Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Routines for driver control interface | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
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 | ||
22 | #include <sound/driver.h> | |
23 | #include <linux/threads.h> | |
24 | #include <linux/interrupt.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 | |
35 | ||
82e9bae6 | 36 | struct snd_kctl_ioctl { |
1da177e4 LT |
37 | struct list_head list; /* list of all ioctls */ |
38 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 39 | }; |
1da177e4 LT |
40 | |
41 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
42 | static LIST_HEAD(snd_control_ioctls); | |
43 | #ifdef CONFIG_COMPAT | |
44 | static LIST_HEAD(snd_control_compat_ioctls); | |
45 | #endif | |
46 | ||
47 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
48 | { | |
1da177e4 | 49 | unsigned long flags; |
82e9bae6 TI |
50 | struct snd_card *card; |
51 | struct snd_ctl_file *ctl; | |
1da177e4 LT |
52 | int err; |
53 | ||
f87135f5 | 54 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
55 | if (!card) { |
56 | err = -ENODEV; | |
57 | goto __error1; | |
58 | } | |
59 | err = snd_card_file_add(card, file); | |
60 | if (err < 0) { | |
61 | err = -ENODEV; | |
62 | goto __error1; | |
63 | } | |
64 | if (!try_module_get(card->module)) { | |
65 | err = -EFAULT; | |
66 | goto __error2; | |
67 | } | |
ca2c0966 | 68 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
69 | if (ctl == NULL) { |
70 | err = -ENOMEM; | |
71 | goto __error; | |
72 | } | |
73 | INIT_LIST_HEAD(&ctl->events); | |
74 | init_waitqueue_head(&ctl->change_sleep); | |
75 | spin_lock_init(&ctl->read_lock); | |
76 | ctl->card = card; | |
2529bba7 TI |
77 | ctl->prefer_pcm_subdevice = -1; |
78 | ctl->prefer_rawmidi_subdevice = -1; | |
1da177e4 LT |
79 | ctl->pid = current->pid; |
80 | file->private_data = ctl; | |
81 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
82 | list_add_tail(&ctl->list, &card->ctl_files); | |
83 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
84 | return 0; | |
85 | ||
86 | __error: | |
87 | module_put(card->module); | |
88 | __error2: | |
89 | snd_card_file_remove(card, file); | |
90 | __error1: | |
91 | return err; | |
92 | } | |
93 | ||
82e9bae6 | 94 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 95 | { |
82e9bae6 | 96 | struct snd_kctl_event *cread; |
1da177e4 LT |
97 | |
98 | spin_lock(&ctl->read_lock); | |
99 | while (!list_empty(&ctl->events)) { | |
100 | cread = snd_kctl_event(ctl->events.next); | |
101 | list_del(&cread->list); | |
102 | kfree(cread); | |
103 | } | |
104 | spin_unlock(&ctl->read_lock); | |
105 | } | |
106 | ||
107 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
108 | { | |
109 | unsigned long flags; | |
82e9bae6 TI |
110 | struct snd_card *card; |
111 | struct snd_ctl_file *ctl; | |
112 | struct snd_kcontrol *control; | |
1da177e4 LT |
113 | unsigned int idx; |
114 | ||
115 | ctl = file->private_data; | |
116 | fasync_helper(-1, file, 0, &ctl->fasync); | |
117 | file->private_data = NULL; | |
118 | card = ctl->card; | |
119 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
120 | list_del(&ctl->list); | |
121 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
122 | down_write(&card->controls_rwsem); | |
9244b2c3 | 123 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
124 | for (idx = 0; idx < control->count; idx++) |
125 | if (control->vd[idx].owner == ctl) | |
126 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
127 | up_write(&card->controls_rwsem); |
128 | snd_ctl_empty_read_queue(ctl); | |
129 | kfree(ctl); | |
130 | module_put(card->module); | |
131 | snd_card_file_remove(card, file); | |
132 | return 0; | |
133 | } | |
134 | ||
82e9bae6 TI |
135 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
136 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
137 | { |
138 | unsigned long flags; | |
82e9bae6 TI |
139 | struct snd_ctl_file *ctl; |
140 | struct snd_kctl_event *ev; | |
1da177e4 | 141 | |
7c22f1aa | 142 | snd_assert(card != NULL && id != NULL, return); |
1da177e4 LT |
143 | read_lock(&card->ctl_files_rwlock); |
144 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
145 | card->mixer_oss_change_count++; | |
146 | #endif | |
9244b2c3 | 147 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
148 | if (!ctl->subscribed) |
149 | continue; | |
150 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 151 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
152 | if (ev->id.numid == id->numid) { |
153 | ev->mask |= mask; | |
154 | goto _found; | |
155 | } | |
156 | } | |
ca2c0966 | 157 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
158 | if (ev) { |
159 | ev->id = *id; | |
160 | ev->mask = mask; | |
161 | list_add_tail(&ev->list, &ctl->events); | |
162 | } else { | |
163 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
164 | } | |
165 | _found: | |
166 | wake_up(&ctl->change_sleep); | |
167 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
168 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
169 | } | |
170 | read_unlock(&card->ctl_files_rwlock); | |
171 | } | |
172 | ||
c0d3fb39 TI |
173 | EXPORT_SYMBOL(snd_ctl_notify); |
174 | ||
1da177e4 LT |
175 | /** |
176 | * snd_ctl_new - create a control instance from the template | |
177 | * @control: the control template | |
178 | * @access: the default control access | |
179 | * | |
82e9bae6 | 180 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
181 | * to the new instance. It does not copy volatile data (access). |
182 | * | |
183 | * Returns the pointer of the new instance, or NULL on failure. | |
184 | */ | |
0b51ba07 AB |
185 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
186 | unsigned int access) | |
1da177e4 | 187 | { |
82e9bae6 | 188 | struct snd_kcontrol *kctl; |
1da177e4 LT |
189 | unsigned int idx; |
190 | ||
7c22f1aa TI |
191 | snd_assert(control != NULL, return NULL); |
192 | snd_assert(control->count > 0, return NULL); | |
82e9bae6 | 193 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 TI |
194 | if (kctl == NULL) { |
195 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); | |
1da177e4 | 196 | return NULL; |
73e77ba0 | 197 | } |
1da177e4 LT |
198 | *kctl = *control; |
199 | for (idx = 0; idx < kctl->count; idx++) | |
200 | kctl->vd[idx].access = access; | |
201 | return kctl; | |
202 | } | |
203 | ||
204 | /** | |
205 | * snd_ctl_new1 - create a control instance from the template | |
206 | * @ncontrol: the initialization record | |
207 | * @private_data: the private data to set | |
208 | * | |
82e9bae6 | 209 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
210 | * template. When the access field of ncontrol is 0, it's assumed as |
211 | * READWRITE access. When the count field is 0, it's assumes as one. | |
212 | * | |
213 | * Returns the pointer of the newly generated instance, or NULL on failure. | |
214 | */ | |
82e9bae6 TI |
215 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
216 | void *private_data) | |
1da177e4 | 217 | { |
82e9bae6 | 218 | struct snd_kcontrol kctl; |
1da177e4 LT |
219 | unsigned int access; |
220 | ||
7c22f1aa | 221 | snd_assert(ncontrol != NULL, return NULL); |
1da177e4 LT |
222 | snd_assert(ncontrol->info != NULL, return NULL); |
223 | memset(&kctl, 0, sizeof(kctl)); | |
224 | kctl.id.iface = ncontrol->iface; | |
225 | kctl.id.device = ncontrol->device; | |
226 | kctl.id.subdevice = ncontrol->subdevice; | |
227 | if (ncontrol->name) | |
228 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); | |
229 | kctl.id.index = ncontrol->index; | |
230 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
231 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 JK |
232 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
233 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| | |
234 | SNDRV_CTL_ELEM_ACCESS_DINDIRECT| | |
235 | SNDRV_CTL_ELEM_ACCESS_INDIRECT| | |
236 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| | |
237 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
238 | kctl.info = ncontrol->info; |
239 | kctl.get = ncontrol->get; | |
240 | kctl.put = ncontrol->put; | |
8aa9b586 | 241 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
242 | kctl.private_value = ncontrol->private_value; |
243 | kctl.private_data = private_data; | |
244 | return snd_ctl_new(&kctl, access); | |
245 | } | |
246 | ||
c0d3fb39 TI |
247 | EXPORT_SYMBOL(snd_ctl_new1); |
248 | ||
1da177e4 LT |
249 | /** |
250 | * snd_ctl_free_one - release the control instance | |
251 | * @kcontrol: the control instance | |
252 | * | |
253 | * Releases the control instance created via snd_ctl_new() | |
254 | * or snd_ctl_new1(). | |
255 | * Don't call this after the control was added to the card. | |
256 | */ | |
82e9bae6 | 257 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
258 | { |
259 | if (kcontrol) { | |
260 | if (kcontrol->private_free) | |
261 | kcontrol->private_free(kcontrol); | |
262 | kfree(kcontrol); | |
263 | } | |
264 | } | |
265 | ||
c0d3fb39 TI |
266 | EXPORT_SYMBOL(snd_ctl_free_one); |
267 | ||
82e9bae6 | 268 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
1da177e4 LT |
269 | unsigned int count) |
270 | { | |
82e9bae6 | 271 | struct snd_kcontrol *kctl; |
1da177e4 | 272 | |
9244b2c3 | 273 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
274 | if ((kctl->id.numid <= card->last_numid && |
275 | kctl->id.numid + kctl->count > card->last_numid) || | |
276 | (kctl->id.numid <= card->last_numid + count - 1 && | |
277 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) | |
278 | return card->last_numid = kctl->id.numid + kctl->count - 1; | |
279 | } | |
280 | return card->last_numid; | |
281 | } | |
282 | ||
82e9bae6 | 283 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 LT |
284 | { |
285 | unsigned int last_numid, iter = 100000; | |
286 | ||
287 | last_numid = card->last_numid; | |
288 | while (last_numid != snd_ctl_hole_check(card, count)) { | |
289 | if (--iter == 0) { | |
290 | /* this situation is very unlikely */ | |
291 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
292 | return -ENOMEM; | |
293 | } | |
294 | last_numid = card->last_numid; | |
295 | } | |
296 | return 0; | |
297 | } | |
298 | ||
299 | /** | |
300 | * snd_ctl_add - add the control instance to the card | |
301 | * @card: the card instance | |
302 | * @kcontrol: the control instance to add | |
303 | * | |
304 | * Adds the control instance created via snd_ctl_new() or | |
305 | * snd_ctl_new1() to the given card. Assigns also an unique | |
306 | * numid used for fast search. | |
307 | * | |
308 | * Returns zero if successful, or a negative error code on failure. | |
309 | * | |
310 | * It frees automatically the control which cannot be added. | |
311 | */ | |
82e9bae6 | 312 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 313 | { |
82e9bae6 | 314 | struct snd_ctl_elem_id id; |
1da177e4 | 315 | unsigned int idx; |
c6077b30 | 316 | int err = -EINVAL; |
1da177e4 | 317 | |
73e77ba0 | 318 | if (! kcontrol) |
c6077b30 TI |
319 | return err; |
320 | snd_assert(card != NULL, goto error); | |
321 | snd_assert(kcontrol->info != NULL, goto error); | |
1da177e4 LT |
322 | id = kcontrol->id; |
323 | down_write(&card->controls_rwsem); | |
324 | if (snd_ctl_find_id(card, &id)) { | |
325 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
326 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
327 | id.iface, | |
328 | id.device, | |
329 | id.subdevice, | |
330 | id.name, | |
331 | id.index); | |
c6077b30 TI |
332 | err = -EBUSY; |
333 | goto error; | |
1da177e4 LT |
334 | } |
335 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
336 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
337 | err = -ENOMEM; |
338 | goto error; | |
1da177e4 LT |
339 | } |
340 | list_add_tail(&kcontrol->list, &card->controls); | |
341 | card->controls_count += kcontrol->count; | |
342 | kcontrol->id.numid = card->last_numid + 1; | |
343 | card->last_numid += kcontrol->count; | |
344 | up_write(&card->controls_rwsem); | |
345 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
346 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
347 | return 0; | |
c6077b30 TI |
348 | |
349 | error: | |
350 | snd_ctl_free_one(kcontrol); | |
351 | return err; | |
1da177e4 LT |
352 | } |
353 | ||
c0d3fb39 TI |
354 | EXPORT_SYMBOL(snd_ctl_add); |
355 | ||
1da177e4 LT |
356 | /** |
357 | * snd_ctl_remove - remove the control from the card and release it | |
358 | * @card: the card instance | |
359 | * @kcontrol: the control instance to remove | |
360 | * | |
361 | * Removes the control from the card and then releases the instance. | |
362 | * You don't need to call snd_ctl_free_one(). You must be in | |
363 | * the write lock - down_write(&card->controls_rwsem). | |
364 | * | |
365 | * Returns 0 if successful, or a negative error code on failure. | |
366 | */ | |
82e9bae6 | 367 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 368 | { |
82e9bae6 | 369 | struct snd_ctl_elem_id id; |
1da177e4 LT |
370 | unsigned int idx; |
371 | ||
7c22f1aa | 372 | snd_assert(card != NULL && kcontrol != NULL, return -EINVAL); |
1da177e4 LT |
373 | list_del(&kcontrol->list); |
374 | card->controls_count -= kcontrol->count; | |
375 | id = kcontrol->id; | |
376 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
377 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
378 | snd_ctl_free_one(kcontrol); | |
379 | return 0; | |
380 | } | |
381 | ||
c0d3fb39 TI |
382 | EXPORT_SYMBOL(snd_ctl_remove); |
383 | ||
1da177e4 LT |
384 | /** |
385 | * snd_ctl_remove_id - remove the control of the given id and release it | |
386 | * @card: the card instance | |
387 | * @id: the control id to remove | |
388 | * | |
389 | * Finds the control instance with the given id, removes it from the | |
390 | * card list and releases it. | |
391 | * | |
392 | * Returns 0 if successful, or a negative error code on failure. | |
393 | */ | |
82e9bae6 | 394 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 395 | { |
82e9bae6 | 396 | struct snd_kcontrol *kctl; |
1da177e4 LT |
397 | int ret; |
398 | ||
399 | down_write(&card->controls_rwsem); | |
400 | kctl = snd_ctl_find_id(card, id); | |
401 | if (kctl == NULL) { | |
402 | up_write(&card->controls_rwsem); | |
403 | return -ENOENT; | |
404 | } | |
405 | ret = snd_ctl_remove(card, kctl); | |
406 | up_write(&card->controls_rwsem); | |
407 | return ret; | |
408 | } | |
409 | ||
c0d3fb39 TI |
410 | EXPORT_SYMBOL(snd_ctl_remove_id); |
411 | ||
1da177e4 LT |
412 | /** |
413 | * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it | |
414 | * @file: active control handle | |
415 | * @id: the control id to remove | |
416 | * | |
417 | * Finds the control instance with the given id, removes it from the | |
418 | * card list and releases it. | |
419 | * | |
420 | * Returns 0 if successful, or a negative error code on failure. | |
421 | */ | |
82e9bae6 TI |
422 | static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file, |
423 | struct snd_ctl_elem_id *id) | |
1da177e4 | 424 | { |
82e9bae6 TI |
425 | struct snd_card *card = file->card; |
426 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
427 | int idx, ret; |
428 | ||
429 | down_write(&card->controls_rwsem); | |
430 | kctl = snd_ctl_find_id(card, id); | |
431 | if (kctl == NULL) { | |
432 | up_write(&card->controls_rwsem); | |
433 | return -ENOENT; | |
434 | } | |
435 | for (idx = 0; idx < kctl->count; idx++) | |
436 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
437 | up_write(&card->controls_rwsem); | |
438 | return -EBUSY; | |
439 | } | |
440 | ret = snd_ctl_remove(card, kctl); | |
441 | up_write(&card->controls_rwsem); | |
442 | return ret; | |
443 | } | |
444 | ||
445 | /** | |
446 | * snd_ctl_rename_id - replace the id of a control on the card | |
447 | * @card: the card instance | |
448 | * @src_id: the old id | |
449 | * @dst_id: the new id | |
450 | * | |
451 | * Finds the control with the old id from the card, and replaces the | |
452 | * id with the new one. | |
453 | * | |
454 | * Returns zero if successful, or a negative error code on failure. | |
455 | */ | |
82e9bae6 TI |
456 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
457 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 458 | { |
82e9bae6 | 459 | struct snd_kcontrol *kctl; |
1da177e4 LT |
460 | |
461 | down_write(&card->controls_rwsem); | |
462 | kctl = snd_ctl_find_id(card, src_id); | |
463 | if (kctl == NULL) { | |
464 | up_write(&card->controls_rwsem); | |
465 | return -ENOENT; | |
466 | } | |
467 | kctl->id = *dst_id; | |
468 | kctl->id.numid = card->last_numid + 1; | |
469 | card->last_numid += kctl->count; | |
470 | up_write(&card->controls_rwsem); | |
471 | return 0; | |
472 | } | |
473 | ||
c0d3fb39 TI |
474 | EXPORT_SYMBOL(snd_ctl_rename_id); |
475 | ||
1da177e4 LT |
476 | /** |
477 | * snd_ctl_find_numid - find the control instance with the given number-id | |
478 | * @card: the card instance | |
479 | * @numid: the number-id to search | |
480 | * | |
481 | * Finds the control instance with the given number-id from the card. | |
482 | * | |
483 | * Returns the pointer of the instance if found, or NULL if not. | |
484 | * | |
485 | * The caller must down card->controls_rwsem before calling this function | |
486 | * (if the race condition can happen). | |
487 | */ | |
82e9bae6 | 488 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 489 | { |
82e9bae6 | 490 | struct snd_kcontrol *kctl; |
1da177e4 | 491 | |
7c22f1aa | 492 | snd_assert(card != NULL && numid != 0, return NULL); |
9244b2c3 | 493 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
494 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
495 | return kctl; | |
496 | } | |
497 | return NULL; | |
498 | } | |
499 | ||
c0d3fb39 TI |
500 | EXPORT_SYMBOL(snd_ctl_find_numid); |
501 | ||
1da177e4 LT |
502 | /** |
503 | * snd_ctl_find_id - find the control instance with the given id | |
504 | * @card: the card instance | |
505 | * @id: the id to search | |
506 | * | |
507 | * Finds the control instance with the given id from the card. | |
508 | * | |
509 | * Returns the pointer of the instance if found, or NULL if not. | |
510 | * | |
511 | * The caller must down card->controls_rwsem before calling this function | |
512 | * (if the race condition can happen). | |
513 | */ | |
82e9bae6 TI |
514 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
515 | struct snd_ctl_elem_id *id) | |
1da177e4 | 516 | { |
82e9bae6 | 517 | struct snd_kcontrol *kctl; |
1da177e4 | 518 | |
7c22f1aa | 519 | snd_assert(card != NULL && id != NULL, return NULL); |
1da177e4 LT |
520 | if (id->numid != 0) |
521 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 522 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
523 | if (kctl->id.iface != id->iface) |
524 | continue; | |
525 | if (kctl->id.device != id->device) | |
526 | continue; | |
527 | if (kctl->id.subdevice != id->subdevice) | |
528 | continue; | |
529 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
530 | continue; | |
531 | if (kctl->id.index > id->index) | |
532 | continue; | |
533 | if (kctl->id.index + kctl->count <= id->index) | |
534 | continue; | |
535 | return kctl; | |
536 | } | |
537 | return NULL; | |
538 | } | |
539 | ||
c0d3fb39 TI |
540 | EXPORT_SYMBOL(snd_ctl_find_id); |
541 | ||
82e9bae6 | 542 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
543 | unsigned int cmd, void __user *arg) |
544 | { | |
82e9bae6 | 545 | struct snd_ctl_card_info *info; |
1da177e4 | 546 | |
ca2c0966 | 547 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
548 | if (! info) |
549 | return -ENOMEM; | |
550 | down_read(&snd_ioctl_rwsem); | |
551 | info->card = card->number; | |
552 | strlcpy(info->id, card->id, sizeof(info->id)); | |
553 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
554 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
555 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
556 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
557 | strlcpy(info->components, card->components, sizeof(info->components)); | |
558 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 559 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
560 | kfree(info); |
561 | return -EFAULT; | |
562 | } | |
563 | kfree(info); | |
564 | return 0; | |
565 | } | |
566 | ||
82e9bae6 TI |
567 | static int snd_ctl_elem_list(struct snd_card *card, |
568 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
569 | { |
570 | struct list_head *plist; | |
82e9bae6 TI |
571 | struct snd_ctl_elem_list list; |
572 | struct snd_kcontrol *kctl; | |
573 | struct snd_ctl_elem_id *dst, *id; | |
1da177e4 LT |
574 | unsigned int offset, space, first, jidx; |
575 | ||
576 | if (copy_from_user(&list, _list, sizeof(list))) | |
577 | return -EFAULT; | |
578 | offset = list.offset; | |
579 | space = list.space; | |
580 | first = 0; | |
581 | /* try limit maximum space */ | |
582 | if (space > 16384) | |
583 | return -ENOMEM; | |
584 | if (space > 0) { | |
585 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 586 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
587 | if (dst == NULL) |
588 | return -ENOMEM; | |
589 | down_read(&card->controls_rwsem); | |
590 | list.count = card->controls_count; | |
591 | plist = card->controls.next; | |
592 | while (plist != &card->controls) { | |
593 | if (offset == 0) | |
594 | break; | |
595 | kctl = snd_kcontrol(plist); | |
596 | if (offset < kctl->count) | |
597 | break; | |
598 | offset -= kctl->count; | |
599 | plist = plist->next; | |
600 | } | |
601 | list.used = 0; | |
602 | id = dst; | |
603 | while (space > 0 && plist != &card->controls) { | |
604 | kctl = snd_kcontrol(plist); | |
605 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
606 | snd_ctl_build_ioff(id, kctl, jidx); | |
607 | id++; | |
608 | space--; | |
609 | list.used++; | |
610 | } | |
611 | plist = plist->next; | |
612 | offset = 0; | |
613 | } | |
614 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
615 | if (list.used > 0 && |
616 | copy_to_user(list.pids, dst, | |
617 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
618 | vfree(dst); |
619 | return -EFAULT; | |
620 | } | |
621 | vfree(dst); | |
622 | } else { | |
623 | down_read(&card->controls_rwsem); | |
624 | list.count = card->controls_count; | |
625 | up_read(&card->controls_rwsem); | |
626 | } | |
627 | if (copy_to_user(_list, &list, sizeof(list))) | |
628 | return -EFAULT; | |
629 | return 0; | |
630 | } | |
631 | ||
82e9bae6 TI |
632 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
633 | struct snd_ctl_elem_info *info) | |
1da177e4 | 634 | { |
82e9bae6 TI |
635 | struct snd_card *card = ctl->card; |
636 | struct snd_kcontrol *kctl; | |
637 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
638 | unsigned int index_offset; |
639 | int result; | |
640 | ||
641 | down_read(&card->controls_rwsem); | |
642 | kctl = snd_ctl_find_id(card, &info->id); | |
643 | if (kctl == NULL) { | |
644 | up_read(&card->controls_rwsem); | |
645 | return -ENOENT; | |
646 | } | |
647 | #ifdef CONFIG_SND_DEBUG | |
648 | info->access = 0; | |
649 | #endif | |
650 | result = kctl->info(kctl, info); | |
651 | if (result >= 0) { | |
652 | snd_assert(info->access == 0, ); | |
653 | index_offset = snd_ctl_get_ioff(kctl, &info->id); | |
654 | vd = &kctl->vd[index_offset]; | |
655 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
656 | info->access = vd->access; | |
657 | if (vd->owner) { | |
658 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
659 | if (vd->owner == ctl) | |
660 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
661 | info->owner = vd->owner_pid; | |
662 | } else { | |
663 | info->owner = -1; | |
664 | } | |
665 | } | |
666 | up_read(&card->controls_rwsem); | |
667 | return result; | |
668 | } | |
669 | ||
82e9bae6 TI |
670 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
671 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 672 | { |
82e9bae6 | 673 | struct snd_ctl_elem_info info; |
1da177e4 LT |
674 | int result; |
675 | ||
676 | if (copy_from_user(&info, _info, sizeof(info))) | |
677 | return -EFAULT; | |
64649400 | 678 | snd_power_lock(ctl->card); |
cbac4b0c | 679 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
680 | if (result >= 0) |
681 | result = snd_ctl_elem_info(ctl, &info); | |
682 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
683 | if (result >= 0) |
684 | if (copy_to_user(_info, &info, sizeof(info))) | |
685 | return -EFAULT; | |
686 | return result; | |
687 | } | |
688 | ||
82e9bae6 | 689 | int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control) |
1da177e4 | 690 | { |
82e9bae6 TI |
691 | struct snd_kcontrol *kctl; |
692 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
693 | unsigned int index_offset; |
694 | int result, indirect; | |
695 | ||
696 | down_read(&card->controls_rwsem); | |
697 | kctl = snd_ctl_find_id(card, &control->id); | |
698 | if (kctl == NULL) { | |
699 | result = -ENOENT; | |
700 | } else { | |
701 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
702 | vd = &kctl->vd[index_offset]; | |
703 | indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0; | |
704 | if (control->indirect != indirect) { | |
705 | result = -EACCES; | |
706 | } else { | |
707 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get != NULL) { | |
708 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
709 | result = kctl->get(kctl, control); | |
710 | } else { | |
711 | result = -EPERM; | |
712 | } | |
713 | } | |
714 | } | |
715 | up_read(&card->controls_rwsem); | |
716 | return result; | |
717 | } | |
718 | ||
c0d3fb39 TI |
719 | EXPORT_SYMBOL(snd_ctl_elem_read); |
720 | ||
82e9bae6 TI |
721 | static int snd_ctl_elem_read_user(struct snd_card *card, |
722 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 723 | { |
82e9bae6 | 724 | struct snd_ctl_elem_value *control; |
1da177e4 LT |
725 | int result; |
726 | ||
727 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
728 | if (control == NULL) | |
729 | return -ENOMEM; | |
730 | if (copy_from_user(control, _control, sizeof(*control))) { | |
731 | kfree(control); | |
732 | return -EFAULT; | |
733 | } | |
64649400 | 734 | snd_power_lock(card); |
cbac4b0c | 735 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
736 | if (result >= 0) |
737 | result = snd_ctl_elem_read(card, control); | |
738 | snd_power_unlock(card); | |
1da177e4 LT |
739 | if (result >= 0) |
740 | if (copy_to_user(_control, control, sizeof(*control))) | |
741 | result = -EFAULT; | |
742 | kfree(control); | |
743 | return result; | |
744 | } | |
745 | ||
82e9bae6 TI |
746 | int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
747 | struct snd_ctl_elem_value *control) | |
1da177e4 | 748 | { |
82e9bae6 TI |
749 | struct snd_kcontrol *kctl; |
750 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
751 | unsigned int index_offset; |
752 | int result, indirect; | |
753 | ||
754 | down_read(&card->controls_rwsem); | |
755 | kctl = snd_ctl_find_id(card, &control->id); | |
756 | if (kctl == NULL) { | |
757 | result = -ENOENT; | |
758 | } else { | |
759 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
760 | vd = &kctl->vd[index_offset]; | |
761 | indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0; | |
762 | if (control->indirect != indirect) { | |
763 | result = -EACCES; | |
764 | } else { | |
765 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || | |
766 | kctl->put == NULL || | |
767 | (file && vd->owner != NULL && vd->owner != file)) { | |
768 | result = -EPERM; | |
769 | } else { | |
770 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
771 | result = kctl->put(kctl, control); | |
772 | } | |
773 | if (result > 0) { | |
774 | up_read(&card->controls_rwsem); | |
775 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &control->id); | |
776 | return 0; | |
777 | } | |
778 | } | |
779 | } | |
780 | up_read(&card->controls_rwsem); | |
781 | return result; | |
782 | } | |
783 | ||
c0d3fb39 TI |
784 | EXPORT_SYMBOL(snd_ctl_elem_write); |
785 | ||
82e9bae6 TI |
786 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
787 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 788 | { |
82e9bae6 | 789 | struct snd_ctl_elem_value *control; |
64649400 | 790 | struct snd_card *card; |
1da177e4 LT |
791 | int result; |
792 | ||
793 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
794 | if (control == NULL) | |
795 | return -ENOMEM; | |
796 | if (copy_from_user(control, _control, sizeof(*control))) { | |
797 | kfree(control); | |
798 | return -EFAULT; | |
799 | } | |
64649400 GP |
800 | card = file->card; |
801 | snd_power_lock(card); | |
cbac4b0c | 802 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
803 | if (result >= 0) |
804 | result = snd_ctl_elem_write(card, file, control); | |
805 | snd_power_unlock(card); | |
1da177e4 LT |
806 | if (result >= 0) |
807 | if (copy_to_user(_control, control, sizeof(*control))) | |
808 | result = -EFAULT; | |
809 | kfree(control); | |
810 | return result; | |
811 | } | |
812 | ||
82e9bae6 TI |
813 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
814 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 815 | { |
82e9bae6 TI |
816 | struct snd_card *card = file->card; |
817 | struct snd_ctl_elem_id id; | |
818 | struct snd_kcontrol *kctl; | |
819 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
820 | int result; |
821 | ||
822 | if (copy_from_user(&id, _id, sizeof(id))) | |
823 | return -EFAULT; | |
824 | down_write(&card->controls_rwsem); | |
825 | kctl = snd_ctl_find_id(card, &id); | |
826 | if (kctl == NULL) { | |
827 | result = -ENOENT; | |
828 | } else { | |
829 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
830 | if (vd->owner != NULL) | |
831 | result = -EBUSY; | |
832 | else { | |
833 | vd->owner = file; | |
834 | vd->owner_pid = current->pid; | |
835 | result = 0; | |
836 | } | |
837 | } | |
838 | up_write(&card->controls_rwsem); | |
839 | return result; | |
840 | } | |
841 | ||
82e9bae6 TI |
842 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
843 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 844 | { |
82e9bae6 TI |
845 | struct snd_card *card = file->card; |
846 | struct snd_ctl_elem_id id; | |
847 | struct snd_kcontrol *kctl; | |
848 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
849 | int result; |
850 | ||
851 | if (copy_from_user(&id, _id, sizeof(id))) | |
852 | return -EFAULT; | |
853 | down_write(&card->controls_rwsem); | |
854 | kctl = snd_ctl_find_id(card, &id); | |
855 | if (kctl == NULL) { | |
856 | result = -ENOENT; | |
857 | } else { | |
858 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
859 | if (vd->owner == NULL) | |
860 | result = -EINVAL; | |
861 | else if (vd->owner != file) | |
862 | result = -EPERM; | |
863 | else { | |
864 | vd->owner = NULL; | |
865 | vd->owner_pid = 0; | |
866 | result = 0; | |
867 | } | |
868 | } | |
869 | up_write(&card->controls_rwsem); | |
870 | return result; | |
871 | } | |
872 | ||
873 | struct user_element { | |
82e9bae6 | 874 | struct snd_ctl_elem_info info; |
1da177e4 LT |
875 | void *elem_data; /* element data */ |
876 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
877 | void *tlv_data; /* TLV data */ |
878 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 LT |
879 | void *priv_data; /* private data (like strings for enumerated type) */ |
880 | unsigned long priv_data_size; /* size of private data in bytes */ | |
881 | }; | |
882 | ||
82e9bae6 TI |
883 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
884 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
885 | { |
886 | struct user_element *ue = kcontrol->private_data; | |
887 | ||
888 | *uinfo = ue->info; | |
889 | return 0; | |
890 | } | |
891 | ||
82e9bae6 TI |
892 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
893 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
894 | { |
895 | struct user_element *ue = kcontrol->private_data; | |
896 | ||
897 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
898 | return 0; | |
899 | } | |
900 | ||
82e9bae6 TI |
901 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
902 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
903 | { |
904 | int change; | |
905 | struct user_element *ue = kcontrol->private_data; | |
906 | ||
907 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
908 | if (change) | |
909 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
910 | return change; | |
911 | } | |
912 | ||
8aa9b586 JK |
913 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
914 | int op_flag, | |
915 | unsigned int size, | |
916 | unsigned int __user *tlv) | |
917 | { | |
918 | struct user_element *ue = kcontrol->private_data; | |
919 | int change = 0; | |
920 | void *new_data; | |
921 | ||
922 | if (op_flag > 0) { | |
923 | if (size > 1024 * 128) /* sane value */ | |
924 | return -EINVAL; | |
925 | new_data = kmalloc(size, GFP_KERNEL); | |
926 | if (new_data == NULL) | |
927 | return -ENOMEM; | |
928 | if (copy_from_user(new_data, tlv, size)) { | |
929 | kfree(new_data); | |
930 | return -EFAULT; | |
931 | } | |
932 | change = ue->tlv_data_size != size; | |
933 | if (!change) | |
934 | change = memcmp(ue->tlv_data, new_data, size); | |
935 | kfree(ue->tlv_data); | |
936 | ue->tlv_data = new_data; | |
937 | ue->tlv_data_size = size; | |
938 | } else { | |
18c1c3f6 TI |
939 | if (! ue->tlv_data_size || ! ue->tlv_data) |
940 | return -ENXIO; | |
8aa9b586 JK |
941 | if (size < ue->tlv_data_size) |
942 | return -ENOSPC; | |
943 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) | |
944 | return -EFAULT; | |
945 | } | |
946 | return change; | |
947 | } | |
948 | ||
82e9bae6 | 949 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 950 | { |
8aa9b586 JK |
951 | struct user_element *ue = kcontrol->private_data; |
952 | if (ue->tlv_data) | |
953 | kfree(ue->tlv_data); | |
954 | kfree(ue); | |
1da177e4 LT |
955 | } |
956 | ||
82e9bae6 TI |
957 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
958 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 959 | { |
82e9bae6 TI |
960 | struct snd_card *card = file->card; |
961 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
962 | unsigned int access; |
963 | long private_size; | |
964 | struct user_element *ue; | |
965 | int idx, err; | |
966 | ||
967 | if (card->user_ctl_count >= MAX_USER_CONTROLS) | |
968 | return -ENOMEM; | |
969 | if (info->count > 1024) | |
970 | return -EINVAL; | |
971 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 972 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
973 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
974 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
975 | info->id.numid = 0; |
976 | memset(&kctl, 0, sizeof(kctl)); | |
977 | down_write(&card->controls_rwsem); | |
978 | _kctl = snd_ctl_find_id(card, &info->id); | |
979 | err = 0; | |
980 | if (_kctl) { | |
981 | if (replace) | |
982 | err = snd_ctl_remove(card, _kctl); | |
983 | else | |
984 | err = -EBUSY; | |
985 | } else { | |
986 | if (replace) | |
987 | err = -ENOENT; | |
988 | } | |
989 | up_write(&card->controls_rwsem); | |
990 | if (err < 0) | |
991 | return err; | |
992 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
993 | kctl.count = info->owner ? info->owner : 1; | |
994 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
995 | kctl.info = snd_ctl_elem_user_info; | |
996 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
997 | kctl.get = snd_ctl_elem_user_get; | |
998 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
999 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
1000 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
1001 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
1002 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
1003 | } | |
1da177e4 LT |
1004 | switch (info->type) { |
1005 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
1006 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1007 | private_size = sizeof(long); | |
1008 | if (info->count > 128) | |
1009 | return -EINVAL; | |
1010 | break; | |
1011 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
1012 | private_size = sizeof(long long); | |
1013 | if (info->count > 64) | |
1014 | return -EINVAL; | |
1015 | break; | |
1016 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
1017 | private_size = sizeof(unsigned char); | |
1018 | if (info->count > 512) | |
1019 | return -EINVAL; | |
1020 | break; | |
1021 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1022 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1023 | if (info->count != 1) |
1024 | return -EINVAL; | |
1025 | break; | |
1026 | default: | |
1027 | return -EINVAL; | |
1028 | } | |
1029 | private_size *= info->count; | |
ca2c0966 | 1030 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1031 | if (ue == NULL) |
1032 | return -ENOMEM; | |
1033 | ue->info = *info; | |
86148e84 | 1034 | ue->info.access = 0; |
1da177e4 LT |
1035 | ue->elem_data = (char *)ue + sizeof(*ue); |
1036 | ue->elem_data_size = private_size; | |
1037 | kctl.private_free = snd_ctl_elem_user_free; | |
1038 | _kctl = snd_ctl_new(&kctl, access); | |
1039 | if (_kctl == NULL) { | |
2fbf182e | 1040 | kfree(ue); |
1da177e4 LT |
1041 | return -ENOMEM; |
1042 | } | |
1043 | _kctl->private_data = ue; | |
1044 | for (idx = 0; idx < _kctl->count; idx++) | |
1045 | _kctl->vd[idx].owner = file; | |
1046 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1047 | if (err < 0) |
1da177e4 | 1048 | return err; |
1da177e4 LT |
1049 | |
1050 | down_write(&card->controls_rwsem); | |
1051 | card->user_ctl_count++; | |
1052 | up_write(&card->controls_rwsem); | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
82e9bae6 TI |
1057 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1058 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1059 | { |
82e9bae6 | 1060 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1061 | if (copy_from_user(&info, _info, sizeof(info))) |
1062 | return -EFAULT; | |
1063 | return snd_ctl_elem_add(file, &info, replace); | |
1064 | } | |
1065 | ||
82e9bae6 TI |
1066 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1067 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1068 | { |
82e9bae6 | 1069 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1070 | int err; |
1071 | ||
1072 | if (copy_from_user(&id, _id, sizeof(id))) | |
1073 | return -EFAULT; | |
1074 | err = snd_ctl_remove_unlocked_id(file, &id); | |
1075 | if (! err) { | |
82e9bae6 | 1076 | struct snd_card *card = file->card; |
1da177e4 LT |
1077 | down_write(&card->controls_rwsem); |
1078 | card->user_ctl_count--; | |
1079 | up_write(&card->controls_rwsem); | |
1080 | } | |
1081 | return err; | |
1082 | } | |
1083 | ||
82e9bae6 | 1084 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1085 | { |
1086 | int subscribe; | |
1087 | if (get_user(subscribe, ptr)) | |
1088 | return -EFAULT; | |
1089 | if (subscribe < 0) { | |
1090 | subscribe = file->subscribed; | |
1091 | if (put_user(subscribe, ptr)) | |
1092 | return -EFAULT; | |
1093 | return 0; | |
1094 | } | |
1095 | if (subscribe) { | |
1096 | file->subscribed = 1; | |
1097 | return 0; | |
1098 | } else if (file->subscribed) { | |
1099 | snd_ctl_empty_read_queue(file); | |
1100 | file->subscribed = 0; | |
1101 | } | |
1102 | return 0; | |
1103 | } | |
1104 | ||
8aa9b586 JK |
1105 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1106 | struct snd_ctl_tlv __user *_tlv, | |
1107 | int op_flag) | |
42750b04 | 1108 | { |
8aa9b586 | 1109 | struct snd_card *card = file->card; |
42750b04 JK |
1110 | struct snd_ctl_tlv tlv; |
1111 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1112 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1113 | unsigned int len; |
1114 | int err = 0; | |
1115 | ||
1116 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1117 | return -EFAULT; | |
8aa9b586 JK |
1118 | if (tlv.length < sizeof(unsigned int) * 3) |
1119 | return -EINVAL; | |
1120 | down_read(&card->controls_rwsem); | |
1121 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1122 | if (kctl == NULL) { | |
1123 | err = -ENOENT; | |
1124 | goto __kctl_end; | |
1125 | } | |
1126 | if (kctl->tlv.p == NULL) { | |
1127 | err = -ENXIO; | |
1128 | goto __kctl_end; | |
1129 | } | |
1130 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1131 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1132 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1133 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1134 | err = -ENXIO; | |
1135 | goto __kctl_end; | |
1136 | } | |
1137 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
1138 | if (file && vd->owner != NULL && vd->owner != file) { | |
1139 | err = -EPERM; | |
1140 | goto __kctl_end; | |
1141 | } | |
1142 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); | |
1143 | if (err > 0) { | |
1144 | up_read(&card->controls_rwsem); | |
1145 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1146 | return 0; | |
1147 | } | |
1148 | } else { | |
1149 | if (op_flag) { | |
1150 | err = -ENXIO; | |
1151 | goto __kctl_end; | |
1152 | } | |
1153 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1154 | if (tlv.length < len) { | |
1155 | err = -ENOMEM; | |
1156 | goto __kctl_end; | |
1157 | } | |
1158 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1159 | err = -EFAULT; | |
1160 | } | |
42750b04 | 1161 | __kctl_end: |
8aa9b586 JK |
1162 | up_read(&card->controls_rwsem); |
1163 | return err; | |
42750b04 JK |
1164 | } |
1165 | ||
1da177e4 LT |
1166 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1167 | { | |
82e9bae6 TI |
1168 | struct snd_ctl_file *ctl; |
1169 | struct snd_card *card; | |
82e9bae6 | 1170 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1171 | void __user *argp = (void __user *)arg; |
1172 | int __user *ip = argp; | |
1173 | int err; | |
1174 | ||
1175 | ctl = file->private_data; | |
1176 | card = ctl->card; | |
1177 | snd_assert(card != NULL, return -ENXIO); | |
1178 | switch (cmd) { | |
1179 | case SNDRV_CTL_IOCTL_PVERSION: | |
1180 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1181 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1182 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1183 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1184 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1185 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1186 | return snd_ctl_elem_info_user(ctl, argp); | |
1187 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1188 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1189 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1190 | return snd_ctl_elem_write_user(ctl, argp); | |
1191 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1192 | return snd_ctl_elem_lock(ctl, argp); | |
1193 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1194 | return snd_ctl_elem_unlock(ctl, argp); | |
1195 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1196 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1197 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1198 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1199 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1200 | return snd_ctl_elem_remove(ctl, argp); | |
1201 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1202 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 JK |
1203 | case SNDRV_CTL_IOCTL_TLV_READ: |
1204 | return snd_ctl_tlv_ioctl(ctl, argp, 0); | |
1205 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
1206 | return snd_ctl_tlv_ioctl(ctl, argp, 1); | |
1207 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1208 | return snd_ctl_tlv_ioctl(ctl, argp, -1); | |
1da177e4 | 1209 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1210 | return -ENOPROTOOPT; |
1da177e4 LT |
1211 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1212 | #ifdef CONFIG_PM | |
1213 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1214 | #else | |
1215 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1216 | #endif | |
1217 | } | |
1218 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1219 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1220 | err = p->fioctl(card, ctl, cmd, arg); |
1221 | if (err != -ENOIOCTLCMD) { | |
1222 | up_read(&snd_ioctl_rwsem); | |
1223 | return err; | |
1224 | } | |
1225 | } | |
1226 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1227 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1228 | return -ENOTTY; |
1229 | } | |
1230 | ||
82e9bae6 TI |
1231 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1232 | size_t count, loff_t * offset) | |
1da177e4 | 1233 | { |
82e9bae6 | 1234 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1235 | int err = 0; |
1236 | ssize_t result = 0; | |
1237 | ||
1238 | ctl = file->private_data; | |
1239 | snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO); | |
1240 | if (!ctl->subscribed) | |
1241 | return -EBADFD; | |
82e9bae6 | 1242 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1243 | return -EINVAL; |
1244 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1245 | while (count >= sizeof(struct snd_ctl_event)) { |
1246 | struct snd_ctl_event ev; | |
1247 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1248 | while (list_empty(&ctl->events)) { |
1249 | wait_queue_t wait; | |
1250 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1251 | err = -EAGAIN; | |
1252 | goto __end_lock; | |
1253 | } | |
1254 | init_waitqueue_entry(&wait, current); | |
1255 | add_wait_queue(&ctl->change_sleep, &wait); | |
1256 | set_current_state(TASK_INTERRUPTIBLE); | |
1257 | spin_unlock_irq(&ctl->read_lock); | |
1258 | schedule(); | |
1259 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1260 | if (signal_pending(current)) | |
0e5d720c | 1261 | return -ERESTARTSYS; |
1da177e4 LT |
1262 | spin_lock_irq(&ctl->read_lock); |
1263 | } | |
1264 | kev = snd_kctl_event(ctl->events.next); | |
1265 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1266 | ev.data.elem.mask = kev->mask; | |
1267 | ev.data.elem.id = kev->id; | |
1268 | list_del(&kev->list); | |
1269 | spin_unlock_irq(&ctl->read_lock); | |
1270 | kfree(kev); | |
82e9bae6 | 1271 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1272 | err = -EFAULT; |
1273 | goto __end; | |
1274 | } | |
1275 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1276 | buffer += sizeof(struct snd_ctl_event); |
1277 | count -= sizeof(struct snd_ctl_event); | |
1278 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1279 | } |
1280 | __end_lock: | |
1281 | spin_unlock_irq(&ctl->read_lock); | |
1282 | __end: | |
1283 | return result > 0 ? result : err; | |
1284 | } | |
1285 | ||
1286 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1287 | { | |
1288 | unsigned int mask; | |
82e9bae6 | 1289 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1290 | |
1291 | ctl = file->private_data; | |
1292 | if (!ctl->subscribed) | |
1293 | return 0; | |
1294 | poll_wait(file, &ctl->change_sleep, wait); | |
1295 | ||
1296 | mask = 0; | |
1297 | if (!list_empty(&ctl->events)) | |
1298 | mask |= POLLIN | POLLRDNORM; | |
1299 | ||
1300 | return mask; | |
1301 | } | |
1302 | ||
1303 | /* | |
1304 | * register the device-specific control-ioctls. | |
1305 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1306 | */ | |
1307 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1308 | { | |
82e9bae6 | 1309 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1310 | |
82e9bae6 | 1311 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1312 | if (pn == NULL) |
1313 | return -ENOMEM; | |
1314 | pn->fioctl = fcn; | |
1315 | down_write(&snd_ioctl_rwsem); | |
1316 | list_add_tail(&pn->list, lists); | |
1317 | up_write(&snd_ioctl_rwsem); | |
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1322 | { | |
1323 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1324 | } | |
1325 | ||
c0d3fb39 TI |
1326 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1327 | ||
1da177e4 LT |
1328 | #ifdef CONFIG_COMPAT |
1329 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1330 | { | |
1331 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1332 | } | |
c0d3fb39 TI |
1333 | |
1334 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1335 | #endif |
1336 | ||
1337 | /* | |
1338 | * de-register the device-specific control-ioctls. | |
1339 | */ | |
82e9bae6 TI |
1340 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1341 | struct list_head *lists) | |
1da177e4 | 1342 | { |
82e9bae6 | 1343 | struct snd_kctl_ioctl *p; |
1da177e4 | 1344 | |
7c22f1aa | 1345 | snd_assert(fcn != NULL, return -EINVAL); |
1da177e4 | 1346 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1347 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1348 | if (p->fioctl == fcn) { |
1349 | list_del(&p->list); | |
1350 | up_write(&snd_ioctl_rwsem); | |
1351 | kfree(p); | |
1352 | return 0; | |
1353 | } | |
1354 | } | |
1355 | up_write(&snd_ioctl_rwsem); | |
1356 | snd_BUG(); | |
1357 | return -EINVAL; | |
1358 | } | |
1359 | ||
1360 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1361 | { | |
1362 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1363 | } | |
1364 | ||
c0d3fb39 TI |
1365 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1366 | ||
1da177e4 LT |
1367 | #ifdef CONFIG_COMPAT |
1368 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1369 | { | |
1370 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1371 | } | |
1372 | ||
c0d3fb39 | 1373 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1374 | #endif |
1375 | ||
1376 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1377 | { | |
82e9bae6 | 1378 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1379 | int err; |
1380 | ctl = file->private_data; | |
1381 | err = fasync_helper(fd, file, on, &ctl->fasync); | |
1382 | if (err < 0) | |
1383 | return err; | |
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | /* | |
1388 | * ioctl32 compat | |
1389 | */ | |
1390 | #ifdef CONFIG_COMPAT | |
1391 | #include "control_compat.c" | |
1392 | #else | |
1393 | #define snd_ctl_ioctl_compat NULL | |
1394 | #endif | |
1395 | ||
1396 | /* | |
1397 | * INIT PART | |
1398 | */ | |
1399 | ||
9c2e08c5 | 1400 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1401 | { |
1402 | .owner = THIS_MODULE, | |
1403 | .read = snd_ctl_read, | |
1404 | .open = snd_ctl_open, | |
1405 | .release = snd_ctl_release, | |
1406 | .poll = snd_ctl_poll, | |
1407 | .unlocked_ioctl = snd_ctl_ioctl, | |
1408 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1409 | .fasync = snd_ctl_fasync, | |
1410 | }; | |
1411 | ||
1da177e4 LT |
1412 | /* |
1413 | * registration of the control device | |
1414 | */ | |
82e9bae6 | 1415 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1416 | { |
82e9bae6 | 1417 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1418 | int err, cardnum; |
1419 | char name[16]; | |
1420 | ||
1421 | snd_assert(card != NULL, return -ENXIO); | |
1422 | cardnum = card->number; | |
1423 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1424 | sprintf(name, "controlC%i", cardnum); | |
f87135f5 CL |
1425 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1426 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1427 | return err; |
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * disconnection of the control device | |
1433 | */ | |
82e9bae6 | 1434 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1435 | { |
82e9bae6 | 1436 | struct snd_card *card = device->device_data; |
82e9bae6 | 1437 | struct snd_ctl_file *ctl; |
c461482c TI |
1438 | int err, cardnum; |
1439 | ||
1440 | snd_assert(card != NULL, return -ENXIO); | |
1441 | cardnum = card->number; | |
1442 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1da177e4 LT |
1443 | |
1444 | down_read(&card->controls_rwsem); | |
9244b2c3 | 1445 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1446 | wake_up(&ctl->change_sleep); |
1447 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1448 | } | |
1449 | up_read(&card->controls_rwsem); | |
c461482c TI |
1450 | |
1451 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1452 | card, -1)) < 0) | |
1453 | return err; | |
1da177e4 LT |
1454 | return 0; |
1455 | } | |
1456 | ||
1457 | /* | |
1458 | * free all controls | |
1459 | */ | |
82e9bae6 | 1460 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1461 | { |
82e9bae6 TI |
1462 | struct snd_card *card = device->device_data; |
1463 | struct snd_kcontrol *control; | |
1da177e4 LT |
1464 | |
1465 | down_write(&card->controls_rwsem); | |
1466 | while (!list_empty(&card->controls)) { | |
1467 | control = snd_kcontrol(card->controls.next); | |
1468 | snd_ctl_remove(card, control); | |
1469 | } | |
1470 | up_write(&card->controls_rwsem); | |
1471 | return 0; | |
1472 | } | |
1473 | ||
1da177e4 LT |
1474 | /* |
1475 | * create control core: | |
1476 | * called from init.c | |
1477 | */ | |
82e9bae6 | 1478 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1479 | { |
82e9bae6 | 1480 | static struct snd_device_ops ops = { |
1da177e4 LT |
1481 | .dev_free = snd_ctl_dev_free, |
1482 | .dev_register = snd_ctl_dev_register, | |
1483 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1484 | }; |
1485 | ||
1486 | snd_assert(card != NULL, return -ENXIO); | |
1487 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1488 | } |