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 #include <uapi/sound/tlv.h> 35 36 #define TLV_ITEM(type, ...) \ 37 (type), TLV_LENGTH(__VA_ARGS__), __VA_ARGS__ 38 #define TLV_LENGTH(...) \ 39 ((unsigned int)sizeof((const unsigned int[]) { __VA_ARGS__ })) 40 41 #define TLV_CONTAINER_ITEM(...) \ 42 TLV_ITEM(SNDRV_CTL_TLVT_CONTAINER, __VA_ARGS__) 43 #define DECLARE_TLV_CONTAINER(name, ...) \ 44 unsigned int name[] = { TLV_CONTAINER_ITEM(__VA_ARGS__) } 45 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, \ 50 (min), \ 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) } 55 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) } 65 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) } 71 72 /* dB range container: 73 * Items in dB range container must be ordered by their values and by their 74 * dB values. This implies that larger values must correspond with larger 75 * dB values (which is also required for all other mixer controls). 76 */ 77 /* Each item is: <min> <max> <TLV> */ 78 #define TLV_DB_RANGE_ITEM(...) \ 79 TLV_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__) 80 #define DECLARE_TLV_DB_RANGE(name, ...) \ 81 unsigned int name[] = { TLV_DB_RANGE_ITEM(__VA_ARGS__) } 82 /* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */ 83 #define TLV_DB_RANGE_HEAD(num) \ 84 SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int) 85 86 #define TLV_DB_GAIN_MUTE -9999999 87 88 #endif /* __SOUND_TLV_H */ 89