The Linux 2.4 Parallel Port Subsystem

Tim Waugh

      twaugh@redhat.com
     

Copyright © 1999-2000 by Tim Waugh

Table of Contents
Design goals
The problems
The solutions
Standard transfer modes
Structure
Sharing core
Parports and their overrides
IEEE 1284 transfer modes
Pardevices and parport_drivers
The IEEE 1284.3 API
Device driver's view
Port drivers
The printer driver
User-level device drivers
Introduction to ppdev
User-level or kernel-level driver?
Programming interface
Starting and stopping: open and close
Control: ioctl
Transferring data: read and write
Waiting for events: poll and select
Examples
Linux parallel port driver API reference
parport_device_num --  convert device coordinates
parport_device_coords --  convert canonical device number
parport_find_device --  find a specific device
parport_find_class --  find a device in a specified class
parport_register_driver --  register a parallel port device driver
parport_unregister_driver --  deregister a parallel port device driver
parport_get_port --  increment a port's reference count
parport_put_port --  decrement a port's reference count
parport_find_number --  find a parallel port by number
parport_find_base --  find a parallel port by base address
parport_register_device --  register a device on a parallel port
parport_unregister_device --  deregister a device on a parallel port
parport_open --  find a device by canonical device number
parport_close --  close a device opened with parport_open
parport_claim --  claim access to a parallel port device
parport_claim_or_block --  claim access to a parallel port device
parport_release --  give up access to a parallel port device
parport_yield --  relinquish a parallel port temporarily
parport_yield_blocking --  relinquish a parallel port temporarily
parport_negotiate --  negotiate an IEEE 1284 mode
parport_write --  write a block of data to a parallel port
parport_read --  read a block of data from a parallel port
parport_set_timeout --  set the inactivity timeout for a device
The Linux 2.2 Parallel Port Subsystem
GNU Free Documentation License
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