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