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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 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.
*
****************************************************************************/
#ifndef _GEN_I2C_
#define _GEN_I2C_
#include <stdbool.h>
struct i2c_interface
{
void (*scl_dir)(bool out); /* Set SCL as input or output */
void (*sda_dir)(bool out); /* Set SDA as input or output */
void (*scl_out)(bool high); /* Drive SCL, might sleep on clk stretch */
void (*sda_out)(bool high); /* Drive SDA */
bool (*scl_in)(void); /* Read SCL, returns true if high */
bool (*sda_in)(void); /* Read SDA, returns true if high */
void (*delay)(int delay); /* Delay for the specified amount */
/* These are the delays specified in the I2C specification, the
time pairs to the right are the minimum 100kHz and 400kHz specs */
int delay_hd_sta; /* START SDA hold (tHD:SDA) 4.0us/0.6us */
int delay_hd_dat; /* SDA hold (tHD:DAT) 5.0us/0us */
int delay_su_dat; /* SDA setup (tSU:DAT) 250ns/100ns */
int delay_su_sto; /* STOP setup (tSU:STO) 4.0us/0.6us */
int delay_su_sta; /* Rep. START setup (tSU:STA) 4.7us/0.6us */
int delay_thigh; /* SCL high period (tHIGH) 4.0us/0.6us */
};
int i2c_add_node(const struct i2c_interface *iface);
int i2c_write_data(int bus_index, int bus_address, int address,
const unsigned char* buf, int count);
int i2c_read_data(int bus_index, int bus_address, int address,
unsigned char* buf, int count);
#endif /* _GEN_I2C_ */
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