i2c_smbus_read_byte_data(9) centos man page | unix.com

I2C_SMBUS_READ_BYTE_(9) 				      I2C and SMBus Subsystem					   I2C_SMBUS_READ_BYTE_(9)

NAME
       i2c_smbus_read_byte_data - SMBus "read byte" protocol

SYNOPSIS
       s32 i2c_smbus_read_byte_data(const struct i2c_client * client, u8 command);

ARGUMENTS
       client
	   Handle to slave device

       command
	   Byte interpreted by slave

DESCRIPTION
       This executes the SMBus "read byte" protocol, returning negative errno else a data byte received from the device.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   I2C_SMBUS_READ_BYTE_(9)