i2c_smbus_read_byte(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 - SMBus "receive byte" protocol

SYNOPSIS
       s32 i2c_smbus_read_byte(const struct i2c_client * client);

ARGUMENTS
       client
	   Handle to slave device

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

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    I2C_SMBUS_READ_BYTE(9)