83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/* ------------------------------------------------------------------------- */
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/* */
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/* i2c.h - definitions for the i2c-bus interface */
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/* */
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/* ------------------------------------------------------------------------- */
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/* Copyright (C) 1995-2000 Simon G. Vogl
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* ------------------------------------------------------------------------- */
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/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
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Frodo Looijaard <frodol@dds.nl> */
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/* $Id: i2c.h,v 1.1.1.1 2012/08/16 18:43:05 mfro Exp $ */
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#ifndef _I2C_H
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#define _I2C_H
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/* --- General options ------------------------------------------------ */
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struct i2c_msg;
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struct i2c_algorithm;
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struct i2c_adapter;
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/* Transfer num messages.
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*/
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extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
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/*
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* The following structs are for those who like to implement new bus drivers:
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* i2c_algorithm is the interface to a class of hardware solutions which can
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* be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
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* to name two of the most common.
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*/
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struct i2c_algorithm {
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unsigned int id;
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int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg *msgs, int num);
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/* --- ioctl like call to set div. parameters. */
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int (*algo_control)(struct i2c_adapter *, unsigned int, unsigned long);
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};
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/*
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* i2c_adapter is the structure used to identify a physical i2c bus along
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* with the access algorithms necessary to access it.
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*/
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struct i2c_adapter {
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struct i2c_algorithm *algo;/* the algorithm to access the bus */
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void *algo_data;
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int timeout;
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int retries;
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int nr;
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};
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/*
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* I2C Message - used for pure i2c transaction, also from /dev interface
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*/
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struct i2c_msg {
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unsigned short addr; /* slave address */
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unsigned short flags;
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#define I2C_M_TEN 0x10 /* we have a ten bit chip address */
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#define I2C_M_RD 0x01
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#define I2C_M_NOSTART 0x4000
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#define I2C_M_REV_DIR_ADDR 0x2000
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#define I2C_M_IGNORE_NAK 0x1000
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#define I2C_M_NO_RD_ACK 0x0800
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unsigned short len; /* msg length */
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unsigned char *buf; /* pointer to msg data */
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};
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#endif /* _I2C_H */
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