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