5 * Advanced Linux Sound Architecture - ALSA - Driver
6 * Copyright (c) 2006 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
26 * TLV structure is right behind the struct snd_ctl_tlv:
27 * unsigned int type - see SNDRV_CTL_TLVT_*
29 * .... data aligned to sizeof(unsigned int), use
30 * block_length = (length + (sizeof(unsigned int) - 1)) &
31 * ~(sizeof(unsigned int) - 1)) ....
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 #define SNDRV_CTL_TLVT_DB_MINMAX 4 /* dB scale with min/max */
39 #define SNDRV_CTL_TLVT_DB_MINMAX_MUTE 5 /* dB scale with min/max with mute */
41 #define TLV_ITEM(type, ...) \
42 (type), TLV_LENGTH(__VA_ARGS__), __VA_ARGS__
43 #define TLV_LENGTH(...) \
44 ((unsigned int)sizeof((const unsigned int[]) { __VA_ARGS__ }))
46 #define TLV_DB_SCALE_MASK 0xffff
47 #define TLV_DB_SCALE_MUTE 0x10000
48 #define TLV_DB_SCALE_ITEM(min, step, mute) \
49 TLV_ITEM(SNDRV_CTL_TLVT_DB_SCALE, \
51 ((step) & TLV_DB_SCALE_MASK) | \
52 ((mute) ? TLV_DB_SCALE_MUTE : 0))
53 #define DECLARE_TLV_DB_SCALE(name, min, step, mute) \
54 unsigned int name[] = { TLV_DB_SCALE_ITEM(min, step, mute) }
56 /* dB scale specified with min/max values instead of step */
57 #define TLV_DB_MINMAX_ITEM(min_dB, max_dB) \
58 TLV_ITEM(SNDRV_CTL_TLVT_DB_MINMAX, (min_dB), (max_dB))
59 #define TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) \
60 TLV_ITEM(SNDRV_CTL_TLVT_DB_MINMAX_MUTE, (min_dB), (max_dB))
61 #define DECLARE_TLV_DB_MINMAX(name, min_dB, max_dB) \
62 unsigned int name[] = { TLV_DB_MINMAX_ITEM(min_dB, max_dB) }
63 #define DECLARE_TLV_DB_MINMAX_MUTE(name, min_dB, max_dB) \
64 unsigned int name[] = { TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) }
66 /* linear volume between min_dB and max_dB (.01dB unit) */
67 #define TLV_DB_LINEAR_ITEM(min_dB, max_dB) \
68 TLV_ITEM(SNDRV_CTL_TLVT_DB_LINEAR, (min_dB), (max_dB))
69 #define DECLARE_TLV_DB_LINEAR(name, min_dB, max_dB) \
70 unsigned int name[] = { TLV_DB_LINEAR_ITEM(min_dB, max_dB) }
72 /* dB range container */
73 /* Each item is: <min> <max> <TLV> */
74 #define TLV_DB_RANGE_ITEM(...) \
75 TLV_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__)
76 #define DECLARE_TLV_DB_RANGE(name, ...) \
77 unsigned int name[] = { TLV_DB_RANGE_ITEM(__VA_ARGS__) }
78 /* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */
79 #define TLV_DB_RANGE_HEAD(num) \
80 SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int)
82 #define TLV_DB_GAIN_MUTE -9999999
84 #endif /* __SOUND_TLV_H */