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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 | const 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 | unsigned int access; /* access rights */ |
60 | }; |
61 | |
62 | struct snd_kcontrol { |
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; |
69 | union { |
70 | snd_kcontrol_tlv_rw_t *c; |
71 | const unsigned int *p; |
72 | } tlv; |
73 | unsigned long private_value; |
74 | void *private_data; |
75 | void (*private_free)(struct snd_kcontrol *kcontrol); |
76 | struct snd_kcontrol_volatile vd[0]; /* volatile data */ |
77 | }; |
78 | |
79 | #define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list) |
80 | |
81 | struct snd_kctl_event { |
82 | struct list_head list; /* list of events */ |
83 | struct snd_ctl_elem_id id; |
84 | unsigned int mask; |
85 | }; |
86 | |
87 | #define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list) |
88 | |
89 | struct pid; |
90 | |
91 | struct snd_ctl_file { |
92 | struct list_head list; /* list of all control files */ |
93 | struct snd_card *card; |
94 | struct pid *pid; |
95 | int prefer_pcm_subdevice; |
96 | int prefer_rawmidi_subdevice; |
97 | wait_queue_head_t change_sleep; |
98 | spinlock_t read_lock; |
99 | struct fasync_struct *fasync; |
100 | int subscribed; /* read interface is activated */ |
101 | struct list_head events; /* waiting events for read */ |
102 | }; |
103 | |
104 | #define snd_ctl_file(n) list_entry(n, struct snd_ctl_file, list) |
105 | |
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); |
109 | |
110 | void snd_ctl_notify(struct snd_card * card, unsigned int mask, struct snd_ctl_elem_id * id); |
111 | |
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, |
120 | int active); |
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); |
123 | |
124 | int snd_ctl_create(struct snd_card *card); |
125 | |
126 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn); |
127 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn); |
128 | #ifdef CONFIG_COMPAT |
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); |
131 | #else |
132 | #define snd_ctl_register_ioctl_compat(fcn) |
133 | #define snd_ctl_unregister_ioctl_compat(fcn) |
134 | #endif |
135 | |
136 | static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
137 | { |
138 | return id->numid - kctl->id.numid; |
139 | } |
140 | |
141 | static inline unsigned int snd_ctl_get_ioffidx(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
142 | { |
143 | return id->index - kctl->id.index; |
144 | } |
145 | |
146 | static inline unsigned int snd_ctl_get_ioff(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id) |
147 | { |
148 | if (id->numid) { |
149 | return snd_ctl_get_ioffnum(kctl, id); |
150 | } else { |
151 | return snd_ctl_get_ioffidx(kctl, id); |
152 | } |
153 | } |
154 | |
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, |
157 | unsigned int offset) |
158 | { |
159 | *dst_id = src_kctl->id; |
160 | dst_id->index += offset; |
161 | dst_id->numid += offset; |
162 | return dst_id; |
163 | } |
164 | |
165 | /* |
166 | * Frequently used control callbacks/helpers |
167 | */ |
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[]); |
174 | |
175 | /* |
176 | * virtual master control |
177 | */ |
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, |
181 | unsigned int flags); |
182 | /* optional flags for slave */ |
183 | #define SND_CTL_SLAVE_NEED_UPDATE (1 << 0) |
184 | |
185 | /** |
186 | * snd_ctl_add_slave - Add a virtual slave control |
187 | * @master: vmaster element |
188 | * @slave: slave element to add |
189 | * |
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. |
193 | * |
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 |
196 | * responsibility. |
197 | * |
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 |
202 | */ |
203 | static inline int |
204 | snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave) |
205 | { |
206 | return _snd_ctl_add_slave(master, slave, 0); |
207 | } |
208 | |
209 | /** |
210 | * snd_ctl_add_slave_uncached - Add a virtual slave control |
211 | * @master: vmaster element |
212 | * @slave: slave element to add |
213 | * |
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. |
218 | * |
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. |
222 | */ |
223 | static inline int |
224 | snd_ctl_add_slave_uncached(struct snd_kcontrol *master, |
225 | struct snd_kcontrol *slave) |
226 | { |
227 | return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE); |
228 | } |
229 | |
230 | int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kctl, |
231 | void (*hook)(void *private_data, int), |
232 | void *private_data); |
233 | void snd_ctl_sync_vmaster_hook(struct snd_kcontrol *kctl); |
234 | |
235 | /* |
236 | * Helper functions for jack-detection controls |
237 | */ |
238 | struct snd_kcontrol * |
239 | snd_kctl_jack_new(const char *name, int idx, void *private_data); |
240 | void snd_kctl_jack_report(struct snd_card *card, |
241 | struct snd_kcontrol *kctl, bool status); |
242 | |
243 | #endif /* __SOUND_CONTROL_H */ |
244 |
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