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Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [sound/] [aoa/] [codecs/] [snd-aoa-codec-tas-basstreble.h] - Blame information for rev 8

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Line No. Rev Author Line
1 3 xianfeng 
/*
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 * This file is only included exactly once!
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 *
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 * The tables here are derived from the tas3004 datasheet,
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 * modulo typo corrections and some smoothing...
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 */
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#define TAS3004_TREBLE_MIN      0
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#define TAS3004_TREBLE_MAX      72
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#define TAS3004_BASS_MIN        0
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#define TAS3004_BASS_MAX        72
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#define TAS3004_TREBLE_ZERO     36
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#define TAS3004_BASS_ZERO       36
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static u8 tas3004_treble_table[] = {
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        150, /* -18 dB */
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        149,
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        148,
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        147,
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        146,
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        145,
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        144,
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        143,
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        142,
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        141,
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        140,
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        139,
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        138,
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        137,
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        136,
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        135,
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        134,
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        133,
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        132,
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        131,
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        130,
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        129,
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        128,
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        127,
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        126,
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        125,
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        124,
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        123,
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        122,
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        121,
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        120,
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        119,
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        118,
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        117,
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        116,
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        115,
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        114, /* 0 dB */
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        113,
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        112,
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        111,
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        109,
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        108,
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        107,
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        105,
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        104,
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        103,
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        101,
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        99,
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        98,
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        96,
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        93,
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        91,
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        89,
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        86,
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        83,
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        81,
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        77,
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        74,
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        71,
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        67,
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        63,
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        59,
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        54,
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        49,
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        44,
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        38,
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        32,
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        26,
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        19,
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        10,
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        4,
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        2,
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        1, /* +18 dB */
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};
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static inline u8 tas3004_treble(int idx)
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{
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        return tas3004_treble_table[idx];
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}
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/* I only save the difference here to the treble table
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 * so that the binary is smaller...
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 * I have also ignored completely differences of
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 * +/- 1
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 */
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static s8 tas3004_bass_diff_to_treble[] = {
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        2, /* 7 dB, offset 50 */
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        2,
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        2,
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        2,
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        2,
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        1,
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        2,
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        2,
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        2,
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        3,
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        4,
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        4,
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        5,
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        6,
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        7,
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        8,
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        9,
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        10,
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        11,
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        14,
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        13,
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        8,
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        1, /* 18 dB */
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};
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static inline u8 tas3004_bass(int idx)
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{
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        u8 result = tas3004_treble_table[idx];
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        if (idx >= 50)
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                result += tas3004_bass_diff_to_treble[idx-50];
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        return result;
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}

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