | |
1031 | kctl.private_free = snd_ctl_elem_user_free; | |
1032 | _kctl = snd_ctl_new(&kctl, access); | |
1033 | if (_kctl == NULL) { | |
2fbf182e | 1034 | kfree(ue); |
1da177e4 LT |
1035 | return -ENOMEM; |
1036 | } | |
1037 | _kctl->private_data = ue; | |
1038 | for (idx = 0; idx < _kctl->count; idx++) | |
1039 | _kctl->vd[idx].owner = file; | |
1040 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1041 | if (err < 0) |
1da177e4 | 1042 | return err; |
1da177e4 LT |
1043 | |
1044 | down_write(&card->controls_rwsem); | |
1045 | card->user_ctl_count++; | |
1046 | up_write(&card->controls_rwsem); | |
1047 | ||
1048 | return 0; | |
1049 | } | |
1050 | ||
82e9bae6 TI |
1051 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1052 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1053 | { |
82e9bae6 | 1054 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1055 | if (copy_from_user(&info, _info, sizeof(info))) |
1056 | return -EFAULT; | |
1057 | return snd_ctl_elem_add(file, &info, replace); | |
1058 | } | |
1059 | ||
82e9bae6 TI |
1060 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1061 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1062 | { |
82e9bae6 | 1063 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1064 | int err; |
1065 | ||
1066 | if (copy_from_user(&id, _id, sizeof(id))) | |
1067 | return -EFAULT; | |
1068 | err = snd_ctl_remove_unlocked_id(file, &id); | |
1069 | if (! err) { | |
82e9bae6 | 1070 | struct snd_card *card = file->card; |
1da177e4 LT |
1071 | down_write(&card->controls_rwsem); |
1072 | card->user_ctl_count--; | |
1073 | up_write(&card->controls_rwsem); | |
1074 | } | |
1075 | return err; | |
1076 | } | |
1077 | ||
82e9bae6 | 1078 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1079 | { |
1080 | int subscribe; | |
1081 | if (get_user(subscribe, ptr)) | |
1082 | return -EFAULT; | |
1083 | if (subscribe < 0) { | |
1084 | subscribe = file->subscribed; | |
1085 | if (put_user(subscribe, ptr)) | |
1086 | return -EFAULT; | |
1087 | return 0; | |
1088 | } | |
1089 | if (subscribe) { | |
1090 | file->subscribed = 1; | |
1091 | return 0; | |
1092 | } else if (file->subscribed) { | |
1093 | snd_ctl_empty_read_queue(file); | |
1094 | file->subscribed = 0; | |
1095 | } | |
1096 | return 0; | |
1097 | } | |
1098 | ||
8aa9b586 JK |
1099 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1100 | struct snd_ctl_tlv __user *_tlv, | |
1101 | int op_flag) | |
42750b04 | 1102 | { |
8aa9b586 | 1103 | struct snd_card *card = file->card; |
42750b04 JK |
1104 | struct snd_ctl_tlv tlv; |
1105 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1106 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1107 | unsigned int len; |
1108 | int err = 0; | |
1109 | ||
1110 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1111 | return -EFAULT; | |
8aa9b586 JK |
1112 | if (tlv.length < sizeof(unsigned int) * 3) |
1113 | return -EINVAL; | |
1114 | down_read(&card->controls_rwsem); | |
1115 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1116 | if (kctl == NULL) { | |
1117 | err = -ENOENT; | |
1118 | goto __kctl_end; | |
1119 | } | |
1120 | if (kctl->tlv.p == NULL) { | |
1121 | err = -ENXIO; | |
1122 | goto __kctl_end; | |
1123 | } | |
1124 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1125 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1126 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1127 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1128 | err = -ENXIO; | |
1129 | goto __kctl_end; | |
1130 | } | |
1131 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
1132 | if (file && vd->owner != NULL && vd->owner != file) { | |
1133 | err = -EPERM; | |
1134 | goto __kctl_end; | |
1135 | } | |
1136 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); | |
1137 | if (err > 0) { | |
1138 | up_read(&card->controls_rwsem); | |
1139 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1140 | return 0; | |
1141 | } | |
1142 | } else { | |
1143 | if (op_flag) { | |
1144 | err = -ENXIO; | |
1145 | goto __kctl_end; | |
1146 | } | |
1147 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1148 | if (tlv.length < len) { | |
1149 | err = -ENOMEM; | |
1150 | goto __kctl_end; | |
1151 | } | |
1152 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1153 | err = -EFAULT; | |
1154 | } | |
42750b04 | 1155 | __kctl_end: |
8aa9b586 JK |
1156 | up_read(&card->controls_rwsem); |
1157 | return err; | |
42750b04 JK |
1158 | } |
1159 | ||
1da177e4 LT |
1160 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1161 | { | |
82e9bae6 TI |
1162 | struct snd_ctl_file *ctl; |
1163 | struct snd_card *card; | |
82e9bae6 | 1164 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1165 | void __user *argp = (void __user *)arg; |
1166 | int __user *ip = argp; | |
1167 | int err; | |
1168 | ||
1169 | ctl = file->private_data; | |
1170 | card = ctl->card; | |
7eaa943c TI |
1171 | if (snd_BUG_ON(!card)) |
1172 | return -ENXIO; | |
1da177e4 LT |
1173 | switch (cmd) { |
1174 | case SNDRV_CTL_IOCTL_PVERSION: | |
1175 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1176 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1177 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1178 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1179 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1180 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1181 | return snd_ctl_elem_info_user(ctl, argp); | |
1182 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1183 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1184 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1185 | return snd_ctl_elem_write_user(ctl, argp); | |
1186 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1187 | return snd_ctl_elem_lock(ctl, argp); | |
1188 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1189 | return snd_ctl_elem_unlock(ctl, argp); | |
1190 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1191 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1192 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1193 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1194 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1195 | return snd_ctl_elem_remove(ctl, argp); | |
1196 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1197 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 JK |
1198 | case SNDRV_CTL_IOCTL_TLV_READ: |
1199 | return snd_ctl_tlv_ioctl(ctl, argp, 0); | |
1200 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
1201 | return snd_ctl_tlv_ioctl(ctl, argp, 1); | |
1202 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1203 | return snd_ctl_tlv_ioctl(ctl, argp, -1); | |
1da177e4 | 1204 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1205 | return -ENOPROTOOPT; |
1da177e4 LT |
1206 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1207 | #ifdef CONFIG_PM | |
1208 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1209 | #else | |
1210 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1211 | #endif | |
1212 | } | |
1213 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1214 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1215 | err = p->fioctl(card, ctl, cmd, arg); |
1216 | if (err != -ENOIOCTLCMD) { | |
1217 | up_read(&snd_ioctl_rwsem); | |
1218 | return err; | |
1219 | } | |
1220 | } | |
1221 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1222 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1223 | return -ENOTTY; |
1224 | } | |
1225 | ||
82e9bae6 TI |
1226 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1227 | size_t count, loff_t * offset) | |
1da177e4 | 1228 | { |
82e9bae6 | 1229 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1230 | int err = 0; |
1231 | ssize_t result = 0; | |
1232 | ||
1233 | ctl = file->private_data; | |
7eaa943c TI |
1234 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1235 | return -ENXIO; | |
1da177e4 LT |
1236 | if (!ctl->subscribed) |
1237 | return -EBADFD; | |
82e9bae6 | 1238 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1239 | return -EINVAL; |
1240 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1241 | while (count >= sizeof(struct snd_ctl_event)) { |
1242 | struct snd_ctl_event ev; | |
1243 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1244 | while (list_empty(&ctl->events)) { |
1245 | wait_queue_t wait; | |
1246 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1247 | err = -EAGAIN; | |
1248 | goto __end_lock; | |
1249 | } | |
1250 | init_waitqueue_entry(&wait, current); | |
1251 | add_wait_queue(&ctl->change_sleep, &wait); | |
1252 | set_current_state(TASK_INTERRUPTIBLE); | |
1253 | spin_unlock_irq(&ctl->read_lock); | |
1254 | schedule(); | |
1255 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1256 | if (signal_pending(current)) | |
0e5d720c | 1257 | return -ERESTARTSYS; |
1da177e4 LT |
1258 | spin_lock_irq(&ctl->read_lock); |
1259 | } | |
1260 | kev = snd_kctl_event(ctl->events.next); | |
1261 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1262 | ev.data.elem.mask = kev->mask; | |
1263 | ev.data.elem.id = kev->id; | |
1264 | list_del(&kev->list); | |
1265 | spin_unlock_irq(&ctl->read_lock); | |
1266 | kfree(kev); | |
82e9bae6 | 1267 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1268 | err = -EFAULT; |
1269 | goto __end; | |
1270 | } | |
1271 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1272 | buffer += sizeof(struct snd_ctl_event); |
1273 | count -= sizeof(struct snd_ctl_event); | |
1274 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1275 | } |
1276 | __end_lock: | |
1277 | spin_unlock_irq(&ctl->read_lock); | |
1278 | __end: | |
1279 | return result > 0 ? result : err; | |
1280 | } | |
1281 | ||
1282 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1283 | { | |
1284 | unsigned int mask; | |
82e9bae6 | 1285 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1286 | |
1287 | ctl = file->private_data; | |
1288 | if (!ctl->subscribed) | |
1289 | return 0; | |
1290 | poll_wait(file, &ctl->change_sleep, wait); | |
1291 | ||
1292 | mask = 0; | |
1293 | if (!list_empty(&ctl->events)) | |
1294 | mask |= POLLIN | POLLRDNORM; | |
1295 | ||
1296 | return mask; | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * register the device-specific control-ioctls. | |
1301 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1302 | */ | |
1303 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1304 | { | |
82e9bae6 | 1305 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1306 | |
82e9bae6 | 1307 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1308 | if (pn == NULL) |
1309 | return -ENOMEM; | |
1310 | pn->fioctl = fcn; | |
1311 | down_write(&snd_ioctl_rwsem); | |
1312 | list_add_tail(&pn->list, lists); | |
1313 | up_write(&snd_ioctl_rwsem); | |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1318 | { | |
1319 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1320 | } | |
1321 | ||
c0d3fb39 TI |
1322 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1323 | ||
1da177e4 LT |
1324 | #ifdef CONFIG_COMPAT |
1325 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1326 | { | |
1327 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1328 | } | |
c0d3fb39 TI |
1329 | |
1330 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1331 | #endif |
1332 | ||
1333 | /* | |
1334 | * de-register the device-specific control-ioctls. | |
1335 | */ | |
82e9bae6 TI |
1336 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1337 | struct list_head *lists) | |
1da177e4 | 1338 | { |
82e9bae6 | 1339 | struct snd_kctl_ioctl *p; |
1da177e4 | 1340 | |
7eaa943c TI |
1341 | if (snd_BUG_ON(!fcn)) |
1342 | return -EINVAL; | |
1da177e4 | 1343 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1344 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1345 | if (p->fioctl == fcn) { |
1346 | list_del(&p->list); | |
1347 | up_write(&snd_ioctl_rwsem); | |
1348 | kfree(p); | |
1349 | return 0; | |
1350 | } | |
1351 | } | |
1352 | up_write(&snd_ioctl_rwsem); | |
1353 | snd_BUG(); | |
1354 | return -EINVAL; | |
1355 | } | |
1356 | ||
1357 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1358 | { | |
1359 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1360 | } | |
1361 | ||
c0d3fb39 TI |
1362 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1363 | ||
1da177e4 LT |
1364 | #ifdef CONFIG_COMPAT |
1365 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1366 | { | |
1367 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1368 | } | |
1369 | ||
c0d3fb39 | 1370 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1371 | #endif |
1372 | ||
1373 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1374 | { | |
82e9bae6 | 1375 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1376 | int err; |
1377 | ctl = file->private_data; | |
1378 | err = fasync_helper(fd, file, on, &ctl->fasync); | |
1379 | if (err < 0) | |
1380 | return err; | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * ioctl32 compat | |
1386 | */ | |
1387 | #ifdef CONFIG_COMPAT | |
1388 | #include "control_compat.c" | |
1389 | #else | |
1390 | #define snd_ctl_ioctl_compat NULL | |
1391 | #endif | |
1392 | ||
1393 | /* | |
1394 | * INIT PART | |
1395 | */ | |
1396 | ||
9c2e08c5 | 1397 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1398 | { |
1399 | .owner = THIS_MODULE, | |
1400 | .read = snd_ctl_read, | |
1401 | .open = snd_ctl_open, | |
1402 | .release = snd_ctl_release, | |
1403 | .poll = snd_ctl_poll, | |
1404 | .unlocked_ioctl = snd_ctl_ioctl, | |
1405 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1406 | .fasync = snd_ctl_fasync, | |
1407 | }; | |
1408 | ||
1da177e4 LT |
1409 | /* |
1410 | * registration of the control device | |
1411 | */ | |
82e9bae6 | 1412 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1413 | { |
82e9bae6 | 1414 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1415 | int err, cardnum; |
1416 | char name[16]; | |
1417 | ||
7eaa943c TI |
1418 | if (snd_BUG_ON(!card)) |
1419 | return -ENXIO; | |
1da177e4 | 1420 | cardnum = card->number; |
7eaa943c TI |
1421 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1422 | return -ENXIO; | |
1da177e4 | 1423 | sprintf(name, "controlC%i", cardnum); |
f87135f5 CL |
1424 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1425 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1426 | return err; |
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | /* | |
1431 | * disconnection of the control device | |
1432 | */ | |
82e9bae6 | 1433 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1434 | { |
82e9bae6 | 1435 | struct snd_card *card = device->device_data; |
82e9bae6 | 1436 | struct snd_ctl_file *ctl; |
c461482c TI |
1437 | int err, cardnum; |
1438 | ||
7eaa943c TI |
1439 | if (snd_BUG_ON(!card)) |
1440 | return -ENXIO; | |
c461482c | 1441 | cardnum = card->number; |
7eaa943c TI |
1442 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1443 | return -ENXIO; | |
1da177e4 | 1444 | |
d8009882 | 1445 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1446 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1447 | wake_up(&ctl->change_sleep); |
1448 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1449 | } | |
d8009882 | 1450 | read_unlock(&card->ctl_files_rwlock); |
c461482c TI |
1451 | |
1452 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1453 | card, -1)) < 0) | |
1454 | return err; | |
1da177e4 LT |
1455 | return 0; |
1456 | } | |
1457 | ||
1458 | /* | |
1459 | * free all controls | |
1460 | */ | |
82e9bae6 | 1461 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1462 | { |
82e9bae6 TI |
1463 | struct snd_card *card = device->device_data; |
1464 | struct snd_kcontrol *control; | |
1da177e4 LT |
1465 | |
1466 | down_write(&card->controls_rwsem); | |
1467 | while (!list_empty(&card->controls)) { | |
1468 | control = snd_kcontrol(card->controls.next); | |
1469 | snd_ctl_remove(card, control); | |
1470 | } | |
1471 | up_write(&card->controls_rwsem); | |
1472 | return 0; | |
1473 | } | |
1474 | ||
1da177e4 LT |
1475 | /* |
1476 | * create control core: | |
1477 | * called from init.c | |
1478 | */ | |
82e9bae6 | 1479 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1480 | { |
82e9bae6 | 1481 | static struct snd_device_ops ops = { |
1da177e4 LT |
1482 | .dev_free = snd_ctl_dev_free, |
1483 | .dev_register = snd_ctl_dev_register, | |
1484 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1485 | }; |
1486 | ||
7eaa943c TI |
1487 | if (snd_BUG_ON(!card)) |
1488 | return -ENXIO; | |
1da177e4 LT |
1489 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); |
1490 | } | |
b9ed4f2b TI |
1491 | |
1492 | /* | |
1493 | * Frequently used control callbacks | |
1494 | */ | |
1495 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
1496 | struct snd_ctl_elem_info *uinfo) | |
1497 | { | |
1498 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1499 | uinfo->count = 1; | |
1500 | uinfo->value.integer.min = 0; | |
1501 | uinfo->value.integer.max = 1; | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); | |
1506 | ||
1507 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
1508 | struct snd_ctl_elem_info *uinfo) | |
1509 | { | |
1510 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1511 | uinfo->count = 2; | |
1512 | uinfo->value.integer.min = 0; | |
1513 | uinfo->value.integer.max = 1; | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1517 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |