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); | |
a0830dbd | 89 | snd_card_unref(card); |
1da177e4 LT |
90 | return 0; |
91 | ||
92 | __error: | |
93 | module_put(card->module); | |
94 | __error2: | |
95 | snd_card_file_remove(card, file); | |
96 | __error1: | |
a0830dbd TI |
97 | if (card) |
98 | snd_card_unref(card); | |
1da177e4 LT |
99 | return err; |
100 | } | |
101 | ||
82e9bae6 | 102 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 103 | { |
7507e8da | 104 | unsigned long flags; |
82e9bae6 | 105 | struct snd_kctl_event *cread; |
1da177e4 | 106 | |
7507e8da | 107 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
108 | while (!list_empty(&ctl->events)) { |
109 | cread = snd_kctl_event(ctl->events.next); | |
110 | list_del(&cread->list); | |
111 | kfree(cread); | |
112 | } | |
7507e8da | 113 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
114 | } |
115 | ||
116 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
117 | { | |
118 | unsigned long flags; | |
82e9bae6 TI |
119 | struct snd_card *card; |
120 | struct snd_ctl_file *ctl; | |
121 | struct snd_kcontrol *control; | |
1da177e4 LT |
122 | unsigned int idx; |
123 | ||
124 | ctl = file->private_data; | |
1da177e4 LT |
125 | file->private_data = NULL; |
126 | card = ctl->card; | |
127 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
128 | list_del(&ctl->list); | |
129 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
130 | down_write(&card->controls_rwsem); | |
9244b2c3 | 131 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
132 | for (idx = 0; idx < control->count; idx++) |
133 | if (control->vd[idx].owner == ctl) | |
134 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
135 | up_write(&card->controls_rwsem); |
136 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 137 | put_pid(ctl->pid); |
1da177e4 LT |
138 | kfree(ctl); |
139 | module_put(card->module); | |
140 | snd_card_file_remove(card, file); | |
141 | return 0; | |
142 | } | |
143 | ||
82e9bae6 TI |
144 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
145 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
146 | { |
147 | unsigned long flags; | |
82e9bae6 TI |
148 | struct snd_ctl_file *ctl; |
149 | struct snd_kctl_event *ev; | |
1da177e4 | 150 | |
7eaa943c TI |
151 | if (snd_BUG_ON(!card || !id)) |
152 | return; | |
1da177e4 | 153 | read_lock(&card->ctl_files_rwlock); |
8eeaa2f9 | 154 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
155 | card->mixer_oss_change_count++; |
156 | #endif | |
9244b2c3 | 157 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
158 | if (!ctl->subscribed) |
159 | continue; | |
160 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 161 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
162 | if (ev->id.numid == id->numid) { |
163 | ev->mask |= mask; | |
164 | goto _found; | |
165 | } | |
166 | } | |
ca2c0966 | 167 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
168 | if (ev) { |
169 | ev->id = *id; | |
170 | ev->mask = mask; | |
171 | list_add_tail(&ev->list, &ctl->events); | |
172 | } else { | |
bb009457 | 173 | dev_err(card->dev, "No memory available to allocate event\n"); |
1da177e4 LT |
174 | } |
175 | _found: | |
176 | wake_up(&ctl->change_sleep); | |
177 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
178 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
179 | } | |
180 | read_unlock(&card->ctl_files_rwlock); | |
181 | } | |
182 | ||
c0d3fb39 TI |
183 | EXPORT_SYMBOL(snd_ctl_notify); |
184 | ||
1da177e4 LT |
185 | /** |
186 | * snd_ctl_new - create a control instance from the template | |
187 | * @control: the control template | |
188 | * @access: the default control access | |
189 | * | |
82e9bae6 | 190 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
191 | * to the new instance. It does not copy volatile data (access). |
192 | * | |
eb7c06e8 | 193 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 194 | */ |
0b51ba07 AB |
195 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
196 | unsigned int access) | |
1da177e4 | 197 | { |
82e9bae6 | 198 | struct snd_kcontrol *kctl; |
1da177e4 LT |
199 | unsigned int idx; |
200 | ||
7eaa943c TI |
201 | if (snd_BUG_ON(!control || !control->count)) |
202 | return NULL; | |
5591bf07 DR |
203 | |
204 | if (control->count > MAX_CONTROL_COUNT) | |
205 | return NULL; | |
206 | ||
82e9bae6 | 207 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 | 208 | if (kctl == NULL) { |
bb009457 | 209 | pr_err("ALSA: Cannot allocate control instance\n"); |
1da177e4 | 210 | return NULL; |
73e77ba0 | 211 | } |
1da177e4 LT |
212 | *kctl = *control; |
213 | for (idx = 0; idx < kctl->count; idx++) | |
214 | kctl->vd[idx].access = access; | |
215 | return kctl; | |
216 | } | |
217 | ||
218 | /** | |
219 | * snd_ctl_new1 - create a control instance from the template | |
220 | * @ncontrol: the initialization record | |
221 | * @private_data: the private data to set | |
222 | * | |
82e9bae6 | 223 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
224 | * template. When the access field of ncontrol is 0, it's assumed as |
225 | * READWRITE access. When the count field is 0, it's assumes as one. | |
226 | * | |
eb7c06e8 | 227 | * Return: The pointer of the newly generated instance, or %NULL on failure. |
1da177e4 | 228 | */ |
82e9bae6 TI |
229 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
230 | void *private_data) | |
1da177e4 | 231 | { |
82e9bae6 | 232 | struct snd_kcontrol kctl; |
1da177e4 LT |
233 | unsigned int access; |
234 | ||
7eaa943c TI |
235 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
236 | return NULL; | |
1da177e4 LT |
237 | memset(&kctl, 0, sizeof(kctl)); |
238 | kctl.id.iface = ncontrol->iface; | |
239 | kctl.id.device = ncontrol->device; | |
240 | kctl.id.subdevice = ncontrol->subdevice; | |
366840d7 | 241 | if (ncontrol->name) { |
1da177e4 | 242 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
366840d7 | 243 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
bb009457 TI |
244 | pr_warn("ALSA: Control name '%s' truncated to '%s'\n", |
245 | ncontrol->name, kctl.id.name); | |
366840d7 | 246 | } |
1da177e4 LT |
247 | kctl.id.index = ncontrol->index; |
248 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
249 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 | 250 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
a8d372f1 | 251 | SNDRV_CTL_ELEM_ACCESS_VOLATILE| |
8aa9b586 | 252 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
a75d7a4c CL |
253 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
254 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| | |
255 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
256 | kctl.info = ncontrol->info; |
257 | kctl.get = ncontrol->get; | |
258 | kctl.put = ncontrol->put; | |
8aa9b586 | 259 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
260 | kctl.private_value = ncontrol->private_value; |
261 | kctl.private_data = private_data; | |
262 | return snd_ctl_new(&kctl, access); | |
263 | } | |
264 | ||
c0d3fb39 TI |
265 | EXPORT_SYMBOL(snd_ctl_new1); |
266 | ||
1da177e4 LT |
267 | /** |
268 | * snd_ctl_free_one - release the control instance | |
269 | * @kcontrol: the control instance | |
270 | * | |
271 | * Releases the control instance created via snd_ctl_new() | |
272 | * or snd_ctl_new1(). | |
273 | * Don't call this after the control was added to the card. | |
274 | */ | |
82e9bae6 | 275 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
276 | { |
277 | if (kcontrol) { | |
278 | if (kcontrol->private_free) | |
279 | kcontrol->private_free(kcontrol); | |
280 | kfree(kcontrol); | |
281 | } | |
282 | } | |
283 | ||
c0d3fb39 TI |
284 | EXPORT_SYMBOL(snd_ctl_free_one); |
285 | ||
0e82e5fa CL |
286 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
287 | unsigned int count) | |
1da177e4 | 288 | { |
82e9bae6 | 289 | struct snd_kcontrol *kctl; |
1da177e4 | 290 | |
9244b2c3 | 291 | list_for_each_entry(kctl, &card->controls, list) { |
7c733587 | 292 | if (kctl->id.numid < card->last_numid + 1 + count && |
0e82e5fa CL |
293 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
294 | card->last_numid = kctl->id.numid + kctl->count - 1; | |
295 | return true; | |
296 | } | |
1da177e4 | 297 | } |
0e82e5fa | 298 | return false; |
1da177e4 LT |
299 | } |
300 | ||
82e9bae6 | 301 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 | 302 | { |
0e82e5fa | 303 | unsigned int iter = 100000; |
1da177e4 | 304 | |
0e82e5fa | 305 | while (snd_ctl_remove_numid_conflict(card, count)) { |
1da177e4 LT |
306 | if (--iter == 0) { |
307 | /* this situation is very unlikely */ | |
bb009457 | 308 | dev_err(card->dev, "unable to allocate new control numid\n"); |
1da177e4 LT |
309 | return -ENOMEM; |
310 | } | |
1da177e4 LT |
311 | } |
312 | return 0; | |
313 | } | |
314 | ||
315 | /** | |
316 | * snd_ctl_add - add the control instance to the card | |
317 | * @card: the card instance | |
318 | * @kcontrol: the control instance to add | |
319 | * | |
320 | * Adds the control instance created via snd_ctl_new() or | |
321 | * snd_ctl_new1() to the given card. Assigns also an unique | |
322 | * numid used for fast search. | |
323 | * | |
1da177e4 | 324 | * It frees automatically the control which cannot be added. |
eb7c06e8 YB |
325 | * |
326 | * Return: Zero if successful, or a negative error code on failure. | |
327 | * | |
1da177e4 | 328 | */ |
82e9bae6 | 329 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 330 | { |
82e9bae6 | 331 | struct snd_ctl_elem_id id; |
1da177e4 | 332 | unsigned int idx; |
c6077b30 | 333 | int err = -EINVAL; |
1da177e4 | 334 | |
73e77ba0 | 335 | if (! kcontrol) |
c6077b30 | 336 | return err; |
7eaa943c TI |
337 | if (snd_BUG_ON(!card || !kcontrol->info)) |
338 | goto error; | |
1da177e4 LT |
339 | id = kcontrol->id; |
340 | down_write(&card->controls_rwsem); | |
341 | if (snd_ctl_find_id(card, &id)) { | |
342 | up_write(&card->controls_rwsem); | |
bb009457 | 343 | dev_err(card->dev, "control %i:%i:%i:%s:%i is already present\n", |
1da177e4 LT |
344 | id.iface, |
345 | id.device, | |
346 | id.subdevice, | |
347 | id.name, | |
348 | id.index); | |
c6077b30 TI |
349 | err = -EBUSY; |
350 | goto error; | |
1da177e4 LT |
351 | } |
352 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
353 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
354 | err = -ENOMEM; |
355 | goto error; | |
1da177e4 LT |
356 | } |
357 | list_add_tail(&kcontrol->list, &card->controls); | |
358 | card->controls_count += kcontrol->count; | |
359 | kcontrol->id.numid = card->last_numid + 1; | |
360 | card->last_numid += kcontrol->count; | |
361 | up_write(&card->controls_rwsem); | |
362 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
363 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
364 | return 0; | |
c6077b30 TI |
365 | |
366 | error: | |
367 | snd_ctl_free_one(kcontrol); | |
368 | return err; | |
1da177e4 LT |
369 | } |
370 | ||
c0d3fb39 TI |
371 | EXPORT_SYMBOL(snd_ctl_add); |
372 | ||
66b5b972 DP |
373 | /** |
374 | * snd_ctl_replace - replace the control instance of the card | |
375 | * @card: the card instance | |
376 | * @kcontrol: the control instance to replace | |
377 | * @add_on_replace: add the control if not already added | |
378 | * | |
379 | * Replaces the given control. If the given control does not exist | |
380 | * and the add_on_replace flag is set, the control is added. If the | |
381 | * control exists, it is destroyed first. | |
382 | * | |
66b5b972 | 383 | * It frees automatically the control which cannot be added or replaced. |
eb7c06e8 YB |
384 | * |
385 | * Return: Zero if successful, or a negative error code on failure. | |
66b5b972 DP |
386 | */ |
387 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, | |
388 | bool add_on_replace) | |
389 | { | |
390 | struct snd_ctl_elem_id id; | |
391 | unsigned int idx; | |
392 | struct snd_kcontrol *old; | |
393 | int ret; | |
394 | ||
395 | if (!kcontrol) | |
396 | return -EINVAL; | |
397 | if (snd_BUG_ON(!card || !kcontrol->info)) { | |
398 | ret = -EINVAL; | |
399 | goto error; | |
400 | } | |
401 | id = kcontrol->id; | |
402 | down_write(&card->controls_rwsem); | |
403 | old = snd_ctl_find_id(card, &id); | |
404 | if (!old) { | |
405 | if (add_on_replace) | |
406 | goto add; | |
407 | up_write(&card->controls_rwsem); | |
408 | ret = -EINVAL; | |
409 | goto error; | |
410 | } | |
411 | ret = snd_ctl_remove(card, old); | |
412 | if (ret < 0) { | |
413 | up_write(&card->controls_rwsem); | |
414 | goto error; | |
415 | } | |
416 | add: | |
417 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
418 | up_write(&card->controls_rwsem); | |
419 | ret = -ENOMEM; | |
420 | goto error; | |
421 | } | |
422 | list_add_tail(&kcontrol->list, &card->controls); | |
423 | card->controls_count += kcontrol->count; | |
424 | kcontrol->id.numid = card->last_numid + 1; | |
425 | card->last_numid += kcontrol->count; | |
426 | up_write(&card->controls_rwsem); | |
427 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
428 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
429 | return 0; | |
430 | ||
431 | error: | |
432 | snd_ctl_free_one(kcontrol); | |
433 | return ret; | |
434 | } | |
435 | EXPORT_SYMBOL(snd_ctl_replace); | |
436 | ||
1da177e4 LT |
437 | /** |
438 | * snd_ctl_remove - remove the control from the card and release it | |
439 | * @card: the card instance | |
440 | * @kcontrol: the control instance to remove | |
441 | * | |
442 | * Removes the control from the card and then releases the instance. | |
443 | * You don't need to call snd_ctl_free_one(). You must be in | |
444 | * the write lock - down_write(&card->controls_rwsem). | |
eb7c06e8 YB |
445 | * |
446 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 447 | */ |
82e9bae6 | 448 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 449 | { |
82e9bae6 | 450 | struct snd_ctl_elem_id id; |
1da177e4 LT |
451 | unsigned int idx; |
452 | ||
7eaa943c TI |
453 | if (snd_BUG_ON(!card || !kcontrol)) |
454 | return -EINVAL; | |
1da177e4 LT |
455 | list_del(&kcontrol->list); |
456 | card->controls_count -= kcontrol->count; | |
457 | id = kcontrol->id; | |
458 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
459 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
460 | snd_ctl_free_one(kcontrol); | |
461 | return 0; | |
462 | } | |
463 | ||
c0d3fb39 TI |
464 | EXPORT_SYMBOL(snd_ctl_remove); |
465 | ||
1da177e4 LT |
466 | /** |
467 | * snd_ctl_remove_id - remove the control of the given id and release it | |
468 | * @card: the card instance | |
469 | * @id: the control id to remove | |
470 | * | |
471 | * Finds the control instance with the given id, removes it from the | |
472 | * card list and releases it. | |
eb7c06e8 YB |
473 | * |
474 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 475 | */ |
82e9bae6 | 476 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 477 | { |
82e9bae6 | 478 | struct snd_kcontrol *kctl; |
1da177e4 LT |
479 | int ret; |
480 | ||
481 | down_write(&card->controls_rwsem); | |
482 | kctl = snd_ctl_find_id(card, id); | |
483 | if (kctl == NULL) { | |
484 | up_write(&card->controls_rwsem); | |
485 | return -ENOENT; | |
486 | } | |
487 | ret = snd_ctl_remove(card, kctl); | |
488 | up_write(&card->controls_rwsem); | |
489 | return ret; | |
490 | } | |
491 | ||
c0d3fb39 TI |
492 | EXPORT_SYMBOL(snd_ctl_remove_id); |
493 | ||
1da177e4 | 494 | /** |
f217ac59 | 495 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
496 | * @file: active control handle |
497 | * @id: the control id to remove | |
498 | * | |
499 | * Finds the control instance with the given id, removes it from the | |
500 | * card list and releases it. | |
eb7c06e8 YB |
501 | * |
502 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 503 | */ |
f217ac59 CL |
504 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
505 | struct snd_ctl_elem_id *id) | |
1da177e4 | 506 | { |
82e9bae6 TI |
507 | struct snd_card *card = file->card; |
508 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
509 | int idx, ret; |
510 | ||
511 | down_write(&card->controls_rwsem); | |
512 | kctl = snd_ctl_find_id(card, id); | |
513 | if (kctl == NULL) { | |
317b8081 CL |
514 | ret = -ENOENT; |
515 | goto error; | |
1da177e4 | 516 | } |
18dd0aa5 CL |
517 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
518 | ret = -EINVAL; | |
519 | goto error; | |
520 | } | |
1da177e4 LT |
521 | for (idx = 0; idx < kctl->count; idx++) |
522 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
523 | ret = -EBUSY; |
524 | goto error; | |
1da177e4 LT |
525 | } |
526 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
527 | if (ret < 0) |
528 | goto error; | |
529 | card->user_ctl_count--; | |
317b8081 | 530 | error: |
1da177e4 LT |
531 | up_write(&card->controls_rwsem); |
532 | return ret; | |
533 | } | |
534 | ||
3cbdd753 TI |
535 | /** |
536 | * snd_ctl_activate_id - activate/inactivate the control of the given id | |
537 | * @card: the card instance | |
538 | * @id: the control id to activate/inactivate | |
539 | * @active: non-zero to activate | |
540 | * | |
541 | * Finds the control instance with the given id, and activate or | |
542 | * inactivate the control together with notification, if changed. | |
543 | * | |
eb7c06e8 | 544 | * Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
3cbdd753 TI |
545 | */ |
546 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, | |
547 | int active) | |
548 | { | |
549 | struct snd_kcontrol *kctl; | |
550 | struct snd_kcontrol_volatile *vd; | |
551 | unsigned int index_offset; | |
552 | int ret; | |
553 | ||
554 | down_write(&card->controls_rwsem); | |
555 | kctl = snd_ctl_find_id(card, id); | |
556 | if (kctl == NULL) { | |
557 | ret = -ENOENT; | |
558 | goto unlock; | |
559 | } | |
560 | index_offset = snd_ctl_get_ioff(kctl, &kctl->id); | |
561 | vd = &kctl->vd[index_offset]; | |
562 | ret = 0; | |
563 | if (active) { | |
564 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) | |
565 | goto unlock; | |
566 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
567 | } else { | |
568 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) | |
569 | goto unlock; | |
570 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
571 | } | |
572 | ret = 1; | |
573 | unlock: | |
574 | up_write(&card->controls_rwsem); | |
575 | if (ret > 0) | |
576 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); | |
577 | return ret; | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); | |
580 | ||
1da177e4 LT |
581 | /** |
582 | * snd_ctl_rename_id - replace the id of a control on the card | |
583 | * @card: the card instance | |
584 | * @src_id: the old id | |
585 | * @dst_id: the new id | |
586 | * | |
587 | * Finds the control with the old id from the card, and replaces the | |
588 | * id with the new one. | |
589 | * | |
eb7c06e8 | 590 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 591 | */ |
82e9bae6 TI |
592 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
593 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 594 | { |
82e9bae6 | 595 | struct snd_kcontrol *kctl; |
1da177e4 LT |
596 | |
597 | down_write(&card->controls_rwsem); | |
598 | kctl = snd_ctl_find_id(card, src_id); | |
599 | if (kctl == NULL) { | |
600 | up_write(&card->controls_rwsem); | |
601 | return -ENOENT; | |
602 | } | |
603 | kctl->id = *dst_id; | |
604 | kctl->id.numid = card->last_numid + 1; | |
605 | card->last_numid += kctl->count; | |
606 | up_write(&card->controls_rwsem); | |
607 | return 0; | |
608 | } | |
609 | ||
c0d3fb39 TI |
610 | EXPORT_SYMBOL(snd_ctl_rename_id); |
611 | ||
1da177e4 LT |
612 | /** |
613 | * snd_ctl_find_numid - find the control instance with the given number-id | |
614 | * @card: the card instance | |
615 | * @numid: the number-id to search | |
616 | * | |
617 | * Finds the control instance with the given number-id from the card. | |
618 | * | |
1da177e4 LT |
619 | * The caller must down card->controls_rwsem before calling this function |
620 | * (if the race condition can happen). | |
eb7c06e8 YB |
621 | * |
622 | * Return: The pointer of the instance if found, or %NULL if not. | |
623 | * | |
1da177e4 | 624 | */ |
82e9bae6 | 625 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 626 | { |
82e9bae6 | 627 | struct snd_kcontrol *kctl; |
1da177e4 | 628 | |
7eaa943c TI |
629 | if (snd_BUG_ON(!card || !numid)) |
630 | return NULL; | |
9244b2c3 | 631 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
632 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
633 | return kctl; | |
634 | } | |
635 | return NULL; | |
636 | } | |
637 | ||
c0d3fb39 TI |
638 | EXPORT_SYMBOL(snd_ctl_find_numid); |
639 | ||
1da177e4 LT |
640 | /** |
641 | * snd_ctl_find_id - find the control instance with the given id | |
642 | * @card: the card instance | |
643 | * @id: the id to search | |
644 | * | |
645 | * Finds the control instance with the given id from the card. | |
646 | * | |
1da177e4 LT |
647 | * The caller must down card->controls_rwsem before calling this function |
648 | * (if the race condition can happen). | |
eb7c06e8 YB |
649 | * |
650 | * Return: The pointer of the instance if found, or %NULL if not. | |
651 | * | |
1da177e4 | 652 | */ |
82e9bae6 TI |
653 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
654 | struct snd_ctl_elem_id *id) | |
1da177e4 | 655 | { |
82e9bae6 | 656 | struct snd_kcontrol *kctl; |
1da177e4 | 657 | |
7eaa943c TI |
658 | if (snd_BUG_ON(!card || !id)) |
659 | return NULL; | |
1da177e4 LT |
660 | if (id->numid != 0) |
661 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 662 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
663 | if (kctl->id.iface != id->iface) |
664 | continue; | |
665 | if (kctl->id.device != id->device) | |
666 | continue; | |
667 | if (kctl->id.subdevice != id->subdevice) | |
668 | continue; | |
669 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
670 | continue; | |
671 | if (kctl->id.index > id->index) | |
672 | continue; | |
673 | if (kctl->id.index + kctl->count <= id->index) | |
674 | continue; | |
675 | return kctl; | |
676 | } | |
677 | return NULL; | |
678 | } | |
679 | ||
c0d3fb39 TI |
680 | EXPORT_SYMBOL(snd_ctl_find_id); |
681 | ||
82e9bae6 | 682 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
683 | unsigned int cmd, void __user *arg) |
684 | { | |
82e9bae6 | 685 | struct snd_ctl_card_info *info; |
1da177e4 | 686 | |
ca2c0966 | 687 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
688 | if (! info) |
689 | return -ENOMEM; | |
690 | down_read(&snd_ioctl_rwsem); | |
691 | info->card = card->number; | |
692 | strlcpy(info->id, card->id, sizeof(info->id)); | |
693 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
694 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
695 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
696 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
697 | strlcpy(info->components, card->components, sizeof(info->components)); | |
698 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 699 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
700 | kfree(info); |
701 | return -EFAULT; | |
702 | } | |
703 | kfree(info); | |
704 | return 0; | |
705 | } | |
706 | ||
82e9bae6 TI |
707 | static int snd_ctl_elem_list(struct snd_card *card, |
708 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
709 | { |
710 | struct list_head *plist; | |
82e9bae6 TI |
711 | struct snd_ctl_elem_list list; |
712 | struct snd_kcontrol *kctl; | |
713 | struct snd_ctl_elem_id *dst, *id; | |
78fa2c4d | 714 | unsigned int offset, space, jidx; |
1da177e4 LT |
715 | |
716 | if (copy_from_user(&list, _list, sizeof(list))) | |
717 | return -EFAULT; | |
718 | offset = list.offset; | |
719 | space = list.space; | |
1da177e4 LT |
720 | /* try limit maximum space */ |
721 | if (space > 16384) | |
722 | return -ENOMEM; | |
723 | if (space > 0) { | |
724 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 725 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
726 | if (dst == NULL) |
727 | return -ENOMEM; | |
728 | down_read(&card->controls_rwsem); | |
729 | list.count = card->controls_count; | |
730 | plist = card->controls.next; | |
731 | while (plist != &card->controls) { | |
732 | if (offset == 0) | |
733 | break; | |
734 | kctl = snd_kcontrol(plist); | |
735 | if (offset < kctl->count) | |
736 | break; | |
737 | offset -= kctl->count; | |
738 | plist = plist->next; | |
739 | } | |
740 | list.used = 0; | |
741 | id = dst; | |
742 | while (space > 0 && plist != &card->controls) { | |
743 | kctl = snd_kcontrol(plist); | |
744 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
745 | snd_ctl_build_ioff(id, kctl, jidx); | |
746 | id++; | |
747 | space--; | |
748 | list.used++; | |
749 | } | |
750 | plist = plist->next; | |
751 | offset = 0; | |
752 | } | |
753 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
754 | if (list.used > 0 && |
755 | copy_to_user(list.pids, dst, | |
756 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
757 | vfree(dst); |
758 | return -EFAULT; | |
759 | } | |
760 | vfree(dst); | |
761 | } else { | |
762 | down_read(&card->controls_rwsem); | |
763 | list.count = card->controls_count; | |
764 | up_read(&card->controls_rwsem); | |
765 | } | |
766 | if (copy_to_user(_list, &list, sizeof(list))) | |
767 | return -EFAULT; | |
768 | return 0; | |
769 | } | |
770 | ||
82e9bae6 TI |
771 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
772 | struct snd_ctl_elem_info *info) | |
1da177e4 | 773 | { |
82e9bae6 TI |
774 | struct snd_card *card = ctl->card; |
775 | struct snd_kcontrol *kctl; | |
776 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
777 | unsigned int index_offset; |
778 | int result; | |
779 | ||
780 | down_read(&card->controls_rwsem); | |
781 | kctl = snd_ctl_find_id(card, &info->id); | |
782 | if (kctl == NULL) { | |
783 | up_read(&card->controls_rwsem); | |
784 | return -ENOENT; | |
785 | } | |
786 | #ifdef CONFIG_SND_DEBUG | |
787 | info->access = 0; | |
788 | #endif | |
789 | result = kctl->info(kctl, info); | |
790 | if (result >= 0) { | |
7eaa943c | 791 | snd_BUG_ON(info->access); |
1da177e4 LT |
792 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
793 | vd = &kctl->vd[index_offset]; | |
794 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
795 | info->access = vd->access; | |
796 | if (vd->owner) { | |
797 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
798 | if (vd->owner == ctl) | |
799 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 800 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
801 | } else { |
802 | info->owner = -1; | |
803 | } | |
804 | } | |
805 | up_read(&card->controls_rwsem); | |
806 | return result; | |
807 | } | |
808 | ||
82e9bae6 TI |
809 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
810 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 811 | { |
82e9bae6 | 812 | struct snd_ctl_elem_info info; |
1da177e4 LT |
813 | int result; |
814 | ||
815 | if (copy_from_user(&info, _info, sizeof(info))) | |
816 | return -EFAULT; | |
64649400 | 817 | snd_power_lock(ctl->card); |
cbac4b0c | 818 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
819 | if (result >= 0) |
820 | result = snd_ctl_elem_info(ctl, &info); | |
821 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
822 | if (result >= 0) |
823 | if (copy_to_user(_info, &info, sizeof(info))) | |
824 | return -EFAULT; | |
825 | return result; | |
826 | } | |
827 | ||
d3bd67cd TI |
828 | static int snd_ctl_elem_read(struct snd_card *card, |
829 | struct snd_ctl_elem_value *control) | |
1da177e4 | 830 | { |
82e9bae6 TI |
831 | struct snd_kcontrol *kctl; |
832 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 833 | unsigned int index_offset; |
8ace4f3c | 834 | int result; |
1da177e4 LT |
835 | |
836 | down_read(&card->controls_rwsem); | |
837 | kctl = snd_ctl_find_id(card, &control->id); | |
838 | if (kctl == NULL) { | |
839 | result = -ENOENT; | |
840 | } else { | |
841 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
842 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
843 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
844 | kctl->get != NULL) { | |
845 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
846 | result = kctl->get(kctl, control); | |
847 | } else | |
848 | result = -EPERM; | |
1da177e4 LT |
849 | } |
850 | up_read(&card->controls_rwsem); | |
851 | return result; | |
852 | } | |
853 | ||
82e9bae6 TI |
854 | static int snd_ctl_elem_read_user(struct snd_card *card, |
855 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 856 | { |
82e9bae6 | 857 | struct snd_ctl_elem_value *control; |
1da177e4 | 858 | int result; |
ef44a1ec LZ |
859 | |
860 | control = memdup_user(_control, sizeof(*control)); | |
861 | if (IS_ERR(control)) | |
862 | return PTR_ERR(control); | |
863 | ||
64649400 | 864 | snd_power_lock(card); |
cbac4b0c | 865 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
866 | if (result >= 0) |
867 | result = snd_ctl_elem_read(card, control); | |
868 | snd_power_unlock(card); | |
1da177e4 LT |
869 | if (result >= 0) |
870 | if (copy_to_user(_control, control, sizeof(*control))) | |
871 | result = -EFAULT; | |
872 | kfree(control); | |
873 | return result; | |
874 | } | |
875 | ||
d3bd67cd TI |
876 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
877 | struct snd_ctl_elem_value *control) | |
1da177e4 | 878 | { |
82e9bae6 TI |
879 | struct snd_kcontrol *kctl; |
880 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 881 | unsigned int index_offset; |
8ace4f3c | 882 | int result; |
1da177e4 LT |
883 | |
884 | down_read(&card->controls_rwsem); | |
885 | kctl = snd_ctl_find_id(card, &control->id); | |
886 | if (kctl == NULL) { | |
887 | result = -ENOENT; | |
888 | } else { | |
889 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
890 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
891 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
892 | kctl->put == NULL || | |
893 | (file && vd->owner && vd->owner != file)) { | |
894 | result = -EPERM; | |
1da177e4 | 895 | } else { |
8ace4f3c TI |
896 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
897 | result = kctl->put(kctl, control); | |
898 | } | |
899 | if (result > 0) { | |
900 | up_read(&card->controls_rwsem); | |
901 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
902 | &control->id); | |
903 | return 0; | |
1da177e4 LT |
904 | } |
905 | } | |
906 | up_read(&card->controls_rwsem); | |
907 | return result; | |
908 | } | |
909 | ||
82e9bae6 TI |
910 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
911 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 912 | { |
82e9bae6 | 913 | struct snd_ctl_elem_value *control; |
64649400 | 914 | struct snd_card *card; |
1da177e4 LT |
915 | int result; |
916 | ||
ef44a1ec LZ |
917 | control = memdup_user(_control, sizeof(*control)); |
918 | if (IS_ERR(control)) | |
919 | return PTR_ERR(control); | |
920 | ||
64649400 GP |
921 | card = file->card; |
922 | snd_power_lock(card); | |
cbac4b0c | 923 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
924 | if (result >= 0) |
925 | result = snd_ctl_elem_write(card, file, control); | |
926 | snd_power_unlock(card); | |
1da177e4 LT |
927 | if (result >= 0) |
928 | if (copy_to_user(_control, control, sizeof(*control))) | |
929 | result = -EFAULT; | |
930 | kfree(control); | |
931 | return result; | |
932 | } | |
933 | ||
82e9bae6 TI |
934 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
935 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 936 | { |
82e9bae6 TI |
937 | struct snd_card *card = file->card; |
938 | struct snd_ctl_elem_id id; | |
939 | struct snd_kcontrol *kctl; | |
940 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
941 | int result; |
942 | ||
943 | if (copy_from_user(&id, _id, sizeof(id))) | |
944 | return -EFAULT; | |
945 | down_write(&card->controls_rwsem); | |
946 | kctl = snd_ctl_find_id(card, &id); | |
947 | if (kctl == NULL) { | |
948 | result = -ENOENT; | |
949 | } else { | |
950 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
951 | if (vd->owner != NULL) | |
952 | result = -EBUSY; | |
953 | else { | |
954 | vd->owner = file; | |
1da177e4 LT |
955 | result = 0; |
956 | } | |
957 | } | |
958 | up_write(&card->controls_rwsem); | |
959 | return result; | |
960 | } | |
961 | ||
82e9bae6 TI |
962 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
963 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 964 | { |
82e9bae6 TI |
965 | struct snd_card *card = file->card; |
966 | struct snd_ctl_elem_id id; | |
967 | struct snd_kcontrol *kctl; | |
968 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
969 | int result; |
970 | ||
971 | if (copy_from_user(&id, _id, sizeof(id))) | |
972 | return -EFAULT; | |
973 | down_write(&card->controls_rwsem); | |
974 | kctl = snd_ctl_find_id(card, &id); | |
975 | if (kctl == NULL) { | |
976 | result = -ENOENT; | |
977 | } else { | |
978 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
979 | if (vd->owner == NULL) | |
980 | result = -EINVAL; | |
981 | else if (vd->owner != file) | |
982 | result = -EPERM; | |
983 | else { | |
984 | vd->owner = NULL; | |
1da177e4 LT |
985 | result = 0; |
986 | } | |
987 | } | |
988 | up_write(&card->controls_rwsem); | |
989 | return result; | |
990 | } | |
991 | ||
992 | struct user_element { | |
82e9bae6 | 993 | struct snd_ctl_elem_info info; |
1da177e4 LT |
994 | void *elem_data; /* element data */ |
995 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
996 | void *tlv_data; /* TLV data */ |
997 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 | 998 | void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4 LT |
999 | }; |
1000 | ||
82e9bae6 TI |
1001 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
1002 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
1003 | { |
1004 | struct user_element *ue = kcontrol->private_data; | |
1005 | ||
1006 | *uinfo = ue->info; | |
1007 | return 0; | |
1008 | } | |
1009 | ||
8d448162 CL |
1010 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
1011 | struct snd_ctl_elem_info *uinfo) | |
1012 | { | |
1013 | struct user_element *ue = kcontrol->private_data; | |
1014 | const char *names; | |
1015 | unsigned int item; | |
1016 | ||
1017 | item = uinfo->value.enumerated.item; | |
1018 | ||
1019 | *uinfo = ue->info; | |
1020 | ||
1021 | item = min(item, uinfo->value.enumerated.items - 1); | |
1022 | uinfo->value.enumerated.item = item; | |
1023 | ||
1024 | names = ue->priv_data; | |
1025 | for (; item > 0; --item) | |
1026 | names += strlen(names) + 1; | |
1027 | strcpy(uinfo->value.enumerated.name, names); | |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | ||
82e9bae6 TI |
1032 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
1033 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1034 | { |
1035 | struct user_element *ue = kcontrol->private_data; | |
1036 | ||
1037 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
1038 | return 0; | |
1039 | } | |
1040 | ||
82e9bae6 TI |
1041 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
1042 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1043 | { |
1044 | int change; | |
1045 | struct user_element *ue = kcontrol->private_data; | |
1046 | ||
1047 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
1048 | if (change) | |
1049 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
1050 | return change; | |
1051 | } | |
1052 | ||
8aa9b586 JK |
1053 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
1054 | int op_flag, | |
1055 | unsigned int size, | |
1056 | unsigned int __user *tlv) | |
1057 | { | |
1058 | struct user_element *ue = kcontrol->private_data; | |
1059 | int change = 0; | |
1060 | void *new_data; | |
1061 | ||
1062 | if (op_flag > 0) { | |
1063 | if (size > 1024 * 128) /* sane value */ | |
1064 | return -EINVAL; | |
ef44a1ec LZ |
1065 | |
1066 | new_data = memdup_user(tlv, size); | |
1067 | if (IS_ERR(new_data)) | |
1068 | return PTR_ERR(new_data); | |
8aa9b586 JK |
1069 | change = ue->tlv_data_size != size; |
1070 | if (!change) | |
1071 | change = memcmp(ue->tlv_data, new_data, size); | |
1072 | kfree(ue->tlv_data); | |
1073 | ue->tlv_data = new_data; | |
1074 | ue->tlv_data_size = size; | |
1075 | } else { | |
18c1c3f6 TI |
1076 | if (! ue->tlv_data_size || ! ue->tlv_data) |
1077 | return -ENXIO; | |
8aa9b586 JK |
1078 | if (size < ue->tlv_data_size) |
1079 | return -ENOSPC; | |
1080 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) | |
1081 | return -EFAULT; | |
1082 | } | |
1083 | return change; | |
1084 | } | |
1085 | ||
8d448162 CL |
1086 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
1087 | { | |
1088 | char *names, *p; | |
1089 | size_t buf_len, name_len; | |
1090 | unsigned int i; | |
447c6f93 | 1091 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162 CL |
1092 | |
1093 | if (ue->info.value.enumerated.names_length > 64 * 1024) | |
1094 | return -EINVAL; | |
1095 | ||
447c6f93 | 1096 | names = memdup_user((const void __user *)user_ptrval, |
8d448162 CL |
1097 | ue->info.value.enumerated.names_length); |
1098 | if (IS_ERR(names)) | |
1099 | return PTR_ERR(names); | |
1100 | ||
1101 | /* check that there are enough valid names */ | |
1102 | buf_len = ue->info.value.enumerated.names_length; | |
1103 | p = names; | |
1104 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { | |
1105 | name_len = strnlen(p, buf_len); | |
1106 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { | |
1107 | kfree(names); | |
1108 | return -EINVAL; | |
1109 | } | |
1110 | p += name_len + 1; | |
1111 | buf_len -= name_len + 1; | |
1112 | } | |
1113 | ||
1114 | ue->priv_data = names; | |
1115 | ue->info.value.enumerated.names_ptr = 0; | |
1116 | ||
1117 | return 0; | |
1118 | } | |
1119 | ||
82e9bae6 | 1120 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 1121 | { |
8aa9b586 | 1122 | struct user_element *ue = kcontrol->private_data; |
8d448162 CL |
1123 | |
1124 | kfree(ue->tlv_data); | |
1125 | kfree(ue->priv_data); | |
8aa9b586 | 1126 | kfree(ue); |
1da177e4 LT |
1127 | } |
1128 | ||
82e9bae6 TI |
1129 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
1130 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 1131 | { |
82e9bae6 TI |
1132 | struct snd_card *card = file->card; |
1133 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
1134 | unsigned int access; |
1135 | long private_size; | |
1136 | struct user_element *ue; | |
1137 | int idx, err; | |
983929ca | 1138 | |
08ede038 | 1139 | if (!replace && card->user_ctl_count >= MAX_USER_CONTROLS) |
1da177e4 | 1140 | return -ENOMEM; |
2a031aed | 1141 | if (info->count < 1) |
1da177e4 LT |
1142 | return -EINVAL; |
1143 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 1144 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
1145 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
1146 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
1147 | info->id.numid = 0; |
1148 | memset(&kctl, 0, sizeof(kctl)); | |
1149 | down_write(&card->controls_rwsem); | |
1150 | _kctl = snd_ctl_find_id(card, &info->id); | |
1151 | err = 0; | |
1152 | if (_kctl) { | |
1153 | if (replace) | |
1154 | err = snd_ctl_remove(card, _kctl); | |
1155 | else | |
1156 | err = -EBUSY; | |
1157 | } else { | |
1158 | if (replace) | |
1159 | err = -ENOENT; | |
1160 | } | |
1161 | up_write(&card->controls_rwsem); | |
1162 | if (err < 0) | |
1163 | return err; | |
1164 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
1165 | kctl.count = info->owner ? info->owner : 1; | |
1166 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
8d448162 CL |
1167 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) |
1168 | kctl.info = snd_ctl_elem_user_enum_info; | |
1169 | else | |
1170 | kctl.info = snd_ctl_elem_user_info; | |
1da177e4 LT |
1171 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) |
1172 | kctl.get = snd_ctl_elem_user_get; | |
1173 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
1174 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
1175 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
1176 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
1177 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
1178 | } | |
1da177e4 LT |
1179 | switch (info->type) { |
1180 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
1181 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1182 | private_size = sizeof(long); | |
1183 | if (info->count > 128) | |
1184 | return -EINVAL; | |
1185 | break; | |
1186 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
1187 | private_size = sizeof(long long); | |
1188 | if (info->count > 64) | |
1189 | return -EINVAL; | |
1190 | break; | |
8d448162 CL |
1191 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: |
1192 | private_size = sizeof(unsigned int); | |
1193 | if (info->count > 128 || info->value.enumerated.items == 0) | |
1194 | return -EINVAL; | |
1195 | break; | |
1da177e4 LT |
1196 | case SNDRV_CTL_ELEM_TYPE_BYTES: |
1197 | private_size = sizeof(unsigned char); | |
1198 | if (info->count > 512) | |
1199 | return -EINVAL; | |
1200 | break; | |
1201 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1202 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1203 | if (info->count != 1) |
1204 | return -EINVAL; | |
1205 | break; | |
1206 | default: | |
1207 | return -EINVAL; | |
1208 | } | |
1209 | private_size *= info->count; | |
ca2c0966 | 1210 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1211 | if (ue == NULL) |
1212 | return -ENOMEM; | |
1213 | ue->info = *info; | |
86148e84 | 1214 | ue->info.access = 0; |
1da177e4 LT |
1215 | ue->elem_data = (char *)ue + sizeof(*ue); |
1216 | ue->elem_data_size = private_size; | |
8d448162 CL |
1217 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
1218 | err = snd_ctl_elem_init_enum_names(ue); | |
1219 | if (err < 0) { | |
1220 | kfree(ue); | |
1221 | return err; | |
1222 | } | |
1223 | } | |
1da177e4 LT |
1224 | kctl.private_free = snd_ctl_elem_user_free; |
1225 | _kctl = snd_ctl_new(&kctl, access); | |
1226 | if (_kctl == NULL) { | |
8d448162 | 1227 | kfree(ue->priv_data); |
2fbf182e | 1228 | kfree(ue); |
1da177e4 LT |
1229 | return -ENOMEM; |
1230 | } | |
1231 | _kctl->private_data = ue; | |
1232 | for (idx = 0; idx < _kctl->count; idx++) | |
1233 | _kctl->vd[idx].owner = file; | |
1234 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1235 | if (err < 0) |
1da177e4 | 1236 | return err; |
1da177e4 LT |
1237 | |
1238 | down_write(&card->controls_rwsem); | |
1239 | card->user_ctl_count++; | |
1240 | up_write(&card->controls_rwsem); | |
1241 | ||
1242 | return 0; | |
1243 | } | |
1244 | ||
82e9bae6 TI |
1245 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1246 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1247 | { |
82e9bae6 | 1248 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1249 | if (copy_from_user(&info, _info, sizeof(info))) |
1250 | return -EFAULT; | |
1251 | return snd_ctl_elem_add(file, &info, replace); | |
1252 | } | |
1253 | ||
82e9bae6 TI |
1254 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1255 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1256 | { |
82e9bae6 | 1257 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1258 | |
1259 | if (copy_from_user(&id, _id, sizeof(id))) | |
1260 | return -EFAULT; | |
f217ac59 | 1261 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1262 | } |
1263 | ||
82e9bae6 | 1264 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1265 | { |
1266 | int subscribe; | |
1267 | if (get_user(subscribe, ptr)) | |
1268 | return -EFAULT; | |
1269 | if (subscribe < 0) { | |
1270 | subscribe = file->subscribed; | |
1271 | if (put_user(subscribe, ptr)) | |
1272 | return -EFAULT; | |
1273 | return 0; | |
1274 | } | |
1275 | if (subscribe) { | |
1276 | file->subscribed = 1; | |
1277 | return 0; | |
1278 | } else if (file->subscribed) { | |
1279 | snd_ctl_empty_read_queue(file); | |
1280 | file->subscribed = 0; | |
1281 | } | |
1282 | return 0; | |
1283 | } | |
1284 | ||
8aa9b586 JK |
1285 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1286 | struct snd_ctl_tlv __user *_tlv, | |
1287 | int op_flag) | |
42750b04 | 1288 | { |
8aa9b586 | 1289 | struct snd_card *card = file->card; |
42750b04 JK |
1290 | struct snd_ctl_tlv tlv; |
1291 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1292 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1293 | unsigned int len; |
1294 | int err = 0; | |
1295 | ||
1296 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1297 | return -EFAULT; | |
6123637f | 1298 | if (tlv.length < sizeof(unsigned int) * 2) |
8aa9b586 JK |
1299 | return -EINVAL; |
1300 | down_read(&card->controls_rwsem); | |
1301 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1302 | if (kctl == NULL) { | |
1303 | err = -ENOENT; | |
1304 | goto __kctl_end; | |
1305 | } | |
1306 | if (kctl->tlv.p == NULL) { | |
1307 | err = -ENXIO; | |
1308 | goto __kctl_end; | |
1309 | } | |
1310 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1311 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1312 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1313 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1314 | err = -ENXIO; | |
1315 | goto __kctl_end; | |
1316 | } | |
1317 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
bec145ae | 1318 | if (vd->owner != NULL && vd->owner != file) { |
8aa9b586 JK |
1319 | err = -EPERM; |
1320 | goto __kctl_end; | |
1321 | } | |
bd483d4c | 1322 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); |
8aa9b586 JK |
1323 | if (err > 0) { |
1324 | up_read(&card->controls_rwsem); | |
1325 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1326 | return 0; | |
1327 | } | |
1328 | } else { | |
1329 | if (op_flag) { | |
1330 | err = -ENXIO; | |
1331 | goto __kctl_end; | |
1332 | } | |
1333 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1334 | if (tlv.length < len) { | |
1335 | err = -ENOMEM; | |
1336 | goto __kctl_end; | |
1337 | } | |
1338 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1339 | err = -EFAULT; | |
1340 | } | |
42750b04 | 1341 | __kctl_end: |
8aa9b586 JK |
1342 | up_read(&card->controls_rwsem); |
1343 | return err; | |
42750b04 JK |
1344 | } |
1345 | ||
1da177e4 LT |
1346 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1347 | { | |
82e9bae6 TI |
1348 | struct snd_ctl_file *ctl; |
1349 | struct snd_card *card; | |
82e9bae6 | 1350 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1351 | void __user *argp = (void __user *)arg; |
1352 | int __user *ip = argp; | |
1353 | int err; | |
1354 | ||
1355 | ctl = file->private_data; | |
1356 | card = ctl->card; | |
7eaa943c TI |
1357 | if (snd_BUG_ON(!card)) |
1358 | return -ENXIO; | |
1da177e4 LT |
1359 | switch (cmd) { |
1360 | case SNDRV_CTL_IOCTL_PVERSION: | |
1361 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1362 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1363 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1364 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1365 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1366 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1367 | return snd_ctl_elem_info_user(ctl, argp); | |
1368 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1369 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1370 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1371 | return snd_ctl_elem_write_user(ctl, argp); | |
1372 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1373 | return snd_ctl_elem_lock(ctl, argp); | |
1374 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1375 | return snd_ctl_elem_unlock(ctl, argp); | |
1376 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1377 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1378 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1379 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1380 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1381 | return snd_ctl_elem_remove(ctl, argp); | |
1382 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1383 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 JK |
1384 | case SNDRV_CTL_IOCTL_TLV_READ: |
1385 | return snd_ctl_tlv_ioctl(ctl, argp, 0); | |
1386 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
1387 | return snd_ctl_tlv_ioctl(ctl, argp, 1); | |
1388 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1389 | return snd_ctl_tlv_ioctl(ctl, argp, -1); | |
1da177e4 | 1390 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1391 | return -ENOPROTOOPT; |
1da177e4 LT |
1392 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1393 | #ifdef CONFIG_PM | |
1394 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1395 | #else | |
1396 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1397 | #endif | |
1398 | } | |
1399 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1400 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1401 | err = p->fioctl(card, ctl, cmd, arg); |
1402 | if (err != -ENOIOCTLCMD) { | |
1403 | up_read(&snd_ioctl_rwsem); | |
1404 | return err; | |
1405 | } | |
1406 | } | |
1407 | up_read(&snd_ioctl_rwsem); | |
bb009457 | 1408 | dev_dbg(card->dev, "unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1409 | return -ENOTTY; |
1410 | } | |
1411 | ||
82e9bae6 TI |
1412 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1413 | size_t count, loff_t * offset) | |
1da177e4 | 1414 | { |
82e9bae6 | 1415 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1416 | int err = 0; |
1417 | ssize_t result = 0; | |
1418 | ||
1419 | ctl = file->private_data; | |
7eaa943c TI |
1420 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1421 | return -ENXIO; | |
1da177e4 LT |
1422 | if (!ctl->subscribed) |
1423 | return -EBADFD; | |
82e9bae6 | 1424 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1425 | return -EINVAL; |
1426 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1427 | while (count >= sizeof(struct snd_ctl_event)) { |
1428 | struct snd_ctl_event ev; | |
1429 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1430 | while (list_empty(&ctl->events)) { |
1431 | wait_queue_t wait; | |
1432 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1433 | err = -EAGAIN; | |
1434 | goto __end_lock; | |
1435 | } | |
1436 | init_waitqueue_entry(&wait, current); | |
1437 | add_wait_queue(&ctl->change_sleep, &wait); | |
1438 | set_current_state(TASK_INTERRUPTIBLE); | |
1439 | spin_unlock_irq(&ctl->read_lock); | |
1440 | schedule(); | |
1441 | remove_wait_queue(&ctl->change_sleep, &wait); | |
0914f796 TI |
1442 | if (ctl->card->shutdown) |
1443 | return -ENODEV; | |
1da177e4 | 1444 | if (signal_pending(current)) |
0e5d720c | 1445 | return -ERESTARTSYS; |
1da177e4 LT |
1446 | spin_lock_irq(&ctl->read_lock); |
1447 | } | |
1448 | kev = snd_kctl_event(ctl->events.next); | |
1449 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1450 | ev.data.elem.mask = kev->mask; | |
1451 | ev.data.elem.id = kev->id; | |
1452 | list_del(&kev->list); | |
1453 | spin_unlock_irq(&ctl->read_lock); | |
1454 | kfree(kev); | |
82e9bae6 | 1455 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1456 | err = -EFAULT; |
1457 | goto __end; | |
1458 | } | |
1459 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1460 | buffer += sizeof(struct snd_ctl_event); |
1461 | count -= sizeof(struct snd_ctl_event); | |
1462 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1463 | } |
1464 | __end_lock: | |
1465 | spin_unlock_irq(&ctl->read_lock); | |
1466 | __end: | |
1467 | return result > 0 ? result : err; | |
1468 | } | |
1469 | ||
1470 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1471 | { | |
1472 | unsigned int mask; | |
82e9bae6 | 1473 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1474 | |
1475 | ctl = file->private_data; | |
1476 | if (!ctl->subscribed) | |
1477 | return 0; | |
1478 | poll_wait(file, &ctl->change_sleep, wait); | |
1479 | ||
1480 | mask = 0; | |
1481 | if (!list_empty(&ctl->events)) | |
1482 | mask |= POLLIN | POLLRDNORM; | |
1483 | ||
1484 | return mask; | |
1485 | } | |
1486 | ||
1487 | /* | |
1488 | * register the device-specific control-ioctls. | |
1489 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1490 | */ | |
1491 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1492 | { | |
82e9bae6 | 1493 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1494 | |
82e9bae6 | 1495 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1496 | if (pn == NULL) |
1497 | return -ENOMEM; | |
1498 | pn->fioctl = fcn; | |
1499 | down_write(&snd_ioctl_rwsem); | |
1500 | list_add_tail(&pn->list, lists); | |
1501 | up_write(&snd_ioctl_rwsem); | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1506 | { | |
1507 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1508 | } | |
1509 | ||
c0d3fb39 TI |
1510 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1511 | ||
1da177e4 LT |
1512 | #ifdef CONFIG_COMPAT |
1513 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1514 | { | |
1515 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1516 | } | |
c0d3fb39 TI |
1517 | |
1518 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1519 | #endif |
1520 | ||
1521 | /* | |
1522 | * de-register the device-specific control-ioctls. | |
1523 | */ | |
82e9bae6 TI |
1524 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1525 | struct list_head *lists) | |
1da177e4 | 1526 | { |
82e9bae6 | 1527 | struct snd_kctl_ioctl *p; |
1da177e4 | 1528 | |
7eaa943c TI |
1529 | if (snd_BUG_ON(!fcn)) |
1530 | return -EINVAL; | |
1da177e4 | 1531 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1532 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1533 | if (p->fioctl == fcn) { |
1534 | list_del(&p->list); | |
1535 | up_write(&snd_ioctl_rwsem); | |
1536 | kfree(p); | |
1537 | return 0; | |
1538 | } | |
1539 | } | |
1540 | up_write(&snd_ioctl_rwsem); | |
1541 | snd_BUG(); | |
1542 | return -EINVAL; | |
1543 | } | |
1544 | ||
1545 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1546 | { | |
1547 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1548 | } | |
1549 | ||
c0d3fb39 TI |
1550 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1551 | ||
1da177e4 LT |
1552 | #ifdef CONFIG_COMPAT |
1553 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1554 | { | |
1555 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1556 | } | |
1557 | ||
c0d3fb39 | 1558 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1559 | #endif |
1560 | ||
1561 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1562 | { | |
82e9bae6 | 1563 | struct snd_ctl_file *ctl; |
60aa4924 | 1564 | |
1da177e4 | 1565 | ctl = file->private_data; |
60aa4924 | 1566 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1567 | } |
1568 | ||
1569 | /* | |
1570 | * ioctl32 compat | |
1571 | */ | |
1572 | #ifdef CONFIG_COMPAT | |
1573 | #include "control_compat.c" | |
1574 | #else | |
1575 | #define snd_ctl_ioctl_compat NULL | |
1576 | #endif | |
1577 | ||
1578 | /* | |
1579 | * INIT PART | |
1580 | */ | |
1581 | ||
9c2e08c5 | 1582 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1583 | { |
1584 | .owner = THIS_MODULE, | |
1585 | .read = snd_ctl_read, | |
1586 | .open = snd_ctl_open, | |
1587 | .release = snd_ctl_release, | |
02f4865f | 1588 | .llseek = no_llseek, |
1da177e4 LT |
1589 | .poll = snd_ctl_poll, |
1590 | .unlocked_ioctl = snd_ctl_ioctl, | |
1591 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1592 | .fasync = snd_ctl_fasync, | |
1593 | }; | |
1594 | ||
1da177e4 LT |
1595 | /* |
1596 | * registration of the control device | |
1597 | */ | |
82e9bae6 | 1598 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1599 | { |
82e9bae6 | 1600 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1601 | int err, cardnum; |
1602 | char name[16]; | |
1603 | ||
7eaa943c TI |
1604 | if (snd_BUG_ON(!card)) |
1605 | return -ENXIO; | |
1da177e4 | 1606 | cardnum = card->number; |
7eaa943c TI |
1607 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1608 | return -ENXIO; | |
1da177e4 | 1609 | sprintf(name, "controlC%i", cardnum); |
f87135f5 CL |
1610 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1611 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1612 | return err; |
1613 | return 0; | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * disconnection of the control device | |
1618 | */ | |
82e9bae6 | 1619 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1620 | { |
82e9bae6 | 1621 | struct snd_card *card = device->device_data; |
82e9bae6 | 1622 | struct snd_ctl_file *ctl; |
c461482c TI |
1623 | int err, cardnum; |
1624 | ||
7eaa943c TI |
1625 | if (snd_BUG_ON(!card)) |
1626 | return -ENXIO; | |
c461482c | 1627 | cardnum = card->number; |
7eaa943c TI |
1628 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1629 | return -ENXIO; | |
1da177e4 | 1630 | |
d8009882 | 1631 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1632 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1633 | wake_up(&ctl->change_sleep); |
1634 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1635 | } | |
d8009882 | 1636 | read_unlock(&card->ctl_files_rwlock); |
c461482c TI |
1637 | |
1638 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1639 | card, -1)) < 0) | |
1640 | return err; | |
1da177e4 LT |
1641 | return 0; |
1642 | } | |
1643 | ||
1644 | /* | |
1645 | * free all controls | |
1646 | */ | |
82e9bae6 | 1647 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1648 | { |
82e9bae6 TI |
1649 | struct snd_card *card = device->device_data; |
1650 | struct snd_kcontrol *control; | |
1da177e4 LT |
1651 | |
1652 | down_write(&card->controls_rwsem); | |
1653 | while (!list_empty(&card->controls)) { | |
1654 | control = snd_kcontrol(card->controls.next); | |
1655 | snd_ctl_remove(card, control); | |
1656 | } | |
1657 | up_write(&card->controls_rwsem); | |
1658 | return 0; | |
1659 | } | |
1660 | ||
1da177e4 LT |
1661 | /* |
1662 | * create control core: | |
1663 | * called from init.c | |
1664 | */ | |
82e9bae6 | 1665 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1666 | { |
82e9bae6 | 1667 | static struct snd_device_ops ops = { |
1da177e4 LT |
1668 | .dev_free = snd_ctl_dev_free, |
1669 | .dev_register = snd_ctl_dev_register, | |
1670 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1671 | }; |
1672 | ||
7eaa943c TI |
1673 | if (snd_BUG_ON(!card)) |
1674 | return -ENXIO; | |
1da177e4 LT |
1675 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); |
1676 | } | |
b9ed4f2b TI |
1677 | |
1678 | /* | |
9600732b | 1679 | * Frequently used control callbacks/helpers |
b9ed4f2b TI |
1680 | */ |
1681 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
1682 | struct snd_ctl_elem_info *uinfo) | |
1683 | { | |
1684 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1685 | uinfo->count = 1; | |
1686 | uinfo->value.integer.min = 0; | |
1687 | uinfo->value.integer.max = 1; | |
1688 | return 0; | |
1689 | } | |
1690 | ||
1691 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); | |
1692 | ||
1693 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
1694 | struct snd_ctl_elem_info *uinfo) | |
1695 | { | |
1696 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1697 | uinfo->count = 2; | |
1698 | uinfo->value.integer.min = 0; | |
1699 | uinfo->value.integer.max = 1; | |
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); | |
9600732b CL |
1704 | |
1705 | /** | |
1706 | * snd_ctl_enum_info - fills the info structure for an enumerated control | |
1707 | * @info: the structure to be filled | |
1708 | * @channels: the number of the control's channels; often one | |
1709 | * @items: the number of control values; also the size of @names | |
1710 | * @names: an array containing the names of all control values | |
1711 | * | |
1712 | * Sets all required fields in @info to their appropriate values. | |
1713 | * If the control's accessibility is not the default (readable and writable), | |
1714 | * the caller has to fill @info->access. | |
eb7c06e8 YB |
1715 | * |
1716 | * Return: Zero. | |
9600732b CL |
1717 | */ |
1718 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, | |
1719 | unsigned int items, const char *const names[]) | |
1720 | { | |
1721 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; | |
1722 | info->count = channels; | |
1723 | info->value.enumerated.items = items; | |
1724 | if (info->value.enumerated.item >= items) | |
1725 | info->value.enumerated.item = items - 1; | |
1726 | strlcpy(info->value.enumerated.name, | |
1727 | names[info->value.enumerated.item], | |
1728 | sizeof(info->value.enumerated.name)); | |
1729 | return 0; | |
1730 | } | |
1731 | EXPORT_SYMBOL(snd_ctl_enum_info); |