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 Kyösti Mälkki <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 */ 33 struct 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 40 /* local settings */ 41 int udelay; /* half clock cycle time in us, 42 minimum 2 us for fast-mode I2C, 43 minimum 5 us for standard-mode I2C and SMBus, 44 maximum 50 us for SMBus */ 45 int timeout; /* in jiffies */ 46 }; 47 48 int i2c_bit_add_bus(struct i2c_adapter *); 49 int i2c_bit_add_numbered_bus(struct i2c_adapter *); 50 51 #endif /* _LINUX_I2C_ALGO_BIT_H */ 52