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