include/sound/tlv.h

   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 */