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parport_register_port(9) [centos man page]

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)

Check Out this Related Man Page

IEEE1284_DATA(3)						     Functions							  IEEE1284_DATA(3)

NAME
ieee1284_read_data, ieee1284_write_data, ieee1284_data_dir, ieee1284_wait_data - control the data lines SYNOPSIS
#include <ieee1284.h> int ieee1284_read_data(struct parport *port); void ieee1284_write_data(struct parport *port, unsigned char dt); int ieee1284_data_dir(struct parport *port, int reverse); int ieee1284_wait_data(struct parport *port, unsigned char mask, unsigned char val, struct timeval *timeout); DESCRIPTION
These functions manipulate the data lines of the parallel port associated with port (which must have been claimed using ieee1284_claim(3)). The lines are represented by an 8-bit number (one line per bit) and a direction. The data lines are driven as a group; they may be all host-driven (forward direction) or not (reverse direction). When the peripheral is driving them the host must not. For ieee1284_data_dir the reverse parameter should be zero to turn the data line drivers on and non-zero to turn them off. Some port types may be unable to switch off the data line drivers. Setting the data lines may have side effects on some port types (for example, some Amiga ports pulse nStrobe). ieee1284_wait_data waits, up until the timeout, for the data bits specified in mask to have the corresponding values in val. RETURN VALUE
ieee1284_read_data returns the 8-bit number representing the data lines unless it is not possible to return such a value with this port type, in which case it returns an error code. Possible error codes: E1284_NOTAVAIL Bi-directional data lines are not available on this system. E1284_INVALIDPORT The port parameter is invalid (perhaps it has not been claimed, for instance). E1284_SYS There was an error at the operating system level, and errno has been set accordingly. E1284_TIMEDOUT The timeout has elapsed. Whereas ieee1284_read_data may return E1284_NOTAVAIL on its first invocation on the port, if it does not do so then it cannot until ieee1284_close is called for that port. AUTHOR
Tim Waugh <twaugh@redhat.com> Author. COPYRIGHT
Copyright (C) 2001-2003 Tim Waugh [FIXME: source] 06/17/2014 IEEE1284_DATA(3)
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