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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* I2C bus wrapper for WM1808 codec on SAMSUNG YP-R1
*
* Copyright (c) 2013 Lorenzo Miori
*
* 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 <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "system.h"
#include "audiohw.h"
#include "wmcodec.h"
#include "audio.h"
#include "panic.h"
#include "logf.h"
#define I2C_SLAVE 0x0703
/**
* YP-R1's kernel has ALSA implementation of the WM1808, but it
* unfortunately doesn't export any function to play with register.
* For that reason we control the I2C bus directly, letting RB driver to do the rest
* Assumption: no other ALSA applications are using the mixer!
*/
static int wmcodec_dev = -1;
/* The ONLY tested freq for now is 44100, others are just stubs!! */
const struct wmc_srctrl_entry wmc_srctrl_table[HW_NUM_FREQ] =
{
/* TODO fix PLL frequencies also for the other available rates */
[HW_FREQ_44] = /* PLL = on */
{
.plln = 3 | (1 << 3),
.pllk1 = 0x18, /* 11289600 */
.pllk2 = 0x111,
.pllk3 = 0x139,
.mclkdiv = WMC_MCLKDIV_2,
.filter = WMC_SR_48KHZ,
},
};
void audiohw_init(void)
{
/* First of all we need to open the device */
wmcodec_dev = open("/dev/i2c-1", O_RDWR);
if (wmcodec_dev < 0)
panicf("Failed to open /dev/i2c-1 device!\n");
/* Let's set the slave address and if no error we are ready!*/
int addr = 0x1a;
if (ioctl(wmcodec_dev, I2C_SLAVE, addr) < 0)
logf("Failed to set slave address!\n");
}
void wmcodec_write(int reg, int data)
{
unsigned char data2[2];
/* |aaaaaaad|dddddddd| */
data2[0] = (reg << 0x1) | ((data >> 8) & 0x1);
data2[1] = data;
if (write(wmcodec_dev, data2, 2) < 0)
panicf("I2C device write error!\n");
}
void audiohw_enable_headphone_jack(bool enable)
{
/* We don't use this facility: we have a separate GPIO for that */
(void)enable;
}
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