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 } 136