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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __SOUND_CONTROL_H
2#define __SOUND_CONTROL_H
3
4/*
5 * Header file for control interface
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02006 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 */
24
25#include <sound/asound.h>
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data)
28
Takashi Iwai82e9bae2005-11-17 13:53:23 +010029struct snd_kcontrol;
30typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo);
31typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
32typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +020033typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol,
34 int op_flag, /* 0=read,1=write,-1=command */
35 unsigned int size,
36 unsigned int __user *tlv);
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Takashi Iwai82e9bae2005-11-17 13:53:23 +010039struct snd_kcontrol_new {
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 snd_ctl_elem_iface_t iface; /* interface identifier */
41 unsigned int device; /* device/client number */
42 unsigned int subdevice; /* subdevice (substream) number */
43 unsigned char *name; /* ASCII name of item */
44 unsigned int index; /* index of item */
45 unsigned int access; /* access rights */
46 unsigned int count; /* count of same elements */
47 snd_kcontrol_info_t *info;
48 snd_kcontrol_get_t *get;
49 snd_kcontrol_put_t *put;
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +020050 union {
51 snd_kcontrol_tlv_rw_t *c;
Takashi Iwai0cb29ea2007-01-29 15:33:49 +010052 const unsigned int *p;
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +020053 } tlv;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 unsigned long private_value;
Takashi Iwai82e9bae2005-11-17 13:53:23 +010055};
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Takashi Iwai82e9bae2005-11-17 13:53:23 +010057struct snd_kcontrol_volatile {
58 struct snd_ctl_file *owner; /* locked */
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 pid_t owner_pid;
60 unsigned int access; /* access rights */
Takashi Iwai82e9bae2005-11-17 13:53:23 +010061};
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Takashi Iwai82e9bae2005-11-17 13:53:23 +010063struct snd_kcontrol {
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 struct list_head list; /* list of controls */
Takashi Iwai82e9bae2005-11-17 13:53:23 +010065 struct snd_ctl_elem_id id;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 unsigned int count; /* count of same elements */
67 snd_kcontrol_info_t *info;
68 snd_kcontrol_get_t *get;
69 snd_kcontrol_put_t *put;
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +020070 union {
71 snd_kcontrol_tlv_rw_t *c;
Takashi Iwai0cb29ea2007-01-29 15:33:49 +010072 const unsigned int *p;
Jaroslav Kysela8aa9b582006-07-05 17:34:51 +020073 } tlv;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 unsigned long private_value;
75 void *private_data;
Takashi Iwai82e9bae2005-11-17 13:53:23 +010076 void (*private_free)(struct snd_kcontrol *kcontrol);
77 struct snd_kcontrol_volatile vd[0]; /* volatile data */
Linus Torvalds1da177e2005-04-16 15:20:36 -070078};
79
Takashi Iwai82e9bae2005-11-17 13:53:23 +010080#define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Takashi Iwai82e9bae2005-11-17 13:53:23 +010082struct snd_kctl_event {
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 struct list_head list; /* list of events */
Takashi Iwai82e9bae2005-11-17 13:53:23 +010084 struct snd_ctl_elem_id id;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 unsigned int mask;
Takashi Iwai82e9bae2005-11-17 13:53:23 +010086};
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Takashi Iwai82e9bae2005-11-17 13:53:23 +010088#define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Takashi Iwai82e9bae2005-11-17 13:53:23 +010090struct snd_ctl_file {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 struct list_head list; /* list of all control files */
Takashi Iwai82e9bae2005-11-17 13:53:23 +010092 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 pid_t pid;
94 int prefer_pcm_subdevice;
95 int prefer_rawmidi_subdevice;
96 wait_queue_head_t change_sleep;
97 spinlock_t read_lock;
98 struct fasync_struct *fasync;
99 int subscribed; /* read interface is activated */
100 struct list_head events; /* waiting events for read */
101};
102
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100103#define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100105typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card,
106 struct snd_ctl_file * control,
107 unsigned int cmd, unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100109void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100111struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data);
112void snd_ctl_free_one(struct snd_kcontrol * kcontrol);
113int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol);
114int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol);
115int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id);
116int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id);
117struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid);
118struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100120int snd_ctl_create(struct snd_card *card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);
123int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);
124#ifdef CONFIG_COMPAT
125int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);
126int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
127#else
128#define snd_ctl_register_ioctl_compat(fcn)
129#define snd_ctl_unregister_ioctl_compat(fcn)
130#endif
131
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100132static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
134 return id->numid - kctl->id.numid;
135}
136
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100137static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
139 return id->index - kctl->id.index;
140}
141
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100142static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
144 if (id->numid) {
145 return snd_ctl_get_ioffnum(kctl, id);
146 } else {
147 return snd_ctl_get_ioffidx(kctl, id);
148 }
149}
150
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100151static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id,
152 struct snd_kcontrol *src_kctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 unsigned int offset)
154{
155 *dst_id = src_kctl->id;
156 dst_id->index += offset;
157 dst_id->numid += offset;
158 return dst_id;
159}
160
Takashi Iwaib9ed4f22007-07-23 15:41:34 +0200161/*
162 * Frequently used control callbacks
163 */
164int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
165 struct snd_ctl_elem_info *uinfo);
166int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
167 struct snd_ctl_elem_info *uinfo);
168
Takashi Iwaie922b002008-02-18 13:03:13 +0100169/*
170 * virtual master control
171 */
172struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
173 const unsigned int *tlv);
Takashi Iwaif5b1db62009-01-16 18:15:22 +0100174int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
175 unsigned int flags);
176/* optional flags for slave */
177#define SND_CTL_SLAVE_NEED_UPDATE (1 << 0)
178
Takashi Iwai79c7cdd2009-02-09 14:47:19 +0100179/**
180 * snd_ctl_add_slave - Add a virtual slave control
181 * @master: vmaster element
182 * @slave: slave element to add
183 *
184 * Add a virtual slave control to the given master element created via
185 * snd_ctl_create_virtual_master() beforehand.
186 * Returns zero if successful or a negative error code.
187 *
188 * All slaves must be the same type (returning the same information
189 * via info callback). The fucntion doesn't check it, so it's your
190 * responsibility.
191 *
192 * Also, some additional limitations:
193 * at most two channels,
194 * logarithmic volume control (dB level) thus no linear volume,
195 * master can only attenuate the volume without gain
196 */
Takashi Iwaif5b1db62009-01-16 18:15:22 +0100197static inline int
198snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
199{
200 return _snd_ctl_add_slave(master, slave, 0);
201}
202
Takashi Iwai79c7cdd2009-02-09 14:47:19 +0100203/**
204 * snd_ctl_add_slave_uncached - Add a virtual slave control
205 * @master: vmaster element
206 * @slave: slave element to add
207 *
208 * Add a virtual slave control to the given master.
209 * Unlike snd_ctl_add_slave(), the element added via this function
210 * is supposed to have volatile values, and get callback is called
211 * at each time quried from the master.
212 *
213 * When the control peeks the hardware values directly and the value
214 * can be changed by other means than the put callback of the element,
215 * this function should be used to keep the value always up-to-date.
216 */
Takashi Iwaif5b1db62009-01-16 18:15:22 +0100217static inline int
218snd_ctl_add_slave_uncached(struct snd_kcontrol *master,
219 struct snd_kcontrol *slave)
220{
221 return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE);
222}
223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224#endif /* __SOUND_CONTROL_H */