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52 lines
2.0 KiB
52 lines
2.0 KiB
/*
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smbus.h - SMBus level access helper functions
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Copyright (C) 1995-1997 Simon G. Vogl
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Copyright (C) 1998-1999 Frodo Looijaard <frodol@dds.nl>
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Copyright (C) 2012-2017 Jean Delvare <jdelvare@suse.de>
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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*/
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#ifndef LIB_I2C_SMBUS_H
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#define LIB_I2C_SMBUS_H
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#define I2C_API_VERSION 0x100
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#include <linux/types.h>
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#include <linux/i2c.h>
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extern __s32 i2c_smbus_access(int file, char read_write, __u8 command,
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int size, union i2c_smbus_data *data);
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extern __s32 i2c_smbus_write_quick(int file, __u8 value);
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extern __s32 i2c_smbus_read_byte(int file);
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extern __s32 i2c_smbus_write_byte(int file, __u8 value);
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extern __s32 i2c_smbus_read_byte_data(int file, __u8 command);
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extern __s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value);
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extern __s32 i2c_smbus_read_word_data(int file, __u8 command);
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extern __s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value);
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extern __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value);
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/* Returns the number of read bytes */
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extern __s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values);
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extern __s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length,
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const __u8 *values);
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/* Returns the number of read bytes */
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/* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you
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ask for less than 32 bytes, your code will only work with kernels
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2.6.23 and later. */
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extern __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, __u8 length,
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__u8 *values);
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extern __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 length,
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const __u8 *values);
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/* Returns the number of read bytes */
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extern __s32 i2c_smbus_block_process_call(int file, __u8 command, __u8 length,
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__u8 *values);
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#endif /* LIB_I2C_SMBUS_H */
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