Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Routines for driver control interface | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
4 | * |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/threads.h> |
23 | #include <linux/interrupt.h> | |
da155d5b | 24 | #include <linux/module.h> |
1da177e4 LT |
25 | #include <linux/slab.h> |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/time.h> | |
28 | #include <sound/core.h> | |
29 | #include <sound/minors.h> | |
30 | #include <sound/info.h> | |
31 | #include <sound/control.h> | |
32 | ||
33 | /* max number of user-defined controls */ | |
34 | #define MAX_USER_CONTROLS 32 | |
5591bf07 | 35 | #define MAX_CONTROL_COUNT 1028 |
1da177e4 | 36 | |
82e9bae6 | 37 | struct snd_kctl_ioctl { |
1da177e4 LT |
38 | struct list_head list; /* list of all ioctls */ |
39 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 40 | }; |
1da177e4 LT |
41 | |
42 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
43 | static LIST_HEAD(snd_control_ioctls); | |
44 | #ifdef CONFIG_COMPAT | |
45 | static LIST_HEAD(snd_control_compat_ioctls); | |
46 | #endif | |
47 | ||
48 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
49 | { | |
1da177e4 | 50 | unsigned long flags; |
82e9bae6 TI |
51 | struct snd_card *card; |
52 | struct snd_ctl_file *ctl; | |
23c18d4b | 53 | int i, err; |
1da177e4 | 54 | |
02f4865f TI |
55 | err = nonseekable_open(inode, file); |
56 | if (err < 0) | |
57 | return err; | |
58 | ||
f87135f5 | 59 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
60 | if (!card) { |
61 | err = -ENODEV; | |
62 | goto __error1; | |
63 | } | |
64 | err = snd_card_file_add(card, file); | |
65 | if (err < 0) { | |
66 | err = -ENODEV; | |
67 | goto __error1; | |
68 | } | |
69 | if (!try_module_get(card->module)) { | |
70 | err = -EFAULT; | |
71 | goto __error2; | |
72 | } | |
ca2c0966 | 73 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
74 | if (ctl == NULL) { |
75 | err = -ENOMEM; | |
76 | goto __error; | |
77 | } | |
78 | INIT_LIST_HEAD(&ctl->events); | |
79 | init_waitqueue_head(&ctl->change_sleep); | |
80 | spin_lock_init(&ctl->read_lock); | |
81 | ctl->card = card; | |
23c18d4b TI |
82 | for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++) |
83 | ctl->preferred_subdevice[i] = -1; | |
25d27ede | 84 | ctl->pid = get_pid(task_pid(current)); |
1da177e4 LT |
85 | file->private_data = ctl; |
86 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
87 | list_add_tail(&ctl->list, &card->ctl_files); | |
88 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
a0830dbd | 89 | snd_card_unref(card); |
1da177e4 LT |
90 | return 0; |
91 | ||
92 | __error: | |
93 | module_put(card->module); | |
94 | __error2: | |
95 | snd_card_file_remove(card, file); | |
96 | __error1: | |
a0830dbd TI |
97 | if (card) |
98 | snd_card_unref(card); | |
1da177e4 LT |
99 | return err; |
100 | } | |
101 | ||
82e9bae6 | 102 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 103 | { |
7507e8da | 104 | unsigned long flags; |
82e9bae6 | 105 | struct snd_kctl_event *cread; |
1da177e4 | 106 | |
7507e8da | 107 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
108 | while (!list_empty(&ctl->events)) { |
109 | cread = snd_kctl_event(ctl->events.next); | |
110 | list_del(&cread->list); | |
111 | kfree(cread); | |
112 | } | |
7507e8da | 113 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
114 | } |
115 | ||
116 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
117 | { | |
118 | unsigned long flags; | |
82e9bae6 TI |
119 | struct snd_card *card; |
120 | struct snd_ctl_file *ctl; | |
121 | struct snd_kcontrol *control; | |
1da177e4 LT |
122 | unsigned int idx; |
123 | ||
124 | ctl = file->private_data; | |
1da177e4 LT |
125 | file->private_data = NULL; |
126 | card = ctl->card; | |
127 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
128 | list_del(&ctl->list); | |
129 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
130 | down_write(&card->controls_rwsem); | |
9244b2c3 | 131 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
132 | for (idx = 0; idx < control->count; idx++) |
133 | if (control->vd[idx].owner == ctl) | |
134 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
135 | up_write(&card->controls_rwsem); |
136 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 137 | put_pid(ctl->pid); |
1da177e4 LT |
138 | kfree(ctl); |
139 | module_put(card->module); | |
140 | snd_card_file_remove(card, file); | |
141 | return 0; | |
142 | } | |
143 | ||
12cddbd8 TI |
144 | /** |
145 | * snd_ctl_notify - Send notification to user-space for a control change | |
146 | * @card: the card to send notification | |
147 | * @mask: the event mask, SNDRV_CTL_EVENT_* | |
148 | * @id: the ctl element id to send notification | |
149 | * | |
150 | * This function adds an event record with the given id and mask, appends | |
151 | * to the list and wakes up the user-space for notification. This can be | |
152 | * called in the atomic context. | |
153 | */ | |
82e9bae6 TI |
154 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
155 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
156 | { |
157 | unsigned long flags; | |
82e9bae6 TI |
158 | struct snd_ctl_file *ctl; |
159 | struct snd_kctl_event *ev; | |
1da177e4 | 160 | |
7eaa943c TI |
161 | if (snd_BUG_ON(!card || !id)) |
162 | return; | |
f388cdcd TI |
163 | if (card->shutdown) |
164 | return; | |
1da177e4 | 165 | read_lock(&card->ctl_files_rwlock); |
8eeaa2f9 | 166 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
167 | card->mixer_oss_change_count++; |
168 | #endif | |
9244b2c3 | 169 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
170 | if (!ctl->subscribed) |
171 | continue; | |
172 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 173 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
174 | if (ev->id.numid == id->numid) { |
175 | ev->mask |= mask; | |
176 | goto _found; | |
177 | } | |
178 | } | |
ca2c0966 | 179 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
180 | if (ev) { |
181 | ev->id = *id; | |
182 | ev->mask = mask; | |
183 | list_add_tail(&ev->list, &ctl->events); | |
184 | } else { | |
bb009457 | 185 | dev_err(card->dev, "No memory available to allocate event\n"); |
1da177e4 LT |
186 | } |
187 | _found: | |
188 | wake_up(&ctl->change_sleep); | |
189 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
190 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
191 | } | |
192 | read_unlock(&card->ctl_files_rwlock); | |
193 | } | |
c0d3fb39 TI |
194 | EXPORT_SYMBOL(snd_ctl_notify); |
195 | ||
1da177e4 | 196 | /** |
2225e79b TS |
197 | * snd_ctl_new - create a new control instance with some elements |
198 | * @kctl: the pointer to store new control instance | |
199 | * @count: the number of elements in this control | |
200 | * @access: the default access flags for elements in this control | |
201 | * @file: given when locking these elements | |
1da177e4 | 202 | * |
2225e79b TS |
203 | * Allocates a memory object for a new control instance. The instance has |
204 | * elements as many as the given number (@count). Each element has given | |
205 | * access permissions (@access). Each element is locked when @file is given. | |
1da177e4 | 206 | * |
2225e79b | 207 | * Return: 0 on success, error code on failure |
1da177e4 | 208 | */ |
2225e79b TS |
209 | static int snd_ctl_new(struct snd_kcontrol **kctl, unsigned int count, |
210 | unsigned int access, struct snd_ctl_file *file) | |
1da177e4 | 211 | { |
2225e79b | 212 | unsigned int size; |
1da177e4 LT |
213 | unsigned int idx; |
214 | ||
2225e79b TS |
215 | if (count == 0 || count > MAX_CONTROL_COUNT) |
216 | return -EINVAL; | |
5591bf07 | 217 | |
2225e79b TS |
218 | size = sizeof(struct snd_kcontrol); |
219 | size += sizeof(struct snd_kcontrol_volatile) * count; | |
5591bf07 | 220 | |
2225e79b | 221 | *kctl = kzalloc(size, GFP_KERNEL); |
ec0e9937 | 222 | if (!*kctl) |
2225e79b | 223 | return -ENOMEM; |
2225e79b TS |
224 | |
225 | for (idx = 0; idx < count; idx++) { | |
226 | (*kctl)->vd[idx].access = access; | |
227 | (*kctl)->vd[idx].owner = file; | |
228 | } | |
229 | (*kctl)->count = count; | |
230 | ||
231 | return 0; | |
1da177e4 LT |
232 | } |
233 | ||
234 | /** | |
235 | * snd_ctl_new1 - create a control instance from the template | |
236 | * @ncontrol: the initialization record | |
237 | * @private_data: the private data to set | |
238 | * | |
82e9bae6 | 239 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
240 | * template. When the access field of ncontrol is 0, it's assumed as |
241 | * READWRITE access. When the count field is 0, it's assumes as one. | |
242 | * | |
eb7c06e8 | 243 | * Return: The pointer of the newly generated instance, or %NULL on failure. |
1da177e4 | 244 | */ |
82e9bae6 TI |
245 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
246 | void *private_data) | |
1da177e4 | 247 | { |
2225e79b TS |
248 | struct snd_kcontrol *kctl; |
249 | unsigned int count; | |
1da177e4 | 250 | unsigned int access; |
2225e79b | 251 | int err; |
1da177e4 | 252 | |
7eaa943c TI |
253 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
254 | return NULL; | |
2225e79b TS |
255 | |
256 | count = ncontrol->count; | |
257 | if (count == 0) | |
258 | count = 1; | |
259 | ||
260 | access = ncontrol->access; | |
261 | if (access == 0) | |
262 | access = SNDRV_CTL_ELEM_ACCESS_READWRITE; | |
263 | access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | | |
264 | SNDRV_CTL_ELEM_ACCESS_VOLATILE | | |
265 | SNDRV_CTL_ELEM_ACCESS_INACTIVE | | |
266 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE | | |
267 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND | | |
268 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK); | |
269 | ||
270 | err = snd_ctl_new(&kctl, count, access, NULL); | |
271 | if (err < 0) | |
272 | return NULL; | |
273 | ||
274 | /* The 'numid' member is decided when calling snd_ctl_add(). */ | |
275 | kctl->id.iface = ncontrol->iface; | |
276 | kctl->id.device = ncontrol->device; | |
277 | kctl->id.subdevice = ncontrol->subdevice; | |
366840d7 | 278 | if (ncontrol->name) { |
2225e79b TS |
279 | strlcpy(kctl->id.name, ncontrol->name, sizeof(kctl->id.name)); |
280 | if (strcmp(ncontrol->name, kctl->id.name) != 0) | |
bb009457 | 281 | pr_warn("ALSA: Control name '%s' truncated to '%s'\n", |
2225e79b | 282 | ncontrol->name, kctl->id.name); |
366840d7 | 283 | } |
2225e79b TS |
284 | kctl->id.index = ncontrol->index; |
285 | ||
286 | kctl->info = ncontrol->info; | |
287 | kctl->get = ncontrol->get; | |
288 | kctl->put = ncontrol->put; | |
289 | kctl->tlv.p = ncontrol->tlv.p; | |
290 | ||
291 | kctl->private_value = ncontrol->private_value; | |
292 | kctl->private_data = private_data; | |
293 | ||
294 | return kctl; | |
1da177e4 | 295 | } |
c0d3fb39 TI |
296 | EXPORT_SYMBOL(snd_ctl_new1); |
297 | ||
1da177e4 LT |
298 | /** |
299 | * snd_ctl_free_one - release the control instance | |
300 | * @kcontrol: the control instance | |
301 | * | |
302 | * Releases the control instance created via snd_ctl_new() | |
303 | * or snd_ctl_new1(). | |
304 | * Don't call this after the control was added to the card. | |
305 | */ | |
82e9bae6 | 306 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
307 | { |
308 | if (kcontrol) { | |
309 | if (kcontrol->private_free) | |
310 | kcontrol->private_free(kcontrol); | |
311 | kfree(kcontrol); | |
312 | } | |
313 | } | |
c0d3fb39 TI |
314 | EXPORT_SYMBOL(snd_ctl_free_one); |
315 | ||
0e82e5fa CL |
316 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
317 | unsigned int count) | |
1da177e4 | 318 | { |
82e9bae6 | 319 | struct snd_kcontrol *kctl; |
1da177e4 | 320 | |
ac902c11 LPC |
321 | /* Make sure that the ids assigned to the control do not wrap around */ |
322 | if (card->last_numid >= UINT_MAX - count) | |
323 | card->last_numid = 0; | |
324 | ||
9244b2c3 | 325 | list_for_each_entry(kctl, &card->controls, list) { |
7c733587 | 326 | if (kctl->id.numid < card->last_numid + 1 + count && |
0e82e5fa CL |
327 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
328 | card->last_numid = kctl->id.numid + kctl->count - 1; | |
329 | return true; | |
330 | } | |
1da177e4 | 331 | } |
0e82e5fa | 332 | return false; |
1da177e4 LT |
333 | } |
334 | ||
82e9bae6 | 335 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 | 336 | { |
0e82e5fa | 337 | unsigned int iter = 100000; |
1da177e4 | 338 | |
0e82e5fa | 339 | while (snd_ctl_remove_numid_conflict(card, count)) { |
1da177e4 LT |
340 | if (--iter == 0) { |
341 | /* this situation is very unlikely */ | |
bb009457 | 342 | dev_err(card->dev, "unable to allocate new control numid\n"); |
1da177e4 LT |
343 | return -ENOMEM; |
344 | } | |
1da177e4 LT |
345 | } |
346 | return 0; | |
347 | } | |
348 | ||
349 | /** | |
350 | * snd_ctl_add - add the control instance to the card | |
351 | * @card: the card instance | |
352 | * @kcontrol: the control instance to add | |
353 | * | |
354 | * Adds the control instance created via snd_ctl_new() or | |
355 | * snd_ctl_new1() to the given card. Assigns also an unique | |
356 | * numid used for fast search. | |
357 | * | |
1da177e4 | 358 | * It frees automatically the control which cannot be added. |
eb7c06e8 YB |
359 | * |
360 | * Return: Zero if successful, or a negative error code on failure. | |
361 | * | |
1da177e4 | 362 | */ |
82e9bae6 | 363 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 364 | { |
82e9bae6 | 365 | struct snd_ctl_elem_id id; |
1da177e4 | 366 | unsigned int idx; |
fd9f26e4 | 367 | unsigned int count; |
c6077b30 | 368 | int err = -EINVAL; |
1da177e4 | 369 | |
73e77ba0 | 370 | if (! kcontrol) |
c6077b30 | 371 | return err; |
7eaa943c TI |
372 | if (snd_BUG_ON(!card || !kcontrol->info)) |
373 | goto error; | |
1da177e4 | 374 | id = kcontrol->id; |
883a1d49 LPC |
375 | if (id.index > UINT_MAX - kcontrol->count) |
376 | goto error; | |
377 | ||
1da177e4 LT |
378 | down_write(&card->controls_rwsem); |
379 | if (snd_ctl_find_id(card, &id)) { | |
380 | up_write(&card->controls_rwsem); | |
bb009457 | 381 | dev_err(card->dev, "control %i:%i:%i:%s:%i is already present\n", |
1da177e4 LT |
382 | id.iface, |
383 | id.device, | |
384 | id.subdevice, | |
385 | id.name, | |
386 | id.index); | |
c6077b30 TI |
387 | err = -EBUSY; |
388 | goto error; | |
1da177e4 LT |
389 | } |
390 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
391 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
392 | err = -ENOMEM; |
393 | goto error; | |
1da177e4 LT |
394 | } |
395 | list_add_tail(&kcontrol->list, &card->controls); | |
396 | card->controls_count += kcontrol->count; | |
397 | kcontrol->id.numid = card->last_numid + 1; | |
398 | card->last_numid += kcontrol->count; | |
d34890cf | 399 | id = kcontrol->id; |
fd9f26e4 | 400 | count = kcontrol->count; |
1da177e4 | 401 | up_write(&card->controls_rwsem); |
fd9f26e4 | 402 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
1da177e4 LT |
403 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
404 | return 0; | |
c6077b30 TI |
405 | |
406 | error: | |
407 | snd_ctl_free_one(kcontrol); | |
408 | return err; | |
1da177e4 | 409 | } |
c0d3fb39 TI |
410 | EXPORT_SYMBOL(snd_ctl_add); |
411 | ||
66b5b972 DP |
412 | /** |
413 | * snd_ctl_replace - replace the control instance of the card | |
414 | * @card: the card instance | |
415 | * @kcontrol: the control instance to replace | |
416 | * @add_on_replace: add the control if not already added | |
417 | * | |
418 | * Replaces the given control. If the given control does not exist | |
419 | * and the add_on_replace flag is set, the control is added. If the | |
420 | * control exists, it is destroyed first. | |
421 | * | |
66b5b972 | 422 | * It frees automatically the control which cannot be added or replaced. |
eb7c06e8 YB |
423 | * |
424 | * Return: Zero if successful, or a negative error code on failure. | |
66b5b972 DP |
425 | */ |
426 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, | |
427 | bool add_on_replace) | |
428 | { | |
429 | struct snd_ctl_elem_id id; | |
fd9f26e4 | 430 | unsigned int count; |
66b5b972 DP |
431 | unsigned int idx; |
432 | struct snd_kcontrol *old; | |
433 | int ret; | |
434 | ||
435 | if (!kcontrol) | |
436 | return -EINVAL; | |
437 | if (snd_BUG_ON(!card || !kcontrol->info)) { | |
438 | ret = -EINVAL; | |
439 | goto error; | |
440 | } | |
441 | id = kcontrol->id; | |
442 | down_write(&card->controls_rwsem); | |
443 | old = snd_ctl_find_id(card, &id); | |
444 | if (!old) { | |
445 | if (add_on_replace) | |
446 | goto add; | |
447 | up_write(&card->controls_rwsem); | |
448 | ret = -EINVAL; | |
449 | goto error; | |
450 | } | |
451 | ret = snd_ctl_remove(card, old); | |
452 | if (ret < 0) { | |
453 | up_write(&card->controls_rwsem); | |
454 | goto error; | |
455 | } | |
456 | add: | |
457 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
458 | up_write(&card->controls_rwsem); | |
459 | ret = -ENOMEM; | |
460 | goto error; | |
461 | } | |
462 | list_add_tail(&kcontrol->list, &card->controls); | |
463 | card->controls_count += kcontrol->count; | |
464 | kcontrol->id.numid = card->last_numid + 1; | |
465 | card->last_numid += kcontrol->count; | |
e6ff3840 | 466 | id = kcontrol->id; |
fd9f26e4 | 467 | count = kcontrol->count; |
66b5b972 | 468 | up_write(&card->controls_rwsem); |
fd9f26e4 | 469 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
66b5b972 DP |
470 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
471 | return 0; | |
472 | ||
473 | error: | |
474 | snd_ctl_free_one(kcontrol); | |
475 | return ret; | |
476 | } | |
477 | EXPORT_SYMBOL(snd_ctl_replace); | |
478 | ||
1da177e4 LT |
479 | /** |
480 | * snd_ctl_remove - remove the control from the card and release it | |
481 | * @card: the card instance | |
482 | * @kcontrol: the control instance to remove | |
483 | * | |
484 | * Removes the control from the card and then releases the instance. | |
485 | * You don't need to call snd_ctl_free_one(). You must be in | |
486 | * the write lock - down_write(&card->controls_rwsem). | |
eb7c06e8 YB |
487 | * |
488 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 489 | */ |
82e9bae6 | 490 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 491 | { |
82e9bae6 | 492 | struct snd_ctl_elem_id id; |
1da177e4 LT |
493 | unsigned int idx; |
494 | ||
7eaa943c TI |
495 | if (snd_BUG_ON(!card || !kcontrol)) |
496 | return -EINVAL; | |
1da177e4 LT |
497 | list_del(&kcontrol->list); |
498 | card->controls_count -= kcontrol->count; | |
499 | id = kcontrol->id; | |
500 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
501 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
502 | snd_ctl_free_one(kcontrol); | |
503 | return 0; | |
504 | } | |
c0d3fb39 TI |
505 | EXPORT_SYMBOL(snd_ctl_remove); |
506 | ||
1da177e4 LT |
507 | /** |
508 | * snd_ctl_remove_id - remove the control of the given id and release it | |
509 | * @card: the card instance | |
510 | * @id: the control id to remove | |
511 | * | |
512 | * Finds the control instance with the given id, removes it from the | |
513 | * card list and releases it. | |
eb7c06e8 YB |
514 | * |
515 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 516 | */ |
82e9bae6 | 517 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 518 | { |
82e9bae6 | 519 | struct snd_kcontrol *kctl; |
1da177e4 LT |
520 | int ret; |
521 | ||
522 | down_write(&card->controls_rwsem); | |
523 | kctl = snd_ctl_find_id(card, id); | |
524 | if (kctl == NULL) { | |
525 | up_write(&card->controls_rwsem); | |
526 | return -ENOENT; | |
527 | } | |
528 | ret = snd_ctl_remove(card, kctl); | |
529 | up_write(&card->controls_rwsem); | |
530 | return ret; | |
531 | } | |
c0d3fb39 TI |
532 | EXPORT_SYMBOL(snd_ctl_remove_id); |
533 | ||
1da177e4 | 534 | /** |
f217ac59 | 535 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
536 | * @file: active control handle |
537 | * @id: the control id to remove | |
538 | * | |
539 | * Finds the control instance with the given id, removes it from the | |
540 | * card list and releases it. | |
eb7c06e8 YB |
541 | * |
542 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 543 | */ |
f217ac59 CL |
544 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
545 | struct snd_ctl_elem_id *id) | |
1da177e4 | 546 | { |
82e9bae6 TI |
547 | struct snd_card *card = file->card; |
548 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
549 | int idx, ret; |
550 | ||
551 | down_write(&card->controls_rwsem); | |
552 | kctl = snd_ctl_find_id(card, id); | |
553 | if (kctl == NULL) { | |
317b8081 CL |
554 | ret = -ENOENT; |
555 | goto error; | |
1da177e4 | 556 | } |
18dd0aa5 CL |
557 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
558 | ret = -EINVAL; | |
559 | goto error; | |
560 | } | |
1da177e4 LT |
561 | for (idx = 0; idx < kctl->count; idx++) |
562 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
563 | ret = -EBUSY; |
564 | goto error; | |
1da177e4 LT |
565 | } |
566 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
567 | if (ret < 0) |
568 | goto error; | |
569 | card->user_ctl_count--; | |
317b8081 | 570 | error: |
1da177e4 LT |
571 | up_write(&card->controls_rwsem); |
572 | return ret; | |
573 | } | |
574 | ||
3cbdd753 TI |
575 | /** |
576 | * snd_ctl_activate_id - activate/inactivate the control of the given id | |
577 | * @card: the card instance | |
578 | * @id: the control id to activate/inactivate | |
579 | * @active: non-zero to activate | |
580 | * | |
581 | * Finds the control instance with the given id, and activate or | |
582 | * inactivate the control together with notification, if changed. | |
c78497e0 | 583 | * The given ID data is filled with full information. |
3cbdd753 | 584 | * |
eb7c06e8 | 585 | * Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
3cbdd753 TI |
586 | */ |
587 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, | |
588 | int active) | |
589 | { | |
590 | struct snd_kcontrol *kctl; | |
591 | struct snd_kcontrol_volatile *vd; | |
592 | unsigned int index_offset; | |
593 | int ret; | |
594 | ||
595 | down_write(&card->controls_rwsem); | |
596 | kctl = snd_ctl_find_id(card, id); | |
597 | if (kctl == NULL) { | |
598 | ret = -ENOENT; | |
599 | goto unlock; | |
600 | } | |
31584ed1 | 601 | index_offset = snd_ctl_get_ioff(kctl, id); |
3cbdd753 TI |
602 | vd = &kctl->vd[index_offset]; |
603 | ret = 0; | |
604 | if (active) { | |
605 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) | |
606 | goto unlock; | |
607 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
608 | } else { | |
609 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) | |
610 | goto unlock; | |
611 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
612 | } | |
c78497e0 | 613 | snd_ctl_build_ioff(id, kctl, index_offset); |
3cbdd753 TI |
614 | ret = 1; |
615 | unlock: | |
616 | up_write(&card->controls_rwsem); | |
617 | if (ret > 0) | |
618 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); | |
619 | return ret; | |
620 | } | |
621 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); | |
622 | ||
1da177e4 LT |
623 | /** |
624 | * snd_ctl_rename_id - replace the id of a control on the card | |
625 | * @card: the card instance | |
626 | * @src_id: the old id | |
627 | * @dst_id: the new id | |
628 | * | |
629 | * Finds the control with the old id from the card, and replaces the | |
630 | * id with the new one. | |
631 | * | |
eb7c06e8 | 632 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 633 | */ |
82e9bae6 TI |
634 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
635 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 636 | { |
82e9bae6 | 637 | struct snd_kcontrol *kctl; |
1da177e4 LT |
638 | |
639 | down_write(&card->controls_rwsem); | |
640 | kctl = snd_ctl_find_id(card, src_id); | |
641 | if (kctl == NULL) { | |
642 | up_write(&card->controls_rwsem); | |
643 | return -ENOENT; | |
644 | } | |
645 | kctl->id = *dst_id; | |
646 | kctl->id.numid = card->last_numid + 1; | |
647 | card->last_numid += kctl->count; | |
648 | up_write(&card->controls_rwsem); | |
649 | return 0; | |
650 | } | |
c0d3fb39 TI |
651 | EXPORT_SYMBOL(snd_ctl_rename_id); |
652 | ||
1da177e4 LT |
653 | /** |
654 | * snd_ctl_find_numid - find the control instance with the given number-id | |
655 | * @card: the card instance | |
656 | * @numid: the number-id to search | |
657 | * | |
658 | * Finds the control instance with the given number-id from the card. | |
659 | * | |
1da177e4 LT |
660 | * The caller must down card->controls_rwsem before calling this function |
661 | * (if the race condition can happen). | |
eb7c06e8 YB |
662 | * |
663 | * Return: The pointer of the instance if found, or %NULL if not. | |
664 | * | |
1da177e4 | 665 | */ |
82e9bae6 | 666 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 667 | { |
82e9bae6 | 668 | struct snd_kcontrol *kctl; |
1da177e4 | 669 | |
7eaa943c TI |
670 | if (snd_BUG_ON(!card || !numid)) |
671 | return NULL; | |
9244b2c3 | 672 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
673 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
674 | return kctl; | |
675 | } | |
676 | return NULL; | |
677 | } | |
c0d3fb39 TI |
678 | EXPORT_SYMBOL(snd_ctl_find_numid); |
679 | ||
1da177e4 LT |
680 | /** |
681 | * snd_ctl_find_id - find the control instance with the given id | |
682 | * @card: the card instance | |
683 | * @id: the id to search | |
684 | * | |
685 | * Finds the control instance with the given id from the card. | |
686 | * | |
1da177e4 LT |
687 | * The caller must down card->controls_rwsem before calling this function |
688 | * (if the race condition can happen). | |
eb7c06e8 YB |
689 | * |
690 | * Return: The pointer of the instance if found, or %NULL if not. | |
691 | * | |
1da177e4 | 692 | */ |
82e9bae6 TI |
693 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
694 | struct snd_ctl_elem_id *id) | |
1da177e4 | 695 | { |
82e9bae6 | 696 | struct snd_kcontrol *kctl; |
1da177e4 | 697 | |
7eaa943c TI |
698 | if (snd_BUG_ON(!card || !id)) |
699 | return NULL; | |
1da177e4 LT |
700 | if (id->numid != 0) |
701 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 702 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
703 | if (kctl->id.iface != id->iface) |
704 | continue; | |
705 | if (kctl->id.device != id->device) | |
706 | continue; | |
707 | if (kctl->id.subdevice != id->subdevice) | |
708 | continue; | |
709 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
710 | continue; | |
711 | if (kctl->id.index > id->index) | |
712 | continue; | |
713 | if (kctl->id.index + kctl->count <= id->index) | |
714 | continue; | |
715 | return kctl; | |
716 | } | |
717 | return NULL; | |
718 | } | |
c0d3fb39 TI |
719 | EXPORT_SYMBOL(snd_ctl_find_id); |
720 | ||
82e9bae6 | 721 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
722 | unsigned int cmd, void __user *arg) |
723 | { | |
82e9bae6 | 724 | struct snd_ctl_card_info *info; |
1da177e4 | 725 | |
ca2c0966 | 726 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
727 | if (! info) |
728 | return -ENOMEM; | |
729 | down_read(&snd_ioctl_rwsem); | |
730 | info->card = card->number; | |
731 | strlcpy(info->id, card->id, sizeof(info->id)); | |
732 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
733 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
734 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
735 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
736 | strlcpy(info->components, card->components, sizeof(info->components)); | |
737 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 738 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
739 | kfree(info); |
740 | return -EFAULT; | |
741 | } | |
742 | kfree(info); | |
743 | return 0; | |
744 | } | |
745 | ||
82e9bae6 TI |
746 | static int snd_ctl_elem_list(struct snd_card *card, |
747 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
748 | { |
749 | struct list_head *plist; | |
82e9bae6 TI |
750 | struct snd_ctl_elem_list list; |
751 | struct snd_kcontrol *kctl; | |
752 | struct snd_ctl_elem_id *dst, *id; | |
78fa2c4d | 753 | unsigned int offset, space, jidx; |
1da177e4 LT |
754 | |
755 | if (copy_from_user(&list, _list, sizeof(list))) | |
756 | return -EFAULT; | |
757 | offset = list.offset; | |
758 | space = list.space; | |
1da177e4 LT |
759 | /* try limit maximum space */ |
760 | if (space > 16384) | |
761 | return -ENOMEM; | |
762 | if (space > 0) { | |
763 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 764 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
765 | if (dst == NULL) |
766 | return -ENOMEM; | |
767 | down_read(&card->controls_rwsem); | |
768 | list.count = card->controls_count; | |
769 | plist = card->controls.next; | |
770 | while (plist != &card->controls) { | |
771 | if (offset == 0) | |
772 | break; | |
773 | kctl = snd_kcontrol(plist); | |
774 | if (offset < kctl->count) | |
775 | break; | |
776 | offset -= kctl->count; | |
777 | plist = plist->next; | |
778 | } | |
779 | list.used = 0; | |
780 | id = dst; | |
781 | while (space > 0 && plist != &card->controls) { | |
782 | kctl = snd_kcontrol(plist); | |
783 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
784 | snd_ctl_build_ioff(id, kctl, jidx); | |
785 | id++; | |
786 | space--; | |
787 | list.used++; | |
788 | } | |
789 | plist = plist->next; | |
790 | offset = 0; | |
791 | } | |
792 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
793 | if (list.used > 0 && |
794 | copy_to_user(list.pids, dst, | |
795 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
796 | vfree(dst); |
797 | return -EFAULT; | |
798 | } | |
799 | vfree(dst); | |
800 | } else { | |
801 | down_read(&card->controls_rwsem); | |
802 | list.count = card->controls_count; | |
803 | up_read(&card->controls_rwsem); | |
804 | } | |
805 | if (copy_to_user(_list, &list, sizeof(list))) | |
806 | return -EFAULT; | |
807 | return 0; | |
808 | } | |
809 | ||
860c1994 TS |
810 | static bool validate_element_member_dimension(struct snd_ctl_elem_info *info) |
811 | { | |
812 | unsigned int members; | |
813 | unsigned int i; | |
814 | ||
815 | if (info->dimen.d[0] == 0) | |
816 | return true; | |
817 | ||
818 | members = 1; | |
819 | for (i = 0; i < ARRAY_SIZE(info->dimen.d); ++i) { | |
820 | if (info->dimen.d[i] == 0) | |
821 | break; | |
822 | members *= info->dimen.d[i]; | |
823 | ||
824 | /* | |
825 | * info->count should be validated in advance, to guarantee | |
826 | * calculation soundness. | |
827 | */ | |
828 | if (members > info->count) | |
829 | return false; | |
830 | } | |
831 | ||
832 | for (++i; i < ARRAY_SIZE(info->dimen.d); ++i) { | |
833 | if (info->dimen.d[i] > 0) | |
834 | return false; | |
835 | } | |
836 | ||
837 | return members == info->count; | |
838 | } | |
839 | ||
82e9bae6 TI |
840 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
841 | struct snd_ctl_elem_info *info) | |
1da177e4 | 842 | { |
82e9bae6 TI |
843 | struct snd_card *card = ctl->card; |
844 | struct snd_kcontrol *kctl; | |
845 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
846 | unsigned int index_offset; |
847 | int result; | |
848 | ||
849 | down_read(&card->controls_rwsem); | |
850 | kctl = snd_ctl_find_id(card, &info->id); | |
851 | if (kctl == NULL) { | |
852 | up_read(&card->controls_rwsem); | |
853 | return -ENOENT; | |
854 | } | |
855 | #ifdef CONFIG_SND_DEBUG | |
856 | info->access = 0; | |
857 | #endif | |
858 | result = kctl->info(kctl, info); | |
859 | if (result >= 0) { | |
7eaa943c | 860 | snd_BUG_ON(info->access); |
1da177e4 LT |
861 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
862 | vd = &kctl->vd[index_offset]; | |
863 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
864 | info->access = vd->access; | |
865 | if (vd->owner) { | |
866 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
867 | if (vd->owner == ctl) | |
868 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 869 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
870 | } else { |
871 | info->owner = -1; | |
872 | } | |
873 | } | |
874 | up_read(&card->controls_rwsem); | |
875 | return result; | |
876 | } | |
877 | ||
82e9bae6 TI |
878 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
879 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 880 | { |
82e9bae6 | 881 | struct snd_ctl_elem_info info; |
1da177e4 LT |
882 | int result; |
883 | ||
884 | if (copy_from_user(&info, _info, sizeof(info))) | |
885 | return -EFAULT; | |
64649400 | 886 | snd_power_lock(ctl->card); |
cbac4b0c | 887 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
888 | if (result >= 0) |
889 | result = snd_ctl_elem_info(ctl, &info); | |
890 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
891 | if (result >= 0) |
892 | if (copy_to_user(_info, &info, sizeof(info))) | |
893 | return -EFAULT; | |
894 | return result; | |
895 | } | |
896 | ||
d3bd67cd TI |
897 | static int snd_ctl_elem_read(struct snd_card *card, |
898 | struct snd_ctl_elem_value *control) | |
1da177e4 | 899 | { |
82e9bae6 TI |
900 | struct snd_kcontrol *kctl; |
901 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 902 | unsigned int index_offset; |
8ace4f3c | 903 | int result; |
1da177e4 LT |
904 | |
905 | down_read(&card->controls_rwsem); | |
906 | kctl = snd_ctl_find_id(card, &control->id); | |
907 | if (kctl == NULL) { | |
908 | result = -ENOENT; | |
909 | } else { | |
910 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
911 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
912 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
913 | kctl->get != NULL) { | |
914 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
915 | result = kctl->get(kctl, control); | |
916 | } else | |
917 | result = -EPERM; | |
1da177e4 LT |
918 | } |
919 | up_read(&card->controls_rwsem); | |
920 | return result; | |
921 | } | |
922 | ||
82e9bae6 TI |
923 | static int snd_ctl_elem_read_user(struct snd_card *card, |
924 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 925 | { |
82e9bae6 | 926 | struct snd_ctl_elem_value *control; |
1da177e4 | 927 | int result; |
ef44a1ec LZ |
928 | |
929 | control = memdup_user(_control, sizeof(*control)); | |
930 | if (IS_ERR(control)) | |
931 | return PTR_ERR(control); | |
932 | ||
64649400 | 933 | snd_power_lock(card); |
cbac4b0c | 934 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
935 | if (result >= 0) |
936 | result = snd_ctl_elem_read(card, control); | |
937 | snd_power_unlock(card); | |
1da177e4 LT |
938 | if (result >= 0) |
939 | if (copy_to_user(_control, control, sizeof(*control))) | |
940 | result = -EFAULT; | |
941 | kfree(control); | |
942 | return result; | |
943 | } | |
944 | ||
d3bd67cd TI |
945 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
946 | struct snd_ctl_elem_value *control) | |
1da177e4 | 947 | { |
82e9bae6 TI |
948 | struct snd_kcontrol *kctl; |
949 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 950 | unsigned int index_offset; |
8ace4f3c | 951 | int result; |
1da177e4 LT |
952 | |
953 | down_read(&card->controls_rwsem); | |
954 | kctl = snd_ctl_find_id(card, &control->id); | |
955 | if (kctl == NULL) { | |
956 | result = -ENOENT; | |
957 | } else { | |
958 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
959 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
960 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
961 | kctl->put == NULL || | |
962 | (file && vd->owner && vd->owner != file)) { | |
963 | result = -EPERM; | |
1da177e4 | 964 | } else { |
8ace4f3c TI |
965 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
966 | result = kctl->put(kctl, control); | |
967 | } | |
968 | if (result > 0) { | |
fd9f26e4 | 969 | struct snd_ctl_elem_id id = control->id; |
8ace4f3c | 970 | up_read(&card->controls_rwsem); |
fd9f26e4 | 971 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id); |
8ace4f3c | 972 | return 0; |
1da177e4 LT |
973 | } |
974 | } | |
975 | up_read(&card->controls_rwsem); | |
976 | return result; | |
977 | } | |
978 | ||
82e9bae6 TI |
979 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
980 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 981 | { |
82e9bae6 | 982 | struct snd_ctl_elem_value *control; |
64649400 | 983 | struct snd_card *card; |
1da177e4 LT |
984 | int result; |
985 | ||
ef44a1ec LZ |
986 | control = memdup_user(_control, sizeof(*control)); |
987 | if (IS_ERR(control)) | |
988 | return PTR_ERR(control); | |
989 | ||
64649400 GP |
990 | card = file->card; |
991 | snd_power_lock(card); | |
cbac4b0c | 992 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
993 | if (result >= 0) |
994 | result = snd_ctl_elem_write(card, file, control); | |
995 | snd_power_unlock(card); | |
1da177e4 LT |
996 | if (result >= 0) |
997 | if (copy_to_user(_control, control, sizeof(*control))) | |
998 | result = -EFAULT; | |
999 | kfree(control); | |
1000 | return result; | |
1001 | } | |
1002 | ||
82e9bae6 TI |
1003 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
1004 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1005 | { |
82e9bae6 TI |
1006 | struct snd_card *card = file->card; |
1007 | struct snd_ctl_elem_id id; | |
1008 | struct snd_kcontrol *kctl; | |
1009 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
1010 | int result; |
1011 | ||
1012 | if (copy_from_user(&id, _id, sizeof(id))) | |
1013 | return -EFAULT; | |
1014 | down_write(&card->controls_rwsem); | |
1015 | kctl = snd_ctl_find_id(card, &id); | |
1016 | if (kctl == NULL) { | |
1017 | result = -ENOENT; | |
1018 | } else { | |
1019 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
1020 | if (vd->owner != NULL) | |
1021 | result = -EBUSY; | |
1022 | else { | |
1023 | vd->owner = file; | |
1da177e4 LT |
1024 | result = 0; |
1025 | } | |
1026 | } | |
1027 | up_write(&card->controls_rwsem); | |
1028 | return result; | |
1029 | } | |
1030 | ||
82e9bae6 TI |
1031 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
1032 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1033 | { |
82e9bae6 TI |
1034 | struct snd_card *card = file->card; |
1035 | struct snd_ctl_elem_id id; | |
1036 | struct snd_kcontrol *kctl; | |
1037 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
1038 | int result; |
1039 | ||
1040 | if (copy_from_user(&id, _id, sizeof(id))) | |
1041 | return -EFAULT; | |
1042 | down_write(&card->controls_rwsem); | |
1043 | kctl = snd_ctl_find_id(card, &id); | |
1044 | if (kctl == NULL) { | |
1045 | result = -ENOENT; | |
1046 | } else { | |
1047 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
1048 | if (vd->owner == NULL) | |
1049 | result = -EINVAL; | |
1050 | else if (vd->owner != file) | |
1051 | result = -EPERM; | |
1052 | else { | |
1053 | vd->owner = NULL; | |
1da177e4 LT |
1054 | result = 0; |
1055 | } | |
1056 | } | |
1057 | up_write(&card->controls_rwsem); | |
1058 | return result; | |
1059 | } | |
1060 | ||
1061 | struct user_element { | |
82e9bae6 | 1062 | struct snd_ctl_elem_info info; |
07f4d9d7 | 1063 | struct snd_card *card; |
e1c78df1 | 1064 | char *elem_data; /* element data */ |
1da177e4 | 1065 | unsigned long elem_data_size; /* size of element data in bytes */ |
8aa9b586 JK |
1066 | void *tlv_data; /* TLV data */ |
1067 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 | 1068 | void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4 LT |
1069 | }; |
1070 | ||
82e9bae6 TI |
1071 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
1072 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
1073 | { |
1074 | struct user_element *ue = kcontrol->private_data; | |
c378c3b0 | 1075 | unsigned int offset; |
1da177e4 | 1076 | |
c378c3b0 | 1077 | offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
1da177e4 | 1078 | *uinfo = ue->info; |
c378c3b0 TS |
1079 | snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
1080 | ||
1da177e4 LT |
1081 | return 0; |
1082 | } | |
1083 | ||
8d448162 CL |
1084 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
1085 | struct snd_ctl_elem_info *uinfo) | |
1086 | { | |
1087 | struct user_element *ue = kcontrol->private_data; | |
1088 | const char *names; | |
1089 | unsigned int item; | |
c378c3b0 | 1090 | unsigned int offset; |
8d448162 CL |
1091 | |
1092 | item = uinfo->value.enumerated.item; | |
1093 | ||
c378c3b0 | 1094 | offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
8d448162 | 1095 | *uinfo = ue->info; |
c378c3b0 | 1096 | snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
8d448162 CL |
1097 | |
1098 | item = min(item, uinfo->value.enumerated.items - 1); | |
1099 | uinfo->value.enumerated.item = item; | |
1100 | ||
1101 | names = ue->priv_data; | |
1102 | for (; item > 0; --item) | |
1103 | names += strlen(names) + 1; | |
1104 | strcpy(uinfo->value.enumerated.name, names); | |
1105 | ||
1106 | return 0; | |
1107 | } | |
1108 | ||
82e9bae6 TI |
1109 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
1110 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1111 | { |
1112 | struct user_element *ue = kcontrol->private_data; | |
e1c78df1 TS |
1113 | unsigned int size = ue->elem_data_size; |
1114 | char *src = ue->elem_data + | |
1115 | snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; | |
1da177e4 | 1116 | |
07f4d9d7 | 1117 | mutex_lock(&ue->card->user_ctl_lock); |
e1c78df1 | 1118 | memcpy(&ucontrol->value, src, size); |
07f4d9d7 | 1119 | mutex_unlock(&ue->card->user_ctl_lock); |
1da177e4 LT |
1120 | return 0; |
1121 | } | |
1122 | ||
82e9bae6 TI |
1123 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
1124 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1125 | { |
1126 | int change; | |
1127 | struct user_element *ue = kcontrol->private_data; | |
e1c78df1 TS |
1128 | unsigned int size = ue->elem_data_size; |
1129 | char *dst = ue->elem_data + | |
1130 | snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; | |
07f4d9d7 LPC |
1131 | |
1132 | mutex_lock(&ue->card->user_ctl_lock); | |
e1c78df1 | 1133 | change = memcmp(&ucontrol->value, dst, size) != 0; |
1da177e4 | 1134 | if (change) |
e1c78df1 | 1135 | memcpy(dst, &ucontrol->value, size); |
07f4d9d7 | 1136 | mutex_unlock(&ue->card->user_ctl_lock); |
1da177e4 LT |
1137 | return change; |
1138 | } | |
1139 | ||
8aa9b586 JK |
1140 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
1141 | int op_flag, | |
1142 | unsigned int size, | |
1143 | unsigned int __user *tlv) | |
1144 | { | |
1145 | struct user_element *ue = kcontrol->private_data; | |
1146 | int change = 0; | |
1147 | void *new_data; | |
1148 | ||
39d11867 | 1149 | if (op_flag == SNDRV_CTL_TLV_OP_WRITE) { |
8aa9b586 JK |
1150 | if (size > 1024 * 128) /* sane value */ |
1151 | return -EINVAL; | |
ef44a1ec LZ |
1152 | |
1153 | new_data = memdup_user(tlv, size); | |
1154 | if (IS_ERR(new_data)) | |
1155 | return PTR_ERR(new_data); | |
07f4d9d7 | 1156 | mutex_lock(&ue->card->user_ctl_lock); |
8aa9b586 JK |
1157 | change = ue->tlv_data_size != size; |
1158 | if (!change) | |
1159 | change = memcmp(ue->tlv_data, new_data, size); | |
1160 | kfree(ue->tlv_data); | |
1161 | ue->tlv_data = new_data; | |
1162 | ue->tlv_data_size = size; | |
07f4d9d7 | 1163 | mutex_unlock(&ue->card->user_ctl_lock); |
8aa9b586 | 1164 | } else { |
07f4d9d7 LPC |
1165 | int ret = 0; |
1166 | ||
1167 | mutex_lock(&ue->card->user_ctl_lock); | |
1168 | if (!ue->tlv_data_size || !ue->tlv_data) { | |
1169 | ret = -ENXIO; | |
1170 | goto err_unlock; | |
1171 | } | |
1172 | if (size < ue->tlv_data_size) { | |
1173 | ret = -ENOSPC; | |
1174 | goto err_unlock; | |
1175 | } | |
8aa9b586 | 1176 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) |
07f4d9d7 LPC |
1177 | ret = -EFAULT; |
1178 | err_unlock: | |
1179 | mutex_unlock(&ue->card->user_ctl_lock); | |
1180 | if (ret) | |
1181 | return ret; | |
8aa9b586 JK |
1182 | } |
1183 | return change; | |
1184 | } | |
1185 | ||
8d448162 CL |
1186 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
1187 | { | |
1188 | char *names, *p; | |
1189 | size_t buf_len, name_len; | |
1190 | unsigned int i; | |
447c6f93 | 1191 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162 CL |
1192 | |
1193 | if (ue->info.value.enumerated.names_length > 64 * 1024) | |
1194 | return -EINVAL; | |
1195 | ||
447c6f93 | 1196 | names = memdup_user((const void __user *)user_ptrval, |
8d448162 CL |
1197 | ue->info.value.enumerated.names_length); |
1198 | if (IS_ERR(names)) | |
1199 | return PTR_ERR(names); | |
1200 | ||
1201 | /* check that there are enough valid names */ | |
1202 | buf_len = ue->info.value.enumerated.names_length; | |
1203 | p = names; | |
1204 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { | |
1205 | name_len = strnlen(p, buf_len); | |
1206 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { | |
1207 | kfree(names); | |
1208 | return -EINVAL; | |
1209 | } | |
1210 | p += name_len + 1; | |
1211 | buf_len -= name_len + 1; | |
1212 | } | |
1213 | ||
1214 | ue->priv_data = names; | |
1215 | ue->info.value.enumerated.names_ptr = 0; | |
1216 | ||
1217 | return 0; | |
1218 | } | |
1219 | ||
82e9bae6 | 1220 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 1221 | { |
8aa9b586 | 1222 | struct user_element *ue = kcontrol->private_data; |
8d448162 CL |
1223 | |
1224 | kfree(ue->tlv_data); | |
1225 | kfree(ue->priv_data); | |
8aa9b586 | 1226 | kfree(ue); |
1da177e4 LT |
1227 | } |
1228 | ||
82e9bae6 TI |
1229 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
1230 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 1231 | { |
4ed56666 TS |
1232 | /* The capacity of struct snd_ctl_elem_value.value.*/ |
1233 | static const unsigned int value_sizes[] = { | |
1234 | [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = sizeof(long), | |
1235 | [SNDRV_CTL_ELEM_TYPE_INTEGER] = sizeof(long), | |
1236 | [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = sizeof(unsigned int), | |
1237 | [SNDRV_CTL_ELEM_TYPE_BYTES] = sizeof(unsigned char), | |
1238 | [SNDRV_CTL_ELEM_TYPE_IEC958] = sizeof(struct snd_aes_iec958), | |
1239 | [SNDRV_CTL_ELEM_TYPE_INTEGER64] = sizeof(long long), | |
1240 | }; | |
1241 | static const unsigned int max_value_counts[] = { | |
1242 | [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = 128, | |
1243 | [SNDRV_CTL_ELEM_TYPE_INTEGER] = 128, | |
1244 | [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = 128, | |
1245 | [SNDRV_CTL_ELEM_TYPE_BYTES] = 512, | |
1246 | [SNDRV_CTL_ELEM_TYPE_IEC958] = 1, | |
1247 | [SNDRV_CTL_ELEM_TYPE_INTEGER64] = 64, | |
1248 | }; | |
82e9bae6 | 1249 | struct snd_card *card = file->card; |
2225e79b TS |
1250 | struct snd_kcontrol *kctl; |
1251 | unsigned int count; | |
1da177e4 LT |
1252 | unsigned int access; |
1253 | long private_size; | |
1254 | struct user_element *ue; | |
cab2ed74 | 1255 | unsigned int offset; |
2225e79b | 1256 | int err; |
82262a46 | 1257 | |
be3bb823 TI |
1258 | if (!*info->id.name) |
1259 | return -EINVAL; | |
1260 | if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name)) | |
1261 | return -EINVAL; | |
82262a46 | 1262 | |
2225e79b | 1263 | /* Delete a control to replace them if needed. */ |
82262a46 | 1264 | if (replace) { |
2225e79b | 1265 | info->id.numid = 0; |
82262a46 LPC |
1266 | err = snd_ctl_remove_user_ctl(file, &info->id); |
1267 | if (err) | |
1268 | return err; | |
1da177e4 | 1269 | } |
82262a46 | 1270 | |
2225e79b TS |
1271 | /* |
1272 | * The number of userspace controls are counted control by control, | |
1273 | * not element by element. | |
1274 | */ | |
1275 | if (card->user_ctl_count + 1 > MAX_USER_CONTROLS) | |
82262a46 LPC |
1276 | return -ENOMEM; |
1277 | ||
2225e79b TS |
1278 | /* Check the number of elements for this userspace control. */ |
1279 | count = info->owner; | |
1280 | if (count == 0) | |
1281 | count = 1; | |
1282 | ||
1283 | /* Arrange access permissions if needed. */ | |
1284 | access = info->access; | |
1285 | if (access == 0) | |
1286 | access = SNDRV_CTL_ELEM_ACCESS_READWRITE; | |
1287 | access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | | |
1288 | SNDRV_CTL_ELEM_ACCESS_INACTIVE | | |
1289 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE); | |
1290 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) | |
8aa9b586 | 1291 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; |
2225e79b | 1292 | access |= SNDRV_CTL_ELEM_ACCESS_USER; |
4ed56666 | 1293 | |
2225e79b TS |
1294 | /* |
1295 | * Check information and calculate the size of data specific to | |
1296 | * this userspace control. | |
1297 | */ | |
4ed56666 TS |
1298 | if (info->type < SNDRV_CTL_ELEM_TYPE_BOOLEAN || |
1299 | info->type > SNDRV_CTL_ELEM_TYPE_INTEGER64) | |
1da177e4 | 1300 | return -EINVAL; |
4ed56666 TS |
1301 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED && |
1302 | info->value.enumerated.items == 0) | |
1303 | return -EINVAL; | |
1304 | if (info->count < 1 || | |
1305 | info->count > max_value_counts[info->type]) | |
1306 | return -EINVAL; | |
860c1994 TS |
1307 | if (!validate_element_member_dimension(info)) |
1308 | return -EINVAL; | |
4ed56666 | 1309 | private_size = value_sizes[info->type] * info->count; |
2225e79b TS |
1310 | |
1311 | /* | |
1312 | * Keep memory object for this userspace control. After passing this | |
1313 | * code block, the instance should be freed by snd_ctl_free_one(). | |
1314 | * | |
1315 | * Note that these elements in this control are locked. | |
1316 | */ | |
1317 | err = snd_ctl_new(&kctl, count, access, file); | |
1318 | if (err < 0) | |
1319 | return err; | |
e79d74ab | 1320 | memcpy(&kctl->id, &info->id, sizeof(kctl->id)); |
e1c78df1 | 1321 | kctl->private_data = kzalloc(sizeof(struct user_element) + private_size * count, |
2225e79b TS |
1322 | GFP_KERNEL); |
1323 | if (kctl->private_data == NULL) { | |
1324 | kfree(kctl); | |
1da177e4 | 1325 | return -ENOMEM; |
2225e79b TS |
1326 | } |
1327 | kctl->private_free = snd_ctl_elem_user_free; | |
1328 | ||
1329 | /* Set private data for this userspace control. */ | |
1330 | ue = (struct user_element *)kctl->private_data; | |
07f4d9d7 | 1331 | ue->card = card; |
1da177e4 | 1332 | ue->info = *info; |
86148e84 | 1333 | ue->info.access = 0; |
1da177e4 LT |
1334 | ue->elem_data = (char *)ue + sizeof(*ue); |
1335 | ue->elem_data_size = private_size; | |
8d448162 CL |
1336 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
1337 | err = snd_ctl_elem_init_enum_names(ue); | |
1338 | if (err < 0) { | |
2225e79b | 1339 | snd_ctl_free_one(kctl); |
8d448162 CL |
1340 | return err; |
1341 | } | |
1342 | } | |
2225e79b TS |
1343 | |
1344 | /* Set callback functions. */ | |
1345 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) | |
1346 | kctl->info = snd_ctl_elem_user_enum_info; | |
1347 | else | |
1348 | kctl->info = snd_ctl_elem_user_info; | |
1349 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
1350 | kctl->get = snd_ctl_elem_user_get; | |
1351 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
1352 | kctl->put = snd_ctl_elem_user_put; | |
1353 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) | |
1354 | kctl->tlv.c = snd_ctl_elem_user_tlv; | |
1355 | ||
1356 | /* This function manage to free the instance on failure. */ | |
1357 | err = snd_ctl_add(card, kctl); | |
2fbf182e | 1358 | if (err < 0) |
1da177e4 | 1359 | return err; |
cab2ed74 TS |
1360 | offset = snd_ctl_get_ioff(kctl, &info->id); |
1361 | snd_ctl_build_ioff(&info->id, kctl, offset); | |
1362 | /* | |
1363 | * Here we cannot fill any field for the number of elements added by | |
1364 | * this operation because there're no specific fields. The usage of | |
1365 | * 'owner' field for this purpose may cause any bugs to userspace | |
1366 | * applications because the field originally means PID of a process | |
1367 | * which locks the element. | |
1368 | */ | |
1da177e4 LT |
1369 | |
1370 | down_write(&card->controls_rwsem); | |
1371 | card->user_ctl_count++; | |
1372 | up_write(&card->controls_rwsem); | |
1373 | ||
1374 | return 0; | |
1375 | } | |
1376 | ||
82e9bae6 TI |
1377 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1378 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1379 | { |
82e9bae6 | 1380 | struct snd_ctl_elem_info info; |
cab2ed74 TS |
1381 | int err; |
1382 | ||
1da177e4 LT |
1383 | if (copy_from_user(&info, _info, sizeof(info))) |
1384 | return -EFAULT; | |
cab2ed74 TS |
1385 | err = snd_ctl_elem_add(file, &info, replace); |
1386 | if (err < 0) | |
1387 | return err; | |
1388 | if (copy_to_user(_info, &info, sizeof(info))) { | |
1389 | snd_ctl_remove_user_ctl(file, &info.id); | |
1390 | return -EFAULT; | |
1391 | } | |
1392 | ||
1393 | return 0; | |
1da177e4 LT |
1394 | } |
1395 | ||
82e9bae6 TI |
1396 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1397 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1398 | { |
82e9bae6 | 1399 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1400 | |
1401 | if (copy_from_user(&id, _id, sizeof(id))) | |
1402 | return -EFAULT; | |
f217ac59 | 1403 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1404 | } |
1405 | ||
82e9bae6 | 1406 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1407 | { |
1408 | int subscribe; | |
1409 | if (get_user(subscribe, ptr)) | |
1410 | return -EFAULT; | |
1411 | if (subscribe < 0) { | |
1412 | subscribe = file->subscribed; | |
1413 | if (put_user(subscribe, ptr)) | |
1414 | return -EFAULT; | |
1415 | return 0; | |
1416 | } | |
1417 | if (subscribe) { | |
1418 | file->subscribed = 1; | |
1419 | return 0; | |
1420 | } else if (file->subscribed) { | |
1421 | snd_ctl_empty_read_queue(file); | |
1422 | file->subscribed = 0; | |
1423 | } | |
1424 | return 0; | |
1425 | } | |
1426 | ||
8aa9b586 JK |
1427 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1428 | struct snd_ctl_tlv __user *_tlv, | |
1429 | int op_flag) | |
42750b04 | 1430 | { |
8aa9b586 | 1431 | struct snd_card *card = file->card; |
42750b04 JK |
1432 | struct snd_ctl_tlv tlv; |
1433 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1434 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1435 | unsigned int len; |
1436 | int err = 0; | |
1437 | ||
1438 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1439 | return -EFAULT; | |
6123637f | 1440 | if (tlv.length < sizeof(unsigned int) * 2) |
8aa9b586 | 1441 | return -EINVAL; |
c0bcdbdf TI |
1442 | if (!tlv.numid) |
1443 | return -EINVAL; | |
8aa9b586 JK |
1444 | down_read(&card->controls_rwsem); |
1445 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1446 | if (kctl == NULL) { | |
1447 | err = -ENOENT; | |
1448 | goto __kctl_end; | |
1449 | } | |
1450 | if (kctl->tlv.p == NULL) { | |
1451 | err = -ENXIO; | |
1452 | goto __kctl_end; | |
1453 | } | |
1454 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
39d11867 TS |
1455 | if ((op_flag == SNDRV_CTL_TLV_OP_READ && |
1456 | (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1457 | (op_flag == SNDRV_CTL_TLV_OP_WRITE && | |
1458 | (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1459 | (op_flag == SNDRV_CTL_TLV_OP_CMD && | |
1460 | (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
8aa9b586 JK |
1461 | err = -ENXIO; |
1462 | goto __kctl_end; | |
1463 | } | |
1464 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
bec145ae | 1465 | if (vd->owner != NULL && vd->owner != file) { |
8aa9b586 JK |
1466 | err = -EPERM; |
1467 | goto __kctl_end; | |
1468 | } | |
bd483d4c | 1469 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); |
8aa9b586 | 1470 | if (err > 0) { |
fd9f26e4 | 1471 | struct snd_ctl_elem_id id = kctl->id; |
8aa9b586 | 1472 | up_read(&card->controls_rwsem); |
fd9f26e4 | 1473 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &id); |
8aa9b586 JK |
1474 | return 0; |
1475 | } | |
1476 | } else { | |
c30cf8cb | 1477 | if (op_flag != SNDRV_CTL_TLV_OP_READ) { |
8aa9b586 JK |
1478 | err = -ENXIO; |
1479 | goto __kctl_end; | |
1480 | } | |
1481 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1482 | if (tlv.length < len) { | |
1483 | err = -ENOMEM; | |
1484 | goto __kctl_end; | |
1485 | } | |
1486 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1487 | err = -EFAULT; | |
1488 | } | |
42750b04 | 1489 | __kctl_end: |
8aa9b586 JK |
1490 | up_read(&card->controls_rwsem); |
1491 | return err; | |
42750b04 JK |
1492 | } |
1493 | ||
1da177e4 LT |
1494 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1495 | { | |
82e9bae6 TI |
1496 | struct snd_ctl_file *ctl; |
1497 | struct snd_card *card; | |
82e9bae6 | 1498 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1499 | void __user *argp = (void __user *)arg; |
1500 | int __user *ip = argp; | |
1501 | int err; | |
1502 | ||
1503 | ctl = file->private_data; | |
1504 | card = ctl->card; | |
7eaa943c TI |
1505 | if (snd_BUG_ON(!card)) |
1506 | return -ENXIO; | |
1da177e4 LT |
1507 | switch (cmd) { |
1508 | case SNDRV_CTL_IOCTL_PVERSION: | |
1509 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1510 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1511 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1512 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1513 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1514 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1515 | return snd_ctl_elem_info_user(ctl, argp); | |
1516 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1517 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1518 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1519 | return snd_ctl_elem_write_user(ctl, argp); | |
1520 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1521 | return snd_ctl_elem_lock(ctl, argp); | |
1522 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1523 | return snd_ctl_elem_unlock(ctl, argp); | |
1524 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1525 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1526 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1527 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1528 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1529 | return snd_ctl_elem_remove(ctl, argp); | |
1530 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1531 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 | 1532 | case SNDRV_CTL_IOCTL_TLV_READ: |
0cea76f3 | 1533 | return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ); |
8aa9b586 | 1534 | case SNDRV_CTL_IOCTL_TLV_WRITE: |
0cea76f3 | 1535 | return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE); |
8aa9b586 | 1536 | case SNDRV_CTL_IOCTL_TLV_COMMAND: |
0cea76f3 | 1537 | return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD); |
1da177e4 | 1538 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1539 | return -ENOPROTOOPT; |
1da177e4 LT |
1540 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1541 | #ifdef CONFIG_PM | |
1542 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1543 | #else | |
1544 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1545 | #endif | |
1546 | } | |
1547 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1548 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1549 | err = p->fioctl(card, ctl, cmd, arg); |
1550 | if (err != -ENOIOCTLCMD) { | |
1551 | up_read(&snd_ioctl_rwsem); | |
1552 | return err; | |
1553 | } | |
1554 | } | |
1555 | up_read(&snd_ioctl_rwsem); | |
bb009457 | 1556 | dev_dbg(card->dev, "unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1557 | return -ENOTTY; |
1558 | } | |
1559 | ||
82e9bae6 TI |
1560 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1561 | size_t count, loff_t * offset) | |
1da177e4 | 1562 | { |
82e9bae6 | 1563 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1564 | int err = 0; |
1565 | ssize_t result = 0; | |
1566 | ||
1567 | ctl = file->private_data; | |
7eaa943c TI |
1568 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1569 | return -ENXIO; | |
1da177e4 LT |
1570 | if (!ctl->subscribed) |
1571 | return -EBADFD; | |
82e9bae6 | 1572 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1573 | return -EINVAL; |
1574 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1575 | while (count >= sizeof(struct snd_ctl_event)) { |
1576 | struct snd_ctl_event ev; | |
1577 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1578 | while (list_empty(&ctl->events)) { |
1579 | wait_queue_t wait; | |
1580 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1581 | err = -EAGAIN; | |
1582 | goto __end_lock; | |
1583 | } | |
1584 | init_waitqueue_entry(&wait, current); | |
1585 | add_wait_queue(&ctl->change_sleep, &wait); | |
1586 | set_current_state(TASK_INTERRUPTIBLE); | |
1587 | spin_unlock_irq(&ctl->read_lock); | |
1588 | schedule(); | |
1589 | remove_wait_queue(&ctl->change_sleep, &wait); | |
0914f796 TI |
1590 | if (ctl->card->shutdown) |
1591 | return -ENODEV; | |
1da177e4 | 1592 | if (signal_pending(current)) |
0e5d720c | 1593 | return -ERESTARTSYS; |
1da177e4 LT |
1594 | spin_lock_irq(&ctl->read_lock); |
1595 | } | |
1596 | kev = snd_kctl_event(ctl->events.next); | |
1597 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1598 | ev.data.elem.mask = kev->mask; | |
1599 | ev.data.elem.id = kev->id; | |
1600 | list_del(&kev->list); | |
1601 | spin_unlock_irq(&ctl->read_lock); | |
1602 | kfree(kev); | |
82e9bae6 | 1603 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1604 | err = -EFAULT; |
1605 | goto __end; | |
1606 | } | |
1607 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1608 | buffer += sizeof(struct snd_ctl_event); |
1609 | count -= sizeof(struct snd_ctl_event); | |
1610 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1611 | } |
1612 | __end_lock: | |
1613 | spin_unlock_irq(&ctl->read_lock); | |
1614 | __end: | |
1615 | return result > 0 ? result : err; | |
1616 | } | |
1617 | ||
1618 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1619 | { | |
1620 | unsigned int mask; | |
82e9bae6 | 1621 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1622 | |
1623 | ctl = file->private_data; | |
1624 | if (!ctl->subscribed) | |
1625 | return 0; | |
1626 | poll_wait(file, &ctl->change_sleep, wait); | |
1627 | ||
1628 | mask = 0; | |
1629 | if (!list_empty(&ctl->events)) | |
1630 | mask |= POLLIN | POLLRDNORM; | |
1631 | ||
1632 | return mask; | |
1633 | } | |
1634 | ||
1635 | /* | |
1636 | * register the device-specific control-ioctls. | |
1637 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1638 | */ | |
1639 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1640 | { | |
82e9bae6 | 1641 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1642 | |
82e9bae6 | 1643 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1644 | if (pn == NULL) |
1645 | return -ENOMEM; | |
1646 | pn->fioctl = fcn; | |
1647 | down_write(&snd_ioctl_rwsem); | |
1648 | list_add_tail(&pn->list, lists); | |
1649 | up_write(&snd_ioctl_rwsem); | |
1650 | return 0; | |
1651 | } | |
1652 | ||
12cddbd8 TI |
1653 | /** |
1654 | * snd_ctl_register_ioctl - register the device-specific control-ioctls | |
1655 | * @fcn: ioctl callback function | |
1656 | * | |
1657 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1658 | */ | |
1da177e4 LT |
1659 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) |
1660 | { | |
1661 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1662 | } | |
c0d3fb39 TI |
1663 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1664 | ||
1da177e4 | 1665 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1666 | /** |
1667 | * snd_ctl_register_ioctl_compat - register the device-specific 32bit compat | |
1668 | * control-ioctls | |
1669 | * @fcn: ioctl callback function | |
1670 | */ | |
1da177e4 LT |
1671 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1672 | { | |
1673 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1674 | } | |
c0d3fb39 | 1675 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); |
1da177e4 LT |
1676 | #endif |
1677 | ||
1678 | /* | |
1679 | * de-register the device-specific control-ioctls. | |
1680 | */ | |
82e9bae6 TI |
1681 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1682 | struct list_head *lists) | |
1da177e4 | 1683 | { |
82e9bae6 | 1684 | struct snd_kctl_ioctl *p; |
1da177e4 | 1685 | |
7eaa943c TI |
1686 | if (snd_BUG_ON(!fcn)) |
1687 | return -EINVAL; | |
1da177e4 | 1688 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1689 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1690 | if (p->fioctl == fcn) { |
1691 | list_del(&p->list); | |
1692 | up_write(&snd_ioctl_rwsem); | |
1693 | kfree(p); | |
1694 | return 0; | |
1695 | } | |
1696 | } | |
1697 | up_write(&snd_ioctl_rwsem); | |
1698 | snd_BUG(); | |
1699 | return -EINVAL; | |
1700 | } | |
1701 | ||
12cddbd8 TI |
1702 | /** |
1703 | * snd_ctl_unregister_ioctl - de-register the device-specific control-ioctls | |
1704 | * @fcn: ioctl callback function to unregister | |
1705 | */ | |
1da177e4 LT |
1706 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) |
1707 | { | |
1708 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1709 | } | |
c0d3fb39 TI |
1710 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1711 | ||
1da177e4 | 1712 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1713 | /** |
1714 | * snd_ctl_unregister_ioctl - de-register the device-specific compat 32bit | |
1715 | * control-ioctls | |
1716 | * @fcn: ioctl callback function to unregister | |
1717 | */ | |
1da177e4 LT |
1718 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1719 | { | |
1720 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1721 | } | |
c0d3fb39 | 1722 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1723 | #endif |
1724 | ||
1725 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1726 | { | |
82e9bae6 | 1727 | struct snd_ctl_file *ctl; |
60aa4924 | 1728 | |
1da177e4 | 1729 | ctl = file->private_data; |
60aa4924 | 1730 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1731 | } |
1732 | ||
23c18d4b TI |
1733 | /* return the preferred subdevice number if already assigned; |
1734 | * otherwise return -1 | |
1735 | */ | |
1736 | int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type) | |
1737 | { | |
1738 | struct snd_ctl_file *kctl; | |
1739 | int subdevice = -1; | |
1740 | ||
1741 | read_lock(&card->ctl_files_rwlock); | |
1742 | list_for_each_entry(kctl, &card->ctl_files, list) { | |
1743 | if (kctl->pid == task_pid(current)) { | |
1744 | subdevice = kctl->preferred_subdevice[type]; | |
1745 | if (subdevice != -1) | |
1746 | break; | |
1747 | } | |
1748 | } | |
1749 | read_unlock(&card->ctl_files_rwlock); | |
1750 | return subdevice; | |
1751 | } | |
1752 | EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice); | |
1753 | ||
1da177e4 LT |
1754 | /* |
1755 | * ioctl32 compat | |
1756 | */ | |
1757 | #ifdef CONFIG_COMPAT | |
1758 | #include "control_compat.c" | |
1759 | #else | |
1760 | #define snd_ctl_ioctl_compat NULL | |
1761 | #endif | |
1762 | ||
1763 | /* | |
1764 | * INIT PART | |
1765 | */ | |
1766 | ||
9c2e08c5 | 1767 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1768 | { |
1769 | .owner = THIS_MODULE, | |
1770 | .read = snd_ctl_read, | |
1771 | .open = snd_ctl_open, | |
1772 | .release = snd_ctl_release, | |
02f4865f | 1773 | .llseek = no_llseek, |
1da177e4 LT |
1774 | .poll = snd_ctl_poll, |
1775 | .unlocked_ioctl = snd_ctl_ioctl, | |
1776 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1777 | .fasync = snd_ctl_fasync, | |
1778 | }; | |
1779 | ||
1da177e4 LT |
1780 | /* |
1781 | * registration of the control device | |
1782 | */ | |
82e9bae6 | 1783 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1784 | { |
82e9bae6 | 1785 | struct snd_card *card = device->device_data; |
1da177e4 | 1786 | |
40a4b263 TI |
1787 | return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1788 | &snd_ctl_f_ops, card, &card->ctl_dev); | |
1da177e4 LT |
1789 | } |
1790 | ||
1791 | /* | |
1792 | * disconnection of the control device | |
1793 | */ | |
82e9bae6 | 1794 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1795 | { |
82e9bae6 | 1796 | struct snd_card *card = device->device_data; |
82e9bae6 | 1797 | struct snd_ctl_file *ctl; |
1da177e4 | 1798 | |
d8009882 | 1799 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1800 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1801 | wake_up(&ctl->change_sleep); |
1802 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1803 | } | |
d8009882 | 1804 | read_unlock(&card->ctl_files_rwlock); |
c461482c | 1805 | |
40a4b263 | 1806 | return snd_unregister_device(&card->ctl_dev); |
1da177e4 LT |
1807 | } |
1808 | ||
1809 | /* | |
1810 | * free all controls | |
1811 | */ | |
82e9bae6 | 1812 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1813 | { |
82e9bae6 TI |
1814 | struct snd_card *card = device->device_data; |
1815 | struct snd_kcontrol *control; | |
1da177e4 LT |
1816 | |
1817 | down_write(&card->controls_rwsem); | |
1818 | while (!list_empty(&card->controls)) { | |
1819 | control = snd_kcontrol(card->controls.next); | |
1820 | snd_ctl_remove(card, control); | |
1821 | } | |
1822 | up_write(&card->controls_rwsem); | |
0fcd9f4b | 1823 | put_device(&card->ctl_dev); |
1da177e4 LT |
1824 | return 0; |
1825 | } | |
1826 | ||
1da177e4 LT |
1827 | /* |
1828 | * create control core: | |
1829 | * called from init.c | |
1830 | */ | |
82e9bae6 | 1831 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1832 | { |
82e9bae6 | 1833 | static struct snd_device_ops ops = { |
1da177e4 LT |
1834 | .dev_free = snd_ctl_dev_free, |
1835 | .dev_register = snd_ctl_dev_register, | |
1836 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 | 1837 | }; |
0fcd9f4b | 1838 | int err; |
1da177e4 | 1839 | |
7eaa943c TI |
1840 | if (snd_BUG_ON(!card)) |
1841 | return -ENXIO; | |
0fcd9f4b TI |
1842 | if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS)) |
1843 | return -ENXIO; | |
1844 | ||
1845 | snd_device_initialize(&card->ctl_dev, card); | |
1846 | dev_set_name(&card->ctl_dev, "controlC%d", card->number); | |
1847 | ||
1848 | err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1849 | if (err < 0) | |
1850 | put_device(&card->ctl_dev); | |
1851 | return err; | |
1da177e4 | 1852 | } |
b9ed4f2b TI |
1853 | |
1854 | /* | |
9600732b | 1855 | * Frequently used control callbacks/helpers |
b9ed4f2b | 1856 | */ |
12cddbd8 TI |
1857 | |
1858 | /** | |
1859 | * snd_ctl_boolean_mono_info - Helper function for a standard boolean info | |
1860 | * callback with a mono channel | |
1861 | * @kcontrol: the kcontrol instance | |
1862 | * @uinfo: info to store | |
1863 | * | |
1864 | * This is a function that can be used as info callback for a standard | |
1865 | * boolean control with a single mono channel. | |
1866 | */ | |
b9ed4f2b TI |
1867 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, |
1868 | struct snd_ctl_elem_info *uinfo) | |
1869 | { | |
1870 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1871 | uinfo->count = 1; | |
1872 | uinfo->value.integer.min = 0; | |
1873 | uinfo->value.integer.max = 1; | |
1874 | return 0; | |
1875 | } | |
b9ed4f2b TI |
1876 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); |
1877 | ||
12cddbd8 TI |
1878 | /** |
1879 | * snd_ctl_boolean_stereo_info - Helper function for a standard boolean info | |
1880 | * callback with stereo two channels | |
1881 | * @kcontrol: the kcontrol instance | |
1882 | * @uinfo: info to store | |
1883 | * | |
1884 | * This is a function that can be used as info callback for a standard | |
1885 | * boolean control with stereo two channels. | |
1886 | */ | |
b9ed4f2b TI |
1887 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, |
1888 | struct snd_ctl_elem_info *uinfo) | |
1889 | { | |
1890 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1891 | uinfo->count = 2; | |
1892 | uinfo->value.integer.min = 0; | |
1893 | uinfo->value.integer.max = 1; | |
1894 | return 0; | |
1895 | } | |
b9ed4f2b | 1896 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |
9600732b CL |
1897 | |
1898 | /** | |
1899 | * snd_ctl_enum_info - fills the info structure for an enumerated control | |
1900 | * @info: the structure to be filled | |
1901 | * @channels: the number of the control's channels; often one | |
1902 | * @items: the number of control values; also the size of @names | |
1903 | * @names: an array containing the names of all control values | |
1904 | * | |
1905 | * Sets all required fields in @info to their appropriate values. | |
1906 | * If the control's accessibility is not the default (readable and writable), | |
1907 | * the caller has to fill @info->access. | |
eb7c06e8 YB |
1908 | * |
1909 | * Return: Zero. | |
9600732b CL |
1910 | */ |
1911 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, | |
1912 | unsigned int items, const char *const names[]) | |
1913 | { | |
1914 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; | |
1915 | info->count = channels; | |
1916 | info->value.enumerated.items = items; | |
a7e6fb99 TI |
1917 | if (!items) |
1918 | return 0; | |
9600732b CL |
1919 | if (info->value.enumerated.item >= items) |
1920 | info->value.enumerated.item = items - 1; | |
df803e13 TI |
1921 | WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name), |
1922 | "ALSA: too long item name '%s'\n", | |
1923 | names[info->value.enumerated.item]); | |
9600732b CL |
1924 | strlcpy(info->value.enumerated.name, |
1925 | names[info->value.enumerated.item], | |
1926 | sizeof(info->value.enumerated.name)); | |
1927 | return 0; | |
1928 | } | |
1929 | EXPORT_SYMBOL(snd_ctl_enum_info); |