1/* ------------------------------------------------------------------------- */ 2/* i2c-algo-bit.h i2c driver algorithms for bit-shift adapters */ 3/* ------------------------------------------------------------------------- */ 4/* Copyright (C) 1995-99 Simon G. Vogl 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 19 MA 02110-1301 USA. */ 20/* ------------------------------------------------------------------------- */ 21 22/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even 23 Frodo Looijaard <frodol@dds.nl> */ 24 25#ifndef _LINUX_I2C_ALGO_BIT_H 26#define _LINUX_I2C_ALGO_BIT_H 27 28/* --- Defines for bit-adapters --------------------------------------- */ 29/* 30 * This struct contains the hw-dependent functions of bit-style adapters to 31 * manipulate the line states, and to init any hw-specific features. This is 32 * only used if you have more than one hw-type of adapter running. 33 */ 34struct i2c_algo_bit_data { 35 void *data; /* private data for lowlevel routines */ 36 void (*setsda) (void *data, int state); 37 void (*setscl) (void *data, int state); 38 int (*getsda) (void *data); 39 int (*getscl) (void *data); 40 int (*pre_xfer) (struct i2c_adapter *); 41 void (*post_xfer) (struct i2c_adapter *); 42 43 /* local settings */ 44 int udelay; /* half clock cycle time in us, 45 minimum 2 us for fast-mode I2C, 46 minimum 5 us for standard-mode I2C and SMBus, 47 maximum 50 us for SMBus */ 48 int timeout; /* in jiffies */ 49}; 50 51int i2c_bit_add_bus(struct i2c_adapter *); 52int i2c_bit_add_numbered_bus(struct i2c_adapter *); 53extern const struct i2c_algorithm i2c_bit_algo; 54 55#endif /* _LINUX_I2C_ALGO_BIT_H */ 56