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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2009 by Bertrik Sikken
*
* 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.
*
****************************************************************************/
/*
FM radio i2c interface, allows the radio driver to talk to the tuner chip.
It is implemented using the generic i2c driver, which does "bit-banged"
I2C with a couple of GPIO pins.
*/
#include "config.h"
#include "inttypes.h"
#include "s5l8700.h"
#include "generic_i2c.h"
#include "fmradio_i2c.h"
#define I2C_GPIO PDAT3
#define I2C_GPIO_DIR PCON3
#define I2C_SCL_PIN 4
#define I2C_SDA_PIN 2
#define SCL_DIR_MASK (0xF<<(4*I2C_SCL_PIN))
#define SCL_DIR_OUT (1<<(4*I2C_SCL_PIN))
#define SCL_DIR_IN 0
#define SDA_DIR_MASK (0xF<<(4*I2C_SDA_PIN))
#define SDA_DIR_OUT (1<<(4*I2C_SDA_PIN))
#define SDA_DIR_IN 0
static int fm_i2c_bus;
static void fm_scl_hi(void)
{
I2C_GPIO |= 1 << I2C_SCL_PIN;
}
static void fm_scl_lo(void)
{
I2C_GPIO &= ~(1 << I2C_SCL_PIN);
}
static void fm_sda_hi(void)
{
I2C_GPIO |= 1 << I2C_SDA_PIN;
}
static void fm_sda_lo(void)
{
I2C_GPIO &= ~(1 << I2C_SDA_PIN);
}
static void fm_sda_input(void)
{
I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SDA_DIR_MASK) | SDA_DIR_IN;
}
static void fm_sda_output(void)
{
I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SDA_DIR_MASK) | SDA_DIR_OUT;
}
static void fm_scl_input(void)
{
I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SCL_DIR_MASK) | SCL_DIR_IN;
}
static void fm_scl_output(void)
{
I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SCL_DIR_MASK) | SCL_DIR_OUT;
}
static int fm_sda(void)
{
return (I2C_GPIO & (1 << I2C_SDA_PIN));
}
static int fm_scl(void)
{
return (I2C_GPIO & (1 << I2C_SCL_PIN));
}
/* simple and crude delay, used for all delays in the generic i2c driver */
static void fm_delay(void)
{
volatile int i;
/* this loop is uncalibrated and could use more sophistication */
for (i = 0; i < 20; i++) {
}
}
/* interface towards the generic i2c driver */
static const struct i2c_interface fm_i2c_interface = {
.scl_hi = fm_scl_hi,
.scl_lo = fm_scl_lo,
.sda_hi = fm_sda_hi,
.sda_lo = fm_sda_lo,
.sda_input = fm_sda_input,
.sda_output = fm_sda_output,
.scl_input = fm_scl_input,
.scl_output = fm_scl_output,
.scl = fm_scl,
.sda = fm_sda,
.delay_hd_sta = fm_delay,
.delay_hd_dat = fm_delay,
.delay_su_dat = fm_delay,
.delay_su_sto = fm_delay,
.delay_su_sta = fm_delay,
.delay_thigh = fm_delay
};
/* initialise i2c for fmradio */
void fmradio_i2c_init(void)
{
fm_i2c_bus = i2c_add_node(&fm_i2c_interface);
}
int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
{
return i2c_write_data(fm_i2c_bus, address, -1, buf, count);
}
int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
return i2c_read_data(fm_i2c_bus, address, -1, buf, count);
}
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