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TOMOYO Linux Cross Reference
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  * Items in dB range container must be ordered by their values and by their
 79  * dB values. This implies that larger values must correspond with larger
 80  * dB values (which is also required for all other mixer controls).
 81  */
 82 /* Each item is: <min> <max> <TLV> */
 83 #define TLV_DB_RANGE_ITEM(...) \
 84         TLV_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__)
 85 #define DECLARE_TLV_DB_RANGE(name, ...) \
 86         unsigned int name[] = { TLV_DB_RANGE_ITEM(__VA_ARGS__) }
 87 /* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */
 88 #define TLV_DB_RANGE_HEAD(num)                  \
 89         SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int)
 90 
 91 #define TLV_DB_GAIN_MUTE        -9999999
 92 
 93 /*
 94  * channel-mapping TLV items
 95  *  TLV length must match with num_channels
 96  */
 97 #define SNDRV_CTL_TLVT_CHMAP_FIXED      0x101   /* fixed channel position */
 98 #define SNDRV_CTL_TLVT_CHMAP_VAR        0x102   /* channels freely swappable */
 99 #define SNDRV_CTL_TLVT_CHMAP_PAIRED     0x103   /* pair-wise swappable */
100 
101 #endif /* __SOUND_TLV_H */
102 

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