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 4.8.                 January 2017                   PARPORT_REGISTER_POR(9)