i2c-algo-bit.h

Go to the documentation of this file.

/* ------------------------------------------------------------------------- */
/* i2c-algo-bit.h i2c driver algorithms for bit-shift adapters               */
/* ------------------------------------------------------------------------- */
/*   Copyright (C) 1995-99 Simon G. Vogl

    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 program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
    MA 02110-1301 USA.                               */
/* ------------------------------------------------------------------------- */

/* With some changes from Kyösti Mälkki <[email protected]> and even
   Frodo Looijaard <[email protected]> */

#ifndef _LINUX_I2C_ALGO_BIT_H
#define _LINUX_I2C_ALGO_BIT_H

/* --- Defines for bit-adapters --------------------------------------- */
/*
 * This struct contains the hw-dependent functions of bit-style adapters to
 * manipulate the line states, and to init any hw-specific features. This is
 * only used if you have more than one hw-type of adapter running.
 */
struct i2c_algo_bit_data {
    void *data;     /* private data for lowlevel routines */
    void (*setsda) (void *data, int state);
    void (*setscl) (void *data, int state);
    int  (*getsda) (void *data);
    int  (*getscl) (void *data);
    int  (*pre_xfer)  (struct i2c_adapter *);
    void (*post_xfer) (struct i2c_adapter *);

    /* local settings */
    int udelay;     /* half clock cycle time in us,
                   minimum 2 us for fast-mode I2C,
                   minimum 5 us for standard-mode I2C and SMBus,
                   maximum 50 us for SMBus */
    int timeout;        /* in jiffies */
};

int i2c_bit_add_bus(struct i2c_adapter *);
int i2c_bit_add_numbered_bus(struct i2c_adapter *);
extern const struct i2c_algorithm i2c_bit_algo;

#endif /* _LINUX_I2C_ALGO_BIT_H */