/* -*- linux-c -*-
* APM BIOS driver for Linux
* Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
*
* Initial development of this driver was funded by NEC Australia P/L
* and NEC Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* October 1995, Rik Faith (faith@cs.unc.edu):
* Minor enhancements and updates (to the patch set) for 1.3.x
* Documentation
* January 1996, Rik Faith (faith@cs.unc.edu):
* Make /proc/apm easy to format (bump driver version)
* March 1996, Rik Faith (faith@cs.unc.edu):
* Prohibit APM BIOS calls unless apm_enabled.
* (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
* April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
* Version 1.0 and 1.1
* May 1996, Version 1.2
* Feb 1998, Version 1.3
* Feb 1998, Version 1.4
* Aug 1998, Version 1.5
* Sep 1998, Version 1.6
* Nov 1998, Version 1.7
* Jan 1999, Version 1.8
* Jan 1999, Version 1.9
* Oct 1999, Version 1.10
* Nov 1999, Version 1.11
* Jan 2000, Version 1.12
* Feb 2000, Version 1.13
* Nov 2000, Version 1.14
* Oct 2001, Version 1.15
* Jan 2002, Version 1.16
* Oct 2002, Version 1.16ac
*
* History:
* 0.6b: first version in official kernel, Linux 1.3.46
* 0.7: changed /proc/apm format, Linux 1.3.58
* 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
* 0.9: only call bios if bios is present, Linux 1.3.72
* 1.0: use fixed device number, consolidate /proc/apm into this file,
* Linux 1.3.85
* 1.1: support user-space standby and suspend, power off after system
* halted, Linux 1.3.98
* 1.2: When resetting RTC after resume, take care so that the time
* is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
* <jtoth@princeton.edu>); improve interaction between
* screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
* 1.2a:Simple change to stop mysterious bug reports with SMP also added
* levels to the printk calls. APM is not defined for SMP machines.
* The new replacement for it is, but Linux doesn't yet support this.
* Alan Cox Linux 2.1.55
* 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
* 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
* Dean Gaudet <dgaudet@arctic.org>.
* C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
* 1.5: Fix segment register reloading (in case of bad segments saved
* across BIOS call).
* Stephen Rothwell
* 1.6: Cope with complier/assembler differences.
* Only try to turn off the first display device.
* Fix OOPS at power off with no APM BIOS by Jan Echternach
* <echter@informatik.uni-rostock.de>
* Stephen Rothwell
* 1.7: Modify driver's cached copy of the disabled/disengaged flags
* to reflect current state of APM BIOS.
* Chris Rankin <rankinc@bellsouth.net>
* Reset interrupt 0 timer to 100Hz after suspend
* Chad Miller <cmiller@surfsouth.com>
* Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
* Richard Gooch <rgooch@atnf.csiro.au>
* Allow boot time disabling of APM
* Make boot messages far less verbose by default
* Make asm safer
* Stephen Rothwell
* 1.8: Add CONFIG_APM_RTC_IS_GMT
* Richard Gooch <rgooch@atnf.csiro.au>
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