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