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 const 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 const 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
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