1 #ifndef __SOUND_TLV_H
2 #define __SOUND_TLV_H
3
4 /*
5 * Advanced Linux Sound Architecture - ALSA - Driver
6 * Copyright (c) 2006 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 /*
26 * TLV structure is right behind the struct snd_ctl_tlv:
27 * unsigned int type - see SNDRV_CTL_TLVT_*
28 * unsigned int length
29 * .... data aligned to sizeof(unsigned int), use
30 * block_length = (length + (sizeof(unsigned int) - 1)) &
31 * ~(sizeof(unsigned int) - 1)) ....
32 */
33
34 #define SNDRV_CTL_TLVT_CONTAINER 0 /* one level down - group of TLVs */
35 #define SNDRV_CTL_TLVT_DB_SCALE 1 /* dB scale */
36 #define SNDRV_CTL_TLVT_DB_LINEAR 2 /* linear volume */
37 #define SNDRV_CTL_TLVT_DB_RANGE 3 /* dB range container */
38
39 #define TLV_DB_SCALE_ITEM(min, step, mute) \
40 SNDRV_CTL_TLVT_DB_SCALE, 2 * sizeof(unsigned int), \
41 (min), ((step) & 0xffff) | ((mute) ? 0x10000 : 0)
42 #define DECLARE_TLV_DB_SCALE(name, min, step, mute) \
43 unsigned int name[] = { TLV_DB_SCALE_ITEM(min, step, mute) }
44
45 /* linear volume between min_dB and max_dB (.01dB unit) */
46 #define TLV_DB_LINEAR_ITEM(min_dB, max_dB) \
47 SNDRV_CTL_TLVT_DB_LINEAR, 2 * sizeof(unsigned int), \
48 (min_dB), (max_dB)
49 #define DECLARE_TLV_DB_LINEAR(name, min_dB, max_dB) \
50 unsigned int name[] = { TLV_DB_LINEAR_ITEM(min_dB, max_dB) }
51
52 /* dB range container */
53 /* Each item is: <min> <max> <TLV> */
54 /* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */
55 #define TLV_DB_RANGE_HEAD(num) \
56 SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int)
57
58 #define TLV_DB_GAIN_MUTE -9999999
59
60 #endif /* __SOUND_TLV_H */
61
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