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v5.4
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* -*- linux-c -*-
   3 * APM BIOS driver for Linux
   4 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
   5 *
   6 * Initial development of this driver was funded by NEC Australia P/L
   7 *	and NEC Corporation
   8 *
 
 
 
 
 
 
 
 
 
 
   9 * October 1995, Rik Faith (faith@cs.unc.edu):
  10 *    Minor enhancements and updates (to the patch set) for 1.3.x
  11 *    Documentation
  12 * January 1996, Rik Faith (faith@cs.unc.edu):
  13 *    Make /proc/apm easy to format (bump driver version)
  14 * March 1996, Rik Faith (faith@cs.unc.edu):
  15 *    Prohibit APM BIOS calls unless apm_enabled.
  16 *    (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
  17 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
  18 *    Version 1.0 and 1.1
  19 * May 1996, Version 1.2
  20 * Feb 1998, Version 1.3
  21 * Feb 1998, Version 1.4
  22 * Aug 1998, Version 1.5
  23 * Sep 1998, Version 1.6
  24 * Nov 1998, Version 1.7
  25 * Jan 1999, Version 1.8
  26 * Jan 1999, Version 1.9
  27 * Oct 1999, Version 1.10
  28 * Nov 1999, Version 1.11
  29 * Jan 2000, Version 1.12
  30 * Feb 2000, Version 1.13
  31 * Nov 2000, Version 1.14
  32 * Oct 2001, Version 1.15
  33 * Jan 2002, Version 1.16
  34 * Oct 2002, Version 1.16ac
  35 *
  36 * History:
  37 *    0.6b: first version in official kernel, Linux 1.3.46
  38 *    0.7: changed /proc/apm format, Linux 1.3.58
  39 *    0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
  40 *    0.9: only call bios if bios is present, Linux 1.3.72
  41 *    1.0: use fixed device number, consolidate /proc/apm into this file,
  42 *         Linux 1.3.85
  43 *    1.1: support user-space standby and suspend, power off after system
  44 *         halted, Linux 1.3.98
  45 *    1.2: When resetting RTC after resume, take care so that the time
  46 *         is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
  47 *         <jtoth@princeton.edu>); improve interaction between
  48 *         screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
  49 *    1.2a:Simple change to stop mysterious bug reports with SMP also added
  50 *	   levels to the printk calls. APM is not defined for SMP machines.
  51 *         The new replacement for it is, but Linux doesn't yet support this.
  52 *         Alan Cox Linux 2.1.55
  53 *    1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
  54 *    1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
  55 *         Dean Gaudet <dgaudet@arctic.org>.
  56 *         C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
  57 *    1.5: Fix segment register reloading (in case of bad segments saved
  58 *         across BIOS call).
  59 *         Stephen Rothwell
  60 *    1.6: Cope with compiler/assembler differences.
  61 *         Only try to turn off the first display device.
  62 *         Fix OOPS at power off with no APM BIOS by Jan Echternach
  63 *                   <echter@informatik.uni-rostock.de>
  64 *         Stephen Rothwell
  65 *    1.7: Modify driver's cached copy of the disabled/disengaged flags
  66 *         to reflect current state of APM BIOS.
  67 *         Chris Rankin <rankinc@bellsouth.net>
  68 *         Reset interrupt 0 timer to 100Hz after suspend
  69 *         Chad Miller <cmiller@surfsouth.com>
  70 *         Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
  71 *         Richard Gooch <rgooch@atnf.csiro.au>
  72 *         Allow boot time disabling of APM
  73 *         Make boot messages far less verbose by default
  74 *         Make asm safer
  75 *         Stephen Rothwell
  76 *    1.8: Add CONFIG_APM_RTC_IS_GMT
  77 *         Richard Gooch <rgooch@atnf.csiro.au>
  78 *         change APM_NOINTS to CONFIG_APM_ALLOW_INTS
  79 *         remove dependency on CONFIG_PROC_FS
  80 *         Stephen Rothwell
  81 *    1.9: Fix small typo.  <laslo@wodip.opole.pl>
  82 *         Try to cope with BIOS's that need to have all display
  83 *         devices blanked and not just the first one.
  84 *         Ross Paterson <ross@soi.city.ac.uk>
  85 *         Fix segment limit setting it has always been wrong as
  86 *         the segments needed to have byte granularity.
  87 *         Mark a few things __init.
  88 *         Add hack to allow power off of SMP systems by popular request.
  89 *         Use CONFIG_SMP instead of __SMP__
  90 *         Ignore BOUNCES for three seconds.
  91 *         Stephen Rothwell
  92 *   1.10: Fix for Thinkpad return code.
  93 *         Merge 2.2 and 2.3 drivers.
  94 *         Remove APM dependencies in arch/i386/kernel/process.c
  95 *         Remove APM dependencies in drivers/char/sysrq.c
  96 *         Reset time across standby.
  97 *         Allow more inititialisation on SMP.
  98 *         Remove CONFIG_APM_POWER_OFF and make it boot time
  99 *         configurable (default on).
 100 *         Make debug only a boot time parameter (remove APM_DEBUG).
 101 *         Try to blank all devices on any error.
 102 *   1.11: Remove APM dependencies in drivers/char/console.c
 103 *         Check nr_running to detect if we are idle (from
 104 *         Borislav Deianov <borislav@lix.polytechnique.fr>)
 105 *         Fix for bioses that don't zero the top part of the
 106 *         entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
 107 *         (reported by Panos Katsaloulis <teras@writeme.com>).
 108 *         Real mode power off patch (Walter Hofmann
 109 *         <Walter.Hofmann@physik.stud.uni-erlangen.de>).
 110 *   1.12: Remove CONFIG_SMP as the compiler will optimize
 111 *         the code away anyway (smp_num_cpus == 1 in UP)
 112 *         noted by Artur Skawina <skawina@geocities.com>.
 113 *         Make power off under SMP work again.
 114 *         Fix thinko with initial engaging of BIOS.
 115 *         Make sure power off only happens on CPU 0
 116 *         (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
 117 *         Do error notification to user mode if BIOS calls fail.
 118 *         Move entrypoint offset fix to ...boot/setup.S
 119 *         where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
 120 *         Remove smp-power-off. SMP users must now specify
 121 *         "apm=power-off" on the kernel command line. Suggested
 122 *         by Jim Avera <jima@hal.com>, modified by Alan Cox
 123 *         <alan@lxorguk.ukuu.org.uk>.
 124 *         Register the /proc/apm entry even on SMP so that
 125 *         scripts that check for it before doing power off
 126 *         work (Jim Avera <jima@hal.com>).
 127 *   1.13: Changes for new pm_ interfaces (Andy Henroid
 128 *         <andy_henroid@yahoo.com>).
 129 *         Modularize the code.
 130 *         Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
 131 *         is now the way life works).
 132 *         Fix thinko in suspend() (wrong return).
 133 *         Notify drivers on critical suspend.
 134 *         Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz>
 135 *         modified by sfr).
 136 *         Disable interrupts while we are suspended (Andy Henroid
 137 *         <andy_henroid@yahoo.com> fixed by sfr).
 138 *         Make power off work on SMP again (Tony Hoyle
 139 *         <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
 140 *         Remove CONFIG_APM_SUSPEND_BOUNCE.  The bounce ignore
 141 *         interval is now configurable.
 142 *   1.14: Make connection version persist across module unload/load.
 143 *         Enable and engage power management earlier.
 144 *         Disengage power management on module unload.
 145 *         Changed to use the sysrq-register hack for registering the
 146 *         power off function called by magic sysrq based upon discussions
 147 *         in irc://irc.openprojects.net/#kernelnewbies
 148 *         (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
 149 *         Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
 150 *         (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
 151 *         Work around byte swap bug in one of the Vaio's BIOS's
 152 *         (Marc Boucher <marc@mbsi.ca>).
 153 *         Exposed the disable flag to dmi so that we can handle known
 154 *         broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>).
 155 *   1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
 156 *         calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
 157 *         If an APM idle fails log it and idle sensibly
 158 *   1.15: Don't queue events to clients who open the device O_WRONLY.
 159 *         Don't expect replies from clients who open the device O_RDONLY.
 160 *         (Idea from Thomas Hood)
 161 *         Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
 162 *   1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
 163 *         Notify listeners of standby or suspend events before notifying
 164 *         drivers. Return EBUSY to ioctl() if suspend is rejected.
 165 *         (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
 166 *         Ignore first resume after we generate our own resume event
 167 *         after a suspend (Thomas Hood)
 168 *         Daemonize now gets rid of our controlling terminal (sfr).
 169 *         CONFIG_APM_CPU_IDLE now just affects the default value of
 170 *         idle_threshold (sfr).
 171 *         Change name of kernel apm daemon (as it no longer idles) (sfr).
 172 *   1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
 173 *	   make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
 174 *	   TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
 175 *
 176 * APM 1.1 Reference:
 177 *
 178 *   Intel Corporation, Microsoft Corporation. Advanced Power Management
 179 *   (APM) BIOS Interface Specification, Revision 1.1, September 1993.
 180 *   Intel Order Number 241704-001.  Microsoft Part Number 781-110-X01.
 181 *
 182 * [This document is available free from Intel by calling 800.628.8686 (fax
 183 * 916.356.6100) or 800.548.4725; or from
 184 * http://www.microsoft.com/whdc/archive/amp_12.mspx  It is also
 185 * available from Microsoft by calling 206.882.8080.]
 186 *
 187 * APM 1.2 Reference:
 188 *   Intel Corporation, Microsoft Corporation. Advanced Power Management
 189 *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
 190 *
 191 * [This document is available from Microsoft at:
 192 *    http://www.microsoft.com/whdc/archive/amp_12.mspx]
 193 */
 194
 195#define pr_fmt(fmt) "apm: " fmt
 196
 197#include <linux/module.h>
 198
 199#include <linux/poll.h>
 200#include <linux/types.h>
 201#include <linux/stddef.h>
 202#include <linux/timer.h>
 203#include <linux/fcntl.h>
 204#include <linux/slab.h>
 205#include <linux/stat.h>
 206#include <linux/proc_fs.h>
 207#include <linux/seq_file.h>
 208#include <linux/miscdevice.h>
 209#include <linux/apm_bios.h>
 210#include <linux/init.h>
 211#include <linux/time.h>
 212#include <linux/sched/signal.h>
 213#include <linux/sched/cputime.h>
 214#include <linux/pm.h>
 215#include <linux/capability.h>
 216#include <linux/device.h>
 217#include <linux/kernel.h>
 218#include <linux/freezer.h>
 219#include <linux/smp.h>
 220#include <linux/dmi.h>
 221#include <linux/suspend.h>
 222#include <linux/kthread.h>
 223#include <linux/jiffies.h>
 224#include <linux/acpi.h>
 225#include <linux/syscore_ops.h>
 226#include <linux/i8253.h>
 227#include <linux/cpuidle.h>
 228
 229#include <linux/uaccess.h>
 230#include <asm/desc.h>
 231#include <asm/olpc.h>
 232#include <asm/paravirt.h>
 233#include <asm/reboot.h>
 234#include <asm/nospec-branch.h>
 235
 236#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
 237extern int (*console_blank_hook)(int);
 238#endif
 239
 240/*
 241 * The apm_bios device is one of the misc char devices.
 242 * This is its minor number.
 243 */
 244#define	APM_MINOR_DEV	134
 245
 246/*
 247 * Various options can be changed at boot time as follows:
 248 * (We allow underscores for compatibility with the modules code)
 249 *	apm=on/off			enable/disable APM
 250 *	    [no-]allow[-_]ints		allow interrupts during BIOS calls
 251 *	    [no-]broken[-_]psr		BIOS has a broken GetPowerStatus call
 252 *	    [no-]realmode[-_]power[-_]off	switch to real mode before
 253 *	    					powering off
 254 *	    [no-]debug			log some debugging messages
 255 *	    [no-]power[-_]off		power off on shutdown
 256 *	    [no-]smp			Use apm even on an SMP box
 257 *	    bounce[-_]interval=<n>	number of ticks to ignore suspend
 258 *	    				bounces
 259 *          idle[-_]threshold=<n>       System idle percentage above which to
 260 *                                      make APM BIOS idle calls. Set it to
 261 *                                      100 to disable.
 262 *          idle[-_]period=<n>          Period (in 1/100s of a second) over
 263 *                                      which the idle percentage is
 264 *                                      calculated.
 265 */
 266
 267/* KNOWN PROBLEM MACHINES:
 268 *
 269 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
 270 *                         [Confirmed by TI representative]
 271 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
 272 *                    [Confirmed by BIOS disassembly]
 273 *                    [This may work now ...]
 274 * P: Toshiba 1950S: battery life information only gets updated after resume
 275 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
 276 * 	broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
 277 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
 278 * 	Neale Banks <neale@lowendale.com.au> December 2000
 279 *
 280 * Legend: U = unusable with APM patches
 281 *         P = partially usable with APM patches
 282 */
 283
 284/*
 285 * Define as 1 to make the driver always call the APM BIOS busy
 286 * routine even if the clock was not reported as slowed by the
 287 * idle routine.  Otherwise, define as 0.
 288 */
 289#define ALWAYS_CALL_BUSY   1
 290
 291/*
 292 * Define to make the APM BIOS calls zero all data segment registers (so
 293 * that an incorrect BIOS implementation will cause a kernel panic if it
 294 * tries to write to arbitrary memory).
 295 */
 296#define APM_ZERO_SEGS
 297
 298#include <asm/apm.h>
 299
 300/*
 301 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
 302 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
 303 * David Chen <chen@ctpa04.mit.edu>
 304 */
 305#undef INIT_TIMER_AFTER_SUSPEND
 306
 307#ifdef INIT_TIMER_AFTER_SUSPEND
 308#include <linux/timex.h>
 309#include <asm/io.h>
 310#include <linux/delay.h>
 311#endif
 312
 313/*
 314 * Need to poll the APM BIOS every second
 315 */
 316#define APM_CHECK_TIMEOUT	(HZ)
 317
 318/*
 319 * Ignore suspend events for this amount of time after a resume
 320 */
 321#define DEFAULT_BOUNCE_INTERVAL	(3 * HZ)
 322
 323/*
 324 * Maximum number of events stored
 325 */
 326#define APM_MAX_EVENTS		20
 327
 328/*
 329 * The per-file APM data
 330 */
 331struct apm_user {
 332	int		magic;
 333	struct apm_user *next;
 334	unsigned int	suser: 1;
 335	unsigned int	writer: 1;
 336	unsigned int	reader: 1;
 337	unsigned int	suspend_wait: 1;
 338	int		suspend_result;
 339	int		suspends_pending;
 340	int		standbys_pending;
 341	int		suspends_read;
 342	int		standbys_read;
 343	int		event_head;
 344	int		event_tail;
 345	apm_event_t	events[APM_MAX_EVENTS];
 346};
 347
 348/*
 349 * The magic number in apm_user
 350 */
 351#define APM_BIOS_MAGIC		0x4101
 352
 353/*
 354 * idle percentage above which bios idle calls are done
 355 */
 356#ifdef CONFIG_APM_CPU_IDLE
 357#define DEFAULT_IDLE_THRESHOLD	95
 358#else
 359#define DEFAULT_IDLE_THRESHOLD	100
 360#endif
 361#define DEFAULT_IDLE_PERIOD	(100 / 3)
 362
 363static int apm_cpu_idle(struct cpuidle_device *dev,
 364			struct cpuidle_driver *drv, int index);
 365
 366static struct cpuidle_driver apm_idle_driver = {
 367	.name = "apm_idle",
 368	.owner = THIS_MODULE,
 369	.states = {
 370		{ /* entry 0 is for polling */ },
 371		{ /* entry 1 is for APM idle */
 372			.name = "APM",
 373			.desc = "APM idle",
 374			.exit_latency = 250,	/* WAG */
 375			.target_residency = 500,	/* WAG */
 376			.enter = &apm_cpu_idle
 377		},
 378	},
 379	.state_count = 2,
 380};
 381
 382static struct cpuidle_device apm_cpuidle_device;
 383
 384/*
 385 * Local variables
 386 */
 387__visible struct {
 388	unsigned long	offset;
 389	unsigned short	segment;
 390} apm_bios_entry;
 391static int clock_slowed;
 392static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
 393static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
 394static int suspends_pending;
 395static int standbys_pending;
 396static int ignore_sys_suspend;
 397static int ignore_normal_resume;
 398static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
 399
 400static bool debug __read_mostly;
 401static bool smp __read_mostly;
 402static int apm_disabled = -1;
 403#ifdef CONFIG_SMP
 404static bool power_off;
 405#else
 406static bool power_off = 1;
 407#endif
 408static bool realmode_power_off;
 409#ifdef CONFIG_APM_ALLOW_INTS
 410static bool allow_ints = 1;
 411#else
 412static bool allow_ints;
 413#endif
 414static bool broken_psr;
 415
 416static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
 417static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
 418static struct apm_user *user_list;
 419static DEFINE_SPINLOCK(user_list_lock);
 420static DEFINE_MUTEX(apm_mutex);
 421
 422/*
 423 * Set up a segment that references the real mode segment 0x40
 424 * that extends up to the end of page zero (that we have reserved).
 425 * This is for buggy BIOS's that refer to (real mode) segment 0x40
 426 * even though they are called in protected mode.
 427 */
 428static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
 429			(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
 430
 431static const char driver_version[] = "1.16ac";	/* no spaces */
 432
 433static struct task_struct *kapmd_task;
 434
 435/*
 436 *	APM event names taken from the APM 1.2 specification. These are
 437 *	the message codes that the BIOS uses to tell us about events
 438 */
 439static const char * const apm_event_name[] = {
 440	"system standby",
 441	"system suspend",
 442	"normal resume",
 443	"critical resume",
 444	"low battery",
 445	"power status change",
 446	"update time",
 447	"critical suspend",
 448	"user standby",
 449	"user suspend",
 450	"system standby resume",
 451	"capabilities change"
 452};
 453#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
 454
 455typedef struct lookup_t {
 456	int	key;
 457	char 	*msg;
 458} lookup_t;
 459
 460/*
 461 *	The BIOS returns a set of standard error codes in AX when the
 462 *	carry flag is set.
 463 */
 464
 465static const lookup_t error_table[] = {
 466/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
 467	{ APM_DISABLED,		"Power management disabled" },
 468	{ APM_CONNECTED,	"Real mode interface already connected" },
 469	{ APM_NOT_CONNECTED,	"Interface not connected" },
 470	{ APM_16_CONNECTED,	"16 bit interface already connected" },
 471/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
 472	{ APM_32_CONNECTED,	"32 bit interface already connected" },
 473	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
 474	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
 475	{ APM_BAD_PARAM,	"Parameter out of range" },
 476	{ APM_NOT_ENGAGED,	"Interface not engaged" },
 477	{ APM_BAD_FUNCTION,     "Function not supported" },
 478	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
 479	{ APM_BAD_STATE,	"Unable to enter requested state" },
 480/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
 481	{ APM_NO_ERROR,		"BIOS did not set a return code" },
 482	{ APM_NOT_PRESENT,	"No APM present" }
 483};
 484#define ERROR_COUNT	ARRAY_SIZE(error_table)
 485
 486/**
 487 *	apm_error	-	display an APM error
 488 *	@str: information string
 489 *	@err: APM BIOS return code
 490 *
 491 *	Write a meaningful log entry to the kernel log in the event of
 492 *	an APM error.  Note that this also handles (negative) kernel errors.
 493 */
 494
 495static void apm_error(char *str, int err)
 496{
 497	int i;
 498
 499	for (i = 0; i < ERROR_COUNT; i++)
 500		if (error_table[i].key == err)
 501			break;
 502	if (i < ERROR_COUNT)
 503		pr_notice("%s: %s\n", str, error_table[i].msg);
 504	else if (err < 0)
 505		pr_notice("%s: linux error code %i\n", str, err);
 506	else
 507		pr_notice("%s: unknown error code %#2.2x\n",
 508		       str, err);
 509}
 510
 511/*
 512 * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
 513 * apm_info.allow_ints, we are being really paranoid here!  Not only
 514 * are interrupts disabled, but all the segment registers (except SS)
 515 * are saved and zeroed this means that if the BIOS tries to reference
 516 * any data without explicitly loading the segment registers, the kernel
 517 * will fault immediately rather than have some unforeseen circumstances
 518 * for the rest of the kernel.  And it will be very obvious!  :-) Doing
 519 * this depends on CS referring to the same physical memory as DS so that
 520 * DS can be zeroed before the call. Unfortunately, we can't do anything
 521 * about the stack segment/pointer.  Also, we tell the compiler that
 522 * everything could change.
 523 *
 524 * Also, we KNOW that for the non error case of apm_bios_call, there
 525 * is no useful data returned in the low order 8 bits of eax.
 526 */
 527
 528static inline unsigned long __apm_irq_save(void)
 529{
 530	unsigned long flags;
 531	local_save_flags(flags);
 532	if (apm_info.allow_ints) {
 533		if (irqs_disabled_flags(flags))
 534			local_irq_enable();
 535	} else
 536		local_irq_disable();
 537
 538	return flags;
 539}
 540
 541#define apm_irq_save(flags) \
 542	do { flags = __apm_irq_save(); } while (0)
 543
 544static inline void apm_irq_restore(unsigned long flags)
 545{
 546	if (irqs_disabled_flags(flags))
 547		local_irq_disable();
 548	else if (irqs_disabled())
 549		local_irq_enable();
 550}
 551
 552#ifdef APM_ZERO_SEGS
 553#	define APM_DECL_SEGS \
 554		unsigned int saved_fs; unsigned int saved_gs;
 555#	define APM_DO_SAVE_SEGS \
 556		savesegment(fs, saved_fs); savesegment(gs, saved_gs)
 557#	define APM_DO_RESTORE_SEGS \
 558		loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
 559#else
 560#	define APM_DECL_SEGS
 561#	define APM_DO_SAVE_SEGS
 562#	define APM_DO_RESTORE_SEGS
 563#endif
 564
 565struct apm_bios_call {
 566	u32 func;
 567	/* In and out */
 568	u32 ebx;
 569	u32 ecx;
 570	/* Out only */
 571	u32 eax;
 572	u32 edx;
 573	u32 esi;
 574
 575	/* Error: -ENOMEM, or bits 8-15 of eax */
 576	int err;
 577};
 578
 579/**
 580 *	__apm_bios_call - Make an APM BIOS 32bit call
 581 *	@_call: pointer to struct apm_bios_call.
 582 *
 583 *	Make an APM call using the 32bit protected mode interface. The
 584 *	caller is responsible for knowing if APM BIOS is configured and
 585 *	enabled. This call can disable interrupts for a long period of
 586 *	time on some laptops.  The return value is in AH and the carry
 587 *	flag is loaded into AL.  If there is an error, then the error
 588 *	code is returned in AH (bits 8-15 of eax) and this function
 589 *	returns non-zero.
 590 *
 591 *	Note: this makes the call on the current CPU.
 592 */
 593static long __apm_bios_call(void *_call)
 594{
 595	APM_DECL_SEGS
 596	unsigned long		flags;
 597	int			cpu;
 598	struct desc_struct	save_desc_40;
 599	struct desc_struct	*gdt;
 600	struct apm_bios_call	*call = _call;
 601
 602	cpu = get_cpu();
 603	BUG_ON(cpu != 0);
 604	gdt = get_cpu_gdt_rw(cpu);
 605	save_desc_40 = gdt[0x40 / 8];
 606	gdt[0x40 / 8] = bad_bios_desc;
 607
 608	apm_irq_save(flags);
 609	firmware_restrict_branch_speculation_start();
 610	APM_DO_SAVE_SEGS;
 611	apm_bios_call_asm(call->func, call->ebx, call->ecx,
 612			  &call->eax, &call->ebx, &call->ecx, &call->edx,
 613			  &call->esi);
 614	APM_DO_RESTORE_SEGS;
 615	firmware_restrict_branch_speculation_end();
 616	apm_irq_restore(flags);
 617	gdt[0x40 / 8] = save_desc_40;
 618	put_cpu();
 619
 620	return call->eax & 0xff;
 621}
 622
 623/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
 624static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
 625{
 626	int ret;
 627
 628	/* Don't bother with work_on_cpu in the common case, so we don't
 629	 * have to worry about OOM or overhead. */
 630	if (get_cpu() == 0) {
 631		ret = fn(call);
 632		put_cpu();
 633	} else {
 634		put_cpu();
 635		ret = work_on_cpu(0, fn, call);
 636	}
 637
 638	/* work_on_cpu can fail with -ENOMEM */
 639	if (ret < 0)
 640		call->err = ret;
 641	else
 642		call->err = (call->eax >> 8) & 0xff;
 643
 644	return ret;
 645}
 646
 647/**
 648 *	apm_bios_call	-	Make an APM BIOS 32bit call (on CPU 0)
 649 *	@call: the apm_bios_call registers.
 650 *
 651 *	If there is an error, it is returned in @call.err.
 652 */
 653static int apm_bios_call(struct apm_bios_call *call)
 654{
 655	return on_cpu0(__apm_bios_call, call);
 656}
 657
 658/**
 659 *	__apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
 660 *	@_call: pointer to struct apm_bios_call.
 661 *
 662 *	Make a BIOS call that returns one value only, or just status.
 663 *	If there is an error, then the error code is returned in AH
 664 *	(bits 8-15 of eax) and this function returns non-zero (it can
 665 *	also return -ENOMEM). This is used for simpler BIOS operations.
 666 *	This call may hold interrupts off for a long time on some laptops.
 667 *
 668 *	Note: this makes the call on the current CPU.
 669 */
 670static long __apm_bios_call_simple(void *_call)
 671{
 672	u8			error;
 673	APM_DECL_SEGS
 674	unsigned long		flags;
 675	int			cpu;
 676	struct desc_struct	save_desc_40;
 677	struct desc_struct	*gdt;
 678	struct apm_bios_call	*call = _call;
 679
 680	cpu = get_cpu();
 681	BUG_ON(cpu != 0);
 682	gdt = get_cpu_gdt_rw(cpu);
 683	save_desc_40 = gdt[0x40 / 8];
 684	gdt[0x40 / 8] = bad_bios_desc;
 685
 686	apm_irq_save(flags);
 687	firmware_restrict_branch_speculation_start();
 688	APM_DO_SAVE_SEGS;
 689	error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
 690					 &call->eax);
 691	APM_DO_RESTORE_SEGS;
 692	firmware_restrict_branch_speculation_end();
 693	apm_irq_restore(flags);
 694	gdt[0x40 / 8] = save_desc_40;
 695	put_cpu();
 696	return error;
 697}
 698
 699/**
 700 *	apm_bios_call_simple	-	make a simple APM BIOS 32bit call
 701 *	@func: APM function to invoke
 702 *	@ebx_in: EBX register value for BIOS call
 703 *	@ecx_in: ECX register value for BIOS call
 704 *	@eax: EAX register on return from the BIOS call
 705 *	@err: bits
 706 *
 707 *	Make a BIOS call that returns one value only, or just status.
 708 *	If there is an error, then the error code is returned in @err
 709 *	and this function returns non-zero. This is used for simpler
 710 *	BIOS operations.  This call may hold interrupts off for a long
 711 *	time on some laptops.
 712 */
 713static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
 714				int *err)
 715{
 716	struct apm_bios_call call;
 717	int ret;
 718
 719	call.func = func;
 720	call.ebx = ebx_in;
 721	call.ecx = ecx_in;
 722
 723	ret = on_cpu0(__apm_bios_call_simple, &call);
 724	*eax = call.eax;
 725	*err = call.err;
 726	return ret;
 727}
 728
 729/**
 730 *	apm_driver_version	-	APM driver version
 731 *	@val:	loaded with the APM version on return
 732 *
 733 *	Retrieve the APM version supported by the BIOS. This is only
 734 *	supported for APM 1.1 or higher. An error indicates APM 1.0 is
 735 *	probably present.
 736 *
 737 *	On entry val should point to a value indicating the APM driver
 738 *	version with the high byte being the major and the low byte the
 739 *	minor number both in BCD
 740 *
 741 *	On return it will hold the BIOS revision supported in the
 742 *	same format.
 743 */
 744
 745static int apm_driver_version(u_short *val)
 746{
 747	u32 eax;
 748	int err;
 749
 750	if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
 751		return err;
 752	*val = eax;
 753	return APM_SUCCESS;
 754}
 755
 756/**
 757 *	apm_get_event	-	get an APM event from the BIOS
 758 *	@event: pointer to the event
 759 *	@info: point to the event information
 760 *
 761 *	The APM BIOS provides a polled information for event
 762 *	reporting. The BIOS expects to be polled at least every second
 763 *	when events are pending. When a message is found the caller should
 764 *	poll until no more messages are present.  However, this causes
 765 *	problems on some laptops where a suspend event notification is
 766 *	not cleared until it is acknowledged.
 767 *
 768 *	Additional information is returned in the info pointer, providing
 769 *	that APM 1.2 is in use. If no messges are pending the value 0x80
 770 *	is returned (No power management events pending).
 771 */
 772static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
 773{
 774	struct apm_bios_call call;
 775
 776	call.func = APM_FUNC_GET_EVENT;
 777	call.ebx = call.ecx = 0;
 778
 779	if (apm_bios_call(&call))
 780		return call.err;
 781
 782	*event = call.ebx;
 783	if (apm_info.connection_version < 0x0102)
 784		*info = ~0; /* indicate info not valid */
 785	else
 786		*info = call.ecx;
 787	return APM_SUCCESS;
 788}
 789
 790/**
 791 *	set_power_state	-	set the power management state
 792 *	@what: which items to transition
 793 *	@state: state to transition to
 794 *
 795 *	Request an APM change of state for one or more system devices. The
 796 *	processor state must be transitioned last of all. what holds the
 797 *	class of device in the upper byte and the device number (0xFF for
 798 *	all) for the object to be transitioned.
 799 *
 800 *	The state holds the state to transition to, which may in fact
 801 *	be an acceptance of a BIOS requested state change.
 802 */
 803
 804static int set_power_state(u_short what, u_short state)
 805{
 806	u32 eax;
 807	int err;
 808
 809	if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
 810		return err;
 811	return APM_SUCCESS;
 812}
 813
 814/**
 815 *	set_system_power_state - set system wide power state
 816 *	@state: which state to enter
 817 *
 818 *	Transition the entire system into a new APM power state.
 819 */
 820
 821static int set_system_power_state(u_short state)
 822{
 823	return set_power_state(APM_DEVICE_ALL, state);
 824}
 825
 826/**
 827 *	apm_do_idle	-	perform power saving
 828 *
 829 *	This function notifies the BIOS that the processor is (in the view
 830 *	of the OS) idle. It returns -1 in the event that the BIOS refuses
 831 *	to handle the idle request. On a success the function returns 1
 832 *	if the BIOS did clock slowing or 0 otherwise.
 833 */
 834
 835static int apm_do_idle(void)
 836{
 837	u32 eax;
 838	u8 ret = 0;
 839	int idled = 0;
 840	int err = 0;
 841
 842	if (!need_resched()) {
 843		idled = 1;
 844		ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
 845	}
 846
 847	if (!idled)
 848		return 0;
 849
 850	if (ret) {
 851		static unsigned long t;
 852
 853		/* This always fails on some SMP boards running UP kernels.
 854		 * Only report the failure the first 5 times.
 855		 */
 856		if (++t < 5) {
 857			printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
 858			t = jiffies;
 859		}
 860		return -1;
 861	}
 862	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
 863	return clock_slowed;
 864}
 865
 866/**
 867 *	apm_do_busy	-	inform the BIOS the CPU is busy
 868 *
 869 *	Request that the BIOS brings the CPU back to full performance.
 870 */
 871
 872static void apm_do_busy(void)
 873{
 874	u32 dummy;
 875	int err;
 876
 877	if (clock_slowed || ALWAYS_CALL_BUSY) {
 878		(void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
 879		clock_slowed = 0;
 880	}
 881}
 882
 883/*
 884 * If no process has really been interested in
 885 * the CPU for some time, we want to call BIOS
 886 * power management - we probably want
 887 * to conserve power.
 888 */
 889#define IDLE_CALC_LIMIT	(HZ * 100)
 890#define IDLE_LEAKY_MAX	16
 891
 892/**
 893 * apm_cpu_idle		-	cpu idling for APM capable Linux
 894 *
 895 * This is the idling function the kernel executes when APM is available. It
 896 * tries to do BIOS powermanagement based on the average system idle time.
 897 * Furthermore it calls the system default idle routine.
 898 */
 899
 900static int apm_cpu_idle(struct cpuidle_device *dev,
 901	struct cpuidle_driver *drv, int index)
 902{
 903	static int use_apm_idle; /* = 0 */
 904	static unsigned int last_jiffies; /* = 0 */
 905	static u64 last_stime; /* = 0 */
 906	u64 stime, utime;
 907
 908	int apm_idle_done = 0;
 909	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
 910	unsigned int bucket;
 911
 912recalc:
 913	task_cputime(current, &utime, &stime);
 914	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
 915		use_apm_idle = 0;
 916	} else if (jiffies_since_last_check > idle_period) {
 917		unsigned int idle_percentage;
 918
 919		idle_percentage = nsecs_to_jiffies(stime - last_stime);
 920		idle_percentage *= 100;
 921		idle_percentage /= jiffies_since_last_check;
 922		use_apm_idle = (idle_percentage > idle_threshold);
 923		if (apm_info.forbid_idle)
 924			use_apm_idle = 0;
 925	}
 926
 927	last_jiffies = jiffies;
 928	last_stime = stime;
 929
 930	bucket = IDLE_LEAKY_MAX;
 931
 932	while (!need_resched()) {
 933		if (use_apm_idle) {
 934			unsigned int t;
 935
 936			t = jiffies;
 937			switch (apm_do_idle()) {
 938			case 0:
 939				apm_idle_done = 1;
 940				if (t != jiffies) {
 941					if (bucket) {
 942						bucket = IDLE_LEAKY_MAX;
 943						continue;
 944					}
 945				} else if (bucket) {
 946					bucket--;
 947					continue;
 948				}
 949				break;
 950			case 1:
 951				apm_idle_done = 1;
 952				break;
 953			default: /* BIOS refused */
 954				break;
 955			}
 956		}
 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	return index;
 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		if (!call.err)
1044			return APM_NO_ERROR;
1045		return call.err;
1046	}
1047	*status = call.ebx;
1048	*bat = call.ecx;
1049	if (apm_info.get_power_status_swabinminutes) {
1050		*life = swab16((u16)call.edx);
1051		*life |= 0x8000;
1052	} else
1053		*life = call.edx;
1054	return APM_SUCCESS;
1055}
1056
1057#if 0
1058static int apm_get_battery_status(u_short which, u_short *status,
1059				  u_short *bat, u_short *life, u_short *nbat)
1060{
1061	u32 eax;
1062	u32 ebx;
1063	u32 ecx;
1064	u32 edx;
1065	u32 esi;
1066
1067	if (apm_info.connection_version < 0x0102) {
1068		/* pretend we only have one battery. */
1069		if (which != 1)
1070			return APM_BAD_DEVICE;
1071		*nbat = 1;
1072		return apm_get_power_status(status, bat, life);
1073	}
1074
1075	if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1076			  &ebx, &ecx, &edx, &esi))
1077		return (eax >> 8) & 0xff;
1078	*status = ebx;
1079	*bat = ecx;
1080	*life = edx;
1081	*nbat = esi;
1082	return APM_SUCCESS;
1083}
1084#endif
1085
1086/**
1087 *	apm_engage_power_management	-	enable PM on a device
1088 *	@device: identity of device
1089 *	@enable: on/off
1090 *
1091 *	Activate or deactivate power management on either a specific device
1092 *	or the entire system (%APM_DEVICE_ALL).
1093 */
1094
1095static int apm_engage_power_management(u_short device, int enable)
1096{
1097	u32 eax;
1098	int err;
1099
1100	if ((enable == 0) && (device == APM_DEVICE_ALL)
1101	    && (apm_info.bios.flags & APM_BIOS_DISABLED))
1102		return APM_DISABLED;
1103	if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1104				 &eax, &err))
1105		return err;
1106	if (device == APM_DEVICE_ALL) {
1107		if (enable)
1108			apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1109		else
1110			apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1111	}
1112	return APM_SUCCESS;
1113}
1114
1115#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1116
1117/**
1118 *	apm_console_blank	-	blank the display
1119 *	@blank: on/off
1120 *
1121 *	Attempt to blank the console, firstly by blanking just video device
1122 *	zero, and if that fails (some BIOSes don't support it) then it blanks
1123 *	all video devices. Typically the BIOS will do laptop backlight and
1124 *	monitor powerdown for us.
1125 */
1126
1127static int apm_console_blank(int blank)
1128{
1129	int error = APM_NOT_ENGAGED; /* silence gcc */
1130	int i;
1131	u_short state;
1132	static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1133
1134	state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1135
1136	for (i = 0; i < ARRAY_SIZE(dev); i++) {
1137		error = set_power_state(dev[i], state);
1138
1139		if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1140			return 1;
1141
1142		if (error == APM_NOT_ENGAGED)
1143			break;
1144	}
1145
1146	if (error == APM_NOT_ENGAGED) {
1147		static int tried;
1148		int eng_error;
1149		if (tried++ == 0) {
1150			eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1151			if (eng_error) {
1152				apm_error("set display", error);
1153				apm_error("engage interface", eng_error);
1154				return 0;
1155			} else
1156				return apm_console_blank(blank);
1157		}
1158	}
1159	apm_error("set display", error);
1160	return 0;
1161}
1162#endif
1163
1164static int queue_empty(struct apm_user *as)
1165{
1166	return as->event_head == as->event_tail;
1167}
1168
1169static apm_event_t get_queued_event(struct apm_user *as)
1170{
1171	if (++as->event_tail >= APM_MAX_EVENTS)
1172		as->event_tail = 0;
1173	return as->events[as->event_tail];
1174}
1175
1176static void queue_event(apm_event_t event, struct apm_user *sender)
1177{
1178	struct apm_user *as;
1179
1180	spin_lock(&user_list_lock);
1181	if (user_list == NULL)
1182		goto out;
1183	for (as = user_list; as != NULL; as = as->next) {
1184		if ((as == sender) || (!as->reader))
1185			continue;
1186		if (++as->event_head >= APM_MAX_EVENTS)
1187			as->event_head = 0;
1188
1189		if (as->event_head == as->event_tail) {
1190			static int notified;
1191
1192			if (notified++ == 0)
1193				pr_err("an event queue overflowed\n");
1194			if (++as->event_tail >= APM_MAX_EVENTS)
1195				as->event_tail = 0;
1196		}
1197		as->events[as->event_head] = event;
1198		if (!as->suser || !as->writer)
1199			continue;
1200		switch (event) {
1201		case APM_SYS_SUSPEND:
1202		case APM_USER_SUSPEND:
1203			as->suspends_pending++;
1204			suspends_pending++;
1205			break;
1206
1207		case APM_SYS_STANDBY:
1208		case APM_USER_STANDBY:
1209			as->standbys_pending++;
1210			standbys_pending++;
1211			break;
1212		}
1213	}
1214	wake_up_interruptible(&apm_waitqueue);
1215out:
1216	spin_unlock(&user_list_lock);
1217}
1218
1219static void reinit_timer(void)
1220{
1221#ifdef INIT_TIMER_AFTER_SUSPEND
1222	unsigned long flags;
1223
1224	raw_spin_lock_irqsave(&i8253_lock, flags);
1225	/* set the clock to HZ */
1226	outb_p(0x34, PIT_MODE);		/* binary, mode 2, LSB/MSB, ch 0 */
1227	udelay(10);
1228	outb_p(LATCH & 0xff, PIT_CH0);	/* LSB */
1229	udelay(10);
1230	outb_p(LATCH >> 8, PIT_CH0);	/* MSB */
1231	udelay(10);
1232	raw_spin_unlock_irqrestore(&i8253_lock, flags);
1233#endif
1234}
1235
1236static int suspend(int vetoable)
1237{
1238	int err;
1239	struct apm_user	*as;
1240
1241	dpm_suspend_start(PMSG_SUSPEND);
1242	dpm_suspend_end(PMSG_SUSPEND);
1243
1244	local_irq_disable();
1245	syscore_suspend();
1246
1247	local_irq_enable();
1248
1249	save_processor_state();
1250	err = set_system_power_state(APM_STATE_SUSPEND);
1251	ignore_normal_resume = 1;
1252	restore_processor_state();
1253
1254	local_irq_disable();
1255	reinit_timer();
1256
1257	if (err == APM_NO_ERROR)
1258		err = APM_SUCCESS;
1259	if (err != APM_SUCCESS)
1260		apm_error("suspend", err);
1261	err = (err == APM_SUCCESS) ? 0 : -EIO;
1262
1263	syscore_resume();
1264	local_irq_enable();
1265
1266	dpm_resume_start(PMSG_RESUME);
1267	dpm_resume_end(PMSG_RESUME);
1268
1269	queue_event(APM_NORMAL_RESUME, NULL);
1270	spin_lock(&user_list_lock);
1271	for (as = user_list; as != NULL; as = as->next) {
1272		as->suspend_wait = 0;
1273		as->suspend_result = err;
1274	}
1275	spin_unlock(&user_list_lock);
1276	wake_up_interruptible(&apm_suspend_waitqueue);
1277	return err;
1278}
1279
1280static void standby(void)
1281{
1282	int err;
1283
1284	dpm_suspend_end(PMSG_SUSPEND);
1285
1286	local_irq_disable();
1287	syscore_suspend();
1288	local_irq_enable();
1289
1290	err = set_system_power_state(APM_STATE_STANDBY);
1291	if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1292		apm_error("standby", err);
1293
1294	local_irq_disable();
1295	syscore_resume();
1296	local_irq_enable();
1297
1298	dpm_resume_start(PMSG_RESUME);
1299}
1300
1301static apm_event_t get_event(void)
1302{
1303	int error;
1304	apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1305	apm_eventinfo_t	info;
1306
1307	static int notified;
1308
1309	/* we don't use the eventinfo */
1310	error = apm_get_event(&event, &info);
1311	if (error == APM_SUCCESS)
1312		return event;
1313
1314	if ((error != APM_NO_EVENTS) && (notified++ == 0))
1315		apm_error("get_event", error);
1316
1317	return 0;
1318}
1319
1320static void check_events(void)
1321{
1322	apm_event_t event;
1323	static unsigned long last_resume;
1324	static int ignore_bounce;
1325
1326	while ((event = get_event()) != 0) {
1327		if (debug) {
1328			if (event <= NR_APM_EVENT_NAME)
1329				printk(KERN_DEBUG "apm: received %s notify\n",
1330				       apm_event_name[event - 1]);
1331			else
1332				printk(KERN_DEBUG "apm: received unknown "
1333				       "event 0x%02x\n", event);
1334		}
1335		if (ignore_bounce
1336		    && (time_after(jiffies, last_resume + bounce_interval)))
1337			ignore_bounce = 0;
1338
1339		switch (event) {
1340		case APM_SYS_STANDBY:
1341		case APM_USER_STANDBY:
1342			queue_event(event, NULL);
1343			if (standbys_pending <= 0)
1344				standby();
1345			break;
1346
1347		case APM_USER_SUSPEND:
1348#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1349			if (apm_info.connection_version > 0x100)
1350				set_system_power_state(APM_STATE_REJECT);
1351			break;
1352#endif
1353		case APM_SYS_SUSPEND:
1354			if (ignore_bounce) {
1355				if (apm_info.connection_version > 0x100)
1356					set_system_power_state(APM_STATE_REJECT);
1357				break;
1358			}
1359			/*
1360			 * If we are already processing a SUSPEND,
1361			 * then further SUSPEND events from the BIOS
1362			 * will be ignored.  We also return here to
1363			 * cope with the fact that the Thinkpads keep
1364			 * sending a SUSPEND event until something else
1365			 * happens!
1366			 */
1367			if (ignore_sys_suspend)
1368				return;
1369			ignore_sys_suspend = 1;
1370			queue_event(event, NULL);
1371			if (suspends_pending <= 0)
1372				(void) suspend(1);
1373			break;
1374
1375		case APM_NORMAL_RESUME:
1376		case APM_CRITICAL_RESUME:
1377		case APM_STANDBY_RESUME:
1378			ignore_sys_suspend = 0;
1379			last_resume = jiffies;
1380			ignore_bounce = 1;
1381			if ((event != APM_NORMAL_RESUME)
1382			    || (ignore_normal_resume == 0)) {
1383				dpm_resume_end(PMSG_RESUME);
1384				queue_event(event, NULL);
1385			}
1386			ignore_normal_resume = 0;
1387			break;
1388
1389		case APM_CAPABILITY_CHANGE:
1390		case APM_LOW_BATTERY:
1391		case APM_POWER_STATUS_CHANGE:
1392			queue_event(event, NULL);
1393			/* If needed, notify drivers here */
1394			break;
1395
1396		case APM_UPDATE_TIME:
1397			break;
1398
1399		case APM_CRITICAL_SUSPEND:
1400			/*
1401			 * We are not allowed to reject a critical suspend.
1402			 */
1403			(void)suspend(0);
1404			break;
1405		}
1406	}
1407}
1408
1409static void apm_event_handler(void)
1410{
1411	static int pending_count = 4;
1412	int err;
1413
1414	if ((standbys_pending > 0) || (suspends_pending > 0)) {
1415		if ((apm_info.connection_version > 0x100) &&
1416		    (pending_count-- <= 0)) {
1417			pending_count = 4;
1418			if (debug)
1419				printk(KERN_DEBUG "apm: setting state busy\n");
1420			err = set_system_power_state(APM_STATE_BUSY);
1421			if (err)
1422				apm_error("busy", err);
1423		}
1424	} else
1425		pending_count = 4;
1426	check_events();
1427}
1428
1429/*
1430 * This is the APM thread main loop.
1431 */
1432
1433static void apm_mainloop(void)
1434{
1435	DECLARE_WAITQUEUE(wait, current);
1436
1437	add_wait_queue(&apm_waitqueue, &wait);
1438	set_current_state(TASK_INTERRUPTIBLE);
1439	for (;;) {
1440		schedule_timeout(APM_CHECK_TIMEOUT);
1441		if (kthread_should_stop())
1442			break;
1443		/*
1444		 * Ok, check all events, check for idle (and mark us sleeping
1445		 * so as not to count towards the load average)..
1446		 */
1447		set_current_state(TASK_INTERRUPTIBLE);
1448		apm_event_handler();
1449	}
1450	remove_wait_queue(&apm_waitqueue, &wait);
1451}
1452
1453static int check_apm_user(struct apm_user *as, const char *func)
1454{
1455	if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1456		pr_err("%s passed bad filp\n", func);
1457		return 1;
1458	}
1459	return 0;
1460}
1461
1462static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1463{
1464	struct apm_user *as;
1465	int i;
1466	apm_event_t event;
1467
1468	as = fp->private_data;
1469	if (check_apm_user(as, "read"))
1470		return -EIO;
1471	if ((int)count < sizeof(apm_event_t))
1472		return -EINVAL;
1473	if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1474		return -EAGAIN;
1475	wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1476	i = count;
1477	while ((i >= sizeof(event)) && !queue_empty(as)) {
1478		event = get_queued_event(as);
1479		if (copy_to_user(buf, &event, sizeof(event))) {
1480			if (i < count)
1481				break;
1482			return -EFAULT;
1483		}
1484		switch (event) {
1485		case APM_SYS_SUSPEND:
1486		case APM_USER_SUSPEND:
1487			as->suspends_read++;
1488			break;
1489
1490		case APM_SYS_STANDBY:
1491		case APM_USER_STANDBY:
1492			as->standbys_read++;
1493			break;
1494		}
1495		buf += sizeof(event);
1496		i -= sizeof(event);
1497	}
1498	if (i < count)
1499		return count - i;
1500	if (signal_pending(current))
1501		return -ERESTARTSYS;
1502	return 0;
1503}
1504
1505static __poll_t do_poll(struct file *fp, poll_table *wait)
1506{
1507	struct apm_user *as;
1508
1509	as = fp->private_data;
1510	if (check_apm_user(as, "poll"))
1511		return 0;
1512	poll_wait(fp, &apm_waitqueue, wait);
1513	if (!queue_empty(as))
1514		return EPOLLIN | EPOLLRDNORM;
1515	return 0;
1516}
1517
1518static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1519{
1520	struct apm_user *as;
1521	int ret;
1522
1523	as = filp->private_data;
1524	if (check_apm_user(as, "ioctl"))
1525		return -EIO;
1526	if (!as->suser || !as->writer)
1527		return -EPERM;
1528	switch (cmd) {
1529	case APM_IOC_STANDBY:
1530		mutex_lock(&apm_mutex);
1531		if (as->standbys_read > 0) {
1532			as->standbys_read--;
1533			as->standbys_pending--;
1534			standbys_pending--;
1535		} else
1536			queue_event(APM_USER_STANDBY, as);
1537		if (standbys_pending <= 0)
1538			standby();
1539		mutex_unlock(&apm_mutex);
1540		break;
1541	case APM_IOC_SUSPEND:
1542		mutex_lock(&apm_mutex);
1543		if (as->suspends_read > 0) {
1544			as->suspends_read--;
1545			as->suspends_pending--;
1546			suspends_pending--;
1547		} else
1548			queue_event(APM_USER_SUSPEND, as);
1549		if (suspends_pending <= 0) {
1550			ret = suspend(1);
1551			mutex_unlock(&apm_mutex);
1552		} else {
1553			as->suspend_wait = 1;
1554			mutex_unlock(&apm_mutex);
1555			wait_event_interruptible(apm_suspend_waitqueue,
1556					as->suspend_wait == 0);
1557			ret = as->suspend_result;
1558		}
1559		return ret;
1560	default:
1561		return -ENOTTY;
1562	}
1563	return 0;
1564}
1565
1566static int do_release(struct inode *inode, struct file *filp)
1567{
1568	struct apm_user *as;
1569
1570	as = filp->private_data;
1571	if (check_apm_user(as, "release"))
1572		return 0;
1573	filp->private_data = NULL;
1574	if (as->standbys_pending > 0) {
1575		standbys_pending -= as->standbys_pending;
1576		if (standbys_pending <= 0)
1577			standby();
1578	}
1579	if (as->suspends_pending > 0) {
1580		suspends_pending -= as->suspends_pending;
1581		if (suspends_pending <= 0)
1582			(void) suspend(1);
1583	}
1584	spin_lock(&user_list_lock);
1585	if (user_list == as)
1586		user_list = as->next;
1587	else {
1588		struct apm_user *as1;
1589
1590		for (as1 = user_list;
1591		     (as1 != NULL) && (as1->next != as);
1592		     as1 = as1->next)
1593			;
1594		if (as1 == NULL)
1595			pr_err("filp not in user list\n");
1596		else
1597			as1->next = as->next;
1598	}
1599	spin_unlock(&user_list_lock);
1600	kfree(as);
1601	return 0;
1602}
1603
1604static int do_open(struct inode *inode, struct file *filp)
1605{
1606	struct apm_user *as;
1607
1608	as = kmalloc(sizeof(*as), GFP_KERNEL);
1609	if (as == NULL)
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
1634#ifdef CONFIG_PROC_FS
1635static int proc_apm_show(struct seq_file *m, void *v)
1636{
1637	unsigned short	bx;
1638	unsigned short	cx;
1639	unsigned short	dx;
1640	int		error;
1641	unsigned short  ac_line_status = 0xff;
1642	unsigned short  battery_status = 0xff;
1643	unsigned short  battery_flag   = 0xff;
1644	int		percentage     = -1;
1645	int             time_units     = -1;
1646	char            *units         = "?";
1647
1648	if ((num_online_cpus() == 1) &&
1649	    !(error = apm_get_power_status(&bx, &cx, &dx))) {
1650		ac_line_status = (bx >> 8) & 0xff;
1651		battery_status = bx & 0xff;
1652		if ((cx & 0xff) != 0xff)
1653			percentage = cx & 0xff;
1654
1655		if (apm_info.connection_version > 0x100) {
1656			battery_flag = (cx >> 8) & 0xff;
1657			if (dx != 0xffff) {
1658				units = (dx & 0x8000) ? "min" : "sec";
1659				time_units = dx & 0x7fff;
1660			}
1661		}
1662	}
1663	/* Arguments, with symbols from linux/apm_bios.h.  Information is
1664	   from the Get Power Status (0x0a) call unless otherwise noted.
1665
1666	   0) Linux driver version (this will change if format changes)
1667	   1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
1668	   2) APM flags from APM Installation Check (0x00):
1669	      bit 0: APM_16_BIT_SUPPORT
1670	      bit 1: APM_32_BIT_SUPPORT
1671	      bit 2: APM_IDLE_SLOWS_CLOCK
1672	      bit 3: APM_BIOS_DISABLED
1673	      bit 4: APM_BIOS_DISENGAGED
1674	   3) AC line status
1675	      0x00: Off-line
1676	      0x01: On-line
1677	      0x02: On backup power (BIOS >= 1.1 only)
1678	      0xff: Unknown
1679	   4) Battery status
1680	      0x00: High
1681	      0x01: Low
1682	      0x02: Critical
1683	      0x03: Charging
1684	      0x04: Selected battery not present (BIOS >= 1.2 only)
1685	      0xff: Unknown
1686	   5) Battery flag
1687	      bit 0: High
1688	      bit 1: Low
1689	      bit 2: Critical
1690	      bit 3: Charging
1691	      bit 7: No system battery
1692	      0xff: Unknown
1693	   6) Remaining battery life (percentage of charge):
1694	      0-100: valid
1695	      -1: Unknown
1696	   7) Remaining battery life (time units):
1697	      Number of remaining minutes or seconds
1698	      -1: Unknown
1699	   8) min = minutes; sec = seconds */
1700
1701	seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1702		   driver_version,
1703		   (apm_info.bios.version >> 8) & 0xff,
1704		   apm_info.bios.version & 0xff,
1705		   apm_info.bios.flags,
1706		   ac_line_status,
1707		   battery_status,
1708		   battery_flag,
1709		   percentage,
1710		   time_units,
1711		   units);
1712	return 0;
1713}
1714#endif
 
 
 
 
 
 
 
 
 
 
 
 
1715
1716static int apm(void *unused)
1717{
1718	unsigned short	bx;
1719	unsigned short	cx;
1720	unsigned short	dx;
1721	int		error;
1722	char 		*power_stat;
1723	char 		*bat_stat;
1724
1725	/* 2002/08/01 - WT
1726	 * This is to avoid random crashes at boot time during initialization
1727	 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1728	 * Some bioses don't like being called from CPU != 0.
1729	 * Method suggested by Ingo Molnar.
1730	 */
1731	set_cpus_allowed_ptr(current, cpumask_of(0));
1732	BUG_ON(smp_processor_id() != 0);
1733
1734	if (apm_info.connection_version == 0) {
1735		apm_info.connection_version = apm_info.bios.version;
1736		if (apm_info.connection_version > 0x100) {
1737			/*
1738			 * We only support BIOSs up to version 1.2
1739			 */
1740			if (apm_info.connection_version > 0x0102)
1741				apm_info.connection_version = 0x0102;
1742			error = apm_driver_version(&apm_info.connection_version);
1743			if (error != APM_SUCCESS) {
1744				apm_error("driver version", error);
1745				/* Fall back to an APM 1.0 connection. */
1746				apm_info.connection_version = 0x100;
1747			}
1748		}
1749	}
1750
1751	if (debug)
1752		printk(KERN_INFO "apm: Connection version %d.%d\n",
1753			(apm_info.connection_version >> 8) & 0xff,
1754			apm_info.connection_version & 0xff);
1755
1756#ifdef CONFIG_APM_DO_ENABLE
1757	if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1758		/*
1759		 * This call causes my NEC UltraLite Versa 33/C to hang if it
1760		 * is booted with PM disabled but not in the docking station.
1761		 * Unfortunate ...
1762		 */
1763		error = apm_enable_power_management(1);
1764		if (error) {
1765			apm_error("enable power management", error);
1766			return -1;
1767		}
1768	}
1769#endif
1770
1771	if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1772	    && (apm_info.connection_version > 0x0100)) {
1773		error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1774		if (error) {
1775			apm_error("engage power management", error);
1776			return -1;
1777		}
1778	}
1779
1780	if (debug && (num_online_cpus() == 1 || smp)) {
1781		error = apm_get_power_status(&bx, &cx, &dx);
1782		if (error)
1783			printk(KERN_INFO "apm: power status not available\n");
1784		else {
1785			switch ((bx >> 8) & 0xff) {
1786			case 0:
1787				power_stat = "off line";
1788				break;
1789			case 1:
1790				power_stat = "on line";
1791				break;
1792			case 2:
1793				power_stat = "on backup power";
1794				break;
1795			default:
1796				power_stat = "unknown";
1797				break;
1798			}
1799			switch (bx & 0xff) {
1800			case 0:
1801				bat_stat = "high";
1802				break;
1803			case 1:
1804				bat_stat = "low";
1805				break;
1806			case 2:
1807				bat_stat = "critical";
1808				break;
1809			case 3:
1810				bat_stat = "charging";
1811				break;
1812			default:
1813				bat_stat = "unknown";
1814				break;
1815			}
1816			printk(KERN_INFO
1817			       "apm: AC %s, battery status %s, battery life ",
1818			       power_stat, bat_stat);
1819			if ((cx & 0xff) == 0xff)
1820				printk("unknown\n");
1821			else
1822				printk("%d%%\n", cx & 0xff);
1823			if (apm_info.connection_version > 0x100) {
1824				printk(KERN_INFO
1825				       "apm: battery flag 0x%02x, battery life ",
1826				       (cx >> 8) & 0xff);
1827				if (dx == 0xffff)
1828					printk("unknown\n");
1829				else
1830					printk("%d %s\n", dx & 0x7fff,
1831					       (dx & 0x8000) ?
1832					       "minutes" : "seconds");
1833			}
1834		}
1835	}
1836
1837	/* Install our power off handler.. */
1838	if (power_off)
1839		pm_power_off = apm_power_off;
1840
1841	if (num_online_cpus() == 1 || smp) {
1842#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1843		console_blank_hook = apm_console_blank;
1844#endif
1845		apm_mainloop();
1846#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1847		console_blank_hook = NULL;
1848#endif
1849	}
1850
1851	return 0;
1852}
1853
1854#ifndef MODULE
1855static int __init apm_setup(char *str)
1856{
1857	int invert;
1858
1859	while ((str != NULL) && (*str != '\0')) {
1860		if (strncmp(str, "off", 3) == 0)
1861			apm_disabled = 1;
1862		if (strncmp(str, "on", 2) == 0)
1863			apm_disabled = 0;
1864		if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1865		    (strncmp(str, "bounce_interval=", 16) == 0))
1866			bounce_interval = simple_strtol(str + 16, NULL, 0);
1867		if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1868		    (strncmp(str, "idle_threshold=", 15) == 0))
1869			idle_threshold = simple_strtol(str + 15, NULL, 0);
1870		if ((strncmp(str, "idle-period=", 12) == 0) ||
1871		    (strncmp(str, "idle_period=", 12) == 0))
1872			idle_period = simple_strtol(str + 12, NULL, 0);
1873		invert = (strncmp(str, "no-", 3) == 0) ||
1874			(strncmp(str, "no_", 3) == 0);
1875		if (invert)
1876			str += 3;
1877		if (strncmp(str, "debug", 5) == 0)
1878			debug = !invert;
1879		if ((strncmp(str, "power-off", 9) == 0) ||
1880		    (strncmp(str, "power_off", 9) == 0))
1881			power_off = !invert;
1882		if (strncmp(str, "smp", 3) == 0) {
1883			smp = !invert;
1884			idle_threshold = 100;
1885		}
1886		if ((strncmp(str, "allow-ints", 10) == 0) ||
1887		    (strncmp(str, "allow_ints", 10) == 0))
1888			apm_info.allow_ints = !invert;
1889		if ((strncmp(str, "broken-psr", 10) == 0) ||
1890		    (strncmp(str, "broken_psr", 10) == 0))
1891			apm_info.get_power_status_broken = !invert;
1892		if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1893		    (strncmp(str, "realmode_power_off", 18) == 0))
1894			apm_info.realmode_power_off = !invert;
1895		str = strchr(str, ',');
1896		if (str != NULL)
1897			str += strspn(str, ", \t");
1898	}
1899	return 1;
1900}
1901
1902__setup("apm=", apm_setup);
1903#endif
1904
1905static const struct file_operations apm_bios_fops = {
1906	.owner		= THIS_MODULE,
1907	.read		= do_read,
1908	.poll		= do_poll,
1909	.unlocked_ioctl	= do_ioctl,
1910	.open		= do_open,
1911	.release	= do_release,
1912	.llseek		= noop_llseek,
1913};
1914
1915static struct miscdevice apm_device = {
1916	APM_MINOR_DEV,
1917	"apm_bios",
1918	&apm_bios_fops
1919};
1920
1921
1922/* Simple "print if true" callback */
1923static int __init print_if_true(const struct dmi_system_id *d)
1924{
1925	printk("%s\n", d->ident);
1926	return 0;
1927}
1928
1929/*
1930 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1931 * disabled before the suspend. Linux used to get terribly confused by that.
1932 */
1933static int __init broken_ps2_resume(const struct dmi_system_id *d)
1934{
1935	printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1936	       "workaround hopefully not needed.\n", d->ident);
1937	return 0;
1938}
1939
1940/* Some bioses have a broken protected mode poweroff and need to use realmode */
1941static int __init set_realmode_power_off(const struct dmi_system_id *d)
1942{
1943	if (apm_info.realmode_power_off == 0) {
1944		apm_info.realmode_power_off = 1;
1945		printk(KERN_INFO "%s bios detected. "
1946		       "Using realmode poweroff only.\n", d->ident);
1947	}
1948	return 0;
1949}
1950
1951/* Some laptops require interrupts to be enabled during APM calls */
1952static int __init set_apm_ints(const struct dmi_system_id *d)
1953{
1954	if (apm_info.allow_ints == 0) {
1955		apm_info.allow_ints = 1;
1956		printk(KERN_INFO "%s machine detected. "
1957		       "Enabling interrupts during APM calls.\n", d->ident);
1958	}
1959	return 0;
1960}
1961
1962/* Some APM bioses corrupt memory or just plain do not work */
1963static int __init apm_is_horked(const struct dmi_system_id *d)
1964{
1965	if (apm_info.disabled == 0) {
1966		apm_info.disabled = 1;
1967		printk(KERN_INFO "%s machine detected. "
1968		       "Disabling APM.\n", d->ident);
1969	}
1970	return 0;
1971}
1972
1973static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1974{
1975	if (apm_info.disabled == 0) {
1976		apm_info.disabled = 1;
1977		printk(KERN_INFO "%s machine detected. "
1978		       "Disabling APM.\n", d->ident);
1979		printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1980		printk(KERN_INFO "download from support.intel.com\n");
1981	}
1982	return 0;
1983}
1984
1985/* Some APM bioses hang on APM idle calls */
1986static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1987{
1988	if (apm_info.forbid_idle == 0) {
1989		apm_info.forbid_idle = 1;
1990		printk(KERN_INFO "%s machine detected. "
1991		       "Disabling APM idle calls.\n", d->ident);
1992	}
1993	return 0;
1994}
1995
1996/*
1997 *  Check for clue free BIOS implementations who use
1998 *  the following QA technique
1999 *
2000 *      [ Write BIOS Code ]<------
2001 *               |                ^
2002 *      < Does it Compile >----N--
2003 *               |Y               ^
2004 *	< Does it Boot Win98 >-N--
2005 *               |Y
2006 *           [Ship It]
2007 *
2008 *	Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
2009 *	Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
2010 */
2011static int __init broken_apm_power(const struct dmi_system_id *d)
2012{
2013	apm_info.get_power_status_broken = 1;
2014	printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2015	       "disabling power status reporting.\n");
2016	return 0;
2017}
2018
2019/*
2020 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2021 * have this problem).
2022 */
2023static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2024{
2025	apm_info.get_power_status_swabinminutes = 1;
2026	printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2027	       "in minutes and wrong byte order.\n");
2028	return 0;
2029}
2030
2031static const struct dmi_system_id apm_dmi_table[] __initconst = {
2032	{
2033		print_if_true,
2034		KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2035		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2036			DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2037	},
2038	{	/* Handle problems with APM on the C600 */
2039		broken_ps2_resume, "Dell Latitude C600",
2040		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2041			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2042	},
2043	{	/* Allow interrupts during suspend on Dell Latitude laptops*/
2044		set_apm_ints, "Dell Latitude",
2045		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2046			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2047	},
2048	{	/* APM crashes */
2049		apm_is_horked, "Dell Inspiron 2500",
2050		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2051			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2052			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2053			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2054	},
2055	{	/* Allow interrupts during suspend on Dell Inspiron laptops*/
2056		set_apm_ints, "Dell Inspiron", {
2057			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2058			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2059	},
2060	{	/* Handle problems with APM on Inspiron 5000e */
2061		broken_apm_power, "Dell Inspiron 5000e",
2062		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2063			DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2064			DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2065	},
2066	{	/* Handle problems with APM on Inspiron 2500 */
2067		broken_apm_power, "Dell Inspiron 2500",
2068		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2069			DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2070			DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2071	},
2072	{	/* APM crashes */
2073		apm_is_horked, "Dell Dimension 4100",
2074		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2075			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2076			DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2077			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2078	},
2079	{	/* Allow interrupts during suspend on Compaq Laptops*/
2080		set_apm_ints, "Compaq 12XL125",
2081		{	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2082			DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2083			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2084			DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2085	},
2086	{	/* Allow interrupts during APM or the clock goes slow */
2087		set_apm_ints, "ASUSTeK",
2088		{	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2089			DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2090	},
2091	{	/* APM blows on shutdown */
2092		apm_is_horked, "ABIT KX7-333[R]",
2093		{	DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2094			DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2095	},
2096	{	/* APM crashes */
2097		apm_is_horked, "Trigem Delhi3",
2098		{	DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2099			DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2100	},
2101	{	/* APM crashes */
2102		apm_is_horked, "Fujitsu-Siemens",
2103		{	DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2104			DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2105	},
2106	{	/* APM crashes */
2107		apm_is_horked_d850md, "Intel D850MD",
2108		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2109			DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2110	},
2111	{	/* APM crashes */
2112		apm_is_horked, "Intel D810EMO",
2113		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2114			DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2115	},
2116	{	/* APM crashes */
2117		apm_is_horked, "Dell XPS-Z",
2118		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2119			DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2120			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2121	},
2122	{	/* APM crashes */
2123		apm_is_horked, "Sharp PC-PJ/AX",
2124		{	DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2125			DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2126			DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2127			DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2128	},
2129	{	/* APM crashes */
2130		apm_is_horked, "Dell Inspiron 2500",
2131		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2132			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2133			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2134			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2135	},
2136	{	/* APM idle hangs */
2137		apm_likes_to_melt, "Jabil AMD",
2138		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2139			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2140	},
2141	{	/* APM idle hangs */
2142		apm_likes_to_melt, "AMI Bios",
2143		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2144			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2145	},
2146	{	/* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2147		swab_apm_power_in_minutes, "Sony VAIO",
2148		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2149			DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2150			DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2151	},
2152	{	/* Handle problems with APM on Sony Vaio PCG-N505VX */
2153		swab_apm_power_in_minutes, "Sony VAIO",
2154		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2155			DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2156			DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2157	},
2158	{	/* Handle problems with APM on Sony Vaio PCG-XG29 */
2159		swab_apm_power_in_minutes, "Sony VAIO",
2160		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2161			DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2162			DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2163	},
2164	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2165		swab_apm_power_in_minutes, "Sony VAIO",
2166		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2167			DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2168			DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2169	},
2170	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2171		swab_apm_power_in_minutes, "Sony VAIO",
2172		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2173			DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2174			DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2175	},
2176	{	/* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2177		swab_apm_power_in_minutes, "Sony VAIO",
2178		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2179			DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2180			DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2181	},
2182	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2183		swab_apm_power_in_minutes, "Sony VAIO",
2184		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2185			DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2186			DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2187	},
2188	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2189		swab_apm_power_in_minutes, "Sony VAIO",
2190		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2191			DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2192			DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2193	},
2194	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2195		swab_apm_power_in_minutes, "Sony VAIO",
2196		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2197			DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2198			DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2199	},
2200	{	/* Handle problems with APM on Sony Vaio PCG-F104K */
2201		swab_apm_power_in_minutes, "Sony VAIO",
2202		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2203			DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2204			DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2205	},
2206
2207	{	/* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2208		swab_apm_power_in_minutes, "Sony VAIO",
2209		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2210			DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2211			DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2212	},
2213	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2214		swab_apm_power_in_minutes, "Sony VAIO",
2215		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2216			DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2217			DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2218	},
2219	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2220		swab_apm_power_in_minutes, "Sony VAIO",
2221		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2222			DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2223			DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2224	},
2225	{	/* broken PM poweroff bios */
2226		set_realmode_power_off, "Award Software v4.60 PGMA",
2227		{	DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2228			DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2229			DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2230	},
2231
2232	/* Generic per vendor APM settings  */
2233
2234	{	/* Allow interrupts during suspend on IBM laptops */
2235		set_apm_ints, "IBM",
2236		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2237	},
2238
2239	{ }
2240};
2241
2242/*
2243 * Just start the APM thread. We do NOT want to do APM BIOS
2244 * calls from anything but the APM thread, if for no other reason
2245 * than the fact that we don't trust the APM BIOS. This way,
2246 * most common APM BIOS problems that lead to protection errors
2247 * etc will have at least some level of being contained...
2248 *
2249 * In short, if something bad happens, at least we have a choice
2250 * of just killing the apm thread..
2251 */
2252static int __init apm_init(void)
2253{
2254	struct desc_struct *gdt;
2255	int err;
2256
2257	dmi_check_system(apm_dmi_table);
2258
2259	if (apm_info.bios.version == 0 || machine_is_olpc()) {
2260		printk(KERN_INFO "apm: BIOS not found.\n");
2261		return -ENODEV;
2262	}
2263	printk(KERN_INFO
2264	       "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2265	       ((apm_info.bios.version >> 8) & 0xff),
2266	       (apm_info.bios.version & 0xff),
2267	       apm_info.bios.flags,
2268	       driver_version);
2269	if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2270		printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2271		return -ENODEV;
2272	}
2273
2274	if (allow_ints)
2275		apm_info.allow_ints = 1;
2276	if (broken_psr)
2277		apm_info.get_power_status_broken = 1;
2278	if (realmode_power_off)
2279		apm_info.realmode_power_off = 1;
2280	/* User can override, but default is to trust DMI */
2281	if (apm_disabled != -1)
2282		apm_info.disabled = apm_disabled;
2283
2284	/*
2285	 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2286	 * but is reportedly a 1.0 BIOS.
2287	 */
2288	if (apm_info.bios.version == 0x001)
2289		apm_info.bios.version = 0x100;
2290
2291	/* BIOS < 1.2 doesn't set cseg_16_len */
2292	if (apm_info.bios.version < 0x102)
2293		apm_info.bios.cseg_16_len = 0; /* 64k */
2294
2295	if (debug) {
2296		printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2297			apm_info.bios.cseg, apm_info.bios.offset,
2298			apm_info.bios.cseg_16, apm_info.bios.dseg);
2299		if (apm_info.bios.version > 0x100)
2300			printk(" cseg len %x, dseg len %x",
2301				apm_info.bios.cseg_len,
2302				apm_info.bios.dseg_len);
2303		if (apm_info.bios.version > 0x101)
2304			printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2305		printk("\n");
2306	}
2307
2308	if (apm_info.disabled) {
2309		pr_notice("disabled on user request.\n");
2310		return -ENODEV;
2311	}
2312	if ((num_online_cpus() > 1) && !power_off && !smp) {
2313		pr_notice("disabled - APM is not SMP safe.\n");
2314		apm_info.disabled = 1;
2315		return -ENODEV;
2316	}
2317	if (!acpi_disabled) {
2318		pr_notice("overridden by ACPI.\n");
2319		apm_info.disabled = 1;
2320		return -ENODEV;
2321	}
2322
2323	/*
2324	 * Set up the long jump entry point to the APM BIOS, which is called
2325	 * from inline assembly.
2326	 */
2327	apm_bios_entry.offset = apm_info.bios.offset;
2328	apm_bios_entry.segment = APM_CS;
2329
2330	/*
2331	 * The APM 1.1 BIOS is supposed to provide limit information that it
2332	 * recognizes.  Many machines do this correctly, but many others do
2333	 * not restrict themselves to their claimed limit.  When this happens,
2334	 * they will cause a segmentation violation in the kernel at boot time.
2335	 * Most BIOS's, however, will respect a 64k limit, so we use that.
2336	 *
2337	 * Note we only set APM segments on CPU zero, since we pin the APM
2338	 * code to that CPU.
2339	 */
2340	gdt = get_cpu_gdt_rw(0);
2341	set_desc_base(&gdt[APM_CS >> 3],
2342		 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2343	set_desc_base(&gdt[APM_CS_16 >> 3],
2344		 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2345	set_desc_base(&gdt[APM_DS >> 3],
2346		 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2347
2348	proc_create_single("apm", 0, NULL, proc_apm_show);
2349
2350	kapmd_task = kthread_create(apm, NULL, "kapmd");
2351	if (IS_ERR(kapmd_task)) {
2352		pr_err("disabled - Unable to start kernel thread\n");
2353		err = PTR_ERR(kapmd_task);
2354		kapmd_task = NULL;
2355		remove_proc_entry("apm", NULL);
2356		return err;
2357	}
2358	wake_up_process(kapmd_task);
2359
2360	if (num_online_cpus() > 1 && !smp) {
2361		printk(KERN_NOTICE
2362		       "apm: disabled - APM is not SMP safe (power off active).\n");
2363		return 0;
2364	}
2365
2366	/*
2367	 * Note we don't actually care if the misc_device cannot be registered.
2368	 * this driver can do its job without it, even if userspace can't
2369	 * control it.  just log the error
2370	 */
2371	if (misc_register(&apm_device))
2372		printk(KERN_WARNING "apm: Could not register misc device.\n");
2373
2374	if (HZ != 100)
2375		idle_period = (idle_period * HZ) / 100;
2376	if (idle_threshold < 100) {
2377		cpuidle_poll_state_init(&apm_idle_driver);
2378		if (!cpuidle_register_driver(&apm_idle_driver))
2379			if (cpuidle_register_device(&apm_cpuidle_device))
2380				cpuidle_unregister_driver(&apm_idle_driver);
2381	}
2382
2383	return 0;
2384}
2385
2386static void __exit apm_exit(void)
2387{
2388	int error;
2389
2390	cpuidle_unregister_device(&apm_cpuidle_device);
2391	cpuidle_unregister_driver(&apm_idle_driver);
2392
2393	if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2394	    && (apm_info.connection_version > 0x0100)) {
2395		error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2396		if (error)
2397			apm_error("disengage power management", error);
2398	}
2399	misc_deregister(&apm_device);
2400	remove_proc_entry("apm", NULL);
2401	if (power_off)
2402		pm_power_off = NULL;
2403	if (kapmd_task) {
2404		kthread_stop(kapmd_task);
2405		kapmd_task = NULL;
2406	}
2407}
2408
2409module_init(apm_init);
2410module_exit(apm_exit);
2411
2412MODULE_AUTHOR("Stephen Rothwell");
2413MODULE_DESCRIPTION("Advanced Power Management");
2414MODULE_LICENSE("GPL");
2415module_param(debug, bool, 0644);
2416MODULE_PARM_DESC(debug, "Enable debug mode");
2417module_param(power_off, bool, 0444);
2418MODULE_PARM_DESC(power_off, "Enable power off");
2419module_param(bounce_interval, int, 0444);
2420MODULE_PARM_DESC(bounce_interval,
2421		"Set the number of ticks to ignore suspend bounces");
2422module_param(allow_ints, bool, 0444);
2423MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2424module_param(broken_psr, bool, 0444);
2425MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2426module_param(realmode_power_off, bool, 0444);
2427MODULE_PARM_DESC(realmode_power_off,
2428		"Switch to real mode before powering off");
2429module_param(idle_threshold, int, 0444);
2430MODULE_PARM_DESC(idle_threshold,
2431	"System idle percentage above which to make APM BIOS idle calls");
2432module_param(idle_period, int, 0444);
2433MODULE_PARM_DESC(idle_period,
2434	"Period (in sec/100) over which to calculate the idle percentage");
2435module_param(smp, bool, 0444);
2436MODULE_PARM_DESC(smp,
2437	"Set this to enable APM use on an SMP platform. Use with caution on older systems");
2438MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
v4.10.11
 
   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.h>
 
 222#include <linux/pm.h>
 223#include <linux/capability.h>
 224#include <linux/device.h>
 225#include <linux/kernel.h>
 226#include <linux/freezer.h>
 227#include <linux/smp.h>
 228#include <linux/dmi.h>
 229#include <linux/suspend.h>
 230#include <linux/kthread.h>
 231#include <linux/jiffies.h>
 232#include <linux/acpi.h>
 233#include <linux/syscore_ops.h>
 234#include <linux/i8253.h>
 235#include <linux/cpuidle.h>
 236
 237#include <linux/uaccess.h>
 238#include <asm/desc.h>
 239#include <asm/olpc.h>
 240#include <asm/paravirt.h>
 241#include <asm/reboot.h>
 
 242
 243#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
 244extern int (*console_blank_hook)(int);
 245#endif
 246
 247/*
 248 * The apm_bios device is one of the misc char devices.
 249 * This is its minor number.
 250 */
 251#define	APM_MINOR_DEV	134
 252
 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#define DEFAULT_IDLE_THRESHOLD	95
 365#else
 366#define DEFAULT_IDLE_THRESHOLD	100
 367#endif
 368#define DEFAULT_IDLE_PERIOD	(100 / 3)
 369
 370static int apm_cpu_idle(struct cpuidle_device *dev,
 371			struct cpuidle_driver *drv, int index);
 372
 373static struct cpuidle_driver apm_idle_driver = {
 374	.name = "apm_idle",
 375	.owner = THIS_MODULE,
 376	.states = {
 377		{ /* entry 0 is for polling */ },
 378		{ /* entry 1 is for APM idle */
 379			.name = "APM",
 380			.desc = "APM idle",
 381			.exit_latency = 250,	/* WAG */
 382			.target_residency = 500,	/* WAG */
 383			.enter = &apm_cpu_idle
 384		},
 385	},
 386	.state_count = 2,
 387};
 388
 389static struct cpuidle_device apm_cpuidle_device;
 390
 391/*
 392 * Local variables
 393 */
 394__visible struct {
 395	unsigned long	offset;
 396	unsigned short	segment;
 397} apm_bios_entry;
 398static int clock_slowed;
 399static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
 400static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
 401static int suspends_pending;
 402static int standbys_pending;
 403static int ignore_sys_suspend;
 404static int ignore_normal_resume;
 405static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
 406
 407static bool debug __read_mostly;
 408static bool smp __read_mostly;
 409static int apm_disabled = -1;
 410#ifdef CONFIG_SMP
 411static bool power_off;
 412#else
 413static bool power_off = 1;
 414#endif
 415static bool realmode_power_off;
 416#ifdef CONFIG_APM_ALLOW_INTS
 417static bool allow_ints = 1;
 418#else
 419static bool allow_ints;
 420#endif
 421static bool broken_psr;
 422
 423static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
 424static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
 425static struct apm_user *user_list;
 426static DEFINE_SPINLOCK(user_list_lock);
 427static DEFINE_MUTEX(apm_mutex);
 428
 429/*
 430 * Set up a segment that references the real mode segment 0x40
 431 * that extends up to the end of page zero (that we have reserved).
 432 * This is for buggy BIOS's that refer to (real mode) segment 0x40
 433 * even though they are called in protected mode.
 434 */
 435static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
 436			(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
 437
 438static const char driver_version[] = "1.16ac";	/* no spaces */
 439
 440static struct task_struct *kapmd_task;
 441
 442/*
 443 *	APM event names taken from the APM 1.2 specification. These are
 444 *	the message codes that the BIOS uses to tell us about events
 445 */
 446static const char * const apm_event_name[] = {
 447	"system standby",
 448	"system suspend",
 449	"normal resume",
 450	"critical resume",
 451	"low battery",
 452	"power status change",
 453	"update time",
 454	"critical suspend",
 455	"user standby",
 456	"user suspend",
 457	"system standby resume",
 458	"capabilities change"
 459};
 460#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
 461
 462typedef struct lookup_t {
 463	int	key;
 464	char 	*msg;
 465} lookup_t;
 466
 467/*
 468 *	The BIOS returns a set of standard error codes in AX when the
 469 *	carry flag is set.
 470 */
 471
 472static const lookup_t error_table[] = {
 473/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
 474	{ APM_DISABLED,		"Power management disabled" },
 475	{ APM_CONNECTED,	"Real mode interface already connected" },
 476	{ APM_NOT_CONNECTED,	"Interface not connected" },
 477	{ APM_16_CONNECTED,	"16 bit interface already connected" },
 478/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
 479	{ APM_32_CONNECTED,	"32 bit interface already connected" },
 480	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
 481	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
 482	{ APM_BAD_PARAM,	"Parameter out of range" },
 483	{ APM_NOT_ENGAGED,	"Interface not engaged" },
 484	{ APM_BAD_FUNCTION,     "Function not supported" },
 485	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
 486	{ APM_BAD_STATE,	"Unable to enter requested state" },
 487/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
 488	{ APM_NO_ERROR,		"BIOS did not set a return code" },
 489	{ APM_NOT_PRESENT,	"No APM present" }
 490};
 491#define ERROR_COUNT	ARRAY_SIZE(error_table)
 492
 493/**
 494 *	apm_error	-	display an APM error
 495 *	@str: information string
 496 *	@err: APM BIOS return code
 497 *
 498 *	Write a meaningful log entry to the kernel log in the event of
 499 *	an APM error.  Note that this also handles (negative) kernel errors.
 500 */
 501
 502static void apm_error(char *str, int err)
 503{
 504	int i;
 505
 506	for (i = 0; i < ERROR_COUNT; i++)
 507		if (error_table[i].key == err)
 508			break;
 509	if (i < ERROR_COUNT)
 510		pr_notice("%s: %s\n", str, error_table[i].msg);
 511	else if (err < 0)
 512		pr_notice("%s: linux error code %i\n", str, err);
 513	else
 514		pr_notice("%s: unknown error code %#2.2x\n",
 515		       str, err);
 516}
 517
 518/*
 519 * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
 520 * apm_info.allow_ints, we are being really paranoid here!  Not only
 521 * are interrupts disabled, but all the segment registers (except SS)
 522 * are saved and zeroed this means that if the BIOS tries to reference
 523 * any data without explicitly loading the segment registers, the kernel
 524 * will fault immediately rather than have some unforeseen circumstances
 525 * for the rest of the kernel.  And it will be very obvious!  :-) Doing
 526 * this depends on CS referring to the same physical memory as DS so that
 527 * DS can be zeroed before the call. Unfortunately, we can't do anything
 528 * about the stack segment/pointer.  Also, we tell the compiler that
 529 * everything could change.
 530 *
 531 * Also, we KNOW that for the non error case of apm_bios_call, there
 532 * is no useful data returned in the low order 8 bits of eax.
 533 */
 534
 535static inline unsigned long __apm_irq_save(void)
 536{
 537	unsigned long flags;
 538	local_save_flags(flags);
 539	if (apm_info.allow_ints) {
 540		if (irqs_disabled_flags(flags))
 541			local_irq_enable();
 542	} else
 543		local_irq_disable();
 544
 545	return flags;
 546}
 547
 548#define apm_irq_save(flags) \
 549	do { flags = __apm_irq_save(); } while (0)
 550
 551static inline void apm_irq_restore(unsigned long flags)
 552{
 553	if (irqs_disabled_flags(flags))
 554		local_irq_disable();
 555	else if (irqs_disabled())
 556		local_irq_enable();
 557}
 558
 559#ifdef APM_ZERO_SEGS
 560#	define APM_DECL_SEGS \
 561		unsigned int saved_fs; unsigned int saved_gs;
 562#	define APM_DO_SAVE_SEGS \
 563		savesegment(fs, saved_fs); savesegment(gs, saved_gs)
 564#	define APM_DO_RESTORE_SEGS \
 565		loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
 566#else
 567#	define APM_DECL_SEGS
 568#	define APM_DO_SAVE_SEGS
 569#	define APM_DO_RESTORE_SEGS
 570#endif
 571
 572struct apm_bios_call {
 573	u32 func;
 574	/* In and out */
 575	u32 ebx;
 576	u32 ecx;
 577	/* Out only */
 578	u32 eax;
 579	u32 edx;
 580	u32 esi;
 581
 582	/* Error: -ENOMEM, or bits 8-15 of eax */
 583	int err;
 584};
 585
 586/**
 587 *	__apm_bios_call - Make an APM BIOS 32bit call
 588 *	@_call: pointer to struct apm_bios_call.
 589 *
 590 *	Make an APM call using the 32bit protected mode interface. The
 591 *	caller is responsible for knowing if APM BIOS is configured and
 592 *	enabled. This call can disable interrupts for a long period of
 593 *	time on some laptops.  The return value is in AH and the carry
 594 *	flag is loaded into AL.  If there is an error, then the error
 595 *	code is returned in AH (bits 8-15 of eax) and this function
 596 *	returns non-zero.
 597 *
 598 *	Note: this makes the call on the current CPU.
 599 */
 600static long __apm_bios_call(void *_call)
 601{
 602	APM_DECL_SEGS
 603	unsigned long		flags;
 604	int			cpu;
 605	struct desc_struct	save_desc_40;
 606	struct desc_struct	*gdt;
 607	struct apm_bios_call	*call = _call;
 608
 609	cpu = get_cpu();
 610	BUG_ON(cpu != 0);
 611	gdt = get_cpu_gdt_table(cpu);
 612	save_desc_40 = gdt[0x40 / 8];
 613	gdt[0x40 / 8] = bad_bios_desc;
 614
 615	apm_irq_save(flags);
 
 616	APM_DO_SAVE_SEGS;
 617	apm_bios_call_asm(call->func, call->ebx, call->ecx,
 618			  &call->eax, &call->ebx, &call->ecx, &call->edx,
 619			  &call->esi);
 620	APM_DO_RESTORE_SEGS;
 
 621	apm_irq_restore(flags);
 622	gdt[0x40 / 8] = save_desc_40;
 623	put_cpu();
 624
 625	return call->eax & 0xff;
 626}
 627
 628/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
 629static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
 630{
 631	int ret;
 632
 633	/* Don't bother with work_on_cpu in the common case, so we don't
 634	 * have to worry about OOM or overhead. */
 635	if (get_cpu() == 0) {
 636		ret = fn(call);
 637		put_cpu();
 638	} else {
 639		put_cpu();
 640		ret = work_on_cpu(0, fn, call);
 641	}
 642
 643	/* work_on_cpu can fail with -ENOMEM */
 644	if (ret < 0)
 645		call->err = ret;
 646	else
 647		call->err = (call->eax >> 8) & 0xff;
 648
 649	return ret;
 650}
 651
 652/**
 653 *	apm_bios_call	-	Make an APM BIOS 32bit call (on CPU 0)
 654 *	@call: the apm_bios_call registers.
 655 *
 656 *	If there is an error, it is returned in @call.err.
 657 */
 658static int apm_bios_call(struct apm_bios_call *call)
 659{
 660	return on_cpu0(__apm_bios_call, call);
 661}
 662
 663/**
 664 *	__apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
 665 *	@_call: pointer to struct apm_bios_call.
 666 *
 667 *	Make a BIOS call that returns one value only, or just status.
 668 *	If there is an error, then the error code is returned in AH
 669 *	(bits 8-15 of eax) and this function returns non-zero (it can
 670 *	also return -ENOMEM). This is used for simpler BIOS operations.
 671 *	This call may hold interrupts off for a long time on some laptops.
 672 *
 673 *	Note: this makes the call on the current CPU.
 674 */
 675static long __apm_bios_call_simple(void *_call)
 676{
 677	u8			error;
 678	APM_DECL_SEGS
 679	unsigned long		flags;
 680	int			cpu;
 681	struct desc_struct	save_desc_40;
 682	struct desc_struct	*gdt;
 683	struct apm_bios_call	*call = _call;
 684
 685	cpu = get_cpu();
 686	BUG_ON(cpu != 0);
 687	gdt = get_cpu_gdt_table(cpu);
 688	save_desc_40 = gdt[0x40 / 8];
 689	gdt[0x40 / 8] = bad_bios_desc;
 690
 691	apm_irq_save(flags);
 
 692	APM_DO_SAVE_SEGS;
 693	error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
 694					 &call->eax);
 695	APM_DO_RESTORE_SEGS;
 
 696	apm_irq_restore(flags);
 697	gdt[0x40 / 8] = save_desc_40;
 698	put_cpu();
 699	return error;
 700}
 701
 702/**
 703 *	apm_bios_call_simple	-	make a simple APM BIOS 32bit call
 704 *	@func: APM function to invoke
 705 *	@ebx_in: EBX register value for BIOS call
 706 *	@ecx_in: ECX register value for BIOS call
 707 *	@eax: EAX register on return from the BIOS call
 708 *	@err: bits
 709 *
 710 *	Make a BIOS call that returns one value only, or just status.
 711 *	If there is an error, then the error code is returned in @err
 712 *	and this function returns non-zero. This is used for simpler
 713 *	BIOS operations.  This call may hold interrupts off for a long
 714 *	time on some laptops.
 715 */
 716static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
 717				int *err)
 718{
 719	struct apm_bios_call call;
 720	int ret;
 721
 722	call.func = func;
 723	call.ebx = ebx_in;
 724	call.ecx = ecx_in;
 725
 726	ret = on_cpu0(__apm_bios_call_simple, &call);
 727	*eax = call.eax;
 728	*err = call.err;
 729	return ret;
 730}
 731
 732/**
 733 *	apm_driver_version	-	APM driver version
 734 *	@val:	loaded with the APM version on return
 735 *
 736 *	Retrieve the APM version supported by the BIOS. This is only
 737 *	supported for APM 1.1 or higher. An error indicates APM 1.0 is
 738 *	probably present.
 739 *
 740 *	On entry val should point to a value indicating the APM driver
 741 *	version with the high byte being the major and the low byte the
 742 *	minor number both in BCD
 743 *
 744 *	On return it will hold the BIOS revision supported in the
 745 *	same format.
 746 */
 747
 748static int apm_driver_version(u_short *val)
 749{
 750	u32 eax;
 751	int err;
 752
 753	if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
 754		return err;
 755	*val = eax;
 756	return APM_SUCCESS;
 757}
 758
 759/**
 760 *	apm_get_event	-	get an APM event from the BIOS
 761 *	@event: pointer to the event
 762 *	@info: point to the event information
 763 *
 764 *	The APM BIOS provides a polled information for event
 765 *	reporting. The BIOS expects to be polled at least every second
 766 *	when events are pending. When a message is found the caller should
 767 *	poll until no more messages are present.  However, this causes
 768 *	problems on some laptops where a suspend event notification is
 769 *	not cleared until it is acknowledged.
 770 *
 771 *	Additional information is returned in the info pointer, providing
 772 *	that APM 1.2 is in use. If no messges are pending the value 0x80
 773 *	is returned (No power management events pending).
 774 */
 775static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
 776{
 777	struct apm_bios_call call;
 778
 779	call.func = APM_FUNC_GET_EVENT;
 780	call.ebx = call.ecx = 0;
 781
 782	if (apm_bios_call(&call))
 783		return call.err;
 784
 785	*event = call.ebx;
 786	if (apm_info.connection_version < 0x0102)
 787		*info = ~0; /* indicate info not valid */
 788	else
 789		*info = call.ecx;
 790	return APM_SUCCESS;
 791}
 792
 793/**
 794 *	set_power_state	-	set the power management state
 795 *	@what: which items to transition
 796 *	@state: state to transition to
 797 *
 798 *	Request an APM change of state for one or more system devices. The
 799 *	processor state must be transitioned last of all. what holds the
 800 *	class of device in the upper byte and the device number (0xFF for
 801 *	all) for the object to be transitioned.
 802 *
 803 *	The state holds the state to transition to, which may in fact
 804 *	be an acceptance of a BIOS requested state change.
 805 */
 806
 807static int set_power_state(u_short what, u_short state)
 808{
 809	u32 eax;
 810	int err;
 811
 812	if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
 813		return err;
 814	return APM_SUCCESS;
 815}
 816
 817/**
 818 *	set_system_power_state - set system wide power state
 819 *	@state: which state to enter
 820 *
 821 *	Transition the entire system into a new APM power state.
 822 */
 823
 824static int set_system_power_state(u_short state)
 825{
 826	return set_power_state(APM_DEVICE_ALL, state);
 827}
 828
 829/**
 830 *	apm_do_idle	-	perform power saving
 831 *
 832 *	This function notifies the BIOS that the processor is (in the view
 833 *	of the OS) idle. It returns -1 in the event that the BIOS refuses
 834 *	to handle the idle request. On a success the function returns 1
 835 *	if the BIOS did clock slowing or 0 otherwise.
 836 */
 837
 838static int apm_do_idle(void)
 839{
 840	u32 eax;
 841	u8 ret = 0;
 842	int idled = 0;
 843	int err = 0;
 844
 845	if (!need_resched()) {
 846		idled = 1;
 847		ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
 848	}
 849
 850	if (!idled)
 851		return 0;
 852
 853	if (ret) {
 854		static unsigned long t;
 855
 856		/* This always fails on some SMP boards running UP kernels.
 857		 * Only report the failure the first 5 times.
 858		 */
 859		if (++t < 5) {
 860			printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
 861			t = jiffies;
 862		}
 863		return -1;
 864	}
 865	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
 866	return clock_slowed;
 867}
 868
 869/**
 870 *	apm_do_busy	-	inform the BIOS the CPU is busy
 871 *
 872 *	Request that the BIOS brings the CPU back to full performance.
 873 */
 874
 875static void apm_do_busy(void)
 876{
 877	u32 dummy;
 878	int err;
 879
 880	if (clock_slowed || ALWAYS_CALL_BUSY) {
 881		(void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
 882		clock_slowed = 0;
 883	}
 884}
 885
 886/*
 887 * If no process has really been interested in
 888 * the CPU for some time, we want to call BIOS
 889 * power management - we probably want
 890 * to conserve power.
 891 */
 892#define IDLE_CALC_LIMIT	(HZ * 100)
 893#define IDLE_LEAKY_MAX	16
 894
 895/**
 896 * apm_cpu_idle		-	cpu idling for APM capable Linux
 897 *
 898 * This is the idling function the kernel executes when APM is available. It
 899 * tries to do BIOS powermanagement based on the average system idle time.
 900 * Furthermore it calls the system default idle routine.
 901 */
 902
 903static int apm_cpu_idle(struct cpuidle_device *dev,
 904	struct cpuidle_driver *drv, int index)
 905{
 906	static int use_apm_idle; /* = 0 */
 907	static unsigned int last_jiffies; /* = 0 */
 908	static unsigned int last_stime; /* = 0 */
 909	cputime_t stime, utime;
 910
 911	int apm_idle_done = 0;
 912	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
 913	unsigned int bucket;
 914
 915recalc:
 916	task_cputime(current, &utime, &stime);
 917	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
 918		use_apm_idle = 0;
 919	} else if (jiffies_since_last_check > idle_period) {
 920		unsigned int idle_percentage;
 921
 922		idle_percentage = cputime_to_jiffies(stime - last_stime);
 923		idle_percentage *= 100;
 924		idle_percentage /= jiffies_since_last_check;
 925		use_apm_idle = (idle_percentage > idle_threshold);
 926		if (apm_info.forbid_idle)
 927			use_apm_idle = 0;
 928	}
 929
 930	last_jiffies = jiffies;
 931	last_stime = stime;
 932
 933	bucket = IDLE_LEAKY_MAX;
 934
 935	while (!need_resched()) {
 936		if (use_apm_idle) {
 937			unsigned int t;
 938
 939			t = jiffies;
 940			switch (apm_do_idle()) {
 941			case 0:
 942				apm_idle_done = 1;
 943				if (t != jiffies) {
 944					if (bucket) {
 945						bucket = IDLE_LEAKY_MAX;
 946						continue;
 947					}
 948				} else if (bucket) {
 949					bucket--;
 950					continue;
 951				}
 952				break;
 953			case 1:
 954				apm_idle_done = 1;
 955				break;
 956			default: /* BIOS refused */
 957				break;
 958			}
 959		}
 960		default_idle();
 961		local_irq_disable();
 962		jiffies_since_last_check = jiffies - last_jiffies;
 963		if (jiffies_since_last_check > idle_period)
 964			goto recalc;
 965	}
 966
 967	if (apm_idle_done)
 968		apm_do_busy();
 969
 970	return index;
 971}
 972
 973/**
 974 *	apm_power_off	-	ask the BIOS to power off
 975 *
 976 *	Handle the power off sequence. This is the one piece of code we
 977 *	will execute even on SMP machines. In order to deal with BIOS
 978 *	bugs we support real mode APM BIOS power off calls. We also make
 979 *	the SMP call on CPU0 as some systems will only honour this call
 980 *	on their first cpu.
 981 */
 982
 983static void apm_power_off(void)
 984{
 985	/* Some bioses don't like being called from CPU != 0 */
 986	if (apm_info.realmode_power_off) {
 987		set_cpus_allowed_ptr(current, cpumask_of(0));
 988		machine_real_restart(MRR_APM);
 989	} else {
 990		(void)set_system_power_state(APM_STATE_OFF);
 991	}
 992}
 993
 994#ifdef CONFIG_APM_DO_ENABLE
 995
 996/**
 997 *	apm_enable_power_management - enable BIOS APM power management
 998 *	@enable: enable yes/no
 999 *
1000 *	Enable or disable the APM BIOS power services.
1001 */
1002
1003static int apm_enable_power_management(int enable)
1004{
1005	u32 eax;
1006	int err;
1007
1008	if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1009		return APM_NOT_ENGAGED;
1010	if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1011				 enable, &eax, &err))
1012		return err;
1013	if (enable)
1014		apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1015	else
1016		apm_info.bios.flags |= APM_BIOS_DISABLED;
1017	return APM_SUCCESS;
1018}
1019#endif
1020
1021/**
1022 *	apm_get_power_status	-	get current power state
1023 *	@status: returned status
1024 *	@bat: battery info
1025 *	@life: estimated life
1026 *
1027 *	Obtain the current power status from the APM BIOS. We return a
1028 *	status which gives the rough battery status, and current power
1029 *	source. The bat value returned give an estimate as a percentage
1030 *	of life and a status value for the battery. The estimated life
1031 *	if reported is a lifetime in secodnds/minutes at current powwer
1032 *	consumption.
1033 */
1034
1035static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1036{
1037	struct apm_bios_call call;
1038
1039	call.func = APM_FUNC_GET_STATUS;
1040	call.ebx = APM_DEVICE_ALL;
1041	call.ecx = 0;
1042
1043	if (apm_info.get_power_status_broken)
1044		return APM_32_UNSUPPORTED;
1045	if (apm_bios_call(&call)) {
1046		if (!call.err)
1047			return APM_NO_ERROR;
1048		return call.err;
1049	}
1050	*status = call.ebx;
1051	*bat = call.ecx;
1052	if (apm_info.get_power_status_swabinminutes) {
1053		*life = swab16((u16)call.edx);
1054		*life |= 0x8000;
1055	} else
1056		*life = call.edx;
1057	return APM_SUCCESS;
1058}
1059
1060#if 0
1061static int apm_get_battery_status(u_short which, u_short *status,
1062				  u_short *bat, u_short *life, u_short *nbat)
1063{
1064	u32 eax;
1065	u32 ebx;
1066	u32 ecx;
1067	u32 edx;
1068	u32 esi;
1069
1070	if (apm_info.connection_version < 0x0102) {
1071		/* pretend we only have one battery. */
1072		if (which != 1)
1073			return APM_BAD_DEVICE;
1074		*nbat = 1;
1075		return apm_get_power_status(status, bat, life);
1076	}
1077
1078	if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1079			  &ebx, &ecx, &edx, &esi))
1080		return (eax >> 8) & 0xff;
1081	*status = ebx;
1082	*bat = ecx;
1083	*life = edx;
1084	*nbat = esi;
1085	return APM_SUCCESS;
1086}
1087#endif
1088
1089/**
1090 *	apm_engage_power_management	-	enable PM on a device
1091 *	@device: identity of device
1092 *	@enable: on/off
1093 *
1094 *	Activate or deactivate power management on either a specific device
1095 *	or the entire system (%APM_DEVICE_ALL).
1096 */
1097
1098static int apm_engage_power_management(u_short device, int enable)
1099{
1100	u32 eax;
1101	int err;
1102
1103	if ((enable == 0) && (device == APM_DEVICE_ALL)
1104	    && (apm_info.bios.flags & APM_BIOS_DISABLED))
1105		return APM_DISABLED;
1106	if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1107				 &eax, &err))
1108		return err;
1109	if (device == APM_DEVICE_ALL) {
1110		if (enable)
1111			apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1112		else
1113			apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1114	}
1115	return APM_SUCCESS;
1116}
1117
1118#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1119
1120/**
1121 *	apm_console_blank	-	blank the display
1122 *	@blank: on/off
1123 *
1124 *	Attempt to blank the console, firstly by blanking just video device
1125 *	zero, and if that fails (some BIOSes don't support it) then it blanks
1126 *	all video devices. Typically the BIOS will do laptop backlight and
1127 *	monitor powerdown for us.
1128 */
1129
1130static int apm_console_blank(int blank)
1131{
1132	int error = APM_NOT_ENGAGED; /* silence gcc */
1133	int i;
1134	u_short state;
1135	static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1136
1137	state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1138
1139	for (i = 0; i < ARRAY_SIZE(dev); i++) {
1140		error = set_power_state(dev[i], state);
1141
1142		if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1143			return 1;
1144
1145		if (error == APM_NOT_ENGAGED)
1146			break;
1147	}
1148
1149	if (error == APM_NOT_ENGAGED) {
1150		static int tried;
1151		int eng_error;
1152		if (tried++ == 0) {
1153			eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1154			if (eng_error) {
1155				apm_error("set display", error);
1156				apm_error("engage interface", eng_error);
1157				return 0;
1158			} else
1159				return apm_console_blank(blank);
1160		}
1161	}
1162	apm_error("set display", error);
1163	return 0;
1164}
1165#endif
1166
1167static int queue_empty(struct apm_user *as)
1168{
1169	return as->event_head == as->event_tail;
1170}
1171
1172static apm_event_t get_queued_event(struct apm_user *as)
1173{
1174	if (++as->event_tail >= APM_MAX_EVENTS)
1175		as->event_tail = 0;
1176	return as->events[as->event_tail];
1177}
1178
1179static void queue_event(apm_event_t event, struct apm_user *sender)
1180{
1181	struct apm_user *as;
1182
1183	spin_lock(&user_list_lock);
1184	if (user_list == NULL)
1185		goto out;
1186	for (as = user_list; as != NULL; as = as->next) {
1187		if ((as == sender) || (!as->reader))
1188			continue;
1189		if (++as->event_head >= APM_MAX_EVENTS)
1190			as->event_head = 0;
1191
1192		if (as->event_head == as->event_tail) {
1193			static int notified;
1194
1195			if (notified++ == 0)
1196				pr_err("an event queue overflowed\n");
1197			if (++as->event_tail >= APM_MAX_EVENTS)
1198				as->event_tail = 0;
1199		}
1200		as->events[as->event_head] = event;
1201		if (!as->suser || !as->writer)
1202			continue;
1203		switch (event) {
1204		case APM_SYS_SUSPEND:
1205		case APM_USER_SUSPEND:
1206			as->suspends_pending++;
1207			suspends_pending++;
1208			break;
1209
1210		case APM_SYS_STANDBY:
1211		case APM_USER_STANDBY:
1212			as->standbys_pending++;
1213			standbys_pending++;
1214			break;
1215		}
1216	}
1217	wake_up_interruptible(&apm_waitqueue);
1218out:
1219	spin_unlock(&user_list_lock);
1220}
1221
1222static void reinit_timer(void)
1223{
1224#ifdef INIT_TIMER_AFTER_SUSPEND
1225	unsigned long flags;
1226
1227	raw_spin_lock_irqsave(&i8253_lock, flags);
1228	/* set the clock to HZ */
1229	outb_p(0x34, PIT_MODE);		/* binary, mode 2, LSB/MSB, ch 0 */
1230	udelay(10);
1231	outb_p(LATCH & 0xff, PIT_CH0);	/* LSB */
1232	udelay(10);
1233	outb_p(LATCH >> 8, PIT_CH0);	/* MSB */
1234	udelay(10);
1235	raw_spin_unlock_irqrestore(&i8253_lock, flags);
1236#endif
1237}
1238
1239static int suspend(int vetoable)
1240{
1241	int err;
1242	struct apm_user	*as;
1243
1244	dpm_suspend_start(PMSG_SUSPEND);
1245	dpm_suspend_end(PMSG_SUSPEND);
1246
1247	local_irq_disable();
1248	syscore_suspend();
1249
1250	local_irq_enable();
1251
1252	save_processor_state();
1253	err = set_system_power_state(APM_STATE_SUSPEND);
1254	ignore_normal_resume = 1;
1255	restore_processor_state();
1256
1257	local_irq_disable();
1258	reinit_timer();
1259
1260	if (err == APM_NO_ERROR)
1261		err = APM_SUCCESS;
1262	if (err != APM_SUCCESS)
1263		apm_error("suspend", err);
1264	err = (err == APM_SUCCESS) ? 0 : -EIO;
1265
1266	syscore_resume();
1267	local_irq_enable();
1268
1269	dpm_resume_start(PMSG_RESUME);
1270	dpm_resume_end(PMSG_RESUME);
1271
1272	queue_event(APM_NORMAL_RESUME, NULL);
1273	spin_lock(&user_list_lock);
1274	for (as = user_list; as != NULL; as = as->next) {
1275		as->suspend_wait = 0;
1276		as->suspend_result = err;
1277	}
1278	spin_unlock(&user_list_lock);
1279	wake_up_interruptible(&apm_suspend_waitqueue);
1280	return err;
1281}
1282
1283static void standby(void)
1284{
1285	int err;
1286
1287	dpm_suspend_end(PMSG_SUSPEND);
1288
1289	local_irq_disable();
1290	syscore_suspend();
1291	local_irq_enable();
1292
1293	err = set_system_power_state(APM_STATE_STANDBY);
1294	if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1295		apm_error("standby", err);
1296
1297	local_irq_disable();
1298	syscore_resume();
1299	local_irq_enable();
1300
1301	dpm_resume_start(PMSG_RESUME);
1302}
1303
1304static apm_event_t get_event(void)
1305{
1306	int error;
1307	apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1308	apm_eventinfo_t	info;
1309
1310	static int notified;
1311
1312	/* we don't use the eventinfo */
1313	error = apm_get_event(&event, &info);
1314	if (error == APM_SUCCESS)
1315		return event;
1316
1317	if ((error != APM_NO_EVENTS) && (notified++ == 0))
1318		apm_error("get_event", error);
1319
1320	return 0;
1321}
1322
1323static void check_events(void)
1324{
1325	apm_event_t event;
1326	static unsigned long last_resume;
1327	static int ignore_bounce;
1328
1329	while ((event = get_event()) != 0) {
1330		if (debug) {
1331			if (event <= NR_APM_EVENT_NAME)
1332				printk(KERN_DEBUG "apm: received %s notify\n",
1333				       apm_event_name[event - 1]);
1334			else
1335				printk(KERN_DEBUG "apm: received unknown "
1336				       "event 0x%02x\n", event);
1337		}
1338		if (ignore_bounce
1339		    && (time_after(jiffies, last_resume + bounce_interval)))
1340			ignore_bounce = 0;
1341
1342		switch (event) {
1343		case APM_SYS_STANDBY:
1344		case APM_USER_STANDBY:
1345			queue_event(event, NULL);
1346			if (standbys_pending <= 0)
1347				standby();
1348			break;
1349
1350		case APM_USER_SUSPEND:
1351#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1352			if (apm_info.connection_version > 0x100)
1353				set_system_power_state(APM_STATE_REJECT);
1354			break;
1355#endif
1356		case APM_SYS_SUSPEND:
1357			if (ignore_bounce) {
1358				if (apm_info.connection_version > 0x100)
1359					set_system_power_state(APM_STATE_REJECT);
1360				break;
1361			}
1362			/*
1363			 * If we are already processing a SUSPEND,
1364			 * then further SUSPEND events from the BIOS
1365			 * will be ignored.  We also return here to
1366			 * cope with the fact that the Thinkpads keep
1367			 * sending a SUSPEND event until something else
1368			 * happens!
1369			 */
1370			if (ignore_sys_suspend)
1371				return;
1372			ignore_sys_suspend = 1;
1373			queue_event(event, NULL);
1374			if (suspends_pending <= 0)
1375				(void) suspend(1);
1376			break;
1377
1378		case APM_NORMAL_RESUME:
1379		case APM_CRITICAL_RESUME:
1380		case APM_STANDBY_RESUME:
1381			ignore_sys_suspend = 0;
1382			last_resume = jiffies;
1383			ignore_bounce = 1;
1384			if ((event != APM_NORMAL_RESUME)
1385			    || (ignore_normal_resume == 0)) {
1386				dpm_resume_end(PMSG_RESUME);
1387				queue_event(event, NULL);
1388			}
1389			ignore_normal_resume = 0;
1390			break;
1391
1392		case APM_CAPABILITY_CHANGE:
1393		case APM_LOW_BATTERY:
1394		case APM_POWER_STATUS_CHANGE:
1395			queue_event(event, NULL);
1396			/* If needed, notify drivers here */
1397			break;
1398
1399		case APM_UPDATE_TIME:
1400			break;
1401
1402		case APM_CRITICAL_SUSPEND:
1403			/*
1404			 * We are not allowed to reject a critical suspend.
1405			 */
1406			(void)suspend(0);
1407			break;
1408		}
1409	}
1410}
1411
1412static void apm_event_handler(void)
1413{
1414	static int pending_count = 4;
1415	int err;
1416
1417	if ((standbys_pending > 0) || (suspends_pending > 0)) {
1418		if ((apm_info.connection_version > 0x100) &&
1419		    (pending_count-- <= 0)) {
1420			pending_count = 4;
1421			if (debug)
1422				printk(KERN_DEBUG "apm: setting state busy\n");
1423			err = set_system_power_state(APM_STATE_BUSY);
1424			if (err)
1425				apm_error("busy", err);
1426		}
1427	} else
1428		pending_count = 4;
1429	check_events();
1430}
1431
1432/*
1433 * This is the APM thread main loop.
1434 */
1435
1436static void apm_mainloop(void)
1437{
1438	DECLARE_WAITQUEUE(wait, current);
1439
1440	add_wait_queue(&apm_waitqueue, &wait);
1441	set_current_state(TASK_INTERRUPTIBLE);
1442	for (;;) {
1443		schedule_timeout(APM_CHECK_TIMEOUT);
1444		if (kthread_should_stop())
1445			break;
1446		/*
1447		 * Ok, check all events, check for idle (and mark us sleeping
1448		 * so as not to count towards the load average)..
1449		 */
1450		set_current_state(TASK_INTERRUPTIBLE);
1451		apm_event_handler();
1452	}
1453	remove_wait_queue(&apm_waitqueue, &wait);
1454}
1455
1456static int check_apm_user(struct apm_user *as, const char *func)
1457{
1458	if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1459		pr_err("%s passed bad filp\n", func);
1460		return 1;
1461	}
1462	return 0;
1463}
1464
1465static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1466{
1467	struct apm_user *as;
1468	int i;
1469	apm_event_t event;
1470
1471	as = fp->private_data;
1472	if (check_apm_user(as, "read"))
1473		return -EIO;
1474	if ((int)count < sizeof(apm_event_t))
1475		return -EINVAL;
1476	if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1477		return -EAGAIN;
1478	wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1479	i = count;
1480	while ((i >= sizeof(event)) && !queue_empty(as)) {
1481		event = get_queued_event(as);
1482		if (copy_to_user(buf, &event, sizeof(event))) {
1483			if (i < count)
1484				break;
1485			return -EFAULT;
1486		}
1487		switch (event) {
1488		case APM_SYS_SUSPEND:
1489		case APM_USER_SUSPEND:
1490			as->suspends_read++;
1491			break;
1492
1493		case APM_SYS_STANDBY:
1494		case APM_USER_STANDBY:
1495			as->standbys_read++;
1496			break;
1497		}
1498		buf += sizeof(event);
1499		i -= sizeof(event);
1500	}
1501	if (i < count)
1502		return count - i;
1503	if (signal_pending(current))
1504		return -ERESTARTSYS;
1505	return 0;
1506}
1507
1508static unsigned int do_poll(struct file *fp, poll_table *wait)
1509{
1510	struct apm_user *as;
1511
1512	as = fp->private_data;
1513	if (check_apm_user(as, "poll"))
1514		return 0;
1515	poll_wait(fp, &apm_waitqueue, wait);
1516	if (!queue_empty(as))
1517		return POLLIN | POLLRDNORM;
1518	return 0;
1519}
1520
1521static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1522{
1523	struct apm_user *as;
1524	int ret;
1525
1526	as = filp->private_data;
1527	if (check_apm_user(as, "ioctl"))
1528		return -EIO;
1529	if (!as->suser || !as->writer)
1530		return -EPERM;
1531	switch (cmd) {
1532	case APM_IOC_STANDBY:
1533		mutex_lock(&apm_mutex);
1534		if (as->standbys_read > 0) {
1535			as->standbys_read--;
1536			as->standbys_pending--;
1537			standbys_pending--;
1538		} else
1539			queue_event(APM_USER_STANDBY, as);
1540		if (standbys_pending <= 0)
1541			standby();
1542		mutex_unlock(&apm_mutex);
1543		break;
1544	case APM_IOC_SUSPEND:
1545		mutex_lock(&apm_mutex);
1546		if (as->suspends_read > 0) {
1547			as->suspends_read--;
1548			as->suspends_pending--;
1549			suspends_pending--;
1550		} else
1551			queue_event(APM_USER_SUSPEND, as);
1552		if (suspends_pending <= 0) {
1553			ret = suspend(1);
1554			mutex_unlock(&apm_mutex);
1555		} else {
1556			as->suspend_wait = 1;
1557			mutex_unlock(&apm_mutex);
1558			wait_event_interruptible(apm_suspend_waitqueue,
1559					as->suspend_wait == 0);
1560			ret = as->suspend_result;
1561		}
1562		return ret;
1563	default:
1564		return -ENOTTY;
1565	}
1566	return 0;
1567}
1568
1569static int do_release(struct inode *inode, struct file *filp)
1570{
1571	struct apm_user *as;
1572
1573	as = filp->private_data;
1574	if (check_apm_user(as, "release"))
1575		return 0;
1576	filp->private_data = NULL;
1577	if (as->standbys_pending > 0) {
1578		standbys_pending -= as->standbys_pending;
1579		if (standbys_pending <= 0)
1580			standby();
1581	}
1582	if (as->suspends_pending > 0) {
1583		suspends_pending -= as->suspends_pending;
1584		if (suspends_pending <= 0)
1585			(void) suspend(1);
1586	}
1587	spin_lock(&user_list_lock);
1588	if (user_list == as)
1589		user_list = as->next;
1590	else {
1591		struct apm_user *as1;
1592
1593		for (as1 = user_list;
1594		     (as1 != NULL) && (as1->next != as);
1595		     as1 = as1->next)
1596			;
1597		if (as1 == NULL)
1598			pr_err("filp not in user list\n");
1599		else
1600			as1->next = as->next;
1601	}
1602	spin_unlock(&user_list_lock);
1603	kfree(as);
1604	return 0;
1605}
1606
1607static int do_open(struct inode *inode, struct file *filp)
1608{
1609	struct apm_user *as;
1610
1611	as = kmalloc(sizeof(*as), GFP_KERNEL);
1612	if (as == NULL)
1613		return -ENOMEM;
1614
1615	as->magic = APM_BIOS_MAGIC;
1616	as->event_tail = as->event_head = 0;
1617	as->suspends_pending = as->standbys_pending = 0;
1618	as->suspends_read = as->standbys_read = 0;
1619	/*
1620	 * XXX - this is a tiny bit broken, when we consider BSD
1621	 * process accounting. If the device is opened by root, we
1622	 * instantly flag that we used superuser privs. Who knows,
1623	 * we might close the device immediately without doing a
1624	 * privileged operation -- cevans
1625	 */
1626	as->suser = capable(CAP_SYS_ADMIN);
1627	as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1628	as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1629	spin_lock(&user_list_lock);
1630	as->next = user_list;
1631	user_list = as;
1632	spin_unlock(&user_list_lock);
1633	filp->private_data = as;
1634	return 0;
1635}
1636
 
1637static int proc_apm_show(struct seq_file *m, void *v)
1638{
1639	unsigned short	bx;
1640	unsigned short	cx;
1641	unsigned short	dx;
1642	int		error;
1643	unsigned short  ac_line_status = 0xff;
1644	unsigned short  battery_status = 0xff;
1645	unsigned short  battery_flag   = 0xff;
1646	int		percentage     = -1;
1647	int             time_units     = -1;
1648	char            *units         = "?";
1649
1650	if ((num_online_cpus() == 1) &&
1651	    !(error = apm_get_power_status(&bx, &cx, &dx))) {
1652		ac_line_status = (bx >> 8) & 0xff;
1653		battery_status = bx & 0xff;
1654		if ((cx & 0xff) != 0xff)
1655			percentage = cx & 0xff;
1656
1657		if (apm_info.connection_version > 0x100) {
1658			battery_flag = (cx >> 8) & 0xff;
1659			if (dx != 0xffff) {
1660				units = (dx & 0x8000) ? "min" : "sec";
1661				time_units = dx & 0x7fff;
1662			}
1663		}
1664	}
1665	/* Arguments, with symbols from linux/apm_bios.h.  Information is
1666	   from the Get Power Status (0x0a) call unless otherwise noted.
1667
1668	   0) Linux driver version (this will change if format changes)
1669	   1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
1670	   2) APM flags from APM Installation Check (0x00):
1671	      bit 0: APM_16_BIT_SUPPORT
1672	      bit 1: APM_32_BIT_SUPPORT
1673	      bit 2: APM_IDLE_SLOWS_CLOCK
1674	      bit 3: APM_BIOS_DISABLED
1675	      bit 4: APM_BIOS_DISENGAGED
1676	   3) AC line status
1677	      0x00: Off-line
1678	      0x01: On-line
1679	      0x02: On backup power (BIOS >= 1.1 only)
1680	      0xff: Unknown
1681	   4) Battery status
1682	      0x00: High
1683	      0x01: Low
1684	      0x02: Critical
1685	      0x03: Charging
1686	      0x04: Selected battery not present (BIOS >= 1.2 only)
1687	      0xff: Unknown
1688	   5) Battery flag
1689	      bit 0: High
1690	      bit 1: Low
1691	      bit 2: Critical
1692	      bit 3: Charging
1693	      bit 7: No system battery
1694	      0xff: Unknown
1695	   6) Remaining battery life (percentage of charge):
1696	      0-100: valid
1697	      -1: Unknown
1698	   7) Remaining battery life (time units):
1699	      Number of remaining minutes or seconds
1700	      -1: Unknown
1701	   8) min = minutes; sec = seconds */
1702
1703	seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1704		   driver_version,
1705		   (apm_info.bios.version >> 8) & 0xff,
1706		   apm_info.bios.version & 0xff,
1707		   apm_info.bios.flags,
1708		   ac_line_status,
1709		   battery_status,
1710		   battery_flag,
1711		   percentage,
1712		   time_units,
1713		   units);
1714	return 0;
1715}
1716
1717static int proc_apm_open(struct inode *inode, struct file *file)
1718{
1719	return single_open(file, proc_apm_show, NULL);
1720}
1721
1722static const struct file_operations apm_file_ops = {
1723	.owner		= THIS_MODULE,
1724	.open		= proc_apm_open,
1725	.read		= seq_read,
1726	.llseek		= seq_lseek,
1727	.release	= single_release,
1728};
1729
1730static int apm(void *unused)
1731{
1732	unsigned short	bx;
1733	unsigned short	cx;
1734	unsigned short	dx;
1735	int		error;
1736	char 		*power_stat;
1737	char 		*bat_stat;
1738
1739	/* 2002/08/01 - WT
1740	 * This is to avoid random crashes at boot time during initialization
1741	 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1742	 * Some bioses don't like being called from CPU != 0.
1743	 * Method suggested by Ingo Molnar.
1744	 */
1745	set_cpus_allowed_ptr(current, cpumask_of(0));
1746	BUG_ON(smp_processor_id() != 0);
1747
1748	if (apm_info.connection_version == 0) {
1749		apm_info.connection_version = apm_info.bios.version;
1750		if (apm_info.connection_version > 0x100) {
1751			/*
1752			 * We only support BIOSs up to version 1.2
1753			 */
1754			if (apm_info.connection_version > 0x0102)
1755				apm_info.connection_version = 0x0102;
1756			error = apm_driver_version(&apm_info.connection_version);
1757			if (error != APM_SUCCESS) {
1758				apm_error("driver version", error);
1759				/* Fall back to an APM 1.0 connection. */
1760				apm_info.connection_version = 0x100;
1761			}
1762		}
1763	}
1764
1765	if (debug)
1766		printk(KERN_INFO "apm: Connection version %d.%d\n",
1767			(apm_info.connection_version >> 8) & 0xff,
1768			apm_info.connection_version & 0xff);
1769
1770#ifdef CONFIG_APM_DO_ENABLE
1771	if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1772		/*
1773		 * This call causes my NEC UltraLite Versa 33/C to hang if it
1774		 * is booted with PM disabled but not in the docking station.
1775		 * Unfortunate ...
1776		 */
1777		error = apm_enable_power_management(1);
1778		if (error) {
1779			apm_error("enable power management", error);
1780			return -1;
1781		}
1782	}
1783#endif
1784
1785	if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1786	    && (apm_info.connection_version > 0x0100)) {
1787		error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1788		if (error) {
1789			apm_error("engage power management", error);
1790			return -1;
1791		}
1792	}
1793
1794	if (debug && (num_online_cpus() == 1 || smp)) {
1795		error = apm_get_power_status(&bx, &cx, &dx);
1796		if (error)
1797			printk(KERN_INFO "apm: power status not available\n");
1798		else {
1799			switch ((bx >> 8) & 0xff) {
1800			case 0:
1801				power_stat = "off line";
1802				break;
1803			case 1:
1804				power_stat = "on line";
1805				break;
1806			case 2:
1807				power_stat = "on backup power";
1808				break;
1809			default:
1810				power_stat = "unknown";
1811				break;
1812			}
1813			switch (bx & 0xff) {
1814			case 0:
1815				bat_stat = "high";
1816				break;
1817			case 1:
1818				bat_stat = "low";
1819				break;
1820			case 2:
1821				bat_stat = "critical";
1822				break;
1823			case 3:
1824				bat_stat = "charging";
1825				break;
1826			default:
1827				bat_stat = "unknown";
1828				break;
1829			}
1830			printk(KERN_INFO
1831			       "apm: AC %s, battery status %s, battery life ",
1832			       power_stat, bat_stat);
1833			if ((cx & 0xff) == 0xff)
1834				printk("unknown\n");
1835			else
1836				printk("%d%%\n", cx & 0xff);
1837			if (apm_info.connection_version > 0x100) {
1838				printk(KERN_INFO
1839				       "apm: battery flag 0x%02x, battery life ",
1840				       (cx >> 8) & 0xff);
1841				if (dx == 0xffff)
1842					printk("unknown\n");
1843				else
1844					printk("%d %s\n", dx & 0x7fff,
1845					       (dx & 0x8000) ?
1846					       "minutes" : "seconds");
1847			}
1848		}
1849	}
1850
1851	/* Install our power off handler.. */
1852	if (power_off)
1853		pm_power_off = apm_power_off;
1854
1855	if (num_online_cpus() == 1 || smp) {
1856#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1857		console_blank_hook = apm_console_blank;
1858#endif
1859		apm_mainloop();
1860#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1861		console_blank_hook = NULL;
1862#endif
1863	}
1864
1865	return 0;
1866}
1867
1868#ifndef MODULE
1869static int __init apm_setup(char *str)
1870{
1871	int invert;
1872
1873	while ((str != NULL) && (*str != '\0')) {
1874		if (strncmp(str, "off", 3) == 0)
1875			apm_disabled = 1;
1876		if (strncmp(str, "on", 2) == 0)
1877			apm_disabled = 0;
1878		if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1879		    (strncmp(str, "bounce_interval=", 16) == 0))
1880			bounce_interval = simple_strtol(str + 16, NULL, 0);
1881		if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1882		    (strncmp(str, "idle_threshold=", 15) == 0))
1883			idle_threshold = simple_strtol(str + 15, NULL, 0);
1884		if ((strncmp(str, "idle-period=", 12) == 0) ||
1885		    (strncmp(str, "idle_period=", 12) == 0))
1886			idle_period = simple_strtol(str + 12, NULL, 0);
1887		invert = (strncmp(str, "no-", 3) == 0) ||
1888			(strncmp(str, "no_", 3) == 0);
1889		if (invert)
1890			str += 3;
1891		if (strncmp(str, "debug", 5) == 0)
1892			debug = !invert;
1893		if ((strncmp(str, "power-off", 9) == 0) ||
1894		    (strncmp(str, "power_off", 9) == 0))
1895			power_off = !invert;
1896		if (strncmp(str, "smp", 3) == 0) {
1897			smp = !invert;
1898			idle_threshold = 100;
1899		}
1900		if ((strncmp(str, "allow-ints", 10) == 0) ||
1901		    (strncmp(str, "allow_ints", 10) == 0))
1902			apm_info.allow_ints = !invert;
1903		if ((strncmp(str, "broken-psr", 10) == 0) ||
1904		    (strncmp(str, "broken_psr", 10) == 0))
1905			apm_info.get_power_status_broken = !invert;
1906		if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1907		    (strncmp(str, "realmode_power_off", 18) == 0))
1908			apm_info.realmode_power_off = !invert;
1909		str = strchr(str, ',');
1910		if (str != NULL)
1911			str += strspn(str, ", \t");
1912	}
1913	return 1;
1914}
1915
1916__setup("apm=", apm_setup);
1917#endif
1918
1919static const struct file_operations apm_bios_fops = {
1920	.owner		= THIS_MODULE,
1921	.read		= do_read,
1922	.poll		= do_poll,
1923	.unlocked_ioctl	= do_ioctl,
1924	.open		= do_open,
1925	.release	= do_release,
1926	.llseek		= noop_llseek,
1927};
1928
1929static struct miscdevice apm_device = {
1930	APM_MINOR_DEV,
1931	"apm_bios",
1932	&apm_bios_fops
1933};
1934
1935
1936/* Simple "print if true" callback */
1937static int __init print_if_true(const struct dmi_system_id *d)
1938{
1939	printk("%s\n", d->ident);
1940	return 0;
1941}
1942
1943/*
1944 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1945 * disabled before the suspend. Linux used to get terribly confused by that.
1946 */
1947static int __init broken_ps2_resume(const struct dmi_system_id *d)
1948{
1949	printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1950	       "workaround hopefully not needed.\n", d->ident);
1951	return 0;
1952}
1953
1954/* Some bioses have a broken protected mode poweroff and need to use realmode */
1955static int __init set_realmode_power_off(const struct dmi_system_id *d)
1956{
1957	if (apm_info.realmode_power_off == 0) {
1958		apm_info.realmode_power_off = 1;
1959		printk(KERN_INFO "%s bios detected. "
1960		       "Using realmode poweroff only.\n", d->ident);
1961	}
1962	return 0;
1963}
1964
1965/* Some laptops require interrupts to be enabled during APM calls */
1966static int __init set_apm_ints(const struct dmi_system_id *d)
1967{
1968	if (apm_info.allow_ints == 0) {
1969		apm_info.allow_ints = 1;
1970		printk(KERN_INFO "%s machine detected. "
1971		       "Enabling interrupts during APM calls.\n", d->ident);
1972	}
1973	return 0;
1974}
1975
1976/* Some APM bioses corrupt memory or just plain do not work */
1977static int __init apm_is_horked(const struct dmi_system_id *d)
1978{
1979	if (apm_info.disabled == 0) {
1980		apm_info.disabled = 1;
1981		printk(KERN_INFO "%s machine detected. "
1982		       "Disabling APM.\n", d->ident);
1983	}
1984	return 0;
1985}
1986
1987static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1988{
1989	if (apm_info.disabled == 0) {
1990		apm_info.disabled = 1;
1991		printk(KERN_INFO "%s machine detected. "
1992		       "Disabling APM.\n", d->ident);
1993		printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1994		printk(KERN_INFO "download from support.intel.com\n");
1995	}
1996	return 0;
1997}
1998
1999/* Some APM bioses hang on APM idle calls */
2000static int __init apm_likes_to_melt(const struct dmi_system_id *d)
2001{
2002	if (apm_info.forbid_idle == 0) {
2003		apm_info.forbid_idle = 1;
2004		printk(KERN_INFO "%s machine detected. "
2005		       "Disabling APM idle calls.\n", d->ident);
2006	}
2007	return 0;
2008}
2009
2010/*
2011 *  Check for clue free BIOS implementations who use
2012 *  the following QA technique
2013 *
2014 *      [ Write BIOS Code ]<------
2015 *               |                ^
2016 *      < Does it Compile >----N--
2017 *               |Y               ^
2018 *	< Does it Boot Win98 >-N--
2019 *               |Y
2020 *           [Ship It]
2021 *
2022 *	Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
2023 *	Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
2024 */
2025static int __init broken_apm_power(const struct dmi_system_id *d)
2026{
2027	apm_info.get_power_status_broken = 1;
2028	printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2029	       "disabling power status reporting.\n");
2030	return 0;
2031}
2032
2033/*
2034 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2035 * have this problem).
2036 */
2037static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2038{
2039	apm_info.get_power_status_swabinminutes = 1;
2040	printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2041	       "in minutes and wrong byte order.\n");
2042	return 0;
2043}
2044
2045static struct dmi_system_id __initdata apm_dmi_table[] = {
2046	{
2047		print_if_true,
2048		KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2049		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2050			DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2051	},
2052	{	/* Handle problems with APM on the C600 */
2053		broken_ps2_resume, "Dell Latitude C600",
2054		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2055			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2056	},
2057	{	/* Allow interrupts during suspend on Dell Latitude laptops*/
2058		set_apm_ints, "Dell Latitude",
2059		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2060			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2061	},
2062	{	/* APM crashes */
2063		apm_is_horked, "Dell Inspiron 2500",
2064		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2065			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2066			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2067			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2068	},
2069	{	/* Allow interrupts during suspend on Dell Inspiron laptops*/
2070		set_apm_ints, "Dell Inspiron", {
2071			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2072			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2073	},
2074	{	/* Handle problems with APM on Inspiron 5000e */
2075		broken_apm_power, "Dell Inspiron 5000e",
2076		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2077			DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2078			DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2079	},
2080	{	/* Handle problems with APM on Inspiron 2500 */
2081		broken_apm_power, "Dell Inspiron 2500",
2082		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2083			DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2084			DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2085	},
2086	{	/* APM crashes */
2087		apm_is_horked, "Dell Dimension 4100",
2088		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2089			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2090			DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2091			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2092	},
2093	{	/* Allow interrupts during suspend on Compaq Laptops*/
2094		set_apm_ints, "Compaq 12XL125",
2095		{	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2096			DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2097			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2098			DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2099	},
2100	{	/* Allow interrupts during APM or the clock goes slow */
2101		set_apm_ints, "ASUSTeK",
2102		{	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2103			DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2104	},
2105	{	/* APM blows on shutdown */
2106		apm_is_horked, "ABIT KX7-333[R]",
2107		{	DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2108			DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2109	},
2110	{	/* APM crashes */
2111		apm_is_horked, "Trigem Delhi3",
2112		{	DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2113			DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2114	},
2115	{	/* APM crashes */
2116		apm_is_horked, "Fujitsu-Siemens",
2117		{	DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2118			DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2119	},
2120	{	/* APM crashes */
2121		apm_is_horked_d850md, "Intel D850MD",
2122		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2123			DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2124	},
2125	{	/* APM crashes */
2126		apm_is_horked, "Intel D810EMO",
2127		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2128			DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2129	},
2130	{	/* APM crashes */
2131		apm_is_horked, "Dell XPS-Z",
2132		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2133			DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2134			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2135	},
2136	{	/* APM crashes */
2137		apm_is_horked, "Sharp PC-PJ/AX",
2138		{	DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2139			DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2140			DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2141			DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2142	},
2143	{	/* APM crashes */
2144		apm_is_horked, "Dell Inspiron 2500",
2145		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2146			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2147			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2148			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2149	},
2150	{	/* APM idle hangs */
2151		apm_likes_to_melt, "Jabil AMD",
2152		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2153			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2154	},
2155	{	/* APM idle hangs */
2156		apm_likes_to_melt, "AMI Bios",
2157		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2158			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2159	},
2160	{	/* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2161		swab_apm_power_in_minutes, "Sony VAIO",
2162		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2163			DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2164			DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2165	},
2166	{	/* Handle problems with APM on Sony Vaio PCG-N505VX */
2167		swab_apm_power_in_minutes, "Sony VAIO",
2168		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169			DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2170			DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2171	},
2172	{	/* Handle problems with APM on Sony Vaio PCG-XG29 */
2173		swab_apm_power_in_minutes, "Sony VAIO",
2174		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2175			DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2176			DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2177	},
2178	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2179		swab_apm_power_in_minutes, "Sony VAIO",
2180		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2181			DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2182			DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2183	},
2184	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2185		swab_apm_power_in_minutes, "Sony VAIO",
2186		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2187			DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2188			DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2189	},
2190	{	/* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2191		swab_apm_power_in_minutes, "Sony VAIO",
2192		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2193			DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2194			DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2195	},
2196	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2197		swab_apm_power_in_minutes, "Sony VAIO",
2198		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2199			DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2200			DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2201	},
2202	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2203		swab_apm_power_in_minutes, "Sony VAIO",
2204		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2205			DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2206			DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2207	},
2208	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2209		swab_apm_power_in_minutes, "Sony VAIO",
2210		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2211			DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2212			DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2213	},
2214	{	/* Handle problems with APM on Sony Vaio PCG-F104K */
2215		swab_apm_power_in_minutes, "Sony VAIO",
2216		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2217			DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2218			DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2219	},
2220
2221	{	/* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2222		swab_apm_power_in_minutes, "Sony VAIO",
2223		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2224			DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2225			DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2226	},
2227	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2228		swab_apm_power_in_minutes, "Sony VAIO",
2229		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2230			DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2231			DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2232	},
2233	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2234		swab_apm_power_in_minutes, "Sony VAIO",
2235		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2236			DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2237			DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2238	},
2239	{	/* broken PM poweroff bios */
2240		set_realmode_power_off, "Award Software v4.60 PGMA",
2241		{	DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2242			DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2243			DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2244	},
2245
2246	/* Generic per vendor APM settings  */
2247
2248	{	/* Allow interrupts during suspend on IBM laptops */
2249		set_apm_ints, "IBM",
2250		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2251	},
2252
2253	{ }
2254};
2255
2256/*
2257 * Just start the APM thread. We do NOT want to do APM BIOS
2258 * calls from anything but the APM thread, if for no other reason
2259 * than the fact that we don't trust the APM BIOS. This way,
2260 * most common APM BIOS problems that lead to protection errors
2261 * etc will have at least some level of being contained...
2262 *
2263 * In short, if something bad happens, at least we have a choice
2264 * of just killing the apm thread..
2265 */
2266static int __init apm_init(void)
2267{
2268	struct desc_struct *gdt;
2269	int err;
2270
2271	dmi_check_system(apm_dmi_table);
2272
2273	if (apm_info.bios.version == 0 || machine_is_olpc()) {
2274		printk(KERN_INFO "apm: BIOS not found.\n");
2275		return -ENODEV;
2276	}
2277	printk(KERN_INFO
2278	       "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2279	       ((apm_info.bios.version >> 8) & 0xff),
2280	       (apm_info.bios.version & 0xff),
2281	       apm_info.bios.flags,
2282	       driver_version);
2283	if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2284		printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2285		return -ENODEV;
2286	}
2287
2288	if (allow_ints)
2289		apm_info.allow_ints = 1;
2290	if (broken_psr)
2291		apm_info.get_power_status_broken = 1;
2292	if (realmode_power_off)
2293		apm_info.realmode_power_off = 1;
2294	/* User can override, but default is to trust DMI */
2295	if (apm_disabled != -1)
2296		apm_info.disabled = apm_disabled;
2297
2298	/*
2299	 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2300	 * but is reportedly a 1.0 BIOS.
2301	 */
2302	if (apm_info.bios.version == 0x001)
2303		apm_info.bios.version = 0x100;
2304
2305	/* BIOS < 1.2 doesn't set cseg_16_len */
2306	if (apm_info.bios.version < 0x102)
2307		apm_info.bios.cseg_16_len = 0; /* 64k */
2308
2309	if (debug) {
2310		printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2311			apm_info.bios.cseg, apm_info.bios.offset,
2312			apm_info.bios.cseg_16, apm_info.bios.dseg);
2313		if (apm_info.bios.version > 0x100)
2314			printk(" cseg len %x, dseg len %x",
2315				apm_info.bios.cseg_len,
2316				apm_info.bios.dseg_len);
2317		if (apm_info.bios.version > 0x101)
2318			printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2319		printk("\n");
2320	}
2321
2322	if (apm_info.disabled) {
2323		pr_notice("disabled on user request.\n");
2324		return -ENODEV;
2325	}
2326	if ((num_online_cpus() > 1) && !power_off && !smp) {
2327		pr_notice("disabled - APM is not SMP safe.\n");
2328		apm_info.disabled = 1;
2329		return -ENODEV;
2330	}
2331	if (!acpi_disabled) {
2332		pr_notice("overridden by ACPI.\n");
2333		apm_info.disabled = 1;
2334		return -ENODEV;
2335	}
2336
2337	/*
2338	 * Set up the long jump entry point to the APM BIOS, which is called
2339	 * from inline assembly.
2340	 */
2341	apm_bios_entry.offset = apm_info.bios.offset;
2342	apm_bios_entry.segment = APM_CS;
2343
2344	/*
2345	 * The APM 1.1 BIOS is supposed to provide limit information that it
2346	 * recognizes.  Many machines do this correctly, but many others do
2347	 * not restrict themselves to their claimed limit.  When this happens,
2348	 * they will cause a segmentation violation in the kernel at boot time.
2349	 * Most BIOS's, however, will respect a 64k limit, so we use that.
2350	 *
2351	 * Note we only set APM segments on CPU zero, since we pin the APM
2352	 * code to that CPU.
2353	 */
2354	gdt = get_cpu_gdt_table(0);
2355	set_desc_base(&gdt[APM_CS >> 3],
2356		 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2357	set_desc_base(&gdt[APM_CS_16 >> 3],
2358		 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2359	set_desc_base(&gdt[APM_DS >> 3],
2360		 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2361
2362	proc_create("apm", 0, NULL, &apm_file_ops);
2363
2364	kapmd_task = kthread_create(apm, NULL, "kapmd");
2365	if (IS_ERR(kapmd_task)) {
2366		pr_err("disabled - Unable to start kernel thread\n");
2367		err = PTR_ERR(kapmd_task);
2368		kapmd_task = NULL;
2369		remove_proc_entry("apm", NULL);
2370		return err;
2371	}
2372	wake_up_process(kapmd_task);
2373
2374	if (num_online_cpus() > 1 && !smp) {
2375		printk(KERN_NOTICE
2376		       "apm: disabled - APM is not SMP safe (power off active).\n");
2377		return 0;
2378	}
2379
2380	/*
2381	 * Note we don't actually care if the misc_device cannot be registered.
2382	 * this driver can do its job without it, even if userspace can't
2383	 * control it.  just log the error
2384	 */
2385	if (misc_register(&apm_device))
2386		printk(KERN_WARNING "apm: Could not register misc device.\n");
2387
2388	if (HZ != 100)
2389		idle_period = (idle_period * HZ) / 100;
2390	if (idle_threshold < 100) {
 
2391		if (!cpuidle_register_driver(&apm_idle_driver))
2392			if (cpuidle_register_device(&apm_cpuidle_device))
2393				cpuidle_unregister_driver(&apm_idle_driver);
2394	}
2395
2396	return 0;
2397}
2398
2399static void __exit apm_exit(void)
2400{
2401	int error;
2402
2403	cpuidle_unregister_device(&apm_cpuidle_device);
2404	cpuidle_unregister_driver(&apm_idle_driver);
2405
2406	if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2407	    && (apm_info.connection_version > 0x0100)) {
2408		error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2409		if (error)
2410			apm_error("disengage power management", error);
2411	}
2412	misc_deregister(&apm_device);
2413	remove_proc_entry("apm", NULL);
2414	if (power_off)
2415		pm_power_off = NULL;
2416	if (kapmd_task) {
2417		kthread_stop(kapmd_task);
2418		kapmd_task = NULL;
2419	}
2420}
2421
2422module_init(apm_init);
2423module_exit(apm_exit);
2424
2425MODULE_AUTHOR("Stephen Rothwell");
2426MODULE_DESCRIPTION("Advanced Power Management");
2427MODULE_LICENSE("GPL");
2428module_param(debug, bool, 0644);
2429MODULE_PARM_DESC(debug, "Enable debug mode");
2430module_param(power_off, bool, 0444);
2431MODULE_PARM_DESC(power_off, "Enable power off");
2432module_param(bounce_interval, int, 0444);
2433MODULE_PARM_DESC(bounce_interval,
2434		"Set the number of ticks to ignore suspend bounces");
2435module_param(allow_ints, bool, 0444);
2436MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2437module_param(broken_psr, bool, 0444);
2438MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2439module_param(realmode_power_off, bool, 0444);
2440MODULE_PARM_DESC(realmode_power_off,
2441		"Switch to real mode before powering off");
2442module_param(idle_threshold, int, 0444);
2443MODULE_PARM_DESC(idle_threshold,
2444	"System idle percentage above which to make APM BIOS idle calls");
2445module_param(idle_period, int, 0444);
2446MODULE_PARM_DESC(idle_period,
2447	"Period (in sec/100) over which to caculate the idle percentage");
2448module_param(smp, bool, 0444);
2449MODULE_PARM_DESC(smp,
2450	"Set this to enable APM use on an SMP platform. Use with caution on older systems");
2451MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);