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1 | #ifndef __SOUND_CONTROL_H |
2 | #define __SOUND_CONTROL_H |
3 | |
4 | /* |
5 | * Header file for control interface |
6 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
7 | * |
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 | |
27 | #define snd_kcontrol_chip(kcontrol) ((kcontrol)->private_data) |
28 | |
29 | struct snd_kcontrol; |
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 */ |
35 | unsigned int size, |
36 | unsigned int __user *tlv); |
37 | |
38 | |
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; |
50 | union { |
51 | snd_kcontrol_tlv_rw_t *c; |
52 | const unsigned int *p; |
53 | } tlv; |
54 | unsigned long private_value; |
55 | }; |
56 | |
57 | struct snd_kcontrol_volatile { |
58 | struct snd_ctl_file *owner; /* locked */ |
59 | pid_t owner_pid; |
60 | unsigned int access; /* access rights */ |
61 | }; |
62 | |
63 | struct snd_kcontrol { |
64 | struct list_head list; /* list of controls */ |
65 | struct snd_ctl_elem_id id; |
66 | 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; |
70 | union { |
71 | snd_kcontrol_tlv_rw_t *c; |
72 | const unsigned int *p; |
73 | } tlv; |
74 | unsigned long private_value; |
75 | void *private_data; |
76 | void (*private_free)(struct snd_kcontrol *kcontrol); |
77 | struct snd_kcontrol_volatile vd[0]; /* volatile data */ |
78 | }; |
79 | |
80 | #define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list) |
81 | |
82 | struct snd_kctl_event { |
83 | struct list_head list; /* list of events */ |
84 | struct snd_ctl_elem_id id; |
85 | unsigned int mask; |
86 | }; |
87 | |
88 | #define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list) |
89 | |
90 | struct snd_ctl_file { |
91 | struct list_head list; /* list of all control files */ |
92 | struct snd_card *card; |
93 | 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 | |
103 | #define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list) |
104 | |
105 | typedef int (*snd_kctl_ioctl_func_t) (struct snd_card * card, |
106 | struct snd_ctl_file * control, |
107 | unsigned int cmd, unsigned long arg); |
108 | |
109 | void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id); |
110 | |
111 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new * kcontrolnew, void * private_data); |
112 | void snd_ctl_free_one(struct snd_kcontrol * kcontrol); |
113 | int snd_ctl_add(struct snd_card * card, struct snd_kcontrol * kcontrol); |
114 | int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol); |
115 | int snd_ctl_remove_id(struct snd_card * card, struct snd_ctl_elem_id *id); |
116 | int snd_ctl_rename_id(struct snd_card * card, struct snd_ctl_elem_id *src_id, struct snd_ctl_elem_id *dst_id); |
117 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card * card, unsigned int numid); |
118 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id *id); |
119 | |
120 | int snd_ctl_create(struct snd_card *card); |
121 | |
122 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn); |
123 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn); |
124 | #ifdef CONFIG_COMPAT |
125 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn); |
126 | int 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 | |
132 | static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
133 | { |
134 | return id->numid - kctl->id.numid; |
135 | } |
136 | |
137 | static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
138 | { |
139 | return id->index - kctl->id.index; |
140 | } |
141 | |
142 | static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
143 | { |
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 | |
151 | static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id *dst_id, |
152 | struct snd_kcontrol *src_kctl, |
153 | 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 | |
161 | /* |
162 | * Frequently used control callbacks |
163 | */ |
164 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, |
165 | struct snd_ctl_elem_info *uinfo); |
166 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, |
167 | struct snd_ctl_elem_info *uinfo); |
168 | |
169 | /* |
170 | * virtual master control |
171 | */ |
172 | struct snd_kcontrol *snd_ctl_make_virtual_master(char *name, |
173 | const unsigned int *tlv); |
174 | int _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 | |
179 | /** |
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 | */ |
197 | static inline int |
198 | snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave) |
199 | { |
200 | return _snd_ctl_add_slave(master, slave, 0); |
201 | } |
202 | |
203 | /** |
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 | */ |
217 | static inline int |
218 | snd_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 | |
224 | #endif /* __SOUND_CONTROL_H */ |
225 |
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