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ieee1284_get_irq_fd(3) [centos man page]

IEEE1284_GET_IRQ_FD(3)						     Functions						    IEEE1284_GET_IRQ_FD(3)

NAME
ieee1284_get_irq_fd, ieee1284_clear_irq - interrupt notification SYNOPSIS
#include <ieee1284.h> int ieee1284_get_irq_fd(struct parport *port); int ieee1284_clear_irq(struct parport *port, unsigned int *count); DESCRIPTION
If the port has a configured interrupt line and the port type supports interrupt notification, it is possible to obtain a file descriptor that may be used for select(2) or poll(2). Any event (readable, writable or exception) means that an interrupt has been triggered. No operations other than select or poll may be performed on the file descriptor. The port must be open in order to call ieee1284_get_irq_fd, and must be claimed when using select or poll. The caller must not close the file descriptor, and may not use it at all when the port is not claimed. When an interrupt has been detected, the caller must call ieee1284_clear_irq to clear the interrupt condition, at which point the number of interrupts raised can be obtained by supplying a non-NULLcount. RETURN VALUE
For ieee1284_get_irq_fd: If the return value is negative then it is an error code listed below. Otherwise it is a valid file descriptor. E1284_NOTAVAIL No such file descriptor is available. E1284_INVALIDPORT The port parameter is invalid (for instance, perhaps the port is not open). For ieee1284_clear_irq: E1284_OK The interrupt has been cleared. If count was not NULL the count of interrupts has been atomically stored to count and reset. E1284_NOTAVAIL The count parameter was not NULL but interrupt counting is not supported on this type of port. The interrupt has been cleared. E1284_SYS There was a problem clearing the interrupt. E1284_INVALIDPORT The port parameter is invalid (for instance, perhaps the port is not claimed). AUTHOR
Tim Waugh <twaugh@redhat.com> Author. COPYRIGHT
Copyright (C) 2001-2003 Tim Waugh [FIXME: source] 06/17/2014 IEEE1284_GET_IRQ_FD(3)

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IEEE1284_OPEN(3)						     Functions							  IEEE1284_OPEN(3)

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. SEE ALSO
ieee1284_close(3) AUTHOR
Tim Waugh <twaugh@redhat.com> Author. COPYRIGHT
Copyright (C) 2001-2003 Tim Waugh [FIXME: source] 06/17/2014 IEEE1284_OPEN(3)
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