centos man page for input_register_device

INPUT_REGISTER_DEVIC(9) 					  Input Subsystem					   INPUT_REGISTER_DEVIC(9)

NAME
       input_register_device - register device with input core

SYNOPSIS
       int input_register_device(struct input_dev * dev);

ARGUMENTS
       dev
	   device to be registered

DESCRIPTION
       This function registers device with input core. The device must be allocated with input_allocate_device and all it's capabilities set up
       before registering. If function fails the device must be freed with input_free_device. Once device has been successfully registered it can
       be unregistered with input_unregister_device; input_free_device should not be called in this case.

       Note that this function is also used to register managed input devices (ones allocated with devm_input_allocate_device). Such managed input
       devices need not be explicitly unregistered or freed, their tear down is controlled by the devres infrastructure. It is also worth noting
       that tear down of managed input devices is internally a 2-step process: registered managed input device is first unregistered, but stays in
       memory and can still handle input_event calls (although events will not be delivered anywhere). The freeing of managed input device will
       happen later, when devres stack is unwound to the point where device allocation was made.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   INPUT_REGISTER_DEVIC(9)