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 #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 */