include/uapi/sound/tlv.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2
   3 #ifndef __UAPI_SOUND_TLV_H
   4 #define __UAPI_SOUND_TLV_H
   5
   6 #define SNDRV_CTL_TLVT_CONTAINER 0      /* one level down - group of TLVs */
   7 #define SNDRV_CTL_TLVT_DB_SCALE 1       /* dB scale */
   8 #define SNDRV_CTL_TLVT_DB_LINEAR 2      /* linear volume */
   9 #define SNDRV_CTL_TLVT_DB_RANGE 3       /* dB range container */
  10 #define SNDRV_CTL_TLVT_DB_MINMAX 4      /* dB scale with min/max */
  11 #define SNDRV_CTL_TLVT_DB_MINMAX_MUTE 5 /* dB scale with min/max with mute */
  12
  13 /*
  14  * channel-mapping TLV items
  15  *  TLV length must match with num_channels
  16  */
  17 #define SNDRV_CTL_TLVT_CHMAP_FIXED      0x101   /* fixed channel position */
  18 #define SNDRV_CTL_TLVT_CHMAP_VAR        0x102   /* channels freely swappable */
  19 #define SNDRV_CTL_TLVT_CHMAP_PAIRED     0x103   /* pair-wise swappable */
  20
  21 #define SNDRV_CTL_TLVT_FCP_CHANNEL_LABELS       0x110   /* channel labels */
  22
  23 /*
  24  * TLV structure is right behind the struct snd_ctl_tlv:
  25  *   unsigned int type          - see SNDRV_CTL_TLVT_*
  26  *   unsigned int length
  27  *   .... data aligned to sizeof(unsigned int), use
  28  *        block_length = (length + (sizeof(unsigned int) - 1)) &
  29  *                       ~(sizeof(unsigned int) - 1)) ....
  30  */
  31 #define SNDRV_CTL_TLVD_ITEM(type, ...) \
  32         (type), SNDRV_CTL_TLVD_LENGTH(__VA_ARGS__), __VA_ARGS__
  33 #define SNDRV_CTL_TLVD_LENGTH(...) \
  34         ((unsigned int)sizeof((const unsigned int[]) { __VA_ARGS__ }))
  35
  36 /* Accessor offsets for TLV data items */
  37 #define SNDRV_CTL_TLVO_TYPE             0
  38 #define SNDRV_CTL_TLVO_LEN              1
  39
  40 #define SNDRV_CTL_TLVD_CONTAINER_ITEM(...) \
  41         SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_CONTAINER, __VA_ARGS__)
  42 #define SNDRV_CTL_TLVD_DECLARE_CONTAINER(name, ...) \
  43         unsigned int name[] = { \
  44                 SNDRV_CTL_TLVD_CONTAINER_ITEM(__VA_ARGS__) \
  45         }
  46
  47 #define SNDRV_CTL_TLVD_DB_SCALE_MASK    0xffff
  48 #define SNDRV_CTL_TLVD_DB_SCALE_MUTE    0x10000
  49 #define SNDRV_CTL_TLVD_DB_SCALE_ITEM(min, step, mute) \
  50         SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_SCALE, \
  51                             (min), \
  52                             ((step) & SNDRV_CTL_TLVD_DB_SCALE_MASK) | \
  53                              ((mute) ? SNDRV_CTL_TLVD_DB_SCALE_MUTE : 0))
  54 #define SNDRV_CTL_TLVD_DECLARE_DB_SCALE(name, min, step, mute) \
  55         unsigned int name[] = { \
  56                 SNDRV_CTL_TLVD_DB_SCALE_ITEM(min, step, mute) \
  57         }
  58
  59 /* Accessor offsets for min, mute and step items in dB scale type TLV */
  60 #define SNDRV_CTL_TLVO_DB_SCALE_MIN             2
  61 #define SNDRV_CTL_TLVO_DB_SCALE_MUTE_AND_STEP   3
  62
  63 /* dB scale specified with min/max values instead of step */
  64 #define SNDRV_CTL_TLVD_DB_MINMAX_ITEM(min_dB, max_dB) \
  65         SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_MINMAX, (min_dB), (max_dB))
  66 #define SNDRV_CTL_TLVD_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) \
  67         SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_MINMAX_MUTE, (min_dB), (max_dB))
  68 #define SNDRV_CTL_TLVD_DECLARE_DB_MINMAX(name, min_dB, max_dB) \
  69         unsigned int name[] = { \
  70                 SNDRV_CTL_TLVD_DB_MINMAX_ITEM(min_dB, max_dB) \
  71         }
  72 #define SNDRV_CTL_TLVD_DECLARE_DB_MINMAX_MUTE(name, min_dB, max_dB) \
  73         unsigned int name[] = { \
  74                 SNDRV_CTL_TLVD_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) \
  75         }
  76
  77 /* Accessor offsets for min, max items in db-minmax types of TLV. */
  78 #define SNDRV_CTL_TLVO_DB_MINMAX_MIN    2
  79 #define SNDRV_CTL_TLVO_DB_MINMAX_MAX    3
  80
  81 /* linear volume between min_dB and max_dB (.01dB unit) */
  82 #define SNDRV_CTL_TLVD_DB_LINEAR_ITEM(min_dB, max_dB) \
  83         SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_LINEAR, (min_dB), (max_dB))
  84 #define SNDRV_CTL_TLVD_DECLARE_DB_LINEAR(name, min_dB, max_dB) \
  85         unsigned int name[] = { \
  86                 SNDRV_CTL_TLVD_DB_LINEAR_ITEM(min_dB, max_dB) \
  87         }
  88
  89 /* Accessor offsets for min, max items in db-linear type of TLV. */
  90 #define SNDRV_CTL_TLVO_DB_LINEAR_MIN    2
  91 #define SNDRV_CTL_TLVO_DB_LINEAR_MAX    3
  92
  93 /* dB range container:
  94  * Items in dB range container must be ordered by their values and by their
  95  * dB values. This implies that larger values must correspond with larger
  96  * dB values (which is also required for all other mixer controls).
  97  */
  98 /* Each item is: <min> <max> <TLV> */
  99 #define SNDRV_CTL_TLVD_DB_RANGE_ITEM(...) \
 100         SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__)
 101 #define SNDRV_CTL_TLVD_DECLARE_DB_RANGE(name, ...) \
 102         unsigned int name[] = { \
 103                 SNDRV_CTL_TLVD_DB_RANGE_ITEM(__VA_ARGS__) \
 104         }
 105
 106 #define SNDRV_CTL_TLVD_DB_GAIN_MUTE     -9999999
 107
 108 #endif