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v4.17
   1/* -*- linux-c -*-
   2 * APM BIOS driver for Linux
   3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
   4 *
   5 * Initial development of this driver was funded by NEC Australia P/L
   6 *	and NEC Corporation
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under the terms of the GNU General Public License as published by the
  10 * Free Software Foundation; either version 2, or (at your option) any
  11 * later version.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * October 1995, Rik Faith (faith@cs.unc.edu):
  19 *    Minor enhancements and updates (to the patch set) for 1.3.x
  20 *    Documentation
  21 * January 1996, Rik Faith (faith@cs.unc.edu):
  22 *    Make /proc/apm easy to format (bump driver version)
  23 * March 1996, Rik Faith (faith@cs.unc.edu):
  24 *    Prohibit APM BIOS calls unless apm_enabled.
  25 *    (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
  26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
  27 *    Version 1.0 and 1.1
  28 * May 1996, Version 1.2
  29 * Feb 1998, Version 1.3
  30 * Feb 1998, Version 1.4
  31 * Aug 1998, Version 1.5
  32 * Sep 1998, Version 1.6
  33 * Nov 1998, Version 1.7
  34 * Jan 1999, Version 1.8
  35 * Jan 1999, Version 1.9
  36 * Oct 1999, Version 1.10
  37 * Nov 1999, Version 1.11
  38 * Jan 2000, Version 1.12
  39 * Feb 2000, Version 1.13
  40 * Nov 2000, Version 1.14
  41 * Oct 2001, Version 1.15
  42 * Jan 2002, Version 1.16
  43 * Oct 2002, Version 1.16ac
  44 *
  45 * History:
  46 *    0.6b: first version in official kernel, Linux 1.3.46
  47 *    0.7: changed /proc/apm format, Linux 1.3.58
  48 *    0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
  49 *    0.9: only call bios if bios is present, Linux 1.3.72
  50 *    1.0: use fixed device number, consolidate /proc/apm into this file,
  51 *         Linux 1.3.85
  52 *    1.1: support user-space standby and suspend, power off after system
  53 *         halted, Linux 1.3.98
  54 *    1.2: When resetting RTC after resume, take care so that the time
  55 *         is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
  56 *         <jtoth@princeton.edu>); improve interaction between
  57 *         screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
  58 *    1.2a:Simple change to stop mysterious bug reports with SMP also added
  59 *	   levels to the printk calls. APM is not defined for SMP machines.
  60 *         The new replacement for it is, but Linux doesn't yet support this.
  61 *         Alan Cox Linux 2.1.55
  62 *    1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
  63 *    1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
  64 *         Dean Gaudet <dgaudet@arctic.org>.
  65 *         C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
  66 *    1.5: Fix segment register reloading (in case of bad segments saved
  67 *         across BIOS call).
  68 *         Stephen Rothwell
  69 *    1.6: Cope with compiler/assembler differences.
  70 *         Only try to turn off the first display device.
  71 *         Fix OOPS at power off with no APM BIOS by Jan Echternach
  72 *                   <echter@informatik.uni-rostock.de>
  73 *         Stephen Rothwell
  74 *    1.7: Modify driver's cached copy of the disabled/disengaged flags
  75 *         to reflect current state of APM BIOS.
  76 *         Chris Rankin <rankinc@bellsouth.net>
  77 *         Reset interrupt 0 timer to 100Hz after suspend
  78 *         Chad Miller <cmiller@surfsouth.com>
  79 *         Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
  80 *         Richard Gooch <rgooch@atnf.csiro.au>
  81 *         Allow boot time disabling of APM
  82 *         Make boot messages far less verbose by default
  83 *         Make asm safer
  84 *         Stephen Rothwell
  85 *    1.8: Add CONFIG_APM_RTC_IS_GMT
  86 *         Richard Gooch <rgooch@atnf.csiro.au>
  87 *         change APM_NOINTS to CONFIG_APM_ALLOW_INTS
  88 *         remove dependency on CONFIG_PROC_FS
  89 *         Stephen Rothwell
  90 *    1.9: Fix small typo.  <laslo@wodip.opole.pl>
  91 *         Try to cope with BIOS's that need to have all display
  92 *         devices blanked and not just the first one.
  93 *         Ross Paterson <ross@soi.city.ac.uk>
  94 *         Fix segment limit setting it has always been wrong as
  95 *         the segments needed to have byte granularity.
  96 *         Mark a few things __init.
  97 *         Add hack to allow power off of SMP systems by popular request.
  98 *         Use CONFIG_SMP instead of __SMP__
  99 *         Ignore BOUNCES for three seconds.
 100 *         Stephen Rothwell
 101 *   1.10: Fix for Thinkpad return code.
 102 *         Merge 2.2 and 2.3 drivers.
 103 *         Remove APM dependencies in arch/i386/kernel/process.c
 104 *         Remove APM dependencies in drivers/char/sysrq.c
 105 *         Reset time across standby.
 106 *         Allow more inititialisation on SMP.
 107 *         Remove CONFIG_APM_POWER_OFF and make it boot time
 108 *         configurable (default on).
 109 *         Make debug only a boot time parameter (remove APM_DEBUG).
 110 *         Try to blank all devices on any error.
 111 *   1.11: Remove APM dependencies in drivers/char/console.c
 112 *         Check nr_running to detect if we are idle (from
 113 *         Borislav Deianov <borislav@lix.polytechnique.fr>)
 114 *         Fix for bioses that don't zero the top part of the
 115 *         entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
 116 *         (reported by Panos Katsaloulis <teras@writeme.com>).
 117 *         Real mode power off patch (Walter Hofmann
 118 *         <Walter.Hofmann@physik.stud.uni-erlangen.de>).
 119 *   1.12: Remove CONFIG_SMP as the compiler will optimize
 120 *         the code away anyway (smp_num_cpus == 1 in UP)
 121 *         noted by Artur Skawina <skawina@geocities.com>.
 122 *         Make power off under SMP work again.
 123 *         Fix thinko with initial engaging of BIOS.
 124 *         Make sure power off only happens on CPU 0
 125 *         (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
 126 *         Do error notification to user mode if BIOS calls fail.
 127 *         Move entrypoint offset fix to ...boot/setup.S
 128 *         where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
 129 *         Remove smp-power-off. SMP users must now specify
 130 *         "apm=power-off" on the kernel command line. Suggested
 131 *         by Jim Avera <jima@hal.com>, modified by Alan Cox
 132 *         <alan@lxorguk.ukuu.org.uk>.
 133 *         Register the /proc/apm entry even on SMP so that
 134 *         scripts that check for it before doing power off
 135 *         work (Jim Avera <jima@hal.com>).
 136 *   1.13: Changes for new pm_ interfaces (Andy Henroid
 137 *         <andy_henroid@yahoo.com>).
 138 *         Modularize the code.
 139 *         Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
 140 *         is now the way life works).
 141 *         Fix thinko in suspend() (wrong return).
 142 *         Notify drivers on critical suspend.
 143 *         Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz>
 144 *         modified by sfr).
 145 *         Disable interrupts while we are suspended (Andy Henroid
 146 *         <andy_henroid@yahoo.com> fixed by sfr).
 147 *         Make power off work on SMP again (Tony Hoyle
 148 *         <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
 149 *         Remove CONFIG_APM_SUSPEND_BOUNCE.  The bounce ignore
 150 *         interval is now configurable.
 151 *   1.14: Make connection version persist across module unload/load.
 152 *         Enable and engage power management earlier.
 153 *         Disengage power management on module unload.
 154 *         Changed to use the sysrq-register hack for registering the
 155 *         power off function called by magic sysrq based upon discussions
 156 *         in irc://irc.openprojects.net/#kernelnewbies
 157 *         (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
 158 *         Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
 159 *         (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
 160 *         Work around byte swap bug in one of the Vaio's BIOS's
 161 *         (Marc Boucher <marc@mbsi.ca>).
 162 *         Exposed the disable flag to dmi so that we can handle known
 163 *         broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>).
 164 *   1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
 165 *         calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
 166 *         If an APM idle fails log it and idle sensibly
 167 *   1.15: Don't queue events to clients who open the device O_WRONLY.
 168 *         Don't expect replies from clients who open the device O_RDONLY.
 169 *         (Idea from Thomas Hood)
 170 *         Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
 171 *   1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
 172 *         Notify listeners of standby or suspend events before notifying
 173 *         drivers. Return EBUSY to ioctl() if suspend is rejected.
 174 *         (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
 175 *         Ignore first resume after we generate our own resume event
 176 *         after a suspend (Thomas Hood)
 177 *         Daemonize now gets rid of our controlling terminal (sfr).
 178 *         CONFIG_APM_CPU_IDLE now just affects the default value of
 179 *         idle_threshold (sfr).
 180 *         Change name of kernel apm daemon (as it no longer idles) (sfr).
 181 *   1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
 182 *	   make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
 183 *	   TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
 184 *
 185 * APM 1.1 Reference:
 186 *
 187 *   Intel Corporation, Microsoft Corporation. Advanced Power Management
 188 *   (APM) BIOS Interface Specification, Revision 1.1, September 1993.
 189 *   Intel Order Number 241704-001.  Microsoft Part Number 781-110-X01.
 190 *
 191 * [This document is available free from Intel by calling 800.628.8686 (fax
 192 * 916.356.6100) or 800.548.4725; or from
 193 * http://www.microsoft.com/whdc/archive/amp_12.mspx  It is also
 194 * available from Microsoft by calling 206.882.8080.]
 195 *
 196 * APM 1.2 Reference:
 197 *   Intel Corporation, Microsoft Corporation. Advanced Power Management
 198 *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
 199 *
 200 * [This document is available from Microsoft at:
 201 *    http://www.microsoft.com/whdc/archive/amp_12.mspx]
 202 */
 203
 204#define pr_fmt(fmt) "apm: " fmt
 205
 206#include <linux/module.h>
 207
 208#include <linux/poll.h>
 209#include <linux/types.h>
 210#include <linux/stddef.h>
 211#include <linux/timer.h>
 212#include <linux/fcntl.h>
 213#include <linux/slab.h>
 214#include <linux/stat.h>
 215#include <linux/proc_fs.h>
 216#include <linux/seq_file.h>
 217#include <linux/miscdevice.h>
 218#include <linux/apm_bios.h>
 219#include <linux/init.h>
 220#include <linux/time.h>
 221#include <linux/sched/signal.h>
 222#include <linux/sched/cputime.h>
 223#include <linux/pm.h>
 224#include <linux/capability.h>
 225#include <linux/device.h>
 226#include <linux/kernel.h>
 227#include <linux/freezer.h>
 228#include <linux/smp.h>
 229#include <linux/dmi.h>
 230#include <linux/suspend.h>
 231#include <linux/kthread.h>
 232#include <linux/jiffies.h>
 233#include <linux/acpi.h>
 234#include <linux/syscore_ops.h>
 235#include <linux/i8253.h>
 236#include <linux/cpuidle.h>
 237
 238#include <linux/uaccess.h>
 
 239#include <asm/desc.h>
 240#include <asm/olpc.h>
 241#include <asm/paravirt.h>
 242#include <asm/reboot.h>
 243
 244#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
 245extern int (*console_blank_hook)(int);
 246#endif
 247
 248/*
 249 * The apm_bios device is one of the misc char devices.
 250 * This is its minor number.
 251 */
 252#define	APM_MINOR_DEV	134
 253
 254/*
 
 
 255 * Various options can be changed at boot time as follows:
 256 * (We allow underscores for compatibility with the modules code)
 257 *	apm=on/off			enable/disable APM
 258 *	    [no-]allow[-_]ints		allow interrupts during BIOS calls
 259 *	    [no-]broken[-_]psr		BIOS has a broken GetPowerStatus call
 260 *	    [no-]realmode[-_]power[-_]off	switch to real mode before
 261 *	    					powering off
 262 *	    [no-]debug			log some debugging messages
 263 *	    [no-]power[-_]off		power off on shutdown
 264 *	    [no-]smp			Use apm even on an SMP box
 265 *	    bounce[-_]interval=<n>	number of ticks to ignore suspend
 266 *	    				bounces
 267 *          idle[-_]threshold=<n>       System idle percentage above which to
 268 *                                      make APM BIOS idle calls. Set it to
 269 *                                      100 to disable.
 270 *          idle[-_]period=<n>          Period (in 1/100s of a second) over
 271 *                                      which the idle percentage is
 272 *                                      calculated.
 273 */
 274
 275/* KNOWN PROBLEM MACHINES:
 276 *
 277 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
 278 *                         [Confirmed by TI representative]
 279 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
 280 *                    [Confirmed by BIOS disassembly]
 281 *                    [This may work now ...]
 282 * P: Toshiba 1950S: battery life information only gets updated after resume
 283 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
 284 * 	broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
 285 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
 286 * 	Neale Banks <neale@lowendale.com.au> December 2000
 287 *
 288 * Legend: U = unusable with APM patches
 289 *         P = partially usable with APM patches
 290 */
 291
 292/*
 293 * Define as 1 to make the driver always call the APM BIOS busy
 294 * routine even if the clock was not reported as slowed by the
 295 * idle routine.  Otherwise, define as 0.
 296 */
 297#define ALWAYS_CALL_BUSY   1
 298
 299/*
 300 * Define to make the APM BIOS calls zero all data segment registers (so
 301 * that an incorrect BIOS implementation will cause a kernel panic if it
 302 * tries to write to arbitrary memory).
 303 */
 304#define APM_ZERO_SEGS
 305
 306#include <asm/apm.h>
 307
 308/*
 309 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
 310 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
 311 * David Chen <chen@ctpa04.mit.edu>
 312 */
 313#undef INIT_TIMER_AFTER_SUSPEND
 314
 315#ifdef INIT_TIMER_AFTER_SUSPEND
 316#include <linux/timex.h>
 317#include <asm/io.h>
 318#include <linux/delay.h>
 319#endif
 320
 321/*
 322 * Need to poll the APM BIOS every second
 323 */
 324#define APM_CHECK_TIMEOUT	(HZ)
 325
 326/*
 327 * Ignore suspend events for this amount of time after a resume
 328 */
 329#define DEFAULT_BOUNCE_INTERVAL	(3 * HZ)
 330
 331/*
 332 * Maximum number of events stored
 333 */
 334#define APM_MAX_EVENTS		20
 335
 336/*
 337 * The per-file APM data
 338 */
 339struct apm_user {
 340	int		magic;
 341	struct apm_user *next;
 342	unsigned int	suser: 1;
 343	unsigned int	writer: 1;
 344	unsigned int	reader: 1;
 345	unsigned int	suspend_wait: 1;
 346	int		suspend_result;
 347	int		suspends_pending;
 348	int		standbys_pending;
 349	int		suspends_read;
 350	int		standbys_read;
 351	int		event_head;
 352	int		event_tail;
 353	apm_event_t	events[APM_MAX_EVENTS];
 354};
 355
 356/*
 357 * The magic number in apm_user
 358 */
 359#define APM_BIOS_MAGIC		0x4101
 360
 361/*
 362 * idle percentage above which bios idle calls are done
 363 */
 364#ifdef CONFIG_APM_CPU_IDLE
 
 365#define DEFAULT_IDLE_THRESHOLD	95
 366#else
 367#define DEFAULT_IDLE_THRESHOLD	100
 368#endif
 369#define DEFAULT_IDLE_PERIOD	(100 / 3)
 370
 371static int apm_cpu_idle(struct cpuidle_device *dev,
 372			struct cpuidle_driver *drv, int index);
 373
 374static struct cpuidle_driver apm_idle_driver = {
 375	.name = "apm_idle",
 376	.owner = THIS_MODULE,
 377	.states = {
 378		{ /* entry 0 is for polling */ },
 379		{ /* entry 1 is for APM idle */
 380			.name = "APM",
 381			.desc = "APM idle",
 382			.exit_latency = 250,	/* WAG */
 383			.target_residency = 500,	/* WAG */
 384			.enter = &apm_cpu_idle
 385		},
 386	},
 387	.state_count = 2,
 388};
 389
 390static struct cpuidle_device apm_cpuidle_device;
 391
 392/*
 393 * Local variables
 394 */
 395__visible struct {
 396	unsigned long	offset;
 397	unsigned short	segment;
 398} apm_bios_entry;
 399static int clock_slowed;
 400static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
 401static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
 
 402static int suspends_pending;
 403static int standbys_pending;
 404static int ignore_sys_suspend;
 405static int ignore_normal_resume;
 406static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
 407
 408static bool debug __read_mostly;
 409static bool smp __read_mostly;
 410static int apm_disabled = -1;
 411#ifdef CONFIG_SMP
 412static bool power_off;
 413#else
 414static bool power_off = 1;
 415#endif
 416static bool realmode_power_off;
 417#ifdef CONFIG_APM_ALLOW_INTS
 418static bool allow_ints = 1;
 419#else
 420static bool allow_ints;
 421#endif
 422static bool broken_psr;
 423
 424static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
 425static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
 426static struct apm_user *user_list;
 427static DEFINE_SPINLOCK(user_list_lock);
 428static DEFINE_MUTEX(apm_mutex);
 429
 430/*
 431 * Set up a segment that references the real mode segment 0x40
 432 * that extends up to the end of page zero (that we have reserved).
 433 * This is for buggy BIOS's that refer to (real mode) segment 0x40
 434 * even though they are called in protected mode.
 435 */
 436static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
 437			(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
 438
 439static const char driver_version[] = "1.16ac";	/* no spaces */
 440
 441static struct task_struct *kapmd_task;
 442
 443/*
 444 *	APM event names taken from the APM 1.2 specification. These are
 445 *	the message codes that the BIOS uses to tell us about events
 446 */
 447static const char * const apm_event_name[] = {
 448	"system standby",
 449	"system suspend",
 450	"normal resume",
 451	"critical resume",
 452	"low battery",
 453	"power status change",
 454	"update time",
 455	"critical suspend",
 456	"user standby",
 457	"user suspend",
 458	"system standby resume",
 459	"capabilities change"
 460};
 461#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
 462
 463typedef struct lookup_t {
 464	int	key;
 465	char 	*msg;
 466} lookup_t;
 467
 468/*
 469 *	The BIOS returns a set of standard error codes in AX when the
 470 *	carry flag is set.
 471 */
 472
 473static const lookup_t error_table[] = {
 474/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
 475	{ APM_DISABLED,		"Power management disabled" },
 476	{ APM_CONNECTED,	"Real mode interface already connected" },
 477	{ APM_NOT_CONNECTED,	"Interface not connected" },
 478	{ APM_16_CONNECTED,	"16 bit interface already connected" },
 479/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
 480	{ APM_32_CONNECTED,	"32 bit interface already connected" },
 481	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
 482	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
 483	{ APM_BAD_PARAM,	"Parameter out of range" },
 484	{ APM_NOT_ENGAGED,	"Interface not engaged" },
 485	{ APM_BAD_FUNCTION,     "Function not supported" },
 486	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
 487	{ APM_BAD_STATE,	"Unable to enter requested state" },
 488/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
 489	{ APM_NO_ERROR,		"BIOS did not set a return code" },
 490	{ APM_NOT_PRESENT,	"No APM present" }
 491};
 492#define ERROR_COUNT	ARRAY_SIZE(error_table)
 493
 494/**
 495 *	apm_error	-	display an APM error
 496 *	@str: information string
 497 *	@err: APM BIOS return code
 498 *
 499 *	Write a meaningful log entry to the kernel log in the event of
 500 *	an APM error.  Note that this also handles (negative) kernel errors.
 501 */
 502
 503static void apm_error(char *str, int err)
 504{
 505	int i;
 506
 507	for (i = 0; i < ERROR_COUNT; i++)
 508		if (error_table[i].key == err)
 509			break;
 510	if (i < ERROR_COUNT)
 511		pr_notice("%s: %s\n", str, error_table[i].msg);
 512	else if (err < 0)
 513		pr_notice("%s: linux error code %i\n", str, err);
 514	else
 515		pr_notice("%s: unknown error code %#2.2x\n",
 516		       str, err);
 517}
 518
 519/*
 520 * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
 521 * apm_info.allow_ints, we are being really paranoid here!  Not only
 522 * are interrupts disabled, but all the segment registers (except SS)
 523 * are saved and zeroed this means that if the BIOS tries to reference
 524 * any data without explicitly loading the segment registers, the kernel
 525 * will fault immediately rather than have some unforeseen circumstances
 526 * for the rest of the kernel.  And it will be very obvious!  :-) Doing
 527 * this depends on CS referring to the same physical memory as DS so that
 528 * DS can be zeroed before the call. Unfortunately, we can't do anything
 529 * about the stack segment/pointer.  Also, we tell the compiler that
 530 * everything could change.
 531 *
 532 * Also, we KNOW that for the non error case of apm_bios_call, there
 533 * is no useful data returned in the low order 8 bits of eax.
 534 */
 535
 536static inline unsigned long __apm_irq_save(void)
 537{
 538	unsigned long flags;
 539	local_save_flags(flags);
 540	if (apm_info.allow_ints) {
 541		if (irqs_disabled_flags(flags))
 542			local_irq_enable();
 543	} else
 544		local_irq_disable();
 545
 546	return flags;
 547}
 548
 549#define apm_irq_save(flags) \
 550	do { flags = __apm_irq_save(); } while (0)
 551
 552static inline void apm_irq_restore(unsigned long flags)
 553{
 554	if (irqs_disabled_flags(flags))
 555		local_irq_disable();
 556	else if (irqs_disabled())
 557		local_irq_enable();
 558}
 559
 560#ifdef APM_ZERO_SEGS
 561#	define APM_DECL_SEGS \
 562		unsigned int saved_fs; unsigned int saved_gs;
 563#	define APM_DO_SAVE_SEGS \
 564		savesegment(fs, saved_fs); savesegment(gs, saved_gs)
 565#	define APM_DO_RESTORE_SEGS \
 566		loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
 567#else
 568#	define APM_DECL_SEGS
 569#	define APM_DO_SAVE_SEGS
 570#	define APM_DO_RESTORE_SEGS
 571#endif
 572
 573struct apm_bios_call {
 574	u32 func;
 575	/* In and out */
 576	u32 ebx;
 577	u32 ecx;
 578	/* Out only */
 579	u32 eax;
 580	u32 edx;
 581	u32 esi;
 582
 583	/* Error: -ENOMEM, or bits 8-15 of eax */
 584	int err;
 585};
 586
 587/**
 588 *	__apm_bios_call - Make an APM BIOS 32bit call
 589 *	@_call: pointer to struct apm_bios_call.
 590 *
 591 *	Make an APM call using the 32bit protected mode interface. The
 592 *	caller is responsible for knowing if APM BIOS is configured and
 593 *	enabled. This call can disable interrupts for a long period of
 594 *	time on some laptops.  The return value is in AH and the carry
 595 *	flag is loaded into AL.  If there is an error, then the error
 596 *	code is returned in AH (bits 8-15 of eax) and this function
 597 *	returns non-zero.
 598 *
 599 *	Note: this makes the call on the current CPU.
 600 */
 601static long __apm_bios_call(void *_call)
 602{
 603	APM_DECL_SEGS
 604	unsigned long		flags;
 605	int			cpu;
 606	struct desc_struct	save_desc_40;
 607	struct desc_struct	*gdt;
 608	struct apm_bios_call	*call = _call;
 609
 610	cpu = get_cpu();
 611	BUG_ON(cpu != 0);
 612	gdt = get_cpu_gdt_rw(cpu);
 613	save_desc_40 = gdt[0x40 / 8];
 614	gdt[0x40 / 8] = bad_bios_desc;
 615
 616	apm_irq_save(flags);
 617	APM_DO_SAVE_SEGS;
 618	apm_bios_call_asm(call->func, call->ebx, call->ecx,
 619			  &call->eax, &call->ebx, &call->ecx, &call->edx,
 620			  &call->esi);
 621	APM_DO_RESTORE_SEGS;
 622	apm_irq_restore(flags);
 623	gdt[0x40 / 8] = save_desc_40;
 624	put_cpu();
 625
 626	return call->eax & 0xff;
 627}
 628
 629/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
 630static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
 631{
 632	int ret;
 633
 634	/* Don't bother with work_on_cpu in the common case, so we don't
 635	 * have to worry about OOM or overhead. */
 636	if (get_cpu() == 0) {
 637		ret = fn(call);
 638		put_cpu();
 639	} else {
 640		put_cpu();
 641		ret = work_on_cpu(0, fn, call);
 642	}
 643
 644	/* work_on_cpu can fail with -ENOMEM */
 645	if (ret < 0)
 646		call->err = ret;
 647	else
 648		call->err = (call->eax >> 8) & 0xff;
 649
 650	return ret;
 651}
 652
 653/**
 654 *	apm_bios_call	-	Make an APM BIOS 32bit call (on CPU 0)
 655 *	@call: the apm_bios_call registers.
 656 *
 657 *	If there is an error, it is returned in @call.err.
 658 */
 659static int apm_bios_call(struct apm_bios_call *call)
 660{
 661	return on_cpu0(__apm_bios_call, call);
 662}
 663
 664/**
 665 *	__apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
 666 *	@_call: pointer to struct apm_bios_call.
 667 *
 668 *	Make a BIOS call that returns one value only, or just status.
 669 *	If there is an error, then the error code is returned in AH
 670 *	(bits 8-15 of eax) and this function returns non-zero (it can
 671 *	also return -ENOMEM). This is used for simpler BIOS operations.
 672 *	This call may hold interrupts off for a long time on some laptops.
 673 *
 674 *	Note: this makes the call on the current CPU.
 675 */
 676static long __apm_bios_call_simple(void *_call)
 677{
 678	u8			error;
 679	APM_DECL_SEGS
 680	unsigned long		flags;
 681	int			cpu;
 682	struct desc_struct	save_desc_40;
 683	struct desc_struct	*gdt;
 684	struct apm_bios_call	*call = _call;
 685
 686	cpu = get_cpu();
 687	BUG_ON(cpu != 0);
 688	gdt = get_cpu_gdt_rw(cpu);
 689	save_desc_40 = gdt[0x40 / 8];
 690	gdt[0x40 / 8] = bad_bios_desc;
 691
 692	apm_irq_save(flags);
 693	APM_DO_SAVE_SEGS;
 694	error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
 695					 &call->eax);
 696	APM_DO_RESTORE_SEGS;
 697	apm_irq_restore(flags);
 698	gdt[0x40 / 8] = save_desc_40;
 699	put_cpu();
 700	return error;
 701}
 702
 703/**
 704 *	apm_bios_call_simple	-	make a simple APM BIOS 32bit call
 705 *	@func: APM function to invoke
 706 *	@ebx_in: EBX register value for BIOS call
 707 *	@ecx_in: ECX register value for BIOS call
 708 *	@eax: EAX register on return from the BIOS call
 709 *	@err: bits
 710 *
 711 *	Make a BIOS call that returns one value only, or just status.
 712 *	If there is an error, then the error code is returned in @err
 713 *	and this function returns non-zero. This is used for simpler
 714 *	BIOS operations.  This call may hold interrupts off for a long
 715 *	time on some laptops.
 716 */
 717static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
 718				int *err)
 719{
 720	struct apm_bios_call call;
 721	int ret;
 722
 723	call.func = func;
 724	call.ebx = ebx_in;
 725	call.ecx = ecx_in;
 726
 727	ret = on_cpu0(__apm_bios_call_simple, &call);
 728	*eax = call.eax;
 729	*err = call.err;
 730	return ret;
 731}
 732
 733/**
 734 *	apm_driver_version	-	APM driver version
 735 *	@val:	loaded with the APM version on return
 736 *
 737 *	Retrieve the APM version supported by the BIOS. This is only
 738 *	supported for APM 1.1 or higher. An error indicates APM 1.0 is
 739 *	probably present.
 740 *
 741 *	On entry val should point to a value indicating the APM driver
 742 *	version with the high byte being the major and the low byte the
 743 *	minor number both in BCD
 744 *
 745 *	On return it will hold the BIOS revision supported in the
 746 *	same format.
 747 */
 748
 749static int apm_driver_version(u_short *val)
 750{
 751	u32 eax;
 752	int err;
 753
 754	if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
 755		return err;
 756	*val = eax;
 757	return APM_SUCCESS;
 758}
 759
 760/**
 761 *	apm_get_event	-	get an APM event from the BIOS
 762 *	@event: pointer to the event
 763 *	@info: point to the event information
 764 *
 765 *	The APM BIOS provides a polled information for event
 766 *	reporting. The BIOS expects to be polled at least every second
 767 *	when events are pending. When a message is found the caller should
 768 *	poll until no more messages are present.  However, this causes
 769 *	problems on some laptops where a suspend event notification is
 770 *	not cleared until it is acknowledged.
 771 *
 772 *	Additional information is returned in the info pointer, providing
 773 *	that APM 1.2 is in use. If no messges are pending the value 0x80
 774 *	is returned (No power management events pending).
 775 */
 776static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
 777{
 778	struct apm_bios_call call;
 779
 780	call.func = APM_FUNC_GET_EVENT;
 781	call.ebx = call.ecx = 0;
 782
 783	if (apm_bios_call(&call))
 784		return call.err;
 785
 786	*event = call.ebx;
 787	if (apm_info.connection_version < 0x0102)
 788		*info = ~0; /* indicate info not valid */
 789	else
 790		*info = call.ecx;
 791	return APM_SUCCESS;
 792}
 793
 794/**
 795 *	set_power_state	-	set the power management state
 796 *	@what: which items to transition
 797 *	@state: state to transition to
 798 *
 799 *	Request an APM change of state for one or more system devices. The
 800 *	processor state must be transitioned last of all. what holds the
 801 *	class of device in the upper byte and the device number (0xFF for
 802 *	all) for the object to be transitioned.
 803 *
 804 *	The state holds the state to transition to, which may in fact
 805 *	be an acceptance of a BIOS requested state change.
 806 */
 807
 808static int set_power_state(u_short what, u_short state)
 809{
 810	u32 eax;
 811	int err;
 812
 813	if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
 814		return err;
 815	return APM_SUCCESS;
 816}
 817
 818/**
 819 *	set_system_power_state - set system wide power state
 820 *	@state: which state to enter
 821 *
 822 *	Transition the entire system into a new APM power state.
 823 */
 824
 825static int set_system_power_state(u_short state)
 826{
 827	return set_power_state(APM_DEVICE_ALL, state);
 828}
 829
 830/**
 831 *	apm_do_idle	-	perform power saving
 832 *
 833 *	This function notifies the BIOS that the processor is (in the view
 834 *	of the OS) idle. It returns -1 in the event that the BIOS refuses
 835 *	to handle the idle request. On a success the function returns 1
 836 *	if the BIOS did clock slowing or 0 otherwise.
 837 */
 838
 839static int apm_do_idle(void)
 840{
 841	u32 eax;
 842	u8 ret = 0;
 843	int idled = 0;
 
 844	int err = 0;
 845
 
 
 
 
 
 
 
 
 
 846	if (!need_resched()) {
 847		idled = 1;
 848		ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
 849	}
 
 
 850
 851	if (!idled)
 852		return 0;
 853
 854	if (ret) {
 855		static unsigned long t;
 856
 857		/* This always fails on some SMP boards running UP kernels.
 858		 * Only report the failure the first 5 times.
 859		 */
 860		if (++t < 5) {
 861			printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
 862			t = jiffies;
 863		}
 864		return -1;
 865	}
 866	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
 867	return clock_slowed;
 868}
 869
 870/**
 871 *	apm_do_busy	-	inform the BIOS the CPU is busy
 872 *
 873 *	Request that the BIOS brings the CPU back to full performance.
 874 */
 875
 876static void apm_do_busy(void)
 877{
 878	u32 dummy;
 879	int err;
 880
 881	if (clock_slowed || ALWAYS_CALL_BUSY) {
 882		(void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
 883		clock_slowed = 0;
 884	}
 885}
 886
 887/*
 888 * If no process has really been interested in
 889 * the CPU for some time, we want to call BIOS
 890 * power management - we probably want
 891 * to conserve power.
 892 */
 893#define IDLE_CALC_LIMIT	(HZ * 100)
 894#define IDLE_LEAKY_MAX	16
 895
 
 
 896/**
 897 * apm_cpu_idle		-	cpu idling for APM capable Linux
 898 *
 899 * This is the idling function the kernel executes when APM is available. It
 900 * tries to do BIOS powermanagement based on the average system idle time.
 901 * Furthermore it calls the system default idle routine.
 902 */
 903
 904static int apm_cpu_idle(struct cpuidle_device *dev,
 905	struct cpuidle_driver *drv, int index)
 906{
 907	static int use_apm_idle; /* = 0 */
 908	static unsigned int last_jiffies; /* = 0 */
 909	static u64 last_stime; /* = 0 */
 910	u64 stime, utime;
 911
 912	int apm_idle_done = 0;
 913	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
 914	unsigned int bucket;
 915
 
 916recalc:
 917	task_cputime(current, &utime, &stime);
 918	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
 919		use_apm_idle = 0;
 
 
 920	} else if (jiffies_since_last_check > idle_period) {
 921		unsigned int idle_percentage;
 922
 923		idle_percentage = nsecs_to_jiffies(stime - last_stime);
 924		idle_percentage *= 100;
 925		idle_percentage /= jiffies_since_last_check;
 926		use_apm_idle = (idle_percentage > idle_threshold);
 927		if (apm_info.forbid_idle)
 928			use_apm_idle = 0;
 
 
 929	}
 930
 931	last_jiffies = jiffies;
 932	last_stime = stime;
 933
 934	bucket = IDLE_LEAKY_MAX;
 935
 936	while (!need_resched()) {
 937		if (use_apm_idle) {
 938			unsigned int t;
 939
 940			t = jiffies;
 941			switch (apm_do_idle()) {
 942			case 0:
 943				apm_idle_done = 1;
 944				if (t != jiffies) {
 945					if (bucket) {
 946						bucket = IDLE_LEAKY_MAX;
 947						continue;
 948					}
 949				} else if (bucket) {
 950					bucket--;
 951					continue;
 952				}
 953				break;
 954			case 1:
 955				apm_idle_done = 1;
 956				break;
 957			default: /* BIOS refused */
 958				break;
 959			}
 960		}
 961		default_idle();
 
 
 
 962		local_irq_disable();
 963		jiffies_since_last_check = jiffies - last_jiffies;
 964		if (jiffies_since_last_check > idle_period)
 965			goto recalc;
 966	}
 967
 968	if (apm_idle_done)
 969		apm_do_busy();
 970
 971	return index;
 972}
 973
 974/**
 975 *	apm_power_off	-	ask the BIOS to power off
 976 *
 977 *	Handle the power off sequence. This is the one piece of code we
 978 *	will execute even on SMP machines. In order to deal with BIOS
 979 *	bugs we support real mode APM BIOS power off calls. We also make
 980 *	the SMP call on CPU0 as some systems will only honour this call
 981 *	on their first cpu.
 982 */
 983
 984static void apm_power_off(void)
 985{
 986	/* Some bioses don't like being called from CPU != 0 */
 987	if (apm_info.realmode_power_off) {
 988		set_cpus_allowed_ptr(current, cpumask_of(0));
 989		machine_real_restart(MRR_APM);
 990	} else {
 991		(void)set_system_power_state(APM_STATE_OFF);
 992	}
 993}
 994
 995#ifdef CONFIG_APM_DO_ENABLE
 996
 997/**
 998 *	apm_enable_power_management - enable BIOS APM power management
 999 *	@enable: enable yes/no
1000 *
1001 *	Enable or disable the APM BIOS power services.
1002 */
1003
1004static int apm_enable_power_management(int enable)
1005{
1006	u32 eax;
1007	int err;
1008
1009	if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1010		return APM_NOT_ENGAGED;
1011	if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1012				 enable, &eax, &err))
1013		return err;
1014	if (enable)
1015		apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1016	else
1017		apm_info.bios.flags |= APM_BIOS_DISABLED;
1018	return APM_SUCCESS;
1019}
1020#endif
1021
1022/**
1023 *	apm_get_power_status	-	get current power state
1024 *	@status: returned status
1025 *	@bat: battery info
1026 *	@life: estimated life
1027 *
1028 *	Obtain the current power status from the APM BIOS. We return a
1029 *	status which gives the rough battery status, and current power
1030 *	source. The bat value returned give an estimate as a percentage
1031 *	of life and a status value for the battery. The estimated life
1032 *	if reported is a lifetime in secodnds/minutes at current powwer
1033 *	consumption.
1034 */
1035
1036static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1037{
1038	struct apm_bios_call call;
1039
1040	call.func = APM_FUNC_GET_STATUS;
1041	call.ebx = APM_DEVICE_ALL;
1042	call.ecx = 0;
1043
1044	if (apm_info.get_power_status_broken)
1045		return APM_32_UNSUPPORTED;
1046	if (apm_bios_call(&call)) {
1047		if (!call.err)
1048			return APM_NO_ERROR;
1049		return call.err;
1050	}
1051	*status = call.ebx;
1052	*bat = call.ecx;
1053	if (apm_info.get_power_status_swabinminutes) {
1054		*life = swab16((u16)call.edx);
1055		*life |= 0x8000;
1056	} else
1057		*life = call.edx;
1058	return APM_SUCCESS;
1059}
1060
1061#if 0
1062static int apm_get_battery_status(u_short which, u_short *status,
1063				  u_short *bat, u_short *life, u_short *nbat)
1064{
1065	u32 eax;
1066	u32 ebx;
1067	u32 ecx;
1068	u32 edx;
1069	u32 esi;
1070
1071	if (apm_info.connection_version < 0x0102) {
1072		/* pretend we only have one battery. */
1073		if (which != 1)
1074			return APM_BAD_DEVICE;
1075		*nbat = 1;
1076		return apm_get_power_status(status, bat, life);
1077	}
1078
1079	if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1080			  &ebx, &ecx, &edx, &esi))
1081		return (eax >> 8) & 0xff;
1082	*status = ebx;
1083	*bat = ecx;
1084	*life = edx;
1085	*nbat = esi;
1086	return APM_SUCCESS;
1087}
1088#endif
1089
1090/**
1091 *	apm_engage_power_management	-	enable PM on a device
1092 *	@device: identity of device
1093 *	@enable: on/off
1094 *
1095 *	Activate or deactivate power management on either a specific device
1096 *	or the entire system (%APM_DEVICE_ALL).
1097 */
1098
1099static int apm_engage_power_management(u_short device, int enable)
1100{
1101	u32 eax;
1102	int err;
1103
1104	if ((enable == 0) && (device == APM_DEVICE_ALL)
1105	    && (apm_info.bios.flags & APM_BIOS_DISABLED))
1106		return APM_DISABLED;
1107	if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1108				 &eax, &err))
1109		return err;
1110	if (device == APM_DEVICE_ALL) {
1111		if (enable)
1112			apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1113		else
1114			apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1115	}
1116	return APM_SUCCESS;
1117}
1118
1119#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1120
1121/**
1122 *	apm_console_blank	-	blank the display
1123 *	@blank: on/off
1124 *
1125 *	Attempt to blank the console, firstly by blanking just video device
1126 *	zero, and if that fails (some BIOSes don't support it) then it blanks
1127 *	all video devices. Typically the BIOS will do laptop backlight and
1128 *	monitor powerdown for us.
1129 */
1130
1131static int apm_console_blank(int blank)
1132{
1133	int error = APM_NOT_ENGAGED; /* silence gcc */
1134	int i;
1135	u_short state;
1136	static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1137
1138	state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1139
1140	for (i = 0; i < ARRAY_SIZE(dev); i++) {
1141		error = set_power_state(dev[i], state);
1142
1143		if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1144			return 1;
1145
1146		if (error == APM_NOT_ENGAGED)
1147			break;
1148	}
1149
1150	if (error == APM_NOT_ENGAGED) {
1151		static int tried;
1152		int eng_error;
1153		if (tried++ == 0) {
1154			eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1155			if (eng_error) {
1156				apm_error("set display", error);
1157				apm_error("engage interface", eng_error);
1158				return 0;
1159			} else
1160				return apm_console_blank(blank);
1161		}
1162	}
1163	apm_error("set display", error);
1164	return 0;
1165}
1166#endif
1167
1168static int queue_empty(struct apm_user *as)
1169{
1170	return as->event_head == as->event_tail;
1171}
1172
1173static apm_event_t get_queued_event(struct apm_user *as)
1174{
1175	if (++as->event_tail >= APM_MAX_EVENTS)
1176		as->event_tail = 0;
1177	return as->events[as->event_tail];
1178}
1179
1180static void queue_event(apm_event_t event, struct apm_user *sender)
1181{
1182	struct apm_user *as;
1183
1184	spin_lock(&user_list_lock);
1185	if (user_list == NULL)
1186		goto out;
1187	for (as = user_list; as != NULL; as = as->next) {
1188		if ((as == sender) || (!as->reader))
1189			continue;
1190		if (++as->event_head >= APM_MAX_EVENTS)
1191			as->event_head = 0;
1192
1193		if (as->event_head == as->event_tail) {
1194			static int notified;
1195
1196			if (notified++ == 0)
1197				pr_err("an event queue overflowed\n");
1198			if (++as->event_tail >= APM_MAX_EVENTS)
1199				as->event_tail = 0;
1200		}
1201		as->events[as->event_head] = event;
1202		if (!as->suser || !as->writer)
1203			continue;
1204		switch (event) {
1205		case APM_SYS_SUSPEND:
1206		case APM_USER_SUSPEND:
1207			as->suspends_pending++;
1208			suspends_pending++;
1209			break;
1210
1211		case APM_SYS_STANDBY:
1212		case APM_USER_STANDBY:
1213			as->standbys_pending++;
1214			standbys_pending++;
1215			break;
1216		}
1217	}
1218	wake_up_interruptible(&apm_waitqueue);
1219out:
1220	spin_unlock(&user_list_lock);
1221}
1222
1223static void reinit_timer(void)
1224{
1225#ifdef INIT_TIMER_AFTER_SUSPEND
1226	unsigned long flags;
1227
1228	raw_spin_lock_irqsave(&i8253_lock, flags);
1229	/* set the clock to HZ */
1230	outb_p(0x34, PIT_MODE);		/* binary, mode 2, LSB/MSB, ch 0 */
1231	udelay(10);
1232	outb_p(LATCH & 0xff, PIT_CH0);	/* LSB */
1233	udelay(10);
1234	outb_p(LATCH >> 8, PIT_CH0);	/* MSB */
1235	udelay(10);
1236	raw_spin_unlock_irqrestore(&i8253_lock, flags);
1237#endif
1238}
1239
1240static int suspend(int vetoable)
1241{
1242	int err;
1243	struct apm_user	*as;
1244
1245	dpm_suspend_start(PMSG_SUSPEND);
1246	dpm_suspend_end(PMSG_SUSPEND);
 
1247
1248	local_irq_disable();
1249	syscore_suspend();
1250
1251	local_irq_enable();
1252
1253	save_processor_state();
1254	err = set_system_power_state(APM_STATE_SUSPEND);
1255	ignore_normal_resume = 1;
1256	restore_processor_state();
1257
1258	local_irq_disable();
1259	reinit_timer();
1260
1261	if (err == APM_NO_ERROR)
1262		err = APM_SUCCESS;
1263	if (err != APM_SUCCESS)
1264		apm_error("suspend", err);
1265	err = (err == APM_SUCCESS) ? 0 : -EIO;
1266
1267	syscore_resume();
1268	local_irq_enable();
1269
1270	dpm_resume_start(PMSG_RESUME);
1271	dpm_resume_end(PMSG_RESUME);
1272
 
1273	queue_event(APM_NORMAL_RESUME, NULL);
1274	spin_lock(&user_list_lock);
1275	for (as = user_list; as != NULL; as = as->next) {
1276		as->suspend_wait = 0;
1277		as->suspend_result = err;
1278	}
1279	spin_unlock(&user_list_lock);
1280	wake_up_interruptible(&apm_suspend_waitqueue);
1281	return err;
1282}
1283
1284static void standby(void)
1285{
1286	int err;
1287
1288	dpm_suspend_end(PMSG_SUSPEND);
1289
1290	local_irq_disable();
1291	syscore_suspend();
1292	local_irq_enable();
1293
1294	err = set_system_power_state(APM_STATE_STANDBY);
1295	if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1296		apm_error("standby", err);
1297
1298	local_irq_disable();
1299	syscore_resume();
1300	local_irq_enable();
1301
1302	dpm_resume_start(PMSG_RESUME);
1303}
1304
1305static apm_event_t get_event(void)
1306{
1307	int error;
1308	apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1309	apm_eventinfo_t	info;
1310
1311	static int notified;
1312
1313	/* we don't use the eventinfo */
1314	error = apm_get_event(&event, &info);
1315	if (error == APM_SUCCESS)
1316		return event;
1317
1318	if ((error != APM_NO_EVENTS) && (notified++ == 0))
1319		apm_error("get_event", error);
1320
1321	return 0;
1322}
1323
1324static void check_events(void)
1325{
1326	apm_event_t event;
1327	static unsigned long last_resume;
1328	static int ignore_bounce;
1329
1330	while ((event = get_event()) != 0) {
1331		if (debug) {
1332			if (event <= NR_APM_EVENT_NAME)
1333				printk(KERN_DEBUG "apm: received %s notify\n",
1334				       apm_event_name[event - 1]);
1335			else
1336				printk(KERN_DEBUG "apm: received unknown "
1337				       "event 0x%02x\n", event);
1338		}
1339		if (ignore_bounce
1340		    && (time_after(jiffies, last_resume + bounce_interval)))
1341			ignore_bounce = 0;
1342
1343		switch (event) {
1344		case APM_SYS_STANDBY:
1345		case APM_USER_STANDBY:
1346			queue_event(event, NULL);
1347			if (standbys_pending <= 0)
1348				standby();
1349			break;
1350
1351		case APM_USER_SUSPEND:
1352#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1353			if (apm_info.connection_version > 0x100)
1354				set_system_power_state(APM_STATE_REJECT);
1355			break;
1356#endif
1357		case APM_SYS_SUSPEND:
1358			if (ignore_bounce) {
1359				if (apm_info.connection_version > 0x100)
1360					set_system_power_state(APM_STATE_REJECT);
1361				break;
1362			}
1363			/*
1364			 * If we are already processing a SUSPEND,
1365			 * then further SUSPEND events from the BIOS
1366			 * will be ignored.  We also return here to
1367			 * cope with the fact that the Thinkpads keep
1368			 * sending a SUSPEND event until something else
1369			 * happens!
1370			 */
1371			if (ignore_sys_suspend)
1372				return;
1373			ignore_sys_suspend = 1;
1374			queue_event(event, NULL);
1375			if (suspends_pending <= 0)
1376				(void) suspend(1);
1377			break;
1378
1379		case APM_NORMAL_RESUME:
1380		case APM_CRITICAL_RESUME:
1381		case APM_STANDBY_RESUME:
1382			ignore_sys_suspend = 0;
1383			last_resume = jiffies;
1384			ignore_bounce = 1;
1385			if ((event != APM_NORMAL_RESUME)
1386			    || (ignore_normal_resume == 0)) {
1387				dpm_resume_end(PMSG_RESUME);
1388				queue_event(event, NULL);
1389			}
1390			ignore_normal_resume = 0;
1391			break;
1392
1393		case APM_CAPABILITY_CHANGE:
1394		case APM_LOW_BATTERY:
1395		case APM_POWER_STATUS_CHANGE:
1396			queue_event(event, NULL);
1397			/* If needed, notify drivers here */
1398			break;
1399
1400		case APM_UPDATE_TIME:
1401			break;
1402
1403		case APM_CRITICAL_SUSPEND:
1404			/*
1405			 * We are not allowed to reject a critical suspend.
1406			 */
1407			(void)suspend(0);
1408			break;
1409		}
1410	}
1411}
1412
1413static void apm_event_handler(void)
1414{
1415	static int pending_count = 4;
1416	int err;
1417
1418	if ((standbys_pending > 0) || (suspends_pending > 0)) {
1419		if ((apm_info.connection_version > 0x100) &&
1420		    (pending_count-- <= 0)) {
1421			pending_count = 4;
1422			if (debug)
1423				printk(KERN_DEBUG "apm: setting state busy\n");
1424			err = set_system_power_state(APM_STATE_BUSY);
1425			if (err)
1426				apm_error("busy", err);
1427		}
1428	} else
1429		pending_count = 4;
1430	check_events();
1431}
1432
1433/*
1434 * This is the APM thread main loop.
1435 */
1436
1437static void apm_mainloop(void)
1438{
1439	DECLARE_WAITQUEUE(wait, current);
1440
1441	add_wait_queue(&apm_waitqueue, &wait);
1442	set_current_state(TASK_INTERRUPTIBLE);
1443	for (;;) {
1444		schedule_timeout(APM_CHECK_TIMEOUT);
1445		if (kthread_should_stop())
1446			break;
1447		/*
1448		 * Ok, check all events, check for idle (and mark us sleeping
1449		 * so as not to count towards the load average)..
1450		 */
1451		set_current_state(TASK_INTERRUPTIBLE);
1452		apm_event_handler();
1453	}
1454	remove_wait_queue(&apm_waitqueue, &wait);
1455}
1456
1457static int check_apm_user(struct apm_user *as, const char *func)
1458{
1459	if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1460		pr_err("%s passed bad filp\n", func);
1461		return 1;
1462	}
1463	return 0;
1464}
1465
1466static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1467{
1468	struct apm_user *as;
1469	int i;
1470	apm_event_t event;
1471
1472	as = fp->private_data;
1473	if (check_apm_user(as, "read"))
1474		return -EIO;
1475	if ((int)count < sizeof(apm_event_t))
1476		return -EINVAL;
1477	if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1478		return -EAGAIN;
1479	wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1480	i = count;
1481	while ((i >= sizeof(event)) && !queue_empty(as)) {
1482		event = get_queued_event(as);
1483		if (copy_to_user(buf, &event, sizeof(event))) {
1484			if (i < count)
1485				break;
1486			return -EFAULT;
1487		}
1488		switch (event) {
1489		case APM_SYS_SUSPEND:
1490		case APM_USER_SUSPEND:
1491			as->suspends_read++;
1492			break;
1493
1494		case APM_SYS_STANDBY:
1495		case APM_USER_STANDBY:
1496			as->standbys_read++;
1497			break;
1498		}
1499		buf += sizeof(event);
1500		i -= sizeof(event);
1501	}
1502	if (i < count)
1503		return count - i;
1504	if (signal_pending(current))
1505		return -ERESTARTSYS;
1506	return 0;
1507}
1508
1509static __poll_t do_poll(struct file *fp, poll_table *wait)
1510{
1511	struct apm_user *as;
1512
1513	as = fp->private_data;
1514	if (check_apm_user(as, "poll"))
1515		return 0;
1516	poll_wait(fp, &apm_waitqueue, wait);
1517	if (!queue_empty(as))
1518		return EPOLLIN | EPOLLRDNORM;
1519	return 0;
1520}
1521
1522static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1523{
1524	struct apm_user *as;
1525	int ret;
1526
1527	as = filp->private_data;
1528	if (check_apm_user(as, "ioctl"))
1529		return -EIO;
1530	if (!as->suser || !as->writer)
1531		return -EPERM;
1532	switch (cmd) {
1533	case APM_IOC_STANDBY:
1534		mutex_lock(&apm_mutex);
1535		if (as->standbys_read > 0) {
1536			as->standbys_read--;
1537			as->standbys_pending--;
1538			standbys_pending--;
1539		} else
1540			queue_event(APM_USER_STANDBY, as);
1541		if (standbys_pending <= 0)
1542			standby();
1543		mutex_unlock(&apm_mutex);
1544		break;
1545	case APM_IOC_SUSPEND:
1546		mutex_lock(&apm_mutex);
1547		if (as->suspends_read > 0) {
1548			as->suspends_read--;
1549			as->suspends_pending--;
1550			suspends_pending--;
1551		} else
1552			queue_event(APM_USER_SUSPEND, as);
1553		if (suspends_pending <= 0) {
1554			ret = suspend(1);
1555			mutex_unlock(&apm_mutex);
1556		} else {
1557			as->suspend_wait = 1;
1558			mutex_unlock(&apm_mutex);
1559			wait_event_interruptible(apm_suspend_waitqueue,
1560					as->suspend_wait == 0);
1561			ret = as->suspend_result;
1562		}
1563		return ret;
1564	default:
1565		return -ENOTTY;
1566	}
1567	return 0;
1568}
1569
1570static int do_release(struct inode *inode, struct file *filp)
1571{
1572	struct apm_user *as;
1573
1574	as = filp->private_data;
1575	if (check_apm_user(as, "release"))
1576		return 0;
1577	filp->private_data = NULL;
1578	if (as->standbys_pending > 0) {
1579		standbys_pending -= as->standbys_pending;
1580		if (standbys_pending <= 0)
1581			standby();
1582	}
1583	if (as->suspends_pending > 0) {
1584		suspends_pending -= as->suspends_pending;
1585		if (suspends_pending <= 0)
1586			(void) suspend(1);
1587	}
1588	spin_lock(&user_list_lock);
1589	if (user_list == as)
1590		user_list = as->next;
1591	else {
1592		struct apm_user *as1;
1593
1594		for (as1 = user_list;
1595		     (as1 != NULL) && (as1->next != as);
1596		     as1 = as1->next)
1597			;
1598		if (as1 == NULL)
1599			pr_err("filp not in user list\n");
1600		else
1601			as1->next = as->next;
1602	}
1603	spin_unlock(&user_list_lock);
1604	kfree(as);
1605	return 0;
1606}
1607
1608static int do_open(struct inode *inode, struct file *filp)
1609{
1610	struct apm_user *as;
1611
1612	as = kmalloc(sizeof(*as), GFP_KERNEL);
1613	if (as == NULL)
 
 
1614		return -ENOMEM;
1615
1616	as->magic = APM_BIOS_MAGIC;
1617	as->event_tail = as->event_head = 0;
1618	as->suspends_pending = as->standbys_pending = 0;
1619	as->suspends_read = as->standbys_read = 0;
1620	/*
1621	 * XXX - this is a tiny bit broken, when we consider BSD
1622	 * process accounting. If the device is opened by root, we
1623	 * instantly flag that we used superuser privs. Who knows,
1624	 * we might close the device immediately without doing a
1625	 * privileged operation -- cevans
1626	 */
1627	as->suser = capable(CAP_SYS_ADMIN);
1628	as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1629	as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1630	spin_lock(&user_list_lock);
1631	as->next = user_list;
1632	user_list = as;
1633	spin_unlock(&user_list_lock);
1634	filp->private_data = as;
1635	return 0;
1636}
1637
1638static int proc_apm_show(struct seq_file *m, void *v)
1639{
1640	unsigned short	bx;
1641	unsigned short	cx;
1642	unsigned short	dx;
1643	int		error;
1644	unsigned short  ac_line_status = 0xff;
1645	unsigned short  battery_status = 0xff;
1646	unsigned short  battery_flag   = 0xff;
1647	int		percentage     = -1;
1648	int             time_units     = -1;
1649	char            *units         = "?";
1650
1651	if ((num_online_cpus() == 1) &&
1652	    !(error = apm_get_power_status(&bx, &cx, &dx))) {
1653		ac_line_status = (bx >> 8) & 0xff;
1654		battery_status = bx & 0xff;
1655		if ((cx & 0xff) != 0xff)
1656			percentage = cx & 0xff;
1657
1658		if (apm_info.connection_version > 0x100) {
1659			battery_flag = (cx >> 8) & 0xff;
1660			if (dx != 0xffff) {
1661				units = (dx & 0x8000) ? "min" : "sec";
1662				time_units = dx & 0x7fff;
1663			}
1664		}
1665	}
1666	/* Arguments, with symbols from linux/apm_bios.h.  Information is
1667	   from the Get Power Status (0x0a) call unless otherwise noted.
1668
1669	   0) Linux driver version (this will change if format changes)
1670	   1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
1671	   2) APM flags from APM Installation Check (0x00):
1672	      bit 0: APM_16_BIT_SUPPORT
1673	      bit 1: APM_32_BIT_SUPPORT
1674	      bit 2: APM_IDLE_SLOWS_CLOCK
1675	      bit 3: APM_BIOS_DISABLED
1676	      bit 4: APM_BIOS_DISENGAGED
1677	   3) AC line status
1678	      0x00: Off-line
1679	      0x01: On-line
1680	      0x02: On backup power (BIOS >= 1.1 only)
1681	      0xff: Unknown
1682	   4) Battery status
1683	      0x00: High
1684	      0x01: Low
1685	      0x02: Critical
1686	      0x03: Charging
1687	      0x04: Selected battery not present (BIOS >= 1.2 only)
1688	      0xff: Unknown
1689	   5) Battery flag
1690	      bit 0: High
1691	      bit 1: Low
1692	      bit 2: Critical
1693	      bit 3: Charging
1694	      bit 7: No system battery
1695	      0xff: Unknown
1696	   6) Remaining battery life (percentage of charge):
1697	      0-100: valid
1698	      -1: Unknown
1699	   7) Remaining battery life (time units):
1700	      Number of remaining minutes or seconds
1701	      -1: Unknown
1702	   8) min = minutes; sec = seconds */
1703
1704	seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1705		   driver_version,
1706		   (apm_info.bios.version >> 8) & 0xff,
1707		   apm_info.bios.version & 0xff,
1708		   apm_info.bios.flags,
1709		   ac_line_status,
1710		   battery_status,
1711		   battery_flag,
1712		   percentage,
1713		   time_units,
1714		   units);
1715	return 0;
1716}
1717
1718static int proc_apm_open(struct inode *inode, struct file *file)
1719{
1720	return single_open(file, proc_apm_show, NULL);
1721}
1722
1723static const struct file_operations apm_file_ops = {
1724	.owner		= THIS_MODULE,
1725	.open		= proc_apm_open,
1726	.read		= seq_read,
1727	.llseek		= seq_lseek,
1728	.release	= single_release,
1729};
1730
1731static int apm(void *unused)
1732{
1733	unsigned short	bx;
1734	unsigned short	cx;
1735	unsigned short	dx;
1736	int		error;
1737	char 		*power_stat;
1738	char 		*bat_stat;
1739
1740	/* 2002/08/01 - WT
1741	 * This is to avoid random crashes at boot time during initialization
1742	 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1743	 * Some bioses don't like being called from CPU != 0.
1744	 * Method suggested by Ingo Molnar.
1745	 */
1746	set_cpus_allowed_ptr(current, cpumask_of(0));
1747	BUG_ON(smp_processor_id() != 0);
1748
1749	if (apm_info.connection_version == 0) {
1750		apm_info.connection_version = apm_info.bios.version;
1751		if (apm_info.connection_version > 0x100) {
1752			/*
1753			 * We only support BIOSs up to version 1.2
1754			 */
1755			if (apm_info.connection_version > 0x0102)
1756				apm_info.connection_version = 0x0102;
1757			error = apm_driver_version(&apm_info.connection_version);
1758			if (error != APM_SUCCESS) {
1759				apm_error("driver version", error);
1760				/* Fall back to an APM 1.0 connection. */
1761				apm_info.connection_version = 0x100;
1762			}
1763		}
1764	}
1765
1766	if (debug)
1767		printk(KERN_INFO "apm: Connection version %d.%d\n",
1768			(apm_info.connection_version >> 8) & 0xff,
1769			apm_info.connection_version & 0xff);
1770
1771#ifdef CONFIG_APM_DO_ENABLE
1772	if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1773		/*
1774		 * This call causes my NEC UltraLite Versa 33/C to hang if it
1775		 * is booted with PM disabled but not in the docking station.
1776		 * Unfortunate ...
1777		 */
1778		error = apm_enable_power_management(1);
1779		if (error) {
1780			apm_error("enable power management", error);
1781			return -1;
1782		}
1783	}
1784#endif
1785
1786	if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1787	    && (apm_info.connection_version > 0x0100)) {
1788		error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1789		if (error) {
1790			apm_error("engage power management", error);
1791			return -1;
1792		}
1793	}
1794
1795	if (debug && (num_online_cpus() == 1 || smp)) {
1796		error = apm_get_power_status(&bx, &cx, &dx);
1797		if (error)
1798			printk(KERN_INFO "apm: power status not available\n");
1799		else {
1800			switch ((bx >> 8) & 0xff) {
1801			case 0:
1802				power_stat = "off line";
1803				break;
1804			case 1:
1805				power_stat = "on line";
1806				break;
1807			case 2:
1808				power_stat = "on backup power";
1809				break;
1810			default:
1811				power_stat = "unknown";
1812				break;
1813			}
1814			switch (bx & 0xff) {
1815			case 0:
1816				bat_stat = "high";
1817				break;
1818			case 1:
1819				bat_stat = "low";
1820				break;
1821			case 2:
1822				bat_stat = "critical";
1823				break;
1824			case 3:
1825				bat_stat = "charging";
1826				break;
1827			default:
1828				bat_stat = "unknown";
1829				break;
1830			}
1831			printk(KERN_INFO
1832			       "apm: AC %s, battery status %s, battery life ",
1833			       power_stat, bat_stat);
1834			if ((cx & 0xff) == 0xff)
1835				printk("unknown\n");
1836			else
1837				printk("%d%%\n", cx & 0xff);
1838			if (apm_info.connection_version > 0x100) {
1839				printk(KERN_INFO
1840				       "apm: battery flag 0x%02x, battery life ",
1841				       (cx >> 8) & 0xff);
1842				if (dx == 0xffff)
1843					printk("unknown\n");
1844				else
1845					printk("%d %s\n", dx & 0x7fff,
1846					       (dx & 0x8000) ?
1847					       "minutes" : "seconds");
1848			}
1849		}
1850	}
1851
1852	/* Install our power off handler.. */
1853	if (power_off)
1854		pm_power_off = apm_power_off;
1855
1856	if (num_online_cpus() == 1 || smp) {
1857#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1858		console_blank_hook = apm_console_blank;
1859#endif
1860		apm_mainloop();
1861#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1862		console_blank_hook = NULL;
1863#endif
1864	}
1865
1866	return 0;
1867}
1868
1869#ifndef MODULE
1870static int __init apm_setup(char *str)
1871{
1872	int invert;
1873
1874	while ((str != NULL) && (*str != '\0')) {
1875		if (strncmp(str, "off", 3) == 0)
1876			apm_disabled = 1;
1877		if (strncmp(str, "on", 2) == 0)
1878			apm_disabled = 0;
1879		if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1880		    (strncmp(str, "bounce_interval=", 16) == 0))
1881			bounce_interval = simple_strtol(str + 16, NULL, 0);
1882		if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1883		    (strncmp(str, "idle_threshold=", 15) == 0))
1884			idle_threshold = simple_strtol(str + 15, NULL, 0);
1885		if ((strncmp(str, "idle-period=", 12) == 0) ||
1886		    (strncmp(str, "idle_period=", 12) == 0))
1887			idle_period = simple_strtol(str + 12, NULL, 0);
1888		invert = (strncmp(str, "no-", 3) == 0) ||
1889			(strncmp(str, "no_", 3) == 0);
1890		if (invert)
1891			str += 3;
1892		if (strncmp(str, "debug", 5) == 0)
1893			debug = !invert;
1894		if ((strncmp(str, "power-off", 9) == 0) ||
1895		    (strncmp(str, "power_off", 9) == 0))
1896			power_off = !invert;
1897		if (strncmp(str, "smp", 3) == 0) {
1898			smp = !invert;
1899			idle_threshold = 100;
1900		}
1901		if ((strncmp(str, "allow-ints", 10) == 0) ||
1902		    (strncmp(str, "allow_ints", 10) == 0))
1903			apm_info.allow_ints = !invert;
1904		if ((strncmp(str, "broken-psr", 10) == 0) ||
1905		    (strncmp(str, "broken_psr", 10) == 0))
1906			apm_info.get_power_status_broken = !invert;
1907		if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1908		    (strncmp(str, "realmode_power_off", 18) == 0))
1909			apm_info.realmode_power_off = !invert;
1910		str = strchr(str, ',');
1911		if (str != NULL)
1912			str += strspn(str, ", \t");
1913	}
1914	return 1;
1915}
1916
1917__setup("apm=", apm_setup);
1918#endif
1919
1920static const struct file_operations apm_bios_fops = {
1921	.owner		= THIS_MODULE,
1922	.read		= do_read,
1923	.poll		= do_poll,
1924	.unlocked_ioctl	= do_ioctl,
1925	.open		= do_open,
1926	.release	= do_release,
1927	.llseek		= noop_llseek,
1928};
1929
1930static struct miscdevice apm_device = {
1931	APM_MINOR_DEV,
1932	"apm_bios",
1933	&apm_bios_fops
1934};
1935
1936
1937/* Simple "print if true" callback */
1938static int __init print_if_true(const struct dmi_system_id *d)
1939{
1940	printk("%s\n", d->ident);
1941	return 0;
1942}
1943
1944/*
1945 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1946 * disabled before the suspend. Linux used to get terribly confused by that.
1947 */
1948static int __init broken_ps2_resume(const struct dmi_system_id *d)
1949{
1950	printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1951	       "workaround hopefully not needed.\n", d->ident);
1952	return 0;
1953}
1954
1955/* Some bioses have a broken protected mode poweroff and need to use realmode */
1956static int __init set_realmode_power_off(const struct dmi_system_id *d)
1957{
1958	if (apm_info.realmode_power_off == 0) {
1959		apm_info.realmode_power_off = 1;
1960		printk(KERN_INFO "%s bios detected. "
1961		       "Using realmode poweroff only.\n", d->ident);
1962	}
1963	return 0;
1964}
1965
1966/* Some laptops require interrupts to be enabled during APM calls */
1967static int __init set_apm_ints(const struct dmi_system_id *d)
1968{
1969	if (apm_info.allow_ints == 0) {
1970		apm_info.allow_ints = 1;
1971		printk(KERN_INFO "%s machine detected. "
1972		       "Enabling interrupts during APM calls.\n", d->ident);
1973	}
1974	return 0;
1975}
1976
1977/* Some APM bioses corrupt memory or just plain do not work */
1978static int __init apm_is_horked(const struct dmi_system_id *d)
1979{
1980	if (apm_info.disabled == 0) {
1981		apm_info.disabled = 1;
1982		printk(KERN_INFO "%s machine detected. "
1983		       "Disabling APM.\n", d->ident);
1984	}
1985	return 0;
1986}
1987
1988static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1989{
1990	if (apm_info.disabled == 0) {
1991		apm_info.disabled = 1;
1992		printk(KERN_INFO "%s machine detected. "
1993		       "Disabling APM.\n", d->ident);
1994		printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1995		printk(KERN_INFO "download from support.intel.com\n");
1996	}
1997	return 0;
1998}
1999
2000/* Some APM bioses hang on APM idle calls */
2001static int __init apm_likes_to_melt(const struct dmi_system_id *d)
2002{
2003	if (apm_info.forbid_idle == 0) {
2004		apm_info.forbid_idle = 1;
2005		printk(KERN_INFO "%s machine detected. "
2006		       "Disabling APM idle calls.\n", d->ident);
2007	}
2008	return 0;
2009}
2010
2011/*
2012 *  Check for clue free BIOS implementations who use
2013 *  the following QA technique
2014 *
2015 *      [ Write BIOS Code ]<------
2016 *               |                ^
2017 *      < Does it Compile >----N--
2018 *               |Y               ^
2019 *	< Does it Boot Win98 >-N--
2020 *               |Y
2021 *           [Ship It]
2022 *
2023 *	Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
2024 *	Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
2025 */
2026static int __init broken_apm_power(const struct dmi_system_id *d)
2027{
2028	apm_info.get_power_status_broken = 1;
2029	printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2030	       "disabling power status reporting.\n");
2031	return 0;
2032}
2033
2034/*
2035 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2036 * have this problem).
2037 */
2038static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2039{
2040	apm_info.get_power_status_swabinminutes = 1;
2041	printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2042	       "in minutes and wrong byte order.\n");
2043	return 0;
2044}
2045
2046static const struct dmi_system_id apm_dmi_table[] __initconst = {
2047	{
2048		print_if_true,
2049		KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2050		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2051			DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2052	},
2053	{	/* Handle problems with APM on the C600 */
2054		broken_ps2_resume, "Dell Latitude C600",
2055		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2056			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2057	},
2058	{	/* Allow interrupts during suspend on Dell Latitude laptops*/
2059		set_apm_ints, "Dell Latitude",
2060		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2061			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2062	},
2063	{	/* APM crashes */
2064		apm_is_horked, "Dell Inspiron 2500",
2065		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2066			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2067			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2068			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2069	},
2070	{	/* Allow interrupts during suspend on Dell Inspiron laptops*/
2071		set_apm_ints, "Dell Inspiron", {
2072			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2073			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2074	},
2075	{	/* Handle problems with APM on Inspiron 5000e */
2076		broken_apm_power, "Dell Inspiron 5000e",
2077		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2078			DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2079			DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2080	},
2081	{	/* Handle problems with APM on Inspiron 2500 */
2082		broken_apm_power, "Dell Inspiron 2500",
2083		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2084			DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2085			DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2086	},
2087	{	/* APM crashes */
2088		apm_is_horked, "Dell Dimension 4100",
2089		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2090			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2091			DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2092			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2093	},
2094	{	/* Allow interrupts during suspend on Compaq Laptops*/
2095		set_apm_ints, "Compaq 12XL125",
2096		{	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2097			DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2098			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2099			DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2100	},
2101	{	/* Allow interrupts during APM or the clock goes slow */
2102		set_apm_ints, "ASUSTeK",
2103		{	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2104			DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2105	},
2106	{	/* APM blows on shutdown */
2107		apm_is_horked, "ABIT KX7-333[R]",
2108		{	DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2109			DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2110	},
2111	{	/* APM crashes */
2112		apm_is_horked, "Trigem Delhi3",
2113		{	DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2114			DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2115	},
2116	{	/* APM crashes */
2117		apm_is_horked, "Fujitsu-Siemens",
2118		{	DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2119			DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2120	},
2121	{	/* APM crashes */
2122		apm_is_horked_d850md, "Intel D850MD",
2123		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2124			DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2125	},
2126	{	/* APM crashes */
2127		apm_is_horked, "Intel D810EMO",
2128		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2129			DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2130	},
2131	{	/* APM crashes */
2132		apm_is_horked, "Dell XPS-Z",
2133		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2134			DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2135			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2136	},
2137	{	/* APM crashes */
2138		apm_is_horked, "Sharp PC-PJ/AX",
2139		{	DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2140			DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2141			DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2142			DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2143	},
2144	{	/* APM crashes */
2145		apm_is_horked, "Dell Inspiron 2500",
2146		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2147			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2148			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2149			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2150	},
2151	{	/* APM idle hangs */
2152		apm_likes_to_melt, "Jabil AMD",
2153		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2154			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2155	},
2156	{	/* APM idle hangs */
2157		apm_likes_to_melt, "AMI Bios",
2158		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2159			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2160	},
2161	{	/* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2162		swab_apm_power_in_minutes, "Sony VAIO",
2163		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2164			DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2165			DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2166	},
2167	{	/* Handle problems with APM on Sony Vaio PCG-N505VX */
2168		swab_apm_power_in_minutes, "Sony VAIO",
2169		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2170			DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2171			DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2172	},
2173	{	/* Handle problems with APM on Sony Vaio PCG-XG29 */
2174		swab_apm_power_in_minutes, "Sony VAIO",
2175		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2176			DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2177			DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2178	},
2179	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2180		swab_apm_power_in_minutes, "Sony VAIO",
2181		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2182			DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2183			DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2184	},
2185	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2186		swab_apm_power_in_minutes, "Sony VAIO",
2187		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2188			DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2189			DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2190	},
2191	{	/* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2192		swab_apm_power_in_minutes, "Sony VAIO",
2193		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2194			DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2195			DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2196	},
2197	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2198		swab_apm_power_in_minutes, "Sony VAIO",
2199		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2200			DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2201			DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2202	},
2203	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2204		swab_apm_power_in_minutes, "Sony VAIO",
2205		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2206			DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2207			DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2208	},
2209	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2210		swab_apm_power_in_minutes, "Sony VAIO",
2211		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2212			DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2213			DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2214	},
2215	{	/* Handle problems with APM on Sony Vaio PCG-F104K */
2216		swab_apm_power_in_minutes, "Sony VAIO",
2217		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2218			DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2219			DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2220	},
2221
2222	{	/* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2223		swab_apm_power_in_minutes, "Sony VAIO",
2224		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2225			DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2226			DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2227	},
2228	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2229		swab_apm_power_in_minutes, "Sony VAIO",
2230		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2231			DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2232			DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2233	},
2234	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2235		swab_apm_power_in_minutes, "Sony VAIO",
2236		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2237			DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2238			DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2239	},
2240	{	/* broken PM poweroff bios */
2241		set_realmode_power_off, "Award Software v4.60 PGMA",
2242		{	DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2243			DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2244			DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2245	},
2246
2247	/* Generic per vendor APM settings  */
2248
2249	{	/* Allow interrupts during suspend on IBM laptops */
2250		set_apm_ints, "IBM",
2251		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2252	},
2253
2254	{ }
2255};
2256
2257/*
2258 * Just start the APM thread. We do NOT want to do APM BIOS
2259 * calls from anything but the APM thread, if for no other reason
2260 * than the fact that we don't trust the APM BIOS. This way,
2261 * most common APM BIOS problems that lead to protection errors
2262 * etc will have at least some level of being contained...
2263 *
2264 * In short, if something bad happens, at least we have a choice
2265 * of just killing the apm thread..
2266 */
2267static int __init apm_init(void)
2268{
2269	struct desc_struct *gdt;
2270	int err;
2271
2272	dmi_check_system(apm_dmi_table);
2273
2274	if (apm_info.bios.version == 0 || machine_is_olpc()) {
2275		printk(KERN_INFO "apm: BIOS not found.\n");
2276		return -ENODEV;
2277	}
2278	printk(KERN_INFO
2279	       "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2280	       ((apm_info.bios.version >> 8) & 0xff),
2281	       (apm_info.bios.version & 0xff),
2282	       apm_info.bios.flags,
2283	       driver_version);
2284	if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2285		printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2286		return -ENODEV;
2287	}
2288
2289	if (allow_ints)
2290		apm_info.allow_ints = 1;
2291	if (broken_psr)
2292		apm_info.get_power_status_broken = 1;
2293	if (realmode_power_off)
2294		apm_info.realmode_power_off = 1;
2295	/* User can override, but default is to trust DMI */
2296	if (apm_disabled != -1)
2297		apm_info.disabled = apm_disabled;
2298
2299	/*
2300	 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2301	 * but is reportedly a 1.0 BIOS.
2302	 */
2303	if (apm_info.bios.version == 0x001)
2304		apm_info.bios.version = 0x100;
2305
2306	/* BIOS < 1.2 doesn't set cseg_16_len */
2307	if (apm_info.bios.version < 0x102)
2308		apm_info.bios.cseg_16_len = 0; /* 64k */
2309
2310	if (debug) {
2311		printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2312			apm_info.bios.cseg, apm_info.bios.offset,
2313			apm_info.bios.cseg_16, apm_info.bios.dseg);
2314		if (apm_info.bios.version > 0x100)
2315			printk(" cseg len %x, dseg len %x",
2316				apm_info.bios.cseg_len,
2317				apm_info.bios.dseg_len);
2318		if (apm_info.bios.version > 0x101)
2319			printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2320		printk("\n");
2321	}
2322
2323	if (apm_info.disabled) {
2324		pr_notice("disabled on user request.\n");
2325		return -ENODEV;
2326	}
2327	if ((num_online_cpus() > 1) && !power_off && !smp) {
2328		pr_notice("disabled - APM is not SMP safe.\n");
2329		apm_info.disabled = 1;
2330		return -ENODEV;
2331	}
2332	if (!acpi_disabled) {
2333		pr_notice("overridden by ACPI.\n");
2334		apm_info.disabled = 1;
2335		return -ENODEV;
2336	}
2337
2338	/*
2339	 * Set up the long jump entry point to the APM BIOS, which is called
2340	 * from inline assembly.
2341	 */
2342	apm_bios_entry.offset = apm_info.bios.offset;
2343	apm_bios_entry.segment = APM_CS;
2344
2345	/*
2346	 * The APM 1.1 BIOS is supposed to provide limit information that it
2347	 * recognizes.  Many machines do this correctly, but many others do
2348	 * not restrict themselves to their claimed limit.  When this happens,
2349	 * they will cause a segmentation violation in the kernel at boot time.
2350	 * Most BIOS's, however, will respect a 64k limit, so we use that.
2351	 *
2352	 * Note we only set APM segments on CPU zero, since we pin the APM
2353	 * code to that CPU.
2354	 */
2355	gdt = get_cpu_gdt_rw(0);
2356	set_desc_base(&gdt[APM_CS >> 3],
2357		 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2358	set_desc_base(&gdt[APM_CS_16 >> 3],
2359		 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2360	set_desc_base(&gdt[APM_DS >> 3],
2361		 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2362
2363	proc_create("apm", 0, NULL, &apm_file_ops);
2364
2365	kapmd_task = kthread_create(apm, NULL, "kapmd");
2366	if (IS_ERR(kapmd_task)) {
2367		pr_err("disabled - Unable to start kernel thread\n");
 
2368		err = PTR_ERR(kapmd_task);
2369		kapmd_task = NULL;
2370		remove_proc_entry("apm", NULL);
2371		return err;
2372	}
2373	wake_up_process(kapmd_task);
2374
2375	if (num_online_cpus() > 1 && !smp) {
2376		printk(KERN_NOTICE
2377		       "apm: disabled - APM is not SMP safe (power off active).\n");
2378		return 0;
2379	}
2380
2381	/*
2382	 * Note we don't actually care if the misc_device cannot be registered.
2383	 * this driver can do its job without it, even if userspace can't
2384	 * control it.  just log the error
2385	 */
2386	if (misc_register(&apm_device))
2387		printk(KERN_WARNING "apm: Could not register misc device.\n");
2388
2389	if (HZ != 100)
2390		idle_period = (idle_period * HZ) / 100;
2391	if (idle_threshold < 100) {
2392		cpuidle_poll_state_init(&apm_idle_driver);
2393		if (!cpuidle_register_driver(&apm_idle_driver))
2394			if (cpuidle_register_device(&apm_cpuidle_device))
2395				cpuidle_unregister_driver(&apm_idle_driver);
2396	}
2397
2398	return 0;
2399}
2400
2401static void __exit apm_exit(void)
2402{
2403	int error;
2404
2405	cpuidle_unregister_device(&apm_cpuidle_device);
2406	cpuidle_unregister_driver(&apm_idle_driver);
2407
 
 
 
 
 
 
2408	if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2409	    && (apm_info.connection_version > 0x0100)) {
2410		error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2411		if (error)
2412			apm_error("disengage power management", error);
2413	}
2414	misc_deregister(&apm_device);
2415	remove_proc_entry("apm", NULL);
2416	if (power_off)
2417		pm_power_off = NULL;
2418	if (kapmd_task) {
2419		kthread_stop(kapmd_task);
2420		kapmd_task = NULL;
2421	}
2422}
2423
2424module_init(apm_init);
2425module_exit(apm_exit);
2426
2427MODULE_AUTHOR("Stephen Rothwell");
2428MODULE_DESCRIPTION("Advanced Power Management");
2429MODULE_LICENSE("GPL");
2430module_param(debug, bool, 0644);
2431MODULE_PARM_DESC(debug, "Enable debug mode");
2432module_param(power_off, bool, 0444);
2433MODULE_PARM_DESC(power_off, "Enable power off");
2434module_param(bounce_interval, int, 0444);
2435MODULE_PARM_DESC(bounce_interval,
2436		"Set the number of ticks to ignore suspend bounces");
2437module_param(allow_ints, bool, 0444);
2438MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2439module_param(broken_psr, bool, 0444);
2440MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2441module_param(realmode_power_off, bool, 0444);
2442MODULE_PARM_DESC(realmode_power_off,
2443		"Switch to real mode before powering off");
2444module_param(idle_threshold, int, 0444);
2445MODULE_PARM_DESC(idle_threshold,
2446	"System idle percentage above which to make APM BIOS idle calls");
2447module_param(idle_period, int, 0444);
2448MODULE_PARM_DESC(idle_period,
2449	"Period (in sec/100) over which to caculate the idle percentage");
2450module_param(smp, bool, 0444);
2451MODULE_PARM_DESC(smp,
2452	"Set this to enable APM use on an SMP platform. Use with caution on older systems");
2453MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
v3.1
   1/* -*- linux-c -*-
   2 * APM BIOS driver for Linux
   3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
   4 *
   5 * Initial development of this driver was funded by NEC Australia P/L
   6 *	and NEC Corporation
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under the terms of the GNU General Public License as published by the
  10 * Free Software Foundation; either version 2, or (at your option) any
  11 * later version.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * October 1995, Rik Faith (faith@cs.unc.edu):
  19 *    Minor enhancements and updates (to the patch set) for 1.3.x
  20 *    Documentation
  21 * January 1996, Rik Faith (faith@cs.unc.edu):
  22 *    Make /proc/apm easy to format (bump driver version)
  23 * March 1996, Rik Faith (faith@cs.unc.edu):
  24 *    Prohibit APM BIOS calls unless apm_enabled.
  25 *    (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
  26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
  27 *    Version 1.0 and 1.1
  28 * May 1996, Version 1.2
  29 * Feb 1998, Version 1.3
  30 * Feb 1998, Version 1.4
  31 * Aug 1998, Version 1.5
  32 * Sep 1998, Version 1.6
  33 * Nov 1998, Version 1.7
  34 * Jan 1999, Version 1.8
  35 * Jan 1999, Version 1.9
  36 * Oct 1999, Version 1.10
  37 * Nov 1999, Version 1.11
  38 * Jan 2000, Version 1.12
  39 * Feb 2000, Version 1.13
  40 * Nov 2000, Version 1.14
  41 * Oct 2001, Version 1.15
  42 * Jan 2002, Version 1.16
  43 * Oct 2002, Version 1.16ac
  44 *
  45 * History:
  46 *    0.6b: first version in official kernel, Linux 1.3.46
  47 *    0.7: changed /proc/apm format, Linux 1.3.58
  48 *    0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
  49 *    0.9: only call bios if bios is present, Linux 1.3.72
  50 *    1.0: use fixed device number, consolidate /proc/apm into this file,
  51 *         Linux 1.3.85
  52 *    1.1: support user-space standby and suspend, power off after system
  53 *         halted, Linux 1.3.98
  54 *    1.2: When resetting RTC after resume, take care so that the time
  55 *         is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
  56 *         <jtoth@princeton.edu>); improve interaction between
  57 *         screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
  58 *    1.2a:Simple change to stop mysterious bug reports with SMP also added
  59 *	   levels to the printk calls. APM is not defined for SMP machines.
  60 *         The new replacement for it is, but Linux doesn't yet support this.
  61 *         Alan Cox Linux 2.1.55
  62 *    1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
  63 *    1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
  64 *         Dean Gaudet <dgaudet@arctic.org>.
  65 *         C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
  66 *    1.5: Fix segment register reloading (in case of bad segments saved
  67 *         across BIOS call).
  68 *         Stephen Rothwell
  69 *    1.6: Cope with compiler/assembler differences.
  70 *         Only try to turn off the first display device.
  71 *         Fix OOPS at power off with no APM BIOS by Jan Echternach
  72 *                   <echter@informatik.uni-rostock.de>
  73 *         Stephen Rothwell
  74 *    1.7: Modify driver's cached copy of the disabled/disengaged flags
  75 *         to reflect current state of APM BIOS.
  76 *         Chris Rankin <rankinc@bellsouth.net>
  77 *         Reset interrupt 0 timer to 100Hz after suspend
  78 *         Chad Miller <cmiller@surfsouth.com>
  79 *         Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
  80 *         Richard Gooch <rgooch@atnf.csiro.au>
  81 *         Allow boot time disabling of APM
  82 *         Make boot messages far less verbose by default
  83 *         Make asm safer
  84 *         Stephen Rothwell
  85 *    1.8: Add CONFIG_APM_RTC_IS_GMT
  86 *         Richard Gooch <rgooch@atnf.csiro.au>
  87 *         change APM_NOINTS to CONFIG_APM_ALLOW_INTS
  88 *         remove dependency on CONFIG_PROC_FS
  89 *         Stephen Rothwell
  90 *    1.9: Fix small typo.  <laslo@wodip.opole.pl>
  91 *         Try to cope with BIOS's that need to have all display
  92 *         devices blanked and not just the first one.
  93 *         Ross Paterson <ross@soi.city.ac.uk>
  94 *         Fix segment limit setting it has always been wrong as
  95 *         the segments needed to have byte granularity.
  96 *         Mark a few things __init.
  97 *         Add hack to allow power off of SMP systems by popular request.
  98 *         Use CONFIG_SMP instead of __SMP__
  99 *         Ignore BOUNCES for three seconds.
 100 *         Stephen Rothwell
 101 *   1.10: Fix for Thinkpad return code.
 102 *         Merge 2.2 and 2.3 drivers.
 103 *         Remove APM dependencies in arch/i386/kernel/process.c
 104 *         Remove APM dependencies in drivers/char/sysrq.c
 105 *         Reset time across standby.
 106 *         Allow more inititialisation on SMP.
 107 *         Remove CONFIG_APM_POWER_OFF and make it boot time
 108 *         configurable (default on).
 109 *         Make debug only a boot time parameter (remove APM_DEBUG).
 110 *         Try to blank all devices on any error.
 111 *   1.11: Remove APM dependencies in drivers/char/console.c
 112 *         Check nr_running to detect if we are idle (from
 113 *         Borislav Deianov <borislav@lix.polytechnique.fr>)
 114 *         Fix for bioses that don't zero the top part of the
 115 *         entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
 116 *         (reported by Panos Katsaloulis <teras@writeme.com>).
 117 *         Real mode power off patch (Walter Hofmann
 118 *         <Walter.Hofmann@physik.stud.uni-erlangen.de>).
 119 *   1.12: Remove CONFIG_SMP as the compiler will optimize
 120 *         the code away anyway (smp_num_cpus == 1 in UP)
 121 *         noted by Artur Skawina <skawina@geocities.com>.
 122 *         Make power off under SMP work again.
 123 *         Fix thinko with initial engaging of BIOS.
 124 *         Make sure power off only happens on CPU 0
 125 *         (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
 126 *         Do error notification to user mode if BIOS calls fail.
 127 *         Move entrypoint offset fix to ...boot/setup.S
 128 *         where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
 129 *         Remove smp-power-off. SMP users must now specify
 130 *         "apm=power-off" on the kernel command line. Suggested
 131 *         by Jim Avera <jima@hal.com>, modified by Alan Cox
 132 *         <alan@lxorguk.ukuu.org.uk>.
 133 *         Register the /proc/apm entry even on SMP so that
 134 *         scripts that check for it before doing power off
 135 *         work (Jim Avera <jima@hal.com>).
 136 *   1.13: Changes for new pm_ interfaces (Andy Henroid
 137 *         <andy_henroid@yahoo.com>).
 138 *         Modularize the code.
 139 *         Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
 140 *         is now the way life works).
 141 *         Fix thinko in suspend() (wrong return).
 142 *         Notify drivers on critical suspend.
 143 *         Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz>
 144 *         modified by sfr).
 145 *         Disable interrupts while we are suspended (Andy Henroid
 146 *         <andy_henroid@yahoo.com> fixed by sfr).
 147 *         Make power off work on SMP again (Tony Hoyle
 148 *         <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
 149 *         Remove CONFIG_APM_SUSPEND_BOUNCE.  The bounce ignore
 150 *         interval is now configurable.
 151 *   1.14: Make connection version persist across module unload/load.
 152 *         Enable and engage power management earlier.
 153 *         Disengage power management on module unload.
 154 *         Changed to use the sysrq-register hack for registering the
 155 *         power off function called by magic sysrq based upon discussions
 156 *         in irc://irc.openprojects.net/#kernelnewbies
 157 *         (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
 158 *         Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
 159 *         (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
 160 *         Work around byte swap bug in one of the Vaio's BIOS's
 161 *         (Marc Boucher <marc@mbsi.ca>).
 162 *         Exposed the disable flag to dmi so that we can handle known
 163 *         broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>).
 164 *   1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
 165 *         calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
 166 *         If an APM idle fails log it and idle sensibly
 167 *   1.15: Don't queue events to clients who open the device O_WRONLY.
 168 *         Don't expect replies from clients who open the device O_RDONLY.
 169 *         (Idea from Thomas Hood)
 170 *         Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
 171 *   1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
 172 *         Notify listeners of standby or suspend events before notifying
 173 *         drivers. Return EBUSY to ioctl() if suspend is rejected.
 174 *         (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
 175 *         Ignore first resume after we generate our own resume event
 176 *         after a suspend (Thomas Hood)
 177 *         Daemonize now gets rid of our controlling terminal (sfr).
 178 *         CONFIG_APM_CPU_IDLE now just affects the default value of
 179 *         idle_threshold (sfr).
 180 *         Change name of kernel apm daemon (as it no longer idles) (sfr).
 181 *   1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
 182 *	   make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
 183 *	   TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
 184 *
 185 * APM 1.1 Reference:
 186 *
 187 *   Intel Corporation, Microsoft Corporation. Advanced Power Management
 188 *   (APM) BIOS Interface Specification, Revision 1.1, September 1993.
 189 *   Intel Order Number 241704-001.  Microsoft Part Number 781-110-X01.
 190 *
 191 * [This document is available free from Intel by calling 800.628.8686 (fax
 192 * 916.356.6100) or 800.548.4725; or from
 193 * http://www.microsoft.com/whdc/archive/amp_12.mspx  It is also
 194 * available from Microsoft by calling 206.882.8080.]
 195 *
 196 * APM 1.2 Reference:
 197 *   Intel Corporation, Microsoft Corporation. Advanced Power Management
 198 *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
 199 *
 200 * [This document is available from Microsoft at:
 201 *    http://www.microsoft.com/whdc/archive/amp_12.mspx]
 202 */
 203
 
 
 204#include <linux/module.h>
 205
 206#include <linux/poll.h>
 207#include <linux/types.h>
 208#include <linux/stddef.h>
 209#include <linux/timer.h>
 210#include <linux/fcntl.h>
 211#include <linux/slab.h>
 212#include <linux/stat.h>
 213#include <linux/proc_fs.h>
 214#include <linux/seq_file.h>
 215#include <linux/miscdevice.h>
 216#include <linux/apm_bios.h>
 217#include <linux/init.h>
 218#include <linux/time.h>
 219#include <linux/sched.h>
 
 220#include <linux/pm.h>
 221#include <linux/capability.h>
 222#include <linux/device.h>
 223#include <linux/kernel.h>
 224#include <linux/freezer.h>
 225#include <linux/smp.h>
 226#include <linux/dmi.h>
 227#include <linux/suspend.h>
 228#include <linux/kthread.h>
 229#include <linux/jiffies.h>
 230#include <linux/acpi.h>
 231#include <linux/syscore_ops.h>
 232#include <linux/i8253.h>
 
 233
 234#include <asm/system.h>
 235#include <asm/uaccess.h>
 236#include <asm/desc.h>
 237#include <asm/olpc.h>
 238#include <asm/paravirt.h>
 239#include <asm/reboot.h>
 240
 241#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
 242extern int (*console_blank_hook)(int);
 243#endif
 244
 245/*
 246 * The apm_bios device is one of the misc char devices.
 247 * This is its minor number.
 248 */
 249#define	APM_MINOR_DEV	134
 250
 251/*
 252 * See Documentation/Config.help for the configuration options.
 253 *
 254 * Various options can be changed at boot time as follows:
 255 * (We allow underscores for compatibility with the modules code)
 256 *	apm=on/off			enable/disable APM
 257 *	    [no-]allow[-_]ints		allow interrupts during BIOS calls
 258 *	    [no-]broken[-_]psr		BIOS has a broken GetPowerStatus call
 259 *	    [no-]realmode[-_]power[-_]off	switch to real mode before
 260 *	    					powering off
 261 *	    [no-]debug			log some debugging messages
 262 *	    [no-]power[-_]off		power off on shutdown
 263 *	    [no-]smp			Use apm even on an SMP box
 264 *	    bounce[-_]interval=<n>	number of ticks to ignore suspend
 265 *	    				bounces
 266 *          idle[-_]threshold=<n>       System idle percentage above which to
 267 *                                      make APM BIOS idle calls. Set it to
 268 *                                      100 to disable.
 269 *          idle[-_]period=<n>          Period (in 1/100s of a second) over
 270 *                                      which the idle percentage is
 271 *                                      calculated.
 272 */
 273
 274/* KNOWN PROBLEM MACHINES:
 275 *
 276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
 277 *                         [Confirmed by TI representative]
 278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
 279 *                    [Confirmed by BIOS disassembly]
 280 *                    [This may work now ...]
 281 * P: Toshiba 1950S: battery life information only gets updated after resume
 282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
 283 * 	broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
 284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
 285 * 	Neale Banks <neale@lowendale.com.au> December 2000
 286 *
 287 * Legend: U = unusable with APM patches
 288 *         P = partially usable with APM patches
 289 */
 290
 291/*
 292 * Define as 1 to make the driver always call the APM BIOS busy
 293 * routine even if the clock was not reported as slowed by the
 294 * idle routine.  Otherwise, define as 0.
 295 */
 296#define ALWAYS_CALL_BUSY   1
 297
 298/*
 299 * Define to make the APM BIOS calls zero all data segment registers (so
 300 * that an incorrect BIOS implementation will cause a kernel panic if it
 301 * tries to write to arbitrary memory).
 302 */
 303#define APM_ZERO_SEGS
 304
 305#include <asm/apm.h>
 306
 307/*
 308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
 309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
 310 * David Chen <chen@ctpa04.mit.edu>
 311 */
 312#undef INIT_TIMER_AFTER_SUSPEND
 313
 314#ifdef INIT_TIMER_AFTER_SUSPEND
 315#include <linux/timex.h>
 316#include <asm/io.h>
 317#include <linux/delay.h>
 318#endif
 319
 320/*
 321 * Need to poll the APM BIOS every second
 322 */
 323#define APM_CHECK_TIMEOUT	(HZ)
 324
 325/*
 326 * Ignore suspend events for this amount of time after a resume
 327 */
 328#define DEFAULT_BOUNCE_INTERVAL	(3 * HZ)
 329
 330/*
 331 * Maximum number of events stored
 332 */
 333#define APM_MAX_EVENTS		20
 334
 335/*
 336 * The per-file APM data
 337 */
 338struct apm_user {
 339	int		magic;
 340	struct apm_user *next;
 341	unsigned int	suser: 1;
 342	unsigned int	writer: 1;
 343	unsigned int	reader: 1;
 344	unsigned int	suspend_wait: 1;
 345	int		suspend_result;
 346	int		suspends_pending;
 347	int		standbys_pending;
 348	int		suspends_read;
 349	int		standbys_read;
 350	int		event_head;
 351	int		event_tail;
 352	apm_event_t	events[APM_MAX_EVENTS];
 353};
 354
 355/*
 356 * The magic number in apm_user
 357 */
 358#define APM_BIOS_MAGIC		0x4101
 359
 360/*
 361 * idle percentage above which bios idle calls are done
 362 */
 363#ifdef CONFIG_APM_CPU_IDLE
 364#warning deprecated CONFIG_APM_CPU_IDLE will be deleted in 2012
 365#define DEFAULT_IDLE_THRESHOLD	95
 366#else
 367#define DEFAULT_IDLE_THRESHOLD	100
 368#endif
 369#define DEFAULT_IDLE_PERIOD	(100 / 3)
 370
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 371/*
 372 * Local variables
 373 */
 374static struct {
 375	unsigned long	offset;
 376	unsigned short	segment;
 377} apm_bios_entry;
 378static int clock_slowed;
 379static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
 380static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
 381static int set_pm_idle;
 382static int suspends_pending;
 383static int standbys_pending;
 384static int ignore_sys_suspend;
 385static int ignore_normal_resume;
 386static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
 387
 388static int debug __read_mostly;
 389static int smp __read_mostly;
 390static int apm_disabled = -1;
 391#ifdef CONFIG_SMP
 392static int power_off;
 393#else
 394static int power_off = 1;
 395#endif
 396static int realmode_power_off;
 397#ifdef CONFIG_APM_ALLOW_INTS
 398static int allow_ints = 1;
 399#else
 400static int allow_ints;
 401#endif
 402static int broken_psr;
 403
 404static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
 405static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
 406static struct apm_user *user_list;
 407static DEFINE_SPINLOCK(user_list_lock);
 408static DEFINE_MUTEX(apm_mutex);
 409
 410/*
 411 * Set up a segment that references the real mode segment 0x40
 412 * that extends up to the end of page zero (that we have reserved).
 413 * This is for buggy BIOS's that refer to (real mode) segment 0x40
 414 * even though they are called in protected mode.
 415 */
 416static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
 417			(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
 418
 419static const char driver_version[] = "1.16ac";	/* no spaces */
 420
 421static struct task_struct *kapmd_task;
 422
 423/*
 424 *	APM event names taken from the APM 1.2 specification. These are
 425 *	the message codes that the BIOS uses to tell us about events
 426 */
 427static const char * const apm_event_name[] = {
 428	"system standby",
 429	"system suspend",
 430	"normal resume",
 431	"critical resume",
 432	"low battery",
 433	"power status change",
 434	"update time",
 435	"critical suspend",
 436	"user standby",
 437	"user suspend",
 438	"system standby resume",
 439	"capabilities change"
 440};
 441#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
 442
 443typedef struct lookup_t {
 444	int	key;
 445	char 	*msg;
 446} lookup_t;
 447
 448/*
 449 *	The BIOS returns a set of standard error codes in AX when the
 450 *	carry flag is set.
 451 */
 452
 453static const lookup_t error_table[] = {
 454/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
 455	{ APM_DISABLED,		"Power management disabled" },
 456	{ APM_CONNECTED,	"Real mode interface already connected" },
 457	{ APM_NOT_CONNECTED,	"Interface not connected" },
 458	{ APM_16_CONNECTED,	"16 bit interface already connected" },
 459/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
 460	{ APM_32_CONNECTED,	"32 bit interface already connected" },
 461	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
 462	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
 463	{ APM_BAD_PARAM,	"Parameter out of range" },
 464	{ APM_NOT_ENGAGED,	"Interface not engaged" },
 465	{ APM_BAD_FUNCTION,     "Function not supported" },
 466	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
 467	{ APM_BAD_STATE,	"Unable to enter requested state" },
 468/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
 469	{ APM_NO_ERROR,		"BIOS did not set a return code" },
 470	{ APM_NOT_PRESENT,	"No APM present" }
 471};
 472#define ERROR_COUNT	ARRAY_SIZE(error_table)
 473
 474/**
 475 *	apm_error	-	display an APM error
 476 *	@str: information string
 477 *	@err: APM BIOS return code
 478 *
 479 *	Write a meaningful log entry to the kernel log in the event of
 480 *	an APM error.  Note that this also handles (negative) kernel errors.
 481 */
 482
 483static void apm_error(char *str, int err)
 484{
 485	int i;
 486
 487	for (i = 0; i < ERROR_COUNT; i++)
 488		if (error_table[i].key == err)
 489			break;
 490	if (i < ERROR_COUNT)
 491		printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
 492	else if (err < 0)
 493		printk(KERN_NOTICE "apm: %s: linux error code %i\n", str, err);
 494	else
 495		printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
 496		       str, err);
 497}
 498
 499/*
 500 * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
 501 * apm_info.allow_ints, we are being really paranoid here!  Not only
 502 * are interrupts disabled, but all the segment registers (except SS)
 503 * are saved and zeroed this means that if the BIOS tries to reference
 504 * any data without explicitly loading the segment registers, the kernel
 505 * will fault immediately rather than have some unforeseen circumstances
 506 * for the rest of the kernel.  And it will be very obvious!  :-) Doing
 507 * this depends on CS referring to the same physical memory as DS so that
 508 * DS can be zeroed before the call. Unfortunately, we can't do anything
 509 * about the stack segment/pointer.  Also, we tell the compiler that
 510 * everything could change.
 511 *
 512 * Also, we KNOW that for the non error case of apm_bios_call, there
 513 * is no useful data returned in the low order 8 bits of eax.
 514 */
 515
 516static inline unsigned long __apm_irq_save(void)
 517{
 518	unsigned long flags;
 519	local_save_flags(flags);
 520	if (apm_info.allow_ints) {
 521		if (irqs_disabled_flags(flags))
 522			local_irq_enable();
 523	} else
 524		local_irq_disable();
 525
 526	return flags;
 527}
 528
 529#define apm_irq_save(flags) \
 530	do { flags = __apm_irq_save(); } while (0)
 531
 532static inline void apm_irq_restore(unsigned long flags)
 533{
 534	if (irqs_disabled_flags(flags))
 535		local_irq_disable();
 536	else if (irqs_disabled())
 537		local_irq_enable();
 538}
 539
 540#ifdef APM_ZERO_SEGS
 541#	define APM_DECL_SEGS \
 542		unsigned int saved_fs; unsigned int saved_gs;
 543#	define APM_DO_SAVE_SEGS \
 544		savesegment(fs, saved_fs); savesegment(gs, saved_gs)
 545#	define APM_DO_RESTORE_SEGS \
 546		loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
 547#else
 548#	define APM_DECL_SEGS
 549#	define APM_DO_SAVE_SEGS
 550#	define APM_DO_RESTORE_SEGS
 551#endif
 552
 553struct apm_bios_call {
 554	u32 func;
 555	/* In and out */
 556	u32 ebx;
 557	u32 ecx;
 558	/* Out only */
 559	u32 eax;
 560	u32 edx;
 561	u32 esi;
 562
 563	/* Error: -ENOMEM, or bits 8-15 of eax */
 564	int err;
 565};
 566
 567/**
 568 *	__apm_bios_call - Make an APM BIOS 32bit call
 569 *	@_call: pointer to struct apm_bios_call.
 570 *
 571 *	Make an APM call using the 32bit protected mode interface. The
 572 *	caller is responsible for knowing if APM BIOS is configured and
 573 *	enabled. This call can disable interrupts for a long period of
 574 *	time on some laptops.  The return value is in AH and the carry
 575 *	flag is loaded into AL.  If there is an error, then the error
 576 *	code is returned in AH (bits 8-15 of eax) and this function
 577 *	returns non-zero.
 578 *
 579 *	Note: this makes the call on the current CPU.
 580 */
 581static long __apm_bios_call(void *_call)
 582{
 583	APM_DECL_SEGS
 584	unsigned long		flags;
 585	int			cpu;
 586	struct desc_struct	save_desc_40;
 587	struct desc_struct	*gdt;
 588	struct apm_bios_call	*call = _call;
 589
 590	cpu = get_cpu();
 591	BUG_ON(cpu != 0);
 592	gdt = get_cpu_gdt_table(cpu);
 593	save_desc_40 = gdt[0x40 / 8];
 594	gdt[0x40 / 8] = bad_bios_desc;
 595
 596	apm_irq_save(flags);
 597	APM_DO_SAVE_SEGS;
 598	apm_bios_call_asm(call->func, call->ebx, call->ecx,
 599			  &call->eax, &call->ebx, &call->ecx, &call->edx,
 600			  &call->esi);
 601	APM_DO_RESTORE_SEGS;
 602	apm_irq_restore(flags);
 603	gdt[0x40 / 8] = save_desc_40;
 604	put_cpu();
 605
 606	return call->eax & 0xff;
 607}
 608
 609/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
 610static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
 611{
 612	int ret;
 613
 614	/* Don't bother with work_on_cpu in the common case, so we don't
 615	 * have to worry about OOM or overhead. */
 616	if (get_cpu() == 0) {
 617		ret = fn(call);
 618		put_cpu();
 619	} else {
 620		put_cpu();
 621		ret = work_on_cpu(0, fn, call);
 622	}
 623
 624	/* work_on_cpu can fail with -ENOMEM */
 625	if (ret < 0)
 626		call->err = ret;
 627	else
 628		call->err = (call->eax >> 8) & 0xff;
 629
 630	return ret;
 631}
 632
 633/**
 634 *	apm_bios_call	-	Make an APM BIOS 32bit call (on CPU 0)
 635 *	@call: the apm_bios_call registers.
 636 *
 637 *	If there is an error, it is returned in @call.err.
 638 */
 639static int apm_bios_call(struct apm_bios_call *call)
 640{
 641	return on_cpu0(__apm_bios_call, call);
 642}
 643
 644/**
 645 *	__apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
 646 *	@_call: pointer to struct apm_bios_call.
 647 *
 648 *	Make a BIOS call that returns one value only, or just status.
 649 *	If there is an error, then the error code is returned in AH
 650 *	(bits 8-15 of eax) and this function returns non-zero (it can
 651 *	also return -ENOMEM). This is used for simpler BIOS operations.
 652 *	This call may hold interrupts off for a long time on some laptops.
 653 *
 654 *	Note: this makes the call on the current CPU.
 655 */
 656static long __apm_bios_call_simple(void *_call)
 657{
 658	u8			error;
 659	APM_DECL_SEGS
 660	unsigned long		flags;
 661	int			cpu;
 662	struct desc_struct	save_desc_40;
 663	struct desc_struct	*gdt;
 664	struct apm_bios_call	*call = _call;
 665
 666	cpu = get_cpu();
 667	BUG_ON(cpu != 0);
 668	gdt = get_cpu_gdt_table(cpu);
 669	save_desc_40 = gdt[0x40 / 8];
 670	gdt[0x40 / 8] = bad_bios_desc;
 671
 672	apm_irq_save(flags);
 673	APM_DO_SAVE_SEGS;
 674	error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
 675					 &call->eax);
 676	APM_DO_RESTORE_SEGS;
 677	apm_irq_restore(flags);
 678	gdt[0x40 / 8] = save_desc_40;
 679	put_cpu();
 680	return error;
 681}
 682
 683/**
 684 *	apm_bios_call_simple	-	make a simple APM BIOS 32bit call
 685 *	@func: APM function to invoke
 686 *	@ebx_in: EBX register value for BIOS call
 687 *	@ecx_in: ECX register value for BIOS call
 688 *	@eax: EAX register on return from the BIOS call
 689 *	@err: bits
 690 *
 691 *	Make a BIOS call that returns one value only, or just status.
 692 *	If there is an error, then the error code is returned in @err
 693 *	and this function returns non-zero. This is used for simpler
 694 *	BIOS operations.  This call may hold interrupts off for a long
 695 *	time on some laptops.
 696 */
 697static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
 698				int *err)
 699{
 700	struct apm_bios_call call;
 701	int ret;
 702
 703	call.func = func;
 704	call.ebx = ebx_in;
 705	call.ecx = ecx_in;
 706
 707	ret = on_cpu0(__apm_bios_call_simple, &call);
 708	*eax = call.eax;
 709	*err = call.err;
 710	return ret;
 711}
 712
 713/**
 714 *	apm_driver_version	-	APM driver version
 715 *	@val:	loaded with the APM version on return
 716 *
 717 *	Retrieve the APM version supported by the BIOS. This is only
 718 *	supported for APM 1.1 or higher. An error indicates APM 1.0 is
 719 *	probably present.
 720 *
 721 *	On entry val should point to a value indicating the APM driver
 722 *	version with the high byte being the major and the low byte the
 723 *	minor number both in BCD
 724 *
 725 *	On return it will hold the BIOS revision supported in the
 726 *	same format.
 727 */
 728
 729static int apm_driver_version(u_short *val)
 730{
 731	u32 eax;
 732	int err;
 733
 734	if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
 735		return err;
 736	*val = eax;
 737	return APM_SUCCESS;
 738}
 739
 740/**
 741 *	apm_get_event	-	get an APM event from the BIOS
 742 *	@event: pointer to the event
 743 *	@info: point to the event information
 744 *
 745 *	The APM BIOS provides a polled information for event
 746 *	reporting. The BIOS expects to be polled at least every second
 747 *	when events are pending. When a message is found the caller should
 748 *	poll until no more messages are present.  However, this causes
 749 *	problems on some laptops where a suspend event notification is
 750 *	not cleared until it is acknowledged.
 751 *
 752 *	Additional information is returned in the info pointer, providing
 753 *	that APM 1.2 is in use. If no messges are pending the value 0x80
 754 *	is returned (No power management events pending).
 755 */
 756static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
 757{
 758	struct apm_bios_call call;
 759
 760	call.func = APM_FUNC_GET_EVENT;
 761	call.ebx = call.ecx = 0;
 762
 763	if (apm_bios_call(&call))
 764		return call.err;
 765
 766	*event = call.ebx;
 767	if (apm_info.connection_version < 0x0102)
 768		*info = ~0; /* indicate info not valid */
 769	else
 770		*info = call.ecx;
 771	return APM_SUCCESS;
 772}
 773
 774/**
 775 *	set_power_state	-	set the power management state
 776 *	@what: which items to transition
 777 *	@state: state to transition to
 778 *
 779 *	Request an APM change of state for one or more system devices. The
 780 *	processor state must be transitioned last of all. what holds the
 781 *	class of device in the upper byte and the device number (0xFF for
 782 *	all) for the object to be transitioned.
 783 *
 784 *	The state holds the state to transition to, which may in fact
 785 *	be an acceptance of a BIOS requested state change.
 786 */
 787
 788static int set_power_state(u_short what, u_short state)
 789{
 790	u32 eax;
 791	int err;
 792
 793	if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
 794		return err;
 795	return APM_SUCCESS;
 796}
 797
 798/**
 799 *	set_system_power_state - set system wide power state
 800 *	@state: which state to enter
 801 *
 802 *	Transition the entire system into a new APM power state.
 803 */
 804
 805static int set_system_power_state(u_short state)
 806{
 807	return set_power_state(APM_DEVICE_ALL, state);
 808}
 809
 810/**
 811 *	apm_do_idle	-	perform power saving
 812 *
 813 *	This function notifies the BIOS that the processor is (in the view
 814 *	of the OS) idle. It returns -1 in the event that the BIOS refuses
 815 *	to handle the idle request. On a success the function returns 1
 816 *	if the BIOS did clock slowing or 0 otherwise.
 817 */
 818
 819static int apm_do_idle(void)
 820{
 821	u32 eax;
 822	u8 ret = 0;
 823	int idled = 0;
 824	int polling;
 825	int err = 0;
 826
 827	polling = !!(current_thread_info()->status & TS_POLLING);
 828	if (polling) {
 829		current_thread_info()->status &= ~TS_POLLING;
 830		/*
 831		 * TS_POLLING-cleared state must be visible before we
 832		 * test NEED_RESCHED:
 833		 */
 834		smp_mb();
 835	}
 836	if (!need_resched()) {
 837		idled = 1;
 838		ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
 839	}
 840	if (polling)
 841		current_thread_info()->status |= TS_POLLING;
 842
 843	if (!idled)
 844		return 0;
 845
 846	if (ret) {
 847		static unsigned long t;
 848
 849		/* This always fails on some SMP boards running UP kernels.
 850		 * Only report the failure the first 5 times.
 851		 */
 852		if (++t < 5) {
 853			printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
 854			t = jiffies;
 855		}
 856		return -1;
 857	}
 858	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
 859	return clock_slowed;
 860}
 861
 862/**
 863 *	apm_do_busy	-	inform the BIOS the CPU is busy
 864 *
 865 *	Request that the BIOS brings the CPU back to full performance.
 866 */
 867
 868static void apm_do_busy(void)
 869{
 870	u32 dummy;
 871	int err;
 872
 873	if (clock_slowed || ALWAYS_CALL_BUSY) {
 874		(void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
 875		clock_slowed = 0;
 876	}
 877}
 878
 879/*
 880 * If no process has really been interested in
 881 * the CPU for some time, we want to call BIOS
 882 * power management - we probably want
 883 * to conserve power.
 884 */
 885#define IDLE_CALC_LIMIT	(HZ * 100)
 886#define IDLE_LEAKY_MAX	16
 887
 888static void (*original_pm_idle)(void) __read_mostly;
 889
 890/**
 891 * apm_cpu_idle		-	cpu idling for APM capable Linux
 892 *
 893 * This is the idling function the kernel executes when APM is available. It
 894 * tries to do BIOS powermanagement based on the average system idle time.
 895 * Furthermore it calls the system default idle routine.
 896 */
 897
 898static void apm_cpu_idle(void)
 
 899{
 900	static int use_apm_idle; /* = 0 */
 901	static unsigned int last_jiffies; /* = 0 */
 902	static unsigned int last_stime; /* = 0 */
 
 903
 904	int apm_idle_done = 0;
 905	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
 906	unsigned int bucket;
 907
 908	WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2012");
 909recalc:
 
 910	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
 911		use_apm_idle = 0;
 912		last_jiffies = jiffies;
 913		last_stime = current->stime;
 914	} else if (jiffies_since_last_check > idle_period) {
 915		unsigned int idle_percentage;
 916
 917		idle_percentage = current->stime - last_stime;
 918		idle_percentage *= 100;
 919		idle_percentage /= jiffies_since_last_check;
 920		use_apm_idle = (idle_percentage > idle_threshold);
 921		if (apm_info.forbid_idle)
 922			use_apm_idle = 0;
 923		last_jiffies = jiffies;
 924		last_stime = current->stime;
 925	}
 926
 
 
 
 927	bucket = IDLE_LEAKY_MAX;
 928
 929	while (!need_resched()) {
 930		if (use_apm_idle) {
 931			unsigned int t;
 932
 933			t = jiffies;
 934			switch (apm_do_idle()) {
 935			case 0:
 936				apm_idle_done = 1;
 937				if (t != jiffies) {
 938					if (bucket) {
 939						bucket = IDLE_LEAKY_MAX;
 940						continue;
 941					}
 942				} else if (bucket) {
 943					bucket--;
 944					continue;
 945				}
 946				break;
 947			case 1:
 948				apm_idle_done = 1;
 949				break;
 950			default: /* BIOS refused */
 951				break;
 952			}
 953		}
 954		if (original_pm_idle)
 955			original_pm_idle();
 956		else
 957			default_idle();
 958		local_irq_disable();
 959		jiffies_since_last_check = jiffies - last_jiffies;
 960		if (jiffies_since_last_check > idle_period)
 961			goto recalc;
 962	}
 963
 964	if (apm_idle_done)
 965		apm_do_busy();
 966
 967	local_irq_enable();
 968}
 969
 970/**
 971 *	apm_power_off	-	ask the BIOS to power off
 972 *
 973 *	Handle the power off sequence. This is the one piece of code we
 974 *	will execute even on SMP machines. In order to deal with BIOS
 975 *	bugs we support real mode APM BIOS power off calls. We also make
 976 *	the SMP call on CPU0 as some systems will only honour this call
 977 *	on their first cpu.
 978 */
 979
 980static void apm_power_off(void)
 981{
 982	/* Some bioses don't like being called from CPU != 0 */
 983	if (apm_info.realmode_power_off) {
 984		set_cpus_allowed_ptr(current, cpumask_of(0));
 985		machine_real_restart(MRR_APM);
 986	} else {
 987		(void)set_system_power_state(APM_STATE_OFF);
 988	}
 989}
 990
 991#ifdef CONFIG_APM_DO_ENABLE
 992
 993/**
 994 *	apm_enable_power_management - enable BIOS APM power management
 995 *	@enable: enable yes/no
 996 *
 997 *	Enable or disable the APM BIOS power services.
 998 */
 999
1000static int apm_enable_power_management(int enable)
1001{
1002	u32 eax;
1003	int err;
1004
1005	if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1006		return APM_NOT_ENGAGED;
1007	if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1008				 enable, &eax, &err))
1009		return err;
1010	if (enable)
1011		apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1012	else
1013		apm_info.bios.flags |= APM_BIOS_DISABLED;
1014	return APM_SUCCESS;
1015}
1016#endif
1017
1018/**
1019 *	apm_get_power_status	-	get current power state
1020 *	@status: returned status
1021 *	@bat: battery info
1022 *	@life: estimated life
1023 *
1024 *	Obtain the current power status from the APM BIOS. We return a
1025 *	status which gives the rough battery status, and current power
1026 *	source. The bat value returned give an estimate as a percentage
1027 *	of life and a status value for the battery. The estimated life
1028 *	if reported is a lifetime in secodnds/minutes at current powwer
1029 *	consumption.
1030 */
1031
1032static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1033{
1034	struct apm_bios_call call;
1035
1036	call.func = APM_FUNC_GET_STATUS;
1037	call.ebx = APM_DEVICE_ALL;
1038	call.ecx = 0;
1039
1040	if (apm_info.get_power_status_broken)
1041		return APM_32_UNSUPPORTED;
1042	if (apm_bios_call(&call))
 
 
1043		return call.err;
 
1044	*status = call.ebx;
1045	*bat = call.ecx;
1046	if (apm_info.get_power_status_swabinminutes) {
1047		*life = swab16((u16)call.edx);
1048		*life |= 0x8000;
1049	} else
1050		*life = call.edx;
1051	return APM_SUCCESS;
1052}
1053
1054#if 0
1055static int apm_get_battery_status(u_short which, u_short *status,
1056				  u_short *bat, u_short *life, u_short *nbat)
1057{
1058	u32 eax;
1059	u32 ebx;
1060	u32 ecx;
1061	u32 edx;
1062	u32 esi;
1063
1064	if (apm_info.connection_version < 0x0102) {
1065		/* pretend we only have one battery. */
1066		if (which != 1)
1067			return APM_BAD_DEVICE;
1068		*nbat = 1;
1069		return apm_get_power_status(status, bat, life);
1070	}
1071
1072	if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1073			  &ebx, &ecx, &edx, &esi))
1074		return (eax >> 8) & 0xff;
1075	*status = ebx;
1076	*bat = ecx;
1077	*life = edx;
1078	*nbat = esi;
1079	return APM_SUCCESS;
1080}
1081#endif
1082
1083/**
1084 *	apm_engage_power_management	-	enable PM on a device
1085 *	@device: identity of device
1086 *	@enable: on/off
1087 *
1088 *	Activate or deactive power management on either a specific device
1089 *	or the entire system (%APM_DEVICE_ALL).
1090 */
1091
1092static int apm_engage_power_management(u_short device, int enable)
1093{
1094	u32 eax;
1095	int err;
1096
1097	if ((enable == 0) && (device == APM_DEVICE_ALL)
1098	    && (apm_info.bios.flags & APM_BIOS_DISABLED))
1099		return APM_DISABLED;
1100	if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1101				 &eax, &err))
1102		return err;
1103	if (device == APM_DEVICE_ALL) {
1104		if (enable)
1105			apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1106		else
1107			apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1108	}
1109	return APM_SUCCESS;
1110}
1111
1112#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1113
1114/**
1115 *	apm_console_blank	-	blank the display
1116 *	@blank: on/off
1117 *
1118 *	Attempt to blank the console, firstly by blanking just video device
1119 *	zero, and if that fails (some BIOSes don't support it) then it blanks
1120 *	all video devices. Typically the BIOS will do laptop backlight and
1121 *	monitor powerdown for us.
1122 */
1123
1124static int apm_console_blank(int blank)
1125{
1126	int error = APM_NOT_ENGAGED; /* silence gcc */
1127	int i;
1128	u_short state;
1129	static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1130
1131	state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1132
1133	for (i = 0; i < ARRAY_SIZE(dev); i++) {
1134		error = set_power_state(dev[i], state);
1135
1136		if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1137			return 1;
1138
1139		if (error == APM_NOT_ENGAGED)
1140			break;
1141	}
1142
1143	if (error == APM_NOT_ENGAGED) {
1144		static int tried;
1145		int eng_error;
1146		if (tried++ == 0) {
1147			eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1148			if (eng_error) {
1149				apm_error("set display", error);
1150				apm_error("engage interface", eng_error);
1151				return 0;
1152			} else
1153				return apm_console_blank(blank);
1154		}
1155	}
1156	apm_error("set display", error);
1157	return 0;
1158}
1159#endif
1160
1161static int queue_empty(struct apm_user *as)
1162{
1163	return as->event_head == as->event_tail;
1164}
1165
1166static apm_event_t get_queued_event(struct apm_user *as)
1167{
1168	if (++as->event_tail >= APM_MAX_EVENTS)
1169		as->event_tail = 0;
1170	return as->events[as->event_tail];
1171}
1172
1173static void queue_event(apm_event_t event, struct apm_user *sender)
1174{
1175	struct apm_user *as;
1176
1177	spin_lock(&user_list_lock);
1178	if (user_list == NULL)
1179		goto out;
1180	for (as = user_list; as != NULL; as = as->next) {
1181		if ((as == sender) || (!as->reader))
1182			continue;
1183		if (++as->event_head >= APM_MAX_EVENTS)
1184			as->event_head = 0;
1185
1186		if (as->event_head == as->event_tail) {
1187			static int notified;
1188
1189			if (notified++ == 0)
1190			    printk(KERN_ERR "apm: an event queue overflowed\n");
1191			if (++as->event_tail >= APM_MAX_EVENTS)
1192				as->event_tail = 0;
1193		}
1194		as->events[as->event_head] = event;
1195		if (!as->suser || !as->writer)
1196			continue;
1197		switch (event) {
1198		case APM_SYS_SUSPEND:
1199		case APM_USER_SUSPEND:
1200			as->suspends_pending++;
1201			suspends_pending++;
1202			break;
1203
1204		case APM_SYS_STANDBY:
1205		case APM_USER_STANDBY:
1206			as->standbys_pending++;
1207			standbys_pending++;
1208			break;
1209		}
1210	}
1211	wake_up_interruptible(&apm_waitqueue);
1212out:
1213	spin_unlock(&user_list_lock);
1214}
1215
1216static void reinit_timer(void)
1217{
1218#ifdef INIT_TIMER_AFTER_SUSPEND
1219	unsigned long flags;
1220
1221	raw_spin_lock_irqsave(&i8253_lock, flags);
1222	/* set the clock to HZ */
1223	outb_p(0x34, PIT_MODE);		/* binary, mode 2, LSB/MSB, ch 0 */
1224	udelay(10);
1225	outb_p(LATCH & 0xff, PIT_CH0);	/* LSB */
1226	udelay(10);
1227	outb_p(LATCH >> 8, PIT_CH0);	/* MSB */
1228	udelay(10);
1229	raw_spin_unlock_irqrestore(&i8253_lock, flags);
1230#endif
1231}
1232
1233static int suspend(int vetoable)
1234{
1235	int err;
1236	struct apm_user	*as;
1237
1238	dpm_suspend_start(PMSG_SUSPEND);
1239
1240	dpm_suspend_noirq(PMSG_SUSPEND);
1241
1242	local_irq_disable();
1243	syscore_suspend();
1244
1245	local_irq_enable();
1246
1247	save_processor_state();
1248	err = set_system_power_state(APM_STATE_SUSPEND);
1249	ignore_normal_resume = 1;
1250	restore_processor_state();
1251
1252	local_irq_disable();
1253	reinit_timer();
1254
1255	if (err == APM_NO_ERROR)
1256		err = APM_SUCCESS;
1257	if (err != APM_SUCCESS)
1258		apm_error("suspend", err);
1259	err = (err == APM_SUCCESS) ? 0 : -EIO;
1260
1261	syscore_resume();
1262	local_irq_enable();
1263
1264	dpm_resume_noirq(PMSG_RESUME);
 
1265
1266	dpm_resume_end(PMSG_RESUME);
1267	queue_event(APM_NORMAL_RESUME, NULL);
1268	spin_lock(&user_list_lock);
1269	for (as = user_list; as != NULL; as = as->next) {
1270		as->suspend_wait = 0;
1271		as->suspend_result = err;
1272	}
1273	spin_unlock(&user_list_lock);
1274	wake_up_interruptible(&apm_suspend_waitqueue);
1275	return err;
1276}
1277
1278static void standby(void)
1279{
1280	int err;
1281
1282	dpm_suspend_noirq(PMSG_SUSPEND);
1283
1284	local_irq_disable();
1285	syscore_suspend();
1286	local_irq_enable();
1287
1288	err = set_system_power_state(APM_STATE_STANDBY);
1289	if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1290		apm_error("standby", err);
1291
1292	local_irq_disable();
1293	syscore_resume();
1294	local_irq_enable();
1295
1296	dpm_resume_noirq(PMSG_RESUME);
1297}
1298
1299static apm_event_t get_event(void)
1300{
1301	int error;
1302	apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1303	apm_eventinfo_t	info;
1304
1305	static int notified;
1306
1307	/* we don't use the eventinfo */
1308	error = apm_get_event(&event, &info);
1309	if (error == APM_SUCCESS)
1310		return event;
1311
1312	if ((error != APM_NO_EVENTS) && (notified++ == 0))
1313		apm_error("get_event", error);
1314
1315	return 0;
1316}
1317
1318static void check_events(void)
1319{
1320	apm_event_t event;
1321	static unsigned long last_resume;
1322	static int ignore_bounce;
1323
1324	while ((event = get_event()) != 0) {
1325		if (debug) {
1326			if (event <= NR_APM_EVENT_NAME)
1327				printk(KERN_DEBUG "apm: received %s notify\n",
1328				       apm_event_name[event - 1]);
1329			else
1330				printk(KERN_DEBUG "apm: received unknown "
1331				       "event 0x%02x\n", event);
1332		}
1333		if (ignore_bounce
1334		    && (time_after(jiffies, last_resume + bounce_interval)))
1335			ignore_bounce = 0;
1336
1337		switch (event) {
1338		case APM_SYS_STANDBY:
1339		case APM_USER_STANDBY:
1340			queue_event(event, NULL);
1341			if (standbys_pending <= 0)
1342				standby();
1343			break;
1344
1345		case APM_USER_SUSPEND:
1346#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1347			if (apm_info.connection_version > 0x100)
1348				set_system_power_state(APM_STATE_REJECT);
1349			break;
1350#endif
1351		case APM_SYS_SUSPEND:
1352			if (ignore_bounce) {
1353				if (apm_info.connection_version > 0x100)
1354					set_system_power_state(APM_STATE_REJECT);
1355				break;
1356			}
1357			/*
1358			 * If we are already processing a SUSPEND,
1359			 * then further SUSPEND events from the BIOS
1360			 * will be ignored.  We also return here to
1361			 * cope with the fact that the Thinkpads keep
1362			 * sending a SUSPEND event until something else
1363			 * happens!
1364			 */
1365			if (ignore_sys_suspend)
1366				return;
1367			ignore_sys_suspend = 1;
1368			queue_event(event, NULL);
1369			if (suspends_pending <= 0)
1370				(void) suspend(1);
1371			break;
1372
1373		case APM_NORMAL_RESUME:
1374		case APM_CRITICAL_RESUME:
1375		case APM_STANDBY_RESUME:
1376			ignore_sys_suspend = 0;
1377			last_resume = jiffies;
1378			ignore_bounce = 1;
1379			if ((event != APM_NORMAL_RESUME)
1380			    || (ignore_normal_resume == 0)) {
1381				dpm_resume_end(PMSG_RESUME);
1382				queue_event(event, NULL);
1383			}
1384			ignore_normal_resume = 0;
1385			break;
1386
1387		case APM_CAPABILITY_CHANGE:
1388		case APM_LOW_BATTERY:
1389		case APM_POWER_STATUS_CHANGE:
1390			queue_event(event, NULL);
1391			/* If needed, notify drivers here */
1392			break;
1393
1394		case APM_UPDATE_TIME:
1395			break;
1396
1397		case APM_CRITICAL_SUSPEND:
1398			/*
1399			 * We are not allowed to reject a critical suspend.
1400			 */
1401			(void)suspend(0);
1402			break;
1403		}
1404	}
1405}
1406
1407static void apm_event_handler(void)
1408{
1409	static int pending_count = 4;
1410	int err;
1411
1412	if ((standbys_pending > 0) || (suspends_pending > 0)) {
1413		if ((apm_info.connection_version > 0x100) &&
1414		    (pending_count-- <= 0)) {
1415			pending_count = 4;
1416			if (debug)
1417				printk(KERN_DEBUG "apm: setting state busy\n");
1418			err = set_system_power_state(APM_STATE_BUSY);
1419			if (err)
1420				apm_error("busy", err);
1421		}
1422	} else
1423		pending_count = 4;
1424	check_events();
1425}
1426
1427/*
1428 * This is the APM thread main loop.
1429 */
1430
1431static void apm_mainloop(void)
1432{
1433	DECLARE_WAITQUEUE(wait, current);
1434
1435	add_wait_queue(&apm_waitqueue, &wait);
1436	set_current_state(TASK_INTERRUPTIBLE);
1437	for (;;) {
1438		schedule_timeout(APM_CHECK_TIMEOUT);
1439		if (kthread_should_stop())
1440			break;
1441		/*
1442		 * Ok, check all events, check for idle (and mark us sleeping
1443		 * so as not to count towards the load average)..
1444		 */
1445		set_current_state(TASK_INTERRUPTIBLE);
1446		apm_event_handler();
1447	}
1448	remove_wait_queue(&apm_waitqueue, &wait);
1449}
1450
1451static int check_apm_user(struct apm_user *as, const char *func)
1452{
1453	if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1454		printk(KERN_ERR "apm: %s passed bad filp\n", func);
1455		return 1;
1456	}
1457	return 0;
1458}
1459
1460static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1461{
1462	struct apm_user *as;
1463	int i;
1464	apm_event_t event;
1465
1466	as = fp->private_data;
1467	if (check_apm_user(as, "read"))
1468		return -EIO;
1469	if ((int)count < sizeof(apm_event_t))
1470		return -EINVAL;
1471	if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1472		return -EAGAIN;
1473	wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1474	i = count;
1475	while ((i >= sizeof(event)) && !queue_empty(as)) {
1476		event = get_queued_event(as);
1477		if (copy_to_user(buf, &event, sizeof(event))) {
1478			if (i < count)
1479				break;
1480			return -EFAULT;
1481		}
1482		switch (event) {
1483		case APM_SYS_SUSPEND:
1484		case APM_USER_SUSPEND:
1485			as->suspends_read++;
1486			break;
1487
1488		case APM_SYS_STANDBY:
1489		case APM_USER_STANDBY:
1490			as->standbys_read++;
1491			break;
1492		}
1493		buf += sizeof(event);
1494		i -= sizeof(event);
1495	}
1496	if (i < count)
1497		return count - i;
1498	if (signal_pending(current))
1499		return -ERESTARTSYS;
1500	return 0;
1501}
1502
1503static unsigned int do_poll(struct file *fp, poll_table *wait)
1504{
1505	struct apm_user *as;
1506
1507	as = fp->private_data;
1508	if (check_apm_user(as, "poll"))
1509		return 0;
1510	poll_wait(fp, &apm_waitqueue, wait);
1511	if (!queue_empty(as))
1512		return POLLIN | POLLRDNORM;
1513	return 0;
1514}
1515
1516static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1517{
1518	struct apm_user *as;
1519	int ret;
1520
1521	as = filp->private_data;
1522	if (check_apm_user(as, "ioctl"))
1523		return -EIO;
1524	if (!as->suser || !as->writer)
1525		return -EPERM;
1526	switch (cmd) {
1527	case APM_IOC_STANDBY:
1528		mutex_lock(&apm_mutex);
1529		if (as->standbys_read > 0) {
1530			as->standbys_read--;
1531			as->standbys_pending--;
1532			standbys_pending--;
1533		} else
1534			queue_event(APM_USER_STANDBY, as);
1535		if (standbys_pending <= 0)
1536			standby();
1537		mutex_unlock(&apm_mutex);
1538		break;
1539	case APM_IOC_SUSPEND:
1540		mutex_lock(&apm_mutex);
1541		if (as->suspends_read > 0) {
1542			as->suspends_read--;
1543			as->suspends_pending--;
1544			suspends_pending--;
1545		} else
1546			queue_event(APM_USER_SUSPEND, as);
1547		if (suspends_pending <= 0) {
1548			ret = suspend(1);
1549			mutex_unlock(&apm_mutex);
1550		} else {
1551			as->suspend_wait = 1;
1552			mutex_unlock(&apm_mutex);
1553			wait_event_interruptible(apm_suspend_waitqueue,
1554					as->suspend_wait == 0);
1555			ret = as->suspend_result;
1556		}
1557		return ret;
1558	default:
1559		return -ENOTTY;
1560	}
1561	return 0;
1562}
1563
1564static int do_release(struct inode *inode, struct file *filp)
1565{
1566	struct apm_user *as;
1567
1568	as = filp->private_data;
1569	if (check_apm_user(as, "release"))
1570		return 0;
1571	filp->private_data = NULL;
1572	if (as->standbys_pending > 0) {
1573		standbys_pending -= as->standbys_pending;
1574		if (standbys_pending <= 0)
1575			standby();
1576	}
1577	if (as->suspends_pending > 0) {
1578		suspends_pending -= as->suspends_pending;
1579		if (suspends_pending <= 0)
1580			(void) suspend(1);
1581	}
1582	spin_lock(&user_list_lock);
1583	if (user_list == as)
1584		user_list = as->next;
1585	else {
1586		struct apm_user *as1;
1587
1588		for (as1 = user_list;
1589		     (as1 != NULL) && (as1->next != as);
1590		     as1 = as1->next)
1591			;
1592		if (as1 == NULL)
1593			printk(KERN_ERR "apm: filp not in user list\n");
1594		else
1595			as1->next = as->next;
1596	}
1597	spin_unlock(&user_list_lock);
1598	kfree(as);
1599	return 0;
1600}
1601
1602static int do_open(struct inode *inode, struct file *filp)
1603{
1604	struct apm_user *as;
1605
1606	as = kmalloc(sizeof(*as), GFP_KERNEL);
1607	if (as == NULL) {
1608		printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1609		       sizeof(*as));
1610		return -ENOMEM;
1611	}
1612	as->magic = APM_BIOS_MAGIC;
1613	as->event_tail = as->event_head = 0;
1614	as->suspends_pending = as->standbys_pending = 0;
1615	as->suspends_read = as->standbys_read = 0;
1616	/*
1617	 * XXX - this is a tiny bit broken, when we consider BSD
1618	 * process accounting. If the device is opened by root, we
1619	 * instantly flag that we used superuser privs. Who knows,
1620	 * we might close the device immediately without doing a
1621	 * privileged operation -- cevans
1622	 */
1623	as->suser = capable(CAP_SYS_ADMIN);
1624	as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1625	as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1626	spin_lock(&user_list_lock);
1627	as->next = user_list;
1628	user_list = as;
1629	spin_unlock(&user_list_lock);
1630	filp->private_data = as;
1631	return 0;
1632}
1633
1634static int proc_apm_show(struct seq_file *m, void *v)
1635{
1636	unsigned short	bx;
1637	unsigned short	cx;
1638	unsigned short	dx;
1639	int		error;
1640	unsigned short  ac_line_status = 0xff;
1641	unsigned short  battery_status = 0xff;
1642	unsigned short  battery_flag   = 0xff;
1643	int		percentage     = -1;
1644	int             time_units     = -1;
1645	char            *units         = "?";
1646
1647	if ((num_online_cpus() == 1) &&
1648	    !(error = apm_get_power_status(&bx, &cx, &dx))) {
1649		ac_line_status = (bx >> 8) & 0xff;
1650		battery_status = bx & 0xff;
1651		if ((cx & 0xff) != 0xff)
1652			percentage = cx & 0xff;
1653
1654		if (apm_info.connection_version > 0x100) {
1655			battery_flag = (cx >> 8) & 0xff;
1656			if (dx != 0xffff) {
1657				units = (dx & 0x8000) ? "min" : "sec";
1658				time_units = dx & 0x7fff;
1659			}
1660		}
1661	}
1662	/* Arguments, with symbols from linux/apm_bios.h.  Information is
1663	   from the Get Power Status (0x0a) call unless otherwise noted.
1664
1665	   0) Linux driver version (this will change if format changes)
1666	   1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
1667	   2) APM flags from APM Installation Check (0x00):
1668	      bit 0: APM_16_BIT_SUPPORT
1669	      bit 1: APM_32_BIT_SUPPORT
1670	      bit 2: APM_IDLE_SLOWS_CLOCK
1671	      bit 3: APM_BIOS_DISABLED
1672	      bit 4: APM_BIOS_DISENGAGED
1673	   3) AC line status
1674	      0x00: Off-line
1675	      0x01: On-line
1676	      0x02: On backup power (BIOS >= 1.1 only)
1677	      0xff: Unknown
1678	   4) Battery status
1679	      0x00: High
1680	      0x01: Low
1681	      0x02: Critical
1682	      0x03: Charging
1683	      0x04: Selected battery not present (BIOS >= 1.2 only)
1684	      0xff: Unknown
1685	   5) Battery flag
1686	      bit 0: High
1687	      bit 1: Low
1688	      bit 2: Critical
1689	      bit 3: Charging
1690	      bit 7: No system battery
1691	      0xff: Unknown
1692	   6) Remaining battery life (percentage of charge):
1693	      0-100: valid
1694	      -1: Unknown
1695	   7) Remaining battery life (time units):
1696	      Number of remaining minutes or seconds
1697	      -1: Unknown
1698	   8) min = minutes; sec = seconds */
1699
1700	seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1701		   driver_version,
1702		   (apm_info.bios.version >> 8) & 0xff,
1703		   apm_info.bios.version & 0xff,
1704		   apm_info.bios.flags,
1705		   ac_line_status,
1706		   battery_status,
1707		   battery_flag,
1708		   percentage,
1709		   time_units,
1710		   units);
1711	return 0;
1712}
1713
1714static int proc_apm_open(struct inode *inode, struct file *file)
1715{
1716	return single_open(file, proc_apm_show, NULL);
1717}
1718
1719static const struct file_operations apm_file_ops = {
1720	.owner		= THIS_MODULE,
1721	.open		= proc_apm_open,
1722	.read		= seq_read,
1723	.llseek		= seq_lseek,
1724	.release	= single_release,
1725};
1726
1727static int apm(void *unused)
1728{
1729	unsigned short	bx;
1730	unsigned short	cx;
1731	unsigned short	dx;
1732	int		error;
1733	char 		*power_stat;
1734	char 		*bat_stat;
1735
1736	/* 2002/08/01 - WT
1737	 * This is to avoid random crashes at boot time during initialization
1738	 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1739	 * Some bioses don't like being called from CPU != 0.
1740	 * Method suggested by Ingo Molnar.
1741	 */
1742	set_cpus_allowed_ptr(current, cpumask_of(0));
1743	BUG_ON(smp_processor_id() != 0);
1744
1745	if (apm_info.connection_version == 0) {
1746		apm_info.connection_version = apm_info.bios.version;
1747		if (apm_info.connection_version > 0x100) {
1748			/*
1749			 * We only support BIOSs up to version 1.2
1750			 */
1751			if (apm_info.connection_version > 0x0102)
1752				apm_info.connection_version = 0x0102;
1753			error = apm_driver_version(&apm_info.connection_version);
1754			if (error != APM_SUCCESS) {
1755				apm_error("driver version", error);
1756				/* Fall back to an APM 1.0 connection. */
1757				apm_info.connection_version = 0x100;
1758			}
1759		}
1760	}
1761
1762	if (debug)
1763		printk(KERN_INFO "apm: Connection version %d.%d\n",
1764			(apm_info.connection_version >> 8) & 0xff,
1765			apm_info.connection_version & 0xff);
1766
1767#ifdef CONFIG_APM_DO_ENABLE
1768	if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1769		/*
1770		 * This call causes my NEC UltraLite Versa 33/C to hang if it
1771		 * is booted with PM disabled but not in the docking station.
1772		 * Unfortunate ...
1773		 */
1774		error = apm_enable_power_management(1);
1775		if (error) {
1776			apm_error("enable power management", error);
1777			return -1;
1778		}
1779	}
1780#endif
1781
1782	if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1783	    && (apm_info.connection_version > 0x0100)) {
1784		error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1785		if (error) {
1786			apm_error("engage power management", error);
1787			return -1;
1788		}
1789	}
1790
1791	if (debug && (num_online_cpus() == 1 || smp)) {
1792		error = apm_get_power_status(&bx, &cx, &dx);
1793		if (error)
1794			printk(KERN_INFO "apm: power status not available\n");
1795		else {
1796			switch ((bx >> 8) & 0xff) {
1797			case 0:
1798				power_stat = "off line";
1799				break;
1800			case 1:
1801				power_stat = "on line";
1802				break;
1803			case 2:
1804				power_stat = "on backup power";
1805				break;
1806			default:
1807				power_stat = "unknown";
1808				break;
1809			}
1810			switch (bx & 0xff) {
1811			case 0:
1812				bat_stat = "high";
1813				break;
1814			case 1:
1815				bat_stat = "low";
1816				break;
1817			case 2:
1818				bat_stat = "critical";
1819				break;
1820			case 3:
1821				bat_stat = "charging";
1822				break;
1823			default:
1824				bat_stat = "unknown";
1825				break;
1826			}
1827			printk(KERN_INFO
1828			       "apm: AC %s, battery status %s, battery life ",
1829			       power_stat, bat_stat);
1830			if ((cx & 0xff) == 0xff)
1831				printk("unknown\n");
1832			else
1833				printk("%d%%\n", cx & 0xff);
1834			if (apm_info.connection_version > 0x100) {
1835				printk(KERN_INFO
1836				       "apm: battery flag 0x%02x, battery life ",
1837				       (cx >> 8) & 0xff);
1838				if (dx == 0xffff)
1839					printk("unknown\n");
1840				else
1841					printk("%d %s\n", dx & 0x7fff,
1842					       (dx & 0x8000) ?
1843					       "minutes" : "seconds");
1844			}
1845		}
1846	}
1847
1848	/* Install our power off handler.. */
1849	if (power_off)
1850		pm_power_off = apm_power_off;
1851
1852	if (num_online_cpus() == 1 || smp) {
1853#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1854		console_blank_hook = apm_console_blank;
1855#endif
1856		apm_mainloop();
1857#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1858		console_blank_hook = NULL;
1859#endif
1860	}
1861
1862	return 0;
1863}
1864
1865#ifndef MODULE
1866static int __init apm_setup(char *str)
1867{
1868	int invert;
1869
1870	while ((str != NULL) && (*str != '\0')) {
1871		if (strncmp(str, "off", 3) == 0)
1872			apm_disabled = 1;
1873		if (strncmp(str, "on", 2) == 0)
1874			apm_disabled = 0;
1875		if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1876		    (strncmp(str, "bounce_interval=", 16) == 0))
1877			bounce_interval = simple_strtol(str + 16, NULL, 0);
1878		if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1879		    (strncmp(str, "idle_threshold=", 15) == 0))
1880			idle_threshold = simple_strtol(str + 15, NULL, 0);
1881		if ((strncmp(str, "idle-period=", 12) == 0) ||
1882		    (strncmp(str, "idle_period=", 12) == 0))
1883			idle_period = simple_strtol(str + 12, NULL, 0);
1884		invert = (strncmp(str, "no-", 3) == 0) ||
1885			(strncmp(str, "no_", 3) == 0);
1886		if (invert)
1887			str += 3;
1888		if (strncmp(str, "debug", 5) == 0)
1889			debug = !invert;
1890		if ((strncmp(str, "power-off", 9) == 0) ||
1891		    (strncmp(str, "power_off", 9) == 0))
1892			power_off = !invert;
1893		if (strncmp(str, "smp", 3) == 0) {
1894			smp = !invert;
1895			idle_threshold = 100;
1896		}
1897		if ((strncmp(str, "allow-ints", 10) == 0) ||
1898		    (strncmp(str, "allow_ints", 10) == 0))
1899			apm_info.allow_ints = !invert;
1900		if ((strncmp(str, "broken-psr", 10) == 0) ||
1901		    (strncmp(str, "broken_psr", 10) == 0))
1902			apm_info.get_power_status_broken = !invert;
1903		if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1904		    (strncmp(str, "realmode_power_off", 18) == 0))
1905			apm_info.realmode_power_off = !invert;
1906		str = strchr(str, ',');
1907		if (str != NULL)
1908			str += strspn(str, ", \t");
1909	}
1910	return 1;
1911}
1912
1913__setup("apm=", apm_setup);
1914#endif
1915
1916static const struct file_operations apm_bios_fops = {
1917	.owner		= THIS_MODULE,
1918	.read		= do_read,
1919	.poll		= do_poll,
1920	.unlocked_ioctl	= do_ioctl,
1921	.open		= do_open,
1922	.release	= do_release,
1923	.llseek		= noop_llseek,
1924};
1925
1926static struct miscdevice apm_device = {
1927	APM_MINOR_DEV,
1928	"apm_bios",
1929	&apm_bios_fops
1930};
1931
1932
1933/* Simple "print if true" callback */
1934static int __init print_if_true(const struct dmi_system_id *d)
1935{
1936	printk("%s\n", d->ident);
1937	return 0;
1938}
1939
1940/*
1941 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1942 * disabled before the suspend. Linux used to get terribly confused by that.
1943 */
1944static int __init broken_ps2_resume(const struct dmi_system_id *d)
1945{
1946	printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1947	       "workaround hopefully not needed.\n", d->ident);
1948	return 0;
1949}
1950
1951/* Some bioses have a broken protected mode poweroff and need to use realmode */
1952static int __init set_realmode_power_off(const struct dmi_system_id *d)
1953{
1954	if (apm_info.realmode_power_off == 0) {
1955		apm_info.realmode_power_off = 1;
1956		printk(KERN_INFO "%s bios detected. "
1957		       "Using realmode poweroff only.\n", d->ident);
1958	}
1959	return 0;
1960}
1961
1962/* Some laptops require interrupts to be enabled during APM calls */
1963static int __init set_apm_ints(const struct dmi_system_id *d)
1964{
1965	if (apm_info.allow_ints == 0) {
1966		apm_info.allow_ints = 1;
1967		printk(KERN_INFO "%s machine detected. "
1968		       "Enabling interrupts during APM calls.\n", d->ident);
1969	}
1970	return 0;
1971}
1972
1973/* Some APM bioses corrupt memory or just plain do not work */
1974static int __init apm_is_horked(const struct dmi_system_id *d)
1975{
1976	if (apm_info.disabled == 0) {
1977		apm_info.disabled = 1;
1978		printk(KERN_INFO "%s machine detected. "
1979		       "Disabling APM.\n", d->ident);
1980	}
1981	return 0;
1982}
1983
1984static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1985{
1986	if (apm_info.disabled == 0) {
1987		apm_info.disabled = 1;
1988		printk(KERN_INFO "%s machine detected. "
1989		       "Disabling APM.\n", d->ident);
1990		printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1991		printk(KERN_INFO "download from support.intel.com\n");
1992	}
1993	return 0;
1994}
1995
1996/* Some APM bioses hang on APM idle calls */
1997static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1998{
1999	if (apm_info.forbid_idle == 0) {
2000		apm_info.forbid_idle = 1;
2001		printk(KERN_INFO "%s machine detected. "
2002		       "Disabling APM idle calls.\n", d->ident);
2003	}
2004	return 0;
2005}
2006
2007/*
2008 *  Check for clue free BIOS implementations who use
2009 *  the following QA technique
2010 *
2011 *      [ Write BIOS Code ]<------
2012 *               |                ^
2013 *      < Does it Compile >----N--
2014 *               |Y               ^
2015 *	< Does it Boot Win98 >-N--
2016 *               |Y
2017 *           [Ship It]
2018 *
2019 *	Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
2020 *	Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
2021 */
2022static int __init broken_apm_power(const struct dmi_system_id *d)
2023{
2024	apm_info.get_power_status_broken = 1;
2025	printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2026	       "disabling power status reporting.\n");
2027	return 0;
2028}
2029
2030/*
2031 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2032 * have this problem).
2033 */
2034static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2035{
2036	apm_info.get_power_status_swabinminutes = 1;
2037	printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2038	       "in minutes and wrong byte order.\n");
2039	return 0;
2040}
2041
2042static struct dmi_system_id __initdata apm_dmi_table[] = {
2043	{
2044		print_if_true,
2045		KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2046		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2047			DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2048	},
2049	{	/* Handle problems with APM on the C600 */
2050		broken_ps2_resume, "Dell Latitude C600",
2051		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2052			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2053	},
2054	{	/* Allow interrupts during suspend on Dell Latitude laptops*/
2055		set_apm_ints, "Dell Latitude",
2056		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2057			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2058	},
2059	{	/* APM crashes */
2060		apm_is_horked, "Dell Inspiron 2500",
2061		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2062			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2063			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2064			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2065	},
2066	{	/* Allow interrupts during suspend on Dell Inspiron laptops*/
2067		set_apm_ints, "Dell Inspiron", {
2068			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2069			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2070	},
2071	{	/* Handle problems with APM on Inspiron 5000e */
2072		broken_apm_power, "Dell Inspiron 5000e",
2073		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2074			DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2075			DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2076	},
2077	{	/* Handle problems with APM on Inspiron 2500 */
2078		broken_apm_power, "Dell Inspiron 2500",
2079		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2080			DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2081			DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2082	},
2083	{	/* APM crashes */
2084		apm_is_horked, "Dell Dimension 4100",
2085		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2086			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2087			DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2088			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2089	},
2090	{	/* Allow interrupts during suspend on Compaq Laptops*/
2091		set_apm_ints, "Compaq 12XL125",
2092		{	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2093			DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2094			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2095			DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2096	},
2097	{	/* Allow interrupts during APM or the clock goes slow */
2098		set_apm_ints, "ASUSTeK",
2099		{	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2100			DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2101	},
2102	{	/* APM blows on shutdown */
2103		apm_is_horked, "ABIT KX7-333[R]",
2104		{	DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2105			DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2106	},
2107	{	/* APM crashes */
2108		apm_is_horked, "Trigem Delhi3",
2109		{	DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2110			DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2111	},
2112	{	/* APM crashes */
2113		apm_is_horked, "Fujitsu-Siemens",
2114		{	DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2115			DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2116	},
2117	{	/* APM crashes */
2118		apm_is_horked_d850md, "Intel D850MD",
2119		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2120			DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2121	},
2122	{	/* APM crashes */
2123		apm_is_horked, "Intel D810EMO",
2124		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2125			DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2126	},
2127	{	/* APM crashes */
2128		apm_is_horked, "Dell XPS-Z",
2129		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2130			DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2131			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2132	},
2133	{	/* APM crashes */
2134		apm_is_horked, "Sharp PC-PJ/AX",
2135		{	DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2136			DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2137			DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2138			DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2139	},
2140	{	/* APM crashes */
2141		apm_is_horked, "Dell Inspiron 2500",
2142		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2143			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2144			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2145			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2146	},
2147	{	/* APM idle hangs */
2148		apm_likes_to_melt, "Jabil AMD",
2149		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2150			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2151	},
2152	{	/* APM idle hangs */
2153		apm_likes_to_melt, "AMI Bios",
2154		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2155			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2156	},
2157	{	/* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2158		swab_apm_power_in_minutes, "Sony VAIO",
2159		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2160			DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2161			DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2162	},
2163	{	/* Handle problems with APM on Sony Vaio PCG-N505VX */
2164		swab_apm_power_in_minutes, "Sony VAIO",
2165		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2166			DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2167			DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2168	},
2169	{	/* Handle problems with APM on Sony Vaio PCG-XG29 */
2170		swab_apm_power_in_minutes, "Sony VAIO",
2171		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2172			DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2173			DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2174	},
2175	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2176		swab_apm_power_in_minutes, "Sony VAIO",
2177		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2178			DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2179			DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2180	},
2181	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2182		swab_apm_power_in_minutes, "Sony VAIO",
2183		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2184			DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2185			DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2186	},
2187	{	/* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2188		swab_apm_power_in_minutes, "Sony VAIO",
2189		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2190			DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2191			DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2192	},
2193	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2194		swab_apm_power_in_minutes, "Sony VAIO",
2195		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2196			DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2197			DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2198	},
2199	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2200		swab_apm_power_in_minutes, "Sony VAIO",
2201		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2202			DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2203			DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2204	},
2205	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2206		swab_apm_power_in_minutes, "Sony VAIO",
2207		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2208			DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2209			DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2210	},
2211	{	/* Handle problems with APM on Sony Vaio PCG-F104K */
2212		swab_apm_power_in_minutes, "Sony VAIO",
2213		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2214			DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2215			DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2216	},
2217
2218	{	/* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2219		swab_apm_power_in_minutes, "Sony VAIO",
2220		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2221			DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2222			DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2223	},
2224	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2225		swab_apm_power_in_minutes, "Sony VAIO",
2226		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2227			DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2228			DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2229	},
2230	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2231		swab_apm_power_in_minutes, "Sony VAIO",
2232		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2233			DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2234			DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2235	},
2236	{	/* broken PM poweroff bios */
2237		set_realmode_power_off, "Award Software v4.60 PGMA",
2238		{	DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2239			DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2240			DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2241	},
2242
2243	/* Generic per vendor APM settings  */
2244
2245	{	/* Allow interrupts during suspend on IBM laptops */
2246		set_apm_ints, "IBM",
2247		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2248	},
2249
2250	{ }
2251};
2252
2253/*
2254 * Just start the APM thread. We do NOT want to do APM BIOS
2255 * calls from anything but the APM thread, if for no other reason
2256 * than the fact that we don't trust the APM BIOS. This way,
2257 * most common APM BIOS problems that lead to protection errors
2258 * etc will have at least some level of being contained...
2259 *
2260 * In short, if something bad happens, at least we have a choice
2261 * of just killing the apm thread..
2262 */
2263static int __init apm_init(void)
2264{
2265	struct desc_struct *gdt;
2266	int err;
2267
2268	dmi_check_system(apm_dmi_table);
2269
2270	if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2271		printk(KERN_INFO "apm: BIOS not found.\n");
2272		return -ENODEV;
2273	}
2274	printk(KERN_INFO
2275	       "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2276	       ((apm_info.bios.version >> 8) & 0xff),
2277	       (apm_info.bios.version & 0xff),
2278	       apm_info.bios.flags,
2279	       driver_version);
2280	if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2281		printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2282		return -ENODEV;
2283	}
2284
2285	if (allow_ints)
2286		apm_info.allow_ints = 1;
2287	if (broken_psr)
2288		apm_info.get_power_status_broken = 1;
2289	if (realmode_power_off)
2290		apm_info.realmode_power_off = 1;
2291	/* User can override, but default is to trust DMI */
2292	if (apm_disabled != -1)
2293		apm_info.disabled = apm_disabled;
2294
2295	/*
2296	 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2297	 * but is reportedly a 1.0 BIOS.
2298	 */
2299	if (apm_info.bios.version == 0x001)
2300		apm_info.bios.version = 0x100;
2301
2302	/* BIOS < 1.2 doesn't set cseg_16_len */
2303	if (apm_info.bios.version < 0x102)
2304		apm_info.bios.cseg_16_len = 0; /* 64k */
2305
2306	if (debug) {
2307		printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2308			apm_info.bios.cseg, apm_info.bios.offset,
2309			apm_info.bios.cseg_16, apm_info.bios.dseg);
2310		if (apm_info.bios.version > 0x100)
2311			printk(" cseg len %x, dseg len %x",
2312				apm_info.bios.cseg_len,
2313				apm_info.bios.dseg_len);
2314		if (apm_info.bios.version > 0x101)
2315			printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2316		printk("\n");
2317	}
2318
2319	if (apm_info.disabled) {
2320		printk(KERN_NOTICE "apm: disabled on user request.\n");
2321		return -ENODEV;
2322	}
2323	if ((num_online_cpus() > 1) && !power_off && !smp) {
2324		printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2325		apm_info.disabled = 1;
2326		return -ENODEV;
2327	}
2328	if (!acpi_disabled) {
2329		printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2330		apm_info.disabled = 1;
2331		return -ENODEV;
2332	}
2333
2334	/*
2335	 * Set up the long jump entry point to the APM BIOS, which is called
2336	 * from inline assembly.
2337	 */
2338	apm_bios_entry.offset = apm_info.bios.offset;
2339	apm_bios_entry.segment = APM_CS;
2340
2341	/*
2342	 * The APM 1.1 BIOS is supposed to provide limit information that it
2343	 * recognizes.  Many machines do this correctly, but many others do
2344	 * not restrict themselves to their claimed limit.  When this happens,
2345	 * they will cause a segmentation violation in the kernel at boot time.
2346	 * Most BIOS's, however, will respect a 64k limit, so we use that.
2347	 *
2348	 * Note we only set APM segments on CPU zero, since we pin the APM
2349	 * code to that CPU.
2350	 */
2351	gdt = get_cpu_gdt_table(0);
2352	set_desc_base(&gdt[APM_CS >> 3],
2353		 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2354	set_desc_base(&gdt[APM_CS_16 >> 3],
2355		 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2356	set_desc_base(&gdt[APM_DS >> 3],
2357		 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2358
2359	proc_create("apm", 0, NULL, &apm_file_ops);
2360
2361	kapmd_task = kthread_create(apm, NULL, "kapmd");
2362	if (IS_ERR(kapmd_task)) {
2363		printk(KERN_ERR "apm: disabled - Unable to start kernel "
2364				"thread.\n");
2365		err = PTR_ERR(kapmd_task);
2366		kapmd_task = NULL;
2367		remove_proc_entry("apm", NULL);
2368		return err;
2369	}
2370	wake_up_process(kapmd_task);
2371
2372	if (num_online_cpus() > 1 && !smp) {
2373		printk(KERN_NOTICE
2374		       "apm: disabled - APM is not SMP safe (power off active).\n");
2375		return 0;
2376	}
2377
2378	/*
2379	 * Note we don't actually care if the misc_device cannot be registered.
2380	 * this driver can do its job without it, even if userspace can't
2381	 * control it.  just log the error
2382	 */
2383	if (misc_register(&apm_device))
2384		printk(KERN_WARNING "apm: Could not register misc device.\n");
2385
2386	if (HZ != 100)
2387		idle_period = (idle_period * HZ) / 100;
2388	if (idle_threshold < 100) {
2389		original_pm_idle = pm_idle;
2390		pm_idle  = apm_cpu_idle;
2391		set_pm_idle = 1;
 
2392	}
2393
2394	return 0;
2395}
2396
2397static void __exit apm_exit(void)
2398{
2399	int error;
2400
2401	if (set_pm_idle) {
2402		pm_idle = original_pm_idle;
2403		/*
2404		 * We are about to unload the current idle thread pm callback
2405		 * (pm_idle), Wait for all processors to update cached/local
2406		 * copies of pm_idle before proceeding.
2407		 */
2408		cpu_idle_wait();
2409	}
2410	if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2411	    && (apm_info.connection_version > 0x0100)) {
2412		error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2413		if (error)
2414			apm_error("disengage power management", error);
2415	}
2416	misc_deregister(&apm_device);
2417	remove_proc_entry("apm", NULL);
2418	if (power_off)
2419		pm_power_off = NULL;
2420	if (kapmd_task) {
2421		kthread_stop(kapmd_task);
2422		kapmd_task = NULL;
2423	}
2424}
2425
2426module_init(apm_init);
2427module_exit(apm_exit);
2428
2429MODULE_AUTHOR("Stephen Rothwell");
2430MODULE_DESCRIPTION("Advanced Power Management");
2431MODULE_LICENSE("GPL");
2432module_param(debug, bool, 0644);
2433MODULE_PARM_DESC(debug, "Enable debug mode");
2434module_param(power_off, bool, 0444);
2435MODULE_PARM_DESC(power_off, "Enable power off");
2436module_param(bounce_interval, int, 0444);
2437MODULE_PARM_DESC(bounce_interval,
2438		"Set the number of ticks to ignore suspend bounces");
2439module_param(allow_ints, bool, 0444);
2440MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2441module_param(broken_psr, bool, 0444);
2442MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2443module_param(realmode_power_off, bool, 0444);
2444MODULE_PARM_DESC(realmode_power_off,
2445		"Switch to real mode before powering off");
2446module_param(idle_threshold, int, 0444);
2447MODULE_PARM_DESC(idle_threshold,
2448	"System idle percentage above which to make APM BIOS idle calls");
2449module_param(idle_period, int, 0444);
2450MODULE_PARM_DESC(idle_period,
2451	"Period (in sec/100) over which to caculate the idle percentage");
2452module_param(smp, bool, 0444);
2453MODULE_PARM_DESC(smp,
2454	"Set this to enable APM use on an SMP platform. Use with caution on older systems");
2455MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);