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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_
struct i2c_interface
{
unsigned char address; /* Address of the chip that this interface
describes */
void (*scl_hi)(void); /* Drive SCL high, might sleep on clk stretch */
void (*scl_lo)(void); /* Drive SCL low */
void (*sda_hi)(void); /* Drive SDA high */
void (*sda_lo)(void); /* Drive SDA low */
void (*sda_input)(void); /* Set SDA as input */
void (*sda_output)(void); /* Set SDA as output */
void (*scl_input)(void); /* Set SCL as input */
void (*scl_output)(void); /* Set SCL as output */
int (*scl)(void); /* Read SCL, returns 0 or non-zero */
int (*sda)(void); /* Read SDA, returns 0 or non-zero */
/* These are the delays specified in the I2C specification, the
time pairs to the right are the minimum 100kHz and 400kHz specs */
void (*delay_hd_sta)(void); /* START SDA hold (tHD:SDA) 4.0us/0.6us */
void (*delay_hd_dat)(void); /* SDA hold (tHD:DAT) 5.0us/0us */
void (*delay_su_dat)(void); /* SDA setup (tSU:DAT) 250ns/100ns */
void (*delay_su_sto)(void); /* STOP setup (tSU:STO) 4.0us/0.6us */
void (*delay_su_sta)(void); /* Rep. START setup (tSU:STA) 4.7us/0.6us */
void (*delay_thigh)(void); /* SCL high period (tHIGH) 4.0us/0.6us */
};
extern void i2c_add_node(struct i2c_interface *iface);
extern int i2c_write_data(int bus_address, int address,
const unsigned char* buf, int count);
extern int i2c_read_data(int bus_address, int address,
unsigned char* buf, int count);
#endif
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