1 #ifndef __SOUND_CONTROL_H
2 #define __SOUND_CONTROL_H
5 * Header file for control interface
6 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
25 #include <sound/asound.h>
27 #define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data)
30 typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo);
31 typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
32 typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
33 typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol,
34 int op_flag, /* 0=read,1=write,-1=command */
36 unsigned int __user *tlv);
39 struct snd_kcontrol_new {
40 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;
51 snd_kcontrol_tlv_rw_t *c;
52 const unsigned int *p;
54 unsigned long private_value;
57 struct snd_kcontrol_volatile {
58 struct snd_ctl_file *owner; /* locked */
59 unsigned int access; /* access rights */
63 struct list_head list; /* list of controls */
64 struct snd_ctl_elem_id id;
65 unsigned int count; /* count of same elements */
66 snd_kcontrol_info_t *info;
67 snd_kcontrol_get_t *get;
68 snd_kcontrol_put_t *put;
70 snd_kcontrol_tlv_rw_t *c;
71 const unsigned int *p;
73 unsigned long private_value;
75 void (*private_free)(struct snd_kcontrol *kcontrol);
76 struct snd_kcontrol_volatile vd[0]; /* volatile data */
79 #define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list)
81 struct snd_kctl_event {
82 struct list_head list; /* list of events */
83 struct snd_ctl_elem_id id;
87 #define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list)
92 struct list_head list; /* list of all control files */
93 struct snd_card *card;
95 int prefer_pcm_subdevice;
96 int prefer_rawmidi_subdevice;
97 wait_queue_head_t change_sleep;
99 struct fasync_struct *fasync;
100 int subscribed; /* read interface is activated */
101 struct list_head events; /* waiting events for read */
104 #define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list)
106 typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card,
107 struct snd_ctl_file * control,
108 unsigned int cmd, unsigned long arg);
110 void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id);
112 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data);
113 void snd_ctl_free_one(struct snd_kcontrol * kcontrol);
114 int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol);
115 int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol);
116 int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, bool add_on_replace);
117 int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id);
118 int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id);
119 int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id,
121 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid);
122 struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id);
124 int snd_ctl_create(struct snd_card *card);
126 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);
127 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);
129 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);
130 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
132 #define snd_ctl_register_ioctl_compat(fcn)
133 #define snd_ctl_unregister_ioctl_compat(fcn)
136 static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
138 return id->numid - kctl->id.numid;
141 static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
143 return id->index - kctl->id.index;
146 static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
149 return snd_ctl_get_ioffnum(kctl, id);
151 return snd_ctl_get_ioffidx(kctl, id);
155 static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id,
156 struct snd_kcontrol *src_kctl,
159 *dst_id = src_kctl->id;
160 dst_id->index += offset;
161 dst_id->numid += offset;
166 * Frequently used control callbacks/helpers
168 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
169 struct snd_ctl_elem_info *uinfo);
170 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
171 struct snd_ctl_elem_info *uinfo);
172 int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
173 unsigned int items, const char *const names[]);
176 * virtual master control
178 struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
179 const unsigned int *tlv);
180 int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
182 /* optional flags for slave */
183 #define SND_CTL_SLAVE_NEED_UPDATE (1 << 0)
186 * snd_ctl_add_slave - Add a virtual slave control
187 * @master: vmaster element
188 * @slave: slave element to add
190 * Add a virtual slave control to the given master element created via
191 * snd_ctl_create_virtual_master() beforehand.
192 * Returns zero if successful or a negative error code.
194 * All slaves must be the same type (returning the same information
195 * via info callback). The function doesn't check it, so it's your
198 * Also, some additional limitations:
199 * at most two channels,
200 * logarithmic volume control (dB level) thus no linear volume,
201 * master can only attenuate the volume without gain
204 snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
206 return _snd_ctl_add_slave(master, slave, 0);
210 * snd_ctl_add_slave_uncached - Add a virtual slave control
211 * @master: vmaster element
212 * @slave: slave element to add
214 * Add a virtual slave control to the given master.
215 * Unlike snd_ctl_add_slave(), the element added via this function
216 * is supposed to have volatile values, and get callback is called
217 * at each time quried from the master.
219 * When the control peeks the hardware values directly and the value
220 * can be changed by other means than the put callback of the element,
221 * this function should be used to keep the value always up-to-date.
224 snd_ctl_add_slave_uncached(struct snd_kcontrol *master,
225 struct snd_kcontrol *slave)
227 return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE);
230 #endif /* __SOUND_CONTROL_H */