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 driverīs 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 arenīt meaningful
neednīt 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.