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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Routines for driver control interface | |
c1017a4c | 4 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
5 | */ |
6 | ||
1da177e4 LT |
7 | #include <linux/threads.h> |
8 | #include <linux/interrupt.h> | |
da155d5b | 9 | #include <linux/module.h> |
1da177e4 LT |
10 | #include <linux/slab.h> |
11 | #include <linux/vmalloc.h> | |
12 | #include <linux/time.h> | |
88a89037 | 13 | #include <linux/mm.h> |
174cd4b1 | 14 | #include <linux/sched/signal.h> |
1da177e4 LT |
15 | #include <sound/core.h> |
16 | #include <sound/minors.h> | |
17 | #include <sound/info.h> | |
18 | #include <sound/control.h> | |
19 | ||
20 | /* max number of user-defined controls */ | |
21 | #define MAX_USER_CONTROLS 32 | |
5591bf07 | 22 | #define MAX_CONTROL_COUNT 1028 |
1da177e4 | 23 | |
82e9bae6 | 24 | struct snd_kctl_ioctl { |
1da177e4 LT |
25 | struct list_head list; /* list of all ioctls */ |
26 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 27 | }; |
1da177e4 LT |
28 | |
29 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
30 | static LIST_HEAD(snd_control_ioctls); | |
31 | #ifdef CONFIG_COMPAT | |
32 | static LIST_HEAD(snd_control_compat_ioctls); | |
33 | #endif | |
34 | ||
35 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
36 | { | |
1da177e4 | 37 | unsigned long flags; |
82e9bae6 TI |
38 | struct snd_card *card; |
39 | struct snd_ctl_file *ctl; | |
23c18d4b | 40 | int i, err; |
1da177e4 | 41 | |
c5bf68fe | 42 | err = stream_open(inode, file); |
02f4865f TI |
43 | if (err < 0) |
44 | return err; | |
45 | ||
f87135f5 | 46 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
47 | if (!card) { |
48 | err = -ENODEV; | |
49 | goto __error1; | |
50 | } | |
51 | err = snd_card_file_add(card, file); | |
52 | if (err < 0) { | |
53 | err = -ENODEV; | |
54 | goto __error1; | |
55 | } | |
56 | if (!try_module_get(card->module)) { | |
57 | err = -EFAULT; | |
58 | goto __error2; | |
59 | } | |
ca2c0966 | 60 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
61 | if (ctl == NULL) { |
62 | err = -ENOMEM; | |
63 | goto __error; | |
64 | } | |
65 | INIT_LIST_HEAD(&ctl->events); | |
66 | init_waitqueue_head(&ctl->change_sleep); | |
67 | spin_lock_init(&ctl->read_lock); | |
68 | ctl->card = card; | |
23c18d4b TI |
69 | for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++) |
70 | ctl->preferred_subdevice[i] = -1; | |
25d27ede | 71 | ctl->pid = get_pid(task_pid(current)); |
1da177e4 LT |
72 | file->private_data = ctl; |
73 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
74 | list_add_tail(&ctl->list, &card->ctl_files); | |
75 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
a0830dbd | 76 | snd_card_unref(card); |
1da177e4 LT |
77 | return 0; |
78 | ||
79 | __error: | |
80 | module_put(card->module); | |
81 | __error2: | |
82 | snd_card_file_remove(card, file); | |
83 | __error1: | |
a0830dbd TI |
84 | if (card) |
85 | snd_card_unref(card); | |
1da177e4 LT |
86 | return err; |
87 | } | |
88 | ||
82e9bae6 | 89 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 90 | { |
7507e8da | 91 | unsigned long flags; |
82e9bae6 | 92 | struct snd_kctl_event *cread; |
dd5f313b | 93 | |
7507e8da | 94 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
95 | while (!list_empty(&ctl->events)) { |
96 | cread = snd_kctl_event(ctl->events.next); | |
97 | list_del(&cread->list); | |
98 | kfree(cread); | |
99 | } | |
7507e8da | 100 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
101 | } |
102 | ||
103 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
104 | { | |
105 | unsigned long flags; | |
82e9bae6 TI |
106 | struct snd_card *card; |
107 | struct snd_ctl_file *ctl; | |
108 | struct snd_kcontrol *control; | |
1da177e4 LT |
109 | unsigned int idx; |
110 | ||
111 | ctl = file->private_data; | |
1da177e4 LT |
112 | file->private_data = NULL; |
113 | card = ctl->card; | |
114 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
115 | list_del(&ctl->list); | |
116 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
117 | down_write(&card->controls_rwsem); | |
9244b2c3 | 118 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
119 | for (idx = 0; idx < control->count; idx++) |
120 | if (control->vd[idx].owner == ctl) | |
121 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
122 | up_write(&card->controls_rwsem); |
123 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 124 | put_pid(ctl->pid); |
1da177e4 LT |
125 | kfree(ctl); |
126 | module_put(card->module); | |
127 | snd_card_file_remove(card, file); | |
128 | return 0; | |
129 | } | |
130 | ||
12cddbd8 TI |
131 | /** |
132 | * snd_ctl_notify - Send notification to user-space for a control change | |
133 | * @card: the card to send notification | |
134 | * @mask: the event mask, SNDRV_CTL_EVENT_* | |
135 | * @id: the ctl element id to send notification | |
136 | * | |
137 | * This function adds an event record with the given id and mask, appends | |
138 | * to the list and wakes up the user-space for notification. This can be | |
139 | * called in the atomic context. | |
140 | */ | |
82e9bae6 TI |
141 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
142 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
143 | { |
144 | unsigned long flags; | |
82e9bae6 TI |
145 | struct snd_ctl_file *ctl; |
146 | struct snd_kctl_event *ev; | |
dd5f313b | 147 | |
7eaa943c TI |
148 | if (snd_BUG_ON(!card || !id)) |
149 | return; | |
f388cdcd TI |
150 | if (card->shutdown) |
151 | return; | |
1da177e4 | 152 | read_lock(&card->ctl_files_rwlock); |
8eeaa2f9 | 153 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
154 | card->mixer_oss_change_count++; |
155 | #endif | |
9244b2c3 | 156 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
157 | if (!ctl->subscribed) |
158 | continue; | |
159 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 160 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
161 | if (ev->id.numid == id->numid) { |
162 | ev->mask |= mask; | |
163 | goto _found; | |
164 | } | |
165 | } | |
ca2c0966 | 166 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
167 | if (ev) { |
168 | ev->id = *id; | |
169 | ev->mask = mask; | |
170 | list_add_tail(&ev->list, &ctl->events); | |
171 | } else { | |
bb009457 | 172 | dev_err(card->dev, "No memory available to allocate event\n"); |
1da177e4 LT |
173 | } |
174 | _found: | |
175 | wake_up(&ctl->change_sleep); | |
176 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
177 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
178 | } | |
179 | read_unlock(&card->ctl_files_rwlock); | |
180 | } | |
c0d3fb39 TI |
181 | EXPORT_SYMBOL(snd_ctl_notify); |
182 | ||
1da177e4 | 183 | /** |
2225e79b TS |
184 | * snd_ctl_new - create a new control instance with some elements |
185 | * @kctl: the pointer to store new control instance | |
186 | * @count: the number of elements in this control | |
187 | * @access: the default access flags for elements in this control | |
188 | * @file: given when locking these elements | |
1da177e4 | 189 | * |
2225e79b TS |
190 | * Allocates a memory object for a new control instance. The instance has |
191 | * elements as many as the given number (@count). Each element has given | |
192 | * access permissions (@access). Each element is locked when @file is given. | |
1da177e4 | 193 | * |
2225e79b | 194 | * Return: 0 on success, error code on failure |
1da177e4 | 195 | */ |
2225e79b TS |
196 | static int snd_ctl_new(struct snd_kcontrol **kctl, unsigned int count, |
197 | unsigned int access, struct snd_ctl_file *file) | |
1da177e4 | 198 | { |
1da177e4 | 199 | unsigned int idx; |
dd5f313b | 200 | |
2225e79b TS |
201 | if (count == 0 || count > MAX_CONTROL_COUNT) |
202 | return -EINVAL; | |
5591bf07 | 203 | |
65be9580 | 204 | *kctl = kzalloc(struct_size(*kctl, vd, count), GFP_KERNEL); |
ec0e9937 | 205 | if (!*kctl) |
2225e79b | 206 | return -ENOMEM; |
2225e79b TS |
207 | |
208 | for (idx = 0; idx < count; idx++) { | |
209 | (*kctl)->vd[idx].access = access; | |
210 | (*kctl)->vd[idx].owner = file; | |
211 | } | |
212 | (*kctl)->count = count; | |
213 | ||
214 | return 0; | |
1da177e4 LT |
215 | } |
216 | ||
217 | /** | |
218 | * snd_ctl_new1 - create a control instance from the template | |
219 | * @ncontrol: the initialization record | |
220 | * @private_data: the private data to set | |
221 | * | |
dd5f313b | 222 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
223 | * template. When the access field of ncontrol is 0, it's assumed as |
224 | * READWRITE access. When the count field is 0, it's assumes as one. | |
225 | * | |
eb7c06e8 | 226 | * Return: The pointer of the newly generated instance, or %NULL on failure. |
1da177e4 | 227 | */ |
82e9bae6 TI |
228 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
229 | void *private_data) | |
1da177e4 | 230 | { |
2225e79b TS |
231 | struct snd_kcontrol *kctl; |
232 | unsigned int count; | |
1da177e4 | 233 | unsigned int access; |
2225e79b | 234 | int err; |
dd5f313b | 235 | |
7eaa943c TI |
236 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
237 | return NULL; | |
2225e79b TS |
238 | |
239 | count = ncontrol->count; | |
240 | if (count == 0) | |
241 | count = 1; | |
242 | ||
243 | access = ncontrol->access; | |
244 | if (access == 0) | |
245 | access = SNDRV_CTL_ELEM_ACCESS_READWRITE; | |
246 | access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | | |
247 | SNDRV_CTL_ELEM_ACCESS_VOLATILE | | |
248 | SNDRV_CTL_ELEM_ACCESS_INACTIVE | | |
249 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE | | |
250 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND | | |
251 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK); | |
252 | ||
253 | err = snd_ctl_new(&kctl, count, access, NULL); | |
254 | if (err < 0) | |
255 | return NULL; | |
256 | ||
257 | /* The 'numid' member is decided when calling snd_ctl_add(). */ | |
258 | kctl->id.iface = ncontrol->iface; | |
259 | kctl->id.device = ncontrol->device; | |
260 | kctl->id.subdevice = ncontrol->subdevice; | |
366840d7 | 261 | if (ncontrol->name) { |
2225e79b TS |
262 | strlcpy(kctl->id.name, ncontrol->name, sizeof(kctl->id.name)); |
263 | if (strcmp(ncontrol->name, kctl->id.name) != 0) | |
bb009457 | 264 | pr_warn("ALSA: Control name '%s' truncated to '%s'\n", |
2225e79b | 265 | ncontrol->name, kctl->id.name); |
366840d7 | 266 | } |
2225e79b TS |
267 | kctl->id.index = ncontrol->index; |
268 | ||
269 | kctl->info = ncontrol->info; | |
270 | kctl->get = ncontrol->get; | |
271 | kctl->put = ncontrol->put; | |
272 | kctl->tlv.p = ncontrol->tlv.p; | |
273 | ||
274 | kctl->private_value = ncontrol->private_value; | |
275 | kctl->private_data = private_data; | |
276 | ||
277 | return kctl; | |
1da177e4 | 278 | } |
c0d3fb39 TI |
279 | EXPORT_SYMBOL(snd_ctl_new1); |
280 | ||
1da177e4 LT |
281 | /** |
282 | * snd_ctl_free_one - release the control instance | |
283 | * @kcontrol: the control instance | |
284 | * | |
285 | * Releases the control instance created via snd_ctl_new() | |
286 | * or snd_ctl_new1(). | |
287 | * Don't call this after the control was added to the card. | |
288 | */ | |
82e9bae6 | 289 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
290 | { |
291 | if (kcontrol) { | |
292 | if (kcontrol->private_free) | |
293 | kcontrol->private_free(kcontrol); | |
294 | kfree(kcontrol); | |
295 | } | |
296 | } | |
c0d3fb39 TI |
297 | EXPORT_SYMBOL(snd_ctl_free_one); |
298 | ||
0e82e5fa CL |
299 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
300 | unsigned int count) | |
1da177e4 | 301 | { |
82e9bae6 | 302 | struct snd_kcontrol *kctl; |
1da177e4 | 303 | |
ac902c11 LPC |
304 | /* Make sure that the ids assigned to the control do not wrap around */ |
305 | if (card->last_numid >= UINT_MAX - count) | |
306 | card->last_numid = 0; | |
307 | ||
9244b2c3 | 308 | list_for_each_entry(kctl, &card->controls, list) { |
7c733587 | 309 | if (kctl->id.numid < card->last_numid + 1 + count && |
0e82e5fa CL |
310 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
311 | card->last_numid = kctl->id.numid + kctl->count - 1; | |
312 | return true; | |
313 | } | |
1da177e4 | 314 | } |
0e82e5fa | 315 | return false; |
1da177e4 LT |
316 | } |
317 | ||
82e9bae6 | 318 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 | 319 | { |
0e82e5fa | 320 | unsigned int iter = 100000; |
1da177e4 | 321 | |
0e82e5fa | 322 | while (snd_ctl_remove_numid_conflict(card, count)) { |
1da177e4 LT |
323 | if (--iter == 0) { |
324 | /* this situation is very unlikely */ | |
bb009457 | 325 | dev_err(card->dev, "unable to allocate new control numid\n"); |
1da177e4 LT |
326 | return -ENOMEM; |
327 | } | |
1da177e4 LT |
328 | } |
329 | return 0; | |
330 | } | |
331 | ||
3103c08f TI |
332 | enum snd_ctl_add_mode { |
333 | CTL_ADD_EXCLUSIVE, CTL_REPLACE, CTL_ADD_ON_REPLACE, | |
334 | }; | |
335 | ||
336 | /* add/replace a new kcontrol object; call with card->controls_rwsem locked */ | |
337 | static int __snd_ctl_add_replace(struct snd_card *card, | |
338 | struct snd_kcontrol *kcontrol, | |
339 | enum snd_ctl_add_mode mode) | |
e1a7bfe3 TI |
340 | { |
341 | struct snd_ctl_elem_id id; | |
342 | unsigned int idx; | |
343 | unsigned int count; | |
3103c08f TI |
344 | struct snd_kcontrol *old; |
345 | int err; | |
e1a7bfe3 TI |
346 | |
347 | id = kcontrol->id; | |
348 | if (id.index > UINT_MAX - kcontrol->count) | |
349 | return -EINVAL; | |
350 | ||
3103c08f TI |
351 | old = snd_ctl_find_id(card, &id); |
352 | if (!old) { | |
353 | if (mode == CTL_REPLACE) | |
354 | return -EINVAL; | |
355 | } else { | |
356 | if (mode == CTL_ADD_EXCLUSIVE) { | |
357 | dev_err(card->dev, | |
358 | "control %i:%i:%i:%s:%i is already present\n", | |
359 | id.iface, id.device, id.subdevice, id.name, | |
360 | id.index); | |
361 | return -EBUSY; | |
362 | } | |
363 | ||
364 | err = snd_ctl_remove(card, old); | |
365 | if (err < 0) | |
366 | return err; | |
e1a7bfe3 TI |
367 | } |
368 | ||
369 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) | |
370 | return -ENOMEM; | |
371 | ||
372 | list_add_tail(&kcontrol->list, &card->controls); | |
373 | card->controls_count += kcontrol->count; | |
374 | kcontrol->id.numid = card->last_numid + 1; | |
375 | card->last_numid += kcontrol->count; | |
376 | ||
377 | id = kcontrol->id; | |
378 | count = kcontrol->count; | |
379 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) | |
380 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
3103c08f TI |
385 | static int snd_ctl_add_replace(struct snd_card *card, |
386 | struct snd_kcontrol *kcontrol, | |
387 | enum snd_ctl_add_mode mode) | |
1da177e4 | 388 | { |
c6077b30 | 389 | int err = -EINVAL; |
1da177e4 | 390 | |
73e77ba0 | 391 | if (! kcontrol) |
c6077b30 | 392 | return err; |
7eaa943c TI |
393 | if (snd_BUG_ON(!card || !kcontrol->info)) |
394 | goto error; | |
883a1d49 | 395 | |
1da177e4 | 396 | down_write(&card->controls_rwsem); |
3103c08f | 397 | err = __snd_ctl_add_replace(card, kcontrol, mode); |
1da177e4 | 398 | up_write(&card->controls_rwsem); |
e1a7bfe3 TI |
399 | if (err < 0) |
400 | goto error; | |
1da177e4 | 401 | return 0; |
c6077b30 TI |
402 | |
403 | error: | |
404 | snd_ctl_free_one(kcontrol); | |
405 | return err; | |
1da177e4 | 406 | } |
3103c08f TI |
407 | |
408 | /** | |
409 | * snd_ctl_add - add the control instance to the card | |
410 | * @card: the card instance | |
411 | * @kcontrol: the control instance to add | |
412 | * | |
413 | * Adds the control instance created via snd_ctl_new() or | |
414 | * snd_ctl_new1() to the given card. Assigns also an unique | |
415 | * numid used for fast search. | |
416 | * | |
417 | * It frees automatically the control which cannot be added. | |
418 | * | |
419 | * Return: Zero if successful, or a negative error code on failure. | |
420 | * | |
421 | */ | |
422 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) | |
423 | { | |
424 | return snd_ctl_add_replace(card, kcontrol, CTL_ADD_EXCLUSIVE); | |
425 | } | |
c0d3fb39 TI |
426 | EXPORT_SYMBOL(snd_ctl_add); |
427 | ||
66b5b972 DP |
428 | /** |
429 | * snd_ctl_replace - replace the control instance of the card | |
430 | * @card: the card instance | |
431 | * @kcontrol: the control instance to replace | |
432 | * @add_on_replace: add the control if not already added | |
433 | * | |
434 | * Replaces the given control. If the given control does not exist | |
435 | * and the add_on_replace flag is set, the control is added. If the | |
436 | * control exists, it is destroyed first. | |
437 | * | |
66b5b972 | 438 | * It frees automatically the control which cannot be added or replaced. |
eb7c06e8 YB |
439 | * |
440 | * Return: Zero if successful, or a negative error code on failure. | |
66b5b972 DP |
441 | */ |
442 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, | |
443 | bool add_on_replace) | |
444 | { | |
3103c08f TI |
445 | return snd_ctl_add_replace(card, kcontrol, |
446 | add_on_replace ? CTL_ADD_ON_REPLACE : CTL_REPLACE); | |
66b5b972 DP |
447 | } |
448 | EXPORT_SYMBOL(snd_ctl_replace); | |
449 | ||
1da177e4 LT |
450 | /** |
451 | * snd_ctl_remove - remove the control from the card and release it | |
452 | * @card: the card instance | |
453 | * @kcontrol: the control instance to remove | |
454 | * | |
455 | * Removes the control from the card and then releases the instance. | |
456 | * You don't need to call snd_ctl_free_one(). You must be in | |
457 | * the write lock - down_write(&card->controls_rwsem). | |
eb7c06e8 YB |
458 | * |
459 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 460 | */ |
82e9bae6 | 461 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 462 | { |
82e9bae6 | 463 | struct snd_ctl_elem_id id; |
1da177e4 LT |
464 | unsigned int idx; |
465 | ||
7eaa943c TI |
466 | if (snd_BUG_ON(!card || !kcontrol)) |
467 | return -EINVAL; | |
1da177e4 LT |
468 | list_del(&kcontrol->list); |
469 | card->controls_count -= kcontrol->count; | |
470 | id = kcontrol->id; | |
471 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
472 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
473 | snd_ctl_free_one(kcontrol); | |
474 | return 0; | |
475 | } | |
c0d3fb39 TI |
476 | EXPORT_SYMBOL(snd_ctl_remove); |
477 | ||
1da177e4 LT |
478 | /** |
479 | * snd_ctl_remove_id - remove the control of the given id and release it | |
480 | * @card: the card instance | |
481 | * @id: the control id to remove | |
482 | * | |
483 | * Finds the control instance with the given id, removes it from the | |
484 | * card list and releases it. | |
eb7c06e8 YB |
485 | * |
486 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 487 | */ |
82e9bae6 | 488 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 489 | { |
82e9bae6 | 490 | struct snd_kcontrol *kctl; |
1da177e4 LT |
491 | int ret; |
492 | ||
493 | down_write(&card->controls_rwsem); | |
494 | kctl = snd_ctl_find_id(card, id); | |
495 | if (kctl == NULL) { | |
496 | up_write(&card->controls_rwsem); | |
497 | return -ENOENT; | |
498 | } | |
499 | ret = snd_ctl_remove(card, kctl); | |
500 | up_write(&card->controls_rwsem); | |
501 | return ret; | |
502 | } | |
c0d3fb39 TI |
503 | EXPORT_SYMBOL(snd_ctl_remove_id); |
504 | ||
1da177e4 | 505 | /** |
f217ac59 | 506 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
507 | * @file: active control handle |
508 | * @id: the control id to remove | |
509 | * | |
510 | * Finds the control instance with the given id, removes it from the | |
511 | * card list and releases it. | |
eb7c06e8 YB |
512 | * |
513 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 514 | */ |
f217ac59 CL |
515 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
516 | struct snd_ctl_elem_id *id) | |
1da177e4 | 517 | { |
82e9bae6 TI |
518 | struct snd_card *card = file->card; |
519 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
520 | int idx, ret; |
521 | ||
522 | down_write(&card->controls_rwsem); | |
523 | kctl = snd_ctl_find_id(card, id); | |
524 | if (kctl == NULL) { | |
317b8081 CL |
525 | ret = -ENOENT; |
526 | goto error; | |
1da177e4 | 527 | } |
18dd0aa5 CL |
528 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
529 | ret = -EINVAL; | |
530 | goto error; | |
531 | } | |
1da177e4 LT |
532 | for (idx = 0; idx < kctl->count; idx++) |
533 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
534 | ret = -EBUSY; |
535 | goto error; | |
1da177e4 LT |
536 | } |
537 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
538 | if (ret < 0) |
539 | goto error; | |
540 | card->user_ctl_count--; | |
317b8081 | 541 | error: |
1da177e4 LT |
542 | up_write(&card->controls_rwsem); |
543 | return ret; | |
544 | } | |
545 | ||
3cbdd753 TI |
546 | /** |
547 | * snd_ctl_activate_id - activate/inactivate the control of the given id | |
548 | * @card: the card instance | |
549 | * @id: the control id to activate/inactivate | |
550 | * @active: non-zero to activate | |
551 | * | |
552 | * Finds the control instance with the given id, and activate or | |
553 | * inactivate the control together with notification, if changed. | |
c78497e0 | 554 | * The given ID data is filled with full information. |
3cbdd753 | 555 | * |
eb7c06e8 | 556 | * Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
3cbdd753 TI |
557 | */ |
558 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, | |
559 | int active) | |
560 | { | |
561 | struct snd_kcontrol *kctl; | |
562 | struct snd_kcontrol_volatile *vd; | |
563 | unsigned int index_offset; | |
564 | int ret; | |
565 | ||
566 | down_write(&card->controls_rwsem); | |
567 | kctl = snd_ctl_find_id(card, id); | |
568 | if (kctl == NULL) { | |
569 | ret = -ENOENT; | |
570 | goto unlock; | |
571 | } | |
31584ed1 | 572 | index_offset = snd_ctl_get_ioff(kctl, id); |
3cbdd753 TI |
573 | vd = &kctl->vd[index_offset]; |
574 | ret = 0; | |
575 | if (active) { | |
576 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) | |
577 | goto unlock; | |
578 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
579 | } else { | |
580 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) | |
581 | goto unlock; | |
582 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
583 | } | |
c78497e0 | 584 | snd_ctl_build_ioff(id, kctl, index_offset); |
3cbdd753 TI |
585 | ret = 1; |
586 | unlock: | |
587 | up_write(&card->controls_rwsem); | |
588 | if (ret > 0) | |
589 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); | |
590 | return ret; | |
591 | } | |
592 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); | |
593 | ||
1da177e4 LT |
594 | /** |
595 | * snd_ctl_rename_id - replace the id of a control on the card | |
596 | * @card: the card instance | |
597 | * @src_id: the old id | |
598 | * @dst_id: the new id | |
599 | * | |
600 | * Finds the control with the old id from the card, and replaces the | |
601 | * id with the new one. | |
602 | * | |
eb7c06e8 | 603 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 604 | */ |
82e9bae6 TI |
605 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
606 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 607 | { |
82e9bae6 | 608 | struct snd_kcontrol *kctl; |
1da177e4 LT |
609 | |
610 | down_write(&card->controls_rwsem); | |
611 | kctl = snd_ctl_find_id(card, src_id); | |
612 | if (kctl == NULL) { | |
613 | up_write(&card->controls_rwsem); | |
614 | return -ENOENT; | |
615 | } | |
616 | kctl->id = *dst_id; | |
617 | kctl->id.numid = card->last_numid + 1; | |
618 | card->last_numid += kctl->count; | |
619 | up_write(&card->controls_rwsem); | |
620 | return 0; | |
621 | } | |
c0d3fb39 TI |
622 | EXPORT_SYMBOL(snd_ctl_rename_id); |
623 | ||
1da177e4 LT |
624 | /** |
625 | * snd_ctl_find_numid - find the control instance with the given number-id | |
626 | * @card: the card instance | |
627 | * @numid: the number-id to search | |
628 | * | |
629 | * Finds the control instance with the given number-id from the card. | |
630 | * | |
1da177e4 LT |
631 | * The caller must down card->controls_rwsem before calling this function |
632 | * (if the race condition can happen). | |
eb7c06e8 YB |
633 | * |
634 | * Return: The pointer of the instance if found, or %NULL if not. | |
635 | * | |
1da177e4 | 636 | */ |
82e9bae6 | 637 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 638 | { |
82e9bae6 | 639 | struct snd_kcontrol *kctl; |
1da177e4 | 640 | |
7eaa943c TI |
641 | if (snd_BUG_ON(!card || !numid)) |
642 | return NULL; | |
9244b2c3 | 643 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
644 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
645 | return kctl; | |
646 | } | |
647 | return NULL; | |
648 | } | |
c0d3fb39 TI |
649 | EXPORT_SYMBOL(snd_ctl_find_numid); |
650 | ||
1da177e4 LT |
651 | /** |
652 | * snd_ctl_find_id - find the control instance with the given id | |
653 | * @card: the card instance | |
654 | * @id: the id to search | |
655 | * | |
656 | * Finds the control instance with the given id from the card. | |
657 | * | |
1da177e4 LT |
658 | * The caller must down card->controls_rwsem before calling this function |
659 | * (if the race condition can happen). | |
eb7c06e8 YB |
660 | * |
661 | * Return: The pointer of the instance if found, or %NULL if not. | |
662 | * | |
1da177e4 | 663 | */ |
82e9bae6 TI |
664 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
665 | struct snd_ctl_elem_id *id) | |
1da177e4 | 666 | { |
82e9bae6 | 667 | struct snd_kcontrol *kctl; |
1da177e4 | 668 | |
7eaa943c TI |
669 | if (snd_BUG_ON(!card || !id)) |
670 | return NULL; | |
1da177e4 LT |
671 | if (id->numid != 0) |
672 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 673 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
674 | if (kctl->id.iface != id->iface) |
675 | continue; | |
676 | if (kctl->id.device != id->device) | |
677 | continue; | |
678 | if (kctl->id.subdevice != id->subdevice) | |
679 | continue; | |
680 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
681 | continue; | |
682 | if (kctl->id.index > id->index) | |
683 | continue; | |
684 | if (kctl->id.index + kctl->count <= id->index) | |
685 | continue; | |
686 | return kctl; | |
687 | } | |
688 | return NULL; | |
689 | } | |
c0d3fb39 TI |
690 | EXPORT_SYMBOL(snd_ctl_find_id); |
691 | ||
82e9bae6 | 692 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
693 | unsigned int cmd, void __user *arg) |
694 | { | |
82e9bae6 | 695 | struct snd_ctl_card_info *info; |
1da177e4 | 696 | |
ca2c0966 | 697 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
698 | if (! info) |
699 | return -ENOMEM; | |
700 | down_read(&snd_ioctl_rwsem); | |
701 | info->card = card->number; | |
702 | strlcpy(info->id, card->id, sizeof(info->id)); | |
703 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
704 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
705 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
706 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
707 | strlcpy(info->components, card->components, sizeof(info->components)); | |
708 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 709 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
710 | kfree(info); |
711 | return -EFAULT; | |
712 | } | |
713 | kfree(info); | |
714 | return 0; | |
715 | } | |
716 | ||
82e9bae6 TI |
717 | static int snd_ctl_elem_list(struct snd_card *card, |
718 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 | 719 | { |
82e9bae6 TI |
720 | struct snd_ctl_elem_list list; |
721 | struct snd_kcontrol *kctl; | |
53e7bf45 | 722 | struct snd_ctl_elem_id id; |
78fa2c4d | 723 | unsigned int offset, space, jidx; |
53e7bf45 | 724 | int err = 0; |
dd5f313b | 725 | |
1da177e4 LT |
726 | if (copy_from_user(&list, _list, sizeof(list))) |
727 | return -EFAULT; | |
728 | offset = list.offset; | |
729 | space = list.space; | |
4e361d3c | 730 | |
53e7bf45 TI |
731 | down_read(&card->controls_rwsem); |
732 | list.count = card->controls_count; | |
733 | list.used = 0; | |
1da177e4 | 734 | if (space > 0) { |
53e7bf45 TI |
735 | list_for_each_entry(kctl, &card->controls, list) { |
736 | if (offset >= kctl->count) { | |
737 | offset -= kctl->count; | |
738 | continue; | |
739 | } | |
740 | for (jidx = offset; jidx < kctl->count; jidx++) { | |
741 | snd_ctl_build_ioff(&id, kctl, jidx); | |
742 | if (copy_to_user(list.pids + list.used, &id, | |
743 | sizeof(id))) { | |
744 | err = -EFAULT; | |
745 | goto out; | |
746 | } | |
1da177e4 | 747 | list.used++; |
53e7bf45 TI |
748 | if (!--space) |
749 | goto out; | |
1da177e4 | 750 | } |
1da177e4 LT |
751 | offset = 0; |
752 | } | |
1da177e4 | 753 | } |
53e7bf45 TI |
754 | out: |
755 | up_read(&card->controls_rwsem); | |
756 | if (!err && copy_to_user(_list, &list, sizeof(list))) | |
757 | err = -EFAULT; | |
758 | return err; | |
1da177e4 LT |
759 | } |
760 | ||
82e9bae6 TI |
761 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
762 | struct snd_ctl_elem_info *info) | |
1da177e4 | 763 | { |
82e9bae6 TI |
764 | struct snd_card *card = ctl->card; |
765 | struct snd_kcontrol *kctl; | |
766 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
767 | unsigned int index_offset; |
768 | int result; | |
dd5f313b | 769 | |
1da177e4 LT |
770 | down_read(&card->controls_rwsem); |
771 | kctl = snd_ctl_find_id(card, &info->id); | |
772 | if (kctl == NULL) { | |
773 | up_read(&card->controls_rwsem); | |
774 | return -ENOENT; | |
775 | } | |
776 | #ifdef CONFIG_SND_DEBUG | |
777 | info->access = 0; | |
778 | #endif | |
779 | result = kctl->info(kctl, info); | |
780 | if (result >= 0) { | |
7eaa943c | 781 | snd_BUG_ON(info->access); |
1da177e4 LT |
782 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
783 | vd = &kctl->vd[index_offset]; | |
784 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
785 | info->access = vd->access; | |
786 | if (vd->owner) { | |
787 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
788 | if (vd->owner == ctl) | |
789 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 790 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
791 | } else { |
792 | info->owner = -1; | |
793 | } | |
794 | } | |
795 | up_read(&card->controls_rwsem); | |
796 | return result; | |
797 | } | |
798 | ||
82e9bae6 TI |
799 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
800 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 801 | { |
82e9bae6 | 802 | struct snd_ctl_elem_info info; |
1da177e4 LT |
803 | int result; |
804 | ||
805 | if (copy_from_user(&info, _info, sizeof(info))) | |
806 | return -EFAULT; | |
cbac4b0c | 807 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
808 | if (result < 0) |
809 | return result; | |
810 | result = snd_ctl_elem_info(ctl, &info); | |
811 | if (result < 0) | |
812 | return result; | |
813 | if (copy_to_user(_info, &info, sizeof(info))) | |
814 | return -EFAULT; | |
1da177e4 LT |
815 | return result; |
816 | } | |
817 | ||
d3bd67cd TI |
818 | static int snd_ctl_elem_read(struct snd_card *card, |
819 | struct snd_ctl_elem_value *control) | |
1da177e4 | 820 | { |
82e9bae6 TI |
821 | struct snd_kcontrol *kctl; |
822 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 823 | unsigned int index_offset; |
1da177e4 | 824 | |
1da177e4 | 825 | kctl = snd_ctl_find_id(card, &control->id); |
becf9e5d TS |
826 | if (kctl == NULL) |
827 | return -ENOENT; | |
828 | ||
829 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
830 | vd = &kctl->vd[index_offset]; | |
5a23699a | 831 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_READ) || kctl->get == NULL) |
becf9e5d TS |
832 | return -EPERM; |
833 | ||
834 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
835 | return kctl->get(kctl, control); | |
1da177e4 LT |
836 | } |
837 | ||
82e9bae6 TI |
838 | static int snd_ctl_elem_read_user(struct snd_card *card, |
839 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 840 | { |
82e9bae6 | 841 | struct snd_ctl_elem_value *control; |
1da177e4 | 842 | int result; |
ef44a1ec LZ |
843 | |
844 | control = memdup_user(_control, sizeof(*control)); | |
845 | if (IS_ERR(control)) | |
846 | return PTR_ERR(control); | |
847 | ||
cbac4b0c | 848 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
849 | if (result < 0) |
850 | goto error; | |
851 | ||
852 | down_read(&card->controls_rwsem); | |
853 | result = snd_ctl_elem_read(card, control); | |
854 | up_read(&card->controls_rwsem); | |
855 | if (result < 0) | |
856 | goto error; | |
857 | ||
858 | if (copy_to_user(_control, control, sizeof(*control))) | |
859 | result = -EFAULT; | |
860 | error: | |
1da177e4 LT |
861 | kfree(control); |
862 | return result; | |
863 | } | |
864 | ||
d3bd67cd TI |
865 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
866 | struct snd_ctl_elem_value *control) | |
1da177e4 | 867 | { |
82e9bae6 TI |
868 | struct snd_kcontrol *kctl; |
869 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 870 | unsigned int index_offset; |
8ace4f3c | 871 | int result; |
1da177e4 | 872 | |
1da177e4 | 873 | kctl = snd_ctl_find_id(card, &control->id); |
becf9e5d TS |
874 | if (kctl == NULL) |
875 | return -ENOENT; | |
876 | ||
877 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
878 | vd = &kctl->vd[index_offset]; | |
879 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || kctl->put == NULL || | |
880 | (file && vd->owner && vd->owner != file)) { | |
881 | return -EPERM; | |
1da177e4 | 882 | } |
becf9e5d TS |
883 | |
884 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
885 | result = kctl->put(kctl, control); | |
886 | if (result < 0) | |
887 | return result; | |
888 | ||
889 | if (result > 0) { | |
890 | struct snd_ctl_elem_id id = control->id; | |
891 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id); | |
892 | } | |
893 | ||
894 | return 0; | |
1da177e4 LT |
895 | } |
896 | ||
82e9bae6 TI |
897 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
898 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 899 | { |
82e9bae6 | 900 | struct snd_ctl_elem_value *control; |
64649400 | 901 | struct snd_card *card; |
1da177e4 LT |
902 | int result; |
903 | ||
ef44a1ec LZ |
904 | control = memdup_user(_control, sizeof(*control)); |
905 | if (IS_ERR(control)) | |
906 | return PTR_ERR(control); | |
907 | ||
64649400 | 908 | card = file->card; |
cbac4b0c | 909 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
910 | if (result < 0) |
911 | goto error; | |
912 | ||
913 | down_write(&card->controls_rwsem); | |
914 | result = snd_ctl_elem_write(card, file, control); | |
915 | up_write(&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 | ||
82e9bae6 TI |
926 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
927 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 928 | { |
82e9bae6 TI |
929 | struct snd_card *card = file->card; |
930 | struct snd_ctl_elem_id id; | |
931 | struct snd_kcontrol *kctl; | |
932 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 933 | int result; |
dd5f313b | 934 | |
1da177e4 LT |
935 | if (copy_from_user(&id, _id, sizeof(id))) |
936 | return -EFAULT; | |
937 | down_write(&card->controls_rwsem); | |
938 | kctl = snd_ctl_find_id(card, &id); | |
939 | if (kctl == NULL) { | |
940 | result = -ENOENT; | |
941 | } else { | |
942 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
943 | if (vd->owner != NULL) | |
944 | result = -EBUSY; | |
945 | else { | |
946 | vd->owner = file; | |
1da177e4 LT |
947 | result = 0; |
948 | } | |
949 | } | |
950 | up_write(&card->controls_rwsem); | |
951 | return result; | |
952 | } | |
953 | ||
82e9bae6 TI |
954 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
955 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 956 | { |
82e9bae6 TI |
957 | struct snd_card *card = file->card; |
958 | struct snd_ctl_elem_id id; | |
959 | struct snd_kcontrol *kctl; | |
960 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 961 | int result; |
dd5f313b | 962 | |
1da177e4 LT |
963 | if (copy_from_user(&id, _id, sizeof(id))) |
964 | return -EFAULT; | |
965 | down_write(&card->controls_rwsem); | |
966 | kctl = snd_ctl_find_id(card, &id); | |
967 | if (kctl == NULL) { | |
968 | result = -ENOENT; | |
969 | } else { | |
970 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
971 | if (vd->owner == NULL) | |
972 | result = -EINVAL; | |
973 | else if (vd->owner != file) | |
974 | result = -EPERM; | |
975 | else { | |
976 | vd->owner = NULL; | |
1da177e4 LT |
977 | result = 0; |
978 | } | |
979 | } | |
980 | up_write(&card->controls_rwsem); | |
981 | return result; | |
982 | } | |
983 | ||
984 | struct user_element { | |
82e9bae6 | 985 | struct snd_ctl_elem_info info; |
07f4d9d7 | 986 | struct snd_card *card; |
e1c78df1 | 987 | char *elem_data; /* element data */ |
1da177e4 | 988 | unsigned long elem_data_size; /* size of element data in bytes */ |
8aa9b586 JK |
989 | void *tlv_data; /* TLV data */ |
990 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 | 991 | void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4 LT |
992 | }; |
993 | ||
82e9bae6 TI |
994 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
995 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
996 | { |
997 | struct user_element *ue = kcontrol->private_data; | |
c378c3b0 | 998 | unsigned int offset; |
1da177e4 | 999 | |
c378c3b0 | 1000 | offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
1da177e4 | 1001 | *uinfo = ue->info; |
c378c3b0 TS |
1002 | snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
1003 | ||
1da177e4 LT |
1004 | return 0; |
1005 | } | |
1006 | ||
8d448162 CL |
1007 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
1008 | struct snd_ctl_elem_info *uinfo) | |
1009 | { | |
1010 | struct user_element *ue = kcontrol->private_data; | |
1011 | const char *names; | |
1012 | unsigned int item; | |
c378c3b0 | 1013 | unsigned int offset; |
8d448162 CL |
1014 | |
1015 | item = uinfo->value.enumerated.item; | |
1016 | ||
c378c3b0 | 1017 | offset = snd_ctl_get_ioff(kcontrol, &uinfo->id); |
8d448162 | 1018 | *uinfo = ue->info; |
c378c3b0 | 1019 | snd_ctl_build_ioff(&uinfo->id, kcontrol, offset); |
8d448162 CL |
1020 | |
1021 | item = min(item, uinfo->value.enumerated.items - 1); | |
1022 | uinfo->value.enumerated.item = item; | |
1023 | ||
1024 | names = ue->priv_data; | |
1025 | for (; item > 0; --item) | |
1026 | names += strlen(names) + 1; | |
1027 | strcpy(uinfo->value.enumerated.name, names); | |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | ||
82e9bae6 TI |
1032 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
1033 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1034 | { |
1035 | struct user_element *ue = kcontrol->private_data; | |
e1c78df1 TS |
1036 | unsigned int size = ue->elem_data_size; |
1037 | char *src = ue->elem_data + | |
1038 | snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; | |
1da177e4 | 1039 | |
e1c78df1 | 1040 | memcpy(&ucontrol->value, src, size); |
1da177e4 LT |
1041 | return 0; |
1042 | } | |
1043 | ||
82e9bae6 TI |
1044 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
1045 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1046 | { |
1047 | int change; | |
1048 | struct user_element *ue = kcontrol->private_data; | |
e1c78df1 TS |
1049 | unsigned int size = ue->elem_data_size; |
1050 | char *dst = ue->elem_data + | |
1051 | snd_ctl_get_ioff(kcontrol, &ucontrol->id) * size; | |
07f4d9d7 | 1052 | |
e1c78df1 | 1053 | change = memcmp(&ucontrol->value, dst, size) != 0; |
1da177e4 | 1054 | if (change) |
e1c78df1 | 1055 | memcpy(dst, &ucontrol->value, size); |
1da177e4 LT |
1056 | return change; |
1057 | } | |
1058 | ||
6d4d41f0 TS |
1059 | static int replace_user_tlv(struct snd_kcontrol *kctl, unsigned int __user *buf, |
1060 | unsigned int size) | |
8aa9b586 | 1061 | { |
6d4d41f0 TS |
1062 | struct user_element *ue = kctl->private_data; |
1063 | unsigned int *container; | |
da428828 | 1064 | struct snd_ctl_elem_id id; |
b8e2204b | 1065 | unsigned int mask = 0; |
da428828 | 1066 | int i; |
6d4d41f0 | 1067 | int change; |
8aa9b586 | 1068 | |
6d4d41f0 TS |
1069 | if (size > 1024 * 128) /* sane value */ |
1070 | return -EINVAL; | |
30d8340b | 1071 | |
88a89037 | 1072 | container = vmemdup_user(buf, size); |
6d4d41f0 TS |
1073 | if (IS_ERR(container)) |
1074 | return PTR_ERR(container); | |
ef44a1ec | 1075 | |
6d4d41f0 TS |
1076 | change = ue->tlv_data_size != size; |
1077 | if (!change) | |
241bc82e | 1078 | change = memcmp(ue->tlv_data, container, size) != 0; |
6d4d41f0 | 1079 | if (!change) { |
88a89037 | 1080 | kvfree(container); |
6d4d41f0 TS |
1081 | return 0; |
1082 | } | |
30d8340b | 1083 | |
b8e2204b TS |
1084 | if (ue->tlv_data == NULL) { |
1085 | /* Now TLV data is available. */ | |
1086 | for (i = 0; i < kctl->count; ++i) | |
1087 | kctl->vd[i].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ; | |
1088 | mask = SNDRV_CTL_EVENT_MASK_INFO; | |
1089 | } | |
1090 | ||
88a89037 | 1091 | kvfree(ue->tlv_data); |
6d4d41f0 TS |
1092 | ue->tlv_data = container; |
1093 | ue->tlv_data_size = size; | |
07f4d9d7 | 1094 | |
b8e2204b | 1095 | mask |= SNDRV_CTL_EVENT_MASK_TLV; |
da428828 TS |
1096 | for (i = 0; i < kctl->count; ++i) { |
1097 | snd_ctl_build_ioff(&id, kctl, i); | |
b8e2204b | 1098 | snd_ctl_notify(ue->card, mask, &id); |
da428828 | 1099 | } |
fb8027eb | 1100 | |
6d4d41f0 TS |
1101 | return change; |
1102 | } | |
30d8340b | 1103 | |
6d4d41f0 TS |
1104 | static int read_user_tlv(struct snd_kcontrol *kctl, unsigned int __user *buf, |
1105 | unsigned int size) | |
1106 | { | |
1107 | struct user_element *ue = kctl->private_data; | |
1108 | ||
1109 | if (ue->tlv_data_size == 0 || ue->tlv_data == NULL) | |
1110 | return -ENXIO; | |
1111 | ||
1112 | if (size < ue->tlv_data_size) | |
1113 | return -ENOSPC; | |
1114 | ||
1115 | if (copy_to_user(buf, ue->tlv_data, ue->tlv_data_size)) | |
1116 | return -EFAULT; | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kctl, int op_flag, | |
1122 | unsigned int size, unsigned int __user *buf) | |
1123 | { | |
1124 | if (op_flag == SNDRV_CTL_TLV_OP_WRITE) | |
1125 | return replace_user_tlv(kctl, buf, size); | |
1126 | else | |
1127 | return read_user_tlv(kctl, buf, size); | |
8aa9b586 JK |
1128 | } |
1129 | ||
8d448162 CL |
1130 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
1131 | { | |
1132 | char *names, *p; | |
1133 | size_t buf_len, name_len; | |
1134 | unsigned int i; | |
447c6f93 | 1135 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162 CL |
1136 | |
1137 | if (ue->info.value.enumerated.names_length > 64 * 1024) | |
1138 | return -EINVAL; | |
1139 | ||
59aeaf3f | 1140 | names = vmemdup_user((const void __user *)user_ptrval, |
8d448162 CL |
1141 | ue->info.value.enumerated.names_length); |
1142 | if (IS_ERR(names)) | |
1143 | return PTR_ERR(names); | |
1144 | ||
1145 | /* check that there are enough valid names */ | |
1146 | buf_len = ue->info.value.enumerated.names_length; | |
1147 | p = names; | |
1148 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { | |
1149 | name_len = strnlen(p, buf_len); | |
1150 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { | |
59aeaf3f | 1151 | kvfree(names); |
8d448162 CL |
1152 | return -EINVAL; |
1153 | } | |
1154 | p += name_len + 1; | |
1155 | buf_len -= name_len + 1; | |
1156 | } | |
1157 | ||
1158 | ue->priv_data = names; | |
1159 | ue->info.value.enumerated.names_ptr = 0; | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
82e9bae6 | 1164 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 1165 | { |
8aa9b586 | 1166 | struct user_element *ue = kcontrol->private_data; |
8d448162 | 1167 | |
88a89037 | 1168 | kvfree(ue->tlv_data); |
59aeaf3f | 1169 | kvfree(ue->priv_data); |
8aa9b586 | 1170 | kfree(ue); |
1da177e4 LT |
1171 | } |
1172 | ||
82e9bae6 TI |
1173 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
1174 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 1175 | { |
4ed56666 TS |
1176 | /* The capacity of struct snd_ctl_elem_value.value.*/ |
1177 | static const unsigned int value_sizes[] = { | |
1178 | [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = sizeof(long), | |
1179 | [SNDRV_CTL_ELEM_TYPE_INTEGER] = sizeof(long), | |
1180 | [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = sizeof(unsigned int), | |
1181 | [SNDRV_CTL_ELEM_TYPE_BYTES] = sizeof(unsigned char), | |
1182 | [SNDRV_CTL_ELEM_TYPE_IEC958] = sizeof(struct snd_aes_iec958), | |
1183 | [SNDRV_CTL_ELEM_TYPE_INTEGER64] = sizeof(long long), | |
1184 | }; | |
1185 | static const unsigned int max_value_counts[] = { | |
1186 | [SNDRV_CTL_ELEM_TYPE_BOOLEAN] = 128, | |
1187 | [SNDRV_CTL_ELEM_TYPE_INTEGER] = 128, | |
1188 | [SNDRV_CTL_ELEM_TYPE_ENUMERATED] = 128, | |
1189 | [SNDRV_CTL_ELEM_TYPE_BYTES] = 512, | |
1190 | [SNDRV_CTL_ELEM_TYPE_IEC958] = 1, | |
1191 | [SNDRV_CTL_ELEM_TYPE_INTEGER64] = 64, | |
1192 | }; | |
82e9bae6 | 1193 | struct snd_card *card = file->card; |
2225e79b TS |
1194 | struct snd_kcontrol *kctl; |
1195 | unsigned int count; | |
1da177e4 LT |
1196 | unsigned int access; |
1197 | long private_size; | |
1198 | struct user_element *ue; | |
cab2ed74 | 1199 | unsigned int offset; |
2225e79b | 1200 | int err; |
82262a46 | 1201 | |
be3bb823 TI |
1202 | if (!*info->id.name) |
1203 | return -EINVAL; | |
1204 | if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name)) | |
1205 | return -EINVAL; | |
82262a46 | 1206 | |
2225e79b | 1207 | /* Delete a control to replace them if needed. */ |
82262a46 | 1208 | if (replace) { |
2225e79b | 1209 | info->id.numid = 0; |
82262a46 LPC |
1210 | err = snd_ctl_remove_user_ctl(file, &info->id); |
1211 | if (err) | |
1212 | return err; | |
1da177e4 | 1213 | } |
82262a46 | 1214 | |
2225e79b TS |
1215 | /* |
1216 | * The number of userspace controls are counted control by control, | |
1217 | * not element by element. | |
1218 | */ | |
1219 | if (card->user_ctl_count + 1 > MAX_USER_CONTROLS) | |
82262a46 LPC |
1220 | return -ENOMEM; |
1221 | ||
2225e79b TS |
1222 | /* Check the number of elements for this userspace control. */ |
1223 | count = info->owner; | |
1224 | if (count == 0) | |
1225 | count = 1; | |
1226 | ||
1227 | /* Arrange access permissions if needed. */ | |
1228 | access = info->access; | |
1229 | if (access == 0) | |
1230 | access = SNDRV_CTL_ELEM_ACCESS_READWRITE; | |
1231 | access &= (SNDRV_CTL_ELEM_ACCESS_READWRITE | | |
1232 | SNDRV_CTL_ELEM_ACCESS_INACTIVE | | |
b8e2204b TS |
1233 | SNDRV_CTL_ELEM_ACCESS_TLV_WRITE); |
1234 | ||
1235 | /* In initial state, nothing is available as TLV container. */ | |
1236 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) | |
8aa9b586 | 1237 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; |
2225e79b | 1238 | access |= SNDRV_CTL_ELEM_ACCESS_USER; |
4ed56666 | 1239 | |
2225e79b TS |
1240 | /* |
1241 | * Check information and calculate the size of data specific to | |
1242 | * this userspace control. | |
1243 | */ | |
4ed56666 TS |
1244 | if (info->type < SNDRV_CTL_ELEM_TYPE_BOOLEAN || |
1245 | info->type > SNDRV_CTL_ELEM_TYPE_INTEGER64) | |
1da177e4 | 1246 | return -EINVAL; |
4ed56666 TS |
1247 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED && |
1248 | info->value.enumerated.items == 0) | |
1249 | return -EINVAL; | |
1250 | if (info->count < 1 || | |
1251 | info->count > max_value_counts[info->type]) | |
1252 | return -EINVAL; | |
4ed56666 | 1253 | private_size = value_sizes[info->type] * info->count; |
2225e79b TS |
1254 | |
1255 | /* | |
1256 | * Keep memory object for this userspace control. After passing this | |
1257 | * code block, the instance should be freed by snd_ctl_free_one(). | |
1258 | * | |
1259 | * Note that these elements in this control are locked. | |
1260 | */ | |
1261 | err = snd_ctl_new(&kctl, count, access, file); | |
1262 | if (err < 0) | |
1263 | return err; | |
e79d74ab | 1264 | memcpy(&kctl->id, &info->id, sizeof(kctl->id)); |
e1c78df1 | 1265 | kctl->private_data = kzalloc(sizeof(struct user_element) + private_size * count, |
2225e79b TS |
1266 | GFP_KERNEL); |
1267 | if (kctl->private_data == NULL) { | |
1268 | kfree(kctl); | |
1da177e4 | 1269 | return -ENOMEM; |
2225e79b TS |
1270 | } |
1271 | kctl->private_free = snd_ctl_elem_user_free; | |
1272 | ||
1273 | /* Set private data for this userspace control. */ | |
1274 | ue = (struct user_element *)kctl->private_data; | |
07f4d9d7 | 1275 | ue->card = card; |
1da177e4 | 1276 | ue->info = *info; |
86148e84 | 1277 | ue->info.access = 0; |
1da177e4 LT |
1278 | ue->elem_data = (char *)ue + sizeof(*ue); |
1279 | ue->elem_data_size = private_size; | |
8d448162 CL |
1280 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
1281 | err = snd_ctl_elem_init_enum_names(ue); | |
1282 | if (err < 0) { | |
2225e79b | 1283 | snd_ctl_free_one(kctl); |
8d448162 CL |
1284 | return err; |
1285 | } | |
1286 | } | |
2225e79b TS |
1287 | |
1288 | /* Set callback functions. */ | |
1289 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) | |
1290 | kctl->info = snd_ctl_elem_user_enum_info; | |
1291 | else | |
1292 | kctl->info = snd_ctl_elem_user_info; | |
1293 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
1294 | kctl->get = snd_ctl_elem_user_get; | |
1295 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
1296 | kctl->put = snd_ctl_elem_user_put; | |
b8e2204b | 1297 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) |
2225e79b TS |
1298 | kctl->tlv.c = snd_ctl_elem_user_tlv; |
1299 | ||
1300 | /* This function manage to free the instance on failure. */ | |
e1a7bfe3 | 1301 | down_write(&card->controls_rwsem); |
3103c08f | 1302 | err = __snd_ctl_add_replace(card, kctl, CTL_ADD_EXCLUSIVE); |
e1a7bfe3 TI |
1303 | if (err < 0) { |
1304 | snd_ctl_free_one(kctl); | |
1305 | goto unlock; | |
1306 | } | |
cab2ed74 TS |
1307 | offset = snd_ctl_get_ioff(kctl, &info->id); |
1308 | snd_ctl_build_ioff(&info->id, kctl, offset); | |
1309 | /* | |
1310 | * Here we cannot fill any field for the number of elements added by | |
1311 | * this operation because there're no specific fields. The usage of | |
1312 | * 'owner' field for this purpose may cause any bugs to userspace | |
1313 | * applications because the field originally means PID of a process | |
1314 | * which locks the element. | |
1315 | */ | |
1da177e4 | 1316 | |
1da177e4 | 1317 | card->user_ctl_count++; |
1da177e4 | 1318 | |
e1a7bfe3 TI |
1319 | unlock: |
1320 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
1321 | return 0; |
1322 | } | |
1323 | ||
82e9bae6 TI |
1324 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1325 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1326 | { |
82e9bae6 | 1327 | struct snd_ctl_elem_info info; |
cab2ed74 TS |
1328 | int err; |
1329 | ||
1da177e4 LT |
1330 | if (copy_from_user(&info, _info, sizeof(info))) |
1331 | return -EFAULT; | |
cab2ed74 TS |
1332 | err = snd_ctl_elem_add(file, &info, replace); |
1333 | if (err < 0) | |
1334 | return err; | |
1335 | if (copy_to_user(_info, &info, sizeof(info))) { | |
1336 | snd_ctl_remove_user_ctl(file, &info.id); | |
1337 | return -EFAULT; | |
1338 | } | |
1339 | ||
1340 | return 0; | |
1da177e4 LT |
1341 | } |
1342 | ||
82e9bae6 TI |
1343 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1344 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1345 | { |
82e9bae6 | 1346 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1347 | |
1348 | if (copy_from_user(&id, _id, sizeof(id))) | |
1349 | return -EFAULT; | |
f217ac59 | 1350 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1351 | } |
1352 | ||
82e9bae6 | 1353 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1354 | { |
1355 | int subscribe; | |
1356 | if (get_user(subscribe, ptr)) | |
1357 | return -EFAULT; | |
1358 | if (subscribe < 0) { | |
1359 | subscribe = file->subscribed; | |
1360 | if (put_user(subscribe, ptr)) | |
1361 | return -EFAULT; | |
1362 | return 0; | |
1363 | } | |
1364 | if (subscribe) { | |
1365 | file->subscribed = 1; | |
1366 | return 0; | |
1367 | } else if (file->subscribed) { | |
1368 | snd_ctl_empty_read_queue(file); | |
1369 | file->subscribed = 0; | |
1370 | } | |
1371 | return 0; | |
1372 | } | |
1373 | ||
450296f3 TS |
1374 | static int call_tlv_handler(struct snd_ctl_file *file, int op_flag, |
1375 | struct snd_kcontrol *kctl, | |
1376 | struct snd_ctl_elem_id *id, | |
1377 | unsigned int __user *buf, unsigned int size) | |
1378 | { | |
1379 | static const struct { | |
1380 | int op; | |
1381 | int perm; | |
1382 | } pairs[] = { | |
1383 | {SNDRV_CTL_TLV_OP_READ, SNDRV_CTL_ELEM_ACCESS_TLV_READ}, | |
1384 | {SNDRV_CTL_TLV_OP_WRITE, SNDRV_CTL_ELEM_ACCESS_TLV_WRITE}, | |
1385 | {SNDRV_CTL_TLV_OP_CMD, SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND}, | |
1386 | }; | |
1387 | struct snd_kcontrol_volatile *vd = &kctl->vd[snd_ctl_get_ioff(kctl, id)]; | |
1388 | int i; | |
450296f3 TS |
1389 | |
1390 | /* Check support of the request for this element. */ | |
1391 | for (i = 0; i < ARRAY_SIZE(pairs); ++i) { | |
1392 | if (op_flag == pairs[i].op && (vd->access & pairs[i].perm)) | |
1393 | break; | |
1394 | } | |
1395 | if (i == ARRAY_SIZE(pairs)) | |
1396 | return -ENXIO; | |
1397 | ||
1398 | if (kctl->tlv.c == NULL) | |
1399 | return -ENXIO; | |
1400 | ||
d61fe22c TS |
1401 | /* Write and command operations are not allowed for locked element. */ |
1402 | if (op_flag != SNDRV_CTL_TLV_OP_READ && | |
1403 | vd->owner != NULL && vd->owner != file) | |
450296f3 TS |
1404 | return -EPERM; |
1405 | ||
fb8027eb | 1406 | return kctl->tlv.c(kctl, op_flag, size, buf); |
450296f3 TS |
1407 | } |
1408 | ||
1409 | static int read_tlv_buf(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id, | |
1410 | unsigned int __user *buf, unsigned int size) | |
1411 | { | |
1412 | struct snd_kcontrol_volatile *vd = &kctl->vd[snd_ctl_get_ioff(kctl, id)]; | |
1413 | unsigned int len; | |
1414 | ||
1415 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ)) | |
1416 | return -ENXIO; | |
1417 | ||
1418 | if (kctl->tlv.p == NULL) | |
1419 | return -ENXIO; | |
1420 | ||
1421 | len = sizeof(unsigned int) * 2 + kctl->tlv.p[1]; | |
1422 | if (size < len) | |
1423 | return -ENOMEM; | |
1424 | ||
1425 | if (copy_to_user(buf, kctl->tlv.p, len)) | |
1426 | return -EFAULT; | |
1427 | ||
1428 | return 0; | |
1429 | } | |
1430 | ||
8aa9b586 | 1431 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
450296f3 | 1432 | struct snd_ctl_tlv __user *buf, |
8aa9b586 | 1433 | int op_flag) |
42750b04 | 1434 | { |
450296f3 | 1435 | struct snd_ctl_tlv header; |
1ba7862f | 1436 | unsigned int __user *container; |
450296f3 | 1437 | unsigned int container_size; |
42750b04 | 1438 | struct snd_kcontrol *kctl; |
450296f3 | 1439 | struct snd_ctl_elem_id id; |
8aa9b586 | 1440 | struct snd_kcontrol_volatile *vd; |
42750b04 | 1441 | |
450296f3 | 1442 | if (copy_from_user(&header, buf, sizeof(header))) |
42750b04 | 1443 | return -EFAULT; |
450296f3 TS |
1444 | |
1445 | /* In design of control core, numerical ID starts at 1. */ | |
1446 | if (header.numid == 0) | |
8aa9b586 | 1447 | return -EINVAL; |
450296f3 TS |
1448 | |
1449 | /* At least, container should include type and length fields. */ | |
1450 | if (header.length < sizeof(unsigned int) * 2) | |
c0bcdbdf | 1451 | return -EINVAL; |
450296f3 TS |
1452 | container_size = header.length; |
1453 | container = buf->tlv; | |
4c8099e9 | 1454 | |
450296f3 | 1455 | kctl = snd_ctl_find_numid(file->card, header.numid); |
4c8099e9 TS |
1456 | if (kctl == NULL) |
1457 | return -ENOENT; | |
1458 | ||
450296f3 TS |
1459 | /* Calculate index of the element in this set. */ |
1460 | id = kctl->id; | |
1461 | snd_ctl_build_ioff(&id, kctl, header.numid - id.numid); | |
1462 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
4c8099e9 | 1463 | |
8aa9b586 | 1464 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { |
450296f3 TS |
1465 | return call_tlv_handler(file, op_flag, kctl, &id, container, |
1466 | container_size); | |
8aa9b586 | 1467 | } else { |
450296f3 TS |
1468 | if (op_flag == SNDRV_CTL_TLV_OP_READ) { |
1469 | return read_tlv_buf(kctl, &id, container, | |
1470 | container_size); | |
1471 | } | |
8aa9b586 | 1472 | } |
4c8099e9 | 1473 | |
450296f3 TS |
1474 | /* Not supported. */ |
1475 | return -ENXIO; | |
42750b04 JK |
1476 | } |
1477 | ||
1da177e4 LT |
1478 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1479 | { | |
82e9bae6 TI |
1480 | struct snd_ctl_file *ctl; |
1481 | struct snd_card *card; | |
82e9bae6 | 1482 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1483 | void __user *argp = (void __user *)arg; |
1484 | int __user *ip = argp; | |
1485 | int err; | |
1486 | ||
1487 | ctl = file->private_data; | |
1488 | card = ctl->card; | |
7eaa943c TI |
1489 | if (snd_BUG_ON(!card)) |
1490 | return -ENXIO; | |
1da177e4 LT |
1491 | switch (cmd) { |
1492 | case SNDRV_CTL_IOCTL_PVERSION: | |
1493 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1494 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1495 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1496 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1497 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1498 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1499 | return snd_ctl_elem_info_user(ctl, argp); | |
1500 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1501 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1502 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1503 | return snd_ctl_elem_write_user(ctl, argp); | |
1504 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1505 | return snd_ctl_elem_lock(ctl, argp); | |
1506 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1507 | return snd_ctl_elem_unlock(ctl, argp); | |
1508 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1509 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1510 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1511 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1512 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1513 | return snd_ctl_elem_remove(ctl, argp); | |
1514 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1515 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 | 1516 | case SNDRV_CTL_IOCTL_TLV_READ: |
4c8099e9 TS |
1517 | down_read(&ctl->card->controls_rwsem); |
1518 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ); | |
1519 | up_read(&ctl->card->controls_rwsem); | |
1520 | return err; | |
8aa9b586 | 1521 | case SNDRV_CTL_IOCTL_TLV_WRITE: |
4c8099e9 TS |
1522 | down_write(&ctl->card->controls_rwsem); |
1523 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE); | |
1524 | up_write(&ctl->card->controls_rwsem); | |
1525 | return err; | |
8aa9b586 | 1526 | case SNDRV_CTL_IOCTL_TLV_COMMAND: |
4c8099e9 TS |
1527 | down_write(&ctl->card->controls_rwsem); |
1528 | err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD); | |
1529 | up_write(&ctl->card->controls_rwsem); | |
1530 | return err; | |
1da177e4 | 1531 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1532 | return -ENOPROTOOPT; |
1da177e4 LT |
1533 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1534 | #ifdef CONFIG_PM | |
1535 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1536 | #else | |
1537 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1538 | #endif | |
1539 | } | |
1540 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1541 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1542 | err = p->fioctl(card, ctl, cmd, arg); |
1543 | if (err != -ENOIOCTLCMD) { | |
1544 | up_read(&snd_ioctl_rwsem); | |
1545 | return err; | |
1546 | } | |
1547 | } | |
1548 | up_read(&snd_ioctl_rwsem); | |
bb009457 | 1549 | dev_dbg(card->dev, "unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1550 | return -ENOTTY; |
1551 | } | |
1552 | ||
82e9bae6 TI |
1553 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1554 | size_t count, loff_t * offset) | |
1da177e4 | 1555 | { |
82e9bae6 | 1556 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1557 | int err = 0; |
1558 | ssize_t result = 0; | |
1559 | ||
1560 | ctl = file->private_data; | |
7eaa943c TI |
1561 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1562 | return -ENXIO; | |
1da177e4 LT |
1563 | if (!ctl->subscribed) |
1564 | return -EBADFD; | |
82e9bae6 | 1565 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1566 | return -EINVAL; |
1567 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1568 | while (count >= sizeof(struct snd_ctl_event)) { |
1569 | struct snd_ctl_event ev; | |
1570 | struct snd_kctl_event *kev; | |
1da177e4 | 1571 | while (list_empty(&ctl->events)) { |
ac6424b9 | 1572 | wait_queue_entry_t wait; |
1da177e4 LT |
1573 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
1574 | err = -EAGAIN; | |
1575 | goto __end_lock; | |
1576 | } | |
1577 | init_waitqueue_entry(&wait, current); | |
1578 | add_wait_queue(&ctl->change_sleep, &wait); | |
1579 | set_current_state(TASK_INTERRUPTIBLE); | |
1580 | spin_unlock_irq(&ctl->read_lock); | |
1581 | schedule(); | |
1582 | remove_wait_queue(&ctl->change_sleep, &wait); | |
0914f796 TI |
1583 | if (ctl->card->shutdown) |
1584 | return -ENODEV; | |
1da177e4 | 1585 | if (signal_pending(current)) |
0e5d720c | 1586 | return -ERESTARTSYS; |
1da177e4 LT |
1587 | spin_lock_irq(&ctl->read_lock); |
1588 | } | |
1589 | kev = snd_kctl_event(ctl->events.next); | |
1590 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1591 | ev.data.elem.mask = kev->mask; | |
1592 | ev.data.elem.id = kev->id; | |
1593 | list_del(&kev->list); | |
1594 | spin_unlock_irq(&ctl->read_lock); | |
1595 | kfree(kev); | |
82e9bae6 | 1596 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1597 | err = -EFAULT; |
1598 | goto __end; | |
1599 | } | |
1600 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1601 | buffer += sizeof(struct snd_ctl_event); |
1602 | count -= sizeof(struct snd_ctl_event); | |
1603 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1604 | } |
1605 | __end_lock: | |
1606 | spin_unlock_irq(&ctl->read_lock); | |
1607 | __end: | |
1608 | return result > 0 ? result : err; | |
1609 | } | |
1610 | ||
680ef72a | 1611 | static __poll_t snd_ctl_poll(struct file *file, poll_table * wait) |
1da177e4 | 1612 | { |
680ef72a | 1613 | __poll_t mask; |
82e9bae6 | 1614 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1615 | |
1616 | ctl = file->private_data; | |
1617 | if (!ctl->subscribed) | |
1618 | return 0; | |
1619 | poll_wait(file, &ctl->change_sleep, wait); | |
1620 | ||
1621 | mask = 0; | |
1622 | if (!list_empty(&ctl->events)) | |
a9a08845 | 1623 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
1624 | |
1625 | return mask; | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * register the device-specific control-ioctls. | |
1630 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1631 | */ | |
1632 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1633 | { | |
82e9bae6 | 1634 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1635 | |
82e9bae6 | 1636 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1637 | if (pn == NULL) |
1638 | return -ENOMEM; | |
1639 | pn->fioctl = fcn; | |
1640 | down_write(&snd_ioctl_rwsem); | |
1641 | list_add_tail(&pn->list, lists); | |
1642 | up_write(&snd_ioctl_rwsem); | |
1643 | return 0; | |
1644 | } | |
1645 | ||
12cddbd8 TI |
1646 | /** |
1647 | * snd_ctl_register_ioctl - register the device-specific control-ioctls | |
1648 | * @fcn: ioctl callback function | |
1649 | * | |
1650 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1651 | */ | |
1da177e4 LT |
1652 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) |
1653 | { | |
1654 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1655 | } | |
c0d3fb39 TI |
1656 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1657 | ||
1da177e4 | 1658 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1659 | /** |
1660 | * snd_ctl_register_ioctl_compat - register the device-specific 32bit compat | |
1661 | * control-ioctls | |
1662 | * @fcn: ioctl callback function | |
1663 | */ | |
1da177e4 LT |
1664 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1665 | { | |
1666 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1667 | } | |
c0d3fb39 | 1668 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); |
1da177e4 LT |
1669 | #endif |
1670 | ||
1671 | /* | |
1672 | * de-register the device-specific control-ioctls. | |
1673 | */ | |
82e9bae6 TI |
1674 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1675 | struct list_head *lists) | |
1da177e4 | 1676 | { |
82e9bae6 | 1677 | struct snd_kctl_ioctl *p; |
1da177e4 | 1678 | |
7eaa943c TI |
1679 | if (snd_BUG_ON(!fcn)) |
1680 | return -EINVAL; | |
1da177e4 | 1681 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1682 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1683 | if (p->fioctl == fcn) { |
1684 | list_del(&p->list); | |
1685 | up_write(&snd_ioctl_rwsem); | |
1686 | kfree(p); | |
1687 | return 0; | |
1688 | } | |
1689 | } | |
1690 | up_write(&snd_ioctl_rwsem); | |
1691 | snd_BUG(); | |
1692 | return -EINVAL; | |
1693 | } | |
1694 | ||
12cddbd8 TI |
1695 | /** |
1696 | * snd_ctl_unregister_ioctl - de-register the device-specific control-ioctls | |
1697 | * @fcn: ioctl callback function to unregister | |
1698 | */ | |
1da177e4 LT |
1699 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) |
1700 | { | |
1701 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1702 | } | |
c0d3fb39 TI |
1703 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1704 | ||
1da177e4 | 1705 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1706 | /** |
1707 | * snd_ctl_unregister_ioctl - de-register the device-specific compat 32bit | |
1708 | * control-ioctls | |
1709 | * @fcn: ioctl callback function to unregister | |
1710 | */ | |
1da177e4 LT |
1711 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1712 | { | |
1713 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1714 | } | |
c0d3fb39 | 1715 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1716 | #endif |
1717 | ||
1718 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1719 | { | |
82e9bae6 | 1720 | struct snd_ctl_file *ctl; |
60aa4924 | 1721 | |
1da177e4 | 1722 | ctl = file->private_data; |
60aa4924 | 1723 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1724 | } |
1725 | ||
23c18d4b TI |
1726 | /* return the preferred subdevice number if already assigned; |
1727 | * otherwise return -1 | |
1728 | */ | |
1729 | int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type) | |
1730 | { | |
1731 | struct snd_ctl_file *kctl; | |
1732 | int subdevice = -1; | |
1733 | ||
1734 | read_lock(&card->ctl_files_rwlock); | |
1735 | list_for_each_entry(kctl, &card->ctl_files, list) { | |
1736 | if (kctl->pid == task_pid(current)) { | |
1737 | subdevice = kctl->preferred_subdevice[type]; | |
1738 | if (subdevice != -1) | |
1739 | break; | |
1740 | } | |
1741 | } | |
1742 | read_unlock(&card->ctl_files_rwlock); | |
1743 | return subdevice; | |
1744 | } | |
1745 | EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice); | |
1746 | ||
1da177e4 LT |
1747 | /* |
1748 | * ioctl32 compat | |
1749 | */ | |
1750 | #ifdef CONFIG_COMPAT | |
1751 | #include "control_compat.c" | |
1752 | #else | |
1753 | #define snd_ctl_ioctl_compat NULL | |
1754 | #endif | |
1755 | ||
1756 | /* | |
1757 | * INIT PART | |
1758 | */ | |
1759 | ||
9c2e08c5 | 1760 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1761 | { |
1762 | .owner = THIS_MODULE, | |
1763 | .read = snd_ctl_read, | |
1764 | .open = snd_ctl_open, | |
1765 | .release = snd_ctl_release, | |
02f4865f | 1766 | .llseek = no_llseek, |
1da177e4 LT |
1767 | .poll = snd_ctl_poll, |
1768 | .unlocked_ioctl = snd_ctl_ioctl, | |
1769 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1770 | .fasync = snd_ctl_fasync, | |
1771 | }; | |
1772 | ||
1da177e4 LT |
1773 | /* |
1774 | * registration of the control device | |
1775 | */ | |
82e9bae6 | 1776 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1777 | { |
82e9bae6 | 1778 | struct snd_card *card = device->device_data; |
1da177e4 | 1779 | |
40a4b263 TI |
1780 | return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1781 | &snd_ctl_f_ops, card, &card->ctl_dev); | |
1da177e4 LT |
1782 | } |
1783 | ||
1784 | /* | |
1785 | * disconnection of the control device | |
1786 | */ | |
82e9bae6 | 1787 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1788 | { |
82e9bae6 | 1789 | struct snd_card *card = device->device_data; |
82e9bae6 | 1790 | struct snd_ctl_file *ctl; |
1da177e4 | 1791 | |
d8009882 | 1792 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1793 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1794 | wake_up(&ctl->change_sleep); |
1795 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1796 | } | |
d8009882 | 1797 | read_unlock(&card->ctl_files_rwlock); |
c461482c | 1798 | |
40a4b263 | 1799 | return snd_unregister_device(&card->ctl_dev); |
1da177e4 LT |
1800 | } |
1801 | ||
1802 | /* | |
1803 | * free all controls | |
1804 | */ | |
82e9bae6 | 1805 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1806 | { |
82e9bae6 TI |
1807 | struct snd_card *card = device->device_data; |
1808 | struct snd_kcontrol *control; | |
1da177e4 LT |
1809 | |
1810 | down_write(&card->controls_rwsem); | |
1811 | while (!list_empty(&card->controls)) { | |
1812 | control = snd_kcontrol(card->controls.next); | |
1813 | snd_ctl_remove(card, control); | |
1814 | } | |
1815 | up_write(&card->controls_rwsem); | |
0fcd9f4b | 1816 | put_device(&card->ctl_dev); |
1da177e4 LT |
1817 | return 0; |
1818 | } | |
1819 | ||
1da177e4 LT |
1820 | /* |
1821 | * create control core: | |
1822 | * called from init.c | |
1823 | */ | |
82e9bae6 | 1824 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1825 | { |
f15ee210 | 1826 | static const struct snd_device_ops ops = { |
1da177e4 LT |
1827 | .dev_free = snd_ctl_dev_free, |
1828 | .dev_register = snd_ctl_dev_register, | |
1829 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 | 1830 | }; |
0fcd9f4b | 1831 | int err; |
1da177e4 | 1832 | |
7eaa943c TI |
1833 | if (snd_BUG_ON(!card)) |
1834 | return -ENXIO; | |
0fcd9f4b TI |
1835 | if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS)) |
1836 | return -ENXIO; | |
1837 | ||
1838 | snd_device_initialize(&card->ctl_dev, card); | |
1839 | dev_set_name(&card->ctl_dev, "controlC%d", card->number); | |
1840 | ||
1841 | err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1842 | if (err < 0) | |
1843 | put_device(&card->ctl_dev); | |
1844 | return err; | |
1da177e4 | 1845 | } |
b9ed4f2b TI |
1846 | |
1847 | /* | |
9600732b | 1848 | * Frequently used control callbacks/helpers |
b9ed4f2b | 1849 | */ |
12cddbd8 TI |
1850 | |
1851 | /** | |
1852 | * snd_ctl_boolean_mono_info - Helper function for a standard boolean info | |
1853 | * callback with a mono channel | |
1854 | * @kcontrol: the kcontrol instance | |
1855 | * @uinfo: info to store | |
1856 | * | |
1857 | * This is a function that can be used as info callback for a standard | |
1858 | * boolean control with a single mono channel. | |
1859 | */ | |
b9ed4f2b TI |
1860 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, |
1861 | struct snd_ctl_elem_info *uinfo) | |
1862 | { | |
1863 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1864 | uinfo->count = 1; | |
1865 | uinfo->value.integer.min = 0; | |
1866 | uinfo->value.integer.max = 1; | |
1867 | return 0; | |
1868 | } | |
b9ed4f2b TI |
1869 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); |
1870 | ||
12cddbd8 TI |
1871 | /** |
1872 | * snd_ctl_boolean_stereo_info - Helper function for a standard boolean info | |
1873 | * callback with stereo two channels | |
1874 | * @kcontrol: the kcontrol instance | |
1875 | * @uinfo: info to store | |
1876 | * | |
1877 | * This is a function that can be used as info callback for a standard | |
1878 | * boolean control with stereo two channels. | |
1879 | */ | |
b9ed4f2b TI |
1880 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, |
1881 | struct snd_ctl_elem_info *uinfo) | |
1882 | { | |
1883 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1884 | uinfo->count = 2; | |
1885 | uinfo->value.integer.min = 0; | |
1886 | uinfo->value.integer.max = 1; | |
1887 | return 0; | |
1888 | } | |
b9ed4f2b | 1889 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |
9600732b CL |
1890 | |
1891 | /** | |
1892 | * snd_ctl_enum_info - fills the info structure for an enumerated control | |
1893 | * @info: the structure to be filled | |
1894 | * @channels: the number of the control's channels; often one | |
1895 | * @items: the number of control values; also the size of @names | |
1896 | * @names: an array containing the names of all control values | |
1897 | * | |
1898 | * Sets all required fields in @info to their appropriate values. | |
1899 | * If the control's accessibility is not the default (readable and writable), | |
1900 | * the caller has to fill @info->access. | |
eb7c06e8 YB |
1901 | * |
1902 | * Return: Zero. | |
9600732b CL |
1903 | */ |
1904 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, | |
1905 | unsigned int items, const char *const names[]) | |
1906 | { | |
1907 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; | |
1908 | info->count = channels; | |
1909 | info->value.enumerated.items = items; | |
a7e6fb99 TI |
1910 | if (!items) |
1911 | return 0; | |
9600732b CL |
1912 | if (info->value.enumerated.item >= items) |
1913 | info->value.enumerated.item = items - 1; | |
df803e13 TI |
1914 | WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name), |
1915 | "ALSA: too long item name '%s'\n", | |
1916 | names[info->value.enumerated.item]); | |
9600732b CL |
1917 | strlcpy(info->value.enumerated.name, |
1918 | names[info->value.enumerated.item], | |
1919 | sizeof(info->value.enumerated.name)); | |
1920 | return 0; | |
1921 | } | |
1922 | EXPORT_SYMBOL(snd_ctl_enum_info); |