Ubuntu Manpage: ieee1284_open

Provided by: libieee1284-3-dev_0.2.11-13_amd64

NAME

       ieee1284_open - open a port

SYNOPSIS

       #include <ieee1284.h>

       int ieee1284_open(struct parport *port, int flags, int *capabilities);

DESCRIPTION

In order to begin using a port it must be opened. Any initial set-up of the port is done
at this stage. When an open port is no longer needed it should be closed with
ieee1284_close(3).

The possible flags are:

F1284_EXCL
This device cannot share the port with any other device. If this is the case it must
be declared at this stage, so that other drivers trying to access the port know not to
bother; otherwise they will wait until this driver releases the port, i.e. never.

The iopl/dev-port access methods don't support this yet, but the ppdev ones do.

If capabilities is not NULL it must point to storage for an int, which will be treated as
a set of flags, one per bit, which the library sets or clears as appropriate. If a
capability is present it will be used when asked for. They are:

CAP1284_RAW
Pin-level access is available. If this capability is present then the following
functions are effective: ieee1284_write_data, ieee1284_read_status,
ieee1284_wait_status, ieee1284_write_control, ieee1284_read_control,
ieee1284_frob_control.

CAP1284_NIBBLE
There is an implementation of nibble mode for this port.

CAP1284_BYTE
There is an implementation of byte mode for this port.

CAP1284_COMPAT
There is an implementation of compatibility mode for this port.

CAP1284_ECP
There is a hardware implementation of ECP mode for this port.

CAP1284_ECPRLE
There is an RLE-aware implementation of ECP mode for this port (the F1284_RLE flag is
recognised by the ECP transfer functions).

CAP1284_ECPSWE
There is a software implementation of ECP mode for this port.

CAP1284_BECP
There is an implementation of bounded ECP mode for this port.

CAP1284_EPP
There is a hardware implementation of EPP mode for this port.

CAP1284_EPPSWE
There is a software implementation of EPP mode for this port.

CAP1284_IRQ
An interrupt line is configured for this port and interrupt notifications can be
received using ieee1284_get_irq_fd(3).

CAP1284_DMA
A DMA channel is configured for this port.

RETURN VALUE

       E1284_OK
           The port is now opened.

       E1284_INIT
           There was a problem during port initialization. This could be because another driver
           has opened the port exclusively, or some other reason.

       E1284_NOMEM
           There is not enough memory.

       E1284_NOTAVAIL
           One or more of the supplied flags is not supported by this type of port.

       E1284_INVALIDPORT
           The port parameter is invalid (for instance, the port may already be open).

       E1284_SYS
           There was a problem at the operating system level. The global variable errno has been
           set appropriately.

AUTHOR

       Tim Waugh <twaugh@redhat.com>
           Author.

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