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., 675 Mass Ave, Cambridge, MA 02139, USA. */ 19/* ------------------------------------------------------------------------- */ 20 21/* With some changes from Ky��sti M��lkki <kmalkki@cc.hut.fi> and even 22 Frodo Looijaard <frodol@dds.nl> */ 23 24#ifndef _LINUX_I2C_ALGO_BIT_H 25#define _LINUX_I2C_ALGO_BIT_H 26 27/* --- Defines for bit-adapters --------------------------------------- */ 28/* 29 * This struct contains the hw-dependent functions of bit-style adapters to 30 * manipulate the line states, and to init any hw-specific features. This is 31 * only used if you have more than one hw-type of adapter running. 32 */ 33struct i2c_algo_bit_data { 34 void *data; /* private data for lowlevel routines */ 35 void (*setsda) (void *data, int state); 36 void (*setscl) (void *data, int state); 37 int (*getsda) (void *data); 38 int (*getscl) (void *data); 39 int (*pre_xfer) (struct i2c_adapter *); 40 void (*post_xfer) (struct i2c_adapter *); 41 42 /* local settings */ 43 int udelay; /* half clock cycle time in us, 44 minimum 2 us for fast-mode I2C, 45 minimum 5 us for standard-mode I2C and SMBus, 46 maximum 50 us for SMBus */ 47 int timeout; /* in jiffies */ 48}; 49 50int i2c_bit_add_bus(struct i2c_adapter *); 51int i2c_bit_add_numbered_bus(struct i2c_adapter *); 52 53#endif /* _LINUX_I2C_ALGO_BIT_H */ 54