'\" t
.\"     Title: parport_register_port
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Parallel Port Devices
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "PARPORT_REGISTER_POR" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Parallel Port Devices"
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.SH "NAME"
parport_register_port \- register a parallel port
.SH "SYNOPSIS"
.HP \w'struct\ parport\ *\ parport_register_port('u
.BI "struct parport * parport_register_port(unsigned\ long\ " "base" ", int\ " "irq" ", int\ " "dma" ", struct\ parport_operations\ *\ " "ops" ");"
.SH "ARGUMENTS"
.PP
\fIbase\fR
.RS 4
base I/O address
.RE
.PP
\fIirq\fR
.RS 4
IRQ line
.RE
.PP
\fIdma\fR
.RS 4
DMA channel
.RE
.PP
\fIops\fR
.RS 4
pointer to the port driver\*(Aqs port operations structure
.RE
.SH "DESCRIPTION"
.PP
When a parallel port (lowlevel) driver finds a port that should be made available to parallel port device drivers, it should call
\fBparport_register_port\fR\&. The
\fIbase\fR,
\fIirq\fR, and
\fIdma\fR
parameters are for the convenience of port drivers, and for ports where they aren\*(Aqt meaningful needn\*(Aqt 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\&.
.PP
If there are parallel port device drivers in the system that have registered themselves using
\fBparport_register_driver\fR, they are not told about the port at this time; that is done by
\fBparport_announce_port\fR\&.
.PP
The
\fIops\fR
structure is allocated by the caller, and must not be deallocated before calling
\fBparport_remove_port\fR\&.
.PP
If there is no memory to allocate a new parport structure, this function will return
\fBNULL\fR\&.
.SH "COPYRIGHT"
.br