Merge with Linux 2.1.131 plus some more MIPS goodies.

1 files changed, 1433 insertions, 0 deletions

diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
new file mode 100644
index 000000000..1cbc824f5
--- /dev/null
+++ b/arch/i386/kernel/apm.c
@@ -0,0 +1,1433 @@
+/* -*- linux-c -*-
+ * APM BIOS driver for Linux
+ * Copyright 1994-1998 Stephen Rothwell
+ *                     (Stephen.Rothwell@canb.auug.org.au)
+ * 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 (Stephen.Rothwell@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
+ *
+ * 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 replacment 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
+ *
+ * APM 1.1 Reference:
+ *
+ *   Intel Corporation, Microsoft Corporation. Advanced Power Management
+ *   (APM) BIOS Interface Specification, Revision 1.1, September 1993.
+ *   Intel Order Number 241704-001.  Microsoft Part Number 781-110-X01.
+ *
+ * [This document is available free from Intel by calling 800.628.8686 (fax
+ * 916.356.6100) or 800.548.4725; or via anonymous ftp from
+ * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc.  It is also
+ * available from Microsoft by calling 206.882.8080.]
+ *
+ * APM 1.2 Reference:
+ *   Intel Corporation, Microsoft Corporation. Advanced Power Management
+ *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
+ *
+ * [This document is available from Intel at:
+ *    http://www.intel.com/IAL/powermgm
+ *  or Microsoft at
+ *    http://www.microsoft.com/windows/thirdparty/hardware/pcfuture.htm
+ * ]
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/poll.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/timer.h>
+#include <linux/fcntl.h>
+#include <linux/malloc.h>
+#include <linux/linkage.h>
+#ifdef CONFIG_PROC_FS
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+#endif
+#include <linux/miscdevice.h>
+#include <linux/apm_bios.h>
+#include <linux/init.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/desc.h>
+
+EXPORT_SYMBOL(apm_register_callback);
+EXPORT_SYMBOL(apm_unregister_callback);
+
+extern unsigned long get_cmos_time(void);
+
+/*
+ * The apm_bios device is one of the misc char devices.
+ * This is its minor number.
+ */
+#define	APM_MINOR_DEV	134
+
+/* Configurable options:
+ *
+ * CONFIG_APM_IGNORE_USER_SUSPEND: define to ignore USER SUSPEND requests.
+ * This is necessary on the NEC Versa M series, which generates these when
+ * resuming from SYSTEM SUSPEND.  However, enabling this on other laptops
+ * will cause the laptop to generate a CRITICAL SUSPEND when an appropriate
+ * USER SUSPEND is ignored -- this may prevent the APM driver from updating
+ * the system time on a RESUME.
+ *
+ * CONFIG_APM_DO_ENABLE: enable APM features at boot time.  From page 36 of
+ * the specification: "When disabled, the APM BIOS does not automatically
+ * power manage devices, enter the Standby State, enter the Suspend State,
+ * or take power saving steps in response to CPU Idle calls."  This driver
+ * will make CPU Idle calls when Linux is idle (unless this feature is
+ * turned off -- see below).  This should always save battery power, but
+ * more complicated APM features will be dependent on your BIOS
+ * implementation.  You may need to turn this option off if your computer
+ * hangs at boot time when using APM support, or if it beeps continuously
+ * instead of suspending.  Turn this off if you have a NEC UltraLite Versa
+ * 33/C or a Toshiba T400CDT.  This is off by default since most machines
+ * do fine without this feature.
+ *
+ * CONFIG_APM_CPU_IDLE: enable calls to APM CPU Idle/CPU Busy inside the
+ * idle loop.  On some machines, this can activate improved power savings,
+ * such as a slowed CPU clock rate, when the machine is idle.  These idle
+ * call is made after the idle loop has run for some length of time (e.g.,
+ * 333 mS).  On some machines, this will cause a hang at boot time or
+ * whenever the CPU becomes idle.
+ *
+ * CONFIG_APM_DISPLAY_BLANK: enable console blanking using the APM.  Some
+ * laptops can use this to turn of the LCD backlight when the VC screen
+ * blanker blanks the screen.  Note that this is only used by the VC screen
+ * blanker, and probably won't turn off the backlight when using X11.  Some
+ * problems have been reported when using this option with gpm (if you'd
+ * like to debug this, please do so).
+ *
+ * CONFIG_APM_IGNORE_MULTIPLE_SUSPEND: The IBM TP560 bios seems to insist
+ * on returning multiple suspend/standby events whenever one occurs.  We
+ * really only need one at a time, so just ignore any beyond the first.
+ * This is probably safe on most laptops.
+ *
+ * If you are debugging the APM support for your laptop, note that code for
+ * all of these options is contained in this file, so you can #define or
+ * #undef these on the next line to avoid recompiling the whole kernel.
+ *
+ */
+
+/* KNOWN PROBLEM MACHINES:
+ *
+ * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
+ *                         [Confirmed by TI representative]
+ * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
+ *                    [Confirmed by BIOS disassembly]
+ *                    [This may work now ...]
+ * P: Toshiba 1950S: battery life information only gets updated after resume
+ * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
+ * 	broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
+ *
+ * Legend: U = unusable with APM patches
+ *         P = partially usable with APM patches
+ */
+
+/*
+ * Define to have debug messages.
+ */
+#undef APM_DEBUG
+
+/*
+ * Define to always call the APM BIOS busy routine even if the clock was
+ * not slowed by the idle routine.
+ */
+#define ALWAYS_CALL_BUSY
+
+/*
+ * Define to disable interrupts in APM BIOS calls (the CPU Idle BIOS call
+ * should turn interrupts on before it does a 'hlt').
+ * This reportedly needs undefining for the ThinkPad 600.
+ */
+#define APM_NOINTS
+
+/*
+ * Define to make the APM BIOS calls zero all data segment registers (so
+ * that an incorrect BIOS implementation will cause a kernel panic if it
+ * tries to write to arbitrary memory).
+ */
+#define APM_ZERO_SEGS
+
+/*
+ * Define to make all set_limit calls use 64k limits.  The APM 1.1 BIOS is
+ * supposed to provide limit information that it recognizes.  Many machines
+ * do this correctly, but many others do not restrict themselves to their
+ * claimed limit.  When this happens, they will cause a segmentation
+ * violation in the kernel at boot time.  Most BIOS's, however, will
+ * respect a 64k limit, so we use that.  If you want to be pedantic and
+ * hold your BIOS to its claims, then undefine this.
+ */
+#define APM_RELAX_SEGMENTS
+
+/*
+ * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
+ * This patched by Chad Miller <cmiller@surfsouth.com>, orig code by David 
+ * Chen <chen@ctpa04.mit.edu>
+ */
+#undef INIT_TIMER_AFTER_SUSPEND
+
+#ifdef INIT_TIMER_AFTER_SUSPEND
+#include <linux/timex.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#endif
+
+/*
+ * Need to poll the APM BIOS every second
+ */
+#define APM_CHECK_TIMEOUT	(HZ)
+
+/*
+ * Save a segment register away
+ */
+#define savesegment(seg, where) \
+		__asm__ __volatile__("movl %%" #seg ",%0" : "=m" (where))
+
+/*
+ * Forward declarations
+ */
+static void	suspend(void);
+static void	standby(void);
+static void	set_time(void);
+
+static void	check_events(void);
+static void	do_apm_timer(unsigned long);
+
+static int	do_open(struct inode *, struct file *);
+static int	do_release(struct inode *, struct file *);
+static ssize_t	do_read(struct file *, char *, size_t , loff_t *);
+static unsigned int do_poll(struct file *, poll_table *);
+static int	do_ioctl(struct inode *, struct file *, u_int, u_long);
+
+#ifdef CONFIG_PROC_FS
+static int	apm_get_info(char *, char **, off_t, int, int);
+#endif
+
+extern int	apm_register_callback(int (*)(apm_event_t));
+extern void	apm_unregister_callback(int (*)(apm_event_t));
+
+/*
+ * Local variables
+ */
+static asmlinkage struct {
+	unsigned long	offset;
+	unsigned short	segment;
+}				apm_bios_entry;
+static int			apm_enabled = 0;
+#ifdef CONFIG_APM_CPU_IDLE
+static int			clock_slowed = 0;
+#endif
+static int			suspends_pending = 0;
+static int			standbys_pending = 0;
+#ifdef CONFIG_APM_IGNORE_MULTIPLE_SUSPEND
+static int			waiting_for_resume = 0;
+#endif
+
+static long			clock_cmos_diff;
+static int			got_clock_diff = 0;
+static int			debug = 0;
+static int			apm_disabled = 0;
+
+static struct wait_queue *	process_list = NULL;
+static struct apm_bios_struct *	user_list = NULL;
+
+static struct timer_list	apm_timer;
+
+static char			driver_version[] = "1.7";	/* no spaces */
+
+#ifdef APM_DEBUG
+static char *	apm_event_name[] = {
+	"system standby",
+	"system suspend",
+	"normal resume",
+	"critical resume",
+	"low battery",
+	"power status change",
+	"update time",
+	"critical suspend",
+	"user standby",
+	"user suspend",
+	"system standby resume",
+	"capabilities change"
+};
+#define NR_APM_EVENT_NAME	\
+		(sizeof(apm_event_name) / sizeof(apm_event_name[0]))
+#endif
+
+static struct file_operations apm_bios_fops = {
+	NULL,		/* lseek */
+	do_read,
+	NULL,		/* write */
+	NULL,		/* readdir */
+	do_poll,
+	do_ioctl,
+	NULL,		/* mmap */
+	do_open,
+	NULL,		/* flush */
+	do_release,
+	NULL,		/* fsync */
+	NULL		/* fasync */
+};
+
+static struct miscdevice apm_device = {
+	APM_MINOR_DEV,
+	"apm",
+	&apm_bios_fops
+};
+
+typedef struct callback_list_t {
+	int (*				callback)(apm_event_t);
+	struct callback_list_t *	next;
+} callback_list_t;
+
+static callback_list_t *	callback_list = NULL;
+
+typedef struct lookup_t {
+	int	key;
+	char *	msg;
+} lookup_t;
+
+static const lookup_t error_table[] = {
+/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
+	{ APM_DISABLED,		"Power management disabled" },
+	{ APM_CONNECTED,	"Real mode interface already connected" },
+	{ APM_NOT_CONNECTED,	"Interface not connected" },
+	{ APM_16_CONNECTED,	"16 bit interface already connected" },
+/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
+	{ APM_32_CONNECTED,	"32 bit interface already connected" },
+	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
+	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
+	{ APM_BAD_PARAM,	"Parameter out of range" },
+	{ APM_NOT_ENGAGED,	"Interface not engaged" },
+	{ APM_BAD_FUNCTION,     "Function not supported" },
+	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
+	{ APM_BAD_STATE,	"Unable to enter requested state" },
+/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
+	{ APM_NOT_PRESENT,	"No APM present" }
+};
+#define ERROR_COUNT	(sizeof(error_table)/sizeof(lookup_t))
+
+/*
+ * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS
+ * and APM_NOINTS, we are being really paranoid here!  Not only are
+ * interrupts disabled, but all the segment registers (except SS) are
+ * saved and zeroed this means that if the BIOS tries to reference any
+ * data without explicitly loading the segment registers, the kernel will
+ * fault immediately rather than have some unforeseen circumstances for
+ * the rest of the kernel.  And it will be very obvious!  :-) Doing this
+ * depends on CS referring to the same physical memory as DS so that DS
+ * can be zeroed before the call. Unfortunately, we can't do anything
+ * about the stack segment/pointer.  Also, we tell the compiler that
+ * everything could change.
+ *
+ * Also, we KNOW that for the non error case of apm_bios_call, there
+ * is no useful data returned in the low order 8 bits of eax.
+ */
+#ifdef APM_NOINTS
+#	define APM_DO_CLI	__cli()
+#else
+#	define APM_DO_CLI
+#endif
+#ifdef APM_ZERO_SEGS
+#	define APM_DO_SAVE_SEGS \
+		savesegment(fs, saved_fs); \
+		savesegment(gs, saved_gs)
+#	define APM_DO_ZERO_SEGS \
+		"pushl %%ds\n\t" \
+		"pushl %%es\n\t" \
+		"xorl %%edx, %%edx\n\t" \
+		"mov %%dx, %%ds\n\t" \
+		"mov %%dx, %%es\n\t" \
+		"mov %%dx, %%fs\n\t" \
+		"mov %%dx, %%gs\n\t"
+#	define APM_DO_POP_SEGS \
+		"popl %%es\n\t" \
+		"popl %%ds\n\t"
+#	define APM_DO_RESTORE_SEGS \
+		loadsegment(fs, saved_fs); \
+		loadsegment(gs, saved_gs)
+#else
+#	define APM_DO_SAVE_SEGS
+#	define APM_DO_ZERO_SEGS
+#	define APM_DO_POP_SEGS
+#	define APM_DO_RESTORE_SEGS
+#endif
+
+static u8 apm_bios_call(u32 eax_in, u32 ebx_in, u32 ecx_in,
+	u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
+{
+	unsigned int	saved_fs;
+	unsigned int	saved_gs;
+	unsigned long	flags;
+
+	__save_flags(flags);
+	APM_DO_CLI;
+	APM_DO_SAVE_SEGS;
+	__asm__ __volatile__(APM_DO_ZERO_SEGS
+		"pushl %%edi\n\t"
+		"pushl %%ebp\n\t"
+		"lcall %%cs:" SYMBOL_NAME_STR(apm_bios_entry) "\n\t"
+		"setc %%al\n\t"
+		"popl %%ebp\n\t"
+		"popl %%edi\n\t"
+		APM_DO_POP_SEGS
+		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
+		  "=S" (*esi)
+		: "a" (eax_in), "b" (ebx_in), "c" (ecx_in)
+		: "memory", "cc");
+	APM_DO_RESTORE_SEGS;
+	__restore_flags(flags);
+	return *eax & 0xff;
+}
+
+/*
+ * This version only returns one value (usually an error code)
+ */
+
+static u8 apm_bios_call_simple(u32 eax_in, u32 ebx_in, u32 ecx_in,
+	u32 *eax)
+{
+	u8		error;
+	unsigned int	saved_fs;
+	unsigned int	saved_gs;
+	unsigned long	flags;
+
+	__save_flags(flags);
+	APM_DO_CLI;
+	APM_DO_SAVE_SEGS;
+	{
+		int	cx, dx, si;
+
+		__asm__ __volatile__(APM_DO_ZERO_SEGS
+			"pushl %%edi\n\t"
+			"pushl %%ebp\n\t"
+			"lcall %%cs:" SYMBOL_NAME_STR(apm_bios_entry) "\n\t"
+			"setc %%bl\n\t"
+			"popl %%ebp\n\t"
+			"popl %%edi\n\t"
+			APM_DO_POP_SEGS
+			: "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
+			  "=S" (si)
+			: "a" (eax_in), "b" (ebx_in), "c" (ecx_in)
+			: "memory", "cc");
+	}
+	APM_DO_RESTORE_SEGS;
+	__restore_flags(flags);
+	return error;
+}
+
+static int apm_driver_version(u_short *val)
+{
+	u32	eax;
+
+	if (apm_bios_call_simple(0x530e, 0, *val, &eax))
+		return (eax >> 8) & 0xff;
+	*val = eax;
+	return APM_SUCCESS;
+}
+
+static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
+{
+	u32	eax;
+	u32	ebx;
+	u32	ecx;
+	u32	dummy;
+
+	if (apm_bios_call(0x530b, 0, 0, &eax, &ebx, &ecx, &dummy, &dummy))
+		return (eax >> 8) & 0xff;
+	*event = ebx;
+	if (apm_bios_info.version < 0x0102)
+		*info = ~0; /* indicate info not valid */
+	else
+		*info = ecx;
+	return APM_SUCCESS;
+}
+
+static int set_power_state(u_short what, u_short state)
+{
+	u32	eax;
+
+	if (apm_bios_call_simple(0x5307, what, state, &eax))
+		return (eax >> 8) & 0xff;
+	return APM_SUCCESS;
+}
+
+static int apm_set_power_state(u_short state)
+{
+	return set_power_state(0x0001, state);
+}
+
+void apm_power_off(void)
+{
+	if (apm_enabled)
+		(void) apm_set_power_state(APM_STATE_OFF);
+}
+
+#ifdef CONFIG_APM_DISPLAY_BLANK
+/* Called by apm_display_blank and apm_display_unblank when apm_enabled. */
+static int apm_set_display_power_state(u_short state)
+{
+	return set_power_state(0x0100, state);
+}
+#endif
+
+#ifdef CONFIG_APM_DO_ENABLE
+static int apm_enable_power_management(void)
+{
+	u32	eax;
+
+	if (apm_bios_call_simple(0x5308,
+			(apm_bios_info.version > 0x100) ? 0x0001 : 0xffff,
+			1, &eax))
+		return (eax >> 8) & 0xff;
+	apm_bios_info.flags &= ~APM_BIOS_DISABLED;
+	return APM_SUCCESS;
+}
+#endif
+
+static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
+{
+	u32	eax;
+	u32	ebx;
+	u32	ecx;
+	u32	edx;
+	u32	dummy;
+
+	if (apm_bios_call(0x530a, 1, 0, &eax, &ebx, &ecx, &edx, &dummy))
+		return (eax >> 8) & 0xff;
+	*status = ebx;
+	*bat = ecx;
+	*life = edx;
+	return APM_SUCCESS;
+}
+
+#if 0
+/* not used anywhere */
+static int apm_get_battery_status(u_short which, 
+				  u_short *bat, u_short *life, u_short *nbat)
+{
+	u_short status;
+	u32	eax;
+	u32	ebx;
+	u32	ecx;
+	u32	edx;
+	u32	esi;
+
+	if (apm_bios_info.version < 0x0102) {
+		/* pretend we only have one battery. */
+		if (which != 1)
+			return APM_BAD_DEVICE;
+		*nbat = 1;
+		return apm_get_power_status(&status, bat, life);
+	}
+
+	if (apm_bios_call(0x530a, (0x8000 | (which)), 0, &eax,
+			&ebx, &ecx, &edx, &esi))
+		return (eax >> 8) & 0xff;
+	*bat = ecx;
+	*life = edx;
+	*nbat = esi;
+	return APM_SUCCESS;
+}
+#endif
+
+static int apm_engage_power_management(u_short device)
+{
+	u32	eax;
+
+	if (apm_bios_call_simple(0x530f, device, 1, &eax))
+		return (eax >> 8) & 0xff;
+	return APM_SUCCESS;
+}
+
+static void apm_error(char *str, int err)
+{
+	int	i;
+
+	for (i = 0; i < ERROR_COUNT; i++)
+		if (error_table[i].key == err) break;
+	if (i < ERROR_COUNT)
+		printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
+	else
+		printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
+			str, err);
+}
+
+/* Called from console driver -- must make sure apm_enabled. */
+int apm_display_blank(void)
+{
+#ifdef CONFIG_APM_DISPLAY_BLANK
+	int	error;
+
+	if (!apm_enabled)
+		return 0;
+	error = apm_set_display_power_state(APM_STATE_STANDBY);
+	if (error == APM_SUCCESS)
+		return 1;
+	apm_error("set display standby", error);
+#endif
+	return 0;
+}
+
+/* Called from console driver -- must make sure apm_enabled. */
+int apm_display_unblank(void)
+{
+#ifdef CONFIG_APM_DISPLAY_BLANK
+	int error;
+
+	if (!apm_enabled)
+		return 0;
+	error = apm_set_display_power_state(APM_STATE_READY);
+	if (error == APM_SUCCESS)
+		return 1;
+	apm_error("set display ready", error);
+#endif
+	return 0;
+}
+
+int apm_register_callback(int (*callback)(apm_event_t))
+{
+	callback_list_t *	new;
+
+	new = kmalloc(sizeof(callback_list_t), GFP_KERNEL);
+	if (new == NULL)
+		return -ENOMEM;
+	new->callback = callback;
+	new->next = callback_list;
+	callback_list = new;
+	return 0;
+}
+
+void apm_unregister_callback(int (*callback)(apm_event_t))
+{
+	callback_list_t **	ptr;
+	callback_list_t *	old;
+
+	for (ptr = &callback_list; *ptr != NULL; ptr = &(*ptr)->next)
+		if ((*ptr)->callback == callback)
+			break;
+	old = *ptr;
+	*ptr = old->next;
+	kfree_s(old, sizeof(callback_list_t));
+}
+
+static int queue_empty(struct apm_bios_struct * as)
+{
+	return as->event_head == as->event_tail;
+}
+
+static apm_event_t get_queued_event(struct apm_bios_struct * as)
+{
+	as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
+	return as->events[as->event_tail];
+}
+
+static int queue_event(apm_event_t event, struct apm_bios_struct *sender)
+{
+	struct apm_bios_struct *	as;
+
+	if (user_list == NULL)
+		return 0;
+	for (as = user_list; as != NULL; as = as->next) {
+		if (as == sender)
+			continue;
+		as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
+		if (as->event_head == as->event_tail) {
+			static int notified;
+
+			if (notified == 0) {
+			    printk(KERN_ERR "apm: an event queue overflowed\n");
+			    notified = 1;
+			}
+			as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
+		}
+		as->events[as->event_head] = event;
+		if (!as->suser)
+			continue;
+		switch (event) {
+		case APM_SYS_SUSPEND:
+		case APM_USER_SUSPEND:
+			as->suspends_pending++;
+			suspends_pending++;
+			break;
+
+		case APM_SYS_STANDBY:
+		case APM_USER_STANDBY:
+			as->standbys_pending++;
+			standbys_pending++;
+			break;
+		}
+	}
+	wake_up_interruptible(&process_list);
+	return 1;
+}
+
+static void set_time(void)
+{
+	unsigned long	flags;
+
+	if (!got_clock_diff)	/* Don't know time zone, can't set clock */
+		return;
+
+	save_flags(flags);
+	cli();
+	CURRENT_TIME = get_cmos_time() + clock_cmos_diff;
+	restore_flags(flags);
+}
+
+static void suspend(void)
+{
+	unsigned long	flags;
+	int		err;
+
+				/* Estimate time zone so that set_time can
+                                   update the clock */
+	save_flags(flags);
+	clock_cmos_diff = -get_cmos_time();
+	cli();
+	clock_cmos_diff += CURRENT_TIME;
+	got_clock_diff = 1;
+	restore_flags(flags);
+
+	err = apm_set_power_state(APM_STATE_SUSPEND);
+	if (err)
+		apm_error("suspend", err);
+#ifdef INIT_TIMER_AFTER_SUSPEND
+	save_flags(flags);
+	cli();
+	/* set the clock to 100 Hz */
+	outb_p(0x34,0x43);		/* binary, mode 2, LSB/MSB, ch 0 */
+	udelay(10);
+	outb_p(LATCH & 0xff , 0x40);	/* LSB */
+	udelay(10);
+	outb(LATCH >> 8 , 0x40);	/* MSB */
+	udelay(10);
+	restore_flags(flags);
+#endif
+	set_time();
+}
+
+static void standby(void)
+{
+	int	err;
+
+	err = apm_set_power_state(APM_STATE_STANDBY);
+	if (err)
+		apm_error("standby", err);
+}
+
+static apm_event_t get_event(void)
+{
+	int		error;
+	apm_event_t	event;
+	apm_eventinfo_t	info;
+
+	static int notified = 0;
+
+	/* we don't use the eventinfo */
+	error = apm_get_event(&event, &info);
+	if (error == APM_SUCCESS)
+		return event;
+
+	if ((error != APM_NO_EVENTS) && (notified++ == 0))
+		apm_error("get_event", error);
+
+	return 0;
+}
+
+static void send_event(apm_event_t event, apm_event_t undo,
+		       struct apm_bios_struct *sender)
+{
+	callback_list_t *	call;
+	callback_list_t *	fix;
+
+	for (call = callback_list; call != NULL; call = call->next) {
+		if (call->callback(event) && undo) {
+			for (fix = callback_list; fix != call; fix = fix->next)
+				fix->callback(undo);
+			if (apm_bios_info.version > 0x100)
+				apm_set_power_state(APM_STATE_REJECT);
+			return;
+		}
+	}
+
+	queue_event(event, sender);
+}
+
+static void check_events(void)
+{
+	apm_event_t		event;
+#ifdef CONFIG_APM_IGNORE_SUSPEND_BOUNCE
+	static unsigned long	last_resume = 0;
+	static int		did_resume = 0;
+#endif
+
+	while ((event = get_event()) != 0) {
+#ifdef APM_DEBUG
+		if (event <= NR_APM_EVENT_NAME)
+			printk(KERN_DEBUG "apm: received %s notify\n",
+			       apm_event_name[event - 1]);
+		else
+			printk(KERN_DEBUG "apm: received unknown "
+			       "event 0x%02x\n", event);
+#endif
+		switch (event) {
+		case APM_SYS_STANDBY:
+		case APM_USER_STANDBY:
+#ifdef CONFIG_APM_IGNORE_MULTIPLE_SUSPEND
+			if (waiting_for_resume)
+				return;
+			waiting_for_resume = 1;
+#endif
+			send_event(event, APM_STANDBY_RESUME, NULL);
+			if (standbys_pending <= 0)
+				standby();
+			break;
+
+		case APM_USER_SUSPEND:
+#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
+			if (apm_bios_info.version > 0x100)
+				apm_set_power_state(APM_STATE_REJECT);
+			break;
+#endif
+		case APM_SYS_SUSPEND:
+#ifdef CONFIG_APM_IGNORE_SUSPEND_BOUNCE
+			if (did_resume && ((jiffies - last_resume) < HZ))
+				break;
+#endif
+#ifdef CONFIG_APM_IGNORE_MULTIPLE_SUSPEND
+			if (waiting_for_resume)
+				return;
+			waiting_for_resume = 1;
+#endif
+			send_event(event, APM_NORMAL_RESUME, NULL);
+			if (suspends_pending <= 0)
+				suspend();
+			break;
+
+		case APM_NORMAL_RESUME:
+		case APM_CRITICAL_RESUME:
+		case APM_STANDBY_RESUME:
+#ifdef CONFIG_APM_IGNORE_MULTIPLE_SUSPEND
+			waiting_for_resume = 0;
+#endif
+#ifdef CONFIG_APM_IGNORE_SUSPEND_BOUNCE
+			last_resume = jiffies;
+			did_resume = 1;
+#endif
+			set_time();
+			send_event(event, 0, NULL);
+			break;
+
+		case APM_LOW_BATTERY:
+		case APM_POWER_STATUS_CHANGE:
+		case APM_CAPABILITY_CHANGE:
+			send_event(event, 0, NULL);
+			break;
+
+		case APM_UPDATE_TIME:
+			set_time();
+			break;
+
+		case APM_CRITICAL_SUSPEND:
+			suspend();
+			break;
+		}
+	}
+}
+
+static void do_apm_timer(unsigned long unused)
+{
+	int	err;
+
+	static int	pending_count = 0;
+
+	if (((standbys_pending > 0) || (suspends_pending > 0))
+	    && (apm_bios_info.version > 0x100)
+	    && (pending_count-- <= 0)) {
+		pending_count = 4;
+
+		err = apm_set_power_state(APM_STATE_BUSY);
+		if (err)
+			apm_error("busy", err);
+	}
+
+	if (!(((standbys_pending > 0) || (suspends_pending > 0))
+	      && (apm_bios_info.version == 0x100)))
+		check_events();
+
+	init_timer(&apm_timer);
+	apm_timer.expires = APM_CHECK_TIMEOUT + jiffies;
+	add_timer(&apm_timer);
+}
+
+/* Called from sys_idle, must make sure apm_enabled. */
+int apm_do_idle(void)
+{
+#ifdef CONFIG_APM_CPU_IDLE
+	u32	dummy;
+
+	if (!apm_enabled)
+		return 0;
+
+	if (apm_bios_call_simple(0x5305, 0, 0, &dummy))
+		return 0;
+
+	clock_slowed = (apm_bios_info.flags & APM_IDLE_SLOWS_CLOCK) != 0;
+	return 1;
+#else
+	return 0;
+#endif
+}
+
+/* Called from sys_idle, must make sure apm_enabled. */
+void apm_do_busy(void)
+{
+#ifdef CONFIG_APM_CPU_IDLE
+	u32	dummy;
+
+	if (apm_enabled
+#ifndef ALWAYS_CALL_BUSY
+		&& clock_slowed
+#endif
+	) {
+		(void) apm_bios_call_simple(0x5306, 0, 0, &dummy);
+		clock_slowed = 0;
+	}
+#endif
+}
+
+static int check_apm_bios_struct(struct apm_bios_struct *as, const char *func)
+{
+	if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
+		printk(KERN_ERR "apm: %s passed bad filp", func);
+		return 1;
+	}
+	return 0;
+}
+
+static ssize_t do_read(struct file *fp, char *buf, size_t count, loff_t *ppos)
+{
+	struct apm_bios_struct *	as;
+	int			i;
+	apm_event_t		event;
+	struct wait_queue	wait = { current,	NULL };
+
+	as = fp->private_data;
+	if (check_apm_bios_struct(as, "read"))
+		return -EIO;
+	if (count < sizeof(apm_event_t))
+		return -EINVAL;
+	if (queue_empty(as)) {
+		if (fp->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+		add_wait_queue(&process_list, &wait);
+repeat:
+		current->state = TASK_INTERRUPTIBLE;
+		if (queue_empty(as) && !signal_pending(current)) {
+			schedule();
+			goto repeat;
+		}
+		current->state = TASK_RUNNING;
+		remove_wait_queue(&process_list, &wait);
+	}
+	i = count;
+	while ((i >= sizeof(event)) && !queue_empty(as)) {
+		event = get_queued_event(as);
+		copy_to_user(buf, &event, sizeof(event));
+		switch (event) {
+		case APM_SYS_SUSPEND:
+		case APM_USER_SUSPEND:
+			as->suspends_read++;
+			break;
+
+		case APM_SYS_STANDBY:
+		case APM_USER_STANDBY:
+			as->standbys_read++;
+			break;
+		}
+		buf += sizeof(event);
+		i -= sizeof(event);
+	}
+	if (i < count)
+		return count - i;
+	if (signal_pending(current))
+		return -ERESTARTSYS;
+	return 0;
+}
+
+static unsigned int do_poll(struct file *fp, poll_table * wait)
+{
+	struct apm_bios_struct * as;
+
+	as = fp->private_data;
+	if (check_apm_bios_struct(as, "select"))
+		return 0;
+	poll_wait(fp, &process_list, wait);
+	if (!queue_empty(as))
+		return POLLIN | POLLRDNORM;
+	return 0;
+}
+
+static int do_ioctl(struct inode * inode, struct file *filp,
+		    u_int cmd, u_long arg)
+{
+	struct apm_bios_struct *	as;
+
+	as = filp->private_data;
+	if (check_apm_bios_struct(as, "ioctl"))
+		return -EIO;
+	if (!as->suser)
+		return -EPERM;
+	switch (cmd) {
+	case APM_IOC_STANDBY:
+		if (as->standbys_read > 0) {
+			as->standbys_read--;
+			as->standbys_pending--;
+			standbys_pending--;
+		}
+		else
+			send_event(APM_USER_STANDBY, APM_STANDBY_RESUME, as);
+		if (standbys_pending <= 0)
+			standby();
+		break;
+	case APM_IOC_SUSPEND:
+		if (as->suspends_read > 0) {
+			as->suspends_read--;
+			as->suspends_pending--;
+			suspends_pending--;
+		}
+		else
+			send_event(APM_USER_SUSPEND, APM_NORMAL_RESUME, as);
+		if (suspends_pending <= 0)
+			suspend();
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int do_release(struct inode * inode, struct file * filp)
+{
+	struct apm_bios_struct *	as;
+
+	as = filp->private_data;
+	filp->private_data = NULL;
+	if (check_apm_bios_struct(as, "release"))
+		return 0;
+	if (as->standbys_pending > 0) {
+		standbys_pending -= as->standbys_pending;
+		if (standbys_pending <= 0)
+			standby();
+	}
+	if (as->suspends_pending > 0) {
+		suspends_pending -= as->suspends_pending;
+		if (suspends_pending <= 0)
+			suspend();
+	}
+	if (user_list == as)
+		user_list = as->next;
+	else {
+		struct apm_bios_struct *	as1;
+
+		for (as1 = user_list;
+		     (as1 != NULL) && (as1->next != as);
+		     as1 = as1->next)
+			;
+		if (as1 == NULL)
+			printk(KERN_ERR "apm: filp not in user list");
+		else
+			as1->next = as->next;
+	}
+	kfree_s(as, sizeof(*as));
+	return 0;
+}
+
+static int do_open(struct inode * inode, struct file * filp)
+{
+	struct apm_bios_struct *	as;
+
+	as = (struct apm_bios_struct *)kmalloc(sizeof(*as), GFP_KERNEL);
+	if (as == NULL) {
+		printk(KERN_ERR "apm: cannot allocate struct of size %d bytes",
+		       sizeof(*as));
+		return -ENOMEM;
+	}
+	as->magic = APM_BIOS_MAGIC;
+	as->event_tail = as->event_head = 0;
+	as->suspends_pending = as->standbys_pending = 0;
+	as->suspends_read = as->standbys_read = 0;
+	/*
+	 * XXX - this is a tiny bit broken, when we consider BSD
+         * process accounting. If the device is opened by root, we
+	 * instantly flag that we used superuser privs. Who knows,
+	 * we might close the device immediately without doing a
+	 * privileged operation -- cevans
+	 */
+	as->suser = capable(CAP_SYS_ADMIN);
+	as->next = user_list;
+	user_list = as;
+	filp->private_data = as;
+	return 0;
+}
+
+#ifdef CONFIG_PROC_FS
+int apm_get_info(char *buf, char **start, off_t fpos, int length, int dummy)
+{
+	char *		p;
+	unsigned short	bx;
+	unsigned short	cx;
+	unsigned short	dx;
+	unsigned short	error;
+	unsigned short  ac_line_status = 0xff;
+	unsigned short  battery_status = 0xff;
+	unsigned short  battery_flag   = 0xff;
+	int		percentage     = -1;
+	int             time_units     = -1;
+	char            *units         = "?";
+
+	if (!apm_enabled)
+		return 0;
+	p = buf;
+
+	if (!(error = apm_get_power_status(&bx, &cx, &dx))) {
+		ac_line_status = (bx >> 8) & 0xff;
+		battery_status = bx & 0xff;
+		if ((cx & 0xff) != 0xff)
+			percentage = cx & 0xff;
+
+		if (apm_bios_info.version > 0x100) {
+			battery_flag = (cx >> 8) & 0xff;
+			if (dx != 0xffff) {
+				if ((dx & 0x8000) == 0x8000) {
+					units = "min";
+					time_units = dx & 0x7ffe;
+				} else {
+					units = "sec";
+					time_units = dx & 0x7fff;
+				}
+			}
+		}
+	}
+	/* Arguments, with symbols from linux/apm_bios.h.  Information is
+	   from the Get Power Status (0x0a) call unless otherwise noted.
+
+	   0) Linux driver version (this will change if format changes)
+	   1) APM BIOS Version.  Usually 1.0 or 1.1.
+	   2) APM flags from APM Installation Check (0x00):
+	      bit 0: APM_16_BIT_SUPPORT
+	      bit 1: APM_32_BIT_SUPPORT
+	      bit 2: APM_IDLE_SLOWS_CLOCK
+	      bit 3: APM_BIOS_DISABLED
+	      bit 4: APM_BIOS_DISENGAGED
+	   3) AC line status
+	      0x00: Off-line
+	      0x01: On-line
+	      0x02: On backup power (APM BIOS 1.1 only)
+	      0xff: Unknown
+	   4) Battery status
+	      0x00: High
+	      0x01: Low
+	      0x02: Critical
+	      0x03: Charging
+	      0xff: Unknown
+	   5) Battery flag
+	      bit 0: High
+	      bit 1: Low
+	      bit 2: Critical
+	      bit 3: Charging
+	      bit 7: No system battery
+	      0xff: Unknown
+	   6) Remaining battery life (percentage of charge):
+	      0-100: valid
+	      -1: Unknown
+	   7) Remaining battery life (time units):
+	      Number of remaining minutes or seconds
+	      -1: Unknown
+	   8) min = minutes; sec = seconds */
+
+	p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
+		     driver_version,
+		     (apm_bios_info.version >> 8) & 0xff,
+		     apm_bios_info.version & 0xff,
+		     apm_bios_info.flags,
+		     ac_line_status,
+		     battery_status,
+		     battery_flag,
+		     percentage,
+		     time_units,
+		     units);
+
+	return p - buf;
+}
+#endif
+
+void __init apm_setup(char *str, int *dummy)
+{
+	int	invert;
+
+	while ((str != NULL) && (*str != '\0')) {
+		if (strncmp(str, "off", 3) == 0)
+			apm_disabled = 1;
+		if (strncmp(str, "on", 2) == 0)
+			apm_disabled = 0;
+		invert = (strncmp(str, "no-", 3) == 0);
+		if (invert)
+			str += 3;
+		if (strncmp(str, "debug", 5) == 0)
+			debug = !invert;
+		str = strchr(str, ',');
+		if (str != NULL)
+			str += strspn(str, ", \t");
+	}
+}
+
+void __init apm_bios_init(void)
+{
+	unsigned short	bx;
+	unsigned short	cx;
+	unsigned short	dx;
+	unsigned short	error;
+	char *		power_stat;
+	char *		bat_stat;
+	static struct proc_dir_entry *ent;
+
+	if (apm_bios_info.version == 0) {
+		printk(KERN_INFO "apm: BIOS not found.\n");
+		return;
+	}
+	printk(KERN_INFO
+		"apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
+		((apm_bios_info.version >> 8) & 0xff),
+		(apm_bios_info.version & 0xff),
+		apm_bios_info.flags,
+		driver_version);
+	if ((apm_bios_info.flags & APM_32_BIT_SUPPORT) == 0) {
+		printk(KERN_INFO "apm: no 32 bit BIOS support\n");
+		return;
+	}
+
+	/*
+	 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
+	 * but is reportedly a 1.0 BIOS.
+	 */
+	if (apm_bios_info.version == 0x001)
+		apm_bios_info.version = 0x100;
+
+	/* BIOS < 1.2 doesn't set cseg_16_len */
+	if (apm_bios_info.version < 0x102)
+		apm_bios_info.cseg_16_len = 0xFFFF; /* 64k */
+
+	if (debug) {
+		printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
+			apm_bios_info.cseg, apm_bios_info.offset,
+			apm_bios_info.cseg_16, apm_bios_info.dseg);
+		if (apm_bios_info.version > 0x100)
+			printk(" cseg len %x, cseg16 len %x, dseg len %x",
+				apm_bios_info.cseg_len,
+				apm_bios_info.cseg_16_len,
+				apm_bios_info.dseg_len);
+		printk("\n");
+	}
+
+	if (apm_disabled) {
+		printk(KERN_NOTICE "apm: disabled on user request.\n");
+		return;
+	}
+#ifdef __SMP__
+	if (smp_num_cpus > 1) {
+		printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
+		return;
+	}
+#endif
+
+	/*
+	 * Set up a segment that references the real mode segment 0x40
+	 * that extends up to the end of page zero (that we have reserved).
+	 * This is for buggy BIOS's that refer to (real mode) segment 0x40
+	 * even though they are called in protected mode.
+	 */
+	set_base(gdt[APM_40 >> 3],
+		 __va((unsigned long)0x40 << 4));
+	set_limit(gdt[APM_40 >> 3], 4096 - (0x40 << 4));
+
+	apm_bios_entry.offset = apm_bios_info.offset;
+	apm_bios_entry.segment = APM_CS;
+	set_base(gdt[APM_CS >> 3],
+		 __va((unsigned long)apm_bios_info.cseg << 4));
+	set_base(gdt[APM_CS_16 >> 3],
+		 __va((unsigned long)apm_bios_info.cseg_16 << 4));
+	set_base(gdt[APM_DS >> 3],
+		 __va((unsigned long)apm_bios_info.dseg << 4));
+	if (apm_bios_info.version == 0x100) {
+		set_limit(gdt[APM_CS >> 3], 64 * 1024);
+		set_limit(gdt[APM_CS_16 >> 3], 64 * 1024);
+		set_limit(gdt[APM_DS >> 3], 64 * 1024);
+	} else {
+#ifdef APM_RELAX_SEGMENTS
+		/* For ASUS motherboard, Award BIOS rev 110 (and others?) */
+		set_limit(gdt[APM_CS >> 3], 64 * 1024);
+		/* For some unknown machine. */
+		set_limit(gdt[APM_CS_16 >> 3], 64 * 1024);
+		/* For the DEC Hinote Ultra CT475 (and others?) */
+		set_limit(gdt[APM_DS >> 3], 64 * 1024);
+#else
+		set_limit(gdt[APM_CS >> 3], apm_bios_info.cseg_len);
+		set_limit(gdt[APM_CS_16 >> 3], apm_bios_info.cseg_16_len);
+		set_limit(gdt[APM_DS >> 3], apm_bios_info.dseg_len);
+#endif
+		/*
+		 * We only support BIOSs up to version 1.2
+		 */
+		if (apm_bios_info.version > 0x0102)
+			apm_bios_info.version = 0x0102;
+		if (apm_driver_version(&apm_bios_info.version) != APM_SUCCESS) {
+			/* Fall back to an APM 1.0 connection. */
+			apm_bios_info.version = 0x100;
+		}
+	}
+	if (debug) {
+		printk(KERN_INFO "apm: onnection version %d.%d\n",
+			(apm_bios_info.version >> 8) & 0xff,
+			apm_bios_info.version & 0xff );
+
+		error = apm_get_power_status(&bx, &cx, &dx);
+		if (error)
+			printk(KERN_INFO "apm: power status not available\n");
+		else {
+			switch ((bx >> 8) & 0xff) {
+			case 0: power_stat = "off line"; break;
+			case 1: power_stat = "on line"; break;
+			case 2: power_stat = "on backup power"; break;
+			default: power_stat = "unknown"; break;
+			}
+			switch (bx & 0xff) {
+			case 0: bat_stat = "high"; break;
+			case 1: bat_stat = "low"; break;
+			case 2: bat_stat = "critical"; break;
+			case 3: bat_stat = "charging"; break;
+			default: bat_stat = "unknown"; break;
+			}
+			printk(KERN_INFO "apm: AC %s, battery status %s, battery life ",
+			       power_stat, bat_stat);
+			if ((cx & 0xff) == 0xff)
+				printk("unknown\n");
+			else
+				printk("%d%%\n", cx & 0xff);
+			if (apm_bios_info.version > 0x100) {
+				printk("apm: battery flag 0x%02x, battery life ",
+				       (cx >> 8) & 0xff);
+				if (dx == 0xffff)
+					printk("unknown\n");
+				else {
+					if ((dx & 0x8000))
+						printk("%d minutes\n", dx & 0x7ffe );
+					else
+						printk("%d seconds\n", dx & 0x7fff );
+				}
+			}
+		}
+	}
+
+#ifdef CONFIG_APM_DO_ENABLE
+	if (apm_bios_info.flags & APM_BIOS_DISABLED) {
+		/*
+		 * This call causes my NEC UltraLite Versa 33/C to hang if it
+		 * is booted with PM disabled but not in the docking station.
+		 * Unfortunate ...
+		 */
+		error = apm_enable_power_management();
+		if (error) {
+			apm_error("enable power management", error);
+			return;
+		}
+	}
+#endif
+	if (((apm_bios_info.flags & APM_BIOS_DISABLED) == 0)
+	    && (apm_bios_info.version > 0x0100)) {
+		if (apm_engage_power_management(0x0001) == APM_SUCCESS)
+			apm_bios_info.flags &= ~APM_BIOS_DISENGAGED;
+	}
+
+	init_timer(&apm_timer);
+	apm_timer.function = do_apm_timer;
+	apm_timer.expires = APM_CHECK_TIMEOUT + jiffies;
+	add_timer(&apm_timer);
+
+#ifdef CONFIG_PROC_FS
+	ent = create_proc_entry("apm", 0, 0);
+	ent->get_info = apm_get_info;
+#endif
+
+	misc_register(&apm_device);
+
+	apm_enabled = 1;
+}