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v6.13.7
   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 initialisation 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#include <asm/ibt.h>
 236
 237#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
 238extern int (*console_blank_hook)(int);
 239#endif
 240
 241/*
 
 
 
 
 
 
 
 
 242 * Various options can be changed at boot time as follows:
 243 * (We allow underscores for compatibility with the modules code)
 244 *	apm=on/off			enable/disable APM
 245 *	    [no-]allow[-_]ints		allow interrupts during BIOS calls
 246 *	    [no-]broken[-_]psr		BIOS has a broken GetPowerStatus call
 247 *	    [no-]realmode[-_]power[-_]off	switch to real mode before
 248 *	    					powering off
 249 *	    [no-]debug			log some debugging messages
 250 *	    [no-]power[-_]off		power off on shutdown
 251 *	    [no-]smp			Use apm even on an SMP box
 252 *	    bounce[-_]interval=<n>	number of ticks to ignore suspend
 253 *	    				bounces
 254 *          idle[-_]threshold=<n>       System idle percentage above which to
 255 *                                      make APM BIOS idle calls. Set it to
 256 *                                      100 to disable.
 257 *          idle[-_]period=<n>          Period (in 1/100s of a second) over
 258 *                                      which the idle percentage is
 259 *                                      calculated.
 260 */
 261
 262/* KNOWN PROBLEM MACHINES:
 263 *
 264 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
 265 *                         [Confirmed by TI representative]
 266 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
 267 *                    [Confirmed by BIOS disassembly]
 268 *                    [This may work now ...]
 269 * P: Toshiba 1950S: battery life information only gets updated after resume
 270 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
 271 * 	broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
 272 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
 273 * 	Neale Banks <neale@lowendale.com.au> December 2000
 274 *
 275 * Legend: U = unusable with APM patches
 276 *         P = partially usable with APM patches
 277 */
 278
 279/*
 280 * Define as 1 to make the driver always call the APM BIOS busy
 281 * routine even if the clock was not reported as slowed by the
 282 * idle routine.  Otherwise, define as 0.
 283 */
 284#define ALWAYS_CALL_BUSY   1
 285
 286/*
 287 * Define to make the APM BIOS calls zero all data segment registers (so
 288 * that an incorrect BIOS implementation will cause a kernel panic if it
 289 * tries to write to arbitrary memory).
 290 */
 291#define APM_ZERO_SEGS
 292
 293#include <asm/apm.h>
 294
 295/*
 296 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
 297 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
 298 * David Chen <chen@ctpa04.mit.edu>
 299 */
 300#undef INIT_TIMER_AFTER_SUSPEND
 301
 302#ifdef INIT_TIMER_AFTER_SUSPEND
 303#include <linux/timex.h>
 304#include <asm/io.h>
 305#include <linux/delay.h>
 306#endif
 307
 308/*
 309 * Need to poll the APM BIOS every second
 310 */
 311#define APM_CHECK_TIMEOUT	(HZ)
 312
 313/*
 314 * Ignore suspend events for this amount of time after a resume
 315 */
 316#define DEFAULT_BOUNCE_INTERVAL	(3 * HZ)
 317
 318/*
 319 * Maximum number of events stored
 320 */
 321#define APM_MAX_EVENTS		20
 322
 323/*
 324 * The per-file APM data
 325 */
 326struct apm_user {
 327	int		magic;
 328	struct apm_user *next;
 329	unsigned int	suser: 1;
 330	unsigned int	writer: 1;
 331	unsigned int	reader: 1;
 332	unsigned int	suspend_wait: 1;
 333	int		suspend_result;
 334	int		suspends_pending;
 335	int		standbys_pending;
 336	int		suspends_read;
 337	int		standbys_read;
 338	int		event_head;
 339	int		event_tail;
 340	apm_event_t	events[APM_MAX_EVENTS];
 341};
 342
 343/*
 344 * The magic number in apm_user
 345 */
 346#define APM_BIOS_MAGIC		0x4101
 347
 348/*
 349 * idle percentage above which bios idle calls are done
 350 */
 351#ifdef CONFIG_APM_CPU_IDLE
 
 352#define DEFAULT_IDLE_THRESHOLD	95
 353#else
 354#define DEFAULT_IDLE_THRESHOLD	100
 355#endif
 356#define DEFAULT_IDLE_PERIOD	(100 / 3)
 357
 358static int apm_cpu_idle(struct cpuidle_device *dev,
 359			struct cpuidle_driver *drv, int index);
 360
 361static struct cpuidle_driver apm_idle_driver = {
 362	.name = "apm_idle",
 363	.owner = THIS_MODULE,
 364	.states = {
 365		{ /* entry 0 is for polling */ },
 366		{ /* entry 1 is for APM idle */
 367			.name = "APM",
 368			.desc = "APM idle",
 369			.exit_latency = 250,	/* WAG */
 370			.target_residency = 500,	/* WAG */
 371			.enter = &apm_cpu_idle
 372		},
 373	},
 374	.state_count = 2,
 375};
 376
 377static struct cpuidle_device apm_cpuidle_device;
 378
 379/*
 380 * Local variables
 381 */
 382__visible struct {
 383	unsigned long	offset;
 384	unsigned short	segment;
 385} apm_bios_entry;
 386static int clock_slowed;
 387static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
 388static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
 
 389static int suspends_pending;
 390static int standbys_pending;
 391static int ignore_sys_suspend;
 392static int ignore_normal_resume;
 393static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
 394
 395static bool debug __read_mostly;
 396static bool smp __read_mostly;
 397static int apm_disabled = -1;
 398#ifdef CONFIG_SMP
 399static bool power_off;
 400#else
 401static bool power_off = 1;
 402#endif
 403static bool realmode_power_off;
 404#ifdef CONFIG_APM_ALLOW_INTS
 405static bool allow_ints = 1;
 406#else
 407static bool allow_ints;
 408#endif
 409static bool broken_psr;
 410
 411static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
 412static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
 413static struct apm_user *user_list;
 414static DEFINE_SPINLOCK(user_list_lock);
 415static DEFINE_MUTEX(apm_mutex);
 416
 417/*
 418 * Set up a segment that references the real mode segment 0x40
 419 * that extends up to the end of page zero (that we have reserved).
 420 * This is for buggy BIOS's that refer to (real mode) segment 0x40
 421 * even though they are called in protected mode.
 422 */
 423static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(DESC_DATA32_BIOS,
 424			(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
 425
 426static const char driver_version[] = "1.16ac";	/* no spaces */
 427
 428static struct task_struct *kapmd_task;
 429
 430/*
 431 *	APM event names taken from the APM 1.2 specification. These are
 432 *	the message codes that the BIOS uses to tell us about events
 433 */
 434static const char * const apm_event_name[] = {
 435	"system standby",
 436	"system suspend",
 437	"normal resume",
 438	"critical resume",
 439	"low battery",
 440	"power status change",
 441	"update time",
 442	"critical suspend",
 443	"user standby",
 444	"user suspend",
 445	"system standby resume",
 446	"capabilities change"
 447};
 448#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
 449
 450typedef struct lookup_t {
 451	int	key;
 452	char 	*msg;
 453} lookup_t;
 454
 455/*
 456 *	The BIOS returns a set of standard error codes in AX when the
 457 *	carry flag is set.
 458 */
 459
 460static const lookup_t error_table[] = {
 461/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
 462	{ APM_DISABLED,		"Power management disabled" },
 463	{ APM_CONNECTED,	"Real mode interface already connected" },
 464	{ APM_NOT_CONNECTED,	"Interface not connected" },
 465	{ APM_16_CONNECTED,	"16 bit interface already connected" },
 466/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
 467	{ APM_32_CONNECTED,	"32 bit interface already connected" },
 468	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
 469	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
 470	{ APM_BAD_PARAM,	"Parameter out of range" },
 471	{ APM_NOT_ENGAGED,	"Interface not engaged" },
 472	{ APM_BAD_FUNCTION,     "Function not supported" },
 473	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
 474	{ APM_BAD_STATE,	"Unable to enter requested state" },
 475/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
 476	{ APM_NO_ERROR,		"BIOS did not set a return code" },
 477	{ APM_NOT_PRESENT,	"No APM present" }
 478};
 479#define ERROR_COUNT	ARRAY_SIZE(error_table)
 480
 481/**
 482 *	apm_error	-	display an APM error
 483 *	@str: information string
 484 *	@err: APM BIOS return code
 485 *
 486 *	Write a meaningful log entry to the kernel log in the event of
 487 *	an APM error.  Note that this also handles (negative) kernel errors.
 488 */
 489
 490static void apm_error(char *str, int err)
 491{
 492	int i;
 493
 494	for (i = 0; i < ERROR_COUNT; i++)
 495		if (error_table[i].key == err)
 496			break;
 497	if (i < ERROR_COUNT)
 498		pr_notice("%s: %s\n", str, error_table[i].msg);
 499	else if (err < 0)
 500		pr_notice("%s: linux error code %i\n", str, err);
 501	else
 502		pr_notice("%s: unknown error code %#2.2x\n",
 503		       str, err);
 504}
 505
 506/*
 507 * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
 508 * apm_info.allow_ints, we are being really paranoid here!  Not only
 509 * are interrupts disabled, but all the segment registers (except SS)
 510 * are saved and zeroed this means that if the BIOS tries to reference
 511 * any data without explicitly loading the segment registers, the kernel
 512 * will fault immediately rather than have some unforeseen circumstances
 513 * for the rest of the kernel.  And it will be very obvious!  :-) Doing
 514 * this depends on CS referring to the same physical memory as DS so that
 515 * DS can be zeroed before the call. Unfortunately, we can't do anything
 516 * about the stack segment/pointer.  Also, we tell the compiler that
 517 * everything could change.
 518 *
 519 * Also, we KNOW that for the non error case of apm_bios_call, there
 520 * is no useful data returned in the low order 8 bits of eax.
 521 */
 522
 523static inline unsigned long __apm_irq_save(void)
 524{
 525	unsigned long flags;
 526	local_save_flags(flags);
 527	if (apm_info.allow_ints) {
 528		if (irqs_disabled_flags(flags))
 529			local_irq_enable();
 530	} else
 531		local_irq_disable();
 532
 533	return flags;
 534}
 535
 536#define apm_irq_save(flags) \
 537	do { flags = __apm_irq_save(); } while (0)
 538
 539static inline void apm_irq_restore(unsigned long flags)
 540{
 541	if (irqs_disabled_flags(flags))
 542		local_irq_disable();
 543	else if (irqs_disabled())
 544		local_irq_enable();
 545}
 546
 547#ifdef APM_ZERO_SEGS
 548#	define APM_DECL_SEGS \
 549		unsigned int saved_fs; unsigned int saved_gs;
 550#	define APM_DO_SAVE_SEGS \
 551		savesegment(fs, saved_fs); savesegment(gs, saved_gs)
 552#	define APM_DO_RESTORE_SEGS \
 553		loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
 554#else
 555#	define APM_DECL_SEGS
 556#	define APM_DO_SAVE_SEGS
 557#	define APM_DO_RESTORE_SEGS
 558#endif
 559
 560struct apm_bios_call {
 561	u32 func;
 562	/* In and out */
 563	u32 ebx;
 564	u32 ecx;
 565	/* Out only */
 566	u32 eax;
 567	u32 edx;
 568	u32 esi;
 569
 570	/* Error: -ENOMEM, or bits 8-15 of eax */
 571	int err;
 572};
 573
 574/**
 575 *	__apm_bios_call - Make an APM BIOS 32bit call
 576 *	@_call: pointer to struct apm_bios_call.
 577 *
 578 *	Make an APM call using the 32bit protected mode interface. The
 579 *	caller is responsible for knowing if APM BIOS is configured and
 580 *	enabled. This call can disable interrupts for a long period of
 581 *	time on some laptops.  The return value is in AH and the carry
 582 *	flag is loaded into AL.  If there is an error, then the error
 583 *	code is returned in AH (bits 8-15 of eax) and this function
 584 *	returns non-zero.
 585 *
 586 *	Note: this makes the call on the current CPU.
 587 */
 588static long __apm_bios_call(void *_call)
 589{
 590	APM_DECL_SEGS
 591	unsigned long		flags;
 592	int			cpu;
 593	struct desc_struct	save_desc_40;
 594	struct desc_struct	*gdt;
 595	struct apm_bios_call	*call = _call;
 596	u64			ibt;
 597
 598	cpu = get_cpu();
 599	BUG_ON(cpu != 0);
 600	gdt = get_cpu_gdt_rw(cpu);
 601	save_desc_40 = gdt[0x40 / 8];
 602	gdt[0x40 / 8] = bad_bios_desc;
 603
 604	apm_irq_save(flags);
 605	firmware_restrict_branch_speculation_start();
 606	ibt = ibt_save(true);
 607	APM_DO_SAVE_SEGS;
 608	apm_bios_call_asm(call->func, call->ebx, call->ecx,
 609			  &call->eax, &call->ebx, &call->ecx, &call->edx,
 610			  &call->esi);
 611	APM_DO_RESTORE_SEGS;
 612	ibt_restore(ibt);
 613	firmware_restrict_branch_speculation_end();
 614	apm_irq_restore(flags);
 615	gdt[0x40 / 8] = save_desc_40;
 616	put_cpu();
 617
 618	return call->eax & 0xff;
 619}
 620
 621/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
 622static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
 623{
 624	int ret;
 625
 626	/* Don't bother with work_on_cpu in the common case, so we don't
 627	 * have to worry about OOM or overhead. */
 628	if (get_cpu() == 0) {
 629		ret = fn(call);
 630		put_cpu();
 631	} else {
 632		put_cpu();
 633		ret = work_on_cpu(0, fn, call);
 634	}
 635
 636	/* work_on_cpu can fail with -ENOMEM */
 637	if (ret < 0)
 638		call->err = ret;
 639	else
 640		call->err = (call->eax >> 8) & 0xff;
 641
 642	return ret;
 643}
 644
 645/**
 646 *	apm_bios_call	-	Make an APM BIOS 32bit call (on CPU 0)
 647 *	@call: the apm_bios_call registers.
 648 *
 649 *	If there is an error, it is returned in @call.err.
 650 */
 651static int apm_bios_call(struct apm_bios_call *call)
 652{
 653	return on_cpu0(__apm_bios_call, call);
 654}
 655
 656/**
 657 *	__apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
 658 *	@_call: pointer to struct apm_bios_call.
 659 *
 660 *	Make a BIOS call that returns one value only, or just status.
 661 *	If there is an error, then the error code is returned in AH
 662 *	(bits 8-15 of eax) and this function returns non-zero (it can
 663 *	also return -ENOMEM). This is used for simpler BIOS operations.
 664 *	This call may hold interrupts off for a long time on some laptops.
 665 *
 666 *	Note: this makes the call on the current CPU.
 667 */
 668static long __apm_bios_call_simple(void *_call)
 669{
 670	u8			error;
 671	APM_DECL_SEGS
 672	unsigned long		flags;
 673	int			cpu;
 674	struct desc_struct	save_desc_40;
 675	struct desc_struct	*gdt;
 676	struct apm_bios_call	*call = _call;
 677	u64			ibt;
 678
 679	cpu = get_cpu();
 680	BUG_ON(cpu != 0);
 681	gdt = get_cpu_gdt_rw(cpu);
 682	save_desc_40 = gdt[0x40 / 8];
 683	gdt[0x40 / 8] = bad_bios_desc;
 684
 685	apm_irq_save(flags);
 686	firmware_restrict_branch_speculation_start();
 687	ibt = ibt_save(true);
 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	ibt_restore(ibt);
 693	firmware_restrict_branch_speculation_end();
 694	apm_irq_restore(flags);
 695	gdt[0x40 / 8] = save_desc_40;
 696	put_cpu();
 697	return error;
 698}
 699
 700/**
 701 *	apm_bios_call_simple	-	make a simple APM BIOS 32bit call
 702 *	@func: APM function to invoke
 703 *	@ebx_in: EBX register value for BIOS call
 704 *	@ecx_in: ECX register value for BIOS call
 705 *	@eax: EAX register on return from the BIOS call
 706 *	@err: bits
 707 *
 708 *	Make a BIOS call that returns one value only, or just status.
 709 *	If there is an error, then the error code is returned in @err
 710 *	and this function returns non-zero. This is used for simpler
 711 *	BIOS operations.  This call may hold interrupts off for a long
 712 *	time on some laptops.
 713 */
 714static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
 715				int *err)
 716{
 717	struct apm_bios_call call;
 718	int ret;
 719
 720	call.func = func;
 721	call.ebx = ebx_in;
 722	call.ecx = ecx_in;
 723
 724	ret = on_cpu0(__apm_bios_call_simple, &call);
 725	*eax = call.eax;
 726	*err = call.err;
 727	return ret;
 728}
 729
 730/**
 731 *	apm_driver_version	-	APM driver version
 732 *	@val:	loaded with the APM version on return
 733 *
 734 *	Retrieve the APM version supported by the BIOS. This is only
 735 *	supported for APM 1.1 or higher. An error indicates APM 1.0 is
 736 *	probably present.
 737 *
 738 *	On entry val should point to a value indicating the APM driver
 739 *	version with the high byte being the major and the low byte the
 740 *	minor number both in BCD
 741 *
 742 *	On return it will hold the BIOS revision supported in the
 743 *	same format.
 744 */
 745
 746static int apm_driver_version(u_short *val)
 747{
 748	u32 eax;
 749	int err;
 750
 751	if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
 752		return err;
 753	*val = eax;
 754	return APM_SUCCESS;
 755}
 756
 757/**
 758 *	apm_get_event	-	get an APM event from the BIOS
 759 *	@event: pointer to the event
 760 *	@info: point to the event information
 761 *
 762 *	The APM BIOS provides a polled information for event
 763 *	reporting. The BIOS expects to be polled at least every second
 764 *	when events are pending. When a message is found the caller should
 765 *	poll until no more messages are present.  However, this causes
 766 *	problems on some laptops where a suspend event notification is
 767 *	not cleared until it is acknowledged.
 768 *
 769 *	Additional information is returned in the info pointer, providing
 770 *	that APM 1.2 is in use. If no messages are pending the value 0x80
 771 *	is returned (No power management events pending).
 772 */
 773static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
 774{
 775	struct apm_bios_call call;
 776
 777	call.func = APM_FUNC_GET_EVENT;
 778	call.ebx = call.ecx = 0;
 779
 780	if (apm_bios_call(&call))
 781		return call.err;
 782
 783	*event = call.ebx;
 784	if (apm_info.connection_version < 0x0102)
 785		*info = ~0; /* indicate info not valid */
 786	else
 787		*info = call.ecx;
 788	return APM_SUCCESS;
 789}
 790
 791/**
 792 *	set_power_state	-	set the power management state
 793 *	@what: which items to transition
 794 *	@state: state to transition to
 795 *
 796 *	Request an APM change of state for one or more system devices. The
 797 *	processor state must be transitioned last of all. what holds the
 798 *	class of device in the upper byte and the device number (0xFF for
 799 *	all) for the object to be transitioned.
 800 *
 801 *	The state holds the state to transition to, which may in fact
 802 *	be an acceptance of a BIOS requested state change.
 803 */
 804
 805static int set_power_state(u_short what, u_short state)
 806{
 807	u32 eax;
 808	int err;
 809
 810	if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
 811		return err;
 812	return APM_SUCCESS;
 813}
 814
 815/**
 816 *	set_system_power_state - set system wide power state
 817 *	@state: which state to enter
 818 *
 819 *	Transition the entire system into a new APM power state.
 820 */
 821
 822static int set_system_power_state(u_short state)
 823{
 824	return set_power_state(APM_DEVICE_ALL, state);
 825}
 826
 827/**
 828 *	apm_do_idle	-	perform power saving
 829 *
 830 *	This function notifies the BIOS that the processor is (in the view
 831 *	of the OS) idle. It returns -1 in the event that the BIOS refuses
 832 *	to handle the idle request. On a success the function returns 1
 833 *	if the BIOS did clock slowing or 0 otherwise.
 834 */
 835
 836static int apm_do_idle(void)
 837{
 838	u32 eax;
 839	u8 ret = 0;
 840	int idled = 0;
 
 841	int err = 0;
 842
 
 
 
 
 
 
 
 
 
 843	if (!need_resched()) {
 844		idled = 1;
 845		ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
 846	}
 
 
 847
 848	if (!idled)
 849		return 0;
 850
 851	if (ret) {
 852		static unsigned long t;
 853
 854		/* This always fails on some SMP boards running UP kernels.
 855		 * Only report the failure the first 5 times.
 856		 */
 857		if (++t < 5) {
 858			printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
 859			t = jiffies;
 860		}
 861		return -1;
 862	}
 863	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
 864	return clock_slowed;
 865}
 866
 867/**
 868 *	apm_do_busy	-	inform the BIOS the CPU is busy
 869 *
 870 *	Request that the BIOS brings the CPU back to full performance.
 871 */
 872
 873static void apm_do_busy(void)
 874{
 875	u32 dummy;
 876	int err;
 877
 878	if (clock_slowed || ALWAYS_CALL_BUSY) {
 879		(void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
 880		clock_slowed = 0;
 881	}
 882}
 883
 884/*
 885 * If no process has really been interested in
 886 * the CPU for some time, we want to call BIOS
 887 * power management - we probably want
 888 * to conserve power.
 889 */
 890#define IDLE_CALC_LIMIT	(HZ * 100)
 891#define IDLE_LEAKY_MAX	16
 892
 
 
 893/**
 894 * apm_cpu_idle		-	cpu idling for APM capable Linux
 895 *
 896 * This is the idling function the kernel executes when APM is available. It
 897 * tries to do BIOS powermanagement based on the average system idle time.
 898 * Furthermore it calls the system default idle routine.
 899 */
 900
 901static int apm_cpu_idle(struct cpuidle_device *dev,
 902	struct cpuidle_driver *drv, int index)
 903{
 904	static int use_apm_idle; /* = 0 */
 905	static unsigned int last_jiffies; /* = 0 */
 906	static u64 last_stime; /* = 0 */
 907	u64 stime, utime;
 908
 909	int apm_idle_done = 0;
 910	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
 911	unsigned int bucket;
 912
 
 913recalc:
 914	task_cputime(current, &utime, &stime);
 915	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
 916		use_apm_idle = 0;
 
 
 917	} else if (jiffies_since_last_check > idle_period) {
 918		unsigned int idle_percentage;
 919
 920		idle_percentage = nsecs_to_jiffies(stime - last_stime);
 921		idle_percentage *= 100;
 922		idle_percentage /= jiffies_since_last_check;
 923		use_apm_idle = (idle_percentage > idle_threshold);
 924		if (apm_info.forbid_idle)
 925			use_apm_idle = 0;
 
 
 926	}
 927
 928	last_jiffies = jiffies;
 929	last_stime = stime;
 930
 931	bucket = IDLE_LEAKY_MAX;
 932
 933	while (!need_resched()) {
 934		if (use_apm_idle) {
 935			unsigned int t;
 936
 937			t = jiffies;
 938			switch (apm_do_idle()) {
 939			case 0:
 940				apm_idle_done = 1;
 941				if (t != jiffies) {
 942					if (bucket) {
 943						bucket = IDLE_LEAKY_MAX;
 944						continue;
 945					}
 946				} else if (bucket) {
 947					bucket--;
 948					continue;
 949				}
 950				break;
 951			case 1:
 952				apm_idle_done = 1;
 953				break;
 954			default: /* BIOS refused */
 955				break;
 956			}
 957		}
 958		default_idle();
 
 
 
 959		local_irq_disable();
 960		jiffies_since_last_check = jiffies - last_jiffies;
 961		if (jiffies_since_last_check > idle_period)
 962			goto recalc;
 963	}
 964
 965	if (apm_idle_done)
 966		apm_do_busy();
 967
 968	return index;
 969}
 970
 971/**
 972 *	apm_power_off	-	ask the BIOS to power off
 973 *
 974 *	Handle the power off sequence. This is the one piece of code we
 975 *	will execute even on SMP machines. In order to deal with BIOS
 976 *	bugs we support real mode APM BIOS power off calls. We also make
 977 *	the SMP call on CPU0 as some systems will only honour this call
 978 *	on their first cpu.
 979 */
 980
 981static void apm_power_off(void)
 982{
 983	/* Some bioses don't like being called from CPU != 0 */
 984	if (apm_info.realmode_power_off) {
 985		set_cpus_allowed_ptr(current, cpumask_of(0));
 986		machine_real_restart(MRR_APM);
 987	} else {
 988		(void)set_system_power_state(APM_STATE_OFF);
 989	}
 990}
 991
 992#ifdef CONFIG_APM_DO_ENABLE
 993
 994/**
 995 *	apm_enable_power_management - enable BIOS APM power management
 996 *	@enable: enable yes/no
 997 *
 998 *	Enable or disable the APM BIOS power services.
 999 */
1000
1001static int apm_enable_power_management(int enable)
1002{
1003	u32 eax;
1004	int err;
1005
1006	if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1007		return APM_NOT_ENGAGED;
1008	if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1009				 enable, &eax, &err))
1010		return err;
1011	if (enable)
1012		apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1013	else
1014		apm_info.bios.flags |= APM_BIOS_DISABLED;
1015	return APM_SUCCESS;
1016}
1017#endif
1018
1019/**
1020 *	apm_get_power_status	-	get current power state
1021 *	@status: returned status
1022 *	@bat: battery info
1023 *	@life: estimated life
1024 *
1025 *	Obtain the current power status from the APM BIOS. We return a
1026 *	status which gives the rough battery status, and current power
1027 *	source. The bat value returned give an estimate as a percentage
1028 *	of life and a status value for the battery. The estimated life
1029 *	if reported is a lifetime in seconds/minutes at current power
1030 *	consumption.
1031 */
1032
1033static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1034{
1035	struct apm_bios_call call;
1036
1037	call.func = APM_FUNC_GET_STATUS;
1038	call.ebx = APM_DEVICE_ALL;
1039	call.ecx = 0;
1040
1041	if (apm_info.get_power_status_broken)
1042		return APM_32_UNSUPPORTED;
1043	if (apm_bios_call(&call)) {
1044		if (!call.err)
1045			return APM_NO_ERROR;
1046		return call.err;
1047	}
1048	*status = call.ebx;
1049	*bat = call.ecx;
1050	if (apm_info.get_power_status_swabinminutes) {
1051		*life = swab16((u16)call.edx);
1052		*life |= 0x8000;
1053	} else
1054		*life = call.edx;
1055	return APM_SUCCESS;
1056}
1057
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1058/**
1059 *	apm_engage_power_management	-	enable PM on a device
1060 *	@device: identity of device
1061 *	@enable: on/off
1062 *
1063 *	Activate or deactivate power management on either a specific device
1064 *	or the entire system (%APM_DEVICE_ALL).
1065 */
1066
1067static int apm_engage_power_management(u_short device, int enable)
1068{
1069	u32 eax;
1070	int err;
1071
1072	if ((enable == 0) && (device == APM_DEVICE_ALL)
1073	    && (apm_info.bios.flags & APM_BIOS_DISABLED))
1074		return APM_DISABLED;
1075	if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1076				 &eax, &err))
1077		return err;
1078	if (device == APM_DEVICE_ALL) {
1079		if (enable)
1080			apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1081		else
1082			apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1083	}
1084	return APM_SUCCESS;
1085}
1086
1087#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1088
1089/**
1090 *	apm_console_blank	-	blank the display
1091 *	@blank: on/off
1092 *
1093 *	Attempt to blank the console, firstly by blanking just video device
1094 *	zero, and if that fails (some BIOSes don't support it) then it blanks
1095 *	all video devices. Typically the BIOS will do laptop backlight and
1096 *	monitor powerdown for us.
1097 */
1098
1099static int apm_console_blank(int blank)
1100{
1101	int error = APM_NOT_ENGAGED; /* silence gcc */
1102	int i;
1103	u_short state;
1104	static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1105
1106	state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1107
1108	for (i = 0; i < ARRAY_SIZE(dev); i++) {
1109		error = set_power_state(dev[i], state);
1110
1111		if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1112			return 1;
1113
1114		if (error == APM_NOT_ENGAGED)
1115			break;
1116	}
1117
1118	if (error == APM_NOT_ENGAGED) {
1119		static int tried;
1120		int eng_error;
1121		if (tried++ == 0) {
1122			eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1123			if (eng_error) {
1124				apm_error("set display", error);
1125				apm_error("engage interface", eng_error);
1126				return 0;
1127			} else
1128				return apm_console_blank(blank);
1129		}
1130	}
1131	apm_error("set display", error);
1132	return 0;
1133}
1134#endif
1135
1136static int queue_empty(struct apm_user *as)
1137{
1138	return as->event_head == as->event_tail;
1139}
1140
1141static apm_event_t get_queued_event(struct apm_user *as)
1142{
1143	if (++as->event_tail >= APM_MAX_EVENTS)
1144		as->event_tail = 0;
1145	return as->events[as->event_tail];
1146}
1147
1148static void queue_event(apm_event_t event, struct apm_user *sender)
1149{
1150	struct apm_user *as;
1151
1152	spin_lock(&user_list_lock);
1153	if (user_list == NULL)
1154		goto out;
1155	for (as = user_list; as != NULL; as = as->next) {
1156		if ((as == sender) || (!as->reader))
1157			continue;
1158		if (++as->event_head >= APM_MAX_EVENTS)
1159			as->event_head = 0;
1160
1161		if (as->event_head == as->event_tail) {
1162			static int notified;
1163
1164			if (notified++ == 0)
1165				pr_err("an event queue overflowed\n");
1166			if (++as->event_tail >= APM_MAX_EVENTS)
1167				as->event_tail = 0;
1168		}
1169		as->events[as->event_head] = event;
1170		if (!as->suser || !as->writer)
1171			continue;
1172		switch (event) {
1173		case APM_SYS_SUSPEND:
1174		case APM_USER_SUSPEND:
1175			as->suspends_pending++;
1176			suspends_pending++;
1177			break;
1178
1179		case APM_SYS_STANDBY:
1180		case APM_USER_STANDBY:
1181			as->standbys_pending++;
1182			standbys_pending++;
1183			break;
1184		}
1185	}
1186	wake_up_interruptible(&apm_waitqueue);
1187out:
1188	spin_unlock(&user_list_lock);
1189}
1190
1191static void reinit_timer(void)
1192{
1193#ifdef INIT_TIMER_AFTER_SUSPEND
1194	unsigned long flags;
1195
1196	raw_spin_lock_irqsave(&i8253_lock, flags);
1197	/* set the clock to HZ */
1198	outb_p(0x34, PIT_MODE);		/* binary, mode 2, LSB/MSB, ch 0 */
1199	udelay(10);
1200	outb_p(LATCH & 0xff, PIT_CH0);	/* LSB */
1201	udelay(10);
1202	outb_p(LATCH >> 8, PIT_CH0);	/* MSB */
1203	udelay(10);
1204	raw_spin_unlock_irqrestore(&i8253_lock, flags);
1205#endif
1206}
1207
1208static int suspend(int vetoable)
1209{
1210	int err;
1211	struct apm_user	*as;
1212
1213	dpm_suspend_start(PMSG_SUSPEND);
1214	dpm_suspend_end(PMSG_SUSPEND);
 
1215
1216	local_irq_disable();
1217	syscore_suspend();
1218
1219	local_irq_enable();
1220
1221	save_processor_state();
1222	err = set_system_power_state(APM_STATE_SUSPEND);
1223	ignore_normal_resume = 1;
1224	restore_processor_state();
1225
1226	local_irq_disable();
1227	reinit_timer();
1228
1229	if (err == APM_NO_ERROR)
1230		err = APM_SUCCESS;
1231	if (err != APM_SUCCESS)
1232		apm_error("suspend", err);
1233	err = (err == APM_SUCCESS) ? 0 : -EIO;
1234
1235	syscore_resume();
1236	local_irq_enable();
1237
1238	dpm_resume_start(PMSG_RESUME);
1239	dpm_resume_end(PMSG_RESUME);
1240
 
1241	queue_event(APM_NORMAL_RESUME, NULL);
1242	spin_lock(&user_list_lock);
1243	for (as = user_list; as != NULL; as = as->next) {
1244		as->suspend_wait = 0;
1245		as->suspend_result = err;
1246	}
1247	spin_unlock(&user_list_lock);
1248	wake_up_interruptible(&apm_suspend_waitqueue);
1249	return err;
1250}
1251
1252static void standby(void)
1253{
1254	int err;
1255
1256	dpm_suspend_end(PMSG_SUSPEND);
1257
1258	local_irq_disable();
1259	syscore_suspend();
1260	local_irq_enable();
1261
1262	err = set_system_power_state(APM_STATE_STANDBY);
1263	if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1264		apm_error("standby", err);
1265
1266	local_irq_disable();
1267	syscore_resume();
1268	local_irq_enable();
1269
1270	dpm_resume_start(PMSG_RESUME);
1271}
1272
1273static apm_event_t get_event(void)
1274{
1275	int error;
1276	apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1277	apm_eventinfo_t	info;
1278
1279	static int notified;
1280
1281	/* we don't use the eventinfo */
1282	error = apm_get_event(&event, &info);
1283	if (error == APM_SUCCESS)
1284		return event;
1285
1286	if ((error != APM_NO_EVENTS) && (notified++ == 0))
1287		apm_error("get_event", error);
1288
1289	return 0;
1290}
1291
1292static void check_events(void)
1293{
1294	apm_event_t event;
1295	static unsigned long last_resume;
1296	static int ignore_bounce;
1297
1298	while ((event = get_event()) != 0) {
1299		if (debug) {
1300			if (event <= NR_APM_EVENT_NAME)
1301				printk(KERN_DEBUG "apm: received %s notify\n",
1302				       apm_event_name[event - 1]);
1303			else
1304				printk(KERN_DEBUG "apm: received unknown "
1305				       "event 0x%02x\n", event);
1306		}
1307		if (ignore_bounce
1308		    && (time_after(jiffies, last_resume + bounce_interval)))
1309			ignore_bounce = 0;
1310
1311		switch (event) {
1312		case APM_SYS_STANDBY:
1313		case APM_USER_STANDBY:
1314			queue_event(event, NULL);
1315			if (standbys_pending <= 0)
1316				standby();
1317			break;
1318
1319		case APM_USER_SUSPEND:
1320#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1321			if (apm_info.connection_version > 0x100)
1322				set_system_power_state(APM_STATE_REJECT);
1323			break;
1324#endif
1325		case APM_SYS_SUSPEND:
1326			if (ignore_bounce) {
1327				if (apm_info.connection_version > 0x100)
1328					set_system_power_state(APM_STATE_REJECT);
1329				break;
1330			}
1331			/*
1332			 * If we are already processing a SUSPEND,
1333			 * then further SUSPEND events from the BIOS
1334			 * will be ignored.  We also return here to
1335			 * cope with the fact that the Thinkpads keep
1336			 * sending a SUSPEND event until something else
1337			 * happens!
1338			 */
1339			if (ignore_sys_suspend)
1340				return;
1341			ignore_sys_suspend = 1;
1342			queue_event(event, NULL);
1343			if (suspends_pending <= 0)
1344				(void) suspend(1);
1345			break;
1346
1347		case APM_NORMAL_RESUME:
1348		case APM_CRITICAL_RESUME:
1349		case APM_STANDBY_RESUME:
1350			ignore_sys_suspend = 0;
1351			last_resume = jiffies;
1352			ignore_bounce = 1;
1353			if ((event != APM_NORMAL_RESUME)
1354			    || (ignore_normal_resume == 0)) {
1355				dpm_resume_end(PMSG_RESUME);
1356				queue_event(event, NULL);
1357			}
1358			ignore_normal_resume = 0;
1359			break;
1360
1361		case APM_CAPABILITY_CHANGE:
1362		case APM_LOW_BATTERY:
1363		case APM_POWER_STATUS_CHANGE:
1364			queue_event(event, NULL);
1365			/* If needed, notify drivers here */
1366			break;
1367
1368		case APM_UPDATE_TIME:
1369			break;
1370
1371		case APM_CRITICAL_SUSPEND:
1372			/*
1373			 * We are not allowed to reject a critical suspend.
1374			 */
1375			(void)suspend(0);
1376			break;
1377		}
1378	}
1379}
1380
1381static void apm_event_handler(void)
1382{
1383	static int pending_count = 4;
1384	int err;
1385
1386	if ((standbys_pending > 0) || (suspends_pending > 0)) {
1387		if ((apm_info.connection_version > 0x100) &&
1388		    (pending_count-- <= 0)) {
1389			pending_count = 4;
1390			if (debug)
1391				printk(KERN_DEBUG "apm: setting state busy\n");
1392			err = set_system_power_state(APM_STATE_BUSY);
1393			if (err)
1394				apm_error("busy", err);
1395		}
1396	} else
1397		pending_count = 4;
1398	check_events();
1399}
1400
1401/*
1402 * This is the APM thread main loop.
1403 */
1404
1405static void apm_mainloop(void)
1406{
1407	DECLARE_WAITQUEUE(wait, current);
1408
1409	add_wait_queue(&apm_waitqueue, &wait);
1410	set_current_state(TASK_INTERRUPTIBLE);
1411	for (;;) {
1412		schedule_timeout(APM_CHECK_TIMEOUT);
1413		if (kthread_should_stop())
1414			break;
1415		/*
1416		 * Ok, check all events, check for idle (and mark us sleeping
1417		 * so as not to count towards the load average)..
1418		 */
1419		set_current_state(TASK_INTERRUPTIBLE);
1420		apm_event_handler();
1421	}
1422	remove_wait_queue(&apm_waitqueue, &wait);
1423}
1424
1425static int check_apm_user(struct apm_user *as, const char *func)
1426{
1427	if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1428		pr_err("%s passed bad filp\n", func);
1429		return 1;
1430	}
1431	return 0;
1432}
1433
1434static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1435{
1436	struct apm_user *as;
1437	int i;
1438	apm_event_t event;
1439
1440	as = fp->private_data;
1441	if (check_apm_user(as, "read"))
1442		return -EIO;
1443	if ((int)count < sizeof(apm_event_t))
1444		return -EINVAL;
1445	if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1446		return -EAGAIN;
1447	wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1448	i = count;
1449	while ((i >= sizeof(event)) && !queue_empty(as)) {
1450		event = get_queued_event(as);
1451		if (copy_to_user(buf, &event, sizeof(event))) {
1452			if (i < count)
1453				break;
1454			return -EFAULT;
1455		}
1456		switch (event) {
1457		case APM_SYS_SUSPEND:
1458		case APM_USER_SUSPEND:
1459			as->suspends_read++;
1460			break;
1461
1462		case APM_SYS_STANDBY:
1463		case APM_USER_STANDBY:
1464			as->standbys_read++;
1465			break;
1466		}
1467		buf += sizeof(event);
1468		i -= sizeof(event);
1469	}
1470	if (i < count)
1471		return count - i;
1472	if (signal_pending(current))
1473		return -ERESTARTSYS;
1474	return 0;
1475}
1476
1477static __poll_t do_poll(struct file *fp, poll_table *wait)
1478{
1479	struct apm_user *as;
1480
1481	as = fp->private_data;
1482	if (check_apm_user(as, "poll"))
1483		return 0;
1484	poll_wait(fp, &apm_waitqueue, wait);
1485	if (!queue_empty(as))
1486		return EPOLLIN | EPOLLRDNORM;
1487	return 0;
1488}
1489
1490static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1491{
1492	struct apm_user *as;
1493	int ret;
1494
1495	as = filp->private_data;
1496	if (check_apm_user(as, "ioctl"))
1497		return -EIO;
1498	if (!as->suser || !as->writer)
1499		return -EPERM;
1500	switch (cmd) {
1501	case APM_IOC_STANDBY:
1502		mutex_lock(&apm_mutex);
1503		if (as->standbys_read > 0) {
1504			as->standbys_read--;
1505			as->standbys_pending--;
1506			standbys_pending--;
1507		} else
1508			queue_event(APM_USER_STANDBY, as);
1509		if (standbys_pending <= 0)
1510			standby();
1511		mutex_unlock(&apm_mutex);
1512		break;
1513	case APM_IOC_SUSPEND:
1514		mutex_lock(&apm_mutex);
1515		if (as->suspends_read > 0) {
1516			as->suspends_read--;
1517			as->suspends_pending--;
1518			suspends_pending--;
1519		} else
1520			queue_event(APM_USER_SUSPEND, as);
1521		if (suspends_pending <= 0) {
1522			ret = suspend(1);
1523			mutex_unlock(&apm_mutex);
1524		} else {
1525			as->suspend_wait = 1;
1526			mutex_unlock(&apm_mutex);
1527			wait_event_interruptible(apm_suspend_waitqueue,
1528					as->suspend_wait == 0);
1529			ret = as->suspend_result;
1530		}
1531		return ret;
1532	default:
1533		return -ENOTTY;
1534	}
1535	return 0;
1536}
1537
1538static int do_release(struct inode *inode, struct file *filp)
1539{
1540	struct apm_user *as;
1541
1542	as = filp->private_data;
1543	if (check_apm_user(as, "release"))
1544		return 0;
1545	filp->private_data = NULL;
1546	if (as->standbys_pending > 0) {
1547		standbys_pending -= as->standbys_pending;
1548		if (standbys_pending <= 0)
1549			standby();
1550	}
1551	if (as->suspends_pending > 0) {
1552		suspends_pending -= as->suspends_pending;
1553		if (suspends_pending <= 0)
1554			(void) suspend(1);
1555	}
1556	spin_lock(&user_list_lock);
1557	if (user_list == as)
1558		user_list = as->next;
1559	else {
1560		struct apm_user *as1;
1561
1562		for (as1 = user_list;
1563		     (as1 != NULL) && (as1->next != as);
1564		     as1 = as1->next)
1565			;
1566		if (as1 == NULL)
1567			pr_err("filp not in user list\n");
1568		else
1569			as1->next = as->next;
1570	}
1571	spin_unlock(&user_list_lock);
1572	kfree(as);
1573	return 0;
1574}
1575
1576static int do_open(struct inode *inode, struct file *filp)
1577{
1578	struct apm_user *as;
1579
1580	as = kmalloc(sizeof(*as), GFP_KERNEL);
1581	if (as == NULL)
 
 
1582		return -ENOMEM;
1583
1584	as->magic = APM_BIOS_MAGIC;
1585	as->event_tail = as->event_head = 0;
1586	as->suspends_pending = as->standbys_pending = 0;
1587	as->suspends_read = as->standbys_read = 0;
1588	/*
1589	 * XXX - this is a tiny bit broken, when we consider BSD
1590	 * process accounting. If the device is opened by root, we
1591	 * instantly flag that we used superuser privs. Who knows,
1592	 * we might close the device immediately without doing a
1593	 * privileged operation -- cevans
1594	 */
1595	as->suser = capable(CAP_SYS_ADMIN);
1596	as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1597	as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1598	spin_lock(&user_list_lock);
1599	as->next = user_list;
1600	user_list = as;
1601	spin_unlock(&user_list_lock);
1602	filp->private_data = as;
1603	return 0;
1604}
1605
1606#ifdef CONFIG_PROC_FS
1607static int proc_apm_show(struct seq_file *m, void *v)
1608{
1609	unsigned short	bx;
1610	unsigned short	cx;
1611	unsigned short	dx;
1612	int		error;
1613	unsigned short  ac_line_status = 0xff;
1614	unsigned short  battery_status = 0xff;
1615	unsigned short  battery_flag   = 0xff;
1616	int		percentage     = -1;
1617	int             time_units     = -1;
1618	char            *units         = "?";
1619
1620	if ((num_online_cpus() == 1) &&
1621	    !(error = apm_get_power_status(&bx, &cx, &dx))) {
1622		ac_line_status = (bx >> 8) & 0xff;
1623		battery_status = bx & 0xff;
1624		if ((cx & 0xff) != 0xff)
1625			percentage = cx & 0xff;
1626
1627		if (apm_info.connection_version > 0x100) {
1628			battery_flag = (cx >> 8) & 0xff;
1629			if (dx != 0xffff) {
1630				units = (dx & 0x8000) ? "min" : "sec";
1631				time_units = dx & 0x7fff;
1632			}
1633		}
1634	}
1635	/* Arguments, with symbols from linux/apm_bios.h.  Information is
1636	   from the Get Power Status (0x0a) call unless otherwise noted.
1637
1638	   0) Linux driver version (this will change if format changes)
1639	   1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
1640	   2) APM flags from APM Installation Check (0x00):
1641	      bit 0: APM_16_BIT_SUPPORT
1642	      bit 1: APM_32_BIT_SUPPORT
1643	      bit 2: APM_IDLE_SLOWS_CLOCK
1644	      bit 3: APM_BIOS_DISABLED
1645	      bit 4: APM_BIOS_DISENGAGED
1646	   3) AC line status
1647	      0x00: Off-line
1648	      0x01: On-line
1649	      0x02: On backup power (BIOS >= 1.1 only)
1650	      0xff: Unknown
1651	   4) Battery status
1652	      0x00: High
1653	      0x01: Low
1654	      0x02: Critical
1655	      0x03: Charging
1656	      0x04: Selected battery not present (BIOS >= 1.2 only)
1657	      0xff: Unknown
1658	   5) Battery flag
1659	      bit 0: High
1660	      bit 1: Low
1661	      bit 2: Critical
1662	      bit 3: Charging
1663	      bit 7: No system battery
1664	      0xff: Unknown
1665	   6) Remaining battery life (percentage of charge):
1666	      0-100: valid
1667	      -1: Unknown
1668	   7) Remaining battery life (time units):
1669	      Number of remaining minutes or seconds
1670	      -1: Unknown
1671	   8) min = minutes; sec = seconds */
1672
1673	seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1674		   driver_version,
1675		   (apm_info.bios.version >> 8) & 0xff,
1676		   apm_info.bios.version & 0xff,
1677		   apm_info.bios.flags,
1678		   ac_line_status,
1679		   battery_status,
1680		   battery_flag,
1681		   percentage,
1682		   time_units,
1683		   units);
1684	return 0;
1685}
1686#endif
 
 
 
 
 
 
 
 
 
 
 
 
1687
1688static int apm(void *unused)
1689{
1690	unsigned short	bx;
1691	unsigned short	cx;
1692	unsigned short	dx;
1693	int		error;
1694	char 		*power_stat;
1695	char 		*bat_stat;
1696
1697	/* 2002/08/01 - WT
1698	 * This is to avoid random crashes at boot time during initialization
1699	 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1700	 * Some bioses don't like being called from CPU != 0.
1701	 * Method suggested by Ingo Molnar.
1702	 */
1703	set_cpus_allowed_ptr(current, cpumask_of(0));
1704	BUG_ON(smp_processor_id() != 0);
1705
1706	if (apm_info.connection_version == 0) {
1707		apm_info.connection_version = apm_info.bios.version;
1708		if (apm_info.connection_version > 0x100) {
1709			/*
1710			 * We only support BIOSs up to version 1.2
1711			 */
1712			if (apm_info.connection_version > 0x0102)
1713				apm_info.connection_version = 0x0102;
1714			error = apm_driver_version(&apm_info.connection_version);
1715			if (error != APM_SUCCESS) {
1716				apm_error("driver version", error);
1717				/* Fall back to an APM 1.0 connection. */
1718				apm_info.connection_version = 0x100;
1719			}
1720		}
1721	}
1722
1723	if (debug)
1724		printk(KERN_INFO "apm: Connection version %d.%d\n",
1725			(apm_info.connection_version >> 8) & 0xff,
1726			apm_info.connection_version & 0xff);
1727
1728#ifdef CONFIG_APM_DO_ENABLE
1729	if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1730		/*
1731		 * This call causes my NEC UltraLite Versa 33/C to hang if it
1732		 * is booted with PM disabled but not in the docking station.
1733		 * Unfortunate ...
1734		 */
1735		error = apm_enable_power_management(1);
1736		if (error) {
1737			apm_error("enable power management", error);
1738			return -1;
1739		}
1740	}
1741#endif
1742
1743	if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1744	    && (apm_info.connection_version > 0x0100)) {
1745		error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1746		if (error) {
1747			apm_error("engage power management", error);
1748			return -1;
1749		}
1750	}
1751
1752	if (debug && (num_online_cpus() == 1 || smp)) {
1753		error = apm_get_power_status(&bx, &cx, &dx);
1754		if (error)
1755			printk(KERN_INFO "apm: power status not available\n");
1756		else {
1757			switch ((bx >> 8) & 0xff) {
1758			case 0:
1759				power_stat = "off line";
1760				break;
1761			case 1:
1762				power_stat = "on line";
1763				break;
1764			case 2:
1765				power_stat = "on backup power";
1766				break;
1767			default:
1768				power_stat = "unknown";
1769				break;
1770			}
1771			switch (bx & 0xff) {
1772			case 0:
1773				bat_stat = "high";
1774				break;
1775			case 1:
1776				bat_stat = "low";
1777				break;
1778			case 2:
1779				bat_stat = "critical";
1780				break;
1781			case 3:
1782				bat_stat = "charging";
1783				break;
1784			default:
1785				bat_stat = "unknown";
1786				break;
1787			}
1788			printk(KERN_INFO
1789			       "apm: AC %s, battery status %s, battery life ",
1790			       power_stat, bat_stat);
1791			if ((cx & 0xff) == 0xff)
1792				printk("unknown\n");
1793			else
1794				printk("%d%%\n", cx & 0xff);
1795			if (apm_info.connection_version > 0x100) {
1796				printk(KERN_INFO
1797				       "apm: battery flag 0x%02x, battery life ",
1798				       (cx >> 8) & 0xff);
1799				if (dx == 0xffff)
1800					printk("unknown\n");
1801				else
1802					printk("%d %s\n", dx & 0x7fff,
1803					       (dx & 0x8000) ?
1804					       "minutes" : "seconds");
1805			}
1806		}
1807	}
1808
1809	/* Install our power off handler.. */
1810	if (power_off)
1811		pm_power_off = apm_power_off;
1812
1813	if (num_online_cpus() == 1 || smp) {
1814#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1815		console_blank_hook = apm_console_blank;
1816#endif
1817		apm_mainloop();
1818#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1819		console_blank_hook = NULL;
1820#endif
1821	}
1822
1823	return 0;
1824}
1825
1826#ifndef MODULE
1827static int __init apm_setup(char *str)
1828{
1829	int invert;
1830
1831	while ((str != NULL) && (*str != '\0')) {
1832		if (strncmp(str, "off", 3) == 0)
1833			apm_disabled = 1;
1834		if (strncmp(str, "on", 2) == 0)
1835			apm_disabled = 0;
1836		if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1837		    (strncmp(str, "bounce_interval=", 16) == 0))
1838			bounce_interval = simple_strtol(str + 16, NULL, 0);
1839		if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1840		    (strncmp(str, "idle_threshold=", 15) == 0))
1841			idle_threshold = simple_strtol(str + 15, NULL, 0);
1842		if ((strncmp(str, "idle-period=", 12) == 0) ||
1843		    (strncmp(str, "idle_period=", 12) == 0))
1844			idle_period = simple_strtol(str + 12, NULL, 0);
1845		invert = (strncmp(str, "no-", 3) == 0) ||
1846			(strncmp(str, "no_", 3) == 0);
1847		if (invert)
1848			str += 3;
1849		if (strncmp(str, "debug", 5) == 0)
1850			debug = !invert;
1851		if ((strncmp(str, "power-off", 9) == 0) ||
1852		    (strncmp(str, "power_off", 9) == 0))
1853			power_off = !invert;
1854		if (strncmp(str, "smp", 3) == 0) {
1855			smp = !invert;
1856			idle_threshold = 100;
1857		}
1858		if ((strncmp(str, "allow-ints", 10) == 0) ||
1859		    (strncmp(str, "allow_ints", 10) == 0))
1860			apm_info.allow_ints = !invert;
1861		if ((strncmp(str, "broken-psr", 10) == 0) ||
1862		    (strncmp(str, "broken_psr", 10) == 0))
1863			apm_info.get_power_status_broken = !invert;
1864		if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1865		    (strncmp(str, "realmode_power_off", 18) == 0))
1866			apm_info.realmode_power_off = !invert;
1867		str = strchr(str, ',');
1868		if (str != NULL)
1869			str += strspn(str, ", \t");
1870	}
1871	return 1;
1872}
1873
1874__setup("apm=", apm_setup);
1875#endif
1876
1877static const struct file_operations apm_bios_fops = {
1878	.owner		= THIS_MODULE,
1879	.read		= do_read,
1880	.poll		= do_poll,
1881	.unlocked_ioctl	= do_ioctl,
1882	.open		= do_open,
1883	.release	= do_release,
1884	.llseek		= noop_llseek,
1885};
1886
1887static struct miscdevice apm_device = {
1888	APM_MINOR_DEV,
1889	"apm_bios",
1890	&apm_bios_fops
1891};
1892
1893
1894/* Simple "print if true" callback */
1895static int __init print_if_true(const struct dmi_system_id *d)
1896{
1897	printk("%s\n", d->ident);
1898	return 0;
1899}
1900
1901/*
1902 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1903 * disabled before the suspend. Linux used to get terribly confused by that.
1904 */
1905static int __init broken_ps2_resume(const struct dmi_system_id *d)
1906{
1907	printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1908	       "workaround hopefully not needed.\n", d->ident);
1909	return 0;
1910}
1911
1912/* Some bioses have a broken protected mode poweroff and need to use realmode */
1913static int __init set_realmode_power_off(const struct dmi_system_id *d)
1914{
1915	if (apm_info.realmode_power_off == 0) {
1916		apm_info.realmode_power_off = 1;
1917		printk(KERN_INFO "%s bios detected. "
1918		       "Using realmode poweroff only.\n", d->ident);
1919	}
1920	return 0;
1921}
1922
1923/* Some laptops require interrupts to be enabled during APM calls */
1924static int __init set_apm_ints(const struct dmi_system_id *d)
1925{
1926	if (apm_info.allow_ints == 0) {
1927		apm_info.allow_ints = 1;
1928		printk(KERN_INFO "%s machine detected. "
1929		       "Enabling interrupts during APM calls.\n", d->ident);
1930	}
1931	return 0;
1932}
1933
1934/* Some APM bioses corrupt memory or just plain do not work */
1935static int __init apm_is_horked(const struct dmi_system_id *d)
1936{
1937	if (apm_info.disabled == 0) {
1938		apm_info.disabled = 1;
1939		printk(KERN_INFO "%s machine detected. "
1940		       "Disabling APM.\n", d->ident);
1941	}
1942	return 0;
1943}
1944
1945static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1946{
1947	if (apm_info.disabled == 0) {
1948		apm_info.disabled = 1;
1949		printk(KERN_INFO "%s machine detected. "
1950		       "Disabling APM.\n", d->ident);
1951		printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1952		printk(KERN_INFO "download from support.intel.com\n");
1953	}
1954	return 0;
1955}
1956
1957/* Some APM bioses hang on APM idle calls */
1958static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1959{
1960	if (apm_info.forbid_idle == 0) {
1961		apm_info.forbid_idle = 1;
1962		printk(KERN_INFO "%s machine detected. "
1963		       "Disabling APM idle calls.\n", d->ident);
1964	}
1965	return 0;
1966}
1967
1968/*
1969 *  Check for clue free BIOS implementations who use
1970 *  the following QA technique
1971 *
1972 *      [ Write BIOS Code ]<------
1973 *               |                ^
1974 *      < Does it Compile >----N--
1975 *               |Y               ^
1976 *	< Does it Boot Win98 >-N--
1977 *               |Y
1978 *           [Ship It]
1979 *
1980 *	Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
1981 *	Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
1982 */
1983static int __init broken_apm_power(const struct dmi_system_id *d)
1984{
1985	apm_info.get_power_status_broken = 1;
1986	printk(KERN_WARNING "BIOS strings suggest APM bugs, "
1987	       "disabling power status reporting.\n");
1988	return 0;
1989}
1990
1991/*
1992 * This bios swaps the APM minute reporting bytes over (Many sony laptops
1993 * have this problem).
1994 */
1995static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
1996{
1997	apm_info.get_power_status_swabinminutes = 1;
1998	printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
1999	       "in minutes and wrong byte order.\n");
2000	return 0;
2001}
2002
2003static const struct dmi_system_id apm_dmi_table[] __initconst = {
2004	{
2005		print_if_true,
2006		KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2007		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2008			DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2009	},
2010	{	/* Handle problems with APM on the C600 */
2011		broken_ps2_resume, "Dell Latitude C600",
2012		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2013			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2014	},
2015	{	/* Allow interrupts during suspend on Dell Latitude laptops*/
2016		set_apm_ints, "Dell Latitude",
2017		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2018			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2019	},
2020	{	/* APM crashes */
2021		apm_is_horked, "Dell Inspiron 2500",
2022		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2023			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2024			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2025			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2026	},
2027	{	/* Allow interrupts during suspend on Dell Inspiron laptops*/
2028		set_apm_ints, "Dell Inspiron", {
2029			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2030			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2031	},
2032	{	/* Handle problems with APM on Inspiron 5000e */
2033		broken_apm_power, "Dell Inspiron 5000e",
2034		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2035			DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2036			DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2037	},
2038	{	/* Handle problems with APM on Inspiron 2500 */
2039		broken_apm_power, "Dell Inspiron 2500",
2040		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2041			DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2042			DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2043	},
2044	{	/* APM crashes */
2045		apm_is_horked, "Dell Dimension 4100",
2046		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2047			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2048			DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2049			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2050	},
2051	{	/* Allow interrupts during suspend on Compaq Laptops*/
2052		set_apm_ints, "Compaq 12XL125",
2053		{	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2054			DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2055			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2056			DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2057	},
2058	{	/* Allow interrupts during APM or the clock goes slow */
2059		set_apm_ints, "ASUSTeK",
2060		{	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2061			DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2062	},
2063	{	/* APM blows on shutdown */
2064		apm_is_horked, "ABIT KX7-333[R]",
2065		{	DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2066			DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2067	},
2068	{	/* APM crashes */
2069		apm_is_horked, "Trigem Delhi3",
2070		{	DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2071			DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2072	},
2073	{	/* APM crashes */
2074		apm_is_horked, "Fujitsu-Siemens",
2075		{	DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2076			DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2077	},
2078	{	/* APM crashes */
2079		apm_is_horked_d850md, "Intel D850MD",
2080		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2081			DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2082	},
2083	{	/* APM crashes */
2084		apm_is_horked, "Intel D810EMO",
2085		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2086			DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2087	},
2088	{	/* APM crashes */
2089		apm_is_horked, "Dell XPS-Z",
2090		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2091			DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2092			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2093	},
2094	{	/* APM crashes */
2095		apm_is_horked, "Sharp PC-PJ/AX",
2096		{	DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2097			DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2098			DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2099			DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2100	},
2101	{	/* APM crashes */
2102		apm_is_horked, "Dell Inspiron 2500",
2103		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2104			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2105			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2106			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2107	},
2108	{	/* APM idle hangs */
2109		apm_likes_to_melt, "Jabil AMD",
2110		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2111			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2112	},
2113	{	/* APM idle hangs */
2114		apm_likes_to_melt, "AMI Bios",
2115		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2116			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2117	},
2118	{	/* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2119		swab_apm_power_in_minutes, "Sony VAIO",
2120		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2121			DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2122			DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2123	},
2124	{	/* Handle problems with APM on Sony Vaio PCG-N505VX */
2125		swab_apm_power_in_minutes, "Sony VAIO",
2126		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2127			DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2128			DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2129	},
2130	{	/* Handle problems with APM on Sony Vaio PCG-XG29 */
2131		swab_apm_power_in_minutes, "Sony VAIO",
2132		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2133			DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2134			DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2135	},
2136	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2137		swab_apm_power_in_minutes, "Sony VAIO",
2138		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2139			DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2140			DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2141	},
2142	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2143		swab_apm_power_in_minutes, "Sony VAIO",
2144		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2145			DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2146			DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2147	},
2148	{	/* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2149		swab_apm_power_in_minutes, "Sony VAIO",
2150		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2151			DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2152			DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2153	},
2154	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2155		swab_apm_power_in_minutes, "Sony VAIO",
2156		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2157			DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2158			DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2159	},
2160	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2161		swab_apm_power_in_minutes, "Sony VAIO",
2162		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2163			DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2164			DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2165	},
2166	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2167		swab_apm_power_in_minutes, "Sony VAIO",
2168		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2169			DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2170			DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2171	},
2172	{	/* Handle problems with APM on Sony Vaio PCG-F104K */
2173		swab_apm_power_in_minutes, "Sony VAIO",
2174		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2175			DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2176			DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2177	},
2178
2179	{	/* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2180		swab_apm_power_in_minutes, "Sony VAIO",
2181		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2182			DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2183			DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2184	},
2185	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2186		swab_apm_power_in_minutes, "Sony VAIO",
2187		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2188			DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2189			DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2190	},
2191	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2192		swab_apm_power_in_minutes, "Sony VAIO",
2193		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2194			DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2195			DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2196	},
2197	{	/* broken PM poweroff bios */
2198		set_realmode_power_off, "Award Software v4.60 PGMA",
2199		{	DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2200			DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2201			DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2202	},
2203
2204	/* Generic per vendor APM settings  */
2205
2206	{	/* Allow interrupts during suspend on IBM laptops */
2207		set_apm_ints, "IBM",
2208		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2209	},
2210
2211	{ }
2212};
2213
2214/*
2215 * Just start the APM thread. We do NOT want to do APM BIOS
2216 * calls from anything but the APM thread, if for no other reason
2217 * than the fact that we don't trust the APM BIOS. This way,
2218 * most common APM BIOS problems that lead to protection errors
2219 * etc will have at least some level of being contained...
2220 *
2221 * In short, if something bad happens, at least we have a choice
2222 * of just killing the apm thread..
2223 */
2224static int __init apm_init(void)
2225{
2226	struct desc_struct *gdt;
2227	int err;
2228
2229	dmi_check_system(apm_dmi_table);
2230
2231	if (apm_info.bios.version == 0 || machine_is_olpc()) {
2232		printk(KERN_INFO "apm: BIOS not found.\n");
2233		return -ENODEV;
2234	}
2235	printk(KERN_INFO
2236	       "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2237	       ((apm_info.bios.version >> 8) & 0xff),
2238	       (apm_info.bios.version & 0xff),
2239	       apm_info.bios.flags,
2240	       driver_version);
2241	if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2242		printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2243		return -ENODEV;
2244	}
2245
2246	if (allow_ints)
2247		apm_info.allow_ints = 1;
2248	if (broken_psr)
2249		apm_info.get_power_status_broken = 1;
2250	if (realmode_power_off)
2251		apm_info.realmode_power_off = 1;
2252	/* User can override, but default is to trust DMI */
2253	if (apm_disabled != -1)
2254		apm_info.disabled = apm_disabled;
2255
2256	/*
2257	 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2258	 * but is reportedly a 1.0 BIOS.
2259	 */
2260	if (apm_info.bios.version == 0x001)
2261		apm_info.bios.version = 0x100;
2262
2263	/* BIOS < 1.2 doesn't set cseg_16_len */
2264	if (apm_info.bios.version < 0x102)
2265		apm_info.bios.cseg_16_len = 0; /* 64k */
2266
2267	if (debug) {
2268		printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2269			apm_info.bios.cseg, apm_info.bios.offset,
2270			apm_info.bios.cseg_16, apm_info.bios.dseg);
2271		if (apm_info.bios.version > 0x100)
2272			printk(" cseg len %x, dseg len %x",
2273				apm_info.bios.cseg_len,
2274				apm_info.bios.dseg_len);
2275		if (apm_info.bios.version > 0x101)
2276			printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2277		printk("\n");
2278	}
2279
2280	if (apm_info.disabled) {
2281		pr_notice("disabled on user request.\n");
2282		return -ENODEV;
2283	}
2284	if ((num_online_cpus() > 1) && !power_off && !smp) {
2285		pr_notice("disabled - APM is not SMP safe.\n");
2286		apm_info.disabled = 1;
2287		return -ENODEV;
2288	}
2289	if (!acpi_disabled) {
2290		pr_notice("overridden by ACPI.\n");
2291		apm_info.disabled = 1;
2292		return -ENODEV;
2293	}
2294
2295	/*
2296	 * Set up the long jump entry point to the APM BIOS, which is called
2297	 * from inline assembly.
2298	 */
2299	apm_bios_entry.offset = apm_info.bios.offset;
2300	apm_bios_entry.segment = APM_CS;
2301
2302	/*
2303	 * The APM 1.1 BIOS is supposed to provide limit information that it
2304	 * recognizes.  Many machines do this correctly, but many others do
2305	 * not restrict themselves to their claimed limit.  When this happens,
2306	 * they will cause a segmentation violation in the kernel at boot time.
2307	 * Most BIOS's, however, will respect a 64k limit, so we use that.
2308	 *
2309	 * Note we only set APM segments on CPU zero, since we pin the APM
2310	 * code to that CPU.
2311	 */
2312	gdt = get_cpu_gdt_rw(0);
2313	set_desc_base(&gdt[APM_CS >> 3],
2314		 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2315	set_desc_base(&gdt[APM_CS_16 >> 3],
2316		 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2317	set_desc_base(&gdt[APM_DS >> 3],
2318		 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2319
2320	proc_create_single("apm", 0, NULL, proc_apm_show);
2321
2322	kapmd_task = kthread_create(apm, NULL, "kapmd");
2323	if (IS_ERR(kapmd_task)) {
2324		pr_err("disabled - Unable to start kernel thread\n");
 
2325		err = PTR_ERR(kapmd_task);
2326		kapmd_task = NULL;
2327		remove_proc_entry("apm", NULL);
2328		return err;
2329	}
2330	wake_up_process(kapmd_task);
2331
2332	if (num_online_cpus() > 1 && !smp) {
2333		printk(KERN_NOTICE
2334		       "apm: disabled - APM is not SMP safe (power off active).\n");
2335		return 0;
2336	}
2337
2338	/*
2339	 * Note we don't actually care if the misc_device cannot be registered.
2340	 * this driver can do its job without it, even if userspace can't
2341	 * control it.  just log the error
2342	 */
2343	if (misc_register(&apm_device))
2344		printk(KERN_WARNING "apm: Could not register misc device.\n");
2345
2346	if (HZ != 100)
2347		idle_period = (idle_period * HZ) / 100;
2348	if (idle_threshold < 100) {
2349		cpuidle_poll_state_init(&apm_idle_driver);
2350		if (!cpuidle_register_driver(&apm_idle_driver))
2351			if (cpuidle_register_device(&apm_cpuidle_device))
2352				cpuidle_unregister_driver(&apm_idle_driver);
2353	}
2354
2355	return 0;
2356}
2357
2358static void __exit apm_exit(void)
2359{
2360	int error;
2361
2362	cpuidle_unregister_device(&apm_cpuidle_device);
2363	cpuidle_unregister_driver(&apm_idle_driver);
2364
 
 
 
 
 
 
2365	if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2366	    && (apm_info.connection_version > 0x0100)) {
2367		error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2368		if (error)
2369			apm_error("disengage power management", error);
2370	}
2371	misc_deregister(&apm_device);
2372	remove_proc_entry("apm", NULL);
2373	if (power_off)
2374		pm_power_off = NULL;
2375	if (kapmd_task) {
2376		kthread_stop(kapmd_task);
2377		kapmd_task = NULL;
2378	}
2379}
2380
2381module_init(apm_init);
2382module_exit(apm_exit);
2383
2384MODULE_AUTHOR("Stephen Rothwell");
2385MODULE_DESCRIPTION("Advanced Power Management");
2386MODULE_LICENSE("GPL");
2387module_param(debug, bool, 0644);
2388MODULE_PARM_DESC(debug, "Enable debug mode");
2389module_param(power_off, bool, 0444);
2390MODULE_PARM_DESC(power_off, "Enable power off");
2391module_param(bounce_interval, int, 0444);
2392MODULE_PARM_DESC(bounce_interval,
2393		"Set the number of ticks to ignore suspend bounces");
2394module_param(allow_ints, bool, 0444);
2395MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2396module_param(broken_psr, bool, 0444);
2397MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2398module_param(realmode_power_off, bool, 0444);
2399MODULE_PARM_DESC(realmode_power_off,
2400		"Switch to real mode before powering off");
2401module_param(idle_threshold, int, 0444);
2402MODULE_PARM_DESC(idle_threshold,
2403	"System idle percentage above which to make APM BIOS idle calls");
2404module_param(idle_period, int, 0444);
2405MODULE_PARM_DESC(idle_period,
2406	"Period (in sec/100) over which to calculate the idle percentage");
2407module_param(smp, bool, 0444);
2408MODULE_PARM_DESC(smp,
2409	"Set this to enable APM use on an SMP platform. Use with caution on older systems");
2410MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
v3.1
 
   1/* -*- linux-c -*-
   2 * APM BIOS driver for Linux
   3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
   4 *
   5 * Initial development of this driver was funded by NEC Australia P/L
   6 *	and NEC Corporation
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under the terms of the GNU General Public License as published by the
  10 * Free Software Foundation; either version 2, or (at your option) any
  11 * later version.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * October 1995, Rik Faith (faith@cs.unc.edu):
  19 *    Minor enhancements and updates (to the patch set) for 1.3.x
  20 *    Documentation
  21 * January 1996, Rik Faith (faith@cs.unc.edu):
  22 *    Make /proc/apm easy to format (bump driver version)
  23 * March 1996, Rik Faith (faith@cs.unc.edu):
  24 *    Prohibit APM BIOS calls unless apm_enabled.
  25 *    (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
  26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
  27 *    Version 1.0 and 1.1
  28 * May 1996, Version 1.2
  29 * Feb 1998, Version 1.3
  30 * Feb 1998, Version 1.4
  31 * Aug 1998, Version 1.5
  32 * Sep 1998, Version 1.6
  33 * Nov 1998, Version 1.7
  34 * Jan 1999, Version 1.8
  35 * Jan 1999, Version 1.9
  36 * Oct 1999, Version 1.10
  37 * Nov 1999, Version 1.11
  38 * Jan 2000, Version 1.12
  39 * Feb 2000, Version 1.13
  40 * Nov 2000, Version 1.14
  41 * Oct 2001, Version 1.15
  42 * Jan 2002, Version 1.16
  43 * Oct 2002, Version 1.16ac
  44 *
  45 * History:
  46 *    0.6b: first version in official kernel, Linux 1.3.46
  47 *    0.7: changed /proc/apm format, Linux 1.3.58
  48 *    0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
  49 *    0.9: only call bios if bios is present, Linux 1.3.72
  50 *    1.0: use fixed device number, consolidate /proc/apm into this file,
  51 *         Linux 1.3.85
  52 *    1.1: support user-space standby and suspend, power off after system
  53 *         halted, Linux 1.3.98
  54 *    1.2: When resetting RTC after resume, take care so that the time
  55 *         is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
  56 *         <jtoth@princeton.edu>); improve interaction between
  57 *         screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
  58 *    1.2a:Simple change to stop mysterious bug reports with SMP also added
  59 *	   levels to the printk calls. APM is not defined for SMP machines.
  60 *         The new replacement for it is, but Linux doesn't yet support this.
  61 *         Alan Cox Linux 2.1.55
  62 *    1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
  63 *    1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
  64 *         Dean Gaudet <dgaudet@arctic.org>.
  65 *         C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
  66 *    1.5: Fix segment register reloading (in case of bad segments saved
  67 *         across BIOS call).
  68 *         Stephen Rothwell
  69 *    1.6: Cope with compiler/assembler differences.
  70 *         Only try to turn off the first display device.
  71 *         Fix OOPS at power off with no APM BIOS by Jan Echternach
  72 *                   <echter@informatik.uni-rostock.de>
  73 *         Stephen Rothwell
  74 *    1.7: Modify driver's cached copy of the disabled/disengaged flags
  75 *         to reflect current state of APM BIOS.
  76 *         Chris Rankin <rankinc@bellsouth.net>
  77 *         Reset interrupt 0 timer to 100Hz after suspend
  78 *         Chad Miller <cmiller@surfsouth.com>
  79 *         Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
  80 *         Richard Gooch <rgooch@atnf.csiro.au>
  81 *         Allow boot time disabling of APM
  82 *         Make boot messages far less verbose by default
  83 *         Make asm safer
  84 *         Stephen Rothwell
  85 *    1.8: Add CONFIG_APM_RTC_IS_GMT
  86 *         Richard Gooch <rgooch@atnf.csiro.au>
  87 *         change APM_NOINTS to CONFIG_APM_ALLOW_INTS
  88 *         remove dependency on CONFIG_PROC_FS
  89 *         Stephen Rothwell
  90 *    1.9: Fix small typo.  <laslo@wodip.opole.pl>
  91 *         Try to cope with BIOS's that need to have all display
  92 *         devices blanked and not just the first one.
  93 *         Ross Paterson <ross@soi.city.ac.uk>
  94 *         Fix segment limit setting it has always been wrong as
  95 *         the segments needed to have byte granularity.
  96 *         Mark a few things __init.
  97 *         Add hack to allow power off of SMP systems by popular request.
  98 *         Use CONFIG_SMP instead of __SMP__
  99 *         Ignore BOUNCES for three seconds.
 100 *         Stephen Rothwell
 101 *   1.10: Fix for Thinkpad return code.
 102 *         Merge 2.2 and 2.3 drivers.
 103 *         Remove APM dependencies in arch/i386/kernel/process.c
 104 *         Remove APM dependencies in drivers/char/sysrq.c
 105 *         Reset time across standby.
 106 *         Allow more inititialisation on SMP.
 107 *         Remove CONFIG_APM_POWER_OFF and make it boot time
 108 *         configurable (default on).
 109 *         Make debug only a boot time parameter (remove APM_DEBUG).
 110 *         Try to blank all devices on any error.
 111 *   1.11: Remove APM dependencies in drivers/char/console.c
 112 *         Check nr_running to detect if we are idle (from
 113 *         Borislav Deianov <borislav@lix.polytechnique.fr>)
 114 *         Fix for bioses that don't zero the top part of the
 115 *         entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
 116 *         (reported by Panos Katsaloulis <teras@writeme.com>).
 117 *         Real mode power off patch (Walter Hofmann
 118 *         <Walter.Hofmann@physik.stud.uni-erlangen.de>).
 119 *   1.12: Remove CONFIG_SMP as the compiler will optimize
 120 *         the code away anyway (smp_num_cpus == 1 in UP)
 121 *         noted by Artur Skawina <skawina@geocities.com>.
 122 *         Make power off under SMP work again.
 123 *         Fix thinko with initial engaging of BIOS.
 124 *         Make sure power off only happens on CPU 0
 125 *         (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
 126 *         Do error notification to user mode if BIOS calls fail.
 127 *         Move entrypoint offset fix to ...boot/setup.S
 128 *         where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
 129 *         Remove smp-power-off. SMP users must now specify
 130 *         "apm=power-off" on the kernel command line. Suggested
 131 *         by Jim Avera <jima@hal.com>, modified by Alan Cox
 132 *         <alan@lxorguk.ukuu.org.uk>.
 133 *         Register the /proc/apm entry even on SMP so that
 134 *         scripts that check for it before doing power off
 135 *         work (Jim Avera <jima@hal.com>).
 136 *   1.13: Changes for new pm_ interfaces (Andy Henroid
 137 *         <andy_henroid@yahoo.com>).
 138 *         Modularize the code.
 139 *         Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
 140 *         is now the way life works).
 141 *         Fix thinko in suspend() (wrong return).
 142 *         Notify drivers on critical suspend.
 143 *         Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz>
 144 *         modified by sfr).
 145 *         Disable interrupts while we are suspended (Andy Henroid
 146 *         <andy_henroid@yahoo.com> fixed by sfr).
 147 *         Make power off work on SMP again (Tony Hoyle
 148 *         <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
 149 *         Remove CONFIG_APM_SUSPEND_BOUNCE.  The bounce ignore
 150 *         interval is now configurable.
 151 *   1.14: Make connection version persist across module unload/load.
 152 *         Enable and engage power management earlier.
 153 *         Disengage power management on module unload.
 154 *         Changed to use the sysrq-register hack for registering the
 155 *         power off function called by magic sysrq based upon discussions
 156 *         in irc://irc.openprojects.net/#kernelnewbies
 157 *         (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
 158 *         Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
 159 *         (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
 160 *         Work around byte swap bug in one of the Vaio's BIOS's
 161 *         (Marc Boucher <marc@mbsi.ca>).
 162 *         Exposed the disable flag to dmi so that we can handle known
 163 *         broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>).
 164 *   1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
 165 *         calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>)
 166 *         If an APM idle fails log it and idle sensibly
 167 *   1.15: Don't queue events to clients who open the device O_WRONLY.
 168 *         Don't expect replies from clients who open the device O_RDONLY.
 169 *         (Idea from Thomas Hood)
 170 *         Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
 171 *   1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
 172 *         Notify listeners of standby or suspend events before notifying
 173 *         drivers. Return EBUSY to ioctl() if suspend is rejected.
 174 *         (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
 175 *         Ignore first resume after we generate our own resume event
 176 *         after a suspend (Thomas Hood)
 177 *         Daemonize now gets rid of our controlling terminal (sfr).
 178 *         CONFIG_APM_CPU_IDLE now just affects the default value of
 179 *         idle_threshold (sfr).
 180 *         Change name of kernel apm daemon (as it no longer idles) (sfr).
 181 *   1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
 182 *	   make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
 183 *	   TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
 184 *
 185 * APM 1.1 Reference:
 186 *
 187 *   Intel Corporation, Microsoft Corporation. Advanced Power Management
 188 *   (APM) BIOS Interface Specification, Revision 1.1, September 1993.
 189 *   Intel Order Number 241704-001.  Microsoft Part Number 781-110-X01.
 190 *
 191 * [This document is available free from Intel by calling 800.628.8686 (fax
 192 * 916.356.6100) or 800.548.4725; or from
 193 * http://www.microsoft.com/whdc/archive/amp_12.mspx  It is also
 194 * available from Microsoft by calling 206.882.8080.]
 195 *
 196 * APM 1.2 Reference:
 197 *   Intel Corporation, Microsoft Corporation. Advanced Power Management
 198 *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
 199 *
 200 * [This document is available from Microsoft at:
 201 *    http://www.microsoft.com/whdc/archive/amp_12.mspx]
 202 */
 203
 
 
 204#include <linux/module.h>
 205
 206#include <linux/poll.h>
 207#include <linux/types.h>
 208#include <linux/stddef.h>
 209#include <linux/timer.h>
 210#include <linux/fcntl.h>
 211#include <linux/slab.h>
 212#include <linux/stat.h>
 213#include <linux/proc_fs.h>
 214#include <linux/seq_file.h>
 215#include <linux/miscdevice.h>
 216#include <linux/apm_bios.h>
 217#include <linux/init.h>
 218#include <linux/time.h>
 219#include <linux/sched.h>
 
 220#include <linux/pm.h>
 221#include <linux/capability.h>
 222#include <linux/device.h>
 223#include <linux/kernel.h>
 224#include <linux/freezer.h>
 225#include <linux/smp.h>
 226#include <linux/dmi.h>
 227#include <linux/suspend.h>
 228#include <linux/kthread.h>
 229#include <linux/jiffies.h>
 230#include <linux/acpi.h>
 231#include <linux/syscore_ops.h>
 232#include <linux/i8253.h>
 
 233
 234#include <asm/system.h>
 235#include <asm/uaccess.h>
 236#include <asm/desc.h>
 237#include <asm/olpc.h>
 238#include <asm/paravirt.h>
 239#include <asm/reboot.h>
 
 
 240
 241#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
 242extern int (*console_blank_hook)(int);
 243#endif
 244
 245/*
 246 * The apm_bios device is one of the misc char devices.
 247 * This is its minor number.
 248 */
 249#define	APM_MINOR_DEV	134
 250
 251/*
 252 * See Documentation/Config.help for the configuration options.
 253 *
 254 * Various options can be changed at boot time as follows:
 255 * (We allow underscores for compatibility with the modules code)
 256 *	apm=on/off			enable/disable APM
 257 *	    [no-]allow[-_]ints		allow interrupts during BIOS calls
 258 *	    [no-]broken[-_]psr		BIOS has a broken GetPowerStatus call
 259 *	    [no-]realmode[-_]power[-_]off	switch to real mode before
 260 *	    					powering off
 261 *	    [no-]debug			log some debugging messages
 262 *	    [no-]power[-_]off		power off on shutdown
 263 *	    [no-]smp			Use apm even on an SMP box
 264 *	    bounce[-_]interval=<n>	number of ticks to ignore suspend
 265 *	    				bounces
 266 *          idle[-_]threshold=<n>       System idle percentage above which to
 267 *                                      make APM BIOS idle calls. Set it to
 268 *                                      100 to disable.
 269 *          idle[-_]period=<n>          Period (in 1/100s of a second) over
 270 *                                      which the idle percentage is
 271 *                                      calculated.
 272 */
 273
 274/* KNOWN PROBLEM MACHINES:
 275 *
 276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
 277 *                         [Confirmed by TI representative]
 278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
 279 *                    [Confirmed by BIOS disassembly]
 280 *                    [This may work now ...]
 281 * P: Toshiba 1950S: battery life information only gets updated after resume
 282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
 283 * 	broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
 284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
 285 * 	Neale Banks <neale@lowendale.com.au> December 2000
 286 *
 287 * Legend: U = unusable with APM patches
 288 *         P = partially usable with APM patches
 289 */
 290
 291/*
 292 * Define as 1 to make the driver always call the APM BIOS busy
 293 * routine even if the clock was not reported as slowed by the
 294 * idle routine.  Otherwise, define as 0.
 295 */
 296#define ALWAYS_CALL_BUSY   1
 297
 298/*
 299 * Define to make the APM BIOS calls zero all data segment registers (so
 300 * that an incorrect BIOS implementation will cause a kernel panic if it
 301 * tries to write to arbitrary memory).
 302 */
 303#define APM_ZERO_SEGS
 304
 305#include <asm/apm.h>
 306
 307/*
 308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
 309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
 310 * David Chen <chen@ctpa04.mit.edu>
 311 */
 312#undef INIT_TIMER_AFTER_SUSPEND
 313
 314#ifdef INIT_TIMER_AFTER_SUSPEND
 315#include <linux/timex.h>
 316#include <asm/io.h>
 317#include <linux/delay.h>
 318#endif
 319
 320/*
 321 * Need to poll the APM BIOS every second
 322 */
 323#define APM_CHECK_TIMEOUT	(HZ)
 324
 325/*
 326 * Ignore suspend events for this amount of time after a resume
 327 */
 328#define DEFAULT_BOUNCE_INTERVAL	(3 * HZ)
 329
 330/*
 331 * Maximum number of events stored
 332 */
 333#define APM_MAX_EVENTS		20
 334
 335/*
 336 * The per-file APM data
 337 */
 338struct apm_user {
 339	int		magic;
 340	struct apm_user *next;
 341	unsigned int	suser: 1;
 342	unsigned int	writer: 1;
 343	unsigned int	reader: 1;
 344	unsigned int	suspend_wait: 1;
 345	int		suspend_result;
 346	int		suspends_pending;
 347	int		standbys_pending;
 348	int		suspends_read;
 349	int		standbys_read;
 350	int		event_head;
 351	int		event_tail;
 352	apm_event_t	events[APM_MAX_EVENTS];
 353};
 354
 355/*
 356 * The magic number in apm_user
 357 */
 358#define APM_BIOS_MAGIC		0x4101
 359
 360/*
 361 * idle percentage above which bios idle calls are done
 362 */
 363#ifdef CONFIG_APM_CPU_IDLE
 364#warning deprecated CONFIG_APM_CPU_IDLE will be deleted in 2012
 365#define DEFAULT_IDLE_THRESHOLD	95
 366#else
 367#define DEFAULT_IDLE_THRESHOLD	100
 368#endif
 369#define DEFAULT_IDLE_PERIOD	(100 / 3)
 370
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 371/*
 372 * Local variables
 373 */
 374static struct {
 375	unsigned long	offset;
 376	unsigned short	segment;
 377} apm_bios_entry;
 378static int clock_slowed;
 379static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
 380static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
 381static int set_pm_idle;
 382static int suspends_pending;
 383static int standbys_pending;
 384static int ignore_sys_suspend;
 385static int ignore_normal_resume;
 386static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
 387
 388static int debug __read_mostly;
 389static int smp __read_mostly;
 390static int apm_disabled = -1;
 391#ifdef CONFIG_SMP
 392static int power_off;
 393#else
 394static int power_off = 1;
 395#endif
 396static int realmode_power_off;
 397#ifdef CONFIG_APM_ALLOW_INTS
 398static int allow_ints = 1;
 399#else
 400static int allow_ints;
 401#endif
 402static int broken_psr;
 403
 404static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
 405static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
 406static struct apm_user *user_list;
 407static DEFINE_SPINLOCK(user_list_lock);
 408static DEFINE_MUTEX(apm_mutex);
 409
 410/*
 411 * Set up a segment that references the real mode segment 0x40
 412 * that extends up to the end of page zero (that we have reserved).
 413 * This is for buggy BIOS's that refer to (real mode) segment 0x40
 414 * even though they are called in protected mode.
 415 */
 416static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
 417			(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
 418
 419static const char driver_version[] = "1.16ac";	/* no spaces */
 420
 421static struct task_struct *kapmd_task;
 422
 423/*
 424 *	APM event names taken from the APM 1.2 specification. These are
 425 *	the message codes that the BIOS uses to tell us about events
 426 */
 427static const char * const apm_event_name[] = {
 428	"system standby",
 429	"system suspend",
 430	"normal resume",
 431	"critical resume",
 432	"low battery",
 433	"power status change",
 434	"update time",
 435	"critical suspend",
 436	"user standby",
 437	"user suspend",
 438	"system standby resume",
 439	"capabilities change"
 440};
 441#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
 442
 443typedef struct lookup_t {
 444	int	key;
 445	char 	*msg;
 446} lookup_t;
 447
 448/*
 449 *	The BIOS returns a set of standard error codes in AX when the
 450 *	carry flag is set.
 451 */
 452
 453static const lookup_t error_table[] = {
 454/* N/A	{ APM_SUCCESS,		"Operation succeeded" }, */
 455	{ APM_DISABLED,		"Power management disabled" },
 456	{ APM_CONNECTED,	"Real mode interface already connected" },
 457	{ APM_NOT_CONNECTED,	"Interface not connected" },
 458	{ APM_16_CONNECTED,	"16 bit interface already connected" },
 459/* N/A	{ APM_16_UNSUPPORTED,	"16 bit interface not supported" }, */
 460	{ APM_32_CONNECTED,	"32 bit interface already connected" },
 461	{ APM_32_UNSUPPORTED,	"32 bit interface not supported" },
 462	{ APM_BAD_DEVICE,	"Unrecognized device ID" },
 463	{ APM_BAD_PARAM,	"Parameter out of range" },
 464	{ APM_NOT_ENGAGED,	"Interface not engaged" },
 465	{ APM_BAD_FUNCTION,     "Function not supported" },
 466	{ APM_RESUME_DISABLED,	"Resume timer disabled" },
 467	{ APM_BAD_STATE,	"Unable to enter requested state" },
 468/* N/A	{ APM_NO_EVENTS,	"No events pending" }, */
 469	{ APM_NO_ERROR,		"BIOS did not set a return code" },
 470	{ APM_NOT_PRESENT,	"No APM present" }
 471};
 472#define ERROR_COUNT	ARRAY_SIZE(error_table)
 473
 474/**
 475 *	apm_error	-	display an APM error
 476 *	@str: information string
 477 *	@err: APM BIOS return code
 478 *
 479 *	Write a meaningful log entry to the kernel log in the event of
 480 *	an APM error.  Note that this also handles (negative) kernel errors.
 481 */
 482
 483static void apm_error(char *str, int err)
 484{
 485	int i;
 486
 487	for (i = 0; i < ERROR_COUNT; i++)
 488		if (error_table[i].key == err)
 489			break;
 490	if (i < ERROR_COUNT)
 491		printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
 492	else if (err < 0)
 493		printk(KERN_NOTICE "apm: %s: linux error code %i\n", str, err);
 494	else
 495		printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
 496		       str, err);
 497}
 498
 499/*
 500 * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
 501 * apm_info.allow_ints, we are being really paranoid here!  Not only
 502 * are interrupts disabled, but all the segment registers (except SS)
 503 * are saved and zeroed this means that if the BIOS tries to reference
 504 * any data without explicitly loading the segment registers, the kernel
 505 * will fault immediately rather than have some unforeseen circumstances
 506 * for the rest of the kernel.  And it will be very obvious!  :-) Doing
 507 * this depends on CS referring to the same physical memory as DS so that
 508 * DS can be zeroed before the call. Unfortunately, we can't do anything
 509 * about the stack segment/pointer.  Also, we tell the compiler that
 510 * everything could change.
 511 *
 512 * Also, we KNOW that for the non error case of apm_bios_call, there
 513 * is no useful data returned in the low order 8 bits of eax.
 514 */
 515
 516static inline unsigned long __apm_irq_save(void)
 517{
 518	unsigned long flags;
 519	local_save_flags(flags);
 520	if (apm_info.allow_ints) {
 521		if (irqs_disabled_flags(flags))
 522			local_irq_enable();
 523	} else
 524		local_irq_disable();
 525
 526	return flags;
 527}
 528
 529#define apm_irq_save(flags) \
 530	do { flags = __apm_irq_save(); } while (0)
 531
 532static inline void apm_irq_restore(unsigned long flags)
 533{
 534	if (irqs_disabled_flags(flags))
 535		local_irq_disable();
 536	else if (irqs_disabled())
 537		local_irq_enable();
 538}
 539
 540#ifdef APM_ZERO_SEGS
 541#	define APM_DECL_SEGS \
 542		unsigned int saved_fs; unsigned int saved_gs;
 543#	define APM_DO_SAVE_SEGS \
 544		savesegment(fs, saved_fs); savesegment(gs, saved_gs)
 545#	define APM_DO_RESTORE_SEGS \
 546		loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
 547#else
 548#	define APM_DECL_SEGS
 549#	define APM_DO_SAVE_SEGS
 550#	define APM_DO_RESTORE_SEGS
 551#endif
 552
 553struct apm_bios_call {
 554	u32 func;
 555	/* In and out */
 556	u32 ebx;
 557	u32 ecx;
 558	/* Out only */
 559	u32 eax;
 560	u32 edx;
 561	u32 esi;
 562
 563	/* Error: -ENOMEM, or bits 8-15 of eax */
 564	int err;
 565};
 566
 567/**
 568 *	__apm_bios_call - Make an APM BIOS 32bit call
 569 *	@_call: pointer to struct apm_bios_call.
 570 *
 571 *	Make an APM call using the 32bit protected mode interface. The
 572 *	caller is responsible for knowing if APM BIOS is configured and
 573 *	enabled. This call can disable interrupts for a long period of
 574 *	time on some laptops.  The return value is in AH and the carry
 575 *	flag is loaded into AL.  If there is an error, then the error
 576 *	code is returned in AH (bits 8-15 of eax) and this function
 577 *	returns non-zero.
 578 *
 579 *	Note: this makes the call on the current CPU.
 580 */
 581static long __apm_bios_call(void *_call)
 582{
 583	APM_DECL_SEGS
 584	unsigned long		flags;
 585	int			cpu;
 586	struct desc_struct	save_desc_40;
 587	struct desc_struct	*gdt;
 588	struct apm_bios_call	*call = _call;
 
 589
 590	cpu = get_cpu();
 591	BUG_ON(cpu != 0);
 592	gdt = get_cpu_gdt_table(cpu);
 593	save_desc_40 = gdt[0x40 / 8];
 594	gdt[0x40 / 8] = bad_bios_desc;
 595
 596	apm_irq_save(flags);
 
 
 597	APM_DO_SAVE_SEGS;
 598	apm_bios_call_asm(call->func, call->ebx, call->ecx,
 599			  &call->eax, &call->ebx, &call->ecx, &call->edx,
 600			  &call->esi);
 601	APM_DO_RESTORE_SEGS;
 
 
 602	apm_irq_restore(flags);
 603	gdt[0x40 / 8] = save_desc_40;
 604	put_cpu();
 605
 606	return call->eax & 0xff;
 607}
 608
 609/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */
 610static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call)
 611{
 612	int ret;
 613
 614	/* Don't bother with work_on_cpu in the common case, so we don't
 615	 * have to worry about OOM or overhead. */
 616	if (get_cpu() == 0) {
 617		ret = fn(call);
 618		put_cpu();
 619	} else {
 620		put_cpu();
 621		ret = work_on_cpu(0, fn, call);
 622	}
 623
 624	/* work_on_cpu can fail with -ENOMEM */
 625	if (ret < 0)
 626		call->err = ret;
 627	else
 628		call->err = (call->eax >> 8) & 0xff;
 629
 630	return ret;
 631}
 632
 633/**
 634 *	apm_bios_call	-	Make an APM BIOS 32bit call (on CPU 0)
 635 *	@call: the apm_bios_call registers.
 636 *
 637 *	If there is an error, it is returned in @call.err.
 638 */
 639static int apm_bios_call(struct apm_bios_call *call)
 640{
 641	return on_cpu0(__apm_bios_call, call);
 642}
 643
 644/**
 645 *	__apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0)
 646 *	@_call: pointer to struct apm_bios_call.
 647 *
 648 *	Make a BIOS call that returns one value only, or just status.
 649 *	If there is an error, then the error code is returned in AH
 650 *	(bits 8-15 of eax) and this function returns non-zero (it can
 651 *	also return -ENOMEM). This is used for simpler BIOS operations.
 652 *	This call may hold interrupts off for a long time on some laptops.
 653 *
 654 *	Note: this makes the call on the current CPU.
 655 */
 656static long __apm_bios_call_simple(void *_call)
 657{
 658	u8			error;
 659	APM_DECL_SEGS
 660	unsigned long		flags;
 661	int			cpu;
 662	struct desc_struct	save_desc_40;
 663	struct desc_struct	*gdt;
 664	struct apm_bios_call	*call = _call;
 
 665
 666	cpu = get_cpu();
 667	BUG_ON(cpu != 0);
 668	gdt = get_cpu_gdt_table(cpu);
 669	save_desc_40 = gdt[0x40 / 8];
 670	gdt[0x40 / 8] = bad_bios_desc;
 671
 672	apm_irq_save(flags);
 
 
 673	APM_DO_SAVE_SEGS;
 674	error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx,
 675					 &call->eax);
 676	APM_DO_RESTORE_SEGS;
 
 
 677	apm_irq_restore(flags);
 678	gdt[0x40 / 8] = save_desc_40;
 679	put_cpu();
 680	return error;
 681}
 682
 683/**
 684 *	apm_bios_call_simple	-	make a simple APM BIOS 32bit call
 685 *	@func: APM function to invoke
 686 *	@ebx_in: EBX register value for BIOS call
 687 *	@ecx_in: ECX register value for BIOS call
 688 *	@eax: EAX register on return from the BIOS call
 689 *	@err: bits
 690 *
 691 *	Make a BIOS call that returns one value only, or just status.
 692 *	If there is an error, then the error code is returned in @err
 693 *	and this function returns non-zero. This is used for simpler
 694 *	BIOS operations.  This call may hold interrupts off for a long
 695 *	time on some laptops.
 696 */
 697static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax,
 698				int *err)
 699{
 700	struct apm_bios_call call;
 701	int ret;
 702
 703	call.func = func;
 704	call.ebx = ebx_in;
 705	call.ecx = ecx_in;
 706
 707	ret = on_cpu0(__apm_bios_call_simple, &call);
 708	*eax = call.eax;
 709	*err = call.err;
 710	return ret;
 711}
 712
 713/**
 714 *	apm_driver_version	-	APM driver version
 715 *	@val:	loaded with the APM version on return
 716 *
 717 *	Retrieve the APM version supported by the BIOS. This is only
 718 *	supported for APM 1.1 or higher. An error indicates APM 1.0 is
 719 *	probably present.
 720 *
 721 *	On entry val should point to a value indicating the APM driver
 722 *	version with the high byte being the major and the low byte the
 723 *	minor number both in BCD
 724 *
 725 *	On return it will hold the BIOS revision supported in the
 726 *	same format.
 727 */
 728
 729static int apm_driver_version(u_short *val)
 730{
 731	u32 eax;
 732	int err;
 733
 734	if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err))
 735		return err;
 736	*val = eax;
 737	return APM_SUCCESS;
 738}
 739
 740/**
 741 *	apm_get_event	-	get an APM event from the BIOS
 742 *	@event: pointer to the event
 743 *	@info: point to the event information
 744 *
 745 *	The APM BIOS provides a polled information for event
 746 *	reporting. The BIOS expects to be polled at least every second
 747 *	when events are pending. When a message is found the caller should
 748 *	poll until no more messages are present.  However, this causes
 749 *	problems on some laptops where a suspend event notification is
 750 *	not cleared until it is acknowledged.
 751 *
 752 *	Additional information is returned in the info pointer, providing
 753 *	that APM 1.2 is in use. If no messges are pending the value 0x80
 754 *	is returned (No power management events pending).
 755 */
 756static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
 757{
 758	struct apm_bios_call call;
 759
 760	call.func = APM_FUNC_GET_EVENT;
 761	call.ebx = call.ecx = 0;
 762
 763	if (apm_bios_call(&call))
 764		return call.err;
 765
 766	*event = call.ebx;
 767	if (apm_info.connection_version < 0x0102)
 768		*info = ~0; /* indicate info not valid */
 769	else
 770		*info = call.ecx;
 771	return APM_SUCCESS;
 772}
 773
 774/**
 775 *	set_power_state	-	set the power management state
 776 *	@what: which items to transition
 777 *	@state: state to transition to
 778 *
 779 *	Request an APM change of state for one or more system devices. The
 780 *	processor state must be transitioned last of all. what holds the
 781 *	class of device in the upper byte and the device number (0xFF for
 782 *	all) for the object to be transitioned.
 783 *
 784 *	The state holds the state to transition to, which may in fact
 785 *	be an acceptance of a BIOS requested state change.
 786 */
 787
 788static int set_power_state(u_short what, u_short state)
 789{
 790	u32 eax;
 791	int err;
 792
 793	if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err))
 794		return err;
 795	return APM_SUCCESS;
 796}
 797
 798/**
 799 *	set_system_power_state - set system wide power state
 800 *	@state: which state to enter
 801 *
 802 *	Transition the entire system into a new APM power state.
 803 */
 804
 805static int set_system_power_state(u_short state)
 806{
 807	return set_power_state(APM_DEVICE_ALL, state);
 808}
 809
 810/**
 811 *	apm_do_idle	-	perform power saving
 812 *
 813 *	This function notifies the BIOS that the processor is (in the view
 814 *	of the OS) idle. It returns -1 in the event that the BIOS refuses
 815 *	to handle the idle request. On a success the function returns 1
 816 *	if the BIOS did clock slowing or 0 otherwise.
 817 */
 818
 819static int apm_do_idle(void)
 820{
 821	u32 eax;
 822	u8 ret = 0;
 823	int idled = 0;
 824	int polling;
 825	int err = 0;
 826
 827	polling = !!(current_thread_info()->status & TS_POLLING);
 828	if (polling) {
 829		current_thread_info()->status &= ~TS_POLLING;
 830		/*
 831		 * TS_POLLING-cleared state must be visible before we
 832		 * test NEED_RESCHED:
 833		 */
 834		smp_mb();
 835	}
 836	if (!need_resched()) {
 837		idled = 1;
 838		ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
 839	}
 840	if (polling)
 841		current_thread_info()->status |= TS_POLLING;
 842
 843	if (!idled)
 844		return 0;
 845
 846	if (ret) {
 847		static unsigned long t;
 848
 849		/* This always fails on some SMP boards running UP kernels.
 850		 * Only report the failure the first 5 times.
 851		 */
 852		if (++t < 5) {
 853			printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
 854			t = jiffies;
 855		}
 856		return -1;
 857	}
 858	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
 859	return clock_slowed;
 860}
 861
 862/**
 863 *	apm_do_busy	-	inform the BIOS the CPU is busy
 864 *
 865 *	Request that the BIOS brings the CPU back to full performance.
 866 */
 867
 868static void apm_do_busy(void)
 869{
 870	u32 dummy;
 871	int err;
 872
 873	if (clock_slowed || ALWAYS_CALL_BUSY) {
 874		(void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
 875		clock_slowed = 0;
 876	}
 877}
 878
 879/*
 880 * If no process has really been interested in
 881 * the CPU for some time, we want to call BIOS
 882 * power management - we probably want
 883 * to conserve power.
 884 */
 885#define IDLE_CALC_LIMIT	(HZ * 100)
 886#define IDLE_LEAKY_MAX	16
 887
 888static void (*original_pm_idle)(void) __read_mostly;
 889
 890/**
 891 * apm_cpu_idle		-	cpu idling for APM capable Linux
 892 *
 893 * This is the idling function the kernel executes when APM is available. It
 894 * tries to do BIOS powermanagement based on the average system idle time.
 895 * Furthermore it calls the system default idle routine.
 896 */
 897
 898static void apm_cpu_idle(void)
 
 899{
 900	static int use_apm_idle; /* = 0 */
 901	static unsigned int last_jiffies; /* = 0 */
 902	static unsigned int last_stime; /* = 0 */
 
 903
 904	int apm_idle_done = 0;
 905	unsigned int jiffies_since_last_check = jiffies - last_jiffies;
 906	unsigned int bucket;
 907
 908	WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2012");
 909recalc:
 
 910	if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
 911		use_apm_idle = 0;
 912		last_jiffies = jiffies;
 913		last_stime = current->stime;
 914	} else if (jiffies_since_last_check > idle_period) {
 915		unsigned int idle_percentage;
 916
 917		idle_percentage = current->stime - last_stime;
 918		idle_percentage *= 100;
 919		idle_percentage /= jiffies_since_last_check;
 920		use_apm_idle = (idle_percentage > idle_threshold);
 921		if (apm_info.forbid_idle)
 922			use_apm_idle = 0;
 923		last_jiffies = jiffies;
 924		last_stime = current->stime;
 925	}
 926
 
 
 
 927	bucket = IDLE_LEAKY_MAX;
 928
 929	while (!need_resched()) {
 930		if (use_apm_idle) {
 931			unsigned int t;
 932
 933			t = jiffies;
 934			switch (apm_do_idle()) {
 935			case 0:
 936				apm_idle_done = 1;
 937				if (t != jiffies) {
 938					if (bucket) {
 939						bucket = IDLE_LEAKY_MAX;
 940						continue;
 941					}
 942				} else if (bucket) {
 943					bucket--;
 944					continue;
 945				}
 946				break;
 947			case 1:
 948				apm_idle_done = 1;
 949				break;
 950			default: /* BIOS refused */
 951				break;
 952			}
 953		}
 954		if (original_pm_idle)
 955			original_pm_idle();
 956		else
 957			default_idle();
 958		local_irq_disable();
 959		jiffies_since_last_check = jiffies - last_jiffies;
 960		if (jiffies_since_last_check > idle_period)
 961			goto recalc;
 962	}
 963
 964	if (apm_idle_done)
 965		apm_do_busy();
 966
 967	local_irq_enable();
 968}
 969
 970/**
 971 *	apm_power_off	-	ask the BIOS to power off
 972 *
 973 *	Handle the power off sequence. This is the one piece of code we
 974 *	will execute even on SMP machines. In order to deal with BIOS
 975 *	bugs we support real mode APM BIOS power off calls. We also make
 976 *	the SMP call on CPU0 as some systems will only honour this call
 977 *	on their first cpu.
 978 */
 979
 980static void apm_power_off(void)
 981{
 982	/* Some bioses don't like being called from CPU != 0 */
 983	if (apm_info.realmode_power_off) {
 984		set_cpus_allowed_ptr(current, cpumask_of(0));
 985		machine_real_restart(MRR_APM);
 986	} else {
 987		(void)set_system_power_state(APM_STATE_OFF);
 988	}
 989}
 990
 991#ifdef CONFIG_APM_DO_ENABLE
 992
 993/**
 994 *	apm_enable_power_management - enable BIOS APM power management
 995 *	@enable: enable yes/no
 996 *
 997 *	Enable or disable the APM BIOS power services.
 998 */
 999
1000static int apm_enable_power_management(int enable)
1001{
1002	u32 eax;
1003	int err;
1004
1005	if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
1006		return APM_NOT_ENGAGED;
1007	if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
1008				 enable, &eax, &err))
1009		return err;
1010	if (enable)
1011		apm_info.bios.flags &= ~APM_BIOS_DISABLED;
1012	else
1013		apm_info.bios.flags |= APM_BIOS_DISABLED;
1014	return APM_SUCCESS;
1015}
1016#endif
1017
1018/**
1019 *	apm_get_power_status	-	get current power state
1020 *	@status: returned status
1021 *	@bat: battery info
1022 *	@life: estimated life
1023 *
1024 *	Obtain the current power status from the APM BIOS. We return a
1025 *	status which gives the rough battery status, and current power
1026 *	source. The bat value returned give an estimate as a percentage
1027 *	of life and a status value for the battery. The estimated life
1028 *	if reported is a lifetime in secodnds/minutes at current powwer
1029 *	consumption.
1030 */
1031
1032static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
1033{
1034	struct apm_bios_call call;
1035
1036	call.func = APM_FUNC_GET_STATUS;
1037	call.ebx = APM_DEVICE_ALL;
1038	call.ecx = 0;
1039
1040	if (apm_info.get_power_status_broken)
1041		return APM_32_UNSUPPORTED;
1042	if (apm_bios_call(&call))
 
 
1043		return call.err;
 
1044	*status = call.ebx;
1045	*bat = call.ecx;
1046	if (apm_info.get_power_status_swabinminutes) {
1047		*life = swab16((u16)call.edx);
1048		*life |= 0x8000;
1049	} else
1050		*life = call.edx;
1051	return APM_SUCCESS;
1052}
1053
1054#if 0
1055static int apm_get_battery_status(u_short which, u_short *status,
1056				  u_short *bat, u_short *life, u_short *nbat)
1057{
1058	u32 eax;
1059	u32 ebx;
1060	u32 ecx;
1061	u32 edx;
1062	u32 esi;
1063
1064	if (apm_info.connection_version < 0x0102) {
1065		/* pretend we only have one battery. */
1066		if (which != 1)
1067			return APM_BAD_DEVICE;
1068		*nbat = 1;
1069		return apm_get_power_status(status, bat, life);
1070	}
1071
1072	if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
1073			  &ebx, &ecx, &edx, &esi))
1074		return (eax >> 8) & 0xff;
1075	*status = ebx;
1076	*bat = ecx;
1077	*life = edx;
1078	*nbat = esi;
1079	return APM_SUCCESS;
1080}
1081#endif
1082
1083/**
1084 *	apm_engage_power_management	-	enable PM on a device
1085 *	@device: identity of device
1086 *	@enable: on/off
1087 *
1088 *	Activate or deactive power management on either a specific device
1089 *	or the entire system (%APM_DEVICE_ALL).
1090 */
1091
1092static int apm_engage_power_management(u_short device, int enable)
1093{
1094	u32 eax;
1095	int err;
1096
1097	if ((enable == 0) && (device == APM_DEVICE_ALL)
1098	    && (apm_info.bios.flags & APM_BIOS_DISABLED))
1099		return APM_DISABLED;
1100	if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable,
1101				 &eax, &err))
1102		return err;
1103	if (device == APM_DEVICE_ALL) {
1104		if (enable)
1105			apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
1106		else
1107			apm_info.bios.flags |= APM_BIOS_DISENGAGED;
1108	}
1109	return APM_SUCCESS;
1110}
1111
1112#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1113
1114/**
1115 *	apm_console_blank	-	blank the display
1116 *	@blank: on/off
1117 *
1118 *	Attempt to blank the console, firstly by blanking just video device
1119 *	zero, and if that fails (some BIOSes don't support it) then it blanks
1120 *	all video devices. Typically the BIOS will do laptop backlight and
1121 *	monitor powerdown for us.
1122 */
1123
1124static int apm_console_blank(int blank)
1125{
1126	int error = APM_NOT_ENGAGED; /* silence gcc */
1127	int i;
1128	u_short state;
1129	static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
1130
1131	state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
1132
1133	for (i = 0; i < ARRAY_SIZE(dev); i++) {
1134		error = set_power_state(dev[i], state);
1135
1136		if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
1137			return 1;
1138
1139		if (error == APM_NOT_ENGAGED)
1140			break;
1141	}
1142
1143	if (error == APM_NOT_ENGAGED) {
1144		static int tried;
1145		int eng_error;
1146		if (tried++ == 0) {
1147			eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1148			if (eng_error) {
1149				apm_error("set display", error);
1150				apm_error("engage interface", eng_error);
1151				return 0;
1152			} else
1153				return apm_console_blank(blank);
1154		}
1155	}
1156	apm_error("set display", error);
1157	return 0;
1158}
1159#endif
1160
1161static int queue_empty(struct apm_user *as)
1162{
1163	return as->event_head == as->event_tail;
1164}
1165
1166static apm_event_t get_queued_event(struct apm_user *as)
1167{
1168	if (++as->event_tail >= APM_MAX_EVENTS)
1169		as->event_tail = 0;
1170	return as->events[as->event_tail];
1171}
1172
1173static void queue_event(apm_event_t event, struct apm_user *sender)
1174{
1175	struct apm_user *as;
1176
1177	spin_lock(&user_list_lock);
1178	if (user_list == NULL)
1179		goto out;
1180	for (as = user_list; as != NULL; as = as->next) {
1181		if ((as == sender) || (!as->reader))
1182			continue;
1183		if (++as->event_head >= APM_MAX_EVENTS)
1184			as->event_head = 0;
1185
1186		if (as->event_head == as->event_tail) {
1187			static int notified;
1188
1189			if (notified++ == 0)
1190			    printk(KERN_ERR "apm: an event queue overflowed\n");
1191			if (++as->event_tail >= APM_MAX_EVENTS)
1192				as->event_tail = 0;
1193		}
1194		as->events[as->event_head] = event;
1195		if (!as->suser || !as->writer)
1196			continue;
1197		switch (event) {
1198		case APM_SYS_SUSPEND:
1199		case APM_USER_SUSPEND:
1200			as->suspends_pending++;
1201			suspends_pending++;
1202			break;
1203
1204		case APM_SYS_STANDBY:
1205		case APM_USER_STANDBY:
1206			as->standbys_pending++;
1207			standbys_pending++;
1208			break;
1209		}
1210	}
1211	wake_up_interruptible(&apm_waitqueue);
1212out:
1213	spin_unlock(&user_list_lock);
1214}
1215
1216static void reinit_timer(void)
1217{
1218#ifdef INIT_TIMER_AFTER_SUSPEND
1219	unsigned long flags;
1220
1221	raw_spin_lock_irqsave(&i8253_lock, flags);
1222	/* set the clock to HZ */
1223	outb_p(0x34, PIT_MODE);		/* binary, mode 2, LSB/MSB, ch 0 */
1224	udelay(10);
1225	outb_p(LATCH & 0xff, PIT_CH0);	/* LSB */
1226	udelay(10);
1227	outb_p(LATCH >> 8, PIT_CH0);	/* MSB */
1228	udelay(10);
1229	raw_spin_unlock_irqrestore(&i8253_lock, flags);
1230#endif
1231}
1232
1233static int suspend(int vetoable)
1234{
1235	int err;
1236	struct apm_user	*as;
1237
1238	dpm_suspend_start(PMSG_SUSPEND);
1239
1240	dpm_suspend_noirq(PMSG_SUSPEND);
1241
1242	local_irq_disable();
1243	syscore_suspend();
1244
1245	local_irq_enable();
1246
1247	save_processor_state();
1248	err = set_system_power_state(APM_STATE_SUSPEND);
1249	ignore_normal_resume = 1;
1250	restore_processor_state();
1251
1252	local_irq_disable();
1253	reinit_timer();
1254
1255	if (err == APM_NO_ERROR)
1256		err = APM_SUCCESS;
1257	if (err != APM_SUCCESS)
1258		apm_error("suspend", err);
1259	err = (err == APM_SUCCESS) ? 0 : -EIO;
1260
1261	syscore_resume();
1262	local_irq_enable();
1263
1264	dpm_resume_noirq(PMSG_RESUME);
 
1265
1266	dpm_resume_end(PMSG_RESUME);
1267	queue_event(APM_NORMAL_RESUME, NULL);
1268	spin_lock(&user_list_lock);
1269	for (as = user_list; as != NULL; as = as->next) {
1270		as->suspend_wait = 0;
1271		as->suspend_result = err;
1272	}
1273	spin_unlock(&user_list_lock);
1274	wake_up_interruptible(&apm_suspend_waitqueue);
1275	return err;
1276}
1277
1278static void standby(void)
1279{
1280	int err;
1281
1282	dpm_suspend_noirq(PMSG_SUSPEND);
1283
1284	local_irq_disable();
1285	syscore_suspend();
1286	local_irq_enable();
1287
1288	err = set_system_power_state(APM_STATE_STANDBY);
1289	if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
1290		apm_error("standby", err);
1291
1292	local_irq_disable();
1293	syscore_resume();
1294	local_irq_enable();
1295
1296	dpm_resume_noirq(PMSG_RESUME);
1297}
1298
1299static apm_event_t get_event(void)
1300{
1301	int error;
1302	apm_event_t event = APM_NO_EVENTS; /* silence gcc */
1303	apm_eventinfo_t	info;
1304
1305	static int notified;
1306
1307	/* we don't use the eventinfo */
1308	error = apm_get_event(&event, &info);
1309	if (error == APM_SUCCESS)
1310		return event;
1311
1312	if ((error != APM_NO_EVENTS) && (notified++ == 0))
1313		apm_error("get_event", error);
1314
1315	return 0;
1316}
1317
1318static void check_events(void)
1319{
1320	apm_event_t event;
1321	static unsigned long last_resume;
1322	static int ignore_bounce;
1323
1324	while ((event = get_event()) != 0) {
1325		if (debug) {
1326			if (event <= NR_APM_EVENT_NAME)
1327				printk(KERN_DEBUG "apm: received %s notify\n",
1328				       apm_event_name[event - 1]);
1329			else
1330				printk(KERN_DEBUG "apm: received unknown "
1331				       "event 0x%02x\n", event);
1332		}
1333		if (ignore_bounce
1334		    && (time_after(jiffies, last_resume + bounce_interval)))
1335			ignore_bounce = 0;
1336
1337		switch (event) {
1338		case APM_SYS_STANDBY:
1339		case APM_USER_STANDBY:
1340			queue_event(event, NULL);
1341			if (standbys_pending <= 0)
1342				standby();
1343			break;
1344
1345		case APM_USER_SUSPEND:
1346#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
1347			if (apm_info.connection_version > 0x100)
1348				set_system_power_state(APM_STATE_REJECT);
1349			break;
1350#endif
1351		case APM_SYS_SUSPEND:
1352			if (ignore_bounce) {
1353				if (apm_info.connection_version > 0x100)
1354					set_system_power_state(APM_STATE_REJECT);
1355				break;
1356			}
1357			/*
1358			 * If we are already processing a SUSPEND,
1359			 * then further SUSPEND events from the BIOS
1360			 * will be ignored.  We also return here to
1361			 * cope with the fact that the Thinkpads keep
1362			 * sending a SUSPEND event until something else
1363			 * happens!
1364			 */
1365			if (ignore_sys_suspend)
1366				return;
1367			ignore_sys_suspend = 1;
1368			queue_event(event, NULL);
1369			if (suspends_pending <= 0)
1370				(void) suspend(1);
1371			break;
1372
1373		case APM_NORMAL_RESUME:
1374		case APM_CRITICAL_RESUME:
1375		case APM_STANDBY_RESUME:
1376			ignore_sys_suspend = 0;
1377			last_resume = jiffies;
1378			ignore_bounce = 1;
1379			if ((event != APM_NORMAL_RESUME)
1380			    || (ignore_normal_resume == 0)) {
1381				dpm_resume_end(PMSG_RESUME);
1382				queue_event(event, NULL);
1383			}
1384			ignore_normal_resume = 0;
1385			break;
1386
1387		case APM_CAPABILITY_CHANGE:
1388		case APM_LOW_BATTERY:
1389		case APM_POWER_STATUS_CHANGE:
1390			queue_event(event, NULL);
1391			/* If needed, notify drivers here */
1392			break;
1393
1394		case APM_UPDATE_TIME:
1395			break;
1396
1397		case APM_CRITICAL_SUSPEND:
1398			/*
1399			 * We are not allowed to reject a critical suspend.
1400			 */
1401			(void)suspend(0);
1402			break;
1403		}
1404	}
1405}
1406
1407static void apm_event_handler(void)
1408{
1409	static int pending_count = 4;
1410	int err;
1411
1412	if ((standbys_pending > 0) || (suspends_pending > 0)) {
1413		if ((apm_info.connection_version > 0x100) &&
1414		    (pending_count-- <= 0)) {
1415			pending_count = 4;
1416			if (debug)
1417				printk(KERN_DEBUG "apm: setting state busy\n");
1418			err = set_system_power_state(APM_STATE_BUSY);
1419			if (err)
1420				apm_error("busy", err);
1421		}
1422	} else
1423		pending_count = 4;
1424	check_events();
1425}
1426
1427/*
1428 * This is the APM thread main loop.
1429 */
1430
1431static void apm_mainloop(void)
1432{
1433	DECLARE_WAITQUEUE(wait, current);
1434
1435	add_wait_queue(&apm_waitqueue, &wait);
1436	set_current_state(TASK_INTERRUPTIBLE);
1437	for (;;) {
1438		schedule_timeout(APM_CHECK_TIMEOUT);
1439		if (kthread_should_stop())
1440			break;
1441		/*
1442		 * Ok, check all events, check for idle (and mark us sleeping
1443		 * so as not to count towards the load average)..
1444		 */
1445		set_current_state(TASK_INTERRUPTIBLE);
1446		apm_event_handler();
1447	}
1448	remove_wait_queue(&apm_waitqueue, &wait);
1449}
1450
1451static int check_apm_user(struct apm_user *as, const char *func)
1452{
1453	if (as == NULL || as->magic != APM_BIOS_MAGIC) {
1454		printk(KERN_ERR "apm: %s passed bad filp\n", func);
1455		return 1;
1456	}
1457	return 0;
1458}
1459
1460static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
1461{
1462	struct apm_user *as;
1463	int i;
1464	apm_event_t event;
1465
1466	as = fp->private_data;
1467	if (check_apm_user(as, "read"))
1468		return -EIO;
1469	if ((int)count < sizeof(apm_event_t))
1470		return -EINVAL;
1471	if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
1472		return -EAGAIN;
1473	wait_event_interruptible(apm_waitqueue, !queue_empty(as));
1474	i = count;
1475	while ((i >= sizeof(event)) && !queue_empty(as)) {
1476		event = get_queued_event(as);
1477		if (copy_to_user(buf, &event, sizeof(event))) {
1478			if (i < count)
1479				break;
1480			return -EFAULT;
1481		}
1482		switch (event) {
1483		case APM_SYS_SUSPEND:
1484		case APM_USER_SUSPEND:
1485			as->suspends_read++;
1486			break;
1487
1488		case APM_SYS_STANDBY:
1489		case APM_USER_STANDBY:
1490			as->standbys_read++;
1491			break;
1492		}
1493		buf += sizeof(event);
1494		i -= sizeof(event);
1495	}
1496	if (i < count)
1497		return count - i;
1498	if (signal_pending(current))
1499		return -ERESTARTSYS;
1500	return 0;
1501}
1502
1503static unsigned int do_poll(struct file *fp, poll_table *wait)
1504{
1505	struct apm_user *as;
1506
1507	as = fp->private_data;
1508	if (check_apm_user(as, "poll"))
1509		return 0;
1510	poll_wait(fp, &apm_waitqueue, wait);
1511	if (!queue_empty(as))
1512		return POLLIN | POLLRDNORM;
1513	return 0;
1514}
1515
1516static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
1517{
1518	struct apm_user *as;
1519	int ret;
1520
1521	as = filp->private_data;
1522	if (check_apm_user(as, "ioctl"))
1523		return -EIO;
1524	if (!as->suser || !as->writer)
1525		return -EPERM;
1526	switch (cmd) {
1527	case APM_IOC_STANDBY:
1528		mutex_lock(&apm_mutex);
1529		if (as->standbys_read > 0) {
1530			as->standbys_read--;
1531			as->standbys_pending--;
1532			standbys_pending--;
1533		} else
1534			queue_event(APM_USER_STANDBY, as);
1535		if (standbys_pending <= 0)
1536			standby();
1537		mutex_unlock(&apm_mutex);
1538		break;
1539	case APM_IOC_SUSPEND:
1540		mutex_lock(&apm_mutex);
1541		if (as->suspends_read > 0) {
1542			as->suspends_read--;
1543			as->suspends_pending--;
1544			suspends_pending--;
1545		} else
1546			queue_event(APM_USER_SUSPEND, as);
1547		if (suspends_pending <= 0) {
1548			ret = suspend(1);
1549			mutex_unlock(&apm_mutex);
1550		} else {
1551			as->suspend_wait = 1;
1552			mutex_unlock(&apm_mutex);
1553			wait_event_interruptible(apm_suspend_waitqueue,
1554					as->suspend_wait == 0);
1555			ret = as->suspend_result;
1556		}
1557		return ret;
1558	default:
1559		return -ENOTTY;
1560	}
1561	return 0;
1562}
1563
1564static int do_release(struct inode *inode, struct file *filp)
1565{
1566	struct apm_user *as;
1567
1568	as = filp->private_data;
1569	if (check_apm_user(as, "release"))
1570		return 0;
1571	filp->private_data = NULL;
1572	if (as->standbys_pending > 0) {
1573		standbys_pending -= as->standbys_pending;
1574		if (standbys_pending <= 0)
1575			standby();
1576	}
1577	if (as->suspends_pending > 0) {
1578		suspends_pending -= as->suspends_pending;
1579		if (suspends_pending <= 0)
1580			(void) suspend(1);
1581	}
1582	spin_lock(&user_list_lock);
1583	if (user_list == as)
1584		user_list = as->next;
1585	else {
1586		struct apm_user *as1;
1587
1588		for (as1 = user_list;
1589		     (as1 != NULL) && (as1->next != as);
1590		     as1 = as1->next)
1591			;
1592		if (as1 == NULL)
1593			printk(KERN_ERR "apm: filp not in user list\n");
1594		else
1595			as1->next = as->next;
1596	}
1597	spin_unlock(&user_list_lock);
1598	kfree(as);
1599	return 0;
1600}
1601
1602static int do_open(struct inode *inode, struct file *filp)
1603{
1604	struct apm_user *as;
1605
1606	as = kmalloc(sizeof(*as), GFP_KERNEL);
1607	if (as == NULL) {
1608		printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
1609		       sizeof(*as));
1610		return -ENOMEM;
1611	}
1612	as->magic = APM_BIOS_MAGIC;
1613	as->event_tail = as->event_head = 0;
1614	as->suspends_pending = as->standbys_pending = 0;
1615	as->suspends_read = as->standbys_read = 0;
1616	/*
1617	 * XXX - this is a tiny bit broken, when we consider BSD
1618	 * process accounting. If the device is opened by root, we
1619	 * instantly flag that we used superuser privs. Who knows,
1620	 * we might close the device immediately without doing a
1621	 * privileged operation -- cevans
1622	 */
1623	as->suser = capable(CAP_SYS_ADMIN);
1624	as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
1625	as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
1626	spin_lock(&user_list_lock);
1627	as->next = user_list;
1628	user_list = as;
1629	spin_unlock(&user_list_lock);
1630	filp->private_data = as;
1631	return 0;
1632}
1633
 
1634static int proc_apm_show(struct seq_file *m, void *v)
1635{
1636	unsigned short	bx;
1637	unsigned short	cx;
1638	unsigned short	dx;
1639	int		error;
1640	unsigned short  ac_line_status = 0xff;
1641	unsigned short  battery_status = 0xff;
1642	unsigned short  battery_flag   = 0xff;
1643	int		percentage     = -1;
1644	int             time_units     = -1;
1645	char            *units         = "?";
1646
1647	if ((num_online_cpus() == 1) &&
1648	    !(error = apm_get_power_status(&bx, &cx, &dx))) {
1649		ac_line_status = (bx >> 8) & 0xff;
1650		battery_status = bx & 0xff;
1651		if ((cx & 0xff) != 0xff)
1652			percentage = cx & 0xff;
1653
1654		if (apm_info.connection_version > 0x100) {
1655			battery_flag = (cx >> 8) & 0xff;
1656			if (dx != 0xffff) {
1657				units = (dx & 0x8000) ? "min" : "sec";
1658				time_units = dx & 0x7fff;
1659			}
1660		}
1661	}
1662	/* Arguments, with symbols from linux/apm_bios.h.  Information is
1663	   from the Get Power Status (0x0a) call unless otherwise noted.
1664
1665	   0) Linux driver version (this will change if format changes)
1666	   1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
1667	   2) APM flags from APM Installation Check (0x00):
1668	      bit 0: APM_16_BIT_SUPPORT
1669	      bit 1: APM_32_BIT_SUPPORT
1670	      bit 2: APM_IDLE_SLOWS_CLOCK
1671	      bit 3: APM_BIOS_DISABLED
1672	      bit 4: APM_BIOS_DISENGAGED
1673	   3) AC line status
1674	      0x00: Off-line
1675	      0x01: On-line
1676	      0x02: On backup power (BIOS >= 1.1 only)
1677	      0xff: Unknown
1678	   4) Battery status
1679	      0x00: High
1680	      0x01: Low
1681	      0x02: Critical
1682	      0x03: Charging
1683	      0x04: Selected battery not present (BIOS >= 1.2 only)
1684	      0xff: Unknown
1685	   5) Battery flag
1686	      bit 0: High
1687	      bit 1: Low
1688	      bit 2: Critical
1689	      bit 3: Charging
1690	      bit 7: No system battery
1691	      0xff: Unknown
1692	   6) Remaining battery life (percentage of charge):
1693	      0-100: valid
1694	      -1: Unknown
1695	   7) Remaining battery life (time units):
1696	      Number of remaining minutes or seconds
1697	      -1: Unknown
1698	   8) min = minutes; sec = seconds */
1699
1700	seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
1701		   driver_version,
1702		   (apm_info.bios.version >> 8) & 0xff,
1703		   apm_info.bios.version & 0xff,
1704		   apm_info.bios.flags,
1705		   ac_line_status,
1706		   battery_status,
1707		   battery_flag,
1708		   percentage,
1709		   time_units,
1710		   units);
1711	return 0;
1712}
1713
1714static int proc_apm_open(struct inode *inode, struct file *file)
1715{
1716	return single_open(file, proc_apm_show, NULL);
1717}
1718
1719static const struct file_operations apm_file_ops = {
1720	.owner		= THIS_MODULE,
1721	.open		= proc_apm_open,
1722	.read		= seq_read,
1723	.llseek		= seq_lseek,
1724	.release	= single_release,
1725};
1726
1727static int apm(void *unused)
1728{
1729	unsigned short	bx;
1730	unsigned short	cx;
1731	unsigned short	dx;
1732	int		error;
1733	char 		*power_stat;
1734	char 		*bat_stat;
1735
1736	/* 2002/08/01 - WT
1737	 * This is to avoid random crashes at boot time during initialization
1738	 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
1739	 * Some bioses don't like being called from CPU != 0.
1740	 * Method suggested by Ingo Molnar.
1741	 */
1742	set_cpus_allowed_ptr(current, cpumask_of(0));
1743	BUG_ON(smp_processor_id() != 0);
1744
1745	if (apm_info.connection_version == 0) {
1746		apm_info.connection_version = apm_info.bios.version;
1747		if (apm_info.connection_version > 0x100) {
1748			/*
1749			 * We only support BIOSs up to version 1.2
1750			 */
1751			if (apm_info.connection_version > 0x0102)
1752				apm_info.connection_version = 0x0102;
1753			error = apm_driver_version(&apm_info.connection_version);
1754			if (error != APM_SUCCESS) {
1755				apm_error("driver version", error);
1756				/* Fall back to an APM 1.0 connection. */
1757				apm_info.connection_version = 0x100;
1758			}
1759		}
1760	}
1761
1762	if (debug)
1763		printk(KERN_INFO "apm: Connection version %d.%d\n",
1764			(apm_info.connection_version >> 8) & 0xff,
1765			apm_info.connection_version & 0xff);
1766
1767#ifdef CONFIG_APM_DO_ENABLE
1768	if (apm_info.bios.flags & APM_BIOS_DISABLED) {
1769		/*
1770		 * This call causes my NEC UltraLite Versa 33/C to hang if it
1771		 * is booted with PM disabled but not in the docking station.
1772		 * Unfortunate ...
1773		 */
1774		error = apm_enable_power_management(1);
1775		if (error) {
1776			apm_error("enable power management", error);
1777			return -1;
1778		}
1779	}
1780#endif
1781
1782	if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
1783	    && (apm_info.connection_version > 0x0100)) {
1784		error = apm_engage_power_management(APM_DEVICE_ALL, 1);
1785		if (error) {
1786			apm_error("engage power management", error);
1787			return -1;
1788		}
1789	}
1790
1791	if (debug && (num_online_cpus() == 1 || smp)) {
1792		error = apm_get_power_status(&bx, &cx, &dx);
1793		if (error)
1794			printk(KERN_INFO "apm: power status not available\n");
1795		else {
1796			switch ((bx >> 8) & 0xff) {
1797			case 0:
1798				power_stat = "off line";
1799				break;
1800			case 1:
1801				power_stat = "on line";
1802				break;
1803			case 2:
1804				power_stat = "on backup power";
1805				break;
1806			default:
1807				power_stat = "unknown";
1808				break;
1809			}
1810			switch (bx & 0xff) {
1811			case 0:
1812				bat_stat = "high";
1813				break;
1814			case 1:
1815				bat_stat = "low";
1816				break;
1817			case 2:
1818				bat_stat = "critical";
1819				break;
1820			case 3:
1821				bat_stat = "charging";
1822				break;
1823			default:
1824				bat_stat = "unknown";
1825				break;
1826			}
1827			printk(KERN_INFO
1828			       "apm: AC %s, battery status %s, battery life ",
1829			       power_stat, bat_stat);
1830			if ((cx & 0xff) == 0xff)
1831				printk("unknown\n");
1832			else
1833				printk("%d%%\n", cx & 0xff);
1834			if (apm_info.connection_version > 0x100) {
1835				printk(KERN_INFO
1836				       "apm: battery flag 0x%02x, battery life ",
1837				       (cx >> 8) & 0xff);
1838				if (dx == 0xffff)
1839					printk("unknown\n");
1840				else
1841					printk("%d %s\n", dx & 0x7fff,
1842					       (dx & 0x8000) ?
1843					       "minutes" : "seconds");
1844			}
1845		}
1846	}
1847
1848	/* Install our power off handler.. */
1849	if (power_off)
1850		pm_power_off = apm_power_off;
1851
1852	if (num_online_cpus() == 1 || smp) {
1853#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1854		console_blank_hook = apm_console_blank;
1855#endif
1856		apm_mainloop();
1857#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
1858		console_blank_hook = NULL;
1859#endif
1860	}
1861
1862	return 0;
1863}
1864
1865#ifndef MODULE
1866static int __init apm_setup(char *str)
1867{
1868	int invert;
1869
1870	while ((str != NULL) && (*str != '\0')) {
1871		if (strncmp(str, "off", 3) == 0)
1872			apm_disabled = 1;
1873		if (strncmp(str, "on", 2) == 0)
1874			apm_disabled = 0;
1875		if ((strncmp(str, "bounce-interval=", 16) == 0) ||
1876		    (strncmp(str, "bounce_interval=", 16) == 0))
1877			bounce_interval = simple_strtol(str + 16, NULL, 0);
1878		if ((strncmp(str, "idle-threshold=", 15) == 0) ||
1879		    (strncmp(str, "idle_threshold=", 15) == 0))
1880			idle_threshold = simple_strtol(str + 15, NULL, 0);
1881		if ((strncmp(str, "idle-period=", 12) == 0) ||
1882		    (strncmp(str, "idle_period=", 12) == 0))
1883			idle_period = simple_strtol(str + 12, NULL, 0);
1884		invert = (strncmp(str, "no-", 3) == 0) ||
1885			(strncmp(str, "no_", 3) == 0);
1886		if (invert)
1887			str += 3;
1888		if (strncmp(str, "debug", 5) == 0)
1889			debug = !invert;
1890		if ((strncmp(str, "power-off", 9) == 0) ||
1891		    (strncmp(str, "power_off", 9) == 0))
1892			power_off = !invert;
1893		if (strncmp(str, "smp", 3) == 0) {
1894			smp = !invert;
1895			idle_threshold = 100;
1896		}
1897		if ((strncmp(str, "allow-ints", 10) == 0) ||
1898		    (strncmp(str, "allow_ints", 10) == 0))
1899			apm_info.allow_ints = !invert;
1900		if ((strncmp(str, "broken-psr", 10) == 0) ||
1901		    (strncmp(str, "broken_psr", 10) == 0))
1902			apm_info.get_power_status_broken = !invert;
1903		if ((strncmp(str, "realmode-power-off", 18) == 0) ||
1904		    (strncmp(str, "realmode_power_off", 18) == 0))
1905			apm_info.realmode_power_off = !invert;
1906		str = strchr(str, ',');
1907		if (str != NULL)
1908			str += strspn(str, ", \t");
1909	}
1910	return 1;
1911}
1912
1913__setup("apm=", apm_setup);
1914#endif
1915
1916static const struct file_operations apm_bios_fops = {
1917	.owner		= THIS_MODULE,
1918	.read		= do_read,
1919	.poll		= do_poll,
1920	.unlocked_ioctl	= do_ioctl,
1921	.open		= do_open,
1922	.release	= do_release,
1923	.llseek		= noop_llseek,
1924};
1925
1926static struct miscdevice apm_device = {
1927	APM_MINOR_DEV,
1928	"apm_bios",
1929	&apm_bios_fops
1930};
1931
1932
1933/* Simple "print if true" callback */
1934static int __init print_if_true(const struct dmi_system_id *d)
1935{
1936	printk("%s\n", d->ident);
1937	return 0;
1938}
1939
1940/*
1941 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
1942 * disabled before the suspend. Linux used to get terribly confused by that.
1943 */
1944static int __init broken_ps2_resume(const struct dmi_system_id *d)
1945{
1946	printk(KERN_INFO "%s machine detected. Mousepad Resume Bug "
1947	       "workaround hopefully not needed.\n", d->ident);
1948	return 0;
1949}
1950
1951/* Some bioses have a broken protected mode poweroff and need to use realmode */
1952static int __init set_realmode_power_off(const struct dmi_system_id *d)
1953{
1954	if (apm_info.realmode_power_off == 0) {
1955		apm_info.realmode_power_off = 1;
1956		printk(KERN_INFO "%s bios detected. "
1957		       "Using realmode poweroff only.\n", d->ident);
1958	}
1959	return 0;
1960}
1961
1962/* Some laptops require interrupts to be enabled during APM calls */
1963static int __init set_apm_ints(const struct dmi_system_id *d)
1964{
1965	if (apm_info.allow_ints == 0) {
1966		apm_info.allow_ints = 1;
1967		printk(KERN_INFO "%s machine detected. "
1968		       "Enabling interrupts during APM calls.\n", d->ident);
1969	}
1970	return 0;
1971}
1972
1973/* Some APM bioses corrupt memory or just plain do not work */
1974static int __init apm_is_horked(const struct dmi_system_id *d)
1975{
1976	if (apm_info.disabled == 0) {
1977		apm_info.disabled = 1;
1978		printk(KERN_INFO "%s machine detected. "
1979		       "Disabling APM.\n", d->ident);
1980	}
1981	return 0;
1982}
1983
1984static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
1985{
1986	if (apm_info.disabled == 0) {
1987		apm_info.disabled = 1;
1988		printk(KERN_INFO "%s machine detected. "
1989		       "Disabling APM.\n", d->ident);
1990		printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
1991		printk(KERN_INFO "download from support.intel.com\n");
1992	}
1993	return 0;
1994}
1995
1996/* Some APM bioses hang on APM idle calls */
1997static int __init apm_likes_to_melt(const struct dmi_system_id *d)
1998{
1999	if (apm_info.forbid_idle == 0) {
2000		apm_info.forbid_idle = 1;
2001		printk(KERN_INFO "%s machine detected. "
2002		       "Disabling APM idle calls.\n", d->ident);
2003	}
2004	return 0;
2005}
2006
2007/*
2008 *  Check for clue free BIOS implementations who use
2009 *  the following QA technique
2010 *
2011 *      [ Write BIOS Code ]<------
2012 *               |                ^
2013 *      < Does it Compile >----N--
2014 *               |Y               ^
2015 *	< Does it Boot Win98 >-N--
2016 *               |Y
2017 *           [Ship It]
2018 *
2019 *	Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
2020 *	Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
2021 */
2022static int __init broken_apm_power(const struct dmi_system_id *d)
2023{
2024	apm_info.get_power_status_broken = 1;
2025	printk(KERN_WARNING "BIOS strings suggest APM bugs, "
2026	       "disabling power status reporting.\n");
2027	return 0;
2028}
2029
2030/*
2031 * This bios swaps the APM minute reporting bytes over (Many sony laptops
2032 * have this problem).
2033 */
2034static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d)
2035{
2036	apm_info.get_power_status_swabinminutes = 1;
2037	printk(KERN_WARNING "BIOS strings suggest APM reports battery life "
2038	       "in minutes and wrong byte order.\n");
2039	return 0;
2040}
2041
2042static struct dmi_system_id __initdata apm_dmi_table[] = {
2043	{
2044		print_if_true,
2045		KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
2046		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
2047			DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
2048	},
2049	{	/* Handle problems with APM on the C600 */
2050		broken_ps2_resume, "Dell Latitude C600",
2051		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
2052			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
2053	},
2054	{	/* Allow interrupts during suspend on Dell Latitude laptops*/
2055		set_apm_ints, "Dell Latitude",
2056		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2057			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
2058	},
2059	{	/* APM crashes */
2060		apm_is_horked, "Dell Inspiron 2500",
2061		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2062			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2063			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2064			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2065	},
2066	{	/* Allow interrupts during suspend on Dell Inspiron laptops*/
2067		set_apm_ints, "Dell Inspiron", {
2068			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2069			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
2070	},
2071	{	/* Handle problems with APM on Inspiron 5000e */
2072		broken_apm_power, "Dell Inspiron 5000e",
2073		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2074			DMI_MATCH(DMI_BIOS_VERSION, "A04"),
2075			DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
2076	},
2077	{	/* Handle problems with APM on Inspiron 2500 */
2078		broken_apm_power, "Dell Inspiron 2500",
2079		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2080			DMI_MATCH(DMI_BIOS_VERSION, "A12"),
2081			DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
2082	},
2083	{	/* APM crashes */
2084		apm_is_horked, "Dell Dimension 4100",
2085		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2086			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
2087			DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2088			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2089	},
2090	{	/* Allow interrupts during suspend on Compaq Laptops*/
2091		set_apm_ints, "Compaq 12XL125",
2092		{	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
2093			DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
2094			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2095			DMI_MATCH(DMI_BIOS_VERSION, "4.06"), },
2096	},
2097	{	/* Allow interrupts during APM or the clock goes slow */
2098		set_apm_ints, "ASUSTeK",
2099		{	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
2100			DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
2101	},
2102	{	/* APM blows on shutdown */
2103		apm_is_horked, "ABIT KX7-333[R]",
2104		{	DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
2105			DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
2106	},
2107	{	/* APM crashes */
2108		apm_is_horked, "Trigem Delhi3",
2109		{	DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
2110			DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
2111	},
2112	{	/* APM crashes */
2113		apm_is_horked, "Fujitsu-Siemens",
2114		{	DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
2115			DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
2116	},
2117	{	/* APM crashes */
2118		apm_is_horked_d850md, "Intel D850MD",
2119		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2120			DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
2121	},
2122	{	/* APM crashes */
2123		apm_is_horked, "Intel D810EMO",
2124		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2125			DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
2126	},
2127	{	/* APM crashes */
2128		apm_is_horked, "Dell XPS-Z",
2129		{	DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
2130			DMI_MATCH(DMI_BIOS_VERSION, "A11"),
2131			DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
2132	},
2133	{	/* APM crashes */
2134		apm_is_horked, "Sharp PC-PJ/AX",
2135		{	DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
2136			DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
2137			DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"),
2138			DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), },
2139	},
2140	{	/* APM crashes */
2141		apm_is_horked, "Dell Inspiron 2500",
2142		{	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
2143			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
2144			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2145			DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
2146	},
2147	{	/* APM idle hangs */
2148		apm_likes_to_melt, "Jabil AMD",
2149		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2150			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
2151	},
2152	{	/* APM idle hangs */
2153		apm_likes_to_melt, "AMI Bios",
2154		{	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
2155			DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
2156	},
2157	{	/* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
2158		swab_apm_power_in_minutes, "Sony VAIO",
2159		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2160			DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
2161			DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
2162	},
2163	{	/* Handle problems with APM on Sony Vaio PCG-N505VX */
2164		swab_apm_power_in_minutes, "Sony VAIO",
2165		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2166			DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
2167			DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
2168	},
2169	{	/* Handle problems with APM on Sony Vaio PCG-XG29 */
2170		swab_apm_power_in_minutes, "Sony VAIO",
2171		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2172			DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
2173			DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
2174	},
2175	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2176		swab_apm_power_in_minutes, "Sony VAIO",
2177		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2178			DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
2179			DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
2180	},
2181	{	/* Handle problems with APM on Sony Vaio PCG-Z600NE */
2182		swab_apm_power_in_minutes, "Sony VAIO",
2183		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2184			DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
2185			DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
2186	},
2187	{	/* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
2188		swab_apm_power_in_minutes, "Sony VAIO",
2189		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2190			DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
2191			DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
2192	},
2193	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2194		swab_apm_power_in_minutes, "Sony VAIO",
2195		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2196			DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
2197			DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
2198	},
2199	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS */
2200		swab_apm_power_in_minutes, "Sony VAIO",
2201		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2202			DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
2203			DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
2204	},
2205	{	/* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
2206		swab_apm_power_in_minutes, "Sony VAIO",
2207		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2208			DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
2209			DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
2210	},
2211	{	/* Handle problems with APM on Sony Vaio PCG-F104K */
2212		swab_apm_power_in_minutes, "Sony VAIO",
2213		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2214			DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
2215			DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
2216	},
2217
2218	{	/* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
2219		swab_apm_power_in_minutes, "Sony VAIO",
2220		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2221			DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
2222			DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
2223	},
2224	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2225		swab_apm_power_in_minutes, "Sony VAIO",
2226		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2227			DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
2228			DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
2229	},
2230	{	/* Handle problems with APM on Sony Vaio PCG-C1VE */
2231		swab_apm_power_in_minutes, "Sony VAIO",
2232		{	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
2233			DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
2234			DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
2235	},
2236	{	/* broken PM poweroff bios */
2237		set_realmode_power_off, "Award Software v4.60 PGMA",
2238		{	DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
2239			DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
2240			DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
2241	},
2242
2243	/* Generic per vendor APM settings  */
2244
2245	{	/* Allow interrupts during suspend on IBM laptops */
2246		set_apm_ints, "IBM",
2247		{	DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
2248	},
2249
2250	{ }
2251};
2252
2253/*
2254 * Just start the APM thread. We do NOT want to do APM BIOS
2255 * calls from anything but the APM thread, if for no other reason
2256 * than the fact that we don't trust the APM BIOS. This way,
2257 * most common APM BIOS problems that lead to protection errors
2258 * etc will have at least some level of being contained...
2259 *
2260 * In short, if something bad happens, at least we have a choice
2261 * of just killing the apm thread..
2262 */
2263static int __init apm_init(void)
2264{
2265	struct desc_struct *gdt;
2266	int err;
2267
2268	dmi_check_system(apm_dmi_table);
2269
2270	if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) {
2271		printk(KERN_INFO "apm: BIOS not found.\n");
2272		return -ENODEV;
2273	}
2274	printk(KERN_INFO
2275	       "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
2276	       ((apm_info.bios.version >> 8) & 0xff),
2277	       (apm_info.bios.version & 0xff),
2278	       apm_info.bios.flags,
2279	       driver_version);
2280	if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
2281		printk(KERN_INFO "apm: no 32 bit BIOS support\n");
2282		return -ENODEV;
2283	}
2284
2285	if (allow_ints)
2286		apm_info.allow_ints = 1;
2287	if (broken_psr)
2288		apm_info.get_power_status_broken = 1;
2289	if (realmode_power_off)
2290		apm_info.realmode_power_off = 1;
2291	/* User can override, but default is to trust DMI */
2292	if (apm_disabled != -1)
2293		apm_info.disabled = apm_disabled;
2294
2295	/*
2296	 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
2297	 * but is reportedly a 1.0 BIOS.
2298	 */
2299	if (apm_info.bios.version == 0x001)
2300		apm_info.bios.version = 0x100;
2301
2302	/* BIOS < 1.2 doesn't set cseg_16_len */
2303	if (apm_info.bios.version < 0x102)
2304		apm_info.bios.cseg_16_len = 0; /* 64k */
2305
2306	if (debug) {
2307		printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
2308			apm_info.bios.cseg, apm_info.bios.offset,
2309			apm_info.bios.cseg_16, apm_info.bios.dseg);
2310		if (apm_info.bios.version > 0x100)
2311			printk(" cseg len %x, dseg len %x",
2312				apm_info.bios.cseg_len,
2313				apm_info.bios.dseg_len);
2314		if (apm_info.bios.version > 0x101)
2315			printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
2316		printk("\n");
2317	}
2318
2319	if (apm_info.disabled) {
2320		printk(KERN_NOTICE "apm: disabled on user request.\n");
2321		return -ENODEV;
2322	}
2323	if ((num_online_cpus() > 1) && !power_off && !smp) {
2324		printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
2325		apm_info.disabled = 1;
2326		return -ENODEV;
2327	}
2328	if (!acpi_disabled) {
2329		printk(KERN_NOTICE "apm: overridden by ACPI.\n");
2330		apm_info.disabled = 1;
2331		return -ENODEV;
2332	}
2333
2334	/*
2335	 * Set up the long jump entry point to the APM BIOS, which is called
2336	 * from inline assembly.
2337	 */
2338	apm_bios_entry.offset = apm_info.bios.offset;
2339	apm_bios_entry.segment = APM_CS;
2340
2341	/*
2342	 * The APM 1.1 BIOS is supposed to provide limit information that it
2343	 * recognizes.  Many machines do this correctly, but many others do
2344	 * not restrict themselves to their claimed limit.  When this happens,
2345	 * they will cause a segmentation violation in the kernel at boot time.
2346	 * Most BIOS's, however, will respect a 64k limit, so we use that.
2347	 *
2348	 * Note we only set APM segments on CPU zero, since we pin the APM
2349	 * code to that CPU.
2350	 */
2351	gdt = get_cpu_gdt_table(0);
2352	set_desc_base(&gdt[APM_CS >> 3],
2353		 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
2354	set_desc_base(&gdt[APM_CS_16 >> 3],
2355		 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
2356	set_desc_base(&gdt[APM_DS >> 3],
2357		 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
2358
2359	proc_create("apm", 0, NULL, &apm_file_ops);
2360
2361	kapmd_task = kthread_create(apm, NULL, "kapmd");
2362	if (IS_ERR(kapmd_task)) {
2363		printk(KERN_ERR "apm: disabled - Unable to start kernel "
2364				"thread.\n");
2365		err = PTR_ERR(kapmd_task);
2366		kapmd_task = NULL;
2367		remove_proc_entry("apm", NULL);
2368		return err;
2369	}
2370	wake_up_process(kapmd_task);
2371
2372	if (num_online_cpus() > 1 && !smp) {
2373		printk(KERN_NOTICE
2374		       "apm: disabled - APM is not SMP safe (power off active).\n");
2375		return 0;
2376	}
2377
2378	/*
2379	 * Note we don't actually care if the misc_device cannot be registered.
2380	 * this driver can do its job without it, even if userspace can't
2381	 * control it.  just log the error
2382	 */
2383	if (misc_register(&apm_device))
2384		printk(KERN_WARNING "apm: Could not register misc device.\n");
2385
2386	if (HZ != 100)
2387		idle_period = (idle_period * HZ) / 100;
2388	if (idle_threshold < 100) {
2389		original_pm_idle = pm_idle;
2390		pm_idle  = apm_cpu_idle;
2391		set_pm_idle = 1;
 
2392	}
2393
2394	return 0;
2395}
2396
2397static void __exit apm_exit(void)
2398{
2399	int error;
2400
2401	if (set_pm_idle) {
2402		pm_idle = original_pm_idle;
2403		/*
2404		 * We are about to unload the current idle thread pm callback
2405		 * (pm_idle), Wait for all processors to update cached/local
2406		 * copies of pm_idle before proceeding.
2407		 */
2408		cpu_idle_wait();
2409	}
2410	if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
2411	    && (apm_info.connection_version > 0x0100)) {
2412		error = apm_engage_power_management(APM_DEVICE_ALL, 0);
2413		if (error)
2414			apm_error("disengage power management", error);
2415	}
2416	misc_deregister(&apm_device);
2417	remove_proc_entry("apm", NULL);
2418	if (power_off)
2419		pm_power_off = NULL;
2420	if (kapmd_task) {
2421		kthread_stop(kapmd_task);
2422		kapmd_task = NULL;
2423	}
2424}
2425
2426module_init(apm_init);
2427module_exit(apm_exit);
2428
2429MODULE_AUTHOR("Stephen Rothwell");
2430MODULE_DESCRIPTION("Advanced Power Management");
2431MODULE_LICENSE("GPL");
2432module_param(debug, bool, 0644);
2433MODULE_PARM_DESC(debug, "Enable debug mode");
2434module_param(power_off, bool, 0444);
2435MODULE_PARM_DESC(power_off, "Enable power off");
2436module_param(bounce_interval, int, 0444);
2437MODULE_PARM_DESC(bounce_interval,
2438		"Set the number of ticks to ignore suspend bounces");
2439module_param(allow_ints, bool, 0444);
2440MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
2441module_param(broken_psr, bool, 0444);
2442MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
2443module_param(realmode_power_off, bool, 0444);
2444MODULE_PARM_DESC(realmode_power_off,
2445		"Switch to real mode before powering off");
2446module_param(idle_threshold, int, 0444);
2447MODULE_PARM_DESC(idle_threshold,
2448	"System idle percentage above which to make APM BIOS idle calls");
2449module_param(idle_period, int, 0444);
2450MODULE_PARM_DESC(idle_period,
2451	"Period (in sec/100) over which to caculate the idle percentage");
2452module_param(smp, bool, 0444);
2453MODULE_PARM_DESC(smp,
2454	"Set this to enable APM use on an SMP platform. Use with caution on older systems");
2455MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);