cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tas-basstreble.h (1453B)

      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
     16static 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
     92static 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 */
    102static 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
    128static 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}