#ifndef __SOUND_TLV_H
  #define __SOUND_TLV_H
  
  /*
   *  Advanced Linux Sound Architecture - ALSA - Driver

   *  Copyright (c) 2006 by Jaroslav Kysela <perex@perex.cz>

   *
   *
   *   This program is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation; either version 2 of the License, or
   *   (at your option) any later version.
   *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *   GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program; if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   *
   */
  
  /*
   * TLV structure is right behind the struct snd_ctl_tlv:
   *   unsigned int type  	- see SNDRV_CTL_TLVT_*
   *   unsigned int length
   *   .... data aligned to sizeof(unsigned int), use
   *        block_length = (length + (sizeof(unsigned int) - 1)) &
   *                       ~(sizeof(unsigned int) - 1)) ....
   */
  
  #define SNDRV_CTL_TLVT_CONTAINER 0	/* one level down - group of TLVs */
  #define SNDRV_CTL_TLVT_DB_SCALE	1       /* dB scale */

  #define SNDRV_CTL_TLVT_DB_LINEAR 2	/* linear volume */

  #define SNDRV_CTL_TLVT_DB_RANGE 3	/* dB range container */

  #define SNDRV_CTL_TLVT_DB_MINMAX 4	/* dB scale with min/max */
  #define SNDRV_CTL_TLVT_DB_MINMAX_MUTE 5	/* dB scale with min/max with mute */

  #define TLV_DB_SCALE_MASK	0xffff
  #define TLV_DB_SCALE_MUTE	0x10000

  #define TLV_DB_SCALE_ITEM(min, step, mute)			\
  	SNDRV_CTL_TLVT_DB_SCALE, 2 * sizeof(unsigned int),	\

  	(min), ((step) & TLV_DB_SCALE_MASK) | ((mute) ? TLV_DB_SCALE_MUTE : 0)

  #define DECLARE_TLV_DB_SCALE(name, min, step, mute) \

  	unsigned int name[] = { TLV_DB_SCALE_ITEM(min, step, mute) }

  /* dB scale specified with min/max values instead of step */
  #define TLV_DB_MINMAX_ITEM(min_dB, max_dB)			\
  	SNDRV_CTL_TLVT_DB_MINMAX, 2 * sizeof(unsigned int),	\
  	(min_dB), (max_dB)
  #define TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB)			\
  	SNDRV_CTL_TLVT_DB_MINMAX_MUTE, 2 * sizeof(unsigned int),	\
  	(min_dB), (max_dB)
  #define DECLARE_TLV_DB_MINMAX(name, min_dB, max_dB) \
  	unsigned int name[] = { TLV_DB_MINMAX_ITEM(min_dB, max_dB) }
  #define DECLARE_TLV_DB_MINMAX_MUTE(name, min_dB, max_dB) \
  	unsigned int name[] = { TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) }

  /* linear volume between min_dB and max_dB (.01dB unit) */

  #define TLV_DB_LINEAR_ITEM(min_dB, max_dB)		    \
  	SNDRV_CTL_TLVT_DB_LINEAR, 2 * sizeof(unsigned int), \
  	(min_dB), (max_dB)

  #define DECLARE_TLV_DB_LINEAR(name, min_dB, max_dB)	\

  	unsigned int name[] = { TLV_DB_LINEAR_ITEM(min_dB, max_dB) }
  
  /* dB range container */
  /* Each item is: <min> <max> <TLV> */
  /* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */
  #define TLV_DB_RANGE_HEAD(num)			\
  	SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int)

  
  #define TLV_DB_GAIN_MUTE	-9999999

  #endif /* __SOUND_TLV_H */