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 #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 */ 40 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__ })) 45 46 #define TLV_CONTAINER_ITEM(...) \ 47 TLV_ITEM(SNDRV_CTL_TLVT_CONTAINER, __VA_ARGS__) 48 #define DECLARE_TLV_CONTAINER(name, ...) \ 49 unsigned int name[] = { TLV_CONTAINER_ITEM(__VA_ARGS__) } 50 51 #define TLV_DB_SCALE_MASK 0xffff 52 #define TLV_DB_SCALE_MUTE 0x10000 53 #define TLV_DB_SCALE_ITEM(min, step, mute) \ 54 TLV_ITEM(SNDRV_CTL_TLVT_DB_SCALE, \ 55 (min), \ 56 ((step) & TLV_DB_SCALE_MASK) | \ 57 ((mute) ? TLV_DB_SCALE_MUTE : 0)) 58 #define DECLARE_TLV_DB_SCALE(name, min, step, mute) \ 59 unsigned int name[] = { TLV_DB_SCALE_ITEM(min, step, mute) } 60 61 /* dB scale specified with min/max values instead of step */ 62 #define TLV_DB_MINMAX_ITEM(min_dB, max_dB) \ 63 TLV_ITEM(SNDRV_CTL_TLVT_DB_MINMAX, (min_dB), (max_dB)) 64 #define TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) \ 65 TLV_ITEM(SNDRV_CTL_TLVT_DB_MINMAX_MUTE, (min_dB), (max_dB)) 66 #define DECLARE_TLV_DB_MINMAX(name, min_dB, max_dB) \ 67 unsigned int name[] = { TLV_DB_MINMAX_ITEM(min_dB, max_dB) } 68 #define DECLARE_TLV_DB_MINMAX_MUTE(name, min_dB, max_dB) \ 69 unsigned int name[] = { TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) } 70 71 /* linear volume between min_dB and max_dB (.01dB unit) */ 72 #define TLV_DB_LINEAR_ITEM(min_dB, max_dB) \ 73 TLV_ITEM(SNDRV_CTL_TLVT_DB_LINEAR, (min_dB), (max_dB)) 74 #define DECLARE_TLV_DB_LINEAR(name, min_dB, max_dB) \ 75 unsigned int name[] = { TLV_DB_LINEAR_ITEM(min_dB, max_dB) } 76 77 /* dB range container: 78 * Items in dB range container must be ordered by their values and by their 79 * dB values. This implies that larger values must correspond with larger 80 * dB values (which is also required for all other mixer controls). 81 */ 82 /* Each item is: <min> <max> <TLV> */ 83 #define TLV_DB_RANGE_ITEM(...) \ 84 TLV_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__) 85 #define DECLARE_TLV_DB_RANGE(name, ...) \ 86 unsigned int name[] = { TLV_DB_RANGE_ITEM(__VA_ARGS__) } 87 /* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */ 88 #define TLV_DB_RANGE_HEAD(num) \ 89 SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int) 90 91 #define TLV_DB_GAIN_MUTE -9999999 92 93 /* 94 * channel-mapping TLV items 95 * TLV length must match with num_channels 96 */ 97 #define SNDRV_CTL_TLVT_CHMAP_FIXED 0x101 /* fixed channel position */ 98 #define SNDRV_CTL_TLVT_CHMAP_VAR 0x102 /* channels freely swappable */ 99 #define SNDRV_CTL_TLVT_CHMAP_PAIRED 0x103 /* pair-wise swappable */ 100 101 #endif /* __SOUND_TLV_H */ 102