i2c_add_adapter(9) centos man page | unix.com

I2C_ADD_ADAPTER(9)					      I2C and SMBus Subsystem						I2C_ADD_ADAPTER(9)

NAME
       i2c_add_adapter - declare i2c adapter, use dynamic bus number

SYNOPSIS
       int i2c_add_adapter(struct i2c_adapter * adapter);

ARGUMENTS
       adapter
	   the adapter to add

CONTEXT
       can sleep

DESCRIPTION
       This routine is used to declare an I2C adapter when its bus number doesn't matter or when its bus number is specified by an dt alias.
       Examples of bases when the bus number doesn't matter: I2C adapters dynamically added by USB links or PCI plugin cards.

       When this returns zero, a new bus number was allocated and stored in adap->nr, and the specified adapter became available for clients.
       Otherwise, a negative errno value is returned.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							I2C_ADD_ADAPTER(9)