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@suse.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 37 #define DECLARE_TLV_DB_SCALE(name, min, step, mute) \ 38 unsigned int name[] = { \ 39 SNDRV_CTL_TLVT_DB_SCALE, 2 * sizeof(unsigned int), \ 40 (min), ((step) & 0xffff) | ((mute) ? 0x10000 : 0) \ 41 } 42 43 #endif /* __SOUND_TLV_H */ 44