/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2002 by Linus Nielsen Feltzing * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "config.h" #include "stdbool.h" #include "i2c.h" #include "debug.h" #include "dac.h" #ifdef HAVE_DAC3550A static bool line_in_enabled = false; static bool dac_enabled = false; int dac_volume(unsigned int left, unsigned int right, bool deemph) { int ret = 0; unsigned char buf[3]; i2c_begin(); if (left > 0x38) left = 0x38; if (right > 0x38) right = 0x38; buf[0] = DAC_REG_WRITE | DAC_AVOL; buf[1] = (left & 0x3f) | (deemph ? 0x40 : 0); buf[2] = right & 0x3f; /* send write command */ if (i2c_write(DAC_DEV_WRITE,buf,3)) { ret = -1; } i2c_end(); return ret; } /****************************************************************** ** Bit6: 0 = 3V 1 = 5V ** Bit5: 0 = normal 1 = low power ** Bit4: 0 = AUX2 off 1 = AUX2 on ** Bit3: 0 = AUX1 off 1 = AUX1 on ** Bit2: 0 = DAC off 1 = DAC on ** Bit1: 0 = stereo 1 = mono ** Bit0: 0 = normal right amp 1 = inverted right amp ******************************************************************/ /* dac_config is called once to initialize it. we will apply our static settings because of the init flow. dac_init -> dac_line_in -> mpeg_init -> dac_config */ static int dac_config(void) { int ret = 0; unsigned char buf[2]; i2c_begin(); buf[0] = DAC_REG_WRITE | DAC_GCFG; buf[1] = (dac_enabled ? 0x04 : 0) | (line_in_enabled ? 0x08 : 0); /* send write command */ if (i2c_write(DAC_DEV_WRITE,buf,2)) { ret = -1; } i2c_end(); return ret; } void dac_enable(bool enable) { dac_enabled = enable; dac_config(); } void dac_line_in(bool enable) { line_in_enabled = enable; dac_config(); } void dac_init(void) { unsigned char buf[2]; i2c_begin(); buf[0] = DAC_REG_WRITE | DAC_SR_REG; buf[1] = 0x07; /* send write command */ i2c_write(DAC_DEV_WRITE,buf,2); i2c_end(); } #endif