107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2016 by Roman Stolyarov
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "system.h"
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#include "wm8740.h"
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#include "config.h"
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#include "audio.h"
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#include "audiohw.h"
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static void wm8740_write_reg(const int reg, const unsigned int value)
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{
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int i;
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for (i = (1<<15); i; i >>= 1) {
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udelay(1);
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wm8740_set_mc(0);
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if ((reg|value) & i) {
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wm8740_set_md(1);
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} else {
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wm8740_set_md(0);
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}
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udelay(1);
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wm8740_set_mc(1);
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}
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udelay(1);
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wm8740_set_ml(0);
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udelay(1);
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wm8740_set_mc(0);
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udelay(1);
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wm8740_set_ml(1);
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udelay(1);
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}
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static int vol_tenthdb2hw(const int tdb)
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{
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if (tdb < WM8740_VOLUME_MIN) {
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return 0x00;
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} else if (tdb > WM8740_VOLUME_MAX) {
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return 0xff;
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} else {
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return ((tdb / 5 + 0xff) & 0xff);
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}
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}
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void audiohw_set_volume(int vol_l, int vol_r)
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{
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wm8740_write_reg(WM8740_REG0, vol_tenthdb2hw(vol_l));
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wm8740_write_reg(WM8740_REG1, vol_tenthdb2hw(vol_r) | WM8740_LDR);
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}
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void audiohw_mute(void)
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{
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wm8740_write_reg(WM8740_REG2, WM8740_MUT);
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}
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void audiohw_unmute(void)
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{
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wm8740_write_reg(WM8740_REG2, 0x00);
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}
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void audiohw_init(void)
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{
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wm8740_write_reg(WM8740_REG0, 0x00);
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wm8740_write_reg(WM8740_REG1, 0x00);
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wm8740_write_reg(WM8740_REG2, WM8740_MUT);
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wm8740_write_reg(WM8740_REG3, WM8740_I2S);
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wm8740_write_reg(WM8740_REG4, 0x00);
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}
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void audiohw_preinit(void)
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{
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}
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void audiohw_set_frequency(int fsel)
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{
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(void)fsel;
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}
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void audiohw_set_filter_roll_off(int value)
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{
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/* 0 = fast (sharp);
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1 = slow */
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if (value == 0) {
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wm8740_write_reg(WM8740_REG3, WM8740_I2S);
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} else {
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wm8740_write_reg(WM8740_REG3, WM8740_I2S | WM8740_SR0);
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}
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}
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