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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Routines for driver control interface | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
4 | * |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/threads.h> |
23 | #include <linux/interrupt.h> | |
da155d5b | 24 | #include <linux/module.h> |
1da177e4 LT |
25 | #include <linux/slab.h> |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/time.h> | |
28 | #include <sound/core.h> | |
29 | #include <sound/minors.h> | |
30 | #include <sound/info.h> | |
31 | #include <sound/control.h> | |
32 | ||
33 | /* max number of user-defined controls */ | |
34 | #define MAX_USER_CONTROLS 32 | |
5591bf07 | 35 | #define MAX_CONTROL_COUNT 1028 |
1da177e4 | 36 | |
82e9bae6 | 37 | struct snd_kctl_ioctl { |
1da177e4 LT |
38 | struct list_head list; /* list of all ioctls */ |
39 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 40 | }; |
1da177e4 LT |
41 | |
42 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
43 | static LIST_HEAD(snd_control_ioctls); | |
44 | #ifdef CONFIG_COMPAT | |
45 | static LIST_HEAD(snd_control_compat_ioctls); | |
46 | #endif | |
47 | ||
48 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
49 | { | |
1da177e4 | 50 | unsigned long flags; |
82e9bae6 TI |
51 | struct snd_card *card; |
52 | struct snd_ctl_file *ctl; | |
1da177e4 LT |
53 | int err; |
54 | ||
02f4865f TI |
55 | err = nonseekable_open(inode, file); |
56 | if (err < 0) | |
57 | return err; | |
58 | ||
f87135f5 | 59 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
60 | if (!card) { |
61 | err = -ENODEV; | |
62 | goto __error1; | |
63 | } | |
64 | err = snd_card_file_add(card, file); | |
65 | if (err < 0) { | |
66 | err = -ENODEV; | |
67 | goto __error1; | |
68 | } | |
69 | if (!try_module_get(card->module)) { | |
70 | err = -EFAULT; | |
71 | goto __error2; | |
72 | } | |
ca2c0966 | 73 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
74 | if (ctl == NULL) { |
75 | err = -ENOMEM; | |
76 | goto __error; | |
77 | } | |
78 | INIT_LIST_HEAD(&ctl->events); | |
79 | init_waitqueue_head(&ctl->change_sleep); | |
80 | spin_lock_init(&ctl->read_lock); | |
81 | ctl->card = card; | |
2529bba7 TI |
82 | ctl->prefer_pcm_subdevice = -1; |
83 | ctl->prefer_rawmidi_subdevice = -1; | |
25d27ede | 84 | ctl->pid = get_pid(task_pid(current)); |
1da177e4 LT |
85 | file->private_data = ctl; |
86 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
87 | list_add_tail(&ctl->list, &card->ctl_files); | |
88 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
89 | return 0; | |
90 | ||
91 | __error: | |
92 | module_put(card->module); | |
93 | __error2: | |
94 | snd_card_file_remove(card, file); | |
95 | __error1: | |
96 | return err; | |
97 | } | |
98 | ||
82e9bae6 | 99 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 100 | { |
7507e8da | 101 | unsigned long flags; |
82e9bae6 | 102 | struct snd_kctl_event *cread; |
1da177e4 | 103 | |
7507e8da | 104 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
105 | while (!list_empty(&ctl->events)) { |
106 | cread = snd_kctl_event(ctl->events.next); | |
107 | list_del(&cread->list); | |
108 | kfree(cread); | |
109 | } | |
7507e8da | 110 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
111 | } |
112 | ||
113 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
114 | { | |
115 | unsigned long flags; | |
82e9bae6 TI |
116 | struct snd_card *card; |
117 | struct snd_ctl_file *ctl; | |
118 | struct snd_kcontrol *control; | |
1da177e4 LT |
119 | unsigned int idx; |
120 | ||
121 | ctl = file->private_data; | |
1da177e4 LT |
122 | file->private_data = NULL; |
123 | card = ctl->card; | |
124 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
125 | list_del(&ctl->list); | |
126 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
127 | down_write(&card->controls_rwsem); | |
9244b2c3 | 128 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
129 | for (idx = 0; idx < control->count; idx++) |
130 | if (control->vd[idx].owner == ctl) | |
131 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
132 | up_write(&card->controls_rwsem); |
133 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 134 | put_pid(ctl->pid); |
1da177e4 LT |
135 | kfree(ctl); |
136 | module_put(card->module); | |
137 | snd_card_file_remove(card, file); | |
138 | return 0; | |
139 | } | |
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; | |
1da177e4 | 147 | |
7eaa943c TI |
148 | if (snd_BUG_ON(!card || !id)) |
149 | return; | |
1da177e4 LT |
150 | read_lock(&card->ctl_files_rwlock); |
151 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
152 | card->mixer_oss_change_count++; | |
153 | #endif | |
9244b2c3 | 154 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
155 | if (!ctl->subscribed) |
156 | continue; | |
157 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 158 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
159 | if (ev->id.numid == id->numid) { |
160 | ev->mask |= mask; | |
161 | goto _found; | |
162 | } | |
163 | } | |
ca2c0966 | 164 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
165 | if (ev) { |
166 | ev->id = *id; | |
167 | ev->mask = mask; | |
168 | list_add_tail(&ev->list, &ctl->events); | |
169 | } else { | |
170 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
171 | } | |
172 | _found: | |
173 | wake_up(&ctl->change_sleep); | |
174 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
175 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
176 | } | |
177 | read_unlock(&card->ctl_files_rwlock); | |
178 | } | |
179 | ||
c0d3fb39 TI |
180 | EXPORT_SYMBOL(snd_ctl_notify); |
181 | ||
1da177e4 LT |
182 | /** |
183 | * snd_ctl_new - create a control instance from the template | |
184 | * @control: the control template | |
185 | * @access: the default control access | |
186 | * | |
82e9bae6 | 187 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
188 | * to the new instance. It does not copy volatile data (access). |
189 | * | |
190 | * Returns the pointer of the new instance, or NULL on failure. | |
191 | */ | |
0b51ba07 AB |
192 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
193 | unsigned int access) | |
1da177e4 | 194 | { |
82e9bae6 | 195 | struct snd_kcontrol *kctl; |
1da177e4 LT |
196 | unsigned int idx; |
197 | ||
7eaa943c TI |
198 | if (snd_BUG_ON(!control || !control->count)) |
199 | return NULL; | |
5591bf07 DR |
200 | |
201 | if (control->count > MAX_CONTROL_COUNT) | |
202 | return NULL; | |
203 | ||
82e9bae6 | 204 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 TI |
205 | if (kctl == NULL) { |
206 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); | |
1da177e4 | 207 | return NULL; |
73e77ba0 | 208 | } |
1da177e4 LT |
209 | *kctl = *control; |
210 | for (idx = 0; idx < kctl->count; idx++) | |
211 | kctl->vd[idx].access = access; | |
212 | return kctl; | |
213 | } | |
214 | ||
215 | /** | |
216 | * snd_ctl_new1 - create a control instance from the template | |
217 | * @ncontrol: the initialization record | |
218 | * @private_data: the private data to set | |
219 | * | |
82e9bae6 | 220 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
221 | * template. When the access field of ncontrol is 0, it's assumed as |
222 | * READWRITE access. When the count field is 0, it's assumes as one. | |
223 | * | |
224 | * Returns the pointer of the newly generated instance, or NULL on failure. | |
225 | */ | |
82e9bae6 TI |
226 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
227 | void *private_data) | |
1da177e4 | 228 | { |
82e9bae6 | 229 | struct snd_kcontrol kctl; |
1da177e4 LT |
230 | unsigned int access; |
231 | ||
7eaa943c TI |
232 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
233 | return NULL; | |
1da177e4 LT |
234 | memset(&kctl, 0, sizeof(kctl)); |
235 | kctl.id.iface = ncontrol->iface; | |
236 | kctl.id.device = ncontrol->device; | |
237 | kctl.id.subdevice = ncontrol->subdevice; | |
366840d7 | 238 | if (ncontrol->name) { |
1da177e4 | 239 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
366840d7 MB |
240 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
241 | snd_printk(KERN_WARNING | |
242 | "Control name '%s' truncated to '%s'\n", | |
243 | ncontrol->name, kctl.id.name); | |
244 | } | |
1da177e4 LT |
245 | kctl.id.index = ncontrol->index; |
246 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
247 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 | 248 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
a8d372f1 | 249 | SNDRV_CTL_ELEM_ACCESS_VOLATILE| |
8aa9b586 | 250 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
a75d7a4c CL |
251 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
252 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| | |
253 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
254 | kctl.info = ncontrol->info; |
255 | kctl.get = ncontrol->get; | |
256 | kctl.put = ncontrol->put; | |
8aa9b586 | 257 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
258 | kctl.private_value = ncontrol->private_value; |
259 | kctl.private_data = private_data; | |
260 | return snd_ctl_new(&kctl, access); | |
261 | } | |
262 | ||
c0d3fb39 TI |
263 | EXPORT_SYMBOL(snd_ctl_new1); |
264 | ||
1da177e4 LT |
265 | /** |
266 | * snd_ctl_free_one - release the control instance | |
267 | * @kcontrol: the control instance | |
268 | * | |
269 | * Releases the control instance created via snd_ctl_new() | |
270 | * or snd_ctl_new1(). | |
271 | * Don't call this after the control was added to the card. | |
272 | */ | |
82e9bae6 | 273 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
274 | { |
275 | if (kcontrol) { | |
276 | if (kcontrol->private_free) | |
277 | kcontrol->private_free(kcontrol); | |
278 | kfree(kcontrol); | |
279 | } | |
280 | } | |
281 | ||
c0d3fb39 TI |
282 | EXPORT_SYMBOL(snd_ctl_free_one); |
283 | ||
0e82e5fa CL |
284 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
285 | unsigned int count) | |
1da177e4 | 286 | { |
82e9bae6 | 287 | struct snd_kcontrol *kctl; |
1da177e4 | 288 | |
9244b2c3 | 289 | list_for_each_entry(kctl, &card->controls, list) { |
7c733587 | 290 | if (kctl->id.numid < card->last_numid + 1 + count && |
0e82e5fa CL |
291 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
292 | card->last_numid = kctl->id.numid + kctl->count - 1; | |
293 | return true; | |
294 | } | |
1da177e4 | 295 | } |
0e82e5fa | 296 | return false; |
1da177e4 LT |
297 | } |
298 | ||
82e9bae6 | 299 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 | 300 | { |
0e82e5fa | 301 | unsigned int iter = 100000; |
1da177e4 | 302 | |
0e82e5fa | 303 | while (snd_ctl_remove_numid_conflict(card, count)) { |
1da177e4 LT |
304 | if (--iter == 0) { |
305 | /* this situation is very unlikely */ | |
306 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
307 | return -ENOMEM; | |
308 | } | |
1da177e4 LT |
309 | } |
310 | return 0; | |
311 | } | |
312 | ||
313 | /** | |
314 | * snd_ctl_add - add the control instance to the card | |
315 | * @card: the card instance | |
316 | * @kcontrol: the control instance to add | |
317 | * | |
318 | * Adds the control instance created via snd_ctl_new() or | |
319 | * snd_ctl_new1() to the given card. Assigns also an unique | |
320 | * numid used for fast search. | |
321 | * | |
322 | * Returns zero if successful, or a negative error code on failure. | |
323 | * | |
324 | * It frees automatically the control which cannot be added. | |
325 | */ | |
82e9bae6 | 326 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 327 | { |
82e9bae6 | 328 | struct snd_ctl_elem_id id; |
1da177e4 | 329 | unsigned int idx; |
c6077b30 | 330 | int err = -EINVAL; |
1da177e4 | 331 | |
73e77ba0 | 332 | if (! kcontrol) |
c6077b30 | 333 | return err; |
7eaa943c TI |
334 | if (snd_BUG_ON(!card || !kcontrol->info)) |
335 | goto error; | |
1da177e4 LT |
336 | id = kcontrol->id; |
337 | down_write(&card->controls_rwsem); | |
338 | if (snd_ctl_find_id(card, &id)) { | |
339 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
340 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
341 | id.iface, | |
342 | id.device, | |
343 | id.subdevice, | |
344 | id.name, | |
345 | id.index); | |
c6077b30 TI |
346 | err = -EBUSY; |
347 | goto error; | |
1da177e4 LT |
348 | } |
349 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
350 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
351 | err = -ENOMEM; |
352 | goto error; | |
1da177e4 LT |
353 | } |
354 | list_add_tail(&kcontrol->list, &card->controls); | |
355 | card->controls_count += kcontrol->count; | |
356 | kcontrol->id.numid = card->last_numid + 1; | |
357 | card->last_numid += kcontrol->count; | |
358 | up_write(&card->controls_rwsem); | |
359 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
360 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
361 | return 0; | |
c6077b30 TI |
362 | |
363 | error: | |
364 | snd_ctl_free_one(kcontrol); | |
365 | return err; | |
1da177e4 LT |
366 | } |
367 | ||
c0d3fb39 TI |
368 | EXPORT_SYMBOL(snd_ctl_add); |
369 | ||
66b5b972 DP |
370 | /** |
371 | * snd_ctl_replace - replace the control instance of the card | |
372 | * @card: the card instance | |
373 | * @kcontrol: the control instance to replace | |
374 | * @add_on_replace: add the control if not already added | |
375 | * | |
376 | * Replaces the given control. If the given control does not exist | |
377 | * and the add_on_replace flag is set, the control is added. If the | |
378 | * control exists, it is destroyed first. | |
379 | * | |
380 | * Returns zero if successful, or a negative error code on failure. | |
381 | * | |
382 | * It frees automatically the control which cannot be added or replaced. | |
383 | */ | |
384 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, | |
385 | bool add_on_replace) | |
386 | { | |
387 | struct snd_ctl_elem_id id; | |
388 | unsigned int idx; | |
389 | struct snd_kcontrol *old; | |
390 | int ret; | |
391 | ||
392 | if (!kcontrol) | |
393 | return -EINVAL; | |
394 | if (snd_BUG_ON(!card || !kcontrol->info)) { | |
395 | ret = -EINVAL; | |
396 | goto error; | |
397 | } | |
398 | id = kcontrol->id; | |
399 | down_write(&card->controls_rwsem); | |
400 | old = snd_ctl_find_id(card, &id); | |
401 | if (!old) { | |
402 | if (add_on_replace) | |
403 | goto add; | |
404 | up_write(&card->controls_rwsem); | |
405 | ret = -EINVAL; | |
406 | goto error; | |
407 | } | |
408 | ret = snd_ctl_remove(card, old); | |
409 | if (ret < 0) { | |
410 | up_write(&card->controls_rwsem); | |
411 | goto error; | |
412 | } | |
413 | add: | |
414 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
415 | up_write(&card->controls_rwsem); | |
416 | ret = -ENOMEM; | |
417 | goto error; | |
418 | } | |
419 | list_add_tail(&kcontrol->list, &card->controls); | |
420 | card->controls_count += kcontrol->count; | |
421 | kcontrol->id.numid = card->last_numid + 1; | |
422 | card->last_numid += kcontrol->count; | |
423 | up_write(&card->controls_rwsem); | |
424 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
425 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
426 | return 0; | |
427 | ||
428 | error: | |
429 | snd_ctl_free_one(kcontrol); | |
430 | return ret; | |
431 | } | |
432 | EXPORT_SYMBOL(snd_ctl_replace); | |
433 | ||
1da177e4 LT |
434 | /** |
435 | * snd_ctl_remove - remove the control from the card and release it | |
436 | * @card: the card instance | |
437 | * @kcontrol: the control instance to remove | |
438 | * | |
439 | * Removes the control from the card and then releases the instance. | |
440 | * You don't need to call snd_ctl_free_one(). You must be in | |
441 | * the write lock - down_write(&card->controls_rwsem). | |
442 | * | |
443 | * Returns 0 if successful, or a negative error code on failure. | |
444 | */ | |
82e9bae6 | 445 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 446 | { |
82e9bae6 | 447 | struct snd_ctl_elem_id id; |
1da177e4 LT |
448 | unsigned int idx; |
449 | ||
7eaa943c TI |
450 | if (snd_BUG_ON(!card || !kcontrol)) |
451 | return -EINVAL; | |
1da177e4 LT |
452 | list_del(&kcontrol->list); |
453 | card->controls_count -= kcontrol->count; | |
454 | id = kcontrol->id; | |
455 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
456 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
457 | snd_ctl_free_one(kcontrol); | |
458 | return 0; | |
459 | } | |
460 | ||
c0d3fb39 TI |
461 | EXPORT_SYMBOL(snd_ctl_remove); |
462 | ||
1da177e4 LT |
463 | /** |
464 | * snd_ctl_remove_id - remove the control of the given id and release it | |
465 | * @card: the card instance | |
466 | * @id: the control id to remove | |
467 | * | |
468 | * Finds the control instance with the given id, removes it from the | |
469 | * card list and releases it. | |
470 | * | |
471 | * Returns 0 if successful, or a negative error code on failure. | |
472 | */ | |
82e9bae6 | 473 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 474 | { |
82e9bae6 | 475 | struct snd_kcontrol *kctl; |
1da177e4 LT |
476 | int ret; |
477 | ||
478 | down_write(&card->controls_rwsem); | |
479 | kctl = snd_ctl_find_id(card, id); | |
480 | if (kctl == NULL) { | |
481 | up_write(&card->controls_rwsem); | |
482 | return -ENOENT; | |
483 | } | |
484 | ret = snd_ctl_remove(card, kctl); | |
485 | up_write(&card->controls_rwsem); | |
486 | return ret; | |
487 | } | |
488 | ||
c0d3fb39 TI |
489 | EXPORT_SYMBOL(snd_ctl_remove_id); |
490 | ||
1da177e4 | 491 | /** |
f217ac59 | 492 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
493 | * @file: active control handle |
494 | * @id: the control id to remove | |
495 | * | |
496 | * Finds the control instance with the given id, removes it from the | |
497 | * card list and releases it. | |
498 | * | |
499 | * Returns 0 if successful, or a negative error code on failure. | |
500 | */ | |
f217ac59 CL |
501 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
502 | struct snd_ctl_elem_id *id) | |
1da177e4 | 503 | { |
82e9bae6 TI |
504 | struct snd_card *card = file->card; |
505 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
506 | int idx, ret; |
507 | ||
508 | down_write(&card->controls_rwsem); | |
509 | kctl = snd_ctl_find_id(card, id); | |
510 | if (kctl == NULL) { | |
317b8081 CL |
511 | ret = -ENOENT; |
512 | goto error; | |
1da177e4 | 513 | } |
18dd0aa5 CL |
514 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
515 | ret = -EINVAL; | |
516 | goto error; | |
517 | } | |
1da177e4 LT |
518 | for (idx = 0; idx < kctl->count; idx++) |
519 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
520 | ret = -EBUSY; |
521 | goto error; | |
1da177e4 LT |
522 | } |
523 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
524 | if (ret < 0) |
525 | goto error; | |
526 | card->user_ctl_count--; | |
317b8081 | 527 | error: |
1da177e4 LT |
528 | up_write(&card->controls_rwsem); |
529 | return ret; | |
530 | } | |
531 | ||
3cbdd753 TI |
532 | /** |
533 | * snd_ctl_activate_id - activate/inactivate the control of the given id | |
534 | * @card: the card instance | |
535 | * @id: the control id to activate/inactivate | |
536 | * @active: non-zero to activate | |
537 | * | |
538 | * Finds the control instance with the given id, and activate or | |
539 | * inactivate the control together with notification, if changed. | |
540 | * | |
541 | * Returns 0 if unchanged, 1 if changed, or a negative error code on failure. | |
542 | */ | |
543 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, | |
544 | int active) | |
545 | { | |
546 | struct snd_kcontrol *kctl; | |
547 | struct snd_kcontrol_volatile *vd; | |
548 | unsigned int index_offset; | |
549 | int ret; | |
550 | ||
551 | down_write(&card->controls_rwsem); | |
552 | kctl = snd_ctl_find_id(card, id); | |
553 | if (kctl == NULL) { | |
554 | ret = -ENOENT; | |
555 | goto unlock; | |
556 | } | |
557 | index_offset = snd_ctl_get_ioff(kctl, &kctl->id); | |
558 | vd = &kctl->vd[index_offset]; | |
559 | ret = 0; | |
560 | if (active) { | |
561 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) | |
562 | goto unlock; | |
563 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
564 | } else { | |
565 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) | |
566 | goto unlock; | |
567 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
568 | } | |
569 | ret = 1; | |
570 | unlock: | |
571 | up_write(&card->controls_rwsem); | |
572 | if (ret > 0) | |
573 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); | |
574 | return ret; | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); | |
577 | ||
1da177e4 LT |
578 | /** |
579 | * snd_ctl_rename_id - replace the id of a control on the card | |
580 | * @card: the card instance | |
581 | * @src_id: the old id | |
582 | * @dst_id: the new id | |
583 | * | |
584 | * Finds the control with the old id from the card, and replaces the | |
585 | * id with the new one. | |
586 | * | |
587 | * Returns zero if successful, or a negative error code on failure. | |
588 | */ | |
82e9bae6 TI |
589 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
590 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 591 | { |
82e9bae6 | 592 | struct snd_kcontrol *kctl; |
1da177e4 LT |
593 | |
594 | down_write(&card->controls_rwsem); | |
595 | kctl = snd_ctl_find_id(card, src_id); | |
596 | if (kctl == NULL) { | |
597 | up_write(&card->controls_rwsem); | |
598 | return -ENOENT; | |
599 | } | |
600 | kctl->id = *dst_id; | |
601 | kctl->id.numid = card->last_numid + 1; | |
602 | card->last_numid += kctl->count; | |
603 | up_write(&card->controls_rwsem); | |
604 | return 0; | |
605 | } | |
606 | ||
c0d3fb39 TI |
607 | EXPORT_SYMBOL(snd_ctl_rename_id); |
608 | ||
1da177e4 LT |
609 | /** |
610 | * snd_ctl_find_numid - find the control instance with the given number-id | |
611 | * @card: the card instance | |
612 | * @numid: the number-id to search | |
613 | * | |
614 | * Finds the control instance with the given number-id from the card. | |
615 | * | |
616 | * Returns the pointer of the instance if found, or NULL if not. | |
617 | * | |
618 | * The caller must down card->controls_rwsem before calling this function | |
619 | * (if the race condition can happen). | |
620 | */ | |
82e9bae6 | 621 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 622 | { |
82e9bae6 | 623 | struct snd_kcontrol *kctl; |
1da177e4 | 624 | |
7eaa943c TI |
625 | if (snd_BUG_ON(!card || !numid)) |
626 | return NULL; | |
9244b2c3 | 627 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
628 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
629 | return kctl; | |
630 | } | |
631 | return NULL; | |
632 | } | |
633 | ||
c0d3fb39 TI |
634 | EXPORT_SYMBOL(snd_ctl_find_numid); |
635 | ||
1da177e4 LT |
636 | /** |
637 | * snd_ctl_find_id - find the control instance with the given id | |
638 | * @card: the card instance | |
639 | * @id: the id to search | |
640 | * | |
641 | * Finds the control instance with the given id from the card. | |
642 | * | |
643 | * Returns the pointer of the instance if found, or NULL if not. | |
644 | * | |
645 | * The caller must down card->controls_rwsem before calling this function | |
646 | * (if the race condition can happen). | |
647 | */ | |
82e9bae6 TI |
648 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
649 | struct snd_ctl_elem_id *id) | |
1da177e4 | 650 | { |
82e9bae6 | 651 | struct snd_kcontrol *kctl; |
1da177e4 | 652 | |
7eaa943c TI |
653 | if (snd_BUG_ON(!card || !id)) |
654 | return NULL; | |
1da177e4 LT |
655 | if (id->numid != 0) |
656 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 657 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
658 | if (kctl->id.iface != id->iface) |
659 | continue; | |
660 | if (kctl->id.device != id->device) | |
661 | continue; | |
662 | if (kctl->id.subdevice != id->subdevice) | |
663 | continue; | |
664 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
665 | continue; | |
666 | if (kctl->id.index > id->index) | |
667 | continue; | |
668 | if (kctl->id.index + kctl->count <= id->index) | |
669 | continue; | |
670 | return kctl; | |
671 | } | |
672 | return NULL; | |
673 | } | |
674 | ||
c0d3fb39 TI |
675 | EXPORT_SYMBOL(snd_ctl_find_id); |
676 | ||
82e9bae6 | 677 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
678 | unsigned int cmd, void __user *arg) |
679 | { | |
82e9bae6 | 680 | struct snd_ctl_card_info *info; |
1da177e4 | 681 | |
ca2c0966 | 682 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
683 | if (! info) |
684 | return -ENOMEM; | |
685 | down_read(&snd_ioctl_rwsem); | |
686 | info->card = card->number; | |
687 | strlcpy(info->id, card->id, sizeof(info->id)); | |
688 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
689 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
690 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
691 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
692 | strlcpy(info->components, card->components, sizeof(info->components)); | |
693 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 694 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
695 | kfree(info); |
696 | return -EFAULT; | |
697 | } | |
698 | kfree(info); | |
699 | return 0; | |
700 | } | |
701 | ||
82e9bae6 TI |
702 | static int snd_ctl_elem_list(struct snd_card *card, |
703 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
704 | { |
705 | struct list_head *plist; | |
82e9bae6 TI |
706 | struct snd_ctl_elem_list list; |
707 | struct snd_kcontrol *kctl; | |
708 | struct snd_ctl_elem_id *dst, *id; | |
78fa2c4d | 709 | unsigned int offset, space, jidx; |
1da177e4 LT |
710 | |
711 | if (copy_from_user(&list, _list, sizeof(list))) | |
712 | return -EFAULT; | |
713 | offset = list.offset; | |
714 | space = list.space; | |
1da177e4 LT |
715 | /* try limit maximum space */ |
716 | if (space > 16384) | |
717 | return -ENOMEM; | |
718 | if (space > 0) { | |
719 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 720 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
721 | if (dst == NULL) |
722 | return -ENOMEM; | |
723 | down_read(&card->controls_rwsem); | |
724 | list.count = card->controls_count; | |
725 | plist = card->controls.next; | |
726 | while (plist != &card->controls) { | |
727 | if (offset == 0) | |
728 | break; | |
729 | kctl = snd_kcontrol(plist); | |
730 | if (offset < kctl->count) | |
731 | break; | |
732 | offset -= kctl->count; | |
733 | plist = plist->next; | |
734 | } | |
735 | list.used = 0; | |
736 | id = dst; | |
737 | while (space > 0 && plist != &card->controls) { | |
738 | kctl = snd_kcontrol(plist); | |
739 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
740 | snd_ctl_build_ioff(id, kctl, jidx); | |
741 | id++; | |
742 | space--; | |
743 | list.used++; | |
744 | } | |
745 | plist = plist->next; | |
746 | offset = 0; | |
747 | } | |
748 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
749 | if (list.used > 0 && |
750 | copy_to_user(list.pids, dst, | |
751 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
752 | vfree(dst); |
753 | return -EFAULT; | |
754 | } | |
755 | vfree(dst); | |
756 | } else { | |
757 | down_read(&card->controls_rwsem); | |
758 | list.count = card->controls_count; | |
759 | up_read(&card->controls_rwsem); | |
760 | } | |
761 | if (copy_to_user(_list, &list, sizeof(list))) | |
762 | return -EFAULT; | |
763 | return 0; | |
764 | } | |
765 | ||
82e9bae6 TI |
766 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
767 | struct snd_ctl_elem_info *info) | |
1da177e4 | 768 | { |
82e9bae6 TI |
769 | struct snd_card *card = ctl->card; |
770 | struct snd_kcontrol *kctl; | |
771 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
772 | unsigned int index_offset; |
773 | int result; | |
774 | ||
775 | down_read(&card->controls_rwsem); | |
776 | kctl = snd_ctl_find_id(card, &info->id); | |
777 | if (kctl == NULL) { | |
778 | up_read(&card->controls_rwsem); | |
779 | return -ENOENT; | |
780 | } | |
781 | #ifdef CONFIG_SND_DEBUG | |
782 | info->access = 0; | |
783 | #endif | |
784 | result = kctl->info(kctl, info); | |
785 | if (result >= 0) { | |
7eaa943c | 786 | snd_BUG_ON(info->access); |
1da177e4 LT |
787 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
788 | vd = &kctl->vd[index_offset]; | |
789 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
790 | info->access = vd->access; | |
791 | if (vd->owner) { | |
792 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
793 | if (vd->owner == ctl) | |
794 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 795 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
796 | } else { |
797 | info->owner = -1; | |
798 | } | |
799 | } | |
800 | up_read(&card->controls_rwsem); | |
801 | return result; | |
802 | } | |
803 | ||
82e9bae6 TI |
804 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
805 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 806 | { |
82e9bae6 | 807 | struct snd_ctl_elem_info info; |
1da177e4 LT |
808 | int result; |
809 | ||
810 | if (copy_from_user(&info, _info, sizeof(info))) | |
811 | return -EFAULT; | |
64649400 | 812 | snd_power_lock(ctl->card); |
cbac4b0c | 813 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
814 | if (result >= 0) |
815 | result = snd_ctl_elem_info(ctl, &info); | |
816 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
817 | if (result >= 0) |
818 | if (copy_to_user(_info, &info, sizeof(info))) | |
819 | return -EFAULT; | |
820 | return result; | |
821 | } | |
822 | ||
d3bd67cd TI |
823 | static int snd_ctl_elem_read(struct snd_card *card, |
824 | struct snd_ctl_elem_value *control) | |
1da177e4 | 825 | { |
82e9bae6 TI |
826 | struct snd_kcontrol *kctl; |
827 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 828 | unsigned int index_offset; |
8ace4f3c | 829 | int result; |
1da177e4 LT |
830 | |
831 | down_read(&card->controls_rwsem); | |
832 | kctl = snd_ctl_find_id(card, &control->id); | |
833 | if (kctl == NULL) { | |
834 | result = -ENOENT; | |
835 | } else { | |
836 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
837 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
838 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
839 | kctl->get != NULL) { | |
840 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
841 | result = kctl->get(kctl, control); | |
842 | } else | |
843 | result = -EPERM; | |
1da177e4 LT |
844 | } |
845 | up_read(&card->controls_rwsem); | |
846 | return result; | |
847 | } | |
848 | ||
82e9bae6 TI |
849 | static int snd_ctl_elem_read_user(struct snd_card *card, |
850 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 851 | { |
82e9bae6 | 852 | struct snd_ctl_elem_value *control; |
1da177e4 | 853 | int result; |
ef44a1ec LZ |
854 | |
855 | control = memdup_user(_control, sizeof(*control)); | |
856 | if (IS_ERR(control)) | |
857 | return PTR_ERR(control); | |
858 | ||
64649400 | 859 | snd_power_lock(card); |
cbac4b0c | 860 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
861 | if (result >= 0) |
862 | result = snd_ctl_elem_read(card, control); | |
863 | snd_power_unlock(card); | |
1da177e4 LT |
864 | if (result >= 0) |
865 | if (copy_to_user(_control, control, sizeof(*control))) | |
866 | result = -EFAULT; | |
867 | kfree(control); | |
868 | return result; | |
869 | } | |
870 | ||
d3bd67cd TI |
871 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
872 | struct snd_ctl_elem_value *control) | |
1da177e4 | 873 | { |
82e9bae6 TI |
874 | struct snd_kcontrol *kctl; |
875 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 876 | unsigned int index_offset; |
8ace4f3c | 877 | int result; |
1da177e4 LT |
878 | |
879 | down_read(&card->controls_rwsem); | |
880 | kctl = snd_ctl_find_id(card, &control->id); | |
881 | if (kctl == NULL) { | |
882 | result = -ENOENT; | |
883 | } else { | |
884 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
885 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
886 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
887 | kctl->put == NULL || | |
888 | (file && vd->owner && vd->owner != file)) { | |
889 | result = -EPERM; | |
1da177e4 | 890 | } else { |
8ace4f3c TI |
891 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
892 | result = kctl->put(kctl, control); | |
893 | } | |
894 | if (result > 0) { | |
895 | up_read(&card->controls_rwsem); | |
896 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
897 | &control->id); | |
898 | return 0; | |
1da177e4 LT |
899 | } |
900 | } | |
901 | up_read(&card->controls_rwsem); | |
902 | return result; | |
903 | } | |
904 | ||
82e9bae6 TI |
905 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
906 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 907 | { |
82e9bae6 | 908 | struct snd_ctl_elem_value *control; |
64649400 | 909 | struct snd_card *card; |
1da177e4 LT |
910 | int result; |
911 | ||
ef44a1ec LZ |
912 | control = memdup_user(_control, sizeof(*control)); |
913 | if (IS_ERR(control)) | |
914 | return PTR_ERR(control); | |
915 | ||
64649400 GP |
916 | card = file->card; |
917 | snd_power_lock(card); | |
cbac4b0c | 918 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
919 | if (result >= 0) |
920 | result = snd_ctl_elem_write(card, file, control); | |
921 | snd_power_unlock(card); | |
1da177e4 LT |
922 | if (result >= 0) |
923 | if (copy_to_user(_control, control, sizeof(*control))) | |
924 | result = -EFAULT; | |
925 | kfree(control); | |
926 | return result; | |
927 | } | |
928 | ||
82e9bae6 TI |
929 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
930 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 931 | { |
82e9bae6 TI |
932 | struct snd_card *card = file->card; |
933 | struct snd_ctl_elem_id id; | |
934 | struct snd_kcontrol *kctl; | |
935 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
936 | int result; |
937 | ||
938 | if (copy_from_user(&id, _id, sizeof(id))) | |
939 | return -EFAULT; | |
940 | down_write(&card->controls_rwsem); | |
941 | kctl = snd_ctl_find_id(card, &id); | |
942 | if (kctl == NULL) { | |
943 | result = -ENOENT; | |
944 | } else { | |
945 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
946 | if (vd->owner != NULL) | |
947 | result = -EBUSY; | |
948 | else { | |
949 | vd->owner = file; | |
1da177e4 LT |
950 | result = 0; |
951 | } | |
952 | } | |
953 | up_write(&card->controls_rwsem); | |
954 | return result; | |
955 | } | |
956 | ||
82e9bae6 TI |
957 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
958 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 959 | { |
82e9bae6 TI |
960 | struct snd_card *card = file->card; |
961 | struct snd_ctl_elem_id id; | |
962 | struct snd_kcontrol *kctl; | |
963 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
964 | int result; |
965 | ||
966 | if (copy_from_user(&id, _id, sizeof(id))) | |
967 | return -EFAULT; | |
968 | down_write(&card->controls_rwsem); | |
969 | kctl = snd_ctl_find_id(card, &id); | |
970 | if (kctl == NULL) { | |
971 | result = -ENOENT; | |
972 | } else { | |
973 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
974 | if (vd->owner == NULL) | |
975 | result = -EINVAL; | |
976 | else if (vd->owner != file) | |
977 | result = -EPERM; | |
978 | else { | |
979 | vd->owner = NULL; | |
1da177e4 LT |
980 | result = 0; |
981 | } | |
982 | } | |
983 | up_write(&card->controls_rwsem); | |
984 | return result; | |
985 | } | |
986 | ||
987 | struct user_element { | |
82e9bae6 | 988 | struct snd_ctl_elem_info info; |
1da177e4 LT |
989 | void *elem_data; /* element data */ |
990 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
991 | void *tlv_data; /* TLV data */ |
992 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 | 993 | void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4 LT |
994 | }; |
995 | ||
82e9bae6 TI |
996 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
997 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
998 | { |
999 | struct user_element *ue = kcontrol->private_data; | |
1000 | ||
1001 | *uinfo = ue->info; | |
1002 | return 0; | |
1003 | } | |
1004 | ||
8d448162 CL |
1005 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
1006 | struct snd_ctl_elem_info *uinfo) | |
1007 | { | |
1008 | struct user_element *ue = kcontrol->private_data; | |
1009 | const char *names; | |
1010 | unsigned int item; | |
1011 | ||
1012 | item = uinfo->value.enumerated.item; | |
1013 | ||
1014 | *uinfo = ue->info; | |
1015 | ||
1016 | item = min(item, uinfo->value.enumerated.items - 1); | |
1017 | uinfo->value.enumerated.item = item; | |
1018 | ||
1019 | names = ue->priv_data; | |
1020 | for (; item > 0; --item) | |
1021 | names += strlen(names) + 1; | |
1022 | strcpy(uinfo->value.enumerated.name, names); | |
1023 | ||
1024 | return 0; | |
1025 | } | |
1026 | ||
82e9bae6 TI |
1027 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
1028 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1029 | { |
1030 | struct user_element *ue = kcontrol->private_data; | |
1031 | ||
1032 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
1033 | return 0; | |
1034 | } | |
1035 | ||
82e9bae6 TI |
1036 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
1037 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1038 | { |
1039 | int change; | |
1040 | struct user_element *ue = kcontrol->private_data; | |
1041 | ||
1042 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
1043 | if (change) | |
1044 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
1045 | return change; | |
1046 | } | |
1047 | ||
8aa9b586 JK |
1048 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
1049 | int op_flag, | |
1050 | unsigned int size, | |
1051 | unsigned int __user *tlv) | |
1052 | { | |
1053 | struct user_element *ue = kcontrol->private_data; | |
1054 | int change = 0; | |
1055 | void *new_data; | |
1056 | ||
1057 | if (op_flag > 0) { | |
1058 | if (size > 1024 * 128) /* sane value */ | |
1059 | return -EINVAL; | |
ef44a1ec LZ |
1060 | |
1061 | new_data = memdup_user(tlv, size); | |
1062 | if (IS_ERR(new_data)) | |
1063 | return PTR_ERR(new_data); | |
8aa9b586 JK |
1064 | change = ue->tlv_data_size != size; |
1065 | if (!change) | |
1066 | change = memcmp(ue->tlv_data, new_data, size); | |
1067 | kfree(ue->tlv_data); | |
1068 | ue->tlv_data = new_data; | |
1069 | ue->tlv_data_size = size; | |
1070 | } else { | |
18c1c3f6 TI |
1071 | if (! ue->tlv_data_size || ! ue->tlv_data) |
1072 | return -ENXIO; | |
8aa9b586 JK |
1073 | if (size < ue->tlv_data_size) |
1074 | return -ENOSPC; | |
1075 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) | |
1076 | return -EFAULT; | |
1077 | } | |
1078 | return change; | |
1079 | } | |
1080 | ||
8d448162 CL |
1081 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
1082 | { | |
1083 | char *names, *p; | |
1084 | size_t buf_len, name_len; | |
1085 | unsigned int i; | |
447c6f93 | 1086 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162 CL |
1087 | |
1088 | if (ue->info.value.enumerated.names_length > 64 * 1024) | |
1089 | return -EINVAL; | |
1090 | ||
447c6f93 | 1091 | names = memdup_user((const void __user *)user_ptrval, |
8d448162 CL |
1092 | ue->info.value.enumerated.names_length); |
1093 | if (IS_ERR(names)) | |
1094 | return PTR_ERR(names); | |
1095 | ||
1096 | /* check that there are enough valid names */ | |
1097 | buf_len = ue->info.value.enumerated.names_length; | |
1098 | p = names; | |
1099 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { | |
1100 | name_len = strnlen(p, buf_len); | |
1101 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { | |
1102 | kfree(names); | |
1103 | return -EINVAL; | |
1104 | } | |
1105 | p += name_len + 1; | |
1106 | buf_len -= name_len + 1; | |
1107 | } | |
1108 | ||
1109 | ue->priv_data = names; | |
1110 | ue->info.value.enumerated.names_ptr = 0; | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
82e9bae6 | 1115 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 1116 | { |
8aa9b586 | 1117 | struct user_element *ue = kcontrol->private_data; |
8d448162 CL |
1118 | |
1119 | kfree(ue->tlv_data); | |
1120 | kfree(ue->priv_data); | |
8aa9b586 | 1121 | kfree(ue); |
1da177e4 LT |
1122 | } |
1123 | ||
82e9bae6 TI |
1124 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
1125 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 1126 | { |
82e9bae6 TI |
1127 | struct snd_card *card = file->card; |
1128 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
1129 | unsigned int access; |
1130 | long private_size; | |
1131 | struct user_element *ue; | |
1132 | int idx, err; | |
983929ca | 1133 | |
08ede038 | 1134 | if (!replace && card->user_ctl_count >= MAX_USER_CONTROLS) |
1da177e4 | 1135 | return -ENOMEM; |
2a031aed | 1136 | if (info->count < 1) |
1da177e4 LT |
1137 | return -EINVAL; |
1138 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 1139 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
1140 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
1141 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
1142 | info->id.numid = 0; |
1143 | memset(&kctl, 0, sizeof(kctl)); | |
1144 | down_write(&card->controls_rwsem); | |
1145 | _kctl = snd_ctl_find_id(card, &info->id); | |
1146 | err = 0; | |
1147 | if (_kctl) { | |
1148 | if (replace) | |
1149 | err = snd_ctl_remove(card, _kctl); | |
1150 | else | |
1151 | err = -EBUSY; | |
1152 | } else { | |
1153 | if (replace) | |
1154 | err = -ENOENT; | |
1155 | } | |
1156 | up_write(&card->controls_rwsem); | |
1157 | if (err < 0) | |
1158 | return err; | |
1159 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
1160 | kctl.count = info->owner ? info->owner : 1; | |
1161 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
8d448162 CL |
1162 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) |
1163 | kctl.info = snd_ctl_elem_user_enum_info; | |
1164 | else | |
1165 | kctl.info = snd_ctl_elem_user_info; | |
1da177e4 LT |
1166 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) |
1167 | kctl.get = snd_ctl_elem_user_get; | |
1168 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
1169 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
1170 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
1171 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
1172 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
1173 | } | |
1da177e4 LT |
1174 | switch (info->type) { |
1175 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
1176 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1177 | private_size = sizeof(long); | |
1178 | if (info->count > 128) | |
1179 | return -EINVAL; | |
1180 | break; | |
1181 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
1182 | private_size = sizeof(long long); | |
1183 | if (info->count > 64) | |
1184 | return -EINVAL; | |
1185 | break; | |
8d448162 CL |
1186 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: |
1187 | private_size = sizeof(unsigned int); | |
1188 | if (info->count > 128 || info->value.enumerated.items == 0) | |
1189 | return -EINVAL; | |
1190 | break; | |
1da177e4 LT |
1191 | case SNDRV_CTL_ELEM_TYPE_BYTES: |
1192 | private_size = sizeof(unsigned char); | |
1193 | if (info->count > 512) | |
1194 | return -EINVAL; | |
1195 | break; | |
1196 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1197 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1198 | if (info->count != 1) |
1199 | return -EINVAL; | |
1200 | break; | |
1201 | default: | |
1202 | return -EINVAL; | |
1203 | } | |
1204 | private_size *= info->count; | |
ca2c0966 | 1205 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1206 | if (ue == NULL) |
1207 | return -ENOMEM; | |
1208 | ue->info = *info; | |
86148e84 | 1209 | ue->info.access = 0; |
1da177e4 LT |
1210 | ue->elem_data = (char *)ue + sizeof(*ue); |
1211 | ue->elem_data_size = private_size; | |
8d448162 CL |
1212 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
1213 | err = snd_ctl_elem_init_enum_names(ue); | |
1214 | if (err < 0) { | |
1215 | kfree(ue); | |
1216 | return err; | |
1217 | } | |
1218 | } | |
1da177e4 LT |
1219 | kctl.private_free = snd_ctl_elem_user_free; |
1220 | _kctl = snd_ctl_new(&kctl, access); | |
1221 | if (_kctl == NULL) { | |
8d448162 | 1222 | kfree(ue->priv_data); |
2fbf182e | 1223 | kfree(ue); |
1da177e4 LT |
1224 | return -ENOMEM; |
1225 | } | |
1226 | _kctl->private_data = ue; | |
1227 | for (idx = 0; idx < _kctl->count; idx++) | |
1228 | _kctl->vd[idx].owner = file; | |
1229 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1230 | if (err < 0) |
1da177e4 | 1231 | return err; |
1da177e4 LT |
1232 | |
1233 | down_write(&card->controls_rwsem); | |
1234 | card->user_ctl_count++; | |
1235 | up_write(&card->controls_rwsem); | |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | ||
82e9bae6 TI |
1240 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1241 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1242 | { |
82e9bae6 | 1243 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1244 | if (copy_from_user(&info, _info, sizeof(info))) |
1245 | return -EFAULT; | |
1246 | return snd_ctl_elem_add(file, &info, replace); | |
1247 | } | |
1248 | ||
82e9bae6 TI |
1249 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1250 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1251 | { |
82e9bae6 | 1252 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1253 | |
1254 | if (copy_from_user(&id, _id, sizeof(id))) | |
1255 | return -EFAULT; | |
f217ac59 | 1256 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1257 | } |
1258 | ||
82e9bae6 | 1259 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1260 | { |
1261 | int subscribe; | |
1262 | if (get_user(subscribe, ptr)) | |
1263 | return -EFAULT; | |
1264 | if (subscribe < 0) { | |
1265 | subscribe = file->subscribed; | |
1266 | if (put_user(subscribe, ptr)) | |
1267 | return -EFAULT; | |
1268 | return 0; | |
1269 | } | |
1270 | if (subscribe) { | |
1271 | file->subscribed = 1; | |
1272 | return 0; | |
1273 | } else if (file->subscribed) { | |
1274 | snd_ctl_empty_read_queue(file); | |
1275 | file->subscribed = 0; | |
1276 | } | |
1277 | return 0; | |
1278 | } | |
1279 | ||
8aa9b586 JK |
1280 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1281 | struct snd_ctl_tlv __user *_tlv, | |
1282 | int op_flag) | |
42750b04 | 1283 | { |
8aa9b586 | 1284 | struct snd_card *card = file->card; |
42750b04 JK |
1285 | struct snd_ctl_tlv tlv; |
1286 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1287 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1288 | unsigned int len; |
1289 | int err = 0; | |
1290 | ||
1291 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1292 | return -EFAULT; | |
6123637f | 1293 | if (tlv.length < sizeof(unsigned int) * 2) |
8aa9b586 JK |
1294 | return -EINVAL; |
1295 | down_read(&card->controls_rwsem); | |
1296 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1297 | if (kctl == NULL) { | |
1298 | err = -ENOENT; | |
1299 | goto __kctl_end; | |
1300 | } | |
1301 | if (kctl->tlv.p == NULL) { | |
1302 | err = -ENXIO; | |
1303 | goto __kctl_end; | |
1304 | } | |
1305 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1306 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1307 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1308 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1309 | err = -ENXIO; | |
1310 | goto __kctl_end; | |
1311 | } | |
1312 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
bec145ae | 1313 | if (vd->owner != NULL && vd->owner != file) { |
8aa9b586 JK |
1314 | err = -EPERM; |
1315 | goto __kctl_end; | |
1316 | } | |
bd483d4c | 1317 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); |
8aa9b586 JK |
1318 | if (err > 0) { |
1319 | up_read(&card->controls_rwsem); | |
1320 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1321 | return 0; | |
1322 | } | |
1323 | } else { | |
1324 | if (op_flag) { | |
1325 | err = -ENXIO; | |
1326 | goto __kctl_end; | |
1327 | } | |
1328 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1329 | if (tlv.length < len) { | |
1330 | err = -ENOMEM; | |
1331 | goto __kctl_end; | |
1332 | } | |
1333 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1334 | err = -EFAULT; | |
1335 | } | |
42750b04 | 1336 | __kctl_end: |
8aa9b586 JK |
1337 | up_read(&card->controls_rwsem); |
1338 | return err; | |
42750b04 JK |
1339 | } |
1340 | ||
1da177e4 LT |
1341 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1342 | { | |
82e9bae6 TI |
1343 | struct snd_ctl_file *ctl; |
1344 | struct snd_card *card; | |
82e9bae6 | 1345 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1346 | void __user *argp = (void __user *)arg; |
1347 | int __user *ip = argp; | |
1348 | int err; | |
1349 | ||
1350 | ctl = file->private_data; | |
1351 | card = ctl->card; | |
7eaa943c TI |
1352 | if (snd_BUG_ON(!card)) |
1353 | return -ENXIO; | |
1da177e4 LT |
1354 | switch (cmd) { |
1355 | case SNDRV_CTL_IOCTL_PVERSION: | |
1356 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1357 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1358 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1359 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1360 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1361 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1362 | return snd_ctl_elem_info_user(ctl, argp); | |
1363 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1364 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1365 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1366 | return snd_ctl_elem_write_user(ctl, argp); | |
1367 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1368 | return snd_ctl_elem_lock(ctl, argp); | |
1369 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1370 | return snd_ctl_elem_unlock(ctl, argp); | |
1371 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1372 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1373 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1374 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1375 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1376 | return snd_ctl_elem_remove(ctl, argp); | |
1377 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1378 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 JK |
1379 | case SNDRV_CTL_IOCTL_TLV_READ: |
1380 | return snd_ctl_tlv_ioctl(ctl, argp, 0); | |
1381 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
1382 | return snd_ctl_tlv_ioctl(ctl, argp, 1); | |
1383 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1384 | return snd_ctl_tlv_ioctl(ctl, argp, -1); | |
1da177e4 | 1385 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1386 | return -ENOPROTOOPT; |
1da177e4 LT |
1387 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1388 | #ifdef CONFIG_PM | |
1389 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1390 | #else | |
1391 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1392 | #endif | |
1393 | } | |
1394 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1395 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1396 | err = p->fioctl(card, ctl, cmd, arg); |
1397 | if (err != -ENOIOCTLCMD) { | |
1398 | up_read(&snd_ioctl_rwsem); | |
1399 | return err; | |
1400 | } | |
1401 | } | |
1402 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1403 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1404 | return -ENOTTY; |
1405 | } | |
1406 | ||
82e9bae6 TI |
1407 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1408 | size_t count, loff_t * offset) | |
1da177e4 | 1409 | { |
82e9bae6 | 1410 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1411 | int err = 0; |
1412 | ssize_t result = 0; | |
1413 | ||
1414 | ctl = file->private_data; | |
7eaa943c TI |
1415 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1416 | return -ENXIO; | |
1da177e4 LT |
1417 | if (!ctl->subscribed) |
1418 | return -EBADFD; | |
82e9bae6 | 1419 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1420 | return -EINVAL; |
1421 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1422 | while (count >= sizeof(struct snd_ctl_event)) { |
1423 | struct snd_ctl_event ev; | |
1424 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1425 | while (list_empty(&ctl->events)) { |
1426 | wait_queue_t wait; | |
1427 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1428 | err = -EAGAIN; | |
1429 | goto __end_lock; | |
1430 | } | |
1431 | init_waitqueue_entry(&wait, current); | |
1432 | add_wait_queue(&ctl->change_sleep, &wait); | |
1433 | set_current_state(TASK_INTERRUPTIBLE); | |
1434 | spin_unlock_irq(&ctl->read_lock); | |
1435 | schedule(); | |
1436 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1437 | if (signal_pending(current)) | |
0e5d720c | 1438 | return -ERESTARTSYS; |
1da177e4 LT |
1439 | spin_lock_irq(&ctl->read_lock); |
1440 | } | |
1441 | kev = snd_kctl_event(ctl->events.next); | |
1442 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1443 | ev.data.elem.mask = kev->mask; | |
1444 | ev.data.elem.id = kev->id; | |
1445 | list_del(&kev->list); | |
1446 | spin_unlock_irq(&ctl->read_lock); | |
1447 | kfree(kev); | |
82e9bae6 | 1448 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1449 | err = -EFAULT; |
1450 | goto __end; | |
1451 | } | |
1452 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1453 | buffer += sizeof(struct snd_ctl_event); |
1454 | count -= sizeof(struct snd_ctl_event); | |
1455 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1456 | } |
1457 | __end_lock: | |
1458 | spin_unlock_irq(&ctl->read_lock); | |
1459 | __end: | |
1460 | return result > 0 ? result : err; | |
1461 | } | |
1462 | ||
1463 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1464 | { | |
1465 | unsigned int mask; | |
82e9bae6 | 1466 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1467 | |
1468 | ctl = file->private_data; | |
1469 | if (!ctl->subscribed) | |
1470 | return 0; | |
1471 | poll_wait(file, &ctl->change_sleep, wait); | |
1472 | ||
1473 | mask = 0; | |
1474 | if (!list_empty(&ctl->events)) | |
1475 | mask |= POLLIN | POLLRDNORM; | |
1476 | ||
1477 | return mask; | |
1478 | } | |
1479 | ||
1480 | /* | |
1481 | * register the device-specific control-ioctls. | |
1482 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1483 | */ | |
1484 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1485 | { | |
82e9bae6 | 1486 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1487 | |
82e9bae6 | 1488 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1489 | if (pn == NULL) |
1490 | return -ENOMEM; | |
1491 | pn->fioctl = fcn; | |
1492 | down_write(&snd_ioctl_rwsem); | |
1493 | list_add_tail(&pn->list, lists); | |
1494 | up_write(&snd_ioctl_rwsem); | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1499 | { | |
1500 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1501 | } | |
1502 | ||
c0d3fb39 TI |
1503 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1504 | ||
1da177e4 LT |
1505 | #ifdef CONFIG_COMPAT |
1506 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1507 | { | |
1508 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1509 | } | |
c0d3fb39 TI |
1510 | |
1511 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1512 | #endif |
1513 | ||
1514 | /* | |
1515 | * de-register the device-specific control-ioctls. | |
1516 | */ | |
82e9bae6 TI |
1517 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1518 | struct list_head *lists) | |
1da177e4 | 1519 | { |
82e9bae6 | 1520 | struct snd_kctl_ioctl *p; |
1da177e4 | 1521 | |
7eaa943c TI |
1522 | if (snd_BUG_ON(!fcn)) |
1523 | return -EINVAL; | |
1da177e4 | 1524 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1525 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1526 | if (p->fioctl == fcn) { |
1527 | list_del(&p->list); | |
1528 | up_write(&snd_ioctl_rwsem); | |
1529 | kfree(p); | |
1530 | return 0; | |
1531 | } | |
1532 | } | |
1533 | up_write(&snd_ioctl_rwsem); | |
1534 | snd_BUG(); | |
1535 | return -EINVAL; | |
1536 | } | |
1537 | ||
1538 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1539 | { | |
1540 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1541 | } | |
1542 | ||
c0d3fb39 TI |
1543 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1544 | ||
1da177e4 LT |
1545 | #ifdef CONFIG_COMPAT |
1546 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1547 | { | |
1548 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1549 | } | |
1550 | ||
c0d3fb39 | 1551 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1552 | #endif |
1553 | ||
1554 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1555 | { | |
82e9bae6 | 1556 | struct snd_ctl_file *ctl; |
60aa4924 | 1557 | |
1da177e4 | 1558 | ctl = file->private_data; |
60aa4924 | 1559 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | /* | |
1563 | * ioctl32 compat | |
1564 | */ | |
1565 | #ifdef CONFIG_COMPAT | |
1566 | #include "control_compat.c" | |
1567 | #else | |
1568 | #define snd_ctl_ioctl_compat NULL | |
1569 | #endif | |
1570 | ||
1571 | /* | |
1572 | * INIT PART | |
1573 | */ | |
1574 | ||
9c2e08c5 | 1575 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1576 | { |
1577 | .owner = THIS_MODULE, | |
1578 | .read = snd_ctl_read, | |
1579 | .open = snd_ctl_open, | |
1580 | .release = snd_ctl_release, | |
02f4865f | 1581 | .llseek = no_llseek, |
1da177e4 LT |
1582 | .poll = snd_ctl_poll, |
1583 | .unlocked_ioctl = snd_ctl_ioctl, | |
1584 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1585 | .fasync = snd_ctl_fasync, | |
1586 | }; | |
1587 | ||
1da177e4 LT |
1588 | /* |
1589 | * registration of the control device | |
1590 | */ | |
82e9bae6 | 1591 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1592 | { |
82e9bae6 | 1593 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1594 | int err, cardnum; |
1595 | char name[16]; | |
1596 | ||
7eaa943c TI |
1597 | if (snd_BUG_ON(!card)) |
1598 | return -ENXIO; | |
1da177e4 | 1599 | cardnum = card->number; |
7eaa943c TI |
1600 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1601 | return -ENXIO; | |
1da177e4 | 1602 | sprintf(name, "controlC%i", cardnum); |
f87135f5 CL |
1603 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1604 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1605 | return err; |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * disconnection of the control device | |
1611 | */ | |
82e9bae6 | 1612 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1613 | { |
82e9bae6 | 1614 | struct snd_card *card = device->device_data; |
82e9bae6 | 1615 | struct snd_ctl_file *ctl; |
c461482c TI |
1616 | int err, cardnum; |
1617 | ||
7eaa943c TI |
1618 | if (snd_BUG_ON(!card)) |
1619 | return -ENXIO; | |
c461482c | 1620 | cardnum = card->number; |
7eaa943c TI |
1621 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1622 | return -ENXIO; | |
1da177e4 | 1623 | |
d8009882 | 1624 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1625 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1626 | wake_up(&ctl->change_sleep); |
1627 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1628 | } | |
d8009882 | 1629 | read_unlock(&card->ctl_files_rwlock); |
c461482c TI |
1630 | |
1631 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1632 | card, -1)) < 0) | |
1633 | return err; | |
1da177e4 LT |
1634 | return 0; |
1635 | } | |
1636 | ||
1637 | /* | |
1638 | * free all controls | |
1639 | */ | |
82e9bae6 | 1640 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1641 | { |
82e9bae6 TI |
1642 | struct snd_card *card = device->device_data; |
1643 | struct snd_kcontrol *control; | |
1da177e4 LT |
1644 | |
1645 | down_write(&card->controls_rwsem); | |
1646 | while (!list_empty(&card->controls)) { | |
1647 | control = snd_kcontrol(card->controls.next); | |
1648 | snd_ctl_remove(card, control); | |
1649 | } | |
1650 | up_write(&card->controls_rwsem); | |
1651 | return 0; | |
1652 | } | |
1653 | ||
1da177e4 LT |
1654 | /* |
1655 | * create control core: | |
1656 | * called from init.c | |
1657 | */ | |
82e9bae6 | 1658 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1659 | { |
82e9bae6 | 1660 | static struct snd_device_ops ops = { |
1da177e4 LT |
1661 | .dev_free = snd_ctl_dev_free, |
1662 | .dev_register = snd_ctl_dev_register, | |
1663 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1664 | }; |
1665 | ||
7eaa943c TI |
1666 | if (snd_BUG_ON(!card)) |
1667 | return -ENXIO; | |
1da177e4 LT |
1668 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); |
1669 | } | |
b9ed4f2b TI |
1670 | |
1671 | /* | |
9600732b | 1672 | * Frequently used control callbacks/helpers |
b9ed4f2b TI |
1673 | */ |
1674 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
1675 | struct snd_ctl_elem_info *uinfo) | |
1676 | { | |
1677 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1678 | uinfo->count = 1; | |
1679 | uinfo->value.integer.min = 0; | |
1680 | uinfo->value.integer.max = 1; | |
1681 | return 0; | |
1682 | } | |
1683 | ||
1684 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); | |
1685 | ||
1686 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
1687 | struct snd_ctl_elem_info *uinfo) | |
1688 | { | |
1689 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1690 | uinfo->count = 2; | |
1691 | uinfo->value.integer.min = 0; | |
1692 | uinfo->value.integer.max = 1; | |
1693 | return 0; | |
1694 | } | |
1695 | ||
1696 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); | |
9600732b CL |
1697 | |
1698 | /** | |
1699 | * snd_ctl_enum_info - fills the info structure for an enumerated control | |
1700 | * @info: the structure to be filled | |
1701 | * @channels: the number of the control's channels; often one | |
1702 | * @items: the number of control values; also the size of @names | |
1703 | * @names: an array containing the names of all control values | |
1704 | * | |
1705 | * Sets all required fields in @info to their appropriate values. | |
1706 | * If the control's accessibility is not the default (readable and writable), | |
1707 | * the caller has to fill @info->access. | |
1708 | */ | |
1709 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, | |
1710 | unsigned int items, const char *const names[]) | |
1711 | { | |
1712 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; | |
1713 | info->count = channels; | |
1714 | info->value.enumerated.items = items; | |
1715 | if (info->value.enumerated.item >= items) | |
1716 | info->value.enumerated.item = items - 1; | |
1717 | strlcpy(info->value.enumerated.name, | |
1718 | names[info->value.enumerated.item], | |
1719 | sizeof(info->value.enumerated.name)); | |
1720 | return 0; | |
1721 | } | |
1722 | EXPORT_SYMBOL(snd_ctl_enum_info); |