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> | |
88a89037 | 28 | #include <linux/mm.h> |
174cd4b1 | 29 | #include <linux/sched/signal.h> |
1da177e4 LT |
30 | #include <sound/core.h> |
31 | #include <sound/minors.h> | |
32 | #include <sound/info.h> | |
33 | #include <sound/control.h> | |
34 | ||
35 | /* max number of user-defined controls */ | |
36 | #define MAX_USER_CONTROLS 32 | |
5591bf07 | 37 | #define MAX_CONTROL_COUNT 1028 |
1da177e4 | 38 | |
82e9bae6 | 39 | struct snd_kctl_ioctl { |
1da177e4 LT |
40 | struct list_head list; /* list of all ioctls */ |
41 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 42 | }; |
1da177e4 LT |
43 | |
44 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
45 | static LIST_HEAD(snd_control_ioctls); | |
46 | #ifdef CONFIG_COMPAT | |
47 | static LIST_HEAD(snd_control_compat_ioctls); | |
48 | #endif | |
49 | ||
50 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
51 | { | |
1da177e4 | 52 | unsigned long flags; |
82e9bae6 TI |
53 | struct snd_card *card; |
54 | struct snd_ctl_file *ctl; | |
23c18d4b | 55 | int i, err; |
1da177e4 | 56 | |
02f4865f TI |
57 | err = nonseekable_open(inode, file); |
58 | if (err < 0) | |
59 | return err; | |
60 | ||
f87135f5 | 61 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
62 | if (!card) { |
63 | err = -ENODEV; | |
64 | goto __error1; | |
65 | } | |
66 | err = snd_card_file_add(card, file); | |
67 | if (err < 0) { | |
68 | err = -ENODEV; | |
69 | goto __error1; | |
70 | } | |
71 | if (!try_module_get(card->module)) { | |
72 | err = -EFAULT; | |
73 | goto __error2; | |
74 | } | |
ca2c0966 | 75 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
76 | if (ctl == NULL) { |
77 | err = -ENOMEM; | |
78 | goto __error; | |
79 | } | |
80 | INIT_LIST_HEAD(&ctl->events); | |
81 | init_waitqueue_head(&ctl->change_sleep); | |
82 | spin_lock_init(&ctl->read_lock); | |
83 | ctl->card = card; | |
23c18d4b TI |
84 | for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++) |
85 | ctl->preferred_subdevice[i] = -1; | |
25d27ede | 86 | ctl->pid = get_pid(task_pid(current)); |
1da177e4 LT |
87 | file->private_data = ctl; |
88 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
89 | list_add_tail(&ctl->list, &card->ctl_files); | |
90 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
a0830dbd | 91 | snd_card_unref(card); |
1da177e4 LT |
92 | return 0; |
93 | ||
94 | __error: | |
95 | module_put(card->module); | |
96 | __error2: | |
97 | snd_card_file_remove(card, file); | |
98 | __error1: | |
a0830dbd TI |
99 | if (card) |
100 | snd_card_unref(card); | |
1da177e4 LT |
101 | return err; |
102 | } | |
103 | ||
82e9bae6 | 104 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 105 | { |
7507e8da | 106 | unsigned long flags; |
82e9bae6 | 107 | struct snd_kctl_event *cread; |
1da177e4 | 108 | |
7507e8da | 109 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
110 | while (!list_empty(&ctl->events)) { |
111 | cread = snd_kctl_event(ctl->events.next); | |
112 | list_del(&cread->list); | |
113 | kfree(cread); | |
114 | } | |
7507e8da | 115 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
116 | } |
117 | ||
118 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
119 | { | |
120 | unsigned long flags; | |
82e9bae6 TI |
121 | struct snd_card *card; |
122 | struct snd_ctl_file *ctl; | |
123 | struct snd_kcontrol *control; | |
1da177e4 LT |
124 | unsigned int idx; |
125 | ||
126 | ctl = file->private_data; | |
1da177e4 LT |
127 | file->private_data = NULL; |
128 | card = ctl->card; | |
129 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
130 | list_del(&ctl->list); | |
131 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
132 | down_write(&card->controls_rwsem); | |
9244b2c3 | 133 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
134 | for (idx = 0; idx < control->count; idx++) |
135 | if (control->vd[idx].owner == ctl) | |
136 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
137 | up_write(&card->controls_rwsem); |
138 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 139 | put_pid(ctl->pid); |
1da177e4 LT |
140 | kfree(ctl); |
141 | module_put(card->module); | |
142 | snd_card_file_remove(card, file); | |
143 | return 0; | |
144 | } | |
145 | ||
12cddbd8 TI |
146 | /** |
147 | * snd_ctl_notify - Send notification to user-space for a control change | |
148 | * @card: the card to send notification | |
149 | * @mask: the event mask, SNDRV_CTL_EVENT_* | |
150 | * @id: the ctl element id to send notification | |
151 | * | |
152 | * This function adds an event record with the given id and mask, appends | |
153 | * to the list and wakes up the user-space for notification. This can be | |
154 | * called in the atomic context. | |
155 | */ | |
82e9bae6 TI |
156 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
157 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
158 | { |
159 | unsigned long flags; | |
82e9bae6 TI |
160 | struct snd_ctl_file *ctl; |
161 | struct snd_kctl_event *ev; | |
1da177e4 | 162 | |
7eaa943c TI |
163 | if (snd_BUG_ON(!card || !id)) |
164 | return; | |
f388cdcd TI |
165 | if (card->shutdown) |
166 | return; | |
1da177e4 | 167 | read_lock(&card->ctl_files_rwlock); |
8eeaa2f9 | 168 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
169 | card->mixer_oss_change_count++; |
170 | #endif | |
9244b2c3 | 171 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
172 | if (!ctl->subscribed) |
173 | continue; | |
174 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 175 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
176 | if (ev->id.numid == id->numid) { |
177 | ev->mask |= mask; | |
178 | goto _found; | |
179 | } | |
180 | } | |
ca2c0966 | 181 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
182 | if (ev) { |
183 | ev->id = *id; | |
184 | ev->mask = mask; | |
185 | list_add_tail(&ev->list, &ctl->events); | |
186 | } else { | |
bb009457 | 187 | dev_err(card->dev, "No memory available to allocate event\n"); |
1da177e4 LT |
188 | } |
189 | _found: | |
190 | wake_up(&ctl->change_sleep); | |
191 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
192 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
193 | } | |
194 | read_unlock(&card->ctl_files_rwlock); | |
195 | } | |
c0d3fb39 TI |
196 | EXPORT_SYMBOL(snd_ctl_notify); |
197 | ||
1da177e4 | 198 | /** |
2225e79b TS |
199 | * snd_ctl_new - create a new control instance with some elements |
200 | * @kctl: the pointer to store new control instance | |
201 | * @count: the number of elements in this control | |
202 | * @access: the default access flags for elements in this control | |
203 | * @file: given when locking these elements | |
1da177e4 | 204 | * |
2225e79b TS |
205 | * Allocates a memory object for a new control instance. The instance has |
206 | * elements as many as the given number (@count). Each element has given | |
207 | * access permissions (@access). Each element is locked when @file is given. | |
1da177e4 | 208 | * |
2225e79b | 209 | * Return: 0 on success, error code on failure |
1da177e4 | 210 | */ |
2225e79b TS |
211 | static int snd_ctl_new(struct snd_kcontrol **kctl, unsigned int count, |
212 | unsigned int access, struct snd_ctl_file *file) | |
1da177e4 | 213 | { |
2225e79b | 214 | unsigned int size; |
1da177e4 LT |
215 | unsigned int idx; |
216 | ||
2225e79b TS |
217 | if (count == 0 || count > MAX_CONTROL_COUNT) |
218 | return -EINVAL; | |
5591bf07 | 219 | |
2225e79b TS |
220 | size = sizeof(struct snd_kcontrol); |
221 | size += sizeof(struct snd_kcontrol_volatile) * count; | |
5591bf07 | 222 | |
2225e79b | 223 | *kctl = kzalloc(size, GFP_KERNEL); |
ec0e9937 | 224 | if (!*kctl) |
2225e79b | 225 | return -ENOMEM; |
2225e79b TS |
226 | |
227 | for (idx = 0; idx < count; idx++) { | |
228 | (*kctl)->vd[idx].access = access; | |
229 | (*kctl)->vd[idx].owner = file; | |
230 | } | |
231 | (*kctl)->count = count; | |
232 | ||
233 | return 0; | |
1da177e4 LT |
234 | } |
235 | ||
236 | /** | |
237 | * snd_ctl_new1 - create a control instance from the template | |
238 | * @ncontrol: the initialization record | |
239 | * @private_data: the private data to set | |
240 | * | |
82e9bae6 | 241 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
242 | * template. When the access field of ncontrol is 0, it's assumed as |
243 | * READWRITE access. When the count field is 0, it's assumes as one. | |
244 | * | |
eb7c06e8 | 245 | * Return: The pointer of the newly generated instance, or %NULL on failure. |
1da177e4 | 246 | */ |
82e9bae6 TI |
247 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
248 | void *private_data) | |
1da177e4 | 249 | { |
2225e79b TS |
250 | struct snd_kcontrol *kctl; |
251 | unsigned int count; | |
1da177e4 | 252 | unsigned int access; |
2225e79b | 253 | int err; |
1da177e4 | 254 | |
7eaa943c TI |
255 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
256 | return NULL; | |
2225e79b TS |
257 | |
258 | count = ncontrol->count; | |
259 | if (count == 0) | |
260 | count = 1; | |
261 | ||
262 | access = ncontrol->access; | |
263 | if (access == 0) | |
264 | access = SNDRV_CTL_ELEM_ACCESS_READWRITE; | |
265 | access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | | |
266 | SNDRV_CTL_ELEM_ACCESS_VOLATILE | | |
267 | SNDRV_CTL_ELEM_ACCESS_INACTIVE | | |
268 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE | | |
269 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND | | |
270 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK); | |
271 | ||
272 | err = snd_ctl_new(&kctl, count, access, NULL); | |
273 | if (err < 0) | |
274 | return NULL; | |
275 | ||
276 | /* The 'numid' member is decided when calling snd_ctl_add(). */ | |
277 | kctl->id.iface = ncontrol->iface; | |
278 | kctl->id.device = ncontrol->device; | |
279 | kctl->id.subdevice = ncontrol->subdevice; | |
366840d7 | 280 | if (ncontrol->name) { |
2225e79b TS |
281 | strlcpy(kctl->id.name, ncontrol->name, sizeof(kctl->id.name)); |
282 | if (strcmp(ncontrol->name, kctl->id.name) != 0) | |
bb009457 | 283 | pr_warn("ALSA: Control name '%s' truncated to '%s'\n", |
2225e79b | 284 | ncontrol->name, kctl->id.name); |
366840d7 | 285 | } |
2225e79b TS |
286 | kctl->id.index = ncontrol->index; |
287 | ||
288 | kctl->info = ncontrol->info; | |
289 | kctl->get = ncontrol->get; | |
290 | kctl->put = ncontrol->put; | |
291 | kctl->tlv.p = ncontrol->tlv.p; | |
292 | ||
293 | kctl->private_value = ncontrol->private_value; | |
294 | kctl->private_data = private_data; | |
295 | ||
296 | return kctl; | |
1da177e4 | 297 | } |
c0d3fb39 TI |
298 | EXPORT_SYMBOL(snd_ctl_new1); |
299 | ||
1da177e4 LT |
300 | /** |
301 | * snd_ctl_free_one - release the control instance | |
302 | * @kcontrol: the control instance | |
303 | * | |
304 | * Releases the control instance created via snd_ctl_new() | |
305 | * or snd_ctl_new1(). | |
306 | * Don't call this after the control was added to the card. | |
307 | */ | |
82e9bae6 | 308 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
309 | { |
310 | if (kcontrol) { | |
311 | if (kcontrol->private_free) | |
312 | kcontrol->private_free(kcontrol); | |
313 | kfree(kcontrol); | |
314 | } | |
315 | } | |
c0d3fb39 TI |
316 | EXPORT_SYMBOL(snd_ctl_free_one); |
317 | ||
0e82e5fa CL |
318 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
319 | unsigned int count) | |
1da177e4 | 320 | { |
82e9bae6 | 321 | struct snd_kcontrol *kctl; |
1da177e4 | 322 | |
ac902c11 LPC |
323 | /* Make sure that the ids assigned to the control do not wrap around */ |
324 | if (card->last_numid >= UINT_MAX - count) | |
325 | card->last_numid = 0; | |
326 | ||
9244b2c3 | 327 | list_for_each_entry(kctl, &card->controls, list) { |
7c733587 | 328 | if (kctl->id.numid < card->last_numid + 1 + count && |
0e82e5fa CL |
329 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
330 | card->last_numid = kctl->id.numid + kctl->count - 1; | |
331 | return true; | |
332 | } | |
1da177e4 | 333 | } |
0e82e5fa | 334 | return false; |
1da177e4 LT |
335 | } |
336 | ||
82e9bae6 | 337 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 | 338 | { |
0e82e5fa | 339 | unsigned int iter = 100000; |
1da177e4 | 340 | |
0e82e5fa | 341 | while (snd_ctl_remove_numid_conflict(card, count)) { |
1da177e4 LT |
342 | if (--iter == 0) { |
343 | /* this situation is very unlikely */ | |
bb009457 | 344 | dev_err(card->dev, "unable to allocate new control numid\n"); |
1da177e4 LT |
345 | return -ENOMEM; |
346 | } | |
1da177e4 LT |
347 | } |
348 | return 0; | |
349 | } | |
350 | ||
351 | /** | |
352 | * snd_ctl_add - add the control instance to the card | |
353 | * @card: the card instance | |
354 | * @kcontrol: the control instance to add | |
355 | * | |
356 | * Adds the control instance created via snd_ctl_new() or | |
357 | * snd_ctl_new1() to the given card. Assigns also an unique | |
358 | * numid used for fast search. | |
359 | * | |
1da177e4 | 360 | * It frees automatically the control which cannot be added. |
eb7c06e8 YB |
361 | * |
362 | * Return: Zero if successful, or a negative error code on failure. | |
363 | * | |
1da177e4 | 364 | */ |
82e9bae6 | 365 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 366 | { |
82e9bae6 | 367 | struct snd_ctl_elem_id id; |
1da177e4 | 368 | unsigned int idx; |
fd9f26e4 | 369 | unsigned int count; |
c6077b30 | 370 | int err = -EINVAL; |
1da177e4 | 371 | |
73e77ba0 | 372 | if (! kcontrol) |
c6077b30 | 373 | return err; |
7eaa943c TI |
374 | if (snd_BUG_ON(!card || !kcontrol->info)) |
375 | goto error; | |
1da177e4 | 376 | id = kcontrol->id; |
883a1d49 LPC |
377 | if (id.index > UINT_MAX - kcontrol->count) |
378 | goto error; | |
379 | ||
1da177e4 LT |
380 | down_write(&card->controls_rwsem); |
381 | if (snd_ctl_find_id(card, &id)) { | |
382 | up_write(&card->controls_rwsem); | |
bb009457 | 383 | dev_err(card->dev, "control %i:%i:%i:%s:%i is already present\n", |
1da177e4 LT |
384 | id.iface, |
385 | id.device, | |
386 | id.subdevice, | |
387 | id.name, | |
388 | id.index); | |
c6077b30 TI |
389 | err = -EBUSY; |
390 | goto error; | |
1da177e4 LT |
391 | } |
392 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
393 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
394 | err = -ENOMEM; |
395 | goto error; | |
1da177e4 LT |
396 | } |
397 | list_add_tail(&kcontrol->list, &card->controls); | |
398 | card->controls_count += kcontrol->count; | |
399 | kcontrol->id.numid = card->last_numid + 1; | |
400 | card->last_numid += kcontrol->count; | |
d34890cf | 401 | id = kcontrol->id; |
fd9f26e4 | 402 | count = kcontrol->count; |
1da177e4 | 403 | up_write(&card->controls_rwsem); |
fd9f26e4 | 404 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
1da177e4 LT |
405 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
406 | return 0; | |
c6077b30 TI |
407 | |
408 | error: | |
409 | snd_ctl_free_one(kcontrol); | |
410 | return err; | |
1da177e4 | 411 | } |
c0d3fb39 TI |
412 | EXPORT_SYMBOL(snd_ctl_add); |
413 | ||
66b5b972 DP |
414 | /** |
415 | * snd_ctl_replace - replace the control instance of the card | |
416 | * @card: the card instance | |
417 | * @kcontrol: the control instance to replace | |
418 | * @add_on_replace: add the control if not already added | |
419 | * | |
420 | * Replaces the given control. If the given control does not exist | |
421 | * and the add_on_replace flag is set, the control is added. If the | |
422 | * control exists, it is destroyed first. | |
423 | * | |
66b5b972 | 424 | * It frees automatically the control which cannot be added or replaced. |
eb7c06e8 YB |
425 | * |
426 | * Return: Zero if successful, or a negative error code on failure. | |
66b5b972 DP |
427 | */ |
428 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, | |
429 | bool add_on_replace) | |
430 | { | |
431 | struct snd_ctl_elem_id id; | |
fd9f26e4 | 432 | unsigned int count; |
66b5b972 DP |
433 | unsigned int idx; |
434 | struct snd_kcontrol *old; | |
435 | int ret; | |
436 | ||
437 | if (!kcontrol) | |
438 | return -EINVAL; | |
439 | if (snd_BUG_ON(!card || !kcontrol->info)) { | |
440 | ret = -EINVAL; | |
441 | goto error; | |
442 | } | |
443 | id = kcontrol->id; | |
444 | down_write(&card->controls_rwsem); | |
445 | old = snd_ctl_find_id(card, &id); | |
446 | if (!old) { | |
447 | if (add_on_replace) | |
448 | goto add; | |
449 | up_write(&card->controls_rwsem); | |
450 | ret = -EINVAL; | |
451 | goto error; | |
452 | } | |
453 | ret = snd_ctl_remove(card, old); | |
454 | if (ret < 0) { | |
455 | up_write(&card->controls_rwsem); | |
456 | goto error; | |
457 | } | |
458 | add: | |
459 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
460 | up_write(&card->controls_rwsem); | |
461 | ret = -ENOMEM; | |
462 | goto error; | |
463 | } | |
464 | list_add_tail(&kcontrol->list, &card->controls); | |
465 | card->controls_count += kcontrol->count; | |
466 | kcontrol->id.numid = card->last_numid + 1; | |
467 | card->last_numid += kcontrol->count; | |
e6ff3840 | 468 | id = kcontrol->id; |
fd9f26e4 | 469 | count = kcontrol->count; |
66b5b972 | 470 | up_write(&card->controls_rwsem); |
fd9f26e4 | 471 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
66b5b972 DP |
472 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
473 | return 0; | |
474 | ||
475 | error: | |
476 | snd_ctl_free_one(kcontrol); | |
477 | return ret; | |
478 | } | |
479 | EXPORT_SYMBOL(snd_ctl_replace); | |
480 | ||
1da177e4 LT |
481 | /** |
482 | * snd_ctl_remove - remove the control from the card and release it | |
483 | * @card: the card instance | |
484 | * @kcontrol: the control instance to remove | |
485 | * | |
486 | * Removes the control from the card and then releases the instance. | |
487 | * You don't need to call snd_ctl_free_one(). You must be in | |
488 | * the write lock - down_write(&card->controls_rwsem). | |
eb7c06e8 YB |
489 | * |
490 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 491 | */ |
82e9bae6 | 492 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 493 | { |
82e9bae6 | 494 | struct snd_ctl_elem_id id; |
1da177e4 LT |
495 | unsigned int idx; |
496 | ||
7eaa943c TI |
497 | if (snd_BUG_ON(!card || !kcontrol)) |
498 | return -EINVAL; | |
1da177e4 LT |
499 | list_del(&kcontrol->list); |
500 | card->controls_count -= kcontrol->count; | |
501 | id = kcontrol->id; | |
502 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
503 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
504 | snd_ctl_free_one(kcontrol); | |
505 | return 0; | |
506 | } | |
c0d3fb39 TI |
507 | EXPORT_SYMBOL(snd_ctl_remove); |
508 | ||
1da177e4 LT |
509 | /** |
510 | * snd_ctl_remove_id - remove the control of the given id and release it | |
511 | * @card: the card instance | |
512 | * @id: the control id to remove | |
513 | * | |
514 | * Finds the control instance with the given id, removes it from the | |
515 | * card list and releases it. | |
eb7c06e8 YB |
516 | * |
517 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 518 | */ |
82e9bae6 | 519 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 520 | { |
82e9bae6 | 521 | struct snd_kcontrol *kctl; |
1da177e4 LT |
522 | int ret; |
523 | ||
524 | down_write(&card->controls_rwsem); | |
525 | kctl = snd_ctl_find_id(card, id); | |
526 | if (kctl == NULL) { | |
527 | up_write(&card->controls_rwsem); | |
528 | return -ENOENT; | |
529 | } | |
530 | ret = snd_ctl_remove(card, kctl); | |
531 | up_write(&card->controls_rwsem); | |
532 | return ret; | |
533 | } | |
c0d3fb39 TI |
534 | EXPORT_SYMBOL(snd_ctl_remove_id); |
535 | ||
1da177e4 | 536 | /** |
f217ac59 | 537 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
538 | * @file: active control handle |
539 | * @id: the control id to remove | |
540 | * | |
541 | * Finds the control instance with the given id, removes it from the | |
542 | * card list and releases it. | |
eb7c06e8 YB |
543 | * |
544 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 545 | */ |
f217ac59 CL |
546 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
547 | struct snd_ctl_elem_id *id) | |
1da177e4 | 548 | { |
82e9bae6 TI |
549 | struct snd_card *card = file->card; |
550 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
551 | int idx, ret; |
552 | ||
553 | down_write(&card->controls_rwsem); | |
554 | kctl = snd_ctl_find_id(card, id); | |
555 | if (kctl == NULL) { | |
317b8081 CL |
556 | ret = -ENOENT; |
557 | goto error; | |
1da177e4 | 558 | } |
18dd0aa5 CL |
559 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
560 | ret = -EINVAL; | |
561 | goto error; | |
562 | } | |
1da177e4 LT |
563 | for (idx = 0; idx < kctl->count; idx++) |
564 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
565 | ret = -EBUSY; |
566 | goto error; | |
1da177e4 LT |
567 | } |
568 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
569 | if (ret < 0) |
570 | goto error; | |
571 | card->user_ctl_count--; | |
317b8081 | 572 | error: |
1da177e4 LT |
573 | up_write(&card->controls_rwsem); |
574 | return ret; | |
575 | } | |
576 | ||
3cbdd753 TI |
577 | /** |
578 | * snd_ctl_activate_id - activate/inactivate the control of the given id | |
579 | * @card: the card instance | |
580 | * @id: the control id to activate/inactivate | |
581 | * @active: non-zero to activate | |
582 | * | |
583 | * Finds the control instance with the given id, and activate or | |
584 | * inactivate the control together with notification, if changed. | |
c78497e0 | 585 | * The given ID data is filled with full information. |
3cbdd753 | 586 | * |
eb7c06e8 | 587 | * Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
3cbdd753 TI |
588 | */ |
589 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, | |
590 | int active) | |
591 | { | |
592 | struct snd_kcontrol *kctl; | |
593 | struct snd_kcontrol_volatile *vd; | |
594 | unsigned int index_offset; | |
595 | int ret; | |
596 | ||
597 | down_write(&card->controls_rwsem); | |
598 | kctl = snd_ctl_find_id(card, id); | |
599 | if (kctl == NULL) { | |
600 | ret = -ENOENT; | |
601 | goto unlock; | |
602 | } | |
31584ed1 | 603 | index_offset = snd_ctl_get_ioff(kctl, id); |
3cbdd753 TI |
604 | vd = &kctl->vd[index_offset]; |
605 | ret = 0; | |
606 | if (active) { | |
607 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) | |
608 | goto unlock; | |
609 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
610 | } else { | |
611 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) | |
612 | goto unlock; | |
613 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
614 | } | |
c78497e0 | 615 | snd_ctl_build_ioff(id, kctl, index_offset); |
3cbdd753 TI |
616 | ret = 1; |
617 | unlock: | |
618 | up_write(&card->controls_rwsem); | |
619 | if (ret > 0) | |
620 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); | |
621 | return ret; | |
622 | } | |
623 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); | |
624 | ||
1da177e4 LT |
625 | /** |
626 | * snd_ctl_rename_id - replace the id of a control on the card | |
627 | * @card: the card instance | |
628 | * @src_id: the old id | |
629 | * @dst_id: the new id | |
630 | * | |
631 | * Finds the control with the old id from the card, and replaces the | |
632 | * id with the new one. | |
633 | * | |
eb7c06e8 | 634 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 635 | */ |
82e9bae6 TI |
636 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
637 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 638 | { |
82e9bae6 | 639 | struct snd_kcontrol *kctl; |
1da177e4 LT |
640 | |
641 | down_write(&card->controls_rwsem); | |
642 | kctl = snd_ctl_find_id(card, src_id); | |
643 | if (kctl == NULL) { | |
644 | up_write(&card->controls_rwsem); | |
645 | return -ENOENT; | |
646 | } | |
647 | kctl->id = *dst_id; | |
648 | kctl->id.numid = card->last_numid + 1; | |
649 | card->last_numid += kctl->count; | |
650 | up_write(&card->controls_rwsem); | |
651 | return 0; | |
652 | } | |
c0d3fb39 TI |
653 | EXPORT_SYMBOL(snd_ctl_rename_id); |
654 | ||
1da177e4 LT |
655 | /** |
656 | * snd_ctl_find_numid - find the control instance with the given number-id | |
657 | * @card: the card instance | |
658 | * @numid: the number-id to search | |
659 | * | |
660 | * Finds the control instance with the given number-id from the card. | |
661 | * | |
1da177e4 LT |
662 | * The caller must down card->controls_rwsem before calling this function |
663 | * (if the race condition can happen). | |
eb7c06e8 YB |
664 | * |
665 | * Return: The pointer of the instance if found, or %NULL if not. | |
666 | * | |
1da177e4 | 667 | */ |
82e9bae6 | 668 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 669 | { |
82e9bae6 | 670 | struct snd_kcontrol *kctl; |
1da177e4 | 671 | |
7eaa943c TI |
672 | if (snd_BUG_ON(!card || !numid)) |
673 | return NULL; | |
9244b2c3 | 674 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
675 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
676 | return kctl; | |
677 | } | |
678 | return NULL; | |
679 | } | |
c0d3fb39 TI |
680 | EXPORT_SYMBOL(snd_ctl_find_numid); |
681 | ||
1da177e4 LT |
682 | /** |
683 | * snd_ctl_find_id - find the control instance with the given id | |
684 | * @card: the card instance | |
685 | * @id: the id to search | |
686 | * | |
687 | * Finds the control instance with the given id from the card. | |
688 | * | |
1da177e4 LT |
689 | * The caller must down card->controls_rwsem before calling this function |
690 | * (if the race condition can happen). | |
eb7c06e8 YB |
691 | * |
692 | * Return: The pointer of the instance if found, or %NULL if not. | |
693 | * | |
1da177e4 | 694 | */ |
82e9bae6 TI |
695 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
696 | struct snd_ctl_elem_id *id) | |
1da177e4 | 697 | { |
82e9bae6 | 698 | struct snd_kcontrol *kctl; |
1da177e4 | 699 | |
7eaa943c TI |
700 | if (snd_BUG_ON(!card || !id)) |
701 | return NULL; | |
1da177e4 LT |
702 | if (id->numid != 0) |
703 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 704 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
705 | if (kctl->id.iface != id->iface) |
706 | continue; | |
707 | if (kctl->id.device != id->device) | |
708 | continue; | |
709 | if (kctl->id.subdevice != id->subdevice) | |
710 | continue; | |
711 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
712 | continue; | |
713 | if (kctl->id.index > id->index) | |
714 | continue; | |
715 | if (kctl->id.index + kctl->count <= id->index) | |
716 | continue; | |
717 | return kctl; | |
718 | } | |
719 | return NULL; | |
720 | } | |
c0d3fb39 TI |
721 | EXPORT_SYMBOL(snd_ctl_find_id); |
722 | ||
82e9bae6 | 723 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
724 | unsigned int cmd, void __user *arg) |
725 | { | |
82e9bae6 | 726 | struct snd_ctl_card_info *info; |
1da177e4 | 727 | |
ca2c0966 | 728 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
729 | if (! info) |
730 | return -ENOMEM; | |
731 | down_read(&snd_ioctl_rwsem); | |
732 | info->card = card->number; | |
733 | strlcpy(info->id, card->id, sizeof(info->id)); | |
734 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
735 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
736 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
737 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
738 | strlcpy(info->components, card->components, sizeof(info->components)); | |
739 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 740 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
741 | kfree(info); |
742 | return -EFAULT; | |
743 | } | |
744 | kfree(info); | |
745 | return 0; | |
746 | } | |
747 | ||
82e9bae6 TI |
748 | static int snd_ctl_elem_list(struct snd_card *card, |
749 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 | 750 | { |
82e9bae6 TI |
751 | struct snd_ctl_elem_list list; |
752 | struct snd_kcontrol *kctl; | |
53e7bf45 | 753 | struct snd_ctl_elem_id id; |
78fa2c4d | 754 | unsigned int offset, space, jidx; |
53e7bf45 | 755 | int err = 0; |
1da177e4 LT |
756 | |
757 | if (copy_from_user(&list, _list, sizeof(list))) | |
758 | return -EFAULT; | |
759 | offset = list.offset; | |
760 | space = list.space; | |
4e361d3c | 761 | |
53e7bf45 TI |
762 | down_read(&card->controls_rwsem); |
763 | list.count = card->controls_count; | |
764 | list.used = 0; | |
1da177e4 | 765 | if (space > 0) { |
53e7bf45 TI |
766 | list_for_each_entry(kctl, &card->controls, list) { |
767 | if (offset >= kctl->count) { | |
768 | offset -= kctl->count; | |
769 | continue; | |
770 | } | |
771 | for (jidx = offset; jidx < kctl->count; jidx++) { | |
772 | snd_ctl_build_ioff(&id, kctl, jidx); | |
773 | if (copy_to_user(list.pids + list.used, &id, | |
774 | sizeof(id))) { | |
775 | err = -EFAULT; | |
776 | goto out; | |
777 | } | |
1da177e4 | 778 | list.used++; |
53e7bf45 TI |
779 | if (!--space) |
780 | goto out; | |
1da177e4 | 781 | } |
1da177e4 LT |
782 | offset = 0; |
783 | } | |
1da177e4 | 784 | } |
53e7bf45 TI |
785 | out: |
786 | up_read(&card->controls_rwsem); | |
787 | if (!err && copy_to_user(_list, &list, sizeof(list))) | |
788 | err = -EFAULT; | |
789 | return err; | |
1da177e4 LT |
790 | } |
791 | ||
860c1994 TS |
792 | static bool validate_element_member_dimension(struct snd_ctl_elem_info *info) |
793 | { | |
794 | unsigned int members; | |
795 | unsigned int i; | |
796 | ||
797 | if (info->dimen.d[0] == 0) | |
798 | return true; | |
799 | ||
800 | members = 1; | |
801 | for (i = 0; i < ARRAY_SIZE(info->dimen.d); ++i) { | |
802 | if (info->dimen.d[i] == 0) | |
803 | break; | |
804 | members *= info->dimen.d[i]; | |
805 | ||
806 | /* | |
807 | * info->count should be validated in advance, to guarantee | |
808 | * calculation soundness. | |
809 | */ | |
810 | if (members > info->count) | |
811 | return false; | |
812 | } | |
813 | ||
814 | for (++i; i < ARRAY_SIZE(info->dimen.d); ++i) { | |
815 | if (info->dimen.d[i] > 0) | |
816 | return false; | |
817 | } | |
818 | ||
819 | return members == info->count; | |
820 | } | |
821 | ||
82e9bae6 TI |
822 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
823 | struct snd_ctl_elem_info *info) | |
1da177e4 | 824 | { |
82e9bae6 TI |
825 | struct snd_card *card = ctl->card; |
826 | struct snd_kcontrol *kctl; | |
827 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
828 | unsigned int index_offset; |
829 | int result; | |
830 | ||
831 | down_read(&card->controls_rwsem); | |
832 | kctl = snd_ctl_find_id(card, &info->id); | |
833 | if (kctl == NULL) { | |
834 | up_read(&card->controls_rwsem); | |
835 | return -ENOENT; | |
836 | } | |
837 | #ifdef CONFIG_SND_DEBUG | |
838 | info->access = 0; | |
839 | #endif | |
840 | result = kctl->info(kctl, info); | |
841 | if (result >= 0) { | |
7eaa943c | 842 | snd_BUG_ON(info->access); |
1da177e4 LT |
843 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
844 | vd = &kctl->vd[index_offset]; | |
845 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
846 | info->access = vd->access; | |
847 | if (vd->owner) { | |
848 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
849 | if (vd->owner == ctl) | |
850 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 851 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
852 | } else { |
853 | info->owner = -1; | |
854 | } | |
855 | } | |
856 | up_read(&card->controls_rwsem); | |
857 | return result; | |
858 | } | |
859 | ||
82e9bae6 TI |
860 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
861 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 862 | { |
82e9bae6 | 863 | struct snd_ctl_elem_info info; |
1da177e4 LT |
864 | int result; |
865 | ||
866 | if (copy_from_user(&info, _info, sizeof(info))) | |
867 | return -EFAULT; | |
cbac4b0c | 868 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
869 | if (result < 0) |
870 | return result; | |
871 | result = snd_ctl_elem_info(ctl, &info); | |
872 | if (result < 0) | |
873 | return result; | |
874 | if (copy_to_user(_info, &info, sizeof(info))) | |
875 | return -EFAULT; | |
1da177e4 LT |
876 | return result; |
877 | } | |
878 | ||
d3bd67cd TI |
879 | static int snd_ctl_elem_read(struct snd_card *card, |
880 | struct snd_ctl_elem_value *control) | |
1da177e4 | 881 | { |
82e9bae6 TI |
882 | struct snd_kcontrol *kctl; |
883 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 884 | unsigned int index_offset; |
1da177e4 | 885 | |
1da177e4 | 886 | kctl = snd_ctl_find_id(card, &control->id); |
becf9e5d TS |
887 | if (kctl == NULL) |
888 | return -ENOENT; | |
889 | ||
890 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
891 | vd = &kctl->vd[index_offset]; | |
5a23699a | 892 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_READ) || kctl->get == NULL) |
becf9e5d TS |
893 | return -EPERM; |
894 | ||
895 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
896 | return kctl->get(kctl, control); | |
1da177e4 LT |
897 | } |
898 | ||
82e9bae6 TI |
899 | static int snd_ctl_elem_read_user(struct snd_card *card, |
900 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 901 | { |
82e9bae6 | 902 | struct snd_ctl_elem_value *control; |
1da177e4 | 903 | int result; |
ef44a1ec LZ |
904 | |
905 | control = memdup_user(_control, sizeof(*control)); | |
906 | if (IS_ERR(control)) | |
907 | return PTR_ERR(control); | |
908 | ||
cbac4b0c | 909 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
910 | if (result < 0) |
911 | goto error; | |
912 | ||
913 | down_read(&card->controls_rwsem); | |
914 | result = snd_ctl_elem_read(card, control); | |
915 | up_read(&card->controls_rwsem); | |
916 | if (result < 0) | |
917 | goto error; | |
918 | ||
919 | if (copy_to_user(_control, control, sizeof(*control))) | |
920 | result = -EFAULT; | |
921 | error: | |
1da177e4 LT |
922 | kfree(control); |
923 | return result; | |
924 | } | |
925 | ||
d3bd67cd TI |
926 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
927 | struct snd_ctl_elem_value *control) | |
1da177e4 | 928 | { |
82e9bae6 TI |
929 | struct snd_kcontrol *kctl; |
930 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 931 | unsigned int index_offset; |
8ace4f3c | 932 | int result; |
1da177e4 | 933 | |
1da177e4 | 934 | kctl = snd_ctl_find_id(card, &control->id); |
becf9e5d TS |
935 | if (kctl == NULL) |
936 | return -ENOENT; | |
937 | ||
938 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
939 | vd = &kctl->vd[index_offset]; | |
940 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || kctl->put == NULL || | |
941 | (file && vd->owner && vd->owner != file)) { | |
942 | return -EPERM; | |
1da177e4 | 943 | } |
becf9e5d TS |
944 | |
945 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
946 | result = kctl->put(kctl, control); | |
947 | if (result < 0) | |
948 | return result; | |
949 | ||
950 | if (result > 0) { | |
951 | struct snd_ctl_elem_id id = control->id; | |
952 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id); | |
953 | } | |
954 | ||
955 | return 0; | |
1da177e4 LT |
956 | } |
957 | ||
82e9bae6 TI |
958 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
959 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 960 | { |
82e9bae6 | 961 | struct snd_ctl_elem_value *control; |
64649400 | 962 | struct snd_card *card; |
1da177e4 LT |
963 | int result; |
964 | ||
ef44a1ec LZ |
965 | control = memdup_user(_control, sizeof(*control)); |
966 | if (IS_ERR(control)) | |
967 | return PTR_ERR(control); | |
968 | ||
64649400 | 969 | card = file->card; |
cbac4b0c | 970 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
971 | if (result < 0) |
972 | goto error; | |
973 | ||
974 | down_write(&card->controls_rwsem); | |
975 | result = snd_ctl_elem_write(card, file, control); | |
976 | up_write(&card->controls_rwsem); | |
977 | if (result < 0) | |
978 | goto error; | |
979 | ||
980 | if (copy_to_user(_control, control, sizeof(*control))) | |
981 | result = -EFAULT; | |
982 | error: | |
1da177e4 LT |
983 | kfree(control); |
984 | return result; | |
985 | } | |
986 | ||
82e9bae6 TI |
987 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
988 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 989 | { |
82e9bae6 TI |
990 | struct snd_card *card = file->card; |
991 | struct snd_ctl_elem_id id; | |
992 | struct snd_kcontrol *kctl; | |
993 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
994 | int result; |
995 | ||
996 | if (copy_from_user(&id, _id, sizeof(id))) | |
997 | return -EFAULT; | |
998 | down_write(&card->controls_rwsem); | |
999 | kctl = snd_ctl_find_id(card, &id); | |
1000 | if (kctl == NULL) { | |
1001 | result = -ENOENT; | |
1002 | } else { | |
1003 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
1004 | if (vd->owner != NULL) | |
1005 | result = -EBUSY; | |
1006 | else { | |
1007 | vd->owner = file; | |
1da177e4 LT |
1008 | result = 0; |
1009 | } | |
1010 | } | |
1011 | up_write(&card->controls_rwsem); | |
1012 | return result; | |
1013 | } | |
1014 | ||
82e9bae6 TI |
1015 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
1016 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1017 | { |
82e9bae6 TI |
1018 | struct snd_card *card = file->card; |
1019 | struct snd_ctl_elem_id id; | |
1020 | struct snd_kcontrol *kctl; | |
1021 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
1022 | int result; |
1023 | ||
1024 | if (copy_from_user(&id, _id, sizeof(id))) | |
1025 | return -EFAULT; | |
1026 | down_write(&card->controls_rwsem); | |
1027 | kctl = snd_ctl_find_id(card, &id); | |
1028 | if (kctl == NULL) { | |
1029 | result = -ENOENT; | |
1030 | } else { | |
1031 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
1032 | if (vd->owner == NULL) | |
1033 | result = -EINVAL; | |
1034 | else if (vd->owner != file) | |
1035 | result = -EPERM; | |
1036 | else { | |
1037 | vd->owner = NULL; | |
1da177e4 LT |
1038 | result = 0; |
1039 | } | |
1040 | } | |
1041 | up_write(&card->controls_rwsem); | |
1042 | return result; | |
1043 | } | |
1044 | ||
1045 | struct user_element { | |
82e9bae6 | 1046 | struct snd_ctl_elem_info info; |
07f4d9d7 | 1047 | struct snd_card *card; |
e1c78df1 | 1048 | char *elem_data; /* element data */ |
1da177e4 | 1049 | unsigned long elem_data_size; /* size of element data in bytes */ |
8aa9b586 JK |
1050 | void *tlv_data; /* TLV data */ |
1051 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 | 1052 | void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4 LT |
1053 | }; |
1054 | ||
82e9bae6 TI |
1055 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
1056 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
1057 | { |
1058 | struct user_element *ue = kcontrol->private_data; | |
c378c3b0 | 1059 | unsigned int offset; |
1da177e4 | 1060 | |
c378c3b0 | 1061 | offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
1da177e4 | 1062 | *uinfo = ue->info; |
c378c3b0 TS |
1063 | snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
1064 | ||
1da177e4 LT |
1065 | return 0; |
1066 | } | |
1067 | ||
8d448162 CL |
1068 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
1069 | struct snd_ctl_elem_info *uinfo) | |
1070 | { | |
1071 | struct user_element *ue = kcontrol->private_data; | |
1072 | const char *names; | |
1073 | unsigned int item; | |
c378c3b0 | 1074 | unsigned int offset; |
8d448162 CL |
1075 | |
1076 | item = uinfo->value.enumerated.item; | |
1077 | ||
c378c3b0 | 1078 | offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
8d448162 | 1079 | *uinfo = ue->info; |
c378c3b0 | 1080 | snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
8d448162 CL |
1081 | |
1082 | item = min(item, uinfo->value.enumerated.items - 1); | |
1083 | uinfo->value.enumerated.item = item; | |
1084 | ||
1085 | names = ue->priv_data; | |
1086 | for (; item > 0; --item) | |
1087 | names += strlen(names) + 1; | |
1088 | strcpy(uinfo->value.enumerated.name, names); | |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
82e9bae6 TI |
1093 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
1094 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1095 | { |
1096 | struct user_element *ue = kcontrol->private_data; | |
e1c78df1 TS |
1097 | unsigned int size = ue->elem_data_size; |
1098 | char *src = ue->elem_data + | |
1099 | snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; | |
1da177e4 | 1100 | |
e1c78df1 | 1101 | memcpy(&ucontrol->value, src, size); |
1da177e4 LT |
1102 | return 0; |
1103 | } | |
1104 | ||
82e9bae6 TI |
1105 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
1106 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1107 | { |
1108 | int change; | |
1109 | struct user_element *ue = kcontrol->private_data; | |
e1c78df1 TS |
1110 | unsigned int size = ue->elem_data_size; |
1111 | char *dst = ue->elem_data + | |
1112 | snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; | |
07f4d9d7 | 1113 | |
e1c78df1 | 1114 | change = memcmp(&ucontrol->value, dst, size) != 0; |
1da177e4 | 1115 | if (change) |
e1c78df1 | 1116 | memcpy(dst, &ucontrol->value, size); |
1da177e4 LT |
1117 | return change; |
1118 | } | |
1119 | ||
6d4d41f0 TS |
1120 | static int replace_user_tlv(struct snd_kcontrol *kctl, unsigned int __user *buf, |
1121 | unsigned int size) | |
8aa9b586 | 1122 | { |
6d4d41f0 TS |
1123 | struct user_element *ue = kctl->private_data; |
1124 | unsigned int *container; | |
da428828 | 1125 | struct snd_ctl_elem_id id; |
b8e2204b | 1126 | unsigned int mask = 0; |
da428828 | 1127 | int i; |
6d4d41f0 | 1128 | int change; |
8aa9b586 | 1129 | |
6d4d41f0 TS |
1130 | if (size > 1024 * 128) /* sane value */ |
1131 | return -EINVAL; | |
30d8340b | 1132 | |
88a89037 | 1133 | container = vmemdup_user(buf, size); |
6d4d41f0 TS |
1134 | if (IS_ERR(container)) |
1135 | return PTR_ERR(container); | |
ef44a1ec | 1136 | |
6d4d41f0 TS |
1137 | change = ue->tlv_data_size != size; |
1138 | if (!change) | |
241bc82e | 1139 | change = memcmp(ue->tlv_data, container, size) != 0; |
6d4d41f0 | 1140 | if (!change) { |
88a89037 | 1141 | kvfree(container); |
6d4d41f0 TS |
1142 | return 0; |
1143 | } | |
30d8340b | 1144 | |
b8e2204b TS |
1145 | if (ue->tlv_data == NULL) { |
1146 | /* Now TLV data is available. */ | |
1147 | for (i = 0; i < kctl->count; ++i) | |
1148 | kctl->vd[i].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ; | |
1149 | mask = SNDRV_CTL_EVENT_MASK_INFO; | |
1150 | } | |
1151 | ||
88a89037 | 1152 | kvfree(ue->tlv_data); |
6d4d41f0 TS |
1153 | ue->tlv_data = container; |
1154 | ue->tlv_data_size = size; | |
07f4d9d7 | 1155 | |
b8e2204b | 1156 | mask |= SNDRV_CTL_EVENT_MASK_TLV; |
da428828 TS |
1157 | for (i = 0; i < kctl->count; ++i) { |
1158 | snd_ctl_build_ioff(&id, kctl, i); | |
b8e2204b | 1159 | snd_ctl_notify(ue->card, mask, &id); |
da428828 | 1160 | } |
fb8027eb | 1161 | |
6d4d41f0 TS |
1162 | return change; |
1163 | } | |
30d8340b | 1164 | |
6d4d41f0 TS |
1165 | static int read_user_tlv(struct snd_kcontrol *kctl, unsigned int __user *buf, |
1166 | unsigned int size) | |
1167 | { | |
1168 | struct user_element *ue = kctl->private_data; | |
1169 | ||
1170 | if (ue->tlv_data_size == 0 || ue->tlv_data == NULL) | |
1171 | return -ENXIO; | |
1172 | ||
1173 | if (size < ue->tlv_data_size) | |
1174 | return -ENOSPC; | |
1175 | ||
1176 | if (copy_to_user(buf, ue->tlv_data, ue->tlv_data_size)) | |
1177 | return -EFAULT; | |
1178 | ||
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kctl, int op_flag, | |
1183 | unsigned int size, unsigned int __user *buf) | |
1184 | { | |
1185 | if (op_flag == SNDRV_CTL_TLV_OP_WRITE) | |
1186 | return replace_user_tlv(kctl, buf, size); | |
1187 | else | |
1188 | return read_user_tlv(kctl, buf, size); | |
8aa9b586 JK |
1189 | } |
1190 | ||
8d448162 CL |
1191 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
1192 | { | |
1193 | char *names, *p; | |
1194 | size_t buf_len, name_len; | |
1195 | unsigned int i; | |
447c6f93 | 1196 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162 CL |
1197 | |
1198 | if (ue->info.value.enumerated.names_length > 64 * 1024) | |
1199 | return -EINVAL; | |
1200 | ||
59aeaf3f | 1201 | names = vmemdup_user((const void __user *)user_ptrval, |
8d448162 CL |
1202 | ue->info.value.enumerated.names_length); |
1203 | if (IS_ERR(names)) | |
1204 | return PTR_ERR(names); | |
1205 | ||
1206 | /* check that there are enough valid names */ | |
1207 | buf_len = ue->info.value.enumerated.names_length; | |
1208 | p = names; | |
1209 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { | |
1210 | name_len = strnlen(p, buf_len); | |
1211 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { | |
59aeaf3f | 1212 | kvfree(names); |
8d448162 CL |
1213 | return -EINVAL; |
1214 | } | |
1215 | p += name_len + 1; | |
1216 | buf_len -= name_len + 1; | |
1217 | } | |
1218 | ||
1219 | ue->priv_data = names; | |
1220 | ue->info.value.enumerated.names_ptr = 0; | |
1221 | ||
1222 | return 0; | |
1223 | } | |
1224 | ||
82e9bae6 | 1225 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 1226 | { |
8aa9b586 | 1227 | struct user_element *ue = kcontrol->private_data; |
8d448162 | 1228 | |
88a89037 | 1229 | kvfree(ue->tlv_data); |
59aeaf3f | 1230 | kvfree(ue->priv_data); |
8aa9b586 | 1231 | kfree(ue); |
1da177e4 LT |
1232 | } |
1233 | ||
82e9bae6 TI |
1234 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
1235 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 1236 | { |
4ed56666 TS |
1237 | /* The capacity of struct snd_ctl_elem_value.value.*/ |
1238 | static const unsigned int value_sizes[] = { | |
1239 | [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = sizeof(long), | |
1240 | [SNDRV_CTL_ELEM_TYPE_INTEGER] = sizeof(long), | |
1241 | [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = sizeof(unsigned int), | |
1242 | [SNDRV_CTL_ELEM_TYPE_BYTES] = sizeof(unsigned char), | |
1243 | [SNDRV_CTL_ELEM_TYPE_IEC958] = sizeof(struct snd_aes_iec958), | |
1244 | [SNDRV_CTL_ELEM_TYPE_INTEGER64] = sizeof(long long), | |
1245 | }; | |
1246 | static const unsigned int max_value_counts[] = { | |
1247 | [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = 128, | |
1248 | [SNDRV_CTL_ELEM_TYPE_INTEGER] = 128, | |
1249 | [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = 128, | |
1250 | [SNDRV_CTL_ELEM_TYPE_BYTES] = 512, | |
1251 | [SNDRV_CTL_ELEM_TYPE_IEC958] = 1, | |
1252 | [SNDRV_CTL_ELEM_TYPE_INTEGER64] = 64, | |
1253 | }; | |
82e9bae6 | 1254 | struct snd_card *card = file->card; |
2225e79b TS |
1255 | struct snd_kcontrol *kctl; |
1256 | unsigned int count; | |
1da177e4 LT |
1257 | unsigned int access; |
1258 | long private_size; | |
1259 | struct user_element *ue; | |
cab2ed74 | 1260 | unsigned int offset; |
2225e79b | 1261 | int err; |
82262a46 | 1262 | |
be3bb823 TI |
1263 | if (!*info->id.name) |
1264 | return -EINVAL; | |
1265 | if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name)) | |
1266 | return -EINVAL; | |
82262a46 | 1267 | |
2225e79b | 1268 | /* Delete a control to replace them if needed. */ |
82262a46 | 1269 | if (replace) { |
2225e79b | 1270 | info->id.numid = 0; |
82262a46 LPC |
1271 | err = snd_ctl_remove_user_ctl(file, &info->id); |
1272 | if (err) | |
1273 | return err; | |
1da177e4 | 1274 | } |
82262a46 | 1275 | |
2225e79b TS |
1276 | /* |
1277 | * The number of userspace controls are counted control by control, | |
1278 | * not element by element. | |
1279 | */ | |
1280 | if (card->user_ctl_count + 1 > MAX_USER_CONTROLS) | |
82262a46 LPC |
1281 | return -ENOMEM; |
1282 | ||
2225e79b TS |
1283 | /* Check the number of elements for this userspace control. */ |
1284 | count = info->owner; | |
1285 | if (count == 0) | |
1286 | count = 1; | |
1287 | ||
1288 | /* Arrange access permissions if needed. */ | |
1289 | access = info->access; | |
1290 | if (access == 0) | |
1291 | access = SNDRV_CTL_ELEM_ACCESS_READWRITE; | |
1292 | access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | | |
1293 | SNDRV_CTL_ELEM_ACCESS_INACTIVE | | |
b8e2204b TS |
1294 | SNDRV_CTL_ELEM_ACCESS_TLV_WRITE); |
1295 | ||
1296 | /* In initial state, nothing is available as TLV container. */ | |
1297 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) | |
8aa9b586 | 1298 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; |
2225e79b | 1299 | access |= SNDRV_CTL_ELEM_ACCESS_USER; |
4ed56666 | 1300 | |
2225e79b TS |
1301 | /* |
1302 | * Check information and calculate the size of data specific to | |
1303 | * this userspace control. | |
1304 | */ | |
4ed56666 TS |
1305 | if (info->type < SNDRV_CTL_ELEM_TYPE_BOOLEAN || |
1306 | info->type > SNDRV_CTL_ELEM_TYPE_INTEGER64) | |
1da177e4 | 1307 | return -EINVAL; |
4ed56666 TS |
1308 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED && |
1309 | info->value.enumerated.items == 0) | |
1310 | return -EINVAL; | |
1311 | if (info->count < 1 || | |
1312 | info->count > max_value_counts[info->type]) | |
1313 | return -EINVAL; | |
860c1994 TS |
1314 | if (!validate_element_member_dimension(info)) |
1315 | return -EINVAL; | |
4ed56666 | 1316 | private_size = value_sizes[info->type] * info->count; |
2225e79b TS |
1317 | |
1318 | /* | |
1319 | * Keep memory object for this userspace control. After passing this | |
1320 | * code block, the instance should be freed by snd_ctl_free_one(). | |
1321 | * | |
1322 | * Note that these elements in this control are locked. | |
1323 | */ | |
1324 | err = snd_ctl_new(&kctl, count, access, file); | |
1325 | if (err < 0) | |
1326 | return err; | |
e79d74ab | 1327 | memcpy(&kctl->id, &info->id, sizeof(kctl->id)); |
e1c78df1 | 1328 | kctl->private_data = kzalloc(sizeof(struct user_element) + private_size * count, |
2225e79b TS |
1329 | GFP_KERNEL); |
1330 | if (kctl->private_data == NULL) { | |
1331 | kfree(kctl); | |
1da177e4 | 1332 | return -ENOMEM; |
2225e79b TS |
1333 | } |
1334 | kctl->private_free = snd_ctl_elem_user_free; | |
1335 | ||
1336 | /* Set private data for this userspace control. */ | |
1337 | ue = (struct user_element *)kctl->private_data; | |
07f4d9d7 | 1338 | ue->card = card; |
1da177e4 | 1339 | ue->info = *info; |
86148e84 | 1340 | ue->info.access = 0; |
1da177e4 LT |
1341 | ue->elem_data = (char *)ue + sizeof(*ue); |
1342 | ue->elem_data_size = private_size; | |
8d448162 CL |
1343 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
1344 | err = snd_ctl_elem_init_enum_names(ue); | |
1345 | if (err < 0) { | |
2225e79b | 1346 | snd_ctl_free_one(kctl); |
8d448162 CL |
1347 | return err; |
1348 | } | |
1349 | } | |
2225e79b TS |
1350 | |
1351 | /* Set callback functions. */ | |
1352 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) | |
1353 | kctl->info = snd_ctl_elem_user_enum_info; | |
1354 | else | |
1355 | kctl->info = snd_ctl_elem_user_info; | |
1356 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
1357 | kctl->get = snd_ctl_elem_user_get; | |
1358 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
1359 | kctl->put = snd_ctl_elem_user_put; | |
b8e2204b | 1360 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) |
2225e79b TS |
1361 | kctl->tlv.c = snd_ctl_elem_user_tlv; |
1362 | ||
1363 | /* This function manage to free the instance on failure. */ | |
1364 | err = snd_ctl_add(card, kctl); | |
2fbf182e | 1365 | if (err < 0) |
1da177e4 | 1366 | return err; |
cab2ed74 TS |
1367 | offset = snd_ctl_get_ioff(kctl, &info->id); |
1368 | snd_ctl_build_ioff(&info->id, kctl, offset); | |
1369 | /* | |
1370 | * Here we cannot fill any field for the number of elements added by | |
1371 | * this operation because there're no specific fields. The usage of | |
1372 | * 'owner' field for this purpose may cause any bugs to userspace | |
1373 | * applications because the field originally means PID of a process | |
1374 | * which locks the element. | |
1375 | */ | |
1da177e4 LT |
1376 | |
1377 | down_write(&card->controls_rwsem); | |
1378 | card->user_ctl_count++; | |
1379 | up_write(&card->controls_rwsem); | |
1380 | ||
1381 | return 0; | |
1382 | } | |
1383 | ||
82e9bae6 TI |
1384 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1385 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1386 | { |
82e9bae6 | 1387 | struct snd_ctl_elem_info info; |
cab2ed74 TS |
1388 | int err; |
1389 | ||
1da177e4 LT |
1390 | if (copy_from_user(&info, _info, sizeof(info))) |
1391 | return -EFAULT; | |
cab2ed74 TS |
1392 | err = snd_ctl_elem_add(file, &info, replace); |
1393 | if (err < 0) | |
1394 | return err; | |
1395 | if (copy_to_user(_info, &info, sizeof(info))) { | |
1396 | snd_ctl_remove_user_ctl(file, &info.id); | |
1397 | return -EFAULT; | |
1398 | } | |
1399 | ||
1400 | return 0; | |
1da177e4 LT |
1401 | } |
1402 | ||
82e9bae6 TI |
1403 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1404 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1405 | { |
82e9bae6 | 1406 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1407 | |
1408 | if (copy_from_user(&id, _id, sizeof(id))) | |
1409 | return -EFAULT; | |
f217ac59 | 1410 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1411 | } |
1412 | ||
82e9bae6 | 1413 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1414 | { |
1415 | int subscribe; | |
1416 | if (get_user(subscribe, ptr)) | |
1417 | return -EFAULT; | |
1418 | if (subscribe < 0) { | |
1419 | subscribe = file->subscribed; | |
1420 | if (put_user(subscribe, ptr)) | |
1421 | return -EFAULT; | |
1422 | return 0; | |
1423 | } | |
1424 | if (subscribe) { | |
1425 | file->subscribed = 1; | |
1426 | return 0; | |
1427 | } else if (file->subscribed) { | |
1428 | snd_ctl_empty_read_queue(file); | |
1429 | file->subscribed = 0; | |
1430 | } | |
1431 | return 0; | |
1432 | } | |
1433 | ||
450296f3 TS |
1434 | static int call_tlv_handler(struct snd_ctl_file *file, int op_flag, |
1435 | struct snd_kcontrol *kctl, | |
1436 | struct snd_ctl_elem_id *id, | |
1437 | unsigned int __user *buf, unsigned int size) | |
1438 | { | |
1439 | static const struct { | |
1440 | int op; | |
1441 | int perm; | |
1442 | } pairs[] = { | |
1443 | {SNDRV_CTL_TLV_OP_READ, SNDRV_CTL_ELEM_ACCESS_TLV_READ}, | |
1444 | {SNDRV_CTL_TLV_OP_WRITE, SNDRV_CTL_ELEM_ACCESS_TLV_WRITE}, | |
1445 | {SNDRV_CTL_TLV_OP_CMD, SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND}, | |
1446 | }; | |
1447 | struct snd_kcontrol_volatile *vd = &kctl->vd[snd_ctl_get_ioff(kctl, id)]; | |
1448 | int i; | |
450296f3 TS |
1449 | |
1450 | /* Check support of the request for this element. */ | |
1451 | for (i = 0; i < ARRAY_SIZE(pairs); ++i) { | |
1452 | if (op_flag == pairs[i].op && (vd->access & pairs[i].perm)) | |
1453 | break; | |
1454 | } | |
1455 | if (i == ARRAY_SIZE(pairs)) | |
1456 | return -ENXIO; | |
1457 | ||
1458 | if (kctl->tlv.c == NULL) | |
1459 | return -ENXIO; | |
1460 | ||
1461 | /* When locked, this is unavailable. */ | |
1462 | if (vd->owner != NULL && vd->owner != file) | |
1463 | return -EPERM; | |
1464 | ||
fb8027eb | 1465 | return kctl->tlv.c(kctl, op_flag, size, buf); |
450296f3 TS |
1466 | } |
1467 | ||
1468 | static int read_tlv_buf(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id, | |
1469 | unsigned int __user *buf, unsigned int size) | |
1470 | { | |
1471 | struct snd_kcontrol_volatile *vd = &kctl->vd[snd_ctl_get_ioff(kctl, id)]; | |
1472 | unsigned int len; | |
1473 | ||
1474 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ)) | |
1475 | return -ENXIO; | |
1476 | ||
1477 | if (kctl->tlv.p == NULL) | |
1478 | return -ENXIO; | |
1479 | ||
1480 | len = sizeof(unsigned int) * 2 + kctl->tlv.p[1]; | |
1481 | if (size < len) | |
1482 | return -ENOMEM; | |
1483 | ||
1484 | if (copy_to_user(buf, kctl->tlv.p, len)) | |
1485 | return -EFAULT; | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
8aa9b586 | 1490 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
450296f3 | 1491 | struct snd_ctl_tlv __user *buf, |
8aa9b586 | 1492 | int op_flag) |
42750b04 | 1493 | { |
450296f3 TS |
1494 | struct snd_ctl_tlv header; |
1495 | unsigned int *container; | |
1496 | unsigned int container_size; | |
42750b04 | 1497 | struct snd_kcontrol *kctl; |
450296f3 | 1498 | struct snd_ctl_elem_id id; |
8aa9b586 | 1499 | struct snd_kcontrol_volatile *vd; |
42750b04 | 1500 | |
450296f3 | 1501 | if (copy_from_user(&header, buf, sizeof(header))) |
42750b04 | 1502 | return -EFAULT; |
450296f3 TS |
1503 | |
1504 | /* In design of control core, numerical ID starts at 1. */ | |
1505 | if (header.numid == 0) | |
8aa9b586 | 1506 | return -EINVAL; |
450296f3 TS |
1507 | |
1508 | /* At least, container should include type and length fields. */ | |
1509 | if (header.length < sizeof(unsigned int) * 2) | |
c0bcdbdf | 1510 | return -EINVAL; |
450296f3 TS |
1511 | container_size = header.length; |
1512 | container = buf->tlv; | |
4c8099e9 | 1513 | |
450296f3 | 1514 | kctl = snd_ctl_find_numid(file->card, header.numid); |
4c8099e9 TS |
1515 | if (kctl == NULL) |
1516 | return -ENOENT; | |
1517 | ||
450296f3 TS |
1518 | /* Calculate index of the element in this set. */ |
1519 | id = kctl->id; | |
1520 | snd_ctl_build_ioff(&id, kctl, header.numid - id.numid); | |
1521 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
4c8099e9 | 1522 | |
8aa9b586 | 1523 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { |
450296f3 TS |
1524 | return call_tlv_handler(file, op_flag, kctl, &id, container, |
1525 | container_size); | |
8aa9b586 | 1526 | } else { |
450296f3 TS |
1527 | if (op_flag == SNDRV_CTL_TLV_OP_READ) { |
1528 | return read_tlv_buf(kctl, &id, container, | |
1529 | container_size); | |
1530 | } | |
8aa9b586 | 1531 | } |
4c8099e9 | 1532 | |
450296f3 TS |
1533 | /* Not supported. */ |
1534 | return -ENXIO; | |
42750b04 JK |
1535 | } |
1536 | ||
1da177e4 LT |
1537 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1538 | { | |
82e9bae6 TI |
1539 | struct snd_ctl_file *ctl; |
1540 | struct snd_card *card; | |
82e9bae6 | 1541 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1542 | void __user *argp = (void __user *)arg; |
1543 | int __user *ip = argp; | |
1544 | int err; | |
1545 | ||
1546 | ctl = file->private_data; | |
1547 | card = ctl->card; | |
7eaa943c TI |
1548 | if (snd_BUG_ON(!card)) |
1549 | return -ENXIO; | |
1da177e4 LT |
1550 | switch (cmd) { |
1551 | case SNDRV_CTL_IOCTL_PVERSION: | |
1552 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1553 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1554 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1555 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1556 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1557 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1558 | return snd_ctl_elem_info_user(ctl, argp); | |
1559 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1560 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1561 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1562 | return snd_ctl_elem_write_user(ctl, argp); | |
1563 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1564 | return snd_ctl_elem_lock(ctl, argp); | |
1565 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1566 | return snd_ctl_elem_unlock(ctl, argp); | |
1567 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1568 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1569 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1570 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1571 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1572 | return snd_ctl_elem_remove(ctl, argp); | |
1573 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1574 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 | 1575 | case SNDRV_CTL_IOCTL_TLV_READ: |
4c8099e9 TS |
1576 | down_read(&ctl->card->controls_rwsem); |
1577 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ); | |
1578 | up_read(&ctl->card->controls_rwsem); | |
1579 | return err; | |
8aa9b586 | 1580 | case SNDRV_CTL_IOCTL_TLV_WRITE: |
4c8099e9 TS |
1581 | down_write(&ctl->card->controls_rwsem); |
1582 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE); | |
1583 | up_write(&ctl->card->controls_rwsem); | |
1584 | return err; | |
8aa9b586 | 1585 | case SNDRV_CTL_IOCTL_TLV_COMMAND: |
4c8099e9 TS |
1586 | down_write(&ctl->card->controls_rwsem); |
1587 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD); | |
1588 | up_write(&ctl->card->controls_rwsem); | |
1589 | return err; | |
1da177e4 | 1590 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1591 | return -ENOPROTOOPT; |
1da177e4 LT |
1592 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1593 | #ifdef CONFIG_PM | |
1594 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1595 | #else | |
1596 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1597 | #endif | |
1598 | } | |
1599 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1600 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1601 | err = p->fioctl(card, ctl, cmd, arg); |
1602 | if (err != -ENOIOCTLCMD) { | |
1603 | up_read(&snd_ioctl_rwsem); | |
1604 | return err; | |
1605 | } | |
1606 | } | |
1607 | up_read(&snd_ioctl_rwsem); | |
bb009457 | 1608 | dev_dbg(card->dev, "unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1609 | return -ENOTTY; |
1610 | } | |
1611 | ||
82e9bae6 TI |
1612 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1613 | size_t count, loff_t * offset) | |
1da177e4 | 1614 | { |
82e9bae6 | 1615 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1616 | int err = 0; |
1617 | ssize_t result = 0; | |
1618 | ||
1619 | ctl = file->private_data; | |
7eaa943c TI |
1620 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1621 | return -ENXIO; | |
1da177e4 LT |
1622 | if (!ctl->subscribed) |
1623 | return -EBADFD; | |
82e9bae6 | 1624 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1625 | return -EINVAL; |
1626 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1627 | while (count >= sizeof(struct snd_ctl_event)) { |
1628 | struct snd_ctl_event ev; | |
1629 | struct snd_kctl_event *kev; | |
1da177e4 | 1630 | while (list_empty(&ctl->events)) { |
ac6424b9 | 1631 | wait_queue_entry_t wait; |
1da177e4 LT |
1632 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
1633 | err = -EAGAIN; | |
1634 | goto __end_lock; | |
1635 | } | |
1636 | init_waitqueue_entry(&wait, current); | |
1637 | add_wait_queue(&ctl->change_sleep, &wait); | |
1638 | set_current_state(TASK_INTERRUPTIBLE); | |
1639 | spin_unlock_irq(&ctl->read_lock); | |
1640 | schedule(); | |
1641 | remove_wait_queue(&ctl->change_sleep, &wait); | |
0914f796 TI |
1642 | if (ctl->card->shutdown) |
1643 | return -ENODEV; | |
1da177e4 | 1644 | if (signal_pending(current)) |
0e5d720c | 1645 | return -ERESTARTSYS; |
1da177e4 LT |
1646 | spin_lock_irq(&ctl->read_lock); |
1647 | } | |
1648 | kev = snd_kctl_event(ctl->events.next); | |
1649 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1650 | ev.data.elem.mask = kev->mask; | |
1651 | ev.data.elem.id = kev->id; | |
1652 | list_del(&kev->list); | |
1653 | spin_unlock_irq(&ctl->read_lock); | |
1654 | kfree(kev); | |
82e9bae6 | 1655 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1656 | err = -EFAULT; |
1657 | goto __end; | |
1658 | } | |
1659 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1660 | buffer += sizeof(struct snd_ctl_event); |
1661 | count -= sizeof(struct snd_ctl_event); | |
1662 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1663 | } |
1664 | __end_lock: | |
1665 | spin_unlock_irq(&ctl->read_lock); | |
1666 | __end: | |
1667 | return result > 0 ? result : err; | |
1668 | } | |
1669 | ||
680ef72a | 1670 | static __poll_t snd_ctl_poll(struct file *file, poll_table * wait) |
1da177e4 | 1671 | { |
680ef72a | 1672 | __poll_t mask; |
82e9bae6 | 1673 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1674 | |
1675 | ctl = file->private_data; | |
1676 | if (!ctl->subscribed) | |
1677 | return 0; | |
1678 | poll_wait(file, &ctl->change_sleep, wait); | |
1679 | ||
1680 | mask = 0; | |
1681 | if (!list_empty(&ctl->events)) | |
a9a08845 | 1682 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
1683 | |
1684 | return mask; | |
1685 | } | |
1686 | ||
1687 | /* | |
1688 | * register the device-specific control-ioctls. | |
1689 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1690 | */ | |
1691 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1692 | { | |
82e9bae6 | 1693 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1694 | |
82e9bae6 | 1695 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1696 | if (pn == NULL) |
1697 | return -ENOMEM; | |
1698 | pn->fioctl = fcn; | |
1699 | down_write(&snd_ioctl_rwsem); | |
1700 | list_add_tail(&pn->list, lists); | |
1701 | up_write(&snd_ioctl_rwsem); | |
1702 | return 0; | |
1703 | } | |
1704 | ||
12cddbd8 TI |
1705 | /** |
1706 | * snd_ctl_register_ioctl - register the device-specific control-ioctls | |
1707 | * @fcn: ioctl callback function | |
1708 | * | |
1709 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1710 | */ | |
1da177e4 LT |
1711 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) |
1712 | { | |
1713 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1714 | } | |
c0d3fb39 TI |
1715 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1716 | ||
1da177e4 | 1717 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1718 | /** |
1719 | * snd_ctl_register_ioctl_compat - register the device-specific 32bit compat | |
1720 | * control-ioctls | |
1721 | * @fcn: ioctl callback function | |
1722 | */ | |
1da177e4 LT |
1723 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1724 | { | |
1725 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1726 | } | |
c0d3fb39 | 1727 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); |
1da177e4 LT |
1728 | #endif |
1729 | ||
1730 | /* | |
1731 | * de-register the device-specific control-ioctls. | |
1732 | */ | |
82e9bae6 TI |
1733 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1734 | struct list_head *lists) | |
1da177e4 | 1735 | { |
82e9bae6 | 1736 | struct snd_kctl_ioctl *p; |
1da177e4 | 1737 | |
7eaa943c TI |
1738 | if (snd_BUG_ON(!fcn)) |
1739 | return -EINVAL; | |
1da177e4 | 1740 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1741 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1742 | if (p->fioctl == fcn) { |
1743 | list_del(&p->list); | |
1744 | up_write(&snd_ioctl_rwsem); | |
1745 | kfree(p); | |
1746 | return 0; | |
1747 | } | |
1748 | } | |
1749 | up_write(&snd_ioctl_rwsem); | |
1750 | snd_BUG(); | |
1751 | return -EINVAL; | |
1752 | } | |
1753 | ||
12cddbd8 TI |
1754 | /** |
1755 | * snd_ctl_unregister_ioctl - de-register the device-specific control-ioctls | |
1756 | * @fcn: ioctl callback function to unregister | |
1757 | */ | |
1da177e4 LT |
1758 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) |
1759 | { | |
1760 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1761 | } | |
c0d3fb39 TI |
1762 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1763 | ||
1da177e4 | 1764 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1765 | /** |
1766 | * snd_ctl_unregister_ioctl - de-register the device-specific compat 32bit | |
1767 | * control-ioctls | |
1768 | * @fcn: ioctl callback function to unregister | |
1769 | */ | |
1da177e4 LT |
1770 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1771 | { | |
1772 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1773 | } | |
c0d3fb39 | 1774 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1775 | #endif |
1776 | ||
1777 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1778 | { | |
82e9bae6 | 1779 | struct snd_ctl_file *ctl; |
60aa4924 | 1780 | |
1da177e4 | 1781 | ctl = file->private_data; |
60aa4924 | 1782 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1783 | } |
1784 | ||
23c18d4b TI |
1785 | /* return the preferred subdevice number if already assigned; |
1786 | * otherwise return -1 | |
1787 | */ | |
1788 | int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type) | |
1789 | { | |
1790 | struct snd_ctl_file *kctl; | |
1791 | int subdevice = -1; | |
1792 | ||
1793 | read_lock(&card->ctl_files_rwlock); | |
1794 | list_for_each_entry(kctl, &card->ctl_files, list) { | |
1795 | if (kctl->pid == task_pid(current)) { | |
1796 | subdevice = kctl->preferred_subdevice[type]; | |
1797 | if (subdevice != -1) | |
1798 | break; | |
1799 | } | |
1800 | } | |
1801 | read_unlock(&card->ctl_files_rwlock); | |
1802 | return subdevice; | |
1803 | } | |
1804 | EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice); | |
1805 | ||
1da177e4 LT |
1806 | /* |
1807 | * ioctl32 compat | |
1808 | */ | |
1809 | #ifdef CONFIG_COMPAT | |
1810 | #include "control_compat.c" | |
1811 | #else | |
1812 | #define snd_ctl_ioctl_compat NULL | |
1813 | #endif | |
1814 | ||
1815 | /* | |
1816 | * INIT PART | |
1817 | */ | |
1818 | ||
9c2e08c5 | 1819 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1820 | { |
1821 | .owner = THIS_MODULE, | |
1822 | .read = snd_ctl_read, | |
1823 | .open = snd_ctl_open, | |
1824 | .release = snd_ctl_release, | |
02f4865f | 1825 | .llseek = no_llseek, |
1da177e4 LT |
1826 | .poll = snd_ctl_poll, |
1827 | .unlocked_ioctl = snd_ctl_ioctl, | |
1828 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1829 | .fasync = snd_ctl_fasync, | |
1830 | }; | |
1831 | ||
1da177e4 LT |
1832 | /* |
1833 | * registration of the control device | |
1834 | */ | |
82e9bae6 | 1835 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1836 | { |
82e9bae6 | 1837 | struct snd_card *card = device->device_data; |
1da177e4 | 1838 | |
40a4b263 TI |
1839 | return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1840 | &snd_ctl_f_ops, card, &card->ctl_dev); | |
1da177e4 LT |
1841 | } |
1842 | ||
1843 | /* | |
1844 | * disconnection of the control device | |
1845 | */ | |
82e9bae6 | 1846 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1847 | { |
82e9bae6 | 1848 | struct snd_card *card = device->device_data; |
82e9bae6 | 1849 | struct snd_ctl_file *ctl; |
1da177e4 | 1850 | |
d8009882 | 1851 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1852 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1853 | wake_up(&ctl->change_sleep); |
1854 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1855 | } | |
d8009882 | 1856 | read_unlock(&card->ctl_files_rwlock); |
c461482c | 1857 | |
40a4b263 | 1858 | return snd_unregister_device(&card->ctl_dev); |
1da177e4 LT |
1859 | } |
1860 | ||
1861 | /* | |
1862 | * free all controls | |
1863 | */ | |
82e9bae6 | 1864 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1865 | { |
82e9bae6 TI |
1866 | struct snd_card *card = device->device_data; |
1867 | struct snd_kcontrol *control; | |
1da177e4 LT |
1868 | |
1869 | down_write(&card->controls_rwsem); | |
1870 | while (!list_empty(&card->controls)) { | |
1871 | control = snd_kcontrol(card->controls.next); | |
1872 | snd_ctl_remove(card, control); | |
1873 | } | |
1874 | up_write(&card->controls_rwsem); | |
0fcd9f4b | 1875 | put_device(&card->ctl_dev); |
1da177e4 LT |
1876 | return 0; |
1877 | } | |
1878 | ||
1da177e4 LT |
1879 | /* |
1880 | * create control core: | |
1881 | * called from init.c | |
1882 | */ | |
82e9bae6 | 1883 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1884 | { |
82e9bae6 | 1885 | static struct snd_device_ops ops = { |
1da177e4 LT |
1886 | .dev_free = snd_ctl_dev_free, |
1887 | .dev_register = snd_ctl_dev_register, | |
1888 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 | 1889 | }; |
0fcd9f4b | 1890 | int err; |
1da177e4 | 1891 | |
7eaa943c TI |
1892 | if (snd_BUG_ON(!card)) |
1893 | return -ENXIO; | |
0fcd9f4b TI |
1894 | if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS)) |
1895 | return -ENXIO; | |
1896 | ||
1897 | snd_device_initialize(&card->ctl_dev, card); | |
1898 | dev_set_name(&card->ctl_dev, "controlC%d", card->number); | |
1899 | ||
1900 | err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1901 | if (err < 0) | |
1902 | put_device(&card->ctl_dev); | |
1903 | return err; | |
1da177e4 | 1904 | } |
b9ed4f2b TI |
1905 | |
1906 | /* | |
9600732b | 1907 | * Frequently used control callbacks/helpers |
b9ed4f2b | 1908 | */ |
12cddbd8 TI |
1909 | |
1910 | /** | |
1911 | * snd_ctl_boolean_mono_info - Helper function for a standard boolean info | |
1912 | * callback with a mono channel | |
1913 | * @kcontrol: the kcontrol instance | |
1914 | * @uinfo: info to store | |
1915 | * | |
1916 | * This is a function that can be used as info callback for a standard | |
1917 | * boolean control with a single mono channel. | |
1918 | */ | |
b9ed4f2b TI |
1919 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, |
1920 | struct snd_ctl_elem_info *uinfo) | |
1921 | { | |
1922 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1923 | uinfo->count = 1; | |
1924 | uinfo->value.integer.min = 0; | |
1925 | uinfo->value.integer.max = 1; | |
1926 | return 0; | |
1927 | } | |
b9ed4f2b TI |
1928 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); |
1929 | ||
12cddbd8 TI |
1930 | /** |
1931 | * snd_ctl_boolean_stereo_info - Helper function for a standard boolean info | |
1932 | * callback with stereo two channels | |
1933 | * @kcontrol: the kcontrol instance | |
1934 | * @uinfo: info to store | |
1935 | * | |
1936 | * This is a function that can be used as info callback for a standard | |
1937 | * boolean control with stereo two channels. | |
1938 | */ | |
b9ed4f2b TI |
1939 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, |
1940 | struct snd_ctl_elem_info *uinfo) | |
1941 | { | |
1942 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1943 | uinfo->count = 2; | |
1944 | uinfo->value.integer.min = 0; | |
1945 | uinfo->value.integer.max = 1; | |
1946 | return 0; | |
1947 | } | |
b9ed4f2b | 1948 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |
9600732b CL |
1949 | |
1950 | /** | |
1951 | * snd_ctl_enum_info - fills the info structure for an enumerated control | |
1952 | * @info: the structure to be filled | |
1953 | * @channels: the number of the control's channels; often one | |
1954 | * @items: the number of control values; also the size of @names | |
1955 | * @names: an array containing the names of all control values | |
1956 | * | |
1957 | * Sets all required fields in @info to their appropriate values. | |
1958 | * If the control's accessibility is not the default (readable and writable), | |
1959 | * the caller has to fill @info->access. | |
eb7c06e8 YB |
1960 | * |
1961 | * Return: Zero. | |
9600732b CL |
1962 | */ |
1963 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, | |
1964 | unsigned int items, const char *const names[]) | |
1965 | { | |
1966 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; | |
1967 | info->count = channels; | |
1968 | info->value.enumerated.items = items; | |
a7e6fb99 TI |
1969 | if (!items) |
1970 | return 0; | |
9600732b CL |
1971 | if (info->value.enumerated.item >= items) |
1972 | info->value.enumerated.item = items - 1; | |
df803e13 TI |
1973 | WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name), |
1974 | "ALSA: too long item name '%s'\n", | |
1975 | names[info->value.enumerated.item]); | |
9600732b CL |
1976 | strlcpy(info->value.enumerated.name, |
1977 | names[info->value.enumerated.item], | |
1978 | sizeof(info->value.enumerated.name)); | |
1979 | return 0; | |
1980 | } | |
1981 | EXPORT_SYMBOL(snd_ctl_enum_info); |