blob: 9768a3963c8fe5abfc4f3a37af6c4f3a8031323d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Routines for driver control interface
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/threads.h>
23#include <linux/interrupt.h>
Paul Gortmakerda155d52011-07-15 12:38:28 -040024#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#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
Dan Rosenberg5591bf02010-09-28 14:18:20 -040035#define MAX_CONTROL_COUNT 1028
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Takashi Iwai82e9bae2005-11-17 13:53:23 +010037struct snd_kctl_ioctl {
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 struct list_head list; /* list of all ioctls */
39 snd_kctl_ioctl_func_t fioctl;
Takashi Iwai82e9bae2005-11-17 13:53:23 +010040};
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42static DECLARE_RWSEM(snd_ioctl_rwsem);
43static LIST_HEAD(snd_control_ioctls);
44#ifdef CONFIG_COMPAT
45static LIST_HEAD(snd_control_compat_ioctls);
46#endif
47
48static int snd_ctl_open(struct inode *inode, struct file *file)
49{
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 unsigned long flags;
Takashi Iwai82e9bae2005-11-17 13:53:23 +010051 struct snd_card *card;
52 struct snd_ctl_file *ctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 int err;
54
Takashi Iwai02f48652010-04-13 11:49:04 +020055 err = nonseekable_open(inode, file);
56 if (err < 0)
57 return err;
58
Clemens Ladischf87135f2005-11-20 14:06:59 +010059 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 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 }
Takashi Iwaica2c0962005-09-09 14:20:23 +020073 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 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;
Takashi Iwai2529bba2006-08-04 12:57:19 +020082 ctl->prefer_pcm_subdevice = -1;
83 ctl->prefer_rawmidi_subdevice = -1;
Clemens Ladisch25d27ed2009-11-02 09:35:44 +010084 ctl->pid = get_pid(task_pid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 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);
Takashi Iwaia0830db2012-10-16 13:05:59 +020089 snd_card_unref(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 return 0;
91
92 __error:
93 module_put(card->module);
94 __error2:
95 snd_card_file_remove(card, file);
96 __error1:
Takashi Iwaia0830db2012-10-16 13:05:59 +020097 if (card)
98 snd_card_unref(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 return err;
100}
101
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100102static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
Borislav Petkov7507e8d2007-10-22 17:11:09 +0200104 unsigned long flags;
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100105 struct snd_kctl_event *cread;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Borislav Petkov7507e8d2007-10-22 17:11:09 +0200107 spin_lock_irqsave(&ctl->read_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 while (!list_empty(&ctl->events)) {
109 cread = snd_kctl_event(ctl->events.next);
110 list_del(&cread->list);
111 kfree(cread);
112 }
Borislav Petkov7507e8d2007-10-22 17:11:09 +0200113 spin_unlock_irqrestore(&ctl->read_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116static int snd_ctl_release(struct inode *inode, struct file *file)
117{
118 unsigned long flags;
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100119 struct snd_card *card;
120 struct snd_ctl_file *ctl;
121 struct snd_kcontrol *control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 unsigned int idx;
123
124 ctl = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 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);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200131 list_for_each_entry(control, &card->controls, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 for (idx = 0; idx < control->count; idx++)
133 if (control->vd[idx].owner == ctl)
134 control->vd[idx].owner = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 up_write(&card->controls_rwsem);
136 snd_ctl_empty_read_queue(ctl);
Clemens Ladisch25d27ed2009-11-02 09:35:44 +0100137 put_pid(ctl->pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 kfree(ctl);
139 module_put(card->module);
140 snd_card_file_remove(card, file);
141 return 0;
142}
143
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100144void snd_ctl_notify(struct snd_card *card, unsigned int mask,
145 struct snd_ctl_elem_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
147 unsigned long flags;
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100148 struct snd_ctl_file *ctl;
149 struct snd_kctl_event *ev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200151 if (snd_BUG_ON(!card || !id))
152 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 read_lock(&card->ctl_files_rwlock);
154#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
155 card->mixer_oss_change_count++;
156#endif
Johannes Berg9244b2c2006-10-05 16:02:22 +0200157 list_for_each_entry(ctl, &card->ctl_files, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 if (!ctl->subscribed)
159 continue;
160 spin_lock_irqsave(&ctl->read_lock, flags);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200161 list_for_each_entry(ev, &ctl->events, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 if (ev->id.numid == id->numid) {
163 ev->mask |= mask;
164 goto _found;
165 }
166 }
Takashi Iwaica2c0962005-09-09 14:20:23 +0200167 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (ev) {
169 ev->id = *id;
170 ev->mask = mask;
171 list_add_tail(&ev->list, &ctl->events);
172 } else {
173 snd_printk(KERN_ERR "No memory available to allocate event\n");
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
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200183EXPORT_SYMBOL(snd_ctl_notify);
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185/**
186 * snd_ctl_new - create a control instance from the template
187 * @control: the control template
188 * @access: the default control access
189 *
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100190 * Allocates a new struct snd_kcontrol instance and copies the given template
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 * to the new instance. It does not copy volatile data (access).
192 *
193 * Returns the pointer of the new instance, or NULL on failure.
194 */
Adrian Bunk0b51ba02006-11-20 17:50:17 +0100195static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control,
196 unsigned int access)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100198 struct snd_kcontrol *kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 unsigned int idx;
200
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200201 if (snd_BUG_ON(!control || !control->count))
202 return NULL;
Dan Rosenberg5591bf02010-09-28 14:18:20 -0400203
204 if (control->count > MAX_CONTROL_COUNT)
205 return NULL;
206
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100207 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL);
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100208 if (kctl == NULL) {
209 snd_printk(KERN_ERR "Cannot allocate control instance\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return NULL;
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 *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 *
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100223 * Allocates a new struct snd_kcontrol instance and initialize from the given
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 * 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 *
227 * Returns the pointer of the newly generated instance, or NULL on failure.
228 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100229struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
230 void *private_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100232 struct snd_kcontrol kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 unsigned int access;
234
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200235 if (snd_BUG_ON(!ncontrol || !ncontrol->info))
236 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 memset(&kctl, 0, sizeof(kctl));
238 kctl.id.iface = ncontrol->iface;
239 kctl.id.device = ncontrol->device;
240 kctl.id.subdevice = ncontrol->subdevice;
Mark Brown366840d2008-10-29 14:40:30 +0000241 if (ncontrol->name) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name));
Mark Brown366840d2008-10-29 14:40:30 +0000243 if (strcmp(ncontrol->name, kctl.id.name) != 0)
244 snd_printk(KERN_WARNING
245 "Control name '%s' truncated to '%s'\n",
246 ncontrol->name, kctl.id.name);
247 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 kctl.id.index = ncontrol->index;
249 kctl.count = ncontrol->count ? ncontrol->count : 1;
250 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +0200251 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
Takashi Iwaia8d372f2012-07-30 13:47:07 +0200252 SNDRV_CTL_ELEM_ACCESS_VOLATILE|
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +0200253 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
Clemens Ladischa75d7a42010-02-01 13:29:50 +0100254 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
255 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND|
256 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 kctl.info = ncontrol->info;
258 kctl.get = ncontrol->get;
259 kctl.put = ncontrol->put;
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +0200260 kctl.tlv.p = ncontrol->tlv.p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 kctl.private_value = ncontrol->private_value;
262 kctl.private_data = private_data;
263 return snd_ctl_new(&kctl, access);
264}
265
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200266EXPORT_SYMBOL(snd_ctl_new1);
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268/**
269 * snd_ctl_free_one - release the control instance
270 * @kcontrol: the control instance
271 *
272 * Releases the control instance created via snd_ctl_new()
273 * or snd_ctl_new1().
274 * Don't call this after the control was added to the card.
275 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100276void snd_ctl_free_one(struct snd_kcontrol *kcontrol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
278 if (kcontrol) {
279 if (kcontrol->private_free)
280 kcontrol->private_free(kcontrol);
281 kfree(kcontrol);
282 }
283}
284
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200285EXPORT_SYMBOL(snd_ctl_free_one);
286
Clemens Ladisch0e82e5f2011-03-07 13:24:30 +0100287static bool snd_ctl_remove_numid_conflict(struct snd_card *card,
288 unsigned int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100290 struct snd_kcontrol *kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Johannes Berg9244b2c2006-10-05 16:02:22 +0200292 list_for_each_entry(kctl, &card->controls, list) {
Clemens Ladisch7c733582011-03-07 13:22:50 +0100293 if (kctl->id.numid < card->last_numid + 1 + count &&
Clemens Ladisch0e82e5f2011-03-07 13:24:30 +0100294 kctl->id.numid + kctl->count > card->last_numid + 1) {
295 card->last_numid = kctl->id.numid + kctl->count - 1;
296 return true;
297 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 }
Clemens Ladisch0e82e5f2011-03-07 13:24:30 +0100299 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100302static int snd_ctl_find_hole(struct snd_card *card, unsigned int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
Clemens Ladisch0e82e5f2011-03-07 13:24:30 +0100304 unsigned int iter = 100000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Clemens Ladisch0e82e5f2011-03-07 13:24:30 +0100306 while (snd_ctl_remove_numid_conflict(card, count)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 if (--iter == 0) {
308 /* this situation is very unlikely */
309 snd_printk(KERN_ERR "unable to allocate new control numid\n");
310 return -ENOMEM;
311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
313 return 0;
314}
315
316/**
317 * snd_ctl_add - add the control instance to the card
318 * @card: the card instance
319 * @kcontrol: the control instance to add
320 *
321 * Adds the control instance created via snd_ctl_new() or
322 * snd_ctl_new1() to the given card. Assigns also an unique
323 * numid used for fast search.
324 *
325 * Returns zero if successful, or a negative error code on failure.
326 *
327 * It frees automatically the control which cannot be added.
328 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100329int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100331 struct snd_ctl_elem_id id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 unsigned int idx;
Takashi Iwaic6077b32006-03-21 16:07:13 +0100333 int err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100335 if (! kcontrol)
Takashi Iwaic6077b32006-03-21 16:07:13 +0100336 return err;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200337 if (snd_BUG_ON(!card || !kcontrol->info))
338 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 id = kcontrol->id;
340 down_write(&card->controls_rwsem);
341 if (snd_ctl_find_id(card, &id)) {
342 up_write(&card->controls_rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n",
344 id.iface,
345 id.device,
346 id.subdevice,
347 id.name,
348 id.index);
Takashi Iwaic6077b32006-03-21 16:07:13 +0100349 err = -EBUSY;
350 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
352 if (snd_ctl_find_hole(card, kcontrol->count) < 0) {
353 up_write(&card->controls_rwsem);
Takashi Iwaic6077b32006-03-21 16:07:13 +0100354 err = -ENOMEM;
355 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 }
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;
Takashi Iwaic6077b32006-03-21 16:07:13 +0100365
366 error:
367 snd_ctl_free_one(kcontrol);
368 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369}
370
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200371EXPORT_SYMBOL(snd_ctl_add);
372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373/**
Dimitris Papastamos66b5b972011-03-16 12:16:39 +0000374 * 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 *
383 * Returns zero if successful, or a negative error code on failure.
384 *
385 * It frees automatically the control which cannot be added or replaced.
386 */
387int 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 }
416add:
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
431error:
432 snd_ctl_free_one(kcontrol);
433 return ret;
434}
435EXPORT_SYMBOL(snd_ctl_replace);
436
437/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 * 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).
445 *
446 * Returns 0 if successful, or a negative error code on failure.
447 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100448int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100450 struct snd_ctl_elem_id id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 unsigned int idx;
452
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200453 if (snd_BUG_ON(!card || !kcontrol))
454 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 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
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200464EXPORT_SYMBOL(snd_ctl_remove);
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466/**
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.
473 *
474 * Returns 0 if successful, or a negative error code on failure.
475 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100476int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100478 struct snd_kcontrol *kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 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
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200492EXPORT_SYMBOL(snd_ctl_remove_id);
493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494/**
Clemens Ladischf217ac52009-08-17 12:27:22 +0200495 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 * @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.
501 *
502 * Returns 0 if successful, or a negative error code on failure.
503 */
Clemens Ladischf217ac52009-08-17 12:27:22 +0200504static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
505 struct snd_ctl_elem_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100507 struct snd_card *card = file->card;
508 struct snd_kcontrol *kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 int idx, ret;
510
511 down_write(&card->controls_rwsem);
512 kctl = snd_ctl_find_id(card, id);
513 if (kctl == NULL) {
Clemens Ladisch317b8082009-08-17 12:26:34 +0200514 ret = -ENOENT;
515 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
Clemens Ladisch18dd0aa2009-08-17 12:28:09 +0200517 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
518 ret = -EINVAL;
519 goto error;
520 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 for (idx = 0; idx < kctl->count; idx++)
522 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
Clemens Ladisch317b8082009-08-17 12:26:34 +0200523 ret = -EBUSY;
524 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 }
526 ret = snd_ctl_remove(card, kctl);
Clemens Ladischf217ac52009-08-17 12:27:22 +0200527 if (ret < 0)
528 goto error;
529 card->user_ctl_count--;
Clemens Ladisch317b8082009-08-17 12:26:34 +0200530error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 up_write(&card->controls_rwsem);
532 return ret;
533}
534
535/**
Takashi Iwai3cbdd752008-08-29 16:09:01 +0200536 * 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 *
544 * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
545 */
546int 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}
579EXPORT_SYMBOL_GPL(snd_ctl_activate_id);
580
581/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 * 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 *
590 * Returns zero if successful, or a negative error code on failure.
591 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100592int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
593 struct snd_ctl_elem_id *dst_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100595 struct snd_kcontrol *kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
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
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200610EXPORT_SYMBOL(snd_ctl_rename_id);
611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612/**
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 *
619 * Returns the pointer of the instance if found, or NULL if not.
620 *
621 * The caller must down card->controls_rwsem before calling this function
622 * (if the race condition can happen).
623 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100624struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100626 struct snd_kcontrol *kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200628 if (snd_BUG_ON(!card || !numid))
629 return NULL;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200630 list_for_each_entry(kctl, &card->controls, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid)
632 return kctl;
633 }
634 return NULL;
635}
636
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200637EXPORT_SYMBOL(snd_ctl_find_numid);
638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639/**
640 * snd_ctl_find_id - find the control instance with the given id
641 * @card: the card instance
642 * @id: the id to search
643 *
644 * Finds the control instance with the given id from the card.
645 *
646 * Returns the pointer of the instance if found, or NULL if not.
647 *
648 * The caller must down card->controls_rwsem before calling this function
649 * (if the race condition can happen).
650 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100651struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
652 struct snd_ctl_elem_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100654 struct snd_kcontrol *kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200656 if (snd_BUG_ON(!card || !id))
657 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 if (id->numid != 0)
659 return snd_ctl_find_numid(card, id->numid);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200660 list_for_each_entry(kctl, &card->controls, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 if (kctl->id.iface != id->iface)
662 continue;
663 if (kctl->id.device != id->device)
664 continue;
665 if (kctl->id.subdevice != id->subdevice)
666 continue;
667 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name)))
668 continue;
669 if (kctl->id.index > id->index)
670 continue;
671 if (kctl->id.index + kctl->count <= id->index)
672 continue;
673 return kctl;
674 }
675 return NULL;
676}
677
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200678EXPORT_SYMBOL(snd_ctl_find_id);
679
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100680static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 unsigned int cmd, void __user *arg)
682{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100683 struct snd_ctl_card_info *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
Takashi Iwaica2c0962005-09-09 14:20:23 +0200685 info = kzalloc(sizeof(*info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 if (! info)
687 return -ENOMEM;
688 down_read(&snd_ioctl_rwsem);
689 info->card = card->number;
690 strlcpy(info->id, card->id, sizeof(info->id));
691 strlcpy(info->driver, card->driver, sizeof(info->driver));
692 strlcpy(info->name, card->shortname, sizeof(info->name));
693 strlcpy(info->longname, card->longname, sizeof(info->longname));
694 strlcpy(info->mixername, card->mixername, sizeof(info->mixername));
695 strlcpy(info->components, card->components, sizeof(info->components));
696 up_read(&snd_ioctl_rwsem);
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100697 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 kfree(info);
699 return -EFAULT;
700 }
701 kfree(info);
702 return 0;
703}
704
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100705static int snd_ctl_elem_list(struct snd_card *card,
706 struct snd_ctl_elem_list __user *_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707{
708 struct list_head *plist;
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100709 struct snd_ctl_elem_list list;
710 struct snd_kcontrol *kctl;
711 struct snd_ctl_elem_id *dst, *id;
Luca Tettamanti78fa2c42011-05-25 22:43:27 +0200712 unsigned int offset, space, jidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
714 if (copy_from_user(&list, _list, sizeof(list)))
715 return -EFAULT;
716 offset = list.offset;
717 space = list.space;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 /* try limit maximum space */
719 if (space > 16384)
720 return -ENOMEM;
721 if (space > 0) {
722 /* allocate temporary buffer for atomic operation */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100723 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 if (dst == NULL)
725 return -ENOMEM;
726 down_read(&card->controls_rwsem);
727 list.count = card->controls_count;
728 plist = card->controls.next;
729 while (plist != &card->controls) {
730 if (offset == 0)
731 break;
732 kctl = snd_kcontrol(plist);
733 if (offset < kctl->count)
734 break;
735 offset -= kctl->count;
736 plist = plist->next;
737 }
738 list.used = 0;
739 id = dst;
740 while (space > 0 && plist != &card->controls) {
741 kctl = snd_kcontrol(plist);
742 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) {
743 snd_ctl_build_ioff(id, kctl, jidx);
744 id++;
745 space--;
746 list.used++;
747 }
748 plist = plist->next;
749 offset = 0;
750 }
751 up_read(&card->controls_rwsem);
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100752 if (list.used > 0 &&
753 copy_to_user(list.pids, dst,
754 list.used * sizeof(struct snd_ctl_elem_id))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 vfree(dst);
756 return -EFAULT;
757 }
758 vfree(dst);
759 } else {
760 down_read(&card->controls_rwsem);
761 list.count = card->controls_count;
762 up_read(&card->controls_rwsem);
763 }
764 if (copy_to_user(_list, &list, sizeof(list)))
765 return -EFAULT;
766 return 0;
767}
768
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100769static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
770 struct snd_ctl_elem_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100772 struct snd_card *card = ctl->card;
773 struct snd_kcontrol *kctl;
774 struct snd_kcontrol_volatile *vd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 unsigned int index_offset;
776 int result;
777
778 down_read(&card->controls_rwsem);
779 kctl = snd_ctl_find_id(card, &info->id);
780 if (kctl == NULL) {
781 up_read(&card->controls_rwsem);
782 return -ENOENT;
783 }
784#ifdef CONFIG_SND_DEBUG
785 info->access = 0;
786#endif
787 result = kctl->info(kctl, info);
788 if (result >= 0) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200789 snd_BUG_ON(info->access);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 index_offset = snd_ctl_get_ioff(kctl, &info->id);
791 vd = &kctl->vd[index_offset];
792 snd_ctl_build_ioff(&info->id, kctl, index_offset);
793 info->access = vd->access;
794 if (vd->owner) {
795 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
796 if (vd->owner == ctl)
797 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
Clemens Ladisch25d27ed2009-11-02 09:35:44 +0100798 info->owner = pid_vnr(vd->owner->pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 } else {
800 info->owner = -1;
801 }
802 }
803 up_read(&card->controls_rwsem);
804 return result;
805}
806
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100807static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
808 struct snd_ctl_elem_info __user *_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100810 struct snd_ctl_elem_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 int result;
812
813 if (copy_from_user(&info, _info, sizeof(info)))
814 return -EFAULT;
Giuliano Pochini64649402006-03-13 14:11:11 +0100815 snd_power_lock(ctl->card);
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200816 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
Giuliano Pochini64649402006-03-13 14:11:11 +0100817 if (result >= 0)
818 result = snd_ctl_elem_info(ctl, &info);
819 snd_power_unlock(ctl->card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 if (result >= 0)
821 if (copy_to_user(_info, &info, sizeof(info)))
822 return -EFAULT;
823 return result;
824}
825
Takashi Iwaid3bd67c2008-06-12 18:17:26 +0200826static int snd_ctl_elem_read(struct snd_card *card,
827 struct snd_ctl_elem_value *control)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100829 struct snd_kcontrol *kctl;
830 struct snd_kcontrol_volatile *vd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 unsigned int index_offset;
Takashi Iwai8ace4f32008-01-08 17:57:26 +0100832 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
834 down_read(&card->controls_rwsem);
835 kctl = snd_ctl_find_id(card, &control->id);
836 if (kctl == NULL) {
837 result = -ENOENT;
838 } else {
839 index_offset = snd_ctl_get_ioff(kctl, &control->id);
840 vd = &kctl->vd[index_offset];
Takashi Iwai8ace4f32008-01-08 17:57:26 +0100841 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) &&
842 kctl->get != NULL) {
843 snd_ctl_build_ioff(&control->id, kctl, index_offset);
844 result = kctl->get(kctl, control);
845 } else
846 result = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 }
848 up_read(&card->controls_rwsem);
849 return result;
850}
851
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100852static int snd_ctl_elem_read_user(struct snd_card *card,
853 struct snd_ctl_elem_value __user *_control)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100855 struct snd_ctl_elem_value *control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 int result;
Li Zefanef44a1e2009-04-10 09:43:08 +0800857
858 control = memdup_user(_control, sizeof(*control));
859 if (IS_ERR(control))
860 return PTR_ERR(control);
861
Giuliano Pochini64649402006-03-13 14:11:11 +0100862 snd_power_lock(card);
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200863 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
Giuliano Pochini64649402006-03-13 14:11:11 +0100864 if (result >= 0)
865 result = snd_ctl_elem_read(card, control);
866 snd_power_unlock(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 if (result >= 0)
868 if (copy_to_user(_control, control, sizeof(*control)))
869 result = -EFAULT;
870 kfree(control);
871 return result;
872}
873
Takashi Iwaid3bd67c2008-06-12 18:17:26 +0200874static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
875 struct snd_ctl_elem_value *control)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100877 struct snd_kcontrol *kctl;
878 struct snd_kcontrol_volatile *vd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 unsigned int index_offset;
Takashi Iwai8ace4f32008-01-08 17:57:26 +0100880 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
882 down_read(&card->controls_rwsem);
883 kctl = snd_ctl_find_id(card, &control->id);
884 if (kctl == NULL) {
885 result = -ENOENT;
886 } else {
887 index_offset = snd_ctl_get_ioff(kctl, &control->id);
888 vd = &kctl->vd[index_offset];
Takashi Iwai8ace4f32008-01-08 17:57:26 +0100889 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ||
890 kctl->put == NULL ||
891 (file && vd->owner && vd->owner != file)) {
892 result = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 } else {
Takashi Iwai8ace4f32008-01-08 17:57:26 +0100894 snd_ctl_build_ioff(&control->id, kctl, index_offset);
895 result = kctl->put(kctl, control);
896 }
897 if (result > 0) {
898 up_read(&card->controls_rwsem);
899 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
900 &control->id);
901 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 }
903 }
904 up_read(&card->controls_rwsem);
905 return result;
906}
907
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100908static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
909 struct snd_ctl_elem_value __user *_control)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100911 struct snd_ctl_elem_value *control;
Giuliano Pochini64649402006-03-13 14:11:11 +0100912 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 int result;
914
Li Zefanef44a1e2009-04-10 09:43:08 +0800915 control = memdup_user(_control, sizeof(*control));
916 if (IS_ERR(control))
917 return PTR_ERR(control);
918
Giuliano Pochini64649402006-03-13 14:11:11 +0100919 card = file->card;
920 snd_power_lock(card);
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200921 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
Giuliano Pochini64649402006-03-13 14:11:11 +0100922 if (result >= 0)
923 result = snd_ctl_elem_write(card, file, control);
924 snd_power_unlock(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 if (result >= 0)
926 if (copy_to_user(_control, control, sizeof(*control)))
927 result = -EFAULT;
928 kfree(control);
929 return result;
930}
931
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100932static int snd_ctl_elem_lock(struct snd_ctl_file *file,
933 struct snd_ctl_elem_id __user *_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100935 struct snd_card *card = file->card;
936 struct snd_ctl_elem_id id;
937 struct snd_kcontrol *kctl;
938 struct snd_kcontrol_volatile *vd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 int result;
940
941 if (copy_from_user(&id, _id, sizeof(id)))
942 return -EFAULT;
943 down_write(&card->controls_rwsem);
944 kctl = snd_ctl_find_id(card, &id);
945 if (kctl == NULL) {
946 result = -ENOENT;
947 } else {
948 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
949 if (vd->owner != NULL)
950 result = -EBUSY;
951 else {
952 vd->owner = file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 result = 0;
954 }
955 }
956 up_write(&card->controls_rwsem);
957 return result;
958}
959
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100960static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
961 struct snd_ctl_elem_id __user *_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100963 struct snd_card *card = file->card;
964 struct snd_ctl_elem_id id;
965 struct snd_kcontrol *kctl;
966 struct snd_kcontrol_volatile *vd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 int result;
968
969 if (copy_from_user(&id, _id, sizeof(id)))
970 return -EFAULT;
971 down_write(&card->controls_rwsem);
972 kctl = snd_ctl_find_id(card, &id);
973 if (kctl == NULL) {
974 result = -ENOENT;
975 } else {
976 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
977 if (vd->owner == NULL)
978 result = -EINVAL;
979 else if (vd->owner != file)
980 result = -EPERM;
981 else {
982 vd->owner = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 result = 0;
984 }
985 }
986 up_write(&card->controls_rwsem);
987 return result;
988}
989
990struct user_element {
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100991 struct snd_ctl_elem_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 void *elem_data; /* element data */
993 unsigned long elem_data_size; /* size of element data in bytes */
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +0200994 void *tlv_data; /* TLV data */
995 unsigned long tlv_data_size; /* TLV data size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 void *priv_data; /* private data (like strings for enumerated type) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997};
998
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100999static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol,
1000 struct snd_ctl_elem_info *uinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
1002 struct user_element *ue = kcontrol->private_data;
1003
1004 *uinfo = ue->info;
1005 return 0;
1006}
1007
Clemens Ladisch8d448162011-10-07 22:38:59 +02001008static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol,
1009 struct snd_ctl_elem_info *uinfo)
1010{
1011 struct user_element *ue = kcontrol->private_data;
1012 const char *names;
1013 unsigned int item;
1014
1015 item = uinfo->value.enumerated.item;
1016
1017 *uinfo = ue->info;
1018
1019 item = min(item, uinfo->value.enumerated.items - 1);
1020 uinfo->value.enumerated.item = item;
1021
1022 names = ue->priv_data;
1023 for (; item > 0; --item)
1024 names += strlen(names) + 1;
1025 strcpy(uinfo->value.enumerated.name, names);
1026
1027 return 0;
1028}
1029
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001030static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol,
1031 struct snd_ctl_elem_value *ucontrol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032{
1033 struct user_element *ue = kcontrol->private_data;
1034
1035 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size);
1036 return 0;
1037}
1038
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001039static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
1040 struct snd_ctl_elem_value *ucontrol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041{
1042 int change;
1043 struct user_element *ue = kcontrol->private_data;
1044
1045 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0;
1046 if (change)
1047 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size);
1048 return change;
1049}
1050
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001051static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
1052 int op_flag,
1053 unsigned int size,
1054 unsigned int __user *tlv)
1055{
1056 struct user_element *ue = kcontrol->private_data;
1057 int change = 0;
1058 void *new_data;
1059
1060 if (op_flag > 0) {
1061 if (size > 1024 * 128) /* sane value */
1062 return -EINVAL;
Li Zefanef44a1e2009-04-10 09:43:08 +08001063
1064 new_data = memdup_user(tlv, size);
1065 if (IS_ERR(new_data))
1066 return PTR_ERR(new_data);
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001067 change = ue->tlv_data_size != size;
1068 if (!change)
1069 change = memcmp(ue->tlv_data, new_data, size);
1070 kfree(ue->tlv_data);
1071 ue->tlv_data = new_data;
1072 ue->tlv_data_size = size;
1073 } else {
Takashi Iwai18c1c3f2006-08-25 11:39:34 +02001074 if (! ue->tlv_data_size || ! ue->tlv_data)
1075 return -ENXIO;
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001076 if (size < ue->tlv_data_size)
1077 return -ENOSPC;
1078 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
1079 return -EFAULT;
1080 }
1081 return change;
1082}
1083
Clemens Ladisch8d448162011-10-07 22:38:59 +02001084static int snd_ctl_elem_init_enum_names(struct user_element *ue)
1085{
1086 char *names, *p;
1087 size_t buf_len, name_len;
1088 unsigned int i;
Olof Johansson447c6f92011-11-05 22:51:54 +01001089 const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr;
Clemens Ladisch8d448162011-10-07 22:38:59 +02001090
1091 if (ue->info.value.enumerated.names_length > 64 * 1024)
1092 return -EINVAL;
1093
Olof Johansson447c6f92011-11-05 22:51:54 +01001094 names = memdup_user((const void __user *)user_ptrval,
Clemens Ladisch8d448162011-10-07 22:38:59 +02001095 ue->info.value.enumerated.names_length);
1096 if (IS_ERR(names))
1097 return PTR_ERR(names);
1098
1099 /* check that there are enough valid names */
1100 buf_len = ue->info.value.enumerated.names_length;
1101 p = names;
1102 for (i = 0; i < ue->info.value.enumerated.items; ++i) {
1103 name_len = strnlen(p, buf_len);
1104 if (name_len == 0 || name_len >= 64 || name_len == buf_len) {
1105 kfree(names);
1106 return -EINVAL;
1107 }
1108 p += name_len + 1;
1109 buf_len -= name_len + 1;
1110 }
1111
1112 ue->priv_data = names;
1113 ue->info.value.enumerated.names_ptr = 0;
1114
1115 return 0;
1116}
1117
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001118static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119{
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001120 struct user_element *ue = kcontrol->private_data;
Clemens Ladisch8d448162011-10-07 22:38:59 +02001121
1122 kfree(ue->tlv_data);
1123 kfree(ue->priv_data);
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001124 kfree(ue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125}
1126
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001127static int snd_ctl_elem_add(struct snd_ctl_file *file,
1128 struct snd_ctl_elem_info *info, int replace)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001130 struct snd_card *card = file->card;
1131 struct snd_kcontrol kctl, *_kctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 unsigned int access;
1133 long private_size;
1134 struct user_element *ue;
1135 int idx, err;
Lu Guanqun983929c2011-08-24 11:12:34 +08001136
Lu Guanqun08ede032011-08-24 14:45:10 +08001137 if (!replace && card->user_ctl_count >= MAX_USER_CONTROLS)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 return -ENOMEM;
Clemens Ladisch2a031ae2009-08-17 12:25:52 +02001139 if (info->count < 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 return -EINVAL;
1141 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001142 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001143 SNDRV_CTL_ELEM_ACCESS_INACTIVE|
1144 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 info->id.numid = 0;
1146 memset(&kctl, 0, sizeof(kctl));
1147 down_write(&card->controls_rwsem);
1148 _kctl = snd_ctl_find_id(card, &info->id);
1149 err = 0;
1150 if (_kctl) {
1151 if (replace)
1152 err = snd_ctl_remove(card, _kctl);
1153 else
1154 err = -EBUSY;
1155 } else {
1156 if (replace)
1157 err = -ENOENT;
1158 }
1159 up_write(&card->controls_rwsem);
1160 if (err < 0)
1161 return err;
1162 memcpy(&kctl.id, &info->id, sizeof(info->id));
1163 kctl.count = info->owner ? info->owner : 1;
1164 access |= SNDRV_CTL_ELEM_ACCESS_USER;
Clemens Ladisch8d448162011-10-07 22:38:59 +02001165 if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED)
1166 kctl.info = snd_ctl_elem_user_enum_info;
1167 else
1168 kctl.info = snd_ctl_elem_user_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 if (access & SNDRV_CTL_ELEM_ACCESS_READ)
1170 kctl.get = snd_ctl_elem_user_get;
1171 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
1172 kctl.put = snd_ctl_elem_user_put;
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001173 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
1174 kctl.tlv.c = snd_ctl_elem_user_tlv;
1175 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 switch (info->type) {
1178 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 case SNDRV_CTL_ELEM_TYPE_INTEGER:
1180 private_size = sizeof(long);
1181 if (info->count > 128)
1182 return -EINVAL;
1183 break;
1184 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
1185 private_size = sizeof(long long);
1186 if (info->count > 64)
1187 return -EINVAL;
1188 break;
Clemens Ladisch8d448162011-10-07 22:38:59 +02001189 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
1190 private_size = sizeof(unsigned int);
1191 if (info->count > 128 || info->value.enumerated.items == 0)
1192 return -EINVAL;
1193 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 case SNDRV_CTL_ELEM_TYPE_BYTES:
1195 private_size = sizeof(unsigned char);
1196 if (info->count > 512)
1197 return -EINVAL;
1198 break;
1199 case SNDRV_CTL_ELEM_TYPE_IEC958:
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001200 private_size = sizeof(struct snd_aes_iec958);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 if (info->count != 1)
1202 return -EINVAL;
1203 break;
1204 default:
1205 return -EINVAL;
1206 }
1207 private_size *= info->count;
Takashi Iwaica2c0962005-09-09 14:20:23 +02001208 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 if (ue == NULL)
1210 return -ENOMEM;
1211 ue->info = *info;
Takashi Iwai86148e82006-08-24 12:36:36 +02001212 ue->info.access = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 ue->elem_data = (char *)ue + sizeof(*ue);
1214 ue->elem_data_size = private_size;
Clemens Ladisch8d448162011-10-07 22:38:59 +02001215 if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
1216 err = snd_ctl_elem_init_enum_names(ue);
1217 if (err < 0) {
1218 kfree(ue);
1219 return err;
1220 }
1221 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 kctl.private_free = snd_ctl_elem_user_free;
1223 _kctl = snd_ctl_new(&kctl, access);
1224 if (_kctl == NULL) {
Clemens Ladisch8d448162011-10-07 22:38:59 +02001225 kfree(ue->priv_data);
Takashi Iwai2fbf1822006-03-06 15:42:51 -08001226 kfree(ue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 return -ENOMEM;
1228 }
1229 _kctl->private_data = ue;
1230 for (idx = 0; idx < _kctl->count; idx++)
1231 _kctl->vd[idx].owner = file;
1232 err = snd_ctl_add(card, _kctl);
Takashi Iwai2fbf1822006-03-06 15:42:51 -08001233 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
1236 down_write(&card->controls_rwsem);
1237 card->user_ctl_count++;
1238 up_write(&card->controls_rwsem);
1239
1240 return 0;
1241}
1242
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001243static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
1244 struct snd_ctl_elem_info __user *_info, int replace)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001246 struct snd_ctl_elem_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 if (copy_from_user(&info, _info, sizeof(info)))
1248 return -EFAULT;
1249 return snd_ctl_elem_add(file, &info, replace);
1250}
1251
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001252static int snd_ctl_elem_remove(struct snd_ctl_file *file,
1253 struct snd_ctl_elem_id __user *_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001255 struct snd_ctl_elem_id id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
1257 if (copy_from_user(&id, _id, sizeof(id)))
1258 return -EFAULT;
Clemens Ladischf217ac52009-08-17 12:27:22 +02001259 return snd_ctl_remove_user_ctl(file, &id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260}
1261
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001262static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263{
1264 int subscribe;
1265 if (get_user(subscribe, ptr))
1266 return -EFAULT;
1267 if (subscribe < 0) {
1268 subscribe = file->subscribed;
1269 if (put_user(subscribe, ptr))
1270 return -EFAULT;
1271 return 0;
1272 }
1273 if (subscribe) {
1274 file->subscribed = 1;
1275 return 0;
1276 } else if (file->subscribed) {
1277 snd_ctl_empty_read_queue(file);
1278 file->subscribed = 0;
1279 }
1280 return 0;
1281}
1282
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001283static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
1284 struct snd_ctl_tlv __user *_tlv,
1285 int op_flag)
Jaroslav Kysela42750b02006-06-01 18:34:01 +02001286{
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001287 struct snd_card *card = file->card;
Jaroslav Kysela42750b02006-06-01 18:34:01 +02001288 struct snd_ctl_tlv tlv;
1289 struct snd_kcontrol *kctl;
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001290 struct snd_kcontrol_volatile *vd;
Jaroslav Kysela42750b02006-06-01 18:34:01 +02001291 unsigned int len;
1292 int err = 0;
1293
1294 if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
1295 return -EFAULT;
Clemens Ladisch61236372010-02-01 13:30:56 +01001296 if (tlv.length < sizeof(unsigned int) * 2)
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001297 return -EINVAL;
1298 down_read(&card->controls_rwsem);
1299 kctl = snd_ctl_find_numid(card, tlv.numid);
1300 if (kctl == NULL) {
1301 err = -ENOENT;
1302 goto __kctl_end;
1303 }
1304 if (kctl->tlv.p == NULL) {
1305 err = -ENXIO;
1306 goto __kctl_end;
1307 }
1308 vd = &kctl->vd[tlv.numid - kctl->id.numid];
1309 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
1310 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
1311 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
1312 err = -ENXIO;
1313 goto __kctl_end;
1314 }
1315 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
Dan Carpenterbec145a2009-11-18 10:31:57 +02001316 if (vd->owner != NULL && vd->owner != file) {
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001317 err = -EPERM;
1318 goto __kctl_end;
1319 }
Jeffrin Josebd483d42012-03-07 22:57:39 +05301320 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001321 if (err > 0) {
1322 up_read(&card->controls_rwsem);
1323 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
1324 return 0;
1325 }
1326 } else {
1327 if (op_flag) {
1328 err = -ENXIO;
1329 goto __kctl_end;
1330 }
1331 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
1332 if (tlv.length < len) {
1333 err = -ENOMEM;
1334 goto __kctl_end;
1335 }
1336 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
1337 err = -EFAULT;
1338 }
Jaroslav Kysela42750b02006-06-01 18:34:01 +02001339 __kctl_end:
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001340 up_read(&card->controls_rwsem);
1341 return err;
Jaroslav Kysela42750b02006-06-01 18:34:01 +02001342}
1343
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1345{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001346 struct snd_ctl_file *ctl;
1347 struct snd_card *card;
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001348 struct snd_kctl_ioctl *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 void __user *argp = (void __user *)arg;
1350 int __user *ip = argp;
1351 int err;
1352
1353 ctl = file->private_data;
1354 card = ctl->card;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001355 if (snd_BUG_ON(!card))
1356 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 switch (cmd) {
1358 case SNDRV_CTL_IOCTL_PVERSION:
1359 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0;
1360 case SNDRV_CTL_IOCTL_CARD_INFO:
1361 return snd_ctl_card_info(card, ctl, cmd, argp);
1362 case SNDRV_CTL_IOCTL_ELEM_LIST:
Jaroslav Kysela42750b02006-06-01 18:34:01 +02001363 return snd_ctl_elem_list(card, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 case SNDRV_CTL_IOCTL_ELEM_INFO:
1365 return snd_ctl_elem_info_user(ctl, argp);
1366 case SNDRV_CTL_IOCTL_ELEM_READ:
Jaroslav Kysela42750b02006-06-01 18:34:01 +02001367 return snd_ctl_elem_read_user(card, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 case SNDRV_CTL_IOCTL_ELEM_WRITE:
1369 return snd_ctl_elem_write_user(ctl, argp);
1370 case SNDRV_CTL_IOCTL_ELEM_LOCK:
1371 return snd_ctl_elem_lock(ctl, argp);
1372 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
1373 return snd_ctl_elem_unlock(ctl, argp);
1374 case SNDRV_CTL_IOCTL_ELEM_ADD:
1375 return snd_ctl_elem_add_user(ctl, argp, 0);
1376 case SNDRV_CTL_IOCTL_ELEM_REPLACE:
1377 return snd_ctl_elem_add_user(ctl, argp, 1);
1378 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
1379 return snd_ctl_elem_remove(ctl, argp);
1380 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
1381 return snd_ctl_subscribe_events(ctl, ip);
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +02001382 case SNDRV_CTL_IOCTL_TLV_READ:
1383 return snd_ctl_tlv_ioctl(ctl, argp, 0);
1384 case SNDRV_CTL_IOCTL_TLV_WRITE:
1385 return snd_ctl_tlv_ioctl(ctl, argp, 1);
1386 case SNDRV_CTL_IOCTL_TLV_COMMAND:
1387 return snd_ctl_tlv_ioctl(ctl, argp, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 case SNDRV_CTL_IOCTL_POWER:
Takashi Iwaia381a7a2005-11-17 15:55:49 +01001389 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 case SNDRV_CTL_IOCTL_POWER_STATE:
1391#ifdef CONFIG_PM
1392 return put_user(card->power_state, ip) ? -EFAULT : 0;
1393#else
1394 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
1395#endif
1396 }
1397 down_read(&snd_ioctl_rwsem);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001398 list_for_each_entry(p, &snd_control_ioctls, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 err = p->fioctl(card, ctl, cmd, arg);
1400 if (err != -ENOIOCTLCMD) {
1401 up_read(&snd_ioctl_rwsem);
1402 return err;
1403 }
1404 }
1405 up_read(&snd_ioctl_rwsem);
Takashi Iwai6d85be62005-05-15 14:32:50 +02001406 snd_printdd("unknown ioctl = 0x%x\n", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 return -ENOTTY;
1408}
1409
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001410static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
1411 size_t count, loff_t * offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001413 struct snd_ctl_file *ctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 int err = 0;
1415 ssize_t result = 0;
1416
1417 ctl = file->private_data;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001418 if (snd_BUG_ON(!ctl || !ctl->card))
1419 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 if (!ctl->subscribed)
1421 return -EBADFD;
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001422 if (count < sizeof(struct snd_ctl_event))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 return -EINVAL;
1424 spin_lock_irq(&ctl->read_lock);
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001425 while (count >= sizeof(struct snd_ctl_event)) {
1426 struct snd_ctl_event ev;
1427 struct snd_kctl_event *kev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 while (list_empty(&ctl->events)) {
1429 wait_queue_t wait;
1430 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1431 err = -EAGAIN;
1432 goto __end_lock;
1433 }
1434 init_waitqueue_entry(&wait, current);
1435 add_wait_queue(&ctl->change_sleep, &wait);
1436 set_current_state(TASK_INTERRUPTIBLE);
1437 spin_unlock_irq(&ctl->read_lock);
1438 schedule();
1439 remove_wait_queue(&ctl->change_sleep, &wait);
1440 if (signal_pending(current))
Adrian Bunk0e5d7202006-11-07 13:42:54 +01001441 return -ERESTARTSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 spin_lock_irq(&ctl->read_lock);
1443 }
1444 kev = snd_kctl_event(ctl->events.next);
1445 ev.type = SNDRV_CTL_EVENT_ELEM;
1446 ev.data.elem.mask = kev->mask;
1447 ev.data.elem.id = kev->id;
1448 list_del(&kev->list);
1449 spin_unlock_irq(&ctl->read_lock);
1450 kfree(kev);
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001451 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 err = -EFAULT;
1453 goto __end;
1454 }
1455 spin_lock_irq(&ctl->read_lock);
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001456 buffer += sizeof(struct snd_ctl_event);
1457 count -= sizeof(struct snd_ctl_event);
1458 result += sizeof(struct snd_ctl_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 }
1460 __end_lock:
1461 spin_unlock_irq(&ctl->read_lock);
1462 __end:
1463 return result > 0 ? result : err;
1464}
1465
1466static unsigned int snd_ctl_poll(struct file *file, poll_table * wait)
1467{
1468 unsigned int mask;
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001469 struct snd_ctl_file *ctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
1471 ctl = file->private_data;
1472 if (!ctl->subscribed)
1473 return 0;
1474 poll_wait(file, &ctl->change_sleep, wait);
1475
1476 mask = 0;
1477 if (!list_empty(&ctl->events))
1478 mask |= POLLIN | POLLRDNORM;
1479
1480 return mask;
1481}
1482
1483/*
1484 * register the device-specific control-ioctls.
1485 * called from each device manager like pcm.c, hwdep.c, etc.
1486 */
1487static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
1488{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001489 struct snd_kctl_ioctl *pn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001491 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 if (pn == NULL)
1493 return -ENOMEM;
1494 pn->fioctl = fcn;
1495 down_write(&snd_ioctl_rwsem);
1496 list_add_tail(&pn->list, lists);
1497 up_write(&snd_ioctl_rwsem);
1498 return 0;
1499}
1500
1501int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
1502{
1503 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
1504}
1505
Takashi Iwaic0d3fb32006-04-28 15:13:39 +02001506EXPORT_SYMBOL(snd_ctl_register_ioctl);
1507
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508#ifdef CONFIG_COMPAT
1509int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1510{
1511 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
1512}
Takashi Iwaic0d3fb32006-04-28 15:13:39 +02001513
1514EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515#endif
1516
1517/*
1518 * de-register the device-specific control-ioctls.
1519 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001520static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
1521 struct list_head *lists)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001523 struct snd_kctl_ioctl *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001525 if (snd_BUG_ON(!fcn))
1526 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 down_write(&snd_ioctl_rwsem);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001528 list_for_each_entry(p, lists, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 if (p->fioctl == fcn) {
1530 list_del(&p->list);
1531 up_write(&snd_ioctl_rwsem);
1532 kfree(p);
1533 return 0;
1534 }
1535 }
1536 up_write(&snd_ioctl_rwsem);
1537 snd_BUG();
1538 return -EINVAL;
1539}
1540
1541int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
1542{
1543 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
1544}
1545
Takashi Iwaic0d3fb32006-04-28 15:13:39 +02001546EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
1547
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548#ifdef CONFIG_COMPAT
1549int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
1550{
1551 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
1552}
1553
Takashi Iwaic0d3fb32006-04-28 15:13:39 +02001554EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555#endif
1556
1557static int snd_ctl_fasync(int fd, struct file * file, int on)
1558{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001559 struct snd_ctl_file *ctl;
Jonathan Corbet60aa4922009-02-01 14:52:56 -07001560
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 ctl = file->private_data;
Jonathan Corbet60aa4922009-02-01 14:52:56 -07001562 return fasync_helper(fd, file, on, &ctl->fasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563}
1564
1565/*
1566 * ioctl32 compat
1567 */
1568#ifdef CONFIG_COMPAT
1569#include "control_compat.c"
1570#else
1571#define snd_ctl_ioctl_compat NULL
1572#endif
1573
1574/*
1575 * INIT PART
1576 */
1577
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001578static const struct file_operations snd_ctl_f_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579{
1580 .owner = THIS_MODULE,
1581 .read = snd_ctl_read,
1582 .open = snd_ctl_open,
1583 .release = snd_ctl_release,
Takashi Iwai02f48652010-04-13 11:49:04 +02001584 .llseek = no_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 .poll = snd_ctl_poll,
1586 .unlocked_ioctl = snd_ctl_ioctl,
1587 .compat_ioctl = snd_ctl_ioctl_compat,
1588 .fasync = snd_ctl_fasync,
1589};
1590
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591/*
1592 * registration of the control device
1593 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001594static int snd_ctl_dev_register(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001596 struct snd_card *card = device->device_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 int err, cardnum;
1598 char name[16];
1599
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001600 if (snd_BUG_ON(!card))
1601 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 cardnum = card->number;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001603 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1604 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 sprintf(name, "controlC%i", cardnum);
Clemens Ladischf87135f2005-11-20 14:06:59 +01001606 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
1607 &snd_ctl_f_ops, card, name)) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 return err;
1609 return 0;
1610}
1611
1612/*
1613 * disconnection of the control device
1614 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001615static int snd_ctl_dev_disconnect(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001617 struct snd_card *card = device->device_data;
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001618 struct snd_ctl_file *ctl;
Takashi Iwaic4614822006-06-23 14:38:23 +02001619 int err, cardnum;
1620
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001621 if (snd_BUG_ON(!card))
1622 return -ENXIO;
Takashi Iwaic4614822006-06-23 14:38:23 +02001623 cardnum = card->number;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001624 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
1625 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626
Takashi Iwaid8009882008-09-07 12:51:13 +02001627 read_lock(&card->ctl_files_rwlock);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001628 list_for_each_entry(ctl, &card->ctl_files, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 wake_up(&ctl->change_sleep);
1630 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
1631 }
Takashi Iwaid8009882008-09-07 12:51:13 +02001632 read_unlock(&card->ctl_files_rwlock);
Takashi Iwaic4614822006-06-23 14:38:23 +02001633
1634 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
1635 card, -1)) < 0)
1636 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 return 0;
1638}
1639
1640/*
1641 * free all controls
1642 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001643static int snd_ctl_dev_free(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001645 struct snd_card *card = device->device_data;
1646 struct snd_kcontrol *control;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647
1648 down_write(&card->controls_rwsem);
1649 while (!list_empty(&card->controls)) {
1650 control = snd_kcontrol(card->controls.next);
1651 snd_ctl_remove(card, control);
1652 }
1653 up_write(&card->controls_rwsem);
1654 return 0;
1655}
1656
1657/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 * create control core:
1659 * called from init.c
1660 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001661int snd_ctl_create(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662{
Takashi Iwai82e9bae2005-11-17 13:53:23 +01001663 static struct snd_device_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 .dev_free = snd_ctl_dev_free,
1665 .dev_register = snd_ctl_dev_register,
1666 .dev_disconnect = snd_ctl_dev_disconnect,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 };
1668
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001669 if (snd_BUG_ON(!card))
1670 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
1672}
Takashi Iwaib9ed4f22007-07-23 15:41:34 +02001673
1674/*
Clemens Ladisch96007322011-01-10 16:25:44 +01001675 * Frequently used control callbacks/helpers
Takashi Iwaib9ed4f22007-07-23 15:41:34 +02001676 */
1677int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
1678 struct snd_ctl_elem_info *uinfo)
1679{
1680 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1681 uinfo->count = 1;
1682 uinfo->value.integer.min = 0;
1683 uinfo->value.integer.max = 1;
1684 return 0;
1685}
1686
1687EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
1688
1689int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
1690 struct snd_ctl_elem_info *uinfo)
1691{
1692 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1693 uinfo->count = 2;
1694 uinfo->value.integer.min = 0;
1695 uinfo->value.integer.max = 1;
1696 return 0;
1697}
1698
1699EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);
Clemens Ladisch96007322011-01-10 16:25:44 +01001700
1701/**
1702 * snd_ctl_enum_info - fills the info structure for an enumerated control
1703 * @info: the structure to be filled
1704 * @channels: the number of the control's channels; often one
1705 * @items: the number of control values; also the size of @names
1706 * @names: an array containing the names of all control values
1707 *
1708 * Sets all required fields in @info to their appropriate values.
1709 * If the control's accessibility is not the default (readable and writable),
1710 * the caller has to fill @info->access.
1711 */
1712int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
1713 unsigned int items, const char *const names[])
1714{
1715 info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1716 info->count = channels;
1717 info->value.enumerated.items = items;
1718 if (info->value.enumerated.item >= items)
1719 info->value.enumerated.item = items - 1;
1720 strlcpy(info->value.enumerated.name,
1721 names[info->value.enumerated.item],
1722 sizeof(info->value.enumerated.name));
1723 return 0;
1724}
1725EXPORT_SYMBOL(snd_ctl_enum_info);