parport_register_driver(9) [centos man page]

PARPORT_REGISTER_DRI(9) 				       Parallel Port Devices					   PARPORT_REGISTER_DRI(9)

NAME

       parport_register_driver - register a parallel port device driver

SYNOPSIS

       int parport_register_driver(struct parport_driver * drv);

ARGUMENTS

       drv
	   structure describing the driver

DESCRIPTION

       This can be called by a parallel port device driver in order to receive notifications about ports being found in the system, as well as
       ports no longer available.

       The drv structure is allocated by the caller and must not be deallocated until after calling parport_unregister_driver.

       The driver's attach function may block. The port that attach is given will be valid for the duration of the callback, but if the driver
       wants to take a copy of the pointer it must call parport_get_port to do so. Calling parport_register_device on that port will do this for
       you.

       The driver's detach function may block. The port that detach is given will be valid for the duration of the callback, but if the driver
       wants to take a copy of the pointer it must call parport_get_port to do so.

       Returns 0 on success. Currently it always succeeds.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   PARPORT_REGISTER_DRI(9)

PARPORT_REGISTER_POR(9) 				       Parallel Port Devices					   PARPORT_REGISTER_POR(9)

NAME

       parport_register_port - register a parallel port

SYNOPSIS

       struct parport * parport_register_port(unsigned long base, int irq, int dma, struct parport_operations * ops);

ARGUMENTS

       base
	   base I/O address

       irq
	   IRQ line

       dma
	   DMA channel

       ops
	   pointer to the port driver's port operations structure

DESCRIPTION

       When a parallel port (lowlevel) driver finds a port that should be made available to parallel port device drivers, it should call
       parport_register_port. The base, irq, and dma parameters are for the convenience of port drivers, and for ports where they aren't
       meaningful needn't be set to anything special. They can be altered afterwards by adjusting the relevant members of the parport structure
       that is returned and represents the port. They should not be tampered with after calling parport_announce_port, however.

       If there are parallel port device drivers in the system that have registered themselves using parport_register_driver, they are not told
       about the port at this time; that is done by parport_announce_port.

       The ops structure is allocated by the caller, and must not be deallocated before calling parport_remove_port.

       If there is no memory to allocate a new parport structure, this function will return NULL.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   PARPORT_REGISTER_POR(9)