/*************************************************************************** * __________ __ ___. * 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