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- /*
- smbus.h - SMBus level access helper functions
- Copyright (C) 1995-97 Simon G. Vogl
- Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
- 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 <linux/types.h>
- #include <linux/i2c.h>
- 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 */
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