sound/aoa/codecs/tas-basstreble.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * This file is only included exactly once!
   4  *
   5  * The tables here are derived from the tas3004 datasheet,
   6  * modulo typo corrections and some smoothing...
   7  */
   8
   9 #define TAS3004_TREBLE_MIN      0
  10 #define TAS3004_TREBLE_MAX      72
  11 #define TAS3004_BASS_MIN        0
  12 #define TAS3004_BASS_MAX        72
  13 #define TAS3004_TREBLE_ZERO     36
  14 #define TAS3004_BASS_ZERO       36
  15
  16 static u8 tas3004_treble_table[] = {
  17         150, /* -18 dB */
  18         149,
  19         148,
  20         147,
  21         146,
  22         145,
  23         144,
  24         143,
  25         142,
  26         141,
  27         140,
  28         139,
  29         138,
  30         137,
  31         136,
  32         135,
  33         134,
  34         133,
  35         132,
  36         131,
  37         130,
  38         129,
  39         128,
  40         127,
  41         126,
  42         125,
  43         124,
  44         123,
  45         122,
  46         121,
  47         120,
  48         119,
  49         118,
  50         117,
  51         116,
  52         115,
  53         114, /* 0 dB */
  54         113,
  55         112,
  56         111,
  57         109,
  58         108,
  59         107,
  60         105,
  61         104,
  62         103,
  63         101,
  64         99,
  65         98,
  66         96,
  67         93,
  68         91,
  69         89,
  70         86,
  71         83,
  72         81,
  73         77,
  74         74,
  75         71,
  76         67,
  77         63,
  78         59,
  79         54,
  80         49,
  81         44,
  82         38,
  83         32,
  84         26,
  85         19,
  86         10,
  87         4,
  88         2,
  89         1, /* +18 dB */
  90 };
  91
  92 static inline u8 tas3004_treble(int idx)
  93 {
  94         return tas3004_treble_table[idx];
  95 }
  96
  97 /* I only save the difference here to the treble table
  98  * so that the binary is smaller...
  99  * I have also ignored completely differences of
 100  * +/- 1
 101  */
 102 static s8 tas3004_bass_diff_to_treble[] = {
 103         2, /* 7 dB, offset 50 */
 104         2,
 105         2,
 106         2,
 107         2,
 108         1,
 109         2,
 110         2,
 111         2,
 112         3,
 113         4,
 114         4,
 115         5,
 116         6,
 117         7,
 118         8,
 119         9,
 120         10,
 121         11,
 122         14,
 123         13,
 124         8,
 125         1, /* 18 dB */
 126 };
 127
 128 static inline u8 tas3004_bass(int idx)
 129 {
 130         u8 result = tas3004_treble_table[idx];
 131
 132         if (idx >= 50)
 133                 result += tas3004_bass_diff_to_treble[idx-50];
 134         return result;
 135 }