i2c_smbus_write_byte(9) centos man page | unix.com

I2C_SMBUS_WRITE_BYTE(9) 				      I2C and SMBus Subsystem					   I2C_SMBUS_WRITE_BYTE(9)

NAME
       i2c_smbus_write_byte - SMBus "send byte" protocol

SYNOPSIS
       s32 i2c_smbus_write_byte(const struct i2c_client * client, u8 value);

ARGUMENTS
       client
	   Handle to slave device

       value
	   Byte to be sent

DESCRIPTION
       This executes the SMBus "send byte" protocol, returning negative errno else zero on success.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   I2C_SMBUS_WRITE_BYTE(9)