/* smbus.h - SMBus level access helper functions Copyright (C) 1995-97 Simon G. Vogl Copyright (C) 1998-99 Frodo Looijaard 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. */ #ifndef LIB_I2C_SMBUS_H #define LIB_I2C_SMBUS_H #define I2C_API_VERSION 0x100 #include #include extern __s32 i2c_smbus_access(int file, char read_write, __u8 command, int size, union i2c_smbus_data *data); extern __s32 i2c_smbus_write_quick(int file, __u8 value); extern __s32 i2c_smbus_read_byte(int file); extern __s32 i2c_smbus_write_byte(int file, __u8 value); extern __s32 i2c_smbus_read_byte_data(int file, __u8 command); extern __s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value); extern __s32 i2c_smbus_read_word_data(int file, __u8 command); extern __s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value); extern __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value); /* Returns the number of read bytes */ extern __s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values); extern __s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length, const __u8 *values); /* Returns the number of read bytes */ /* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you ask for less than 32 bytes, your code will only work with kernels 2.6.23 and later. */ extern __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, __u8 length, __u8 *values); extern __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 length, const __u8 *values); /* Returns the number of read bytes */ extern __s32 i2c_smbus_block_process_call(int file, __u8 command, __u8 length, __u8 *values); #endif /* LIB_I2C_SMBUS_H */