linux/include/sound/tlv.h
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   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/* Each item is: <min> <max> <TLV> */
  79#define TLV_DB_RANGE_ITEM(...) \
  80        TLV_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__)
  81#define DECLARE_TLV_DB_RANGE(name, ...) \
  82        unsigned int name[] = { TLV_DB_RANGE_ITEM(__VA_ARGS__) }
  83/* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */
  84#define TLV_DB_RANGE_HEAD(num)                  \
  85        SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int)
  86
  87#define TLV_DB_GAIN_MUTE        -9999999
  88
  89#endif /* __SOUND_TLV_H */
  90
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