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> | |
174cd4b1 | 28 | #include <linux/sched/signal.h> |
1da177e4 LT |
29 | #include <sound/core.h> |
30 | #include <sound/minors.h> | |
31 | #include <sound/info.h> | |
32 | #include <sound/control.h> | |
33 | ||
34 | /* max number of user-defined controls */ | |
35 | #define MAX_USER_CONTROLS 32 | |
5591bf07 | 36 | #define MAX_CONTROL_COUNT 1028 |
1da177e4 | 37 | |
82e9bae6 | 38 | struct snd_kctl_ioctl { |
1da177e4 LT |
39 | struct list_head list; /* list of all ioctls */ |
40 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 41 | }; |
1da177e4 LT |
42 | |
43 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
44 | static LIST_HEAD(snd_control_ioctls); | |
45 | #ifdef CONFIG_COMPAT | |
46 | static LIST_HEAD(snd_control_compat_ioctls); | |
47 | #endif | |
48 | ||
49 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
50 | { | |
1da177e4 | 51 | unsigned long flags; |
82e9bae6 TI |
52 | struct snd_card *card; |
53 | struct snd_ctl_file *ctl; | |
23c18d4b | 54 | int i, err; |
1da177e4 | 55 | |
02f4865f TI |
56 | err = nonseekable_open(inode, file); |
57 | if (err < 0) | |
58 | return err; | |
59 | ||
f87135f5 | 60 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
61 | if (!card) { |
62 | err = -ENODEV; | |
63 | goto __error1; | |
64 | } | |
65 | err = snd_card_file_add(card, file); | |
66 | if (err < 0) { | |
67 | err = -ENODEV; | |
68 | goto __error1; | |
69 | } | |
70 | if (!try_module_get(card->module)) { | |
71 | err = -EFAULT; | |
72 | goto __error2; | |
73 | } | |
ca2c0966 | 74 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
75 | if (ctl == NULL) { |
76 | err = -ENOMEM; | |
77 | goto __error; | |
78 | } | |
79 | INIT_LIST_HEAD(&ctl->events); | |
80 | init_waitqueue_head(&ctl->change_sleep); | |
81 | spin_lock_init(&ctl->read_lock); | |
82 | ctl->card = card; | |
23c18d4b TI |
83 | for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++) |
84 | ctl->preferred_subdevice[i] = -1; | |
25d27ede | 85 | ctl->pid = get_pid(task_pid(current)); |
1da177e4 LT |
86 | file->private_data = ctl; |
87 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
88 | list_add_tail(&ctl->list, &card->ctl_files); | |
89 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
a0830dbd | 90 | snd_card_unref(card); |
1da177e4 LT |
91 | return 0; |
92 | ||
93 | __error: | |
94 | module_put(card->module); | |
95 | __error2: | |
96 | snd_card_file_remove(card, file); | |
97 | __error1: | |
a0830dbd TI |
98 | if (card) |
99 | snd_card_unref(card); | |
1da177e4 LT |
100 | return err; |
101 | } | |
102 | ||
82e9bae6 | 103 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 104 | { |
7507e8da | 105 | unsigned long flags; |
82e9bae6 | 106 | struct snd_kctl_event *cread; |
1da177e4 | 107 | |
7507e8da | 108 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
109 | while (!list_empty(&ctl->events)) { |
110 | cread = snd_kctl_event(ctl->events.next); | |
111 | list_del(&cread->list); | |
112 | kfree(cread); | |
113 | } | |
7507e8da | 114 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
115 | } |
116 | ||
117 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
118 | { | |
119 | unsigned long flags; | |
82e9bae6 TI |
120 | struct snd_card *card; |
121 | struct snd_ctl_file *ctl; | |
122 | struct snd_kcontrol *control; | |
1da177e4 LT |
123 | unsigned int idx; |
124 | ||
125 | ctl = file->private_data; | |
1da177e4 LT |
126 | file->private_data = NULL; |
127 | card = ctl->card; | |
128 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
129 | list_del(&ctl->list); | |
130 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
131 | down_write(&card->controls_rwsem); | |
9244b2c3 | 132 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
133 | for (idx = 0; idx < control->count; idx++) |
134 | if (control->vd[idx].owner == ctl) | |
135 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
136 | up_write(&card->controls_rwsem); |
137 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 138 | put_pid(ctl->pid); |
1da177e4 LT |
139 | kfree(ctl); |
140 | module_put(card->module); | |
141 | snd_card_file_remove(card, file); | |
142 | return 0; | |
143 | } | |
144 | ||
12cddbd8 TI |
145 | /** |
146 | * snd_ctl_notify - Send notification to user-space for a control change | |
147 | * @card: the card to send notification | |
148 | * @mask: the event mask, SNDRV_CTL_EVENT_* | |
149 | * @id: the ctl element id to send notification | |
150 | * | |
151 | * This function adds an event record with the given id and mask, appends | |
152 | * to the list and wakes up the user-space for notification. This can be | |
153 | * called in the atomic context. | |
154 | */ | |
82e9bae6 TI |
155 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
156 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
157 | { |
158 | unsigned long flags; | |
82e9bae6 TI |
159 | struct snd_ctl_file *ctl; |
160 | struct snd_kctl_event *ev; | |
1da177e4 | 161 | |
7eaa943c TI |
162 | if (snd_BUG_ON(!card || !id)) |
163 | return; | |
f388cdcd TI |
164 | if (card->shutdown) |
165 | return; | |
1da177e4 | 166 | read_lock(&card->ctl_files_rwlock); |
8eeaa2f9 | 167 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
168 | card->mixer_oss_change_count++; |
169 | #endif | |
9244b2c3 | 170 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
171 | if (!ctl->subscribed) |
172 | continue; | |
173 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 174 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
175 | if (ev->id.numid == id->numid) { |
176 | ev->mask |= mask; | |
177 | goto _found; | |
178 | } | |
179 | } | |
ca2c0966 | 180 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
181 | if (ev) { |
182 | ev->id = *id; | |
183 | ev->mask = mask; | |
184 | list_add_tail(&ev->list, &ctl->events); | |
185 | } else { | |
bb009457 | 186 | dev_err(card->dev, "No memory available to allocate event\n"); |
1da177e4 LT |
187 | } |
188 | _found: | |
189 | wake_up(&ctl->change_sleep); | |
190 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
191 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
192 | } | |
193 | read_unlock(&card->ctl_files_rwlock); | |
194 | } | |
c0d3fb39 TI |
195 | EXPORT_SYMBOL(snd_ctl_notify); |
196 | ||
1da177e4 | 197 | /** |
2225e79b TS |
198 | * snd_ctl_new - create a new control instance with some elements |
199 | * @kctl: the pointer to store new control instance | |
200 | * @count: the number of elements in this control | |
201 | * @access: the default access flags for elements in this control | |
202 | * @file: given when locking these elements | |
1da177e4 | 203 | * |
2225e79b TS |
204 | * Allocates a memory object for a new control instance. The instance has |
205 | * elements as many as the given number (@count). Each element has given | |
206 | * access permissions (@access). Each element is locked when @file is given. | |
1da177e4 | 207 | * |
2225e79b | 208 | * Return: 0 on success, error code on failure |
1da177e4 | 209 | */ |
2225e79b TS |
210 | static int snd_ctl_new(struct snd_kcontrol **kctl, unsigned int count, |
211 | unsigned int access, struct snd_ctl_file *file) | |
1da177e4 | 212 | { |
2225e79b | 213 | unsigned int size; |
1da177e4 LT |
214 | unsigned int idx; |
215 | ||
2225e79b TS |
216 | if (count == 0 || count > MAX_CONTROL_COUNT) |
217 | return -EINVAL; | |
5591bf07 | 218 | |
2225e79b TS |
219 | size = sizeof(struct snd_kcontrol); |
220 | size += sizeof(struct snd_kcontrol_volatile) * count; | |
5591bf07 | 221 | |
2225e79b | 222 | *kctl = kzalloc(size, GFP_KERNEL); |
ec0e9937 | 223 | if (!*kctl) |
2225e79b | 224 | return -ENOMEM; |
2225e79b TS |
225 | |
226 | for (idx = 0; idx < count; idx++) { | |
227 | (*kctl)->vd[idx].access = access; | |
228 | (*kctl)->vd[idx].owner = file; | |
229 | } | |
230 | (*kctl)->count = count; | |
231 | ||
232 | return 0; | |
1da177e4 LT |
233 | } |
234 | ||
235 | /** | |
236 | * snd_ctl_new1 - create a control instance from the template | |
237 | * @ncontrol: the initialization record | |
238 | * @private_data: the private data to set | |
239 | * | |
82e9bae6 | 240 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
241 | * template. When the access field of ncontrol is 0, it's assumed as |
242 | * READWRITE access. When the count field is 0, it's assumes as one. | |
243 | * | |
eb7c06e8 | 244 | * Return: The pointer of the newly generated instance, or %NULL on failure. |
1da177e4 | 245 | */ |
82e9bae6 TI |
246 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
247 | void *private_data) | |
1da177e4 | 248 | { |
2225e79b TS |
249 | struct snd_kcontrol *kctl; |
250 | unsigned int count; | |
1da177e4 | 251 | unsigned int access; |
2225e79b | 252 | int err; |
1da177e4 | 253 | |
7eaa943c TI |
254 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
255 | return NULL; | |
2225e79b TS |
256 | |
257 | count = ncontrol->count; | |
258 | if (count == 0) | |
259 | count = 1; | |
260 | ||
261 | access = ncontrol->access; | |
262 | if (access == 0) | |
263 | access = SNDRV_CTL_ELEM_ACCESS_READWRITE; | |
264 | access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | | |
265 | SNDRV_CTL_ELEM_ACCESS_VOLATILE | | |
266 | SNDRV_CTL_ELEM_ACCESS_INACTIVE | | |
267 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE | | |
268 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND | | |
269 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK); | |
270 | ||
271 | err = snd_ctl_new(&kctl, count, access, NULL); | |
272 | if (err < 0) | |
273 | return NULL; | |
274 | ||
275 | /* The 'numid' member is decided when calling snd_ctl_add(). */ | |
276 | kctl->id.iface = ncontrol->iface; | |
277 | kctl->id.device = ncontrol->device; | |
278 | kctl->id.subdevice = ncontrol->subdevice; | |
366840d7 | 279 | if (ncontrol->name) { |
2225e79b TS |
280 | strlcpy(kctl->id.name, ncontrol->name, sizeof(kctl->id.name)); |
281 | if (strcmp(ncontrol->name, kctl->id.name) != 0) | |
bb009457 | 282 | pr_warn("ALSA: Control name '%s' truncated to '%s'\n", |
2225e79b | 283 | ncontrol->name, kctl->id.name); |
366840d7 | 284 | } |
2225e79b TS |
285 | kctl->id.index = ncontrol->index; |
286 | ||
287 | kctl->info = ncontrol->info; | |
288 | kctl->get = ncontrol->get; | |
289 | kctl->put = ncontrol->put; | |
290 | kctl->tlv.p = ncontrol->tlv.p; | |
291 | ||
292 | kctl->private_value = ncontrol->private_value; | |
293 | kctl->private_data = private_data; | |
294 | ||
295 | return kctl; | |
1da177e4 | 296 | } |
c0d3fb39 TI |
297 | EXPORT_SYMBOL(snd_ctl_new1); |
298 | ||
1da177e4 LT |
299 | /** |
300 | * snd_ctl_free_one - release the control instance | |
301 | * @kcontrol: the control instance | |
302 | * | |
303 | * Releases the control instance created via snd_ctl_new() | |
304 | * or snd_ctl_new1(). | |
305 | * Don't call this after the control was added to the card. | |
306 | */ | |
82e9bae6 | 307 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
308 | { |
309 | if (kcontrol) { | |
310 | if (kcontrol->private_free) | |
311 | kcontrol->private_free(kcontrol); | |
312 | kfree(kcontrol); | |
313 | } | |
314 | } | |
c0d3fb39 TI |
315 | EXPORT_SYMBOL(snd_ctl_free_one); |
316 | ||
0e82e5fa CL |
317 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
318 | unsigned int count) | |
1da177e4 | 319 | { |
82e9bae6 | 320 | struct snd_kcontrol *kctl; |
1da177e4 | 321 | |
ac902c11 LPC |
322 | /* Make sure that the ids assigned to the control do not wrap around */ |
323 | if (card->last_numid >= UINT_MAX - count) | |
324 | card->last_numid = 0; | |
325 | ||
9244b2c3 | 326 | list_for_each_entry(kctl, &card->controls, list) { |
7c733587 | 327 | if (kctl->id.numid < card->last_numid + 1 + count && |
0e82e5fa CL |
328 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
329 | card->last_numid = kctl->id.numid + kctl->count - 1; | |
330 | return true; | |
331 | } | |
1da177e4 | 332 | } |
0e82e5fa | 333 | return false; |
1da177e4 LT |
334 | } |
335 | ||
82e9bae6 | 336 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 | 337 | { |
0e82e5fa | 338 | unsigned int iter = 100000; |
1da177e4 | 339 | |
0e82e5fa | 340 | while (snd_ctl_remove_numid_conflict(card, count)) { |
1da177e4 LT |
341 | if (--iter == 0) { |
342 | /* this situation is very unlikely */ | |
bb009457 | 343 | dev_err(card->dev, "unable to allocate new control numid\n"); |
1da177e4 LT |
344 | return -ENOMEM; |
345 | } | |
1da177e4 LT |
346 | } |
347 | return 0; | |
348 | } | |
349 | ||
350 | /** | |
351 | * snd_ctl_add - add the control instance to the card | |
352 | * @card: the card instance | |
353 | * @kcontrol: the control instance to add | |
354 | * | |
355 | * Adds the control instance created via snd_ctl_new() or | |
356 | * snd_ctl_new1() to the given card. Assigns also an unique | |
357 | * numid used for fast search. | |
358 | * | |
1da177e4 | 359 | * It frees automatically the control which cannot be added. |
eb7c06e8 YB |
360 | * |
361 | * Return: Zero if successful, or a negative error code on failure. | |
362 | * | |
1da177e4 | 363 | */ |
82e9bae6 | 364 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 365 | { |
82e9bae6 | 366 | struct snd_ctl_elem_id id; |
1da177e4 | 367 | unsigned int idx; |
fd9f26e4 | 368 | unsigned int count; |
c6077b30 | 369 | int err = -EINVAL; |
1da177e4 | 370 | |
73e77ba0 | 371 | if (! kcontrol) |
c6077b30 | 372 | return err; |
7eaa943c TI |
373 | if (snd_BUG_ON(!card || !kcontrol->info)) |
374 | goto error; | |
1da177e4 | 375 | id = kcontrol->id; |
883a1d49 LPC |
376 | if (id.index > UINT_MAX - kcontrol->count) |
377 | goto error; | |
378 | ||
1da177e4 LT |
379 | down_write(&card->controls_rwsem); |
380 | if (snd_ctl_find_id(card, &id)) { | |
381 | up_write(&card->controls_rwsem); | |
bb009457 | 382 | dev_err(card->dev, "control %i:%i:%i:%s:%i is already present\n", |
1da177e4 LT |
383 | id.iface, |
384 | id.device, | |
385 | id.subdevice, | |
386 | id.name, | |
387 | id.index); | |
c6077b30 TI |
388 | err = -EBUSY; |
389 | goto error; | |
1da177e4 LT |
390 | } |
391 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
392 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
393 | err = -ENOMEM; |
394 | goto error; | |
1da177e4 LT |
395 | } |
396 | list_add_tail(&kcontrol->list, &card->controls); | |
397 | card->controls_count += kcontrol->count; | |
398 | kcontrol->id.numid = card->last_numid + 1; | |
399 | card->last_numid += kcontrol->count; | |
d34890cf | 400 | id = kcontrol->id; |
fd9f26e4 | 401 | count = kcontrol->count; |
1da177e4 | 402 | up_write(&card->controls_rwsem); |
fd9f26e4 | 403 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
1da177e4 LT |
404 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
405 | return 0; | |
c6077b30 TI |
406 | |
407 | error: | |
408 | snd_ctl_free_one(kcontrol); | |
409 | return err; | |
1da177e4 | 410 | } |
c0d3fb39 TI |
411 | EXPORT_SYMBOL(snd_ctl_add); |
412 | ||
66b5b972 DP |
413 | /** |
414 | * snd_ctl_replace - replace the control instance of the card | |
415 | * @card: the card instance | |
416 | * @kcontrol: the control instance to replace | |
417 | * @add_on_replace: add the control if not already added | |
418 | * | |
419 | * Replaces the given control. If the given control does not exist | |
420 | * and the add_on_replace flag is set, the control is added. If the | |
421 | * control exists, it is destroyed first. | |
422 | * | |
66b5b972 | 423 | * It frees automatically the control which cannot be added or replaced. |
eb7c06e8 YB |
424 | * |
425 | * Return: Zero if successful, or a negative error code on failure. | |
66b5b972 DP |
426 | */ |
427 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, | |
428 | bool add_on_replace) | |
429 | { | |
430 | struct snd_ctl_elem_id id; | |
fd9f26e4 | 431 | unsigned int count; |
66b5b972 DP |
432 | unsigned int idx; |
433 | struct snd_kcontrol *old; | |
434 | int ret; | |
435 | ||
436 | if (!kcontrol) | |
437 | return -EINVAL; | |
438 | if (snd_BUG_ON(!card || !kcontrol->info)) { | |
439 | ret = -EINVAL; | |
440 | goto error; | |
441 | } | |
442 | id = kcontrol->id; | |
443 | down_write(&card->controls_rwsem); | |
444 | old = snd_ctl_find_id(card, &id); | |
445 | if (!old) { | |
446 | if (add_on_replace) | |
447 | goto add; | |
448 | up_write(&card->controls_rwsem); | |
449 | ret = -EINVAL; | |
450 | goto error; | |
451 | } | |
452 | ret = snd_ctl_remove(card, old); | |
453 | if (ret < 0) { | |
454 | up_write(&card->controls_rwsem); | |
455 | goto error; | |
456 | } | |
457 | add: | |
458 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
459 | up_write(&card->controls_rwsem); | |
460 | ret = -ENOMEM; | |
461 | goto error; | |
462 | } | |
463 | list_add_tail(&kcontrol->list, &card->controls); | |
464 | card->controls_count += kcontrol->count; | |
465 | kcontrol->id.numid = card->last_numid + 1; | |
466 | card->last_numid += kcontrol->count; | |
e6ff3840 | 467 | id = kcontrol->id; |
fd9f26e4 | 468 | count = kcontrol->count; |
66b5b972 | 469 | up_write(&card->controls_rwsem); |
fd9f26e4 | 470 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
66b5b972 DP |
471 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
472 | return 0; | |
473 | ||
474 | error: | |
475 | snd_ctl_free_one(kcontrol); | |
476 | return ret; | |
477 | } | |
478 | EXPORT_SYMBOL(snd_ctl_replace); | |
479 | ||
1da177e4 LT |
480 | /** |
481 | * snd_ctl_remove - remove the control from the card and release it | |
482 | * @card: the card instance | |
483 | * @kcontrol: the control instance to remove | |
484 | * | |
485 | * Removes the control from the card and then releases the instance. | |
486 | * You don't need to call snd_ctl_free_one(). You must be in | |
487 | * the write lock - down_write(&card->controls_rwsem). | |
eb7c06e8 YB |
488 | * |
489 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 490 | */ |
82e9bae6 | 491 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 492 | { |
82e9bae6 | 493 | struct snd_ctl_elem_id id; |
1da177e4 LT |
494 | unsigned int idx; |
495 | ||
7eaa943c TI |
496 | if (snd_BUG_ON(!card || !kcontrol)) |
497 | return -EINVAL; | |
1da177e4 LT |
498 | list_del(&kcontrol->list); |
499 | card->controls_count -= kcontrol->count; | |
500 | id = kcontrol->id; | |
501 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
502 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
503 | snd_ctl_free_one(kcontrol); | |
504 | return 0; | |
505 | } | |
c0d3fb39 TI |
506 | EXPORT_SYMBOL(snd_ctl_remove); |
507 | ||
1da177e4 LT |
508 | /** |
509 | * snd_ctl_remove_id - remove the control of the given id and release it | |
510 | * @card: the card instance | |
511 | * @id: the control id to remove | |
512 | * | |
513 | * Finds the control instance with the given id, removes it from the | |
514 | * card list and releases it. | |
eb7c06e8 YB |
515 | * |
516 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 517 | */ |
82e9bae6 | 518 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 519 | { |
82e9bae6 | 520 | struct snd_kcontrol *kctl; |
1da177e4 LT |
521 | int ret; |
522 | ||
523 | down_write(&card->controls_rwsem); | |
524 | kctl = snd_ctl_find_id(card, id); | |
525 | if (kctl == NULL) { | |
526 | up_write(&card->controls_rwsem); | |
527 | return -ENOENT; | |
528 | } | |
529 | ret = snd_ctl_remove(card, kctl); | |
530 | up_write(&card->controls_rwsem); | |
531 | return ret; | |
532 | } | |
c0d3fb39 TI |
533 | EXPORT_SYMBOL(snd_ctl_remove_id); |
534 | ||
1da177e4 | 535 | /** |
f217ac59 | 536 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
537 | * @file: active control handle |
538 | * @id: the control id to remove | |
539 | * | |
540 | * Finds the control instance with the given id, removes it from the | |
541 | * card list and releases it. | |
eb7c06e8 YB |
542 | * |
543 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 544 | */ |
f217ac59 CL |
545 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
546 | struct snd_ctl_elem_id *id) | |
1da177e4 | 547 | { |
82e9bae6 TI |
548 | struct snd_card *card = file->card; |
549 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
550 | int idx, ret; |
551 | ||
552 | down_write(&card->controls_rwsem); | |
553 | kctl = snd_ctl_find_id(card, id); | |
554 | if (kctl == NULL) { | |
317b8081 CL |
555 | ret = -ENOENT; |
556 | goto error; | |
1da177e4 | 557 | } |
18dd0aa5 CL |
558 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
559 | ret = -EINVAL; | |
560 | goto error; | |
561 | } | |
1da177e4 LT |
562 | for (idx = 0; idx < kctl->count; idx++) |
563 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
564 | ret = -EBUSY; |
565 | goto error; | |
1da177e4 LT |
566 | } |
567 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
568 | if (ret < 0) |
569 | goto error; | |
570 | card->user_ctl_count--; | |
317b8081 | 571 | error: |
1da177e4 LT |
572 | up_write(&card->controls_rwsem); |
573 | return ret; | |
574 | } | |
575 | ||
3cbdd753 TI |
576 | /** |
577 | * snd_ctl_activate_id - activate/inactivate the control of the given id | |
578 | * @card: the card instance | |
579 | * @id: the control id to activate/inactivate | |
580 | * @active: non-zero to activate | |
581 | * | |
582 | * Finds the control instance with the given id, and activate or | |
583 | * inactivate the control together with notification, if changed. | |
c78497e0 | 584 | * The given ID data is filled with full information. |
3cbdd753 | 585 | * |
eb7c06e8 | 586 | * Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
3cbdd753 TI |
587 | */ |
588 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, | |
589 | int active) | |
590 | { | |
591 | struct snd_kcontrol *kctl; | |
592 | struct snd_kcontrol_volatile *vd; | |
593 | unsigned int index_offset; | |
594 | int ret; | |
595 | ||
596 | down_write(&card->controls_rwsem); | |
597 | kctl = snd_ctl_find_id(card, id); | |
598 | if (kctl == NULL) { | |
599 | ret = -ENOENT; | |
600 | goto unlock; | |
601 | } | |
31584ed1 | 602 | index_offset = snd_ctl_get_ioff(kctl, id); |
3cbdd753 TI |
603 | vd = &kctl->vd[index_offset]; |
604 | ret = 0; | |
605 | if (active) { | |
606 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) | |
607 | goto unlock; | |
608 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
609 | } else { | |
610 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) | |
611 | goto unlock; | |
612 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
613 | } | |
c78497e0 | 614 | snd_ctl_build_ioff(id, kctl, index_offset); |
3cbdd753 TI |
615 | ret = 1; |
616 | unlock: | |
617 | up_write(&card->controls_rwsem); | |
618 | if (ret > 0) | |
619 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); | |
620 | return ret; | |
621 | } | |
622 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); | |
623 | ||
1da177e4 LT |
624 | /** |
625 | * snd_ctl_rename_id - replace the id of a control on the card | |
626 | * @card: the card instance | |
627 | * @src_id: the old id | |
628 | * @dst_id: the new id | |
629 | * | |
630 | * Finds the control with the old id from the card, and replaces the | |
631 | * id with the new one. | |
632 | * | |
eb7c06e8 | 633 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 634 | */ |
82e9bae6 TI |
635 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
636 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 637 | { |
82e9bae6 | 638 | struct snd_kcontrol *kctl; |
1da177e4 LT |
639 | |
640 | down_write(&card->controls_rwsem); | |
641 | kctl = snd_ctl_find_id(card, src_id); | |
642 | if (kctl == NULL) { | |
643 | up_write(&card->controls_rwsem); | |
644 | return -ENOENT; | |
645 | } | |
646 | kctl->id = *dst_id; | |
647 | kctl->id.numid = card->last_numid + 1; | |
648 | card->last_numid += kctl->count; | |
649 | up_write(&card->controls_rwsem); | |
650 | return 0; | |
651 | } | |
c0d3fb39 TI |
652 | EXPORT_SYMBOL(snd_ctl_rename_id); |
653 | ||
1da177e4 LT |
654 | /** |
655 | * snd_ctl_find_numid - find the control instance with the given number-id | |
656 | * @card: the card instance | |
657 | * @numid: the number-id to search | |
658 | * | |
659 | * Finds the control instance with the given number-id from the card. | |
660 | * | |
1da177e4 LT |
661 | * The caller must down card->controls_rwsem before calling this function |
662 | * (if the race condition can happen). | |
eb7c06e8 YB |
663 | * |
664 | * Return: The pointer of the instance if found, or %NULL if not. | |
665 | * | |
1da177e4 | 666 | */ |
82e9bae6 | 667 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 668 | { |
82e9bae6 | 669 | struct snd_kcontrol *kctl; |
1da177e4 | 670 | |
7eaa943c TI |
671 | if (snd_BUG_ON(!card || !numid)) |
672 | return NULL; | |
9244b2c3 | 673 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
674 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
675 | return kctl; | |
676 | } | |
677 | return NULL; | |
678 | } | |
c0d3fb39 TI |
679 | EXPORT_SYMBOL(snd_ctl_find_numid); |
680 | ||
1da177e4 LT |
681 | /** |
682 | * snd_ctl_find_id - find the control instance with the given id | |
683 | * @card: the card instance | |
684 | * @id: the id to search | |
685 | * | |
686 | * Finds the control instance with the given id from the card. | |
687 | * | |
1da177e4 LT |
688 | * The caller must down card->controls_rwsem before calling this function |
689 | * (if the race condition can happen). | |
eb7c06e8 YB |
690 | * |
691 | * Return: The pointer of the instance if found, or %NULL if not. | |
692 | * | |
1da177e4 | 693 | */ |
82e9bae6 TI |
694 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
695 | struct snd_ctl_elem_id *id) | |
1da177e4 | 696 | { |
82e9bae6 | 697 | struct snd_kcontrol *kctl; |
1da177e4 | 698 | |
7eaa943c TI |
699 | if (snd_BUG_ON(!card || !id)) |
700 | return NULL; | |
1da177e4 LT |
701 | if (id->numid != 0) |
702 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 703 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
704 | if (kctl->id.iface != id->iface) |
705 | continue; | |
706 | if (kctl->id.device != id->device) | |
707 | continue; | |
708 | if (kctl->id.subdevice != id->subdevice) | |
709 | continue; | |
710 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
711 | continue; | |
712 | if (kctl->id.index > id->index) | |
713 | continue; | |
714 | if (kctl->id.index + kctl->count <= id->index) | |
715 | continue; | |
716 | return kctl; | |
717 | } | |
718 | return NULL; | |
719 | } | |
c0d3fb39 TI |
720 | EXPORT_SYMBOL(snd_ctl_find_id); |
721 | ||
82e9bae6 | 722 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
723 | unsigned int cmd, void __user *arg) |
724 | { | |
82e9bae6 | 725 | struct snd_ctl_card_info *info; |
1da177e4 | 726 | |
ca2c0966 | 727 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
728 | if (! info) |
729 | return -ENOMEM; | |
730 | down_read(&snd_ioctl_rwsem); | |
731 | info->card = card->number; | |
732 | strlcpy(info->id, card->id, sizeof(info->id)); | |
733 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
734 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
735 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
736 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
737 | strlcpy(info->components, card->components, sizeof(info->components)); | |
738 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 739 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
740 | kfree(info); |
741 | return -EFAULT; | |
742 | } | |
743 | kfree(info); | |
744 | return 0; | |
745 | } | |
746 | ||
82e9bae6 TI |
747 | static int snd_ctl_elem_list(struct snd_card *card, |
748 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 | 749 | { |
82e9bae6 TI |
750 | struct snd_ctl_elem_list list; |
751 | struct snd_kcontrol *kctl; | |
53e7bf45 | 752 | struct snd_ctl_elem_id id; |
78fa2c4d | 753 | unsigned int offset, space, jidx; |
53e7bf45 | 754 | int err = 0; |
1da177e4 LT |
755 | |
756 | if (copy_from_user(&list, _list, sizeof(list))) | |
757 | return -EFAULT; | |
758 | offset = list.offset; | |
759 | space = list.space; | |
4e361d3c | 760 | |
53e7bf45 TI |
761 | down_read(&card->controls_rwsem); |
762 | list.count = card->controls_count; | |
763 | list.used = 0; | |
1da177e4 | 764 | if (space > 0) { |
53e7bf45 TI |
765 | list_for_each_entry(kctl, &card->controls, list) { |
766 | if (offset >= kctl->count) { | |
767 | offset -= kctl->count; | |
768 | continue; | |
769 | } | |
770 | for (jidx = offset; jidx < kctl->count; jidx++) { | |
771 | snd_ctl_build_ioff(&id, kctl, jidx); | |
772 | if (copy_to_user(list.pids + list.used, &id, | |
773 | sizeof(id))) { | |
774 | err = -EFAULT; | |
775 | goto out; | |
776 | } | |
1da177e4 | 777 | list.used++; |
53e7bf45 TI |
778 | if (!--space) |
779 | goto out; | |
1da177e4 | 780 | } |
1da177e4 LT |
781 | offset = 0; |
782 | } | |
1da177e4 | 783 | } |
53e7bf45 TI |
784 | out: |
785 | up_read(&card->controls_rwsem); | |
786 | if (!err && copy_to_user(_list, &list, sizeof(list))) | |
787 | err = -EFAULT; | |
788 | return err; | |
1da177e4 LT |
789 | } |
790 | ||
860c1994 TS |
791 | static bool validate_element_member_dimension(struct snd_ctl_elem_info *info) |
792 | { | |
793 | unsigned int members; | |
794 | unsigned int i; | |
795 | ||
796 | if (info->dimen.d[0] == 0) | |
797 | return true; | |
798 | ||
799 | members = 1; | |
800 | for (i = 0; i < ARRAY_SIZE(info->dimen.d); ++i) { | |
801 | if (info->dimen.d[i] == 0) | |
802 | break; | |
803 | members *= info->dimen.d[i]; | |
804 | ||
805 | /* | |
806 | * info->count should be validated in advance, to guarantee | |
807 | * calculation soundness. | |
808 | */ | |
809 | if (members > info->count) | |
810 | return false; | |
811 | } | |
812 | ||
813 | for (++i; i < ARRAY_SIZE(info->dimen.d); ++i) { | |
814 | if (info->dimen.d[i] > 0) | |
815 | return false; | |
816 | } | |
817 | ||
818 | return members == info->count; | |
819 | } | |
820 | ||
82e9bae6 TI |
821 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
822 | struct snd_ctl_elem_info *info) | |
1da177e4 | 823 | { |
82e9bae6 TI |
824 | struct snd_card *card = ctl->card; |
825 | struct snd_kcontrol *kctl; | |
826 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
827 | unsigned int index_offset; |
828 | int result; | |
829 | ||
830 | down_read(&card->controls_rwsem); | |
831 | kctl = snd_ctl_find_id(card, &info->id); | |
832 | if (kctl == NULL) { | |
833 | up_read(&card->controls_rwsem); | |
834 | return -ENOENT; | |
835 | } | |
836 | #ifdef CONFIG_SND_DEBUG | |
837 | info->access = 0; | |
838 | #endif | |
839 | result = kctl->info(kctl, info); | |
840 | if (result >= 0) { | |
7eaa943c | 841 | snd_BUG_ON(info->access); |
1da177e4 LT |
842 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
843 | vd = &kctl->vd[index_offset]; | |
844 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
845 | info->access = vd->access; | |
846 | if (vd->owner) { | |
847 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
848 | if (vd->owner == ctl) | |
849 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 850 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
851 | } else { |
852 | info->owner = -1; | |
853 | } | |
854 | } | |
855 | up_read(&card->controls_rwsem); | |
856 | return result; | |
857 | } | |
858 | ||
82e9bae6 TI |
859 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
860 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 861 | { |
82e9bae6 | 862 | struct snd_ctl_elem_info info; |
1da177e4 LT |
863 | int result; |
864 | ||
865 | if (copy_from_user(&info, _info, sizeof(info))) | |
866 | return -EFAULT; | |
64649400 | 867 | snd_power_lock(ctl->card); |
cbac4b0c | 868 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
869 | if (result >= 0) |
870 | result = snd_ctl_elem_info(ctl, &info); | |
871 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
872 | if (result >= 0) |
873 | if (copy_to_user(_info, &info, sizeof(info))) | |
874 | return -EFAULT; | |
875 | return result; | |
876 | } | |
877 | ||
d3bd67cd TI |
878 | static int snd_ctl_elem_read(struct snd_card *card, |
879 | struct snd_ctl_elem_value *control) | |
1da177e4 | 880 | { |
82e9bae6 TI |
881 | struct snd_kcontrol *kctl; |
882 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 883 | unsigned int index_offset; |
1da177e4 | 884 | |
1da177e4 | 885 | kctl = snd_ctl_find_id(card, &control->id); |
becf9e5d TS |
886 | if (kctl == NULL) |
887 | return -ENOENT; | |
888 | ||
889 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
890 | vd = &kctl->vd[index_offset]; | |
891 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get == NULL) | |
892 | return -EPERM; | |
893 | ||
894 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
895 | return kctl->get(kctl, control); | |
1da177e4 LT |
896 | } |
897 | ||
82e9bae6 TI |
898 | static int snd_ctl_elem_read_user(struct snd_card *card, |
899 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 900 | { |
82e9bae6 | 901 | struct snd_ctl_elem_value *control; |
1da177e4 | 902 | int result; |
ef44a1ec LZ |
903 | |
904 | control = memdup_user(_control, sizeof(*control)); | |
905 | if (IS_ERR(control)) | |
906 | return PTR_ERR(control); | |
907 | ||
64649400 | 908 | snd_power_lock(card); |
cbac4b0c | 909 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
becf9e5d TS |
910 | if (result >= 0) { |
911 | down_read(&card->controls_rwsem); | |
64649400 | 912 | result = snd_ctl_elem_read(card, control); |
becf9e5d TS |
913 | up_read(&card->controls_rwsem); |
914 | } | |
64649400 | 915 | snd_power_unlock(card); |
1da177e4 LT |
916 | if (result >= 0) |
917 | if (copy_to_user(_control, control, sizeof(*control))) | |
918 | result = -EFAULT; | |
919 | kfree(control); | |
920 | return result; | |
921 | } | |
922 | ||
d3bd67cd TI |
923 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
924 | struct snd_ctl_elem_value *control) | |
1da177e4 | 925 | { |
82e9bae6 TI |
926 | struct snd_kcontrol *kctl; |
927 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 928 | unsigned int index_offset; |
8ace4f3c | 929 | int result; |
1da177e4 | 930 | |
1da177e4 | 931 | kctl = snd_ctl_find_id(card, &control->id); |
becf9e5d TS |
932 | if (kctl == NULL) |
933 | return -ENOENT; | |
934 | ||
935 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
936 | vd = &kctl->vd[index_offset]; | |
937 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || kctl->put == NULL || | |
938 | (file && vd->owner && vd->owner != file)) { | |
939 | return -EPERM; | |
1da177e4 | 940 | } |
becf9e5d TS |
941 | |
942 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
943 | result = kctl->put(kctl, control); | |
944 | if (result < 0) | |
945 | return result; | |
946 | ||
947 | if (result > 0) { | |
948 | struct snd_ctl_elem_id id = control->id; | |
949 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id); | |
950 | } | |
951 | ||
952 | return 0; | |
1da177e4 LT |
953 | } |
954 | ||
82e9bae6 TI |
955 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
956 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 957 | { |
82e9bae6 | 958 | struct snd_ctl_elem_value *control; |
64649400 | 959 | struct snd_card *card; |
1da177e4 LT |
960 | int result; |
961 | ||
ef44a1ec LZ |
962 | control = memdup_user(_control, sizeof(*control)); |
963 | if (IS_ERR(control)) | |
964 | return PTR_ERR(control); | |
965 | ||
64649400 GP |
966 | card = file->card; |
967 | snd_power_lock(card); | |
cbac4b0c | 968 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
becf9e5d | 969 | if (result >= 0) { |
5bbb1ab5 | 970 | down_write(&card->controls_rwsem); |
64649400 | 971 | result = snd_ctl_elem_write(card, file, control); |
5bbb1ab5 | 972 | up_write(&card->controls_rwsem); |
becf9e5d | 973 | } |
64649400 | 974 | snd_power_unlock(card); |
1da177e4 LT |
975 | if (result >= 0) |
976 | if (copy_to_user(_control, control, sizeof(*control))) | |
977 | result = -EFAULT; | |
978 | kfree(control); | |
979 | return result; | |
980 | } | |
981 | ||
82e9bae6 TI |
982 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
983 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 984 | { |
82e9bae6 TI |
985 | struct snd_card *card = file->card; |
986 | struct snd_ctl_elem_id id; | |
987 | struct snd_kcontrol *kctl; | |
988 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
989 | int result; |
990 | ||
991 | if (copy_from_user(&id, _id, sizeof(id))) | |
992 | return -EFAULT; | |
993 | down_write(&card->controls_rwsem); | |
994 | kctl = snd_ctl_find_id(card, &id); | |
995 | if (kctl == NULL) { | |
996 | result = -ENOENT; | |
997 | } else { | |
998 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
999 | if (vd->owner != NULL) | |
1000 | result = -EBUSY; | |
1001 | else { | |
1002 | vd->owner = file; | |
1da177e4 LT |
1003 | result = 0; |
1004 | } | |
1005 | } | |
1006 | up_write(&card->controls_rwsem); | |
1007 | return result; | |
1008 | } | |
1009 | ||
82e9bae6 TI |
1010 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
1011 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1012 | { |
82e9bae6 TI |
1013 | struct snd_card *card = file->card; |
1014 | struct snd_ctl_elem_id id; | |
1015 | struct snd_kcontrol *kctl; | |
1016 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
1017 | int result; |
1018 | ||
1019 | if (copy_from_user(&id, _id, sizeof(id))) | |
1020 | return -EFAULT; | |
1021 | down_write(&card->controls_rwsem); | |
1022 | kctl = snd_ctl_find_id(card, &id); | |
1023 | if (kctl == NULL) { | |
1024 | result = -ENOENT; | |
1025 | } else { | |
1026 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
1027 | if (vd->owner == NULL) | |
1028 | result = -EINVAL; | |
1029 | else if (vd->owner != file) | |
1030 | result = -EPERM; | |
1031 | else { | |
1032 | vd->owner = NULL; | |
1da177e4 LT |
1033 | result = 0; |
1034 | } | |
1035 | } | |
1036 | up_write(&card->controls_rwsem); | |
1037 | return result; | |
1038 | } | |
1039 | ||
1040 | struct user_element { | |
82e9bae6 | 1041 | struct snd_ctl_elem_info info; |
07f4d9d7 | 1042 | struct snd_card *card; |
e1c78df1 | 1043 | char *elem_data; /* element data */ |
1da177e4 | 1044 | unsigned long elem_data_size; /* size of element data in bytes */ |
8aa9b586 JK |
1045 | void *tlv_data; /* TLV data */ |
1046 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 | 1047 | void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4 LT |
1048 | }; |
1049 | ||
82e9bae6 TI |
1050 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
1051 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
1052 | { |
1053 | struct user_element *ue = kcontrol->private_data; | |
c378c3b0 | 1054 | unsigned int offset; |
1da177e4 | 1055 | |
c378c3b0 | 1056 | offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
1da177e4 | 1057 | *uinfo = ue->info; |
c378c3b0 TS |
1058 | snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
1059 | ||
1da177e4 LT |
1060 | return 0; |
1061 | } | |
1062 | ||
8d448162 CL |
1063 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
1064 | struct snd_ctl_elem_info *uinfo) | |
1065 | { | |
1066 | struct user_element *ue = kcontrol->private_data; | |
1067 | const char *names; | |
1068 | unsigned int item; | |
c378c3b0 | 1069 | unsigned int offset; |
8d448162 CL |
1070 | |
1071 | item = uinfo->value.enumerated.item; | |
1072 | ||
c378c3b0 | 1073 | offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
8d448162 | 1074 | *uinfo = ue->info; |
c378c3b0 | 1075 | snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
8d448162 CL |
1076 | |
1077 | item = min(item, uinfo->value.enumerated.items - 1); | |
1078 | uinfo->value.enumerated.item = item; | |
1079 | ||
1080 | names = ue->priv_data; | |
1081 | for (; item > 0; --item) | |
1082 | names += strlen(names) + 1; | |
1083 | strcpy(uinfo->value.enumerated.name, names); | |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
82e9bae6 TI |
1088 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
1089 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1090 | { |
1091 | struct user_element *ue = kcontrol->private_data; | |
e1c78df1 TS |
1092 | unsigned int size = ue->elem_data_size; |
1093 | char *src = ue->elem_data + | |
1094 | snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; | |
1da177e4 | 1095 | |
e1c78df1 | 1096 | memcpy(&ucontrol->value, src, size); |
1da177e4 LT |
1097 | return 0; |
1098 | } | |
1099 | ||
82e9bae6 TI |
1100 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
1101 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1102 | { |
1103 | int change; | |
1104 | struct user_element *ue = kcontrol->private_data; | |
e1c78df1 TS |
1105 | unsigned int size = ue->elem_data_size; |
1106 | char *dst = ue->elem_data + | |
1107 | snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; | |
07f4d9d7 | 1108 | |
e1c78df1 | 1109 | change = memcmp(&ucontrol->value, dst, size) != 0; |
1da177e4 | 1110 | if (change) |
e1c78df1 | 1111 | memcpy(dst, &ucontrol->value, size); |
1da177e4 LT |
1112 | return change; |
1113 | } | |
1114 | ||
6d4d41f0 TS |
1115 | static int replace_user_tlv(struct snd_kcontrol *kctl, unsigned int __user *buf, |
1116 | unsigned int size) | |
8aa9b586 | 1117 | { |
6d4d41f0 TS |
1118 | struct user_element *ue = kctl->private_data; |
1119 | unsigned int *container; | |
da428828 TS |
1120 | struct snd_ctl_elem_id id; |
1121 | int i; | |
6d4d41f0 | 1122 | int change; |
8aa9b586 | 1123 | |
6d4d41f0 TS |
1124 | if (size > 1024 * 128) /* sane value */ |
1125 | return -EINVAL; | |
30d8340b | 1126 | |
6d4d41f0 TS |
1127 | container = memdup_user(buf, size); |
1128 | if (IS_ERR(container)) | |
1129 | return PTR_ERR(container); | |
ef44a1ec | 1130 | |
6d4d41f0 TS |
1131 | change = ue->tlv_data_size != size; |
1132 | if (!change) | |
241bc82e | 1133 | change = memcmp(ue->tlv_data, container, size) != 0; |
6d4d41f0 TS |
1134 | if (!change) { |
1135 | kfree(container); | |
1136 | return 0; | |
1137 | } | |
30d8340b | 1138 | |
6d4d41f0 TS |
1139 | kfree(ue->tlv_data); |
1140 | ue->tlv_data = container; | |
1141 | ue->tlv_data_size = size; | |
07f4d9d7 | 1142 | |
da428828 TS |
1143 | for (i = 0; i < kctl->count; ++i) { |
1144 | snd_ctl_build_ioff(&id, kctl, i); | |
1145 | snd_ctl_notify(ue->card, SNDRV_CTL_EVENT_MASK_TLV, &id); | |
1146 | } | |
fb8027eb | 1147 | |
6d4d41f0 TS |
1148 | return change; |
1149 | } | |
30d8340b | 1150 | |
6d4d41f0 TS |
1151 | static int read_user_tlv(struct snd_kcontrol *kctl, unsigned int __user *buf, |
1152 | unsigned int size) | |
1153 | { | |
1154 | struct user_element *ue = kctl->private_data; | |
1155 | ||
1156 | if (ue->tlv_data_size == 0 || ue->tlv_data == NULL) | |
1157 | return -ENXIO; | |
1158 | ||
1159 | if (size < ue->tlv_data_size) | |
1160 | return -ENOSPC; | |
1161 | ||
1162 | if (copy_to_user(buf, ue->tlv_data, ue->tlv_data_size)) | |
1163 | return -EFAULT; | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kctl, int op_flag, | |
1169 | unsigned int size, unsigned int __user *buf) | |
1170 | { | |
1171 | if (op_flag == SNDRV_CTL_TLV_OP_WRITE) | |
1172 | return replace_user_tlv(kctl, buf, size); | |
1173 | else | |
1174 | return read_user_tlv(kctl, buf, size); | |
8aa9b586 JK |
1175 | } |
1176 | ||
8d448162 CL |
1177 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
1178 | { | |
1179 | char *names, *p; | |
1180 | size_t buf_len, name_len; | |
1181 | unsigned int i; | |
447c6f93 | 1182 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162 CL |
1183 | |
1184 | if (ue->info.value.enumerated.names_length > 64 * 1024) | |
1185 | return -EINVAL; | |
1186 | ||
447c6f93 | 1187 | names = memdup_user((const void __user *)user_ptrval, |
8d448162 CL |
1188 | ue->info.value.enumerated.names_length); |
1189 | if (IS_ERR(names)) | |
1190 | return PTR_ERR(names); | |
1191 | ||
1192 | /* check that there are enough valid names */ | |
1193 | buf_len = ue->info.value.enumerated.names_length; | |
1194 | p = names; | |
1195 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { | |
1196 | name_len = strnlen(p, buf_len); | |
1197 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { | |
1198 | kfree(names); | |
1199 | return -EINVAL; | |
1200 | } | |
1201 | p += name_len + 1; | |
1202 | buf_len -= name_len + 1; | |
1203 | } | |
1204 | ||
1205 | ue->priv_data = names; | |
1206 | ue->info.value.enumerated.names_ptr = 0; | |
1207 | ||
1208 | return 0; | |
1209 | } | |
1210 | ||
82e9bae6 | 1211 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 1212 | { |
8aa9b586 | 1213 | struct user_element *ue = kcontrol->private_data; |
8d448162 CL |
1214 | |
1215 | kfree(ue->tlv_data); | |
1216 | kfree(ue->priv_data); | |
8aa9b586 | 1217 | kfree(ue); |
1da177e4 LT |
1218 | } |
1219 | ||
82e9bae6 TI |
1220 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
1221 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 1222 | { |
4ed56666 TS |
1223 | /* The capacity of struct snd_ctl_elem_value.value.*/ |
1224 | static const unsigned int value_sizes[] = { | |
1225 | [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = sizeof(long), | |
1226 | [SNDRV_CTL_ELEM_TYPE_INTEGER] = sizeof(long), | |
1227 | [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = sizeof(unsigned int), | |
1228 | [SNDRV_CTL_ELEM_TYPE_BYTES] = sizeof(unsigned char), | |
1229 | [SNDRV_CTL_ELEM_TYPE_IEC958] = sizeof(struct snd_aes_iec958), | |
1230 | [SNDRV_CTL_ELEM_TYPE_INTEGER64] = sizeof(long long), | |
1231 | }; | |
1232 | static const unsigned int max_value_counts[] = { | |
1233 | [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = 128, | |
1234 | [SNDRV_CTL_ELEM_TYPE_INTEGER] = 128, | |
1235 | [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = 128, | |
1236 | [SNDRV_CTL_ELEM_TYPE_BYTES] = 512, | |
1237 | [SNDRV_CTL_ELEM_TYPE_IEC958] = 1, | |
1238 | [SNDRV_CTL_ELEM_TYPE_INTEGER64] = 64, | |
1239 | }; | |
82e9bae6 | 1240 | struct snd_card *card = file->card; |
2225e79b TS |
1241 | struct snd_kcontrol *kctl; |
1242 | unsigned int count; | |
1da177e4 LT |
1243 | unsigned int access; |
1244 | long private_size; | |
1245 | struct user_element *ue; | |
cab2ed74 | 1246 | unsigned int offset; |
2225e79b | 1247 | int err; |
82262a46 | 1248 | |
be3bb823 TI |
1249 | if (!*info->id.name) |
1250 | return -EINVAL; | |
1251 | if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name)) | |
1252 | return -EINVAL; | |
82262a46 | 1253 | |
2225e79b | 1254 | /* Delete a control to replace them if needed. */ |
82262a46 | 1255 | if (replace) { |
2225e79b | 1256 | info->id.numid = 0; |
82262a46 LPC |
1257 | err = snd_ctl_remove_user_ctl(file, &info->id); |
1258 | if (err) | |
1259 | return err; | |
1da177e4 | 1260 | } |
82262a46 | 1261 | |
2225e79b TS |
1262 | /* |
1263 | * The number of userspace controls are counted control by control, | |
1264 | * not element by element. | |
1265 | */ | |
1266 | if (card->user_ctl_count + 1 > MAX_USER_CONTROLS) | |
82262a46 LPC |
1267 | return -ENOMEM; |
1268 | ||
2225e79b TS |
1269 | /* Check the number of elements for this userspace control. */ |
1270 | count = info->owner; | |
1271 | if (count == 0) | |
1272 | count = 1; | |
1273 | ||
1274 | /* Arrange access permissions if needed. */ | |
1275 | access = info->access; | |
1276 | if (access == 0) | |
1277 | access = SNDRV_CTL_ELEM_ACCESS_READWRITE; | |
1278 | access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | | |
1279 | SNDRV_CTL_ELEM_ACCESS_INACTIVE | | |
1280 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE); | |
1281 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) | |
8aa9b586 | 1282 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; |
2225e79b | 1283 | access |= SNDRV_CTL_ELEM_ACCESS_USER; |
4ed56666 | 1284 | |
2225e79b TS |
1285 | /* |
1286 | * Check information and calculate the size of data specific to | |
1287 | * this userspace control. | |
1288 | */ | |
4ed56666 TS |
1289 | if (info->type < SNDRV_CTL_ELEM_TYPE_BOOLEAN || |
1290 | info->type > SNDRV_CTL_ELEM_TYPE_INTEGER64) | |
1da177e4 | 1291 | return -EINVAL; |
4ed56666 TS |
1292 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED && |
1293 | info->value.enumerated.items == 0) | |
1294 | return -EINVAL; | |
1295 | if (info->count < 1 || | |
1296 | info->count > max_value_counts[info->type]) | |
1297 | return -EINVAL; | |
860c1994 TS |
1298 | if (!validate_element_member_dimension(info)) |
1299 | return -EINVAL; | |
4ed56666 | 1300 | private_size = value_sizes[info->type] * info->count; |
2225e79b TS |
1301 | |
1302 | /* | |
1303 | * Keep memory object for this userspace control. After passing this | |
1304 | * code block, the instance should be freed by snd_ctl_free_one(). | |
1305 | * | |
1306 | * Note that these elements in this control are locked. | |
1307 | */ | |
1308 | err = snd_ctl_new(&kctl, count, access, file); | |
1309 | if (err < 0) | |
1310 | return err; | |
e79d74ab | 1311 | memcpy(&kctl->id, &info->id, sizeof(kctl->id)); |
e1c78df1 | 1312 | kctl->private_data = kzalloc(sizeof(struct user_element) + private_size * count, |
2225e79b TS |
1313 | GFP_KERNEL); |
1314 | if (kctl->private_data == NULL) { | |
1315 | kfree(kctl); | |
1da177e4 | 1316 | return -ENOMEM; |
2225e79b TS |
1317 | } |
1318 | kctl->private_free = snd_ctl_elem_user_free; | |
1319 | ||
1320 | /* Set private data for this userspace control. */ | |
1321 | ue = (struct user_element *)kctl->private_data; | |
07f4d9d7 | 1322 | ue->card = card; |
1da177e4 | 1323 | ue->info = *info; |
86148e84 | 1324 | ue->info.access = 0; |
1da177e4 LT |
1325 | ue->elem_data = (char *)ue + sizeof(*ue); |
1326 | ue->elem_data_size = private_size; | |
8d448162 CL |
1327 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
1328 | err = snd_ctl_elem_init_enum_names(ue); | |
1329 | if (err < 0) { | |
2225e79b | 1330 | snd_ctl_free_one(kctl); |
8d448162 CL |
1331 | return err; |
1332 | } | |
1333 | } | |
2225e79b TS |
1334 | |
1335 | /* Set callback functions. */ | |
1336 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) | |
1337 | kctl->info = snd_ctl_elem_user_enum_info; | |
1338 | else | |
1339 | kctl->info = snd_ctl_elem_user_info; | |
1340 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
1341 | kctl->get = snd_ctl_elem_user_get; | |
1342 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
1343 | kctl->put = snd_ctl_elem_user_put; | |
1344 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) | |
1345 | kctl->tlv.c = snd_ctl_elem_user_tlv; | |
1346 | ||
1347 | /* This function manage to free the instance on failure. */ | |
1348 | err = snd_ctl_add(card, kctl); | |
2fbf182e | 1349 | if (err < 0) |
1da177e4 | 1350 | return err; |
cab2ed74 TS |
1351 | offset = snd_ctl_get_ioff(kctl, &info->id); |
1352 | snd_ctl_build_ioff(&info->id, kctl, offset); | |
1353 | /* | |
1354 | * Here we cannot fill any field for the number of elements added by | |
1355 | * this operation because there're no specific fields. The usage of | |
1356 | * 'owner' field for this purpose may cause any bugs to userspace | |
1357 | * applications because the field originally means PID of a process | |
1358 | * which locks the element. | |
1359 | */ | |
1da177e4 LT |
1360 | |
1361 | down_write(&card->controls_rwsem); | |
1362 | card->user_ctl_count++; | |
1363 | up_write(&card->controls_rwsem); | |
1364 | ||
1365 | return 0; | |
1366 | } | |
1367 | ||
82e9bae6 TI |
1368 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1369 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1370 | { |
82e9bae6 | 1371 | struct snd_ctl_elem_info info; |
cab2ed74 TS |
1372 | int err; |
1373 | ||
1da177e4 LT |
1374 | if (copy_from_user(&info, _info, sizeof(info))) |
1375 | return -EFAULT; | |
cab2ed74 TS |
1376 | err = snd_ctl_elem_add(file, &info, replace); |
1377 | if (err < 0) | |
1378 | return err; | |
1379 | if (copy_to_user(_info, &info, sizeof(info))) { | |
1380 | snd_ctl_remove_user_ctl(file, &info.id); | |
1381 | return -EFAULT; | |
1382 | } | |
1383 | ||
1384 | return 0; | |
1da177e4 LT |
1385 | } |
1386 | ||
82e9bae6 TI |
1387 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1388 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1389 | { |
82e9bae6 | 1390 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1391 | |
1392 | if (copy_from_user(&id, _id, sizeof(id))) | |
1393 | return -EFAULT; | |
f217ac59 | 1394 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1395 | } |
1396 | ||
82e9bae6 | 1397 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1398 | { |
1399 | int subscribe; | |
1400 | if (get_user(subscribe, ptr)) | |
1401 | return -EFAULT; | |
1402 | if (subscribe < 0) { | |
1403 | subscribe = file->subscribed; | |
1404 | if (put_user(subscribe, ptr)) | |
1405 | return -EFAULT; | |
1406 | return 0; | |
1407 | } | |
1408 | if (subscribe) { | |
1409 | file->subscribed = 1; | |
1410 | return 0; | |
1411 | } else if (file->subscribed) { | |
1412 | snd_ctl_empty_read_queue(file); | |
1413 | file->subscribed = 0; | |
1414 | } | |
1415 | return 0; | |
1416 | } | |
1417 | ||
450296f3 TS |
1418 | static int call_tlv_handler(struct snd_ctl_file *file, int op_flag, |
1419 | struct snd_kcontrol *kctl, | |
1420 | struct snd_ctl_elem_id *id, | |
1421 | unsigned int __user *buf, unsigned int size) | |
1422 | { | |
1423 | static const struct { | |
1424 | int op; | |
1425 | int perm; | |
1426 | } pairs[] = { | |
1427 | {SNDRV_CTL_TLV_OP_READ, SNDRV_CTL_ELEM_ACCESS_TLV_READ}, | |
1428 | {SNDRV_CTL_TLV_OP_WRITE, SNDRV_CTL_ELEM_ACCESS_TLV_WRITE}, | |
1429 | {SNDRV_CTL_TLV_OP_CMD, SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND}, | |
1430 | }; | |
1431 | struct snd_kcontrol_volatile *vd = &kctl->vd[snd_ctl_get_ioff(kctl, id)]; | |
1432 | int i; | |
450296f3 TS |
1433 | |
1434 | /* Check support of the request for this element. */ | |
1435 | for (i = 0; i < ARRAY_SIZE(pairs); ++i) { | |
1436 | if (op_flag == pairs[i].op && (vd->access & pairs[i].perm)) | |
1437 | break; | |
1438 | } | |
1439 | if (i == ARRAY_SIZE(pairs)) | |
1440 | return -ENXIO; | |
1441 | ||
1442 | if (kctl->tlv.c == NULL) | |
1443 | return -ENXIO; | |
1444 | ||
1445 | /* When locked, this is unavailable. */ | |
1446 | if (vd->owner != NULL && vd->owner != file) | |
1447 | return -EPERM; | |
1448 | ||
fb8027eb | 1449 | return kctl->tlv.c(kctl, op_flag, size, buf); |
450296f3 TS |
1450 | } |
1451 | ||
1452 | static int read_tlv_buf(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id, | |
1453 | unsigned int __user *buf, unsigned int size) | |
1454 | { | |
1455 | struct snd_kcontrol_volatile *vd = &kctl->vd[snd_ctl_get_ioff(kctl, id)]; | |
1456 | unsigned int len; | |
1457 | ||
1458 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ)) | |
1459 | return -ENXIO; | |
1460 | ||
1461 | if (kctl->tlv.p == NULL) | |
1462 | return -ENXIO; | |
1463 | ||
1464 | len = sizeof(unsigned int) * 2 + kctl->tlv.p[1]; | |
1465 | if (size < len) | |
1466 | return -ENOMEM; | |
1467 | ||
1468 | if (copy_to_user(buf, kctl->tlv.p, len)) | |
1469 | return -EFAULT; | |
1470 | ||
1471 | return 0; | |
1472 | } | |
1473 | ||
8aa9b586 | 1474 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
450296f3 | 1475 | struct snd_ctl_tlv __user *buf, |
8aa9b586 | 1476 | int op_flag) |
42750b04 | 1477 | { |
450296f3 TS |
1478 | struct snd_ctl_tlv header; |
1479 | unsigned int *container; | |
1480 | unsigned int container_size; | |
42750b04 | 1481 | struct snd_kcontrol *kctl; |
450296f3 | 1482 | struct snd_ctl_elem_id id; |
8aa9b586 | 1483 | struct snd_kcontrol_volatile *vd; |
42750b04 | 1484 | |
450296f3 | 1485 | if (copy_from_user(&header, buf, sizeof(header))) |
42750b04 | 1486 | return -EFAULT; |
450296f3 TS |
1487 | |
1488 | /* In design of control core, numerical ID starts at 1. */ | |
1489 | if (header.numid == 0) | |
8aa9b586 | 1490 | return -EINVAL; |
450296f3 TS |
1491 | |
1492 | /* At least, container should include type and length fields. */ | |
1493 | if (header.length < sizeof(unsigned int) * 2) | |
c0bcdbdf | 1494 | return -EINVAL; |
450296f3 TS |
1495 | container_size = header.length; |
1496 | container = buf->tlv; | |
4c8099e9 | 1497 | |
450296f3 | 1498 | kctl = snd_ctl_find_numid(file->card, header.numid); |
4c8099e9 TS |
1499 | if (kctl == NULL) |
1500 | return -ENOENT; | |
1501 | ||
450296f3 TS |
1502 | /* Calculate index of the element in this set. */ |
1503 | id = kctl->id; | |
1504 | snd_ctl_build_ioff(&id, kctl, header.numid - id.numid); | |
1505 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
4c8099e9 | 1506 | |
8aa9b586 | 1507 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { |
450296f3 TS |
1508 | return call_tlv_handler(file, op_flag, kctl, &id, container, |
1509 | container_size); | |
8aa9b586 | 1510 | } else { |
450296f3 TS |
1511 | if (op_flag == SNDRV_CTL_TLV_OP_READ) { |
1512 | return read_tlv_buf(kctl, &id, container, | |
1513 | container_size); | |
1514 | } | |
8aa9b586 | 1515 | } |
4c8099e9 | 1516 | |
450296f3 TS |
1517 | /* Not supported. */ |
1518 | return -ENXIO; | |
42750b04 JK |
1519 | } |
1520 | ||
1da177e4 LT |
1521 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1522 | { | |
82e9bae6 TI |
1523 | struct snd_ctl_file *ctl; |
1524 | struct snd_card *card; | |
82e9bae6 | 1525 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1526 | void __user *argp = (void __user *)arg; |
1527 | int __user *ip = argp; | |
1528 | int err; | |
1529 | ||
1530 | ctl = file->private_data; | |
1531 | card = ctl->card; | |
7eaa943c TI |
1532 | if (snd_BUG_ON(!card)) |
1533 | return -ENXIO; | |
1da177e4 LT |
1534 | switch (cmd) { |
1535 | case SNDRV_CTL_IOCTL_PVERSION: | |
1536 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1537 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1538 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1539 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1540 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1541 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1542 | return snd_ctl_elem_info_user(ctl, argp); | |
1543 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1544 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1545 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1546 | return snd_ctl_elem_write_user(ctl, argp); | |
1547 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1548 | return snd_ctl_elem_lock(ctl, argp); | |
1549 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1550 | return snd_ctl_elem_unlock(ctl, argp); | |
1551 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1552 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1553 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1554 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1555 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1556 | return snd_ctl_elem_remove(ctl, argp); | |
1557 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1558 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 | 1559 | case SNDRV_CTL_IOCTL_TLV_READ: |
4c8099e9 TS |
1560 | down_read(&ctl->card->controls_rwsem); |
1561 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ); | |
1562 | up_read(&ctl->card->controls_rwsem); | |
1563 | return err; | |
8aa9b586 | 1564 | case SNDRV_CTL_IOCTL_TLV_WRITE: |
4c8099e9 TS |
1565 | down_write(&ctl->card->controls_rwsem); |
1566 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE); | |
1567 | up_write(&ctl->card->controls_rwsem); | |
1568 | return err; | |
8aa9b586 | 1569 | case SNDRV_CTL_IOCTL_TLV_COMMAND: |
4c8099e9 TS |
1570 | down_write(&ctl->card->controls_rwsem); |
1571 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD); | |
1572 | up_write(&ctl->card->controls_rwsem); | |
1573 | return err; | |
1da177e4 | 1574 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1575 | return -ENOPROTOOPT; |
1da177e4 LT |
1576 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1577 | #ifdef CONFIG_PM | |
1578 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1579 | #else | |
1580 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1581 | #endif | |
1582 | } | |
1583 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1584 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1585 | err = p->fioctl(card, ctl, cmd, arg); |
1586 | if (err != -ENOIOCTLCMD) { | |
1587 | up_read(&snd_ioctl_rwsem); | |
1588 | return err; | |
1589 | } | |
1590 | } | |
1591 | up_read(&snd_ioctl_rwsem); | |
bb009457 | 1592 | dev_dbg(card->dev, "unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1593 | return -ENOTTY; |
1594 | } | |
1595 | ||
82e9bae6 TI |
1596 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1597 | size_t count, loff_t * offset) | |
1da177e4 | 1598 | { |
82e9bae6 | 1599 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1600 | int err = 0; |
1601 | ssize_t result = 0; | |
1602 | ||
1603 | ctl = file->private_data; | |
7eaa943c TI |
1604 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1605 | return -ENXIO; | |
1da177e4 LT |
1606 | if (!ctl->subscribed) |
1607 | return -EBADFD; | |
82e9bae6 | 1608 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1609 | return -EINVAL; |
1610 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1611 | while (count >= sizeof(struct snd_ctl_event)) { |
1612 | struct snd_ctl_event ev; | |
1613 | struct snd_kctl_event *kev; | |
1da177e4 | 1614 | while (list_empty(&ctl->events)) { |
ac6424b9 | 1615 | wait_queue_entry_t wait; |
1da177e4 LT |
1616 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
1617 | err = -EAGAIN; | |
1618 | goto __end_lock; | |
1619 | } | |
1620 | init_waitqueue_entry(&wait, current); | |
1621 | add_wait_queue(&ctl->change_sleep, &wait); | |
1622 | set_current_state(TASK_INTERRUPTIBLE); | |
1623 | spin_unlock_irq(&ctl->read_lock); | |
1624 | schedule(); | |
1625 | remove_wait_queue(&ctl->change_sleep, &wait); | |
0914f796 TI |
1626 | if (ctl->card->shutdown) |
1627 | return -ENODEV; | |
1da177e4 | 1628 | if (signal_pending(current)) |
0e5d720c | 1629 | return -ERESTARTSYS; |
1da177e4 LT |
1630 | spin_lock_irq(&ctl->read_lock); |
1631 | } | |
1632 | kev = snd_kctl_event(ctl->events.next); | |
1633 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1634 | ev.data.elem.mask = kev->mask; | |
1635 | ev.data.elem.id = kev->id; | |
1636 | list_del(&kev->list); | |
1637 | spin_unlock_irq(&ctl->read_lock); | |
1638 | kfree(kev); | |
82e9bae6 | 1639 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1640 | err = -EFAULT; |
1641 | goto __end; | |
1642 | } | |
1643 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1644 | buffer += sizeof(struct snd_ctl_event); |
1645 | count -= sizeof(struct snd_ctl_event); | |
1646 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1647 | } |
1648 | __end_lock: | |
1649 | spin_unlock_irq(&ctl->read_lock); | |
1650 | __end: | |
1651 | return result > 0 ? result : err; | |
1652 | } | |
1653 | ||
1654 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1655 | { | |
1656 | unsigned int mask; | |
82e9bae6 | 1657 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1658 | |
1659 | ctl = file->private_data; | |
1660 | if (!ctl->subscribed) | |
1661 | return 0; | |
1662 | poll_wait(file, &ctl->change_sleep, wait); | |
1663 | ||
1664 | mask = 0; | |
1665 | if (!list_empty(&ctl->events)) | |
1666 | mask |= POLLIN | POLLRDNORM; | |
1667 | ||
1668 | return mask; | |
1669 | } | |
1670 | ||
1671 | /* | |
1672 | * register the device-specific control-ioctls. | |
1673 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1674 | */ | |
1675 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1676 | { | |
82e9bae6 | 1677 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1678 | |
82e9bae6 | 1679 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1680 | if (pn == NULL) |
1681 | return -ENOMEM; | |
1682 | pn->fioctl = fcn; | |
1683 | down_write(&snd_ioctl_rwsem); | |
1684 | list_add_tail(&pn->list, lists); | |
1685 | up_write(&snd_ioctl_rwsem); | |
1686 | return 0; | |
1687 | } | |
1688 | ||
12cddbd8 TI |
1689 | /** |
1690 | * snd_ctl_register_ioctl - register the device-specific control-ioctls | |
1691 | * @fcn: ioctl callback function | |
1692 | * | |
1693 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1694 | */ | |
1da177e4 LT |
1695 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) |
1696 | { | |
1697 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1698 | } | |
c0d3fb39 TI |
1699 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1700 | ||
1da177e4 | 1701 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1702 | /** |
1703 | * snd_ctl_register_ioctl_compat - register the device-specific 32bit compat | |
1704 | * control-ioctls | |
1705 | * @fcn: ioctl callback function | |
1706 | */ | |
1da177e4 LT |
1707 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1708 | { | |
1709 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1710 | } | |
c0d3fb39 | 1711 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); |
1da177e4 LT |
1712 | #endif |
1713 | ||
1714 | /* | |
1715 | * de-register the device-specific control-ioctls. | |
1716 | */ | |
82e9bae6 TI |
1717 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1718 | struct list_head *lists) | |
1da177e4 | 1719 | { |
82e9bae6 | 1720 | struct snd_kctl_ioctl *p; |
1da177e4 | 1721 | |
7eaa943c TI |
1722 | if (snd_BUG_ON(!fcn)) |
1723 | return -EINVAL; | |
1da177e4 | 1724 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1725 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1726 | if (p->fioctl == fcn) { |
1727 | list_del(&p->list); | |
1728 | up_write(&snd_ioctl_rwsem); | |
1729 | kfree(p); | |
1730 | return 0; | |
1731 | } | |
1732 | } | |
1733 | up_write(&snd_ioctl_rwsem); | |
1734 | snd_BUG(); | |
1735 | return -EINVAL; | |
1736 | } | |
1737 | ||
12cddbd8 TI |
1738 | /** |
1739 | * snd_ctl_unregister_ioctl - de-register the device-specific control-ioctls | |
1740 | * @fcn: ioctl callback function to unregister | |
1741 | */ | |
1da177e4 LT |
1742 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) |
1743 | { | |
1744 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1745 | } | |
c0d3fb39 TI |
1746 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1747 | ||
1da177e4 | 1748 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1749 | /** |
1750 | * snd_ctl_unregister_ioctl - de-register the device-specific compat 32bit | |
1751 | * control-ioctls | |
1752 | * @fcn: ioctl callback function to unregister | |
1753 | */ | |
1da177e4 LT |
1754 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1755 | { | |
1756 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1757 | } | |
c0d3fb39 | 1758 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1759 | #endif |
1760 | ||
1761 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1762 | { | |
82e9bae6 | 1763 | struct snd_ctl_file *ctl; |
60aa4924 | 1764 | |
1da177e4 | 1765 | ctl = file->private_data; |
60aa4924 | 1766 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1767 | } |
1768 | ||
23c18d4b TI |
1769 | /* return the preferred subdevice number if already assigned; |
1770 | * otherwise return -1 | |
1771 | */ | |
1772 | int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type) | |
1773 | { | |
1774 | struct snd_ctl_file *kctl; | |
1775 | int subdevice = -1; | |
1776 | ||
1777 | read_lock(&card->ctl_files_rwlock); | |
1778 | list_for_each_entry(kctl, &card->ctl_files, list) { | |
1779 | if (kctl->pid == task_pid(current)) { | |
1780 | subdevice = kctl->preferred_subdevice[type]; | |
1781 | if (subdevice != -1) | |
1782 | break; | |
1783 | } | |
1784 | } | |
1785 | read_unlock(&card->ctl_files_rwlock); | |
1786 | return subdevice; | |
1787 | } | |
1788 | EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice); | |
1789 | ||
1da177e4 LT |
1790 | /* |
1791 | * ioctl32 compat | |
1792 | */ | |
1793 | #ifdef CONFIG_COMPAT | |
1794 | #include "control_compat.c" | |
1795 | #else | |
1796 | #define snd_ctl_ioctl_compat NULL | |
1797 | #endif | |
1798 | ||
1799 | /* | |
1800 | * INIT PART | |
1801 | */ | |
1802 | ||
9c2e08c5 | 1803 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1804 | { |
1805 | .owner = THIS_MODULE, | |
1806 | .read = snd_ctl_read, | |
1807 | .open = snd_ctl_open, | |
1808 | .release = snd_ctl_release, | |
02f4865f | 1809 | .llseek = no_llseek, |
1da177e4 LT |
1810 | .poll = snd_ctl_poll, |
1811 | .unlocked_ioctl = snd_ctl_ioctl, | |
1812 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1813 | .fasync = snd_ctl_fasync, | |
1814 | }; | |
1815 | ||
1da177e4 LT |
1816 | /* |
1817 | * registration of the control device | |
1818 | */ | |
82e9bae6 | 1819 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1820 | { |
82e9bae6 | 1821 | struct snd_card *card = device->device_data; |
1da177e4 | 1822 | |
40a4b263 TI |
1823 | return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1824 | &snd_ctl_f_ops, card, &card->ctl_dev); | |
1da177e4 LT |
1825 | } |
1826 | ||
1827 | /* | |
1828 | * disconnection of the control device | |
1829 | */ | |
82e9bae6 | 1830 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1831 | { |
82e9bae6 | 1832 | struct snd_card *card = device->device_data; |
82e9bae6 | 1833 | struct snd_ctl_file *ctl; |
1da177e4 | 1834 | |
d8009882 | 1835 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1836 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1837 | wake_up(&ctl->change_sleep); |
1838 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1839 | } | |
d8009882 | 1840 | read_unlock(&card->ctl_files_rwlock); |
c461482c | 1841 | |
40a4b263 | 1842 | return snd_unregister_device(&card->ctl_dev); |
1da177e4 LT |
1843 | } |
1844 | ||
1845 | /* | |
1846 | * free all controls | |
1847 | */ | |
82e9bae6 | 1848 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1849 | { |
82e9bae6 TI |
1850 | struct snd_card *card = device->device_data; |
1851 | struct snd_kcontrol *control; | |
1da177e4 LT |
1852 | |
1853 | down_write(&card->controls_rwsem); | |
1854 | while (!list_empty(&card->controls)) { | |
1855 | control = snd_kcontrol(card->controls.next); | |
1856 | snd_ctl_remove(card, control); | |
1857 | } | |
1858 | up_write(&card->controls_rwsem); | |
0fcd9f4b | 1859 | put_device(&card->ctl_dev); |
1da177e4 LT |
1860 | return 0; |
1861 | } | |
1862 | ||
1da177e4 LT |
1863 | /* |
1864 | * create control core: | |
1865 | * called from init.c | |
1866 | */ | |
82e9bae6 | 1867 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1868 | { |
82e9bae6 | 1869 | static struct snd_device_ops ops = { |
1da177e4 LT |
1870 | .dev_free = snd_ctl_dev_free, |
1871 | .dev_register = snd_ctl_dev_register, | |
1872 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 | 1873 | }; |
0fcd9f4b | 1874 | int err; |
1da177e4 | 1875 | |
7eaa943c TI |
1876 | if (snd_BUG_ON(!card)) |
1877 | return -ENXIO; | |
0fcd9f4b TI |
1878 | if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS)) |
1879 | return -ENXIO; | |
1880 | ||
1881 | snd_device_initialize(&card->ctl_dev, card); | |
1882 | dev_set_name(&card->ctl_dev, "controlC%d", card->number); | |
1883 | ||
1884 | err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1885 | if (err < 0) | |
1886 | put_device(&card->ctl_dev); | |
1887 | return err; | |
1da177e4 | 1888 | } |
b9ed4f2b TI |
1889 | |
1890 | /* | |
9600732b | 1891 | * Frequently used control callbacks/helpers |
b9ed4f2b | 1892 | */ |
12cddbd8 TI |
1893 | |
1894 | /** | |
1895 | * snd_ctl_boolean_mono_info - Helper function for a standard boolean info | |
1896 | * callback with a mono channel | |
1897 | * @kcontrol: the kcontrol instance | |
1898 | * @uinfo: info to store | |
1899 | * | |
1900 | * This is a function that can be used as info callback for a standard | |
1901 | * boolean control with a single mono channel. | |
1902 | */ | |
b9ed4f2b TI |
1903 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, |
1904 | struct snd_ctl_elem_info *uinfo) | |
1905 | { | |
1906 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1907 | uinfo->count = 1; | |
1908 | uinfo->value.integer.min = 0; | |
1909 | uinfo->value.integer.max = 1; | |
1910 | return 0; | |
1911 | } | |
b9ed4f2b TI |
1912 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); |
1913 | ||
12cddbd8 TI |
1914 | /** |
1915 | * snd_ctl_boolean_stereo_info - Helper function for a standard boolean info | |
1916 | * callback with stereo two channels | |
1917 | * @kcontrol: the kcontrol instance | |
1918 | * @uinfo: info to store | |
1919 | * | |
1920 | * This is a function that can be used as info callback for a standard | |
1921 | * boolean control with stereo two channels. | |
1922 | */ | |
b9ed4f2b TI |
1923 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, |
1924 | struct snd_ctl_elem_info *uinfo) | |
1925 | { | |
1926 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1927 | uinfo->count = 2; | |
1928 | uinfo->value.integer.min = 0; | |
1929 | uinfo->value.integer.max = 1; | |
1930 | return 0; | |
1931 | } | |
b9ed4f2b | 1932 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |
9600732b CL |
1933 | |
1934 | /** | |
1935 | * snd_ctl_enum_info - fills the info structure for an enumerated control | |
1936 | * @info: the structure to be filled | |
1937 | * @channels: the number of the control's channels; often one | |
1938 | * @items: the number of control values; also the size of @names | |
1939 | * @names: an array containing the names of all control values | |
1940 | * | |
1941 | * Sets all required fields in @info to their appropriate values. | |
1942 | * If the control's accessibility is not the default (readable and writable), | |
1943 | * the caller has to fill @info->access. | |
eb7c06e8 YB |
1944 | * |
1945 | * Return: Zero. | |
9600732b CL |
1946 | */ |
1947 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, | |
1948 | unsigned int items, const char *const names[]) | |
1949 | { | |
1950 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; | |
1951 | info->count = channels; | |
1952 | info->value.enumerated.items = items; | |
a7e6fb99 TI |
1953 | if (!items) |
1954 | return 0; | |
9600732b CL |
1955 | if (info->value.enumerated.item >= items) |
1956 | info->value.enumerated.item = items - 1; | |
df803e13 TI |
1957 | WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name), |
1958 | "ALSA: too long item name '%s'\n", | |
1959 | names[info->value.enumerated.item]); | |
9600732b CL |
1960 | strlcpy(info->value.enumerated.name, |
1961 | names[info->value.enumerated.item], | |
1962 | sizeof(info->value.enumerated.name)); | |
1963 | return 0; | |
1964 | } | |
1965 | EXPORT_SYMBOL(snd_ctl_enum_info); |